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/*
* This file is part of ltrace.
* Copyright (C) 2012,2013,2014 Petr Machata
* Copyright (C) 2006 Paul Gilliam
* Copyright (C) 2002,2004 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
*/
#ifndef LTRACE_PPC_ARCH_H
#define LTRACE_PPC_ARCH_H
#include <gelf.h>
#include <stdbool.h>
#define BREAKPOINT_LENGTH 4
#define DECR_PC_AFTER_BREAK 0
#define LT_ELFCLASS ELFCLASS32
#define LT_ELF_MACHINE EM_PPC
#ifdef __powerpc64__ // Says 'ltrace' is 64 bits, says nothing about target.
# define LT_ELFCLASS2 ELFCLASS64
# define LT_ELF_MACHINE2 EM_PPC64
# ifdef __LITTLE_ENDIAN__
# define BREAKPOINT_VALUE { 0x08, 0x00, 0xe0, 0x7f }
# define ARCH_ENDIAN_LITTLE
# else
# define BREAKPOINT_VALUE { 0x7f, 0xe0, 0x00, 0x08 }
# define ARCH_SUPPORTS_OPD
# define ARCH_ENDIAN_BIG
# endif
# if !defined(_CALL_ELF) || _CALL_ELF < 2
# define ARCH_SUPPORTS_OPD
# define STACK_FRAME_OVERHEAD 112
# ifndef EF_PPC64_ABI
# define EF_PPC64_ABI 3
# endif
# elif _CALL_ELF == 2 /* ELFv2 ABI */
# define STACK_FRAME_OVERHEAD 32
# else
# error Unsupported PowerPC64 ABI.
# endif /* CALL_ELF */
#else
# define BREAKPOINT_VALUE { 0x7f, 0xe0, 0x00, 0x08 }
# define ARCH_ENDIAN_BIG
# define STACK_FRAME_OVERHEAD 112
# ifndef EF_PPC64_ABI
# define EF_PPC64_ABI 3
# endif
#endif /* __powerpc64__ */
#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
#define ARCH_HAVE_SIZEOF
#define ARCH_HAVE_ALIGNOF
struct library_symbol;
#define ARCH_HAVE_LTELF_DATA
struct arch_ltelf_data {
GElf_Addr plt_stub_vma;
struct library_symbol *stubs;
Elf_Data *opd_data;
GElf_Addr opd_base;
GElf_Xword opd_size;
bool secure_plt : 1;
bool elfv2_abi : 1;
Elf_Data *reladyn;
size_t reladyn_count;
};
#define ARCH_HAVE_LIBRARY_DATA
struct arch_library_data {
GElf_Addr pltgot_addr;
int bss_plt_prelinked;
};
enum ppc64_plt_type {
/* Either a non-PLT symbol, or PPC32 symbol. */
PPC_DEFAULT = 0,
/* PPC64 STUB, never resolved. */
PPC64_PLT_STUB,
/* Unresolved PLT symbol (.plt contains PLT address). */
PPC_PLT_UNRESOLVED,
/* Resolved PLT symbol. The corresponding .plt slot contained
* target address, which was changed to the address of
* 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,
/* Transitional state before the breakpoint is enabled. */
PPC_PLT_NEED_UNRESOLVE,
};
#define ARCH_HAVE_LIBRARY_SYMBOL_DATA
struct ppc_unresolve_data;
struct arch_library_symbol_data {
enum ppc64_plt_type type;
/* State Contents
*
* PPC_DEFAULT N/A
* PPC64_PLT_STUB N/A
* PPC_PLT_UNRESOLVED PLT entry address.
* PPC_PLT_IRELATIVE Likewise.
* PPC_PLT_RESOLVED The original value the slot was resolved to.
* PPC_PLT_NEED_UNRESOLVE DATA.
*/
union {
GElf_Addr resolved_value;
struct ppc_unresolve_data *data;
};
/* Address of corresponding slot in .plt. */
GElf_Addr plt_slot_addr;
};
#define ARCH_HAVE_BREAKPOINT_DATA
struct arch_breakpoint_data {
/* 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
struct arch_process_data {
/* Breakpoint that hits when the dynamic linker is about to
* update a .plt slot. NULL before that address is known. */
struct breakpoint *dl_plt_update_bp;
/* PLT update breakpoint looks here for the handler. */
struct process_stopping_handler *handler;
};
#endif /* LTRACE_PPC_ARCH_H */
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