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[openmp] Support CET in z_Linux_asm.S (#123213)

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When libomp is built with -cf-protection, add endbr instructions to the
start of functions for Intel CET support.
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Nikita Popov 2025-01-17 09:26:49 +01:00 committed by GitHub
parent c3ba6f378e
commit 90a05f3216
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1 changed files with 12 additions and 0 deletions
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12
openmp/runtime/src/z_Linux_asm.S
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@ -19,6 +19,16 @@
#if KMP_ARCH_X86 || KMP_ARCH_X86_64
# if defined(__ELF__) && defined(__CET__) && defined(__has_include)
# if __has_include(<cet.h>)
# include <cet.h>
# endif
# endif
# if !defined(_CET_ENDBR)
# define _CET_ENDBR
# endif
# if KMP_MIC
// the 'delay r16/r32/r64' should be used instead of the 'pause'.
// The delay operation has the effect of removing the current thread from
@ -66,6 +76,7 @@
ALIGN 4
.globl KMP_PREFIX_UNDERSCORE($0)
KMP_PREFIX_UNDERSCORE($0):
_CET_ENDBR
.endmacro
# else // KMP_OS_DARWIN
# define KMP_PREFIX_UNDERSCORE(x) x //no extra underscore for Linux* OS symbols
@ -92,6 +103,7 @@ KMP_PREFIX_UNDERSCORE($0):
.globl KMP_PREFIX_UNDERSCORE(\proc)
KMP_PREFIX_UNDERSCORE(\proc):
.cfi_startproc
_CET_ENDBR
.endm
.macro KMP_CFI_DEF_OFFSET sz
.cfi_def_cfa_offset \sz