From 15d1674cae644619d521af249b3a4f1c17cdcee9 Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Wed, 22 Feb 2023 14:35:00 +0000 Subject: aarch64: Add asm helpers for GCS The Guarded Control Stack instructions can be present even if the hardware does not support the extension (runtime checked feature), so the asm code should be backward compatible with old assemblers. --- sysdeps/aarch64/sysdep.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h index 464674e89c..661d9fe8c1 100644 --- a/sysdeps/aarch64/sysdep.h +++ b/sysdeps/aarch64/sysdep.h @@ -74,6 +74,13 @@ strip_pac (void *p) #define PACIASP hint 25 #define AUTIASP hint 29 +/* Guarded Control Stack support. */ +#define CHKFEAT_X16 hint 40 +#define MRS_GCSPR(x) mrs x, s3_3_c2_c5_1 +#define GCSPOPM(x) sysl x, #3, c7, c7, #1 +#define GCSSS1(x) sys #3, c7, c7, #2, x +#define GCSSS2(x) sysl x, #3, c7, c7, #3 + /* GNU_PROPERTY_AARCH64_* macros from elf.h for use in asm code. */ #define FEATURE_1_AND 0xc0000000 #define FEATURE_1_BTI 1 -- cgit 1.4.1