libkldelf: add see_local parameter to elf_lookup_symbol

This gives the function the ability to return only global symbols.

Sponsored by: Juniper Networks, Inc.
Reviewed by: markj
Differential Revis

libkldelf: add see_local parameter to elf_lookup_symbol

This gives the function the ability to return only global symbols.

Sponsored by: Juniper Networks, Inc.
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D47206

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libkldelf: add elf_lookup_symbol function

The elf_lookup_symbol function looks up the symbol with a given symbol
name. A pointer to the GElf_Sym of the symbol is returned if the symbol
exists in the

libkldelf: add elf_lookup_symbol function

The elf_lookup_symbol function looks up the symbol with a given symbol
name. A pointer to the GElf_Sym of the symbol is returned if the symbol
exists in the opened ELF file.

Sponsored by: Juniper Networks, Inc.
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D46764

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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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