tree 2162c4053cf0a087f8db213a08775a9ad4bf771b
parent 180a937d9a66237e061190e9865383236db5d0c0
author Dimitry Andric <dimitry@andric.com> 1562699683 +0000
committer Dimitry Andric <dimitry@andric.com> 1562699683 +0000

Revert merge of r360861:

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r360861 | mstorsjo | 2019-05-15 23:49:13 -0700 (Wed, 15 May 2019) | 13 lines

[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
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llvm-svn: 365539