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sparc64: Implement HAVE_CONTEXT_TRACKING
[deliverable/linux.git] / arch / sparc / kernel / process_64.c
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/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/fs.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/perf_event.h>
31 #include <linux/elfcore.h>
32 #include <linux/sysrq.h>
33 #include <linux/nmi.h>
34 #include <linux/context_tracking.h>
35
36 #include <asm/uaccess.h>
37 #include <asm/page.h>
38 #include <asm/pgalloc.h>
39 #include <asm/pgtable.h>
40 #include <asm/processor.h>
41 #include <asm/pstate.h>
42 #include <asm/elf.h>
43 #include <asm/fpumacro.h>
44 #include <asm/head.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/syscalls.h>
50 #include <asm/irq_regs.h>
51 #include <asm/smp.h>
52 #include <asm/pcr.h>
53
54 #include "kstack.h"
55
56 /* Idle loop support on sparc64. */
57 void arch_cpu_idle(void)
58 {
59 if (tlb_type != hypervisor) {
60 touch_nmi_watchdog();
61 } else {
62 unsigned long pstate;
63
64 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
65 * the cpu sleep hypervisor call.
66 */
67 __asm__ __volatile__(
68 "rdpr %%pstate, %0\n\t"
69 "andn %0, %1, %0\n\t"
70 "wrpr %0, %%g0, %%pstate"
71 : "=&r" (pstate)
72 : "i" (PSTATE_IE));
73
74 if (!need_resched() && !cpu_is_offline(smp_processor_id()))
75 sun4v_cpu_yield();
76
77 /* Re-enable interrupts. */
78 __asm__ __volatile__(
79 "rdpr %%pstate, %0\n\t"
80 "or %0, %1, %0\n\t"
81 "wrpr %0, %%g0, %%pstate"
82 : "=&r" (pstate)
83 : "i" (PSTATE_IE));
84 }
85 local_irq_enable();
86 }
87
88 #ifdef CONFIG_HOTPLUG_CPU
89 void arch_cpu_idle_dead()
90 {
91 sched_preempt_enable_no_resched();
92 cpu_play_dead();
93 }
94 #endif
95
96 #ifdef CONFIG_COMPAT
97 static void show_regwindow32(struct pt_regs *regs)
98 {
99 struct reg_window32 __user *rw;
100 struct reg_window32 r_w;
101 mm_segment_t old_fs;
102
103 __asm__ __volatile__ ("flushw");
104 rw = compat_ptr((unsigned)regs->u_regs[14]);
105 old_fs = get_fs();
106 set_fs (USER_DS);
107 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
108 set_fs (old_fs);
109 return;
110 }
111
112 set_fs (old_fs);
113 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
114 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
115 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
116 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
117 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
118 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
119 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
120 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
121 }
122 #else
123 #define show_regwindow32(regs) do { } while (0)
124 #endif
125
126 static void show_regwindow(struct pt_regs *regs)
127 {
128 struct reg_window __user *rw;
129 struct reg_window *rwk;
130 struct reg_window r_w;
131 mm_segment_t old_fs;
132
133 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
134 __asm__ __volatile__ ("flushw");
135 rw = (struct reg_window __user *)
136 (regs->u_regs[14] + STACK_BIAS);
137 rwk = (struct reg_window *)
138 (regs->u_regs[14] + STACK_BIAS);
139 if (!(regs->tstate & TSTATE_PRIV)) {
140 old_fs = get_fs();
141 set_fs (USER_DS);
142 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
143 set_fs (old_fs);
144 return;
145 }
146 rwk = &r_w;
147 set_fs (old_fs);
148 }
149 } else {
150 show_regwindow32(regs);
151 return;
152 }
153 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
154 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
155 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
156 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
157 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
158 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
159 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
160 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
161 if (regs->tstate & TSTATE_PRIV)
162 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
163 }
164
165 void show_regs(struct pt_regs *regs)
166 {
167 show_regs_print_info(KERN_DEFAULT);
168
169 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
170 regs->tpc, regs->tnpc, regs->y, print_tainted());
171 printk("TPC: <%pS>\n", (void *) regs->tpc);
172 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
173 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
174 regs->u_regs[3]);
175 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
176 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
177 regs->u_regs[7]);
178 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
179 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
180 regs->u_regs[11]);
181 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
182 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
183 regs->u_regs[15]);
184 printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
185 show_regwindow(regs);
186 show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
187 }
188
189 union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
190 static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
191
192 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
193 int this_cpu)
194 {
195 struct global_reg_snapshot *rp;
196
197 flushw_all();
198
199 rp = &global_cpu_snapshot[this_cpu].reg;
200
201 rp->tstate = regs->tstate;
202 rp->tpc = regs->tpc;
203 rp->tnpc = regs->tnpc;
204 rp->o7 = regs->u_regs[UREG_I7];
205
206 if (regs->tstate & TSTATE_PRIV) {
207 struct reg_window *rw;
208
209 rw = (struct reg_window *)
210 (regs->u_regs[UREG_FP] + STACK_BIAS);
211 if (kstack_valid(tp, (unsigned long) rw)) {
212 rp->i7 = rw->ins[7];
213 rw = (struct reg_window *)
214 (rw->ins[6] + STACK_BIAS);
215 if (kstack_valid(tp, (unsigned long) rw))
216 rp->rpc = rw->ins[7];
217 }
218 } else {
219 rp->i7 = 0;
220 rp->rpc = 0;
221 }
222 rp->thread = tp;
223 }
224
225 /* In order to avoid hangs we do not try to synchronize with the
226 * global register dump client cpus. The last store they make is to
227 * the thread pointer, so do a short poll waiting for that to become
228 * non-NULL.
229 */
230 static void __global_reg_poll(struct global_reg_snapshot *gp)
231 {
232 int limit = 0;
233
234 while (!gp->thread && ++limit < 100) {
235 barrier();
236 udelay(1);
237 }
238 }
239
240 void arch_trigger_all_cpu_backtrace(void)
241 {
242 struct thread_info *tp = current_thread_info();
243 struct pt_regs *regs = get_irq_regs();
244 unsigned long flags;
245 int this_cpu, cpu;
246
247 if (!regs)
248 regs = tp->kregs;
249
250 spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
251
252 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
253
254 this_cpu = raw_smp_processor_id();
255
256 __global_reg_self(tp, regs, this_cpu);
257
258 smp_fetch_global_regs();
259
260 for_each_online_cpu(cpu) {
261 struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
262
263 __global_reg_poll(gp);
264
265 tp = gp->thread;
266 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
267 (cpu == this_cpu ? '*' : ' '), cpu,
268 gp->tstate, gp->tpc, gp->tnpc,
269 ((tp && tp->task) ? tp->task->comm : "NULL"),
270 ((tp && tp->task) ? tp->task->pid : -1));
271
272 if (gp->tstate & TSTATE_PRIV) {
273 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
274 (void *) gp->tpc,
275 (void *) gp->o7,
276 (void *) gp->i7,
277 (void *) gp->rpc);
278 } else {
279 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
280 gp->tpc, gp->o7, gp->i7, gp->rpc);
281 }
282 }
283
284 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
285
286 spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
287 }
288
289 #ifdef CONFIG_MAGIC_SYSRQ
290
291 static void sysrq_handle_globreg(int key)
292 {
293 arch_trigger_all_cpu_backtrace();
294 }
295
296 static struct sysrq_key_op sparc_globalreg_op = {
297 .handler = sysrq_handle_globreg,
298 .help_msg = "global-regs(y)",
299 .action_msg = "Show Global CPU Regs",
300 };
301
302 static void __global_pmu_self(int this_cpu)
303 {
304 struct global_pmu_snapshot *pp;
305 int i, num;
306
307 pp = &global_cpu_snapshot[this_cpu].pmu;
308
309 num = 1;
310 if (tlb_type == hypervisor &&
311 sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
312 num = 4;
313
314 for (i = 0; i < num; i++) {
315 pp->pcr[i] = pcr_ops->read_pcr(i);
316 pp->pic[i] = pcr_ops->read_pic(i);
317 }
318 }
319
320 static void __global_pmu_poll(struct global_pmu_snapshot *pp)
321 {
322 int limit = 0;
323
324 while (!pp->pcr[0] && ++limit < 100) {
325 barrier();
326 udelay(1);
327 }
328 }
329
330 static void pmu_snapshot_all_cpus(void)
331 {
332 unsigned long flags;
333 int this_cpu, cpu;
334
335 spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
336
337 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
338
339 this_cpu = raw_smp_processor_id();
340
341 __global_pmu_self(this_cpu);
342
343 smp_fetch_global_pmu();
344
345 for_each_online_cpu(cpu) {
346 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
347
348 __global_pmu_poll(pp);
349
350 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
351 (cpu == this_cpu ? '*' : ' '), cpu,
352 pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
353 pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
354 }
355
356 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
357
358 spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
359 }
360
361 static void sysrq_handle_globpmu(int key)
362 {
363 pmu_snapshot_all_cpus();
364 }
365
366 static struct sysrq_key_op sparc_globalpmu_op = {
367 .handler = sysrq_handle_globpmu,
368 .help_msg = "global-pmu(x)",
369 .action_msg = "Show Global PMU Regs",
370 };
371
372 static int __init sparc_sysrq_init(void)
373 {
374 int ret = register_sysrq_key('y', &sparc_globalreg_op);
375
376 if (!ret)
377 ret = register_sysrq_key('x', &sparc_globalpmu_op);
378 return ret;
379 }
380
381 core_initcall(sparc_sysrq_init);
382
383 #endif
384
385 unsigned long thread_saved_pc(struct task_struct *tsk)
386 {
387 struct thread_info *ti = task_thread_info(tsk);
388 unsigned long ret = 0xdeadbeefUL;
389
390 if (ti && ti->ksp) {
391 unsigned long *sp;
392 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
393 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
394 sp[14]) {
395 unsigned long *fp;
396 fp = (unsigned long *)(sp[14] + STACK_BIAS);
397 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
398 ret = fp[15];
399 }
400 }
401 return ret;
402 }
403
404 /* Free current thread data structures etc.. */
405 void exit_thread(void)
406 {
407 struct thread_info *t = current_thread_info();
408
409 if (t->utraps) {
410 if (t->utraps[0] < 2)
411 kfree (t->utraps);
412 else
413 t->utraps[0]--;
414 }
415 }
416
417 void flush_thread(void)
418 {
419 struct thread_info *t = current_thread_info();
420 struct mm_struct *mm;
421
422 mm = t->task->mm;
423 if (mm)
424 tsb_context_switch(mm);
425
426 set_thread_wsaved(0);
427
428 /* Clear FPU register state. */
429 t->fpsaved[0] = 0;
430 }
431
432 /* It's a bit more tricky when 64-bit tasks are involved... */
433 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
434 {
435 bool stack_64bit = test_thread_64bit_stack(psp);
436 unsigned long fp, distance, rval;
437
438 if (stack_64bit) {
439 csp += STACK_BIAS;
440 psp += STACK_BIAS;
441 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
442 fp += STACK_BIAS;
443 if (test_thread_flag(TIF_32BIT))
444 fp &= 0xffffffff;
445 } else
446 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
447
448 /* Now align the stack as this is mandatory in the Sparc ABI
449 * due to how register windows work. This hides the
450 * restriction from thread libraries etc.
451 */
452 csp &= ~15UL;
453
454 distance = fp - psp;
455 rval = (csp - distance);
456 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
457 rval = 0;
458 else if (!stack_64bit) {
459 if (put_user(((u32)csp),
460 &(((struct reg_window32 __user *)rval)->ins[6])))
461 rval = 0;
462 } else {
463 if (put_user(((u64)csp - STACK_BIAS),
464 &(((struct reg_window __user *)rval)->ins[6])))
465 rval = 0;
466 else
467 rval = rval - STACK_BIAS;
468 }
469
470 return rval;
471 }
472
473 /* Standard stuff. */
474 static inline void shift_window_buffer(int first_win, int last_win,
475 struct thread_info *t)
476 {
477 int i;
478
479 for (i = first_win; i < last_win; i++) {
480 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
481 memcpy(&t->reg_window[i], &t->reg_window[i+1],
482 sizeof(struct reg_window));
483 }
484 }
485
486 void synchronize_user_stack(void)
487 {
488 struct thread_info *t = current_thread_info();
489 unsigned long window;
490
491 flush_user_windows();
492 if ((window = get_thread_wsaved()) != 0) {
493 window -= 1;
494 do {
495 struct reg_window *rwin = &t->reg_window[window];
496 int winsize = sizeof(struct reg_window);
497 unsigned long sp;
498
499 sp = t->rwbuf_stkptrs[window];
500
501 if (test_thread_64bit_stack(sp))
502 sp += STACK_BIAS;
503 else
504 winsize = sizeof(struct reg_window32);
505
506 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
507 shift_window_buffer(window, get_thread_wsaved() - 1, t);
508 set_thread_wsaved(get_thread_wsaved() - 1);
509 }
510 } while (window--);
511 }
512 }
513
514 static void stack_unaligned(unsigned long sp)
515 {
516 siginfo_t info;
517
518 info.si_signo = SIGBUS;
519 info.si_errno = 0;
520 info.si_code = BUS_ADRALN;
521 info.si_addr = (void __user *) sp;
522 info.si_trapno = 0;
523 force_sig_info(SIGBUS, &info, current);
524 }
525
526 void fault_in_user_windows(void)
527 {
528 struct thread_info *t = current_thread_info();
529 unsigned long window;
530
531 flush_user_windows();
532 window = get_thread_wsaved();
533
534 if (likely(window != 0)) {
535 window -= 1;
536 do {
537 struct reg_window *rwin = &t->reg_window[window];
538 int winsize = sizeof(struct reg_window);
539 unsigned long sp;
540
541 sp = t->rwbuf_stkptrs[window];
542
543 if (test_thread_64bit_stack(sp))
544 sp += STACK_BIAS;
545 else
546 winsize = sizeof(struct reg_window32);
547
548 if (unlikely(sp & 0x7UL))
549 stack_unaligned(sp);
550
551 if (unlikely(copy_to_user((char __user *)sp,
552 rwin, winsize)))
553 goto barf;
554 } while (window--);
555 }
556 set_thread_wsaved(0);
557 return;
558
559 barf:
560 set_thread_wsaved(window + 1);
561 user_exit();
562 do_exit(SIGILL);
563 }
564
565 asmlinkage long sparc_do_fork(unsigned long clone_flags,
566 unsigned long stack_start,
567 struct pt_regs *regs,
568 unsigned long stack_size)
569 {
570 int __user *parent_tid_ptr, *child_tid_ptr;
571 unsigned long orig_i1 = regs->u_regs[UREG_I1];
572 long ret;
573
574 #ifdef CONFIG_COMPAT
575 if (test_thread_flag(TIF_32BIT)) {
576 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
577 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
578 } else
579 #endif
580 {
581 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
582 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
583 }
584
585 ret = do_fork(clone_flags, stack_start, stack_size,
586 parent_tid_ptr, child_tid_ptr);
587
588 /* If we get an error and potentially restart the system
589 * call, we're screwed because copy_thread() clobbered
590 * the parent's %o1. So detect that case and restore it
591 * here.
592 */
593 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
594 regs->u_regs[UREG_I1] = orig_i1;
595
596 return ret;
597 }
598
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
603 */
604 int copy_thread(unsigned long clone_flags, unsigned long sp,
605 unsigned long arg, struct task_struct *p)
606 {
607 struct thread_info *t = task_thread_info(p);
608 struct pt_regs *regs = current_pt_regs();
609 struct sparc_stackf *parent_sf;
610 unsigned long child_stack_sz;
611 char *child_trap_frame;
612
613 /* Calculate offset to stack_frame & pt_regs */
614 child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
615 child_trap_frame = (task_stack_page(p) +
616 (THREAD_SIZE - child_stack_sz));
617
618 t->new_child = 1;
619 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
620 t->kregs = (struct pt_regs *) (child_trap_frame +
621 sizeof(struct sparc_stackf));
622 t->fpsaved[0] = 0;
623
624 if (unlikely(p->flags & PF_KTHREAD)) {
625 memset(child_trap_frame, 0, child_stack_sz);
626 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
627 (current_pt_regs()->tstate + 1) & TSTATE_CWP;
628 t->current_ds = ASI_P;
629 t->kregs->u_regs[UREG_G1] = sp; /* function */
630 t->kregs->u_regs[UREG_G2] = arg;
631 return 0;
632 }
633
634 parent_sf = ((struct sparc_stackf *) regs) - 1;
635 memcpy(child_trap_frame, parent_sf, child_stack_sz);
636 if (t->flags & _TIF_32BIT) {
637 sp &= 0x00000000ffffffffUL;
638 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
639 }
640 t->kregs->u_regs[UREG_FP] = sp;
641 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
642 (regs->tstate + 1) & TSTATE_CWP;
643 t->current_ds = ASI_AIUS;
644 if (sp != regs->u_regs[UREG_FP]) {
645 unsigned long csp;
646
647 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
648 if (!csp)
649 return -EFAULT;
650 t->kregs->u_regs[UREG_FP] = csp;
651 }
652 if (t->utraps)
653 t->utraps[0]++;
654
655 /* Set the return value for the child. */
656 t->kregs->u_regs[UREG_I0] = current->pid;
657 t->kregs->u_regs[UREG_I1] = 1;
658
659 /* Set the second return value for the parent. */
660 regs->u_regs[UREG_I1] = 0;
661
662 if (clone_flags & CLONE_SETTLS)
663 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
664
665 return 0;
666 }
667
668 typedef struct {
669 union {
670 unsigned int pr_regs[32];
671 unsigned long pr_dregs[16];
672 } pr_fr;
673 unsigned int __unused;
674 unsigned int pr_fsr;
675 unsigned char pr_qcnt;
676 unsigned char pr_q_entrysize;
677 unsigned char pr_en;
678 unsigned int pr_q[64];
679 } elf_fpregset_t32;
680
681 /*
682 * fill in the fpu structure for a core dump.
683 */
684 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
685 {
686 unsigned long *kfpregs = current_thread_info()->fpregs;
687 unsigned long fprs = current_thread_info()->fpsaved[0];
688
689 if (test_thread_flag(TIF_32BIT)) {
690 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
691
692 if (fprs & FPRS_DL)
693 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
694 sizeof(unsigned int) * 32);
695 else
696 memset(&fpregs32->pr_fr.pr_regs[0], 0,
697 sizeof(unsigned int) * 32);
698 fpregs32->pr_qcnt = 0;
699 fpregs32->pr_q_entrysize = 8;
700 memset(&fpregs32->pr_q[0], 0,
701 (sizeof(unsigned int) * 64));
702 if (fprs & FPRS_FEF) {
703 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
704 fpregs32->pr_en = 1;
705 } else {
706 fpregs32->pr_fsr = 0;
707 fpregs32->pr_en = 0;
708 }
709 } else {
710 if(fprs & FPRS_DL)
711 memcpy(&fpregs->pr_regs[0], kfpregs,
712 sizeof(unsigned int) * 32);
713 else
714 memset(&fpregs->pr_regs[0], 0,
715 sizeof(unsigned int) * 32);
716 if(fprs & FPRS_DU)
717 memcpy(&fpregs->pr_regs[16], kfpregs+16,
718 sizeof(unsigned int) * 32);
719 else
720 memset(&fpregs->pr_regs[16], 0,
721 sizeof(unsigned int) * 32);
722 if(fprs & FPRS_FEF) {
723 fpregs->pr_fsr = current_thread_info()->xfsr[0];
724 fpregs->pr_gsr = current_thread_info()->gsr[0];
725 } else {
726 fpregs->pr_fsr = fpregs->pr_gsr = 0;
727 }
728 fpregs->pr_fprs = fprs;
729 }
730 return 1;
731 }
732 EXPORT_SYMBOL(dump_fpu);
733
734 unsigned long get_wchan(struct task_struct *task)
735 {
736 unsigned long pc, fp, bias = 0;
737 struct thread_info *tp;
738 struct reg_window *rw;
739 unsigned long ret = 0;
740 int count = 0;
741
742 if (!task || task == current ||
743 task->state == TASK_RUNNING)
744 goto out;
745
746 tp = task_thread_info(task);
747 bias = STACK_BIAS;
748 fp = task_thread_info(task)->ksp + bias;
749
750 do {
751 if (!kstack_valid(tp, fp))
752 break;
753 rw = (struct reg_window *) fp;
754 pc = rw->ins[7];
755 if (!in_sched_functions(pc)) {
756 ret = pc;
757 goto out;
758 }
759 fp = rw->ins[6] + bias;
760 } while (++count < 16);
761
762 out:
763 return ret;
764 }
Linux kernel - Deliverables
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