[llvm-branch-commits] [libunwind] release/19.x: [libunwind][AIX] Fix the wrong traceback from signal handler (#101069) (PR #101182)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libunwind

Author: None (llvmbot)

<details>
<summary>Changes</summary>

Backport d90fa61

Requested by: @<!-- -->daltenty

---
Full diff: https://github.com/llvm/llvm-project/pull/101182.diff


2 Files Affected:

- (modified) libunwind/src/UnwindCursor.hpp (+2-1) 
- (modified) libunwind/test/aix_signal_unwind.pass.sh.S (+1-1) 


``````````diff
diff --git a/libunwind/src/UnwindCursor.hpp b/libunwind/src/UnwindCursor.hpp
index 2ec60e4c123d5..758557337899e 100644
--- a/libunwind/src/UnwindCursor.hpp
+++ b/libunwind/src/UnwindCursor.hpp
@@ -2589,7 +2589,8 @@ void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) {
     --pc;
 #endif
 
-#if !(defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) && defined(_WIN32))
+#if !(defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) && defined(_WIN32)) &&            \
+    !defined(_LIBUNWIND_SUPPORT_TBTAB_UNWIND)
   // In case of this is frame of signal handler, the IP saved in the signal
   // handler points to first non-executed instruction, while FDE/CIE expects IP
   // to be after the first non-executed instruction.
diff --git a/libunwind/test/aix_signal_unwind.pass.sh.S b/libunwind/test/aix_signal_unwind.pass.sh.S
index 9ca18e9481f4f..a666577d095b1 100644
--- a/libunwind/test/aix_signal_unwind.pass.sh.S
+++ b/libunwind/test/aix_signal_unwind.pass.sh.S
@@ -10,7 +10,7 @@
 // a correct traceback when the function raising the signal does not save
 // the link register or does not store the stack back chain.
 
-// REQUIRES: target=powerpc{{(64)?}}-ibm-aix
+// REQUIRES: target=powerpc{{(64)?}}-ibm-aix{{.*}}
 
 // Test when the function raising the signal does not save the link register
 // RUN: %{cxx} -x c++ %s -o %t.exe -DCXX_CODE %{flags} %{compile_flags}

``````````

</details>


https://github.com/llvm/llvm-project/pull/101182