tree 90d9e65b4f058d0f19ab45ab843042375532e4a9
parent 84d6eaf5fb952c695f6934b94cbcdec7cadc2739
author Ties Stuij <ties.stuij@arm.com> 1639128979 +0000
committer Copybara-Service <copybara-worker@google.com> 1639130147 -0800

[ARM][libcxxabi] Add PACBTI-M support to libcxxabi

This change consists of just adding 'BTI' to the prologue of Arm assembly
functions, which is just the one: __cxa_end_cleanup

This patch is part of a series that adds support for the PACBTI-M extension of
the Armv8.1-M architecture, as detailed here:

https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/armv8-1-m-pointer-authentication-and-branch-target-identification-extension

The PACBTI-M specification can be found in the Armv8-M Architecture Reference
Manual:

https://developer.arm.com/documentation/ddi0553/latest

The following people contributed to this patch:

- Mikhail Maltsev

Reviewed By: lenary, danielkiss

Differential Revision: https://reviews.llvm.org/D112432

GitOrigin-RevId: 69faae2376c1a5beccdfbf103346354c68f3570c