tests/kernel: New test for setjmp(9)/longjmp(9).

PR port-riscv/59304: kernel longjmp(9) fails to make setjmp(9) return 1
PR port-hppa/59305: kernel longjmp(9) fails to make setjmp(9) return 1
PR port-powerpc/59306: kernel longjmp(9) fails to make setjmp(9) return 1
PR port-sparc/59307: kernel longjmp(9) fails to make setjmp(9) return 1
PR port-vax/59308: kernel longjmp(9) fails to make setjmp(9) return 1

branches: 1.19.10;
Fix lists for RUMP-less builds

Overhaul the API used to fetch and store individual memory cells in
userspace. The old fetch(9) and store(9) APIs (fubyte(), fuword(),
subyte(), suword(), etc.) are retired and replaced with new ufetch(9)
and ustore(9) APIs that can return proper error codes, etc. and are
implemented consistently across all platforms. The interrupt-safe
variants are no longer supported (and several of the existing attempts
at fuswintr(), etc. were buggy and not actually interrupt-safe).

Also augmement the ucas(9) API, making it consistently available on
all plaforms, supporting uniprocessor and multiprocessor systems, even
those that do not have CAS or LL/SC primitives.

Welcome to NetBSD 8.99.37.

Add KCOV - kernel code coverage tracing device

The KCOV driver implements collection of code coverage inside the kernel.
It can be enabled on a per process basis from userland, allowing the kernel
program counter to be collected during syscalls triggered by the same
process.

The device is oriented towards kernel fuzzers, in particular syzkaller.

Currently the only supported coverage type is -fsanitize-coverage=trace-pc.

The KCOV driver was initially developed in Linux. A driver based on the
same concept was then implemented in FreeBSD and OpenBSD.

Documentation is borrowed from OpenBSD and ATF tests from FreeBSD.

This patch has been prepared by Siddharth Muralee, improved by <maxv>
and polished by myself before importing into the mainline tree.

All ATF tests pass.

threadpool needs rump

PR/53908: Alex Raschi: Test that require modules belong in modules; move the
threadpool test from kernel to modules.

Add threadpool(9), an abstraction that provides shared pools of kernel
threads running at specific priorities, with support for unbound pools
and per-cpu pools.

Written by riastradh@, and based on the May 2014 draft, with a few changes
by me:
- Working on the assumption that a relative few priorities will actually
be used, reduce the memory footprint by using linked lists, rather than
2 large (and mostly empty) tables. The performance impact is essentially
nil, since these lists are consulted only when pools are created (and
destroyed, for DIAGNOSTIC checks), and the lists will have at most 225
entries.
- Make threadpool job object, which the caller must allocate storage for,
really opaque.
- Use typedefs for the threadpool types, to reduce the verbosity of the
API somewhat.
- Fix a bunch of pool / worker thread / job object lifecycle bugs.

Also include an ATF unit test, written by me, that exercises the basics
of the API by loading a kernel module that exposes several sysctls that
allow the ATF test script to create and destroy threadpools, schedule a
basic job, and verify that it ran.

And thus NetBSD 8.99.29 has arrived.

branches: 1.13.2; 1.13.4;
PR 52864: add a test for this bug, from sevan@

Autogenerate Kyuafiles next to Atffiles when MKKYUA is set.

This is suboptimal: the current high-level definitions of test programs
in the Makefiles do not carry enough information to support all the
features of Kyuafiles. For example, it is not possible to register test
programs that do *not* use the ATF libraries, which is something that
has been frequently requested around here; nor it is possible to attach
arbitrary metadata to test programs from the Makefile, which is handy
particularly for ATF-less test programs.

For these reasons, consider this a transitional step.

Note that, with this change, you should now be able to use the 'kyua'
tool to run the tests in /usr/tests.

Add a new "debug" set that gets built when ${MKDEBUG} is set. On evbarm:
-rw-r--r-- 1 root src 35806068 Jan 16 10:47 base.tgz
-rw-r--r-- 1 root src 57374069 Jan 16 10:48 comp.tgz
-rw-r--r-- 1 root src 101286193 Jan 16 10:49 debug.tgz
...
This allows always building the debugging code and libraries but not
installing it (although now it is placed in the default sets if ${MKDEBUG}
is set

branches: 1.10.2;
adjust for MKRUMP = no

Move module related debug entries to module.mi list to fix MKDEBUG=yes
and MKKMOD=no builds. Add missing k_helper3.debug line.

The k_helper3 module no longer gets installed in its own subdirectory.

Add a helper program that loads a module and returns the errno from modctl(8).

XXX: As noted on tech-kern@, the syscall should be modified to fail
consistently with a given predefined errno on non-MODULAR kernels.

Add a test to ensure that PAGE_SIZE is available in kernel modules.
This test reproduces the error condition in PR port-macppc/46041 and
therefore it is an xfail in this particular platform.

branches: 1.5.6; 1.5.8;
The incredible travels of Seth List.

Add a new atf test-case to check that recursive module calls actually work.

fix a bunch of issues with MKATF=no.

Move ./usr/tests/modules/Atffile from tests/mi to tests/module.mi.
This should get us building for evbppc again, which doesn't do modules.

Farm out module tests to module.mi, to accomodate evbppc which
currently does not build modules or module tests.