MFC r345471, r345472, r346603:

Update syscall.master to 5.0.

For 32-bit Linuxulator, ipc() syscall was historically
the entry point for the IPC API. Starting in Linux 4.18, direct
syscalls are provided for the IPC. Enable it.

MFC r329794, r329801 (by emaste@):

Correct proper nouns in the Linuxulator

- Capitalize Linux
- Spell FreeBSD out in full
- Address some style(9) on changed lines

MFC r342933:
Fix errno values returned from DUMMY_XATTR linuxulator calls

Reported by: weiss@uni-mainz.de
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D18812

MFC r329370, r330239: Rationalize license text on Linuxolator files

Many licenses on Linuxolator files contained small variations from the
standard FreeBSD license text. To avoid license proliferation switch to
the standard 2-clause FreeBSD license for those files where I have
permission from each of the listed copyright holders.

Approved by: dchagin, kan, marcel, rdivacky, sos
Sponsored by: The FreeBSD Foundation

MFC r315957:

Implement Linux mincore() system call.
This is necessary for the upcoming drm-next.

MFC r315505:

Implement getrandom() syscall.
Note. GRND_RANDOM option is not supported for now.

MFC r314782:

Add UNIMPLEMENTED() placeholder macro for
the syscalls that are not implemented in Linux kernel itself.
Cleanup DUMMY() macros.

Approved by: trasz

MFC r313769:

Fix definition of linux64 ptrace syscall.

Relnotes: yes
Sponsored by: DARPA, AFRL

MFC r314295:

Implement timerfd family syscalls.

MFC r313940:

Implement rt_tgsigqueueinfo system call used by glibc for pthread_sigqueue(3).

MFC r314219
Add linux_preadv() and linux_pwritev() syscalls to Linuxulator.

Approved by: dchagin

MFC r313284:

Update syscall.master to 4.10-rc6. Also fix comments, a typo,
and wrong numbering for a few unimplemented syscalls.

For 32-bit Linuxulator, socketcall() syscall was historically
the entry point for the sockets API. Starting in Linux 4.3, direct
syscalls are provided for the sockets API. Enable it.

The initial version of patch was provided by trasz@ and extended by me.

MFC r313285:

Regen after r313284.

MFC r313684:

Fix r313284.

Members of the syscall argument structures are padded to a word size. So,
for COMPAT_LINUX32 we should convert user supplied system call arguments
which is 32-bit in that case to the array of register_t.

MFC r313912:

Finish r313684.

Convert linux_recv(), linux_send() and linux_accept() system call arguments
to the register_t type too.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove unneeded includes of opt_kdtrace.h.

As of r258541, KDTRACE_HOOKS is defined in opt_global.h, so opt_kdtrace.h
is not needed when defining SDT(9) probes.

Implement Linux specific syncfs() system call.

Implement recvmmsg() and sendmmsg() system calls.

Implement epoll_pwait() system call.

Add utimensat() system call.

The patch developed by Jilles Tjoelker and Andrew Wilcox and
adopted for lemul branch by me.

Add preliminary fallocate system call implementation
to emulate posix_fallocate() function.

Differential Revision: https://reviews.freebsd.org/D1523
Reviewed by: emaste

Implement ppoll() system call.

Differential Revision: https://reviews.freebsd.org/D1105
Reviewed by: trasz

Implement eventfd system call.

Differential Revision: https://reviews.freebsd.org/D1094
In collaboration with: Jilles Tjoelker

Implement epoll family system calls. This is a tiny wrapper
around kqueue() to implement epoll subset of functionality.
The kqueue user data are 32bit on i386 which is not enough for
epoll user data, so we keep user data in the proc emuldata.

Initial patch developed by rdivacky@ in 2007, then extended
by Yuri Victorovich @ r255672 and finished by me
in collaboration with mjg@ and jillies@.

Differential Revision: https://reviews.freebsd.org/D1092

Add preliminary support for x86-64 Linux binaries.

Differential Revision: https://reviews.freebsd.org/D1076