1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2013 Petr Machata, Red Hat Inc.
4 * Copyright (C) 2002,2008,2009 Juan Cespedes
5 * Copyright (C) 2009 Juan Cespedes
6 * Copyright (C) 2008 Luis Machado, IBM Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 * 02110-1301 USA
22 */
23
24#include "config.h"
25
26#include <sys/types.h>
27#include <sys/ptrace.h>
28#include <asm/ptrace.h>
29#include <errno.h>
30#include <error.h>
31
32#include "proc.h"
33#include "common.h"
34
35#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
36# define PTRACE_PEEKUSER PTRACE_PEEKUSR
37#endif
38
39#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
40# define PTRACE_POKEUSER PTRACE_POKEUSR
41#endif
42
43void *
44get_instruction_pointer(struct process *proc)
45{
46	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_NIP, 0);
47}
48
49void
50set_instruction_pointer(struct process *proc, void *addr)
51{
52	if (ptrace(PTRACE_POKEUSER, proc->pid, sizeof(long)*PT_NIP, addr) != 0)
53		error(0, errno, "set_instruction_pointer");
54}
55
56void *
57get_stack_pointer(struct process *proc)
58{
59	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_R1, 0);
60}
61
62void *
63get_return_addr(struct process *proc, void *stack_pointer)
64{
65	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_LNK, 0);
66}
67