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

Another attempt at resolving CID 1305629. The test of cmd == -1
may make Coverity think that other negative values of cmd (used
as an index) are possible. Testing < 0 is a more common idiom
in any case.

Reported by: Coverity
CID: 1305629

Revert r299584:
Mark usage() as __dead2 so that Coverity doesn't think that execution
continues after the call and uses a negative array subscript.

Requested by: bde

Mark usage() as __dead2 so that Coverity doesn't think that execution
continues after the call and uses a negative array subscript.

Reported by: Coverity
CID: 1305629

META MODE: Update dependencies with 'the-lot' and add missing directories.

This is not properly respecting WITHOUT or ARCH dependencies in target/.
Doing so requires a massive effort to rework targets/ to do so. A
better approach will be to either include the SUBDIR Makefiles directly
and map to DIRDEPS or just dynamically lookup the SUBDIR. These lose
the benefit of having a userland/lib, userland/libexec, etc, though and
results in a massive package. The current implementation of targets/ is
very unmaintainable.

Currently rescue/rescue and sys/modules are still not connected.

Sponsored by: EMC / Isilon Storage Division

Add example for upcoming aarch64/arm64 targets.

If no arguments are passed to a subcommand that requires arguments,
error out before we deref a null pointer in the check for max length.

Thanks to otis in IRC for the bug report.

MFC after: 3 days

Check for invalid length or more than max length for the interpreter, instead
of the validity of the string pointer holding the interpreter.

Submitted by: sson
Reviewed by: dim
MFC after: 3 days

Move the explanation for examples before the example itself. Add
numerous QEMU examples and explanations supplied by sbruno, with thanks
to Ingo Schwarze for help with the mdoc markup. Code, text, testing,
proofreading, cinematography, stunts, and the haunting theme song
supplied by sbruno.

Submitted by: sbruno
Reviewed by: sbruno
MFC after: 1 week

mdoc: kill EOL whitespace.

mdoc: use display block in the beginning of the EXAMPLES section.

More mdoc/spelling/grammar cleanup.

Quick mdoc/whitespace/spelling pass, this needs some more work.

Add Stacey Son's binary activation patches that allow remapping of
execution to a emumation program via parsing of ELF header information.

With this kernel module and userland tool, poudriere is able to build
ports packages via the QEMU userland tools (or another emulator program)
in a different architecture chroot, e.g. TARGET=mips TARGET_ARCH=mips

I'm not connecting this to GENERIC for obvious reasons, but this should
allow the kernel module to be built by default and enable the building
of the userland tool (which automatically loads the kernel module).

Submitted by: sson@
Reviewed by: jhb@