[Bug 46870] League of Legends 8.12+ fails to start a game in Vista+ mode ( anticheat engine, SystemExtendedProcessInformation)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46870

--- Comment #51 from Zebediah Figura <z.figura12 at gmail.com> ---
(In reply to Paul Gofman from comment #50)
> Created attachment 64154 [details]
> xaudio2_7: Preserve EBX in call_on_voice_processing_pass_start().
> 
> I could not help looking into this intriguing issue a bit more and found
> that the problem is that the
> IXAudio2VoiceCallback_OnVoiceProcessingPassStart callback does not preserve
> EBX register. It is apparently not the first time such callbacks are naughty
> this way, as there is already a workaround preserving %esi for EVE Online. 
> I am attaching the patch (on top of Staging) which fixes the issue for me.
> 
> There is the same callback with the same workaround for EVE online called in
> mainstream FAudio xaudio, but the problem is not there as the code is
> entirely different and function just ends after this callback call, so it
> apparently does not need that EBX anymore. Yet if anyone confirms that this
> patch is fixing the crash with some tricky build, it probably worth doing it
> there also.

Thanks for debugging further. I suspect we'd still want that in current Wine,
then; the fact that the current build successfully restores (or doesn't depend
on) EBX (and perhaps also other registers as well) is not something we can
depend on.

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