1 /* arch/sparc64/kernel/process.c
3 * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 * This file handles the architecture-dependent parts of process handling..
14 #include <linux/errno.h>
15 #include <linux/export.h>
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
20 #include <linux/smp.h>
21 #include <linux/stddef.h>
22 #include <linux/ptrace.h>
23 #include <linux/slab.h>
24 #include <linux/user.h>
25 #include <linux/delay.h>
26 #include <linux/compat.h>
27 #include <linux/tick.h>
28 #include <linux/init.h>
29 #include <linux/cpu.h>
30 #include <linux/elfcore.h>
31 #include <linux/sysrq.h>
32 #include <linux/nmi.h>
34 #include <asm/uaccess.h>
36 #include <asm/pgalloc.h>
37 #include <asm/pgtable.h>
38 #include <asm/processor.h>
39 #include <asm/pstate.h>
41 #include <asm/fpumacro.h>
43 #include <asm/cpudata.h>
44 #include <asm/mmu_context.h>
45 #include <asm/unistd.h>
46 #include <asm/hypervisor.h>
47 #include <asm/syscalls.h>
48 #include <asm/irq_regs.h>
53 static void sparc64_yield(int cpu)
55 if (tlb_type != hypervisor) {
60 clear_thread_flag(TIF_POLLING_NRFLAG);
61 smp_mb__after_clear_bit();
63 while (!need_resched() && !cpu_is_offline(cpu)) {
66 /* Disable interrupts. */
68 "rdpr %%pstate, %0\n\t"
70 "wrpr %0, %%g0, %%pstate"
74 if (!need_resched() && !cpu_is_offline(cpu))
77 /* Re-enable interrupts. */
79 "rdpr %%pstate, %0\n\t"
81 "wrpr %0, %%g0, %%pstate"
86 set_thread_flag(TIF_POLLING_NRFLAG);
89 /* The idle loop on sparc64. */
92 int cpu = smp_processor_id();
94 set_thread_flag(TIF_POLLING_NRFLAG);
97 tick_nohz_idle_enter();
100 while (!need_resched() && !cpu_is_offline(cpu))
104 tick_nohz_idle_exit();
106 #ifdef CONFIG_HOTPLUG_CPU
107 if (cpu_is_offline(cpu)) {
108 sched_preempt_enable_no_resched();
112 schedule_preempt_disabled();
117 static void show_regwindow32(struct pt_regs *regs)
119 struct reg_window32 __user *rw;
120 struct reg_window32 r_w;
123 __asm__ __volatile__ ("flushw");
124 rw = compat_ptr((unsigned)regs->u_regs[14]);
127 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
133 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
134 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
135 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
136 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
137 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
138 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
139 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
140 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
143 #define show_regwindow32(regs) do { } while (0)
146 static void show_regwindow(struct pt_regs *regs)
148 struct reg_window __user *rw;
149 struct reg_window *rwk;
150 struct reg_window r_w;
153 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
154 __asm__ __volatile__ ("flushw");
155 rw = (struct reg_window __user *)
156 (regs->u_regs[14] + STACK_BIAS);
157 rwk = (struct reg_window *)
158 (regs->u_regs[14] + STACK_BIAS);
159 if (!(regs->tstate & TSTATE_PRIV)) {
162 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
170 show_regwindow32(regs);
173 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
174 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
175 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
176 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
177 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
178 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
179 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
180 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
181 if (regs->tstate & TSTATE_PRIV)
182 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
185 void show_regs(struct pt_regs *regs)
187 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
188 regs->tpc, regs->tnpc, regs->y, print_tainted());
189 printk("TPC: <%pS>\n", (void *) regs->tpc);
190 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
191 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
193 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
194 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
196 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
197 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
199 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
200 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
202 printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
203 show_regwindow(regs);
204 show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
207 struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
208 static DEFINE_SPINLOCK(global_reg_snapshot_lock);
210 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
215 global_reg_snapshot[this_cpu].tstate = regs->tstate;
216 global_reg_snapshot[this_cpu].tpc = regs->tpc;
217 global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
218 global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
220 if (regs->tstate & TSTATE_PRIV) {
221 struct reg_window *rw;
223 rw = (struct reg_window *)
224 (regs->u_regs[UREG_FP] + STACK_BIAS);
225 if (kstack_valid(tp, (unsigned long) rw)) {
226 global_reg_snapshot[this_cpu].i7 = rw->ins[7];
227 rw = (struct reg_window *)
228 (rw->ins[6] + STACK_BIAS);
229 if (kstack_valid(tp, (unsigned long) rw))
230 global_reg_snapshot[this_cpu].rpc = rw->ins[7];
233 global_reg_snapshot[this_cpu].i7 = 0;
234 global_reg_snapshot[this_cpu].rpc = 0;
236 global_reg_snapshot[this_cpu].thread = tp;
239 /* In order to avoid hangs we do not try to synchronize with the
240 * global register dump client cpus. The last store they make is to
241 * the thread pointer, so do a short poll waiting for that to become
244 static void __global_reg_poll(struct global_reg_snapshot *gp)
248 while (!gp->thread && ++limit < 100) {
254 void arch_trigger_all_cpu_backtrace(void)
256 struct thread_info *tp = current_thread_info();
257 struct pt_regs *regs = get_irq_regs();
264 spin_lock_irqsave(&global_reg_snapshot_lock, flags);
266 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
268 this_cpu = raw_smp_processor_id();
270 __global_reg_self(tp, regs, this_cpu);
272 smp_fetch_global_regs();
274 for_each_online_cpu(cpu) {
275 struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
277 __global_reg_poll(gp);
280 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
281 (cpu == this_cpu ? '*' : ' '), cpu,
282 gp->tstate, gp->tpc, gp->tnpc,
283 ((tp && tp->task) ? tp->task->comm : "NULL"),
284 ((tp && tp->task) ? tp->task->pid : -1));
286 if (gp->tstate & TSTATE_PRIV) {
287 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
293 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
294 gp->tpc, gp->o7, gp->i7, gp->rpc);
298 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
300 spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
303 #ifdef CONFIG_MAGIC_SYSRQ
305 static void sysrq_handle_globreg(int key)
307 arch_trigger_all_cpu_backtrace();
310 static struct sysrq_key_op sparc_globalreg_op = {
311 .handler = sysrq_handle_globreg,
312 .help_msg = "Globalregs",
313 .action_msg = "Show Global CPU Regs",
316 static int __init sparc_globreg_init(void)
318 return register_sysrq_key('y', &sparc_globalreg_op);
321 core_initcall(sparc_globreg_init);
325 unsigned long thread_saved_pc(struct task_struct *tsk)
327 struct thread_info *ti = task_thread_info(tsk);
328 unsigned long ret = 0xdeadbeefUL;
332 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
333 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
336 fp = (unsigned long *)(sp[14] + STACK_BIAS);
337 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
344 /* Free current thread data structures etc.. */
345 void exit_thread(void)
347 struct thread_info *t = current_thread_info();
350 if (t->utraps[0] < 2)
357 void flush_thread(void)
359 struct thread_info *t = current_thread_info();
360 struct mm_struct *mm;
364 tsb_context_switch(mm);
366 set_thread_wsaved(0);
368 /* Clear FPU register state. */
372 /* It's a bit more tricky when 64-bit tasks are involved... */
373 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
375 unsigned long fp, distance, rval;
377 if (!(test_thread_flag(TIF_32BIT))) {
380 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
383 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
385 /* Now align the stack as this is mandatory in the Sparc ABI
386 * due to how register windows work. This hides the
387 * restriction from thread libraries etc.
392 rval = (csp - distance);
393 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
395 else if (test_thread_flag(TIF_32BIT)) {
396 if (put_user(((u32)csp),
397 &(((struct reg_window32 __user *)rval)->ins[6])))
400 if (put_user(((u64)csp - STACK_BIAS),
401 &(((struct reg_window __user *)rval)->ins[6])))
404 rval = rval - STACK_BIAS;
410 /* Standard stuff. */
411 static inline void shift_window_buffer(int first_win, int last_win,
412 struct thread_info *t)
416 for (i = first_win; i < last_win; i++) {
417 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
418 memcpy(&t->reg_window[i], &t->reg_window[i+1],
419 sizeof(struct reg_window));
423 void synchronize_user_stack(void)
425 struct thread_info *t = current_thread_info();
426 unsigned long window;
428 flush_user_windows();
429 if ((window = get_thread_wsaved()) != 0) {
430 int winsize = sizeof(struct reg_window);
433 if (test_thread_flag(TIF_32BIT))
434 winsize = sizeof(struct reg_window32);
440 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
441 struct reg_window *rwin = &t->reg_window[window];
443 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
444 shift_window_buffer(window, get_thread_wsaved() - 1, t);
445 set_thread_wsaved(get_thread_wsaved() - 1);
451 static void stack_unaligned(unsigned long sp)
455 info.si_signo = SIGBUS;
457 info.si_code = BUS_ADRALN;
458 info.si_addr = (void __user *) sp;
460 force_sig_info(SIGBUS, &info, current);
463 void fault_in_user_windows(void)
465 struct thread_info *t = current_thread_info();
466 unsigned long window;
467 int winsize = sizeof(struct reg_window);
470 if (test_thread_flag(TIF_32BIT))
471 winsize = sizeof(struct reg_window32);
475 flush_user_windows();
476 window = get_thread_wsaved();
478 if (likely(window != 0)) {
481 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
482 struct reg_window *rwin = &t->reg_window[window];
484 if (unlikely(sp & 0x7UL))
487 if (unlikely(copy_to_user((char __user *)sp,
492 set_thread_wsaved(0);
496 set_thread_wsaved(window + 1);
500 asmlinkage long sparc_do_fork(unsigned long clone_flags,
501 unsigned long stack_start,
502 struct pt_regs *regs,
503 unsigned long stack_size)
505 int __user *parent_tid_ptr, *child_tid_ptr;
506 unsigned long orig_i1 = regs->u_regs[UREG_I1];
510 if (test_thread_flag(TIF_32BIT)) {
511 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
512 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
516 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
517 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
520 ret = do_fork(clone_flags, stack_start,
522 parent_tid_ptr, child_tid_ptr);
524 /* If we get an error and potentially restart the system
525 * call, we're screwed because copy_thread() clobbered
526 * the parent's %o1. So detect that case and restore it
529 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
530 regs->u_regs[UREG_I1] = orig_i1;
535 /* Copy a Sparc thread. The fork() return value conventions
536 * under SunOS are nothing short of bletcherous:
537 * Parent --> %o0 == childs pid, %o1 == 0
538 * Child --> %o0 == parents pid, %o1 == 1
540 int copy_thread(unsigned long clone_flags, unsigned long sp,
542 struct task_struct *p, struct pt_regs *regs)
544 struct thread_info *t = task_thread_info(p);
545 struct sparc_stackf *parent_sf;
546 unsigned long child_stack_sz;
547 char *child_trap_frame;
549 /* Calculate offset to stack_frame & pt_regs */
550 child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
551 child_trap_frame = (task_stack_page(p) +
552 (THREAD_SIZE - child_stack_sz));
555 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
556 t->kregs = (struct pt_regs *) (child_trap_frame +
557 sizeof(struct sparc_stackf));
560 if (unlikely(p->flags & PF_KTHREAD)) {
561 memset(child_trap_frame, 0, child_stack_sz);
562 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
563 (current_pt_regs()->tstate + 1) & TSTATE_CWP;
564 t->current_ds = ASI_P;
565 t->kregs->u_regs[UREG_G1] = sp; /* function */
566 t->kregs->u_regs[UREG_G2] = arg;
570 parent_sf = ((struct sparc_stackf *) regs) - 1;
571 memcpy(child_trap_frame, parent_sf, child_stack_sz);
572 if (t->flags & _TIF_32BIT) {
573 sp &= 0x00000000ffffffffUL;
574 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
576 t->kregs->u_regs[UREG_FP] = sp;
577 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
578 (regs->tstate + 1) & TSTATE_CWP;
579 t->current_ds = ASI_AIUS;
580 if (sp != regs->u_regs[UREG_FP]) {
583 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
586 t->kregs->u_regs[UREG_FP] = csp;
591 /* Set the return value for the child. */
592 t->kregs->u_regs[UREG_I0] = current->pid;
593 t->kregs->u_regs[UREG_I1] = 1;
595 /* Set the second return value for the parent. */
596 regs->u_regs[UREG_I1] = 0;
598 if (clone_flags & CLONE_SETTLS)
599 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
606 unsigned int pr_regs[32];
607 unsigned long pr_dregs[16];
609 unsigned int __unused;
611 unsigned char pr_qcnt;
612 unsigned char pr_q_entrysize;
614 unsigned int pr_q[64];
618 * fill in the fpu structure for a core dump.
620 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
622 unsigned long *kfpregs = current_thread_info()->fpregs;
623 unsigned long fprs = current_thread_info()->fpsaved[0];
625 if (test_thread_flag(TIF_32BIT)) {
626 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
629 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
630 sizeof(unsigned int) * 32);
632 memset(&fpregs32->pr_fr.pr_regs[0], 0,
633 sizeof(unsigned int) * 32);
634 fpregs32->pr_qcnt = 0;
635 fpregs32->pr_q_entrysize = 8;
636 memset(&fpregs32->pr_q[0], 0,
637 (sizeof(unsigned int) * 64));
638 if (fprs & FPRS_FEF) {
639 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
642 fpregs32->pr_fsr = 0;
647 memcpy(&fpregs->pr_regs[0], kfpregs,
648 sizeof(unsigned int) * 32);
650 memset(&fpregs->pr_regs[0], 0,
651 sizeof(unsigned int) * 32);
653 memcpy(&fpregs->pr_regs[16], kfpregs+16,
654 sizeof(unsigned int) * 32);
656 memset(&fpregs->pr_regs[16], 0,
657 sizeof(unsigned int) * 32);
658 if(fprs & FPRS_FEF) {
659 fpregs->pr_fsr = current_thread_info()->xfsr[0];
660 fpregs->pr_gsr = current_thread_info()->gsr[0];
662 fpregs->pr_fsr = fpregs->pr_gsr = 0;
664 fpregs->pr_fprs = fprs;
668 EXPORT_SYMBOL(dump_fpu);
670 unsigned long get_wchan(struct task_struct *task)
672 unsigned long pc, fp, bias = 0;
673 struct thread_info *tp;
674 struct reg_window *rw;
675 unsigned long ret = 0;
678 if (!task || task == current ||
679 task->state == TASK_RUNNING)
682 tp = task_thread_info(task);
684 fp = task_thread_info(task)->ksp + bias;
687 if (!kstack_valid(tp, fp))
689 rw = (struct reg_window *) fp;
691 if (!in_sched_functions(pc)) {
695 fp = rw->ins[6] + bias;
696 } while (++count < 16);