regs.c revision 929bd57ca202fd2f2e8485ebf65d683e664f67b5 
1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2004,2008,2009 Juan Cespedes
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#include "config.h"
22
23#include <sys/types.h>
24#include <sys/ptrace.h>
25#include <asm/ptrace.h>
26
27#include "proc.h"
28#include "common.h"
29
30#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
31# define PTRACE_PEEKUSER PTRACE_PEEKUSR
32#endif
33
34#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
35# define PTRACE_POKEUSER PTRACE_POKEUSR
36#endif
37
38void *
39get_instruction_pointer(struct process *proc)
40{
41	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 64 /* REG_PC */ , 0);
42}
43
44void
45set_instruction_pointer(struct process *proc, void *addr)
46{
47	ptrace(PTRACE_POKEUSER, proc->pid, 64 /* REG_PC */ , addr);
48}
49
50void *
51get_stack_pointer(struct process *proc)
52{
53	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 30 /* REG_FP */ , 0);
54}
55
56void *
57get_return_addr(struct process *proc, void *stack_pointer)
58{
59	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 26 /* RA */ , 0);
60}
61
62void
63set_return_addr(struct process *proc, void *addr)
64{
65	ptrace(PTRACE_POKEUSER, proc->pid, 26 /* RA */ , addr);
66}
67