linux(4): Deduplicate mmap2

To help porting the Linux emulation layer to a new platforms start using
Linux names for conditional builds instead of architecture-specific ifdefs.

MFC after: 1 week

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

Remove /^\s*\*+\s*\$FreeBSD\$.*$\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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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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): Make struct stat64 to match Linux actual one

linux(4): Move dev_t type declaration under /compat/linux

As of version 2.6.0 of the Linux kernel, dev_t is a 32-bit unsigned integer
on all platforms. Move it into the MI linux.h under /compat/linu

linux(4): Move dev_t type declaration under /compat/linux

As of version 2.6.0 of the Linux kernel, dev_t is a 32-bit unsigned integer
on all platforms. Move it into the MI linux.h under /compat/linux.

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linux(4): Make struct newstat to match actual Linux one

In the struct stat the st_dev, st_rdev are unsigned long.

linux(4): Rename obsolete old struct l_stat to struct l_old_stat

linux(4): Fix LINUX_AT_COUNT comments

Differential Revision: https://reviews.freebsd.org/D39645
MFC after: 1 month

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): Reduce code duplication between MD files

Move struct ifnet definitions under compat/linux.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D38791

linux(4): Add coredump support to i386.

MFC after: 1 week

linux(4): Deduplicate MI futex structures.

MFC after: 1 week

linux(4): Reduce duplication between MD parts of the Linuxulator

Move sigprocmask actions defines under compat/linux,
they are identical across all Linux architectures.

MFC after: 2 weeks

linux(4): Handle 64-bit SO_TIMESTAMP for 32-bit binaries

To solve y2k38 problem in the recvmsg syscall the new SO_TIMESTAMP
constant were added on v5.1 Linux kernel. So, old 32-bit binaries
that kno

linux(4): Handle 64-bit SO_TIMESTAMP for 32-bit binaries

To solve y2k38 problem in the recvmsg syscall the new SO_TIMESTAMP
constant were added on v5.1 Linux kernel. So, old 32-bit binaries
that knows only 32-bit time_t uses the old value of the constant,
and binaries that knows 64-bit time_t uses the new constant.

To determine what size of time_t type is expected by the user-space,
store requested value (SO_TIMESTAMP) in the process emuldata structure.

MFC after: 2 weeks

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linux(4): Rework the definition of struct siginfo to match Linux actual one

Rework the defintion of struct siginfo so that the array padding
struct siginfo to SI_MAX_SIZE can be placed in a union al

linux(4): Rework the definition of struct siginfo to match Linux actual one

Rework the defintion of struct siginfo so that the array padding
struct siginfo to SI_MAX_SIZE can be placed in a union along side of the
rest of the struct siginfo members. The result is that we no longer need
the __ARCH_SI_PREAMBLE_SIZE or SI_PAD_SIZE definitions.

Move struct siginfo definition under /compat/linux to reduce MD part.
To avoid headers polution include linux_siginfo.h in the MD linux.h

MFC after: 2 weeks

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linux(4): Move sigframe definitions to separate headers

The signal trampoine-related definitions are used only in the MD part
of code, wherefore moved from everywhere used linux.h to separate MD
hea

linux(4): Move sigframe definitions to separate headers

The signal trampoine-related definitions are used only in the MD part
of code, wherefore moved from everywhere used linux.h to separate MD
headers.

MFC after: 2 weeks

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linux(4): Cleanup signal trampolines

This is the first stage of a signal trampolines refactoring.

From trampolines retired emulation of the 'call' instruction, which is
replaced by direct call of a

linux(4): Cleanup signal trampolines

This is the first stage of a signal trampolines refactoring.

From trampolines retired emulation of the 'call' instruction, which is
replaced by direct call of a signal handler. The signal handler address
is in the register.

The previous trampoline implemenatation used semi-Linux-way to call
a signal handler via the 'jmp' instruction. Wherefore the trampoline
emulated a 'call' instruction to into the stack the return address for
signal handler's 'ret' instruction. Wherefore handmade DWARD annotations
was used.

While here rephrased and removed excessive comments.

MFC after: 2 weeks

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linux: implement sigaltstack(2) on arm64

... by making it machine-independent.

Reviewed By: dchagin
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D31286

linux(4); Almost complete the vDSO.

The vDSO (virtual dynamic shared object) is a small shared library that the
kernel maps R/O into the address space of all Linux processes on image
activation. The

linux(4); Almost complete the vDSO.

The vDSO (virtual dynamic shared object) is a small shared library that the
kernel maps R/O into the address space of all Linux processes on image
activation. The vDSO is a fully formed ELF image, shared by all processes
with the same ABI, has no process private data.

The primary purpose of the vDSO:
- non-executable stack, signal trampolines not copied to the stack;
- signal trampolines unwind, mandatory for the NPTL;
- to avoid contex-switch overhead frequently used system calls can be
implemented in the vDSO: for now gettimeofday, clock_gettime.

The first two have been implemented, so add the implementation of system
calls.

System calls implemenation based on a native timekeeping code with some
limitations:
- ifunc can't be used, as vDSO r/o mapped to the process VA and rtld
can't relocate symbols;
- reading HPET memory is not implemented for now (TODO).

In case on any error vDSO system calls fallback to the kernel system
calls. For unimplemented vDSO system calls added prototypes which call
corresponding kernel system call.

Tested by: trasz (arm64)
Differential revision: https://reviews.freebsd.org/D30900
MFC after: 2 weeks

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linux(4): Retire a now unused include.

MFC after: 2 weeks

linux(4): Rework Linux ppoll system call.

For now the Linux emulation layer uses in kernel ppoll(2) without
conversion of user supplied fd 'events', and does not convert the
kernel supplied fd 'reve

linux(4): Rework Linux ppoll system call.

For now the Linux emulation layer uses in kernel ppoll(2) without
conversion of user supplied fd 'events', and does not convert the
kernel supplied fd 'revents'.

At least POLLRDHUP is handled by FreeBSD differently than by
Linux. Seems that Linux silencly ignores POLLRDHUP on non socket fd's
unlike FreeBSD, which does more strictly check and fails.

Rework the Linux ppoll, using kern_poll and converting 'events'
and 'revents' values.
While here, move poll events defines to the MI part of code as they
mostly identical on all arches except arm.

Differential Revision: https://reviews.freebsd.org/D30716
MFC after: 2 weeks

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linux(4): add struct timespec64 definition and conversion routine for
future use.

MFC after: 2 weeks

linux(4); Retire unnecessary __packed attribute from some struct's
definition.

Differential Revision: https://reviews.freebsd.org/D30482
MFC after: 2 weeks

i386: clean up empty lines in .c and .h files