libkldelf: add a private library for kernel/kld-related ELF parsing

The libkldelf library was originally a part of kldxref(8). It exposed
ELF parsing helpers specialized in parsing KLDs and the kern

libkldelf: add a private library for kernel/kld-related ELF parsing

The libkldelf library was originally a part of kldxref(8). It exposed
ELF parsing helpers specialized in parsing KLDs and the kernel
executable. The library can be used to read metadata such as linker_set,
mod_depend, mod_version and PNP match info, and raw data from the ELF.

To promote the reuse of the facilities the ELF parsing code is separated
from kldxref(8) into a new private library.

For now, libkldelf's source files will be compiled into kldxref(8)
directly if kldxref is built during bootstrapping phase. The reason is
linking kldxref(8) against the libkldelf static library has an unwanted
side effect which renders the linker sets inside the libkldelf
implementation empty if the static library is not build by ld -r all the
.o files into a single .o before producing the static library.

Sponsored by: Juniper Networks, Inc.
Reviewed by: markj
Suggested by: jrtc27, markj
Differential Revision: https://reviews.freebsd.org/D46719

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Revert "libkldelf: add a private library for kernel/kld-related ELF parsing"

This reverts commit 0a2cfd653e86ac41c4e6e32a449d133c0ee6d677.

libkldelf: add a private library for kernel/kld-related ELF parsing

The libkldelf library was originally a part of kldxref(8). It exposed
ELF parsing helpers specialized in parsing KLDs and the kern

libkldelf: add a private library for kernel/kld-related ELF parsing

The libkldelf library was originally a part of kldxref(8). It exposed
ELF parsing helpers specialized in parsing KLDs and the kernel
executable. The library can be used to read metadata such as linker_set,
mod_depend, mod_version and PNP match info, and raw data from the ELF.

To promote the reuse of the facilities the ELF parsing code is separated
from kldxref(8) into a new private library.

kldxref(8) is modified to link against the libkldelf library.

Sponsored by: Juniper Networks, Inc.
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D46719

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Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

kldxref: Add arm support

kldxref: Put each ef_CPUARCH.c on its own line to prepare for ef_arm.c

Adding ef_arm.c would push this past 80 columns, so prepare for its
addition by splitting the line up.

kldxref: Make use of libelf to be a portable cross tool

This allows kldxref to operate on kernel objects from any
architecture, not just the native architecture. In particular, this
will permit gen

kldxref: Make use of libelf to be a portable cross tool

This allows kldxref to operate on kernel objects from any
architecture, not just the native architecture. In particular, this
will permit generating linker.hints files as part of a cross-arch
release build.

- elf.c is a new file that includes various wrappers around libelf
including routines to read ELF data structures such as program and
section headers and ELF relocations into the "generic" forms
described in <gelf.h>. This file also provides routines for
converting a linker set into an array of addresses (GElf_Addr)
as well as reading architecture-specific mod_* structures and
converting them into "generic" Gmod_* forms where pointers are
replaced with addresses.

- The various architecture-specific reloc handlers now use GElf_*
types for most values (including GElf_Rel and GElf_Rela for
relocation structures) and use routines from <sys/endian.h> to read
and write target values. A new linker set matches reloc handlers
to specific ELF (class, encoding, machine) tuples.

- The bits of kldxref.c that write out linker.hints now use the
encoding (ELFDATA2[LM]SB) of the first file encountered in a
directory to set the endianness of the output file. Input files
with a different architecture in the same directory are skipped with
a warning. In addition, the initial version record for the file
must be deferred until the first record is finished since the
architecture of the output file is not known until then.

- Various places that used 'sizeof(void *)' throughout now use
'elf_pointer_size()' to determine the size of a pointer in the
target architecture.

Tested by: amd64 binary on both amd64 and i386 /boot/kernel
Reviewed by: imp
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D42966

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Remove $FreeBSD$: one-line sh pattern

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

Merge ^/head r351732 through r352104.

pkgbase: Put a lot of binaries and lib in FreeBSD-runtime

All of them are needed to be able to boot to single user and be able
to repair a existing FreeBSD installation so put them directly into
Fre

pkgbase: Put a lot of binaries and lib in FreeBSD-runtime

All of them are needed to be able to boot to single user and be able
to repair a existing FreeBSD installation so put them directly into
FreeBSD-runtime.

Reviewed by: bapt, gjb
Differential Revision: https://reviews.freebsd.org/D21503

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MFHead@r345275

MFhead@r344786

Merge ^/head r344549 through r344775.

Fix kldxref on PowerPC64

When using kldxref on kernel modules built with clang8 + lld8,
kldxref would be unable to find the modules metadata information,
because PowerPC64 was using the ef_nop.c imp

Fix kldxref on PowerPC64

When using kldxref on kernel modules built with clang8 + lld8,
kldxref would be unable to find the modules metadata information,
because PowerPC64 was using the ef_nop.c implementation of
ef_reloc().

When GNU LD was used, it was also relocating the metadata section of
the .ko file. LLD does not do this, but only generate dynamic
relocations for it. With minor changes, ef_powerpc.c can now work
for PowerPC64 too.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D19370

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Merge sync of head

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

MFhead @ r275911 (also, sort out MK_* flags in BMAKE, etc on this branch)

Merge ^/head r275759 through r275911.

Remove -fno-strict-alias, as it is no longer needed.

Repair some build breakage introduced in r211725 and garbage collect some
code made obsolete in the same commit.

MFtbemd:

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

These are the things that the tinderbox has problems with because it
doesn't use the default CFLAGS which contain -fno-strict-aliasing.

Until the code is cleaned up, just add -fno-strict-aliasing to

These are the things that the tinderbox has problems with because it
doesn't use the default CFLAGS which contain -fno-strict-aliasing.

Until the code is cleaned up, just add -fno-strict-aliasing to the
CFLAGS of these for the tinderboxes' sake, allowing the rest of the
tree to have -Werror enabled again.

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Build shared on PowerPC now that the bug has been found and fixed.

Use NO_SHARED=YES to force a static link.

Pointed out by: ru@