Implement a CPP macro that can be called from .S files to emit the .note
section carrying the annotation that informs the linker that the object
file is compatible with BTI control flow integrity checks.
Signed-off-by: Ard Biesheuvel <a...@kernel.org>
---
MdePkg/Include/AArch64/ProcessorBind.h | 31 ++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/MdePkg/Include/AArch64/ProcessorBind.h
b/MdePkg/Include/AArch64/ProcessorBind.h
index abe2571245c665f3..11814f1ffaef698a 100644
--- a/MdePkg/Include/AArch64/ProcessorBind.h
+++ b/MdePkg/Include/AArch64/ProcessorBind.h
@@ -186,6 +186,37 @@ typedef INT64 INTN;
#define GCC_ASM_IMPORT(func__) \
.extern _CONCATENATE (__USER_LABEL_PREFIX__, func__)
+#if defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1
+#define AARCH64_BTI(__type) \
+ .ifnc __type, ;\
+ bti __type ;\
+ .endif ;\
+ .ifndef .Lgnu_bti_notesize ;\
+ .pushsection .note.gnu.property, "a" ;\
+ .set NT_GNU_PROPERTY_TYPE_0, 0x5 ;\
+ .set GNU_PROPERTY_AARCH64_FEATURE_1_AND, 0xc0000000 ;\
+ .set GNU_PROPERTY_AARCH64_FEATURE_1_BTI, 0x1 ;\
+ .align 3 ;\
+ .long .Lnamesize ;\
+ .long .Lgnu_bti_notesize ;\
+ .long NT_GNU_PROPERTY_TYPE_0 ;\
+0: .asciz "GNU" ;\
+ .set .Lnamesize, . - 0b ;\
+ .align 3 ;\
+1: .long GNU_PROPERTY_AARCH64_FEATURE_1_AND ;\
+ .long .Lvalsize ;\
+2: .long GNU_PROPERTY_AARCH64_FEATURE_1_BTI ;\
+ .set .Lvalsize, . - 2b ;\
+ .align 3 ;\
+ .set .Lgnu_bti_notesize, . - 1b ;\
+ .popsection ;\
+ .endif
+#endif
+
+#endif
+
+#ifndef AARCH64_BTI
+#define AARCH64_BTI(__type)
#endif
/**
--
2.39.2
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