Blame sysdeps/s390/s390-64/stackguard-macros.h

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#include <stdint.h>
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#define STACK_CHK_GUARD \
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  ({ uintptr_t x; __asm__ ("ear %0,%%a0; sllg %0,%0,32; ear %0,%%a1; lg %0,0x28(%0)" : "=a" (x)); x; })
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/* On s390/s390x there is no unique pointer guard, instead we use the
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   same value as the stack guard.  */
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#define POINTER_CHK_GUARD					\
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  ({								\
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    uintptr_t x;						\
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    __asm__ ("ear %0,%%a0;"					\
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	     "sllg %0,%0,32;"					\
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	     "ear %0,%%a1;"					\
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	     "lg %0,%1(%0)"					\
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	     : "=a" (x)						\
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	     : "i" (offsetof (tcbhead_t, stack_guard)));	\
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    x;								\
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  })