commit e373721f64c4448273f9f86fe5a2df0f3b339ad8
author Luke Cheeseman <luke.cheeseman@arm.com> Fri Dec 14 11:30:12 2018 +0000
committer Copybara-Service <copybara-worker@google.com> Fri Aug 28 11:09:53 2020 -0700
tree 2ed2a23e64f762c8cbf95a595b401126f4bcfab6
parent 0c45f9b96cc7a609a29c85e442f74ba23c063bb9

[AArch64][libunwind] Unwinding support for return address signing

- Follow up to revision r342895
- gcc would not build libunwind with the earlier patch as the autia1716
  instruction wasn't allowed to be assembled for pre armv8.3a targets
- The autia1716 instruction lives in the hint space encodings so is a valid
  instruction for all armv8a targets
- To work around this I have swapped out the autia1716 instruction for the hint
  instruction

Differential Revision: https://reviews.llvm.org/D55700

llvm-svn: 349140
GitOrigin-RevId: e1a819e82de87bfd217d73ca74a39d10b46d0a71