imgact: Mark brandinfo and note structures as const

No functional change intended.

Reviewed by: olce, kib, emaste
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D53062

sys: Add AT_HWCAP3 and AT_HWCAP4

It is likely we will need these on arm64. Add them in preparation for
flags in these to be added at some point in the future.

Reviewed by: brooks, imp, kib
Sponsore

sys: Add AT_HWCAP3 and AT_HWCAP4

It is likely we will need these on arm64. Add them in preparation for
flags in these to be added at some point in the future.

Reviewed by: brooks, imp, kib
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D51005

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amd64: add pcb_tlsbase

This is a value for TLS base that would be explicitly set by user.
It is forced into the fsbase register on entry to signal handler, making
TLS in the handler usable even if u

amd64: add pcb_tlsbase

This is a value for TLS base that would be explicitly set by user.
It is forced into the fsbase register on entry to signal handler, making
TLS in the handler usable even if userspace uses segmentation.

Reported and tested: Alex S <iwtcex@gmail.com>
Tested by: pho
Reviewed by: olce
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D50482

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amd64/linux*: mark brandlists as static

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

linux(4): Deorbit linux_nosys

Differential Revision: https://reviews.freebsd.org/D41901
MFC after: 1 week

linuxolator: fix nosys() to not send SIGSYS

Reviewed by: dchagin, markj
Discussed with: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/

linuxolator: fix nosys() to not send SIGSYS

Reviewed by: dchagin, markj
Discussed with: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D41976

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linux(4): Cleanup includes under amd64/linux

No functional changes.

MFC after: 1 week

linux(4): Remove sys/cdefs.h inclusion where it's not needed due to 685dc743

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

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

linux(4): Add elf_hwcap2 to x86

On x86 Linux via AT_HWCAP2 the user controlled (by tunables) processor
capabilities are exposed.

Reviewed by:
Differential Revision: https://reviews.freebsd.org/D411

linux(4): Add elf_hwcap2 to x86

On x86 Linux via AT_HWCAP2 the user controlled (by tunables) processor
capabilities are exposed.

Reviewed by:
Differential Revision: https://reviews.freebsd.org/D41165
MFC after: 2 weeks

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linux(4): Preserve fpu xsave state across signal delivery on amd64

PR: 270247
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D40444
MFC after: 2 weeks

linux(4): In preparation for xsave refactor fxsave code on amd64

Due to fxsave area is os independent reimplement fxsave handmade code
using copying of a whole area.

Reviewed by: kib
Differential

linux(4): In preparation for xsave refactor fxsave code on amd64

Due to fxsave area is os independent reimplement fxsave handmade code
using copying of a whole area.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D40443
MFC after: 2 weeks

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linux(4) rt_sendsig: Remove the use of caddr_t

Replace caddr_t by more appropriate char *.

MFC after: 2 weeks

linux(4): Use pwd_altroot() to tell namei() about ABI root path

PR: 72920
Differential Revision: https://reviews.freebsd.org/D40090
MFC after: 2 month

linux(4): Preserve %rcx (return address) like a Linux do

Perhaps, this does not makes much sense as destroyng %rcx declared by
the x86_64 Linux syscall ABI. However,:
a) if we get a signal while we

linux(4): Preserve %rcx (return address) like a Linux do

Perhaps, this does not makes much sense as destroyng %rcx declared by
the x86_64 Linux syscall ABI. However,:
a) if we get a signal while we are in the kernel, we should restore
tf_rcx when preparing machine context for signal handlers.
b) the Linux world is strange, someone can depend on %rcx value
after syscall, something like go.

Differential Revision: https://reviews.freebsd.org/D40155
MFC after: 1 month

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linux(4): Simplify %r10 restoring on amd64

Restore %r10 at system call entry to avoid doing this multiply times.

Differential Revision: https://reviews.freebsd.org/D40154
MFC after: 1 month

linux(4): Add a comment explaining registers at syscall entry point on amd64

Differential Revision: https://reviews.freebsd.org/D40153
MFC after: 1 month

linux(4): Drop a weird comment from linux_set_syscall_retval on amd64

I agree, it would be great to avoid PCB_FULL_IRET, however we should
follow Linux system call ABI.

Reviewed by: emaste
Differe

linux(4): Drop a weird comment from linux_set_syscall_retval on amd64

I agree, it would be great to avoid PCB_FULL_IRET, however we should
follow Linux system call ABI.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D40152
MFC after: 1 month

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linux(4): Deduplicate linux_copyout_auxargs()

Export default MINSIGSTKSZ value for the x86 until we do not preserve AVX
registers in the signal context.

Differential Revision: https://reviews.freeb

linux(4): Deduplicate linux_copyout_auxargs()

Export default MINSIGSTKSZ value for the x86 until we do not preserve AVX
registers in the signal context.

Differential Revision: https://reviews.freebsd.org/D39644
MFC after: 1 month

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linux(4): Cleanup includes under amd64/linux

Cleanup unneeded includes, sort the rest according to style(9).
No functional changes.

MFC after: 2 weeks

linux(4): Remove stale comment that no longer applies.

MFC after: 1 week

linux(4): Microoptimize rt_sendsig() on amd64.

Drop proc lock earlier, before copying user stuff.

Pointed out by: kib
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D38326
MF

linux(4): Microoptimize rt_sendsig() on amd64.

Drop proc lock earlier, before copying user stuff.

Pointed out by: kib
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D38326
MFC after: 1 week

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linux(4): Preserve fpu fxsave state across signal delivery on amd64.

PR: 240768
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D38302
MFC after: 1 week

linux(4): Deduplicate linux_trans_osrel().

MFC after: 1 week

linux(4): Deduplicate linux_copyout_strings().

It is still present in the 32-bit Linuxulator on amd64.

MFC after: 1 week