[Bug 39993] New: OllyDbg fails to change some registers

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39993

            Bug ID: 39993
           Summary: OllyDbg fails to change some registers
           Product: Wine
           Version: 1.9.0
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kernel32
          Assignee: wine-bugs at winehq.org
          Reporter: b7.10110111 at gmail.com
      Distribution: ---

If you try to set some registers in OllyDbg while debugging an application,
it'll reset them to original values after single step. This must mean that its
write request has failed.

To reproduce:

1. Run OllyDbg (2.x)
2. File->Open, choose any PE file, e.g. Test.exe from OllyDbg distribution
3. Press space bar, assemble something like `dw 0xfeeb` to make sure no
registers are changed on single step
4. Try to change any of the following registers (others work correctly):
   * ST2 or any other FPU data register
   * FST
   * FCW
   * MXCSR
   * data register tags via right clicking on "empty" and selecting "zero"
5. Single step (pressing F7)
6. See the changed registers return to original values, i.e. fail to actually
change

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