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* [gcc(refs/vendors/ARM/heads/gcs-13)] aarch64: Add support for GCS system registers with the +gcs modifier
@ 2024-02-14 15:36 Szabolcs Nagy
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From: Szabolcs Nagy @ 2024-02-14 15:36 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:6ce354816bcb27658973e0081ebb5e6dd967a79f
commit 6ce354816bcb27658973e0081ebb5e6dd967a79f
Author: Victor Do Nascimento <victor.donascimento@arm.com>
Date: Fri Nov 3 16:44:56 2023 +0000
aarch64: Add support for GCS system registers with the +gcs modifier
Given the introduction of system registers associated with the Guarded
Control Stack extension to Armv9.4-a in Binutils and their reliance on
the `+gcs' modifier, we implement the necessary changes in GCC to
allow for them to be recognized by the compiler.
gcc/ChangeLog:
* config/aarch64/aarch64-option-extensions.def (gcs): New.
* config/aarch64/aarch64.h (AARCH64_ISA_GCS): New.
(TARGET_THE): Likewise.
* doc/invoke.texi (AArch64 Options): Describe GCS.
(cherry picked from commit 3aba045882d1f589d36eaedd947a014ac6eb5ec3)
Modified when merged.
Diff:
---
gcc/config/aarch64/aarch64-option-extensions.def | 2 ++
gcc/config/aarch64/aarch64.h | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index 825f3bf77589..2749bab3005d 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -151,4 +151,6 @@ AARCH64_OPT_EXTENSION("mops", MOPS, (), (), (), "")
AARCH64_OPT_EXTENSION("cssc", CSSC, (), (), (), "cssc")
+AARCH64_OPT_EXTENSION("gcs", GCS, (), (), (), "gcs")
+
#undef AARCH64_OPT_EXTENSION
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index bd2650191dea..cece9cd2651f 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -223,6 +223,7 @@ enum class aarch64_feature : unsigned char {
#define AARCH64_ISA_MOPS (aarch64_isa_flags & AARCH64_FL_MOPS)
#define AARCH64_ISA_LS64 (aarch64_isa_flags & AARCH64_FL_LS64)
#define AARCH64_ISA_CSSC (aarch64_isa_flags & AARCH64_FL_CSSC)
+#define AARCH64_ISA_GCS (aarch64_isa_flags & AARCH64_FL_GCS)
/* Crypto is an optional extension to AdvSIMD. */
#define TARGET_CRYPTO (AARCH64_ISA_CRYPTO)
@@ -370,6 +371,10 @@ enum class aarch64_feature : unsigned char {
/* Armv9.4-A features. */
#define TARGET_ARMV9_4 (AARCH64_ISA_V9_4A)
+/* Armv9.4-A Guarded Control Stack extension system registers are
+ enabled through +gcs. */
+#define TARGET_GCS (AARCH64_ISA_GCS)
+
/* Standard register usage. */
/* 31 64-bit general purpose registers R0-R30:
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