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[PATCH] Add a prctl to change the endianness of a process.
[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>
a7f31841 48#include <asm/syscalls.h>
06d67d54
PM		 49#ifdef CONFIG_PPC64
50#include <asm/firmware.h>
06d67d54 51#endif
14cf11af
PM		 52
53extern unsigned long _get_SP(void);
54
55#ifndef CONFIG_SMP
56struct task_struct *last_task_used_math = NULL;
57struct task_struct *last_task_used_altivec = NULL;
58struct task_struct *last_task_used_spe = NULL;
59#endif
60
14cf11af
PM		 61/*
62 * Make sure the floating-point register state in the
63 * the thread_struct is up to date for task tsk.
64 */
65void flush_fp_to_thread(struct task_struct *tsk)
66{
67 if (tsk->thread.regs) {
68 /*
69 * We need to disable preemption here because if we didn't,
70 * another process could get scheduled after the regs->msr
71 * test but before we have finished saving the FP registers
72 * to the thread_struct. That process could take over the
73 * FPU, and then when we get scheduled again we would store
74 * bogus values for the remaining FP registers.
75 */
76 preempt_disable();
77 if (tsk->thread.regs->msr & MSR_FP) {
78#ifdef CONFIG_SMP
79 /*
80 * This should only ever be called for current or
81 * for a stopped child process. Since we save away
82 * the FP register state on context switch on SMP,
83 * there is something wrong if a stopped child appears
84 * to still have its FP state in the CPU registers.
85 */
86 BUG_ON(tsk != current);
87#endif
88 giveup_fpu(current);
89 }
90 preempt_enable();
91 }
92}
93
94void enable_kernel_fp(void)
95{
96 WARN_ON(preemptible());
97
98#ifdef CONFIG_SMP
99 if (current->thread.regs && (current->thread.regs->msr & MSR_FP))
100 giveup_fpu(current);
101 else
102 giveup_fpu(NULL); /* just enables FP for kernel */
103#else
104 giveup_fpu(last_task_used_math);
105#endif /* CONFIG_SMP */
106}
107EXPORT_SYMBOL(enable_kernel_fp);
108
109int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
110{
111 if (!tsk->thread.regs)
112 return 0;
113 flush_fp_to_thread(current);
114
115 memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs));
116
117 return 1;
118}
119
120#ifdef CONFIG_ALTIVEC
121void enable_kernel_altivec(void)
122{
123 WARN_ON(preemptible());
124
125#ifdef CONFIG_SMP
126 if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))
127 giveup_altivec(current);
128 else
129 giveup_altivec(NULL); /* just enable AltiVec for kernel - force */
130#else
131 giveup_altivec(last_task_used_altivec);
132#endif /* CONFIG_SMP */
133}
134EXPORT_SYMBOL(enable_kernel_altivec);
135
136/*
137 * Make sure the VMX/Altivec register state in the
138 * the thread_struct is up to date for task tsk.
139 */
140void flush_altivec_to_thread(struct task_struct *tsk)
141{
142 if (tsk->thread.regs) {
143 preempt_disable();
144 if (tsk->thread.regs->msr & MSR_VEC) {
145#ifdef CONFIG_SMP
146 BUG_ON(tsk != current);
147#endif
148 giveup_altivec(current);
149 }
150 preempt_enable();
151 }
152}
153
154int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
155{
156 flush_altivec_to_thread(current);
157 memcpy(vrregs, &current->thread.vr[0], sizeof(*vrregs));
158 return 1;
159}
160#endif /* CONFIG_ALTIVEC */
161
162#ifdef CONFIG_SPE
163
164void enable_kernel_spe(void)
165{
166 WARN_ON(preemptible());
167
168#ifdef CONFIG_SMP
169 if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
170 giveup_spe(current);
171 else
172 giveup_spe(NULL); /* just enable SPE for kernel - force */
173#else
174 giveup_spe(last_task_used_spe);
175#endif /* __SMP __ */
176}
177EXPORT_SYMBOL(enable_kernel_spe);
178
179void flush_spe_to_thread(struct task_struct *tsk)
180{
181 if (tsk->thread.regs) {
182 preempt_disable();
183 if (tsk->thread.regs->msr & MSR_SPE) {
184#ifdef CONFIG_SMP
185 BUG_ON(tsk != current);
186#endif
187 giveup_spe(current);
188 }
189 preempt_enable();
190 }
191}
192
193int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs)
194{
195 flush_spe_to_thread(current);
196 /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */
197 memcpy(evrregs, &current->thread.evr[0], sizeof(u32) * 35);
198 return 1;
199}
200#endif /* CONFIG_SPE */
201
5388fb10 202#ifndef CONFIG_SMP
48abec07
PM		 203/*
204 * If we are doing lazy switching of CPU state (FP, altivec or SPE),
205 * and the current task has some state, discard it.
206 */
5388fb10 207void discard_lazy_cpu_state(void)
48abec07 208{
48abec07
PM		 209 preempt_disable();
210 if (last_task_used_math == current)
211 last_task_used_math = NULL;
212#ifdef CONFIG_ALTIVEC
213 if (last_task_used_altivec == current)
214 last_task_used_altivec = NULL;
215#endif /* CONFIG_ALTIVEC */
216#ifdef CONFIG_SPE
217 if (last_task_used_spe == current)
218 last_task_used_spe = NULL;
219#endif
220 preempt_enable();
48abec07 221}
5388fb10 222#endif /* CONFIG_SMP */
48abec07 223
624cee31 224#ifdef CONFIG_PPC_MERGE /* XXX for now */
14cf11af
PM		 225int set_dabr(unsigned long dabr)
226{
cab0af98
ME		 227 if (ppc_md.set_dabr)
228 return ppc_md.set_dabr(dabr);
14cf11af 229
cab0af98
ME		 230 mtspr(SPRN_DABR, dabr);
231 return 0;
14cf11af 232}
624cee31 233#endif
14cf11af 234
06d67d54
PM		 235#ifdef CONFIG_PPC64
236DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);
14cf11af 237static DEFINE_PER_CPU(unsigned long, current_dabr);
06d67d54 238#endif
14cf11af
PM		 239
240struct task_struct *__switch_to(struct task_struct *prev,
241 struct task_struct *new)
242{
243 struct thread_struct *new_thread, *old_thread;
244 unsigned long flags;
245 struct task_struct *last;
246
247#ifdef CONFIG_SMP
248 /* avoid complexity of lazy save/restore of fpu
249 * by just saving it every time we switch out if
250 * this task used the fpu during the last quantum.
251 *
252 * If it tries to use the fpu again, it'll trap and
253 * reload its fp regs. So we don't have to do a restore
254 * every switch, just a save.
255 * -- Cort
256 */
257 if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP))
258 giveup_fpu(prev);
259#ifdef CONFIG_ALTIVEC
260 /*
261 * If the previous thread used altivec in the last quantum
262 * (thus changing altivec regs) then save them.
263 * We used to check the VRSAVE register but not all apps
264 * set it, so we don't rely on it now (and in fact we need
265 * to save & restore VSCR even if VRSAVE == 0). -- paulus
266 *
267 * On SMP we always save/restore altivec regs just to avoid the
268 * complexity of changing processors.
269 * -- Cort
270 */
271 if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC))
272 giveup_altivec(prev);
14cf11af
PM		 273#endif /* CONFIG_ALTIVEC */
274#ifdef CONFIG_SPE
275 /*
276 * If the previous thread used spe in the last quantum
277 * (thus changing spe regs) then save them.
278 *
279 * On SMP we always save/restore spe regs just to avoid the
280 * complexity of changing processors.
281 */
282 if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
283 giveup_spe(prev);
c0c0d996
PM		 284#endif /* CONFIG_SPE */
285
286#else /* CONFIG_SMP */
287#ifdef CONFIG_ALTIVEC
288 /* Avoid the trap. On smp this this never happens since
289 * we don't set last_task_used_altivec -- Cort
290 */
291 if (new->thread.regs && last_task_used_altivec == new)
292 new->thread.regs->msr |= MSR_VEC;
293#endif /* CONFIG_ALTIVEC */
294#ifdef CONFIG_SPE
14cf11af
PM		 295 /* Avoid the trap. On smp this this never happens since
296 * we don't set last_task_used_spe
297 */
298 if (new->thread.regs && last_task_used_spe == new)
299 new->thread.regs->msr |= MSR_SPE;
300#endif /* CONFIG_SPE */
c0c0d996 301
14cf11af
PM		 302#endif /* CONFIG_SMP */
303
304#ifdef CONFIG_PPC64 /* for now */
305 if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) {
306 set_dabr(new->thread.dabr);
307 __get_cpu_var(current_dabr) = new->thread.dabr;
308 }
06d67d54
PM		 309
310 flush_tlb_pending();
14cf11af
PM		 311#endif
312
313 new_thread = &new->thread;
314 old_thread = &current->thread;
06d67d54
PM		 315
316#ifdef CONFIG_PPC64
317 /*
318 * Collect processor utilization data per process
319 */
320 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
321 struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array);
322 long unsigned start_tb, current_tb;
323 start_tb = old_thread->start_tb;
324 cu->current_tb = current_tb = mfspr(SPRN_PURR);
325 old_thread->accum_tb += (current_tb - start_tb);
326 new_thread->start_tb = current_tb;
327 }
328#endif
329
14cf11af 330 local_irq_save(flags);
c6622f63
PM		 331
332 account_system_vtime(current);
333 account_process_vtime(current);
334 calculate_steal_time();
335
14cf11af
PM		 336 last = _switch(old_thread, new_thread);
337
338 local_irq_restore(flags);
339
340 return last;
341}
342
06d67d54
PM		 343static int instructions_to_print = 16;
344
345#ifdef CONFIG_PPC64
346#define BAD_PC(pc) ((REGION_ID(pc) != KERNEL_REGION_ID) && \
347 (REGION_ID(pc) != VMALLOC_REGION_ID))
348#else
349#define BAD_PC(pc) ((pc) < KERNELBASE)
350#endif
351
352static void show_instructions(struct pt_regs *regs)
353{
354 int i;
355 unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 *
356 sizeof(int));
357
358 printk("Instruction dump:");
359
360 for (i = 0; i < instructions_to_print; i++) {
361 int instr;
362
363 if (!(i % 8))
364 printk("\n");
365
af308377
SR		 366 /* We use __get_user here *only* to avoid an OOPS on a
367 * bad address because the pc *should* only be a
368 * kernel address.
369 */
370 if (BAD_PC(pc) || __get_user(instr, (unsigned int __user *)pc)) {
06d67d54
PM		 371 printk("XXXXXXXX ");
372 } else {
373 if (regs->nip == pc)
374 printk("<%08x> ", instr);
375 else
376 printk("%08x ", instr);
377 }
378
379 pc += sizeof(int);
380 }
381
382 printk("\n");
383}
384
385static struct regbit {
386 unsigned long bit;
387 const char *name;
388} msr_bits[] = {
389 {MSR_EE, "EE"},
390 {MSR_PR, "PR"},
391 {MSR_FP, "FP"},
392 {MSR_ME, "ME"},
393 {MSR_IR, "IR"},
394 {MSR_DR, "DR"},
395 {0, NULL}
396};
397
398static void printbits(unsigned long val, struct regbit *bits)
399{
400 const char *sep = "";
401
402 printk("<");
403 for (; bits->bit; ++bits)
404 if (val & bits->bit) {
405 printk("%s%s", sep, bits->name);
406 sep = ",";
407 }
408 printk(">");
409}
410
411#ifdef CONFIG_PPC64
412#define REG "%016lX"
413#define REGS_PER_LINE 4
414#define LAST_VOLATILE 13
415#else
416#define REG "%08lX"
417#define REGS_PER_LINE 8
418#define LAST_VOLATILE 12
419#endif
420
14cf11af
PM		 421void show_regs(struct pt_regs * regs)
422{
423 int i, trap;
424
06d67d54
PM		 425 printk("NIP: "REG" LR: "REG" CTR: "REG"\n",
426 regs->nip, regs->link, regs->ctr);
427 printk("REGS: %p TRAP: %04lx %s (%s)\n",
428 regs, regs->trap, print_tainted(), system_utsname.release);
429 printk("MSR: "REG" ", regs->msr);
430 printbits(regs->msr, msr_bits);
431 printk(" CR: %08lX XER: %08lX\n", regs->ccr, regs->xer);
14cf11af
PM		 432 trap = TRAP(regs);
433 if (trap == 0x300 || trap == 0x600)
06d67d54
PM		 434 printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr);
435 printk("TASK = %p[%d] '%s' THREAD: %p",
b5e2fc1c 436 current, current->pid, current->comm, task_thread_info(current));
14cf11af
PM		 437
438#ifdef CONFIG_SMP
439 printk(" CPU: %d", smp_processor_id());
440#endif /* CONFIG_SMP */
441
442 for (i = 0; i < 32; i++) {
06d67d54 443 if ((i % REGS_PER_LINE) == 0)
14cf11af 444 printk("\n" KERN_INFO "GPR%02d: ", i);
06d67d54
PM		 445 printk(REG " ", regs->gpr[i]);
446 if (i == LAST_VOLATILE && !FULL_REGS(regs))
14cf11af
PM		 447 break;
448 }
449 printk("\n");
450#ifdef CONFIG_KALLSYMS
451 /*
452 * Lookup NIP late so we have the best change of getting the
453 * above info out without failing
454 */
06d67d54 455 printk("NIP ["REG"] ", regs->nip);
14cf11af 456 print_symbol("%s\n", regs->nip);
06d67d54 457 printk("LR ["REG"] ", regs->link);
14cf11af
PM		 458 print_symbol("%s\n", regs->link);
459#endif
460 show_stack(current, (unsigned long *) regs->gpr[1]);
06d67d54
PM		 461 if (!user_mode(regs))
462 show_instructions(regs);
14cf11af
PM		 463}
464
465void exit_thread(void)
466{
48abec07 467 discard_lazy_cpu_state();
14cf11af
PM		 468}
469
470void flush_thread(void)
471{
06d67d54
PM		 472#ifdef CONFIG_PPC64
473 struct thread_info *t = current_thread_info();
474
475 if (t->flags & _TIF_ABI_PENDING)
476 t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
477#endif
06d67d54 478
48abec07 479 discard_lazy_cpu_state();
14cf11af
PM		 480
481#ifdef CONFIG_PPC64 /* for now */
482 if (current->thread.dabr) {
483 current->thread.dabr = 0;
484 set_dabr(0);
485 }
486#endif
487}
488
489void
490release_thread(struct task_struct *t)
491{
492}
493
494/*
495 * This gets called before we allocate a new thread and copy
496 * the current task into it.
497 */
498void prepare_to_copy(struct task_struct *tsk)
499{
500 flush_fp_to_thread(current);
501 flush_altivec_to_thread(current);
502 flush_spe_to_thread(current);
503}
504
505/*
506 * Copy a thread..
507 */
06d67d54
PM		 508int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
509 unsigned long unused, struct task_struct *p,
510 struct pt_regs *regs)
14cf11af
PM		 511{
512 struct pt_regs *childregs, *kregs;
513 extern void ret_from_fork(void);
0cec6fd1 514 unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
14cf11af
PM		 515
516 CHECK_FULL_REGS(regs);
517 /* Copy registers */
518 sp -= sizeof(struct pt_regs);
519 childregs = (struct pt_regs *) sp;
520 *childregs = *regs;
521 if ((childregs->msr & MSR_PR) == 0) {
522 /* for kernel thread, set `current' and stackptr in new task */
523 childregs->gpr[1] = sp + sizeof(struct pt_regs);
06d67d54 524#ifdef CONFIG_PPC32
14cf11af 525 childregs->gpr[2] = (unsigned long) p;
06d67d54 526#else
b5e2fc1c 527 clear_tsk_thread_flag(p, TIF_32BIT);
06d67d54 528#endif
14cf11af
PM		 529 p->thread.regs = NULL; /* no user register state */
530 } else {
531 childregs->gpr[1] = usp;
532 p->thread.regs = childregs;
06d67d54
PM		 533 if (clone_flags & CLONE_SETTLS) {
534#ifdef CONFIG_PPC64
535 if (!test_thread_flag(TIF_32BIT))
536 childregs->gpr[13] = childregs->gpr[6];
537 else
538#endif
539 childregs->gpr[2] = childregs->gpr[6];
540 }
14cf11af
PM		 541 }
542 childregs->gpr[3] = 0; /* Result from fork() */
543 sp -= STACK_FRAME_OVERHEAD;
14cf11af
PM		 544
545 /*
546 * The way this works is that at some point in the future
547 * some task will call _switch to switch to the new task.
548 * That will pop off the stack frame created below and start
549 * the new task running at ret_from_fork. The new task will
550 * do some house keeping and then return from the fork or clone
551 * system call, using the stack frame created above.
552 */
553 sp -= sizeof(struct pt_regs);
554 kregs = (struct pt_regs *) sp;
555 sp -= STACK_FRAME_OVERHEAD;
556 p->thread.ksp = sp;
14cf11af 557
06d67d54
PM		 558#ifdef CONFIG_PPC64
559 if (cpu_has_feature(CPU_FTR_SLB)) {
560 unsigned long sp_vsid = get_kernel_vsid(sp);
3c726f8d 561 unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp;
06d67d54
PM		 562
563 sp_vsid <<= SLB_VSID_SHIFT;
3c726f8d 564 sp_vsid |= SLB_VSID_KERNEL | llp;
06d67d54
PM		 565 p->thread.ksp_vsid = sp_vsid;
566 }
567
568 /*
569 * The PPC64 ABI makes use of a TOC to contain function
570 * pointers. The function (ret_from_except) is actually a pointer
571 * to the TOC entry. The first entry is a pointer to the actual
572 * function.
573 */
574 kregs->nip = *((unsigned long *)ret_from_fork);
575#else
576 kregs->nip = (unsigned long)ret_from_fork;
14cf11af 577 p->thread.last_syscall = -1;
06d67d54 578#endif
14cf11af
PM		 579
580 return 0;
581}
582
583/*
584 * Set up a thread for executing a new program
585 */
06d67d54 586void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
14cf11af 587{
90eac727
ME		 588#ifdef CONFIG_PPC64
589 unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */
590#endif
591
14cf11af 592 set_fs(USER_DS);
06d67d54
PM		 593
594 /*
595 * If we exec out of a kernel thread then thread.regs will not be
596 * set. Do it now.
597 */
598 if (!current->thread.regs) {
0cec6fd1
AV		 599 struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE;
600 current->thread.regs = regs - 1;
06d67d54
PM		 601 }
602
14cf11af
PM		 603 memset(regs->gpr, 0, sizeof(regs->gpr));
604 regs->ctr = 0;
605 regs->link = 0;
606 regs->xer = 0;
607 regs->ccr = 0;
14cf11af 608 regs->gpr[1] = sp;
06d67d54
PM		 609
610#ifdef CONFIG_PPC32
611 regs->mq = 0;
612 regs->nip = start;
14cf11af 613 regs->msr = MSR_USER;
06d67d54 614#else
d4bf9a78 615 if (!test_thread_flag(TIF_32BIT)) {
90eac727 616 unsigned long entry, toc;
06d67d54
PM		 617
618 /* start is a relocated pointer to the function descriptor for
619 * the elf _start routine. The first entry in the function
620 * descriptor is the entry address of _start and the second
621 * entry is the TOC value we need to use.
622 */
623 __get_user(entry, (unsigned long __user *)start);
624 __get_user(toc, (unsigned long __user *)start+1);
625
626 /* Check whether the e_entry function descriptor entries
627 * need to be relocated before we can use them.
628 */
629 if (load_addr != 0) {
630 entry += load_addr;
631 toc += load_addr;
632 }
633 regs->nip = entry;
634 regs->gpr[2] = toc;
635 regs->msr = MSR_USER64;
d4bf9a78
SR		 636 } else {
637 regs->nip = start;
638 regs->gpr[2] = 0;
639 regs->msr = MSR_USER32;
06d67d54
PM		 640 }
641#endif
642
48abec07 643 discard_lazy_cpu_state();
14cf11af 644 memset(current->thread.fpr, 0, sizeof(current->thread.fpr));
25c8a78b 645 current->thread.fpscr.val = 0;
14cf11af
PM		 646#ifdef CONFIG_ALTIVEC
647 memset(current->thread.vr, 0, sizeof(current->thread.vr));
648 memset(&current->thread.vscr, 0, sizeof(current->thread.vscr));
06d67d54 649 current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */
14cf11af
PM		 650 current->thread.vrsave = 0;
651 current->thread.used_vr = 0;
652#endif /* CONFIG_ALTIVEC */
653#ifdef CONFIG_SPE
654 memset(current->thread.evr, 0, sizeof(current->thread.evr));
655 current->thread.acc = 0;
656 current->thread.spefscr = 0;
657 current->thread.used_spe = 0;
658#endif /* CONFIG_SPE */
659}
660
661#define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
662 | PR_FP_EXC_RES | PR_FP_EXC_INV)
663
664int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
665{
666 struct pt_regs *regs = tsk->thread.regs;
667
668 /* This is a bit hairy. If we are an SPE enabled processor
669 * (have embedded fp) we store the IEEE exception enable flags in
670 * fpexc_mode. fpexc_mode is also used for setting FP exception
671 * mode (asyn, precise, disabled) for 'Classic' FP. */
672 if (val & PR_FP_EXC_SW_ENABLE) {
673#ifdef CONFIG_SPE
674 tsk->thread.fpexc_mode = val &
675 (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
06d67d54 676 return 0;
14cf11af
PM		 677#else
678 return -EINVAL;
679#endif
14cf11af 680 }
06d67d54
PM		 681
682 /* on a CONFIG_SPE this does not hurt us. The bits that
683 * __pack_fe01 use do not overlap with bits used for
684 * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
685 * on CONFIG_SPE implementations are reserved so writing to
686 * them does not change anything */
687 if (val > PR_FP_EXC_PRECISE)
688 return -EINVAL;
689 tsk->thread.fpexc_mode = __pack_fe01(val);
690 if (regs != NULL && (regs->msr & MSR_FP) != 0)
691 regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1))
692 | tsk->thread.fpexc_mode;
14cf11af
PM		 693 return 0;
694}
695
696int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
697{
698 unsigned int val;
699
700 if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
701#ifdef CONFIG_SPE
702 val = tsk->thread.fpexc_mode;
703#else
704 return -EINVAL;
705#endif
706 else
707 val = __unpack_fe01(tsk->thread.fpexc_mode);
708 return put_user(val, (unsigned int __user *) adr);
709}
710
06d67d54
PM		 711#define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))
712
14cf11af
PM		 713int sys_clone(unsigned long clone_flags, unsigned long usp,
714 int __user *parent_tidp, void __user *child_threadptr,
715 int __user *child_tidp, int p6,
716 struct pt_regs *regs)
717{
718 CHECK_FULL_REGS(regs);
719 if (usp == 0)
720 usp = regs->gpr[1]; /* stack pointer for child */
06d67d54
PM		 721#ifdef CONFIG_PPC64
722 if (test_thread_flag(TIF_32BIT)) {
723 parent_tidp = TRUNC_PTR(parent_tidp);
724 child_tidp = TRUNC_PTR(child_tidp);
725 }
726#endif
14cf11af
PM		 727 return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
728}
729
730int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
731 unsigned long p4, unsigned long p5, unsigned long p6,
732 struct pt_regs *regs)
733{
734 CHECK_FULL_REGS(regs);
735 return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);
736}
737
738int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
739 unsigned long p4, unsigned long p5, unsigned long p6,
740 struct pt_regs *regs)
741{
742 CHECK_FULL_REGS(regs);
743 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1],
744 regs, 0, NULL, NULL);
745}
746
747int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
748 unsigned long a3, unsigned long a4, unsigned long a5,
749 struct pt_regs *regs)
750{
751 int error;
06d67d54 752 char *filename;
14cf11af
PM		 753
754 filename = getname((char __user *) a0);
755 error = PTR_ERR(filename);
756 if (IS_ERR(filename))
757 goto out;
758 flush_fp_to_thread(current);
759 flush_altivec_to_thread(current);
760 flush_spe_to_thread(current);
20c8c210
PM		 761 error = do_execve(filename, (char __user * __user *) a1,
762 (char __user * __user *) a2, regs);
14cf11af
PM		 763 if (error == 0) {
764 task_lock(current);
765 current->ptrace &= ~PT_DTRACE;
766 task_unlock(current);
767 }
768 putname(filename);
769out:
770 return error;
771}
772
2f25194d 773int validate_sp(unsigned long sp, struct task_struct *p,
14cf11af
PM		 774 unsigned long nbytes)
775{
0cec6fd1 776 unsigned long stack_page = (unsigned long)task_stack_page(p);
14cf11af
PM		 777
778 if (sp >= stack_page + sizeof(struct thread_struct)
779 && sp <= stack_page + THREAD_SIZE - nbytes)
780 return 1;
781
782#ifdef CONFIG_IRQSTACKS
783 stack_page = (unsigned long) hardirq_ctx[task_cpu(p)];
784 if (sp >= stack_page + sizeof(struct thread_struct)
785 && sp <= stack_page + THREAD_SIZE - nbytes)
786 return 1;
787
788 stack_page = (unsigned long) softirq_ctx[task_cpu(p)];
789 if (sp >= stack_page + sizeof(struct thread_struct)
790 && sp <= stack_page + THREAD_SIZE - nbytes)
791 return 1;
792#endif
793
794 return 0;
795}
796
06d67d54
PM		 797#ifdef CONFIG_PPC64
798#define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */
799#define FRAME_LR_SAVE 2
800#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288)
801#define REGS_MARKER 0x7265677368657265ul
802#define FRAME_MARKER 12
803#else
804#define MIN_STACK_FRAME 16
805#define FRAME_LR_SAVE 1
806#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
807#define REGS_MARKER 0x72656773ul
808#define FRAME_MARKER 2
14cf11af 809#endif
14cf11af 810
2f25194d
AB		 811EXPORT_SYMBOL(validate_sp);
812
14cf11af
PM		 813unsigned long get_wchan(struct task_struct *p)
814{
815 unsigned long ip, sp;
816 int count = 0;
817
818 if (!p || p == current || p->state == TASK_RUNNING)
819 return 0;
820
821 sp = p->thread.ksp;
06d67d54 822 if (!validate_sp(sp, p, MIN_STACK_FRAME))
14cf11af
PM		 823 return 0;
824
825 do {
826 sp = *(unsigned long *)sp;
06d67d54 827 if (!validate_sp(sp, p, MIN_STACK_FRAME))
14cf11af
PM		 828 return 0;
829 if (count > 0) {
06d67d54 830 ip = ((unsigned long *)sp)[FRAME_LR_SAVE];
14cf11af
PM		 831 if (!in_sched_functions(ip))
832 return ip;
833 }
834 } while (count++ < 16);
835 return 0;
836}
06d67d54
PM		 837
838static int kstack_depth_to_print = 64;
839
840void show_stack(struct task_struct *tsk, unsigned long *stack)
841{
842 unsigned long sp, ip, lr, newsp;
843 int count = 0;
844 int firstframe = 1;
845
846 sp = (unsigned long) stack;
847 if (tsk == NULL)
848 tsk = current;
849 if (sp == 0) {
850 if (tsk == current)
851 asm("mr %0,1" : "=r" (sp));
852 else
853 sp = tsk->thread.ksp;
854 }
855
856 lr = 0;
857 printk("Call Trace:\n");
858 do {
859 if (!validate_sp(sp, tsk, MIN_STACK_FRAME))
860 return;
861
862 stack = (unsigned long *) sp;
863 newsp = stack[0];
864 ip = stack[FRAME_LR_SAVE];
865 if (!firstframe || ip != lr) {
866 printk("["REG"] ["REG"] ", sp, ip);
867 print_symbol("%s", ip);
868 if (firstframe)
869 printk(" (unreliable)");
870 printk("\n");
871 }
872 firstframe = 0;
873
874 /*
875 * See if this is an exception frame.
876 * We look for the "regshere" marker in the current frame.
877 */
878 if (validate_sp(sp, tsk, INT_FRAME_SIZE)
879 && stack[FRAME_MARKER] == REGS_MARKER) {
880 struct pt_regs *regs = (struct pt_regs *)
881 (sp + STACK_FRAME_OVERHEAD);
882 printk("--- Exception: %lx", regs->trap);
883 print_symbol(" at %s\n", regs->nip);
884 lr = regs->link;
885 print_symbol(" LR = %s\n", lr);
886 firstframe = 1;
887 }
888
889 sp = newsp;
890 } while (count++ < kstack_depth_to_print);
891}
892
893void dump_stack(void)
894{
895 show_stack(current, NULL);
896}
897EXPORT_SYMBOL(dump_stack);
cb2c9b27
AB		 898
899#ifdef CONFIG_PPC64
900void ppc64_runlatch_on(void)
901{
902 unsigned long ctrl;
903
904 if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) {
905 HMT_medium();
906
907 ctrl = mfspr(SPRN_CTRLF);
908 ctrl |= CTRL_RUNLATCH;
909 mtspr(SPRN_CTRLT, ctrl);
910
911 set_thread_flag(TIF_RUNLATCH);
912 }
913}
914
915void ppc64_runlatch_off(void)
916{
917 unsigned long ctrl;
918
919 if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) {
920 HMT_medium();
921
922 clear_thread_flag(TIF_RUNLATCH);
923
924 ctrl = mfspr(SPRN_CTRLF);
925 ctrl &= ~CTRL_RUNLATCH;
926 mtspr(SPRN_CTRLT, ctrl);
927 }
928}
929#endif
kernel source for telekom puls (alcatel/mediatek)