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TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/process_64.c

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  1 /*  arch/sparc64/kernel/process.c
  2  *
  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)
  6  */
  7 
  8 /*
  9  * This file handles the architecture-dependent parts of process handling..
 10  */
 11 
 12 #include <stdarg.h>
 13 
 14 #include <linux/errno.h>
 15 #include <linux/export.h>
 16 #include <linux/sched.h>
 17 #include <linux/sched/debug.h>
 18 #include <linux/sched/task.h>
 19 #include <linux/sched/task_stack.h>
 20 #include <linux/kernel.h>
 21 #include <linux/mm.h>
 22 #include <linux/fs.h>
 23 #include <linux/smp.h>
 24 #include <linux/stddef.h>
 25 #include <linux/ptrace.h>
 26 #include <linux/slab.h>
 27 #include <linux/user.h>
 28 #include <linux/delay.h>
 29 #include <linux/compat.h>
 30 #include <linux/tick.h>
 31 #include <linux/init.h>
 32 #include <linux/cpu.h>
 33 #include <linux/perf_event.h>
 34 #include <linux/elfcore.h>
 35 #include <linux/sysrq.h>
 36 #include <linux/nmi.h>
 37 #include <linux/context_tracking.h>
 38 
 39 #include <linux/uaccess.h>
 40 #include <asm/page.h>
 41 #include <asm/pgalloc.h>
 42 #include <asm/pgtable.h>
 43 #include <asm/processor.h>
 44 #include <asm/pstate.h>
 45 #include <asm/elf.h>
 46 #include <asm/fpumacro.h>
 47 #include <asm/head.h>
 48 #include <asm/cpudata.h>
 49 #include <asm/mmu_context.h>
 50 #include <asm/unistd.h>
 51 #include <asm/hypervisor.h>
 52 #include <asm/syscalls.h>
 53 #include <asm/irq_regs.h>
 54 #include <asm/smp.h>
 55 #include <asm/pcr.h>
 56 
 57 #include "kstack.h"
 58 
 59 /* Idle loop support on sparc64. */
 60 void arch_cpu_idle(void)
 61 {
 62         if (tlb_type != hypervisor) {
 63                 touch_nmi_watchdog();
 64                 local_irq_enable();
 65         } else {
 66                 unsigned long pstate;
 67 
 68                 local_irq_enable();
 69 
 70                 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
 71                  * the cpu sleep hypervisor call.
 72                  */
 73                 __asm__ __volatile__(
 74                         "rdpr %%pstate, %0\n\t"
 75                         "andn %0, %1, %0\n\t"
 76                         "wrpr %0, %%g0, %%pstate"
 77                         : "=&r" (pstate)
 78                         : "i" (PSTATE_IE));
 79 
 80                 if (!need_resched() && !cpu_is_offline(smp_processor_id()))
 81                         sun4v_cpu_yield();
 82 
 83                 /* Re-enable interrupts. */
 84                 __asm__ __volatile__(
 85                         "rdpr %%pstate, %0\n\t"
 86                         "or %0, %1, %0\n\t"
 87                         "wrpr %0, %%g0, %%pstate"
 88                         : "=&r" (pstate)
 89                         : "i" (PSTATE_IE));
 90         }
 91 }
 92 
 93 #ifdef CONFIG_HOTPLUG_CPU
 94 void arch_cpu_idle_dead(void)
 95 {
 96         sched_preempt_enable_no_resched();
 97         cpu_play_dead();
 98 }
 99 #endif
100 
101 #ifdef CONFIG_COMPAT
102 static void show_regwindow32(struct pt_regs *regs)
103 {
104         struct reg_window32 __user *rw;
105         struct reg_window32 r_w;
106         mm_segment_t old_fs;
107         
108         __asm__ __volatile__ ("flushw");
109         rw = compat_ptr((unsigned int)regs->u_regs[14]);
110         old_fs = get_fs();
111         set_fs (USER_DS);
112         if (copy_from_user (&r_w, rw, sizeof(r_w))) {
113                 set_fs (old_fs);
114                 return;
115         }
116 
117         set_fs (old_fs);                        
118         printk("l0: %08x l1: %08x l2: %08x l3: %08x "
119                "l4: %08x l5: %08x l6: %08x l7: %08x\n",
120                r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
121                r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
122         printk("i0: %08x i1: %08x i2: %08x i3: %08x "
123                "i4: %08x i5: %08x i6: %08x i7: %08x\n",
124                r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
125                r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
126 }
127 #else
128 #define show_regwindow32(regs)  do { } while (0)
129 #endif
130 
131 static void show_regwindow(struct pt_regs *regs)
132 {
133         struct reg_window __user *rw;
134         struct reg_window *rwk;
135         struct reg_window r_w;
136         mm_segment_t old_fs;
137 
138         if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
139                 __asm__ __volatile__ ("flushw");
140                 rw = (struct reg_window __user *)
141                         (regs->u_regs[14] + STACK_BIAS);
142                 rwk = (struct reg_window *)
143                         (regs->u_regs[14] + STACK_BIAS);
144                 if (!(regs->tstate & TSTATE_PRIV)) {
145                         old_fs = get_fs();
146                         set_fs (USER_DS);
147                         if (copy_from_user (&r_w, rw, sizeof(r_w))) {
148                                 set_fs (old_fs);
149                                 return;
150                         }
151                         rwk = &r_w;
152                         set_fs (old_fs);                        
153                 }
154         } else {
155                 show_regwindow32(regs);
156                 return;
157         }
158         printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
159                rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
160         printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
161                rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
162         printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
163                rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
164         printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
165                rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
166         if (regs->tstate & TSTATE_PRIV)
167                 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
168 }
169 
170 void show_regs(struct pt_regs *regs)
171 {
172         show_regs_print_info(KERN_DEFAULT);
173 
174         printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x    %s\n", regs->tstate,
175                regs->tpc, regs->tnpc, regs->y, print_tainted());
176         printk("TPC: <%pS>\n", (void *) regs->tpc);
177         printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
178                regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
179                regs->u_regs[3]);
180         printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
181                regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
182                regs->u_regs[7]);
183         printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
184                regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
185                regs->u_regs[11]);
186         printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
187                regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
188                regs->u_regs[15]);
189         printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
190         show_regwindow(regs);
191         show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
192 }
193 
194 union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
195 static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
196 
197 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
198                               int this_cpu)
199 {
200         struct global_reg_snapshot *rp;
201 
202         flushw_all();
203 
204         rp = &global_cpu_snapshot[this_cpu].reg;
205 
206         rp->tstate = regs->tstate;
207         rp->tpc = regs->tpc;
208         rp->tnpc = regs->tnpc;
209         rp->o7 = regs->u_regs[UREG_I7];
210 
211         if (regs->tstate & TSTATE_PRIV) {
212                 struct reg_window *rw;
213 
214                 rw = (struct reg_window *)
215                         (regs->u_regs[UREG_FP] + STACK_BIAS);
216                 if (kstack_valid(tp, (unsigned long) rw)) {
217                         rp->i7 = rw->ins[7];
218                         rw = (struct reg_window *)
219                                 (rw->ins[6] + STACK_BIAS);
220                         if (kstack_valid(tp, (unsigned long) rw))
221                                 rp->rpc = rw->ins[7];
222                 }
223         } else {
224                 rp->i7 = 0;
225                 rp->rpc = 0;
226         }
227         rp->thread = tp;
228 }
229 
230 /* In order to avoid hangs we do not try to synchronize with the
231  * global register dump client cpus.  The last store they make is to
232  * the thread pointer, so do a short poll waiting for that to become
233  * non-NULL.
234  */
235 static void __global_reg_poll(struct global_reg_snapshot *gp)
236 {
237         int limit = 0;
238 
239         while (!gp->thread && ++limit < 100) {
240                 barrier();
241                 udelay(1);
242         }
243 }
244 
245 void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
246 {
247         struct thread_info *tp = current_thread_info();
248         struct pt_regs *regs = get_irq_regs();
249         unsigned long flags;
250         int this_cpu, cpu;
251 
252         if (!regs)
253                 regs = tp->kregs;
254 
255         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
256 
257         this_cpu = raw_smp_processor_id();
258 
259         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
260 
261         if (cpumask_test_cpu(this_cpu, mask) && !exclude_self)
262                 __global_reg_self(tp, regs, this_cpu);
263 
264         smp_fetch_global_regs();
265 
266         for_each_cpu(cpu, mask) {
267                 struct global_reg_snapshot *gp;
268 
269                 if (exclude_self && cpu == this_cpu)
270                         continue;
271 
272                 gp = &global_cpu_snapshot[cpu].reg;
273 
274                 __global_reg_poll(gp);
275 
276                 tp = gp->thread;
277                 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
278                        (cpu == this_cpu ? '*' : ' '), cpu,
279                        gp->tstate, gp->tpc, gp->tnpc,
280                        ((tp && tp->task) ? tp->task->comm : "NULL"),
281                        ((tp && tp->task) ? tp->task->pid : -1));
282 
283                 if (gp->tstate & TSTATE_PRIV) {
284                         printk("             TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
285                                (void *) gp->tpc,
286                                (void *) gp->o7,
287                                (void *) gp->i7,
288                                (void *) gp->rpc);
289                 } else {
290                         printk("             TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
291                                gp->tpc, gp->o7, gp->i7, gp->rpc);
292                 }
293 
294                 touch_nmi_watchdog();
295         }
296 
297         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
298 
299         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
300 }
301 
302 #ifdef CONFIG_MAGIC_SYSRQ
303 
304 static void sysrq_handle_globreg(int key)
305 {
306         trigger_all_cpu_backtrace();
307 }
308 
309 static struct sysrq_key_op sparc_globalreg_op = {
310         .handler        = sysrq_handle_globreg,
311         .help_msg       = "global-regs(y)",
312         .action_msg     = "Show Global CPU Regs",
313 };
314 
315 static void __global_pmu_self(int this_cpu)
316 {
317         struct global_pmu_snapshot *pp;
318         int i, num;
319 
320         if (!pcr_ops)
321                 return;
322 
323         pp = &global_cpu_snapshot[this_cpu].pmu;
324 
325         num = 1;
326         if (tlb_type == hypervisor &&
327             sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
328                 num = 4;
329 
330         for (i = 0; i < num; i++) {
331                 pp->pcr[i] = pcr_ops->read_pcr(i);
332                 pp->pic[i] = pcr_ops->read_pic(i);
333         }
334 }
335 
336 static void __global_pmu_poll(struct global_pmu_snapshot *pp)
337 {
338         int limit = 0;
339 
340         while (!pp->pcr[0] && ++limit < 100) {
341                 barrier();
342                 udelay(1);
343         }
344 }
345 
346 static void pmu_snapshot_all_cpus(void)
347 {
348         unsigned long flags;
349         int this_cpu, cpu;
350 
351         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
352 
353         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
354 
355         this_cpu = raw_smp_processor_id();
356 
357         __global_pmu_self(this_cpu);
358 
359         smp_fetch_global_pmu();
360 
361         for_each_online_cpu(cpu) {
362                 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
363 
364                 __global_pmu_poll(pp);
365 
366                 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
367                        (cpu == this_cpu ? '*' : ' '), cpu,
368                        pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
369                        pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
370 
371                 touch_nmi_watchdog();
372         }
373 
374         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
375 
376         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
377 }
378 
379 static void sysrq_handle_globpmu(int key)
380 {
381         pmu_snapshot_all_cpus();
382 }
383 
384 static struct sysrq_key_op sparc_globalpmu_op = {
385         .handler        = sysrq_handle_globpmu,
386         .help_msg       = "global-pmu(x)",
387         .action_msg     = "Show Global PMU Regs",
388 };
389 
390 static int __init sparc_sysrq_init(void)
391 {
392         int ret = register_sysrq_key('y', &sparc_globalreg_op);
393 
394         if (!ret)
395                 ret = register_sysrq_key('x', &sparc_globalpmu_op);
396         return ret;
397 }
398 
399 core_initcall(sparc_sysrq_init);
400 
401 #endif
402 
403 /* Free current thread data structures etc.. */
404 void exit_thread(struct task_struct *tsk)
405 {
406         struct thread_info *t = task_thread_info(tsk);
407 
408         if (t->utraps) {
409                 if (t->utraps[0] < 2)
410                         kfree (t->utraps);
411                 else
412                         t->utraps[0]--;
413         }
414 }
415 
416 void flush_thread(void)
417 {
418         struct thread_info *t = current_thread_info();
419         struct mm_struct *mm;
420 
421         mm = t->task->mm;
422         if (mm)
423                 tsb_context_switch(mm);
424 
425         set_thread_wsaved(0);
426 
427         /* Clear FPU register state. */
428         t->fpsaved[0] = 0;
429 }
430 
431 /* It's a bit more tricky when 64-bit tasks are involved... */
432 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
433 {
434         bool stack_64bit = test_thread_64bit_stack(psp);
435         unsigned long fp, distance, rval;
436 
437         if (stack_64bit) {
438                 csp += STACK_BIAS;
439                 psp += STACK_BIAS;
440                 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
441                 fp += STACK_BIAS;
442                 if (test_thread_flag(TIF_32BIT))
443                         fp &= 0xffffffff;
444         } else
445                 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
446 
447         /* Now align the stack as this is mandatory in the Sparc ABI
448          * due to how register windows work.  This hides the
449          * restriction from thread libraries etc.
450          */
451         csp &= ~15UL;
452 
453         distance = fp - psp;
454         rval = (csp - distance);
455         if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
456                 rval = 0;
457         else if (!stack_64bit) {
458                 if (put_user(((u32)csp),
459                              &(((struct reg_window32 __user *)rval)->ins[6])))
460                         rval = 0;
461         } else {
462                 if (put_user(((u64)csp - STACK_BIAS),
463                              &(((struct reg_window __user *)rval)->ins[6])))
464                         rval = 0;
465                 else
466                         rval = rval - STACK_BIAS;
467         }
468 
469         return rval;
470 }
471 
472 /* Standard stuff. */
473 static inline void shift_window_buffer(int first_win, int last_win,
474                                        struct thread_info *t)
475 {
476         int i;
477 
478         for (i = first_win; i < last_win; i++) {
479                 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
480                 memcpy(&t->reg_window[i], &t->reg_window[i+1],
481                        sizeof(struct reg_window));
482         }
483 }
484 
485 void synchronize_user_stack(void)
486 {
487         struct thread_info *t = current_thread_info();
488         unsigned long window;
489 
490         flush_user_windows();
491         if ((window = get_thread_wsaved()) != 0) {
492                 window -= 1;
493                 do {
494                         struct reg_window *rwin = &t->reg_window[window];
495                         int winsize = sizeof(struct reg_window);
496                         unsigned long sp;
497 
498                         sp = t->rwbuf_stkptrs[window];
499 
500                         if (test_thread_64bit_stack(sp))
501                                 sp += STACK_BIAS;
502                         else
503                                 winsize = sizeof(struct reg_window32);
504 
505                         if (!copy_to_user((char __user *)sp, rwin, winsize)) {
506                                 shift_window_buffer(window, get_thread_wsaved() - 1, t);
507                                 set_thread_wsaved(get_thread_wsaved() - 1);
508                         }
509                 } while (window--);
510         }
511 }
512 
513 static void stack_unaligned(unsigned long sp)
514 {
515         siginfo_t info;
516 
517         info.si_signo = SIGBUS;
518         info.si_errno = 0;
519         info.si_code = BUS_ADRALN;
520         info.si_addr = (void __user *) sp;
521         info.si_trapno = 0;
522         force_sig_info(SIGBUS, &info, current);
523 }
524 
525 void fault_in_user_windows(void)
526 {
527         struct thread_info *t = current_thread_info();
528         unsigned long window;
529 
530         flush_user_windows();
531         window = get_thread_wsaved();
532 
533         if (likely(window != 0)) {
534                 window -= 1;
535                 do {
536                         struct reg_window *rwin = &t->reg_window[window];
537                         int winsize = sizeof(struct reg_window);
538                         unsigned long sp;
539 
540                         sp = t->rwbuf_stkptrs[window];
541 
542                         if (test_thread_64bit_stack(sp))
543                                 sp += STACK_BIAS;
544                         else
545                                 winsize = sizeof(struct reg_window32);
546 
547                         if (unlikely(sp & 0x7UL))
548                                 stack_unaligned(sp);
549 
550                         if (unlikely(copy_to_user((char __user *)sp,
551                                                   rwin, winsize)))
552                                 goto barf;
553                 } while (window--);
554         }
555         set_thread_wsaved(0);
556         return;
557 
558 barf:
559         set_thread_wsaved(window + 1);
560         user_exit();
561         do_exit(SIGILL);
562 }
563 
564 asmlinkage long sparc_do_fork(unsigned long clone_flags,
565                               unsigned long stack_start,
566                               struct pt_regs *regs,
567                               unsigned long stack_size)
568 {
569         int __user *parent_tid_ptr, *child_tid_ptr;
570         unsigned long orig_i1 = regs->u_regs[UREG_I1];
571         long ret;
572 
573 #ifdef CONFIG_COMPAT
574         if (test_thread_flag(TIF_32BIT)) {
575                 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
576                 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
577         } else
578 #endif
579         {
580                 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
581                 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
582         }
583 
584         ret = do_fork(clone_flags, stack_start, stack_size,
585                       parent_tid_ptr, child_tid_ptr);
586 
587         /* If we get an error and potentially restart the system
588          * call, we're screwed because copy_thread() clobbered
589          * the parent's %o1.  So detect that case and restore it
590          * here.
591          */
592         if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
593                 regs->u_regs[UREG_I1] = orig_i1;
594 
595         return ret;
596 }
597 
598 /* Copy a Sparc thread.  The fork() return value conventions
599  * under SunOS are nothing short of bletcherous:
600  * Parent -->  %o0 == childs  pid, %o1 == 0
601  * Child  -->  %o0 == parents pid, %o1 == 1
602  */
603 int copy_thread(unsigned long clone_flags, unsigned long sp,
604                 unsigned long arg, struct task_struct *p)
605 {
606         struct thread_info *t = task_thread_info(p);
607         struct pt_regs *regs = current_pt_regs();
608         struct sparc_stackf *parent_sf;
609         unsigned long child_stack_sz;
610         char *child_trap_frame;
611 
612         /* Calculate offset to stack_frame & pt_regs */
613         child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
614         child_trap_frame = (task_stack_page(p) +
615                             (THREAD_SIZE - child_stack_sz));
616 
617         t->new_child = 1;
618         t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
619         t->kregs = (struct pt_regs *) (child_trap_frame +
620                                        sizeof(struct sparc_stackf));
621         t->fpsaved[0] = 0;
622 
623         if (unlikely(p->flags & PF_KTHREAD)) {
624                 memset(child_trap_frame, 0, child_stack_sz);
625                 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = 
626                         (current_pt_regs()->tstate + 1) & TSTATE_CWP;
627                 t->current_ds = ASI_P;
628                 t->kregs->u_regs[UREG_G1] = sp; /* function */
629                 t->kregs->u_regs[UREG_G2] = arg;
630                 return 0;
631         }
632 
633         parent_sf = ((struct sparc_stackf *) regs) - 1;
634         memcpy(child_trap_frame, parent_sf, child_stack_sz);
635         if (t->flags & _TIF_32BIT) {
636                 sp &= 0x00000000ffffffffUL;
637                 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
638         }
639         t->kregs->u_regs[UREG_FP] = sp;
640         __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = 
641                 (regs->tstate + 1) & TSTATE_CWP;
642         t->current_ds = ASI_AIUS;
643         if (sp != regs->u_regs[UREG_FP]) {
644                 unsigned long csp;
645 
646                 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
647                 if (!csp)
648                         return -EFAULT;
649                 t->kregs->u_regs[UREG_FP] = csp;
650         }
651         if (t->utraps)
652                 t->utraps[0]++;
653 
654         /* Set the return value for the child. */
655         t->kregs->u_regs[UREG_I0] = current->pid;
656         t->kregs->u_regs[UREG_I1] = 1;
657 
658         /* Set the second return value for the parent. */
659         regs->u_regs[UREG_I1] = 0;
660 
661         if (clone_flags & CLONE_SETTLS)
662                 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
663 
664         return 0;
665 }
666 
667 typedef struct {
668         union {
669                 unsigned int    pr_regs[32];
670                 unsigned long   pr_dregs[16];
671         } pr_fr;
672         unsigned int __unused;
673         unsigned int    pr_fsr;
674         unsigned char   pr_qcnt;
675         unsigned char   pr_q_entrysize;
676         unsigned char   pr_en;
677         unsigned int    pr_q[64];
678 } elf_fpregset_t32;
679 
680 /*
681  * fill in the fpu structure for a core dump.
682  */
683 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
684 {
685         unsigned long *kfpregs = current_thread_info()->fpregs;
686         unsigned long fprs = current_thread_info()->fpsaved[0];
687 
688         if (test_thread_flag(TIF_32BIT)) {
689                 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
690 
691                 if (fprs & FPRS_DL)
692                         memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
693                                sizeof(unsigned int) * 32);
694                 else
695                         memset(&fpregs32->pr_fr.pr_regs[0], 0,
696                                sizeof(unsigned int) * 32);
697                 fpregs32->pr_qcnt = 0;
698                 fpregs32->pr_q_entrysize = 8;
699                 memset(&fpregs32->pr_q[0], 0,
700                        (sizeof(unsigned int) * 64));
701                 if (fprs & FPRS_FEF) {
702                         fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
703                         fpregs32->pr_en = 1;
704                 } else {
705                         fpregs32->pr_fsr = 0;
706                         fpregs32->pr_en = 0;
707                 }
708         } else {
709                 if(fprs & FPRS_DL)
710                         memcpy(&fpregs->pr_regs[0], kfpregs,
711                                sizeof(unsigned int) * 32);
712                 else
713                         memset(&fpregs->pr_regs[0], 0,
714                                sizeof(unsigned int) * 32);
715                 if(fprs & FPRS_DU)
716                         memcpy(&fpregs->pr_regs[16], kfpregs+16,
717                                sizeof(unsigned int) * 32);
718                 else
719                         memset(&fpregs->pr_regs[16], 0,
720                                sizeof(unsigned int) * 32);
721                 if(fprs & FPRS_FEF) {
722                         fpregs->pr_fsr = current_thread_info()->xfsr[0];
723                         fpregs->pr_gsr = current_thread_info()->gsr[0];
724                 } else {
725                         fpregs->pr_fsr = fpregs->pr_gsr = 0;
726                 }
727                 fpregs->pr_fprs = fprs;
728         }
729         return 1;
730 }
731 EXPORT_SYMBOL(dump_fpu);
732 
733 unsigned long get_wchan(struct task_struct *task)
734 {
735         unsigned long pc, fp, bias = 0;
736         struct thread_info *tp;
737         struct reg_window *rw;
738         unsigned long ret = 0;
739         int count = 0; 
740 
741         if (!task || task == current ||
742             task->state == TASK_RUNNING)
743                 goto out;
744 
745         tp = task_thread_info(task);
746         bias = STACK_BIAS;
747         fp = task_thread_info(task)->ksp + bias;
748 
749         do {
750                 if (!kstack_valid(tp, fp))
751                         break;
752                 rw = (struct reg_window *) fp;
753                 pc = rw->ins[7];
754                 if (!in_sched_functions(pc)) {
755                         ret = pc;
756                         goto out;
757                 }
758                 fp = rw->ins[6] + bias;
759         } while (++count < 16);
760 
761 out:
762         return ret;
763 }
764 

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