dilim/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2026-08-09 01:21:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

aarch64: Add Armv9.3-A GCS (Guarded Control Stack) support

Browse Source 
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
2026-03-12 14:52:29 +02:00
parent 1f7ed8a78d
commit 846746be4b
1 changed files with 8 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
libavutil/aarch64/asm.S
View File

@@ -255,8 +255,14 @@ DISABLE_SME2
# define AARCH64_VALIDATE_LINK_REGISTER
#endif
#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
@@ -265,7 +271,7 @@ DISABLE_SME2
.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