Viewing file:  setjmp-2.c (1.07 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* PR middle-end/17813 */
/* Origin: Tom Hughes <tom@compton.nu> */
/* { dg-do run { target i?86-*-linux* i?86-*-gnu* x86_64-*-linux* } } */
/* { dg-options "-O -fomit-frame-pointer" } */
/* { dg-options "-O -fomit-frame-pointer -march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
#include <setjmp.h>
#include <signal.h>
#include <stdlib.h>
static jmp_buf segv_jmpbuf;
static void segv_handler(int seg)
{
__builtin_longjmp(segv_jmpbuf, 1);
}
static int is_addressable(void *p, size_t size)
{
volatile char * volatile cp = (volatile char *)p;
volatile int ret;
struct sigaction sa, origsa;
sigset_t mask;
sa.sa_handler = segv_handler;
sa.sa_flags = 0;
sigfillset(&sa.sa_mask);
sigaction(SIGSEGV, &sa, &origsa);
sigprocmask(SIG_SETMASK, NULL, &mask);
if (__builtin_setjmp(segv_jmpbuf) == 0) {
while(size--)
*cp++;
ret = 1;
} else
ret = 0;
sigaction(SIGSEGV, &origsa, NULL);
sigprocmask(SIG_SETMASK, &mask, NULL);
return ret;
}
int main(int argc, char **argv)
{
is_addressable(0x0, 1);
return 0;
}
|
