sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

arm: Remove obsolete comments

FreeBSD has never supported arm26, so remove comments about what
trapframes look like for that platform.

Noticed by: kevans
Sponsored by: Netflix

Remove the pre-ARMv6 and pre-INTRNG code.
ARM has required ARMV6+ and INTRNg for some time now, so remove
always false #ifdefs and unconditionally do always true #ifdefs.

arm: clean up empty lines in .c and .h files

sys/arm: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error

sys/arm: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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Preserve VFP state across signal delivery.

We don't have enouch space to store full VFP context within mcontext
stucture. Due to this:
- follow i386/amd64 way and store VFP state outside of the mco

Preserve VFP state across signal delivery.

We don't have enouch space to store full VFP context within mcontext
stucture. Due to this:
- follow i386/amd64 way and store VFP state outside of the mcontext_t
but point to it. Use the size of VFP state structure as an 'magic'
indicator of the saved VFP state presence.
- teach set_mcontext() about this external storage.
- for signal delivery, store VFP state to expanded 'struct sigframe'.

Submited by: Andrew Gierth (initial version)
PR: 217611
MFC after: 2 weeks

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Merge ^/head r305892 through r306302.

Make it possible to safely use TPIDRURW from userspace.

On amd64, arm64 and i386, we have the possibility to switch between TLS
areas in userspace. The nice thing about this is that it makes it easi

Make it possible to safely use TPIDRURW from userspace.

On amd64, arm64 and i386, we have the possibility to switch between TLS
areas in userspace. The nice thing about this is that it makes it easier
to do light-weight threading, if we ever feel like doing that. On armv6,
let's go into the same direction by making it possible to safely use the
TPIDRURW register, which is intended for this purpose.

Clean up the ARMv6 code to remove md_tp entirely. Simply add a dedicated
field to the PCB to hold the value of TPIDRURW across context switches,
like we do for any other register. As userspace currently uses the
read-only TPIDRURO register, simply ensure that we keep both values in
sync where possible. The system calls for modifying the read-only
register will simply write the intended value into both registers, so
that it lazily ends up in the PCB during the next context switch.

Reviewed by: https://reviews.freebsd.org/D7951
Approved by: andrew
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D7951

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Merge sync of head

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

MFhead @ r276594

Merge ^/head r274961 through r276301.

Cleanup up ARM *frame structures...

- Eliminate unused irqframe
- Eliminate unused saframe
- Instead of splitting r4-sp storage between the stack and switchframe,
just put all the registers in

Cleanup up ARM *frame structures...

- Eliminate unused irqframe
- Eliminate unused saframe
- Instead of splitting r4-sp storage between the stack and switchframe,
just put all the registers in switchframe and eliminate the un_32 struct.

Submitted by: Svatopluk Kraus <onwahe@gmail.com>,
Michal Meloun <meloun@miracle.cz>

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Merge head

IFC @264767

MFC @ r259205 in preparation for some SVM updates. (for real this time)

Merge head r232040 through r257457.
M usr.sbin/portsnap/portsnap/portsnap.8
M usr.sbin/portsnap/portsnap/portsnap.sh
M usr.sbin/tcpdump/tcpdump/Makefile

Remove the last dregs of trapframe_t. It turns out only arm was using
this type, so remove it to make arm code more consistant with other
platforms. Thanks to bde@ for pointing out only arm used tr

Remove the last dregs of trapframe_t. It turns out only arm was using
this type, so remove it to make arm code more consistant with other
platforms. Thanks to bde@ for pointing out only arm used trapframe_t.

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Merge head r233826 through r256722.

IFC @256277

Approved by: ken (mentor)

Merge from head

IFC @ r255209

IFC @ r254014

When entering exception handlers we may not have an aligned stack. This is
because an exception may happen at any time. The stack alignment rules on
ARM EABI state the only place the stack must be 8-

When entering exception handlers we may not have an aligned stack. This is
because an exception may happen at any time. The stack alignment rules on
ARM EABI state the only place the stack must be 8-byte aligned is on a
function boundary.

If an exception happens while a function is setting up or tearing down it's
stack frame it may not be correctly aligned. There is also no requirement
for it to be when the function is a leaf node.

The fix is to align the stack after we have stored a backup of the old stack
pointer, but before we have stored anything in the trapframe. Along with
this we need to adjust the size of the trapframe by 4 bytes to ensure the
stack below it is also correctly aligned.

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