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[v9,01/19] aarch64: Add asm helpers for GCS

Message ID 20250117174119.3254972-2-yury.khrustalev@arm.com
State New
Headers show
Series aarch64: Add support for Guarded Control Stack extension | expand

Commit Message

Yury Khrustalev Jan. 17, 2025, 5:41 p.m. UTC 
From: Szabolcs Nagy <szabolcs.nagy@arm.com>

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>
---
 sysdeps/aarch64/sysdep.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h
index 1b317735a4..4df120ad80 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