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/module.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/reboot.h>
26 #include <linux/delay.h>
27 #include <linux/compat.h>
28 #include <linux/tick.h>
29 #include <linux/init.h>
30 #include <linux/cpu.h>
31 #include <linux/elfcore.h>
32 #include <linux/sysrq.h>
34 #include <asm/oplib.h>
35 #include <asm/uaccess.h>
36 #include <asm/system.h>
38 #include <asm/pgalloc.h>
39 #include <asm/pgtable.h>
40 #include <asm/processor.h>
41 #include <asm/pstate.h>
43 #include <asm/fpumacro.h>
45 #include <asm/cpudata.h>
46 #include <asm/mmu_context.h>
47 #include <asm/unistd.h>
48 #include <asm/hypervisor.h>
49 #include <asm/sstate.h>
50 #include <asm/reboot.h>
51 #include <asm/syscalls.h>
52 #include <asm/irq_regs.h>
55 /* #define VERBOSE_SHOWREGS */
57 static void sparc64_yield(int cpu)
59 if (tlb_type != hypervisor)
62 clear_thread_flag(TIF_POLLING_NRFLAG);
63 smp_mb__after_clear_bit();
65 while (!need_resched() && !cpu_is_offline(cpu)) {
68 /* Disable interrupts. */
70 "rdpr %%pstate, %0\n\t"
72 "wrpr %0, %%g0, %%pstate"
76 if (!need_resched() && !cpu_is_offline(cpu))
79 /* Re-enable interrupts. */
81 "rdpr %%pstate, %0\n\t"
83 "wrpr %0, %%g0, %%pstate"
88 set_thread_flag(TIF_POLLING_NRFLAG);
91 /* The idle loop on sparc64. */
94 int cpu = smp_processor_id();
96 set_thread_flag(TIF_POLLING_NRFLAG);
99 tick_nohz_stop_sched_tick(1);
101 while (!need_resched() && !cpu_is_offline(cpu))
104 tick_nohz_restart_sched_tick();
106 preempt_enable_no_resched();
108 #ifdef CONFIG_HOTPLUG_CPU
109 if (cpu_is_offline(cpu))
118 void machine_halt(void)
122 panic("Halt failed!");
125 void machine_alt_power_off(void)
128 prom_halt_power_off();
129 panic("Power-off failed!");
132 void machine_restart(char * cmd)
137 p = strchr (reboot_command, '\n');
142 prom_reboot(reboot_command);
144 panic("Reboot failed!");
148 static void show_regwindow32(struct pt_regs *regs)
150 struct reg_window32 __user *rw;
151 struct reg_window32 r_w;
154 __asm__ __volatile__ ("flushw");
155 rw = compat_ptr((unsigned)regs->u_regs[14]);
158 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
164 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
165 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
166 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
167 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
168 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
169 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
170 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
171 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
174 #define show_regwindow32(regs) do { } while (0)
177 static void show_regwindow(struct pt_regs *regs)
179 struct reg_window __user *rw;
180 struct reg_window *rwk;
181 struct reg_window r_w;
184 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
185 __asm__ __volatile__ ("flushw");
186 rw = (struct reg_window __user *)
187 (regs->u_regs[14] + STACK_BIAS);
188 rwk = (struct reg_window *)
189 (regs->u_regs[14] + STACK_BIAS);
190 if (!(regs->tstate & TSTATE_PRIV)) {
193 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
201 show_regwindow32(regs);
204 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
205 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
206 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
207 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
208 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
209 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
210 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
211 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
212 if (regs->tstate & TSTATE_PRIV)
213 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
217 static DEFINE_SPINLOCK(regdump_lock);
220 void __show_regs(struct pt_regs * regs)
225 /* Protect against xcall ipis which might lead to livelock on the lock */
226 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
227 "wrpr %0, %1, %%pstate"
230 spin_lock(®dump_lock);
232 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
233 regs->tpc, regs->tnpc, regs->y, print_tainted());
234 printk("TPC: <%pS>\n", (void *) regs->tpc);
235 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
236 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
238 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
239 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
241 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
242 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
244 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
245 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
247 printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
248 show_regwindow(regs);
250 spin_unlock(®dump_lock);
251 __asm__ __volatile__("wrpr %0, 0, %%pstate"
256 #ifdef VERBOSE_SHOWREGS
257 static void idump_from_user (unsigned int *pc)
262 if((((unsigned long) pc) & 3))
266 for(i = -3; i < 6; i++) {
268 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
275 void show_regs(struct pt_regs *regs)
277 #ifdef VERBOSE_SHOWREGS
278 extern long etrap, etraptl1;
284 extern void smp_report_regs(void);
291 #ifdef VERBOSE_SHOWREGS
292 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
293 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
294 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
295 printk ("*********parent**********\n");
296 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
297 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
298 printk ("*********endpar**********\n");
303 #ifdef CONFIG_MAGIC_SYSRQ
304 struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
305 static DEFINE_SPINLOCK(global_reg_snapshot_lock);
307 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
312 global_reg_snapshot[this_cpu].tstate = regs->tstate;
313 global_reg_snapshot[this_cpu].tpc = regs->tpc;
314 global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
315 global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
317 if (regs->tstate & TSTATE_PRIV) {
318 struct reg_window *rw;
320 rw = (struct reg_window *)
321 (regs->u_regs[UREG_FP] + STACK_BIAS);
322 global_reg_snapshot[this_cpu].i7 = rw->ins[6];
324 global_reg_snapshot[this_cpu].i7 = 0;
326 global_reg_snapshot[this_cpu].thread = tp;
329 /* In order to avoid hangs we do not try to synchronize with the
330 * global register dump client cpus. The last store they make is to
331 * the thread pointer, so do a short poll waiting for that to become
334 static void __global_reg_poll(struct global_reg_snapshot *gp)
338 while (!gp->thread && ++limit < 100) {
344 static void sysrq_handle_globreg(int key, struct tty_struct *tty)
346 struct thread_info *tp = current_thread_info();
347 struct pt_regs *regs = get_irq_regs();
354 spin_lock_irqsave(&global_reg_snapshot_lock, flags);
356 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
358 this_cpu = raw_smp_processor_id();
360 __global_reg_self(tp, regs, this_cpu);
362 smp_fetch_global_regs();
364 for_each_online_cpu(cpu) {
365 struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
366 struct thread_info *tp;
368 __global_reg_poll(gp);
371 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
372 (cpu == this_cpu ? '*' : ' '), cpu,
373 gp->tstate, gp->tpc, gp->tnpc,
374 ((tp && tp->task) ? tp->task->comm : "NULL"),
375 ((tp && tp->task) ? tp->task->pid : -1));
377 if (gp->tstate & TSTATE_PRIV) {
378 printk(" TPC[%pS] O7[%pS] I7[%pS]\n",
383 printk(" TPC[%lx] O7[%lx] I7[%lx]\n",
384 gp->tpc, gp->o7, gp->i7);
388 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
390 spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
393 static struct sysrq_key_op sparc_globalreg_op = {
394 .handler = sysrq_handle_globreg,
395 .help_msg = "Globalregs",
396 .action_msg = "Show Global CPU Regs",
399 static int __init sparc_globreg_init(void)
401 return register_sysrq_key('y', &sparc_globalreg_op);
404 core_initcall(sparc_globreg_init);
408 unsigned long thread_saved_pc(struct task_struct *tsk)
410 struct thread_info *ti = task_thread_info(tsk);
411 unsigned long ret = 0xdeadbeefUL;
415 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
416 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
419 fp = (unsigned long *)(sp[14] + STACK_BIAS);
420 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
427 /* Free current thread data structures etc.. */
428 void exit_thread(void)
430 struct thread_info *t = current_thread_info();
433 if (t->utraps[0] < 2)
439 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
440 t->user_cntd0 = t->user_cntd1 = NULL;
446 void flush_thread(void)
448 struct thread_info *t = current_thread_info();
449 struct mm_struct *mm;
451 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
452 clear_ti_thread_flag(t, TIF_ABI_PENDING);
453 if (test_ti_thread_flag(t, TIF_32BIT))
454 clear_ti_thread_flag(t, TIF_32BIT);
456 set_ti_thread_flag(t, TIF_32BIT);
461 tsb_context_switch(mm);
463 set_thread_wsaved(0);
465 /* Turn off performance counters if on. */
466 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
467 t->user_cntd0 = t->user_cntd1 = NULL;
472 /* Clear FPU register state. */
475 if (get_thread_current_ds() != ASI_AIUS)
479 /* It's a bit more tricky when 64-bit tasks are involved... */
480 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
482 unsigned long fp, distance, rval;
484 if (!(test_thread_flag(TIF_32BIT))) {
487 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
490 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
492 /* Now 8-byte align the stack as this is mandatory in the
493 * Sparc ABI due to how register windows work. This hides
494 * the restriction from thread libraries etc. -DaveM
499 rval = (csp - distance);
500 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
502 else if (test_thread_flag(TIF_32BIT)) {
503 if (put_user(((u32)csp),
504 &(((struct reg_window32 __user *)rval)->ins[6])))
507 if (put_user(((u64)csp - STACK_BIAS),
508 &(((struct reg_window __user *)rval)->ins[6])))
511 rval = rval - STACK_BIAS;
517 /* Standard stuff. */
518 static inline void shift_window_buffer(int first_win, int last_win,
519 struct thread_info *t)
523 for (i = first_win; i < last_win; i++) {
524 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
525 memcpy(&t->reg_window[i], &t->reg_window[i+1],
526 sizeof(struct reg_window));
530 void synchronize_user_stack(void)
532 struct thread_info *t = current_thread_info();
533 unsigned long window;
535 flush_user_windows();
536 if ((window = get_thread_wsaved()) != 0) {
537 int winsize = sizeof(struct reg_window);
540 if (test_thread_flag(TIF_32BIT))
541 winsize = sizeof(struct reg_window32);
547 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
548 struct reg_window *rwin = &t->reg_window[window];
550 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
551 shift_window_buffer(window, get_thread_wsaved() - 1, t);
552 set_thread_wsaved(get_thread_wsaved() - 1);
558 static void stack_unaligned(unsigned long sp)
562 info.si_signo = SIGBUS;
564 info.si_code = BUS_ADRALN;
565 info.si_addr = (void __user *) sp;
567 force_sig_info(SIGBUS, &info, current);
570 void fault_in_user_windows(void)
572 struct thread_info *t = current_thread_info();
573 unsigned long window;
574 int winsize = sizeof(struct reg_window);
577 if (test_thread_flag(TIF_32BIT))
578 winsize = sizeof(struct reg_window32);
582 flush_user_windows();
583 window = get_thread_wsaved();
585 if (likely(window != 0)) {
588 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
589 struct reg_window *rwin = &t->reg_window[window];
591 if (unlikely(sp & 0x7UL))
594 if (unlikely(copy_to_user((char __user *)sp,
599 set_thread_wsaved(0);
603 set_thread_wsaved(window + 1);
607 asmlinkage long sparc_do_fork(unsigned long clone_flags,
608 unsigned long stack_start,
609 struct pt_regs *regs,
610 unsigned long stack_size)
612 int __user *parent_tid_ptr, *child_tid_ptr;
613 unsigned long orig_i1 = regs->u_regs[UREG_I1];
617 if (test_thread_flag(TIF_32BIT)) {
618 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
619 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
623 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
624 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
627 ret = do_fork(clone_flags, stack_start,
629 parent_tid_ptr, child_tid_ptr);
631 /* If we get an error and potentially restart the system
632 * call, we're screwed because copy_thread() clobbered
633 * the parent's %o1. So detect that case and restore it
636 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
637 regs->u_regs[UREG_I1] = orig_i1;
642 /* Copy a Sparc thread. The fork() return value conventions
643 * under SunOS are nothing short of bletcherous:
644 * Parent --> %o0 == childs pid, %o1 == 0
645 * Child --> %o0 == parents pid, %o1 == 1
647 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
648 unsigned long unused,
649 struct task_struct *p, struct pt_regs *regs)
651 struct thread_info *t = task_thread_info(p);
652 struct sparc_stackf *parent_sf;
653 unsigned long child_stack_sz;
654 char *child_trap_frame;
657 kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0;
658 parent_sf = ((struct sparc_stackf *) regs) - 1;
660 /* Calculate offset to stack_frame & pt_regs */
661 child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) +
662 (kernel_thread ? STACKFRAME_SZ : 0));
663 child_trap_frame = (task_stack_page(p) +
664 (THREAD_SIZE - child_stack_sz));
665 memcpy(child_trap_frame, parent_sf, child_stack_sz);
667 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) |
668 (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
669 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
671 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
672 t->kregs = (struct pt_regs *) (child_trap_frame +
673 sizeof(struct sparc_stackf));
677 struct sparc_stackf *child_sf = (struct sparc_stackf *)
678 (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ));
680 /* Zero terminate the stack backtrace. */
682 t->kregs->u_regs[UREG_FP] =
683 ((unsigned long) child_sf) - STACK_BIAS;
685 /* Special case, if we are spawning a kernel thread from
686 * a userspace task (usermode helper, NFS or similar), we
687 * must disable performance counters in the child because
688 * the address space and protection realm are changing.
690 if (t->flags & _TIF_PERFCTR) {
691 t->user_cntd0 = t->user_cntd1 = NULL;
693 t->flags &= ~_TIF_PERFCTR;
695 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
696 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
697 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
699 if (t->flags & _TIF_32BIT) {
700 sp &= 0x00000000ffffffffUL;
701 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
703 t->kregs->u_regs[UREG_FP] = sp;
704 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
705 if (sp != regs->u_regs[UREG_FP]) {
708 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
711 t->kregs->u_regs[UREG_FP] = csp;
717 /* Set the return value for the child. */
718 t->kregs->u_regs[UREG_I0] = current->pid;
719 t->kregs->u_regs[UREG_I1] = 1;
721 /* Set the second return value for the parent. */
722 regs->u_regs[UREG_I1] = 0;
724 if (clone_flags & CLONE_SETTLS)
725 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
731 * This is the mechanism for creating a new kernel thread.
733 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
734 * who haven't done an "execve()") should use this: it will work within
735 * a system call from a "real" process, but the process memory space will
736 * not be freed until both the parent and the child have exited.
738 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
742 /* If the parent runs before fn(arg) is called by the child,
743 * the input registers of this function can be clobbered.
744 * So we stash 'fn' and 'arg' into global registers which
745 * will not be modified by the parent.
747 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
748 "mov %5, %%g3\n\t" /* Save ARG into global */
749 "mov %1, %%g1\n\t" /* Clone syscall nr. */
750 "mov %2, %%o0\n\t" /* Clone flags. */
751 "mov 0, %%o1\n\t" /* usp arg == 0 */
752 "t 0x6d\n\t" /* Linux/Sparc clone(). */
753 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
755 "jmpl %%g2, %%o7\n\t" /* Call the function. */
756 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
758 "t 0x6d\n\t" /* Linux/Sparc exit(). */
759 /* Notreached by child. */
762 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
763 "i" (__NR_exit), "r" (fn), "r" (arg) :
764 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
770 unsigned int pr_regs[32];
771 unsigned long pr_dregs[16];
773 unsigned int __unused;
775 unsigned char pr_qcnt;
776 unsigned char pr_q_entrysize;
778 unsigned int pr_q[64];
782 * fill in the fpu structure for a core dump.
784 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
786 unsigned long *kfpregs = current_thread_info()->fpregs;
787 unsigned long fprs = current_thread_info()->fpsaved[0];
789 if (test_thread_flag(TIF_32BIT)) {
790 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
793 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
794 sizeof(unsigned int) * 32);
796 memset(&fpregs32->pr_fr.pr_regs[0], 0,
797 sizeof(unsigned int) * 32);
798 fpregs32->pr_qcnt = 0;
799 fpregs32->pr_q_entrysize = 8;
800 memset(&fpregs32->pr_q[0], 0,
801 (sizeof(unsigned int) * 64));
802 if (fprs & FPRS_FEF) {
803 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
806 fpregs32->pr_fsr = 0;
811 memcpy(&fpregs->pr_regs[0], kfpregs,
812 sizeof(unsigned int) * 32);
814 memset(&fpregs->pr_regs[0], 0,
815 sizeof(unsigned int) * 32);
817 memcpy(&fpregs->pr_regs[16], kfpregs+16,
818 sizeof(unsigned int) * 32);
820 memset(&fpregs->pr_regs[16], 0,
821 sizeof(unsigned int) * 32);
822 if(fprs & FPRS_FEF) {
823 fpregs->pr_fsr = current_thread_info()->xfsr[0];
824 fpregs->pr_gsr = current_thread_info()->gsr[0];
826 fpregs->pr_fsr = fpregs->pr_gsr = 0;
828 fpregs->pr_fprs = fprs;
834 * sparc_execve() executes a new program after the asm stub has set
835 * things up for us. This should basically do what I want it to.
837 asmlinkage int sparc_execve(struct pt_regs *regs)
842 /* User register window flush is done by entry.S */
844 /* Check for indirect call. */
845 if (regs->u_regs[UREG_G1] == 0)
848 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
849 error = PTR_ERR(filename);
850 if (IS_ERR(filename))
852 error = do_execve(filename,
853 (char __user * __user *)
854 regs->u_regs[base + UREG_I1],
855 (char __user * __user *)
856 regs->u_regs[base + UREG_I2], regs);
860 current_thread_info()->xfsr[0] = 0;
861 current_thread_info()->fpsaved[0] = 0;
862 regs->tstate &= ~TSTATE_PEF;
868 unsigned long get_wchan(struct task_struct *task)
870 unsigned long pc, fp, bias = 0;
871 unsigned long thread_info_base;
872 struct reg_window *rw;
873 unsigned long ret = 0;
876 if (!task || task == current ||
877 task->state == TASK_RUNNING)
880 thread_info_base = (unsigned long) task_stack_page(task);
882 fp = task_thread_info(task)->ksp + bias;
885 /* Bogus frame pointer? */
886 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
887 fp >= (thread_info_base + THREAD_SIZE))
889 rw = (struct reg_window *) fp;
891 if (!in_sched_functions(pc)) {
895 fp = rw->ins[6] + bias;
896 } while (++count < 16);