File: stackguard-macros.h

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glibc 2.19-13
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#include <stdint.h>

#define STACK_CHK_GUARD \
  ({ uintptr_t x; asm ("lwz %0,-28680(2)" : "=r" (x)); x; })

#define POINTER_CHK_GUARD \
  ({												\
     uintptr_t x;										\
     asm ("lwz %0,%1(2)"									\
	  : "=r" (x)										\
	  : "i" (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t))	\
         );											\
     x;												\
   })