[Bug 25310] New: Bugs in RtlUnwindEx

http://bugs.winehq.org/show_bug.cgi?id=25310

Summary: Bugs in RtlUnwindEx
           Product: Wine
           Version: unspecified
          Platform: x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

MSDN (http://msdn.microsoft.com/en-us/library/ms680615(VS.85).aspx) describes
the passed context as scratch-space, not something that the application has to
initialize. The wine implemetation expect a valid context.

Looking at the debug output, it is also clearly visible, that the wine
implementation unwinds the stack pointer one stack frame to far.

The attached patch fixes these problems:
* RtlUnwindEx is called via DEFINE_REGS_ENTRYPOINT and the new context is used
as starting point.
* Stay at the same context, if the target stack frame has been reached.

There have been more infomation about the internal of RtlUnwindEx published:
http://www.nynaeve.net/?p=113

The patch make RtlUnwindEx more compilant with this description - it is still
incomplete.