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
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2004-2021 Free Software Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include <pthread.h>
static void *p;
static void
handler (int sig, siginfo_t *info, void *context)
{
/* Copy to local vars, as the test wants to read them, and si_addr,
etc. may be preprocessor defines. */
int ssi_errno = info->si_errno;
int ssi_signo = info->si_signo;
int ssi_code = info->si_code;
void *ssi_addr = info->si_addr;
_exit (0); /* set breakpoint here */
}
static void *
segv_thread (void *ptr)
{
*(int *)ptr = 0;
}
int
main (void)
{
pthread_t thr;
/* Set up unwritable memory. */
{
size_t len;
len = sysconf(_SC_PAGESIZE);
p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
if (p == MAP_FAILED)
{
perror ("mmap");
return 1;
}
}
/* Set up the signal handler. */
{
struct sigaction action;
memset (&action, 0, sizeof (action));
action.sa_sigaction = handler;
action.sa_flags |= SA_SIGINFO;
if (sigaction (SIGSEGV, &action, NULL))
{
perror ("sigaction");
return 1;
}
}
/* Create a thread that will trigger SIGSEGV. */
pthread_create (&thr, NULL, segv_thread, p);
pthread_join (thr, NULL);
return 0;
}
|
