tree 66e9659f71c8560a00474e174e9c9bd33ed1c3ca
parent 9f88e323c3d0926f52ab3d4a5379eefd92ff28c2
author Hans Wennborg <hans@hanshq.net> 1485534463 +0000
committer Hans Wennborg <hans@hanshq.net> 1485534463 +0000

Merging r292723:
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r292723 | compnerd | 2017-01-21 08:22:59 -0800 (Sat, 21 Jan 2017) | 17 lines

X86: swap EBP, ESP on !APPLE

Restore the `libunwind.h` enumeration values back to the inverted
values.  This diverges from the DWARF definition of the register values.
However, this allows our header to be compatible with other unwind
implementations (e.g. HP, GNU Savannah, GCC).

The register IDs are only swapped in the header and need to be unswapped
when accessing the unwind register file.  The flipped EBP and ESP only
applies on non-Apple x86 targets.

When optimizations were enabled, EBP and ESP would no longer be
equivalent.  As a result, the incorrect access on Linux would manifest
as a failure to unwind the stack.  We can now unwind the stack with and
without FPO on Linux x86.

Resolves PR30879!
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git-svn-id: https://llvm.org/svn/llvm-project/libunwind/branches/release_40@293298 91177308-0d34-0410-b5e6-96231b3b80d8