tree 00586b75ec8dc965f9f81d1792cee79ac693795a
parent ecc449e514ed6efaeb404ff1c59b61d4f8b8fc26
author Hans Wennborg <hans@hanshq.net> 1537966665 +0000
committer Hans Wennborg <hans@hanshq.net> 1537966665 +0000

Revert r343089 "[AArch64] - Return address signing dwarf support"

This caused the DebugInfo/Sparc/gnu-window-save.ll test to fail.

> Functions that have signed return addresses need additional dwarf support:
> - After signing the LR, and before authenticating it, the LR register is in a
>   state the is unusable by a debugger or unwinder
> - To account for this a new directive, .cfi_negate_ra_state, is added
> - This directive says the signed state of the LR register has now changed,
>   i.e. unsigned -> signed or signed -> unsigned
> - This directive has the same CFA code as the SPARC directive GNU_window_save
>   (0x2d), adding a macro to account for multiply defined codes
> - This patch matches the gcc implementation of this support:
>   https://patchwork.ozlabs.org/patch/800271/
>
> Differential Revision: https://reviews.llvm.org/D50136

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@343103 91177308-0d34-0410-b5e6-96231b3b80d8