bd52d17906
too large to list, but see: http://gcc.gnu.org/gcc-3.4/changes.html http://gcc.gnu.org/gcc-4.0/changes.html http://gcc.gnu.org/gcc-4.1/changes.html for the details.
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* PR middle-end/17813 */
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/* Origin: Tom Hughes <tom@compton.nu> */
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/* { dg-do run { target i?86-*-linux* x86_64-*-linux* } } */
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/* { dg-options "-O -fomit-frame-pointer" } */
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/* { dg-options "-O -fomit-frame-pointer -march=i386" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
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#include <setjmp.h>
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#include <signal.h>
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#include <stdlib.h>
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static jmp_buf segv_jmpbuf;
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static void segv_handler(int seg)
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{
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__builtin_longjmp(segv_jmpbuf, 1);
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}
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static int is_addressable(void *p, size_t size)
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{
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volatile char * volatile cp = (volatile char *)p;
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volatile int ret;
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struct sigaction sa, origsa;
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sigset_t mask;
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sa.sa_handler = segv_handler;
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sa.sa_flags = 0;
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sigfillset(&sa.sa_mask);
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sigaction(SIGSEGV, &sa, &origsa);
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sigprocmask(SIG_SETMASK, NULL, &mask);
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if (__builtin_setjmp(segv_jmpbuf) == 0) {
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while(size--)
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*cp++;
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ret = 1;
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} else
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ret = 0;
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sigaction(SIGSEGV, &origsa, NULL);
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sigprocmask(SIG_SETMASK, &mask, NULL);
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return ret;
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}
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int main(int argc, char **argv)
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{
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is_addressable(0x0, 1);
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return 0;
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}
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