gcc/testsuite/gcc.target/i386/ms_hook_prologue.c

   1 /* Test that the ms_hook_prologue attribute generates the correct code.  */
   2
   3 /* { dg-do run } */
   4 /* { dg-require-effective-target ms_hook_prologue } */
   5 /* { dg-options "-O2 -fomit-frame-pointer" } */
   6
   7 int __attribute__ ((__ms_hook_prologue__)) foo ()
   8 {
   9   unsigned char *ptr = (unsigned char *) foo;
  10
  11   /* The NOP mov must not be optimized away by optimizations.
  12      The push %ebp, mov %esp, %ebp must not be removed by
  13      -fomit-frame-pointer */
  14 #ifndef __x86_64__
  15   /* movl.s %edi, %edi */
  16   if(*ptr++ != 0x8b) return 1;
  17   if(*ptr++ != 0xff) return 1;
  18   /* push %ebp */
  19   if(*ptr++ != 0x55) return 1;
  20   /* movl.s %esp, %ebp */
  21   if(*ptr++ != 0x8b) return 1;
  22   if(*ptr++ != 0xec) return 1;
  23 #else
  24   /* leaq 0(%rsp), %rsp */
  25   if (*ptr++ != 0x48) return 1;
  26   if (*ptr++ != 0x8d) return 1;
  27   if (*ptr++ != 0xa4) return 1;
  28   if (*ptr++ != 0x24) return 1;
  29   if (ptr[0] != 0 || ptr[1] != 0 || ptr[2] != 0 || ptr[3] != 0)
  30     return 1;
  31 #endif
  32   return 0;
  33 }
  34
  35 int main ()
  36 {
  37   return foo();
  38 }