[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
NOKEYCHECK=True
GitOrigin-RevId: 2b9554b8850192bdd86c02eb671de1d866df8d87
diff --git a/src/libunwind.cpp b/src/libunwind.cpp
index ef48cbe..03f8b75 100644
--- a/src/libunwind.cpp
+++ b/src/libunwind.cpp
@@ -67,6 +67,8 @@
# define REGISTER_KIND Registers_mips_newabi
#elif defined(__mips__)
# warning The MIPS architecture is not supported with this ABI and environment!
+#elif defined(__sparc__) && defined(__arch64__)
+#define REGISTER_KIND Registers_sparc64
#elif defined(__sparc__)
# define REGISTER_KIND Registers_sparc
#elif defined(__riscv)