Commit | Line | Data |
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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 | |
53 | extern unsigned long _get_SP(void); | |
54 | ||
55 | #ifndef CONFIG_SMP | |
56 | struct task_struct *last_task_used_math = NULL; | |
57 | struct task_struct *last_task_used_altivec = NULL; | |
58 | struct 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 | */ | |
65 | void 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 | ||
94 | void 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 | } | |
107 | EXPORT_SYMBOL(enable_kernel_fp); | |
108 | ||
109 | int 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 | |
121 | void 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 | } | |
134 | EXPORT_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 | */ | |
140 | void 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 | ||
154 | int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs) | |
155 | { | |
156 | flush_altivec_to_thread(current); | |
157 | memcpy(vrregs, ¤t->thread.vr[0], sizeof(*vrregs)); | |
158 | return 1; | |
159 | } | |
160 | #endif /* CONFIG_ALTIVEC */ | |
161 | ||
162 | #ifdef CONFIG_SPE | |
163 | ||
164 | void 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 | } | |
177 | EXPORT_SYMBOL(enable_kernel_spe); | |
178 | ||
179 | void 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 | ||
193 | int 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, ¤t->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 | 207 | void 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 |
225 | int 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 |
236 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
14cf11af | 237 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
06d67d54 | 238 | #endif |
14cf11af PM |
239 | |
240 | struct 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 = ¤t->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 |
343 | static 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 | ||
352 | static 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 | ||
385 | static 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 | ||
398 | static 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 |
421 | void 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 | ||
465 | void exit_thread(void) | |
466 | { | |
48abec07 | 467 | discard_lazy_cpu_state(); |
14cf11af PM |
468 | } |
469 | ||
470 | void 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 | ||
489 | void | |
490 | release_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 | */ | |
498 | void 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 |
508 | int 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 | 586 | void 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(¤t->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 | ||
664 | int 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 | ||
696 | int 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 | ||
fab5db97 PM |
711 | int set_endian(struct task_struct *tsk, unsigned int val) |
712 | { | |
713 | struct pt_regs *regs = tsk->thread.regs; | |
714 | ||
715 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
716 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
717 | return -EINVAL; | |
718 | ||
719 | if (regs == NULL) | |
720 | return -EINVAL; | |
721 | ||
722 | if (val == PR_ENDIAN_BIG) | |
723 | regs->msr &= ~MSR_LE; | |
724 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
725 | regs->msr |= MSR_LE; | |
726 | else | |
727 | return -EINVAL; | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
732 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
733 | { | |
734 | struct pt_regs *regs = tsk->thread.regs; | |
735 | unsigned int val; | |
736 | ||
737 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
738 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
739 | return -EINVAL; | |
740 | ||
741 | if (regs == NULL) | |
742 | return -EINVAL; | |
743 | ||
744 | if (regs->msr & MSR_LE) { | |
745 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
746 | val = PR_ENDIAN_LITTLE; | |
747 | else | |
748 | val = PR_ENDIAN_PPC_LITTLE; | |
749 | } else | |
750 | val = PR_ENDIAN_BIG; | |
751 | ||
752 | return put_user(val, (unsigned int __user *)adr); | |
753 | } | |
754 | ||
e9370ae1 PM |
755 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
756 | { | |
757 | tsk->thread.align_ctl = val; | |
758 | return 0; | |
759 | } | |
760 | ||
761 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
762 | { | |
763 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
764 | } | |
765 | ||
06d67d54 PM |
766 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
767 | ||
14cf11af PM |
768 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
769 | int __user *parent_tidp, void __user *child_threadptr, | |
770 | int __user *child_tidp, int p6, | |
771 | struct pt_regs *regs) | |
772 | { | |
773 | CHECK_FULL_REGS(regs); | |
774 | if (usp == 0) | |
775 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 PM |
776 | #ifdef CONFIG_PPC64 |
777 | if (test_thread_flag(TIF_32BIT)) { | |
778 | parent_tidp = TRUNC_PTR(parent_tidp); | |
779 | child_tidp = TRUNC_PTR(child_tidp); | |
780 | } | |
781 | #endif | |
14cf11af PM |
782 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
783 | } | |
784 | ||
785 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
786 | unsigned long p4, unsigned long p5, unsigned long p6, | |
787 | struct pt_regs *regs) | |
788 | { | |
789 | CHECK_FULL_REGS(regs); | |
790 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
791 | } | |
792 | ||
793 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
794 | unsigned long p4, unsigned long p5, unsigned long p6, | |
795 | struct pt_regs *regs) | |
796 | { | |
797 | CHECK_FULL_REGS(regs); | |
798 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
799 | regs, 0, NULL, NULL); | |
800 | } | |
801 | ||
802 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
803 | unsigned long a3, unsigned long a4, unsigned long a5, | |
804 | struct pt_regs *regs) | |
805 | { | |
806 | int error; | |
06d67d54 | 807 | char *filename; |
14cf11af PM |
808 | |
809 | filename = getname((char __user *) a0); | |
810 | error = PTR_ERR(filename); | |
811 | if (IS_ERR(filename)) | |
812 | goto out; | |
813 | flush_fp_to_thread(current); | |
814 | flush_altivec_to_thread(current); | |
815 | flush_spe_to_thread(current); | |
20c8c210 PM |
816 | error = do_execve(filename, (char __user * __user *) a1, |
817 | (char __user * __user *) a2, regs); | |
14cf11af PM |
818 | if (error == 0) { |
819 | task_lock(current); | |
820 | current->ptrace &= ~PT_DTRACE; | |
821 | task_unlock(current); | |
822 | } | |
823 | putname(filename); | |
824 | out: | |
825 | return error; | |
826 | } | |
827 | ||
2f25194d | 828 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
829 | unsigned long nbytes) |
830 | { | |
0cec6fd1 | 831 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
832 | |
833 | if (sp >= stack_page + sizeof(struct thread_struct) | |
834 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
835 | return 1; | |
836 | ||
837 | #ifdef CONFIG_IRQSTACKS | |
838 | stack_page = (unsigned long) hardirq_ctx[task_cpu(p)]; | |
839 | if (sp >= stack_page + sizeof(struct thread_struct) | |
840 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
841 | return 1; | |
842 | ||
843 | stack_page = (unsigned long) softirq_ctx[task_cpu(p)]; | |
844 | if (sp >= stack_page + sizeof(struct thread_struct) | |
845 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
846 | return 1; | |
847 | #endif | |
848 | ||
849 | return 0; | |
850 | } | |
851 | ||
06d67d54 PM |
852 | #ifdef CONFIG_PPC64 |
853 | #define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */ | |
854 | #define FRAME_LR_SAVE 2 | |
855 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288) | |
856 | #define REGS_MARKER 0x7265677368657265ul | |
857 | #define FRAME_MARKER 12 | |
858 | #else | |
859 | #define MIN_STACK_FRAME 16 | |
860 | #define FRAME_LR_SAVE 1 | |
861 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) | |
862 | #define REGS_MARKER 0x72656773ul | |
863 | #define FRAME_MARKER 2 | |
14cf11af | 864 | #endif |
14cf11af | 865 | |
2f25194d AB |
866 | EXPORT_SYMBOL(validate_sp); |
867 | ||
14cf11af PM |
868 | unsigned long get_wchan(struct task_struct *p) |
869 | { | |
870 | unsigned long ip, sp; | |
871 | int count = 0; | |
872 | ||
873 | if (!p || p == current || p->state == TASK_RUNNING) | |
874 | return 0; | |
875 | ||
876 | sp = p->thread.ksp; | |
06d67d54 | 877 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
878 | return 0; |
879 | ||
880 | do { | |
881 | sp = *(unsigned long *)sp; | |
06d67d54 | 882 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
883 | return 0; |
884 | if (count > 0) { | |
06d67d54 | 885 | ip = ((unsigned long *)sp)[FRAME_LR_SAVE]; |
14cf11af PM |
886 | if (!in_sched_functions(ip)) |
887 | return ip; | |
888 | } | |
889 | } while (count++ < 16); | |
890 | return 0; | |
891 | } | |
06d67d54 PM |
892 | |
893 | static int kstack_depth_to_print = 64; | |
894 | ||
895 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
896 | { | |
897 | unsigned long sp, ip, lr, newsp; | |
898 | int count = 0; | |
899 | int firstframe = 1; | |
900 | ||
901 | sp = (unsigned long) stack; | |
902 | if (tsk == NULL) | |
903 | tsk = current; | |
904 | if (sp == 0) { | |
905 | if (tsk == current) | |
906 | asm("mr %0,1" : "=r" (sp)); | |
907 | else | |
908 | sp = tsk->thread.ksp; | |
909 | } | |
910 | ||
911 | lr = 0; | |
912 | printk("Call Trace:\n"); | |
913 | do { | |
914 | if (!validate_sp(sp, tsk, MIN_STACK_FRAME)) | |
915 | return; | |
916 | ||
917 | stack = (unsigned long *) sp; | |
918 | newsp = stack[0]; | |
919 | ip = stack[FRAME_LR_SAVE]; | |
920 | if (!firstframe || ip != lr) { | |
921 | printk("["REG"] ["REG"] ", sp, ip); | |
922 | print_symbol("%s", ip); | |
923 | if (firstframe) | |
924 | printk(" (unreliable)"); | |
925 | printk("\n"); | |
926 | } | |
927 | firstframe = 0; | |
928 | ||
929 | /* | |
930 | * See if this is an exception frame. | |
931 | * We look for the "regshere" marker in the current frame. | |
932 | */ | |
933 | if (validate_sp(sp, tsk, INT_FRAME_SIZE) | |
934 | && stack[FRAME_MARKER] == REGS_MARKER) { | |
935 | struct pt_regs *regs = (struct pt_regs *) | |
936 | (sp + STACK_FRAME_OVERHEAD); | |
937 | printk("--- Exception: %lx", regs->trap); | |
938 | print_symbol(" at %s\n", regs->nip); | |
939 | lr = regs->link; | |
940 | print_symbol(" LR = %s\n", lr); | |
941 | firstframe = 1; | |
942 | } | |
943 | ||
944 | sp = newsp; | |
945 | } while (count++ < kstack_depth_to_print); | |
946 | } | |
947 | ||
948 | void dump_stack(void) | |
949 | { | |
950 | show_stack(current, NULL); | |
951 | } | |
952 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
953 | |
954 | #ifdef CONFIG_PPC64 | |
955 | void ppc64_runlatch_on(void) | |
956 | { | |
957 | unsigned long ctrl; | |
958 | ||
959 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
960 | HMT_medium(); | |
961 | ||
962 | ctrl = mfspr(SPRN_CTRLF); | |
963 | ctrl |= CTRL_RUNLATCH; | |
964 | mtspr(SPRN_CTRLT, ctrl); | |
965 | ||
966 | set_thread_flag(TIF_RUNLATCH); | |
967 | } | |
968 | } | |
969 | ||
970 | void ppc64_runlatch_off(void) | |
971 | { | |
972 | unsigned long ctrl; | |
973 | ||
974 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { | |
975 | HMT_medium(); | |
976 | ||
977 | clear_thread_flag(TIF_RUNLATCH); | |
978 | ||
979 | ctrl = mfspr(SPRN_CTRLF); | |
980 | ctrl &= ~CTRL_RUNLATCH; | |
981 | mtspr(SPRN_CTRLT, ctrl); | |
982 | } | |
983 | } | |
984 | #endif |