tree 05ee7c71ade258057f509ecc34386fe9b214eb8c
parent aaea5e4f4bd8f1662ada83622310f7324301ce82
author Daniel Kiss <daniel.kiss@arm.com> 1652425927 +0200
committer Copybara-Service <copybara-worker@google.com> 1652889977 -0700

[libunwind][AArch64] Add support for DWARF expression for RA_SIGN_STATE.

Program may set the RA_SIGN_STATE pseudo register by expressions.
Libunwind expected only the DW_CFA_AARCH64_negate_ra_state could change the value
of the register which leads to runtime errors on PAC enabled systems.
In the recent version of the aadwarf64[1] a limitation is added[2] to forbid the mixing the
DW_CFA_AARCH64_negate_ra_state with other DWARF Register Rule Instructions.

[1] https://github.com/ARM-software/abi-aa/releases/tag/2022Q1
[2] https://github.com/ARM-software/abi-aa/pull/129

Reviewed By: #libunwind, MaskRay

Differential Revision: https://reviews.llvm.org/D123692
Reland: test moved because it depends on exceptions.
GitOrigin-RevId: c218fd3d7d3764eb123c8429bbcd33bacfe2e633