[Bug 50801] Wine Mono crashes on macOS

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50801

--- Comment #2 from Esme Povirk <madewokherd at gmail.com> ---
Yep, looks like the crashing instruction is a movl %ecx,(%rax).

>From disassembling the function:

0x000000000295115b: movq        %gs:0x00000000000014e8,%r15
0x0000000002951164: leaq        0x0000000000000498(%r15),%rax
0x000000000295116b: movl        $0x200000001,%rcx
0x0000000002951170: movl        %ecx,(%rax)

So it has to do with our inability to set %gs maybe?

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