kldxref: handle modules with md_cval at the end of allocated sections

Attempting to retrieve an md_cval string from a kernel module with
kldxref would throw a offset error for modules created using

kldxref: handle modules with md_cval at the end of allocated sections

Attempting to retrieve an md_cval string from a kernel module with
kldxref would throw a offset error for modules created using lld, since
this value would be placed at the end of all allocated sections.

Add an ef_read_seg_string method to the ef interface, to allow reading
strings of varying size without attempting to read beyond the segment's
bounds.

PR: 224875
Submitted by: Mitchell Horne <mhorne063@gmail.com>
Reviewed by: cem, kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D13923

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Merge ^/head r325842 through r325998.

spdx: initial adoption of licensing ID tags.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensou

spdx: initial adoption of licensing ID tags.

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.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Initially, only tag files that use BSD 4-Clause "Original" license.

RelNotes: yes
Differential Revision: https://reviews.freebsd.org/D13133

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MFhead @ r304815

Merge ^/head r304537 through r304699.

Use roundup2() from sys/param.h.

Use NULL instead of 0 for pointers.

MFC after: 2 weeks.

MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

MFH @r292599

This includes the pluggable TCP framework and other chnages to the
netstack to track for VNET stability.

Security: The FreeBSD Foundation

Augment kldxref to find the new MODULE_PNP_INFO records now in
modules, simplify them into a more normal form and write them to
linker.hints.

Differential Review: https://reviews.freebsd.org/D3461

Merge from head

Sponsored by: Gandi.net

Merge from head

Sync up with head up to r289211.

Merge ^/head r288457 through r288830.

Remerge as previous one was broken

Add debug file extension to kldxref(8) after r288176

After r288176 kernel debug files have the extension .debug. They also
moved to /usr/lib/debug/boot/kernel by default so in the normal case
kldxr

Add debug file extension to kldxref(8) after r288176

After r288176 kernel debug files have the extension .debug. They also
moved to /usr/lib/debug/boot/kernel by default so in the normal case
kldxref does not encounter them. A src.conf(5) setting may be used to
continue installing them in /boot/kernel though, so have kldxref skip
.debug files in addition to .symbols files.

Reported by: fabient
Sponsored by: The FreeBSD Foundation

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Merge sync of head

MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reserve and ignore the a new module metadata type MDT_PNP_INFO for
associating an optional PNP hint table with this module. In the
future, when these are added, these changes will silently ignore the

Reserve and ignore the a new module metadata type MDT_PNP_INFO for
associating an optional PNP hint table with this module. In the
future, when these are added, these changes will silently ignore the
new type they would otherwise warn about. It will always be safe to
ignore this data. Get this into the builds today for some future
proofing.

MFC After: 3 days

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Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

MFhead @ r276594

Merge ^/head r274961 through r276301.

Bump the largest record we can cope with from 1k to 8k. Other users of
the hints file don't have any real limits, and longer records will
need to be written shortly.

Merge head