Merge ^/head r344549 through r344775.

Remove sv_pagesize, originally introduced with r100384.

In all of the architectures we have today, we always use PAGE_SIZE.
While in theory one could define different things, none of the
current arc

Remove sv_pagesize, originally introduced with r100384.

In all of the architectures we have today, we always use PAGE_SIZE.
While in theory one could define different things, none of the
current architectures do, even the ones that have transitioned from
32-bit to 64-bit like i386 and arm. Some ancient mips binaries on
other systems used 8k instead of 4k, but we don't support running
those and likely never will due to their age and obscurity.

Reviewed by: imp (who also contributed the commit message)
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D19280

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Remove iBCS2, part2: general kernel

Reviewed by: kib (previous version)
Sponsored by: The FreeBSD Foundation

Make cpu_set_syscall_retval common between the existing FreeBSD ABI and
the Linuxulator. We need to translate error values onto Linux errno values
and return them to userspace when a syscall fails. W

Make cpu_set_syscall_retval common between the existing FreeBSD ABI and
the Linuxulator. We need to translate error values onto Linux errno values
and return them to userspace when a syscall fails. We also need to preserve
x1 as all registers are preserved other than the return value.

Reviewed by: emaste
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D16008

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Initial arm64 linuxulator linux_sysvec

This is sufficient to run Linux arm64 'hello world' and other simple
binaries.

Reviewed by: andrew
Sponsored by: Turing Robotic Industries
Differential Revisi

Initial arm64 linuxulator linux_sysvec

This is sufficient to run Linux arm64 'hello world' and other simple
binaries.

Reviewed by: andrew
Sponsored by: Turing Robotic Industries
Differential Revision: https://reviews.freebsd.org/D15834

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