t_pc
fsip->fsi_pc = (uintptr_t)thr.t_pc;
mdb_printf("PC: %a\n", t.t_pc);
t->t_pc = 0;
t->t_pc = (uintptr_t)_sys_rtt;
tp->t_pc = (uintptr_t)mp_startup_boot;
tp->t_pc = (uintptr_t)mp_startup_hotplug;
vgc.user_regs.rip = tp->t_pc;
t->t_pc = (uintptr_t)thread_start;
t->t_pc = (uintptr_t)thread_start - 8;
tp->t_pc = (uintptr_t)slave_startup - 8;
tp->t_pc = (uintptr_t)idle - 8;