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Subject: |
Emacs on Apple ARM devices |
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Date: |
Mon, 22 Jun 2020 00:13:15 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 |
Code generation on Apple's ARM devices is mostly similar to MacOS,
except that they expect a code signature section, which to avoid
wasting too many bytes, are not aligned on page size as with code,
but rather to nearest 16 bytes. In addition, the ARM compiler will
also emit some relative pointer relocation records, which it seems
can be safely ignored as sections aren't rearranged.
This changeset implements those changes on the Mach-O dumper so
that Emacs can be compiled for ARM devices. With the ongoing
convergence between the MacOS and iOS platform, and the increasing
importance of code-signing in later MacOS versions, I think it
could be nice to mainline these changes.
Since these sections do not occur in current MacOS builds -
otherwise they would generate errors for being unknown - the
changes should not impact existing places where Emacs build, and
it would not work on iOS without to begin with.
Hat tip to Aaron Griffith for sharing his knowledge.
--
Sincerely,
Roland Kaufmann
0001-Let-us-know-unknown-number-being-complained-about.patch
Description: Text Data
0002-Make-function-generally-available-for-sections.patch
Description: Text Data
0003-Allow-padding-of-sections-to-other-than-page-size.patch
Description: Text Data
0004-Output-code-signature-sections-align-on-16-bytes.patch
Description: Text Data
0005-Make-relocation-of-relative-pointers-a-no-op.patch
Description: Text Data
0006-Allow-build-configuration-on-Apple-ARM-devices.patch
Description: Text Data
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--- Begin Message ---
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Subject: |
Re: bug#41994: Emacs on Apple ARM devices |
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Date: |
Sat, 15 Aug 2020 18:17:08 +0200 (CEST) |
On Sat, Aug 15, 2020 at 01:45:18PM +0200, Robert Pluim wrote:
> >>>>> On Fri, 14 Aug 2020 22:11:46 +0200 (CEST), Alan Third <alan@idiocy.org>
> >>>>> said:
> Alan> That's what I was wondering (although to be honest I never even
> Alan> noticed there were patches attached).
>
> Alan> I suspect the patch to configure.ac might be needed even for the
> Alan> pdumpder?
>
> Yes, I think so. If someone sends me an arm-based mac Iʼm willing to
> test that hypothesis :-)
>
> Seriously, itʼs a one-liner. I think we can commit it as obvious.
I've pushed it with the copyright exempt tag.
4cba236749aafade7bd88cf2a10be48f44983faa
I don't think there's any point keeping this bug report open, so I'll
close it now.
Thanks.
--
Alan Third
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