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arm: Add Armv9.3-A GCS (Guarded Control Stack) support

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Signal that our assembly is compliant with the GCS feature, if
the GCS feature is enabled in the compiler (available since Clang
18 and GCC 15) - this is enabled by -mbranch-protection=standard
with a new enough compiler.

GCS doesn't require any specific modifications to the assembly
code, but requires that all functions return to the expected call
address (checked through a shadow stack).
This commit is contained in:
Martin Storsjö
2026-03-17 20:40:05 +00:00
parent 6894b7f2d0
commit 594d1601ff
1 changed files with 9 additions and 3 deletions
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src/arm/asm.S
+9 -3
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@@ -193,8 +193,14 @@ DISABLE_SVE2
#endif /* !__ARM_FEATURE_PAC_DEFAULT */
#if defined(__ARM_FEATURE_GCS_DEFAULT) && __ARM_FEATURE_GCS_DEFAULT == 1
#define GNU_PROPERTY_AARCH64_GCS (1 << 2)
#else
#define GNU_PROPERTY_AARCH64_GCS 0 /* No GCS */
#endif
#if (GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_PAC != 0) && defined(__ELF__)
#if (GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_PAC != 0 || GNU_PROPERTY_AARCH64_GCS != 0) && defined(__ELF__)
.pushsection .note.gnu.property, "a"
.balign 8
.long 4
@@ -203,10 +209,10 @@ DISABLE_SVE2
.asciz "GNU"
.long 0xc0000000 /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
.long 4
.long (GNU_PROPERTY_AARCH64_BTI | GNU_PROPERTY_AARCH64_PAC)
.long (GNU_PROPERTY_AARCH64_BTI | GNU_PROPERTY_AARCH64_PAC | GNU_PROPERTY_AARCH64_GCS)
.long 0
.popsection
#endif /* (GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_PAC != 0) && defined(__ELF__) */
#endif /* (GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_PAC != 0 || GNU_PROPERTY_AARCH64_GCS != 0) && defined(__ELF__) */
#endif /* ARCH_AARCH64 */
#if ARCH_ARM