sysdeps/x86_64/stackguard-macros.h

   1 #include <stdint.h>
   2
   3 #define STACK_CHK_GUARD \
   4   ({ uintptr_t x;                                               \
   5      asm ("mov %%fs:%c1, %0" : "=r" (x)                         \
   6           : "i" (offsetof (tcbhead_t, stack_guard))); x; })