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Merge branches 'x86/xen', 'x86/build', 'x86/microcode', 'x86/mm-debug-v2', 'x86/memor...
[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 54
4f70f7a9
DM		 55#include "kstack.h"
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
dbf3e950 216void show_regs(struct pt_regs *regs)
1da177e4 217{
1da177e4
LT		 218 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
219 regs->tpc, regs->tnpc, regs->y, print_tainted());
4fe3ebec 220 printk("TPC: <%pS>\n", (void *) regs->tpc);
1da177e4
LT		 221 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
222 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
223 regs->u_regs[3]);
224 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
225 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
226 regs->u_regs[7]);
227 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
228 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
229 regs->u_regs[11]);
230 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
231 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
232 regs->u_regs[15]);
4fe3ebec 233 printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
1da177e4 234 show_regwindow(regs);
1da177e4
LT		 235}
236
93dae5b7
DM		 237struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
238static DEFINE_SPINLOCK(global_reg_snapshot_lock);
239
240static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
241 int this_cpu)
242{
243 flushw_all();
244
245 global_reg_snapshot[this_cpu].tstate = regs->tstate;
246 global_reg_snapshot[this_cpu].tpc = regs->tpc;
247 global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
248 global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
249
250 if (regs->tstate & TSTATE_PRIV) {
5afe2738 251 struct thread_info *tp = current_thread_info();
93dae5b7
DM		 252 struct reg_window *rw;
253
254 rw = (struct reg_window *)
255 (regs->u_regs[UREG_FP] + STACK_BIAS);
4f70f7a9 256 if (kstack_valid(tp, (unsigned long) rw)) {
5afe2738
DM		 257 global_reg_snapshot[this_cpu].i7 = rw->ins[7];
258 rw = (struct reg_window *)
259 (rw->ins[6] + STACK_BIAS);
4f70f7a9 260 if (kstack_valid(tp, (unsigned long) rw))
5afe2738
DM		 261 global_reg_snapshot[this_cpu].rpc = rw->ins[7];
262 }
263 } else {
93dae5b7 264 global_reg_snapshot[this_cpu].i7 = 0;
5afe2738
DM		 265 global_reg_snapshot[this_cpu].rpc = 0;
266 }
93dae5b7
DM		 267 global_reg_snapshot[this_cpu].thread = tp;
268}
269
270/* In order to avoid hangs we do not try to synchronize with the
271 * global register dump client cpus. The last store they make is to
272 * the thread pointer, so do a short poll waiting for that to become
273 * non-NULL.
274 */
275static void __global_reg_poll(struct global_reg_snapshot *gp)
276{
277 int limit = 0;
278
279 while (!gp->thread && ++limit < 100) {
280 barrier();
281 udelay(1);
282 }
283}
284
09ee167c 285void __trigger_all_cpu_backtrace(void)
93dae5b7
DM		 286{
287 struct thread_info *tp = current_thread_info();
288 struct pt_regs *regs = get_irq_regs();
93dae5b7
DM		 289 unsigned long flags;
290 int this_cpu, cpu;
291
292 if (!regs)
293 regs = tp->kregs;
294
295 spin_lock_irqsave(&global_reg_snapshot_lock, flags);
296
297 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
298
299 this_cpu = raw_smp_processor_id();
300
301 __global_reg_self(tp, regs, this_cpu);
302
303 smp_fetch_global_regs();
304
305 for_each_online_cpu(cpu) {
306 struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
307 struct thread_info *tp;
308
309 __global_reg_poll(gp);
310
311 tp = gp->thread;
312 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
313 (cpu == this_cpu ? '*' : ' '), cpu,
314 gp->tstate, gp->tpc, gp->tnpc,
315 ((tp && tp->task) ? tp->task->comm : "NULL"),
316 ((tp && tp->task) ? tp->task->pid : -1));
4fe3ebec 317
93dae5b7 318 if (gp->tstate & TSTATE_PRIV) {
5afe2738 319 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
4fe3ebec
DM		 320 (void *) gp->tpc,
321 (void *) gp->o7,
5afe2738
DM		 322 (void *) gp->i7,
323 (void *) gp->rpc);
4fe3ebec 324 } else {
5afe2738
DM		 325 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
326 gp->tpc, gp->o7, gp->i7, gp->rpc);
93dae5b7
DM		 327 }
328 }
329
330 memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
331
332 spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
333}
334
09ee167c
DM		 335#ifdef CONFIG_MAGIC_SYSRQ
336
337static void sysrq_handle_globreg(int key, struct tty_struct *tty)
338{
339 __trigger_all_cpu_backtrace();
340}
341
93dae5b7
DM		 342static struct sysrq_key_op sparc_globalreg_op = {
343 .handler = sysrq_handle_globreg,
344 .help_msg = "Globalregs",
345 .action_msg = "Show Global CPU Regs",
346};
347
348static int __init sparc_globreg_init(void)
349{
350 return register_sysrq_key('y', &sparc_globalreg_op);
351}
352
353core_initcall(sparc_globreg_init);
354
355#endif
356
1da177e4
LT		 357unsigned long thread_saved_pc(struct task_struct *tsk)
358{
f3169641 359 struct thread_info *ti = task_thread_info(tsk);
1da177e4
LT		 360 unsigned long ret = 0xdeadbeefUL;
361
362 if (ti && ti->ksp) {
363 unsigned long *sp;
364 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
365 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
366 sp[14]) {
367 unsigned long *fp;
368 fp = (unsigned long *)(sp[14] + STACK_BIAS);
369 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
370 ret = fp[15];
371 }
372 }
373 return ret;
374}
375
376/* Free current thread data structures etc.. */
377void exit_thread(void)
378{
379 struct thread_info *t = current_thread_info();
380
381 if (t->utraps) {
382 if (t->utraps[0] < 2)
383 kfree (t->utraps);
384 else
385 t->utraps[0]--;
386 }
387
388 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
389 t->user_cntd0 = t->user_cntd1 = NULL;
390 t->pcr_reg = 0;
391 write_pcr(0);
392 }
393}
394
395void flush_thread(void)
396{
397 struct thread_info *t = current_thread_info();
74bf4312 398 struct mm_struct *mm;
1da177e4 399
c0a79b22
MD		 400 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
401 clear_ti_thread_flag(t, TIF_ABI_PENDING);
402 if (test_ti_thread_flag(t, TIF_32BIT))
403 clear_ti_thread_flag(t, TIF_32BIT);
404 else
405 set_ti_thread_flag(t, TIF_32BIT);
406 }
1da177e4 407
74bf4312
DM		 408 mm = t->task->mm;
409 if (mm)
98c5584c 410 tsb_context_switch(mm);
1da177e4 411
1da177e4
LT		 412 set_thread_wsaved(0);
413
414 /* Turn off performance counters if on. */
415 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
416 t->user_cntd0 = t->user_cntd1 = NULL;
417 t->pcr_reg = 0;
418 write_pcr(0);
419 }
420
421 /* Clear FPU register state. */
422 t->fpsaved[0] = 0;
423
424 if (get_thread_current_ds() != ASI_AIUS)
425 set_fs(USER_DS);
1da177e4
LT		 426}
427
428/* It's a bit more tricky when 64-bit tasks are involved... */
429static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
430{
431 unsigned long fp, distance, rval;
432
433 if (!(test_thread_flag(TIF_32BIT))) {
434 csp += STACK_BIAS;
435 psp += STACK_BIAS;
436 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
437 fp += STACK_BIAS;
438 } else
439 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
440
441 /* Now 8-byte align the stack as this is mandatory in the
442 * Sparc ABI due to how register windows work. This hides
443 * the restriction from thread libraries etc. -DaveM
444 */
445 csp &= ~7UL;
446
447 distance = fp - psp;
448 rval = (csp - distance);
449 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
450 rval = 0;
451 else if (test_thread_flag(TIF_32BIT)) {
452 if (put_user(((u32)csp),
453 &(((struct reg_window32 __user *)rval)->ins[6])))
454 rval = 0;
455 } else {
456 if (put_user(((u64)csp - STACK_BIAS),
457 &(((struct reg_window __user *)rval)->ins[6])))
458 rval = 0;
459 else
460 rval = rval - STACK_BIAS;
461 }
462
463 return rval;
464}
465
466/* Standard stuff. */
467static inline void shift_window_buffer(int first_win, int last_win,
468 struct thread_info *t)
469{
470 int i;
471
472 for (i = first_win; i < last_win; i++) {
473 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
474 memcpy(&t->reg_window[i], &t->reg_window[i+1],
475 sizeof(struct reg_window));
476 }
477}
478
479void synchronize_user_stack(void)
480{
481 struct thread_info *t = current_thread_info();
482 unsigned long window;
483
484 flush_user_windows();
485 if ((window = get_thread_wsaved()) != 0) {
486 int winsize = sizeof(struct reg_window);
487 int bias = 0;
488
489 if (test_thread_flag(TIF_32BIT))
490 winsize = sizeof(struct reg_window32);
491 else
492 bias = STACK_BIAS;
493
494 window -= 1;
495 do {
496 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
497 struct reg_window *rwin = &t->reg_window[window];
498
499 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
500 shift_window_buffer(window, get_thread_wsaved() - 1, t);
501 set_thread_wsaved(get_thread_wsaved() - 1);
502 }
503 } while (window--);
504 }
505}
506
314ef685
DM		 507static void stack_unaligned(unsigned long sp)
508{
509 siginfo_t info;
510
511 info.si_signo = SIGBUS;
512 info.si_errno = 0;
513 info.si_code = BUS_ADRALN;
514 info.si_addr = (void __user *) sp;
515 info.si_trapno = 0;
516 force_sig_info(SIGBUS, &info, current);
517}
518
1da177e4
LT		 519void fault_in_user_windows(void)
520{
521 struct thread_info *t = current_thread_info();
522 unsigned long window;
523 int winsize = sizeof(struct reg_window);
524 int bias = 0;
525
526 if (test_thread_flag(TIF_32BIT))
527 winsize = sizeof(struct reg_window32);
528 else
529 bias = STACK_BIAS;
530
531 flush_user_windows();
532 window = get_thread_wsaved();
533
314ef685 534 if (likely(window != 0)) {
1da177e4
LT		 535 window -= 1;
536 do {
537 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
538 struct reg_window *rwin = &t->reg_window[window];
539
314ef685
DM		 540 if (unlikely(sp & 0x7UL))
541 stack_unaligned(sp);
542
543 if (unlikely(copy_to_user((char __user *)sp,
544 rwin, winsize)))
1da177e4
LT		 545 goto barf;
546 } while (window--);
547 }
548 set_thread_wsaved(0);
549 return;
550
551barf:
552 set_thread_wsaved(window + 1);
553 do_exit(SIGILL);
554}
555
556asmlinkage long sparc_do_fork(unsigned long clone_flags,
557 unsigned long stack_start,
558 struct pt_regs *regs,
559 unsigned long stack_size)
560{
561 int __user *parent_tid_ptr, *child_tid_ptr;
1e38c126
DM		 562 unsigned long orig_i1 = regs->u_regs[UREG_I1];
563 long ret;
1da177e4
LT		 564
565#ifdef CONFIG_COMPAT
566 if (test_thread_flag(TIF_32BIT)) {
567 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
568 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
569 } else
570#endif
571 {
572 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
573 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
574 }
575
1e38c126
DM		 576 ret = do_fork(clone_flags, stack_start,
577 regs, stack_size,
578 parent_tid_ptr, child_tid_ptr);
579
580 /* If we get an error and potentially restart the system
581 * call, we're screwed because copy_thread() clobbered
582 * the parent's %o1. So detect that case and restore it
583 * here.
584 */
585 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
586 regs->u_regs[UREG_I1] = orig_i1;
587
588 return ret;
1da177e4
LT		 589}
590
591/* Copy a Sparc thread. The fork() return value conventions
592 * under SunOS are nothing short of bletcherous:
593 * Parent --> %o0 == childs pid, %o1 == 0
594 * Child --> %o0 == parents pid, %o1 == 1
595 */
596int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
597 unsigned long unused,
598 struct task_struct *p, struct pt_regs *regs)
599{
ee3eea16 600 struct thread_info *t = task_thread_info(p);
a051bc5b
DM		 601 struct sparc_stackf *parent_sf;
602 unsigned long child_stack_sz;
1da177e4 603 char *child_trap_frame;
a051bc5b 604 int kernel_thread;
1da177e4 605
a051bc5b
DM		 606 kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0;
607 parent_sf = ((struct sparc_stackf *) regs) - 1;
1da177e4 608
a051bc5b
DM		 609 /* Calculate offset to stack_frame & pt_regs */
610 child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) +
611 (kernel_thread ? STACKFRAME_SZ : 0));
612 child_trap_frame = (task_stack_page(p) +
613 (THREAD_SIZE - child_stack_sz));
614 memcpy(child_trap_frame, parent_sf, child_stack_sz);
615
616 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) |
617 (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
1da177e4 618 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
db7d9a4e 619 t->new_child = 1;
1da177e4 620 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
a051bc5b
DM		 621 t->kregs = (struct pt_regs *) (child_trap_frame +
622 sizeof(struct sparc_stackf));
1da177e4
LT		 623 t->fpsaved[0] = 0;
624
a051bc5b
DM		 625 if (kernel_thread) {
626 struct sparc_stackf *child_sf = (struct sparc_stackf *)
627 (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ));
628
629 /* Zero terminate the stack backtrace. */
630 child_sf->fp = NULL;
631 t->kregs->u_regs[UREG_FP] =
632 ((unsigned long) child_sf) - STACK_BIAS;
633
1da177e4 634 /* Special case, if we are spawning a kernel thread from
184b6c76
JB		 635 * a userspace task (usermode helper, NFS or similar), we
636 * must disable performance counters in the child because
637 * the address space and protection realm are changing.
1da177e4
LT		 638 */
639 if (t->flags & _TIF_PERFCTR) {
640 t->user_cntd0 = t->user_cntd1 = NULL;
641 t->pcr_reg = 0;
642 t->flags &= ~_TIF_PERFCTR;
643 }
1da177e4 644 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
1da177e4
LT		 645 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
646 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
647 } else {
648 if (t->flags & _TIF_32BIT) {
649 sp &= 0x00000000ffffffffUL;
650 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
651 }
652 t->kregs->u_regs[UREG_FP] = sp;
653 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
654 if (sp != regs->u_regs[UREG_FP]) {
655 unsigned long csp;
656
657 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
658 if (!csp)
659 return -EFAULT;
660 t->kregs->u_regs[UREG_FP] = csp;
661 }
662 if (t->utraps)
663 t->utraps[0]++;
664 }
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/*
680 * This is the mechanism for creating a new kernel thread.
681 *
682 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
683 * who haven't done an "execve()") should use this: it will work within
684 * a system call from a "real" process, but the process memory space will
e5dd42e4 685 * not be freed until both the parent and the child have exited.
1da177e4
LT		 686 */
687pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
688{
689 long retval;
690
691 /* If the parent runs before fn(arg) is called by the child,
692 * the input registers of this function can be clobbered.
693 * So we stash 'fn' and 'arg' into global registers which
694 * will not be modified by the parent.
695 */
696 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
697 "mov %5, %%g3\n\t" /* Save ARG into global */
698 "mov %1, %%g1\n\t" /* Clone syscall nr. */
699 "mov %2, %%o0\n\t" /* Clone flags. */
700 "mov 0, %%o1\n\t" /* usp arg == 0 */
701 "t 0x6d\n\t" /* Linux/Sparc clone(). */
702 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
703 " mov %%o0, %0\n\t"
704 "jmpl %%g2, %%o7\n\t" /* Call the function. */
705 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
706 "mov %3, %%g1\n\t"
707 "t 0x6d\n\t" /* Linux/Sparc exit(). */
708 /* Notreached by child. */
709 "1:" :
710 "=r" (retval) :
711 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
712 "i" (__NR_exit), "r" (fn), "r" (arg) :
713 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
714 return retval;
715}
716
1da177e4
LT		 717typedef struct {
718 union {
719 unsigned int pr_regs[32];
720 unsigned long pr_dregs[16];
721 } pr_fr;
722 unsigned int __unused;
723 unsigned int pr_fsr;
724 unsigned char pr_qcnt;
725 unsigned char pr_q_entrysize;
726 unsigned char pr_en;
727 unsigned int pr_q[64];
728} elf_fpregset_t32;
729
730/*
731 * fill in the fpu structure for a core dump.
732 */
733int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
734{
735 unsigned long *kfpregs = current_thread_info()->fpregs;
736 unsigned long fprs = current_thread_info()->fpsaved[0];
737
738 if (test_thread_flag(TIF_32BIT)) {
739 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
740
741 if (fprs & FPRS_DL)
742 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
743 sizeof(unsigned int) * 32);
744 else
745 memset(&fpregs32->pr_fr.pr_regs[0], 0,
746 sizeof(unsigned int) * 32);
747 fpregs32->pr_qcnt = 0;
748 fpregs32->pr_q_entrysize = 8;
749 memset(&fpregs32->pr_q[0], 0,
750 (sizeof(unsigned int) * 64));
751 if (fprs & FPRS_FEF) {
752 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
753 fpregs32->pr_en = 1;
754 } else {
755 fpregs32->pr_fsr = 0;
756 fpregs32->pr_en = 0;
757 }
758 } else {
759 if(fprs & FPRS_DL)
760 memcpy(&fpregs->pr_regs[0], kfpregs,
761 sizeof(unsigned int) * 32);
762 else
763 memset(&fpregs->pr_regs[0], 0,
764 sizeof(unsigned int) * 32);
765 if(fprs & FPRS_DU)
766 memcpy(&fpregs->pr_regs[16], kfpregs+16,
767 sizeof(unsigned int) * 32);
768 else
769 memset(&fpregs->pr_regs[16], 0,
770 sizeof(unsigned int) * 32);
771 if(fprs & FPRS_FEF) {
772 fpregs->pr_fsr = current_thread_info()->xfsr[0];
773 fpregs->pr_gsr = current_thread_info()->gsr[0];
774 } else {
775 fpregs->pr_fsr = fpregs->pr_gsr = 0;
776 }
777 fpregs->pr_fprs = fprs;
778 }
779 return 1;
780}
781
782/*
783 * sparc_execve() executes a new program after the asm stub has set
784 * things up for us. This should basically do what I want it to.
785 */
786asmlinkage int sparc_execve(struct pt_regs *regs)
787{
788 int error, base = 0;
789 char *filename;
790
791 /* User register window flush is done by entry.S */
792
793 /* Check for indirect call. */
794 if (regs->u_regs[UREG_G1] == 0)
795 base = 1;
796
797 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
798 error = PTR_ERR(filename);
799 if (IS_ERR(filename))
800 goto out;
801 error = do_execve(filename,
802 (char __user * __user *)
803 regs->u_regs[base + UREG_I1],
804 (char __user * __user *)
805 regs->u_regs[base + UREG_I2], regs);
806 putname(filename);
807 if (!error) {
808 fprs_write(0);
809 current_thread_info()->xfsr[0] = 0;
810 current_thread_info()->fpsaved[0] = 0;
811 regs->tstate &= ~TSTATE_PEF;
1da177e4
LT		 812 }
813out:
814 return error;
815}
816
817unsigned long get_wchan(struct task_struct *task)
818{
819 unsigned long pc, fp, bias = 0;
4f70f7a9 820 struct thread_info *tp;
1da177e4
LT		 821 struct reg_window *rw;
822 unsigned long ret = 0;
823 int count = 0;
824
825 if (!task || task == current ||
826 task->state == TASK_RUNNING)
827 goto out;
828
4f70f7a9 829 tp = task_thread_info(task);
1da177e4 830 bias = STACK_BIAS;
f3169641 831 fp = task_thread_info(task)->ksp + bias;
1da177e4
LT		 832
833 do {
4f70f7a9 834 if (!kstack_valid(tp, fp))
1da177e4
LT		 835 break;
836 rw = (struct reg_window *) fp;
837 pc = rw->ins[7];
838 if (!in_sched_functions(pc)) {
839 ret = pc;
840 goto out;
841 }
842 fp = rw->ins[6] + bias;
843 } while (++count < 16);
844
845out:
846 return ret;
847}
Linux kernel - Deliverables
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