#include <stdint.h>

#define STACK_CHK_GUARD \

  ({ uintptr_t x; asm ("movl %%gs:0x14, %0" : "=r" (x)); x; })

#define POINTER_CHK_GUARD \

  ({							\

     uintptr_t x;					\

     asm ("movl %%gs:%c1, %0" : "=r" (x)		\

	  : "i" (offsetof (tcbhead_t, pointer_guard)));	\

     x;							\

   })