Commits on Feb 7, 2022

1. [libunwind] [sparc] Add SPARCv9 support …

   Adds libunwind support for SPARCv9 (aka sparc64). This is a rebase of @kettenis' patch D32450, which I created (with his permission) because the original review has become inactive.
   The changes are of a cosmetic nature to make it fit better with the new code style, and to reuse the existing SPARCv8 code, whenever possible.
   
   Please let me know if I posted this on the wrong place. Also, the summary of the original review is reproduced below:
   
   > This adds unwinder support for 64-bit SPARC (aka SPARCv9). The implementation was done on OpenBSD/sparc64, so it takes StackGhost into account:
   >
   > https://www.usenix.org/legacy/publications/library/proceedings/sec01/full_papers/frantzen/frantzen_html/index.html
   >
   > Since StackGhost xor's return addresses with a random cookie before storing them on the stack, the unwinder has to do some extra work to recover those. This is done by introducing a new kRegisterInCFADecrypt "location" type that is used to implement the DW_CFA_GNU_window_save opcode. That implementation is SPARC-specific, but should work for 32-bit SPARC as well. DW_CFA_GNU_window_save is only ever generated on SPARC as far as I know.
   
   Co-authored-by: Mark Kettenis
   Reviewed By: #libunwind, thesamesam, MaskRay, Arfrever
   
   Differential Revision: https://reviews.llvm.org/D116857
   
   (cherry picked from commit 2b9554b)

   

   koachan authored and llvmbot committed Feb 7, 2022
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