[PATCH] libsanitizer: Fix SPARC stacktraces

[Rainer Orth]

As detailed in LLVM Issue #57624
(https://github.com/llvm/llvm-project/issues/57624), a patch to
sanitizer_internal_defs.h broke SPARC stacktraces in the sanitizers.
The issue has now been fixed upstream (https://reviews.llvm.org/D156504)
and I'd like to cherry-pick that patch.

Bootstrapped without regressions on sparc-sun-solaris2.11.

Ok for trunk and the gcc-13 branch?

        Rainer

-- 
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University


2023-07-27  Rainer Orth  <r...@cebitec.uni-bielefeld.de>

        libsanitizer:
        * sanitizer_common/sanitizer_stacktrace_sparc.cpp,
        sanitizer_common/sanitizer_unwind_linux_libcdep.cpp: Cherry-pick
        llvm-project revision 679c076ae446af81eba81ce9b94203a273d4b88a.


# HG changeset patch
# Parent  cc61fd6b33c37b7a2a1415e0ed02f75dd8a21110
Fix SPARC stacktraces in sanitizers

diff --git a/libsanitizer/sanitizer_common/sanitizer_stacktrace_sparc.cpp b/libsanitizer/sanitizer_common/sanitizer_stacktrace_sparc.cpp
--- a/libsanitizer/sanitizer_common/sanitizer_stacktrace_sparc.cpp
+++ b/libsanitizer/sanitizer_common/sanitizer_stacktrace_sparc.cpp
@@ -30,13 +30,7 @@ void BufferedStackTrace::UnwindFast(uptr
   // TODO(yln): add arg sanity check for stack_top/stack_bottom
   CHECK_GE(max_depth, 2);
   const uptr kPageSize = GetPageSizeCached();
-#if defined(__GNUC__)
-  // __builtin_return_address returns the address of the call instruction
-  // on the SPARC and not the return address, so we need to compensate.
-  trace_buffer[0] = GetNextInstructionPc(pc);
-#else
   trace_buffer[0] = pc;
-#endif
   size = 1;
   if (stack_top < 4096) return;  // Sanity check for stack top.
   // Flush register windows to memory
diff --git a/libsanitizer/sanitizer_common/sanitizer_unwind_linux_libcdep.cpp b/libsanitizer/sanitizer_common/sanitizer_unwind_linux_libcdep.cpp
--- a/libsanitizer/sanitizer_common/sanitizer_unwind_linux_libcdep.cpp
+++ b/libsanitizer/sanitizer_common/sanitizer_unwind_linux_libcdep.cpp
@@ -139,13 +139,7 @@ void BufferedStackTrace::UnwindSlow(uptr
   if (to_pop == 0 && size > 1)
     to_pop = 1;
   PopStackFrames(to_pop);
-#if defined(__GNUC__) && defined(__sparc__)
-  // __builtin_return_address returns the address of the call instruction
-  // on the SPARC and not the return address, so we need to compensate.
-  trace_buffer[0] = GetNextInstructionPc(pc);
-#else
   trace_buffer[0] = pc;
-#endif
 }
 
 void BufferedStackTrace::UnwindSlow(uptr pc, void *context, u32 max_depth) {