csu: add the "Retain" flag to notes sections flag

It should make the notes immune against --gc-sections.

Reported and tested by: bapt
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

csu: Teach csu about PAC and BTI

Add the Branch Target Identification (BTI) note to libc assembly
sources and Pointer Authentication Code (PAC) instructions to _init and
_fini.

_init and _fini may

csu: Teach csu about PAC and BTI

Add the Branch Target Identification (BTI) note to libc assembly
sources and Pointer Authentication Code (PAC) instructions to _init and
_fini.

_init and _fini may be called indirectly so need a BTI landing pad. As
they are non-leaf functions use the appropriate PAC instruction that
also guards against changing the link register.

As all object files need the note for any binary using these object files
we need to insert it in all asm files.

Reviewed by: markj
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D42227

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Remove $FreeBSD$: one-line .c pattern

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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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csu: Add missing GNU-stack annotations to note object files.

ld.bfd marks the stack as executable for the crt objects due to the
missing annotations which raises a fatal warning starting with versio

csu: Add missing GNU-stack annotations to note object files.

ld.bfd marks the stack as executable for the crt objects due to the
missing annotations which raises a fatal warning starting with version
2.39.

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MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

Include ABI note tag in shared libraries.

Split the ELF feature note into a separate file that is linked into
*crt1.o the same as crtbrand.S was before. crtbrand.o is now linked
into crti.o on all

Include ABI note tag in shared libraries.

Split the ELF feature note into a separate file that is linked into
*crt1.o the same as crtbrand.S was before. crtbrand.o is now linked
into crti.o on all platforms in addition to *crt1.o.

Reviewed by: kib
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D25304

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Remove the sed hack for ABI tag notes.

The ELF notes compiled in C were placed in a section with the wrong type
(SHT_PROGBITS instead of SHT_NOTE). Previously, sed was used on the
generated assembl

Remove the sed hack for ABI tag notes.

The ELF notes compiled in C were placed in a section with the wrong type
(SHT_PROGBITS instead of SHT_NOTE). Previously, sed was used on the
generated assembly to rewrite the section type. Instead, write the notes
in assembly which permits setting the correct section type directly.

While here, move inline assembly entry points out of C and into assembly
for aarch64, arm, and riscv.

Reviewed by: kib
Tested on: amd64 (cirrus-ci), riscv64
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D25211

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