required. This duplicates the behavour used by DDB in db_stop_at_pc()
Architectures that emulate single step in software (SOFTWARE_SSTEP) don't
clear their temporary breakpoints making it impossible to restart on the
same instruction.
Move platform db_trap callback from arch/mips into ddb as suggested by
jhawk. This callback is used by platform code to manage things like
watchdogs that should be disabled while in ddb. Done as a callback
for processors such as mips that support lots of different systems.
Some of the stuff (e.g., rarpd, bootpd, dhcpd etc., libsa) still will
only support Ethernet. Tcpdump itself should be ok, but libpcap needs
lot of work.
For the detailed change history, look at the commit log entries for
the is-newarp branch.
