ddb_break_trap
int ddb_break_trap(int, db_regs_t *);
ddb_break_trap(T_KDB_BREAK, (db_regs_t*)frame);
ddb_break_trap(T_KDB_TRACE, (db_regs_t*)frame);
ddb_break_trap(T_KDB_BREAK, (db_regs_t*)frame);