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[OpenMP][AArch64] Fix branch protection in microtasks #102317

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Merged
merged 3 commits into from
Aug 13, 2024
Merged

[OpenMP][AArch64] Fix branch protection in microtasks #102317

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d3d9b1e
[OpenMP][AArch64] Fix branch protection in microtasks
tuliom Aug 7, 2024
756ec89
fixup! [OpenMP][AArch64] Fix branch protection in microtasks
tuliom Aug 9, 2024
b8c4fb5
fixup! [OpenMP][AArch64] Fix branch protection in microtasks
tuliom Aug 12, 2024
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53 changes: 53 additions & 0 deletions openmp/runtime/src/z_Linux_asm.S
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,53 @@ KMP_PREFIX_UNDERSCORE(\proc):
.endm
# endif // KMP_OS_DARWIN

# if KMP_OS_LINUX
// BTI and PAC gnu property note
# define NT_GNU_PROPERTY_TYPE_0 5
# define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000
# define GNU_PROPERTY_AARCH64_FEATURE_1_BTI 1
# define GNU_PROPERTY_AARCH64_FEATURE_1_PAC 2

# define GNU_PROPERTY(type, value) \
.pushsection .note.gnu.property, "a"; \
.p2align 3; \
.word 4; \
.word 16; \
.word NT_GNU_PROPERTY_TYPE_0; \
.asciz "GNU"; \
.word type; \
.word 4; \
.word value; \
.word 0; \
.popsection
# endif

# if defined(__ARM_FEATURE_BTI_DEFAULT)
# define BTI_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_BTI
# else
# define BTI_FLAG 0
# endif
# if __ARM_FEATURE_PAC_DEFAULT & 3
# define PAC_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_PAC
# else
# define PAC_FLAG 0
# endif

# if (BTI_FLAG | PAC_FLAG) != 0
# if PAC_FLAG != 0
# define PACBTI_C hint #25
# define PACBTI_RET hint #29
# else
# define PACBTI_C hint #34
# define PACBTI_RET
# endif
# define GNU_PROPERTY_BTI_PAC \
GNU_PROPERTY(GNU_PROPERTY_AARCH64_FEATURE_1_AND, BTI_FLAG | PAC_FLAG)
# else
# define PACBTI_C
# define PACBTI_RET
# define GNU_PROPERTY_BTI_PAC
# endif
#endif // (KMP_OS_LINUX || KMP_OS_DARWIN || KMP_OS_WINDOWS) && (KMP_ARCH_AARCH64 || KMP_ARCH_AARCH64_32 || KMP_ARCH_ARM)

.macro COMMON name, size, align_power
Expand Down Expand Up @@ -1296,6 +1343,7 @@ __tid = 8
// mark_begin;
.text
PROC __kmp_invoke_microtask
PACBTI_C

stp x29, x30, [sp, #-16]!
# if OMPT_SUPPORT
Expand Down Expand Up @@ -1359,6 +1407,7 @@ KMP_LABEL(kmp_1):
ldp x19, x20, [sp], #16
# endif
ldp x29, x30, [sp], #16
PACBTI_RET
ret

DEBUG_INFO __kmp_invoke_microtask
Expand Down Expand Up @@ -2452,3 +2501,7 @@ KMP_PREFIX_UNDERSCORE(__kmp_unnamed_critical_addr):
.section .note.GNU-stack,"",@progbits
# endif
#endif

#if KMP_OS_LINUX && (KMP_ARCH_AARCH64 || KMP_ARCH_AARCH64_32)
GNU_PROPERTY_BTI_PAC
#endif
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