trap.c:261: 	tos->kcycles += t - up->kentry;
trap.c:262: 	tos->pcycles = up->pcycles;
trap.c:263: 	tos->pid = up->pid;
trap.c:268: 	tos->core = mp->machno;	
trap.c:269: 	tos->nixtype = mp->nixtype;