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 struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
304 static DEFINE_SPINLOCK(global_reg_snapshot_lock);
306 static bool kstack_valid(struct thread_info *tp, struct reg_window *rw)
308 unsigned long thread_base, fp;
310 thread_base = (unsigned long) tp;
311 fp = (unsigned long) rw;
313 if (fp < (thread_base + sizeof(struct thread_info)) ||
314 fp >= (thread_base + THREAD_SIZE))
319 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
324 global_reg_snapshot[this_cpu].tstate = regs->tstate;
325 global_reg_snapshot[this_cpu].tpc = regs->tpc;
326 global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
327 global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
329 if (regs->tstate & TSTATE_PRIV) {
330 struct thread_info *tp = current_thread_info();
331 struct reg_window *rw;
333 rw = (struct reg_window *)
334 (regs->u_regs[UREG_FP] + STACK_BIAS);
335 if (kstack_valid(tp, rw)) {
336 global_reg_snapshot[this_cpu].i7 = rw->ins[7];
337 rw = (struct reg_window *)
338 (rw->ins[6] + STACK_BIAS);
339 if (kstack_valid(tp, rw))
340 global_reg_snapshot[this_cpu].rpc = rw->ins[7];
343 global_reg_snapshot[this_cpu].i7 = 0;
344 global_reg_snapshot[this_cpu].rpc = 0;
346 global_reg_snapshot[this_cpu].thread = tp;
349 /* In order to avoid hangs we do not try to synchronize with the
350 * global register dump client cpus. The last store they make is to
351 * the thread pointer, so do a short poll waiting for that to become
354 static void __global_reg_poll(struct global_reg_snapshot *gp)
358 while (!gp->thread && ++limit < 100) {
364 void __trigger_all_cpu_backtrace(void)
366 struct thread_info *tp = current_thread_info();
367 struct pt_regs *regs = get_irq_regs();
374 spin_lock_irqsave(&global_reg_snapshot_lock, flags);
376 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
378 this_cpu = raw_smp_processor_id();
380 __global_reg_self(tp, regs, this_cpu);
382 smp_fetch_global_regs();
384 for_each_online_cpu(cpu) {
385 struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
386 struct thread_info *tp;
388 __global_reg_poll(gp);
391 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
392 (cpu == this_cpu ? '*' : ' '), cpu,
393 gp->tstate, gp->tpc, gp->tnpc,
394 ((tp && tp->task) ? tp->task->comm : "NULL"),
395 ((tp && tp->task) ? tp->task->pid : -1));
397 if (gp->tstate & TSTATE_PRIV) {
398 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
404 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
405 gp->tpc, gp->o7, gp->i7, gp->rpc);
409 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
411 spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
414 #ifdef CONFIG_MAGIC_SYSRQ
416 static void sysrq_handle_globreg(int key, struct tty_struct *tty)
418 __trigger_all_cpu_backtrace();
421 static struct sysrq_key_op sparc_globalreg_op = {
422 .handler = sysrq_handle_globreg,
423 .help_msg = "Globalregs",
424 .action_msg = "Show Global CPU Regs",
427 static int __init sparc_globreg_init(void)
429 return register_sysrq_key('y', &sparc_globalreg_op);
432 core_initcall(sparc_globreg_init);
436 unsigned long thread_saved_pc(struct task_struct *tsk)
438 struct thread_info *ti = task_thread_info(tsk);
439 unsigned long ret = 0xdeadbeefUL;
443 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
444 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
447 fp = (unsigned long *)(sp[14] + STACK_BIAS);
448 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
455 /* Free current thread data structures etc.. */
456 void exit_thread(void)
458 struct thread_info *t = current_thread_info();
461 if (t->utraps[0] < 2)
467 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
468 t->user_cntd0 = t->user_cntd1 = NULL;
474 void flush_thread(void)
476 struct thread_info *t = current_thread_info();
477 struct mm_struct *mm;
479 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
480 clear_ti_thread_flag(t, TIF_ABI_PENDING);
481 if (test_ti_thread_flag(t, TIF_32BIT))
482 clear_ti_thread_flag(t, TIF_32BIT);
484 set_ti_thread_flag(t, TIF_32BIT);
489 tsb_context_switch(mm);
491 set_thread_wsaved(0);
493 /* Turn off performance counters if on. */
494 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
495 t->user_cntd0 = t->user_cntd1 = NULL;
500 /* Clear FPU register state. */
503 if (get_thread_current_ds() != ASI_AIUS)
507 /* It's a bit more tricky when 64-bit tasks are involved... */
508 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
510 unsigned long fp, distance, rval;
512 if (!(test_thread_flag(TIF_32BIT))) {
515 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
518 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
520 /* Now 8-byte align the stack as this is mandatory in the
521 * Sparc ABI due to how register windows work. This hides
522 * the restriction from thread libraries etc. -DaveM
527 rval = (csp - distance);
528 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
530 else if (test_thread_flag(TIF_32BIT)) {
531 if (put_user(((u32)csp),
532 &(((struct reg_window32 __user *)rval)->ins[6])))
535 if (put_user(((u64)csp - STACK_BIAS),
536 &(((struct reg_window __user *)rval)->ins[6])))
539 rval = rval - STACK_BIAS;
545 /* Standard stuff. */
546 static inline void shift_window_buffer(int first_win, int last_win,
547 struct thread_info *t)
551 for (i = first_win; i < last_win; i++) {
552 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
553 memcpy(&t->reg_window[i], &t->reg_window[i+1],
554 sizeof(struct reg_window));
558 void synchronize_user_stack(void)
560 struct thread_info *t = current_thread_info();
561 unsigned long window;
563 flush_user_windows();
564 if ((window = get_thread_wsaved()) != 0) {
565 int winsize = sizeof(struct reg_window);
568 if (test_thread_flag(TIF_32BIT))
569 winsize = sizeof(struct reg_window32);
575 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
576 struct reg_window *rwin = &t->reg_window[window];
578 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
579 shift_window_buffer(window, get_thread_wsaved() - 1, t);
580 set_thread_wsaved(get_thread_wsaved() - 1);
586 static void stack_unaligned(unsigned long sp)
590 info.si_signo = SIGBUS;
592 info.si_code = BUS_ADRALN;
593 info.si_addr = (void __user *) sp;
595 force_sig_info(SIGBUS, &info, current);
598 void fault_in_user_windows(void)
600 struct thread_info *t = current_thread_info();
601 unsigned long window;
602 int winsize = sizeof(struct reg_window);
605 if (test_thread_flag(TIF_32BIT))
606 winsize = sizeof(struct reg_window32);
610 flush_user_windows();
611 window = get_thread_wsaved();
613 if (likely(window != 0)) {
616 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
617 struct reg_window *rwin = &t->reg_window[window];
619 if (unlikely(sp & 0x7UL))
622 if (unlikely(copy_to_user((char __user *)sp,
627 set_thread_wsaved(0);
631 set_thread_wsaved(window + 1);
635 asmlinkage long sparc_do_fork(unsigned long clone_flags,
636 unsigned long stack_start,
637 struct pt_regs *regs,
638 unsigned long stack_size)
640 int __user *parent_tid_ptr, *child_tid_ptr;
641 unsigned long orig_i1 = regs->u_regs[UREG_I1];
645 if (test_thread_flag(TIF_32BIT)) {
646 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
647 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
651 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
652 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
655 ret = do_fork(clone_flags, stack_start,
657 parent_tid_ptr, child_tid_ptr);
659 /* If we get an error and potentially restart the system
660 * call, we're screwed because copy_thread() clobbered
661 * the parent's %o1. So detect that case and restore it
664 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
665 regs->u_regs[UREG_I1] = orig_i1;
670 /* Copy a Sparc thread. The fork() return value conventions
671 * under SunOS are nothing short of bletcherous:
672 * Parent --> %o0 == childs pid, %o1 == 0
673 * Child --> %o0 == parents pid, %o1 == 1
675 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
676 unsigned long unused,
677 struct task_struct *p, struct pt_regs *regs)
679 struct thread_info *t = task_thread_info(p);
680 struct sparc_stackf *parent_sf;
681 unsigned long child_stack_sz;
682 char *child_trap_frame;
685 kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0;
686 parent_sf = ((struct sparc_stackf *) regs) - 1;
688 /* Calculate offset to stack_frame & pt_regs */
689 child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) +
690 (kernel_thread ? STACKFRAME_SZ : 0));
691 child_trap_frame = (task_stack_page(p) +
692 (THREAD_SIZE - child_stack_sz));
693 memcpy(child_trap_frame, parent_sf, child_stack_sz);
695 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) |
696 (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
697 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
699 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
700 t->kregs = (struct pt_regs *) (child_trap_frame +
701 sizeof(struct sparc_stackf));
705 struct sparc_stackf *child_sf = (struct sparc_stackf *)
706 (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ));
708 /* Zero terminate the stack backtrace. */
710 t->kregs->u_regs[UREG_FP] =
711 ((unsigned long) child_sf) - STACK_BIAS;
713 /* Special case, if we are spawning a kernel thread from
714 * a userspace task (usermode helper, NFS or similar), we
715 * must disable performance counters in the child because
716 * the address space and protection realm are changing.
718 if (t->flags & _TIF_PERFCTR) {
719 t->user_cntd0 = t->user_cntd1 = NULL;
721 t->flags &= ~_TIF_PERFCTR;
723 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
724 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
725 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
727 if (t->flags & _TIF_32BIT) {
728 sp &= 0x00000000ffffffffUL;
729 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
731 t->kregs->u_regs[UREG_FP] = sp;
732 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
733 if (sp != regs->u_regs[UREG_FP]) {
736 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
739 t->kregs->u_regs[UREG_FP] = csp;
745 /* Set the return value for the child. */
746 t->kregs->u_regs[UREG_I0] = current->pid;
747 t->kregs->u_regs[UREG_I1] = 1;
749 /* Set the second return value for the parent. */
750 regs->u_regs[UREG_I1] = 0;
752 if (clone_flags & CLONE_SETTLS)
753 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
759 * This is the mechanism for creating a new kernel thread.
761 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
762 * who haven't done an "execve()") should use this: it will work within
763 * a system call from a "real" process, but the process memory space will
764 * not be freed until both the parent and the child have exited.
766 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
770 /* If the parent runs before fn(arg) is called by the child,
771 * the input registers of this function can be clobbered.
772 * So we stash 'fn' and 'arg' into global registers which
773 * will not be modified by the parent.
775 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
776 "mov %5, %%g3\n\t" /* Save ARG into global */
777 "mov %1, %%g1\n\t" /* Clone syscall nr. */
778 "mov %2, %%o0\n\t" /* Clone flags. */
779 "mov 0, %%o1\n\t" /* usp arg == 0 */
780 "t 0x6d\n\t" /* Linux/Sparc clone(). */
781 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
783 "jmpl %%g2, %%o7\n\t" /* Call the function. */
784 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
786 "t 0x6d\n\t" /* Linux/Sparc exit(). */
787 /* Notreached by child. */
790 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
791 "i" (__NR_exit), "r" (fn), "r" (arg) :
792 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
798 unsigned int pr_regs[32];
799 unsigned long pr_dregs[16];
801 unsigned int __unused;
803 unsigned char pr_qcnt;
804 unsigned char pr_q_entrysize;
806 unsigned int pr_q[64];
810 * fill in the fpu structure for a core dump.
812 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
814 unsigned long *kfpregs = current_thread_info()->fpregs;
815 unsigned long fprs = current_thread_info()->fpsaved[0];
817 if (test_thread_flag(TIF_32BIT)) {
818 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
821 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
822 sizeof(unsigned int) * 32);
824 memset(&fpregs32->pr_fr.pr_regs[0], 0,
825 sizeof(unsigned int) * 32);
826 fpregs32->pr_qcnt = 0;
827 fpregs32->pr_q_entrysize = 8;
828 memset(&fpregs32->pr_q[0], 0,
829 (sizeof(unsigned int) * 64));
830 if (fprs & FPRS_FEF) {
831 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
834 fpregs32->pr_fsr = 0;
839 memcpy(&fpregs->pr_regs[0], kfpregs,
840 sizeof(unsigned int) * 32);
842 memset(&fpregs->pr_regs[0], 0,
843 sizeof(unsigned int) * 32);
845 memcpy(&fpregs->pr_regs[16], kfpregs+16,
846 sizeof(unsigned int) * 32);
848 memset(&fpregs->pr_regs[16], 0,
849 sizeof(unsigned int) * 32);
850 if(fprs & FPRS_FEF) {
851 fpregs->pr_fsr = current_thread_info()->xfsr[0];
852 fpregs->pr_gsr = current_thread_info()->gsr[0];
854 fpregs->pr_fsr = fpregs->pr_gsr = 0;
856 fpregs->pr_fprs = fprs;
862 * sparc_execve() executes a new program after the asm stub has set
863 * things up for us. This should basically do what I want it to.
865 asmlinkage int sparc_execve(struct pt_regs *regs)
870 /* User register window flush is done by entry.S */
872 /* Check for indirect call. */
873 if (regs->u_regs[UREG_G1] == 0)
876 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
877 error = PTR_ERR(filename);
878 if (IS_ERR(filename))
880 error = do_execve(filename,
881 (char __user * __user *)
882 regs->u_regs[base + UREG_I1],
883 (char __user * __user *)
884 regs->u_regs[base + UREG_I2], regs);
888 current_thread_info()->xfsr[0] = 0;
889 current_thread_info()->fpsaved[0] = 0;
890 regs->tstate &= ~TSTATE_PEF;
896 unsigned long get_wchan(struct task_struct *task)
898 unsigned long pc, fp, bias = 0;
899 unsigned long thread_info_base;
900 struct reg_window *rw;
901 unsigned long ret = 0;
904 if (!task || task == current ||
905 task->state == TASK_RUNNING)
908 thread_info_base = (unsigned long) task_stack_page(task);
910 fp = task_thread_info(task)->ksp + bias;
913 /* Bogus frame pointer? */
914 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
915 fp >= (thread_info_base + THREAD_SIZE))
917 rw = (struct reg_window *) fp;
919 if (!in_sched_functions(pc)) {
923 fp = rw->ins[6] + bias;
924 } while (++count < 16);