Add rudimentary support for building FreeBSD/arm64 with COMPAT_FREEBSD32.
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Authored by ed on Nov 18 2017, 1:03 PM.

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Reviewers

manu
andrew

Commits

rS326165: Add rudimentary support for building FreeBSD/arm64 with COMPAT_FREEBSD32.

Summary

Right now I'm using two Raspberry Pi's (2 and 3) to test CloudABI
support for armv6, armv7 and aarch64. It would be nice if I could
restrict this to just a single instance when testing smaller changes.
This is why I'd like to get COMPAT_CLOUDABI32 to work on arm64.

As COMPAT_CLOUDABI32 depends on COMPAT_FREEBSD32, at least for the ELF
loading, this change adds all of the bits necessary to at least build a
kernel with COMPAT_FREEBSD32. All of the machine dependent system calls
are still stubbed out, for the reason that implementations for these are
only useful if actual support for running FreeBSD binaries is added.
This is outside the scope of this work.

Test Plan

With this change and others, I am able to run CloudABI armv6/armv7
binaries on FreeBSD/arm64.

Diff Detail

Repository

rS FreeBSD src repository - subversion

Lint

Lint Not Applicable

Unit

Tests Not Applicable

Event Timeline

ed created this revision.Nov 18 2017, 1:03 PM

Herald added subscribers: emaste, imp. · View Herald TranscriptNov 18 2017, 1:03 PM

Harbormaster completed remote builds in B12828: Diff 35407.Nov 18 2017, 1:03 PM

manu added inline comments.Nov 18 2017, 6:35 PM

sys/arm64/include/param.h
54 ↗	(On Diff #35407)	I wonder if this should be aarch32 and that somewhere else we have a compat that say that aarch32 == armv7

manu added projects: ARM, arm64.Nov 18 2017, 6:36 PM

ed added inline comments.Nov 18 2017, 7:34 PM

sys/arm64/include/param.h
54 ↗	(On Diff #35407)	This is only used by `sysctl hw.machine` when accessed by 32-bit processes. I suspect it would make sense to pick `armv6` (or `armv7`) here to remain compatible with actual 32-bit systems.