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sparc64: Make global reg dumping even more useful.
[deliverable/linux.git] / arch / sparc64 / kernel / process.c
CommitLineData
5526b7e4 1/* arch/sparc64/kernel/process.c
1da177e4 2 *
93dae5b7 3 * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
1da177e4
LT		 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
1da177e4
LT		 14#include <linux/errno.h>
15#include <linux/module.h>
16#include <linux/sched.h>
17#include <linux/kernel.h>
1da177e4 18#include <linux/mm.h>
4e950f6f 19#include <linux/fs.h>
1da177e4 20#include <linux/smp.h>
1da177e4
LT		 21#include <linux/stddef.h>
22#include <linux/ptrace.h>
23#include <linux/slab.h>
24#include <linux/user.h>
1da177e4
LT		 25#include <linux/reboot.h>
26#include <linux/delay.h>
27#include <linux/compat.h>
038cb01e 28#include <linux/tick.h>
1da177e4 29#include <linux/init.h>
e0204409 30#include <linux/cpu.h>
b1422401 31#include <linux/elfcore.h>
93dae5b7 32#include <linux/sysrq.h>
1da177e4
LT		 33
34#include <asm/oplib.h>
35#include <asm/uaccess.h>
36#include <asm/system.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>
74bf4312 46#include <asm/mmu_context.h>
1da177e4 47#include <asm/unistd.h>
30c91d57 48#include <asm/hypervisor.h>
22d6a1cb 49#include <asm/sstate.h>
c3c25240 50#include <asm/reboot.h>
b1422401 51#include <asm/syscalls.h>
93dae5b7
DM		 52#include <asm/irq_regs.h>
53#include <asm/smp.h>
1da177e4
LT		 54
55/* #define VERBOSE_SHOWREGS */
56
e0204409 57static void sparc64_yield(int cpu)
1da177e4 58{
30c91d57
DM		 59 if (tlb_type != hypervisor)
60 return;
61
62 clear_thread_flag(TIF_POLLING_NRFLAG);
63 smp_mb__after_clear_bit();
64
e0204409 65 while (!need_resched() && !cpu_is_offline(cpu)) {
30c91d57
DM		 66 unsigned long pstate;
67
68 /* Disable interrupts. */
69 __asm__ __volatile__(
70 "rdpr %%pstate, %0\n\t"
71 "andn %0, %1, %0\n\t"
72 "wrpr %0, %%g0, %%pstate"
73 : "=&r" (pstate)
74 : "i" (PSTATE_IE));
75
e0204409 76 if (!need_resched() && !cpu_is_offline(cpu))
30c91d57
DM		 77 sun4v_cpu_yield();
78
79 /* Re-enable interrupts. */
80 __asm__ __volatile__(
81 "rdpr %%pstate, %0\n\t"
82 "or %0, %1, %0\n\t"
83 "wrpr %0, %%g0, %%pstate"
84 : "=&r" (pstate)
85 : "i" (PSTATE_IE));
1da177e4 86 }
1da177e4 87
30c91d57
DM		 88 set_thread_flag(TIF_POLLING_NRFLAG);
89}
1da177e4 90
30c91d57 91/* The idle loop on sparc64. */
1da177e4
LT		 92void cpu_idle(void)
93{
e0204409
DM		 94 int cpu = smp_processor_id();
95
1da177e4 96 set_thread_flag(TIF_POLLING_NRFLAG);
64c7c8f8 97
1da177e4 98 while(1) {
b8f8c3cf 99 tick_nohz_stop_sched_tick(1);
e0204409
DM		 100
101 while (!need_resched() && !cpu_is_offline(cpu))
102 sparc64_yield(cpu);
103
038cb01e
DM		 104 tick_nohz_restart_sched_tick();
105
106 preempt_enable_no_resched();
e0204409
DM		 107
108#ifdef CONFIG_HOTPLUG_CPU
109 if (cpu_is_offline(cpu))
110 cpu_play_dead();
111#endif
112
038cb01e
DM		 113 schedule();
114 preempt_disable();
1da177e4
LT		 115 }
116}
117
1da177e4
LT		 118void machine_halt(void)
119{
22d6a1cb 120 sstate_halt();
1da177e4
LT		 121 prom_halt();
122 panic("Halt failed!");
123}
124
1da177e4
LT		 125void machine_alt_power_off(void)
126{
22d6a1cb 127 sstate_poweroff();
1da177e4
LT		 128 prom_halt_power_off();
129 panic("Power-off failed!");
130}
131
132void machine_restart(char * cmd)
133{
134 char *p;
135
22d6a1cb 136 sstate_reboot();
1da177e4
LT		 137 p = strchr (reboot_command, '\n');
138 if (p) *p = 0;
1da177e4
LT		 139 if (cmd)
140 prom_reboot(cmd);
141 if (*reboot_command)
142 prom_reboot(reboot_command);
143 prom_reboot("");
144 panic("Reboot failed!");
145}
146
959a85ad 147#ifdef CONFIG_COMPAT
1da177e4
LT		 148static void show_regwindow32(struct pt_regs *regs)
149{
150 struct reg_window32 __user *rw;
151 struct reg_window32 r_w;
152 mm_segment_t old_fs;
153
154 __asm__ __volatile__ ("flushw");
155 rw = compat_ptr((unsigned)regs->u_regs[14]);
156 old_fs = get_fs();
157 set_fs (USER_DS);
158 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
159 set_fs (old_fs);
160 return;
161 }
162
163 set_fs (old_fs);
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]);
172}
959a85ad
DM		 173#else
174#define show_regwindow32(regs) do { } while (0)
175#endif
1da177e4
LT		 176
177static void show_regwindow(struct pt_regs *regs)
178{
179 struct reg_window __user *rw;
180 struct reg_window *rwk;
181 struct reg_window r_w;
182 mm_segment_t old_fs;
183
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)) {
191 old_fs = get_fs();
192 set_fs (USER_DS);
193 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
194 set_fs (old_fs);
195 return;
196 }
197 rwk = &r_w;
198 set_fs (old_fs);
199 }
200 } else {
201 show_regwindow32(regs);
202 return;
203 }
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)
4fe3ebec 213 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
1da177e4
LT		 214}
215
1da177e4
LT		 216#ifdef CONFIG_SMP
217static DEFINE_SPINLOCK(regdump_lock);
218#endif
219
220void __show_regs(struct pt_regs * regs)
221{
222#ifdef CONFIG_SMP
223 unsigned long flags;
224
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"
228 : "=r" (flags)
229 : "i" (PSTATE_IE));
230 spin_lock(&regdump_lock);
231#endif
232 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
233 regs->tpc, regs->tnpc, regs->y, print_tainted());
4fe3ebec 234 printk("TPC: <%pS>\n", (void *) regs->tpc);
1da177e4
LT		 235 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
236 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
237 regs->u_regs[3]);
238 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
239 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
240 regs->u_regs[7]);
241 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
242 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
243 regs->u_regs[11]);
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],
246 regs->u_regs[15]);
4fe3ebec 247 printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
1da177e4
LT		 248 show_regwindow(regs);
249#ifdef CONFIG_SMP
250 spin_unlock(&regdump_lock);
251 __asm__ __volatile__("wrpr %0, 0, %%pstate"
252 : : "r" (flags));
253#endif
254}
255
256#ifdef VERBOSE_SHOWREGS
257static void idump_from_user (unsigned int *pc)
258{
259 int i;
260 int code;
261
262 if((((unsigned long) pc) & 3))
263 return;
264
265 pc -= 3;
266 for(i = -3; i < 6; i++) {
267 get_user(code, pc);
268 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
269 pc++;
270 }
271 printk("\n");
272}
273#endif
274
275void show_regs(struct pt_regs *regs)
276{
277#ifdef VERBOSE_SHOWREGS
278 extern long etrap, etraptl1;
279#endif
280 __show_regs(regs);
19a0d585 281#if 0
1da177e4
LT		 282#ifdef CONFIG_SMP
283 {
284 extern void smp_report_regs(void);
285
286 smp_report_regs();
287 }
288#endif
19a0d585 289#endif
1da177e4
LT		 290
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");
299 }
300#endif
301}
302
93dae5b7
DM		 303#ifdef CONFIG_MAGIC_SYSRQ
304struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
305static DEFINE_SPINLOCK(global_reg_snapshot_lock);
306
5afe2738
DM		 307static bool kstack_valid(struct thread_info *tp, struct reg_window *rw)
308{
309 unsigned long thread_base, fp;
310
311 thread_base = (unsigned long) tp;
312 fp = (unsigned long) rw;
313
314 if (fp < (thread_base + sizeof(struct thread_info)) ||
315 fp >= (thread_base + THREAD_SIZE))
316 return false;
317 return true;
318}
319
93dae5b7
DM		 320static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
321 int this_cpu)
322{
323 flushw_all();
324
325 global_reg_snapshot[this_cpu].tstate = regs->tstate;
326 global_reg_snapshot[this_cpu].tpc = regs->tpc;
327 global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
328 global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
329
330 if (regs->tstate & TSTATE_PRIV) {
5afe2738 331 struct thread_info *tp = current_thread_info();
93dae5b7
DM		 332 struct reg_window *rw;
333
334 rw = (struct reg_window *)
335 (regs->u_regs[UREG_FP] + STACK_BIAS);
5afe2738
DM		 336 if (kstack_valid(tp, rw)) {
337 global_reg_snapshot[this_cpu].i7 = rw->ins[7];
338 rw = (struct reg_window *)
339 (rw->ins[6] + STACK_BIAS);
340 if (kstack_valid(tp, rw))
341 global_reg_snapshot[this_cpu].rpc = rw->ins[7];
342 }
343 } else {
93dae5b7 344 global_reg_snapshot[this_cpu].i7 = 0;
5afe2738
DM		 345 global_reg_snapshot[this_cpu].rpc = 0;
346 }
93dae5b7
DM		 347 global_reg_snapshot[this_cpu].thread = tp;
348}
349
350/* In order to avoid hangs we do not try to synchronize with the
351 * global register dump client cpus. The last store they make is to
352 * the thread pointer, so do a short poll waiting for that to become
353 * non-NULL.
354 */
355static void __global_reg_poll(struct global_reg_snapshot *gp)
356{
357 int limit = 0;
358
359 while (!gp->thread && ++limit < 100) {
360 barrier();
361 udelay(1);
362 }
363}
364
365static void sysrq_handle_globreg(int key, struct tty_struct *tty)
366{
367 struct thread_info *tp = current_thread_info();
368 struct pt_regs *regs = get_irq_regs();
93dae5b7
DM		 369 unsigned long flags;
370 int this_cpu, cpu;
371
372 if (!regs)
373 regs = tp->kregs;
374
375 spin_lock_irqsave(&global_reg_snapshot_lock, flags);
376
377 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
378
379 this_cpu = raw_smp_processor_id();
380
381 __global_reg_self(tp, regs, this_cpu);
382
383 smp_fetch_global_regs();
384
385 for_each_online_cpu(cpu) {
386 struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
387 struct thread_info *tp;
388
389 __global_reg_poll(gp);
390
391 tp = gp->thread;
392 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
393 (cpu == this_cpu ? '*' : ' '), cpu,
394 gp->tstate, gp->tpc, gp->tnpc,
395 ((tp && tp->task) ? tp->task->comm : "NULL"),
396 ((tp && tp->task) ? tp->task->pid : -1));
4fe3ebec 397
93dae5b7 398 if (gp->tstate & TSTATE_PRIV) {
5afe2738 399 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
4fe3ebec
DM		 400 (void *) gp->tpc,
401 (void *) gp->o7,
5afe2738
DM		 402 (void *) gp->i7,
403 (void *) gp->rpc);
4fe3ebec 404 } else {
5afe2738
DM		 405 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
406 gp->tpc, gp->o7, gp->i7, gp->rpc);
93dae5b7
DM		 407 }
408 }
409
410 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
411
412 spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
413}
414
415static struct sysrq_key_op sparc_globalreg_op = {
416 .handler = sysrq_handle_globreg,
417 .help_msg = "Globalregs",
418 .action_msg = "Show Global CPU Regs",
419};
420
421static int __init sparc_globreg_init(void)
422{
423 return register_sysrq_key('y', &sparc_globalreg_op);
424}
425
426core_initcall(sparc_globreg_init);
427
428#endif
429
1da177e4
LT		 430unsigned long thread_saved_pc(struct task_struct *tsk)
431{
f3169641 432 struct thread_info *ti = task_thread_info(tsk);
1da177e4
LT		 433 unsigned long ret = 0xdeadbeefUL;
434
435 if (ti && ti->ksp) {
436 unsigned long *sp;
437 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
438 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
439 sp[14]) {
440 unsigned long *fp;
441 fp = (unsigned long *)(sp[14] + STACK_BIAS);
442 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
443 ret = fp[15];
444 }
445 }
446 return ret;
447}
448
449/* Free current thread data structures etc.. */
450void exit_thread(void)
451{
452 struct thread_info *t = current_thread_info();
453
454 if (t->utraps) {
455 if (t->utraps[0] < 2)
456 kfree (t->utraps);
457 else
458 t->utraps[0]--;
459 }
460
461 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
462 t->user_cntd0 = t->user_cntd1 = NULL;
463 t->pcr_reg = 0;
464 write_pcr(0);
465 }
466}
467
468void flush_thread(void)
469{
470 struct thread_info *t = current_thread_info();
74bf4312 471 struct mm_struct *mm;
1da177e4 472
c0a79b22
MD		 473 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
474 clear_ti_thread_flag(t, TIF_ABI_PENDING);
475 if (test_ti_thread_flag(t, TIF_32BIT))
476 clear_ti_thread_flag(t, TIF_32BIT);
477 else
478 set_ti_thread_flag(t, TIF_32BIT);
479 }
1da177e4 480
74bf4312
DM		 481 mm = t->task->mm;
482 if (mm)
98c5584c 483 tsb_context_switch(mm);
1da177e4 484
1da177e4
LT		 485 set_thread_wsaved(0);
486
487 /* Turn off performance counters if on. */
488 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
489 t->user_cntd0 = t->user_cntd1 = NULL;
490 t->pcr_reg = 0;
491 write_pcr(0);
492 }
493
494 /* Clear FPU register state. */
495 t->fpsaved[0] = 0;
496
497 if (get_thread_current_ds() != ASI_AIUS)
498 set_fs(USER_DS);
1da177e4
LT		 499}
500
501/* It's a bit more tricky when 64-bit tasks are involved... */
502static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
503{
504 unsigned long fp, distance, rval;
505
506 if (!(test_thread_flag(TIF_32BIT))) {
507 csp += STACK_BIAS;
508 psp += STACK_BIAS;
509 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
510 fp += STACK_BIAS;
511 } else
512 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
513
514 /* Now 8-byte align the stack as this is mandatory in the
515 * Sparc ABI due to how register windows work. This hides
516 * the restriction from thread libraries etc. -DaveM
517 */
518 csp &= ~7UL;
519
520 distance = fp - psp;
521 rval = (csp - distance);
522 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
523 rval = 0;
524 else if (test_thread_flag(TIF_32BIT)) {
525 if (put_user(((u32)csp),
526 &(((struct reg_window32 __user *)rval)->ins[6])))
527 rval = 0;
528 } else {
529 if (put_user(((u64)csp - STACK_BIAS),
530 &(((struct reg_window __user *)rval)->ins[6])))
531 rval = 0;
532 else
533 rval = rval - STACK_BIAS;
534 }
535
536 return rval;
537}
538
539/* Standard stuff. */
540static inline void shift_window_buffer(int first_win, int last_win,
541 struct thread_info *t)
542{
543 int i;
544
545 for (i = first_win; i < last_win; i++) {
546 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
547 memcpy(&t->reg_window[i], &t->reg_window[i+1],
548 sizeof(struct reg_window));
549 }
550}
551
552void synchronize_user_stack(void)
553{
554 struct thread_info *t = current_thread_info();
555 unsigned long window;
556
557 flush_user_windows();
558 if ((window = get_thread_wsaved()) != 0) {
559 int winsize = sizeof(struct reg_window);
560 int bias = 0;
561
562 if (test_thread_flag(TIF_32BIT))
563 winsize = sizeof(struct reg_window32);
564 else
565 bias = STACK_BIAS;
566
567 window -= 1;
568 do {
569 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
570 struct reg_window *rwin = &t->reg_window[window];
571
572 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
573 shift_window_buffer(window, get_thread_wsaved() - 1, t);
574 set_thread_wsaved(get_thread_wsaved() - 1);
575 }
576 } while (window--);
577 }
578}
579
314ef685
DM		 580static void stack_unaligned(unsigned long sp)
581{
582 siginfo_t info;
583
584 info.si_signo = SIGBUS;
585 info.si_errno = 0;
586 info.si_code = BUS_ADRALN;
587 info.si_addr = (void __user *) sp;
588 info.si_trapno = 0;
589 force_sig_info(SIGBUS, &info, current);
590}
591
1da177e4
LT		 592void fault_in_user_windows(void)
593{
594 struct thread_info *t = current_thread_info();
595 unsigned long window;
596 int winsize = sizeof(struct reg_window);
597 int bias = 0;
598
599 if (test_thread_flag(TIF_32BIT))
600 winsize = sizeof(struct reg_window32);
601 else
602 bias = STACK_BIAS;
603
604 flush_user_windows();
605 window = get_thread_wsaved();
606
314ef685 607 if (likely(window != 0)) {
1da177e4
LT		 608 window -= 1;
609 do {
610 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
611 struct reg_window *rwin = &t->reg_window[window];
612
314ef685
DM		 613 if (unlikely(sp & 0x7UL))
614 stack_unaligned(sp);
615
616 if (unlikely(copy_to_user((char __user *)sp,
617 rwin, winsize)))
1da177e4
LT		 618 goto barf;
619 } while (window--);
620 }
621 set_thread_wsaved(0);
622 return;
623
624barf:
625 set_thread_wsaved(window + 1);
626 do_exit(SIGILL);
627}
628
629asmlinkage long sparc_do_fork(unsigned long clone_flags,
630 unsigned long stack_start,
631 struct pt_regs *regs,
632 unsigned long stack_size)
633{
634 int __user *parent_tid_ptr, *child_tid_ptr;
1e38c126
DM		 635 unsigned long orig_i1 = regs->u_regs[UREG_I1];
636 long ret;
1da177e4
LT		 637
638#ifdef CONFIG_COMPAT
639 if (test_thread_flag(TIF_32BIT)) {
640 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
641 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
642 } else
643#endif
644 {
645 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
646 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
647 }
648
1e38c126
DM		 649 ret = do_fork(clone_flags, stack_start,
650 regs, stack_size,
651 parent_tid_ptr, child_tid_ptr);
652
653 /* If we get an error and potentially restart the system
654 * call, we're screwed because copy_thread() clobbered
655 * the parent's %o1. So detect that case and restore it
656 * here.
657 */
658 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
659 regs->u_regs[UREG_I1] = orig_i1;
660
661 return ret;
1da177e4
LT		 662}
663
664/* Copy a Sparc thread. The fork() return value conventions
665 * under SunOS are nothing short of bletcherous:
666 * Parent --> %o0 == childs pid, %o1 == 0
667 * Child --> %o0 == parents pid, %o1 == 1
668 */
669int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
670 unsigned long unused,
671 struct task_struct *p, struct pt_regs *regs)
672{
ee3eea16 673 struct thread_info *t = task_thread_info(p);
a051bc5b
DM		 674 struct sparc_stackf *parent_sf;
675 unsigned long child_stack_sz;
1da177e4 676 char *child_trap_frame;
a051bc5b 677 int kernel_thread;
1da177e4 678
a051bc5b
DM		 679 kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0;
680 parent_sf = ((struct sparc_stackf *) regs) - 1;
1da177e4 681
a051bc5b
DM		 682 /* Calculate offset to stack_frame & pt_regs */
683 child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) +
684 (kernel_thread ? STACKFRAME_SZ : 0));
685 child_trap_frame = (task_stack_page(p) +
686 (THREAD_SIZE - child_stack_sz));
687 memcpy(child_trap_frame, parent_sf, child_stack_sz);
688
689 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) |
690 (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
1da177e4 691 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
db7d9a4e 692 t->new_child = 1;
1da177e4 693 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
a051bc5b
DM		 694 t->kregs = (struct pt_regs *) (child_trap_frame +
695 sizeof(struct sparc_stackf));
1da177e4
LT		 696 t->fpsaved[0] = 0;
697
a051bc5b
DM		 698 if (kernel_thread) {
699 struct sparc_stackf *child_sf = (struct sparc_stackf *)
700 (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ));
701
702 /* Zero terminate the stack backtrace. */
703 child_sf->fp = NULL;
704 t->kregs->u_regs[UREG_FP] =
705 ((unsigned long) child_sf) - STACK_BIAS;
706
1da177e4 707 /* Special case, if we are spawning a kernel thread from
184b6c76
JB		 708 * a userspace task (usermode helper, NFS or similar), we
709 * must disable performance counters in the child because
710 * the address space and protection realm are changing.
1da177e4
LT		 711 */
712 if (t->flags & _TIF_PERFCTR) {
713 t->user_cntd0 = t->user_cntd1 = NULL;
714 t->pcr_reg = 0;
715 t->flags &= ~_TIF_PERFCTR;
716 }
1da177e4 717 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
1da177e4
LT		 718 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
719 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
720 } else {
721 if (t->flags & _TIF_32BIT) {
722 sp &= 0x00000000ffffffffUL;
723 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
724 }
725 t->kregs->u_regs[UREG_FP] = sp;
726 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
727 if (sp != regs->u_regs[UREG_FP]) {
728 unsigned long csp;
729
730 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
731 if (!csp)
732 return -EFAULT;
733 t->kregs->u_regs[UREG_FP] = csp;
734 }
735 if (t->utraps)
736 t->utraps[0]++;
737 }
738
739 /* Set the return value for the child. */
740 t->kregs->u_regs[UREG_I0] = current->pid;
741 t->kregs->u_regs[UREG_I1] = 1;
742
743 /* Set the second return value for the parent. */
744 regs->u_regs[UREG_I1] = 0;
745
746 if (clone_flags & CLONE_SETTLS)
747 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
748
749 return 0;
750}
751
752/*
753 * This is the mechanism for creating a new kernel thread.
754 *
755 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
756 * who haven't done an "execve()") should use this: it will work within
757 * a system call from a "real" process, but the process memory space will
e5dd42e4 758 * not be freed until both the parent and the child have exited.
1da177e4
LT		 759 */
760pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
761{
762 long retval;
763
764 /* If the parent runs before fn(arg) is called by the child,
765 * the input registers of this function can be clobbered.
766 * So we stash 'fn' and 'arg' into global registers which
767 * will not be modified by the parent.
768 */
769 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
770 "mov %5, %%g3\n\t" /* Save ARG into global */
771 "mov %1, %%g1\n\t" /* Clone syscall nr. */
772 "mov %2, %%o0\n\t" /* Clone flags. */
773 "mov 0, %%o1\n\t" /* usp arg == 0 */
774 "t 0x6d\n\t" /* Linux/Sparc clone(). */
775 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
776 " mov %%o0, %0\n\t"
777 "jmpl %%g2, %%o7\n\t" /* Call the function. */
778 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
779 "mov %3, %%g1\n\t"
780 "t 0x6d\n\t" /* Linux/Sparc exit(). */
781 /* Notreached by child. */
782 "1:" :
783 "=r" (retval) :
784 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
785 "i" (__NR_exit), "r" (fn), "r" (arg) :
786 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
787 return retval;
788}
789
1da177e4
LT		 790typedef struct {
791 union {
792 unsigned int pr_regs[32];
793 unsigned long pr_dregs[16];
794 } pr_fr;
795 unsigned int __unused;
796 unsigned int pr_fsr;
797 unsigned char pr_qcnt;
798 unsigned char pr_q_entrysize;
799 unsigned char pr_en;
800 unsigned int pr_q[64];
801} elf_fpregset_t32;
802
803/*
804 * fill in the fpu structure for a core dump.
805 */
806int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
807{
808 unsigned long *kfpregs = current_thread_info()->fpregs;
809 unsigned long fprs = current_thread_info()->fpsaved[0];
810
811 if (test_thread_flag(TIF_32BIT)) {
812 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
813
814 if (fprs & FPRS_DL)
815 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
816 sizeof(unsigned int) * 32);
817 else
818 memset(&fpregs32->pr_fr.pr_regs[0], 0,
819 sizeof(unsigned int) * 32);
820 fpregs32->pr_qcnt = 0;
821 fpregs32->pr_q_entrysize = 8;
822 memset(&fpregs32->pr_q[0], 0,
823 (sizeof(unsigned int) * 64));
824 if (fprs & FPRS_FEF) {
825 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
826 fpregs32->pr_en = 1;
827 } else {
828 fpregs32->pr_fsr = 0;
829 fpregs32->pr_en = 0;
830 }
831 } else {
832 if(fprs & FPRS_DL)
833 memcpy(&fpregs->pr_regs[0], kfpregs,
834 sizeof(unsigned int) * 32);
835 else
836 memset(&fpregs->pr_regs[0], 0,
837 sizeof(unsigned int) * 32);
838 if(fprs & FPRS_DU)
839 memcpy(&fpregs->pr_regs[16], kfpregs+16,
840 sizeof(unsigned int) * 32);
841 else
842 memset(&fpregs->pr_regs[16], 0,
843 sizeof(unsigned int) * 32);
844 if(fprs & FPRS_FEF) {
845 fpregs->pr_fsr = current_thread_info()->xfsr[0];
846 fpregs->pr_gsr = current_thread_info()->gsr[0];
847 } else {
848 fpregs->pr_fsr = fpregs->pr_gsr = 0;
849 }
850 fpregs->pr_fprs = fprs;
851 }
852 return 1;
853}
854
855/*
856 * sparc_execve() executes a new program after the asm stub has set
857 * things up for us. This should basically do what I want it to.
858 */
859asmlinkage int sparc_execve(struct pt_regs *regs)
860{
861 int error, base = 0;
862 char *filename;
863
864 /* User register window flush is done by entry.S */
865
866 /* Check for indirect call. */
867 if (regs->u_regs[UREG_G1] == 0)
868 base = 1;
869
870 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
871 error = PTR_ERR(filename);
872 if (IS_ERR(filename))
873 goto out;
874 error = do_execve(filename,
875 (char __user * __user *)
876 regs->u_regs[base + UREG_I1],
877 (char __user * __user *)
878 regs->u_regs[base + UREG_I2], regs);
879 putname(filename);
880 if (!error) {
881 fprs_write(0);
882 current_thread_info()->xfsr[0] = 0;
883 current_thread_info()->fpsaved[0] = 0;
884 regs->tstate &= ~TSTATE_PEF;
1da177e4
LT		 885 }
886out:
887 return error;
888}
889
890unsigned long get_wchan(struct task_struct *task)
891{
892 unsigned long pc, fp, bias = 0;
893 unsigned long thread_info_base;
894 struct reg_window *rw;
895 unsigned long ret = 0;
896 int count = 0;
897
898 if (!task || task == current ||
899 task->state == TASK_RUNNING)
900 goto out;
901
ee3eea16 902 thread_info_base = (unsigned long) task_stack_page(task);
1da177e4 903 bias = STACK_BIAS;
f3169641 904 fp = task_thread_info(task)->ksp + bias;
1da177e4
LT		 905
906 do {
907 /* Bogus frame pointer? */
908 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
909 fp >= (thread_info_base + THREAD_SIZE))
910 break;
911 rw = (struct reg_window *) fp;
912 pc = rw->ins[7];
913 if (!in_sched_functions(pc)) {
914 ret = pc;
915 goto out;
916 }
917 fp = rw->ins[6] + bias;
918 } while (++count < 16);
919
920out:
921 return ret;
922}
Linux kernel - Deliverables
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