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[PATCH] powerpc: task_thread_info()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / ppc / kernel / process.c
CommitLineData
1da177e4
LT		 1/*
2 * arch/ppc/kernel/process.c
3 *
4 * Derived from "arch/i386/kernel/process.c"
5 * Copyright (C) 1995 Linus Torvalds
6 *
7 * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and
8 * Paul Mackerras (paulus@cs.anu.edu.au)
9 *
10 * PowerPC version
11 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 */
19
20#include <linux/config.h>
21#include <linux/errno.h>
22#include <linux/sched.h>
23#include <linux/kernel.h>
24#include <linux/mm.h>
25#include <linux/smp.h>
26#include <linux/smp_lock.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/slab.h>
31#include <linux/user.h>
32#include <linux/elf.h>
33#include <linux/init.h>
34#include <linux/prctl.h>
35#include <linux/init_task.h>
36#include <linux/module.h>
37#include <linux/kallsyms.h>
38#include <linux/mqueue.h>
39#include <linux/hardirq.h>
40
41#include <asm/pgtable.h>
42#include <asm/uaccess.h>
43#include <asm/system.h>
44#include <asm/io.h>
45#include <asm/processor.h>
46#include <asm/mmu.h>
47#include <asm/prom.h>
48
49extern unsigned long _get_SP(void);
50
51struct task_struct *last_task_used_math = NULL;
52struct task_struct *last_task_used_altivec = NULL;
53struct task_struct *last_task_used_spe = NULL;
54
55static struct fs_struct init_fs = INIT_FS;
56static struct files_struct init_files = INIT_FILES;
57static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
58static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
59struct mm_struct init_mm = INIT_MM(init_mm);
60EXPORT_SYMBOL(init_mm);
61
62/* this is 8kB-aligned so we can get to the thread_info struct
63 at the base of it from the stack pointer with 1 integer instruction. */
64union thread_union init_thread_union
65 __attribute__((__section__(".data.init_task"))) =
66{ INIT_THREAD_INFO(init_task) };
67
68/* initial task structure */
69struct task_struct init_task = INIT_TASK(init_task);
70EXPORT_SYMBOL(init_task);
71
72/* only used to get secondary processor up */
73struct task_struct *current_set[NR_CPUS] = {&init_task, };
74
75#undef SHOW_TASK_SWITCHES
76#undef CHECK_STACK
77
78#if defined(CHECK_STACK)
79unsigned long
80kernel_stack_top(struct task_struct *tsk)
81{
82 return ((unsigned long)tsk) + sizeof(union task_union);
83}
84
85unsigned long
86task_top(struct task_struct *tsk)
87{
88 return ((unsigned long)tsk) + sizeof(struct thread_info);
89}
90
91/* check to make sure the kernel stack is healthy */
92int check_stack(struct task_struct *tsk)
93{
94 unsigned long stack_top = kernel_stack_top(tsk);
95 unsigned long tsk_top = task_top(tsk);
96 int ret = 0;
97
98#if 0
99 /* check thread magic */
100 if ( tsk->thread.magic != THREAD_MAGIC )
101 {
102 ret |= 1;
103 printk("thread.magic bad: %08x\n", tsk->thread.magic);
104 }
105#endif
106
107 if ( !tsk )
108 printk("check_stack(): tsk bad tsk %p\n",tsk);
109
110 /* check if stored ksp is bad */
111 if ( (tsk->thread.ksp > stack_top) || (tsk->thread.ksp < tsk_top) )
112 {
113 printk("stack out of bounds: %s/%d\n"
114 " tsk_top %08lx ksp %08lx stack_top %08lx\n",
115 tsk->comm,tsk->pid,
116 tsk_top, tsk->thread.ksp, stack_top);
117 ret |= 2;
118 }
119
120 /* check if stack ptr RIGHT NOW is bad */
121 if ( (tsk == current) && ((_get_SP() > stack_top ) || (_get_SP() < tsk_top)) )
122 {
123 printk("current stack ptr out of bounds: %s/%d\n"
124 " tsk_top %08lx sp %08lx stack_top %08lx\n",
125 current->comm,current->pid,
126 tsk_top, _get_SP(), stack_top);
127 ret |= 4;
128 }
129
130#if 0
131 /* check amount of free stack */
132 for ( i = (unsigned long *)task_top(tsk) ; i < kernel_stack_top(tsk) ; i++ )
133 {
134 if ( !i )
135 printk("check_stack(): i = %p\n", i);
136 if ( *i != 0 )
137 {
138 /* only notify if it's less than 900 bytes */
139 if ( (i - (unsigned long *)task_top(tsk)) < 900 )
140 printk("%d bytes free on stack\n",
141 i - task_top(tsk));
142 break;
143 }
144 }
145#endif
146
147 if (ret)
148 {
149 panic("bad kernel stack");
150 }
151 return(ret);
152}
153#endif /* defined(CHECK_STACK) */
154
7ac59c62
PM		 155/*
156 * Make sure the floating-point register state in the
157 * the thread_struct is up to date for task tsk.
158 */
159void flush_fp_to_thread(struct task_struct *tsk)
1da177e4 160{
7ac59c62
PM		 161 if (tsk->thread.regs) {
162 /*
163 * We need to disable preemption here because if we didn't,
164 * another process could get scheduled after the regs->msr
165 * test but before we have finished saving the FP registers
166 * to the thread_struct. That process could take over the
167 * FPU, and then when we get scheduled again we would store
168 * bogus values for the remaining FP registers.
169 */
170 preempt_disable();
171 if (tsk->thread.regs->msr & MSR_FP) {
172#ifdef CONFIG_SMP
173 /*
174 * This should only ever be called for current or
175 * for a stopped child process. Since we save away
176 * the FP register state on context switch on SMP,
177 * there is something wrong if a stopped child appears
178 * to still have its FP state in the CPU registers.
179 */
180 BUG_ON(tsk != current);
181#endif
182 giveup_fpu(current);
183 }
184 preempt_enable();
185 }
186}
187
188void enable_kernel_fp(void)
189{
190 WARN_ON(preemptible());
191
192#ifdef CONFIG_SMP
193 if (current->thread.regs && (current->thread.regs->msr & MSR_FP))
194 giveup_fpu(current);
195 else
196 giveup_fpu(NULL); /* just enables FP for kernel */
197#else
198 giveup_fpu(last_task_used_math);
199#endif /* CONFIG_SMP */
200}
201EXPORT_SYMBOL(enable_kernel_fp);
202
203int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
204{
205 preempt_disable();
206 if (tsk->thread.regs && (tsk->thread.regs->msr & MSR_FP))
207 giveup_fpu(tsk);
208 preempt_enable();
209 memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs));
1da177e4
LT		 210 return 1;
211}
212
7ac59c62
PM		 213#ifdef CONFIG_ALTIVEC
214void enable_kernel_altivec(void)
1da177e4
LT		 215{
216 WARN_ON(preemptible());
217
218#ifdef CONFIG_SMP
219 if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))
220 giveup_altivec(current);
221 else
222 giveup_altivec(NULL); /* just enable AltiVec for kernel - force */
223#else
224 giveup_altivec(last_task_used_altivec);
225#endif /* __SMP __ */
226}
227EXPORT_SYMBOL(enable_kernel_altivec);
1da177e4 228
7ac59c62
PM		 229/*
230 * Make sure the VMX/Altivec register state in the
231 * the thread_struct is up to date for task tsk.
232 */
233void flush_altivec_to_thread(struct task_struct *tsk)
1da177e4 234{
7ac59c62
PM		 235 if (tsk->thread.regs) {
236 preempt_disable();
237 if (tsk->thread.regs->msr & MSR_VEC) {
238#ifdef CONFIG_SMP
239 BUG_ON(tsk != current);
240#endif
241 giveup_altivec(current);
242 }
243 preempt_enable();
244 }
245}
246
247int dump_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
248{
249 if (regs->msr & MSR_VEC)
250 giveup_altivec(current);
251 memcpy(vrregs, &current->thread.vr[0], sizeof(*vrregs));
1da177e4
LT		 252 return 1;
253}
7ac59c62 254#endif /* CONFIG_ALTIVEC */
1da177e4 255
7ac59c62 256#ifdef CONFIG_SPE
1da177e4
LT		 257void
258enable_kernel_spe(void)
259{
260 WARN_ON(preemptible());
261
262#ifdef CONFIG_SMP
263 if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
264 giveup_spe(current);
265 else
266 giveup_spe(NULL); /* just enable SPE for kernel - force */
267#else
268 giveup_spe(last_task_used_spe);
269#endif /* __SMP __ */
270}
271EXPORT_SYMBOL(enable_kernel_spe);
1da177e4 272
7ac59c62 273void flush_spe_to_thread(struct task_struct *tsk)
1da177e4 274{
7ac59c62
PM		 275 if (tsk->thread.regs) {
276 preempt_disable();
277 if (tsk->thread.regs->msr & MSR_SPE) {
1da177e4 278#ifdef CONFIG_SMP
7ac59c62
PM		 279 BUG_ON(tsk != current);
280#endif
281 giveup_spe(current);
282 }
283 preempt_enable();
284 }
1da177e4 285}
1da177e4 286
7ac59c62 287int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs)
1da177e4 288{
7ac59c62
PM		 289 if (regs->msr & MSR_SPE)
290 giveup_spe(current);
291 /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */
292 memcpy(evrregs, &current->thread.evr[0], sizeof(u32) * 35);
1da177e4
LT		 293 return 1;
294}
7ac59c62 295#endif /* CONFIG_SPE */
1da177e4
LT		 296
297struct task_struct *__switch_to(struct task_struct *prev,
298 struct task_struct *new)
299{
300 struct thread_struct *new_thread, *old_thread;
301 unsigned long s;
302 struct task_struct *last;
303
304 local_irq_save(s);
305#ifdef CHECK_STACK
306 check_stack(prev);
307 check_stack(new);
308#endif
309
310#ifdef CONFIG_SMP
311 /* avoid complexity of lazy save/restore of fpu
312 * by just saving it every time we switch out if
313 * this task used the fpu during the last quantum.
314 *
315 * If it tries to use the fpu again, it'll trap and
316 * reload its fp regs. So we don't have to do a restore
317 * every switch, just a save.
318 * -- Cort
319 */
320 if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP))
321 giveup_fpu(prev);
322#ifdef CONFIG_ALTIVEC
323 /*
324 * If the previous thread used altivec in the last quantum
325 * (thus changing altivec regs) then save them.
326 * We used to check the VRSAVE register but not all apps
327 * set it, so we don't rely on it now (and in fact we need
328 * to save & restore VSCR even if VRSAVE == 0). -- paulus
329 *
330 * On SMP we always save/restore altivec regs just to avoid the
331 * complexity of changing processors.
332 * -- Cort
333 */
334 if ((prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)))
335 giveup_altivec(prev);
336#endif /* CONFIG_ALTIVEC */
337#ifdef CONFIG_SPE
338 /*
339 * If the previous thread used spe in the last quantum
340 * (thus changing spe regs) then save them.
341 *
342 * On SMP we always save/restore spe regs just to avoid the
343 * complexity of changing processors.
344 */
345 if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
346 giveup_spe(prev);
347#endif /* CONFIG_SPE */
348#endif /* CONFIG_SMP */
349
434cc69f 350#ifdef CONFIG_ALTIVEC
1da177e4
LT		 351 /* Avoid the trap. On smp this this never happens since
352 * we don't set last_task_used_altivec -- Cort
353 */
354 if (new->thread.regs && last_task_used_altivec == new)
355 new->thread.regs->msr |= MSR_VEC;
434cc69f 356#endif
1da177e4
LT		 357#ifdef CONFIG_SPE
358 /* Avoid the trap. On smp this this never happens since
359 * we don't set last_task_used_spe
360 */
361 if (new->thread.regs && last_task_used_spe == new)
362 new->thread.regs->msr |= MSR_SPE;
363#endif /* CONFIG_SPE */
364 new_thread = &new->thread;
365 old_thread = &current->thread;
366 last = _switch(old_thread, new_thread);
367 local_irq_restore(s);
368 return last;
369}
370
371void show_regs(struct pt_regs * regs)
372{
373 int i, trap;
374
375 printk("NIP: %08lX LR: %08lX SP: %08lX REGS: %p TRAP: %04lx %s\n",
376 regs->nip, regs->link, regs->gpr[1], regs, regs->trap,
377 print_tainted());
378 printk("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
379 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
380 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
381 regs->msr&MSR_IR ? 1 : 0,
382 regs->msr&MSR_DR ? 1 : 0);
383 trap = TRAP(regs);
384 if (trap == 0x300 || trap == 0x600)
385 printk("DAR: %08lX, DSISR: %08lX\n", regs->dar, regs->dsisr);
386 printk("TASK = %p[%d] '%s' THREAD: %p\n",
b5e2fc1c 387 current, current->pid, current->comm, task_thread_info(current));
1da177e4
LT		 388 printk("Last syscall: %ld ", current->thread.last_syscall);
389
390#ifdef CONFIG_SMP
391 printk(" CPU: %d", smp_processor_id());
392#endif /* CONFIG_SMP */
393
394 for (i = 0; i < 32; i++) {
395 long r;
396 if ((i % 8) == 0)
397 printk("\n" KERN_INFO "GPR%02d: ", i);
398 if (__get_user(r, &regs->gpr[i]))
399 break;
400 printk("%08lX ", r);
401 if (i == 12 && !FULL_REGS(regs))
402 break;
403 }
404 printk("\n");
405#ifdef CONFIG_KALLSYMS
406 /*
407 * Lookup NIP late so we have the best change of getting the
408 * above info out without failing
409 */
410 printk("NIP [%08lx] ", regs->nip);
411 print_symbol("%s\n", regs->nip);
412 printk("LR [%08lx] ", regs->link);
413 print_symbol("%s\n", regs->link);
414#endif
415 show_stack(current, (unsigned long *) regs->gpr[1]);
416}
417
418void exit_thread(void)
419{
9f232a12 420 preempt_disable();
1da177e4
LT		 421 if (last_task_used_math == current)
422 last_task_used_math = NULL;
423 if (last_task_used_altivec == current)
424 last_task_used_altivec = NULL;
425#ifdef CONFIG_SPE
426 if (last_task_used_spe == current)
427 last_task_used_spe = NULL;
428#endif
9f232a12 429 preempt_enable();
1da177e4
LT		 430}
431
432void flush_thread(void)
433{
9f232a12 434 preempt_disable();
1da177e4
LT		 435 if (last_task_used_math == current)
436 last_task_used_math = NULL;
437 if (last_task_used_altivec == current)
438 last_task_used_altivec = NULL;
439#ifdef CONFIG_SPE
440 if (last_task_used_spe == current)
441 last_task_used_spe = NULL;
442#endif
9f232a12 443 preempt_enable();
1da177e4
LT		 444}
445
446void
447release_thread(struct task_struct *t)
448{
449}
450
451/*
452 * This gets called before we allocate a new thread and copy
453 * the current task into it.
454 */
455void prepare_to_copy(struct task_struct *tsk)
456{
457 struct pt_regs *regs = tsk->thread.regs;
458
459 if (regs == NULL)
460 return;
461 preempt_disable();
462 if (regs->msr & MSR_FP)
463 giveup_fpu(current);
464#ifdef CONFIG_ALTIVEC
465 if (regs->msr & MSR_VEC)
466 giveup_altivec(current);
467#endif /* CONFIG_ALTIVEC */
468#ifdef CONFIG_SPE
469 if (regs->msr & MSR_SPE)
470 giveup_spe(current);
471#endif /* CONFIG_SPE */
472 preempt_enable();
473}
474
475/*
476 * Copy a thread..
477 */
478int
479copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
480 unsigned long unused,
481 struct task_struct *p, struct pt_regs *regs)
482{
483 struct pt_regs *childregs, *kregs;
484 extern void ret_from_fork(void);
485 unsigned long sp = (unsigned long)p->thread_info + THREAD_SIZE;
486 unsigned long childframe;
487
488 CHECK_FULL_REGS(regs);
489 /* Copy registers */
490 sp -= sizeof(struct pt_regs);
491 childregs = (struct pt_regs *) sp;
492 *childregs = *regs;
493 if ((childregs->msr & MSR_PR) == 0) {
494 /* for kernel thread, set `current' and stackptr in new task */
495 childregs->gpr[1] = sp + sizeof(struct pt_regs);
496 childregs->gpr[2] = (unsigned long) p;
497 p->thread.regs = NULL; /* no user register state */
498 } else {
499 childregs->gpr[1] = usp;
500 p->thread.regs = childregs;
501 if (clone_flags & CLONE_SETTLS)
502 childregs->gpr[2] = childregs->gpr[6];
503 }
504 childregs->gpr[3] = 0; /* Result from fork() */
505 sp -= STACK_FRAME_OVERHEAD;
506 childframe = sp;
507
508 /*
509 * The way this works is that at some point in the future
510 * some task will call _switch to switch to the new task.
511 * That will pop off the stack frame created below and start
512 * the new task running at ret_from_fork. The new task will
513 * do some house keeping and then return from the fork or clone
514 * system call, using the stack frame created above.
515 */
516 sp -= sizeof(struct pt_regs);
517 kregs = (struct pt_regs *) sp;
518 sp -= STACK_FRAME_OVERHEAD;
519 p->thread.ksp = sp;
520 kregs->nip = (unsigned long)ret_from_fork;
521
522 p->thread.last_syscall = -1;
523
524 return 0;
525}
526
527/*
528 * Set up a thread for executing a new program
529 */
530void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
531{
532 set_fs(USER_DS);
533 memset(regs->gpr, 0, sizeof(regs->gpr));
534 regs->ctr = 0;
535 regs->link = 0;
536 regs->xer = 0;
537 regs->ccr = 0;
538 regs->mq = 0;
539 regs->nip = nip;
540 regs->gpr[1] = sp;
541 regs->msr = MSR_USER;
9f232a12 542 preempt_disable();
1da177e4
LT		 543 if (last_task_used_math == current)
544 last_task_used_math = NULL;
545 if (last_task_used_altivec == current)
546 last_task_used_altivec = NULL;
547#ifdef CONFIG_SPE
548 if (last_task_used_spe == current)
549 last_task_used_spe = NULL;
550#endif
9f232a12 551 preempt_enable();
1da177e4 552 memset(current->thread.fpr, 0, sizeof(current->thread.fpr));
25c8a78b 553 current->thread.fpscr.val = 0;
1da177e4
LT		 554#ifdef CONFIG_ALTIVEC
555 memset(current->thread.vr, 0, sizeof(current->thread.vr));
556 memset(&current->thread.vscr, 0, sizeof(current->thread.vscr));
557 current->thread.vrsave = 0;
558 current->thread.used_vr = 0;
559#endif /* CONFIG_ALTIVEC */
560#ifdef CONFIG_SPE
561 memset(current->thread.evr, 0, sizeof(current->thread.evr));
562 current->thread.acc = 0;
563 current->thread.spefscr = 0;
564 current->thread.used_spe = 0;
565#endif /* CONFIG_SPE */
566}
567
568#define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
569 | PR_FP_EXC_RES | PR_FP_EXC_INV)
570
571int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
572{
573 struct pt_regs *regs = tsk->thread.regs;
574
575 /* This is a bit hairy. If we are an SPE enabled processor
576 * (have embedded fp) we store the IEEE exception enable flags in
577 * fpexc_mode. fpexc_mode is also used for setting FP exception
578 * mode (asyn, precise, disabled) for 'Classic' FP. */
579 if (val & PR_FP_EXC_SW_ENABLE) {
580#ifdef CONFIG_SPE
581 tsk->thread.fpexc_mode = val &
582 (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
583#else
584 return -EINVAL;
585#endif
586 } else {
587 /* on a CONFIG_SPE this does not hurt us. The bits that
588 * __pack_fe01 use do not overlap with bits used for
589 * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
590 * on CONFIG_SPE implementations are reserved so writing to
591 * them does not change anything */
592 if (val > PR_FP_EXC_PRECISE)
593 return -EINVAL;
594 tsk->thread.fpexc_mode = __pack_fe01(val);
595 if (regs != NULL && (regs->msr & MSR_FP) != 0)
596 regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1))
597 | tsk->thread.fpexc_mode;
598 }
599 return 0;
600}
601
602int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
603{
604 unsigned int val;
605
606 if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
607#ifdef CONFIG_SPE
608 val = tsk->thread.fpexc_mode;
609#else
610 return -EINVAL;
611#endif
612 else
613 val = __unpack_fe01(tsk->thread.fpexc_mode);
614 return put_user(val, (unsigned int __user *) adr);
615}
616
617int sys_clone(unsigned long clone_flags, unsigned long usp,
618 int __user *parent_tidp, void __user *child_threadptr,
619 int __user *child_tidp, int p6,
620 struct pt_regs *regs)
621{
622 CHECK_FULL_REGS(regs);
623 if (usp == 0)
624 usp = regs->gpr[1]; /* stack pointer for child */
625 return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
626}
627
fd582ec8
PM		 628int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
629 unsigned long p4, unsigned long p5, unsigned long p6,
1da177e4
LT		 630 struct pt_regs *regs)
631{
632 CHECK_FULL_REGS(regs);
633 return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);
634}
635
fd582ec8
PM		 636int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
637 unsigned long p4, unsigned long p5, unsigned long p6,
1da177e4
LT		 638 struct pt_regs *regs)
639{
640 CHECK_FULL_REGS(regs);
641 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1],
642 regs, 0, NULL, NULL);
643}
644
645int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
646 unsigned long a3, unsigned long a4, unsigned long a5,
647 struct pt_regs *regs)
648{
649 int error;
650 char * filename;
651
652 filename = getname((char __user *) a0);
653 error = PTR_ERR(filename);
654 if (IS_ERR(filename))
655 goto out;
656 preempt_disable();
657 if (regs->msr & MSR_FP)
658 giveup_fpu(current);
659#ifdef CONFIG_ALTIVEC
660 if (regs->msr & MSR_VEC)
661 giveup_altivec(current);
662#endif /* CONFIG_ALTIVEC */
663#ifdef CONFIG_SPE
664 if (regs->msr & MSR_SPE)
665 giveup_spe(current);
666#endif /* CONFIG_SPE */
667 preempt_enable();
668 error = do_execve(filename, (char __user *__user *) a1,
669 (char __user *__user *) a2, regs);
670 if (error == 0) {
671 task_lock(current);
672 current->ptrace &= ~PT_DTRACE;
673 task_unlock(current);
674 }
675 putname(filename);
676out:
677 return error;
678}
679
680void dump_stack(void)
681{
682 show_stack(current, NULL);
683}
684
685EXPORT_SYMBOL(dump_stack);
686
687void show_stack(struct task_struct *tsk, unsigned long *stack)
688{
689 unsigned long sp, stack_top, prev_sp, ret;
690 int count = 0;
691 unsigned long next_exc = 0;
692 struct pt_regs *regs;
693 extern char ret_from_except, ret_from_except_full, ret_from_syscall;
694
695 sp = (unsigned long) stack;
696 if (tsk == NULL)
697 tsk = current;
698 if (sp == 0) {
699 if (tsk == current)
700 asm("mr %0,1" : "=r" (sp));
701 else
702 sp = tsk->thread.ksp;
703 }
704
705 prev_sp = (unsigned long) (tsk->thread_info + 1);
706 stack_top = (unsigned long) tsk->thread_info + THREAD_SIZE;
707 while (count < 16 && sp > prev_sp && sp < stack_top && (sp & 3) == 0) {
708 if (count == 0) {
709 printk("Call trace:");
710#ifdef CONFIG_KALLSYMS
711 printk("\n");
712#endif
713 } else {
714 if (next_exc) {
715 ret = next_exc;
716 next_exc = 0;
717 } else
718 ret = *(unsigned long *)(sp + 4);
719 printk(" [%08lx] ", ret);
720#ifdef CONFIG_KALLSYMS
721 print_symbol("%s", ret);
722 printk("\n");
723#endif
724 if (ret == (unsigned long) &ret_from_except
725 || ret == (unsigned long) &ret_from_except_full
726 || ret == (unsigned long) &ret_from_syscall) {
727 /* sp + 16 points to an exception frame */
728 regs = (struct pt_regs *) (sp + 16);
729 if (sp + 16 + sizeof(*regs) <= stack_top)
730 next_exc = regs->nip;
731 }
732 }
733 ++count;
734 sp = *(unsigned long *)sp;
735 }
736#ifndef CONFIG_KALLSYMS
737 if (count > 0)
738 printk("\n");
739#endif
740}
741
742#if 0
743/*
744 * Low level print for debugging - Cort
745 */
746int __init ll_printk(const char *fmt, ...)
747{
748 va_list args;
749 char buf[256];
750 int i;
751
752 va_start(args, fmt);
753 i=vsprintf(buf,fmt,args);
754 ll_puts(buf);
755 va_end(args);
756 return i;
757}
758
759int lines = 24, cols = 80;
760int orig_x = 0, orig_y = 0;
761
762void puthex(unsigned long val)
763{
764 unsigned char buf[10];
765 int i;
766 for (i = 7; i >= 0; i--)
767 {
768 buf[i] = "0123456789ABCDEF"[val & 0x0F];
769 val >>= 4;
770 }
771 buf[8] = '\0';
772 prom_print(buf);
773}
774
775void __init ll_puts(const char *s)
776{
777 int x,y;
778 char *vidmem = (char *)/*(_ISA_MEM_BASE + 0xB8000) */0xD00B8000;
779 char c;
780 extern int mem_init_done;
781
782 if ( mem_init_done ) /* assume this means we can printk */
783 {
784 printk(s);
785 return;
786 }
787
788#if 0
789 if ( have_of )
790 {
791 prom_print(s);
792 return;
793 }
794#endif
795
796 /*
797 * can't ll_puts on chrp without openfirmware yet.
798 * vidmem just needs to be setup for it.
799 * -- Cort
800 */
801 if ( _machine != _MACH_prep )
802 return;
803 x = orig_x;
804 y = orig_y;
805
806 while ( ( c = *s++ ) != '\0' ) {
807 if ( c == '\n' ) {
808 x = 0;
809 if ( ++y >= lines ) {
810 /*scroll();*/
811 /*y--;*/
812 y = 0;
813 }
814 } else {
815 vidmem [ ( x + cols * y ) * 2 ] = c;
816 if ( ++x >= cols ) {
817 x = 0;
818 if ( ++y >= lines ) {
819 /*scroll();*/
820 /*y--;*/
821 y = 0;
822 }
823 }
824 }
825 }
826
827 orig_x = x;
828 orig_y = y;
829}
830#endif
831
832unsigned long get_wchan(struct task_struct *p)
833{
834 unsigned long ip, sp;
835 unsigned long stack_page = (unsigned long) p->thread_info;
836 int count = 0;
837 if (!p || p == current || p->state == TASK_RUNNING)
838 return 0;
839 sp = p->thread.ksp;
840 do {
841 sp = *(unsigned long *)sp;
842 if (sp < stack_page || sp >= stack_page + 8188)
843 return 0;
844 if (count > 0) {
845 ip = *(unsigned long *)(sp + 4);
846 if (!in_sched_functions(ip))
847 return ip;
848 }
849 } while (count++ < 16);
850 return 0;
851}
kernel source for telekom puls (alcatel/mediatek)