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
42 void
get_arch_dep(struct process * proc)43 get_arch_dep(struct process *proc)
44 {
45 }
46
47 /* Returns 1 if syscall, 2 if sysret, 0 otherwise.
48 */
49 int
syscall_p(struct process * proc,int status,int * sysnum)50 syscall_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