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