[PATCH 0/5] aarch64: Add Armv9.4-a 128-bit system-register read/write support

[Victor Do Nascimento <victor.donascimento@arm.com>]

Given the introduction of optional 128-bit page table descriptor and
translation hardening extension support with the Arm9.4-a
architecture, this patch series introduces the necessary changes to
the aarch64-specific builtin code to enable the reading and writing of
128-bit system registers.  In so doing, the following ACLE builtins and
feature macro are made available to the compiler:

  * __uint128_t __arm_rsr128(const char *special_register);
  * void __arm_wsr128(const char *special_register, __uint128_t value);
  * __ARM_FEATURE_SYSREG128.

Finally, in order to update the GCC system-register database bringing
it in line with Binutils, and in so doing add the relevant 128-bit
system registers to GCC, this patch also introduces the Guarded
Control Stack (GCS) `+gcs' architecture modifier flag, allowing the
inclusion of the novel GCS system registers which are now supported
and also present in the `aarch64-sys-regs.def' system register
database.

Victor Do Nascimento (5):
  aarch64: Add march flags for +the and +d128 arch extensions
  aarch64: Add support for GCS system registers with the +gcs modifier
  aarch64: Sync `aarch64-sys-regs.def' with Binutils.
  aarch64: Implement 128-bit extension to ACLE sysreg r/w builtins
  aarch64: Add rsr128 and wsr128 ACLE tests

 gcc/config/aarch64/aarch64-arches.def         |  2 +
 gcc/config/aarch64/aarch64-builtins.cc        | 50 ++++++++++++++++---
 gcc/config/aarch64/aarch64-c.cc               |  1 +
 .../aarch64/aarch64-option-extensions.def     |  6 +++
 gcc/config/aarch64/aarch64-protos.h           |  2 +-
 gcc/config/aarch64/aarch64-sys-regs.def       | 30 +++++++----
 gcc/config/aarch64/aarch64.cc                 |  6 ++-
 gcc/config/aarch64/aarch64.h                  | 21 ++++++++
 gcc/config/aarch64/aarch64.md                 | 18 +++++++
 gcc/config/aarch64/arm_acle.h                 | 11 ++++
 gcc/doc/invoke.texi                           |  8 +++
 gcc/testsuite/gcc.target/aarch64/acle/rwsr.c  | 30 ++++++++++-
 12 files changed, 165 insertions(+), 20 deletions(-)

-- 
2.41.0