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gcore: Trim stale bits from elf32core.c.

These should have been removed in
d95657a1a758e8d993a0eb92259f8c860a309207.

Reviewed by: markj
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D35748

gcore: Use PT_GETREGSET for NT_THRMISC and NT_PTLWPINFO.

This avoids the need for dealing with converting lwpinfo for alternate
ABIs in gcore itself.

Reviewed by: markj
MFC after: 2 weeks
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D35667

gcore: Use PT_GETREGSET to fetch NT_PRSTATUS and NT_FPREGSET.

Add a elf_putregnote() helper to build the ELF note for a register
set. Once nice result of this approach is that this reuses the
kernel's support for generating 32-bit register sets for 32-bit
processes avoiding the need to duplicate that logic in elf32core.c.

Reviewed by: markj
Sponsored by: University of Cambridge, Google, Inc.
Differential Revision: https://reviews.freebsd.org/D34447

gcore: Add powerpc64 32-bit gcore support

Summary: Add the necessary bits for taking 32-bit gcore coredumps on powerpc64.

Reviewed by: luporl
Differential Revision: https://reviews.freebsd.org/D21954

gcore: Add aarch64 32-bit core support

Summary: Add trivial 32-bit arm cores on aarch64 support for gcore. This
doesn't handle fpregs.

Reviewed by: #arm, andrew
Sponsored by: Juniper Networks, Inc
Differential Revision: https://reviews.freebsd.org/D21947

Store a 32-bit PT_LWPINFO struct for 32-bit process core dumps.

Process core notes for a 32-bit process running on a 64-bit host need to
use 32-bit structures so that the note layout matches the layout of notes
of a core dump of a 32-bit process under a 32-bit kernel.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D11407

Move the 32-bit compatible procfs types from freebsd32.h to <sys/procfs.h>
and export them to userland.
- Define __HAVE_REG32 on platforms that define a reg32 structure and check
for this in <sys/procfs.h> to control when to export prstatus32, etc.
- Add prstatus32_t and prpsinfo32_t typedefs for the 32-bit structures.
libbfd looks for these types, and having them fixes 'gcore' in gdb of a
32-bit process on a 64-bit platform.
- Use the structure definitions from <sys/procfs.h> in gcore's elf32 core
dump code instead of duplicating the definitions.

Differential Revision: https://reviews.freebsd.org/D2142
Reviewed by: kib, nathanw (powerpc bits)
MFC after: 1 week

Create 32-bit core files for 32-bit processes on 64-bit machines.
The 64-bit machine supported right now is amd64, but it's not too
hard to add powerpc64.

Obtained from: Juniper Networks, Inc.