sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

_ARM_ARCH_5E is always defined, we not support older CPUs.

Rename assym.s to assym.inc

assym is only to be included by other .s files, and should never
actually be assembled by itself.

Reviewed by: imp, bdrewery (earlier)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D14180

Add missing stack unwind information to several assembly functions on
ARMv6/7:

- Define _SAVE() macro to allow unwind data to be conditionally defined for
ARM assembly code in the kernel.

- Use _SAVE() to provide unwind information for bcopy_page(), and two (of
many) instances of copyin() and copyout().

Reviewed by: andrew, imp
MFC after: 3 days
Sponsored by: University of Cambridge

Add an END macro to ARM. This is mostly used to tell gas where the bounds
of the functions are when creating the EABI unwind tables.

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

- Import the HEAD csup code which is the basis for the cvsmode work.

Do not use __XSCALE__ to detect if pld/strd/ldrd is available, use
_ARM_ARCH_5E instead.

MFC After: 3 days

Export PAGE_SIZE from genassym.c, and include assym.s in bcopy_page.S,
instead of <machine/param.h>.

Start all license statements with /*-

Use the RET macro.

Import FreeBSD/arm kernel bits.
It only supports sa1110 (on simics) right now, but xscale support should come
soon.
Some of the initial work has been provided by :
Stephane Potvin <sepotvin at videotron.ca>
Most of this comes from NetBSD.