[Bug 41618] TESV: Skyrim Special Edition - black screen on launch

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=41618

--- Comment #5 from Kimmo Myllyvirta <kimmo.myllyvirta at gmail.com> ---
Created attachment 56790
  --> https://bugs.winehq.org/attachment.cgi?id=56790
debug log, backtrace

This seems to be the same issue as in bug #38668. Crashes at the same place,
and backtraces are very similar.

Human readable log and backtrace attached (I hacked SetUnhandledExceptionFilter
to just return the top_filter in order to get it, since the game doesn't
generate minidumps or anything here, it just catches the exception and does
nothing - just hangs there with a black screen.)

The crash happens here;
=>0 0x000000003b3b1ca2 in xaudio2_7 (+0x71ca2) (0x00007fffff5dff08)

The native xaudio2_7 does some interesting bit shifting with pointers (the
crash happens in some kind of list code, or when filling it, "SimpList" based
on the OutputDebugString calls).

It basically does (pseudocode);
val = (ptr << 21) + (someValue & 0x7FFFFF);
then later it does;
ptr2 = (val >> 21) & 0x7FFFFFFFFF8;
and tries to access *ptr2

movq    0x0000000000000010(%r9),%r8
movq    0x0000000000000008(%r9),%rax
movq    %r8,%r10
shrq    $0x15,%r10
andq    %rsi,%r10
movq    (%r10),%rdx <- crashes here
movq    0x0000000000000010(%r9),%rcx
shrq    $0x15,%rdx
andq    %rsi,%rdx
cmpq    %rcx,%r8

Well, this works if you are lucky, but in this case;
0x7fffff5e1680
truncates to;
0x7ffff5e1680
->page fault

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