1/*
2 * This file is part of ltrace.
3 * Copyright (C) 1998,2001,2004,2008,2009 Juan Cespedes
4 * Copyright (C) 2009 Juan Cespedes
5 * Copyright (C) 2006 Ian Wienand
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/wait.h>
27#include <signal.h>
28#include <sys/ptrace.h>
29#include <asm/ptrace.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_arch_dep(struct process *proc)
44{
45}
46
47/* Returns 1 if syscall, 2 if sysret, 0 otherwise.
48 */
49int
50syscall_p(struct process *proc, int status, int *sysnum)
51{
52	int depth;
53
54	if (WIFSTOPPED(status)
55	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
56		*sysnum = ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_ORIG_D0, 0);
57		if (*sysnum == -1)
58			return 0;
59		if (*sysnum >= 0) {
60			depth = proc->callstack_depth;
61			if (depth > 0 &&
62					proc->callstack[depth - 1].is_syscall &&
63					proc->callstack[depth - 1].c_un.syscall == *sysnum) {
64				return 2;
65			} else {
66				return 1;
67			}
68		}
69	}
70	return 0;
71}
72