tree d04adaf593c8ce21a5c89b210b2c5c57c367ef30
parent d23b8c4c310453d1146e31232724401a640d1a24
author Martin Storsjo <martin@martin.st> 1557989353 +0000
committer Copybara-Service <copybara-worker@google.com> 1598638376 -0700

[PPC64][libunwind] Fix r2 not properly restored

This change makes each unwind step inspect the instruction at the
return address and, if needed, read r2 from its saved location and
modify the context appropriately.

The unwind logic is able to handle both ELFv1 and ELFv2 stacks.

Reported by Bug 41050

Patch by Leandro Lupori!

Differential Revision: https://reviews.llvm.org/D59694

llvm-svn: 360861
GitOrigin-RevId: 44266b9e115ad172b1f6a88d15d4e7579812c0fc