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1 /* PR middle-end/17813 */
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2 /* Origin: Tom Hughes <tom@compton.nu> */
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3 /* { dg-do run { target i?86-*-linux* i?86-*-gnu* x86_64-*-linux* } } */
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4 /* { dg-options "-O -fomit-frame-pointer" } */
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5 /* { dg-options "-O -fomit-frame-pointer -march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
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6
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7 #include <setjmp.h>
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8 #include <signal.h>
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9 #include <stdlib.h>
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10
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11 static jmp_buf segv_jmpbuf;
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12
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13 static void segv_handler(int seg)
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14 {
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15 __builtin_longjmp(segv_jmpbuf, 1);
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16 }
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17
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18 static int is_addressable(void *p, size_t size)
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19 {
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20 volatile char * volatile cp = (volatile char *)p;
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21 volatile int ret;
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22 struct sigaction sa, origsa;
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23 sigset_t mask;
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24
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25 sa.sa_handler = segv_handler;
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26 sa.sa_flags = 0;
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27 sigfillset(&sa.sa_mask);
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28 sigaction(SIGSEGV, &sa, &origsa);
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29 sigprocmask(SIG_SETMASK, NULL, &mask);
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30
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31 if (__builtin_setjmp(segv_jmpbuf) == 0) {
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32 while(size--)
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33 *cp++;
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34 ret = 1;
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35 } else
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36 ret = 0;
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37
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38 sigaction(SIGSEGV, &origsa, NULL);
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39 sigprocmask(SIG_SETMASK, &mask, NULL);
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40
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41 return ret;
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42 }
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43
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44 int main(int argc, char **argv)
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45 {
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46 is_addressable(0x0, 1);
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47 return 0;
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48 }
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