arm: link all .rodata variants into one output section

MFC after: 1 week

arm: align data section to the supersection.

Offset based data section alignment is probably not applicable to any system
other than i386.

MFC after: 4 week

arm: add read_frequently, read_mostly and exclusive_cache_line sections to linker script.

MFC after: 1 week

arm: fix symbols around the .ARM.exidx section

Insert a direct assignment to the location counter to ensure that orphaned
sections cannot be emitted between the _exidx_start symbol and the .ARM.exid

arm: fix symbols around the .ARM.exidx section

Insert a direct assignment to the location counter to ensure that orphaned
sections cannot be emitted between the _exidx_start symbol and the .ARM.exidx
section.

Discussed with: jrtc27
MFC after: 1 week

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arm: Fix typo in ldscript.arm.

MFC after: 1 week

kernel: Add defination of .init_array and .fini_array for all other platforms

Currently these sections are not used but defined only for amd64 and
i386. Added them for all other platforms to keep al

kernel: Add defination of .init_array and .fini_array for all other platforms

Currently these sections are not used but defined only for amd64 and
i386. Added them for all other platforms to keep all platforms in sync.
There should be no functional change.

This change is extracted from a bigger patch [1] of hselasky, with
additional fix for the order of .fini_array section.

1. https://reviews.freebsd.org/D40467

Obtained from: hselasky
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D45214

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kernel: Move the debug stuff into a common script

Move a copy of amd64's debug code into debug.ldscript. Make all the
kernels use this. This has the effect of modernizing the STABS for
powerpc as th

kernel: Move the debug stuff into a common script

Move a copy of amd64's debug code into debug.ldscript. Make all the
kernels use this. This has the effect of modernizing the STABS for
powerpc as the others were almost already in sync. For the ones that
weren't this adds the DWARF 3 debug symbols from i386/amd64.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D44071

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kernel: Sync ldscript files wrt gnu.attributes and .note.GNU-stack

Bring the keeping of .gnu.attributes to all architectures. Also discard
.note.GNU-stack on all archtiectures. Plus delete obsolete

kernel: Sync ldscript files wrt gnu.attributes and .note.GNU-stack

Bring the keeping of .gnu.attributes to all architectures. Also discard
.note.GNU-stack on all archtiectures. Plus delete obsolete comment that
was removed from i386 in 2010.

Sponsored by: Netflix
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44069

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

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

Eliminate the generated ldscript for arm and arm64, and strip $a/$d marker
symbols from the linked kernel.

The main thrust of this change is to generate a kernel that has the arm
"marker" symbols st

Eliminate the generated ldscript for arm and arm64, and strip $a/$d marker
symbols from the linked kernel.

The main thrust of this change is to generate a kernel that has the arm
"marker" symbols stripped. Marker symbols start with $a, $d, $t or $x, and
are emitted by the compiler to tell other toolchain components about the
locations of data embedded in the instruction stream (literal-pool
stuff). They are used for generating mixed-endian binaries (which we don't
support). The linked kernel has approximately 21,000 such symbols in it,
wasting space (500K in kernel.full, 190K in the final linked kernel), and
sometimes obscuring function names in stack tracebacks.

This change also simplifies the way the kernel is linked. Instead of using
sed to generate two different ldscript files to generate both an elf kernel
and a binary (elf headers stripped) kernel, we now use a single ldscript
that refers to a "text_start" symbol, and we provide the value for that
symbol using --defsym on the linker command line.

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MFHead @348740

Sponsored by: The FreeBSD Foundation

Expose the kernel's build-ID through sysctl

After our migration (of certain architectures) to lld the kernel is built
with a unique build-ID. Make it available via a sysctl and uname(1) to
allow th

Expose the kernel's build-ID through sysctl

After our migration (of certain architectures) to lld the kernel is built
with a unique build-ID. Make it available via a sysctl and uname(1) to
allow the user to identify their running kernel.

Submitted by: Ali Mashtizadeh <ali_mashtizadeh.com>
MFC after: 2 weeks
Relnotes: Yes
Event: Waterloo Hackathon 2019
Differential Revision: https://reviews.freebsd.org/D20326

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Merge ^/head r303250 through r304235.

remove CONSTRUCTORS from kernel linker scripts

The linker script CONSTRUCTORS keyword is only meaningful "when linking
object file formats which do not support arbitrary sections, such as
ECOFF and

remove CONSTRUCTORS from kernel linker scripts

The linker script CONSTRUCTORS keyword is only meaningful "when linking
object file formats which do not support arbitrary sections, such as
ECOFF and XCOFF"[1] and is ignored for other object file formats.

LLVM's lld does not yet accept (and ignore) CONSTRUCTORS, so just remove
CONSTRUCTORS from the linker scripts as it has no effect.

[1] https://sourceware.org/binutils/docs/ld/Output-Section-Keywords.html

Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D7343

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MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

MFH: tracking commit

Sponsored by: The FreeBSD Foundation

Merge head up to r262222 (last merge was incomplete).

MFH@261240.

Remove STARTUP_PAGETABLE_ADDR from the ARM configs and replace it with
memory at the end of the kernel.

This helps reduce the SoC and board specific configuration required.

Reviewed by: bsdimp
Test

Remove STARTUP_PAGETABLE_ADDR from the ARM configs and replace it with
memory at the end of the kernel.

This helps reduce the SoC and board specific configuration required.

Reviewed by: bsdimp
Tested by: jmg (armeb), br

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IFC @253398

Merge fresh head.

sync from head

MFC @248461