SheepShaver doesn't run in 64-bit mode on macOS 10.10+

[vasi]

Yields "Killed: 9". LLDB reports "Malformed Mach-o file". Maybe lowmem is doing something wrong?

[chrisballinger]

lowmem definitely corrupts the binary, and it would only run if I disabled
it during the build steps, but I guess that breaks other things that depend
on whatever lowmem is doing.

On Wed, Nov 2, 2016 at 3:29 PM, Dave Vasilevsky notifications@github.com
wrote:

Yields "Killed: 9". LLDB reports "Malformed Mach-o file". Maybe lowmem is
doing something wrong?

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[asvitkine]

The 64-bit binaries work on older Mac OS X versions though. So it's
something that new versions of OS X reject.

On Wed, Nov 2, 2016 at 6:41 PM, Chris Ballinger notifications@github.com
wrote:

lowmem definitely corrupts the binary, and it would only run if I disabled
it during the build steps, but I guess that breaks other things that depend
on whatever lowmem is doing.

On Wed, Nov 2, 2016 at 3:29 PM, Dave Vasilevsky notifications@github.com
wrote:

Yields "Killed: 9". LLDB reports "Malformed Mach-o file". Maybe lowmem is
doing something wrong?

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[asvitkine]

So some questions I have is whether it's related to what OS lowmem runs on
and what binaries are input to it.

For example, it could choke on binaries compiled by clang - but might work
fine on binaries compiled by GCC and Xcode 3.2 on 10.6.

Or it could be that lowmem running on 10.12 doesn't work as intended.

On Wed, Nov 2, 2016 at 9:29 PM, Alexei Svitkine alexei.svitkine@gmail.com
wrote:

The 64-bit binaries work on older Mac OS X versions though. So it's
something that new versions of OS X reject.

On Wed, Nov 2, 2016 at 6:41 PM, Chris Ballinger notifications@github.com
wrote:

lowmem definitely corrupts the binary, and it would only run if I disabled
it during the build steps, but I guess that breaks other things that
depend
on whatever lowmem is doing.

On Wed, Nov 2, 2016 at 3:29 PM, Dave Vasilevsky <notifications@github.com

wrote:

Yields "Killed: 9". LLDB reports "Malformed Mach-o file". Maybe lowmem
is
doing something wrong?

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[vasi]

I believe I compiled that version of SheepShaver on 10.6. Not 100% sure though.

[asvitkine]

Yep, I am able to reproduce those results now. It doesn't work on 10.11
either. Trying to debug what's wrong.

On Wed, Nov 2, 2016 at 9:36 PM, Dave Vasilevsky notifications@github.com
wrote:

I believe I compiled that version of SheepShaver on 10.6. Not 100% sure
though.

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[asvitkine]

Here's the reason:

http://stackoverflow.com/a/26696361

It's a protection for 64-bit binaries that was added in 10.10. Basically,
it disallows page zero from having anything the NONE permission. Not sure
if there's anything we can do to workaround it, other than having
SheepShaver not require that page zero is mapped.

On Wed, Nov 2, 2016 at 9:59 PM, Alexei Svitkine alexei.svitkine@gmail.com
wrote:

Yep, I am able to reproduce those results now. It doesn't work on 10.11
either. Trying to debug what's wrong.

On Wed, Nov 2, 2016 at 9:36 PM, Dave Vasilevsky notifications@github.com
wrote:

I believe I compiled that version of SheepShaver on 10.6. Not 100% sure
though.

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[asvitkine]

(The other workaround obviously is continuing using the 32-bit version
which still supports having page zero with VM_PROT_ALL permissions.)

On Wed, Nov 2, 2016 at 10:09 PM, Alexei Svitkine alexei.svitkine@gmail.com
wrote:

Here's the reason:

http://stackoverflow.com/a/26696361

It's a protection for 64-bit binaries that was added in 10.10. Basically,
it disallows page zero from having anything the NONE permission. Not sure
if there's anything we can do to workaround it, other than having
SheepShaver not require that page zero is mapped.

On Wed, Nov 2, 2016 at 9:59 PM, Alexei Svitkine <alexei.svitkine@gmail.com

wrote:

Yep, I am able to reproduce those results now. It doesn't work on 10.11
either. Trying to debug what's wrong.

On Wed, Nov 2, 2016 at 9:36 PM, Dave Vasilevsky <notifications@github.com

wrote:

I believe I compiled that version of SheepShaver on 10.6. Not 100% sure
though.

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[lequeu]

I have v 2.4.20140201 Working . with OS 9.0 on Mac OSX 10.12.3.. With no issues so far. I did migrate the build from my 10.8.5 former machine

[RonaldPR]

When you check Finder Info for the SheepShaver application you will see that the option "Open in 32-bit mode" is checked.

[lequeu]

Indeed. When checking the finder "Open in 32bit mode" IS checked.