1 files changed, 84 insertions, 0 deletions
diff --git a/sysdeps/linux-gnu/aarch64/trace.c b/sysdeps/linux-gnu/aarch64/trace.c
new file mode 100644
index 0000000..4f31113
--- /dev/null
+++ b/sysdeps/linux-gnu/aarch64/trace.c
@@ -0,0 +1,84 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2014 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 <sys/types.h>
+#include <sys/wait.h>
+#include <asm/ptrace.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "backend.h"
+#include "proc.h"
+
+void
+get_arch_dep(struct process *proc)
+{
+}
+
+int aarch64_read_gregs(struct process *proc, struct user_pt_regs *regs);
+
+/* The syscall instruction is:
+ * | 31                   21 | 20    5 | 4       0 |
+ * | 1 1 0 1 0 1 0 0 | 0 0 0 |  imm16  | 0 0 0 0 1 | */
+#define SVC_MASK  0xffe0001f
+#define SVC_VALUE 0xd4000001
+
+int
+syscall_p(struct process *proc, int status, int *sysnum)
+{
+	if (WIFSTOPPED(status)
+	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
+
+		struct user_pt_regs regs;
+		if (aarch64_read_gregs(proc, &regs) < 0) {
+			fprintf(stderr, "syscall_p: "
+				"Couldn't read registers of %d.\n", proc->pid);
+			return -1;
+		}
+
+		errno = 0;
+		unsigned long insn = (unsigned long) ptrace(PTRACE_PEEKTEXT,
+							    proc->pid,
+							    regs.pc - 4, 0);
+		if (insn == -1UL && errno != 0) {
+			fprintf(stderr, "syscall_p: "
+				"Couldn't peek into %d: %s\n", proc->pid,
+				strerror(errno));
+			return -1;
+		}
+
+		insn &= 0xffffffffUL;
+		if ((insn & SVC_MASK) == SVC_VALUE) {
+			*sysnum = regs.regs[8];
+
+			size_t d1 = proc->callstack_depth - 1;
+			if (proc->callstack_depth > 0
+			    && proc->callstack[d1].is_syscall
+			    && proc->callstack[d1].c_un.syscall == *sysnum)
+				return 2;
+
+			return 1;
+		}
+	}
+
+	return 0;
+}