[v2,1/5] aarch64: Add march flags for +the and +d128 arch extensions

Message ID 20231128155609.198744-2-victor.donascimento@arm.com
State New
Series aarch64: Add Armv9.4-a 128-bit system-register read/write support |


Context Check Description
linaro-tcwg-bot/tcwg_gcc_build--master-aarch64 fail Patch failed to apply

Commit Message

Victor Do Nascimento Nov. 28, 2023, 3:55 p.m. UTC
  Given the introduction of optional 128-bit page table descriptor and
translation hardening extension support with the Arm9.4-a
architecture, this introduces the relevant flags to enable the reading
and writing of 128-bit system registers.

The `+d128' -march modifier enables the use of the following ACLE
builtin functions:

  * __uint128_t __arm_rsr128(const char *special_register);
  * void __arm_wsr128(const char *special_register, __uint128_t value);

and defines the __ARM_FEATURE_SYSREG128 macro to 1.

Finally, the `rcwmask_el1' and `rcwsmask_el1' 128-bit system register
implementations are also reliant on the enablement of the `+the' flag,
which is thus also implemented in this patch.


	* config/aarch64/aarch64-arches.def (armv8.9-a): New.
	(armv9.4-a): Likewise.
	* config/aarch64/aarch64-option-extensions.def (d128): Likewise.
	(the): Likewise.
	* config/aarch64/aarch64.h (AARCH64_ISA_V9_4A): Likewise.
	(AARCH64_ISA_V8_9A): Likewise.
	(TARGET_ARMV9_4): Likewise.
	(AARCH64_ISA_D128): Likewise.
	(AARCH64_ISA_THE): Likewise.
	(TARGET_D128): Likewise.
	* doc/invoke.texi (AArch64 Options): Document new -march flags
	and extensions.
 gcc/config/aarch64/aarch64-arches.def            |  2 ++
 gcc/config/aarch64/aarch64-c.cc                  |  1 +
 gcc/config/aarch64/aarch64-option-extensions.def |  4 ++++
 gcc/config/aarch64/aarch64.h                     | 15 +++++++++++++++
 gcc/doc/invoke.texi                              |  6 ++++++
 5 files changed, 28 insertions(+)


diff --git a/gcc/config/aarch64/aarch64-arches.def b/gcc/config/aarch64/aarch64-arches.def
index 6b9a19c490b..1fe6b796001 100644
--- a/gcc/config/aarch64/aarch64-arches.def
+++ b/gcc/config/aarch64/aarch64-arches.def
@@ -39,10 +39,12 @@  AARCH64_ARCH("armv8.5-a",     generic_armv8_a,   V8_5A,     8,  (V8_4A, SB, SSBS
 AARCH64_ARCH("armv8.6-a",     generic_armv8_a,   V8_6A,     8,  (V8_5A, I8MM, BF16))
 AARCH64_ARCH("armv8.7-a",     generic_armv8_a,   V8_7A,     8,  (V8_6A, LS64))
 AARCH64_ARCH("armv8.8-a",     generic_armv8_a,   V8_8A,     8,  (V8_7A, MOPS))
+AARCH64_ARCH("armv8.9-a",     generic_armv8_a,   V8_9A,     8,  (V8_8A))
 AARCH64_ARCH("armv8-r",       generic_armv8_a,   V8R  ,     8,  (V8_4A))
 AARCH64_ARCH("armv9-a",       generic_armv9_a,   V9A  ,     9,  (V8_5A, SVE2))
 AARCH64_ARCH("armv9.1-a",     generic_armv9_a,   V9_1A,     9,  (V8_6A, V9A))
 AARCH64_ARCH("armv9.2-a",     generic_armv9_a,   V9_2A,     9,  (V8_7A, V9_1A))
 AARCH64_ARCH("armv9.3-a",     generic_armv9_a,   V9_3A,     9,  (V8_8A, V9_2A))
+AARCH64_ARCH("armv9.4-a",     generic_armv9_a,   V9_4A,     9,  (V8_9A, V9_3A))
 #undef AARCH64_ARCH
diff --git a/gcc/config/aarch64/aarch64-c.cc b/gcc/config/aarch64/aarch64-c.cc
index be8b7236cf9..cacf8e8ed25 100644
--- a/gcc/config/aarch64/aarch64-c.cc
+++ b/gcc/config/aarch64/aarch64-c.cc
@@ -206,6 +206,7 @@  aarch64_update_cpp_builtins (cpp_reader *pfile)
   aarch64_def_or_undef (TARGET_LS64,
 			"__ARM_FEATURE_LS64", pfile);
   aarch64_def_or_undef (AARCH64_ISA_RCPC, "__ARM_FEATURE_RCPC", pfile);
+  aarch64_def_or_undef (TARGET_D128, "__ARM_FEATURE_SYSREG128", pfile);
   /* Not for ACLE, but required to keep "float.h" correct if we switch
      target between implementations that do or do not support ARMv8.2-A
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index 825f3bf7758..da31f7c32d1 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -151,4 +151,8 @@  AARCH64_OPT_EXTENSION("mops", MOPS, (), (), (), "")
 AARCH64_OPT_EXTENSION("cssc", CSSC, (), (), (), "cssc")
+AARCH64_OPT_EXTENSION("d128", D128, (), (), (), "d128")
+AARCH64_OPT_EXTENSION("the", THE, (), (), (), "the")
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index efe2036537e..5f0486cb128 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -219,13 +219,17 @@  enum class aarch64_feature : unsigned char {
 #define AARCH64_ISA_PAUTH	   (aarch64_isa_flags & AARCH64_FL_PAUTH)
 #define AARCH64_ISA_V8_7A	   (aarch64_isa_flags & AARCH64_FL_V8_7A)
 #define AARCH64_ISA_V8_8A	   (aarch64_isa_flags & AARCH64_FL_V8_8A)
+#define AARCH64_ISA_V8_9A	   (aarch64_isa_flags & AARCH64_FL_V8_9A)
 #define AARCH64_ISA_V9A		   (aarch64_isa_flags & AARCH64_FL_V9A)
 #define AARCH64_ISA_V9_1A          (aarch64_isa_flags & AARCH64_FL_V9_1A)
 #define AARCH64_ISA_V9_2A          (aarch64_isa_flags & AARCH64_FL_V9_2A)
 #define AARCH64_ISA_V9_3A          (aarch64_isa_flags & AARCH64_FL_V9_3A)
+#define AARCH64_ISA_V9_4A          (aarch64_isa_flags & AARCH64_FL_V9_4A)
 #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_D128	   (aarch64_isa_flags & AARCH64_FL_D128)
+#define AARCH64_ISA_THE		   (aarch64_isa_flags & AARCH64_FL_THE)
 /* AARCH64_FL options necessary for system register implementation.  */
@@ -388,6 +392,17 @@  enum class aarch64_feature : unsigned char {
 /* ARMv8.1-A Adv.SIMD support.  */
+/* Armv9.4-A features.  */
+#define TARGET_ARMV9_4 (AARCH64_ISA_V9_4A)
+/*  128-bit System Registers and Instructions from Armv9.4-a are enabled
+    through +d128.  */
+#define TARGET_D128 (AARCH64_ISA_D128)
+/*  Armv8.9-A/9.4-A Translation Hardening Extension system registers are
+    enabled through +the.  */
 /* Standard register usage.  */
 /* 31 64-bit general purpose registers R0-R30:
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 7666de1e9b2..c76205bf6e8 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -20801,10 +20801,12 @@  and the features that they enable by default:
 @item @samp{armv8.6-a} @tab Armv8.6-A @tab @samp{armv8.5-a}, @samp{+bf16}, @samp{+i8mm}
 @item @samp{armv8.7-a} @tab Armv8.7-A @tab @samp{armv8.6-a}, @samp{+ls64}
 @item @samp{armv8.8-a} @tab Armv8.8-a @tab @samp{armv8.7-a}, @samp{+mops}
+@item @samp{armv8.9-a} @tab Armv8.9-a @tab @samp{armv8.8-a}
 @item @samp{armv9-a} @tab Armv9-A @tab @samp{armv8.5-a}, @samp{+sve}, @samp{+sve2}
 @item @samp{armv9.1-a} @tab Armv9.1-A @tab @samp{armv9-a}, @samp{+bf16}, @samp{+i8mm}
 @item @samp{armv9.2-a} @tab Armv9.2-A @tab @samp{armv9.1-a}, @samp{+ls64}
 @item @samp{armv9.3-a} @tab Armv9.3-A @tab @samp{armv9.2-a}, @samp{+mops}
+@item @samp{armv9.4-a} @tab Armv9.4-A @tab @samp{armv9.3-a}
 @item @samp{armv8-r} @tab Armv8-R @tab @samp{armv8-r}
 @end multitable
@@ -21107,6 +21109,10 @@  Enable the Flag Manipulation instructions Extension.
 Enable the Pointer Authentication Extension.
 @item cssc
 Enable the Common Short Sequence Compression instructions.
+@item d128
+Enable support for 128-bit system register read/write instructions.
+@item the
+Enable support for Armv8.9-a/9.4-a translation hardening extension.
 @end table