gcc/testsuite/gcc.target/i386/cet-rdssp-1.c

   1 /* { dg-do run { target cet } } */
   2 /* { dg-options "-O2 -fcf-protection -mcet" } */
   3
   4 void _exit(int status) __attribute__ ((__noreturn__));
   5
   6 #ifdef __x86_64__
   7 # define incssp(x) __builtin_ia32_incsspq (x)
   8 # define rdssp() __builtin_ia32_rdsspq ()
   9 #else
  10 # define incssp(x) __builtin_ia32_incsspd (x)
  11 # define rdssp() __builtin_ia32_rdsspd ()
  12 #endif
  13
  14 static void
  15 __attribute__ ((noinline, noclone))
  16 test (unsigned long frames)
  17 {
  18   unsigned long ssp;
  19   ssp = rdssp ();
  20   if (ssp != 0)
  21     {
  22       unsigned long tmp = frames;
  23       while (tmp > 255)
  24         {
  25           incssp (tmp);
  26           tmp -= 255;
  27         }
  28       incssp (tmp);
  29     }
  30   /* We must call _exit since shadow stack is incorrect now.  */
  31   _exit (0);
  32 }
  33
  34 int
  35 main ()
  36 {
  37   test (1);
  38   return 0;
  39 }