[libunwind][AIX] Fix the wrong traceback from signal handler #101069
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@llvm/pr-subscribers-libunwind Author: Xing Xue (xingxue-ibm) ChangesPatch llvm#92291 causes wrong traceback from a signal handler for AIX because the AIX unwinder uses the traceback table at the end of each function instead of FDE/CIE for unwinding. This patch adds a condition to exclude traceback table based unwinding from the code added by the patch. Full diff: https://github.com/llvm/llvm-project/pull/101069.diff 1 Files Affected:
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.
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compnerd
approved these changes
Jul 29, 2024
…e added to exclude traceback based unwinding used for AIX.
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/cherry-pick d90fa61 |
llvmbot
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Jul 30, 2024
…1069) Patch [llvm#92291](llvm#92291) causes wrong traceback from a signal handler for AIX because the AIX unwinder uses the traceback table at the end of each function instead of FDE/CIE for unwinding. This patch adds a condition to exclude traceback table based unwinding from the code added by the patch. (cherry picked from commit d90fa61)
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/pull-request #101182 |
tru
pushed a commit
to llvmbot/llvm-project
that referenced
this pull request
Jul 31, 2024
…1069) Patch [llvm#92291](llvm#92291) causes wrong traceback from a signal handler for AIX because the AIX unwinder uses the traceback table at the end of each function instead of FDE/CIE for unwinding. This patch adds a condition to exclude traceback table based unwinding from the code added by the patch. (cherry picked from commit d90fa61)
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Patch llvm#92291 causes wrong traceback from a signal handler for AIX because the AIX unwinder uses the traceback table at the end of each function instead of FDE/CIE for unwinding. This patch adds a condition to exclude traceback table based unwinding from the code added by the patch.