sgimips: stand: Switch to libsa/getopt, NFCI

ELF2ECOFF -> MIPS_ELF2ECOFF

Use elf2ecoff(1) rather than objcopy(1) to generat ecoff for old machines.

objcopy(1) was used instead of elf2ecoff(1) since Makefile rev 1.9:
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/sgimips/stand/boot/Makefile#rev1.9
but it looks ELF binaries generated by recent binutils are too complicated
to convert them to ecoff for old machines by objcopy(1).

Reported by Naruaki Etomi in PR port-sgimips/53519.
Should be pulled up to at least netbsd-8.

branches: 1.19.30; 1.19.48; 1.19.54; 1.19.56;
Make sure that sgimips64 can build the O32 bootloaders

Merge forward matt-nb5-mips64
Adapt to new interrupt/spl framework
Deal with arcbios calls being O32 and kernels being N32/N64.
Need to save/restore T8 across arcbios calls.

branches: 1.17.2; 1.17.4;
Introduce .WAIT into the cleandir rule for blasting the libsa/libkern/etc.
trees, because it can race with the libsa/libkern/etc. makefiles' own
cleandir rules. I think I've found all of the uses of the offending idiom...
Closes PR 43360.

branches: 1.16.2; 1.16.4;
Fix typo (missing -)

Merge from matt-nb5-mips64
Merge mips-specific arch files.

- use <bsd.klinks.mk> to create MD include dir symlinks
- make sure to remove lib subdirs on clean and distclean target

branches: 1.13.4; 1.13.12; 1.13.18; 1.13.22;
- preserver non-stripped boot binaries
- use ${.TARGET}

branches: 1.12.50; 1.12.70; 1.12.74;
merge ktrace-lwp.

Link ip2xboot as OMAGIC by -N option for ld(1) as well as ip3xboot.
Tested by sekiya.

branches: 1.10.2;
Link ip3xboot as OMAGIC by -N option for ld(1) so that the firmware on O2
can load it again.

branches: 1.9.2;
Replace elf2ecoff with objcopy for ECOFF bootloader creation. Fix a comment
typo while we're here.

branches: 1.8.8; 1.8.10;
bootloader targets have changed, which confused the install rules.

More bootloader changes:

* if loading from cdrom, assume we're performing an install and
fix up bootpath/kernel to load the proper install kernel.
* maximum filename length in volume header is eight characters.
Change boot.elf to ip2xboot, boot.ip32 to ip3xboot, and boot
to aoutboot (which matches kernel naming scheme as well).

Add getopt.c

branches: 1.5.2;
also create boot.ip32 with the entry point set to the IP32 load address

from Chris Sekiya

Fix PR port-sgimips/17568: the PROM on early Indigo2 machines did not like
the ECOFF version of boot produced by `objcopy'. Using elf2ecoff make it
work, so use that instead. Also, don't bother stripping the bootblocks on
install (as that confuses strip, at least for the ECOFF one, and since the
build already strips them).

branches: 1.3.2; 1.3.10; 1.3.12;
- Clean up the bootloader Makefiles somewhat.
- Build an ECOFF version of the bootloader as "boot". As a temporary
measure (due to a bug in libbfd which has not yet been fixed, but
for which a work-around exists as a patch), install and ELF version
of the bootload as well as "boot.elf". "boot.elf" will go away once
the toolchain issue is resolved.

- Adjust bootinfo to work sanely in an ARCS world, and pass some
info along to the kernel (currently just the symbol table info).
- Don't bother with the startprog dance; we don't need to do anything
special, here, so just call the entry point directly.
- A bunch of random cleanup.

Initial cut at a bootloader for NetBSD/sgimips, by Michael Hitch.