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[libunwind] Be more careful about enabling GCS (#101973)

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We need both GCS to be enabled by the compiler (which we do by checking
if __ARM_FEATURE_GCS_DEFAULT is defined) and for arm_acle.h to define
the GCS intrinsics. Check the latter by checking if _CHKFEAT_GCS is
defined.
This commit is contained in:
John Brawn 2024-08-05 18:54:05 +01:00 committed by GitHub
parent 83d9ed29c1
commit c649194a71
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1 changed files with 5 additions and 1 deletions
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6
libunwind/src/cet_unwind.h
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@ -39,9 +39,13 @@
// need to guard any use of GCS instructions with __chkfeat though, as GCS may
// not be enabled.
#if defined(_LIBUNWIND_TARGET_AARCH64) && defined(__ARM_FEATURE_GCS_DEFAULT)
#define _LIBUNWIND_USE_GCS 1
#include <arm_acle.h>
// We can only use GCS if arm_acle.h defines the GCS intrinsics.
#ifdef _CHKFEAT_GCS
#define _LIBUNWIND_USE_GCS 1
#endif
#define _LIBUNWIND_POP_CET_SSP(x) \
do { \
if (__chkfeat(_CHKFEAT_GCS)) { \