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aarch64: Add asm helpers for GCS

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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.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
This commit is contained in:
Szabolcs Nagy 2023-02-22 14:35:00 +00:00 committed by Yury Khrustalev
parent 8ef1791950
commit 58771b8a59
1 changed files with 7 additions and 0 deletions
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7
sysdeps/aarch64/sysdep.h
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@ -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