[PATCH v3] aarch64: Add support for GCS in AArch64 linker.

[Srinath Parvathaneni]

Hi,

Changes from v2 - > v3:

v1: https://sourceware.org/pipermail/binutils/2024-January/131564.html
v2: https://sourceware.org/pipermail/binutils/2024-January/132234.html

v1 of this patch is reviewed by  Nick Clifton and provided few review comments.
I have addressed those comments in v2 and committed the patch to vendor branch:
"origin/users/ARM/gcs-binutils-gdb-master"

v3 is the re-based patch of v2 (with no code changes, cherry-pick cleanly applies).

Is this patch ok for binuitls master?

Regards,
Srinath.

---
This patch adds support for GCS in AArch64 linker.

This patch implements the following:
1) Defines GNU_PROPERTY_AARCH64_FEATURE_1_GCS bit for GCS in
GNU_PROPERTY_AARCH64_FEATURE_1_AND macro.

2) Adds readelf support to read and print the GNU properties
in AArch64.

Displaying notes found in: .note.gnu.property
[      ]+Owner[        ]+Data size[    ]+Description
  GNU                  0x00000010      NT_GNU_PROPERTY_TYPE_0
      Properties: AArch64 feature: GCS

3) Adds support for -z experimental-gcs linker option and document
all the values allowed with option (-z experimental-gcs[=always|never|implicit]).
-z experimental-gcs is equivalent to -z experimental-gcs=always and
when option is not passed in the command line, it defaults to implicit.

4) Adds support for -z experimental-gcs-report linker option and document
all the values allowed with this option (-z experimental-gcs-report[=none|warning|error]).
-z experimental-gcs-report is equivalent to -z experimental-gcs-report=none
and when option is not passed in the command line, it defaults to none.

The ABI changes adding GNU_PROPERTY_AARCH64_FEATURE_1_GCS to the
GNU property GNU_PROPERTY_AARCH64_FEATURE_1_AND is merged into main and
can be found below.
https://github.com/ARM-software/abi-aa/blob/main/sysvabi64/sysvabi64.rst

---
 bfd/elfnn-aarch64.c                         | 87 +++++++++++++++++----
 bfd/elfxx-aarch64.c                         | 37 ++++++++-
 bfd/elfxx-aarch64.h                         | 36 +++++++--
 binutils/readelf.c                          |  4 +
 include/elf/common.h                        |  1 +
 ld/emultempl/aarch64elf.em                  | 45 ++++++++++-
 ld/testsuite/ld-aarch64/aarch64-elf.exp     | 23 ++++++
 ld/testsuite/ld-aarch64/property-bti-pac1.d |  2 +-
 ld/testsuite/ld-aarch64/property-bti-pac1.s | 14 ++++
 ld/testsuite/ld-aarch64/property-gcs.s      | 25 ++++++
 ld/testsuite/ld-aarch64/property-gcs1.d     |  6 ++
 ld/testsuite/ld-aarch64/property-gcs10.d    |  6 ++
 ld/testsuite/ld-aarch64/property-gcs11.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs12.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs13.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs14.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs15.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs16.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs17.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs18.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs19.d    |  6 ++
 ld/testsuite/ld-aarch64/property-gcs2.d     | 11 +++
 ld/testsuite/ld-aarch64/property-gcs2.s     | 33 ++++++++
 ld/testsuite/ld-aarch64/property-gcs20.d    |  6 ++
 ld/testsuite/ld-aarch64/property-gcs21.d    |  6 ++
 ld/testsuite/ld-aarch64/property-gcs22.d    | 11 +++
 ld/testsuite/ld-aarch64/property-gcs3.d     | 11 +++
 ld/testsuite/ld-aarch64/property-gcs4.d     | 11 +++
 ld/testsuite/ld-aarch64/property-gcs5.d     | 11 +++
 ld/testsuite/ld-aarch64/property-gcs6.d     | 12 +++
 ld/testsuite/ld-aarch64/property-gcs7.d     |  6 ++
 ld/testsuite/ld-aarch64/property-gcs8.d     | 11 +++
 ld/testsuite/ld-aarch64/property-gcs9.d     | 12 +++
 33 files changed, 495 insertions(+), 26 deletions(-)
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs.s
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs1.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs10.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs11.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs12.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs13.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs14.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs15.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs16.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs17.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs18.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs19.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs2.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs2.s
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs20.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs21.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs22.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs3.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs4.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs5.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs6.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs7.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs8.d
 create mode 100644 ld/testsuite/ld-aarch64/property-gcs9.d

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