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[libunwind][AIX] Fix the wrong traceback from signal handler (#101069)

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Patch [llvm#92291](https://github.com/llvm/llvm-project/pull/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.
This commit is contained in:
Xing Xue 2024-07-30 06:28:59 -04:00 committed by GitHub
parent 95e9afff30
commit d90fa61260
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2 changed files with 3 additions and 2 deletions
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3
libunwind/src/UnwindCursor.hpp
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@ -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.

2
libunwind/test/aix_signal_unwind.pass.sh.S
View File

@ -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}