Kernel support for Thumb-2
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Authored by andrew on Apr 25 2015, 4:25 PM.

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ARM
manpages

Summary

This adds the kernel support to run Thumb-2 in userland. With this I can
boot a mostly thumb-2 userland to multiuser mode. There are still a few
segfaults on boot, but further investigation is needed to find if this
is a toolchain or kernel issue.

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rS FreeBSD src repository - subversion

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andrew updated this revision to Diff 4999.Apr 25 2015, 4:25 PM

andrew retitled this revision from to Kernel support for Thumb-2.

andrew updated this object.

andrew edited the test plan for this revision. (Show Details)

andrew added a reviewer: ARM.

Herald added a reviewer: manpages. · View Herald TranscriptApr 25 2015, 4:25 PM

Herald added subscribers: imp, andrew. · View Herald Transcript

So this is only for thumb2, which is only available on armv7?

I also don't see sanity checks to make sure that the libraries loaded are compatible, but that's an issue that's well beyond the scope of this one problem.

sys/arm/arm/undefined.c
247	That doesn't seem to be the right #define for this.

andrew added inline comments.Apr 26 2015, 11:17 AM

sys/arm/arm/undefined.c
247	This code has only been moved and had it's indentation changed, the check was already there.

In D2367#43160, @imp wrote:

So this is only for thumb2, which is only available on armv7?

It would also work on ARMv6T2, however we don't support it.

I also don't see sanity checks to make sure that the libraries loaded are compatible, but that's an issue that's well beyond the scope of this one problem.

There are a number of userland changes needed, but a binary built targeting the correct architecture should just work.

Was this committed in r282779? Could it be closed?

Committed