libdtrace: get rid of illumos ifdefs in dt_module_update(), fix dm_file and dm_modid

Because dt_module_update() is highly OS-specific, the ifdefs make it
hard to read and follow what is going on. Also handle dm_modid, and
remove handling of the ".filename" section, since we can easily fetch
the filename from the module's pathname (k_stat->pathname).

Reviewed by: markj
Approved by: markj (mentor)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D39177

libdtrace: Add a missing unlock to an error handler.

Submitted by: Jihyun Yu <yjh0502@gmail.com>
MFC after: 3 days

libdtrace: use calloc(3) instead of malloc(3) when it makes sense.

calloc(3) is faster and occasionally safer than malloc(3) + bzero(3).

In one case, pointed out by Mark[1], this also cleans up a calculation.

Reviewed by: markj [1]
MFC after: 1 week

libdtrace: allow D libraries to declare dependencies on kernel modules

The "depends_on module" pragma can be used to declare a dependency on a
DTrace module, which for kernel probes corresponds to a KLD. Such
dependencies cannot be checked if the KLD is compiled into the kernel.
Therefore, allow a module dependency to be satisfied if either a kernel
module or a KLD with the specified name is loaded.

Differential Revision: https://reviews.freebsd.org/D2653
Reviewed by: gnn, rpaulo
Reported by: gnn

Mechanically convert cddl sun #ifdef's to illumos

Since the upstream for cddl code is now illumos not sun, mechanically
convert all sun #ifdef's to illumos #ifdef's which have been used in all
newer code for some time.

Also do a manual pass to correct the use if #ifdef comments as per style(9)
as well as few uses of #if defined(__FreeBSD__) vs #ifndef illumos.

MFC after: 1 month
Sponsored by: Multiplay

The module load address always needs to be included when setting the dm_*_va
fields of dt_module_t. Previously, this was only done on architectures where
kernel modules have type ET_REL; this change fixes that. As a result, symbol
name resolution in the stack() action now works properly for kernel modules
on i386.

Reported by: Shrikanth Kamath <shrikanth07@gmail.com>
Tested by: Shrikanth Kamath
Discussed with: avg
MFC after: 2 weeks

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

dtrace: correctly map sections to addresses in elf object modules (amd64)

Unlike for modules with dso type, in elf object modules all the sections
have virtual address of zero. So, it is insufficient to add module base
address to section virtual address (as recorded in section header) to
get section address in kernel memory.
Instead, we should apply the same calculations that are performed by
kernel loaders (in boot code and in kernel) when they lay out sections
in memory.
Also, unlike OpenSolaris, the sections are not collapsed into just .text,
.data and .bss by module loaders, so we need to take additional care
about other sections.

Note that in-kernel symbol-to-address mapping worked just fine, e.g. fbt
provider could correctly find the functions, etc. It's only in userland
that the mapping in both direction worked incorrectly, e.g. in stack()
output addresses of functions in kernel modules were not translated to
their names.

Reviewed by: rpaulo
MFC after: 3 weeks

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

* Make this file compile cleanly.
* Use FreeBSD's kld syscalls to get kernel module information instead
of using an object file system like Solaris uses.