File: stackguard-macros.h

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glibc 2.23-4
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#include <stdint.h>

#define STACK_CHK_GUARD \
  ({ uintptr_t x; asm ("adds %0 = -8, r13;; ld8 %0 = [%0]" : "=r" (x)); x; })

#define POINTER_CHK_GUARD \
  ({ uintptr_t x; asm ("adds %0 = -16, r13;; ld8 %0 = [%0]" : "=r" (x)); x; })