none/tests/x86/badseg.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <signal.h>
   4
   5 static void handler(int sig, siginfo_t *info, void *v)
   6 {
   7         printf("info: sig=%d code=%d addr=0x%lx\n",
   8                info->si_signo, info->si_code, (unsigned long)info->si_addr);
   9         exit(0);
  10 }
  11
  12 int main()
  13 {
  14         struct sigaction sa;
  15         int val;
  16
  17         sa.sa_sigaction = handler;
  18         sigfillset(&sa.sa_mask);
  19         sa.sa_flags = SA_SIGINFO;
  20
  21         sigaction(SIGSEGV, &sa, NULL);
  22
  23         asm volatile("mov %1, %%fs; mov %%fs:0, %0" : "=r" (val) : "r"(4));
  24
  25         printf("val=%d\n", val);
  26
  27         return 0;
  28 }