1/* PR middle-end/17813 */
2/* Origin: Tom Hughes <tom@compton.nu> */
3/* { dg-do run { target i?86-*-linux* x86_64-*-linux* } } */
4/* { dg-options "-O -fomit-frame-pointer" } */
5/* { dg-options "-O -fomit-frame-pointer -march=i386" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
6
7#include <setjmp.h>
8#include <signal.h>
9#include <stdlib.h>
10
11static jmp_buf segv_jmpbuf;
12
13static void segv_handler(int seg)
14{
15   __builtin_longjmp(segv_jmpbuf, 1);
16}
17
18static int is_addressable(void *p, size_t size)
19{
20   volatile char * volatile cp = (volatile char *)p;
21   volatile int ret;
22   struct sigaction sa, origsa;
23   sigset_t mask;
24
25   sa.sa_handler = segv_handler;
26   sa.sa_flags = 0;
27   sigfillset(&sa.sa_mask);
28   sigaction(SIGSEGV, &sa, &origsa);
29   sigprocmask(SIG_SETMASK, NULL, &mask);
30
31   if (__builtin_setjmp(segv_jmpbuf) == 0) {
32      while(size--)
33	 *cp++;
34      ret = 1;
35    } else
36      ret = 0;
37
38   sigaction(SIGSEGV, &origsa, NULL);
39   sigprocmask(SIG_SETMASK, &mask, NULL);
40
41   return ret;
42}
43
44int main(int argc, char **argv)
45{
46   is_addressable(0x0, 1);
47   return 0;
48}
49