I've put a copy of Some unofficial patches contributed by Toru
Nishimura	in:
	ftp.netbsd.org:~ftp/pub/mips/unofficial-patches/nisimura-patch-1

This patch to the mips1 locore adds some neat stuff, including:

 * a change to the exception-hanlding locore glue to vector syscall
   traps directly to a syscall handler, rather than going through the
   general-purpose exception hanlder in trap.c.
 * a port of the "mdb" miniqdebugger
 * changes that are intended to start toward eliminating the
   double-mapped kernel stack.

 * other changes that I've forgotten.

I haven't yet had time to review these and fold them into the tree.
I'd appreciate any feedback; as may Toru Nisimura.