[Bug 49698] New: Unwinding with a PE based ntdll.dll fails in some cases

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49698

            Bug ID: 49698
           Summary: Unwinding with a PE based ntdll.dll fails in some
                    cases
           Product: Wine
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: wine-bugs at winehq.org
          Reporter: martin at martin.st
      Distribution: ---

Created attachment 67943
  --> https://bugs.winehq.org/attachment.cgi?id=67943
Testcase

If ntdll is built as a PE, some unwinding cases (that, as far as I understand,
unwind through ntdll itself) fail, where the testcases succeed if wine is built
with --without-mingw.

The attached testcase that fails is built from
https://github.com/microsoft/compiler-tests/blob/master/eh/ehthrow.cxx with "cl
ehthrow.cxx -Feehthrow-msvc-x64.exe -EHsc -O2" using MSVC 19.24.28314 for x64.

FWIW, in a non-PE build, this testcase also regressed earlier, in
887332f9c7bf0d75f53f88a9739b77b12463d636 "ntdll: Fix KiUserExceptionDispatcher
ABI on x86_64.", but was fixed again by
12dba1b2ae50099de4cd857f867ebcaefe6852d8 "ntdll: Fix PE unwind info for %rsi,
%rdi in KiUserExceptionDispatcher." I think.

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