[Bug 59042] New: winevdm is incompatible with Rosetta 2

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59042

            Bug ID: 59042
           Summary: winevdm is incompatible with Rosetta 2
           Product: Wine
           Version: 10.19
          Hardware: aarch64
                OS: MacOS
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dos
          Assignee: wine-bugs(a)list.winehq.org
          Reporter: computers57(a)hotmail.com

Attempting to run a win16 game on Apple Silicon via Rosetta results in a
failure for Rosetta 2:

    rosetta error: LDT 0xf33f0488323f not supported

This has been tested against chip's challenge and SkiFree.

I think this is a problem with Rosetta 2 that can't be resolved except via
emulating a 16-bit Intel CPU as Rosetta 2 lacks the needed 16-bit call
emulation.

One possible solution would be to do what MS does for running 32-bit Intel
software under 64-bit ARM CPUs, but work would need to be done on the Mac side
for that to happen.

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[Bug 59042] winevdm is incompatible with Rosetta 2

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59042

Brendan Shanks <[e-mail]> changed:

           What    |Removed                     |Added
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                 CC|                            |[e-mail]

--- Comment #1 from Brendan Shanks <[e-mail]> ---
Right, Rosetta 2 doesn't support x86 segmentation (beyond having one segment
that covers the entirety of the 32-bit address space).

The only thing Wine can do about this (aside from a different CPU emulator) is
try to handle the failure better. The Rosetta error occurs when calling
i386_set_ldt() but that function doesn't return: instead the process just
hangs, takes 100% of a CPU, and needs to be kill -9'ed.
It would be nicer to detect an LDT that Rosetta is going to reject, then print
an error and terminate the process instead.

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