usr.bin: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

procstat auxv: widen COMM column to MAXCOMLEN

For reasons unknown, procstat subcommands typically display the command
in a 16+overflow column format. However, the command may be up to
MAXCOMLEN (19) characters long causing the column to spill into the next
one. Since there's plenty of room in the auxv case, bump the column
width up to 19 to avoid this issue. While this is a format change 1)
users who want to parse the data should use libxo output and 2) this
makes it possible to parse reliably with cut.

Reviewed by: markj
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D42202

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

procstat(1): print AT_USRSTACKBASE and AT_USRSTACKLIM

Reviewed by: brooks, imp (previous version)
Discussed with: markj
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D36540

Pass vdso address to userspace

Reviewed by: emaste
Discussed with: jrtc27
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 month
Differential revision: https://reviews.freebsd.org/D32960

procstat auxv: print out FXRNG

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Consistently use __FBSDID("FreeBSD") for ids in usr.bin/procstat.

Submitted by: Juraj Lutter <juraj@lutter.sk>
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D26568

Add procstat support for AT_ flags added in r359988.

This includes argc, argv, envc, envv, and ps_strings.

Reviewed by: kib
Obtained from: CheriBSD
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D24407

Add AT_BSDFLAGS auxv entry.

The intent is to provide bsd-specific flags relevant to interpreter
and C runtime. I did not want to reuse AT_FLAGS which is common ELF
auxv entry.

Use bsdflags to report kernel support for sigfastblock(2). This
allows rtld and libthr to safely infer the syscall presence without
SIGSYS. The tunable kern.elf{32,64}.sigfastblock blocks reporting.

Tested by: pho
Disscussed with: cem, emaste, jilles
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D12773

procstat: Recognize HWCAP and HWCAP2 with auxv command

The two most recent additions to the elf auxiliary vector are
HWCAP and HWCAP2 which describe platform specific cpu capabilities.

Make procstat recognize these fields so that they aren't displayed
as UNKNOWN.

Reviewed by: trociny, markj
Approved by: markj (mentor)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D20582

Teach procstat -x about the AT_EHDRFLAGS ELF auxiliary vector.

Submitted by: Shawn Webb <lattera@gmail.com>
Reviewed by: brooks
Obtained from: HardenedBSD (bb71e9889d1362df01c2e5162e84cd7a4fc029c8)
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D17067

various: general 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.

No functional change intended.

Switch procstat from subcommand flags to verbs

- Use an enumerated value instead of separate flags for commands
- Look for a verb if no command flag is set
- Lookup the "xocontainer" value based on the command
- Document the new command verbs in the man-page

Submitted by: kdrakehp@zoho.com
Differential Revision: https://reviews.freebsd.org/D10916

Fix inverted output re: stack protection no-execute flag in procstat(1)

PR: 196110
Submitted by: Joerg Pernfuss <code.jpe@gmail.com>
Approved by: bapt (mentor)
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D3576

Introduce libxo to procstat(1)

Reviewed by: rodrigc, bapt
Approved by: marcel (mentor)
Relnotes: yes
Sponsored by: ScaleEngine Inc.
Differential Revision: https://reviews.freebsd.org/D2446

Use libprocstat(3) to retrieve ELF auxiliary vector.

MFC after: 1 month

Handle AT_TIMEKEEP in procstat(1) -x [1]. Remove the AT_COUNT switch
case, since AT_COUNT is not an aux vector, it is the counter of total
number of defined vectors.

PR: bin/171662 [1]
MFC after: 1 week

Always return 0 if the sysctl failed.

This fixes the bug: when procstat -xa was run and the sysctl for a
process returned ESRCH or EPERM, for this process procstat output the
result collected for the previous successful process.

Make 64-bit procstat output ELF auxiliary vectors for 32-bit processes.

Reviewed by: kib
MFC after: 1 week

Don't output a warning if kern.proc.auxv sysctl has returned EPERM.
After r228288 this is rather a normal situation.

MFC after: 1 week

Cast a_val on printing. This fixes build on mips.

Make proctstat -x output more readable.

This also fixes the issue, spotted by mdf, with values that were
printed as decimal and had hex prefixes.

Discussed with: kib, rwatson
MFC after: 2 weeks

Fix build, hopefully.

Reviewed by: kib

Add new options, -e and -x, to display process environment variables
and ELF auxiliary vectors.

MFC after: 2 weeks