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1// SPDX-License-Identifier: GPL-2.0
2/* arch/sparc64/kernel/process.c
3 *
4 * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8
9/*
10 * This file handles the architecture-dependent parts of process handling..
11 */
12#include <linux/errno.h>
13#include <linux/export.h>
14#include <linux/sched.h>
15#include <linux/sched/debug.h>
16#include <linux/sched/task.h>
17#include <linux/sched/task_stack.h>
18#include <linux/kernel.h>
19#include <linux/mm.h>
20#include <linux/fs.h>
21#include <linux/smp.h>
22#include <linux/stddef.h>
23#include <linux/ptrace.h>
24#include <linux/slab.h>
25#include <linux/user.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/perf_event.h>
32#include <linux/elfcore.h>
33#include <linux/sysrq.h>
34#include <linux/nmi.h>
35#include <linux/context_tracking.h>
36#include <linux/signal.h>
37
38#include <linux/uaccess.h>
39#include <asm/page.h>
40#include <asm/pgalloc.h>
41#include <asm/processor.h>
42#include <asm/pstate.h>
43#include <asm/elf.h>
44#include <asm/fpumacro.h>
45#include <asm/head.h>
46#include <asm/cpudata.h>
47#include <asm/mmu_context.h>
48#include <asm/unistd.h>
49#include <asm/hypervisor.h>
50#include <asm/syscalls.h>
51#include <asm/irq_regs.h>
52#include <asm/smp.h>
53#include <asm/pcr.h>
54
55#include "kstack.h"
56
57/* Idle loop support on sparc64. */
58void arch_cpu_idle(void)
59{
60 if (tlb_type != hypervisor) {
61 touch_nmi_watchdog();
62 raw_local_irq_enable();
63 } else {
64 unsigned long pstate;
65
66 raw_local_irq_enable();
67
68 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
69 * the cpu sleep hypervisor call.
70 */
71 __asm__ __volatile__(
72 "rdpr %%pstate, %0\n\t"
73 "andn %0, %1, %0\n\t"
74 "wrpr %0, %%g0, %%pstate"
75 : "=&r" (pstate)
76 : "i" (PSTATE_IE));
77
78 if (!need_resched() && !cpu_is_offline(smp_processor_id())) {
79 sun4v_cpu_yield();
80 /* If resumed by cpu_poke then we need to explicitly
81 * call scheduler_ipi().
82 */
83 scheduler_poke();
84 }
85
86 /* Re-enable interrupts. */
87 __asm__ __volatile__(
88 "rdpr %%pstate, %0\n\t"
89 "or %0, %1, %0\n\t"
90 "wrpr %0, %%g0, %%pstate"
91 : "=&r" (pstate)
92 : "i" (PSTATE_IE));
93 }
94}
95
96#ifdef CONFIG_HOTPLUG_CPU
97void arch_cpu_idle_dead(void)
98{
99 sched_preempt_enable_no_resched();
100 cpu_play_dead();
101}
102#endif
103
104#ifdef CONFIG_COMPAT
105static void show_regwindow32(struct pt_regs *regs)
106{
107 struct reg_window32 __user *rw;
108 struct reg_window32 r_w;
109
110 __asm__ __volatile__ ("flushw");
111 rw = compat_ptr((unsigned int)regs->u_regs[14]);
112 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
113 return;
114 }
115
116 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
117 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
118 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
119 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
120 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
121 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
122 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
123 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
124}
125#else
126#define show_regwindow32(regs) do { } while (0)
127#endif
128
129static void show_regwindow(struct pt_regs *regs)
130{
131 struct reg_window __user *rw;
132 struct reg_window *rwk;
133 struct reg_window r_w;
134
135 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
136 __asm__ __volatile__ ("flushw");
137 rw = (struct reg_window __user *)
138 (regs->u_regs[14] + STACK_BIAS);
139 rwk = (struct reg_window *)
140 (regs->u_regs[14] + STACK_BIAS);
141 if (!(regs->tstate & TSTATE_PRIV)) {
142 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
143 return;
144 }
145 rwk = &r_w;
146 }
147 } else {
148 show_regwindow32(regs);
149 return;
150 }
151 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
152 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
153 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
154 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
155 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
156 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
157 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
158 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
159 if (regs->tstate & TSTATE_PRIV)
160 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
161}
162
163void show_regs(struct pt_regs *regs)
164{
165 show_regs_print_info(KERN_DEFAULT);
166
167 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
168 regs->tpc, regs->tnpc, regs->y, print_tainted());
169 printk("TPC: <%pS>\n", (void *) regs->tpc);
170 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
171 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
172 regs->u_regs[3]);
173 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
174 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
175 regs->u_regs[7]);
176 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
177 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
178 regs->u_regs[11]);
179 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
180 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
181 regs->u_regs[15]);
182 printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
183 show_regwindow(regs);
184 show_stack(current, (unsigned long *)regs->u_regs[UREG_FP], KERN_DEFAULT);
185}
186
187union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
188static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
189
190static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
191 int this_cpu)
192{
193 struct global_reg_snapshot *rp;
194
195 flushw_all();
196
197 rp = &global_cpu_snapshot[this_cpu].reg;
198
199 rp->tstate = regs->tstate;
200 rp->tpc = regs->tpc;
201 rp->tnpc = regs->tnpc;
202 rp->o7 = regs->u_regs[UREG_I7];
203
204 if (regs->tstate & TSTATE_PRIV) {
205 struct reg_window *rw;
206
207 rw = (struct reg_window *)
208 (regs->u_regs[UREG_FP] + STACK_BIAS);
209 if (kstack_valid(tp, (unsigned long) rw)) {
210 rp->i7 = rw->ins[7];
211 rw = (struct reg_window *)
212 (rw->ins[6] + STACK_BIAS);
213 if (kstack_valid(tp, (unsigned long) rw))
214 rp->rpc = rw->ins[7];
215 }
216 } else {
217 rp->i7 = 0;
218 rp->rpc = 0;
219 }
220 rp->thread = tp;
221}
222
223/* In order to avoid hangs we do not try to synchronize with the
224 * global register dump client cpus. The last store they make is to
225 * the thread pointer, so do a short poll waiting for that to become
226 * non-NULL.
227 */
228static void __global_reg_poll(struct global_reg_snapshot *gp)
229{
230 int limit = 0;
231
232 while (!gp->thread && ++limit < 100) {
233 barrier();
234 udelay(1);
235 }
236}
237
238void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
239{
240 struct thread_info *tp = current_thread_info();
241 struct pt_regs *regs = get_irq_regs();
242 unsigned long flags;
243 int this_cpu, cpu;
244
245 if (!regs)
246 regs = tp->kregs;
247
248 spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
249
250 this_cpu = raw_smp_processor_id();
251
252 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
253
254 if (cpumask_test_cpu(this_cpu, mask) && !exclude_self)
255 __global_reg_self(tp, regs, this_cpu);
256
257 smp_fetch_global_regs();
258
259 for_each_cpu(cpu, mask) {
260 struct global_reg_snapshot *gp;
261
262 if (exclude_self && cpu == this_cpu)
263 continue;
264
265 gp = &global_cpu_snapshot[cpu].reg;
266
267 __global_reg_poll(gp);
268
269 tp = gp->thread;
270 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
271 (cpu == this_cpu ? '*' : ' '), cpu,
272 gp->tstate, gp->tpc, gp->tnpc,
273 ((tp && tp->task) ? tp->task->comm : "NULL"),
274 ((tp && tp->task) ? tp->task->pid : -1));
275
276 if (gp->tstate & TSTATE_PRIV) {
277 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
278 (void *) gp->tpc,
279 (void *) gp->o7,
280 (void *) gp->i7,
281 (void *) gp->rpc);
282 } else {
283 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
284 gp->tpc, gp->o7, gp->i7, gp->rpc);
285 }
286
287 touch_nmi_watchdog();
288 }
289
290 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
291
292 spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
293}
294
295#ifdef CONFIG_MAGIC_SYSRQ
296
297static void sysrq_handle_globreg(int key)
298{
299 trigger_all_cpu_backtrace();
300}
301
302static const struct sysrq_key_op sparc_globalreg_op = {
303 .handler = sysrq_handle_globreg,
304 .help_msg = "global-regs(y)",
305 .action_msg = "Show Global CPU Regs",
306};
307
308static void __global_pmu_self(int this_cpu)
309{
310 struct global_pmu_snapshot *pp;
311 int i, num;
312
313 if (!pcr_ops)
314 return;
315
316 pp = &global_cpu_snapshot[this_cpu].pmu;
317
318 num = 1;
319 if (tlb_type == hypervisor &&
320 sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
321 num = 4;
322
323 for (i = 0; i < num; i++) {
324 pp->pcr[i] = pcr_ops->read_pcr(i);
325 pp->pic[i] = pcr_ops->read_pic(i);
326 }
327}
328
329static void __global_pmu_poll(struct global_pmu_snapshot *pp)
330{
331 int limit = 0;
332
333 while (!pp->pcr[0] && ++limit < 100) {
334 barrier();
335 udelay(1);
336 }
337}
338
339static void pmu_snapshot_all_cpus(void)
340{
341 unsigned long flags;
342 int this_cpu, cpu;
343
344 spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
345
346 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
347
348 this_cpu = raw_smp_processor_id();
349
350 __global_pmu_self(this_cpu);
351
352 smp_fetch_global_pmu();
353
354 for_each_online_cpu(cpu) {
355 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
356
357 __global_pmu_poll(pp);
358
359 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
360 (cpu == this_cpu ? '*' : ' '), cpu,
361 pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
362 pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
363
364 touch_nmi_watchdog();
365 }
366
367 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
368
369 spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
370}
371
372static void sysrq_handle_globpmu(int key)
373{
374 pmu_snapshot_all_cpus();
375}
376
377static const struct sysrq_key_op sparc_globalpmu_op = {
378 .handler = sysrq_handle_globpmu,
379 .help_msg = "global-pmu(x)",
380 .action_msg = "Show Global PMU Regs",
381};
382
383static int __init sparc_sysrq_init(void)
384{
385 int ret = register_sysrq_key('y', &sparc_globalreg_op);
386
387 if (!ret)
388 ret = register_sysrq_key('x', &sparc_globalpmu_op);
389 return ret;
390}
391
392core_initcall(sparc_sysrq_init);
393
394#endif
395
396/* Free current thread data structures etc.. */
397void exit_thread(struct task_struct *tsk)
398{
399 struct thread_info *t = task_thread_info(tsk);
400
401 if (t->utraps) {
402 if (t->utraps[0] < 2)
403 kfree (t->utraps);
404 else
405 t->utraps[0]--;
406 }
407}
408
409void flush_thread(void)
410{
411 struct thread_info *t = current_thread_info();
412 struct mm_struct *mm;
413
414 mm = t->task->mm;
415 if (mm)
416 tsb_context_switch(mm);
417
418 set_thread_wsaved(0);
419
420 /* Clear FPU register state. */
421 t->fpsaved[0] = 0;
422}
423
424/* It's a bit more tricky when 64-bit tasks are involved... */
425static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
426{
427 bool stack_64bit = test_thread_64bit_stack(psp);
428 unsigned long fp, distance, rval;
429
430 if (stack_64bit) {
431 csp += STACK_BIAS;
432 psp += STACK_BIAS;
433 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
434 fp += STACK_BIAS;
435 if (test_thread_flag(TIF_32BIT))
436 fp &= 0xffffffff;
437 } else
438 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
439
440 /* Now align the stack as this is mandatory in the Sparc ABI
441 * due to how register windows work. This hides the
442 * restriction from thread libraries etc.
443 */
444 csp &= ~15UL;
445
446 distance = fp - psp;
447 rval = (csp - distance);
448 if (raw_copy_in_user((void __user *)rval, (void __user *)psp, distance))
449 rval = 0;
450 else if (!stack_64bit) {
451 if (put_user(((u32)csp),
452 &(((struct reg_window32 __user *)rval)->ins[6])))
453 rval = 0;
454 } else {
455 if (put_user(((u64)csp - STACK_BIAS),
456 &(((struct reg_window __user *)rval)->ins[6])))
457 rval = 0;
458 else
459 rval = rval - STACK_BIAS;
460 }
461
462 return rval;
463}
464
465/* Standard stuff. */
466static inline void shift_window_buffer(int first_win, int last_win,
467 struct thread_info *t)
468{
469 int i;
470
471 for (i = first_win; i < last_win; i++) {
472 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
473 memcpy(&t->reg_window[i], &t->reg_window[i+1],
474 sizeof(struct reg_window));
475 }
476}
477
478void synchronize_user_stack(void)
479{
480 struct thread_info *t = current_thread_info();
481 unsigned long window;
482
483 flush_user_windows();
484 if ((window = get_thread_wsaved()) != 0) {
485 window -= 1;
486 do {
487 struct reg_window *rwin = &t->reg_window[window];
488 int winsize = sizeof(struct reg_window);
489 unsigned long sp;
490
491 sp = t->rwbuf_stkptrs[window];
492
493 if (test_thread_64bit_stack(sp))
494 sp += STACK_BIAS;
495 else
496 winsize = sizeof(struct reg_window32);
497
498 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
499 shift_window_buffer(window, get_thread_wsaved() - 1, t);
500 set_thread_wsaved(get_thread_wsaved() - 1);
501 }
502 } while (window--);
503 }
504}
505
506static void stack_unaligned(unsigned long sp)
507{
508 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) sp);
509}
510
511static const char uwfault32[] = KERN_INFO \
512 "%s[%d]: bad register window fault: SP %08lx (orig_sp %08lx) TPC %08lx O7 %08lx\n";
513static const char uwfault64[] = KERN_INFO \
514 "%s[%d]: bad register window fault: SP %016lx (orig_sp %016lx) TPC %08lx O7 %016lx\n";
515
516void fault_in_user_windows(struct pt_regs *regs)
517{
518 struct thread_info *t = current_thread_info();
519 unsigned long window;
520
521 flush_user_windows();
522 window = get_thread_wsaved();
523
524 if (likely(window != 0)) {
525 window -= 1;
526 do {
527 struct reg_window *rwin = &t->reg_window[window];
528 int winsize = sizeof(struct reg_window);
529 unsigned long sp, orig_sp;
530
531 orig_sp = sp = t->rwbuf_stkptrs[window];
532
533 if (test_thread_64bit_stack(sp))
534 sp += STACK_BIAS;
535 else
536 winsize = sizeof(struct reg_window32);
537
538 if (unlikely(sp & 0x7UL))
539 stack_unaligned(sp);
540
541 if (unlikely(copy_to_user((char __user *)sp,
542 rwin, winsize))) {
543 if (show_unhandled_signals)
544 printk_ratelimited(is_compat_task() ?
545 uwfault32 : uwfault64,
546 current->comm, current->pid,
547 sp, orig_sp,
548 regs->tpc,
549 regs->u_regs[UREG_I7]);
550 goto barf;
551 }
552 } while (window--);
553 }
554 set_thread_wsaved(0);
555 return;
556
557barf:
558 set_thread_wsaved(window + 1);
559 force_sig(SIGSEGV);
560}
561
562/* Copy a Sparc thread. The fork() return value conventions
563 * under SunOS are nothing short of bletcherous:
564 * Parent --> %o0 == childs pid, %o1 == 0
565 * Child --> %o0 == parents pid, %o1 == 1
566 */
567int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
568{
569 unsigned long clone_flags = args->flags;
570 unsigned long sp = args->stack;
571 unsigned long tls = args->tls;
572 struct thread_info *t = task_thread_info(p);
573 struct pt_regs *regs = current_pt_regs();
574 struct sparc_stackf *parent_sf;
575 unsigned long child_stack_sz;
576 char *child_trap_frame;
577
578 /* Calculate offset to stack_frame & pt_regs */
579 child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
580 child_trap_frame = (task_stack_page(p) +
581 (THREAD_SIZE - child_stack_sz));
582
583 t->new_child = 1;
584 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
585 t->kregs = (struct pt_regs *) (child_trap_frame +
586 sizeof(struct sparc_stackf));
587 t->fpsaved[0] = 0;
588
589 if (unlikely(args->fn)) {
590 memset(child_trap_frame, 0, child_stack_sz);
591 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
592 (current_pt_regs()->tstate + 1) & TSTATE_CWP;
593 t->kregs->u_regs[UREG_G1] = (unsigned long) args->fn;
594 t->kregs->u_regs[UREG_G2] = (unsigned long) args->fn_arg;
595 return 0;
596 }
597
598 parent_sf = ((struct sparc_stackf *) regs) - 1;
599 memcpy(child_trap_frame, parent_sf, child_stack_sz);
600 if (t->flags & _TIF_32BIT) {
601 sp &= 0x00000000ffffffffUL;
602 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
603 }
604 t->kregs->u_regs[UREG_FP] = sp;
605 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
606 (regs->tstate + 1) & TSTATE_CWP;
607 if (sp != regs->u_regs[UREG_FP]) {
608 unsigned long csp;
609
610 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
611 if (!csp)
612 return -EFAULT;
613 t->kregs->u_regs[UREG_FP] = csp;
614 }
615 if (t->utraps)
616 t->utraps[0]++;
617
618 /* Set the return value for the child. */
619 t->kregs->u_regs[UREG_I0] = current->pid;
620 t->kregs->u_regs[UREG_I1] = 1;
621
622 /* Set the second return value for the parent. */
623 regs->u_regs[UREG_I1] = 0;
624
625 if (clone_flags & CLONE_SETTLS)
626 t->kregs->u_regs[UREG_G7] = tls;
627
628 return 0;
629}
630
631/* TIF_MCDPER in thread info flags for current task is updated lazily upon
632 * a context switch. Update this flag in current task's thread flags
633 * before dup so the dup'd task will inherit the current TIF_MCDPER flag.
634 */
635int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
636{
637 if (adi_capable()) {
638 register unsigned long tmp_mcdper;
639
640 __asm__ __volatile__(
641 ".word 0x83438000\n\t" /* rd %mcdper, %g1 */
642 "mov %%g1, %0\n\t"
643 : "=r" (tmp_mcdper)
644 :
645 : "g1");
646 if (tmp_mcdper)
647 set_thread_flag(TIF_MCDPER);
648 else
649 clear_thread_flag(TIF_MCDPER);
650 }
651
652 *dst = *src;
653 return 0;
654}
655
656unsigned long __get_wchan(struct task_struct *task)
657{
658 unsigned long pc, fp, bias = 0;
659 struct thread_info *tp;
660 struct reg_window *rw;
661 unsigned long ret = 0;
662 int count = 0;
663
664 tp = task_thread_info(task);
665 bias = STACK_BIAS;
666 fp = task_thread_info(task)->ksp + bias;
667
668 do {
669 if (!kstack_valid(tp, fp))
670 break;
671 rw = (struct reg_window *) fp;
672 pc = rw->ins[7];
673 if (!in_sched_functions(pc)) {
674 ret = pc;
675 goto out;
676 }
677 fp = rw->ins[6] + bias;
678 } while (++count < 16);
679
680out:
681 return ret;
682}
1// SPDX-License-Identifier: GPL-2.0
2/* arch/sparc64/kernel/process.c
3 *
4 * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8
9/*
10 * This file handles the architecture-dependent parts of process handling..
11 */
12
13#include <stdarg.h>
14
15#include <linux/errno.h>
16#include <linux/export.h>
17#include <linux/sched.h>
18#include <linux/sched/debug.h>
19#include <linux/sched/task.h>
20#include <linux/sched/task_stack.h>
21#include <linux/kernel.h>
22#include <linux/mm.h>
23#include <linux/fs.h>
24#include <linux/smp.h>
25#include <linux/stddef.h>
26#include <linux/ptrace.h>
27#include <linux/slab.h>
28#include <linux/user.h>
29#include <linux/delay.h>
30#include <linux/compat.h>
31#include <linux/tick.h>
32#include <linux/init.h>
33#include <linux/cpu.h>
34#include <linux/perf_event.h>
35#include <linux/elfcore.h>
36#include <linux/sysrq.h>
37#include <linux/nmi.h>
38#include <linux/context_tracking.h>
39#include <linux/signal.h>
40
41#include <linux/uaccess.h>
42#include <asm/page.h>
43#include <asm/pgalloc.h>
44#include <asm/pgtable.h>
45#include <asm/processor.h>
46#include <asm/pstate.h>
47#include <asm/elf.h>
48#include <asm/fpumacro.h>
49#include <asm/head.h>
50#include <asm/cpudata.h>
51#include <asm/mmu_context.h>
52#include <asm/unistd.h>
53#include <asm/hypervisor.h>
54#include <asm/syscalls.h>
55#include <asm/irq_regs.h>
56#include <asm/smp.h>
57#include <asm/pcr.h>
58
59#include "kstack.h"
60
61/* Idle loop support on sparc64. */
62void arch_cpu_idle(void)
63{
64 if (tlb_type != hypervisor) {
65 touch_nmi_watchdog();
66 local_irq_enable();
67 } else {
68 unsigned long pstate;
69
70 local_irq_enable();
71
72 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
73 * the cpu sleep hypervisor call.
74 */
75 __asm__ __volatile__(
76 "rdpr %%pstate, %0\n\t"
77 "andn %0, %1, %0\n\t"
78 "wrpr %0, %%g0, %%pstate"
79 : "=&r" (pstate)
80 : "i" (PSTATE_IE));
81
82 if (!need_resched() && !cpu_is_offline(smp_processor_id())) {
83 sun4v_cpu_yield();
84 /* If resumed by cpu_poke then we need to explicitly
85 * call scheduler_ipi().
86 */
87 scheduler_poke();
88 }
89
90 /* Re-enable interrupts. */
91 __asm__ __volatile__(
92 "rdpr %%pstate, %0\n\t"
93 "or %0, %1, %0\n\t"
94 "wrpr %0, %%g0, %%pstate"
95 : "=&r" (pstate)
96 : "i" (PSTATE_IE));
97 }
98}
99
100#ifdef CONFIG_HOTPLUG_CPU
101void arch_cpu_idle_dead(void)
102{
103 sched_preempt_enable_no_resched();
104 cpu_play_dead();
105}
106#endif
107
108#ifdef CONFIG_COMPAT
109static void show_regwindow32(struct pt_regs *regs)
110{
111 struct reg_window32 __user *rw;
112 struct reg_window32 r_w;
113 mm_segment_t old_fs;
114
115 __asm__ __volatile__ ("flushw");
116 rw = compat_ptr((unsigned int)regs->u_regs[14]);
117 old_fs = get_fs();
118 set_fs (USER_DS);
119 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
120 set_fs (old_fs);
121 return;
122 }
123
124 set_fs (old_fs);
125 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
126 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
127 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
128 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
129 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
130 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
131 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
132 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
133}
134#else
135#define show_regwindow32(regs) do { } while (0)
136#endif
137
138static void show_regwindow(struct pt_regs *regs)
139{
140 struct reg_window __user *rw;
141 struct reg_window *rwk;
142 struct reg_window r_w;
143 mm_segment_t old_fs;
144
145 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
146 __asm__ __volatile__ ("flushw");
147 rw = (struct reg_window __user *)
148 (regs->u_regs[14] + STACK_BIAS);
149 rwk = (struct reg_window *)
150 (regs->u_regs[14] + STACK_BIAS);
151 if (!(regs->tstate & TSTATE_PRIV)) {
152 old_fs = get_fs();
153 set_fs (USER_DS);
154 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
155 set_fs (old_fs);
156 return;
157 }
158 rwk = &r_w;
159 set_fs (old_fs);
160 }
161 } else {
162 show_regwindow32(regs);
163 return;
164 }
165 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
166 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
167 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
168 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
169 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
170 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
171 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
172 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
173 if (regs->tstate & TSTATE_PRIV)
174 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
175}
176
177void show_regs(struct pt_regs *regs)
178{
179 show_regs_print_info(KERN_DEFAULT);
180
181 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
182 regs->tpc, regs->tnpc, regs->y, print_tainted());
183 printk("TPC: <%pS>\n", (void *) regs->tpc);
184 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
185 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
186 regs->u_regs[3]);
187 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
188 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
189 regs->u_regs[7]);
190 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
191 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
192 regs->u_regs[11]);
193 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
194 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
195 regs->u_regs[15]);
196 printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
197 show_regwindow(regs);
198 show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
199}
200
201union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
202static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
203
204static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
205 int this_cpu)
206{
207 struct global_reg_snapshot *rp;
208
209 flushw_all();
210
211 rp = &global_cpu_snapshot[this_cpu].reg;
212
213 rp->tstate = regs->tstate;
214 rp->tpc = regs->tpc;
215 rp->tnpc = regs->tnpc;
216 rp->o7 = regs->u_regs[UREG_I7];
217
218 if (regs->tstate & TSTATE_PRIV) {
219 struct reg_window *rw;
220
221 rw = (struct reg_window *)
222 (regs->u_regs[UREG_FP] + STACK_BIAS);
223 if (kstack_valid(tp, (unsigned long) rw)) {
224 rp->i7 = rw->ins[7];
225 rw = (struct reg_window *)
226 (rw->ins[6] + STACK_BIAS);
227 if (kstack_valid(tp, (unsigned long) rw))
228 rp->rpc = rw->ins[7];
229 }
230 } else {
231 rp->i7 = 0;
232 rp->rpc = 0;
233 }
234 rp->thread = tp;
235}
236
237/* In order to avoid hangs we do not try to synchronize with the
238 * global register dump client cpus. The last store they make is to
239 * the thread pointer, so do a short poll waiting for that to become
240 * non-NULL.
241 */
242static void __global_reg_poll(struct global_reg_snapshot *gp)
243{
244 int limit = 0;
245
246 while (!gp->thread && ++limit < 100) {
247 barrier();
248 udelay(1);
249 }
250}
251
252void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
253{
254 struct thread_info *tp = current_thread_info();
255 struct pt_regs *regs = get_irq_regs();
256 unsigned long flags;
257 int this_cpu, cpu;
258
259 if (!regs)
260 regs = tp->kregs;
261
262 spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
263
264 this_cpu = raw_smp_processor_id();
265
266 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
267
268 if (cpumask_test_cpu(this_cpu, mask) && !exclude_self)
269 __global_reg_self(tp, regs, this_cpu);
270
271 smp_fetch_global_regs();
272
273 for_each_cpu(cpu, mask) {
274 struct global_reg_snapshot *gp;
275
276 if (exclude_self && cpu == this_cpu)
277 continue;
278
279 gp = &global_cpu_snapshot[cpu].reg;
280
281 __global_reg_poll(gp);
282
283 tp = gp->thread;
284 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
285 (cpu == this_cpu ? '*' : ' '), cpu,
286 gp->tstate, gp->tpc, gp->tnpc,
287 ((tp && tp->task) ? tp->task->comm : "NULL"),
288 ((tp && tp->task) ? tp->task->pid : -1));
289
290 if (gp->tstate & TSTATE_PRIV) {
291 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
292 (void *) gp->tpc,
293 (void *) gp->o7,
294 (void *) gp->i7,
295 (void *) gp->rpc);
296 } else {
297 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
298 gp->tpc, gp->o7, gp->i7, gp->rpc);
299 }
300
301 touch_nmi_watchdog();
302 }
303
304 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
305
306 spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
307}
308
309#ifdef CONFIG_MAGIC_SYSRQ
310
311static void sysrq_handle_globreg(int key)
312{
313 trigger_all_cpu_backtrace();
314}
315
316static struct sysrq_key_op sparc_globalreg_op = {
317 .handler = sysrq_handle_globreg,
318 .help_msg = "global-regs(y)",
319 .action_msg = "Show Global CPU Regs",
320};
321
322static void __global_pmu_self(int this_cpu)
323{
324 struct global_pmu_snapshot *pp;
325 int i, num;
326
327 if (!pcr_ops)
328 return;
329
330 pp = &global_cpu_snapshot[this_cpu].pmu;
331
332 num = 1;
333 if (tlb_type == hypervisor &&
334 sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
335 num = 4;
336
337 for (i = 0; i < num; i++) {
338 pp->pcr[i] = pcr_ops->read_pcr(i);
339 pp->pic[i] = pcr_ops->read_pic(i);
340 }
341}
342
343static void __global_pmu_poll(struct global_pmu_snapshot *pp)
344{
345 int limit = 0;
346
347 while (!pp->pcr[0] && ++limit < 100) {
348 barrier();
349 udelay(1);
350 }
351}
352
353static void pmu_snapshot_all_cpus(void)
354{
355 unsigned long flags;
356 int this_cpu, cpu;
357
358 spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
359
360 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
361
362 this_cpu = raw_smp_processor_id();
363
364 __global_pmu_self(this_cpu);
365
366 smp_fetch_global_pmu();
367
368 for_each_online_cpu(cpu) {
369 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
370
371 __global_pmu_poll(pp);
372
373 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
374 (cpu == this_cpu ? '*' : ' '), cpu,
375 pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
376 pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
377
378 touch_nmi_watchdog();
379 }
380
381 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
382
383 spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
384}
385
386static void sysrq_handle_globpmu(int key)
387{
388 pmu_snapshot_all_cpus();
389}
390
391static struct sysrq_key_op sparc_globalpmu_op = {
392 .handler = sysrq_handle_globpmu,
393 .help_msg = "global-pmu(x)",
394 .action_msg = "Show Global PMU Regs",
395};
396
397static int __init sparc_sysrq_init(void)
398{
399 int ret = register_sysrq_key('y', &sparc_globalreg_op);
400
401 if (!ret)
402 ret = register_sysrq_key('x', &sparc_globalpmu_op);
403 return ret;
404}
405
406core_initcall(sparc_sysrq_init);
407
408#endif
409
410/* Free current thread data structures etc.. */
411void exit_thread(struct task_struct *tsk)
412{
413 struct thread_info *t = task_thread_info(tsk);
414
415 if (t->utraps) {
416 if (t->utraps[0] < 2)
417 kfree (t->utraps);
418 else
419 t->utraps[0]--;
420 }
421}
422
423void flush_thread(void)
424{
425 struct thread_info *t = current_thread_info();
426 struct mm_struct *mm;
427
428 mm = t->task->mm;
429 if (mm)
430 tsb_context_switch(mm);
431
432 set_thread_wsaved(0);
433
434 /* Clear FPU register state. */
435 t->fpsaved[0] = 0;
436}
437
438/* It's a bit more tricky when 64-bit tasks are involved... */
439static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
440{
441 bool stack_64bit = test_thread_64bit_stack(psp);
442 unsigned long fp, distance, rval;
443
444 if (stack_64bit) {
445 csp += STACK_BIAS;
446 psp += STACK_BIAS;
447 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
448 fp += STACK_BIAS;
449 if (test_thread_flag(TIF_32BIT))
450 fp &= 0xffffffff;
451 } else
452 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
453
454 /* Now align the stack as this is mandatory in the Sparc ABI
455 * due to how register windows work. This hides the
456 * restriction from thread libraries etc.
457 */
458 csp &= ~15UL;
459
460 distance = fp - psp;
461 rval = (csp - distance);
462 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
463 rval = 0;
464 else if (!stack_64bit) {
465 if (put_user(((u32)csp),
466 &(((struct reg_window32 __user *)rval)->ins[6])))
467 rval = 0;
468 } else {
469 if (put_user(((u64)csp - STACK_BIAS),
470 &(((struct reg_window __user *)rval)->ins[6])))
471 rval = 0;
472 else
473 rval = rval - STACK_BIAS;
474 }
475
476 return rval;
477}
478
479/* Standard stuff. */
480static inline void shift_window_buffer(int first_win, int last_win,
481 struct thread_info *t)
482{
483 int i;
484
485 for (i = first_win; i < last_win; i++) {
486 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
487 memcpy(&t->reg_window[i], &t->reg_window[i+1],
488 sizeof(struct reg_window));
489 }
490}
491
492void synchronize_user_stack(void)
493{
494 struct thread_info *t = current_thread_info();
495 unsigned long window;
496
497 flush_user_windows();
498 if ((window = get_thread_wsaved()) != 0) {
499 window -= 1;
500 do {
501 struct reg_window *rwin = &t->reg_window[window];
502 int winsize = sizeof(struct reg_window);
503 unsigned long sp;
504
505 sp = t->rwbuf_stkptrs[window];
506
507 if (test_thread_64bit_stack(sp))
508 sp += STACK_BIAS;
509 else
510 winsize = sizeof(struct reg_window32);
511
512 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
513 shift_window_buffer(window, get_thread_wsaved() - 1, t);
514 set_thread_wsaved(get_thread_wsaved() - 1);
515 }
516 } while (window--);
517 }
518}
519
520static void stack_unaligned(unsigned long sp)
521{
522 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) sp, 0);
523}
524
525static const char uwfault32[] = KERN_INFO \
526 "%s[%d]: bad register window fault: SP %08lx (orig_sp %08lx) TPC %08lx O7 %08lx\n";
527static const char uwfault64[] = KERN_INFO \
528 "%s[%d]: bad register window fault: SP %016lx (orig_sp %016lx) TPC %08lx O7 %016lx\n";
529
530void fault_in_user_windows(struct pt_regs *regs)
531{
532 struct thread_info *t = current_thread_info();
533 unsigned long window;
534
535 flush_user_windows();
536 window = get_thread_wsaved();
537
538 if (likely(window != 0)) {
539 window -= 1;
540 do {
541 struct reg_window *rwin = &t->reg_window[window];
542 int winsize = sizeof(struct reg_window);
543 unsigned long sp, orig_sp;
544
545 orig_sp = sp = t->rwbuf_stkptrs[window];
546
547 if (test_thread_64bit_stack(sp))
548 sp += STACK_BIAS;
549 else
550 winsize = sizeof(struct reg_window32);
551
552 if (unlikely(sp & 0x7UL))
553 stack_unaligned(sp);
554
555 if (unlikely(copy_to_user((char __user *)sp,
556 rwin, winsize))) {
557 if (show_unhandled_signals)
558 printk_ratelimited(is_compat_task() ?
559 uwfault32 : uwfault64,
560 current->comm, current->pid,
561 sp, orig_sp,
562 regs->tpc,
563 regs->u_regs[UREG_I7]);
564 goto barf;
565 }
566 } while (window--);
567 }
568 set_thread_wsaved(0);
569 return;
570
571barf:
572 set_thread_wsaved(window + 1);
573 force_sig(SIGSEGV);
574}
575
576asmlinkage long sparc_do_fork(unsigned long clone_flags,
577 unsigned long stack_start,
578 struct pt_regs *regs,
579 unsigned long stack_size)
580{
581 int __user *parent_tid_ptr, *child_tid_ptr;
582 unsigned long orig_i1 = regs->u_regs[UREG_I1];
583 long ret;
584
585#ifdef CONFIG_COMPAT
586 if (test_thread_flag(TIF_32BIT)) {
587 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
588 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
589 } else
590#endif
591 {
592 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
593 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
594 }
595
596 ret = do_fork(clone_flags, stack_start, stack_size,
597 parent_tid_ptr, child_tid_ptr);
598
599 /* If we get an error and potentially restart the system
600 * call, we're screwed because copy_thread() clobbered
601 * the parent's %o1. So detect that case and restore it
602 * here.
603 */
604 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
605 regs->u_regs[UREG_I1] = orig_i1;
606
607 return ret;
608}
609
610/* Copy a Sparc thread. The fork() return value conventions
611 * under SunOS are nothing short of bletcherous:
612 * Parent --> %o0 == childs pid, %o1 == 0
613 * Child --> %o0 == parents pid, %o1 == 1
614 */
615int copy_thread(unsigned long clone_flags, unsigned long sp,
616 unsigned long arg, struct task_struct *p)
617{
618 struct thread_info *t = task_thread_info(p);
619 struct pt_regs *regs = current_pt_regs();
620 struct sparc_stackf *parent_sf;
621 unsigned long child_stack_sz;
622 char *child_trap_frame;
623
624 /* Calculate offset to stack_frame & pt_regs */
625 child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
626 child_trap_frame = (task_stack_page(p) +
627 (THREAD_SIZE - child_stack_sz));
628
629 t->new_child = 1;
630 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
631 t->kregs = (struct pt_regs *) (child_trap_frame +
632 sizeof(struct sparc_stackf));
633 t->fpsaved[0] = 0;
634
635 if (unlikely(p->flags & PF_KTHREAD)) {
636 memset(child_trap_frame, 0, child_stack_sz);
637 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
638 (current_pt_regs()->tstate + 1) & TSTATE_CWP;
639 t->current_ds = ASI_P;
640 t->kregs->u_regs[UREG_G1] = sp; /* function */
641 t->kregs->u_regs[UREG_G2] = arg;
642 return 0;
643 }
644
645 parent_sf = ((struct sparc_stackf *) regs) - 1;
646 memcpy(child_trap_frame, parent_sf, child_stack_sz);
647 if (t->flags & _TIF_32BIT) {
648 sp &= 0x00000000ffffffffUL;
649 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
650 }
651 t->kregs->u_regs[UREG_FP] = sp;
652 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
653 (regs->tstate + 1) & TSTATE_CWP;
654 t->current_ds = ASI_AIUS;
655 if (sp != regs->u_regs[UREG_FP]) {
656 unsigned long csp;
657
658 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
659 if (!csp)
660 return -EFAULT;
661 t->kregs->u_regs[UREG_FP] = csp;
662 }
663 if (t->utraps)
664 t->utraps[0]++;
665
666 /* Set the return value for the child. */
667 t->kregs->u_regs[UREG_I0] = current->pid;
668 t->kregs->u_regs[UREG_I1] = 1;
669
670 /* Set the second return value for the parent. */
671 regs->u_regs[UREG_I1] = 0;
672
673 if (clone_flags & CLONE_SETTLS)
674 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
675
676 return 0;
677}
678
679/* TIF_MCDPER in thread info flags for current task is updated lazily upon
680 * a context switch. Update this flag in current task's thread flags
681 * before dup so the dup'd task will inherit the current TIF_MCDPER flag.
682 */
683int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
684{
685 if (adi_capable()) {
686 register unsigned long tmp_mcdper;
687
688 __asm__ __volatile__(
689 ".word 0x83438000\n\t" /* rd %mcdper, %g1 */
690 "mov %%g1, %0\n\t"
691 : "=r" (tmp_mcdper)
692 :
693 : "g1");
694 if (tmp_mcdper)
695 set_thread_flag(TIF_MCDPER);
696 else
697 clear_thread_flag(TIF_MCDPER);
698 }
699
700 *dst = *src;
701 return 0;
702}
703
704typedef struct {
705 union {
706 unsigned int pr_regs[32];
707 unsigned long pr_dregs[16];
708 } pr_fr;
709 unsigned int __unused;
710 unsigned int pr_fsr;
711 unsigned char pr_qcnt;
712 unsigned char pr_q_entrysize;
713 unsigned char pr_en;
714 unsigned int pr_q[64];
715} elf_fpregset_t32;
716
717/*
718 * fill in the fpu structure for a core dump.
719 */
720int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
721{
722 unsigned long *kfpregs = current_thread_info()->fpregs;
723 unsigned long fprs = current_thread_info()->fpsaved[0];
724
725 if (test_thread_flag(TIF_32BIT)) {
726 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
727
728 if (fprs & FPRS_DL)
729 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
730 sizeof(unsigned int) * 32);
731 else
732 memset(&fpregs32->pr_fr.pr_regs[0], 0,
733 sizeof(unsigned int) * 32);
734 fpregs32->pr_qcnt = 0;
735 fpregs32->pr_q_entrysize = 8;
736 memset(&fpregs32->pr_q[0], 0,
737 (sizeof(unsigned int) * 64));
738 if (fprs & FPRS_FEF) {
739 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
740 fpregs32->pr_en = 1;
741 } else {
742 fpregs32->pr_fsr = 0;
743 fpregs32->pr_en = 0;
744 }
745 } else {
746 if(fprs & FPRS_DL)
747 memcpy(&fpregs->pr_regs[0], kfpregs,
748 sizeof(unsigned int) * 32);
749 else
750 memset(&fpregs->pr_regs[0], 0,
751 sizeof(unsigned int) * 32);
752 if(fprs & FPRS_DU)
753 memcpy(&fpregs->pr_regs[16], kfpregs+16,
754 sizeof(unsigned int) * 32);
755 else
756 memset(&fpregs->pr_regs[16], 0,
757 sizeof(unsigned int) * 32);
758 if(fprs & FPRS_FEF) {
759 fpregs->pr_fsr = current_thread_info()->xfsr[0];
760 fpregs->pr_gsr = current_thread_info()->gsr[0];
761 } else {
762 fpregs->pr_fsr = fpregs->pr_gsr = 0;
763 }
764 fpregs->pr_fprs = fprs;
765 }
766 return 1;
767}
768EXPORT_SYMBOL(dump_fpu);
769
770unsigned long get_wchan(struct task_struct *task)
771{
772 unsigned long pc, fp, bias = 0;
773 struct thread_info *tp;
774 struct reg_window *rw;
775 unsigned long ret = 0;
776 int count = 0;
777
778 if (!task || task == current ||
779 task->state == TASK_RUNNING)
780 goto out;
781
782 tp = task_thread_info(task);
783 bias = STACK_BIAS;
784 fp = task_thread_info(task)->ksp + bias;
785
786 do {
787 if (!kstack_valid(tp, fp))
788 break;
789 rw = (struct reg_window *) fp;
790 pc = rw->ins[7];
791 if (!in_sched_functions(pc)) {
792 ret = pc;
793 goto out;
794 }
795 fp = rw->ins[6] + bias;
796 } while (++count < 16);
797
798out:
799 return ret;
800}