regs.c revision 929bd57ca202fd2f2e8485ebf65d683e664f67b5 
1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2002,2008,2009 Juan Cespedes
4 * Copyright (C) 2009 Juan Cespedes
5 * Copyright (C) 2008 Luis Machado, IBM Corporation
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23#include "config.h"
24
25#include <sys/types.h>
26#include <sys/ptrace.h>
27#include <asm/ptrace.h>
28#include <errno.h>
29#include <error.h>
30
31#include "proc.h"
32#include "common.h"
33
34#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
35# define PTRACE_PEEKUSER PTRACE_PEEKUSR
36#endif
37
38#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
39# define PTRACE_POKEUSER PTRACE_POKEUSR
40#endif
41
42void *
43get_instruction_pointer(struct process *proc)
44{
45	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_NIP, 0);
46}
47
48void
49set_instruction_pointer(struct process *proc, void *addr)
50{
51	if (ptrace(PTRACE_POKEUSER, proc->pid, sizeof(long)*PT_NIP, addr) != 0)
52		error(0, errno, "set_instruction_pointer");
53}
54
55void *
56get_stack_pointer(struct process *proc)
57{
58	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_R1, 0);
59}
60
61void *
62get_return_addr(struct process *proc, void *stack_pointer)
63{
64	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_LNK, 0);
65}
66
67void
68set_return_addr(struct process *proc, void *addr)
69{
70	ptrace(PTRACE_POKEUSER, proc->pid, sizeof(long)*PT_LNK, addr);
71}
72