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.
---
gcc/config/aarch64/aarch64-option-extensions.def | 2 ++
gcc/config/aarch64/aarch64.h | 6 ++++++
gcc/doc/invoke.texi | 2 ++
3 files changed, 10 insertions(+)
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def
b/gcc/config/aarch64/aarch64-option-extensions.def
index da31f7c32d1..e72c039b612 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -155,4 +155,6 @@ AARCH64_OPT_EXTENSION("d128", D128, (), (), (), "d128")
AARCH64_OPT_EXTENSION("the", THE, (), (), (), "the")
+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 1b3c800ec89..69ef54553d7 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -230,6 +230,7 @@ enum class aarch64_feature : unsigned char {
#define AARCH64_ISA_CSSC (aarch64_isa_flags & AARCH64_FL_CSSC)
#define AARCH64_ISA_D128 (aarch64_isa_flags & AARCH64_FL_D128)
#define AARCH64_ISA_THE (aarch64_isa_flags & AARCH64_FL_THE)
+#define AARCH64_ISA_GCS (aarch64_isa_flags & AARCH64_FL_GCS)
/* AARCH64_FL options necessary for system register implementation. */
@@ -403,6 +404,11 @@ enum class aarch64_feature : unsigned char {
enabled through +the. */
#define TARGET_THE (AARCH64_ISA_THE)
+/* 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:
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 88327ce9681..88ee1fdb524 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -21032,6 +21032,8 @@ Enable the Pointer Authentication Extension.
Enable the Common Short Sequence Compression instructions.
@item d128
Enable support for 128-bit system register read/write instructions.
+@item gcs
+Enable support for Armv9.4-a Guarded Control Stack extension.
@item the
Enable support for Armv8.9-a/9.4-a translation hardening extension.
--
2.41.0
