Tim Kelly <hockey@dialectronics.com> writes:

> The biggest obstacle, as I see it, is that without support for MP in the
> macppc ddb, it is very difficult to get critical stuff like a stack
> trace and the registers from the hung CPU. 

Have a look at sys/arch/i386/i386/db_interface.c, the "cpu" subcommand
there, and the db_mach_cpu() funtction in that file that implements
it. It should be straightforward, and quite useful, to port that over
to the powerpc db_interface.c.

        - Nathan