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[PATCH] powerpc: work around sparse warnings in cputable.h
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / powerpc / kernel / process.c
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14cf11af 1/*
14cf11af
PM		 2 * Derived from "arch/i386/kernel/process.c"
3 * Copyright (C) 1995 Linus Torvalds
4 *
5 * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and
6 * Paul Mackerras (paulus@cs.anu.edu.au)
7 *
8 * PowerPC version
9 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17#include <linux/config.h>
18#include <linux/errno.h>
19#include <linux/sched.h>
20#include <linux/kernel.h>
21#include <linux/mm.h>
22#include <linux/smp.h>
23#include <linux/smp_lock.h>
24#include <linux/stddef.h>
25#include <linux/unistd.h>
26#include <linux/ptrace.h>
27#include <linux/slab.h>
28#include <linux/user.h>
29#include <linux/elf.h>
30#include <linux/init.h>
31#include <linux/prctl.h>
32#include <linux/init_task.h>
33#include <linux/module.h>
34#include <linux/kallsyms.h>
35#include <linux/mqueue.h>
36#include <linux/hardirq.h>
06d67d54 37#include <linux/utsname.h>
14cf11af
PM		 38
39#include <asm/pgtable.h>
40#include <asm/uaccess.h>
41#include <asm/system.h>
42#include <asm/io.h>
43#include <asm/processor.h>
44#include <asm/mmu.h>
45#include <asm/prom.h>
76032de8 46#include <asm/machdep.h>
c6622f63 47#include <asm/time.h>
06d67d54
PM		 48#ifdef CONFIG_PPC64
49#include <asm/firmware.h>
06d67d54 50#endif
14cf11af
PM		 51
52extern unsigned long _get_SP(void);
53
54#ifndef CONFIG_SMP
55struct task_struct *last_task_used_math = NULL;
56struct task_struct *last_task_used_altivec = NULL;
57struct task_struct *last_task_used_spe = NULL;
58#endif
59
14cf11af
PM		 60/*
61 * Make sure the floating-point register state in the
62 * the thread_struct is up to date for task tsk.
63 */
64void flush_fp_to_thread(struct task_struct *tsk)
65{
66 if (tsk->thread.regs) {
67 /*
68 * We need to disable preemption here because if we didn't,
69 * another process could get scheduled after the regs->msr
70 * test but before we have finished saving the FP registers
71 * to the thread_struct. That process could take over the
72 * FPU, and then when we get scheduled again we would store
73 * bogus values for the remaining FP registers.
74 */
75 preempt_disable();
76 if (tsk->thread.regs->msr & MSR_FP) {
77#ifdef CONFIG_SMP
78 /*
79 * This should only ever be called for current or
80 * for a stopped child process. Since we save away
81 * the FP register state on context switch on SMP,
82 * there is something wrong if a stopped child appears
83 * to still have its FP state in the CPU registers.
84 */
85 BUG_ON(tsk != current);
86#endif
87 giveup_fpu(current);
88 }
89 preempt_enable();
90 }
91}
92
93void enable_kernel_fp(void)
94{
95 WARN_ON(preemptible());
96
97#ifdef CONFIG_SMP
98 if (current->thread.regs && (current->thread.regs->msr & MSR_FP))
99 giveup_fpu(current);
100 else
101 giveup_fpu(NULL); /* just enables FP for kernel */
102#else
103 giveup_fpu(last_task_used_math);
104#endif /* CONFIG_SMP */
105}
106EXPORT_SYMBOL(enable_kernel_fp);
107
108int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
109{
110 if (!tsk->thread.regs)
111 return 0;
112 flush_fp_to_thread(current);
113
114 memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs));
115
116 return 1;
117}
118
119#ifdef CONFIG_ALTIVEC
120void enable_kernel_altivec(void)
121{
122 WARN_ON(preemptible());
123
124#ifdef CONFIG_SMP
125 if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))
126 giveup_altivec(current);
127 else
128 giveup_altivec(NULL); /* just enable AltiVec for kernel - force */
129#else
130 giveup_altivec(last_task_used_altivec);
131#endif /* CONFIG_SMP */
132}
133EXPORT_SYMBOL(enable_kernel_altivec);
134
135/*
136 * Make sure the VMX/Altivec register state in the
137 * the thread_struct is up to date for task tsk.
138 */
139void flush_altivec_to_thread(struct task_struct *tsk)
140{
141 if (tsk->thread.regs) {
142 preempt_disable();
143 if (tsk->thread.regs->msr & MSR_VEC) {
144#ifdef CONFIG_SMP
145 BUG_ON(tsk != current);
146#endif
147 giveup_altivec(current);
148 }
149 preempt_enable();
150 }
151}
152
153int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
154{
155 flush_altivec_to_thread(current);
156 memcpy(vrregs, &current->thread.vr[0], sizeof(*vrregs));
157 return 1;
158}
159#endif /* CONFIG_ALTIVEC */
160
161#ifdef CONFIG_SPE
162
163void enable_kernel_spe(void)
164{
165 WARN_ON(preemptible());
166
167#ifdef CONFIG_SMP
168 if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
169 giveup_spe(current);
170 else
171 giveup_spe(NULL); /* just enable SPE for kernel - force */
172#else
173 giveup_spe(last_task_used_spe);
174#endif /* __SMP __ */
175}
176EXPORT_SYMBOL(enable_kernel_spe);
177
178void flush_spe_to_thread(struct task_struct *tsk)
179{
180 if (tsk->thread.regs) {
181 preempt_disable();
182 if (tsk->thread.regs->msr & MSR_SPE) {
183#ifdef CONFIG_SMP
184 BUG_ON(tsk != current);
185#endif
186 giveup_spe(current);
187 }
188 preempt_enable();
189 }
190}
191
192int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs)
193{
194 flush_spe_to_thread(current);
195 /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */
196 memcpy(evrregs, &current->thread.evr[0], sizeof(u32) * 35);
197 return 1;
198}
199#endif /* CONFIG_SPE */
200
5388fb10 201#ifndef CONFIG_SMP
48abec07
PM		 202/*
203 * If we are doing lazy switching of CPU state (FP, altivec or SPE),
204 * and the current task has some state, discard it.
205 */
5388fb10 206void discard_lazy_cpu_state(void)
48abec07 207{
48abec07
PM		 208 preempt_disable();
209 if (last_task_used_math == current)
210 last_task_used_math = NULL;
211#ifdef CONFIG_ALTIVEC
212 if (last_task_used_altivec == current)
213 last_task_used_altivec = NULL;
214#endif /* CONFIG_ALTIVEC */
215#ifdef CONFIG_SPE
216 if (last_task_used_spe == current)
217 last_task_used_spe = NULL;
218#endif
219 preempt_enable();
48abec07 220}
5388fb10 221#endif /* CONFIG_SMP */
48abec07 222
624cee31 223#ifdef CONFIG_PPC_MERGE /* XXX for now */
14cf11af
PM		 224int set_dabr(unsigned long dabr)
225{
cab0af98
ME		 226 if (ppc_md.set_dabr)
227 return ppc_md.set_dabr(dabr);
14cf11af 228
cab0af98
ME		 229 mtspr(SPRN_DABR, dabr);
230 return 0;
14cf11af 231}
624cee31 232#endif
14cf11af 233
06d67d54
PM		 234#ifdef CONFIG_PPC64
235DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);
14cf11af 236static DEFINE_PER_CPU(unsigned long, current_dabr);
06d67d54 237#endif
14cf11af
PM		 238
239struct task_struct *__switch_to(struct task_struct *prev,
240 struct task_struct *new)
241{
242 struct thread_struct *new_thread, *old_thread;
243 unsigned long flags;
244 struct task_struct *last;
245
246#ifdef CONFIG_SMP
247 /* avoid complexity of lazy save/restore of fpu
248 * by just saving it every time we switch out if
249 * this task used the fpu during the last quantum.
250 *
251 * If it tries to use the fpu again, it'll trap and
252 * reload its fp regs. So we don't have to do a restore
253 * every switch, just a save.
254 * -- Cort
255 */
256 if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP))
257 giveup_fpu(prev);
258#ifdef CONFIG_ALTIVEC
259 /*
260 * If the previous thread used altivec in the last quantum
261 * (thus changing altivec regs) then save them.
262 * We used to check the VRSAVE register but not all apps
263 * set it, so we don't rely on it now (and in fact we need
264 * to save & restore VSCR even if VRSAVE == 0). -- paulus
265 *
266 * On SMP we always save/restore altivec regs just to avoid the
267 * complexity of changing processors.
268 * -- Cort
269 */
270 if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC))
271 giveup_altivec(prev);
14cf11af
PM		 272#endif /* CONFIG_ALTIVEC */
273#ifdef CONFIG_SPE
274 /*
275 * If the previous thread used spe in the last quantum
276 * (thus changing spe regs) then save them.
277 *
278 * On SMP we always save/restore spe regs just to avoid the
279 * complexity of changing processors.
280 */
281 if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
282 giveup_spe(prev);
c0c0d996
PM		 283#endif /* CONFIG_SPE */
284
285#else /* CONFIG_SMP */
286#ifdef CONFIG_ALTIVEC
287 /* Avoid the trap. On smp this this never happens since
288 * we don't set last_task_used_altivec -- Cort
289 */
290 if (new->thread.regs && last_task_used_altivec == new)
291 new->thread.regs->msr |= MSR_VEC;
292#endif /* CONFIG_ALTIVEC */
293#ifdef CONFIG_SPE
14cf11af
PM		 294 /* Avoid the trap. On smp this this never happens since
295 * we don't set last_task_used_spe
296 */
297 if (new->thread.regs && last_task_used_spe == new)
298 new->thread.regs->msr |= MSR_SPE;
299#endif /* CONFIG_SPE */
c0c0d996 300
14cf11af
PM		 301#endif /* CONFIG_SMP */
302
303#ifdef CONFIG_PPC64 /* for now */
304 if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) {
305 set_dabr(new->thread.dabr);
306 __get_cpu_var(current_dabr) = new->thread.dabr;
307 }
06d67d54
PM		 308
309 flush_tlb_pending();
14cf11af
PM		 310#endif
311
312 new_thread = &new->thread;
313 old_thread = &current->thread;
06d67d54
PM		 314
315#ifdef CONFIG_PPC64
316 /*
317 * Collect processor utilization data per process
318 */
319 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
320 struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array);
321 long unsigned start_tb, current_tb;
322 start_tb = old_thread->start_tb;
323 cu->current_tb = current_tb = mfspr(SPRN_PURR);
324 old_thread->accum_tb += (current_tb - start_tb);
325 new_thread->start_tb = current_tb;
326 }
327#endif
328
14cf11af 329 local_irq_save(flags);
c6622f63
PM		 330
331 account_system_vtime(current);
332 account_process_vtime(current);
333 calculate_steal_time();
334
14cf11af
PM		 335 last = _switch(old_thread, new_thread);
336
337 local_irq_restore(flags);
338
339 return last;
340}
341
06d67d54
PM		 342static int instructions_to_print = 16;
343
344#ifdef CONFIG_PPC64
345#define BAD_PC(pc) ((REGION_ID(pc) != KERNEL_REGION_ID) && \
346 (REGION_ID(pc) != VMALLOC_REGION_ID))
347#else
348#define BAD_PC(pc) ((pc) < KERNELBASE)
349#endif
350
351static void show_instructions(struct pt_regs *regs)
352{
353 int i;
354 unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 *
355 sizeof(int));
356
357 printk("Instruction dump:");
358
359 for (i = 0; i < instructions_to_print; i++) {
360 int instr;
361
362 if (!(i % 8))
363 printk("\n");
364
365 if (BAD_PC(pc) || __get_user(instr, (unsigned int *)pc)) {
366 printk("XXXXXXXX ");
367 } else {
368 if (regs->nip == pc)
369 printk("<%08x> ", instr);
370 else
371 printk("%08x ", instr);
372 }
373
374 pc += sizeof(int);
375 }
376
377 printk("\n");
378}
379
380static struct regbit {
381 unsigned long bit;
382 const char *name;
383} msr_bits[] = {
384 {MSR_EE, "EE"},
385 {MSR_PR, "PR"},
386 {MSR_FP, "FP"},
387 {MSR_ME, "ME"},
388 {MSR_IR, "IR"},
389 {MSR_DR, "DR"},
390 {0, NULL}
391};
392
393static void printbits(unsigned long val, struct regbit *bits)
394{
395 const char *sep = "";
396
397 printk("<");
398 for (; bits->bit; ++bits)
399 if (val & bits->bit) {
400 printk("%s%s", sep, bits->name);
401 sep = ",";
402 }
403 printk(">");
404}
405
406#ifdef CONFIG_PPC64
407#define REG "%016lX"
408#define REGS_PER_LINE 4
409#define LAST_VOLATILE 13
410#else
411#define REG "%08lX"
412#define REGS_PER_LINE 8
413#define LAST_VOLATILE 12
414#endif
415
14cf11af
PM		 416void show_regs(struct pt_regs * regs)
417{
418 int i, trap;
419
06d67d54
PM		 420 printk("NIP: "REG" LR: "REG" CTR: "REG"\n",
421 regs->nip, regs->link, regs->ctr);
422 printk("REGS: %p TRAP: %04lx %s (%s)\n",
423 regs, regs->trap, print_tainted(), system_utsname.release);
424 printk("MSR: "REG" ", regs->msr);
425 printbits(regs->msr, msr_bits);
426 printk(" CR: %08lX XER: %08lX\n", regs->ccr, regs->xer);
14cf11af
PM		 427 trap = TRAP(regs);
428 if (trap == 0x300 || trap == 0x600)
06d67d54
PM		 429 printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr);
430 printk("TASK = %p[%d] '%s' THREAD: %p",
b5e2fc1c 431 current, current->pid, current->comm, task_thread_info(current));
14cf11af
PM		 432
433#ifdef CONFIG_SMP
434 printk(" CPU: %d", smp_processor_id());
435#endif /* CONFIG_SMP */
436
437 for (i = 0; i < 32; i++) {
06d67d54 438 if ((i % REGS_PER_LINE) == 0)
14cf11af 439 printk("\n" KERN_INFO "GPR%02d: ", i);
06d67d54
PM		 440 printk(REG " ", regs->gpr[i]);
441 if (i == LAST_VOLATILE && !FULL_REGS(regs))
14cf11af
PM		 442 break;
443 }
444 printk("\n");
445#ifdef CONFIG_KALLSYMS
446 /*
447 * Lookup NIP late so we have the best change of getting the
448 * above info out without failing
449 */
06d67d54 450 printk("NIP ["REG"] ", regs->nip);
14cf11af 451 print_symbol("%s\n", regs->nip);
06d67d54 452 printk("LR ["REG"] ", regs->link);
14cf11af
PM		 453 print_symbol("%s\n", regs->link);
454#endif
455 show_stack(current, (unsigned long *) regs->gpr[1]);
06d67d54
PM		 456 if (!user_mode(regs))
457 show_instructions(regs);
14cf11af
PM		 458}
459
460void exit_thread(void)
461{
48abec07 462 discard_lazy_cpu_state();
14cf11af
PM		 463}
464
465void flush_thread(void)
466{
06d67d54
PM		 467#ifdef CONFIG_PPC64
468 struct thread_info *t = current_thread_info();
469
470 if (t->flags & _TIF_ABI_PENDING)
471 t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
472#endif
06d67d54 473
48abec07 474 discard_lazy_cpu_state();
14cf11af
PM		 475
476#ifdef CONFIG_PPC64 /* for now */
477 if (current->thread.dabr) {
478 current->thread.dabr = 0;
479 set_dabr(0);
480 }
481#endif
482}
483
484void
485release_thread(struct task_struct *t)
486{
487}
488
489/*
490 * This gets called before we allocate a new thread and copy
491 * the current task into it.
492 */
493void prepare_to_copy(struct task_struct *tsk)
494{
495 flush_fp_to_thread(current);
496 flush_altivec_to_thread(current);
497 flush_spe_to_thread(current);
498}
499
500/*
501 * Copy a thread..
502 */
06d67d54
PM		 503int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
504 unsigned long unused, struct task_struct *p,
505 struct pt_regs *regs)
14cf11af
PM		 506{
507 struct pt_regs *childregs, *kregs;
508 extern void ret_from_fork(void);
0cec6fd1 509 unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
14cf11af
PM		 510
511 CHECK_FULL_REGS(regs);
512 /* Copy registers */
513 sp -= sizeof(struct pt_regs);
514 childregs = (struct pt_regs *) sp;
515 *childregs = *regs;
516 if ((childregs->msr & MSR_PR) == 0) {
517 /* for kernel thread, set `current' and stackptr in new task */
518 childregs->gpr[1] = sp + sizeof(struct pt_regs);
06d67d54 519#ifdef CONFIG_PPC32
14cf11af 520 childregs->gpr[2] = (unsigned long) p;
06d67d54 521#else
b5e2fc1c 522 clear_tsk_thread_flag(p, TIF_32BIT);
06d67d54 523#endif
14cf11af
PM		 524 p->thread.regs = NULL; /* no user register state */
525 } else {
526 childregs->gpr[1] = usp;
527 p->thread.regs = childregs;
06d67d54
PM		 528 if (clone_flags & CLONE_SETTLS) {
529#ifdef CONFIG_PPC64
530 if (!test_thread_flag(TIF_32BIT))
531 childregs->gpr[13] = childregs->gpr[6];
532 else
533#endif
534 childregs->gpr[2] = childregs->gpr[6];
535 }
14cf11af
PM		 536 }
537 childregs->gpr[3] = 0; /* Result from fork() */
538 sp -= STACK_FRAME_OVERHEAD;
14cf11af
PM		 539
540 /*
541 * The way this works is that at some point in the future
542 * some task will call _switch to switch to the new task.
543 * That will pop off the stack frame created below and start
544 * the new task running at ret_from_fork. The new task will
545 * do some house keeping and then return from the fork or clone
546 * system call, using the stack frame created above.
547 */
548 sp -= sizeof(struct pt_regs);
549 kregs = (struct pt_regs *) sp;
550 sp -= STACK_FRAME_OVERHEAD;
551 p->thread.ksp = sp;
14cf11af 552
06d67d54
PM		 553#ifdef CONFIG_PPC64
554 if (cpu_has_feature(CPU_FTR_SLB)) {
555 unsigned long sp_vsid = get_kernel_vsid(sp);
3c726f8d 556 unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp;
06d67d54
PM		 557
558 sp_vsid <<= SLB_VSID_SHIFT;
3c726f8d 559 sp_vsid |= SLB_VSID_KERNEL | llp;
06d67d54
PM		 560 p->thread.ksp_vsid = sp_vsid;
561 }
562
563 /*
564 * The PPC64 ABI makes use of a TOC to contain function
565 * pointers. The function (ret_from_except) is actually a pointer
566 * to the TOC entry. The first entry is a pointer to the actual
567 * function.
568 */
569 kregs->nip = *((unsigned long *)ret_from_fork);
570#else
571 kregs->nip = (unsigned long)ret_from_fork;
14cf11af 572 p->thread.last_syscall = -1;
06d67d54 573#endif
14cf11af
PM		 574
575 return 0;
576}
577
578/*
579 * Set up a thread for executing a new program
580 */
06d67d54 581void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
14cf11af 582{
90eac727
ME		 583#ifdef CONFIG_PPC64
584 unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */
585#endif
586
14cf11af 587 set_fs(USER_DS);
06d67d54
PM		 588
589 /*
590 * If we exec out of a kernel thread then thread.regs will not be
591 * set. Do it now.
592 */
593 if (!current->thread.regs) {
0cec6fd1
AV		 594 struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE;
595 current->thread.regs = regs - 1;
06d67d54
PM		 596 }
597
14cf11af
PM		 598 memset(regs->gpr, 0, sizeof(regs->gpr));
599 regs->ctr = 0;
600 regs->link = 0;
601 regs->xer = 0;
602 regs->ccr = 0;
14cf11af 603 regs->gpr[1] = sp;
06d67d54
PM		 604
605#ifdef CONFIG_PPC32
606 regs->mq = 0;
607 regs->nip = start;
14cf11af 608 regs->msr = MSR_USER;
06d67d54 609#else
d4bf9a78 610 if (!test_thread_flag(TIF_32BIT)) {
90eac727 611 unsigned long entry, toc;
06d67d54
PM		 612
613 /* start is a relocated pointer to the function descriptor for
614 * the elf _start routine. The first entry in the function
615 * descriptor is the entry address of _start and the second
616 * entry is the TOC value we need to use.
617 */
618 __get_user(entry, (unsigned long __user *)start);
619 __get_user(toc, (unsigned long __user *)start+1);
620
621 /* Check whether the e_entry function descriptor entries
622 * need to be relocated before we can use them.
623 */
624 if (load_addr != 0) {
625 entry += load_addr;
626 toc += load_addr;
627 }
628 regs->nip = entry;
629 regs->gpr[2] = toc;
630 regs->msr = MSR_USER64;
d4bf9a78
SR		 631 } else {
632 regs->nip = start;
633 regs->gpr[2] = 0;
634 regs->msr = MSR_USER32;
06d67d54
PM		 635 }
636#endif
637
48abec07 638 discard_lazy_cpu_state();
14cf11af 639 memset(current->thread.fpr, 0, sizeof(current->thread.fpr));
25c8a78b 640 current->thread.fpscr.val = 0;
14cf11af
PM		 641#ifdef CONFIG_ALTIVEC
642 memset(current->thread.vr, 0, sizeof(current->thread.vr));
643 memset(&current->thread.vscr, 0, sizeof(current->thread.vscr));
06d67d54 644 current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */
14cf11af
PM		 645 current->thread.vrsave = 0;
646 current->thread.used_vr = 0;
647#endif /* CONFIG_ALTIVEC */
648#ifdef CONFIG_SPE
649 memset(current->thread.evr, 0, sizeof(current->thread.evr));
650 current->thread.acc = 0;
651 current->thread.spefscr = 0;
652 current->thread.used_spe = 0;
653#endif /* CONFIG_SPE */
654}
655
656#define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
657 | PR_FP_EXC_RES | PR_FP_EXC_INV)
658
659int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
660{
661 struct pt_regs *regs = tsk->thread.regs;
662
663 /* This is a bit hairy. If we are an SPE enabled processor
664 * (have embedded fp) we store the IEEE exception enable flags in
665 * fpexc_mode. fpexc_mode is also used for setting FP exception
666 * mode (asyn, precise, disabled) for 'Classic' FP. */
667 if (val & PR_FP_EXC_SW_ENABLE) {
668#ifdef CONFIG_SPE
669 tsk->thread.fpexc_mode = val &
670 (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
06d67d54 671 return 0;
14cf11af
PM		 672#else
673 return -EINVAL;
674#endif
14cf11af 675 }
06d67d54
PM		 676
677 /* on a CONFIG_SPE this does not hurt us. The bits that
678 * __pack_fe01 use do not overlap with bits used for
679 * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
680 * on CONFIG_SPE implementations are reserved so writing to
681 * them does not change anything */
682 if (val > PR_FP_EXC_PRECISE)
683 return -EINVAL;
684 tsk->thread.fpexc_mode = __pack_fe01(val);
685 if (regs != NULL && (regs->msr & MSR_FP) != 0)
686 regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1))
687 | tsk->thread.fpexc_mode;
14cf11af
PM		 688 return 0;
689}
690
691int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
692{
693 unsigned int val;
694
695 if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
696#ifdef CONFIG_SPE
697 val = tsk->thread.fpexc_mode;
698#else
699 return -EINVAL;
700#endif
701 else
702 val = __unpack_fe01(tsk->thread.fpexc_mode);
703 return put_user(val, (unsigned int __user *) adr);
704}
705
06d67d54
PM		 706#define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))
707
14cf11af
PM		 708int sys_clone(unsigned long clone_flags, unsigned long usp,
709 int __user *parent_tidp, void __user *child_threadptr,
710 int __user *child_tidp, int p6,
711 struct pt_regs *regs)
712{
713 CHECK_FULL_REGS(regs);
714 if (usp == 0)
715 usp = regs->gpr[1]; /* stack pointer for child */
06d67d54
PM		 716#ifdef CONFIG_PPC64
717 if (test_thread_flag(TIF_32BIT)) {
718 parent_tidp = TRUNC_PTR(parent_tidp);
719 child_tidp = TRUNC_PTR(child_tidp);
720 }
721#endif
14cf11af
PM		 722 return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
723}
724
725int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
726 unsigned long p4, unsigned long p5, unsigned long p6,
727 struct pt_regs *regs)
728{
729 CHECK_FULL_REGS(regs);
730 return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);
731}
732
733int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
734 unsigned long p4, unsigned long p5, unsigned long p6,
735 struct pt_regs *regs)
736{
737 CHECK_FULL_REGS(regs);
738 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1],
739 regs, 0, NULL, NULL);
740}
741
742int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
743 unsigned long a3, unsigned long a4, unsigned long a5,
744 struct pt_regs *regs)
745{
746 int error;
06d67d54 747 char *filename;
14cf11af
PM		 748
749 filename = getname((char __user *) a0);
750 error = PTR_ERR(filename);
751 if (IS_ERR(filename))
752 goto out;
753 flush_fp_to_thread(current);
754 flush_altivec_to_thread(current);
755 flush_spe_to_thread(current);
20c8c210
PM		 756 error = do_execve(filename, (char __user * __user *) a1,
757 (char __user * __user *) a2, regs);
14cf11af
PM		 758 if (error == 0) {
759 task_lock(current);
760 current->ptrace &= ~PT_DTRACE;
761 task_unlock(current);
762 }
763 putname(filename);
764out:
765 return error;
766}
767
768static int validate_sp(unsigned long sp, struct task_struct *p,
769 unsigned long nbytes)
770{
0cec6fd1 771 unsigned long stack_page = (unsigned long)task_stack_page(p);
14cf11af
PM		 772
773 if (sp >= stack_page + sizeof(struct thread_struct)
774 && sp <= stack_page + THREAD_SIZE - nbytes)
775 return 1;
776
777#ifdef CONFIG_IRQSTACKS
778 stack_page = (unsigned long) hardirq_ctx[task_cpu(p)];
779 if (sp >= stack_page + sizeof(struct thread_struct)
780 && sp <= stack_page + THREAD_SIZE - nbytes)
781 return 1;
782
783 stack_page = (unsigned long) softirq_ctx[task_cpu(p)];
784 if (sp >= stack_page + sizeof(struct thread_struct)
785 && sp <= stack_page + THREAD_SIZE - nbytes)
786 return 1;
787#endif
788
789 return 0;
790}
791
06d67d54
PM		 792#ifdef CONFIG_PPC64
793#define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */
794#define FRAME_LR_SAVE 2
795#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288)
796#define REGS_MARKER 0x7265677368657265ul
797#define FRAME_MARKER 12
798#else
799#define MIN_STACK_FRAME 16
800#define FRAME_LR_SAVE 1
801#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
802#define REGS_MARKER 0x72656773ul
803#define FRAME_MARKER 2
14cf11af 804#endif
14cf11af
PM		 805
806unsigned long get_wchan(struct task_struct *p)
807{
808 unsigned long ip, sp;
809 int count = 0;
810
811 if (!p || p == current || p->state == TASK_RUNNING)
812 return 0;
813
814 sp = p->thread.ksp;
06d67d54 815 if (!validate_sp(sp, p, MIN_STACK_FRAME))
14cf11af
PM		 816 return 0;
817
818 do {
819 sp = *(unsigned long *)sp;
06d67d54 820 if (!validate_sp(sp, p, MIN_STACK_FRAME))
14cf11af
PM		 821 return 0;
822 if (count > 0) {
06d67d54 823 ip = ((unsigned long *)sp)[FRAME_LR_SAVE];
14cf11af
PM		 824 if (!in_sched_functions(ip))
825 return ip;
826 }
827 } while (count++ < 16);
828 return 0;
829}
830EXPORT_SYMBOL(get_wchan);
06d67d54
PM		 831
832static int kstack_depth_to_print = 64;
833
834void show_stack(struct task_struct *tsk, unsigned long *stack)
835{
836 unsigned long sp, ip, lr, newsp;
837 int count = 0;
838 int firstframe = 1;
839
840 sp = (unsigned long) stack;
841 if (tsk == NULL)
842 tsk = current;
843 if (sp == 0) {
844 if (tsk == current)
845 asm("mr %0,1" : "=r" (sp));
846 else
847 sp = tsk->thread.ksp;
848 }
849
850 lr = 0;
851 printk("Call Trace:\n");
852 do {
853 if (!validate_sp(sp, tsk, MIN_STACK_FRAME))
854 return;
855
856 stack = (unsigned long *) sp;
857 newsp = stack[0];
858 ip = stack[FRAME_LR_SAVE];
859 if (!firstframe || ip != lr) {
860 printk("["REG"] ["REG"] ", sp, ip);
861 print_symbol("%s", ip);
862 if (firstframe)
863 printk(" (unreliable)");
864 printk("\n");
865 }
866 firstframe = 0;
867
868 /*
869 * See if this is an exception frame.
870 * We look for the "regshere" marker in the current frame.
871 */
872 if (validate_sp(sp, tsk, INT_FRAME_SIZE)
873 && stack[FRAME_MARKER] == REGS_MARKER) {
874 struct pt_regs *regs = (struct pt_regs *)
875 (sp + STACK_FRAME_OVERHEAD);
876 printk("--- Exception: %lx", regs->trap);
877 print_symbol(" at %s\n", regs->nip);
878 lr = regs->link;
879 print_symbol(" LR = %s\n", lr);
880 firstframe = 1;
881 }
882
883 sp = newsp;
884 } while (count++ < kstack_depth_to_print);
885}
886
887void dump_stack(void)
888{
889 show_stack(current, NULL);
890}
891EXPORT_SYMBOL(dump_stack);
cb2c9b27
AB		 892
893#ifdef CONFIG_PPC64
894void ppc64_runlatch_on(void)
895{
896 unsigned long ctrl;
897
898 if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) {
899 HMT_medium();
900
901 ctrl = mfspr(SPRN_CTRLF);
902 ctrl |= CTRL_RUNLATCH;
903 mtspr(SPRN_CTRLT, ctrl);
904
905 set_thread_flag(TIF_RUNLATCH);
906 }
907}
908
909void ppc64_runlatch_off(void)
910{
911 unsigned long ctrl;
912
913 if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) {
914 HMT_medium();
915
916 clear_thread_flag(TIF_RUNLATCH);
917
918 ctrl = mfspr(SPRN_CTRLF);
919 ctrl &= ~CTRL_RUNLATCH;
920 mtspr(SPRN_CTRLT, ctrl);
921 }
922}
923#endif
kernel source for telekom puls (alcatel/mediatek)