linux: adjust ordering of Linux auxv and add dummy AT_HWCAP2

This should be a no-op; the purpose of this is to reduce
a spurious difference between Linuxulator and Linux, to make
debugging core dump

linux: adjust ordering of Linux auxv and add dummy AT_HWCAP2

This should be a no-op; the purpose of this is to reduce
a spurious difference between Linuxulator and Linux, to make
debugging core dumps slightly easier.

Note that AT_HWCAP2 we pass to Linux binaries is always 0,
instead of being equal to 'cpu_feature2'. This matches what
I've observed under Ubuntu Focal VM.

Reviewed By: chuck, dchagin
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D29609

(cherry picked from commit ca6e1fa3ce87f56847633530cb94a6fb63405680)

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Rename linux_set_upcall_kse() to linux_set_upcall().

This matches the rename of cpu_set_upcall_kse() in
5c2cf818454375536fda522ba83cf67c50929e6b.

Sponsored by: DARPA

(cherry picked from commit 3b5

Rename linux_set_upcall_kse() to linux_set_upcall().

This matches the rename of cpu_set_upcall_kse() in
5c2cf818454375536fda522ba83cf67c50929e6b.

Sponsored by: DARPA

(cherry picked from commit 3b57ddb029daf225a8385dade491019269da82e8)

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linux: mute the "unsupported prctl option 23" warnings

Make the PR_CAPBSET_READ prctl(2) return EINVAL without logging
any warnings; this is way too noisy with Focal.

Sponsored by: The FreeBSD Foun

linux: mute the "unsupported prctl option 23" warnings

Make the PR_CAPBSET_READ prctl(2) return EINVAL without logging
any warnings; this is way too noisy with Focal.

Sponsored by: The FreeBSD Foundation

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linux(4) prctl(2): Implement PR_[GS]ET_DUMPABLE

Proxy the flag to the roughly analogous FreeBSD procctl 'TRACE'.

TRACE-disabled processes are not coredumped, and Linux !DUMPABLE processes
can not b

linux(4) prctl(2): Implement PR_[GS]ET_DUMPABLE

Proxy the flag to the roughly analogous FreeBSD procctl 'TRACE'.

TRACE-disabled processes are not coredumped, and Linux !DUMPABLE processes
can not be ptraced. There are some additional semantics around ownership of
files in the /proc/[pid] pseudo-filesystem, which we do not attempt to
emulate correctly at this time.

Reviewed by: markj (earlier version)
Differential Revision: https://reviews.freebsd.org/D27015

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linux(4): Add missing clone(2) flags

Further improve prctl(2) debug.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26916

Improve prctl(2) debug.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26899

Make linux getrlimit(2) and prlimit(2) return something reasonable
for linux-specific limits. Fixes prlimit (util-linux-2.31.1-0.4ubuntu3.7).

Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: Th

Make linux getrlimit(2) and prlimit(2) return something reasonable
for linux-specific limits. Fixes prlimit (util-linux-2.31.1-0.4ubuntu3.7).

Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26777

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

linuxulator: Map scheduler priorities to Linux priorities.

On Linux the valid range of priorities for the SCHED_FIFO and SCHED_RR
scheduling policies is [1,99]. For SCHED_OTHER the single valid pri

linuxulator: Map scheduler priorities to Linux priorities.

On Linux the valid range of priorities for the SCHED_FIFO and SCHED_RR
scheduling policies is [1,99]. For SCHED_OTHER the single valid priority is
0. On FreeBSD it is [0,31] for all policies. Programs are supposed to
query the valid range using sched_get_priority_(min|max), but of course some
programs assume the Linux values are valid.

This commit adds a tunable compat.linux.map_sched_prio. When enabled
sched_get_priority_(min|max) return the Linux values and sched_setscheduler
and sched_(get|set)param translate between FreeBSD and Linux values.

Because there are more Linux levels than FreeBSD levels, multiple Linux
levels map to a single FreeBSD level, which means pre-emption might not
happen as it does on Linux, so the tunable allows to disable this behaviour.
It is enabled by default because I think it is unlikely that anyone runs
real-time software under Linux emulation on FreeBSD that critically relies
on correct pre-emption.

This fixes FMOD, a commercial sound library used by several games.

PR: 240043
Tested by: Alex S <[email protected]>
Reviewed by: dchagin
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D23790

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Implement Linux syslog(2) syscall; just enough to make Linux dmesg(8)
utility work.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22465

Implement PTRACE_O_TRACESYSGOOD. This makes Linux strace(1) work.

Reviewed by: dchagin
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20

Implement PTRACE_O_TRACESYSGOOD. This makes Linux strace(1) work.

Reviewed by: dchagin
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20200

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Linuxulator depends on a fundamental kernel settings such as SMP. Many
of them listed in opt_global.h which is not generated while building
modules outside of a kernel and such modules never match re

Linuxulator depends on a fundamental kernel settings such as SMP. Many
of them listed in opt_global.h which is not generated while building
modules outside of a kernel and such modules never match real cofigured
kernel.

So, we should prevent our users from building obviously defective modules.

Therefore, remove the root cause of the building of modules outside of a
kernel - the possibility of building modules with DEBUG or KTR flags.
And remove all of DEBUG printfs as it is incomplete and in threaded
programms not informative, also a half of system call does not have DEBUG
printf. For debuging Linux programms we have dtrace, ktr and ktrace ability.

PR: 222861
Reviewed by: trasz
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D20178

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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 stan

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: rdivacky, marcel
MFC after: 1 week
Sponsored by: The FreeBSD Foundation

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sys/compat: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - er

sys/compat: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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

MFC after: 1 month

Right clock defines specified in linux_timer.h.
Get rid of spirious clock defines from linux_misc.h.

MFC after: 1 week

More complete implementation of /proc/self/limits.
Fix the way the code accesses process limits struct - pointed out by mjg@.

PR: 207386
Reviewed by: no objection form des@
MFC after: 3 weeks

Add utimensat() system call.

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

Put the correct value for the abi_nfdbits parameter of kern_select() for
all supported Linuxulators.

Differential Revision: https://reviews.freebsd.org/D1093
Reviewed by: trasz

Add AT_RANDOM and AT_EXECFN auxiliary vector entries which are used by
glibc. At list since glibc version 2.16 using AT_RANDOM is mandatory.

Differential Revision: https://reviews.freebsd.org/D1080

Introduce a new module linux_common.ko which is intended for the
following primary purposes:

1. Remove the dependency of linsysfs and linprocfs modules from linux.ko,
which will be architecture spec

Introduce a new module linux_common.ko which is intended for the
following primary purposes:

1. Remove the dependency of linsysfs and linprocfs modules from linux.ko,
which will be architecture specific on amd64.

2. Incorporate into linux_common.ko general code for platforms on which
we'll support two Linuxulator modules (for both instruction set - 32 & 64 bit).

3. Move malloc(9) declaration to linux_common.ko, to enable getting memory
usage statistics properly.

Currently linux_common.ko incorporates a code from linux_mib.c and linux_util.c
and linprocfs, linsysfs and linux kernel modules depend on linux_common.ko.

Temporarily remove dtrace garbage from linux_mib.c and linux_util.c

Differential Revision: https://reviews.freebsd.org/D1072
In collaboration with: Vassilis Laganakos.

Reviewed by: trasz

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Put linux_platform into the vdso to avoid copying it onto the stack at
every exec.

Differential Revision: https://reviews.freebsd.org/D1062
Reviewed by: trasz

Implement vdso - virtual dynamic shared object. Through vdso Linux
exposes functions from kernel with proper DWARF CFI information so that
it becomes easier to unwind through them.
Using vdso is a ma

Implement vdso - virtual dynamic shared object. Through vdso Linux
exposes functions from kernel with proper DWARF CFI information so that
it becomes easier to unwind through them.
Using vdso is a mandatory for a thread cancelation && cleanup
on a modern glibc.

Differential Revision: https://reviews.freebsd.org/D1060

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Implement prlimit64() system call.

Differential Revision: https://reviews.freebsd.org/D1050
Reviewed by: emaste, trasz