Imported Upstream version 0.7.91upstream/0.7.91upstream

80 files changed, 3915 insertions, 7447 deletions

diff --git a/sysdeps/Makefile.in b/sysdeps/Makefile.in
deleted file mode 100644
index d072917..0000000
--- a/sysdeps/Makefile.in
+++ /dev/null
@@ -1,602 +0,0 @@
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diff --git a/sysdeps/linux-gnu/Makefile.am b/sysdeps/linux-gnu/Makefile.am
index bfa67d6..ecee577 100644
--- a/sysdeps/linux-gnu/Makefile.am
+++ b/sysdeps/linux-gnu/Makefile.am
@@ -16,7 +16,7 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA
 
-DIST_SUBDIRS = alpha arm cris ia64 m68k mipsel ppc s390 sparc x86
+DIST_SUBDIRS = alpha arm cris ia64 m68k metag mips ppc s390 sparc x86
 
 SUBDIRS = \
 	$(HOST_CPU)
@@ -24,11 +24,7 @@ SUBDIRS = \
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 	../libos.la
 
-___libos_la_SOURCES = \
-	events.c \
-	trace.c \
-	proc.c \
-	breakpoint.c
+___libos_la_SOURCES = events.c trace.c proc.c breakpoint.c hooks.c
 
 ___libos_la_LIBADD = \
 	libcpu.la
diff --git a/sysdeps/linux-gnu/Makefile.in b/sysdeps/linux-gnu/Makefile.in
deleted file mode 100644
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-	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
-	  done | \
-	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
-	      END { if (nonempty) { for (i in files) print i; }; }'`; \
-	mkid -fID $$unique
-tags: TAGS
-
-TAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
-		$(TAGS_FILES) $(LISP)
-	set x; \
-	here=`pwd`; \
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
-	unique=`for i in $$list; do \
-	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
-	  done | \
-	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
-	      END { if (nonempty) { for (i in files) print i; }; }'`; \
-	shift; \
-	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
-	  test -n "$$unique" || unique=$$empty_fix; \
-	  if test $$# -gt 0; then \
-	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
-	      "$$@" $$unique; \
-	  else \
-	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
-	      $$unique; \
-	  fi; \
-	fi
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-CTAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
-		$(TAGS_FILES) $(LISP)
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
-	unique=`for i in $$list; do \
-	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
-	  done | \
-	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
-	      END { if (nonempty) { for (i in files) print i; }; }'`; \
-	test -z "$(CTAGS_ARGS)$$unique" \
-	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
-	     $$unique
-
-GTAGS:
-	here=`$(am__cd) $(top_builddir) && pwd` \
-	  && $(am__cd) $(top_srcdir) \
-	  && gtags -i $(GTAGS_ARGS) "$$here"
-
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-	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
-
-distdir: $(DISTFILES)
-	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
-	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
-	list='$(DISTFILES)'; \
-	  dist_files=`for file in $$list; do echo $$file; done | \
-	  sed -e "s|^$$srcdirstrip/||;t" \
-	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
-	case $$dist_files in \
-	  */*) $(MKDIR_P) `echo "$$dist_files" | \
-			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
-			   sort -u` ;; \
-	esac; \
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-	    fi; \
-	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
-	  else \
-	    test -f "$(distdir)/$$file" \
-	    || cp -p $$d/$$file "$(distdir)/$$file" \
-	    || exit 1; \
-	  fi; \
-	done
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diff --git a/sysdeps/linux-gnu/alpha/plt.c b/sysdeps/linux-gnu/alpha/plt.c
index c7ce9fe..1185363 100644
--- a/sysdeps/linux-gnu/alpha/plt.c
+++ b/sysdeps/linux-gnu/alpha/plt.c
@@ -23,11 +23,13 @@
 #include "common.h"
 
 GElf_Addr
-arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela) {
+arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela *rela)
+{
 	return lte->plt_addr + ndx * 12 + 32;
 }
 
 void *
-sym2addr(Process *proc, struct library_symbol *sym) {
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
 	return sym->enter_addr;
 }
diff --git a/sysdeps/linux-gnu/alpha/regs.c b/sysdeps/linux-gnu/alpha/regs.c
index 0b46afd..9ccd8f2 100644
--- a/sysdeps/linux-gnu/alpha/regs.c
+++ b/sysdeps/linux-gnu/alpha/regs.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2004,2008,2009 Juan Cespedes
  *
  * This program is free software; you can redistribute it and/or
@@ -36,26 +37,25 @@
 #endif
 
 void *
-get_instruction_pointer(Process *proc) {
+get_instruction_pointer(struct process *proc)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 64 /* REG_PC */ , 0);
 }
 
 void
-set_instruction_pointer(Process *proc, void *addr) {
+set_instruction_pointer(struct process *proc, void *addr)
+{
 	ptrace(PTRACE_POKEUSER, proc->pid, 64 /* REG_PC */ , addr);
 }
 
 void *
-get_stack_pointer(Process *proc) {
+get_stack_pointer(struct process *proc)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 30 /* REG_FP */ , 0);
 }
 
 void *
-get_return_addr(Process *proc, void *stack_pointer) {
+get_return_addr(struct process *proc, void *stack_pointer)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 26 /* RA */ , 0);
 }
-
-void
-set_return_addr(Process *proc, void *addr) {
-	ptrace(PTRACE_POKEUSER, proc->pid, 26 /* RA */ , addr);
-}
diff --git a/sysdeps/linux-gnu/alpha/trace.c b/sysdeps/linux-gnu/alpha/trace.c
index a7c5e59..c6f7494 100644
--- a/sysdeps/linux-gnu/alpha/trace.c
+++ b/sysdeps/linux-gnu/alpha/trace.c
@@ -40,13 +40,15 @@
 #endif
 
 void
-get_arch_dep(Process *proc) {
+get_arch_dep(struct process *proc)
+{
 }
 
 /* Returns 1 if syscall, 2 if sysret, 0 otherwise.
  */
 int
-syscall_p(Process *proc, int status, int *sysnum) {
+syscall_p(struct process *proc, int status, int *sysnum)
+{
 	if (WIFSTOPPED(status)
 	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
 		char *ip = get_instruction_pointer(proc) - 4;
@@ -69,7 +71,8 @@ syscall_p(Process *proc, int status, int *sysnum) {
 }
 
 long
-gimme_arg(enum tof type, Process *proc, int arg_num, struct arg_type_info *info)
+gimme_arg(enum tof type, struct process *proc, int arg_num,
+	  struct arg_type_info *info)
 {
 	if (arg_num == -1) {	/* return value */
 		return ptrace(PTRACE_PEEKUSER, proc->pid, 0 /* REG_R0 */ , 0);
diff --git a/sysdeps/linux-gnu/arm/Makefile.am b/sysdeps/linux-gnu/arm/Makefile.am
index 385424c..2c180c6 100644
--- a/sysdeps/linux-gnu/arm/Makefile.am
+++ b/sysdeps/linux-gnu/arm/Makefile.am
@@ -1,4 +1,5 @@
 # This file is part of ltrace.
+# Copyright (C) 2013 Petr Machata, Red Hat Inc.
 # Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
 #
 # This program is free software; you can redistribute it and/or
@@ -16,21 +17,11 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA
 
-noinst_LTLIBRARIES = \
-	../libcpu.la
+noinst_LTLIBRARIES = ../libcpu.la
 
-___libcpu_la_SOURCES = \
-	breakpoint.c \
-	plt.c \
-	regs.c \
-	trace.c
+___libcpu_la_SOURCES = breakpoint.c fetch.c plt.c regs.c trace.c
 
-noinst_HEADERS = \
-	arch.h \
-	arch_syscallent.h \
-	ptrace.h \
-	signalent.h \
-	syscallent.h
+noinst_HEADERS = arch.h arch_syscallent.h ptrace.h regs.h signalent.h	\
+	 syscallent.h
 
-MAINTAINERCLEANFILES = \
-	Makefile.in
+MAINTAINERCLEANFILES = Makefile.in
diff --git a/sysdeps/linux-gnu/arm/Makefile.in b/sysdeps/linux-gnu/arm/Makefile.in
deleted file mode 100644
index ad6475d..0000000
--- a/sysdeps/linux-gnu/arm/Makefile.in
+++ /dev/null
@@ -1,531 +0,0 @@
-# Makefile.in generated by automake 1.11.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# This file is part of ltrace.
-# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-# 02110-1301 USA
-
-
-VPATH = @srcdir@
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-am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
-install_sh_DATA = $(install_sh) -c -m 644
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-INSTALL_HEADER = $(INSTALL_DATA)
-transform = $(program_transform_name)
-NORMAL_INSTALL = :
-PRE_INSTALL = :
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-host_triplet = @host@
-subdir = sysdeps/linux-gnu/arm
-DIST_COMMON = $(noinst_HEADERS) $(srcdir)/Makefile.am \
-	$(srcdir)/Makefile.in
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-am__aclocal_m4_deps = $(top_srcdir)/config/m4/libtool.m4 \
-	$(top_srcdir)/config/m4/ltoptions.m4 \
-	$(top_srcdir)/config/m4/ltsugar.m4 \
-	$(top_srcdir)/config/m4/ltversion.m4 \
-	$(top_srcdir)/config/m4/lt~obsolete.m4 \
-	$(top_srcdir)/configure.ac
-am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
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-am__dirstamp = $(am__leading_dot)dirstamp
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-am__depfiles_maybe = depfiles
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-COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
-	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
-LTCOMPILE = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
-	--mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
-	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
-CCLD = $(CC)
-LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
-	--mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
-	$(LDFLAGS) -o $@
-SOURCES = $(___libcpu_la_SOURCES)
-DIST_SOURCES = $(___libcpu_la_SOURCES)
-HEADERS = $(noinst_HEADERS)
-ETAGS = etags
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-DUMPBIN = @DUMPBIN@
-ECHO_C = @ECHO_C@
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-EGREP = @EGREP@
-EXEEXT = @EXEEXT@
-FGREP = @FGREP@
-GREP = @GREP@
-HAVE_VALGRIND = @HAVE_VALGRIND@
-HOST_CPU = @HOST_CPU@
-HOST_OS = @HOST_OS@
-INSTALL = @INSTALL@
-INSTALL_DATA = @INSTALL_DATA@
-INSTALL_PROGRAM = @INSTALL_PROGRAM@
-INSTALL_SCRIPT = @INSTALL_SCRIPT@
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-	../libcpu.la
-
-___libcpu_la_SOURCES = \
-	breakpoint.c \
-	plt.c \
-	regs.c \
-	trace.c
-
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-	arch_syscallent.h \
-	ptrace.h \
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-	syscallent.h
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-	@for dep in $?; do \
-	  case '$(am__configure_deps)' in \
-	    *$$dep*) \
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-	        && { if test -f $@; then exit 0; else break; fi; }; \
-	      exit 1;; \
-	  esac; \
-	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign sysdeps/linux-gnu/arm/Makefile'; \
-	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --foreign sysdeps/linux-gnu/arm/Makefile
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-	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
-	esac;
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-	  test "$$dir" != "$$p" || dir=.; \
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-	  rm -f "$${dir}/so_locations"; \
-	done
-../$(am__dirstamp):
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-../libcpu.la: $(___libcpu_la_OBJECTS) $(___libcpu_la_DEPENDENCIES) ../$(am__dirstamp)
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-	mkid -fID $$unique
-tags: TAGS
-
-TAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
-		$(TAGS_FILES) $(LISP)
-	set x; \
-	here=`pwd`; \
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
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-	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
-	     $$unique
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-	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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-	    || cp -p $$d/$$file "$(distdir)/$$file" \
-	    || exit 1; \
-	  fi; \
-	done
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-	-rm -f ../$(am__dirstamp)
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-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
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diff --git a/sysdeps/linux-gnu/arm/arch.h b/sysdeps/linux-gnu/arm/arch.h
index 291443a..58a7fdf 100644
--- a/sysdeps/linux-gnu/arm/arch.h
+++ b/sysdeps/linux-gnu/arm/arch.h
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 1998,2004,2008 Juan Cespedes
  *
  * This program is free software; you can redistribute it and/or
@@ -18,6 +19,9 @@
  * 02110-1301 USA
  */
 
+#ifndef LTRACE_ARM_ARCH_H
+#define LTRACE_ARM_ARCH_H
+
 #define ARCH_HAVE_ENABLE_BREAKPOINT 1
 #define ARCH_HAVE_DISABLE_BREAKPOINT 1
 
@@ -31,7 +35,24 @@
 #define LT_ELFCLASS	ELFCLASS32
 #define LT_ELF_MACHINE	EM_ARM
 
+#define ARCH_HAVE_SW_SINGLESTEP
+#define ARCH_HAVE_FETCH_ARG
+#define ARCH_HAVE_FETCH_PACK
+#define ARCH_HAVE_SIZEOF
+#define ARCH_HAVE_ALIGNOF
 #define ARCH_HAVE_BREAKPOINT_DATA
 struct arch_breakpoint_data {
 	int thumb_mode;
 };
+
+#define ARCH_HAVE_LTELF_DATA
+struct arch_ltelf_data {
+	/* We have this only for the hooks.  */
+};
+
+#define ARCH_HAVE_LIBRARY_DATA
+struct arch_library_data {
+	unsigned int hardfp:1;
+};
+
+#endif /* LTRACE_ARM_ARCH_H */
diff --git a/sysdeps/linux-gnu/arm/breakpoint.c b/sysdeps/linux-gnu/arm/breakpoint.c
index 5748401..fcd43a7 100644
--- a/sysdeps/linux-gnu/arm/breakpoint.c
+++ b/sysdeps/linux-gnu/arm/breakpoint.c
@@ -92,16 +92,13 @@ arch_disable_breakpoint(pid_t pid, const struct breakpoint *sbp)
 }
 
 int
-arch_breakpoint_init(struct Process *proc, struct breakpoint *sbp)
+arch_breakpoint_init(struct process *proc, struct breakpoint *sbp)
 {
-	/* XXX That uintptr_t cast is there temporarily until
-	 * arch_addr_t becomes integral type.  */
-	int thumb_mode = ((uintptr_t)sbp->addr) & 1;
-	if (thumb_mode)
-		sbp->addr = (void *)((uintptr_t)sbp->addr & ~1);
-	sbp->arch.thumb_mode = thumb_mode | proc->thumb_mode;
-	/* XXX This doesn't seem like it belongs here.  */
-	proc->thumb_mode = 0;
+	/* XXX double cast  */
+	sbp->arch.thumb_mode = ((uintptr_t)sbp->addr) & 1;
+	if (sbp->arch.thumb_mode)
+		/* XXX double cast */
+		sbp->addr = (arch_addr_t)((uintptr_t)sbp->addr & ~1);
 	return 0;
 }
 
diff --git a/sysdeps/linux-gnu/arm/fetch.c b/sysdeps/linux-gnu/arm/fetch.c
new file mode 100644
index 0000000..5081d78
--- /dev/null
+++ b/sysdeps/linux-gnu/arm/fetch.c
@@ -0,0 +1,531 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <sys/ptrace.h>
+#include <asm/ptrace.h>
+#include <assert.h>
+#include <elf.h>
+#include <libelf.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "backend.h"
+#include "fetch.h"
+#include "library.h"
+#include "ltrace-elf.h"
+#include "proc.h"
+#include "ptrace.h"
+#include "regs.h"
+#include "type.h"
+#include "value.h"
+
+static int
+get_hardfp(uint64_t abi_vfp_args)
+{
+	if (abi_vfp_args == 2)
+		fprintf(stderr,
+			"Tag_ABI_VFP_args value 2 (tool chain-specific "
+			"conventions) not supported.\n");
+	return abi_vfp_args == 1;
+}
+
+int
+arch_elf_init(struct ltelf *lte, struct library *lib)
+{
+	/* Nothing in this section is strictly critical.  It's not
+	 * that much of a deal if we fail to guess right whether the
+	 * ABI is softfp or hardfp.  */
+	unsigned hardfp = 0;
+
+	Elf_Scn *scn;
+	Elf_Data *data;
+	GElf_Shdr shdr;
+	if (elf_get_section_type(lte, SHT_ARM_ATTRIBUTES, &scn, &shdr) < 0
+	    || (scn != NULL && (data = elf_loaddata(scn, &shdr)) == NULL)) {
+		fprintf(stderr,
+			"Error when obtaining ARM attribute section: %s\n",
+			elf_errmsg(-1));
+		goto done;
+
+	} else if (scn != NULL && data != NULL) {
+		GElf_Xword offset = 0;
+		uint8_t version;
+		if (elf_read_next_u8(data, &offset, &version) < 0) {
+			goto done;
+		} else if (version != 'A') {
+			fprintf(stderr, "Unsupported ARM attribute section "
+				"version %d ('%c').\n", version, version);
+			goto done;
+		}
+
+		do {
+			const char signature[] = "aeabi";
+			/* N.B. LEN is including the length field
+			 * itself.  */
+			uint32_t sec_len;
+			if (elf_read_u32(data, offset, &sec_len) < 0
+			    || !elf_can_read_next(data, offset, sec_len)) {
+				goto done;
+			}
+			const GElf_Xword next_offset = offset + sec_len;
+			offset += 4;
+
+			if (sec_len < 4 + sizeof signature
+			    || strcmp(signature, data->d_buf + offset) != 0)
+				goto skip;
+			offset += sizeof signature;
+
+			const GElf_Xword offset0 = offset;
+			uint64_t tag;
+			uint32_t sub_len;
+			if (elf_read_next_uleb128(data, &offset, &tag) < 0
+			    || elf_read_next_u32(data, &offset, &sub_len) < 0
+			    || !elf_can_read_next(data, offset0, sub_len))
+				goto done;
+
+			if (tag != 1)
+				/* IHI0045D_ABI_addenda: "section and
+				 * symbol attributes are deprecated
+				 * [...] consumers are permitted to
+				 * ignore them."  */
+				goto skip;
+
+			while (offset < offset0 + sub_len) {
+				if (elf_read_next_uleb128(data,
+							  &offset, &tag) < 0)
+					goto done;
+
+				switch (tag) {
+					uint64_t v;
+				case 6: /* Tag_CPU_arch */
+				case 7: /* Tag_CPU_arch_profile */
+				case 8: /* Tag_ARM_ISA_use */
+				case 9: /* Tag_THUMB_ISA_use */
+				case 10: /* Tag_FP_arch */
+				case 11: /* Tag_WMMX_arch */
+				case 12: /* Tag_Advanced_SIMD_arch */
+				case 13: /* Tag_PCS_config */
+				case 14: /* Tag_ABI_PCS_R9_use */
+				case 15: /* Tag_ABI_PCS_RW_data */
+				case 16: /* Tag_ABI_PCS_RO_data */
+				case 17: /* Tag_ABI_PCS_GOT_use */
+				case 18: /* Tag_ABI_PCS_wchar_t */
+				case 19: /* Tag_ABI_FP_rounding */
+				case 20: /* Tag_ABI_FP_denormal */
+				case 21: /* Tag_ABI_FP_exceptions */
+				case 22: /* Tag_ABI_FP_user_exceptions */
+				case 23: /* Tag_ABI_FP_number_model */
+				case 24: /* Tag_ABI_align_needed */
+				case 25: /* Tag_ABI_align_preserved */
+				case 26: /* Tag_ABI_enum_size */
+				case 27: /* Tag_ABI_HardFP_use */
+				case 28: /* Tag_ABI_VFP_args */
+				case 29: /* Tag_ABI_WMMX_args */
+				case 30: /* Tag_ABI_optimization_goals */
+				case 31: /* Tag_ABI_FP_optimization_goals */
+				case 32: /* Tag_compatibility */
+				case 34: /* Tag_CPU_unaligned_access */
+				case 36: /* Tag_FP_HP_extension */
+				case 38: /* Tag_ABI_FP_16bit_format */
+				case 42: /* Tag_MPextension_use */
+				case 70: /* Tag_MPextension_use as well */
+				case 44: /* Tag_DIV_use */
+				case 64: /* Tag_nodefaults */
+				case 66: /* Tag_T2EE_use */
+				case 68: /* Tag_Virtualization_use */
+				uleb128:
+					if (elf_read_next_uleb128
+						(data, &offset, &v) < 0)
+						goto done;
+					if (tag == 28)
+						hardfp = get_hardfp(v);
+					if (tag != 32)
+						continue;
+
+					/* Tag 32 has two arguments,
+					 * fall through.  */
+
+				case 4:	/* Tag_CPU_raw_name */
+				case 5:	/* Tag_CPU_name */
+				case 65: /* Tag_also_compatible_with */
+				case 67: /* Tag_conformance */
+				ntbs:
+					offset += strlen(data->d_buf
+							 + offset) + 1;
+					continue;
+				}
+
+				/* Handle unknown tags in a generic
+				 * manner, if possible.  */
+				if (tag <= 32) {
+					fprintf(stderr,
+						"Unknown tag %lld "
+						"at offset %#llx "
+						"of ARM attribute section.",
+						tag, offset);
+					goto skip;
+				} else if (tag % 2 == 0) {
+					goto uleb128;
+				} else {
+					goto ntbs;
+				}
+			}
+
+		skip:
+			offset = next_offset;
+
+		} while (elf_can_read_next(data, offset, 1));
+
+	}
+
+done:
+	lib->arch.hardfp = hardfp;
+	return 0;
+}
+
+void
+arch_elf_destroy(struct ltelf *lte)
+{
+}
+
+int
+arch_library_init(struct library *lib)
+{
+	return 0;
+}
+
+void
+arch_library_destroy(struct library *lib)
+{
+}
+
+int
+arch_library_clone(struct library *retp, struct library *lib)
+{
+	retp->arch = lib->arch;
+	return 0;
+}
+
+enum {
+	/* How many (double) VFP registers the AAPCS uses for
+	 * parameter passing.  */
+	NUM_VFP_REGS = 8,
+};
+
+struct fetch_context {
+	struct pt_regs regs;
+
+	struct {
+		union {
+			double d[32];
+			float s[64];
+		};
+		uint32_t fpscr;
+	} fpregs;
+
+	/* VFP register allocation.  ALLOC.S tracks whether the
+	 * corresponding FPREGS.S register is taken, ALLOC.D the same
+	 * for FPREGS.D.  We only track 8 (16) registers, because
+	 * that's what the ABI uses for parameter passing.  */
+	union {
+		int16_t d[NUM_VFP_REGS];
+		int8_t s[NUM_VFP_REGS * 2];
+	} alloc;
+
+	unsigned ncrn;
+	arch_addr_t sp;
+	arch_addr_t nsaa;
+	arch_addr_t ret_struct;
+
+	bool hardfp:1;
+	bool in_varargs:1;
+};
+
+static int
+fetch_register_banks(struct process *proc, struct fetch_context *context)
+{
+	if (ptrace(PTRACE_GETREGS, proc->pid, NULL, &context->regs) == -1)
+		return -1;
+
+	if (context->hardfp
+	    && ptrace(PTRACE_GETVFPREGS, proc->pid,
+		      NULL, &context->fpregs) == -1)
+		return -1;
+
+	context->ncrn = 0;
+	context->nsaa = context->sp = get_stack_pointer(proc);
+	memset(&context->alloc, 0, sizeof(context->alloc));
+
+	return 0;
+}
+
+struct fetch_context *
+arch_fetch_arg_init(enum tof type, struct process *proc,
+		    struct arg_type_info *ret_info)
+{
+	struct fetch_context *context = malloc(sizeof(*context));
+
+	{
+		struct process *mainp = proc;
+		while (mainp->libraries == NULL && mainp->parent != NULL)
+			mainp = mainp->parent;
+		context->hardfp = mainp->libraries->arch.hardfp;
+	}
+
+	if (context == NULL
+	    || fetch_register_banks(proc, context) < 0) {
+		free(context);
+		return NULL;
+	}
+
+	if (ret_info->type == ARGTYPE_STRUCT
+	    || ret_info->type == ARGTYPE_ARRAY) {
+		size_t sz = type_sizeof(proc, ret_info);
+		assert(sz != (size_t)-1);
+		if (sz > 4) {
+			/* XXX double cast */
+			context->ret_struct
+				= (arch_addr_t)context->regs.uregs[0];
+			context->ncrn++;
+		}
+	}
+
+	return context;
+}
+
+struct fetch_context *
+arch_fetch_arg_clone(struct process *proc,
+		     struct fetch_context *context)
+{
+	struct fetch_context *clone = malloc(sizeof(*context));
+	if (clone == NULL)
+		return NULL;
+	*clone = *context;
+	return clone;
+}
+
+/* 0 is success, 1 is failure, negative value is an error.  */
+static int
+pass_in_vfp(struct fetch_context *ctx, struct process *proc,
+	    enum arg_type type, size_t count, struct value *valuep)
+{
+	assert(type == ARGTYPE_FLOAT || type == ARGTYPE_DOUBLE);
+	unsigned max = type == ARGTYPE_DOUBLE ? NUM_VFP_REGS : 2 * NUM_VFP_REGS;
+	if (count > max)
+		return 1;
+
+	size_t i;
+	size_t j;
+	for (i = 0; i < max; ++i) {
+		for (j = i; j < i + count; ++j)
+			if ((type == ARGTYPE_DOUBLE && ctx->alloc.d[j] != 0)
+			    || (type == ARGTYPE_FLOAT && ctx->alloc.s[j] != 0))
+				goto next;
+
+		/* Found COUNT consecutive unallocated registers at I.  */
+		const size_t sz = (type == ARGTYPE_FLOAT ? 4 : 8) * count;
+		unsigned char *data = value_reserve(valuep, sz);
+		if (data == NULL)
+			return -1;
+
+		for (j = i; j < i + count; ++j)
+			if (type == ARGTYPE_DOUBLE)
+				ctx->alloc.d[j] = -1;
+			else
+				ctx->alloc.s[j] = -1;
+
+		if (type == ARGTYPE_DOUBLE)
+			memcpy(data, ctx->fpregs.d + i, sz);
+		else
+			memcpy(data, ctx->fpregs.s + i, sz);
+
+		return 0;
+
+	next:
+		continue;
+	}
+	return 1;
+}
+
+/* 0 is success, 1 is failure, negative value is an error.  */
+static int
+consider_vfp(struct fetch_context *ctx, struct process *proc,
+	     struct arg_type_info *info, struct value *valuep)
+{
+	struct arg_type_info *float_info = NULL;
+	size_t hfa_size = 1;
+	if (info->type == ARGTYPE_FLOAT || info->type == ARGTYPE_DOUBLE)
+		float_info = info;
+	else
+		float_info = type_get_hfa_type(info, &hfa_size);
+
+	if (float_info != NULL && hfa_size <= 4)
+		return pass_in_vfp(ctx, proc, float_info->type,
+				   hfa_size, valuep);
+	return 1;
+}
+
+int
+arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
+		    struct process *proc,
+		    struct arg_type_info *info, struct value *valuep)
+{
+	const size_t sz = type_sizeof(proc, info);
+	assert(sz != (size_t)-1);
+
+	if (ctx->hardfp && !ctx->in_varargs) {
+		int rc;
+		if ((rc = consider_vfp(ctx, proc, info, valuep)) != 1)
+			return rc;
+	}
+
+	/* IHI0042E_aapcs: If the argument requires double-word
+	 * alignment (8-byte), the NCRN is rounded up to the next even
+	 * register number.  */
+	const size_t al = type_alignof(proc, info);
+	assert(al != (size_t)-1);
+	if (al == 8)
+		ctx->ncrn = ((ctx->ncrn + 1) / 2) * 2;
+
+	/* If the size in words of the argument is not more than r4
+	 * minus NCRN, the argument is copied into core registers,
+	 * starting at the NCRN.  */
+	/* If the NCRN is less than r4 and the NSAA is equal to the
+	 * SP, the argument is split between core registers and the
+	 * stack.  */
+
+	const size_t words = (sz + 3) / 4;
+	if (ctx->ncrn < 4 && ctx->nsaa == ctx->sp) {
+		unsigned char *data = value_reserve(valuep, words * 4);
+		if (data == NULL)
+			return -1;
+		size_t i;
+		for (i = 0; i < words && ctx->ncrn < 4; ++i) {
+			memcpy(data, &ctx->regs.uregs[ctx->ncrn++], 4);
+			data += 4;
+		}
+		const size_t rest = (words - i) * 4;
+		if (rest > 0) {
+			umovebytes(proc, ctx->nsaa, data, rest);
+			ctx->nsaa += rest;
+		}
+		return 0;
+	}
+
+	assert(ctx->ncrn == 4);
+
+	/* If the argument required double-word alignment (8-byte),
+	 * then the NSAA is rounded up to the next double-word
+	 * address.  */
+	if (al == 8)
+		/* XXX double cast.  */
+		ctx->nsaa = (arch_addr_t)((((uintptr_t)ctx->nsaa + 7) / 8) * 8);
+	else
+		ctx->nsaa = (arch_addr_t)((((uintptr_t)ctx->nsaa + 3) / 4) * 4);
+
+	value_in_inferior(valuep, ctx->nsaa);
+	ctx->nsaa += sz;
+
+	return 0;
+}
+
+int
+arch_fetch_retval(struct fetch_context *ctx, enum tof type,
+		  struct process *proc, struct arg_type_info *info,
+		  struct value *valuep)
+{
+	if (fetch_register_banks(proc, ctx) < 0)
+		return -1;
+
+	if (ctx->hardfp && !ctx->in_varargs) {
+		int rc;
+		if ((rc = consider_vfp(ctx, proc, info, valuep)) != 1)
+			return rc;
+	}
+
+	size_t sz = type_sizeof(proc, info);
+	assert(sz != (size_t)-1);
+
+	switch (info->type) {
+		unsigned char *data;
+
+	case ARGTYPE_VOID:
+		return 0;
+
+	case ARGTYPE_FLOAT:
+	case ARGTYPE_DOUBLE:
+		if (ctx->hardfp && !ctx->in_varargs) {
+			unsigned char *data = value_reserve(valuep, sz);
+			if (data == NULL)
+				return -1;
+			memmove(data, &ctx->fpregs, sz);
+			return 0;
+		}
+		goto pass_in_registers;
+
+	case ARGTYPE_ARRAY:
+	case ARGTYPE_STRUCT:
+		if (sz > 4) {
+			value_in_inferior(valuep, ctx->ret_struct);
+			return 0;
+		}
+		/* Fall through.  */
+
+	case ARGTYPE_CHAR:
+	case ARGTYPE_SHORT:
+	case ARGTYPE_USHORT:
+	case ARGTYPE_INT:
+	case ARGTYPE_UINT:
+	case ARGTYPE_LONG:
+	case ARGTYPE_ULONG:
+	case ARGTYPE_POINTER:
+	pass_in_registers:
+		if ((data = value_reserve(valuep, sz)) == NULL)
+			return -1;
+		memmove(data, ctx->regs.uregs, sz);
+		return 0;
+	}
+	assert(info->type != info->type);
+	abort();
+}
+
+void
+arch_fetch_arg_done(struct fetch_context *context)
+{
+	free(context);
+}
+
+int
+arch_fetch_param_pack_start(struct fetch_context *context,
+			    enum param_pack_flavor ppflavor)
+{
+	if (ppflavor == PARAM_PACK_VARARGS)
+		context->in_varargs = true;
+	return 0;
+}
+
+void
+arch_fetch_param_pack_end(struct fetch_context *context)
+{
+	context->in_varargs = false;
+}
diff --git a/sysdeps/linux-gnu/arm/plt.c b/sysdeps/linux-gnu/arm/plt.c
index 1b97705..d1bf7ca 100644
--- a/sysdeps/linux-gnu/arm/plt.c
+++ b/sysdeps/linux-gnu/arm/plt.c
@@ -43,6 +43,7 @@ arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela) {
 }
 
 void *
-sym2addr(Process *proc, struct library_symbol *sym) {
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
 	return sym->enter_addr;
 }
diff --git a/sysdeps/linux-gnu/arm/regs.c b/sysdeps/linux-gnu/arm/regs.c
index 484de7f..e9e825e 100644
--- a/sysdeps/linux-gnu/arm/regs.c
+++ b/sysdeps/linux-gnu/arm/regs.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 1998,2002,2004,2008,2009 Juan Cespedes
  * Copyright (C) 2009 Juan Cespedes
  *
@@ -24,9 +25,11 @@
 #include <sys/types.h>
 #include <sys/ptrace.h>
 #include <asm/ptrace.h>
+#include <errno.h>
 
 #include "proc.h"
 #include "common.h"
+#include "regs.h"
 
 #if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
 # define PTRACE_PEEKUSER PTRACE_PEEKUSR
@@ -36,45 +39,119 @@
 # define PTRACE_POKEUSER PTRACE_POKEUSR
 #endif
 
-#define off_pc ((void *)60)
-#define off_lr ((void *)56)
-#define off_sp ((void *)52)
+int
+arm_get_register(struct process *proc, enum arm_register reg, uint32_t *lp)
+{
+	errno = 0;
+	long l = ptrace(PTRACE_PEEKUSER, proc->pid, (void *)(reg * 4L), 0);
+	if (l == -1 && errno != 0)
+		return -1;
+	*lp = (uint32_t)l;
+	return 0;
+}
 
-void *
-get_instruction_pointer(Process *proc) {
-	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_pc, 0);
+int
+arm_set_register(struct process *proc, enum arm_register reg, uint32_t lp)
+{
+	return ptrace(PTRACE_PEEKUSER, proc->pid,
+		      (void *)(reg * 4L), (void *)lp);
 }
 
-void
-set_instruction_pointer(Process *proc, void *addr) {
-	ptrace(PTRACE_POKEUSER, proc->pid, off_pc, addr);
+int
+arm_get_register_offpc(struct process *proc, enum arm_register reg,
+		       uint32_t *lp)
+{
+	if (arm_get_register(proc, reg, lp) < 0)
+		return -1;
+	if (reg == ARM_REG_PC)
+		*lp += 8;
+	return 0;
 }
 
-void *
-get_stack_pointer(Process *proc) {
-	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_sp, 0);
+int
+arm_get_shifted_register(struct process *proc, uint32_t inst, int carry,
+			 arch_addr_t pc_val, uint32_t *lp)
+{
+	enum arm_register rm = BITS(inst, 0, 3);
+	unsigned long shifttype = BITS(inst, 5, 6);
+
+	uint32_t shift;
+	if (BIT(inst, 4)) {
+		if (arm_get_register_offpc(proc, BITS(inst, 8, 11), &shift) < 0)
+			return -1;
+		shift &= 0xff;
+	} else {
+		shift = BITS(inst, 7, 11);
+	}
+
+	uint32_t res;
+	if (rm == ARM_REG_PC)
+		/* xxx double cast */
+		res = (uintptr_t)pc_val + (BIT(inst, 4) ? 12 : 8);
+	else if (arm_get_register(proc, rm, &res) < 0)
+		return -1;
+
+	switch (shifttype) {
+	case 0:			/* LSL */
+		res = shift >= 32 ? 0 : res << shift;
+		break;
+
+	case 1:			/* LSR */
+		res = shift >= 32 ? 0 : res >> shift;
+		break;
+
+	case 2:			/* ASR */
+		if (shift >= 32)
+			shift = 31;
+		res = ((res & 0x80000000L)
+		       ? ~((~res) >> shift) : res >> shift);
+		break;
+
+	case 3:			/* ROR/RRX */
+		shift &= 31;
+		if (shift == 0)
+			res = (res >> 1) | (carry ? 0x80000000L : 0);
+		else
+			res = (res >> shift) | (res << (32 - shift));
+		break;
+	}
+
+	*lp = res & 0xffffffff;
+	return 0;
 }
 
-/* really, this is given the *stack_pointer expecting
- * a CISC architecture; in our case, we don't need that */
-void *
-get_return_addr(Process *proc, void *stack_pointer) {
-	long addr = ptrace(PTRACE_PEEKUSER, proc->pid, off_lr, 0);
-
-	/* Remember & unset the thumb mode bit.  XXX This is really a
-	 * bit of a hack, as we assume that the following
-	 * insert_breakpoint call will be related to this address.
-	 * This interface should really be get_return_breakpoint, or
-	 * maybe install_return_breakpoint.  */
-	proc->thumb_mode = addr & 1;
-	if (proc->thumb_mode)
-		addr &= ~1;
-
-	return (void *)addr;
+static arch_addr_t
+get_register_nocheck(struct process *proc, enum arm_register r)
+{
+	uint32_t reg;
+	if (arm_get_register(proc, r, &reg) < 0)
+		/* XXX double cast. */
+		return (arch_addr_t)-1;
+	/* XXX double cast.  */
+	return (arch_addr_t)(uintptr_t)reg;
+}
+
+arch_addr_t
+get_instruction_pointer(struct process *proc)
+{
+	return get_register_nocheck(proc, ARM_REG_PC);
 }
 
 void
-set_return_addr(Process *proc, void *addr) {
-	long iaddr = (int)addr | proc->thumb_mode;
-	ptrace(PTRACE_POKEUSER, proc->pid, off_lr, (void *)iaddr);
+set_instruction_pointer(struct process *proc, arch_addr_t addr)
+{
+	/* XXX double cast.  */
+	arm_set_register(proc, ARM_REG_PC, (uint32_t)addr);
+}
+
+void *
+get_stack_pointer(struct process *proc)
+{
+	return get_register_nocheck(proc, ARM_REG_SP);
+}
+
+arch_addr_t
+get_return_addr(struct process *proc, arch_addr_t stack_pointer)
+{
+	return get_register_nocheck(proc, ARM_REG_LR);
 }
diff --git a/sysdeps/linux-gnu/arm/regs.h b/sysdeps/linux-gnu/arm/regs.h
new file mode 100644
index 0000000..f9a5a86
--- /dev/null
+++ b/sysdeps/linux-gnu/arm/regs.h
@@ -0,0 +1,47 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#define SUBMASK(x) ((1L << ((x) + 1)) - 1)
+#define BIT(obj,st) (((obj) >> (st)) & 1)
+#define BITS(obj,st,fn) (((obj) >> (st)) & SUBMASK((fn) - (st)))
+#define SBITS(obj,st,fn) \
+	((long) (BITS(obj,st,fn) | ((long) BIT(obj,fn) * ~ SUBMASK(fn - st))))
+
+enum arm_register {
+	ARM_REG_R7 = 7,
+	ARM_REG_IP = 12,
+	ARM_REG_SP = 13,
+	ARM_REG_LR = 14,
+	ARM_REG_PC = 15,
+	ARM_REG_CPSR = 16,
+};
+
+/* Write value of register REG to *LP.  Return 0 on success or a
+ * negative value on failure.  */
+int arm_get_register(struct process *proc, enum arm_register reg, uint32_t *lp);
+
+/* Same as above, but if REG==ARM_REG_PC, it returns the value +8.  */
+int arm_get_register_offpc(struct process *proc, enum arm_register reg,
+			   uint32_t *lp);
+
+/* Same as arm_get_register, but shift is performed depending on
+ * instruction INST.  */
+int arm_get_shifted_register(struct process *proc, uint32_t inst, int carry,
+			     arch_addr_t pc, uint32_t *lp);
diff --git a/sysdeps/linux-gnu/arm/trace.c b/sysdeps/linux-gnu/arm/trace.c
index c528cfb..5e51e91 100644
--- a/sysdeps/linux-gnu/arm/trace.c
+++ b/sysdeps/linux-gnu/arm/trace.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2012, 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 1998,2004,2008,2009 Juan Cespedes
  * Copyright (C) 2006 Ian Wienand
  *
@@ -29,10 +29,13 @@
 #include <sys/ptrace.h>
 #include <asm/ptrace.h>
 
-#include "proc.h"
+#include "bits.h"
 #include "common.h"
+#include "proc.h"
 #include "output.h"
 #include "ptrace.h"
+#include "regs.h"
+#include "type.h"
 
 #if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
 # define PTRACE_PEEKUSER PTRACE_PEEKUSR
@@ -42,13 +45,9 @@
 # define PTRACE_POKEUSER PTRACE_POKEUSR
 #endif
 
-#define off_r0 ((void *)0)
-#define off_r7 ((void *)28)
-#define off_ip ((void *)48)
-#define off_pc ((void *)60)
-
 void
-get_arch_dep(Process *proc) {
+get_arch_dep(struct process *proc)
+{
 	proc_archdep *a;
 
 	if (!proc->arch_ptr)
@@ -63,21 +62,28 @@ get_arch_dep(Process *proc) {
  *         -1 on error.
  */
 int
-syscall_p(Process *proc, int status, int *sysnum) {
+syscall_p(struct process *proc, int status, int *sysnum)
+{
 	if (WIFSTOPPED(status)
 	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
-		/* get the user's pc (plus 8) */
-		unsigned pc = ptrace(PTRACE_PEEKUSER, proc->pid, off_pc, 0);
+		uint32_t pc, ip;
+		if (arm_get_register(proc, ARM_REG_PC, &pc) < 0
+		    || arm_get_register(proc, ARM_REG_IP, &ip) < 0)
+			return -1;
+
 		pc = pc - 4;
+
 		/* fetch the SWI instruction */
 		unsigned insn = ptrace(PTRACE_PEEKTEXT, proc->pid,
 				       (void *)pc, 0);
-		int ip = ptrace(PTRACE_PEEKUSER, proc->pid, off_ip, 0);
 
 		if (insn == 0xef000000 || insn == 0x0f000000
 		    || (insn & 0xffff0000) == 0xdf000000) {
 			/* EABI syscall */
-			*sysnum = ptrace(PTRACE_PEEKUSER, proc->pid, off_r7, 0);
+			uint32_t r7;
+			if (arm_get_register(proc, ARM_REG_R7, &r7) < 0)
+				return -1;
+			*sysnum = r7;
 		} else if ((insn & 0xfff00000) == 0xef900000) {
 			/* old ABI syscall */
 			*sysnum = insn & 0xfffff;
@@ -103,46 +109,605 @@ syscall_p(Process *proc, int status, int *sysnum) {
 	return 0;
 }
 
-long
-gimme_arg(enum tof type, Process *proc, int arg_num, struct arg_type_info *info)
+static arch_addr_t
+arm_branch_dest(const arch_addr_t pc, const uint32_t insn)
 {
-	proc_archdep *a = (proc_archdep *) proc->arch_ptr;
+	/* Bits 0-23 are signed immediate value.  */
+	return pc + ((((insn & 0xffffff) ^ 0x800000) - 0x800000) << 2) + 8;
+}
 
-	if (arg_num == -1) {	/* return value */
-		return ptrace(PTRACE_PEEKUSER, proc->pid, off_r0, 0);
-	}
+/* Addresses for calling Thumb functions have the bit 0 set.
+   Here are some macros to test, set, or clear bit 0 of addresses.  */
+/* XXX double cast */
+#define IS_THUMB_ADDR(addr)	((uintptr_t)(addr) & 1)
+#define MAKE_THUMB_ADDR(addr)	((arch_addr_t)((uintptr_t)(addr) | 1))
+#define UNMAKE_THUMB_ADDR(addr) ((arch_addr_t)((uintptr_t)(addr) & ~1))
 
-	/* deal with the ARM calling conventions */
-	if (type == LT_TOF_FUNCTION || type == LT_TOF_FUNCTIONR) {
-		if (arg_num < 4) {
-			if (a->valid && type == LT_TOF_FUNCTION)
-				return a->regs.uregs[arg_num];
-			if (a->valid && type == LT_TOF_FUNCTIONR)
-				return a->func_arg[arg_num];
-			return ptrace(PTRACE_PEEKUSER, proc->pid,
-				      (void *)(4 * arg_num), 0);
-		} else {
-			return ptrace(PTRACE_PEEKDATA, proc->pid,
-				      proc->stack_pointer + 4 * (arg_num - 4),
-				      0);
+enum {
+	COND_ALWAYS = 0xe,
+	COND_NV = 0xf,
+	FLAG_C = 0x20000000,
+};
+
+static int
+arm_get_next_pcs(struct process *proc,
+		 const arch_addr_t pc, arch_addr_t next_pcs[2])
+{
+	uint32_t this_instr;
+	uint32_t status;
+	if (proc_read_32(proc, pc, &this_instr) < 0
+	    || arm_get_register(proc, ARM_REG_CPSR, &status) < 0)
+		return -1;
+
+	/* In theory, we sometimes don't even need to add any
+	 * breakpoints at all.  If the conditional bits of the
+	 * instruction indicate that it should not be taken, then we
+	 * can just skip it altogether without bothering.  We could
+	 * also emulate the instruction under the breakpoint.
+	 *
+	 * Here, we make it as simple as possible (though We Accept
+	 * Patches).  */
+	int nr = 0;
+
+	/* ARM can branch either relatively by using a branch
+	 * instruction, or absolutely, by doing arbitrary arithmetic
+	 * with PC as the destination.  */
+	const unsigned cond = BITS(this_instr, 28, 31);
+	const unsigned opcode = BITS(this_instr, 24, 27);
+
+	if (cond == COND_NV)
+		switch (opcode) {
+			arch_addr_t addr;
+		case 0xa:
+		case 0xb:
+			/* Branch with Link and change to Thumb.  */
+			/* XXX double cast.  */
+			addr = (arch_addr_t)
+				((uint32_t)arm_branch_dest(pc, this_instr)
+				 | (((this_instr >> 24) & 0x1) << 1));
+			next_pcs[nr++] = MAKE_THUMB_ADDR(addr);
+			break;
 		}
-	} else if (type == LT_TOF_SYSCALL || type == LT_TOF_SYSCALLR) {
-		if (arg_num < 5) {
-			if (a->valid && type == LT_TOF_SYSCALL)
-				return a->regs.uregs[arg_num];
-			if (a->valid && type == LT_TOF_SYSCALLR)
-				return a->sysc_arg[arg_num];
-			return ptrace(PTRACE_PEEKUSER, proc->pid,
-				      (void *)(4 * arg_num), 0);
-		} else {
-			return ptrace(PTRACE_PEEKDATA, proc->pid,
-				      proc->stack_pointer + 4 * (arg_num - 5),
-				      0);
+	else
+		switch (opcode) {
+			uint32_t operand1, operand2, result = 0;
+		case 0x0:
+		case 0x1:			/* data processing */
+		case 0x2:
+		case 0x3:
+			if (BITS(this_instr, 12, 15) != ARM_REG_PC)
+				break;
+
+			if (BITS(this_instr, 22, 25) == 0
+			    && BITS(this_instr, 4, 7) == 9) {	/* multiply */
+			invalid:
+				fprintf(stderr,
+				"Invalid update to pc in instruction.\n");
+				break;
+			}
+
+			/* BX <reg>, BLX <reg> */
+			if (BITS(this_instr, 4, 27) == 0x12fff1
+			    || BITS(this_instr, 4, 27) == 0x12fff3) {
+				enum arm_register reg = BITS(this_instr, 0, 3);
+				/* XXX double cast: no need to go
+				 * through tmp.  */
+				uint32_t tmp;
+				if (arm_get_register_offpc(proc, reg, &tmp) < 0)
+					return -1;
+				next_pcs[nr++] = (arch_addr_t)tmp;
+				return 0;
+			}
+
+			/* Multiply into PC.  */
+			if (arm_get_register_offpc
+			    (proc, BITS(this_instr, 16, 19), &operand1) < 0)
+				return -1;
+
+			int c = (status & FLAG_C) ? 1 : 0;
+			if (BIT(this_instr, 25)) {
+				uint32_t immval = BITS(this_instr, 0, 7);
+				uint32_t rotate = 2 * BITS(this_instr, 8, 11);
+				operand2 = (((immval >> rotate)
+					     | (immval << (32 - rotate)))
+					    & 0xffffffff);
+			} else {
+				/* operand 2 is a shifted register.  */
+				if (arm_get_shifted_register
+				    (proc, this_instr, c, pc, &operand2) < 0)
+					return -1;
+			}
+
+			switch (BITS(this_instr, 21, 24)) {
+			case 0x0:	/*and */
+				result = operand1 & operand2;
+				break;
+
+			case 0x1:	/*eor */
+				result = operand1 ^ operand2;
+				break;
+
+			case 0x2:	/*sub */
+				result = operand1 - operand2;
+				break;
+
+			case 0x3:	/*rsb */
+				result = operand2 - operand1;
+				break;
+
+			case 0x4:	/*add */
+				result = operand1 + operand2;
+				break;
+
+			case 0x5:	/*adc */
+				result = operand1 + operand2 + c;
+				break;
+
+			case 0x6:	/*sbc */
+				result = operand1 - operand2 + c;
+				break;
+
+			case 0x7:	/*rsc */
+				result = operand2 - operand1 + c;
+				break;
+
+			case 0x8:
+			case 0x9:
+			case 0xa:
+			case 0xb:	/* tst, teq, cmp, cmn */
+				/* Only take the default branch.  */
+				result = 0;
+				break;
+
+			case 0xc:	/*orr */
+				result = operand1 | operand2;
+				break;
+
+			case 0xd:	/*mov */
+				/* Always step into a function.  */
+				result = operand2;
+				break;
+
+			case 0xe:	/*bic */
+				result = operand1 & ~operand2;
+				break;
+
+			case 0xf:	/*mvn */
+				result = ~operand2;
+				break;
+			}
+
+			/* XXX double cast */
+			next_pcs[nr++] = (arch_addr_t)result;
+			break;
+
+		case 0x4:
+		case 0x5:		/* data transfer */
+		case 0x6:
+		case 0x7:
+			/* Ignore if insn isn't load or Rn not PC.  */
+			if (!BIT(this_instr, 20)
+			    || BITS(this_instr, 12, 15) != ARM_REG_PC)
+				break;
+
+			if (BIT(this_instr, 22))
+				goto invalid;
+
+			/* byte write to PC */
+			uint32_t base;
+			if (arm_get_register_offpc
+			    (proc, BITS(this_instr, 16, 19), &base) < 0)
+				return -1;
+
+			if (BIT(this_instr, 24)) {
+				/* pre-indexed */
+				int c = (status & FLAG_C) ? 1 : 0;
+				uint32_t offset;
+				if (BIT(this_instr, 25)) {
+					if (arm_get_shifted_register
+					    (proc, this_instr, c,
+					     pc, &offset) < 0)
+						return -1;
+				} else {
+					offset = BITS(this_instr, 0, 11);
+				}
+
+				if (BIT(this_instr, 23))
+					base += offset;
+				else
+					base -= offset;
+			}
+
+			/* XXX two double casts.  */
+			uint32_t next;
+			if (proc_read_32(proc, (arch_addr_t)base, &next) < 0)
+				return -1;
+			next_pcs[nr++] = (arch_addr_t)next;
+			break;
+
+		case 0x8:
+		case 0x9:		/* block transfer */
+			if (!BIT(this_instr, 20))
+				break;
+			/* LDM */
+			if (BIT(this_instr, 15)) {
+				/* Loading pc.  */
+				int offset = 0;
+				enum arm_register rn = BITS(this_instr, 16, 19);
+				uint32_t rn_val;
+				if (arm_get_register(proc, rn, &rn_val) < 0)
+					return -1;
+
+				int pre = BIT(this_instr, 24);
+				if (BIT(this_instr, 23)) {
+					/* Bit U = up.  */
+					unsigned reglist
+						= BITS(this_instr, 0, 14);
+					offset = bitcount(reglist) * 4;
+					if (pre)
+						offset += 4;
+				} else if (pre) {
+					offset = -4;
+				}
+
+				/* XXX double cast.  */
+				arch_addr_t addr
+					= (arch_addr_t)(rn_val + offset);
+				uint32_t next;
+				if (proc_read_32(proc, addr, &next) < 0)
+					return -1;
+				next_pcs[nr++] = (arch_addr_t)next;
+			}
+			break;
+
+		case 0xb:		/* branch & link */
+		case 0xa:		/* branch */
+			next_pcs[nr++] = arm_branch_dest(pc, this_instr);
+			break;
+
+		case 0xc:
+		case 0xd:
+		case 0xe:		/* coproc ops */
+		case 0xf:		/* SWI */
+			break;
+		}
+
+	/* Otherwise take the next instruction.  */
+	if (cond != COND_ALWAYS || nr == 0)
+		next_pcs[nr++] = pc + 4;
+	return 0;
+}
+
+/* Return the size in bytes of the complete Thumb instruction whose
+ * first halfword is INST1.  */
+
+static int
+thumb_insn_size (unsigned short inst1)
+{
+  if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0)
+	  return 4;
+  else
+	  return 2;
+}
+
+static int
+thumb_get_next_pcs(struct process *proc,
+		   const arch_addr_t pc, arch_addr_t next_pcs[2])
+{
+	uint16_t inst1;
+	uint32_t status;
+	if (proc_read_16(proc, pc, &inst1) < 0
+	    || arm_get_register(proc, ARM_REG_CPSR, &status) < 0)
+		return -1;
+
+	int nr = 0;
+
+	/* We currently ignore Thumb-2 conditional execution support
+	 * (the IT instruction).  No branches are allowed in IT block,
+	 * and it's not legal to jump in the middle of it, so unless
+	 * we need to singlestep through large swaths of code, which
+	 * we currently don't, we can ignore them.  */
+
+	if ((inst1 & 0xff00) == 0xbd00)	{ /* pop {rlist, pc} */
+		/* Fetch the saved PC from the stack.  It's stored
+		 * above all of the other registers.  */
+		const unsigned offset = bitcount(BITS(inst1, 0, 7)) * 4;
+		uint32_t sp;
+		uint32_t next;
+		/* XXX two double casts */
+		if (arm_get_register(proc, ARM_REG_SP, &sp) < 0
+		    || proc_read_32(proc, (arch_addr_t)(sp + offset),
+				    &next) < 0)
+			return -1;
+		next_pcs[nr++] = (arch_addr_t)next;
+	} else if ((inst1 & 0xf000) == 0xd000) { /* conditional branch */
+		const unsigned long cond = BITS(inst1, 8, 11);
+		if (cond != 0x0f) { /* SWI */
+			next_pcs[nr++] = pc + (SBITS(inst1, 0, 7) << 1);
+			if (cond == COND_ALWAYS)
+				return 0;
+		}
+	} else if ((inst1 & 0xf800) == 0xe000) { /* unconditional branch */
+		next_pcs[nr++] = pc + (SBITS(inst1, 0, 10) << 1);
+	} else if (thumb_insn_size(inst1) == 4) { /* 32-bit instruction */
+		unsigned short inst2;
+		if (proc_read_16(proc, pc + 2, &inst2) < 0)
+			return -1;
+
+		if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) {
+			/* Branches and miscellaneous control instructions.  */
+
+			if ((inst2 & 0x1000) != 0
+			    || (inst2 & 0xd001) == 0xc000) {
+				/* B, BL, BLX.  */
+
+				const int imm1 = SBITS(inst1, 0, 10);
+				const unsigned imm2 = BITS(inst2, 0, 10);
+				const unsigned j1 = BIT(inst2, 13);
+				const unsigned j2 = BIT(inst2, 11);
+
+				int32_t offset
+					= ((imm1 << 12) + (imm2 << 1));
+				offset ^= ((!j2) << 22) | ((!j1) << 23);
+
+				/* XXX double cast */
+				uint32_t next = (uint32_t)(pc + offset);
+				/* For BLX make sure to clear the low bits.  */
+				if (BIT(inst2, 12) == 0)
+					next = next & 0xfffffffc;
+				/* XXX double cast */
+				next_pcs[nr++] = (arch_addr_t)next;
+				return 0;
+			} else if (inst1 == 0xf3de
+				   && (inst2 & 0xff00) == 0x3f00) {
+				/* SUBS PC, LR, #imm8.  */
+				uint32_t next;
+				if (arm_get_register(proc, ARM_REG_LR,
+						     &next) < 0)
+					return -1;
+				next -= inst2 & 0x00ff;
+				/* XXX double cast */
+				next_pcs[nr++] = (arch_addr_t)next;
+				return 0;
+			} else if ((inst2 & 0xd000) == 0x8000
+				   && (inst1 & 0x0380) != 0x0380) {
+				/* Conditional branch.  */
+				const int sign = SBITS(inst1, 10, 10);
+				const unsigned imm1 = BITS(inst1, 0, 5);
+				const unsigned imm2 = BITS(inst2, 0, 10);
+				const unsigned j1 = BIT(inst2, 13);
+				const unsigned j2 = BIT(inst2, 11);
+
+				int32_t offset = (sign << 20)
+					+ (j2 << 19) + (j1 << 18);
+				offset += (imm1 << 12) + (imm2 << 1);
+				next_pcs[nr++] = pc + offset;
+				if (BITS(inst1, 6, 9) == COND_ALWAYS)
+					return 0;
+			}
+		} else if ((inst1 & 0xfe50) == 0xe810) {
+			int load_pc = 1;
+			int offset;
+			const enum arm_register rn = BITS(inst1, 0, 3);
+
+			if (BIT(inst1, 7) && !BIT(inst1, 8)) {
+				/* LDMIA or POP */
+				if (!BIT(inst2, 15))
+					load_pc = 0;
+				offset = bitcount(inst2) * 4 - 4;
+			} else if (!BIT(inst1, 7) && BIT(inst1, 8)) {
+				/* LDMDB */
+				if (!BIT(inst2, 15))
+					load_pc = 0;
+				offset = -4;
+			} else if (BIT(inst1, 7) && BIT(inst1, 8)) {
+				/* RFEIA */
+				offset = 0;
+			} else if (!BIT(inst1, 7) && !BIT(inst1, 8)) {
+				/* RFEDB */
+				offset = -8;
+			} else {
+				load_pc = 0;
+			}
+
+			if (load_pc) {
+				uint32_t addr;
+				if (arm_get_register(proc, rn, &addr) < 0)
+					return -1;
+				arch_addr_t a = (arch_addr_t)(addr + offset);
+				uint32_t next;
+				if (proc_read_32(proc, a, &next) < 0)
+					return -1;
+				/* XXX double cast */
+				next_pcs[nr++] = (arch_addr_t)next;
+			}
+		} else if ((inst1 & 0xffef) == 0xea4f
+			   && (inst2 & 0xfff0) == 0x0f00) {
+			/* MOV PC or MOVS PC.  */
+			const enum arm_register rn = BITS(inst2, 0, 3);
+			uint32_t next;
+			if (arm_get_register(proc, rn, &next) < 0)
+				return -1;
+			/* XXX double cast */
+			next_pcs[nr++] = (arch_addr_t)next;
+		} else if ((inst1 & 0xff70) == 0xf850
+			   && (inst2 & 0xf000) == 0xf000) {
+			/* LDR PC.  */
+			const enum arm_register rn = BITS(inst1, 0, 3);
+			uint32_t base;
+			if (arm_get_register(proc, rn, &base) < 0)
+				return -1;
+
+			int load_pc = 1;
+			if (rn == ARM_REG_PC) {
+				base = (base + 4) & ~(uint32_t)0x3;
+				if (BIT(inst1, 7))
+					base += BITS(inst2, 0, 11);
+				else
+					base -= BITS(inst2, 0, 11);
+			} else if (BIT(inst1, 7)) {
+				base += BITS(inst2, 0, 11);
+			} else if (BIT(inst2, 11)) {
+				if (BIT(inst2, 10)) {
+					if (BIT(inst2, 9))
+						base += BITS(inst2, 0, 7);
+					else
+						base -= BITS(inst2, 0, 7);
+				}
+			} else if ((inst2 & 0x0fc0) == 0x0000) {
+				const int shift = BITS(inst2, 4, 5);
+				const enum arm_register rm = BITS(inst2, 0, 3);
+				uint32_t v;
+				if (arm_get_register(proc, rm, &v) < 0)
+					return -1;
+				base += v << shift;
+			} else {
+				/* Reserved.  */
+				load_pc = 0;
+			}
+
+			if (load_pc) {
+				/* xxx double casts */
+				uint32_t next;
+				if (proc_read_32(proc,
+						 (arch_addr_t)base, &next) < 0)
+					return -1;
+				next_pcs[nr++] = (arch_addr_t)next;
+			}
+		} else if ((inst1 & 0xfff0) == 0xe8d0
+			   && (inst2 & 0xfff0) == 0xf000) {
+			/* TBB.  */
+			const enum arm_register tbl_reg = BITS(inst1, 0, 3);
+			const enum arm_register off_reg = BITS(inst2, 0, 3);
+
+			uint32_t table;
+			if (tbl_reg == ARM_REG_PC)
+				/* Regcache copy of PC isn't right yet.  */
+				/* XXX double cast */
+				table = (uint32_t)pc + 4;
+			else if (arm_get_register(proc, tbl_reg, &table) < 0)
+				return -1;
+
+			uint32_t offset;
+			if (arm_get_register(proc, off_reg, &offset) < 0)
+				return -1;
+
+			table += offset;
+			uint8_t length;
+			/* XXX double cast */
+			if (proc_read_8(proc, (arch_addr_t)table, &length) < 0)
+				return -1;
+
+			next_pcs[nr++] = pc + 2 * length;
+
+		} else if ((inst1 & 0xfff0) == 0xe8d0
+			   && (inst2 & 0xfff0) == 0xf010) {
+			/* TBH.  */
+			const enum arm_register tbl_reg = BITS(inst1, 0, 3);
+			const enum arm_register off_reg = BITS(inst2, 0, 3);
+
+			uint32_t table;
+			if (tbl_reg == ARM_REG_PC)
+				/* Regcache copy of PC isn't right yet.  */
+				/* XXX double cast */
+				table = (uint32_t)pc + 4;
+			else if (arm_get_register(proc, tbl_reg, &table) < 0)
+				return -1;
+
+			uint32_t offset;
+			if (arm_get_register(proc, off_reg, &offset) < 0)
+				return -1;
+
+			table += 2 * offset;
+			uint16_t length;
+			/* XXX double cast */
+			if (proc_read_16(proc, (arch_addr_t)table, &length) < 0)
+				return -1;
+
+			next_pcs[nr++] = pc + 2 * length;
 		}
-	} else {
-		fprintf(stderr, "gimme_arg called with wrong arguments\n");
-		exit(1);
 	}
 
+
+	/* Otherwise take the next instruction.  */
+	if (nr == 0)
+		next_pcs[nr++] = pc + thumb_insn_size(inst1);
 	return 0;
 }
+
+enum sw_singlestep_status
+arch_sw_singlestep(struct process *proc, struct breakpoint *sbp,
+		   int (*add_cb)(arch_addr_t, struct sw_singlestep_data *),
+		   struct sw_singlestep_data *add_cb_data)
+{
+	const arch_addr_t pc = get_instruction_pointer(proc);
+
+	uint32_t cpsr;
+	if (arm_get_register(proc, ARM_REG_CPSR, &cpsr) < 0)
+		return SWS_FAIL;
+
+	const unsigned thumb_p = BIT(cpsr, 5);
+	arch_addr_t next_pcs[2] = {};
+	if ((thumb_p ? &thumb_get_next_pcs
+	     : &arm_get_next_pcs)(proc, pc, next_pcs) < 0)
+		return SWS_FAIL;
+
+	int i;
+	for (i = 0; i < 2; ++i) {
+		/* XXX double cast.  */
+		arch_addr_t target
+			= (arch_addr_t)(((uintptr_t)next_pcs[i]) | thumb_p);
+		if (next_pcs[i] != 0 && add_cb(target, add_cb_data) < 0)
+			return SWS_FAIL;
+	}
+
+	debug(1, "PTRACE_CONT");
+	ptrace(PTRACE_CONT, proc->pid, 0, 0);
+	return SWS_OK;
+}
+
+size_t
+arch_type_sizeof(struct process *proc, struct arg_type_info *info)
+{
+	if (proc == NULL)
+		return (size_t)-2;
+
+	switch (info->type) {
+	case ARGTYPE_VOID:
+		return 0;
+
+	case ARGTYPE_CHAR:
+		return 1;
+
+	case ARGTYPE_SHORT:
+	case ARGTYPE_USHORT:
+		return 2;
+
+	case ARGTYPE_INT:
+	case ARGTYPE_UINT:
+	case ARGTYPE_LONG:
+	case ARGTYPE_ULONG:
+	case ARGTYPE_POINTER:
+		return 4;
+
+	case ARGTYPE_FLOAT:
+		return 4;
+	case ARGTYPE_DOUBLE:
+		return 8;
+
+	case ARGTYPE_ARRAY:
+	case ARGTYPE_STRUCT:
+		/* Use default value.  */
+		return (size_t)-2;
+
+	default:
+		assert(info->type != info->type);
+		abort();
+	}
+}
+
+size_t
+arch_type_alignof(struct process *proc, struct arg_type_info *info)
+{
+	return arch_type_sizeof(proc, info);
+}
diff --git a/sysdeps/linux-gnu/breakpoint.c b/sysdeps/linux-gnu/breakpoint.c
index fe336b1..c28d745 100644
--- a/sysdeps/linux-gnu/breakpoint.c
+++ b/sysdeps/linux-gnu/breakpoint.c
@@ -79,7 +79,7 @@ arch_enable_breakpoint(pid_t pid, struct breakpoint *sbp)
 #endif				/* ARCH_HAVE_ENABLE_BREAKPOINT */
 
 void
-enable_breakpoint(Process *proc, struct breakpoint *sbp)
+enable_breakpoint(struct process *proc, struct breakpoint *sbp)
 {
 	debug(DEBUG_PROCESS, "enable_breakpoint: pid=%d, addr=%p, symbol=%s",
 	      proc->pid, sbp->addr, breakpoint_name(sbp));
@@ -127,7 +127,7 @@ arch_disable_breakpoint(pid_t pid, const struct breakpoint *sbp)
 #endif				/* ARCH_HAVE_DISABLE_BREAKPOINT */
 
 void
-disable_breakpoint(Process *proc, struct breakpoint *sbp)
+disable_breakpoint(struct process *proc, struct breakpoint *sbp)
 {
 	debug(DEBUG_PROCESS, "disable_breakpoint: pid=%d, addr=%p, symbol=%s",
 	      proc->pid, sbp->addr, breakpoint_name(sbp));
diff --git a/sysdeps/linux-gnu/cris/Makefile.in b/sysdeps/linux-gnu/cris/Makefile.in
deleted file mode 100644
index c978410..0000000
--- a/sysdeps/linux-gnu/cris/Makefile.in
+++ /dev/null
@@ -1,528 +0,0 @@
-# Makefile.in generated by automake 1.11.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# This file is part of ltrace.
-# Copyright (C) 2012 Edgar E. Iglesias, Axis Communications
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-# 02110-1301 USA
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diff --git a/sysdeps/linux-gnu/cris/plt.c b/sysdeps/linux-gnu/cris/plt.c
index 427ae93..fcc18d2 100644
--- a/sysdeps/linux-gnu/cris/plt.c
+++ b/sysdeps/linux-gnu/cris/plt.c
@@ -28,7 +28,7 @@ GElf_Addr arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela)
 	return lte->plt_addr + 0x20 + (ndx * 26);
 }
 
-void *sym2addr(Process *proc, struct library_symbol *sym)
+void *sym2addr(struct process *proc, struct library_symbol *sym)
 {
 	return sym->enter_addr;
 }
diff --git a/sysdeps/linux-gnu/cris/regs.c b/sysdeps/linux-gnu/cris/regs.c
index 7028b9e..4cf1fbf 100644
--- a/sysdeps/linux-gnu/cris/regs.c
+++ b/sysdeps/linux-gnu/cris/regs.c
@@ -37,22 +37,22 @@
 # define PTRACE_POKEUSER PTRACE_POKEUSR
 #endif
 
-void *get_instruction_pointer(Process *proc)
+void *get_instruction_pointer(struct process *proc)
 {
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_PPC, 0);
 }
 
-void set_instruction_pointer(Process *proc, void *addr)
+void set_instruction_pointer(struct process *proc, void *addr)
 {
 	ptrace(PTRACE_POKEUSER, proc->pid, 4 * PT_PPC, addr);
 }
 
-void *get_stack_pointer(Process *proc)
+void *get_stack_pointer(struct process *proc)
 {
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_USP, 0);
 }
 
-void *get_return_addr(Process *proc, void *stack_pointer)
+void *get_return_addr(struct process *proc, void *stack_pointer)
 {
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_SRP, 0);
 }
diff --git a/sysdeps/linux-gnu/cris/trace.c b/sysdeps/linux-gnu/cris/trace.c
index 98cb7d8..7d8cca6 100644
--- a/sysdeps/linux-gnu/cris/trace.c
+++ b/sysdeps/linux-gnu/cris/trace.c
@@ -40,14 +40,14 @@
 # define PTRACE_POKEUSER PTRACE_POKEUSR
 #endif
 
-void get_arch_dep(Process *proc)
+void get_arch_dep(struct process *proc)
 {
 }
 
 /* Returns 1 if syscall, 2 if sysret, 0 otherwise.
  */
 #define SYSCALL_INSN   0xe93d
-int syscall_p(Process *proc, int status, int *sysnum)
+int syscall_p(struct process *proc, int status, int *sysnum)
 {
 	if (WIFSTOPPED(status)
 	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
@@ -71,7 +71,7 @@ int syscall_p(Process *proc, int status, int *sysnum)
 	return 0;
 }
 
-long gimme_arg(enum tof type, Process *proc, int arg_num,
+long gimme_arg(enum tof type, struct process *proc, int arg_num,
 	       struct arg_type_info *info)
 {
 	int pid = proc->pid;
diff --git a/sysdeps/linux-gnu/events.c b/sysdeps/linux-gnu/events.c
index 077a656..51c2cae 100644
--- a/sysdeps/linux-gnu/events.c
+++ b/sysdeps/linux-gnu/events.c
@@ -48,7 +48,7 @@ static Event * delayed_events = NULL;
 static Event * end_delayed_events = NULL;
 
 static enum callback_status
-first (Process * proc, void * data)
+first(struct process *proc, void *data)
 {
 	return CBS_STOP;
 }
@@ -83,12 +83,12 @@ each_qd_event(enum ecb_status (*pred)(Event *, void *), void * data)
 	Event * event;
 	for (event = prev; event != NULL; ) {
 		switch ((*pred)(event, data)) {
-		case ecb_cont:
+		case ECB_CONT:
 			prev = event;
 			event = event->next;
 			continue;
 
-		case ecb_deque:
+		case ECB_DEQUE:
 			debug(DEBUG_FUNCTION, "dequeuing event %d for %d",
 			      event->type,
 			      event->proc != NULL ? event->proc->pid : -1);
@@ -106,7 +106,7 @@ each_qd_event(enum ecb_status (*pred)(Event *, void *), void * data)
 				end_delayed_events = NULL;
 			/* fall-through */
 
-		case ecb_yield:
+		case ECB_YIELD:
 			return event;
 		}
 	}
@@ -120,9 +120,9 @@ event_process_not_reenabling(Event * event, void * data)
 	if (event->proc == NULL
 	    || event->proc->leader == NULL
 	    || event->proc->leader->event_handler == NULL)
-		return ecb_deque;
+		return ECB_DEQUE;
 	else
-		return ecb_cont;
+		return ECB_CONT;
 }
 
 static Event *
@@ -188,7 +188,7 @@ next_event(void)
 		 * now) the pain of figuring this out all over again.
 		 * Petr Machata 2011-11-22.  */
 		int i = 0;
-		for (; i < 100 && process_status(pid) != ps_tracing_stop; ++i) {
+		for (; i < 100 && process_status(pid) != PS_TRACING_STOP; ++i) {
 			debug(2, "waiting for %d to stop", pid);
 			usleep(10000);
 		}
@@ -197,9 +197,10 @@ next_event(void)
 		debug(DEBUG_EVENT, "event: NEW: pid=%d", pid);
 		return &event;
 	}
+
 	get_arch_dep(event.proc);
 	debug(3, "event from pid %u", pid);
-	Process *leader = event.proc->leader;
+	struct process *leader = event.proc->leader;
 
 	/* The process should be stopped after the waitpid call.  But
 	 * when the whole thread group is terminated, we see
@@ -313,7 +314,7 @@ next_event(void)
 	   actually seen this on an Itanium machine on RHEL 5, I don't
 	   remember the exact kernel version anymore.  ia64-sigill.s
 	   in the test suite tests this.  Petr Machata 2011-06-08.  */
-	void * break_address
+	arch_addr_t break_address
 		= event.proc->instruction_pointer - DECR_PC_AFTER_BREAK;
 	if ((stop_signal == SIGSEGV || stop_signal == SIGILL)
 	    && leader != NULL
@@ -341,13 +342,13 @@ static enum ecb_status
 event_for_proc(struct Event *event, void *data)
 {
 	if (event->proc == data)
-		return ecb_deque;
+		return ECB_DEQUE;
 	else
-		return ecb_cont;
+		return ECB_CONT;
 }
 
 void
-delete_events_for(struct Process *proc)
+delete_events_for(struct process *proc)
 {
 	struct Event *event;
 	while ((event = each_qd_event(&event_for_proc, proc)) != NULL)
diff --git a/sysdeps/linux-gnu/events.h b/sysdeps/linux-gnu/events.h
index 3802aff..51ef309 100644
--- a/sysdeps/linux-gnu/events.h
+++ b/sysdeps/linux-gnu/events.h
@@ -26,16 +26,16 @@
 /* Declarations for event que functions.  */
 
 enum ecb_status {
-	ecb_cont, /* The iteration should continue.  */
-	ecb_yield, /* The iteration should stop, yielding this
+	ECB_CONT, /* The iteration should continue.  */
+	ECB_YIELD, /* The iteration should stop, yielding this
 		    * event.  */
-	ecb_deque, /* Like ecb_stop, but the event should be removed
+	ECB_DEQUE, /* Like ECB_STOP, but the event should be removed
 		    * from the queue.  */
 };
 
 struct Event *each_qd_event(enum ecb_status (*cb)(struct Event *event,
 						  void *data), void *data);
-void delete_events_for(struct Process * proc);
+void delete_events_for(struct process *proc);
 void enque_event(struct Event *event);
 
 #endif /* SYSDEPS_LINUX_GNU_EVENTS_H */
diff --git a/sysdeps/linux-gnu/hooks.c b/sysdeps/linux-gnu/hooks.c
new file mode 100644
index 0000000..1e375fb
--- /dev/null
+++ b/sysdeps/linux-gnu/hooks.c
@@ -0,0 +1,212 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2012, 2013 Petr Machata
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#define _POSIX_C_SOURCE 200809L
+#include <sys/types.h>
+#include <alloca.h>
+#include <errno.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "backend.h"
+#include "dict.h"
+#include "options.h"
+#include "sysdep.h"
+#include "vect.h"
+
+static char *
+append(const char *str1, const char *str2)
+{
+	char *ret = malloc(strlen(str1) + strlen(str2) + 2);
+	if (ret == NULL)
+		return ret;
+	strcpy(stpcpy(ret, str1), str2);
+	return ret;
+}
+
+static void
+add_dir(struct vect *dirs, const char *str1, const char *str2)
+{
+	char *dir = append(str1, str2);
+	if (dir != NULL
+	    && VECT_PUSHBACK(dirs, &dir) < 0)
+		fprintf(stderr,
+			"Couldn't store candidate config directory %s%s: %s.\n",
+			str1, str2, strerror(errno));
+}
+
+static enum callback_status
+add_dir_component_cb(struct opt_F_t *entry, void *data)
+{
+	struct vect *dirs = data;
+	if (opt_F_get_kind(entry) == OPT_F_DIR)
+		add_dir(dirs, entry->pathname, "/ltrace");
+	return CBS_CONT;
+}
+
+static void
+destroy_opt_F_cb(struct opt_F_t *entry, void *data)
+{
+	opt_F_destroy(entry);
+}
+
+static char *g_home_dir = NULL;
+
+int
+os_get_config_dirs(int private, const char ***retp)
+{
+	/* Vector of char *.  Contains first pointers to local paths,
+	 * then NULL, then pointers to system paths, then another
+	 * NULL.  SYS_START points to the beginning of the second
+	 * part.  */
+	static struct vect dirs;
+	static ssize_t sys_start = 0;
+
+again:
+	if (sys_start != 0) {
+		if (sys_start == -1)
+			return -1;
+
+		if (retp != NULL) {
+			if (private)
+				*retp = VECT_ELEMENT(&dirs, const char *, 0);
+			else
+				*retp = VECT_ELEMENT(&dirs, const char *,
+						     (size_t)sys_start);
+		}
+
+		return 0;
+	}
+
+	VECT_INIT(&dirs, char *);
+
+	char *home = getenv("HOME");
+	if (home == NULL) {
+		struct passwd *pwd = getpwuid(getuid());
+		if (pwd != NULL)
+			home = pwd->pw_dir;
+	}
+
+	size_t home_len = home != NULL ? strlen(home) : 0;
+
+	/* The values coming from getenv and getpwuid may not be
+	 * persistent.  */
+	if (home != NULL) {
+		g_home_dir = strdup(home);
+		if (g_home_dir != NULL) {
+			home = g_home_dir;
+		} else {
+			char *tmp = alloca(home_len + 1);
+			strcpy(tmp, home);
+			home = tmp;
+		}
+	}
+
+	char *xdg_home = getenv("XDG_CONFIG_HOME");
+	if (xdg_home == NULL && home != NULL) {
+		xdg_home = alloca(home_len + sizeof "/.config");
+		sprintf(xdg_home, "%s/.config", home);
+	}
+	if (xdg_home != NULL)
+		add_dir(&dirs, xdg_home, "/ltrace");
+	if (home != NULL)
+		add_dir(&dirs, home, "/.ltrace");
+
+	char *delim = NULL;
+	if (VECT_PUSHBACK(&dirs, &delim) < 0) {
+	fail:
+		/* This can't work :(  */
+		fprintf(stderr,
+			"Couldn't initialize list of config directories: %s.\n",
+			strerror(errno));
+		VECT_DESTROY(&dirs, const char *, dict_dtor_string, NULL);
+		sys_start = -1;
+		return -1;
+	}
+	sys_start = vect_size(&dirs);
+
+	/* """preference-ordered set of base directories to search for
+	 * configuration files in addition to the $XDG_CONFIG_HOME
+	 * base directory. The directories in $XDG_CONFIG_DIRS should
+	 * be seperated with a colon ':'."""  */
+	char *xdg_sys = getenv("XDG_CONFIG_DIRS");
+	if (xdg_sys != NULL) {
+		struct vect v;
+		VECT_INIT(&v, struct opt_F_t);
+		if (parse_colon_separated_list(xdg_sys, &v) < 0
+		    || VECT_EACH(&v, struct opt_F_t, NULL,
+				 add_dir_component_cb, &dirs) != NULL)
+			fprintf(stderr,
+				"Error processing $XDG_CONFIG_DIRS '%s': %s\n",
+				xdg_sys, strerror(errno));
+		VECT_DESTROY(&v, struct opt_F_t, destroy_opt_F_cb, NULL);
+	}
+
+	/* PKGDATADIR is passed via -D when compiling.  */
+	const char *pkgdatadir = PKGDATADIR;
+	if (pkgdatadir != NULL)
+		add_dir(&dirs, pkgdatadir, "");
+
+	if (VECT_PUSHBACK(&dirs, &delim) < 0)
+		goto fail;
+
+	goto again;
+}
+
+int
+os_get_ltrace_conf_filenames(struct vect *retp)
+{
+	char *homepath = NULL;
+	char *syspath = NULL;
+
+#define FN ".ltrace.conf"
+	if (g_home_dir == NULL)
+		os_get_config_dirs(0, NULL);
+
+	if (g_home_dir != NULL) {
+		homepath = malloc(strlen(g_home_dir) + 1 + sizeof FN);
+		if (homepath == NULL
+		    || sprintf(homepath, "%s/%s", g_home_dir, FN) < 0) {
+		fail:
+			free(syspath);
+			free(homepath);
+			return -1;
+		}
+	}
+
+	/* SYSCONFDIR is passed via -D when compiling.  */
+	const char *sysconfdir = SYSCONFDIR;
+	if (sysconfdir != NULL && *sysconfdir != '\0') {
+		/* No +1, we skip the initial period.  */
+		syspath = malloc(strlen(sysconfdir) + sizeof FN);
+		if (syspath == NULL
+		    || sprintf(syspath, "%s/%s", sysconfdir, FN + 1) < 0)
+			goto fail;
+	}
+
+	if (VECT_PUSHBACK(retp, &homepath) < 0
+	    || VECT_PUSHBACK(retp, &syspath) < 0)
+		goto fail;
+
+	return 0;
+}
diff --git a/sysdeps/linux-gnu/ia64/Makefile.in b/sysdeps/linux-gnu/ia64/Makefile.in
deleted file mode 100644
index a4eb305..0000000
--- a/sysdeps/linux-gnu/ia64/Makefile.in
+++ /dev/null
@@ -1,533 +0,0 @@
-# Makefile.in generated by automake 1.11.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# This file is part of ltrace.
-# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-# 02110-1301 USA
-
-
-VPATH = @srcdir@
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-INSTALL_HEADER = $(INSTALL_DATA)
-transform = $(program_transform_name)
-NORMAL_INSTALL = :
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-	$(srcdir)/Makefile.in
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-top_srcdir = @top_srcdir@
-noinst_LTLIBRARIES = \
-	../libcpu.la
-
-___libcpu_la_SOURCES = \
-	breakpoint.c \
-	plt.c \
-	regs.c \
-	trace.c \
-	fetch.c
-
-noinst_HEADERS = \
-	arch.h \
-	ptrace.h \
-	signalent.h \
-	syscallent.h
-
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-	Makefile.in
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-$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
-	@for dep in $?; do \
-	  case '$(am__configure_deps)' in \
-	    *$$dep*) \
-	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
-	        && { if test -f $@; then exit 0; else break; fi; }; \
-	      exit 1;; \
-	  esac; \
-	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign sysdeps/linux-gnu/ia64/Makefile'; \
-	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --foreign sysdeps/linux-gnu/ia64/Makefile
-.PRECIOUS: Makefile
-Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
-	@case '$?' in \
-	  *config.status*) \
-	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
-	  *) \
-	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
-	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
-	esac;
-
-$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
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-	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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-	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
-$(am__aclocal_m4_deps):
-
-clean-noinstLTLIBRARIES:
-	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
-	@list='$(noinst_LTLIBRARIES)'; for p in $$list; do \
-	  dir="`echo $$p | sed -e 's|/[^/]*$$||'`"; \
-	  test "$$dir" != "$$p" || dir=.; \
-	  echo "rm -f \"$${dir}/so_locations\""; \
-	  rm -f "$${dir}/so_locations"; \
-	done
-../$(am__dirstamp):
-	@$(MKDIR_P) ..
-	@: > ../$(am__dirstamp)
-../libcpu.la: $(___libcpu_la_OBJECTS) $(___libcpu_la_DEPENDENCIES) ../$(am__dirstamp)
-	$(LINK)  $(___libcpu_la_OBJECTS) $(___libcpu_la_LIBADD) $(LIBS)
-
-mostlyclean-compile:
-	-rm -f *.$(OBJEXT)
-
-distclean-compile:
-	-rm -f *.tab.c
-
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/breakpoint.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fetch.Plo@am__quote@
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-
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-	mkid -fID $$unique
-tags: TAGS
-
-TAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
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-	here=`pwd`; \
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
-	unique=`for i in $$list; do \
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-	shift; \
-	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
-	  test -n "$$unique" || unique=$$empty_fix; \
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-	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
-	     $$unique
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-	list='$(DISTFILES)'; \
-	  dist_files=`for file in $$list; do echo $$file; done | \
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-	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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-			   sort -u` ;; \
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-	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
-	  else \
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-	    || cp -p $$d/$$file "$(distdir)/$$file" \
-	    || exit 1; \
-	  fi; \
-	done
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-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/sysdeps/linux-gnu/ia64/fetch.c b/sysdeps/linux-gnu/ia64/fetch.c
index 54dc5b8..171c7a2 100644
--- a/sysdeps/linux-gnu/ia64/fetch.c
+++ b/sysdeps/linux-gnu/ia64/fetch.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2008,2009 Juan Cespedes
  * Copyright (C) 2006 Steve Fink
  * Copyright (C) 2006 Ian Wienand
@@ -63,7 +63,7 @@ union cfm_t {
 };
 
 static int
-fetch_context_init(struct Process *proc, struct fetch_context *context)
+fetch_context_init(struct process *proc, struct fetch_context *context)
 {
 	context->slot_n = 0;
 	context->flt = 8;
@@ -76,7 +76,7 @@ fetch_context_init(struct Process *proc, struct fetch_context *context)
 }
 
 struct fetch_context *
-arch_fetch_arg_init(enum tof type, struct Process *proc,
+arch_fetch_arg_init(enum tof type, struct process *proc,
 		    struct arg_type_info *ret_info)
 {
 	struct fetch_context *context = malloc(sizeof(*context));
@@ -91,7 +91,7 @@ arch_fetch_arg_init(enum tof type, struct Process *proc,
 }
 
 struct fetch_context *
-arch_fetch_arg_clone(struct Process *proc,
+arch_fetch_arg_clone(struct process *proc,
 		     struct fetch_context *context)
 {
 	struct fetch_context *clone = malloc(sizeof(*context));
@@ -102,7 +102,7 @@ arch_fetch_arg_clone(struct Process *proc,
 }
 
 int
-allocate_stack_slot(struct fetch_context *ctx, struct Process *proc,
+allocate_stack_slot(struct fetch_context *ctx, struct process *proc,
 		    struct arg_type_info *info, struct value *valuep)
 {
 	size_t al = type_alignof(proc, info);
@@ -121,7 +121,7 @@ allocate_stack_slot(struct fetch_context *ctx, struct Process *proc,
 }
 
 static int
-allocate_reg(struct fetch_context *ctx, struct Process *proc,
+allocate_reg(struct fetch_context *ctx, struct process *proc,
 	     struct arg_type_info *info, struct value *valuep)
 {
 	if (ctx->slot_n >= 8)
@@ -152,7 +152,7 @@ allocate_reg(struct fetch_context *ctx, struct Process *proc,
 }
 
 static int
-copy_aggregate_part(struct fetch_context *ctx, struct Process *proc,
+copy_aggregate_part(struct fetch_context *ctx, struct process *proc,
 		    unsigned char *buf, size_t size)
 {
 	size_t slots = (size + 7) / 8;
@@ -176,7 +176,7 @@ copy_aggregate_part(struct fetch_context *ctx, struct Process *proc,
 }
 
 static int
-allocate_arg(struct fetch_context *ctx, struct Process *proc,
+allocate_arg(struct fetch_context *ctx, struct process *proc,
 	     struct arg_type_info *info, struct value *valuep)
 {
 	size_t sz = type_sizeof(proc, info);
@@ -213,7 +213,7 @@ fpreg_to_double (struct ia64_fpreg *fp) {
 }
 
 static int
-allocate_float(struct fetch_context *ctx, struct Process *proc,
+allocate_float(struct fetch_context *ctx, struct process *proc,
 	       struct arg_type_info *info, struct value *valuep,
 	       int take_slot)
 {
@@ -249,39 +249,8 @@ allocate_float(struct fetch_context *ctx, struct Process *proc,
 	return 0;
 }
 
-static enum arg_type
-get_hfa_type(struct arg_type_info *info, size_t *countp)
-{
-	size_t n = type_aggregate_size(info);
-	if (n == (size_t)-1)
-		return ARGTYPE_VOID;
-
-	enum arg_type type = ARGTYPE_VOID;
-	*countp = 0;
-
-	while (n-- > 0) {
-		struct arg_type_info *emt = type_element(info, n);
-
-		enum arg_type emt_type = emt->type;
-		size_t emt_count = 1;
-		if (emt_type == ARGTYPE_STRUCT || emt_type == ARGTYPE_ARRAY)
-			emt_type = get_hfa_type(emt, &emt_count);
-
-		if (type == ARGTYPE_VOID) {
-			if (emt_type != ARGTYPE_FLOAT
-			    && emt_type != ARGTYPE_DOUBLE)
-				return ARGTYPE_VOID;
-			type = emt_type;
-		}
-		if (emt_type != type)
-			return ARGTYPE_VOID;
-		*countp += emt_count;
-	}
-	return type;
-}
-
 static int
-allocate_hfa(struct fetch_context *ctx, struct Process *proc,
+allocate_hfa(struct fetch_context *ctx, struct process *proc,
 	     struct arg_type_info *info, struct value *valuep,
 	     enum arg_type hfa_type, size_t hfa_count)
 {
@@ -366,7 +335,7 @@ allocate_hfa(struct fetch_context *ctx, struct Process *proc,
 }
 
 static int
-allocate_ret(struct fetch_context *ctx, struct Process *proc,
+allocate_ret(struct fetch_context *ctx, struct process *proc,
 	     struct arg_type_info *info, struct value *valuep)
 {
 	size_t sz = type_sizeof(proc, info);
@@ -380,10 +349,11 @@ allocate_ret(struct fetch_context *ctx, struct Process *proc,
 	 * floating-point registers, beginning with f8.  */
 	if (info->type == ARGTYPE_STRUCT || info->type == ARGTYPE_ARRAY) {
 		size_t hfa_size;
-		enum arg_type hfa_type = get_hfa_type(info, &hfa_size);
-		if (hfa_type != ARGTYPE_VOID && hfa_size <= 8)
+		struct arg_type_info *hfa_info
+			= type_get_hfa_type(info, &hfa_size);
+		if (hfa_info != NULL && hfa_size <= 8)
 			return allocate_hfa(ctx, proc, info, valuep,
-					    hfa_type, hfa_size);
+					    hfa_info->type, hfa_size);
 	}
 
 	/* Integers and pointers are passed in r8.  128-bit integers
@@ -405,11 +375,11 @@ allocate_ret(struct fetch_context *ctx, struct Process *proc,
 
 int
 arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
-		    struct Process *proc,
+		    struct process *proc,
 		    struct arg_type_info *info, struct value *valuep)
 {
 	switch (info->type) {
-		enum arg_type hfa_type;
+		struct arg_type_info *hfa_info;
 		size_t hfa_size;
 
 	case ARGTYPE_VOID:
@@ -421,10 +391,10 @@ arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
 		return allocate_float(ctx, proc, info, valuep, 1);
 
 	case ARGTYPE_STRUCT:
-		hfa_type = get_hfa_type(info, &hfa_size);
-		if (hfa_type != ARGTYPE_VOID)
+		hfa_info = type_get_hfa_type(info, &hfa_size);
+		if (hfa_info != NULL)
 			return allocate_hfa(ctx, proc, info, valuep,
-					    hfa_type, hfa_size);
+					    hfa_info->type, hfa_size);
 		/* Fall through.  */
 	case ARGTYPE_CHAR:
 	case ARGTYPE_SHORT:
@@ -446,7 +416,7 @@ arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
 
 int
 arch_fetch_retval(struct fetch_context *ctx, enum tof type,
-		  struct Process *proc, struct arg_type_info *info,
+		  struct process *proc, struct arg_type_info *info,
 		  struct value *valuep)
 {
 	if (fetch_context_init(proc, ctx) < 0)
diff --git a/sysdeps/linux-gnu/ia64/plt.c b/sysdeps/linux-gnu/ia64/plt.c
index a29488f..f6bc939 100644
--- a/sysdeps/linux-gnu/ia64/plt.c
+++ b/sysdeps/linux-gnu/ia64/plt.c
@@ -68,12 +68,13 @@ arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela)
 }
 
 void *
-sym2addr(Process *proc, struct library_symbol *sym) {
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
 	return sym->enter_addr;
 }
 
 int
-arch_translate_address_dyn(struct Process *proc,
+arch_translate_address_dyn(struct process *proc,
 			   arch_addr_t addr, arch_addr_t *ret)
 {
 	errno = 0;
diff --git a/sysdeps/linux-gnu/ia64/regs.c b/sysdeps/linux-gnu/ia64/regs.c
index cbc2744..67873ce 100644
--- a/sysdeps/linux-gnu/ia64/regs.c
+++ b/sysdeps/linux-gnu/ia64/regs.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2011,2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2008,2009 Juan Cespedes
  * Copyright (C) 2006 Ian Wienand
  *
@@ -34,7 +34,8 @@
 #include "common.h"
 
 void *
-get_instruction_pointer(Process *proc) {
+get_instruction_pointer(struct process *proc)
+{
 	unsigned long ip = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IIP, 0);
 	unsigned long slot =
 	    (ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0) >> 41) & 3;
@@ -43,7 +44,8 @@ get_instruction_pointer(Process *proc) {
 }
 
 void
-set_instruction_pointer(Process *proc, void *addr) {
+set_instruction_pointer(struct process *proc, void *addr)
+{
 
 	unsigned long newip = (unsigned long)addr;
 	unsigned long slot = (unsigned long)addr & 0xf;
@@ -59,7 +61,8 @@ set_instruction_pointer(Process *proc, void *addr) {
 }
 
 void *
-get_stack_pointer(Process *proc) {
+get_stack_pointer(struct process *proc)
+{
 	long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_R12, 0);
 	if (l == -1 && errno)
 		return NULL;
@@ -67,14 +70,10 @@ get_stack_pointer(Process *proc) {
 }
 
 void *
-get_return_addr(Process *proc, void *stack_pointer) {
+get_return_addr(struct process *proc, void *stack_pointer)
+{
 	long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_B0, 0);
 	if (l == -1 && errno)
 		return NULL;
 	return (void *)l;
 }
-
-void
-set_return_addr(Process *proc, void *addr) {
-	ptrace(PTRACE_POKEUSER, proc->pid, PT_B0, addr);
-}
diff --git a/sysdeps/linux-gnu/ia64/trace.c b/sysdeps/linux-gnu/ia64/trace.c
index e608275..9e554ef 100644
--- a/sysdeps/linux-gnu/ia64/trace.c
+++ b/sysdeps/linux-gnu/ia64/trace.c
@@ -70,7 +70,8 @@ union cfm_t {
 };
 
 int
-syscall_p(Process *proc, int status, int *sysnum) {
+syscall_p(struct process *proc, int status, int *sysnum)
+{
 	if (WIFSTOPPED(status)
 	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
 		long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0);
@@ -141,5 +142,6 @@ syscall_p(Process *proc, int status, int *sysnum) {
 }
 
 void
-get_arch_dep(Process *proc) {
+get_arch_dep(struct process *proc)
+{
 }
diff --git a/sysdeps/linux-gnu/m68k/Makefile.in b/sysdeps/linux-gnu/m68k/Makefile.in
deleted file mode 100644
index 45eebd3..0000000
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diff --git a/sysdeps/linux-gnu/m68k/fetch.c b/sysdeps/linux-gnu/m68k/fetch.c
index f6d8a0b..24bd8f0 100644
--- a/sysdeps/linux-gnu/m68k/fetch.c
+++ b/sysdeps/linux-gnu/m68k/fetch.c
@@ -43,7 +43,7 @@ struct fetch_context
 };
 
 static int
-fetch_register_banks(struct Process *proc, struct fetch_context *context,
+fetch_register_banks(struct process *proc, struct fetch_context *context,
 		     int floating)
 {
 	if (ptrace(PTRACE_GETREGS, proc->pid, 0, &context->regs) < 0)
@@ -57,7 +57,7 @@ fetch_register_banks(struct Process *proc, struct fetch_context *context,
 }
 
 struct fetch_context *
-arch_fetch_arg_init(enum tof type, struct Process *proc,
+arch_fetch_arg_init(enum tof type, struct process *proc,
 		    struct arg_type_info *ret_info)
 {
 	struct fetch_context *context = malloc(sizeof(*context));
@@ -92,7 +92,7 @@ arch_fetch_arg_init(enum tof type, struct Process *proc,
 }
 
 struct fetch_context *
-arch_fetch_arg_clone(struct Process *proc, struct fetch_context *context)
+arch_fetch_arg_clone(struct process *proc, struct fetch_context *context)
 {
 	struct fetch_context *ret = malloc(sizeof(*ret));
 	if (ret == NULL)
@@ -103,7 +103,7 @@ arch_fetch_arg_clone(struct Process *proc, struct fetch_context *context)
 
 int
 arch_fetch_arg_next(struct fetch_context *context, enum tof type,
-		    struct Process *proc, struct arg_type_info *info,
+		    struct process *proc, struct arg_type_info *info,
 		    struct value *valuep)
 {
 	size_t sz = type_sizeof(proc, info);
@@ -143,7 +143,7 @@ arch_fetch_arg_next(struct fetch_context *context, enum tof type,
 
 int
 arch_fetch_retval(struct fetch_context *context, enum tof type,
-		  struct Process *proc, struct arg_type_info *info,
+		  struct process *proc, struct arg_type_info *info,
 		  struct value *valuep)
 {
 	if (fetch_register_banks(proc, context, type == LT_TOF_FUNCTIONR) < 0)
diff --git a/sysdeps/linux-gnu/m68k/plt.c b/sysdeps/linux-gnu/m68k/plt.c
index c1b37dd..dcd6878 100644
--- a/sysdeps/linux-gnu/m68k/plt.c
+++ b/sysdeps/linux-gnu/m68k/plt.c
@@ -30,6 +30,7 @@ arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela) {
 }
 
 void *
-sym2addr(Process *proc, struct library_symbol *sym) {
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
 	return sym->enter_addr;
 }
diff --git a/sysdeps/linux-gnu/m68k/regs.c b/sysdeps/linux-gnu/m68k/regs.c
index 4afdfbb..e25aefb 100644
--- a/sysdeps/linux-gnu/m68k/regs.c
+++ b/sysdeps/linux-gnu/m68k/regs.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 1998,2002,2004,2008,2009 Juan Cespedes
  *
  * This program is free software; you can redistribute it and/or
@@ -36,26 +37,25 @@
 #endif
 
 void *
-get_instruction_pointer(Process *proc) {
+get_instruction_pointer(struct process *proc)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_PC, 0);
 }
 
 void
-set_instruction_pointer(Process *proc, void *addr) {
+set_instruction_pointer(struct process *proc, void *addr)
+{
 	ptrace(PTRACE_POKEUSER, proc->pid, 4 * PT_PC, addr);
 }
 
 void *
-get_stack_pointer(Process *proc) {
+get_stack_pointer(struct process *proc)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_USP, 0);
 }
 
 void *
-get_return_addr(Process *proc, void *stack_pointer) {
+get_return_addr(struct process *proc, void *stack_pointer)
+{
 	return (void *)ptrace(PTRACE_PEEKTEXT, proc->pid, stack_pointer, 0);
 }
-
-void
-set_return_addr(Process *proc, void *addr) {
-	ptrace(PTRACE_POKETEXT, proc->pid, proc->stack_pointer, addr);
-}
diff --git a/sysdeps/linux-gnu/m68k/trace.c b/sysdeps/linux-gnu/m68k/trace.c
index 311ffd5..01b5253 100644
--- a/sysdeps/linux-gnu/m68k/trace.c
+++ b/sysdeps/linux-gnu/m68k/trace.c
@@ -40,13 +40,15 @@
 #endif
 
 void
-get_arch_dep(Process *proc) {
+get_arch_dep(struct process *proc)
+{
 }
 
 /* Returns 1 if syscall, 2 if sysret, 0 otherwise.
  */
 int
-syscall_p(Process *proc, int status, int *sysnum) {
+syscall_p(struct process *proc, int status, int *sysnum)
+{
 	int depth;
 
 	if (WIFSTOPPED(status)
diff --git a/sysdeps/linux-gnu/metag/Makefile.am b/sysdeps/linux-gnu/metag/Makefile.am
new file mode 100644
index 0000000..a79d2f7
--- /dev/null
+++ b/sysdeps/linux-gnu/metag/Makefile.am
@@ -0,0 +1,16 @@
+noinst_LTLIBRARIES = \
+	../libcpu.la
+
+___libcpu_la_SOURCES = \
+	plt.c \
+	regs.c \
+	trace.c
+
+noinst_HEADERS = \
+	arch.h \
+	ptrace.h \
+	signalent.h \
+	syscallent.h
+
+MAINTAINERCLEANFILES = \
+	Makefile.in
diff --git a/sysdeps/linux-gnu/metag/arch.h b/sysdeps/linux-gnu/metag/arch.h
new file mode 100644
index 0000000..2699c62
--- /dev/null
+++ b/sysdeps/linux-gnu/metag/arch.h
@@ -0,0 +1,28 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 1998,2004,2008 Juan Cespedes
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#define LT_ELFCLASS	ELFCLASS32
+#define LT_ELF_MACHINE	EM_METAG
+
+#define BREAKPOINT_VALUE { 0x01, 0x00, 0x40, 0xAF }
+#define BREAKPOINT_LENGTH 4
+#define DECR_PC_AFTER_BREAK 0
+#define ARCH_ENDIAN_LITTLE
+#define ARCH_HAVE_SW_SINGLESTEP
diff --git a/sysdeps/linux-gnu/metag/plt.c b/sysdeps/linux-gnu/metag/plt.c
new file mode 100644
index 0000000..2d479a4
--- /dev/null
+++ b/sysdeps/linux-gnu/metag/plt.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of ltrace.
+ *
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <gelf.h>
+
+#include "debug.h"
+#include "proc.h"
+#include "library.h"
+#include "ltrace-elf.h"
+
+GElf_Addr
+arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela)
+{
+	return lte->plt_addr + ( ndx * 0x14 ) + 0x14;
+}
+
+void
+*sym2addr(struct process *proc, struct library_symbol *sym)
+{
+	return sym->enter_addr;
+}
diff --git a/sysdeps/linux-gnu/metag/ptrace.h b/sysdeps/linux-gnu/metag/ptrace.h
new file mode 100644
index 0000000..7a41e4a
--- /dev/null
+++ b/sysdeps/linux-gnu/metag/ptrace.h
@@ -0,0 +1,21 @@
+/*
+ * This file is part of ltrace.
+ *
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <sys/ptrace.h>
diff --git a/sysdeps/linux-gnu/metag/regs.c b/sysdeps/linux-gnu/metag/regs.c
new file mode 100644
index 0000000..d4a6f2f
--- /dev/null
+++ b/sysdeps/linux-gnu/metag/regs.c
@@ -0,0 +1,89 @@
+/*
+ * This file is part of ltrace.
+ *
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <linux/uio.h>
+#include <asm/ptrace.h>
+
+#include "proc.h"
+#include "common.h"
+
+arch_addr_t
+get_instruction_pointer(struct process *proc)
+{
+	struct user_gp_regs regs;
+	struct iovec iov;
+
+	iov.iov_base = &regs;
+	iov.iov_len = sizeof(regs);
+	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
+		return (void *)-1;
+
+	return (void *)regs.pc; /* PC */
+}
+
+void
+set_instruction_pointer(struct process *proc, arch_addr_t addr)
+{
+	struct user_gp_regs regs;
+	struct iovec iov;
+
+	iov.iov_base = &regs;
+	iov.iov_len = sizeof(regs);
+	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
+		return;
+
+	regs.pc = (unsigned long)addr;
+
+	iov.iov_base = &regs;
+	iov.iov_len = sizeof(regs);
+	ptrace(PTRACE_SETREGSET, proc->pid, NT_PRSTATUS, (long)&iov);
+}
+
+arch_addr_t
+get_stack_pointer(struct process *proc)
+{
+	struct user_gp_regs regs;
+	struct iovec iov;
+
+	iov.iov_base = &regs;
+	iov.iov_len = sizeof(regs);
+	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
+		return (void *)-1;
+
+	return (void *)regs.ax[0][0]; /* A0StP (A0.0) */
+}
+
+arch_addr_t
+get_return_addr(struct process *proc, void *stack_pointer)
+{
+	struct user_gp_regs regs;
+	struct iovec iov;
+
+	iov.iov_base = &regs;
+	iov.iov_len = sizeof(regs);
+	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
+		return (void *)-1;
+
+	return (void *)regs.dx[4][1]; /* D1RtP (D1.4) */
+}
diff --git a/sysdeps/linux-gnu/metag/signalent.h b/sysdeps/linux-gnu/metag/signalent.h
new file mode 100644
index 0000000..80228b7
--- /dev/null
+++ b/sysdeps/linux-gnu/metag/signalent.h
@@ -0,0 +1,53 @@
+/*
+ * This file is part of ltrace.
+ *
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+	"SIG_0",	/* 0 */
+	"SIGHUP",	/* 1 */
+	"SIGINT",	/* 2 */
+	"SIGQUIT",	/* 3 */
+	"SIGILL",	/* 4 */
+	"SIGTRAP",	/* 5 */
+	"SIGABRT",	/* 6 */
+	"SIGBUS",	/* 7 */
+	"SIGFPE",	/* 8 */
+	"SIGKILL",	/* 9 */
+	"SIGUSR1",	/* 10 */
+	"SIGSEGV",	/* 11 */
+	"SIGUSR2",	/* 12 */
+	"SIGPIPE",	/* 13 */
+	"SIGALRM",	/* 14 */
+	"SIGTERM",	/* 15 */
+	"SIGSTKFLT",	/* 16 */
+	"SIGCHLD",	/* 17 */
+	"SIGCONT",	/* 18 */
+	"SIGSTOP",	/* 19 */
+	"SIGTSTP",	/* 20 */
+	"SIGTTIN",	/* 21 */
+	"SIGTTOU",	/* 22 */
+	"SIGURG",	/* 23 */
+	"SIGXCPU",	/* 24 */
+	"SIGXFSZ",	/* 25 */
+	"SIGVTALRM",	/* 26 */
+	"SIGPROF",	/* 27 */
+	"SIGWINCH",	/* 28 */
+	"SIGIO",	/* 29 */
+	"SIGPWR",	/* 30 */
+	"SIGSYS",	/* 31 */
+	"SIGRTMIN",	/* 32 */
diff --git a/sysdeps/linux-gnu/metag/syscallent.h b/sysdeps/linux-gnu/metag/syscallent.h
new file mode 100644
index 0000000..447c550
--- /dev/null
+++ b/sysdeps/linux-gnu/metag/syscallent.h
@@ -0,0 +1,293 @@
+/*
+ * This file is part of ltrace.
+ *
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+	"io_setup",                    /* 0 */
+	"io_destroy",                  /* 1 */
+	"io_submit",                   /* 2 */
+	"io_cancel",                   /* 3 */
+	"io_getevents",                /* 4 */
+	"setxattr",                    /* 5 */
+	"lsetxattr",                   /* 6 */
+	"fsetxattr",                   /* 7 */
+	"getxattr",                    /* 8 */
+	"lgetxattr",                   /* 9 */
+	"fgetxattr",                   /* 10 */
+	"listxattr",                   /* 11 */
+	"llistxattr",                  /* 12 */
+	"flistxattr",                  /* 13 */
+	"removexattr",                 /* 14 */
+	"lremovexattr",                /* 15 */
+	"fremovexattr",                /* 16 */
+	"getcwd",                      /* 17 */
+	"lookup_dcookie",              /* 18 */
+	"eventfd2",                    /* 19 */
+	"epoll_create1",               /* 20 */
+	"epoll_ctl",                   /* 21 */
+	"epoll_pwait",                 /* 22 */
+	"dup",                         /* 23 */
+	"dup3",                        /* 24 */
+	"fcntl64",                     /* 25 */
+	"inotify_init1",               /* 26 */
+	"inotify_add_watch",           /* 27 */
+	"inotify_rm_watch",            /* 28 */
+	"ioctl",                       /* 29 */
+	"ioprio_set",                  /* 30 */
+	"ioprio_get",                  /* 31 */
+	"flock",                       /* 32 */
+	"mknodat",                     /* 33 */
+	"mkdirat",                     /* 34 */
+	"unlinkat",                    /* 35 */
+	"symlinkat",                   /* 36 */
+	"linkat",                      /* 37 */
+	"renameat",                    /* 38 */
+	"umount",                      /* 39 */
+	"mount",                       /* 40 */
+	"pivot_root",                  /* 41 */
+	"42",                          /* 42 */
+	"statfs64",                    /* 43 */
+	"fstatfs64",                   /* 44 */
+	"truncate64",                  /* 45 */
+	"ftruncate64",                 /* 46 */
+	"fallocate",                   /* 47 */
+	"faccessat",                   /* 48 */
+	"chdir",                       /* 49 */
+	"fchdir",                      /* 50 */
+	"chroot",                      /* 51 */
+	"fchmod",                      /* 52 */
+	"fchmodat",                    /* 53 */
+	"fchownat",                    /* 54 */
+	"fchown",                      /* 55 */
+	"openat",                      /* 56 */
+	"close",                       /* 57 */
+	"vhangup",                     /* 58 */
+	"pipe2",                       /* 59 */
+	"quotactl",                    /* 60 */
+	"getdents64",                  /* 61 */
+	"llseek",                      /* 62 */
+	"read",                        /* 63 */
+	"write",                       /* 64 */
+	"readv",                       /* 65 */
+	"writev",                      /* 66 */
+	"pread64",                     /* 67 */
+	"pwrite64",                    /* 68 */
+	"preadv",                      /* 69 */
+	"pwritev",                     /* 70 */
+	"sendfile64",                  /* 71 */
+	"pselect6",                    /* 72 */
+	"ppoll",                       /* 73 */
+	"signalfd4",                   /* 74 */
+	"vmsplice",                    /* 75 */
+	"splice",                      /* 76 */
+	"tee",                         /* 77 */
+	"readlinkat",                  /* 78 */
+	"fstatat64",                   /* 79 */
+	"fstat64",                     /* 80 */
+	"sync",                        /* 81 */
+	"fsync",                       /* 82 */
+	"fdatasync",                   /* 83 */
+	"sync_file_range",             /* 84 */
+	"timerfd_create",              /* 85 */
+	"timerfd_settime",             /* 86 */
+	"timerfd_gettime",             /* 87 */
+	"utimensat",                   /* 88 */
+	"acct",                        /* 89 */
+	"capget",                      /* 90 */
+	"capset",                      /* 91 */
+	"personality",                 /* 92 */
+	"exit",                        /* 93 */
+	"exit_group",                  /* 94 */
+	"waitid",                      /* 95 */
+	"set_tid_address",             /* 96 */
+	"unshare",                     /* 97 */
+	"futex",                       /* 98 */
+	"set_robust_list",             /* 99 */
+	"get_robust_list",             /* 100 */
+	"nanosleep",                   /* 101 */
+	"getitimer",                   /* 102 */
+	"setitimer",                   /* 103 */
+	"kexec_load",                  /* 104 */
+	"init_module",                 /* 105 */
+	"delete_module",               /* 106 */
+	"timer_create",                /* 107 */
+	"timer_gettime",               /* 108 */
+	"timer_getoverrun",            /* 109 */
+	"timer_settime",               /* 110 */
+	"timer_delete",                /* 111 */
+	"clock_settime",               /* 112 */
+	"clock_gettime",               /* 113 */
+	"clock_getres",                /* 114 */
+	"clock_nanosleep",             /* 115 */
+	"syslog",                      /* 116 */
+	"ptrace",                      /* 117 */
+	"sched_setparam",              /* 118 */
+	"sched_setscheduler",          /* 119 */
+	"sched_getscheduler",          /* 120 */
+	"sched_getparam",              /* 121 */
+	"sched_setaffinity",           /* 122 */
+	"sched_getaffinity",           /* 123 */
+	"sched_yield",                 /* 124 */
+	"sched_get_priority_max",      /* 125 */
+	"sched_get_priority_min",      /* 126 */
+	"sched_rr_get_interval",       /* 127 */
+	"restart_syscall",             /* 128 */
+	"kill",                        /* 129 */
+	"tkill",                       /* 130 */
+	"tgkill",                      /* 131 */
+	"sigaltstack",                 /* 132 */
+	"rt_sigsuspend",               /* 133 */
+	"rt_sigaction",                /* 134 */
+	"rt_sigprocmask",              /* 135 */
+	"rt_sigpending",               /* 136 */
+	"rt_sigtimedwait",             /* 137 */
+	"rt_sigqueueinfo",             /* 138 */
+	"rt_sigreturn",                /* 139 */
+	"setpriority",                 /* 140 */
+	"getpriority",                 /* 141 */
+	"reboot",                      /* 142 */
+	"setregid",                    /* 143 */
+	"setgid",                      /* 144 */
+	"setreuid",                    /* 145 */
+	"setuid",                      /* 146 */
+	"setresuid",                   /* 147 */
+	"getresuid",                   /* 148 */
+	"setresgid",                   /* 149 */
+	"getresgid",                   /* 150 */
+	"setfsuid",                    /* 151 */
+	"setfsgid",                    /* 152 */
+	"times",                       /* 153 */
+	"setpgid",                     /* 154 */
+	"getpgid",                     /* 155 */
+	"getsid",                      /* 156 */
+	"setsid",                      /* 157 */
+	"getgroups",                   /* 158 */
+	"setgroups",                   /* 159 */
+	"newuname",                    /* 160 */
+	"sethostname",                 /* 161 */
+	"setdomainname",               /* 162 */
+	"getrlimit",                   /* 163 */
+	"setrlimit",                   /* 164 */
+	"getrusage",                   /* 165 */
+	"umask",                       /* 166 */
+	"prctl",                       /* 167 */
+	"getcpu",                      /* 168 */
+	"gettimeofday",                /* 169 */
+	"settimeofday",                /* 170 */
+	"adjtimex",                    /* 171 */
+	"getpid",                      /* 172 */
+	"getppid",                     /* 173 */
+	"getuid",                      /* 174 */
+	"geteuid",                     /* 175 */
+	"getgid",                      /* 176 */
+	"getegid",                     /* 177 */
+	"gettid",                      /* 178 */
+	"sysinfo",                     /* 179 */
+	"mq_open",                     /* 180 */
+	"mq_unlink",                   /* 181 */
+	"mq_timedsend",                /* 182 */
+	"mq_timedreceive",             /* 183 */
+	"mq_notify",                   /* 184 */
+	"mq_getsetattr",               /* 185 */
+	"msgget",                      /* 186 */
+	"msgctl",                      /* 187 */
+	"msgrcv",                      /* 188 */
+	"msgsnd",                      /* 189 */
+	"semget",                      /* 190 */
+	"semctl",                      /* 191 */
+	"semtimedop",                  /* 192 */
+	"semop",                       /* 193 */
+	"shmget",                      /* 194 */
+	"shmctl",                      /* 195 */
+	"shmat",                       /* 196 */
+	"shmdt",                       /* 197 */
+	"socket",                      /* 198 */
+	"socketpair",                  /* 199 */
+	"bind",                        /* 200 */
+	"listen",                      /* 201 */
+	"accept",                      /* 202 */
+	"connect",                     /* 203 */
+	"getsockname",                 /* 204 */
+	"getpeername",                 /* 205 */
+	"sendto",                      /* 206 */
+	"recvfrom",                    /* 207 */
+	"setsockopt",                  /* 208 */
+	"getsockopt",                  /* 209 */
+	"shutdown",                    /* 210 */
+	"sendmsg",                     /* 211 */
+	"recvmsg",                     /* 212 */
+	"readahead",                   /* 213 */
+	"brk",                         /* 214 */
+	"munmap",                      /* 215 */
+	"mremap",                      /* 216 */
+	"add_key",                     /* 217 */
+	"request_key",                 /* 218 */
+	"keyctl",                      /* 219 */
+	"clone",                       /* 220 */
+	"execve",                      /* 221 */
+	"mmap2",                       /* 222 */
+	"fadvise64_64",                /* 223 */
+	"swapon",                      /* 224 */
+	"swapoff",                     /* 225 */
+	"mprotect",                    /* 226 */
+	"msync",                       /* 227 */
+	"mlock",                       /* 228 */
+	"munlock",                     /* 229 */
+	"mlockall",                    /* 230 */
+	"munlockall",                  /* 231 */
+	"mincore",                     /* 232 */
+	"madvise",                     /* 233 */
+	"remap_file_pages",            /* 234 */
+	"mbind",                       /* 235 */
+	"get_mempolicy",               /* 236 */
+	"set_mempolicy",               /* 237 */
+	"migrate_pages",               /* 238 */
+	"move_pages",                  /* 239 */
+	"rt_tgsigqueueinfo",           /* 240 */
+	"perf_event_open",             /* 241 */
+	"accept4",                     /* 242 */
+	"recvmmsg",                    /* 243 */
+	"244",                         /* 244 */
+	"metag_setglobalbit",          /* 245 */
+	"metag_set_fpu_flags",         /* 246 */
+	"metag_set_tls",               /* 247 */
+	"metag_get_tls",               /* 248 */
+	"249",                         /* 249 */
+	"250",                         /* 250 */
+	"251",                         /* 251 */
+	"252",                         /* 252 */
+	"253",                         /* 253 */
+	"254",                         /* 254 */
+	"255",                         /* 255 */
+	"256",                         /* 256 */
+	"257",                         /* 257 */
+	"258",                         /* 258 */
+	"259",                         /* 259 */
+	"wait4",                       /* 260 */
+	"prlimit64",                   /* 261 */
+	"fanotify_init",               /* 262 */
+	"fanotify_mark",               /* 263 */
+	"name_to_handle_at",           /* 264 */
+	"open_by_handle_at",           /* 265 */
+	"clock_adjtime",               /* 266 */
+	"syncfs",                      /* 267 */
+	"setns",                       /* 268 */
+	"sendmmsg",                    /* 269 */
+	"process_vm_readv",            /* 270 */
+	"process_vm_writev",           /* 271 */
+	"kcmp",                        /* 272 */
diff --git a/sysdeps/linux-gnu/metag/trace.c b/sysdeps/linux-gnu/metag/trace.c
new file mode 100644
index 0000000..ad5fffe
--- /dev/null
+++ b/sysdeps/linux-gnu/metag/trace.c
@@ -0,0 +1,428 @@
+/*
+ * This file is part of ltrace.
+ *
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <sys/ptrace.h>
+#include <linux/uio.h>
+#include <asm/ptrace.h>
+#include <assert.h>
+
+#include "proc.h"
+#include "common.h"
+
+#define METAG_INSN_SIZE	4
+#define N_UNITS 2
+#define REG_SIZE 4
+
+/* unit codes  */
+enum metag_unitnum {
+	METAG_UNIT_CT,       /* 0x0 */
+	METAG_UNIT_D0,
+	METAG_UNIT_D1,
+	METAG_UNIT_A0,
+	METAG_UNIT_A1,       /* 0x4 */
+	METAG_UNIT_PC,
+	METAG_UNIT_RA,
+	METAG_UNIT_TR,
+	METAG_UNIT_TT,       /* 0x8 */
+	METAG_UNIT_FX,
+	METAG_UNIT_MAX,
+};
+
+/**
+    \param proc The process that had an event.
+
+    Called by \c next_event() right after the return from wait.
+ */
+void
+get_arch_dep(struct process *proc)
+{
+
+}
+
+/**
+    \param proc Process that had event.
+    \param status From \c\ waitpid().
+    \param sysnum 0-based syscall number.
+    \return 1 if syscall, 2 if sysret, 0 otherwise.
+
+    Called by \c next_event() after the call to get_arch_dep().
+
+ */
+int
+syscall_p(struct process *proc, int status, int *sysnum)
+{
+	if (WIFSTOPPED(status)
+	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
+		struct user_gp_regs regs;
+		struct iovec iov;
+
+		/* Get GP registers.  */
+		iov.iov_base = &regs;
+		iov.iov_len = sizeof(regs);
+		if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS,
+			   (long)&iov))
+			return -1;
+
+		/* Fetch the SWITCH instruction.  */
+		unsigned int insn = ptrace(PTRACE_PEEKTEXT, proc->pid, regs.pc,
+					   0);
+		*sysnum = regs.dx[0][1];
+
+		if (insn != 0xaf440001) {
+			/* Check if we're returning from the system call.  */
+			insn = ptrace(PTRACE_PEEKTEXT, proc->pid, regs.pc - 4,
+				      0);
+			if (insn == 0xaf440001)
+				return 2;
+
+			return 0;
+		}
+
+		if (*sysnum >= 0)
+			return 1;
+	}
+	return 0;
+}
+
+/* 2-bit base unit (BU) mapping.  */
+static enum metag_unitnum metag_bu_map[4] = {
+	METAG_UNIT_A1,
+	METAG_UNIT_D0,
+	METAG_UNIT_D1,
+	METAG_UNIT_A0,
+};
+
+static int
+get_regval_from_unit(enum metag_unitnum unit, unsigned int reg,
+		     struct user_gp_regs *regs)
+{
+	/*
+	 * Check if reg has a sane value.
+	 * We do have N_UNITS, each one having X registers
+	 * and each register is REG_SIZE bytes.
+	 */
+	if ((unit == METAG_UNIT_A0) || (unit == METAG_UNIT_A1)) {
+		if (reg >= ((sizeof(regs->ax)/N_UNITS/REG_SIZE)))
+			goto bad_reg;
+	} else if ((unit == METAG_UNIT_D0) || (unit == METAG_UNIT_D1)) {
+		if (reg >= ((sizeof(regs->dx)/N_UNITS/REG_SIZE)))
+			goto bad_reg;
+	}
+
+	switch(unit) {
+	case METAG_UNIT_A1:
+		return regs->ax[reg][1];
+	case METAG_UNIT_D0:
+		return regs->dx[reg][0];
+	case METAG_UNIT_D1:
+		return regs->dx[reg][1];
+	case METAG_UNIT_A0:
+		return regs->ax[reg][0];
+	/* We really shouldn't be here.  */
+	default:
+		assert(unit != unit);
+		abort();
+	}
+	return 0;
+
+bad_reg:
+	fprintf(stderr,
+		"Reading from register %d of unit %d is not implemented.",
+		reg, unit);
+	return 0;
+
+}
+
+static int
+metag_next_pcs(struct process *proc, uint32_t pc, uint32_t *newpc)
+{
+	uint32_t inst;
+	int nr = 0, imm, reg_val;
+	unsigned int unit = 0, reg;
+	struct user_gp_regs regs;
+	struct iovec iov;
+
+	inst = ptrace(PTRACE_PEEKTEXT, proc->pid, pc, 0);
+
+	if (inst == 0xa0fffffe) { /* NOP (Special branch instruction) */
+		newpc[nr++] = pc + 4;
+	} else if ((inst & 0xff000000) == 0xa0000000) {
+		/* Matching 0xA 0x0 for opcode for B #S19 or B<cc> #S19.
+		 *
+		 * Potential Targets:
+		 * - pc + #S19 * METAG_INSN_SIZE if R=1 or <CC> true
+		 * - pc + 4  */
+		imm = ((inst << 8) >> 13) * METAG_INSN_SIZE;
+		newpc[nr++] = pc + imm;
+		newpc[nr++] = pc + 4;
+	} else if ((inst & 0xff000000) == 0xac000000) {
+		/* Matching 0xA 0xC for opcode.
+		 * JUMP BBx.r,#X16 or CALL BBx.r,#X16
+		 *
+		 * pc = reg + #x16 (aligned)  */
+		imm = (inst >> 3) & 0xffff;
+		reg = (inst >> 19) & 0x1f;
+		unit = metag_bu_map[inst & 0x3];
+		iov.iov_base = &regs;
+		iov.iov_len = sizeof(regs);
+		if (ptrace(PTRACE_GETREGSET, proc->pid,
+			   NT_PRSTATUS, (long)&iov))
+			goto ptrace_fail;
+
+		reg_val = get_regval_from_unit(unit, reg, &regs);
+		newpc[nr++] = (reg_val + imm) & -METAG_INSN_SIZE;
+	} else if ((inst & 0xff000000) == 0xab000000) {
+		/* Matching 0xA 0xB for opcode.
+		 *
+		 * CALLR BBx.r,#S19  */
+		imm = ((inst << 8) >> 13) * METAG_INSN_SIZE;
+		newpc[nr++] = pc + imm;
+	} else if ((inst & 0xff0001e0) == 0xa30000a0) {
+		/*
+		 * Matching 0xA 0x3 for opcode and then
+		 * Ud (bit 8-5) = 0x5 = METAG_UNIT_PC
+		 *
+		 * Potential MOV PC,.. or SWAP<cc> PC,.. or SWAP<cc> ..,PC
+		 */
+
+		iov.iov_base = &regs;
+		iov.iov_len = sizeof(regs);
+		if (ptrace(PTRACE_GETREGSET, proc->pid,
+			   NT_PRSTATUS, (long)&iov))
+			goto ptrace_fail;
+
+		/*
+		 * Maybe PC is the source register for a SWAP?
+		 * bit9 = 1 and bit13-10(Us) == METAG_UNIT_PC
+		 */
+		if (((inst >> 9 ) & 0x1) &&
+		    (((inst >> 10) & 0xf) == METAG_UNIT_PC)) {
+			/* PC will get its value from the
+			 * destination register.  */
+			reg = (inst >> 14) & 0x1f;
+			unit = (inst >> 5) & 0xf;
+		} else { /* PC is the destination register. 
+			  * Find the source register.  */
+			reg = (inst >> 19) & 0x1f;
+			unit = (inst >> 10) & 0xf;
+		}
+
+		switch(unit) {
+		case METAG_UNIT_D0:
+		case METAG_UNIT_D1:
+		case METAG_UNIT_A0:
+		case METAG_UNIT_A1:
+			reg_val = get_regval_from_unit(unit, reg, &regs);
+			break;
+		case METAG_UNIT_PC:
+			reg_val = regs.pc;
+			break;
+		default:
+			goto unhandled;
+		}
+		newpc[nr++] = reg_val;
+		/* In case it is a conditional instruction.  */
+		newpc[nr++] = pc + 4;
+	} else if ((inst & 0xff00001f) == 0xc600000a){
+		/* Matching 0xC 0x{4,6} for opcode
+		 * and UD == 0x5 == METAG_UNIT_PC
+		 *
+		 * GETD PC, [A0.r + #S6] or
+		 * GETD PC, [A0.r + A0.r]  */
+		unit = metag_bu_map[(inst >> 5) & 0x3];
+		iov.iov_base = &regs;
+		iov.iov_len = sizeof(regs);
+		reg = (inst >> 14) & 0x1f;
+		imm = (inst << 18) >> 5; /* sign-extend it */
+		if (ptrace(PTRACE_GETREGSET, proc->pid,
+			   NT_PRSTATUS, (long)&iov))
+			goto ptrace_fail;
+		reg_val = get_regval_from_unit(unit, reg, &regs) + imm;
+		/* See where reg_val actually points to.  */
+		newpc[nr++] = ptrace(PTRACE_PEEKTEXT, proc->pid, reg_val, 0);
+	} else if (((inst & 0xfe0001e0) == 0x840000a0) || /* ADDcc R, A, R */
+		   ((inst & 0xfe00003f) == 0x8600002a) || /* ADD R, A, #X8 */
+		   ((inst & 0xfe0001e0) == 0x8c0000a0) || /* SUBcc R, A, R */
+		   ((inst & 0xfe00003f) == 0x8e00002a) || /* SUB R, A, #X8 */
+		   ((inst & 0xf40001e0) == 0x040000a0) || /* ADDcc R, D, D */
+		   ((inst & 0xfe00003f) == 0x0600002a) || /* ADD R, D, #X8 */
+		   ((inst & 0xf40001e0) == 0x140000a0) || /* SUBcc R, D, D */
+		   ((inst & 0xf600003f) == 0x1600002a)) { /* SUB R, D, #X8 */
+
+		/* bits4-1(Ud) == METAG_UNIT_PC */
+
+		int src1, src2, pc_src1 = 0, pc_src2 = 0, is_aunit = 0;
+		int umask = 0, optype = 0;
+
+		/* Look for O2R bit */
+		if ((((inst >> 24) & 0x6) == 0x4) && (inst & 0x1))
+			goto unhandled;
+
+		iov.iov_base = &regs;
+		iov.iov_len = sizeof(regs);
+		if (ptrace(PTRACE_GETREGSET, proc->pid,
+			   NT_PRSTATUS, (long)&iov))
+			goto ptrace_fail;
+
+		/* Figure out unit for source registers based on the opcode.  */
+		switch((inst >> 28) & 0xf) {
+		case 0: /* ADD<cc> Rx.r, Dx.r, De.r|#X8 */
+		case 1: /* SUB<cc> Rx.r, Dx.r, De.r|#X8 */
+			unit = METAG_UNIT_D0 + ((inst >> 24) & 0x1);
+			is_aunit = 0;
+			umask = 0x1f;
+			optype = (inst >> 28) & 0x1;
+			break;
+		case 8:
+			unit = METAG_UNIT_A0 + ((inst >> 24) & 0x1);
+			is_aunit = 1;
+			umask = 0xf;
+			optype = (inst >> 27) & 0x1;
+			break;
+		}
+
+		/* Get pc bits (if any).  */
+		if (is_aunit) {
+			pc_src1 = (inst >> 18) & 0x1;
+			pc_src2 = (inst >> 13) & 0x1;
+		}
+
+		/* Determine ADD|SUB format. Immediate or register ?  */
+		if ((inst >> 25) & 0x1) { /* ADD|SUB cc PC, X, #imm8 */
+			src2 = (inst >> 6) & 0xff; /* so we can share code.  */
+			reg = (inst >> 14) & umask;
+			if (pc_src1)	/* This can only be true for AU ops.  */
+				src1 = regs.pc;
+			else		/* This covers both AU an DU ops.  */
+				src1 = get_regval_from_unit(unit, reg, &regs);
+		} else { /* ADD|SUB cc PC, X, X */
+			if (pc_src1)
+				src1 = regs.pc;
+			else
+				src1 = get_regval_from_unit(unit, (inst >> 14)
+							    & umask, &regs);
+			if (pc_src2)
+				src2 = regs.pc;
+			else
+				src2 = get_regval_from_unit(unit, (inst >> 9)
+							    & umask, &regs);
+		}
+
+		/* Construct the new PC.  */
+		if (optype)
+			/* SUB */
+			newpc[nr++] = src1 - src2;
+		else 	/* ADD */
+			newpc[nr++] = src1 + src2;
+		/* Conditional instruction so PC may not change.  */
+		newpc[nr++] = pc + 4;
+	} else {
+		newpc[nr++] = pc + 4;
+	}
+
+	if (nr <= 0 || nr > 2)
+		goto fail;
+	if (nr == 2 && newpc[1] == 0)
+		goto fail;
+	
+	return nr;
+
+ptrace_fail:
+	fprintf(stderr, "Failed to read the registers pid=%d @ pc=0x%08x\n",
+		proc->pid, pc);
+	return 0;
+unhandled:
+	fprintf(stderr, "Unhandled instruction: pc=0x%08x, inst=0x%08x\n",
+		pc, inst);
+	return 0;
+fail:
+	fprintf(stderr, "nr=%d pc=0x%08x\n", nr, pc);
+	fprintf(stderr, "newpc=0x%08x 0x%08x\n", newpc[0], newpc[1]);
+	return 0;
+
+}
+
+enum sw_singlestep_status
+arch_sw_singlestep(struct process *proc, struct breakpoint *bp,
+		   int (*add_cb)(arch_addr_t, struct sw_singlestep_data *),
+		   struct sw_singlestep_data *add_cb_data)
+{
+	arch_addr_t pc = get_instruction_pointer(proc);
+	uint32_t newpcs[2];
+	int nr;
+
+	nr = metag_next_pcs(proc, (uint32_t)pc, newpcs);
+
+	while (nr-- > 0) {
+		arch_addr_t baddr = (arch_addr_t) newpcs[nr];
+		if (dict_find(proc->leader->breakpoints, &baddr) != NULL) {
+			fprintf(stderr, "skip %p %p\n", baddr, add_cb_data);
+			continue;
+		}
+
+		if (add_cb(baddr, add_cb_data) < 0)
+			return SWS_FAIL;
+	}
+
+	ptrace(PTRACE_SYSCALL, proc->pid, 0, 0);
+	return SWS_OK;
+}
+
+long
+gimme_arg(enum tof type, struct process *proc, int arg_num,
+	  struct arg_type_info *info)
+{
+	long ret;
+	struct user_gp_regs regs;
+	struct iovec iov;
+
+	/* get GP registers */
+	iov.iov_base = &regs;
+	iov.iov_len = sizeof(regs);
+	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
+		return 0;
+
+	debug(2, "type %d arg %d arg",type, arg_num);
+	if (type == LT_TOF_FUNCTION || type == LT_TOF_SYSCALL) {
+		if (arg_num < 6) {
+			/* Args go backwards starting from D1Ar1 (D1.3) */
+			ret = ((unsigned long *)&regs.dx[3][1])[-arg_num];
+			debug(2,"ret = %#lx",ret);
+			return ret;
+		} else {
+			return 0;
+		}
+	}
+	if (arg_num >= 0) {
+		fprintf(stderr,"args on return?");
+	}
+	if (type == LT_TOF_FUNCTIONR || type == LT_TOF_SYSCALLR) {
+		return regs.dx[0][0]; /* D0Re0 (D0.0) */
+	}
+
+	fprintf(stderr, "gimme_arg called with wrong arguments\n");
+
+	return 0;
+}
diff --git a/sysdeps/linux-gnu/mipsel/Doxyfile b/sysdeps/linux-gnu/mips/Doxyfile
index 165f929..1dda2c1 100644
--- a/sysdeps/linux-gnu/mipsel/Doxyfile
+++ b/sysdeps/linux-gnu/mips/Doxyfile
@@ -21,9 +21,9 @@
 #---------------------------------------------------------------------------
 # Project related configuration options
 #---------------------------------------------------------------------------
-PROJECT_NAME           = ltrace-mipsel
-PROJECT_NUMBER         = 
-OUTPUT_DIRECTORY       = 
+PROJECT_NAME           = ltrace-mips
+PROJECT_NUMBER         =
+OUTPUT_DIRECTORY       =
 CREATE_SUBDIRS         = NO
 OUTPUT_LANGUAGE        = English
 USE_WINDOWS_ENCODING   = NO
@@ -43,8 +43,8 @@ ABBREVIATE_BRIEF       = "The $name class" \
 ALWAYS_DETAILED_SEC    = NO
 INLINE_INHERITED_MEMB  = NO
 FULL_PATH_NAMES        = YES
-STRIP_FROM_PATH        = 
-STRIP_FROM_INC_PATH    = 
+STRIP_FROM_PATH        =
+STRIP_FROM_INC_PATH    =
 SHORT_NAMES            = NO
 JAVADOC_AUTOBRIEF      = NO
 MULTILINE_CPP_IS_BRIEF = NO
@@ -52,7 +52,7 @@ DETAILS_AT_TOP         = NO
 INHERIT_DOCS           = YES
 SEPARATE_MEMBER_PAGES  = NO
 TAB_SIZE               = 8
-ALIASES                = 
+ALIASES                =
 OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO
 BUILTIN_STL_SUPPORT    = NO
@@ -82,11 +82,11 @@ GENERATE_TODOLIST      = YES
 GENERATE_TESTLIST      = YES
 GENERATE_BUGLIST       = YES
 GENERATE_DEPRECATEDLIST= YES
-ENABLED_SECTIONS       = 
+ENABLED_SECTIONS       =
 MAX_INITIALIZER_LINES  = 30
 SHOW_USED_FILES        = YES
 SHOW_DIRECTORIES       = NO
-FILE_VERSION_FILTER    = 
+FILE_VERSION_FILTER    =
 #---------------------------------------------------------------------------
 # configuration options related to warning and progress messages
 #---------------------------------------------------------------------------
@@ -96,7 +96,7 @@ WARN_IF_UNDOCUMENTED   = YES
 WARN_IF_DOC_ERROR      = YES
 WARN_NO_PARAMDOC       = NO
 WARN_FORMAT            = "$file:$line: $text"
-WARN_LOGFILE           = 
+WARN_LOGFILE           =
 #---------------------------------------------------------------------------
 # configuration options related to the input files
 #---------------------------------------------------------------------------
@@ -143,15 +143,15 @@ FILE_PATTERNS          = *.c \
                          *.MM \
                          *.PY
 RECURSIVE              = NO
-EXCLUDE                = 
+EXCLUDE                =
 EXCLUDE_SYMLINKS       = NO
-EXCLUDE_PATTERNS       = 
-EXAMPLE_PATH           = 
+EXCLUDE_PATTERNS       =
+EXAMPLE_PATH           =
 EXAMPLE_PATTERNS       = *
 EXAMPLE_RECURSIVE      = NO
-IMAGE_PATH             = 
-INPUT_FILTER           = 
-FILTER_PATTERNS        = 
+IMAGE_PATH             =
+INPUT_FILTER           =
+FILTER_PATTERNS        =
 FILTER_SOURCE_FILES    = NO
 #---------------------------------------------------------------------------
 # configuration options related to source browsing
@@ -169,20 +169,20 @@ VERBATIM_HEADERS       = YES
 #---------------------------------------------------------------------------
 ALPHABETICAL_INDEX     = NO
 COLS_IN_ALPHA_INDEX    = 5
-IGNORE_PREFIX          = 
+IGNORE_PREFIX          =
 #---------------------------------------------------------------------------
 # configuration options related to the HTML output
 #---------------------------------------------------------------------------
 GENERATE_HTML          = YES
 HTML_OUTPUT            = html
 HTML_FILE_EXTENSION    = .html
-HTML_HEADER            = 
-HTML_FOOTER            = 
-HTML_STYLESHEET        = 
+HTML_HEADER            =
+HTML_FOOTER            =
+HTML_STYLESHEET        =
 HTML_ALIGN_MEMBERS     = YES
 GENERATE_HTMLHELP      = NO
-CHM_FILE               = 
-HHC_LOCATION           = 
+CHM_FILE               =
+HHC_LOCATION           =
 GENERATE_CHI           = NO
 BINARY_TOC             = NO
 TOC_EXPAND             = NO
@@ -199,8 +199,8 @@ LATEX_CMD_NAME         = latex
 MAKEINDEX_CMD_NAME     = makeindex
 COMPACT_LATEX          = NO
 PAPER_TYPE             = a4wide
-EXTRA_PACKAGES         = 
-LATEX_HEADER           = 
+EXTRA_PACKAGES         =
+LATEX_HEADER           =
 PDF_HYPERLINKS         = NO
 USE_PDFLATEX           = NO
 LATEX_BATCHMODE        = NO
@@ -212,8 +212,8 @@ GENERATE_RTF           = NO
 RTF_OUTPUT             = rtf
 COMPACT_RTF            = NO
 RTF_HYPERLINKS         = NO
-RTF_STYLESHEET_FILE    = 
-RTF_EXTENSIONS_FILE    = 
+RTF_STYLESHEET_FILE    =
+RTF_EXTENSIONS_FILE    =
 #---------------------------------------------------------------------------
 # configuration options related to the man page output
 #---------------------------------------------------------------------------
@@ -226,8 +226,8 @@ MAN_LINKS              = NO
 #---------------------------------------------------------------------------
 GENERATE_XML           = NO
 XML_OUTPUT             = xml
-XML_SCHEMA             = 
-XML_DTD                = 
+XML_SCHEMA             =
+XML_DTD                =
 XML_PROGRAMLISTING     = YES
 #---------------------------------------------------------------------------
 # configuration options for the AutoGen Definitions output
@@ -239,29 +239,29 @@ GENERATE_AUTOGEN_DEF   = NO
 GENERATE_PERLMOD       = NO
 PERLMOD_LATEX          = NO
 PERLMOD_PRETTY         = YES
-PERLMOD_MAKEVAR_PREFIX = 
+PERLMOD_MAKEVAR_PREFIX =
 #---------------------------------------------------------------------------
-# Configuration options related to the preprocessor   
+# Configuration options related to the preprocessor
 #---------------------------------------------------------------------------
 ENABLE_PREPROCESSING   = YES
 MACRO_EXPANSION        = NO
 EXPAND_ONLY_PREDEF     = NO
 SEARCH_INCLUDES        = YES
-INCLUDE_PATH           = 
-INCLUDE_FILE_PATTERNS  = 
-PREDEFINED             = 
-EXPAND_AS_DEFINED      = 
+INCLUDE_PATH           =
+INCLUDE_FILE_PATTERNS  =
+PREDEFINED             =
+EXPAND_AS_DEFINED      =
 SKIP_FUNCTION_MACROS   = YES
 #---------------------------------------------------------------------------
-# Configuration::additions related to external references   
+# Configuration::additions related to external references
 #---------------------------------------------------------------------------
-TAGFILES               = 
-GENERATE_TAGFILE       = 
+TAGFILES               =
+GENERATE_TAGFILE       =
 ALLEXTERNALS           = NO
 EXTERNAL_GROUPS        = YES
 PERL_PATH              = /usr/bin/perl
 #---------------------------------------------------------------------------
-# Configuration options related to the dot tool   
+# Configuration options related to the dot tool
 #---------------------------------------------------------------------------
 CLASS_DIAGRAMS         = YES
 HIDE_UNDOC_RELATIONS   = YES
@@ -278,8 +278,8 @@ CALLER_GRAPH           = YES
 GRAPHICAL_HIERARCHY    = YES
 DIRECTORY_GRAPH        = YES
 DOT_IMAGE_FORMAT       = png
-DOT_PATH               = 
-DOTFILE_DIRS           = 
+DOT_PATH               =
+DOTFILE_DIRS           =
 MAX_DOT_GRAPH_WIDTH    = 1024
 MAX_DOT_GRAPH_HEIGHT   = 1024
 MAX_DOT_GRAPH_DEPTH    = 1000
@@ -288,6 +288,6 @@ DOT_MULTI_TARGETS      = NO
 GENERATE_LEGEND        = YES
 DOT_CLEANUP            = NO
 #---------------------------------------------------------------------------
-# Configuration::additions related to the search engine   
+# Configuration::additions related to the search engine
 #---------------------------------------------------------------------------
 SEARCHENGINE           = NO
diff --git a/sysdeps/linux-gnu/mipsel/Makefile.am b/sysdeps/linux-gnu/mips/Makefile.am
index 9cf8f19..1fd8c2a 100644
--- a/sysdeps/linux-gnu/mipsel/Makefile.am
+++ b/sysdeps/linux-gnu/mips/Makefile.am
@@ -26,7 +26,7 @@ ___libcpu_la_SOURCES = \
 
 noinst_HEADERS = \
 	arch.h \
-	mipsel.h \
+	mips.h \
 	ptrace.h \
 	signalent.h \
 	syscallent.h
diff --git a/sysdeps/linux-gnu/mipsel/arch.h b/sysdeps/linux-gnu/mips/arch.h
index 684b546..14572cd 100644
--- a/sysdeps/linux-gnu/mipsel/arch.h
+++ b/sysdeps/linux-gnu/mips/arch.h
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata
  * Copyright (C) 2006 Eric Vaitl
  *
  * This program is free software; you can redistribute it and/or
@@ -24,10 +25,18 @@
 #include <stddef.h>
 #include <gelf.h>
 
-#define BREAKPOINT_VALUE { 0x0d, 0x00, 0x00, 0x00 }
+#ifdef __MIPSEL__
+# define BREAKPOINT_VALUE { 0x0d, 0x00, 0x00, 0x00 }
+# define ARCH_ENDIAN_LITTLE
+#elif defined(__MIPSEB__)
+# define BREAKPOINT_VALUE { 0x00, 0x00, 0x00, 0x0d }
+# define ARCH_ENDIAN_BIG
+#else
+# error __MIPSEL__ or __MIPSEB__ must be defined
+#endif
+
 #define BREAKPOINT_LENGTH 4
 #define DECR_PC_AFTER_BREAK 0
-#define ARCH_ENDIAN_LITTLE
 
 #define LT_ELFCLASS	ELFCLASS32
 #define LT_ELF_MACHINE	EM_MIPS
@@ -43,7 +52,7 @@ struct arch_ltelf_data {
 #define ARCH_HAVE_GET_SYMINFO
 #define ARCH_HAVE_DYNLINK_DONE
 #define ARCH_HAVE_ADD_PLT_ENTRY
-#define ARCH_HAVE_ATOMIC_SINGLESTEP
+#define ARCH_HAVE_SW_SINGLESTEP
 #define ARCH_HAVE_SYMBOL_RET
 
 #define ARCH_HAVE_LIBRARY_SYMBOL_DATA
diff --git a/sysdeps/linux-gnu/mipsel/mipsel.h b/sysdeps/linux-gnu/mips/mips.h
index a2dbda2..0cbc715 100644
--- a/sysdeps/linux-gnu/mipsel/mipsel.h
+++ b/sysdeps/linux-gnu/mips/mips.h
@@ -19,15 +19,15 @@
  * 02110-1301 USA
  */
 
-#ifndef MIPSEL_h
-#define  MIPSEL_h
+#ifndef MIPS_h
+#define  MIPS_h
 // asm/ptrace.h for these offsets.
 #define off_v0 2
 #define off_pc 64
 #define off_a0 4
 #define off_a3 7
 #define off_lr 31
-#define off_fpr0 32 
+#define off_fpr0 32
 #define off_sp 29
 
-#endif //  MIPSEL_h
+#endif //  MIPS_h
diff --git a/sysdeps/linux-gnu/mipsel/plt.c b/sysdeps/linux-gnu/mips/plt.c
index b277fbc..3adf2ec 100644
--- a/sysdeps/linux-gnu/mipsel/plt.c
+++ b/sysdeps/linux-gnu/mips/plt.c
@@ -1,7 +1,7 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2012 Edgar E. Iglesias, Axis Communications
- * Copyright (C) 2012 Petr Machata, Red Hat Inc.
  * Copyright (C) 2008,2009 Juan Cespedes
  * Copyright (C) 2006 Eric Vaitl, Cisco Systems, Inc.
  *
@@ -35,7 +35,7 @@
 #include "backend.h"
 
 /**
-   \addtogroup mipsel
+   \addtogroup mips
    @{
  */
 
@@ -104,7 +104,8 @@ arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela *rela)
    breakpoint changes I just add a new breakpoint for the new address.
  */
 void *
-sym2addr(Process *proc, struct library_symbol *sym) {
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
     long ret;
 
     if (sym->arch.pltalways
@@ -125,7 +126,7 @@ sym2addr(Process *proc, struct library_symbol *sym) {
 /* Address of run time loader map, used for debugging.  */
 #define DT_MIPS_RLD_MAP         0x70000016
 int
-arch_find_dl_debug(struct Process *proc, arch_addr_t dyn_addr,
+arch_find_dl_debug(struct process *proc, arch_addr_t dyn_addr,
 		   arch_addr_t *ret)
 {
 	arch_addr_t rld_addr;
@@ -156,24 +157,21 @@ int
 arch_get_sym_info(struct ltelf *lte, const char *filename,
 		  size_t sym_index, GElf_Rela *rela, GElf_Sym *sym)
 {
-	const char *name;
-
 	if (mips_elf_is_cpic(lte->ehdr.e_flags)) {
-		return elf_get_sym_info(lte, filename, sym_index, rela, sym);
+		return gelf_getsym(lte->dynsym, ELF64_R_SYM(rela->r_info),
+				   sym) != NULL ? 0 : -1;
 	}
 
 	/* Fixup the offset.  */
 	sym_index += lte->arch.mips_gotsym;
 
-	if (gelf_getsym(lte->dynsym, sym_index, sym) == NULL){
-		error(EXIT_FAILURE, 0,
-			"Couldn't get relocation from \"%s\"", filename);
-	}
+	if (gelf_getsym(lte->dynsym, sym_index, sym) == NULL)
+		return -1;
 
-	name = lte->dynstr + sym->st_name;
 	if (ELF64_ST_TYPE(sym->st_info) != STT_FUNC) {
+		const char *name = lte->dynstr + sym->st_name;
 		debug(2, "sym %s not a function", name);
-		return -1;
+		return 1;
 	}
 
 	return 0;
@@ -251,11 +249,11 @@ arch_elf_destroy(struct ltelf *lte)
 
 /* When functions return we check if the symbol needs an updated
    breakpoint with the resolved address.  */
-void arch_symbol_ret(struct Process *proc, struct library_symbol *libsym)
+void arch_symbol_ret(struct process *proc, struct library_symbol *libsym)
 {
 	struct breakpoint *bp;
 	arch_addr_t resolved_addr;
-	struct Process *leader = proc->leader;
+	struct process *leader = proc->leader;
 
 	/* Only deal with unresolved symbols.  */
 	if (libsym->arch.type != MIPS_PLT_UNRESOLVED)
@@ -302,7 +300,7 @@ err:
 static enum callback_status
 cb_enable_breakpoint_sym(struct library_symbol *libsym, void *data)
 {
-	struct Process *proc = data;
+	struct process *proc = data;
 	arch_addr_t bp_addr;
 
 	if (!libsym->arch.gotonly)
@@ -329,19 +327,19 @@ cb_enable_breakpoint_sym(struct library_symbol *libsym, void *data)
 }
 
 static enum callback_status
-cb_enable_breakpoint_lib(struct Process *proc, struct library *lib, void *data)
+cb_enable_breakpoint_lib(struct process *proc, struct library *lib, void *data)
 {
 	library_each_symbol(lib, NULL, cb_enable_breakpoint_sym, proc);
 	return CBS_CONT;
 }
 
-void arch_dynlink_done(struct Process *proc)
+void arch_dynlink_done(struct process *proc)
 {
 	proc_each_library(proc->leader, NULL, cb_enable_breakpoint_lib, NULL);
 }
 
 enum plt_status
-arch_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
+arch_elf_add_plt_entry(struct process *proc, struct ltelf *lte,
                        const char *a_name, GElf_Rela *rela, size_t ndx,
                        struct library_symbol **ret)
 {
@@ -350,7 +348,7 @@ arch_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
 
 	struct library_symbol *libsym = malloc(sizeof(*libsym));
 	if (libsym == NULL)
-		return plt_fail;
+		return PLT_FAIL;
 
 	GElf_Addr addr = arch_plt_sym_val(lte, sym_index, 0);
 
@@ -389,12 +387,12 @@ arch_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
 	}
 
 	*ret = libsym;
-	return plt_ok;
+	return PLT_OK;
 
 fail:
 	free(name);
 	free(libsym);
-	return plt_fail;
+	return PLT_FAIL;
 }
 
 int
diff --git a/sysdeps/linux-gnu/mipsel/ptrace.h b/sysdeps/linux-gnu/mips/ptrace.h
index 00c8673..00c8673 100644
--- a/sysdeps/linux-gnu/mipsel/ptrace.h
+++ b/sysdeps/linux-gnu/mips/ptrace.h
diff --git a/sysdeps/linux-gnu/mipsel/regs.c b/sysdeps/linux-gnu/mips/regs.c
index 8731ac5..b143636 100644
--- a/sysdeps/linux-gnu/mipsel/regs.c
+++ b/sysdeps/linux-gnu/mips/regs.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2008,2009 Juan Cespedes
  * Copyright (C) 2006 Eric Vaitl, Cisco Systems, Inc.
  *
@@ -28,7 +29,7 @@
 
 #include "proc.h"
 #include "common.h"
-#include "mipsel.h"
+#include "mips.h"
 
 #if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
 # define PTRACE_PEEKUSER PTRACE_PEEKUSR
@@ -39,7 +40,7 @@
 #endif
 
 /**
-   \addtogroup mipsel
+   \addtogroup mips
    @{
  */
 
@@ -49,7 +50,8 @@
    \return The current instruction pointer.
  */
 void *
-get_instruction_pointer(Process *proc) {
+get_instruction_pointer(struct process *proc)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_pc, 0);
 }
 
@@ -63,7 +65,8 @@ get_instruction_pointer(Process *proc) {
    we \c continue_process() after a breakpoint. Check if this is OK.
  */
 void
-set_instruction_pointer(Process *proc, void *addr) {
+set_instruction_pointer(struct process *proc, void *addr)
+{
 	ptrace(PTRACE_POKEUSER, proc->pid, off_pc, addr);
 }
 
@@ -72,7 +75,8 @@ set_instruction_pointer(Process *proc, void *addr) {
    \return The current stack pointer.
  */
 void *
-get_stack_pointer(Process *proc) {
+get_stack_pointer(struct process *proc)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_sp, 0);
 }
 
@@ -87,11 +91,7 @@ get_stack_pointer(Process *proc) {
    unused.
  */
 void *
-get_return_addr(Process *proc, void *stack_pointer) {
+get_return_addr(struct process *proc, void *stack_pointer)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_lr, 0);
 }
-
-void
-set_return_addr(Process *proc, void *addr) {
-	ptrace(PTRACE_POKEUSER, proc->pid, off_lr, addr);
-}
diff --git a/sysdeps/linux-gnu/mipsel/signalent.h b/sysdeps/linux-gnu/mips/signalent.h
index d779af5..d779af5 100644
--- a/sysdeps/linux-gnu/mipsel/signalent.h
+++ b/sysdeps/linux-gnu/mips/signalent.h
diff --git a/sysdeps/linux-gnu/mipsel/syscallent.h b/sysdeps/linux-gnu/mips/syscallent.h
index c0e5dd6..c0e5dd6 100644
--- a/sysdeps/linux-gnu/mipsel/syscallent.h
+++ b/sysdeps/linux-gnu/mips/syscallent.h
diff --git a/sysdeps/linux-gnu/mipsel/trace.c b/sysdeps/linux-gnu/mips/trace.c
index db9ec21..88e13ac 100644
--- a/sysdeps/linux-gnu/mipsel/trace.c
+++ b/sysdeps/linux-gnu/mips/trace.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2012 Edgar E. Iglesias, Axis Communications
  * Copyright (C) 2010 Arnaud Patard, Mandriva SA
  * Copyright (C) 2008,2009 Juan Cespedes
@@ -33,7 +34,7 @@
 #include "backend.h"
 #include "common.h"
 #include "debug.h"
-#include "mipsel.h"
+#include "mips.h"
 #include "proc.h"
 #include "type.h"
 
@@ -47,7 +48,7 @@
 
 
 /**
-   \addtogroup mipsel Mipsel specific functions.
+   \addtogroup mips Mips specific functions.
 
    These are the functions that it looks like I need to implement in
    order to get ltrace to work on our target.
@@ -64,7 +65,8 @@
    private data area.
  */
 void
-get_arch_dep(Process *proc) {
+get_arch_dep(struct process *proc)
+{
 }
 
 /**
@@ -77,7 +79,7 @@ get_arch_dep(Process *proc) {
 
    It seems that the ptrace call trips twice on a system call, once
    just before the system call and once when it returns. Both times,
-   the pc points at the instruction just after the mipsel "syscall"
+   the pc points at the instruction just after the mips "syscall"
    instruction.
 
    There are several possiblities for system call sets, each is offset
@@ -85,7 +87,8 @@ get_arch_dep(Process *proc) {
    for the system calls is 4000.
  */
 int
-syscall_p(Process *proc, int status, int *sysnum) {
+syscall_p(struct process *proc, int status, int *sysnum)
+{
 	if (WIFSTOPPED(status)
 			&& WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
 		/* get the user's pc (plus 8) */
@@ -95,7 +98,7 @@ syscall_p(Process *proc, int status, int *sysnum) {
 		int num = ptrace(PTRACE_PEEKTEXT, proc->pid, pc - 8, 0);
 
 		/*
-		   On a mipsel,  syscall looks like:
+		   On a mips,  syscall looks like:
 		   24040fa1    li v0, 0x0fa1   # 4001 --> _exit syscall
 		   0000000c    syscall
 		 */
@@ -141,7 +144,7 @@ mips32_relative_offset (uint32_t inst)
   return ((itype_immediate(inst) ^ 0x8000) - 0x8000) << 2;
 }
 
-int mips_next_pcs(struct Process *proc, uint32_t pc, uint32_t *newpc)
+int mips_next_pcs(struct process *proc, uint32_t pc, uint32_t *newpc)
 {
 	uint32_t inst, rx;
 	int op;
@@ -261,10 +264,10 @@ fail:
 	return 0;
 }
 
-int
-arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
-		       int (*add_cb)(void *addr, void *data),
-		       void *add_cb_data)
+enum sw_singlestep_status
+arch_sw_singlestep(struct process *proc, struct breakpoint *bp,
+		   int (*add_cb)(arch_addr_t, struct sw_singlestep_data *),
+		   struct sw_singlestep_data *add_cb_data)
 {
 	uint32_t pc = (uint32_t) get_instruction_pointer(proc);
 	uint32_t newpcs[2];
@@ -275,17 +278,17 @@ arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
 	while (nr-- > 0) {
 		arch_addr_t baddr = (arch_addr_t) newpcs[nr];
 		/* Not sure what to do here. We've already got a bp?  */
-		if (dict_find_entry(proc->leader->breakpoints, baddr) != NULL) {
+		if (DICT_HAS_KEY(proc->leader->breakpoints, &baddr)) {
 			fprintf(stderr, "skip %p %p\n", baddr, add_cb_data);
 			continue;
 		}
 
 		if (add_cb(baddr, add_cb_data) < 0)
-			return -1;
+			return SWS_FAIL;
 	}
 
 	ptrace(PTRACE_SYSCALL, proc->pid, 0, 0);
-	return 0;
+	return SWS_OK;
 }
 
 /**
@@ -303,7 +306,7 @@ arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
 -   I'm only displaying the first 4 args (Registers a0..a3). Good
    enough for now.
 
-  Mipsel conventions seem to be:
+  Mips conventions seem to be:
 - syscall parameters: r4...r9
 - syscall return: if(!a3){ return v0;} else{ errno=v0;return -1;}
 - function call: r4..r7. Not sure how to get arg number 5.
@@ -317,7 +320,8 @@ I'm not doing any floating point support here.
 
 */
 long
-gimme_arg(enum tof type, Process *proc, int arg_num, struct arg_type_info *info)
+gimme_arg(enum tof type, struct process *proc, int arg_num,
+	  struct arg_type_info *info)
 {
 	long ret;
 	long addr;
diff --git a/sysdeps/linux-gnu/mipsel/Makefile.in b/sysdeps/linux-gnu/mipsel/Makefile.in
deleted file mode 100644
index f0a1b06..0000000
--- a/sysdeps/linux-gnu/mipsel/Makefile.in
+++ /dev/null
@@ -1,532 +0,0 @@
-# Makefile.in generated by automake 1.11.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# This file is part of ltrace.
-# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-# 02110-1301 USA
-
-
-VPATH = @srcdir@
-pkgdatadir = $(datadir)/@PACKAGE@
-pkgincludedir = $(includedir)/@PACKAGE@
-pkglibdir = $(libdir)/@PACKAGE@
-pkglibexecdir = $(libexecdir)/@PACKAGE@
-am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
-install_sh_DATA = $(install_sh) -c -m 644
-install_sh_PROGRAM = $(install_sh) -c
-install_sh_SCRIPT = $(install_sh) -c
-INSTALL_HEADER = $(INSTALL_DATA)
-transform = $(program_transform_name)
-NORMAL_INSTALL = :
-PRE_INSTALL = :
-POST_INSTALL = :
-NORMAL_UNINSTALL = :
-PRE_UNINSTALL = :
-POST_UNINSTALL = :
-build_triplet = @build@
-host_triplet = @host@
-subdir = sysdeps/linux-gnu/mipsel
-DIST_COMMON = $(noinst_HEADERS) $(srcdir)/Makefile.am \
-	$(srcdir)/Makefile.in
-ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
-am__aclocal_m4_deps = $(top_srcdir)/config/m4/libtool.m4 \
-	$(top_srcdir)/config/m4/ltoptions.m4 \
-	$(top_srcdir)/config/m4/ltsugar.m4 \
-	$(top_srcdir)/config/m4/ltversion.m4 \
-	$(top_srcdir)/config/m4/lt~obsolete.m4 \
-	$(top_srcdir)/configure.ac
-am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
-	$(ACLOCAL_M4)
-mkinstalldirs = $(install_sh) -d
-CONFIG_HEADER = $(top_builddir)/config.h
-CONFIG_CLEAN_FILES =
-CONFIG_CLEAN_VPATH_FILES =
-LTLIBRARIES = $(noinst_LTLIBRARIES)
-___libcpu_la_LIBADD =
-am____libcpu_la_OBJECTS = plt.lo regs.lo trace.lo
-___libcpu_la_OBJECTS = $(am____libcpu_la_OBJECTS)
-am__dirstamp = $(am__leading_dot)dirstamp
-DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)
-depcomp = $(SHELL) $(top_srcdir)/config/autoconf/depcomp
-am__depfiles_maybe = depfiles
-am__mv = mv -f
-COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
-	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
-LTCOMPILE = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
-	--mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
-	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
-CCLD = $(CC)
-LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
-	--mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
-	$(LDFLAGS) -o $@
-SOURCES = $(___libcpu_la_SOURCES)
-DIST_SOURCES = $(___libcpu_la_SOURCES)
-HEADERS = $(noinst_HEADERS)
-ETAGS = etags
-CTAGS = ctags
-DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
-ACLOCAL = @ACLOCAL@
-AMTAR = @AMTAR@
-AM_CFLAGS = @AM_CFLAGS@
-AM_CPPFLAGS = @AM_CPPFLAGS@
-AM_LDFLAGS = @AM_LDFLAGS@
-AR = @AR@
-AUTOCONF = @AUTOCONF@
-AUTOHEADER = @AUTOHEADER@
-AUTOMAKE = @AUTOMAKE@
-AWK = @AWK@
-CC = @CC@
-CCDEPMODE = @CCDEPMODE@
-CFLAGS = @CFLAGS@
-CPP = @CPP@
-CPPFLAGS = @CPPFLAGS@
-CYGPATH_W = @CYGPATH_W@
-DEFS = @DEFS@
-DEPDIR = @DEPDIR@
-DLLTOOL = @DLLTOOL@
-DSYMUTIL = @DSYMUTIL@
-DUMPBIN = @DUMPBIN@
-ECHO_C = @ECHO_C@
-ECHO_N = @ECHO_N@
-ECHO_T = @ECHO_T@
-EGREP = @EGREP@
-EXEEXT = @EXEEXT@
-FGREP = @FGREP@
-GREP = @GREP@
-HAVE_VALGRIND = @HAVE_VALGRIND@
-HOST_CPU = @HOST_CPU@
-HOST_OS = @HOST_OS@
-INSTALL = @INSTALL@
-INSTALL_DATA = @INSTALL_DATA@
-INSTALL_PROGRAM = @INSTALL_PROGRAM@
-INSTALL_SCRIPT = @INSTALL_SCRIPT@
-INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
-LD = @LD@
-LDFLAGS = @LDFLAGS@
-LIBOBJS = @LIBOBJS@
-LIBS = @LIBS@
-LIBTOOL = @LIBTOOL@
-LIPO = @LIPO@
-LN_S = @LN_S@
-LTLIBOBJS = @LTLIBOBJS@
-MAINT = @MAINT@
-MAKEINFO = @MAKEINFO@
-MANIFEST_TOOL = @MANIFEST_TOOL@
-MKDIR_P = @MKDIR_P@
-NM = @NM@
-NMEDIT = @NMEDIT@
-OBJDUMP = @OBJDUMP@
-OBJEXT = @OBJEXT@
-OTOOL = @OTOOL@
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-	mkid -fID $$unique
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diff --git a/sysdeps/linux-gnu/mksyscallent_mips b/sysdeps/linux-gnu/mksyscallent_mips
new file mode 100755
index 0000000..f3961b4
--- /dev/null
+++ b/sysdeps/linux-gnu/mksyscallent_mips
@@ -0,0 +1,60 @@
+#!/usr/bin/awk -f
+# This file is part of ltrace.
+# Copyright (C) 2010 Arnaud Patard, Mandriva SA
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+# hack expression to generate arch/syscallent.h from <asm/unistd.h>
+# It reads from stdin and writes to stdout
+# It should work OK on i386,m68k,arm,ia64
+# It does NOT work in mips, s390
+# It is untested in other architectures
+
+BEGIN {
+	max=0;
+	FS="[ \t\n()+]+";
+}
+
+{
+	#debug
+	#printf("/%s/%s/%s/%s/\n", $1, $2, $3, $4);
+	if ($2 ~ /__NR_Linux/ && $3 ~ /4000/) {
+		syscall=1;
+	}
+	if ($2 ~ /__NR_Linux_syscalls/) {
+		syscall=0;
+	}
+	if (syscall && ($1 ~ /^#define$/) && ($2 ~ /^__NR_/)) {
+			SYSCALL[$4]=substr($2,6);
+			if ($4 > max) {
+				max=$4;
+			}
+	}
+}
+
+END {
+	for(i=0; i<=max; i++) {
+		if (!SYSCALL[i]) {
+			SYSCALL[i] = i;
+		}
+		pad = 32 - length(SYSCALL[i]);
+		if (pad<1) {
+			pad=1;
+		}
+		printf("\t\"%s\",%*s/* %d */\n", SYSCALL[i], pad, "", i);
+	}
+}
+
diff --git a/sysdeps/linux-gnu/os.h b/sysdeps/linux-gnu/os.h
index 62bf38b..60fd604 100644
--- a/sysdeps/linux-gnu/os.h
+++ b/sysdeps/linux-gnu/os.h
@@ -23,3 +23,17 @@ struct os_process_data {
 	arch_addr_t debug_addr;
 	int debug_state;
 };
+
+#define OS_HAVE_LIBRARY_SYMBOL_DATA
+struct os_library_symbol_data {
+	unsigned is_ifunc : 1;
+};
+
+#define OS_HAVE_BREAKPOINT_DATA
+struct os_breakpoint_data {
+	/* For breakpoints that track return from IFUNC functions, we
+	 * keep here the IFUNC symbol itself.  */
+	struct library_symbol *ret_libsym;
+};
+
+#define OS_HAVE_ADD_FUNC_ENTRY
diff --git a/sysdeps/linux-gnu/ppc/Makefile.in b/sysdeps/linux-gnu/ppc/Makefile.in
deleted file mode 100644
index bcc9d84..0000000
--- a/sysdeps/linux-gnu/ppc/Makefile.in
+++ /dev/null
@@ -1,531 +0,0 @@
-# Makefile.in generated by automake 1.11.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# This file is part of ltrace.
-# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-# 02110-1301 USA
-
-
-VPATH = @srcdir@
-pkgdatadir = $(datadir)/@PACKAGE@
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-am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
-install_sh_DATA = $(install_sh) -c -m 644
-install_sh_PROGRAM = $(install_sh) -c
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-INSTALL_HEADER = $(INSTALL_DATA)
-transform = $(program_transform_name)
-NORMAL_INSTALL = :
-PRE_INSTALL = :
-POST_INSTALL = :
-NORMAL_UNINSTALL = :
-PRE_UNINSTALL = :
-POST_UNINSTALL = :
-build_triplet = @build@
-host_triplet = @host@
-subdir = sysdeps/linux-gnu/ppc
-DIST_COMMON = $(noinst_HEADERS) $(srcdir)/Makefile.am \
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-am__aclocal_m4_deps = $(top_srcdir)/config/m4/libtool.m4 \
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-___libcpu_la_OBJECTS = $(am____libcpu_la_OBJECTS)
-am__dirstamp = $(am__leading_dot)dirstamp
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diff --git a/sysdeps/linux-gnu/ppc/arch.h b/sysdeps/linux-gnu/ppc/arch.h
index fb8768a..2add3b8 100644
--- a/sysdeps/linux-gnu/ppc/arch.h
+++ b/sysdeps/linux-gnu/ppc/arch.h
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2012 Petr Machata
+ * Copyright (C) 2012,2013 Petr Machata
  * Copyright (C) 2006 Paul Gilliam
  * Copyright (C) 2002,2004 Juan Cespedes
  *
@@ -37,8 +37,9 @@
 #define ARCH_SUPPORTS_OPD
 #endif
 
-#define ARCH_HAVE_ATOMIC_SINGLESTEP
+#define ARCH_HAVE_SW_SINGLESTEP
 #define ARCH_HAVE_ADD_PLT_ENTRY
+#define ARCH_HAVE_ADD_FUNC_ENTRY
 #define ARCH_HAVE_TRANSLATE_ADDRESS
 #define ARCH_HAVE_DYNLINK_DONE
 #define ARCH_HAVE_FETCH_ARG
@@ -56,6 +57,9 @@ struct arch_ltelf_data {
 	GElf_Addr opd_base;
 	GElf_Xword opd_size;
 	int secure_plt;
+
+	Elf_Data *reladyn;
+	size_t reladyn_count;
 };
 
 #define ARCH_HAVE_LIBRARY_DATA
@@ -79,6 +83,10 @@ enum ppc64_plt_type {
 	 * corresponding PLT entry.  The original is now saved in
 	 * RESOLVED_VALUE.  */
 	PPC_PLT_RESOLVED,
+
+	/* Very similar to PPC_PLT_UNRESOLVED, but for JMP_IREL
+	 * slots.  */
+	PPC_PLT_IRELATIVE,
 };
 
 #define ARCH_HAVE_LIBRARY_SYMBOL_DATA
@@ -92,7 +100,10 @@ struct arch_library_symbol_data {
 
 #define ARCH_HAVE_BREAKPOINT_DATA
 struct arch_breakpoint_data {
-	/* We need this just for arch_breakpoint_init.  */
+	/* This is where we hide symbol for IRELATIVE breakpoint for
+	 * the first time that it hits.  This is NULL for normal
+	 * breakpoints.  */
+	struct library_symbol *irel_libsym;
 };
 
 #define ARCH_HAVE_PROCESS_DATA
diff --git a/sysdeps/linux-gnu/ppc/fetch.c b/sysdeps/linux-gnu/ppc/fetch.c
index 9963a1e..ed38336 100644
--- a/sysdeps/linux-gnu/ppc/fetch.c
+++ b/sysdeps/linux-gnu/ppc/fetch.c
@@ -31,7 +31,7 @@
 #include "proc.h"
 #include "value.h"
 
-static int allocate_gpr(struct fetch_context *ctx, struct Process *proc,
+static int allocate_gpr(struct fetch_context *ctx, struct process *proc,
 			struct arg_type_info *info, struct value *valuep);
 
 /* Floating point registers have the same width on 32-bit as well as
@@ -66,7 +66,7 @@ struct fetch_context {
 };
 
 static int
-fetch_context_init(struct Process *proc, struct fetch_context *context)
+fetch_context_init(struct process *proc, struct fetch_context *context)
 {
 	context->greg = 3;
 	context->freg = 1;
@@ -108,7 +108,7 @@ fetch_context_init(struct Process *proc, struct fetch_context *context)
 }
 
 struct fetch_context *
-arch_fetch_arg_init(enum tof type, struct Process *proc,
+arch_fetch_arg_init(enum tof type, struct process *proc,
 		    struct arg_type_info *ret_info)
 {
 	struct fetch_context *context = malloc(sizeof(*context));
@@ -132,7 +132,7 @@ arch_fetch_arg_init(enum tof type, struct Process *proc,
 }
 
 struct fetch_context *
-arch_fetch_arg_clone(struct Process *proc,
+arch_fetch_arg_clone(struct process *proc,
 		     struct fetch_context *context)
 {
 	struct fetch_context *clone = malloc(sizeof(*context));
@@ -143,7 +143,7 @@ arch_fetch_arg_clone(struct Process *proc,
 }
 
 static int
-allocate_stack_slot(struct fetch_context *ctx, struct Process *proc,
+allocate_stack_slot(struct fetch_context *ctx, struct process *proc,
 		    struct arg_type_info *info, struct value *valuep)
 {
 	size_t sz = type_sizeof(proc, info);
@@ -170,7 +170,7 @@ allocate_stack_slot(struct fetch_context *ctx, struct Process *proc,
 }
 
 static uint64_t
-read_gpr(struct fetch_context *ctx, struct Process *proc, int reg_num)
+read_gpr(struct fetch_context *ctx, struct process *proc, int reg_num)
 {
 	if (proc->e_machine == EM_PPC)
 		return ctx->regs.r32[reg_num];
@@ -215,7 +215,7 @@ align_small_int(unsigned char *buf, size_t w, size_t sz)
 }
 
 static int
-allocate_gpr(struct fetch_context *ctx, struct Process *proc,
+allocate_gpr(struct fetch_context *ctx, struct process *proc,
 	     struct arg_type_info *info, struct value *valuep)
 {
 	if (ctx->greg > 10)
@@ -245,7 +245,7 @@ allocate_gpr(struct fetch_context *ctx, struct Process *proc,
 }
 
 static int
-allocate_float(struct fetch_context *ctx, struct Process *proc,
+allocate_float(struct fetch_context *ctx, struct process *proc,
 	       struct arg_type_info *info, struct value *valuep)
 {
 	int pool = proc->e_machine == EM_PPC64 ? 13 : 8;
@@ -276,7 +276,7 @@ allocate_float(struct fetch_context *ctx, struct Process *proc,
 }
 
 static int
-allocate_argument(struct fetch_context *ctx, struct Process *proc,
+allocate_argument(struct fetch_context *ctx, struct process *proc,
 		  struct arg_type_info *info, struct value *valuep)
 {
 	/* Floating point types and void are handled specially.  */
@@ -400,7 +400,7 @@ allocate_argument(struct fetch_context *ctx, struct Process *proc,
 
 int
 arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
-		    struct Process *proc,
+		    struct process *proc,
 		    struct arg_type_info *info, struct value *valuep)
 {
 	return allocate_argument(ctx, proc, info, valuep);
@@ -408,7 +408,7 @@ arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
 
 int
 arch_fetch_retval(struct fetch_context *ctx, enum tof type,
-		  struct Process *proc, struct arg_type_info *info,
+		  struct process *proc, struct arg_type_info *info,
 		  struct value *valuep)
 {
 	if (ctx->ret_struct) {
diff --git a/sysdeps/linux-gnu/ppc/plt.c b/sysdeps/linux-gnu/ppc/plt.c
index f83f087..5e3ffe1 100644
--- a/sysdeps/linux-gnu/ppc/plt.c
+++ b/sysdeps/linux-gnu/ppc/plt.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2004,2008,2009 Juan Cespedes
  * Copyright (C) 2006 Paul Gilliam
  *
@@ -25,6 +25,7 @@
 #include <errno.h>
 #include <inttypes.h>
 #include <assert.h>
+#include <stdbool.h>
 #include <string.h>
 
 #include "proc.h"
@@ -104,6 +105,28 @@
  * through half the dynamic linker, we just let the thread run and hit
  * this breakpoint.  When it hits, we know the PLT entry was resolved.
  *
+ * Another twist comes from tracing slots corresponding to
+ * R_PPC64_JMP_IREL relocations.  These have no dedicated PLT entry.
+ * The calls are done directly from stubs, and the .plt entry
+ * (actually .iplt entry, these live in a special section) is resolved
+ * in advance before the binary starts.  Because there's no PLT entry,
+ * we put the PLT breakpoints directly to the IFUNC resolver code, and
+ * then would like them to behave like ordinary PLT slots, including
+ * catching the point where these get resolved to unresolve them.  So
+ * for the first call (which is the actual resolver call), we pretend
+ * that this breakpoint is artificial and has no associated symbol,
+ * and turn it on fully only after the first hit.  Ideally we would
+ * trace that first call as well, but then the stepper, which tries to
+ * catch the point where the slot is resolved, would hit the return
+ * breakpoint and that's not currently handled well.
+ *
+ * On PPC32 with secure PLT, the address of IFUNC symbols in main
+ * binary actually isn't of the resolver, but of a PLT slot.  We
+ * therefore have to locate the corresponding PLT relocation (which is
+ * of type R_PPC_IRELATIVE) and request that it be traced.  The addend
+ * of that relocation is an address of resolver, and we request
+ * tracing of the xyz.IFUNC symbol there.
+ *
  * XXX TODO If we have hardware watch point, we might put a read watch
  * on .plt slot, and discover the offenders this way.  I don't know
  * the details, but I assume at most a handful (like, one or two, if
@@ -125,51 +148,6 @@ host_powerpc64()
 #endif
 }
 
-int
-read_target_4(struct Process *proc, arch_addr_t addr, uint32_t *lp)
-{
-	unsigned long l = ptrace(PTRACE_PEEKTEXT, proc->pid, addr, 0);
-	if (l == -1UL && errno)
-		return -1;
-#ifdef __powerpc64__
-	l >>= 32;
-#endif
-	*lp = l;
-	return 0;
-}
-
-static int
-read_target_8(struct Process *proc, arch_addr_t addr, uint64_t *lp)
-{
-	unsigned long l = ptrace(PTRACE_PEEKTEXT, proc->pid, addr, 0);
-	if (l == -1UL && errno)
-		return -1;
-	if (host_powerpc64()) {
-		*lp = l;
-	} else {
-		unsigned long l2 = ptrace(PTRACE_PEEKTEXT, proc->pid,
-					  addr + 4, 0);
-		if (l2 == -1UL && errno)
-			return -1;
-		*lp = ((uint64_t)l << 32) | l2;
-	}
-	return 0;
-}
-
-int
-read_target_long(struct Process *proc, arch_addr_t addr, uint64_t *lp)
-{
-	if (proc->e_machine == EM_PPC) {
-		uint32_t w;
-		int ret = read_target_4(proc, addr, &w);
-		if (ret >= 0)
-			*lp = (uint64_t)w;
-		return ret;
-	} else {
-		return read_target_8(proc, addr, lp);
-	}
-}
-
 static void
 mark_as_resolved(struct library_symbol *libsym, GElf_Addr value)
 {
@@ -177,15 +155,53 @@ mark_as_resolved(struct library_symbol *libsym, GElf_Addr value)
 	libsym->arch.resolved_value = value;
 }
 
+static void
+ppc32_delayed_symbol(struct library_symbol *libsym)
+{
+	/* arch_dynlink_done is called on attach as well.  In that
+	 * case some slots will have been resolved already.
+	 * Unresolved PLT looks like this:
+	 *
+	 *    <sleep@plt>:	li      r11,0
+	 *    <sleep@plt+4>:	b       "resolve"
+	 *
+	 * "resolve" is another address in PLTGOT (the same block that
+	 * all the PLT slots are it).  When resolved, it looks either
+	 * this way:
+	 *
+	 *    <sleep@plt>:	b       0xfea88d0 <sleep>
+	 *
+	 * Which is easy to detect.  It can also look this way:
+	 *
+	 *    <sleep@plt>:	li      r11,0
+	 *    <sleep@plt+4>:	b       "dispatch"
+	 *
+	 * The "dispatch" address lies in PLTGOT as well.  In current
+	 * GNU toolchain, "dispatch" address is the same as PLTGOT
+	 * address.  We rely on this to figure out whether the address
+	 * is resolved or not.  */
+
+	uint32_t insn1 = libsym->arch.resolved_value >> 32;
+	uint32_t insn2 = (uint32_t) libsym->arch.resolved_value;
+	if ((insn1 & BRANCH_MASK) == B_INSN
+	    || ((insn2 & BRANCH_MASK) == B_INSN
+		/* XXX double cast  */
+		&& (ppc_branch_dest(libsym->enter_addr + 4, insn2)
+		    == (arch_addr_t) (long) libsym->lib->arch.pltgot_addr)))
+	{
+		mark_as_resolved(libsym, libsym->arch.resolved_value);
+	}
+}
+
 void
-arch_dynlink_done(struct Process *proc)
+arch_dynlink_done(struct process *proc)
 {
-	/* On PPC32 with BSS PLT, we need to enable delayed symbols.  */
+	/* We may need to activate delayed symbols.  */
 	struct library_symbol *libsym = NULL;
 	while ((libsym = proc_each_symbol(proc, libsym,
 					  library_symbol_delayed_cb, NULL))) {
-		if (read_target_8(proc, libsym->enter_addr,
-				  &libsym->arch.resolved_value) < 0) {
+		if (proc_read_64(proc, libsym->enter_addr,
+				 &libsym->arch.resolved_value) < 0) {
 			fprintf(stderr,
 				"couldn't read PLT value for %s(%p): %s\n",
 				libsym->name, libsym->enter_addr,
@@ -193,45 +209,34 @@ arch_dynlink_done(struct Process *proc)
 			return;
 		}
 
-		/* arch_dynlink_done is called on attach as well.  In
-		 * that case some slots will have been resolved
-		 * already.  Unresolved PLT looks like this:
-		 *
-		 *    <sleep@plt>:	li      r11,0
-		 *    <sleep@plt+4>:	b       "resolve"
-		 *
-		 * "resolve" is another address in PLTGOT (the same
-		 * block that all the PLT slots are it).  When
-		 * resolved, it looks either this way:
-		 *
-		 *    <sleep@plt>:	b       0xfea88d0 <sleep>
-		 *
-		 * Which is easy to detect.  It can also look this
-		 * way:
-		 *
-		 *    <sleep@plt>:	li      r11,0
-		 *    <sleep@plt+4>:	b       "dispatch"
-		 *
-		 * The "dispatch" address lies in PLTGOT as well.  In
-		 * current GNU toolchain, "dispatch" address is the
-		 * same as PLTGOT address.  We rely on this to figure
-		 * out whether the address is resolved or not.  */
-		uint32_t insn1 = libsym->arch.resolved_value >> 32;
-		uint32_t insn2 = (uint32_t)libsym->arch.resolved_value;
-		if ((insn1 & BRANCH_MASK) == B_INSN
-		    || ((insn2 & BRANCH_MASK) == B_INSN
-			/* XXX double cast  */
-			&& (ppc_branch_dest(libsym->enter_addr + 4, insn2)
-			    == (void*)(long)libsym->lib->arch.pltgot_addr)))
-			mark_as_resolved(libsym, libsym->arch.resolved_value);
+		if (proc->e_machine == EM_PPC)
+			ppc32_delayed_symbol(libsym);
 
 		if (proc_activate_delayed_symbol(proc, libsym) < 0)
 			return;
 
-		/* XXX double cast  */
-		libsym->arch.plt_slot_addr
-			= (GElf_Addr)(uintptr_t)libsym->enter_addr;
+		if (proc->e_machine == EM_PPC)
+			/* XXX double cast  */
+			libsym->arch.plt_slot_addr
+				= (GElf_Addr) (uintptr_t) libsym->enter_addr;
+	}
+}
+
+static bool
+reloc_is_irelative(int machine, GElf_Rela *rela)
+{
+	bool irelative = false;
+	if (machine == EM_PPC64) {
+#ifdef R_PPC64_JMP_IREL
+		irelative = GELF_R_TYPE(rela->r_info) == R_PPC64_JMP_IREL;
+#endif
+	} else {
+		assert(machine == EM_PPC);
+#ifdef R_PPC_IRELATIVE
+		irelative = GELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE;
+#endif
 	}
+	return irelative;
 }
 
 GElf_Addr
@@ -244,10 +249,28 @@ arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela *rela)
 	} else if (lte->ehdr.e_machine == EM_PPC) {
 		return rela->r_offset;
 
+	/* Beyond this point, we are on PPC64, but don't have stub
+	 * symbols.  */
+
+	} else if (reloc_is_irelative(lte->ehdr.e_machine, rela)) {
+
+		/* Put JMP_IREL breakpoint to resolver, since there's
+		 * no dedicated PLT entry.  */
+
+		assert(rela->r_addend != 0);
+		/* XXX double cast */
+		arch_addr_t res_addr = (arch_addr_t) (uintptr_t) rela->r_addend;
+		if (arch_translate_address(lte, res_addr, &res_addr) < 0) {
+			fprintf(stderr, "Couldn't OPD-translate IRELATIVE "
+				"resolver address.\n");
+			return 0;
+		}
+		/* XXX double cast */
+		return (GElf_Addr) (uintptr_t) res_addr;
+
 	} else {
-		/* If we get here, we don't have stub symbols.  In
-		 * that case we put brakpoints to PLT entries the same
-		 * as the PPC32 secure PLT case does.  */
+		/* We put brakpoints to PLT entries the same as the
+		 * PPC32 secure PLT case does. */
 		assert(lte->arch.plt_stub_vma != 0);
 		return lte->arch.plt_stub_vma + PPC64_PLT_STUB_SIZE * ndx;
 	}
@@ -258,12 +281,12 @@ arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela *rela)
  * ourselves with bias, as the values in OPD have been resolved
  * already.  */
 int
-arch_translate_address_dyn(struct Process *proc,
+arch_translate_address_dyn(struct process *proc,
 			   arch_addr_t addr, arch_addr_t *ret)
 {
 	if (proc->e_machine == EM_PPC64) {
 		uint64_t value;
-		if (read_target_8(proc, addr, &value) < 0) {
+		if (proc_read_64(proc, addr, &value) < 0) {
 			fprintf(stderr,
 				"dynamic .opd translation of %p: %s\n",
 				addr, strerror(errno));
@@ -307,7 +330,8 @@ load_opd_data(struct ltelf *lte, struct library *lib)
 {
 	Elf_Scn *sec;
 	GElf_Shdr shdr;
-	if (elf_get_section_named(lte, ".opd", &sec, &shdr) < 0) {
+	if (elf_get_section_named(lte, ".opd", &sec, &shdr) < 0
+	    || sec == NULL) {
 	fail:
 		fprintf(stderr, "couldn't find .opd data\n");
 		return -1;
@@ -324,7 +348,7 @@ load_opd_data(struct ltelf *lte, struct library *lib)
 }
 
 void *
-sym2addr(struct Process *proc, struct library_symbol *sym)
+sym2addr(struct process *proc, struct library_symbol *sym)
 {
 	return sym->enter_addr;
 }
@@ -335,8 +359,9 @@ get_glink_vma(struct ltelf *lte, GElf_Addr ppcgot, Elf_Data *plt_data)
 	Elf_Scn *ppcgot_sec = NULL;
 	GElf_Shdr ppcgot_shdr;
 	if (ppcgot != 0
-	    && elf_get_section_covering(lte, ppcgot,
-					&ppcgot_sec, &ppcgot_shdr) < 0)
+	    && (elf_get_section_covering(lte, ppcgot,
+					 &ppcgot_sec, &ppcgot_shdr) < 0
+		|| ppcgot_sec == NULL))
 		fprintf(stderr,
 			"DT_PPC_GOT=%#"PRIx64", but no such section found\n",
 			ppcgot);
@@ -425,6 +450,15 @@ nonzero_data(Elf_Data *data)
 	return 0;
 }
 
+static enum callback_status
+reloc_copy_if_irelative(GElf_Rela *rela, void *data)
+{
+	struct ltelf *lte = data;
+
+	return CBS_STOP_IF(reloc_is_irelative(lte->ehdr.e_machine, rela)
+			   && VECT_PUSHBACK(&lte->plt_relocs, rela) < 0);
+}
+
 int
 arch_elf_init(struct ltelf *lte, struct library *lib)
 {
@@ -445,6 +479,34 @@ arch_elf_init(struct ltelf *lte, struct library *lib)
 		 * value to something conspicuous.  */
 		lib->arch.bss_plt_prelinked = -1;
 
+	/* On PPC64 and PPC32 secure, IRELATIVE relocations actually
+	 * relocate .iplt section, and as such are stored in .rela.dyn
+	 * (where all non-PLT relocations are stored) instead of
+	 * .rela.plt.  Add these to lte->plt_relocs.  */
+
+	GElf_Addr rela, relasz;
+	Elf_Scn *rela_sec;
+	GElf_Shdr rela_shdr;
+	if ((lte->ehdr.e_machine == EM_PPC64 || lte->arch.secure_plt)
+	    && load_dynamic_entry(lte, DT_RELA, &rela) == 0
+	    && load_dynamic_entry(lte, DT_RELASZ, &relasz) == 0
+	    && elf_get_section_covering(lte, rela, &rela_sec, &rela_shdr) == 0
+	    && rela_sec != NULL) {
+
+		struct vect v;
+		VECT_INIT(&v, GElf_Rela);
+		int ret = elf_read_relocs(lte, rela_sec, &rela_shdr, &v);
+		if (ret >= 0
+		    && VECT_EACH(&v, GElf_Rela, NULL,
+				 reloc_copy_if_irelative, lte) != NULL)
+			ret = -1;
+
+		VECT_DESTROY(&v, GElf_Rela, NULL, NULL);
+
+		if (ret < 0)
+			return ret;
+	}
+
 	if (lte->ehdr.e_machine == EM_PPC && lte->arch.secure_plt) {
 		GElf_Addr ppcgot;
 		if (load_dynamic_entry(lte, DT_PPC_GOT, &ppcgot) < 0) {
@@ -453,10 +515,9 @@ arch_elf_init(struct ltelf *lte, struct library *lib)
 		}
 		GElf_Addr glink_vma = get_glink_vma(lte, ppcgot, lte->plt_data);
 
-		assert(lte->relplt_size % 12 == 0);
-		size_t count = lte->relplt_size / 12; // size of RELA entry
+		size_t count = vect_size(&lte->plt_relocs);
 		lte->arch.plt_stub_vma = glink_vma
-			- (GElf_Addr)count * PPC_PLT_STUB_SIZE;
+			- (GElf_Addr) count * PPC_PLT_STUB_SIZE;
 		debug(1, "stub_vma is %#" PRIx64, lte->arch.plt_stub_vma);
 
 	} else if (lte->ehdr.e_machine == EM_PPC64) {
@@ -560,7 +621,7 @@ arch_elf_init(struct ltelf *lte, struct library *lib)
 }
 
 static int
-read_plt_slot_value(struct Process *proc, GElf_Addr addr, GElf_Addr *valp)
+read_plt_slot_value(struct process *proc, GElf_Addr addr, GElf_Addr *valp)
 {
 	/* On PPC64, we read from .plt, which contains 8 byte
 	 * addresses.  On PPC32 we read from .plt, which contains 4
@@ -568,7 +629,7 @@ read_plt_slot_value(struct Process *proc, GElf_Addr addr, GElf_Addr *valp)
 	 * either can change.  */
 	uint64_t l;
 	/* XXX double cast.  */
-	if (read_target_8(proc, (arch_addr_t)(uintptr_t)addr, &l) < 0) {
+	if (proc_read_64(proc, (arch_addr_t)(uintptr_t)addr, &l) < 0) {
 		fprintf(stderr, "ptrace .plt slot value @%#" PRIx64": %s\n",
 			addr, strerror(errno));
 		return -1;
@@ -579,7 +640,7 @@ read_plt_slot_value(struct Process *proc, GElf_Addr addr, GElf_Addr *valp)
 }
 
 static int
-unresolve_plt_slot(struct Process *proc, GElf_Addr addr, GElf_Addr value)
+unresolve_plt_slot(struct process *proc, GElf_Addr addr, GElf_Addr value)
 {
 	/* We only modify plt_entry[0], which holds the resolved
 	 * address of the routine.  We keep the TOC and environment
@@ -594,36 +655,109 @@ unresolve_plt_slot(struct Process *proc, GElf_Addr addr, GElf_Addr value)
 }
 
 enum plt_status
-arch_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
+arch_elf_add_func_entry(struct process *proc, struct ltelf *lte,
+			const GElf_Sym *sym,
+			arch_addr_t addr, const char *name,
+			struct library_symbol **ret)
+{
+	if (lte->ehdr.e_machine != EM_PPC || lte->ehdr.e_type == ET_DYN)
+		return PLT_DEFAULT;
+
+	bool ifunc = false;
+#ifdef STT_GNU_IFUNC
+	ifunc = GELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC;
+#endif
+	if (! ifunc)
+		return PLT_DEFAULT;
+
+	size_t len = vect_size(&lte->plt_relocs);
+	size_t i;
+	for (i = 0; i < len; ++i) {
+		GElf_Rela *rela = VECT_ELEMENT(&lte->plt_relocs, GElf_Rela, i);
+		if (sym->st_value == arch_plt_sym_val(lte, i, rela)) {
+
+			char *tmp_name = linux_append_IFUNC_to_name(name);
+			struct library_symbol *libsym = malloc(sizeof *libsym);
+
+			/* XXX double cast.  */
+			arch_addr_t resolver_addr
+				= (arch_addr_t) (uintptr_t) rela->r_addend;
+
+			if (tmp_name == NULL || libsym == NULL
+			    || 	library_symbol_init(libsym, resolver_addr,
+						    tmp_name, 1,
+						    LS_TOPLT_EXEC) < 0) {
+			fail:
+				free(tmp_name);
+				free(libsym);
+				return PLT_FAIL;
+			}
+
+			if (elf_add_plt_entry(proc, lte, name, rela,
+					      i, ret) < 0) {
+				library_symbol_destroy(libsym);
+				goto fail;
+			}
+
+			libsym->proto = linux_IFUNC_prototype();
+			libsym->next = *ret;
+			*ret = libsym;
+			return PLT_OK;
+		}
+	}
+
+	*ret = NULL;
+	return PLT_OK;
+}
+
+enum plt_status
+arch_elf_add_plt_entry(struct process *proc, struct ltelf *lte,
 		       const char *a_name, GElf_Rela *rela, size_t ndx,
 		       struct library_symbol **ret)
 {
-	if (lte->ehdr.e_machine == EM_PPC) {
-		if (lte->arch.secure_plt)
-			return plt_default;
+	bool is_irelative = reloc_is_irelative(lte->ehdr.e_machine, rela);
+	char *name;
+	if (! is_irelative) {
+		name = strdup(a_name);
+	} else {
+		GElf_Addr addr = lte->ehdr.e_machine == EM_PPC64
+			? (GElf_Addr) rela->r_addend
+			: arch_plt_sym_val(lte, ndx, rela);
+		name = linux_elf_find_irelative_name(lte, addr);
+	}
 
-		struct library_symbol *libsym = NULL;
-		if (default_elf_add_plt_entry(proc, lte, a_name, rela, ndx,
-					      &libsym) < 0)
-			return plt_fail;
+	if (name == NULL) {
+	fail:
+		free(name);
+		return PLT_FAIL;
+	}
 
-		/* On PPC32 with BSS PLT, delay the symbol until
-		 * dynamic linker is done.  */
-		assert(!libsym->delayed);
-		libsym->delayed = 1;
+	struct library_symbol *chain = NULL;
+	if (lte->ehdr.e_machine == EM_PPC) {
+		if (default_elf_add_plt_entry(proc, lte, name, rela, ndx,
+					      &chain) < 0)
+			goto fail;
 
-		*ret = libsym;
-		return plt_ok;
+		if (! lte->arch.secure_plt) {
+			/* On PPC32 with BSS PLT, delay the symbol
+			 * until dynamic linker is done.  */
+			assert(!chain->delayed);
+			chain->delayed = 1;
+		}
+
+	ok:
+		*ret = chain;
+		free(name);
+		return PLT_OK;
 	}
 
 	/* PPC64.  If we have stubs, we return a chain of breakpoint
 	 * sites, one for each stub that corresponds to this PLT
 	 * entry.  */
-	struct library_symbol *chain = NULL;
 	struct library_symbol **symp;
 	for (symp = &lte->arch.stubs; *symp != NULL; ) {
 		struct library_symbol *sym = *symp;
-		if (strcmp(sym->name, a_name) != 0) {
+		if (strcmp(sym->name, name) != 0) {
 			symp = &(*symp)->next;
 			continue;
 		}
@@ -634,10 +768,8 @@ arch_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
 		chain = sym;
 	}
 
-	if (chain != NULL) {
-		*ret = chain;
-		return plt_ok;
-	}
+	if (chain != NULL)
+		goto ok;
 
 	/* We don't have stub symbols.  Find corresponding .plt slot,
 	 * and check whether it contains the corresponding PLT address
@@ -648,33 +780,33 @@ arch_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
 
 	GElf_Addr plt_entry_addr = arch_plt_sym_val(lte, ndx, rela);
 	GElf_Addr plt_slot_addr = rela->r_offset;
+
 	assert(plt_slot_addr >= lte->plt_addr
 	       || plt_slot_addr < lte->plt_addr + lte->plt_size);
 
 	GElf_Addr plt_slot_value;
 	if (read_plt_slot_value(proc, plt_slot_addr, &plt_slot_value) < 0)
-		return plt_fail;
+		goto fail;
 
-	char *name = strdup(a_name);
 	struct library_symbol *libsym = malloc(sizeof(*libsym));
-	if (name == NULL || libsym == NULL) {
+	if (libsym == NULL) {
 		fprintf(stderr, "allocation for .plt slot: %s\n",
 			strerror(errno));
-	fail:
-		free(name);
+	fail2:
 		free(libsym);
-		return plt_fail;
+		goto fail;
 	}
 
 	/* XXX The double cast should be removed when
 	 * arch_addr_t becomes integral type.  */
 	if (library_symbol_init(libsym,
-				(arch_addr_t)(uintptr_t)plt_entry_addr,
+				(arch_addr_t) (uintptr_t) plt_entry_addr,
 				name, 1, LS_TOPLT_EXEC) < 0)
-		goto fail;
+		goto fail2;
 	libsym->arch.plt_slot_addr = plt_slot_addr;
 
-	if (plt_slot_value == plt_entry_addr || plt_slot_value == 0) {
+	if (! is_irelative
+	    && (plt_slot_value == plt_entry_addr || plt_slot_value == 0)) {
 		libsym->arch.type = PPC_PLT_UNRESOLVED;
 		libsym->arch.resolved_value = plt_entry_addr;
 
@@ -690,13 +822,19 @@ arch_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
 
 		if (unresolve_plt_slot(proc, plt_slot_addr, plt_entry_addr) < 0) {
 			library_symbol_destroy(libsym);
-			goto fail;
+			goto fail2;
+		}
+
+		if (! is_irelative) {
+			mark_as_resolved(libsym, plt_slot_value);
+		} else {
+			libsym->arch.type = PPC_PLT_IRELATIVE;
+			libsym->arch.resolved_value = plt_entry_addr;
 		}
-		mark_as_resolved(libsym, plt_slot_value);
 	}
 
 	*ret = libsym;
-	return plt_ok;
+	return PLT_OK;
 }
 
 void
@@ -712,7 +850,7 @@ arch_elf_destroy(struct ltelf *lte)
 }
 
 static void
-dl_plt_update_bp_on_hit(struct breakpoint *bp, struct Process *proc)
+dl_plt_update_bp_on_hit(struct breakpoint *bp, struct process *proc)
 {
 	debug(DEBUG_PROCESS, "pid=%d dl_plt_update_bp_on_hit %s(%p)",
 	      proc->pid, breakpoint_name(bp), bp->addr);
@@ -752,7 +890,7 @@ cb_on_all_stopped(struct process_stopping_handler *self)
 static enum callback_status
 cb_keep_stepping_p(struct process_stopping_handler *self)
 {
-	struct Process *proc = self->task_enabling_breakpoint;
+	struct process *proc = self->task_enabling_breakpoint;
 	struct library_symbol *libsym = self->breakpoint_being_enabled->libsym;
 
 	GElf_Addr value;
@@ -799,7 +937,7 @@ cb_keep_stepping_p(struct process_stopping_handler *self)
 	/* Install breakpoint to the address where the change takes
 	 * place.  If we fail, then that just means that we'll have to
 	 * singlestep the next time around as well.  */
-	struct Process *leader = proc->leader;
+	struct process *leader = proc->leader;
 	if (leader == NULL || leader->arch.dl_plt_update_bp != NULL)
 		goto done;
 
@@ -807,7 +945,7 @@ cb_keep_stepping_p(struct process_stopping_handler *self)
 	 * a store instruction, so moving the breakpoint one
 	 * instruction forward is safe.  */
 	arch_addr_t addr = get_instruction_pointer(proc) + 4;
-	leader->arch.dl_plt_update_bp = insert_breakpoint(proc, addr, NULL);
+	leader->arch.dl_plt_update_bp = insert_breakpoint_at(proc, addr, NULL);
 	if (leader->arch.dl_plt_update_bp == NULL)
 		goto done;
 
@@ -827,7 +965,7 @@ done:
 }
 
 static void
-jump_to_entry_point(struct Process *proc, struct breakpoint *bp)
+jump_to_entry_point(struct process *proc, struct breakpoint *bp)
 {
 	/* XXX The double cast should be removed when
 	 * arch_addr_t becomes integral type.  */
@@ -837,10 +975,19 @@ jump_to_entry_point(struct Process *proc, struct breakpoint *bp)
 }
 
 static void
-ppc_plt_bp_continue(struct breakpoint *bp, struct Process *proc)
+ppc_plt_bp_continue(struct breakpoint *bp, struct process *proc)
 {
+	/* If this is a first call through IREL breakpoint, enable the
+	 * symbol so that it doesn't look like an artificial
+	 * breakpoint anymore.  */
+	if (bp->libsym == NULL) {
+		assert(bp->arch.irel_libsym != NULL);
+		bp->libsym = bp->arch.irel_libsym;
+		bp->arch.irel_libsym = NULL;
+	}
+
 	switch (bp->libsym->arch.type) {
-		struct Process *leader;
+		struct process *leader;
 		void (*on_all_stopped)(struct process_stopping_handler *);
 		enum callback_status (*keep_stepping_p)
 			(struct process_stopping_handler *);
@@ -851,6 +998,7 @@ ppc_plt_bp_continue(struct breakpoint *bp, struct Process *proc)
 		assert(bp->libsym->lib->arch.bss_plt_prelinked == 0);
 		/* Fall through.  */
 
+	case PPC_PLT_IRELATIVE:
 	case PPC_PLT_UNRESOLVED:
 		on_all_stopped = NULL;
 		keep_stepping_p = NULL;
@@ -899,7 +1047,7 @@ ppc_plt_bp_continue(struct breakpoint *bp, struct Process *proc)
  * detect both cases and do any fix-ups necessary to mend this
  * situation.  */
 static enum callback_status
-detach_task_cb(struct Process *task, void *data)
+detach_task_cb(struct process *task, void *data)
 {
 	struct breakpoint *bp = data;
 
@@ -919,7 +1067,7 @@ detach_task_cb(struct Process *task, void *data)
 }
 
 static void
-ppc_plt_bp_retract(struct breakpoint *bp, struct Process *proc)
+ppc_plt_bp_retract(struct breakpoint *bp, struct process *proc)
 {
 	/* On PPC64, we rewrite .plt with PLT entry addresses.  This
 	 * needs to be undone.  Unfortunately, the program may have
@@ -933,9 +1081,10 @@ ppc_plt_bp_retract(struct breakpoint *bp, struct Process *proc)
 	}
 }
 
-void
+int
 arch_library_init(struct library *lib)
 {
+	return 0;
 }
 
 void
@@ -943,9 +1092,10 @@ arch_library_destroy(struct library *lib)
 {
 }
 
-void
+int
 arch_library_clone(struct library *retp, struct library *lib)
 {
+	return 0;
 }
 
 int
@@ -975,8 +1125,10 @@ arch_library_symbol_clone(struct library_symbol *retp,
  * don't need PROC here, we can store the data in BP if it is of
  * interest to us.  */
 int
-arch_breakpoint_init(struct Process *proc, struct breakpoint *bp)
+arch_breakpoint_init(struct process *proc, struct breakpoint *bp)
 {
+	bp->arch.irel_libsym = NULL;
+
 	/* Artificial and entry-point breakpoints are plain.  */
 	if (bp->libsym == NULL || bp->libsym->plt_type != LS_TOPLT_EXEC)
 		return 0;
@@ -996,6 +1148,14 @@ arch_breakpoint_init(struct Process *proc, struct breakpoint *bp)
 		.on_retract = ppc_plt_bp_retract,
 	};
 	breakpoint_set_callbacks(bp, &cbs);
+
+	/* For JMP_IREL breakpoints, make the breakpoint look
+	 * artificial by hiding the symbol.  */
+	if (bp->libsym->arch.type == PPC_PLT_IRELATIVE) {
+		bp->arch.irel_libsym = bp->libsym;
+		bp->libsym = NULL;
+	}
+
 	return 0;
 }
 
@@ -1012,7 +1172,7 @@ arch_breakpoint_clone(struct breakpoint *retp, struct breakpoint *sbp)
 }
 
 int
-arch_process_init(struct Process *proc)
+arch_process_init(struct process *proc)
 {
 	proc->arch.dl_plt_update_bp = NULL;
 	proc->arch.handler = NULL;
@@ -1020,19 +1180,19 @@ arch_process_init(struct Process *proc)
 }
 
 void
-arch_process_destroy(struct Process *proc)
+arch_process_destroy(struct process *proc)
 {
 }
 
 int
-arch_process_clone(struct Process *retp, struct Process *proc)
+arch_process_clone(struct process *retp, struct process *proc)
 {
 	retp->arch = proc->arch;
 	return 0;
 }
 
 int
-arch_process_exec(struct Process *proc)
+arch_process_exec(struct process *proc)
 {
 	return arch_process_init(proc);
 }
diff --git a/sysdeps/linux-gnu/ppc/regs.c b/sysdeps/linux-gnu/ppc/regs.c
index 37f89a4..40d7e7a 100644
--- a/sysdeps/linux-gnu/ppc/regs.c
+++ b/sysdeps/linux-gnu/ppc/regs.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2002,2008,2009 Juan Cespedes
  * Copyright (C) 2009 Juan Cespedes
  * Copyright (C) 2008 Luis Machado, IBM Corporation
@@ -40,35 +41,26 @@
 #endif
 
 void *
-get_instruction_pointer(Process *proc) {
+get_instruction_pointer(struct process *proc)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_NIP, 0);
 }
 
 void
-set_instruction_pointer(Process *proc, void *addr)
+set_instruction_pointer(struct process *proc, void *addr)
 {
 	if (ptrace(PTRACE_POKEUSER, proc->pid, sizeof(long)*PT_NIP, addr) != 0)
 		error(0, errno, "set_instruction_pointer");
 }
 
 void *
-get_stack_pointer(Process *proc) {
+get_stack_pointer(struct process *proc)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_R1, 0);
 }
 
 void *
-get_return_addr(Process *proc, void *stack_pointer) {
+get_return_addr(struct process *proc, void *stack_pointer)
+{
 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_LNK, 0);
 }
-
-void
-set_return_addr(Process *proc, void *addr) {
-	ptrace(PTRACE_POKEUSER, proc->pid, sizeof(long)*PT_LNK, addr);
-}
-
-/* Grab the value of CTR registers.  */
-void *
-get_count_register (Process *proc) {
-	return (void *) ptrace (PTRACE_PEEKUSER, proc->pid,
-				sizeof (long) * PT_CTR, 0);
-}
diff --git a/sysdeps/linux-gnu/ppc/trace.c b/sysdeps/linux-gnu/ppc/trace.c
index 4357a1e..ee9a6b5 100644
--- a/sysdeps/linux-gnu/ppc/trace.c
+++ b/sysdeps/linux-gnu/ppc/trace.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2010,2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2010,2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2011 Andreas Schwab
  * Copyright (C) 2002,2004,2008,2009 Juan Cespedes
  * Copyright (C) 2008 Luis Machado, IBM Corporation
@@ -49,7 +49,8 @@
 #endif
 
 void
-get_arch_dep(Process *proc) {
+get_arch_dep(struct process *proc)
+{
 #ifdef __powerpc64__
 	proc->mask_32bit = (proc->e_machine == EM_PPC);
 #endif
@@ -59,7 +60,8 @@ get_arch_dep(Process *proc) {
 
 /* Returns 1 if syscall, 2 if sysret, 0 otherwise. */
 int
-syscall_p(Process *proc, int status, int *sysnum) {
+syscall_p(struct process *proc, int status, int *sysnum)
+{
 	if (WIFSTOPPED(status)
 	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
 		long pc = (long)get_instruction_pointer(proc);
@@ -84,18 +86,15 @@ syscall_p(Process *proc, int status, int *sysnum) {
 
 /* The atomic skip code is mostly taken from GDB.  */
 
-/* In plt.h.  XXX make this official interface.  */
-int read_target_4(struct Process *proc, arch_addr_t addr, uint32_t *lp);
-
-int
-arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
-		       int (*add_cb)(void *addr, void *data),
-		       void *add_cb_data)
+enum sw_singlestep_status
+arch_sw_singlestep(struct process *proc, struct breakpoint *sbp,
+		   int (*add_cb)(arch_addr_t, struct sw_singlestep_data *),
+		   struct sw_singlestep_data *add_cb_data)
 {
 	arch_addr_t ip = get_instruction_pointer(proc);
 	struct breakpoint *other = address2bpstruct(proc->leader, ip);
 
-	debug(1, "arch_atomic_singlestep pid=%d addr=%p %s(%p)",
+	debug(1, "arch_sw_singlestep pid=%d addr=%p %s(%p)",
 	      proc->pid, ip, breakpoint_name(sbp), sbp->addr);
 
 	/* If the original instruction was lwarx/ldarx, we can't
@@ -107,15 +106,15 @@ arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
 	} u;
 	if (other != NULL) {
 		memcpy(u.buf, sbp->orig_value, BREAKPOINT_LENGTH);
-	} else if (read_target_4(proc, ip, &u.insn) < 0) {
+	} else if (proc_read_32(proc, ip, &u.insn) < 0) {
 		fprintf(stderr, "couldn't read instruction at IP %p\n", ip);
 		/* Do the normal singlestep.  */
-		return 1;
+		return SWS_HW;
 	}
 
 	if ((u.insn & LWARX_MASK) != LWARX_INSTRUCTION
 	    && (u.insn & LWARX_MASK) != LDARX_INSTRUCTION)
-		return 1;
+		return SWS_HW;
 
 	debug(1, "singlestep over atomic block at %p", ip);
 
@@ -125,7 +124,7 @@ arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
 		addr += 4;
 		unsigned long l = ptrace(PTRACE_PEEKTEXT, proc->pid, addr, 0);
 		if (l == (unsigned long)-1 && errno)
-			return -1;
+			return SWS_FAIL;
 		uint32_t insn;
 #ifdef __powerpc64__
 		insn = l >> 32;
@@ -140,7 +139,7 @@ arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
 			debug(1, "pid=%d, branch in atomic block from %p to %p",
 			      proc->pid, addr, branch_addr);
 			if (add_cb(branch_addr, add_cb_data) < 0)
-				return -1;
+				return SWS_FAIL;
 		}
 
 		/* Assume that the atomic sequence ends with a
@@ -157,22 +156,22 @@ arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
 		if (insn_count > 16) {
 			fprintf(stderr, "[%d] couldn't find end of atomic block"
 				" at %p\n", proc->pid, ip);
-			return -1;
+			return SWS_FAIL;
 		}
 	}
 
 	/* Put the breakpoint to the next instruction.  */
 	addr += 4;
 	if (add_cb(addr, add_cb_data) < 0)
-		return -1;
+		return SWS_FAIL;
 
 	debug(1, "PTRACE_CONT");
 	ptrace(PTRACE_CONT, proc->pid, 0, 0);
-	return 0;
+	return SWS_OK;
 }
 
 size_t
-arch_type_sizeof(struct Process *proc, struct arg_type_info *info)
+arch_type_sizeof(struct process *proc, struct arg_type_info *info)
 {
 	if (proc == NULL)
 		return (size_t)-2;
@@ -215,7 +214,7 @@ arch_type_sizeof(struct Process *proc, struct arg_type_info *info)
 }
 
 size_t
-arch_type_alignof(struct Process *proc, struct arg_type_info *info)
+arch_type_alignof(struct process *proc, struct arg_type_info *info)
 {
 	if (proc == NULL)
 		return (size_t)-2;
diff --git a/sysdeps/linux-gnu/proc.c b/sysdeps/linux-gnu/proc.c
index 5adfb16..953fd86 100644
--- a/sysdeps/linux-gnu/proc.c
+++ b/sysdeps/linux-gnu/proc.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2011,2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2010 Zachary T Welch, CodeSourcery
  * Copyright (C) 2010 Joe Damato
  * Copyright (C) 1998,2008,2009 Juan Cespedes
@@ -177,44 +177,46 @@ process_status_cb(const char *line, const char *prefix, void *data)
 	} while (0)
 
 	switch (c) {
-	case 'Z': RETURN(ps_zombie);
-	case 't': RETURN(ps_tracing_stop);
+	case 'Z': RETURN(PS_ZOMBIE);
+	case 't': RETURN(PS_TRACING_STOP);
 	case 'T':
 		/* This can be either "T (stopped)" or, for older
 		 * kernels, "T (tracing stop)".  */
 		if (!strcmp(status, "T (stopped)\n"))
-			RETURN(ps_stop);
+			RETURN(PS_STOP);
 		else if (!strcmp(status, "T (tracing stop)\n"))
-			RETURN(ps_tracing_stop);
+			RETURN(PS_TRACING_STOP);
 		else {
 			fprintf(stderr, "Unknown process status: %s",
 				status);
-			RETURN(ps_stop); /* Some sort of stop
+			RETURN(PS_STOP); /* Some sort of stop
 					  * anyway.  */
 		}
 	case 'D':
-	case 'S': RETURN(ps_sleeping);
+	case 'S': RETURN(PS_SLEEPING);
 	}
 
-	RETURN(ps_other);
+	RETURN(PS_OTHER);
 #undef RETURN
 }
 
 enum process_status
 process_status(pid_t pid)
 {
-	enum process_status ret = ps_invalid;
+	enum process_status ret = PS_INVALID;
 	FILE * file = open_status_file(pid);
 	if (file != NULL) {
 		each_line_starting(file, "State:\t", &process_status_cb, &ret);
 		fclose(file);
-		if (ret == ps_invalid)
-			fprintf(stderr, "process_status %d: %s", pid,
-				strerror(errno));
-	} else
+		if (ret == PS_INVALID)
+			fprintf(stderr,
+				"Couldn't determine status of process %d: %s\n",
+				pid, strerror(errno));
+	} else {
 		/* If the file is not present, the process presumably
 		 * exited already.  */
-		ret = ps_zombie;
+		ret = PS_ZOMBIE;
+	}
 
 	return ret;
 }
@@ -231,7 +233,7 @@ int
 process_tasks(pid_t pid, pid_t **ret_tasks, size_t *ret_n)
 {
 	PROC_PID_FILE(fn, "/proc/%d/task", pid);
-	DIR * d = opendir(fn);
+	DIR *d = opendir(fn);
 	if (d == NULL)
 		return -1;
 
@@ -243,7 +245,9 @@ process_tasks(pid_t pid, pid_t **ret_tasks, size_t *ret_n)
 		struct dirent entry;
 		struct dirent *result;
 		if (readdir_r(d, &entry, &result) != 0) {
+		fail:
 			free(tasks);
+			closedir(d);
 			return -1;
 		}
 		if (result == NULL)
@@ -254,14 +258,11 @@ process_tasks(pid_t pid, pid_t **ret_tasks, size_t *ret_n)
 				alloc = alloc > 0 ? (2 * alloc) : 8;
 				pid_t *ntasks = realloc(tasks,
 							sizeof(*tasks) * alloc);
-				if (ntasks == NULL) {
-					free(tasks);
-					return -1;
-				}
+				if (ntasks == NULL)
+					goto fail;
 				tasks = ntasks;
 			}
-			if (n >= alloc)
-				abort();
+			assert(n < alloc);
 			tasks[n++] = npid;
 		}
 	}
@@ -279,7 +280,7 @@ process_tasks(pid_t pid, pid_t **ret_tasks, size_t *ret_n)
  * ABI object, as theorized about somewhere on pmachata/revamp
  * branch.  */
 static void *
-select_32_64(struct Process *proc, void *p32, void *p64)
+select_32_64(struct process *proc, void *p32, void *p64)
 {
 	if (sizeof(long) == 4 || proc->mask_32bit)
 		return p32;
@@ -288,7 +289,7 @@ select_32_64(struct Process *proc, void *p32, void *p64)
 }
 
 static int
-fetch_dyn64(struct Process *proc, arch_addr_t *addr, Elf64_Dyn *ret)
+fetch_dyn64(struct process *proc, arch_addr_t *addr, Elf64_Dyn *ret)
 {
 	if (umovebytes(proc, *addr, ret, sizeof(*ret)) != sizeof(*ret))
 		return -1;
@@ -297,7 +298,7 @@ fetch_dyn64(struct Process *proc, arch_addr_t *addr, Elf64_Dyn *ret)
 }
 
 static int
-fetch_dyn32(struct Process *proc, arch_addr_t *addr, Elf64_Dyn *ret)
+fetch_dyn32(struct process *proc, arch_addr_t *addr, Elf64_Dyn *ret)
 {
 	Elf32_Dyn dyn;
 	if (umovebytes(proc, *addr, &dyn, sizeof(dyn)) != sizeof(dyn))
@@ -311,14 +312,14 @@ fetch_dyn32(struct Process *proc, arch_addr_t *addr, Elf64_Dyn *ret)
 }
 
 static int (*
-dyn_fetcher(struct Process *proc))(struct Process *,
+dyn_fetcher(struct process *proc))(struct process *,
 				   arch_addr_t *, Elf64_Dyn *)
 {
 	return select_32_64(proc, fetch_dyn32, fetch_dyn64);
 }
 
 int
-proc_find_dynamic_entry_addr(struct Process *proc, arch_addr_t src_addr,
+proc_find_dynamic_entry_addr(struct process *proc, arch_addr_t src_addr,
 			     int d_tag, arch_addr_t *ret)
 {
 	debug(DEBUG_FUNCTION, "find_dynamic_entry()");
@@ -364,7 +365,7 @@ struct lt_link_map_32 LT_LINK_MAP(32);
 struct lt_link_map_64 LT_LINK_MAP(64);
 
 static int
-fetch_lm64(struct Process *proc, arch_addr_t addr,
+fetch_lm64(struct process *proc, arch_addr_t addr,
 	   struct lt_link_map_64 *ret)
 {
 	if (umovebytes(proc, addr, ret, sizeof(*ret)) != sizeof(*ret))
@@ -373,7 +374,7 @@ fetch_lm64(struct Process *proc, arch_addr_t addr,
 }
 
 static int
-fetch_lm32(struct Process *proc, arch_addr_t addr,
+fetch_lm32(struct process *proc, arch_addr_t addr,
 	   struct lt_link_map_64 *ret)
 {
 	struct lt_link_map_32 lm;
@@ -390,7 +391,7 @@ fetch_lm32(struct Process *proc, arch_addr_t addr,
 }
 
 static int (*
-lm_fetcher(struct Process *proc))(struct Process *,
+lm_fetcher(struct process *proc))(struct process *,
 				  arch_addr_t, struct lt_link_map_64 *)
 {
 	return select_32_64(proc, fetch_lm32, fetch_lm64);
@@ -410,7 +411,7 @@ struct lt_r_debug_32 LT_R_DEBUG(32);
 struct lt_r_debug_64 LT_R_DEBUG(64);
 
 static int
-fetch_rd64(struct Process *proc, arch_addr_t addr,
+fetch_rd64(struct process *proc, arch_addr_t addr,
 	   struct lt_r_debug_64 *ret)
 {
 	if (umovebytes(proc, addr, ret, sizeof(*ret)) != sizeof(*ret))
@@ -419,7 +420,7 @@ fetch_rd64(struct Process *proc, arch_addr_t addr,
 }
 
 static int
-fetch_rd32(struct Process *proc, arch_addr_t addr,
+fetch_rd32(struct process *proc, arch_addr_t addr,
 	   struct lt_r_debug_64 *ret)
 {
 	struct lt_r_debug_32 rd;
@@ -436,7 +437,7 @@ fetch_rd32(struct Process *proc, arch_addr_t addr,
 }
 
 static int (*
-rdebug_fetcher(struct Process *proc))(struct Process *,
+rdebug_fetcher(struct process *proc))(struct process *,
 				      arch_addr_t, struct lt_r_debug_64 *)
 {
 	return select_32_64(proc, fetch_rd32, fetch_rd64);
@@ -463,13 +464,13 @@ fetch_auxv32_entry(int fd, Elf64_auxv_t *ret)
 }
 
 static int (*
-auxv_fetcher(struct Process *proc))(int, Elf64_auxv_t *)
+auxv_fetcher(struct process *proc))(int, Elf64_auxv_t *)
 {
 	return select_32_64(proc, fetch_auxv32_entry, fetch_auxv64_entry);
 }
 
 static void
-crawl_linkmap(struct Process *proc, struct lt_r_debug_64 *dbg)
+crawl_linkmap(struct process *proc, struct lt_r_debug_64 *dbg)
 {
 	debug (DEBUG_FUNCTION, "crawl_linkmap()");
 
@@ -483,7 +484,7 @@ crawl_linkmap(struct Process *proc, struct lt_r_debug_64 *dbg)
 	arch_addr_t addr = (arch_addr_t)(uintptr_t)dbg->r_map;
 
 	while (addr != 0) {
-		struct lt_link_map_64 rlm;
+		struct lt_link_map_64 rlm = {};
 		if (lm_fetcher(proc)(proc, addr, &rlm) < 0) {
 			debug(2, "Unable to read link map");
 			return;
@@ -533,17 +534,20 @@ crawl_linkmap(struct Process *proc, struct lt_r_debug_64 *dbg)
 		struct library *lib = malloc(sizeof(*lib));
 		if (lib == NULL) {
 		fail:
-			if (lib != NULL)
-				library_destroy(lib);
+			free(lib);
 			fprintf(stderr, "Couldn't load ELF object %s: %s\n",
 				lib_name, strerror(errno));
 			continue;
 		}
-		library_init(lib, LT_LIBTYPE_DSO);
 
-		if (ltelf_read_library(lib, proc, lib_name, rlm.l_addr) < 0)
+		if (library_init(lib, LT_LIBTYPE_DSO) < 0)
 			goto fail;
 
+		if (ltelf_read_library(lib, proc, lib_name, rlm.l_addr) < 0) {
+			library_destroy(lib);
+			goto fail;
+		}
+
 		lib->key = key;
 		proc_add_library(proc, lib);
 	}
@@ -551,7 +555,7 @@ crawl_linkmap(struct Process *proc, struct lt_r_debug_64 *dbg)
 }
 
 static int
-load_debug_struct(struct Process *proc, struct lt_r_debug_64 *ret)
+load_debug_struct(struct process *proc, struct lt_r_debug_64 *ret)
 {
 	debug(DEBUG_FUNCTION, "load_debug_struct");
 
@@ -564,7 +568,7 @@ load_debug_struct(struct Process *proc, struct lt_r_debug_64 *ret)
 }
 
 static void
-rdebug_bp_on_hit(struct breakpoint *bp, struct Process *proc)
+rdebug_bp_on_hit(struct breakpoint *bp, struct process *proc)
 {
 	debug(DEBUG_FUNCTION, "arch_check_dbg");
 
@@ -595,7 +599,7 @@ rdebug_bp_on_hit(struct breakpoint *bp, struct Process *proc)
 
 #ifndef ARCH_HAVE_FIND_DL_DEBUG
 int
-arch_find_dl_debug(struct Process *proc, arch_addr_t dyn_addr,
+arch_find_dl_debug(struct process *proc, arch_addr_t dyn_addr,
 		   arch_addr_t *ret)
 {
 	return proc_find_dynamic_entry_addr(proc, dyn_addr, DT_DEBUG, ret);
@@ -603,7 +607,7 @@ arch_find_dl_debug(struct Process *proc, arch_addr_t dyn_addr,
 #endif
 
 int
-linkmap_init(struct Process *proc, arch_addr_t dyn_addr)
+linkmap_init(struct process *proc, arch_addr_t dyn_addr)
 {
 	debug(DEBUG_FUNCTION, "linkmap_init(%d, dyn_addr=%p)", proc->pid, dyn_addr);
 
@@ -619,19 +623,29 @@ linkmap_init(struct Process *proc, arch_addr_t dyn_addr)
 		return status;
 	}
 
+	crawl_linkmap(proc, &rdbg);
+
 	/* XXX The double cast should be removed when
 	 * arch_addr_t becomes integral type.  */
 	arch_addr_t addr = (arch_addr_t)(uintptr_t)rdbg.r_brk;
 	if (arch_translate_address_dyn(proc, addr, &addr) < 0)
 		return -1;
 
-	struct breakpoint *rdebug_bp = insert_breakpoint(proc, addr, NULL);
-	static struct bp_callbacks rdebug_callbacks = {
-		.on_hit = rdebug_bp_on_hit,
-	};
-	rdebug_bp->cbs = &rdebug_callbacks;
-
-	crawl_linkmap(proc, &rdbg);
+	struct breakpoint *rdebug_bp = insert_breakpoint_at(proc, addr, NULL);
+	if (rdebug_bp == NULL) {
+		/* This is not fatal, the tracing can continue with
+		 * reduced functionality.  */
+		fprintf(stderr,
+			"Couldn't insert _r_debug breakpoint to %d: %s.\n"
+			"As a result of that, ltrace will not be able to "
+			"detect and trace\nnewly-loaded libraries.\n",
+			proc->pid, strerror(errno));
+	} else {
+		static struct bp_callbacks rdebug_callbacks = {
+			.on_hit = rdebug_bp_on_hit,
+		};
+		rdebug_bp->cbs = &rdebug_callbacks;
+	}
 
 	return 0;
 }
@@ -648,13 +662,13 @@ task_kill (pid_t pid, int sig)
 }
 
 void
-process_removed(struct Process *proc)
+process_removed(struct process *proc)
 {
 	delete_events_for(proc);
 }
 
 int
-process_get_entry(struct Process *proc,
+process_get_entry(struct process *proc,
 		  arch_addr_t *entryp,
 		  arch_addr_t *interp_biasp)
 {
@@ -706,7 +720,7 @@ process_get_entry(struct Process *proc,
 }
 
 int
-os_process_init(struct Process *proc)
+os_process_init(struct process *proc)
 {
 	proc->os.debug_addr = 0;
 	proc->os.debug_state = 0;
@@ -714,19 +728,19 @@ os_process_init(struct Process *proc)
 }
 
 void
-os_process_destroy(struct Process *proc)
+os_process_destroy(struct process *proc)
 {
 }
 
 int
-os_process_clone(struct Process *retp, struct Process *proc)
+os_process_clone(struct process *retp, struct process *proc)
 {
 	retp->os = proc->os;
 	return 0;
 }
 
 int
-os_process_exec(struct Process *proc)
+os_process_exec(struct process *proc)
 {
 	return 0;
 }
diff --git a/sysdeps/linux-gnu/s390/Makefile.in b/sysdeps/linux-gnu/s390/Makefile.in
deleted file mode 100644
index 0f55ef5..0000000
--- a/sysdeps/linux-gnu/s390/Makefile.in
+++ /dev/null
@@ -1,534 +0,0 @@
-# Makefile.in generated by automake 1.11.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
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-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# This file is part of ltrace.
-# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
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-#
-# You should have received a copy of the GNU General Public License
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-transform = $(program_transform_name)
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-	syscalls64.h
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-			   sort -u` ;; \
-	esac; \
-	for file in $$dist_files; do \
-	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
-	  if test -d $$d/$$file; then \
-	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
-	    if test -d "$(distdir)/$$file"; then \
-	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
-	    fi; \
-	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
-	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
-	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
-	    fi; \
-	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
-	  else \
-	    test -f "$(distdir)/$$file" \
-	    || cp -p $$d/$$file "$(distdir)/$$file" \
-	    || exit 1; \
-	  fi; \
-	done
-check-am: all-am
-check: check-am
-all-am: Makefile $(LTLIBRARIES) $(HEADERS)
-installdirs:
-install: install-am
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-
-install-am: all-am
-	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
-
-installcheck: installcheck-am
-install-strip:
-	$(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
-	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
-	  `test -z '$(STRIP)' || \
-	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
-mostlyclean-generic:
-
-clean-generic:
-
-distclean-generic:
-	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
-	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
-	-rm -f ../$(am__dirstamp)
-
-maintainer-clean-generic:
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-	@echo "it deletes files that may require special tools to rebuild."
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-clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
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-	distclean-tags
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-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/sysdeps/linux-gnu/s390/fetch.c b/sysdeps/linux-gnu/s390/fetch.c
index fa8f42d..0b68dbc 100644
--- a/sysdeps/linux-gnu/s390/fetch.c
+++ b/sysdeps/linux-gnu/s390/fetch.c
@@ -61,7 +61,7 @@ s390x(struct fetch_context *ctx)
 }
 
 static int
-fetch_register_banks(struct Process *proc, struct fetch_context *ctx)
+fetch_register_banks(struct process *proc, struct fetch_context *ctx)
 {
 	ptrace_area parea;
 	parea.len = sizeof(ctx->regs);
@@ -76,7 +76,7 @@ fetch_register_banks(struct Process *proc, struct fetch_context *ctx)
 }
 
 static int
-fetch_context_init(struct Process *proc, struct fetch_context *context)
+fetch_context_init(struct process *proc, struct fetch_context *context)
 {
 	context->greg = 2;
 	context->freg = 0;
@@ -84,7 +84,7 @@ fetch_context_init(struct Process *proc, struct fetch_context *context)
 }
 
 struct fetch_context *
-arch_fetch_arg_init(enum tof type, struct Process *proc,
+arch_fetch_arg_init(enum tof type, struct process *proc,
 		    struct arg_type_info *ret_info)
 {
 	struct fetch_context *context = malloc(sizeof(*context));
@@ -105,7 +105,7 @@ arch_fetch_arg_init(enum tof type, struct Process *proc,
 }
 
 struct fetch_context *
-arch_fetch_arg_clone(struct Process *proc,
+arch_fetch_arg_clone(struct process *proc,
 		     struct fetch_context *context)
 {
 	struct fetch_context *clone = malloc(sizeof(*context));
@@ -116,7 +116,7 @@ arch_fetch_arg_clone(struct Process *proc,
 }
 
 static int
-allocate_stack_slot(struct fetch_context *ctx, struct Process *proc,
+allocate_stack_slot(struct fetch_context *ctx, struct process *proc,
 		    struct arg_type_info *info, struct value *valuep,
 		    size_t sz)
 {
@@ -148,7 +148,7 @@ copy_gpr(struct fetch_context *ctx, struct value *valuep, int regno)
 }
 
 static int
-allocate_gpr(struct fetch_context *ctx, struct Process *proc,
+allocate_gpr(struct fetch_context *ctx, struct process *proc,
 	     struct arg_type_info *info, struct value *valuep,
 	     size_t sz)
 {
@@ -160,7 +160,7 @@ allocate_gpr(struct fetch_context *ctx, struct Process *proc,
 }
 
 static int
-allocate_gpr_pair(struct fetch_context *ctx, struct Process *proc,
+allocate_gpr_pair(struct fetch_context *ctx, struct process *proc,
 		  struct arg_type_info *info, struct value *valuep,
 		  size_t sz)
 {
@@ -191,7 +191,7 @@ allocate_gpr_pair(struct fetch_context *ctx, struct Process *proc,
 }
 
 static int
-allocate_fpr(struct fetch_context *ctx, struct Process *proc,
+allocate_fpr(struct fetch_context *ctx, struct process *proc,
 	     struct arg_type_info *info, struct value *valuep,
 	     size_t sz)
 {
@@ -212,7 +212,7 @@ allocate_fpr(struct fetch_context *ctx, struct Process *proc,
 
 int
 arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
-		    struct Process *proc,
+		    struct process *proc,
 		    struct arg_type_info *info, struct value *valuep)
 {
 	size_t sz = type_sizeof(proc, info);
@@ -267,7 +267,7 @@ arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
 
 int
 arch_fetch_retval(struct fetch_context *ctx, enum tof type,
-		  struct Process *proc, struct arg_type_info *info,
+		  struct process *proc, struct arg_type_info *info,
 		  struct value *valuep)
 {
 	if (info->type == ARGTYPE_STRUCT) {
diff --git a/sysdeps/linux-gnu/s390/plt.c b/sysdeps/linux-gnu/s390/plt.c
index 5f612e5..8893d45 100644
--- a/sysdeps/linux-gnu/s390/plt.c
+++ b/sysdeps/linux-gnu/s390/plt.c
@@ -29,6 +29,7 @@ arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela) {
 }
 
 void *
-sym2addr(Process *proc, struct library_symbol *sym) {
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
 	return sym->enter_addr;
 }
diff --git a/sysdeps/linux-gnu/s390/regs.c b/sysdeps/linux-gnu/s390/regs.c
index 0592ccd..51410d7 100644
--- a/sysdeps/linux-gnu/s390/regs.c
+++ b/sysdeps/linux-gnu/s390/regs.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2002,2004,2008,2009 Juan Cespedes
  * Copyright (C) 2009 Juan Cespedes
  * Copyright (C) 2006 Ian Wienand
@@ -45,50 +46,52 @@
 #define PSW_MASK	0x7fffffff
 #endif
 
-void *
-get_instruction_pointer(Process *proc) {
+arch_addr_t
+get_instruction_pointer(struct process *proc)
+{
 	long ret = ptrace(PTRACE_PEEKUSER, proc->pid, PT_PSWADDR, 0) & PSW_MASK;
 #ifdef __s390x__
 	if (proc->mask_32bit)
 		ret &= PSW_MASK31;
 #endif
-	return (void *)ret;
+	/* XXX double cast.  */
+	return (arch_addr_t)ret;
 }
 
 void
-set_instruction_pointer(Process *proc, void *addr) {
+set_instruction_pointer(struct process *proc, arch_addr_t addr)
+{
 #ifdef __s390x__
 	if (proc->mask_32bit)
-		addr = (void *)((long)addr & PSW_MASK31);
+		/* XXX double cast.  */
+		addr = (arch_addr_t)((uintptr_t)addr & PSW_MASK31);
+#else
+	/* XXX double cast.  */
+	addr = (arch_addr_t)((uintptr_t)addr | ~PSW_MASK);
 #endif
 	ptrace(PTRACE_POKEUSER, proc->pid, PT_PSWADDR, addr);
 }
 
-void *
-get_stack_pointer(Process *proc) {
+arch_addr_t
+get_stack_pointer(struct process *proc)
+{
 	long ret = ptrace(PTRACE_PEEKUSER, proc->pid, PT_GPR15, 0) & PSW_MASK;
 #ifdef __s390x__
 	if (proc->mask_32bit)
 		ret &= PSW_MASK31;
 #endif
-	return (void *)ret;
+	/* XXX double cast.  */
+	return (arch_addr_t)ret;
 }
 
-void *
-get_return_addr(Process *proc, void *stack_pointer) {
+arch_addr_t
+get_return_addr(struct process *proc, arch_addr_t stack_pointer)
+{
 	long ret = ptrace(PTRACE_PEEKUSER, proc->pid, PT_GPR14, 0) & PSW_MASK;
 #ifdef __s390x__
 	if (proc->mask_32bit)
 		ret &= PSW_MASK31;
 #endif
-	return (void *)ret;
-}
-
-void
-set_return_addr(Process *proc, void *addr) {
-#ifdef __s390x__
-	if (proc->mask_32bit)
-		addr = (void *)((long)addr & PSW_MASK31);
-#endif
-	ptrace(PTRACE_POKEUSER, proc->pid, PT_GPR14, addr);
+	/* XXX double cast.  */
+	return (arch_addr_t)ret;
 }
diff --git a/sysdeps/linux-gnu/s390/trace.c b/sysdeps/linux-gnu/s390/trace.c
index b9e05ff..78b04c3 100644
--- a/sysdeps/linux-gnu/s390/trace.c
+++ b/sysdeps/linux-gnu/s390/trace.c
@@ -43,7 +43,8 @@
 #endif
 
 void
-get_arch_dep(Process *proc) {
+get_arch_dep(struct process *proc)
+{
 #ifdef __s390x__
 	unsigned long psw;
 
@@ -64,7 +65,8 @@ get_arch_dep(Process *proc) {
 /* Returns 1 if syscall, 2 if sysret, 0 otherwise.
  */
 int
-syscall_p(Process *proc, int status, int *sysnum) {
+syscall_p(struct process *proc, int status, int *sysnum)
+{
 	long pc, opcode, offset_reg, scno, tmp;
 	void *svc_addr;
 	int gpr_offset[16] = { PT_GPR0, PT_GPR1, PT_ORIGGPR2, PT_GPR3,
@@ -175,7 +177,7 @@ syscall_p(Process *proc, int status, int *sysnum) {
 }
 
 size_t
-arch_type_sizeof(struct Process *proc, struct arg_type_info *info)
+arch_type_sizeof(struct process *proc, struct arg_type_info *info)
 {
 	if (proc == NULL)
 		return (size_t)-2;
@@ -217,7 +219,7 @@ arch_type_sizeof(struct Process *proc, struct arg_type_info *info)
 }
 
 size_t
-arch_type_alignof(struct Process *proc, struct arg_type_info *info)
+arch_type_alignof(struct process *proc, struct arg_type_info *info)
 {
 	if (proc == NULL)
 		return (size_t)-2;
diff --git a/sysdeps/linux-gnu/sparc/Makefile.in b/sysdeps/linux-gnu/sparc/Makefile.in
deleted file mode 100644
index d94a1d8..0000000
--- a/sysdeps/linux-gnu/sparc/Makefile.in
+++ /dev/null
@@ -1,528 +0,0 @@
-# Makefile.in generated by automake 1.11.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# This file is part of ltrace.
-# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-# 02110-1301 USA
-
-
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-INSTALL_HEADER = $(INSTALL_DATA)
-transform = $(program_transform_name)
-NORMAL_INSTALL = :
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-DIST_COMMON = $(noinst_HEADERS) $(srcdir)/Makefile.am \
-	$(srcdir)/Makefile.in
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-	      exit 1;; \
-	  esac; \
-	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign sysdeps/linux-gnu/sparc/Makefile'; \
-	$(am__cd) $(top_srcdir) && \
-	  $(AUTOMAKE) --foreign sysdeps/linux-gnu/sparc/Makefile
-.PRECIOUS: Makefile
-Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
-	@case '$?' in \
-	  *config.status*) \
-	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
-	  *) \
-	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
-	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
-	esac;
-
-$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
-	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
-
-$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
-	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
-$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
-	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
-$(am__aclocal_m4_deps):
-
-clean-noinstLTLIBRARIES:
-	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
-	@list='$(noinst_LTLIBRARIES)'; for p in $$list; do \
-	  dir="`echo $$p | sed -e 's|/[^/]*$$||'`"; \
-	  test "$$dir" != "$$p" || dir=.; \
-	  echo "rm -f \"$${dir}/so_locations\""; \
-	  rm -f "$${dir}/so_locations"; \
-	done
-../$(am__dirstamp):
-	@$(MKDIR_P) ..
-	@: > ../$(am__dirstamp)
-../libcpu.la: $(___libcpu_la_OBJECTS) $(___libcpu_la_DEPENDENCIES) ../$(am__dirstamp)
-	$(LINK)  $(___libcpu_la_OBJECTS) $(___libcpu_la_LIBADD) $(LIBS)
-
-mostlyclean-compile:
-	-rm -f *.$(OBJEXT)
-
-distclean-compile:
-	-rm -f *.tab.c
-
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plt.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/regs.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/trace.Plo@am__quote@
-
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-@am__fastdepCC_TRUE@	$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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-@am__fastdepCC_FALSE@	$(COMPILE) -c $<
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-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
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-
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-@am__fastdepCC_TRUE@	$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
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-@am__fastdepCC_FALSE@	$(LTCOMPILE) -c -o $@ $<
-
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-	-rm -f *.lo
-
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-	-rm -rf ../.libs ../_libs
-
-ID: $(HEADERS) $(SOURCES) $(LISP) $(TAGS_FILES)
-	list='$(SOURCES) $(HEADERS) $(LISP) $(TAGS_FILES)'; \
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-	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
-	  done | \
-	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
-	      END { if (nonempty) { for (i in files) print i; }; }'`; \
-	mkid -fID $$unique
-tags: TAGS
-
-TAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
-		$(TAGS_FILES) $(LISP)
-	set x; \
-	here=`pwd`; \
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
-	unique=`for i in $$list; do \
-	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
-	  done | \
-	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
-	      END { if (nonempty) { for (i in files) print i; }; }'`; \
-	shift; \
-	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
-	  test -n "$$unique" || unique=$$empty_fix; \
-	  if test $$# -gt 0; then \
-	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
-	      "$$@" $$unique; \
-	  else \
-	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
-	      $$unique; \
-	  fi; \
-	fi
-ctags: CTAGS
-CTAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
-		$(TAGS_FILES) $(LISP)
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
-	unique=`for i in $$list; do \
-	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
-	  done | \
-	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
-	      END { if (nonempty) { for (i in files) print i; }; }'`; \
-	test -z "$(CTAGS_ARGS)$$unique" \
-	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
-	     $$unique
-
-GTAGS:
-	here=`$(am__cd) $(top_builddir) && pwd` \
-	  && $(am__cd) $(top_srcdir) \
-	  && gtags -i $(GTAGS_ARGS) "$$here"
-
-distclean-tags:
-	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
-
-distdir: $(DISTFILES)
-	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
-	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
-	list='$(DISTFILES)'; \
-	  dist_files=`for file in $$list; do echo $$file; done | \
-	  sed -e "s|^$$srcdirstrip/||;t" \
-	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
-	case $$dist_files in \
-	  */*) $(MKDIR_P) `echo "$$dist_files" | \
-			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
-			   sort -u` ;; \
-	esac; \
-	for file in $$dist_files; do \
-	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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-	    if test -d "$(distdir)/$$file"; then \
-	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
-	    fi; \
-	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
-	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
-	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
-	    fi; \
-	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
-	  else \
-	    test -f "$(distdir)/$$file" \
-	    || cp -p $$d/$$file "$(distdir)/$$file" \
-	    || exit 1; \
-	  fi; \
-	done
-check-am: all-am
-check: check-am
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-	  `test -z '$(STRIP)' || \
-	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
-mostlyclean-generic:
-
-clean-generic:
-
-distclean-generic:
-	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
-	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
-	-rm -f ../$(am__dirstamp)
-
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-	@echo "it deletes files that may require special tools to rebuild."
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-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/sysdeps/linux-gnu/sparc/plt.c b/sysdeps/linux-gnu/sparc/plt.c
index 40bbabc..3d2e589 100644
--- a/sysdeps/linux-gnu/sparc/plt.c
+++ b/sysdeps/linux-gnu/sparc/plt.c
@@ -28,6 +28,7 @@ arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela) {
 }
 
 void *
-sym2addr(Process *proc, struct library_symbol *sym) {
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
 	return sym->enter_addr;
 }
diff --git a/sysdeps/linux-gnu/sparc/regs.c b/sysdeps/linux-gnu/sparc/regs.c
index 5e5ad20..c474c83 100644
--- a/sysdeps/linux-gnu/sparc/regs.c
+++ b/sysdeps/linux-gnu/sparc/regs.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2004,2008,2009 Juan Cespedes
  * Copyright (C) 2006 Ian Wienand
  *
@@ -27,7 +28,8 @@
 #include "common.h"
 
 void *
-get_instruction_pointer(Process *proc) {
+get_instruction_pointer(struct process *proc)
+{
 	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
 	if (a->valid)
 		return (void *)a->regs.pc;
@@ -35,14 +37,16 @@ get_instruction_pointer(Process *proc) {
 }
 
 void
-set_instruction_pointer(Process *proc, void *addr) {
+set_instruction_pointer(struct process *proc, void *addr)
+{
 	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
 	if (a->valid)
 		a->regs.pc = (long)addr;
 }
 
 void *
-get_stack_pointer(Process *proc) {
+get_stack_pointer(struct process *proc)
+{
 	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
 	if (a->valid)
 		return (void *)a->regs.u_regs[UREG_I5];
@@ -50,7 +54,8 @@ get_stack_pointer(Process *proc) {
 }
 
 void *
-get_return_addr(Process *proc, void *stack_pointer) {
+get_return_addr(struct process *proc, void *stack_pointer)
+{
 	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
 	unsigned int t;
 	if (!a->valid)
@@ -61,11 +66,3 @@ get_return_addr(Process *proc, void *stack_pointer) {
 		return (void *)a->regs.u_regs[UREG_I6] + 12;
 	return (void *)a->regs.u_regs[UREG_I6] + 8;
 }
-
-void
-set_return_addr(Process *proc, void *addr) {
-	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
-	if (!a->valid)
-		return;
-	ptrace(PTRACE_POKETEXT, proc->pid, a->regs.u_regs[UREG_I6] + 8, addr);
-}
diff --git a/sysdeps/linux-gnu/sparc/trace.c b/sysdeps/linux-gnu/sparc/trace.c
index e1725ff..078d406 100644
--- a/sysdeps/linux-gnu/sparc/trace.c
+++ b/sysdeps/linux-gnu/sparc/trace.c
@@ -31,7 +31,8 @@
 #include "common.h"
 
 void
-get_arch_dep(Process *proc) {
+get_arch_dep(struct process *proc)
+{
 	proc_archdep *a;
 	if (!proc->arch_ptr)
 		proc->arch_ptr = (void *)malloc(sizeof(proc_archdep));
@@ -43,7 +44,8 @@ get_arch_dep(Process *proc) {
  * Returns -1 otherwise
  */
 int
-syscall_p(Process *proc, int status, int *sysnum) {
+syscall_p(struct process *proc, int status, int *sysnum)
+{
 	if (WIFSTOPPED(status)
 	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
 		void *ip = get_instruction_pointer(proc);
@@ -66,7 +68,8 @@ syscall_p(Process *proc, int status, int *sysnum) {
 }
 
 long
-gimme_arg(enum tof type, Process *proc, int arg_num, struct arg_type_info *info)
+gimme_arg(enum tof type, struct process *proc, int arg_num,
+	  struct arg_type_info *info)
 {
 	proc_archdep *a = (proc_archdep *) proc->arch_ptr;
 	if (!a->valid) {
diff --git a/sysdeps/linux-gnu/trace.c b/sysdeps/linux-gnu/trace.c
index e13b761..e648b8f 100644
--- a/sysdeps/linux-gnu/trace.c
+++ b/sysdeps/linux-gnu/trace.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2007,2011,2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2007,2011,2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2010 Joe Damato
  * Copyright (C) 1998,2002,2003,2004,2008,2009 Juan Cespedes
  * Copyright (C) 2006 Ian Wienand
@@ -24,29 +24,36 @@
 #include "config.h"
 
 #include <asm/unistd.h>
-#include <sys/types.h>
-#include <sys/wait.h>
 #include <assert.h>
 #include <errno.h>
+#include <gelf.h>
+#include <inttypes.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 #include <unistd.h>
 
 #ifdef HAVE_LIBSELINUX
 # include <selinux/selinux.h>
 #endif
 
-#include "linux-gnu/trace.h"
 #include "linux-gnu/trace-defs.h"
+#include "linux-gnu/trace.h"
 #include "backend.h"
 #include "breakpoint.h"
 #include "debug.h"
 #include "events.h"
+#include "fetch.h"
+#include "ltrace-elf.h"
 #include "options.h"
 #include "proc.h"
+#include "prototype.h"
 #include "ptrace.h"
 #include "type.h"
+#include "value.h"
 
 void
 trace_fail_warning(pid_t pid)
@@ -111,7 +118,7 @@ trace_pid(pid_t pid)
 }
 
 void
-trace_set_options(struct Process *proc)
+trace_set_options(struct process *proc)
 {
 	if (proc->tracesysgood & 0x80)
 		return;
@@ -148,8 +155,8 @@ static enum ecb_status
 event_for_pid(Event *event, void *data)
 {
 	if (event->proc != NULL && event->proc->pid == (pid_t)(uintptr_t)data)
-		return ecb_yield;
-	return ecb_cont;
+		return ECB_YIELD;
+	return ECB_CONT;
 }
 
 static int
@@ -206,7 +213,7 @@ add_task_info(struct pid_set *pids, pid_t pid)
 }
 
 static enum callback_status
-task_stopped(struct Process *task, void *data)
+task_stopped(struct process *task, void *data)
 {
 	enum process_status st = process_status(task->pid);
 	if (data != NULL)
@@ -217,13 +224,13 @@ task_stopped(struct Process *task, void *data)
 	 * the meantime.  This can happen when the whole thread group
 	 * is terminating.  */
 	switch (st) {
-	case ps_invalid:
-	case ps_tracing_stop:
-	case ps_zombie:
+	case PS_INVALID:
+	case PS_TRACING_STOP:
+	case PS_ZOMBIE:
 		return CBS_CONT;
-	case ps_sleeping:
-	case ps_stop:
-	case ps_other:
+	case PS_SLEEPING:
+	case PS_STOP:
+	case PS_OTHER:
 		return CBS_STOP;
 	}
 
@@ -232,7 +239,7 @@ task_stopped(struct Process *task, void *data)
 
 /* Task is blocked if it's stopped, or if it's a vfork parent.  */
 static enum callback_status
-task_blocked(struct Process *task, void *data)
+task_blocked(struct process *task, void *data)
 {
 	struct pid_set *pids = data;
 	struct pid_task *task_info = get_task_info(pids, task->pid);
@@ -246,7 +253,7 @@ task_blocked(struct Process *task, void *data)
 static Event *process_vfork_on_event(struct event_handler *super, Event *event);
 
 static enum callback_status
-task_vforked(struct Process *task, void *data)
+task_vforked(struct process *task, void *data)
 {
 	if (task->event_handler != NULL
 	    && task->event_handler->on_event == &process_vfork_on_event)
@@ -255,15 +262,15 @@ task_vforked(struct Process *task, void *data)
 }
 
 static int
-is_vfork_parent(struct Process *task)
+is_vfork_parent(struct process *task)
 {
 	return each_task(task->leader, NULL, &task_vforked, NULL) != NULL;
 }
 
 static enum callback_status
-send_sigstop(struct Process *task, void *data)
+send_sigstop(struct process *task, void *data)
 {
-	struct Process *leader = task->leader;
+	struct process *leader = task->leader;
 	struct pid_set *pids = data;
 
 	/* Look for pre-existing task record, or add new.  */
@@ -299,8 +306,8 @@ send_sigstop(struct Process *task, void *data)
 	 * vforked process.  We set up event handler specially to hint
 	 * us.  In that case parent is in D state, which we use to
 	 * weed out unnecessary looping.  */
-	if (st == ps_sleeping
-	    && is_vfork_parent (task)) {
+	if (st == PS_SLEEPING
+	    && is_vfork_parent(task)) {
 		task_info->vforked = 1;
 		return CBS_CONT;
 	}
@@ -321,20 +328,22 @@ send_sigstop(struct Process *task, void *data)
    breakpoint where IP points and let the process continue.  After
    this the breakpoint can be retracted and the process detached.  */
 static void
-ugly_workaround(struct Process *proc)
+ugly_workaround(struct process *proc)
 {
-	void *ip = get_instruction_pointer(proc);
-	struct breakpoint *sbp = dict_find_entry(proc->leader->breakpoints, ip);
-	if (sbp != NULL)
-		enable_breakpoint(proc, sbp);
-	else
-		insert_breakpoint(proc, ip, NULL);
+	arch_addr_t ip = get_instruction_pointer(proc);
+	struct breakpoint *found;
+	if (DICT_FIND_VAL(proc->leader->breakpoints, &ip, &found) < 0) {
+		insert_breakpoint_at(proc, ip, NULL);
+	} else {
+		assert(found != NULL);
+		enable_breakpoint(proc, found);
+	}
 	ptrace(PTRACE_CONT, proc->pid, 0, 0);
 }
 
 static void
 process_stopping_done(struct process_stopping_handler *self,
-		      struct Process *leader)
+		      struct process *leader)
 {
 	debug(DEBUG_PROCESS, "process stopping done %d",
 	      self->task_enabling_breakpoint->pid);
@@ -351,7 +360,7 @@ process_stopping_done(struct process_stopping_handler *self,
 
 	if (self->exiting) {
 	ugly_workaround:
-		self->state = psh_ugly_workaround;
+		self->state = PSH_UGLY_WORKAROUND;
 		ugly_workaround(self->task_enabling_breakpoint);
 	} else {
 		switch ((self->ugly_workaround_p)(self)) {
@@ -377,11 +386,11 @@ undo_breakpoint(Event *event, void *data)
 	    && event->proc->leader == data
 	    && event->type == EVENT_BREAKPOINT)
 		set_instruction_pointer(event->proc, event->e_un.brk_addr);
-	return ecb_cont;
+	return ECB_CONT;
 }
 
 static enum callback_status
-untrace_task(struct Process *task, void *data)
+untrace_task(struct process *task, void *data)
 {
 	if (task != data)
 		untrace_pid(task->pid);
@@ -389,7 +398,7 @@ untrace_task(struct Process *task, void *data)
 }
 
 static enum callback_status
-remove_task(struct Process *task, void *data)
+remove_task(struct process *task, void *data)
 {
 	/* Don't untrace leader just yet.  */
 	if (task != data)
@@ -398,14 +407,14 @@ remove_task(struct Process *task, void *data)
 }
 
 static enum callback_status
-retract_breakpoint_cb(struct Process *proc, struct breakpoint *bp, void *data)
+retract_breakpoint_cb(struct process *proc, struct breakpoint *bp, void *data)
 {
 	breakpoint_on_retract(bp, proc);
 	return CBS_CONT;
 }
 
 static void
-detach_process(struct Process *leader)
+detach_process(struct process *leader)
 {
 	each_qd_event(&undo_breakpoint, leader);
 	disable_all_breakpoints(leader);
@@ -414,7 +423,7 @@ detach_process(struct Process *leader)
 	/* Now untrace the process, if it was attached to by -p.  */
 	struct opt_p_t *it;
 	for (it = opt_p; it != NULL; it = it->next) {
-		struct Process *proc = pid2proc(it->pid);
+		struct process *proc = pid2proc(it->pid);
 		if (proc == NULL)
 			continue;
 		if (proc->leader == leader) {
@@ -540,19 +549,13 @@ all_stops_accountable(struct pid_set *pids)
 	return 1;
 }
 
-/* The protocol is: 0 for success, negative for failure, positive if
- * default singlestep is to be used.  */
-int arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
-			   int (*add_cb)(void *addr, void *data),
-			   void *add_cb_data);
-
-#ifndef ARCH_HAVE_ATOMIC_SINGLESTEP
-int
-arch_atomic_singlestep(struct Process *proc, struct breakpoint *sbp,
-		       int (*add_cb)(void *addr, void *data),
-		       void *add_cb_data)
+#ifndef ARCH_HAVE_SW_SINGLESTEP
+enum sw_singlestep_status
+arch_sw_singlestep(struct process *proc, struct breakpoint *bp,
+		   int (*add_cb)(arch_addr_t, struct sw_singlestep_data *),
+		   struct sw_singlestep_data *data)
 {
-	return 1;
+	return SWS_HW;
 }
 #endif
 
@@ -560,74 +563,84 @@ static Event *process_stopping_on_event(struct event_handler *super,
 					Event *event);
 
 static void
-remove_atomic_breakpoints(struct Process *proc)
+remove_sw_breakpoints(struct process *proc)
 {
 	struct process_stopping_handler *self
 		= (void *)proc->leader->event_handler;
 	assert(self != NULL);
 	assert(self->super.on_event == process_stopping_on_event);
 
-	int ct = sizeof(self->atomic_skip_bp_addrs)
-		/ sizeof(*self->atomic_skip_bp_addrs);
+	int ct = sizeof(self->sws_bps) / sizeof(*self->sws_bps);
 	int i;
 	for (i = 0; i < ct; ++i)
-		if (self->atomic_skip_bp_addrs[i] != 0) {
-			delete_breakpoint(proc, self->atomic_skip_bp_addrs[i]);
-			self->atomic_skip_bp_addrs[i] = 0;
+		if (self->sws_bps[i] != NULL) {
+			delete_breakpoint_at(proc, self->sws_bps[i]->addr);
+			self->sws_bps[i] = NULL;
 		}
 }
 
 static void
-atomic_singlestep_bp_on_hit(struct breakpoint *bp, struct Process *proc)
+sw_singlestep_bp_on_hit(struct breakpoint *bp, struct process *proc)
 {
-	remove_atomic_breakpoints(proc);
+	remove_sw_breakpoints(proc);
 }
 
+struct sw_singlestep_data {
+	struct process_stopping_handler *self;
+};
+
 static int
-atomic_singlestep_add_bp(void *addr, void *data)
+sw_singlestep_add_bp(arch_addr_t addr, struct sw_singlestep_data *data)
 {
-	struct process_stopping_handler *self = data;
-	struct Process *proc = self->task_enabling_breakpoint;
+	struct process_stopping_handler *self = data->self;
+	struct process *proc = self->task_enabling_breakpoint;
 
-	int ct = sizeof(self->atomic_skip_bp_addrs)
-		/ sizeof(*self->atomic_skip_bp_addrs);
+	int ct = sizeof(self->sws_bps) / sizeof(*self->sws_bps);
 	int i;
 	for (i = 0; i < ct; ++i)
-		if (self->atomic_skip_bp_addrs[i] == 0) {
-			self->atomic_skip_bp_addrs[i] = addr;
+		if (self->sws_bps[i] == NULL) {
 			static struct bp_callbacks cbs = {
-				.on_hit = atomic_singlestep_bp_on_hit,
+				.on_hit = sw_singlestep_bp_on_hit,
 			};
 			struct breakpoint *bp
-				= insert_breakpoint(proc, addr, NULL);
+				= insert_breakpoint_at(proc, addr, NULL);
 			breakpoint_set_callbacks(bp, &cbs);
+			self->sws_bps[i] = bp;
 			return 0;
 		}
 
-	assert(!"Too many atomic singlestep breakpoints!");
+	assert(!"Too many sw singlestep breakpoints!");
 	abort();
 }
 
 static int
 singlestep(struct process_stopping_handler *self)
 {
-	struct Process *proc = self->task_enabling_breakpoint;
-
-	int status = arch_atomic_singlestep(self->task_enabling_breakpoint,
-					    self->breakpoint_being_enabled,
-					    &atomic_singlestep_add_bp, self);
+	size_t i;
+	for (i = 0; i < sizeof(self->sws_bps) / sizeof(*self->sws_bps); ++i)
+		self->sws_bps[i] = NULL;
+
+	struct sw_singlestep_data data = { self };
+	switch (arch_sw_singlestep(self->task_enabling_breakpoint,
+				   self->breakpoint_being_enabled,
+				   &sw_singlestep_add_bp, &data)) {
+	case SWS_HW:
+		/* Otherwise do the default action: singlestep.  */
+		debug(1, "PTRACE_SINGLESTEP");
+		if (ptrace(PTRACE_SINGLESTEP,
+			   self->task_enabling_breakpoint->pid, 0, 0)) {
+			perror("PTRACE_SINGLESTEP");
+			return -1;
+		}
+		return 0;
 
-	/* Propagate failure and success.  */
-	if (status <= 0)
-		return status;
+	case SWS_OK:
+		return 0;
 
-	/* Otherwise do the default action: singlestep.  */
-	debug(1, "PTRACE_SINGLESTEP");
-	if (ptrace(PTRACE_SINGLESTEP, proc->pid, 0, 0)) {
-		perror("PTRACE_SINGLESTEP");
+	case SWS_FAIL:
 		return -1;
 	}
-	return 0;
+	abort();
 }
 
 static void
@@ -639,27 +652,27 @@ post_singlestep(struct process_stopping_handler *self,
 	if (*eventp != NULL && (*eventp)->type == EVENT_BREAKPOINT)
 		*eventp = NULL; // handled
 
-	struct Process *proc = self->task_enabling_breakpoint;
+	struct process *proc = self->task_enabling_breakpoint;
 
-	remove_atomic_breakpoints(proc);
+	remove_sw_breakpoints(proc);
 	self->breakpoint_being_enabled = NULL;
 }
 
 static void
 singlestep_error(struct process_stopping_handler *self)
 {
-	struct Process *teb = self->task_enabling_breakpoint;
+	struct process *teb = self->task_enabling_breakpoint;
 	struct breakpoint *sbp = self->breakpoint_being_enabled;
 	fprintf(stderr, "%d couldn't continue when handling %s (%p) at %p\n",
 		teb->pid, breakpoint_name(sbp),	sbp->addr,
 		get_instruction_pointer(teb));
-	delete_breakpoint(teb->leader, sbp->addr);
+	delete_breakpoint_at(teb->leader, sbp->addr);
 }
 
 static void
 pt_continue(struct process_stopping_handler *self)
 {
-	struct Process *teb = self->task_enabling_breakpoint;
+	struct process *teb = self->task_enabling_breakpoint;
 	debug(1, "PTRACE_CONT");
 	ptrace(PTRACE_CONT, teb->pid, 0, 0);
 }
@@ -675,12 +688,12 @@ static void
 disable_and(struct process_stopping_handler *self,
 	    void (*do_this)(struct process_stopping_handler *self))
 {
-	struct Process *teb = self->task_enabling_breakpoint;
+	struct process *teb = self->task_enabling_breakpoint;
 	debug(DEBUG_PROCESS, "all stopped, now singlestep/cont %d", teb->pid);
 	if (self->breakpoint_being_enabled->enabled)
 		disable_breakpoint(teb, self->breakpoint_being_enabled);
 	(do_this)(self);
-	self->state = psh_singlestep;
+	self->state = PSH_SINGLESTEP;
 }
 
 void
@@ -705,9 +718,9 @@ static Event *
 process_stopping_on_event(struct event_handler *super, Event *event)
 {
 	struct process_stopping_handler *self = (void *)super;
-	struct Process *task = event->proc;
-	struct Process *leader = task->leader;
-	struct Process *teb = self->task_enabling_breakpoint;
+	struct process *task = event->proc;
+	struct process *leader = task->leader;
+	struct process *teb = self->task_enabling_breakpoint;
 
 	debug(DEBUG_PROCESS,
 	      "process_stopping_on_event: pid %d; event type %d; state %d",
@@ -733,11 +746,12 @@ process_stopping_on_event(struct event_handler *super, Event *event)
 	if (event != NULL && event->type == EVENT_SYSRET) {
 		debug(1, "%d LT_EV_SYSRET", event->proc->pid);
 		event_to_queue = 0;
-		task_info->sysret = 1;
+		if (task_info != NULL)
+			task_info->sysret = 1;
 	}
 
 	switch (state) {
-	case psh_stopping:
+	case PSH_STOPPING:
 		/* If everyone is stopped, singlestep.  */
 		if (each_task(leader, NULL, &task_blocked,
 			      &self->pids) == NULL) {
@@ -746,7 +760,7 @@ process_stopping_on_event(struct event_handler *super, Event *event)
 		}
 		break;
 
-	case psh_singlestep:
+	case PSH_SINGLESTEP:
 		/* In singlestep state, breakpoint signifies that we
 		 * have now stepped, and can re-enable the breakpoint.  */
 		if (event != NULL && task == teb) {
@@ -801,13 +815,14 @@ process_stopping_on_event(struct event_handler *super, Event *event)
 		break;
 
 	psh_sinking:
-		state = self->state = psh_sinking;
-	case psh_sinking:
+		state = self->state = PSH_SINKING;
+		/* Fall through.  */
+	case PSH_SINKING:
 		if (await_sigstop_delivery(&self->pids, task_info, event))
 			process_stopping_done(self, leader);
 		break;
 
-	case psh_ugly_workaround:
+	case PSH_UGLY_WORKAROUND:
 		if (event == NULL)
 			break;
 		if (event->type == EVENT_BREAKPOINT) {
@@ -845,7 +860,7 @@ no(struct process_stopping_handler *self)
 }
 
 int
-process_install_stopping_handler(struct Process *proc, struct breakpoint *sbp,
+process_install_stopping_handler(struct process *proc, struct breakpoint *sbp,
 				 void (*as)(struct process_stopping_handler *),
 				 enum callback_status (*ks)
 					 (struct process_stopping_handler *),
@@ -894,7 +909,7 @@ process_install_stopping_handler(struct Process *proc, struct breakpoint *sbp,
 }
 
 void
-continue_after_breakpoint(Process *proc, struct breakpoint *sbp)
+continue_after_breakpoint(struct process *proc, struct breakpoint *sbp)
 {
 	debug(DEBUG_PROCESS,
 	      "continue_after_breakpoint: pid=%d, addr=%p",
@@ -904,18 +919,11 @@ continue_after_breakpoint(Process *proc, struct breakpoint *sbp)
 
 	if (sbp->enabled == 0) {
 		continue_process(proc->pid);
-	} else {
-#if defined __sparc__  || defined __ia64___
-		/* we don't want to singlestep here */
+	} else if (process_install_stopping_handler
+			(proc, sbp, NULL, NULL, NULL) < 0) {
+		perror("process_stopping_handler_create");
+		/* Carry on not bothering to re-enable.  */
 		continue_process(proc->pid);
-#else
-		if (process_install_stopping_handler
-		    (proc, sbp, NULL, NULL, NULL) < 0) {
-			perror("process_stopping_handler_create");
-			/* Carry on not bothering to re-enable.  */
-			continue_process(proc->pid);
-		}
-#endif
 	}
 }
 
@@ -937,8 +945,8 @@ static Event *
 ltrace_exiting_on_event(struct event_handler *super, Event *event)
 {
 	struct ltrace_exiting_handler *self = (void *)super;
-	struct Process *task = event->proc;
-	struct Process *leader = task->leader;
+	struct process *task = event->proc;
+	struct process *leader = task->leader;
 
 	debug(DEBUG_PROCESS,
 	      "ltrace_exiting_on_event: pid %d; event type %d",
@@ -970,7 +978,7 @@ ltrace_exiting_destroy(struct event_handler *super)
 }
 
 static int
-ltrace_exiting_install_handler(struct Process *proc)
+ltrace_exiting_install_handler(struct process *proc)
 {
 	/* Only install to leader.  */
 	if (proc->leader != proc)
@@ -1035,7 +1043,7 @@ ltrace_exiting_install_handler(struct Process *proc)
 struct process_vfork_handler
 {
 	struct event_handler super;
-	void *bp_addr;
+	int vfork_bp_refd:1;
 };
 
 static Event *
@@ -1046,38 +1054,33 @@ process_vfork_on_event(struct event_handler *super, Event *event)
 	      event->proc->pid, event->type);
 
 	struct process_vfork_handler *self = (void *)super;
-	struct breakpoint *sbp;
+	struct process *proc = event->proc;
 	assert(self != NULL);
 
 	switch (event->type) {
 	case EVENT_BREAKPOINT:
-		/* Remember the vfork return breakpoint.  */
-		if (self->bp_addr == 0)
-			self->bp_addr = event->e_un.brk_addr;
+		/* We turn on the vfork return breakpoint (which
+		 * should be the one that we have tripped over just
+		 * now) one extra time, so that the vfork parent hits
+		 * it as well.  */
+		if (!self->vfork_bp_refd) {
+			struct breakpoint *sbp = NULL;
+			DICT_FIND_VAL(proc->leader->breakpoints,
+				      &event->e_un.brk_addr, &sbp);
+			assert(sbp != NULL);
+			breakpoint_turn_on(sbp, proc->leader);
+			self->vfork_bp_refd = 1;
+		}
 		break;
 
 	case EVENT_EXIT:
 	case EVENT_EXIT_SIGNAL:
 	case EVENT_EXEC:
-		/* Smuggle back in the vfork return breakpoint, so
-		 * that our parent can trip over it once again.  */
-		if (self->bp_addr != 0) {
-			sbp = dict_find_entry(event->proc->leader->breakpoints,
-					      self->bp_addr);
-			if (sbp != NULL)
-				assert(sbp->libsym == NULL);
-			/* We don't mind failing that, it's not a big
-			 * deal to not display one extra vfork return.  */
-			insert_breakpoint(event->proc->parent,
-					  self->bp_addr, NULL);
-		}
-
-		continue_process(event->proc->parent->pid);
-
 		/* Remove the leader that we artificially set up
 		 * earlier.  */
-		change_process_leader(event->proc, event->proc);
-		destroy_event_handler(event->proc);
+		change_process_leader(proc, proc);
+		destroy_event_handler(proc);
+		continue_process(proc->parent->pid);
 
 	default:
 		;
@@ -1087,7 +1090,7 @@ process_vfork_on_event(struct event_handler *super, Event *event)
 }
 
 void
-continue_after_vfork(struct Process *proc)
+continue_after_vfork(struct process *proc)
 {
 	debug(DEBUG_PROCESS, "continue_after_vfork: pid=%d", proc->pid);
 	struct process_vfork_handler *handler = calloc(sizeof(*handler), 1);
@@ -1116,7 +1119,7 @@ continue_after_vfork(struct Process *proc)
 }
 
 static int
-is_mid_stopping(Process *proc)
+is_mid_stopping(struct process *proc)
 {
 	return proc != NULL
 		&& proc->event_handler != NULL
@@ -1124,7 +1127,7 @@ is_mid_stopping(Process *proc)
 }
 
 void
-continue_after_syscall(struct Process *proc, int sysnum, int ret_p)
+continue_after_syscall(struct process *proc, int sysnum, int ret_p)
 {
 	/* Don't continue if we are mid-stopping.  */
 	if (ret_p && (is_mid_stopping(proc) || is_mid_stopping(proc->leader))) {
@@ -1136,6 +1139,23 @@ continue_after_syscall(struct Process *proc, int sysnum, int ret_p)
 	continue_process(proc->pid);
 }
 
+void
+continue_after_exec(struct process *proc)
+{
+	continue_process(proc->pid);
+
+	/* After the exec, we expect to hit the first executable
+	 * instruction.
+	 *
+	 * XXX TODO It would be nice to have this removed, but then we
+	 * need to do that also for initial call to wait_for_proc in
+	 * execute_program.  In that case we could generate a
+	 * EVENT_FIRST event or something, or maybe this could somehow
+	 * be rolled into EVENT_NEW.  */
+	wait_for_proc(proc->pid);
+	continue_process(proc->pid);
+}
+
 /* If ltrace gets SIGINT, the processes directly or indirectly run by
  * ltrace get it too.  We just have to wait long enough for the signal
  * to be delivered and the process terminated, which we notice and
@@ -1152,7 +1172,7 @@ os_ltrace_exiting(void)
 {
 	struct opt_p_t *it;
 	for (it = opt_p; it != NULL; it = it->next) {
-		struct Process *proc = pid2proc(it->pid);
+		struct process *proc = pid2proc(it->pid);
 		if (proc == NULL || proc->leader == NULL)
 			continue;
 		if (ltrace_exiting_install_handler(proc->leader) < 0)
@@ -1174,7 +1194,8 @@ os_ltrace_exiting_sighandler(void)
 }
 
 size_t
-umovebytes(Process *proc, void *addr, void *laddr, size_t len) {
+umovebytes(struct process *proc, void *addr, void *laddr, size_t len)
+{
 
 	union {
 		long a;
@@ -1206,3 +1227,292 @@ umovebytes(Process *proc, void *addr, void *laddr, size_t len) {
 
 	return bytes_read;
 }
+
+struct irelative_name_data_t {
+	GElf_Addr addr;
+	const char *found_name;
+};
+
+static enum callback_status
+irelative_name_cb(GElf_Sym *symbol, const char *name, void *d)
+{
+	struct irelative_name_data_t *data = d;
+
+	if (symbol->st_value == data->addr) {
+		bool is_ifunc = false;
+#ifdef STT_GNU_IFUNC
+		is_ifunc = GELF_ST_TYPE(symbol->st_info) == STT_GNU_IFUNC;
+#endif
+		data->found_name = name;
+
+		/* Keep looking, unless we found the actual IFUNC
+		 * symbol.  What we matched may have been a symbol
+		 * denoting the resolver function, which would have
+		 * the same address.  */
+		return CBS_STOP_IF(is_ifunc);
+	}
+
+	return CBS_CONT;
+}
+
+char *
+linux_elf_find_irelative_name(struct ltelf *lte, GElf_Addr addr)
+{
+	struct irelative_name_data_t data = { addr, NULL };
+	if (addr != 0
+	    && elf_each_symbol(lte, 0,
+			       irelative_name_cb, &data).status < 0)
+		return NULL;
+
+	const char *name;
+	if (data.found_name != NULL) {
+		name = data.found_name;
+	} else {
+#define NAME "IREL."
+		/* NAME\0 + 0x + digits.  */
+		char *tmp_name = alloca(sizeof NAME + 2 + 16);
+		sprintf(tmp_name, NAME "%#" PRIx64, (uint64_t) addr);
+		name = tmp_name;
+#undef NAME
+	}
+
+	return strdup(name);
+}
+
+enum plt_status
+linux_elf_add_plt_entry_irelative(struct process *proc, struct ltelf *lte,
+				  GElf_Rela *rela, size_t ndx,
+				  struct library_symbol **ret)
+
+{
+	char *name = linux_elf_find_irelative_name(lte, rela->r_addend);
+	int i = default_elf_add_plt_entry(proc, lte, name, rela, ndx, ret);
+	free(name);
+	return i < 0 ? PLT_FAIL : PLT_OK;
+}
+
+struct prototype *
+linux_IFUNC_prototype(void)
+{
+	static struct prototype ret;
+	if (ret.return_info == NULL) {
+		prototype_init(&ret);
+		ret.return_info = type_get_voidptr();
+		ret.own_return_info = 0;
+	}
+	return &ret;
+}
+
+int
+os_library_symbol_init(struct library_symbol *libsym)
+{
+	libsym->os = (struct os_library_symbol_data){};
+	return 0;
+}
+
+void
+os_library_symbol_destroy(struct library_symbol *libsym)
+{
+}
+
+int
+os_library_symbol_clone(struct library_symbol *retp,
+			struct library_symbol *libsym)
+{
+	retp->os = libsym->os;
+	return 0;
+}
+
+char *
+linux_append_IFUNC_to_name(const char *name)
+{
+#define S ".IFUNC"
+	char *tmp_name = malloc(strlen(name) + sizeof S);
+	if (tmp_name == NULL)
+		return NULL;
+	sprintf(tmp_name, "%s%s", name, S);
+#undef S
+	return tmp_name;
+}
+
+enum plt_status
+os_elf_add_func_entry(struct process *proc, struct ltelf *lte,
+		      const GElf_Sym *sym,
+		      arch_addr_t addr, const char *name,
+		      struct library_symbol **ret)
+{
+	if (GELF_ST_TYPE(sym->st_info) == STT_FUNC)
+		return PLT_DEFAULT;
+
+	bool ifunc = false;
+#ifdef STT_GNU_IFUNC
+	ifunc = GELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC;
+#endif
+
+	if (ifunc) {
+		char *tmp_name = linux_append_IFUNC_to_name(name);
+		struct library_symbol *tmp = malloc(sizeof *tmp);
+		if (tmp_name == NULL || tmp == NULL) {
+		fail:
+			free(tmp_name);
+			free(tmp);
+			return PLT_FAIL;
+		}
+
+		if (library_symbol_init(tmp, addr, tmp_name, 1,
+					LS_TOPLT_NONE) < 0)
+			goto fail;
+		tmp->proto = linux_IFUNC_prototype();
+		tmp->os.is_ifunc = 1;
+
+		*ret = tmp;
+		return PLT_OK;
+	}
+
+	*ret = NULL;
+	return PLT_OK;
+}
+
+static enum callback_status
+libsym_at_address(struct library_symbol *libsym, void *addrp)
+{
+	arch_addr_t addr = *(arch_addr_t *)addrp;
+	return CBS_STOP_IF(addr == libsym->enter_addr);
+}
+
+static void
+ifunc_ret_hit(struct breakpoint *bp, struct process *proc)
+{
+	struct fetch_context *fetch = fetch_arg_init(LT_TOF_FUNCTION, proc,
+						     type_get_voidptr());
+	if (fetch == NULL)
+		return;
+
+	struct breakpoint *nbp = NULL;
+	int own_libsym = 0;
+
+	struct value value;
+	value_init(&value, proc, NULL, type_get_voidptr(), 0);
+	size_t sz = value_size(&value, NULL);
+	union {
+		uint64_t u64;
+		uint32_t u32;
+		arch_addr_t a;
+	} u;
+
+	if (fetch_retval(fetch, LT_TOF_FUNCTIONR, proc,
+			 value.type, &value) < 0
+	    || sz > 8 /* Captures failure as well.  */
+	    || value_extract_buf(&value, (void *) &u, NULL) < 0) {
+	fail:
+		fprintf(stderr,
+			"Couldn't trace the function "
+			"indicated by IFUNC resolver.\n");
+		goto done;
+	}
+
+	assert(sz == 4 || sz == 8);
+	/* XXX double casts below:  */
+	if (sz == 4)
+		u.a = (arch_addr_t)(uintptr_t)u.u32;
+	else
+		u.a = (arch_addr_t)(uintptr_t)u.u64;
+	if (arch_translate_address_dyn(proc, u.a, &u.a) < 0) {
+		fprintf(stderr, "Couldn't OPD-translate the address returned"
+			" by the IFUNC resolver.\n");
+		goto done;
+	}
+
+	assert(bp->os.ret_libsym != NULL);
+
+	struct library *lib = bp->os.ret_libsym->lib;
+	assert(lib != NULL);
+
+	/* Look if we already have a symbol with this address.
+	 * Otherwise create a new one.  */
+	struct library_symbol *libsym
+		= library_each_symbol(lib, NULL, libsym_at_address, &u.a);
+	if (libsym == NULL) {
+		libsym = malloc(sizeof *libsym);
+		char *name = strdup(bp->os.ret_libsym->name);
+
+		if (libsym == NULL
+		    || name == NULL
+		    || library_symbol_init(libsym, u.a, name, 1,
+					   LS_TOPLT_NONE) < 0) {
+			free(libsym);
+			free(name);
+			goto fail;
+		}
+
+		/* Snip the .IFUNC token.  */
+		*strrchr(name, '.') = 0;
+
+		own_libsym = 1;
+		library_add_symbol(lib, libsym);
+	}
+
+	nbp = malloc(sizeof *bp);
+	if (nbp == NULL || breakpoint_init(nbp, proc, u.a, libsym) < 0)
+		goto fail;
+
+	/* If there already is a breakpoint at that address, that is
+	 * suspicious, but whatever.  */
+	struct breakpoint *pre_bp = insert_breakpoint(proc, nbp);
+	if (pre_bp == NULL)
+		goto fail;
+	if (pre_bp == nbp) {
+		/* PROC took our breakpoint, so these resources are
+		 * not ours anymore.  */
+		nbp = NULL;
+		own_libsym = 0;
+	}
+
+done:
+	free(nbp);
+	if (own_libsym) {
+		library_symbol_destroy(libsym);
+		free(libsym);
+	}
+	fetch_arg_done(fetch);
+}
+
+static int
+create_ifunc_ret_bp(struct breakpoint **ret,
+		    struct breakpoint *bp, struct process *proc)
+{
+	*ret = create_default_return_bp(proc);
+	if (*ret == NULL)
+		return -1;
+	static struct bp_callbacks cbs = {
+		.on_hit = ifunc_ret_hit,
+	};
+	breakpoint_set_callbacks(*ret, &cbs);
+
+	(*ret)->os.ret_libsym = bp->libsym;
+
+	return 0;
+}
+
+int
+os_breakpoint_init(struct process *proc, struct breakpoint *bp)
+{
+	if (bp->libsym != NULL && bp->libsym->os.is_ifunc) {
+		static struct bp_callbacks cbs = {
+			.get_return_bp = create_ifunc_ret_bp,
+		};
+		breakpoint_set_callbacks(bp, &cbs);
+	}
+	return 0;
+}
+
+void
+os_breakpoint_destroy(struct breakpoint *bp)
+{
+}
+
+int
+os_breakpoint_clone(struct breakpoint *retp, struct breakpoint *bp)
+{
+	return 0;
+}
diff --git a/sysdeps/linux-gnu/trace.h b/sysdeps/linux-gnu/trace.h
index 88ac33d..94844dd 100644
--- a/sysdeps/linux-gnu/trace.h
+++ b/sysdeps/linux-gnu/trace.h
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2011,2012,2013 Petr Machata, Red Hat Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -59,13 +59,13 @@ struct process_stopping_handler
 	struct event_handler super;
 
 	/* The task that is doing the re-enablement.  */
-	struct Process *task_enabling_breakpoint;
+	struct process *task_enabling_breakpoint;
 
 	/* The pointer being re-enabled.  */
 	struct breakpoint *breakpoint_being_enabled;
 
-	/* Artificial atomic skip breakpoint, if any needed.  */
-	void *atomic_skip_bp_addrs[2];
+	/* Software singlestep breakpoints, if any needed.  */
+	struct breakpoint *sws_bps[2];
 
 	/* When all tasks are stopped, this callback gets called.  */
 	void (*on_all_stopped)(struct process_stopping_handler *);
@@ -84,17 +84,17 @@ struct process_stopping_handler
 
 	enum {
 		/* We are waiting for everyone to land in t/T.  */
-		psh_stopping = 0,
+		PSH_STOPPING = 0,
 
 		/* We are doing the PTRACE_SINGLESTEP.  */
-		psh_singlestep,
+		PSH_SINGLESTEP,
 
 		/* We are waiting for all the SIGSTOPs to arrive so
 		 * that we can sink them.  */
-		psh_sinking,
+		PSH_SINKING,
 
 		/* This is for tracking the ugly workaround.  */
-		psh_ugly_workaround,
+		PSH_UGLY_WORKAROUND,
 	} state;
 
 	int exiting;
@@ -108,7 +108,7 @@ struct process_stopping_handler
  * ON_ALL_STOPPED is LINUX_PTRACE_DISABLE_AND_SINGLESTEP, the default
  * for KEEP_STEPPING_P and UGLY_WORKAROUND_P is "no".  */
 int process_install_stopping_handler
-	(struct Process *proc, struct breakpoint *sbp,
+	(struct process *proc, struct breakpoint *sbp,
 	 void (*on_all_stopped)(struct process_stopping_handler *),
 	 enum callback_status (*keep_stepping_p)
 		 (struct process_stopping_handler *),
@@ -118,4 +118,37 @@ int process_install_stopping_handler
 void linux_ptrace_disable_and_singlestep(struct process_stopping_handler *self);
 void linux_ptrace_disable_and_continue(struct process_stopping_handler *self);
 
+/* When main binary needs to call an IFUNC function defined in the
+ * binary itself, a PLT entry is set up so that dynamic linker can get
+ * involved and resolve the symbol.  But unlike other PLT relocation,
+ * this one can't rely on symbol table being available.  So it doesn't
+ * reference the symbol by its name, but by its address, and
+ * correspondingly, has another type.  When arch backend wishes to
+ * support these IRELATIVE relocations, it should override
+ * arch_elf_add_plt_entry and dispatch to this function for IRELATIVE
+ * relocations.
+ *
+ * This function behaves as arch_elf_add_plt_entry, except that it
+ * doesn't take name for a parameter, but instead looks up the name in
+ * symbol tables in LTE.  */
+enum plt_status linux_elf_add_plt_entry_irelative(struct process *proc,
+						  struct ltelf *lte,
+						  GElf_Rela *rela, size_t ndx,
+						  struct library_symbol **ret);
+
+/* Service routine of the above.  Determines a name corresponding to
+ * ADDR, or invents a new one.  Returns NULL on failures, otherwise it
+ * returns a malloc'd pointer that the caller is responsible for
+ * freeing.  */
+char *linux_elf_find_irelative_name(struct ltelf *lte, GElf_Addr addr);
+
+/* Returns ${NAME}.IFUNC in a newly-malloc'd block, or NULL on
+ * failures.  */
+char *linux_append_IFUNC_to_name(const char *name);
+
+/* Returns a statically allocated prototype that represents the
+ * prototype "void *()".  Never fails.  */
+struct prototype *linux_IFUNC_prototype(void);
+
+
 #endif /* _LTRACE_LINUX_TRACE_H_ */
diff --git a/sysdeps/linux-gnu/x86/Makefile.in b/sysdeps/linux-gnu/x86/Makefile.in
deleted file mode 100644
index bb7bc9f..0000000
--- a/sysdeps/linux-gnu/x86/Makefile.in
+++ /dev/null
@@ -1,532 +0,0 @@
-# Makefile.in generated by automake 1.11.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
-# Inc.
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# This file is part of ltrace.
-# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
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-
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-INSTALL_HEADER = $(INSTALL_DATA)
-transform = $(program_transform_name)
-NORMAL_INSTALL = :
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-	  fi; \
-	fi
-ctags: CTAGS
-CTAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
-		$(TAGS_FILES) $(LISP)
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
-	unique=`for i in $$list; do \
-	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
-	  done | \
-	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
-	      END { if (nonempty) { for (i in files) print i; }; }'`; \
-	test -z "$(CTAGS_ARGS)$$unique" \
-	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
-	     $$unique
-
-GTAGS:
-	here=`$(am__cd) $(top_builddir) && pwd` \
-	  && $(am__cd) $(top_srcdir) \
-	  && gtags -i $(GTAGS_ARGS) "$$here"
-
-distclean-tags:
-	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
-
-distdir: $(DISTFILES)
-	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
-	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
-	list='$(DISTFILES)'; \
-	  dist_files=`for file in $$list; do echo $$file; done | \
-	  sed -e "s|^$$srcdirstrip/||;t" \
-	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
-	case $$dist_files in \
-	  */*) $(MKDIR_P) `echo "$$dist_files" | \
-			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
-			   sort -u` ;; \
-	esac; \
-	for file in $$dist_files; do \
-	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
-	  if test -d $$d/$$file; then \
-	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
-	    if test -d "$(distdir)/$$file"; then \
-	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
-	    fi; \
-	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
-	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
-	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
-	    fi; \
-	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
-	  else \
-	    test -f "$(distdir)/$$file" \
-	    || cp -p $$d/$$file "$(distdir)/$$file" \
-	    || exit 1; \
-	  fi; \
-	done
-check-am: all-am
-check: check-am
-all-am: Makefile $(LTLIBRARIES) $(HEADERS)
-installdirs:
-install: install-am
-install-exec: install-exec-am
-install-data: install-data-am
-uninstall: uninstall-am
-
-install-am: all-am
-	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
-
-installcheck: installcheck-am
-install-strip:
-	$(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
-	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
-	  `test -z '$(STRIP)' || \
-	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
-mostlyclean-generic:
-
-clean-generic:
-
-distclean-generic:
-	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
-	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
-	-rm -f ../$(am__dirstamp)
-
-maintainer-clean-generic:
-	@echo "This command is intended for maintainers to use"
-	@echo "it deletes files that may require special tools to rebuild."
-	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
-clean: clean-am
-
-clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
-	mostlyclean-am
-
-distclean: distclean-am
-	-rm -rf ./$(DEPDIR)
-	-rm -f Makefile
-distclean-am: clean-am distclean-compile distclean-generic \
-	distclean-tags
-
-dvi: dvi-am
-
-dvi-am:
-
-html: html-am
-
-html-am:
-
-info: info-am
-
-info-am:
-
-install-data-am:
-
-install-dvi: install-dvi-am
-
-install-dvi-am:
-
-install-exec-am:
-
-install-html: install-html-am
-
-install-html-am:
-
-install-info: install-info-am
-
-install-info-am:
-
-install-man:
-
-install-pdf: install-pdf-am
-
-install-pdf-am:
-
-install-ps: install-ps-am
-
-install-ps-am:
-
-installcheck-am:
-
-maintainer-clean: maintainer-clean-am
-	-rm -rf ./$(DEPDIR)
-	-rm -f Makefile
-maintainer-clean-am: distclean-am maintainer-clean-generic
-
-mostlyclean: mostlyclean-am
-
-mostlyclean-am: mostlyclean-compile mostlyclean-generic \
-	mostlyclean-libtool
-
-pdf: pdf-am
-
-pdf-am:
-
-ps: ps-am
-
-ps-am:
-
-uninstall-am:
-
-.MAKE: install-am install-strip
-
-.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \
-	clean-libtool clean-noinstLTLIBRARIES ctags distclean \
-	distclean-compile distclean-generic distclean-libtool \
-	distclean-tags distdir dvi dvi-am html html-am info info-am \
-	install install-am install-data install-data-am install-dvi \
-	install-dvi-am install-exec install-exec-am install-html \
-	install-html-am install-info install-info-am install-man \
-	install-pdf install-pdf-am install-ps install-ps-am \
-	install-strip installcheck installcheck-am installdirs \
-	maintainer-clean maintainer-clean-generic mostlyclean \
-	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
-	pdf pdf-am ps ps-am tags uninstall uninstall-am
-
-
-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/sysdeps/linux-gnu/x86/arch.h b/sysdeps/linux-gnu/x86/arch.h
index 329cfba..da5bd33 100644
--- a/sysdeps/linux-gnu/x86/arch.h
+++ b/sysdeps/linux-gnu/x86/arch.h
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2011, 2012 Petr Machata
+ * Copyright (C) 2011,2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2006 Ian Wienand
  * Copyright (C) 2004 Juan Cespedes
  *
@@ -28,6 +28,8 @@
 #define ARCH_HAVE_ALIGNOF
 #define ARCH_ENDIAN_LITTLE
 
+#define ARCH_HAVE_ADD_PLT_ENTRY
+
 #ifdef __x86_64__
 #define LT_ELFCLASS	ELFCLASS64
 #define LT_ELF_MACHINE	EM_X86_64
diff --git a/sysdeps/linux-gnu/x86/fetch.c b/sysdeps/linux-gnu/x86/fetch.c
index 4dab4cc..6868101 100644
--- a/sysdeps/linux-gnu/x86/fetch.c
+++ b/sysdeps/linux-gnu/x86/fetch.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2011,2012 Petr Machata
+ * Copyright (C) 2011,2012,2013 Petr Machata
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -58,9 +58,10 @@ struct fetch_context
 	struct user_regs_struct iregs;
 	struct user_fpregs_struct fpregs;
 
-	void *stack_pointer;
+	arch_addr_t stack_pointer;
 	size_t ireg;	/* Used-up integer registers.  */
 	size_t freg;	/* Used-up floating registers.  */
+	int machine;
 
 	union {
 		struct {
@@ -137,14 +138,14 @@ allocate_stack_slot(struct fetch_context *context,
 		    struct value *valuep, size_t sz, size_t offset,
 		    size_t archw)
 {
+	assert(valuep != NULL);
 	size_t a = type_alignof(valuep->inferior, valuep->type);
 	if (a < archw)
 		a = archw;
 	context->stack_pointer
 		= (void *)align((unsigned long)context->stack_pointer, a);
 
-	if (valuep != NULL)
-		value_in_inferior(valuep, context->stack_pointer);
+	value_in_inferior(valuep, context->stack_pointer);
 	context->stack_pointer += sz;
 }
 
@@ -238,21 +239,42 @@ allocate_integer(struct fetch_context *context, struct value *valuep,
 
 	case POOL_SYSCALL:
 #ifdef __x86_64__
-		switch (context->ireg) {
-			HANDLE(0, rdi);
-			HANDLE(1, rsi);
-			HANDLE(2, rdx);
-			HANDLE(3, r10);
-			HANDLE(4, r8);
-			HANDLE(5, r9);
-		default:
-			assert(!"More than six syscall arguments???");
-			abort();
+		if (context->machine == EM_X86_64) {
+			switch (context->ireg) {
+				HANDLE(0, rdi);
+				HANDLE(1, rsi);
+				HANDLE(2, rdx);
+				HANDLE(3, r10);
+				HANDLE(4, r8);
+				HANDLE(5, r9);
+			default:
+				assert(!"More than six syscall arguments???");
+				abort();
+			}
 		}
+#endif
+		if (context->machine == EM_386) {
+
+#ifdef __x86_64__
+# define HANDLE32(NUM, WHICH) HANDLE(NUM, r##WHICH)
 #else
-		i386_unreachable();
+# define HANDLE32(NUM, WHICH) HANDLE(NUM, e##WHICH)
 #endif
 
+			switch (context->ireg) {
+				HANDLE32(0, bx);
+				HANDLE32(1, cx);
+				HANDLE32(2, dx);
+				HANDLE32(3, si);
+				HANDLE32(4, di);
+				HANDLE32(5, bp);
+			default:
+				assert(!"More than six syscall arguments???");
+				abort();
+			}
+#undef HANDLE32
+		}
+
 	case POOL_RETVAL:
 		switch (context->ireg) {
 #ifdef __x86_64__
@@ -323,14 +345,14 @@ allocate_class(enum arg_class cls, struct fetch_context *context,
 }
 
 static ssize_t
-classify(struct Process *proc, struct fetch_context *context,
-	 struct arg_type_info *info, struct value *valuep, enum arg_class classes[],
+classify(struct process *proc, struct fetch_context *context,
+	 struct arg_type_info *info, enum arg_class classes[],
 	 size_t sz, size_t eightbytes);
 
 /* This classifies one eightbyte part of an array or struct.  */
 static ssize_t
-classify_eightbyte(struct Process *proc, struct fetch_context *context,
-		   struct arg_type_info *info, struct value *valuep,
+classify_eightbyte(struct process *proc, struct fetch_context *context,
+		   struct arg_type_info *info,
 		   enum arg_class *classp, size_t start, size_t end,
 		   struct arg_type_info *(*getter)(struct arg_type_info *,
 						   size_t))
@@ -343,7 +365,7 @@ classify_eightbyte(struct Process *proc, struct fetch_context *context,
 		size_t sz = type_sizeof(proc, info2);
 		if (sz == (size_t)-1)
 			return -1;
-		if (classify(proc, context, info2, valuep, &cls2, sz, 1) < 0)
+		if (classify(proc, context, info2, &cls2, sz, 1) < 0)
 			return -1;
 
 		if (cls == CLASS_NO)
@@ -364,8 +386,8 @@ classify_eightbyte(struct Process *proc, struct fetch_context *context,
 
 /* This classifies small arrays and structs.  */
 static ssize_t
-classify_eightbytes(struct Process *proc, struct fetch_context *context,
-		    struct arg_type_info *info, struct value *valuep,
+classify_eightbytes(struct process *proc, struct fetch_context *context,
+		    struct arg_type_info *info,
 		    enum arg_class classes[], size_t elements,
 		    size_t eightbytes,
 		    struct arg_type_info *(*getter)(struct arg_type_info *,
@@ -384,9 +406,9 @@ classify_eightbytes(struct Process *proc, struct fetch_context *context,
 			}
 
 		enum arg_class cls1, cls2;
-		if (classify_eightbyte(proc, context, info, valuep, &cls1,
+		if (classify_eightbyte(proc, context, info, &cls1,
 				       0, start_2nd, getter) < 0
-		    || classify_eightbyte(proc, context, info, valuep, &cls2,
+		    || classify_eightbyte(proc, context, info, &cls2,
 					  start_2nd, elements, getter) < 0)
 			return -1;
 
@@ -400,7 +422,7 @@ classify_eightbytes(struct Process *proc, struct fetch_context *context,
 		return 2;
 	}
 
-	return classify_eightbyte(proc, context, info, valuep, classes,
+	return classify_eightbyte(proc, context, info, classes,
 				  0, elements, getter);
 }
 
@@ -432,8 +454,8 @@ flatten_structure(struct arg_type_info *flattened, struct arg_type_info *info)
 }
 
 static ssize_t
-classify(struct Process *proc, struct fetch_context *context,
-	 struct arg_type_info *info, struct value *valuep, enum arg_class classes[],
+classify(struct process *proc, struct fetch_context *context,
+	 struct arg_type_info *info, enum arg_class classes[],
 	 size_t sz, size_t eightbytes)
 {
 	switch (info->type) {
@@ -474,7 +496,7 @@ classify(struct Process *proc, struct fetch_context *context,
 		if (expr_eval_constant(info->u.array_info.length, &l) < 0)
 			return -1;
 
-		return classify_eightbytes(proc, context, info, valuep, classes,
+		return classify_eightbytes(proc, context, info, classes,
 					   (size_t)l, eightbytes,
 					   get_array_field);
 
@@ -492,7 +514,7 @@ classify(struct Process *proc, struct fetch_context *context,
 			goto done;
 		}
 		ret = classify_eightbytes(proc, context, &flattened,
-					  valuep, classes,
+					  classes,
 					  type_struct_size(&flattened),
 					  eightbytes, type_struct_get);
 	done:
@@ -517,7 +539,7 @@ pass_by_reference(struct value *valuep, enum arg_class classes[])
 }
 
 static ssize_t
-classify_argument(struct Process *proc, struct fetch_context *context,
+classify_argument(struct process *proc, struct fetch_context *context,
 		  struct arg_type_info *info, struct value *valuep,
 		  enum arg_class classes[], size_t *sizep)
 {
@@ -541,11 +563,11 @@ classify_argument(struct Process *proc, struct fetch_context *context,
 			return pass_by_reference(valuep, classes);
 	}
 
-	return classify(proc, context, info, valuep, classes, sz, eightbytes);
+	return classify(proc, context, info, classes, sz, eightbytes);
 }
 
 static int
-fetch_register_banks(struct Process *proc, struct fetch_context *context,
+fetch_register_banks(struct process *proc, struct fetch_context *context,
 		     int floating)
 {
 	if (ptrace(PTRACE_GETREGS, proc->pid, 0, &context->iregs) < 0)
@@ -566,12 +588,21 @@ fetch_register_banks(struct Process *proc, struct fetch_context *context,
 
 static int
 arch_fetch_arg_next_32(struct fetch_context *context, enum tof type,
-		       struct Process *proc, struct arg_type_info *info,
+		       struct process *proc, struct arg_type_info *info,
 		       struct value *valuep)
 {
 	size_t sz = type_sizeof(proc, info);
 	if (sz == (size_t)-1)
 		return -1;
+	if (value_reserve(valuep, sz) == NULL)
+		return -1;
+
+	if (type == LT_TOF_SYSCALL || type == LT_TOF_SYSCALLR) {
+		int cls = allocate_integer(context, valuep,
+					   sz, 0, POOL_SYSCALL);
+		assert(cls == CLASS_INTEGER);
+		return 0;
+	}
 
 	allocate_stack_slot(context, valuep, sz, 0, 4);
 
@@ -580,7 +611,7 @@ arch_fetch_arg_next_32(struct fetch_context *context, enum tof type,
 
 static int
 arch_fetch_retval_32(struct fetch_context *context, enum tof type,
-		     struct Process *proc, struct arg_type_info *info,
+		     struct process *proc, struct arg_type_info *info,
 		     struct value *valuep)
 {
 	if (fetch_register_banks(proc, context, type == LT_TOF_FUNCTIONR) < 0)
@@ -646,7 +677,7 @@ fetch_stack_pointer(struct fetch_context *context)
 
 struct fetch_context *
 arch_fetch_arg_init_32(struct fetch_context *context,
-		       enum tof type, struct Process *proc,
+		       enum tof type, struct process *proc,
 		       struct arg_type_info *ret_info)
 {
 	context->stack_pointer = fetch_stack_pointer(context) + 4;
@@ -673,7 +704,7 @@ arch_fetch_arg_init_32(struct fetch_context *context,
 
 struct fetch_context *
 arch_fetch_arg_init_64(struct fetch_context *ctx, enum tof type,
-		       struct Process *proc, struct arg_type_info *ret_info)
+		       struct process *proc, struct arg_type_info *ret_info)
 {
 	/* The first stack slot holds a return address.  */
 	ctx->stack_pointer = fetch_stack_pointer(ctx) + 8;
@@ -698,12 +729,13 @@ arch_fetch_arg_init_64(struct fetch_context *ctx, enum tof type,
 }
 
 struct fetch_context *
-arch_fetch_arg_init(enum tof type, struct Process *proc,
+arch_fetch_arg_init(enum tof type, struct process *proc,
 		    struct arg_type_info *ret_info)
 {
 	struct fetch_context *ctx = malloc(sizeof(*ctx));
 	if (ctx == NULL)
 		return NULL;
+	ctx->machine = proc->e_machine;
 
 	assert(type != LT_TOF_FUNCTIONR
 	       && type != LT_TOF_SYSCALLR);
@@ -724,7 +756,7 @@ arch_fetch_arg_init(enum tof type, struct Process *proc,
 }
 
 struct fetch_context *
-arch_fetch_arg_clone(struct Process *proc, struct fetch_context *context)
+arch_fetch_arg_clone(struct process *proc, struct fetch_context *context)
 {
 	struct fetch_context *ret = malloc(sizeof(*ret));
 	if (ret == NULL)
@@ -734,7 +766,7 @@ arch_fetch_arg_clone(struct Process *proc, struct fetch_context *context)
 
 static int
 arch_fetch_pool_arg_next(struct fetch_context *context, enum tof type,
-			 struct Process *proc, struct arg_type_info *info,
+			 struct process *proc, struct arg_type_info *info,
 			 struct value *valuep, enum reg_pool pool)
 {
 	enum arg_class classes[2];
@@ -776,7 +808,7 @@ arch_fetch_pool_arg_next(struct fetch_context *context, enum tof type,
 
 int
 arch_fetch_fun_retval(struct fetch_context *context, enum tof type,
-		      struct Process *proc, struct arg_type_info *info,
+		      struct process *proc, struct arg_type_info *info,
 		      struct value *valuep)
 {
 	assert(type != LT_TOF_FUNCTION
@@ -808,7 +840,7 @@ arch_fetch_fun_retval(struct fetch_context *context, enum tof type,
 
 int
 arch_fetch_arg_next(struct fetch_context *context, enum tof type,
-		    struct Process *proc, struct arg_type_info *info,
+		    struct process *proc, struct arg_type_info *info,
 		    struct value *valuep)
 {
 	if (proc->e_machine == EM_386)
@@ -832,7 +864,7 @@ arch_fetch_arg_next(struct fetch_context *context, enum tof type,
 
 int
 arch_fetch_retval(struct fetch_context *context, enum tof type,
-		  struct Process *proc, struct arg_type_info *info,
+		  struct process *proc, struct arg_type_info *info,
 		  struct value *valuep)
 {
 	if (proc->e_machine == EM_386)
diff --git a/sysdeps/linux-gnu/x86/plt.c b/sysdeps/linux-gnu/x86/plt.c
index dc6f183..6d11987 100644
--- a/sysdeps/linux-gnu/x86/plt.c
+++ b/sysdeps/linux-gnu/x86/plt.c
@@ -1,5 +1,6 @@
 /*
  * This file is part of ltrace.
+ * Copyright (C) 2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 2004,2008,2009 Juan Cespedes
  *
  * This program is free software; you can redistribute it and/or
@@ -19,16 +20,45 @@
  */
 
 #include <gelf.h>
+#include <stdbool.h>
+
 #include "proc.h"
 #include "common.h"
 #include "library.h"
+#include "trace.h"
 
 GElf_Addr
-arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela) {
+arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela *rela)
+{
 	return lte->plt_addr + (ndx + 1) * 16;
 }
 
 void *
-sym2addr(Process *proc, struct library_symbol *sym) {
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
 	return sym->enter_addr;
 }
+
+enum plt_status
+arch_elf_add_plt_entry(struct process *proc, struct ltelf *lte,
+		       const char *a_name, GElf_Rela *rela, size_t ndx,
+		       struct library_symbol **ret)
+{
+	bool irelative = false;
+	if (lte->ehdr.e_machine == EM_X86_64) {
+#ifdef R_X86_64_IRELATIVE
+		irelative = GELF_R_TYPE(rela->r_info) == R_X86_64_IRELATIVE;
+#endif
+	} else {
+		assert(lte->ehdr.e_machine == EM_386);
+#ifdef R_386_IRELATIVE
+		irelative = GELF_R_TYPE(rela->r_info) == R_386_IRELATIVE;
+#endif
+	}
+
+	if (irelative)
+		return linux_elf_add_plt_entry_irelative(proc, lte, rela,
+							 ndx, ret);
+
+	return PLT_DEFAULT;
+}
diff --git a/sysdeps/linux-gnu/x86/regs.c b/sysdeps/linux-gnu/x86/regs.c
index ca6470b..0a42c6e 100644
--- a/sysdeps/linux-gnu/x86/regs.c
+++ b/sysdeps/linux-gnu/x86/regs.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2012,2013 Petr Machata, Red Hat Inc.
  * Copyright (C) 1998,2002,2004,2008,2009 Juan Cespedes
  * Copyright (C) 2006 Ian Wienand
  *
@@ -56,7 +56,7 @@ conv_32(arch_addr_t val)
 }
 
 void *
-get_instruction_pointer(struct Process *proc)
+get_instruction_pointer(struct process *proc)
 {
 	long int ret = ptrace(PTRACE_PEEKUSER, proc->pid, XIP, 0);
 	if (proc->e_machine == EM_386)
@@ -65,7 +65,7 @@ get_instruction_pointer(struct Process *proc)
 }
 
 void
-set_instruction_pointer(struct Process *proc, arch_addr_t addr)
+set_instruction_pointer(struct process *proc, arch_addr_t addr)
 {
 	if (proc->e_machine == EM_386)
 		addr = conv_32(addr);
@@ -73,7 +73,7 @@ set_instruction_pointer(struct Process *proc, arch_addr_t addr)
 }
 
 void *
-get_stack_pointer(struct Process *proc)
+get_stack_pointer(struct process *proc)
 {
 	long sp = ptrace(PTRACE_PEEKUSER, proc->pid, XSP, 0);
 	if (sp == -1 && errno) {
@@ -91,7 +91,7 @@ get_stack_pointer(struct Process *proc)
 }
 
 void *
-get_return_addr(struct Process *proc, void *sp)
+get_return_addr(struct process *proc, void *sp)
 {
 	long a = ptrace(PTRACE_PEEKTEXT, proc->pid, sp, 0);
 	if (a == -1 && errno) {
@@ -107,10 +107,3 @@ get_return_addr(struct Process *proc, void *sp)
 		ret = conv_32(ret);
 	return ret;
 }
-
-void
-set_return_addr(Process *proc, void *addr) {
-	if (proc->e_machine == EM_386)
-		addr = (void *)((long int)addr & 0xffffffff);
-	ptrace(PTRACE_POKETEXT, proc->pid, proc->stack_pointer, addr);
-}
diff --git a/sysdeps/linux-gnu/x86/trace.c b/sysdeps/linux-gnu/x86/trace.c
index ed8bdb4..6a1a6a5 100644
--- a/sysdeps/linux-gnu/x86/trace.c
+++ b/sysdeps/linux-gnu/x86/trace.c
@@ -55,7 +55,7 @@ static const int x86_64 = 0;
 #endif
 
 void
-get_arch_dep(struct Process *proc)
+get_arch_dep(struct process *proc)
 {
 	/* Unfortunately there are still remnants of mask_32bit uses
 	 * around.  */
@@ -75,7 +75,7 @@ get_arch_dep(struct Process *proc)
 /* Returns 1 if syscall, 2 if sysret, 0 otherwise.
  */
 int
-syscall_p(struct Process *proc, int status, int *sysnum)
+syscall_p(struct process *proc, int status, int *sysnum)
 {
 	if (WIFSTOPPED(status)
 	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
@@ -109,7 +109,7 @@ syscall_p(struct Process *proc, int status, int *sysnum)
 }
 
 size_t
-arch_type_sizeof(struct Process *proc, struct arg_type_info *info)
+arch_type_sizeof(struct process *proc, struct arg_type_info *info)
 {
 	if (proc == NULL)
 		return (size_t)-2;
@@ -151,7 +151,7 @@ arch_type_sizeof(struct Process *proc, struct arg_type_info *info)
 }
 
 size_t
-arch_type_alignof(struct Process *proc, struct arg_type_info *info)
+arch_type_alignof(struct process *proc, struct arg_type_info *info)
 {
 	if (proc == NULL)
 		return (size_t)-2;
diff --git a/sysdeps/sysdep.h b/sysdeps/sysdep.h
index e8e287f..24c9341 100644
--- a/sysdeps/sysdep.h
+++ b/sysdeps/sysdep.h
@@ -1,6 +1,6 @@
 /*
  * This file is part of ltrace.
- * Copyright (C) 2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2012,2013 Petr Machata, Red Hat Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -24,10 +24,11 @@
 #include <arch.h>
 #ifndef ARCH_HAVE_ADDRESS_TYPES
 /* We should in general be able to trace 64-bit processes with 32-bit
- * ltrace.  (At least PPC has several PTRACE requests related to
- * tracing 64-on-32, so presumably it should be possible.)  But ltrace
- * is currently hopelessly infested with using void* for host address.
- * So keep with it, for now.  */
+ * ltrace (this is possible on PPC, and generally there should be no
+ * problem tracing x86_64 processes from x32 ltrace, though it isn't
+ * possible from i386 ltrace).  But ltrace is currently hopelessly
+ * infested with using void* for host address.  So keep with it, for
+ * now.  */
 typedef void *arch_addr_t;
 #endif
 
@@ -38,16 +39,31 @@ struct arch_ltelf_data {
 };
 #endif
 
+#ifndef OS_HAVE_BREAKPOINT_DATA
+struct os_breakpoint_data {
+};
+#endif
+
 #ifndef ARCH_HAVE_BREAKPOINT_DATA
 struct arch_breakpoint_data {
 };
 #endif
 
+#ifndef OS_HAVE_LIBRARY_SYMBOL_DATA
+struct os_library_symbol_data {
+};
+#endif
+
 #ifndef ARCH_HAVE_LIBRARY_SYMBOL_DATA
 struct arch_library_symbol_data {
 };
 #endif
 
+#ifndef OS_HAVE_LIBRARY_DATA
+struct os_library_data {
+};
+#endif
+
 #ifndef ARCH_HAVE_LIBRARY_DATA
 struct arch_library_data {
 };