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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 | ||
14cf11af PM |
17 | #include <linux/errno.h> |
18 | #include <linux/sched.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/smp_lock.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/unistd.h> | |
25 | #include <linux/ptrace.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/user.h> | |
28 | #include <linux/elf.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/prctl.h> | |
31 | #include <linux/init_task.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/kallsyms.h> | |
34 | #include <linux/mqueue.h> | |
35 | #include <linux/hardirq.h> | |
06d67d54 | 36 | #include <linux/utsname.h> |
14cf11af PM |
37 | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/uaccess.h> | |
40 | #include <asm/system.h> | |
41 | #include <asm/io.h> | |
42 | #include <asm/processor.h> | |
43 | #include <asm/mmu.h> | |
44 | #include <asm/prom.h> | |
76032de8 | 45 | #include <asm/machdep.h> |
c6622f63 | 46 | #include <asm/time.h> |
a7f31841 | 47 | #include <asm/syscalls.h> |
06d67d54 PM |
48 | #ifdef CONFIG_PPC64 |
49 | #include <asm/firmware.h> | |
06d67d54 | 50 | #endif |
14cf11af PM |
51 | |
52 | extern unsigned long _get_SP(void); | |
53 | ||
54 | #ifndef CONFIG_SMP | |
55 | struct task_struct *last_task_used_math = NULL; | |
56 | struct task_struct *last_task_used_altivec = NULL; | |
57 | struct 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 | */ | |
64 | void 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 | ||
93 | void 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 | } | |
106 | EXPORT_SYMBOL(enable_kernel_fp); | |
107 | ||
108 | int 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 | |
120 | void 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 | } | |
133 | EXPORT_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 | */ | |
139 | void 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 | ||
153 | int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs) | |
154 | { | |
155 | flush_altivec_to_thread(current); | |
156 | memcpy(vrregs, ¤t->thread.vr[0], sizeof(*vrregs)); | |
157 | return 1; | |
158 | } | |
159 | #endif /* CONFIG_ALTIVEC */ | |
160 | ||
161 | #ifdef CONFIG_SPE | |
162 | ||
163 | void 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 | } | |
176 | EXPORT_SYMBOL(enable_kernel_spe); | |
177 | ||
178 | void 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 | ||
192 | int 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, ¤t->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 | 206 | void 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 |
224 | int 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 |
235 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
14cf11af | 236 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
06d67d54 | 237 | #endif |
14cf11af PM |
238 | |
239 | struct 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 = ¤t->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 |
342 | static 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 | ||
351 | static 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 | ||
af308377 SR |
365 | /* We use __get_user here *only* to avoid an OOPS on a |
366 | * bad address because the pc *should* only be a | |
367 | * kernel address. | |
368 | */ | |
369 | if (BAD_PC(pc) || __get_user(instr, (unsigned int __user *)pc)) { | |
06d67d54 PM |
370 | printk("XXXXXXXX "); |
371 | } else { | |
372 | if (regs->nip == pc) | |
373 | printk("<%08x> ", instr); | |
374 | else | |
375 | printk("%08x ", instr); | |
376 | } | |
377 | ||
378 | pc += sizeof(int); | |
379 | } | |
380 | ||
381 | printk("\n"); | |
382 | } | |
383 | ||
384 | static struct regbit { | |
385 | unsigned long bit; | |
386 | const char *name; | |
387 | } msr_bits[] = { | |
388 | {MSR_EE, "EE"}, | |
389 | {MSR_PR, "PR"}, | |
390 | {MSR_FP, "FP"}, | |
391 | {MSR_ME, "ME"}, | |
392 | {MSR_IR, "IR"}, | |
393 | {MSR_DR, "DR"}, | |
394 | {0, NULL} | |
395 | }; | |
396 | ||
397 | static void printbits(unsigned long val, struct regbit *bits) | |
398 | { | |
399 | const char *sep = ""; | |
400 | ||
401 | printk("<"); | |
402 | for (; bits->bit; ++bits) | |
403 | if (val & bits->bit) { | |
404 | printk("%s%s", sep, bits->name); | |
405 | sep = ","; | |
406 | } | |
407 | printk(">"); | |
408 | } | |
409 | ||
410 | #ifdef CONFIG_PPC64 | |
411 | #define REG "%016lX" | |
412 | #define REGS_PER_LINE 4 | |
413 | #define LAST_VOLATILE 13 | |
414 | #else | |
415 | #define REG "%08lX" | |
416 | #define REGS_PER_LINE 8 | |
417 | #define LAST_VOLATILE 12 | |
418 | #endif | |
419 | ||
14cf11af PM |
420 | void show_regs(struct pt_regs * regs) |
421 | { | |
422 | int i, trap; | |
423 | ||
06d67d54 PM |
424 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
425 | regs->nip, regs->link, regs->ctr); | |
426 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
427 | regs, regs->trap, print_tainted(), system_utsname.release); | |
428 | printk("MSR: "REG" ", regs->msr); | |
429 | printbits(regs->msr, msr_bits); | |
430 | printk(" CR: %08lX XER: %08lX\n", regs->ccr, regs->xer); | |
14cf11af PM |
431 | trap = TRAP(regs); |
432 | if (trap == 0x300 || trap == 0x600) | |
06d67d54 PM |
433 | printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr); |
434 | printk("TASK = %p[%d] '%s' THREAD: %p", | |
b5e2fc1c | 435 | current, current->pid, current->comm, task_thread_info(current)); |
14cf11af PM |
436 | |
437 | #ifdef CONFIG_SMP | |
438 | printk(" CPU: %d", smp_processor_id()); | |
439 | #endif /* CONFIG_SMP */ | |
440 | ||
441 | for (i = 0; i < 32; i++) { | |
06d67d54 | 442 | if ((i % REGS_PER_LINE) == 0) |
14cf11af | 443 | printk("\n" KERN_INFO "GPR%02d: ", i); |
06d67d54 PM |
444 | printk(REG " ", regs->gpr[i]); |
445 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
446 | break; |
447 | } | |
448 | printk("\n"); | |
449 | #ifdef CONFIG_KALLSYMS | |
450 | /* | |
451 | * Lookup NIP late so we have the best change of getting the | |
452 | * above info out without failing | |
453 | */ | |
06d67d54 | 454 | printk("NIP ["REG"] ", regs->nip); |
14cf11af | 455 | print_symbol("%s\n", regs->nip); |
06d67d54 | 456 | printk("LR ["REG"] ", regs->link); |
14cf11af PM |
457 | print_symbol("%s\n", regs->link); |
458 | #endif | |
459 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
460 | if (!user_mode(regs)) |
461 | show_instructions(regs); | |
14cf11af PM |
462 | } |
463 | ||
464 | void exit_thread(void) | |
465 | { | |
48abec07 | 466 | discard_lazy_cpu_state(); |
14cf11af PM |
467 | } |
468 | ||
469 | void flush_thread(void) | |
470 | { | |
06d67d54 PM |
471 | #ifdef CONFIG_PPC64 |
472 | struct thread_info *t = current_thread_info(); | |
473 | ||
474 | if (t->flags & _TIF_ABI_PENDING) | |
475 | t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT); | |
476 | #endif | |
06d67d54 | 477 | |
48abec07 | 478 | discard_lazy_cpu_state(); |
14cf11af PM |
479 | |
480 | #ifdef CONFIG_PPC64 /* for now */ | |
481 | if (current->thread.dabr) { | |
482 | current->thread.dabr = 0; | |
483 | set_dabr(0); | |
484 | } | |
485 | #endif | |
486 | } | |
487 | ||
488 | void | |
489 | release_thread(struct task_struct *t) | |
490 | { | |
491 | } | |
492 | ||
493 | /* | |
494 | * This gets called before we allocate a new thread and copy | |
495 | * the current task into it. | |
496 | */ | |
497 | void prepare_to_copy(struct task_struct *tsk) | |
498 | { | |
499 | flush_fp_to_thread(current); | |
500 | flush_altivec_to_thread(current); | |
501 | flush_spe_to_thread(current); | |
502 | } | |
503 | ||
504 | /* | |
505 | * Copy a thread.. | |
506 | */ | |
06d67d54 PM |
507 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, |
508 | unsigned long unused, struct task_struct *p, | |
509 | struct pt_regs *regs) | |
14cf11af PM |
510 | { |
511 | struct pt_regs *childregs, *kregs; | |
512 | extern void ret_from_fork(void); | |
0cec6fd1 | 513 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
514 | |
515 | CHECK_FULL_REGS(regs); | |
516 | /* Copy registers */ | |
517 | sp -= sizeof(struct pt_regs); | |
518 | childregs = (struct pt_regs *) sp; | |
519 | *childregs = *regs; | |
520 | if ((childregs->msr & MSR_PR) == 0) { | |
521 | /* for kernel thread, set `current' and stackptr in new task */ | |
522 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 523 | #ifdef CONFIG_PPC32 |
14cf11af | 524 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 525 | #else |
b5e2fc1c | 526 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 527 | #endif |
14cf11af PM |
528 | p->thread.regs = NULL; /* no user register state */ |
529 | } else { | |
530 | childregs->gpr[1] = usp; | |
531 | p->thread.regs = childregs; | |
06d67d54 PM |
532 | if (clone_flags & CLONE_SETTLS) { |
533 | #ifdef CONFIG_PPC64 | |
534 | if (!test_thread_flag(TIF_32BIT)) | |
535 | childregs->gpr[13] = childregs->gpr[6]; | |
536 | else | |
537 | #endif | |
538 | childregs->gpr[2] = childregs->gpr[6]; | |
539 | } | |
14cf11af PM |
540 | } |
541 | childregs->gpr[3] = 0; /* Result from fork() */ | |
542 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
543 | |
544 | /* | |
545 | * The way this works is that at some point in the future | |
546 | * some task will call _switch to switch to the new task. | |
547 | * That will pop off the stack frame created below and start | |
548 | * the new task running at ret_from_fork. The new task will | |
549 | * do some house keeping and then return from the fork or clone | |
550 | * system call, using the stack frame created above. | |
551 | */ | |
552 | sp -= sizeof(struct pt_regs); | |
553 | kregs = (struct pt_regs *) sp; | |
554 | sp -= STACK_FRAME_OVERHEAD; | |
555 | p->thread.ksp = sp; | |
14cf11af | 556 | |
06d67d54 PM |
557 | #ifdef CONFIG_PPC64 |
558 | if (cpu_has_feature(CPU_FTR_SLB)) { | |
559 | unsigned long sp_vsid = get_kernel_vsid(sp); | |
3c726f8d | 560 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 PM |
561 | |
562 | sp_vsid <<= SLB_VSID_SHIFT; | |
3c726f8d | 563 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
564 | p->thread.ksp_vsid = sp_vsid; |
565 | } | |
566 | ||
567 | /* | |
568 | * The PPC64 ABI makes use of a TOC to contain function | |
569 | * pointers. The function (ret_from_except) is actually a pointer | |
570 | * to the TOC entry. The first entry is a pointer to the actual | |
571 | * function. | |
572 | */ | |
573 | kregs->nip = *((unsigned long *)ret_from_fork); | |
574 | #else | |
575 | kregs->nip = (unsigned long)ret_from_fork; | |
14cf11af | 576 | p->thread.last_syscall = -1; |
06d67d54 | 577 | #endif |
14cf11af PM |
578 | |
579 | return 0; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Set up a thread for executing a new program | |
584 | */ | |
06d67d54 | 585 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 586 | { |
90eac727 ME |
587 | #ifdef CONFIG_PPC64 |
588 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
589 | #endif | |
590 | ||
14cf11af | 591 | set_fs(USER_DS); |
06d67d54 PM |
592 | |
593 | /* | |
594 | * If we exec out of a kernel thread then thread.regs will not be | |
595 | * set. Do it now. | |
596 | */ | |
597 | if (!current->thread.regs) { | |
0cec6fd1 AV |
598 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
599 | current->thread.regs = regs - 1; | |
06d67d54 PM |
600 | } |
601 | ||
14cf11af PM |
602 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
603 | regs->ctr = 0; | |
604 | regs->link = 0; | |
605 | regs->xer = 0; | |
606 | regs->ccr = 0; | |
14cf11af | 607 | regs->gpr[1] = sp; |
06d67d54 PM |
608 | |
609 | #ifdef CONFIG_PPC32 | |
610 | regs->mq = 0; | |
611 | regs->nip = start; | |
14cf11af | 612 | regs->msr = MSR_USER; |
06d67d54 | 613 | #else |
d4bf9a78 | 614 | if (!test_thread_flag(TIF_32BIT)) { |
90eac727 | 615 | unsigned long entry, toc; |
06d67d54 PM |
616 | |
617 | /* start is a relocated pointer to the function descriptor for | |
618 | * the elf _start routine. The first entry in the function | |
619 | * descriptor is the entry address of _start and the second | |
620 | * entry is the TOC value we need to use. | |
621 | */ | |
622 | __get_user(entry, (unsigned long __user *)start); | |
623 | __get_user(toc, (unsigned long __user *)start+1); | |
624 | ||
625 | /* Check whether the e_entry function descriptor entries | |
626 | * need to be relocated before we can use them. | |
627 | */ | |
628 | if (load_addr != 0) { | |
629 | entry += load_addr; | |
630 | toc += load_addr; | |
631 | } | |
632 | regs->nip = entry; | |
633 | regs->gpr[2] = toc; | |
634 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
635 | } else { |
636 | regs->nip = start; | |
637 | regs->gpr[2] = 0; | |
638 | regs->msr = MSR_USER32; | |
06d67d54 PM |
639 | } |
640 | #endif | |
641 | ||
48abec07 | 642 | discard_lazy_cpu_state(); |
14cf11af | 643 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 644 | current->thread.fpscr.val = 0; |
14cf11af PM |
645 | #ifdef CONFIG_ALTIVEC |
646 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
647 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 648 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
649 | current->thread.vrsave = 0; |
650 | current->thread.used_vr = 0; | |
651 | #endif /* CONFIG_ALTIVEC */ | |
652 | #ifdef CONFIG_SPE | |
653 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
654 | current->thread.acc = 0; | |
655 | current->thread.spefscr = 0; | |
656 | current->thread.used_spe = 0; | |
657 | #endif /* CONFIG_SPE */ | |
658 | } | |
659 | ||
660 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
661 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
662 | ||
663 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
664 | { | |
665 | struct pt_regs *regs = tsk->thread.regs; | |
666 | ||
667 | /* This is a bit hairy. If we are an SPE enabled processor | |
668 | * (have embedded fp) we store the IEEE exception enable flags in | |
669 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
670 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
671 | if (val & PR_FP_EXC_SW_ENABLE) { | |
672 | #ifdef CONFIG_SPE | |
673 | tsk->thread.fpexc_mode = val & | |
674 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
06d67d54 | 675 | return 0; |
14cf11af PM |
676 | #else |
677 | return -EINVAL; | |
678 | #endif | |
14cf11af | 679 | } |
06d67d54 PM |
680 | |
681 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
682 | * __pack_fe01 use do not overlap with bits used for | |
683 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
684 | * on CONFIG_SPE implementations are reserved so writing to | |
685 | * them does not change anything */ | |
686 | if (val > PR_FP_EXC_PRECISE) | |
687 | return -EINVAL; | |
688 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
689 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
690 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
691 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
692 | return 0; |
693 | } | |
694 | ||
695 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
696 | { | |
697 | unsigned int val; | |
698 | ||
699 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
700 | #ifdef CONFIG_SPE | |
701 | val = tsk->thread.fpexc_mode; | |
702 | #else | |
703 | return -EINVAL; | |
704 | #endif | |
705 | else | |
706 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
707 | return put_user(val, (unsigned int __user *) adr); | |
708 | } | |
709 | ||
fab5db97 PM |
710 | int set_endian(struct task_struct *tsk, unsigned int val) |
711 | { | |
712 | struct pt_regs *regs = tsk->thread.regs; | |
713 | ||
714 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
715 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
716 | return -EINVAL; | |
717 | ||
718 | if (regs == NULL) | |
719 | return -EINVAL; | |
720 | ||
721 | if (val == PR_ENDIAN_BIG) | |
722 | regs->msr &= ~MSR_LE; | |
723 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
724 | regs->msr |= MSR_LE; | |
725 | else | |
726 | return -EINVAL; | |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
731 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
732 | { | |
733 | struct pt_regs *regs = tsk->thread.regs; | |
734 | unsigned int val; | |
735 | ||
736 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
737 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
738 | return -EINVAL; | |
739 | ||
740 | if (regs == NULL) | |
741 | return -EINVAL; | |
742 | ||
743 | if (regs->msr & MSR_LE) { | |
744 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
745 | val = PR_ENDIAN_LITTLE; | |
746 | else | |
747 | val = PR_ENDIAN_PPC_LITTLE; | |
748 | } else | |
749 | val = PR_ENDIAN_BIG; | |
750 | ||
751 | return put_user(val, (unsigned int __user *)adr); | |
752 | } | |
753 | ||
e9370ae1 PM |
754 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
755 | { | |
756 | tsk->thread.align_ctl = val; | |
757 | return 0; | |
758 | } | |
759 | ||
760 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
761 | { | |
762 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
763 | } | |
764 | ||
06d67d54 PM |
765 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
766 | ||
14cf11af PM |
767 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
768 | int __user *parent_tidp, void __user *child_threadptr, | |
769 | int __user *child_tidp, int p6, | |
770 | struct pt_regs *regs) | |
771 | { | |
772 | CHECK_FULL_REGS(regs); | |
773 | if (usp == 0) | |
774 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 PM |
775 | #ifdef CONFIG_PPC64 |
776 | if (test_thread_flag(TIF_32BIT)) { | |
777 | parent_tidp = TRUNC_PTR(parent_tidp); | |
778 | child_tidp = TRUNC_PTR(child_tidp); | |
779 | } | |
780 | #endif | |
14cf11af PM |
781 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
782 | } | |
783 | ||
784 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
785 | unsigned long p4, unsigned long p5, unsigned long p6, | |
786 | struct pt_regs *regs) | |
787 | { | |
788 | CHECK_FULL_REGS(regs); | |
789 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
790 | } | |
791 | ||
792 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
793 | unsigned long p4, unsigned long p5, unsigned long p6, | |
794 | struct pt_regs *regs) | |
795 | { | |
796 | CHECK_FULL_REGS(regs); | |
797 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
798 | regs, 0, NULL, NULL); | |
799 | } | |
800 | ||
801 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
802 | unsigned long a3, unsigned long a4, unsigned long a5, | |
803 | struct pt_regs *regs) | |
804 | { | |
805 | int error; | |
06d67d54 | 806 | char *filename; |
14cf11af PM |
807 | |
808 | filename = getname((char __user *) a0); | |
809 | error = PTR_ERR(filename); | |
810 | if (IS_ERR(filename)) | |
811 | goto out; | |
812 | flush_fp_to_thread(current); | |
813 | flush_altivec_to_thread(current); | |
814 | flush_spe_to_thread(current); | |
20c8c210 PM |
815 | error = do_execve(filename, (char __user * __user *) a1, |
816 | (char __user * __user *) a2, regs); | |
14cf11af PM |
817 | if (error == 0) { |
818 | task_lock(current); | |
819 | current->ptrace &= ~PT_DTRACE; | |
820 | task_unlock(current); | |
821 | } | |
822 | putname(filename); | |
823 | out: | |
824 | return error; | |
825 | } | |
826 | ||
2f25194d | 827 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
828 | unsigned long nbytes) |
829 | { | |
0cec6fd1 | 830 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
831 | |
832 | if (sp >= stack_page + sizeof(struct thread_struct) | |
833 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
834 | return 1; | |
835 | ||
836 | #ifdef CONFIG_IRQSTACKS | |
837 | stack_page = (unsigned long) hardirq_ctx[task_cpu(p)]; | |
838 | if (sp >= stack_page + sizeof(struct thread_struct) | |
839 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
840 | return 1; | |
841 | ||
842 | stack_page = (unsigned long) softirq_ctx[task_cpu(p)]; | |
843 | if (sp >= stack_page + sizeof(struct thread_struct) | |
844 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
845 | return 1; | |
846 | #endif | |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
06d67d54 PM |
851 | #ifdef CONFIG_PPC64 |
852 | #define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */ | |
853 | #define FRAME_LR_SAVE 2 | |
854 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288) | |
855 | #define REGS_MARKER 0x7265677368657265ul | |
856 | #define FRAME_MARKER 12 | |
857 | #else | |
858 | #define MIN_STACK_FRAME 16 | |
859 | #define FRAME_LR_SAVE 1 | |
860 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) | |
861 | #define REGS_MARKER 0x72656773ul | |
862 | #define FRAME_MARKER 2 | |
14cf11af | 863 | #endif |
14cf11af | 864 | |
2f25194d AB |
865 | EXPORT_SYMBOL(validate_sp); |
866 | ||
14cf11af PM |
867 | unsigned long get_wchan(struct task_struct *p) |
868 | { | |
869 | unsigned long ip, sp; | |
870 | int count = 0; | |
871 | ||
872 | if (!p || p == current || p->state == TASK_RUNNING) | |
873 | return 0; | |
874 | ||
875 | sp = p->thread.ksp; | |
06d67d54 | 876 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
877 | return 0; |
878 | ||
879 | do { | |
880 | sp = *(unsigned long *)sp; | |
06d67d54 | 881 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
882 | return 0; |
883 | if (count > 0) { | |
06d67d54 | 884 | ip = ((unsigned long *)sp)[FRAME_LR_SAVE]; |
14cf11af PM |
885 | if (!in_sched_functions(ip)) |
886 | return ip; | |
887 | } | |
888 | } while (count++ < 16); | |
889 | return 0; | |
890 | } | |
06d67d54 PM |
891 | |
892 | static int kstack_depth_to_print = 64; | |
893 | ||
894 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
895 | { | |
896 | unsigned long sp, ip, lr, newsp; | |
897 | int count = 0; | |
898 | int firstframe = 1; | |
899 | ||
900 | sp = (unsigned long) stack; | |
901 | if (tsk == NULL) | |
902 | tsk = current; | |
903 | if (sp == 0) { | |
904 | if (tsk == current) | |
905 | asm("mr %0,1" : "=r" (sp)); | |
906 | else | |
907 | sp = tsk->thread.ksp; | |
908 | } | |
909 | ||
910 | lr = 0; | |
911 | printk("Call Trace:\n"); | |
912 | do { | |
913 | if (!validate_sp(sp, tsk, MIN_STACK_FRAME)) | |
914 | return; | |
915 | ||
916 | stack = (unsigned long *) sp; | |
917 | newsp = stack[0]; | |
918 | ip = stack[FRAME_LR_SAVE]; | |
919 | if (!firstframe || ip != lr) { | |
920 | printk("["REG"] ["REG"] ", sp, ip); | |
921 | print_symbol("%s", ip); | |
922 | if (firstframe) | |
923 | printk(" (unreliable)"); | |
924 | printk("\n"); | |
925 | } | |
926 | firstframe = 0; | |
927 | ||
928 | /* | |
929 | * See if this is an exception frame. | |
930 | * We look for the "regshere" marker in the current frame. | |
931 | */ | |
932 | if (validate_sp(sp, tsk, INT_FRAME_SIZE) | |
933 | && stack[FRAME_MARKER] == REGS_MARKER) { | |
934 | struct pt_regs *regs = (struct pt_regs *) | |
935 | (sp + STACK_FRAME_OVERHEAD); | |
936 | printk("--- Exception: %lx", regs->trap); | |
937 | print_symbol(" at %s\n", regs->nip); | |
938 | lr = regs->link; | |
939 | print_symbol(" LR = %s\n", lr); | |
940 | firstframe = 1; | |
941 | } | |
942 | ||
943 | sp = newsp; | |
944 | } while (count++ < kstack_depth_to_print); | |
945 | } | |
946 | ||
947 | void dump_stack(void) | |
948 | { | |
949 | show_stack(current, NULL); | |
950 | } | |
951 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
952 | |
953 | #ifdef CONFIG_PPC64 | |
954 | void ppc64_runlatch_on(void) | |
955 | { | |
956 | unsigned long ctrl; | |
957 | ||
958 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
959 | HMT_medium(); | |
960 | ||
961 | ctrl = mfspr(SPRN_CTRLF); | |
962 | ctrl |= CTRL_RUNLATCH; | |
963 | mtspr(SPRN_CTRLT, ctrl); | |
964 | ||
965 | set_thread_flag(TIF_RUNLATCH); | |
966 | } | |
967 | } | |
968 | ||
969 | void ppc64_runlatch_off(void) | |
970 | { | |
971 | unsigned long ctrl; | |
972 | ||
973 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { | |
974 | HMT_medium(); | |
975 | ||
976 | clear_thread_flag(TIF_RUNLATCH); | |
977 | ||
978 | ctrl = mfspr(SPRN_CTRLF); | |
979 | ctrl &= ~CTRL_RUNLATCH; | |
980 | mtspr(SPRN_CTRLT, ctrl); | |
981 | } | |
982 | } | |
983 | #endif |