1 /* $Id: process.c,v 1.131 2002/02/09 19:49:30 davem Exp $
2 * arch/sparc64/kernel/process.c
4 * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
10 * This file handles the architecture-dependent parts of process handling..
15 #include <linux/errno.h>
16 #include <linux/module.h>
17 #include <linux/sched.h>
18 #include <linux/kernel.h>
19 #include <linux/kallsyms.h>
21 #include <linux/smp.h>
22 #include <linux/smp_lock.h>
23 #include <linux/stddef.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/a.out.h>
28 #include <linux/config.h>
29 #include <linux/reboot.h>
30 #include <linux/delay.h>
31 #include <linux/init.h>
33 #include <asm/oplib.h>
34 #include <asm/uaccess.h>
35 #include <asm/system.h>
37 #include <asm/pgalloc.h>
38 #include <asm/pgtable.h>
39 #include <asm/processor.h>
40 #include <asm/pstate.h>
42 #include <asm/fpumacro.h>
44 #include <asm/cpudata.h>
45 #include <asm/unistd.h>
47 /* #define VERBOSE_SHOWREGS */
50 * Nothing special yet...
52 void default_idle(void)
59 * the idle loop on a Sparc... ;)
63 if (current->pid != 0)
66 /* endless idle loop with no priority at all */
68 /* If current->work.need_resched is zero we should really
69 * setup for a system wakup event and execute a shutdown
72 * But this requires writing back the contents of the
73 * L2 cache etc. so implement this later. -DaveM
75 while (!need_resched())
87 * the idle loop on a UltraMultiPenguin...
89 #define idle_me_harder() (cpu_data(smp_processor_id()).idle_volume += 1)
90 #define unidle_me() (cpu_data(smp_processor_id()).idle_volume = 0)
93 set_thread_flag(TIF_POLLING_NRFLAG);
97 clear_thread_flag(TIF_POLLING_NRFLAG);
99 set_thread_flag(TIF_POLLING_NRFLAG);
104 /* The store ordering is so that IRQ handlers on
105 * other cpus see our increasing idleness for the buddy
106 * redistribution algorithm. -DaveM
108 membar("#StoreStore | #StoreLoad");
114 extern char reboot_command [];
116 extern void (*prom_palette)(int);
117 extern void (*prom_keyboard)(void);
119 void machine_halt(void)
121 if (!serial_console && prom_palette)
126 panic("Halt failed!");
129 EXPORT_SYMBOL(machine_halt);
131 void machine_alt_power_off(void)
133 if (!serial_console && prom_palette)
137 prom_halt_power_off();
138 panic("Power-off failed!");
141 void machine_restart(char * cmd)
145 p = strchr (reboot_command, '\n');
147 if (!serial_console && prom_palette)
154 prom_reboot(reboot_command);
156 panic("Reboot failed!");
159 EXPORT_SYMBOL(machine_restart);
161 static void show_regwindow32(struct pt_regs *regs)
163 struct reg_window32 *rw;
164 struct reg_window32 r_w;
167 __asm__ __volatile__ ("flushw");
168 rw = (struct reg_window32 *)((long)(unsigned)regs->u_regs[14]);
171 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
177 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
178 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
179 rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
180 rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
181 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
182 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
183 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
184 rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
187 static void show_regwindow(struct pt_regs *regs)
189 struct reg_window *rw;
190 struct reg_window r_w;
193 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
194 __asm__ __volatile__ ("flushw");
195 rw = (struct reg_window *)(regs->u_regs[14] + STACK_BIAS);
196 if (!(regs->tstate & TSTATE_PRIV)) {
199 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
207 show_regwindow32(regs);
210 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
211 rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3]);
212 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
213 rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
214 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
215 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3]);
216 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
217 rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
218 if (regs->tstate & TSTATE_PRIV)
219 print_symbol("I7: <%s>\n", rw->ins[7]);
222 void show_stackframe(struct sparc_stackf *sf)
228 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
229 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
230 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
231 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
232 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
233 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
234 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
235 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
236 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
237 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
238 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
239 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
241 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
242 size -= STACKFRAME_SZ;
243 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
246 printk("s%d: %016lx\n", i++, *stk++);
247 } while ((size -= sizeof(unsigned long)));
250 void show_stackframe32(struct sparc_stackf32 *sf)
256 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
257 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
258 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
259 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
260 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
261 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
262 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
263 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
264 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
265 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
266 sf->structptr, sf->xargs[0], sf->xargs[1],
267 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
269 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
270 size -= STACKFRAME32_SZ;
271 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
274 printk("s%d: %08x\n", i++, *stk++);
275 } while ((size -= sizeof(unsigned)));
279 static spinlock_t regdump_lock = SPIN_LOCK_UNLOCKED;
282 void __show_regs(struct pt_regs * regs)
287 /* Protect against xcall ipis which might lead to livelock on the lock */
288 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
289 "wrpr %0, %1, %%pstate"
292 spin_lock(®dump_lock);
294 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
295 regs->tpc, regs->tnpc, regs->y, print_tainted());
296 print_symbol("TPC: <%s>\n", regs->tpc);
297 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
298 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
300 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
301 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
303 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
304 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
306 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
307 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
309 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
310 show_regwindow(regs);
312 spin_unlock(®dump_lock);
313 __asm__ __volatile__("wrpr %0, 0, %%pstate"
318 #ifdef VERBOSE_SHOWREGS
319 static void idump_from_user (unsigned int *pc)
324 if((((unsigned long) pc) & 3))
328 for(i = -3; i < 6; i++) {
330 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
337 void show_regs(struct pt_regs *regs)
339 #ifdef VERBOSE_SHOWREGS
340 extern long etrap, etraptl1;
345 extern void smp_report_regs(void);
351 #ifdef VERBOSE_SHOWREGS
352 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
353 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
354 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
355 printk ("*********parent**********\n");
356 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
357 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
358 printk ("*********endpar**********\n");
363 void show_regs32(struct pt_regs32 *regs)
365 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
366 regs->pc, regs->npc, regs->y, print_tainted());
367 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
368 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
370 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
371 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
373 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
374 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
376 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
377 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
381 unsigned long thread_saved_pc(struct task_struct *tsk)
383 struct thread_info *ti = tsk->thread_info;
384 unsigned long ret = 0xdeadbeefUL;
388 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
389 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
392 fp = (unsigned long *)(sp[14] + STACK_BIAS);
393 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
400 /* Free current thread data structures etc.. */
401 void exit_thread(void)
403 struct thread_info *t = current_thread_info();
406 if (t->utraps[0] < 2)
412 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
413 t->user_cntd0 = t->user_cntd1 = NULL;
419 void flush_thread(void)
421 struct thread_info *t = current_thread_info();
423 if (t->flags & _TIF_ABI_PENDING)
424 t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
427 unsigned long pgd_cache = 0UL;
428 if (test_thread_flag(TIF_32BIT)) {
429 struct mm_struct *mm = t->task->mm;
430 pgd_t *pgd0 = &mm->pgd[0];
432 if (pgd_none(*pgd0)) {
433 pmd_t *page = pmd_alloc_one_fast(NULL, 0);
435 page = pmd_alloc_one(NULL, 0);
438 pgd_cache = ((unsigned long) pgd_val(*pgd0)) << 11UL;
440 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
447 set_thread_wsaved(0);
449 /* Turn off performance counters if on. */
450 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
451 t->user_cntd0 = t->user_cntd1 = NULL;
456 /* Clear FPU register state. */
459 if (get_thread_current_ds() != ASI_AIUS)
462 /* Init new signal delivery disposition. */
463 clear_thread_flag(TIF_NEWSIGNALS);
466 /* It's a bit more tricky when 64-bit tasks are involved... */
467 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
469 unsigned long fp, distance, rval;
471 if (!(test_thread_flag(TIF_32BIT))) {
474 __get_user(fp, &(((struct reg_window *)psp)->ins[6]));
477 __get_user(fp, &(((struct reg_window32 *)psp)->ins[6]));
479 /* Now 8-byte align the stack as this is mandatory in the
480 * Sparc ABI due to how register windows work. This hides
481 * the restriction from thread libraries etc. -DaveM
486 rval = (csp - distance);
487 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
489 else if (test_thread_flag(TIF_32BIT)) {
490 if (put_user(((u32)csp), &(((struct reg_window32 *)rval)->ins[6])))
493 if (put_user(((u64)csp - STACK_BIAS),
494 &(((struct reg_window *)rval)->ins[6])))
497 rval = rval - STACK_BIAS;
503 /* Standard stuff. */
504 static inline void shift_window_buffer(int first_win, int last_win,
505 struct thread_info *t)
509 for (i = first_win; i < last_win; i++) {
510 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
511 memcpy(&t->reg_window[i], &t->reg_window[i+1],
512 sizeof(struct reg_window));
516 void synchronize_user_stack(void)
518 struct thread_info *t = current_thread_info();
519 unsigned long window;
521 flush_user_windows();
522 if ((window = get_thread_wsaved()) != 0) {
523 int winsize = sizeof(struct reg_window);
526 if (test_thread_flag(TIF_32BIT))
527 winsize = sizeof(struct reg_window32);
533 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
534 struct reg_window *rwin = &t->reg_window[window];
536 if (!copy_to_user((char *)sp, rwin, winsize)) {
537 shift_window_buffer(window, get_thread_wsaved() - 1, t);
538 set_thread_wsaved(get_thread_wsaved() - 1);
544 void fault_in_user_windows(void)
546 struct thread_info *t = current_thread_info();
547 unsigned long window;
548 int winsize = sizeof(struct reg_window);
551 if (test_thread_flag(TIF_32BIT))
552 winsize = sizeof(struct reg_window32);
556 flush_user_windows();
557 window = get_thread_wsaved();
562 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
563 struct reg_window *rwin = &t->reg_window[window];
565 if (copy_to_user((char *)sp, rwin, winsize))
569 set_thread_wsaved(0);
573 set_thread_wsaved(window + 1);
577 asmlinkage int sparc_do_fork(unsigned long clone_flags,
578 unsigned long stack_start,
579 struct pt_regs *regs,
580 unsigned long stack_size)
582 unsigned long parent_tid_ptr, child_tid_ptr;
584 clone_flags &= ~CLONE_IDLETASK;
586 parent_tid_ptr = regs->u_regs[UREG_I2];
587 child_tid_ptr = regs->u_regs[UREG_I4];
588 if (test_thread_flag(TIF_32BIT)) {
589 parent_tid_ptr &= 0xffffffff;
590 child_tid_ptr &= 0xffffffff;
593 return do_fork(clone_flags, stack_start,
595 (int *) parent_tid_ptr,
596 (int *) child_tid_ptr);
599 /* Copy a Sparc thread. The fork() return value conventions
600 * under SunOS are nothing short of bletcherous:
601 * Parent --> %o0 == childs pid, %o1 == 0
602 * Child --> %o0 == parents pid, %o1 == 1
604 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
605 unsigned long unused,
606 struct task_struct *p, struct pt_regs *regs)
608 struct thread_info *t = p->thread_info;
609 char *child_trap_frame;
611 #ifdef CONFIG_DEBUG_SPINLOCK
612 p->thread.smp_lock_count = 0;
613 p->thread.smp_lock_pc = 0;
616 p->set_child_tid = p->clear_child_tid = NULL;
618 /* Calculate offset to stack_frame & pt_regs */
619 child_trap_frame = ((char *)t) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
620 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
622 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
624 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
625 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
626 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
629 if (regs->tstate & TSTATE_PRIV) {
630 /* Special case, if we are spawning a kernel thread from
631 * a userspace task (via KMOD, NFS, or similar) we must
632 * disable performance counters in the child because the
633 * address space and protection realm are changing.
635 if (t->flags & _TIF_PERFCTR) {
636 t->user_cntd0 = t->user_cntd1 = NULL;
638 t->flags &= ~_TIF_PERFCTR;
640 t->kregs->u_regs[UREG_FP] = t->ksp;
641 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
642 flush_register_windows();
643 memcpy((void *)(t->ksp + STACK_BIAS),
644 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
645 sizeof(struct sparc_stackf));
646 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
647 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
649 if (t->flags & _TIF_32BIT) {
650 sp &= 0x00000000ffffffffUL;
651 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
653 t->kregs->u_regs[UREG_FP] = sp;
654 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
655 if (sp != regs->u_regs[UREG_FP]) {
658 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
661 t->kregs->u_regs[UREG_FP] = csp;
667 /* Set the return value for the child. */
668 t->kregs->u_regs[UREG_I0] = current->pid;
669 t->kregs->u_regs[UREG_I1] = 1;
671 /* Set the second return value for the parent. */
672 regs->u_regs[UREG_I1] = 0;
674 if (clone_flags & CLONE_SETTLS)
675 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
681 * This is the mechanism for creating a new kernel thread.
683 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
684 * who haven't done an "execve()") should use this: it will work within
685 * a system call from a "real" process, but the process memory space will
686 * not be free'd until both the parent and the child have exited.
688 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
692 /* If the parent runs before fn(arg) is called by the child,
693 * the input registers of this function can be clobbered.
694 * So we stash 'fn' and 'arg' into global registers which
695 * will not be modified by the parent.
697 __asm__ __volatile("mov %4, %%g2\n\t" /* Save FN into global */
698 "mov %5, %%g3\n\t" /* Save ARG into global */
699 "mov %1, %%g1\n\t" /* Clone syscall nr. */
700 "mov %2, %%o0\n\t" /* Clone flags. */
701 "mov 0, %%o1\n\t" /* usp arg == 0 */
702 "t 0x6d\n\t" /* Linux/Sparc clone(). */
703 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
705 "jmpl %%g2, %%o7\n\t" /* Call the function. */
706 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
708 "t 0x6d\n\t" /* Linux/Sparc exit(). */
709 /* Notreached by child. */
712 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
713 "i" (__NR_exit), "r" (fn), "r" (arg) :
714 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
719 * fill in the user structure for a core dump..
721 void dump_thread(struct pt_regs * regs, struct user * dump)
723 /* Only should be used for SunOS and ancient a.out
724 * SparcLinux binaries... Not worth implementing.
726 memset(dump, 0, sizeof(struct user));
731 unsigned int pr_regs[32];
732 unsigned long pr_dregs[16];
734 unsigned int __unused;
736 unsigned char pr_qcnt;
737 unsigned char pr_q_entrysize;
739 unsigned int pr_q[64];
743 * fill in the fpu structure for a core dump.
745 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
747 unsigned long *kfpregs = current_thread_info()->fpregs;
748 unsigned long fprs = current_thread_info()->fpsaved[0];
750 if (test_thread_flag(TIF_32BIT)) {
751 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
754 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
755 sizeof(unsigned int) * 32);
757 memset(&fpregs32->pr_fr.pr_regs[0], 0,
758 sizeof(unsigned int) * 32);
759 fpregs32->pr_qcnt = 0;
760 fpregs32->pr_q_entrysize = 8;
761 memset(&fpregs32->pr_q[0], 0,
762 (sizeof(unsigned int) * 64));
763 if (fprs & FPRS_FEF) {
764 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
767 fpregs32->pr_fsr = 0;
772 memcpy(&fpregs->pr_regs[0], kfpregs,
773 sizeof(unsigned int) * 32);
775 memset(&fpregs->pr_regs[0], 0,
776 sizeof(unsigned int) * 32);
778 memcpy(&fpregs->pr_regs[16], kfpregs+16,
779 sizeof(unsigned int) * 32);
781 memset(&fpregs->pr_regs[16], 0,
782 sizeof(unsigned int) * 32);
783 if(fprs & FPRS_FEF) {
784 fpregs->pr_fsr = current_thread_info()->xfsr[0];
785 fpregs->pr_gsr = current_thread_info()->gsr[0];
787 fpregs->pr_fsr = fpregs->pr_gsr = 0;
789 fpregs->pr_fprs = fprs;
795 * sparc_execve() executes a new program after the asm stub has set
796 * things up for us. This should basically do what I want it to.
798 asmlinkage int sparc_execve(struct pt_regs *regs)
803 /* User register window flush is done by entry.S */
805 /* Check for indirect call. */
806 if (regs->u_regs[UREG_G1] == 0)
809 filename = getname((char *)regs->u_regs[base + UREG_I0]);
810 error = PTR_ERR(filename);
811 if (IS_ERR(filename))
813 error = do_execve(filename, (char **) regs->u_regs[base + UREG_I1],
814 (char **) regs->u_regs[base + UREG_I2], regs);
818 current_thread_info()->xfsr[0] = 0;
819 current_thread_info()->fpsaved[0] = 0;
820 regs->tstate &= ~TSTATE_PEF;
821 current->ptrace &= ~PT_DTRACE;
827 unsigned long get_wchan(struct task_struct *task)
829 unsigned long pc, fp, bias = 0;
830 unsigned long thread_info_base;
831 struct reg_window *rw;
832 unsigned long ret = 0;
835 if (!task || task == current ||
836 task->state == TASK_RUNNING)
839 thread_info_base = (unsigned long) task->thread_info;
841 fp = task->thread_info->ksp + bias;
844 /* Bogus frame pointer? */
845 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
846 fp >= (thread_info_base + THREAD_SIZE))
848 rw = (struct reg_window *) fp;
850 if (pc < ((unsigned long) scheduling_functions_start_here) ||
851 pc >= ((unsigned long) scheduling_functions_end_here)) {
855 fp = rw->ins[6] + bias;
856 } while (++count < 16);