[Bug 40068] Custom assembly program crashes under Wine

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40068

--- Comment #14 from Sebastian Lackner <sebastian at fds-team.de> ---
(In reply to Andrew Kennedy from comment #11)
> There is no stack corruption under XP.

It always corrupts the stack, with more or less critical consequences. Michael
Müller spotted what is going wrong:

--- snip ---
FireThread:
    [...]
    sub ebp,12                 ; as 3 local variables
--- snip ---

The register %ebp was never properly initialized, effectively corrupting the
variables of the parent function. Depending on the Windows version, the
registers are initialized a bit different, effectively hiding all the trouble
on Windows XP. Dmitry wrote a patch to "fix" it, which I've added to the
Staging tree.

I can't guarantee that the patch will be accepted though. It is out of the
scope of wine to be 100% bug-compatible with Windows, especially when your
application is clearly doing something which can't work.

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