Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

ldd: do not use dlopen(RTLD_TRACE) for dso when format is specified

Problem is that rtld cannot reliably access updated environment.
This was made more obvious by bfd4c875a10560aaa2. The application
environment can be in arbitrary state and place, system components
can observe it only during execve(2), or in case of rtld, right after
execve, when environment is still at know location and format.

Instead spawn ld-elf.so.1 in direct exec mode which can correctly read
all inherited updates to the environment.

PR: 259069
Reviewed by: arichardson, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D32464

Fix ldd to work with more ELF files.

- Use libelf to parse ELF data structures and remove code duplication
for ELF32.

- Don't require the OSABI field to be set to the FreeBSD OSABI for
shared libraries. Both AArch64 and RISC-V leave it set to "none"
and instead depend on the ABI tag note. For ldd, this means falling
back to walking the notes in PT_NOTE segments to find the ABI tag
note to determine if an ELF shared library without OSABI set in the
header file is a FreeBSD shared library.

Reviewed by: kib
MFC after: 5 days
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D28342

ldd: Retire aout support

Userland aout support has not been required since FreeBSD 2.x.
If someone needs to use FreeBSD 2 shared libraries they will be best
served by using a FreeBSD 2 ldd, perhaps as part of a jail with a full
FreeBSD 2.x install.

Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27478

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

MFtbemd:

Prefer MACHNE_CPUARCH to MACHINE_ARCH in most contexts where you want
to test of all the CPUs of a given family conform.

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.

Build usr.bin/ with WARNS=6 by default.

Also add some missing $FreeBSD$ to keep svn happy.

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

Tweak the support for using ldd on 32-bit objects a bit further.
Specifically, build a 32-bit /usr/bin/ldd32 on amd64 which handles 32-bit
objects. Since it is a 32-bit binary, it can fork a child process which
can dlopen() a 32-bit shared library. The current 32-bit support in ldd
can't do this because it does the dlopen() from a 64-bit process. In order
to preserve an intuitive interface for users, the ldd binary automatically
execs /usr/bin/ldd32 for 32-bit objects. The end result is that ldd on
amd64 now transparently handles 32-bit shared libraries in addition to
32-bit binaries.

Submitted by: ps (indirectly)

The type of some aout header types changed to uint_32, so now we need
to cast to long before printing. While I'm here, raise WARNS to 6.

Remove GCC-specific flags.

$Id$ -> $FreeBSD$

Make ldd work on alpha.

Add -DFREEBSD_AOUT to CFLAGS to ensure we get the correct definitions
from <link.h>

ldd standalone build, after repository copy.

Touch up the code that implements "ldd -v".

Bring the style of sods.c into better conformance. Add code to
print the contents of each datum being relocated. Correct the logic
that distinguishes between programs, shared libraries, and object
files. Make the entire program "-Wall" clean.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Incorporate John Polstra's sods.c display of the details about the
dynamic linking information in the executable. It's quite extensive.
It's connected to ldd's (new) -v option.

Fixed Makefile per bug report from Julian Stacey. There was an extra DESTDIR
in front of BINDIR definition.

Imported NetBSD's ld for shared libs.