Cleanup and clarify the ELFSIZE mess:

We now have 2 variables automatically set in elf_machdep.h:

ARCH_ELFSIZE: the size for userland binaries
KERN_ELFSIZE: the size for the kernel binaries

Cleanup and clarify the ELFSIZE mess:

We now have 2 variables automatically set in elf_machdep.h:

ARCH_ELFSIZE: the size for userland binaries
KERN_ELFSIZE: the size for the kernel binaries

DB_ELFSIZE has been deleted and KERN_ELFSIZE should have always the
same values DB_ELFSIZE used to have.

In sys/exec_elf.h, if ELFSIZE is not set, it is set to KERN_ELFSIZE
for the kernel and ARCH_ELFSIZE for userland. These defaults should
eliminate the need for most manual ELFSIZE setting.

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Don't enable DB_MACHINE_COMMANDS on crash(8) (i.e. !defined(_KERNEL) case).
No easy way to switch sun3 and sun3x at run time for now.

Briefly tested by "build.sh -U -m sun3 build".

merge ktrace-lwp.

Remove declarations for db_read_bytes() and db_write_bytes().
They are in <ddb/db_access.h>.

de-__P, remove register, ansify, b* -> mem*, u_int*_t -> uint*_t.

Nuke local extern label_t *db_recover; it's now in <ddb/db_extern.h>

Remove unneeded declarations of the db_machine_init() function. The
ARM ports are the only ones that actually have one, and it is about
to change.

vm_offset_t -> db_addr_t

switch sun3 to ELF. highlight include:
add "%" prefix to register names in assembly code.
change assembly functions to return values in %a0 instead of %d0.
C symbols no longer prepend an underscore,

switch sun3 to ELF. highlight include:
add "%" prefix to register names in assembly code.
change assembly functions to return values in %a0 instead of %d0.
C symbols no longer prepend an underscore, adjust assembly code for this.
32-bit values are now 32-bit aligned instead of 16-bit aligned,
adjust structure packing and padding to override this where necessary.
make EXEC_ELF std, make EXEC_AOUT and COMPAT_AOUT_M68K optional.
use the MI loadfile() instead of several home-grown versions.

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Change ddb_init() for a.out to provision for kernels which are not booted by
the current 'bootblock' method, like the Shark, which preloads and preformats
the symbol table right in the boot code.

Add declaration for db_recover. Also fix copyright.

Make this compile with -Werror -Wall -Wstrict-prototypes
(finally! yea!) Also get rid of __BROKEN_INDIRECT_CONFIG

Add ddb commands: machine {abort|halt|reboot}

Lots of changes. Fairly stable now.

new RCS ID format.

sun3 port works under NetBSD-current now. rcsids probably fucked

stub

fixed problem that caused two consecutive segments to be using the same
pmeg unknowingly. still too many printfs, not sure how many are actualy
in the machine dependent code. reaches cpu_startup()

fixed problem that caused two consecutive segments to be using the same
pmeg unknowingly. still too many printfs, not sure how many are actualy
in the machine dependent code. reaches cpu_startup() where it stops
deliberately. next project: autoconfig(), maybe kgdb

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various changes