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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sysent: retire unused SV_IA32

When COMPAT_IA32 was generaliaed to COMPAT_FREEBSD32 in 2010 (commit
841c0c7ec75b), all runtime uses of SV_IA32 were removed in favor of
SV_ILP32 check. Given SV_ILP32

sysent: retire unused SV_IA32

When COMPAT_IA32 was generaliaed to COMPAT_FREEBSD32 in 2010 (commit
841c0c7ec75b), all runtime uses of SV_IA32 were removed in favor of
SV_ILP32 check. Given SV_ILP32's existance it makes no
sense to dynamically check for SV_IA32 (even if we had a 32-bit x86 ABI
with 64-bit time_t we needed to differentiate, SV_IA32 would be the
wrong spelling.) As such, remove SV_IA32 and mark the bit reserved.

Reviewed by: kib
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D50672

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linux: Check for copyout errors in linux_fixup()

This is in preparation for annotating copyin() and related functions
with __result_use_check.

Reviewed by: olce, dchagin
MFC after: 1 week
Different

linux: Check for copyout errors in linux_fixup()

This is in preparation for annotating copyin() and related functions
with __result_use_check.

Reviewed by: olce, dchagin
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D43104

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linux(4): Drop the outdated comments about sixth register on i386 int0x80

This is well documented in the Linux syscall(2).

MFC after: 1 week

syscalls: fix missing SIGSYS for several ENOSYS errors

In particular, when the syscall number is too large, or when syscall is
dynamic. For that, add nosys_sysent structure to pass fake sysent to
s

syscalls: fix missing SIGSYS for several ENOSYS errors

In particular, when the syscall number is too large, or when syscall is
dynamic. For that, add nosys_sysent structure to pass fake sysent to
syscall top code.

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

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

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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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 i386/linux

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

MFC after: 2 weeks

linux(4): Attach netlink on i386.

Discussed with: melifaro
MFC after: 3 days

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

linux(4): Deduplicate linux_fixup_elf().

Use native routines to fixup initial process stack. On Arm64 linux_elf_fixup() is
noop, as it do the stack fixup (room for argc) in the linux_copyout_strings

linux(4): Deduplicate linux_fixup_elf().

Use native routines to fixup initial process stack. On Arm64 linux_elf_fixup() is
noop, as it do the stack fixup (room for argc) in the linux_copyout_strings().

MFC after: 1 week

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linux(4): Add coredump support to i386.

MFC after: 1 week

linux: populate sv_syscallnames in each sysentvec

This allows the syscallname() function to give a usable result for Linux
ABIs.

Reported by: jrtc27
Reviewed by: jrtc27, markj, jhb
MFC after: 1 wee

linux: populate sv_syscallnames in each sysentvec

This allows the syscallname() function to give a usable result for Linux
ABIs.

Reported by: jrtc27
Reviewed by: jrtc27, markj, jhb
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D37199

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Rework how shared page related data is stored

Store the shared page address in struct vmspace.
Also instead of storing absolute addresses of various shared page
segments save their offsets with resp

Rework how shared page related data is stored

Store the shared page address in struct vmspace.
Also instead of storing absolute addresses of various shared page
segments save their offsets with respect to the shared page address.
This will be more useful when the shared page address is randomized.

Approved by: mw(mentor)
Sponsored by: Stormshield
Obtained from: Semihalf
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D35393

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linux(4): Properly restore the thread signal mask after signal delivery on i386

Replace sigframe sf_extramask by native sigset_t and use it to
store/restore the thread signal mask without conversion

linux(4): Properly restore the thread signal mask after signal delivery on i386

Replace sigframe sf_extramask by native sigset_t and use it to
store/restore the thread signal mask without conversion to/from
Linux signal mask.

Pointy hat to: dchagin
MFC after: 2 weeks

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linux(4): Deduplicate bsd_to_linux_trapcode()

As bsd_to_linux_trapcode() is common for x86 Linuxulators,
move it under x86/linux.

MFC after: 2 weeks

linux(4): Deduplicate translate_traps()

As translate_traps() is common for x86 Linuxulators,
move it under x86/linux.

MFC after: 2 weeks

Retire sv_transtrap

Call translate_traps directly from sendsig().

MFC after: 2 weeks

linux(4): Retire handmade DWARF annotations from signal trampolines

The Linux exports __kernel_sigreturn and __kernel_rt_sigreturn from the
vdso. Modern glibc's sigaction sets the sa_restorer field

linux(4): Retire handmade DWARF annotations from signal trampolines

The Linux exports __kernel_sigreturn and __kernel_rt_sigreturn from the
vdso. Modern glibc's sigaction sets the sa_restorer field of sigaction
to the corresponding vdso __sigreturn, and sets the SA_RESTORER.
Our signal trampolines uses the FreeBSD-way to call a signal handler,
so does not use the sigaction's sa_restorer.

However, as glibc's runtime linker depends on the existment of the vdso
__sigreturn symbols, for all Linuxulators was added separate trampolines
named __sigcode with DWARF anotations and left separate __sigreturn
methods, which are exported.

MFC after: 2 weeks

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linux(4): Better naming for ucontext field of struct rt_sigframe

To reduce sendsig code difference and to avoid confusing me,
rename sf_sc to sf_uc to match the content.

MFC after: 2 weeks