regs.c revision e99af270a60891e68d465c4cd97dbe29cd1a05e4 
1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2010 Edgar E. Iglesias
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 */
20
21#if HAVE_CONFIG_H
22#include "config.h"
23#endif
24
25#include <sys/types.h>
26#include <sys/ptrace.h>
27#include <asm/ptrace.h>
28
29#include "proc.h"
30#include "common.h"
31
32#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
33# define PTRACE_PEEKUSER PTRACE_PEEKUSR
34#endif
35
36#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
37# define PTRACE_POKEUSER PTRACE_POKEUSR
38#endif
39
40void *get_instruction_pointer(Process *proc)
41{
42	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_PPC, 0);
43}
44
45void set_instruction_pointer(Process *proc, void *addr)
46{
47	ptrace(PTRACE_POKEUSER, proc->pid, 4 * PT_PPC, addr);
48}
49
50void *get_stack_pointer(Process *proc)
51{
52	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_USP, 0);
53}
54
55void *get_return_addr(Process *proc, void *stack_pointer)
56{
57	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_SRP, 0);
58}
59