tree d04adaf593c8ce21a5c89b210b2c5c57c367ef30
parent 74034c7190e9971bf1547ccbe06a4f681ee20fda
author Martin Storsjo <martin@martin.st> 1557989353 +0000
committer Martin Storsjo <martin@martin.st> 1557989353 +0000

[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

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@360861 91177308-0d34-0410-b5e6-96231b3b80d8