[llvm-branch-commits] [clang] [llvm] Add some brief LLVM 19 release notes for Pointer Authentication ABI support (PR #104657)

[Anton Korobeynikov via llvm-branch-commits]

https://github.com/asl updated https://github.com/llvm/llvm-project/pull/104657

>From 92c76c04d8a3142ee569fcd705df08e566402b1d Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <anton at korobeynikov.info>
Date: Fri, 16 Aug 2024 18:09:53 -0700
Subject: [PATCH] Add some brief LLVM 19 release notes for Pointer
 Authentication ABI support.

---
 clang/docs/ReleaseNotes.rst |  4 ++++
 llvm/docs/ReleaseNotes.rst  | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 5cd398c22c946d..fc9a141c7ec180 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -1207,6 +1207,10 @@ Arm and AArch64 Support
     * Arm Neoverse-N3 (neoverse-n3).
     * Arm Neoverse-V3 (neoverse-v3).
     * Arm Neoverse-V3AE (neoverse-v3ae).
+ - Experimental support has been added for pointer authentication ABI for С/C++.
+ - Pointer authentication ABI could be enabled for AArch64 Linux via
+   ``-mabi=pauthtest` option or via specifying `pauthtest` environment part of
+   target triple.
 
 Android Support
 ^^^^^^^^^^^^^^^
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
index a81caa160883d8..60b6c6e786df89 100644
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -80,6 +80,11 @@ Changes to the LLVM IR
     removed. The next argument has been changed from byte index to bit
     index.
 * Added ``llvm.experimental.vector.compress`` intrinsic.
+* Added special kind of `constant expressions
+  <https://llvm.org/docs/LangRef.html#pointer-authentication-constants>`_ to
+  represent pointers with signature embedded into it.
+* Added `pointer authentication operand bundles
+  <https://llvm.org/docs/LangRef.html#pointer-authentication-operand-bundles>`_. 
 
 Changes to LLVM infrastructure
 ------------------------------
@@ -125,6 +130,15 @@ Changes to the AArch64 Backend
   when specified via ``-march=`` or an ``-mcpu=`` that supports them.  The
   attribute ``"target-features"="+v9a"`` no longer implies ``"+sve"`` and
   ``"+sve2"`` respectively.
+* Added support for ELF pointer authentication relocations as specified in
+  `PAuth ABI Extension to ELF
+  <https://github.com/ARM-software/abi-aa/blob/main/pauthabielf64/pauthabielf64.rst>`_.
+* Added codegeneration, ELF object file and linker support for authenticated
+  call lowering, signed constants and emission of signing scheme details in
+  ``GNU_PROPERTY_AARCH64_FEATURE_PAUTH`` property of ``.note.gnu.property``
+  section.
+* Added codegeneration support for ``llvm.ptrauth.auth`` and
+  ``llvm.ptrauth.resign`` intrinsics.
 
 Changes to the AMDGPU Backend
 -----------------------------