1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*
* This file is part of ltrace.
* Copyright (C) 2004,2008,2009 Juan Cespedes
* Copyright (C) 2006 Ian Wienand
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "config.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <sys/ptrace.h>
#include <asm/ptrace.h>
#include "proc.h"
#include "common.h"
#include "debug.h"
#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
# define PTRACE_PEEKUSER PTRACE_PEEKUSR
#endif
#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
# define PTRACE_POKEUSER PTRACE_POKEUSR
#endif
void
get_arch_dep(Process *proc) {
}
/* Returns 1 if syscall, 2 if sysret, 0 otherwise.
*/
int
syscall_p(Process *proc, int status, int *sysnum) {
if (WIFSTOPPED(status)
&& WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
char *ip = get_instruction_pointer(proc) - 4;
long x = ptrace(PTRACE_PEEKTEXT, proc->pid, ip, 0);
debug(2, "instr: %016lx", x);
if ((x & 0xffffffff) != 0x00000083)
return 0;
*sysnum =
ptrace(PTRACE_PEEKUSER, proc->pid, 0 /* REG_R0 */ , 0);
if (proc->callstack_depth > 0 &&
proc->callstack[proc->callstack_depth - 1].is_syscall &&
proc->callstack[proc->callstack_depth - 1].c_un.syscall == *sysnum) {
return 2;
}
if (*sysnum >= 0 && *sysnum < 500) {
return 1;
}
}
return 0;
}
long
gimme_arg(enum tof type, Process *proc, int arg_num, struct arg_type_info *info)
{
if (arg_num == -1) { /* return value */
return ptrace(PTRACE_PEEKUSER, proc->pid, 0 /* REG_R0 */ , 0);
}
if (type == LT_TOF_FUNCTION || type == LT_TOF_FUNCTIONR) {
if (arg_num <= 5)
return ptrace(PTRACE_PEEKUSER, proc->pid,
arg_num + 16 /* REG_A0 */ , 0);
else
return ptrace(PTRACE_PEEKTEXT, proc->pid,
proc->stack_pointer + 8 * (arg_num - 6),
0);
} else if (type == LT_TOF_SYSCALL || type == LT_TOF_SYSCALLR) {
return ptrace(PTRACE_PEEKUSER, proc->pid,
arg_num + 16 /* REG_A0 */ , 0);
} else {
fprintf(stderr, "gimme_arg called with wrong arguments\n");
exit(1);
}
return 0;
}
|
