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 | ||
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> | |
14cf11af PM |
22 | #include <linux/stddef.h> |
23 | #include <linux/unistd.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/user.h> | |
27 | #include <linux/elf.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/prctl.h> | |
30 | #include <linux/init_task.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/kallsyms.h> | |
33 | #include <linux/mqueue.h> | |
34 | #include <linux/hardirq.h> | |
06d67d54 | 35 | #include <linux/utsname.h> |
14cf11af PM |
36 | |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/uaccess.h> | |
39 | #include <asm/system.h> | |
40 | #include <asm/io.h> | |
41 | #include <asm/processor.h> | |
42 | #include <asm/mmu.h> | |
43 | #include <asm/prom.h> | |
76032de8 | 44 | #include <asm/machdep.h> |
c6622f63 | 45 | #include <asm/time.h> |
a7f31841 | 46 | #include <asm/syscalls.h> |
06d67d54 PM |
47 | #ifdef CONFIG_PPC64 |
48 | #include <asm/firmware.h> | |
06d67d54 | 49 | #endif |
14cf11af PM |
50 | |
51 | extern unsigned long _get_SP(void); | |
52 | ||
53 | #ifndef CONFIG_SMP | |
54 | struct task_struct *last_task_used_math = NULL; | |
55 | struct task_struct *last_task_used_altivec = NULL; | |
56 | struct task_struct *last_task_used_spe = NULL; | |
57 | #endif | |
58 | ||
14cf11af PM |
59 | /* |
60 | * Make sure the floating-point register state in the | |
61 | * the thread_struct is up to date for task tsk. | |
62 | */ | |
63 | void flush_fp_to_thread(struct task_struct *tsk) | |
64 | { | |
65 | if (tsk->thread.regs) { | |
66 | /* | |
67 | * We need to disable preemption here because if we didn't, | |
68 | * another process could get scheduled after the regs->msr | |
69 | * test but before we have finished saving the FP registers | |
70 | * to the thread_struct. That process could take over the | |
71 | * FPU, and then when we get scheduled again we would store | |
72 | * bogus values for the remaining FP registers. | |
73 | */ | |
74 | preempt_disable(); | |
75 | if (tsk->thread.regs->msr & MSR_FP) { | |
76 | #ifdef CONFIG_SMP | |
77 | /* | |
78 | * This should only ever be called for current or | |
79 | * for a stopped child process. Since we save away | |
80 | * the FP register state on context switch on SMP, | |
81 | * there is something wrong if a stopped child appears | |
82 | * to still have its FP state in the CPU registers. | |
83 | */ | |
84 | BUG_ON(tsk != current); | |
85 | #endif | |
86 | giveup_fpu(current); | |
87 | } | |
88 | preempt_enable(); | |
89 | } | |
90 | } | |
91 | ||
92 | void enable_kernel_fp(void) | |
93 | { | |
94 | WARN_ON(preemptible()); | |
95 | ||
96 | #ifdef CONFIG_SMP | |
97 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) | |
98 | giveup_fpu(current); | |
99 | else | |
100 | giveup_fpu(NULL); /* just enables FP for kernel */ | |
101 | #else | |
102 | giveup_fpu(last_task_used_math); | |
103 | #endif /* CONFIG_SMP */ | |
104 | } | |
105 | EXPORT_SYMBOL(enable_kernel_fp); | |
106 | ||
107 | int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) | |
108 | { | |
109 | if (!tsk->thread.regs) | |
110 | return 0; | |
111 | flush_fp_to_thread(current); | |
112 | ||
113 | memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs)); | |
114 | ||
115 | return 1; | |
116 | } | |
117 | ||
118 | #ifdef CONFIG_ALTIVEC | |
119 | void enable_kernel_altivec(void) | |
120 | { | |
121 | WARN_ON(preemptible()); | |
122 | ||
123 | #ifdef CONFIG_SMP | |
124 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) | |
125 | giveup_altivec(current); | |
126 | else | |
127 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ | |
128 | #else | |
129 | giveup_altivec(last_task_used_altivec); | |
130 | #endif /* CONFIG_SMP */ | |
131 | } | |
132 | EXPORT_SYMBOL(enable_kernel_altivec); | |
133 | ||
134 | /* | |
135 | * Make sure the VMX/Altivec register state in the | |
136 | * the thread_struct is up to date for task tsk. | |
137 | */ | |
138 | void flush_altivec_to_thread(struct task_struct *tsk) | |
139 | { | |
140 | if (tsk->thread.regs) { | |
141 | preempt_disable(); | |
142 | if (tsk->thread.regs->msr & MSR_VEC) { | |
143 | #ifdef CONFIG_SMP | |
144 | BUG_ON(tsk != current); | |
145 | #endif | |
146 | giveup_altivec(current); | |
147 | } | |
148 | preempt_enable(); | |
149 | } | |
150 | } | |
151 | ||
152 | int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs) | |
153 | { | |
154 | flush_altivec_to_thread(current); | |
155 | memcpy(vrregs, ¤t->thread.vr[0], sizeof(*vrregs)); | |
156 | return 1; | |
157 | } | |
158 | #endif /* CONFIG_ALTIVEC */ | |
159 | ||
160 | #ifdef CONFIG_SPE | |
161 | ||
162 | void enable_kernel_spe(void) | |
163 | { | |
164 | WARN_ON(preemptible()); | |
165 | ||
166 | #ifdef CONFIG_SMP | |
167 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) | |
168 | giveup_spe(current); | |
169 | else | |
170 | giveup_spe(NULL); /* just enable SPE for kernel - force */ | |
171 | #else | |
172 | giveup_spe(last_task_used_spe); | |
173 | #endif /* __SMP __ */ | |
174 | } | |
175 | EXPORT_SYMBOL(enable_kernel_spe); | |
176 | ||
177 | void flush_spe_to_thread(struct task_struct *tsk) | |
178 | { | |
179 | if (tsk->thread.regs) { | |
180 | preempt_disable(); | |
181 | if (tsk->thread.regs->msr & MSR_SPE) { | |
182 | #ifdef CONFIG_SMP | |
183 | BUG_ON(tsk != current); | |
184 | #endif | |
185 | giveup_spe(current); | |
186 | } | |
187 | preempt_enable(); | |
188 | } | |
189 | } | |
190 | ||
191 | int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs) | |
192 | { | |
193 | flush_spe_to_thread(current); | |
194 | /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */ | |
195 | memcpy(evrregs, ¤t->thread.evr[0], sizeof(u32) * 35); | |
196 | return 1; | |
197 | } | |
198 | #endif /* CONFIG_SPE */ | |
199 | ||
5388fb10 | 200 | #ifndef CONFIG_SMP |
48abec07 PM |
201 | /* |
202 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), | |
203 | * and the current task has some state, discard it. | |
204 | */ | |
5388fb10 | 205 | void discard_lazy_cpu_state(void) |
48abec07 | 206 | { |
48abec07 PM |
207 | preempt_disable(); |
208 | if (last_task_used_math == current) | |
209 | last_task_used_math = NULL; | |
210 | #ifdef CONFIG_ALTIVEC | |
211 | if (last_task_used_altivec == current) | |
212 | last_task_used_altivec = NULL; | |
213 | #endif /* CONFIG_ALTIVEC */ | |
214 | #ifdef CONFIG_SPE | |
215 | if (last_task_used_spe == current) | |
216 | last_task_used_spe = NULL; | |
217 | #endif | |
218 | preempt_enable(); | |
48abec07 | 219 | } |
5388fb10 | 220 | #endif /* CONFIG_SMP */ |
48abec07 | 221 | |
624cee31 | 222 | #ifdef CONFIG_PPC_MERGE /* XXX for now */ |
14cf11af PM |
223 | int set_dabr(unsigned long dabr) |
224 | { | |
cab0af98 ME |
225 | if (ppc_md.set_dabr) |
226 | return ppc_md.set_dabr(dabr); | |
14cf11af | 227 | |
cab0af98 ME |
228 | mtspr(SPRN_DABR, dabr); |
229 | return 0; | |
14cf11af | 230 | } |
624cee31 | 231 | #endif |
14cf11af | 232 | |
06d67d54 PM |
233 | #ifdef CONFIG_PPC64 |
234 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
14cf11af | 235 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
06d67d54 | 236 | #endif |
14cf11af PM |
237 | |
238 | struct task_struct *__switch_to(struct task_struct *prev, | |
239 | struct task_struct *new) | |
240 | { | |
241 | struct thread_struct *new_thread, *old_thread; | |
242 | unsigned long flags; | |
243 | struct task_struct *last; | |
244 | ||
245 | #ifdef CONFIG_SMP | |
246 | /* avoid complexity of lazy save/restore of fpu | |
247 | * by just saving it every time we switch out if | |
248 | * this task used the fpu during the last quantum. | |
249 | * | |
250 | * If it tries to use the fpu again, it'll trap and | |
251 | * reload its fp regs. So we don't have to do a restore | |
252 | * every switch, just a save. | |
253 | * -- Cort | |
254 | */ | |
255 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) | |
256 | giveup_fpu(prev); | |
257 | #ifdef CONFIG_ALTIVEC | |
258 | /* | |
259 | * If the previous thread used altivec in the last quantum | |
260 | * (thus changing altivec regs) then save them. | |
261 | * We used to check the VRSAVE register but not all apps | |
262 | * set it, so we don't rely on it now (and in fact we need | |
263 | * to save & restore VSCR even if VRSAVE == 0). -- paulus | |
264 | * | |
265 | * On SMP we always save/restore altivec regs just to avoid the | |
266 | * complexity of changing processors. | |
267 | * -- Cort | |
268 | */ | |
269 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) | |
270 | giveup_altivec(prev); | |
14cf11af PM |
271 | #endif /* CONFIG_ALTIVEC */ |
272 | #ifdef CONFIG_SPE | |
273 | /* | |
274 | * If the previous thread used spe in the last quantum | |
275 | * (thus changing spe regs) then save them. | |
276 | * | |
277 | * On SMP we always save/restore spe regs just to avoid the | |
278 | * complexity of changing processors. | |
279 | */ | |
280 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) | |
281 | giveup_spe(prev); | |
c0c0d996 PM |
282 | #endif /* CONFIG_SPE */ |
283 | ||
284 | #else /* CONFIG_SMP */ | |
285 | #ifdef CONFIG_ALTIVEC | |
286 | /* Avoid the trap. On smp this this never happens since | |
287 | * we don't set last_task_used_altivec -- Cort | |
288 | */ | |
289 | if (new->thread.regs && last_task_used_altivec == new) | |
290 | new->thread.regs->msr |= MSR_VEC; | |
291 | #endif /* CONFIG_ALTIVEC */ | |
292 | #ifdef CONFIG_SPE | |
14cf11af PM |
293 | /* Avoid the trap. On smp this this never happens since |
294 | * we don't set last_task_used_spe | |
295 | */ | |
296 | if (new->thread.regs && last_task_used_spe == new) | |
297 | new->thread.regs->msr |= MSR_SPE; | |
298 | #endif /* CONFIG_SPE */ | |
c0c0d996 | 299 | |
14cf11af PM |
300 | #endif /* CONFIG_SMP */ |
301 | ||
302 | #ifdef CONFIG_PPC64 /* for now */ | |
303 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) { | |
304 | set_dabr(new->thread.dabr); | |
305 | __get_cpu_var(current_dabr) = new->thread.dabr; | |
306 | } | |
a741e679 | 307 | #endif /* CONFIG_PPC64 */ |
14cf11af PM |
308 | |
309 | new_thread = &new->thread; | |
310 | old_thread = ¤t->thread; | |
06d67d54 PM |
311 | |
312 | #ifdef CONFIG_PPC64 | |
313 | /* | |
314 | * Collect processor utilization data per process | |
315 | */ | |
316 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
317 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); | |
318 | long unsigned start_tb, current_tb; | |
319 | start_tb = old_thread->start_tb; | |
320 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
321 | old_thread->accum_tb += (current_tb - start_tb); | |
322 | new_thread->start_tb = current_tb; | |
323 | } | |
324 | #endif | |
325 | ||
14cf11af | 326 | local_irq_save(flags); |
c6622f63 PM |
327 | |
328 | account_system_vtime(current); | |
329 | account_process_vtime(current); | |
330 | calculate_steal_time(); | |
331 | ||
14cf11af PM |
332 | last = _switch(old_thread, new_thread); |
333 | ||
334 | local_irq_restore(flags); | |
335 | ||
336 | return last; | |
337 | } | |
338 | ||
06d67d54 PM |
339 | static int instructions_to_print = 16; |
340 | ||
06d67d54 PM |
341 | static void show_instructions(struct pt_regs *regs) |
342 | { | |
343 | int i; | |
344 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
345 | sizeof(int)); | |
346 | ||
347 | printk("Instruction dump:"); | |
348 | ||
349 | for (i = 0; i < instructions_to_print; i++) { | |
350 | int instr; | |
351 | ||
352 | if (!(i % 8)) | |
353 | printk("\n"); | |
354 | ||
af308377 SR |
355 | /* We use __get_user here *only* to avoid an OOPS on a |
356 | * bad address because the pc *should* only be a | |
357 | * kernel address. | |
358 | */ | |
00ae36de AB |
359 | if (!__kernel_text_address(pc) || |
360 | __get_user(instr, (unsigned int __user *)pc)) { | |
06d67d54 PM |
361 | printk("XXXXXXXX "); |
362 | } else { | |
363 | if (regs->nip == pc) | |
364 | printk("<%08x> ", instr); | |
365 | else | |
366 | printk("%08x ", instr); | |
367 | } | |
368 | ||
369 | pc += sizeof(int); | |
370 | } | |
371 | ||
372 | printk("\n"); | |
373 | } | |
374 | ||
375 | static struct regbit { | |
376 | unsigned long bit; | |
377 | const char *name; | |
378 | } msr_bits[] = { | |
379 | {MSR_EE, "EE"}, | |
380 | {MSR_PR, "PR"}, | |
381 | {MSR_FP, "FP"}, | |
382 | {MSR_ME, "ME"}, | |
383 | {MSR_IR, "IR"}, | |
384 | {MSR_DR, "DR"}, | |
385 | {0, NULL} | |
386 | }; | |
387 | ||
388 | static void printbits(unsigned long val, struct regbit *bits) | |
389 | { | |
390 | const char *sep = ""; | |
391 | ||
392 | printk("<"); | |
393 | for (; bits->bit; ++bits) | |
394 | if (val & bits->bit) { | |
395 | printk("%s%s", sep, bits->name); | |
396 | sep = ","; | |
397 | } | |
398 | printk(">"); | |
399 | } | |
400 | ||
401 | #ifdef CONFIG_PPC64 | |
f6f7dde3 | 402 | #define REG "%016lx" |
06d67d54 PM |
403 | #define REGS_PER_LINE 4 |
404 | #define LAST_VOLATILE 13 | |
405 | #else | |
f6f7dde3 | 406 | #define REG "%08lx" |
06d67d54 PM |
407 | #define REGS_PER_LINE 8 |
408 | #define LAST_VOLATILE 12 | |
409 | #endif | |
410 | ||
14cf11af PM |
411 | void show_regs(struct pt_regs * regs) |
412 | { | |
413 | int i, trap; | |
414 | ||
06d67d54 PM |
415 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
416 | regs->nip, regs->link, regs->ctr); | |
417 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
96b644bd | 418 | regs, regs->trap, print_tainted(), init_utsname()->release); |
06d67d54 PM |
419 | printk("MSR: "REG" ", regs->msr); |
420 | printbits(regs->msr, msr_bits); | |
f6f7dde3 | 421 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); |
14cf11af PM |
422 | trap = TRAP(regs); |
423 | if (trap == 0x300 || trap == 0x600) | |
06d67d54 PM |
424 | printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr); |
425 | printk("TASK = %p[%d] '%s' THREAD: %p", | |
b5e2fc1c | 426 | current, current->pid, current->comm, task_thread_info(current)); |
14cf11af PM |
427 | |
428 | #ifdef CONFIG_SMP | |
429 | printk(" CPU: %d", smp_processor_id()); | |
430 | #endif /* CONFIG_SMP */ | |
431 | ||
432 | for (i = 0; i < 32; i++) { | |
06d67d54 | 433 | if ((i % REGS_PER_LINE) == 0) |
14cf11af | 434 | printk("\n" KERN_INFO "GPR%02d: ", i); |
06d67d54 PM |
435 | printk(REG " ", regs->gpr[i]); |
436 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
437 | break; |
438 | } | |
439 | printk("\n"); | |
440 | #ifdef CONFIG_KALLSYMS | |
441 | /* | |
442 | * Lookup NIP late so we have the best change of getting the | |
443 | * above info out without failing | |
444 | */ | |
06d67d54 | 445 | printk("NIP ["REG"] ", regs->nip); |
14cf11af | 446 | print_symbol("%s\n", regs->nip); |
06d67d54 | 447 | printk("LR ["REG"] ", regs->link); |
14cf11af PM |
448 | print_symbol("%s\n", regs->link); |
449 | #endif | |
450 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
451 | if (!user_mode(regs)) |
452 | show_instructions(regs); | |
14cf11af PM |
453 | } |
454 | ||
455 | void exit_thread(void) | |
456 | { | |
48abec07 | 457 | discard_lazy_cpu_state(); |
14cf11af PM |
458 | } |
459 | ||
460 | void flush_thread(void) | |
461 | { | |
06d67d54 PM |
462 | #ifdef CONFIG_PPC64 |
463 | struct thread_info *t = current_thread_info(); | |
464 | ||
f144e7c7 MD |
465 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
466 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
467 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
468 | clear_ti_thread_flag(t, TIF_32BIT); | |
469 | else | |
470 | set_ti_thread_flag(t, TIF_32BIT); | |
471 | } | |
06d67d54 | 472 | #endif |
06d67d54 | 473 | |
48abec07 | 474 | discard_lazy_cpu_state(); |
14cf11af PM |
475 | |
476 | #ifdef CONFIG_PPC64 /* for now */ | |
477 | if (current->thread.dabr) { | |
478 | current->thread.dabr = 0; | |
479 | set_dabr(0); | |
480 | } | |
481 | #endif | |
482 | } | |
483 | ||
484 | void | |
485 | release_thread(struct task_struct *t) | |
486 | { | |
487 | } | |
488 | ||
489 | /* | |
490 | * This gets called before we allocate a new thread and copy | |
491 | * the current task into it. | |
492 | */ | |
493 | void prepare_to_copy(struct task_struct *tsk) | |
494 | { | |
495 | flush_fp_to_thread(current); | |
496 | flush_altivec_to_thread(current); | |
497 | flush_spe_to_thread(current); | |
498 | } | |
499 | ||
500 | /* | |
501 | * Copy a thread.. | |
502 | */ | |
06d67d54 PM |
503 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, |
504 | unsigned long unused, struct task_struct *p, | |
505 | struct pt_regs *regs) | |
14cf11af PM |
506 | { |
507 | struct pt_regs *childregs, *kregs; | |
508 | extern void ret_from_fork(void); | |
0cec6fd1 | 509 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
510 | |
511 | CHECK_FULL_REGS(regs); | |
512 | /* Copy registers */ | |
513 | sp -= sizeof(struct pt_regs); | |
514 | childregs = (struct pt_regs *) sp; | |
515 | *childregs = *regs; | |
516 | if ((childregs->msr & MSR_PR) == 0) { | |
517 | /* for kernel thread, set `current' and stackptr in new task */ | |
518 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 519 | #ifdef CONFIG_PPC32 |
14cf11af | 520 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 521 | #else |
b5e2fc1c | 522 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 523 | #endif |
14cf11af PM |
524 | p->thread.regs = NULL; /* no user register state */ |
525 | } else { | |
526 | childregs->gpr[1] = usp; | |
527 | p->thread.regs = childregs; | |
06d67d54 PM |
528 | if (clone_flags & CLONE_SETTLS) { |
529 | #ifdef CONFIG_PPC64 | |
530 | if (!test_thread_flag(TIF_32BIT)) | |
531 | childregs->gpr[13] = childregs->gpr[6]; | |
532 | else | |
533 | #endif | |
534 | childregs->gpr[2] = childregs->gpr[6]; | |
535 | } | |
14cf11af PM |
536 | } |
537 | childregs->gpr[3] = 0; /* Result from fork() */ | |
538 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
539 | |
540 | /* | |
541 | * The way this works is that at some point in the future | |
542 | * some task will call _switch to switch to the new task. | |
543 | * That will pop off the stack frame created below and start | |
544 | * the new task running at ret_from_fork. The new task will | |
545 | * do some house keeping and then return from the fork or clone | |
546 | * system call, using the stack frame created above. | |
547 | */ | |
548 | sp -= sizeof(struct pt_regs); | |
549 | kregs = (struct pt_regs *) sp; | |
550 | sp -= STACK_FRAME_OVERHEAD; | |
551 | p->thread.ksp = sp; | |
14cf11af | 552 | |
06d67d54 PM |
553 | #ifdef CONFIG_PPC64 |
554 | if (cpu_has_feature(CPU_FTR_SLB)) { | |
555 | unsigned long sp_vsid = get_kernel_vsid(sp); | |
3c726f8d | 556 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 PM |
557 | |
558 | sp_vsid <<= SLB_VSID_SHIFT; | |
3c726f8d | 559 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
560 | p->thread.ksp_vsid = sp_vsid; |
561 | } | |
562 | ||
563 | /* | |
564 | * The PPC64 ABI makes use of a TOC to contain function | |
565 | * pointers. The function (ret_from_except) is actually a pointer | |
566 | * to the TOC entry. The first entry is a pointer to the actual | |
567 | * function. | |
568 | */ | |
569 | kregs->nip = *((unsigned long *)ret_from_fork); | |
570 | #else | |
571 | kregs->nip = (unsigned long)ret_from_fork; | |
06d67d54 | 572 | #endif |
14cf11af PM |
573 | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | * Set up a thread for executing a new program | |
579 | */ | |
06d67d54 | 580 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 581 | { |
90eac727 ME |
582 | #ifdef CONFIG_PPC64 |
583 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
584 | #endif | |
585 | ||
14cf11af | 586 | set_fs(USER_DS); |
06d67d54 PM |
587 | |
588 | /* | |
589 | * If we exec out of a kernel thread then thread.regs will not be | |
590 | * set. Do it now. | |
591 | */ | |
592 | if (!current->thread.regs) { | |
0cec6fd1 AV |
593 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
594 | current->thread.regs = regs - 1; | |
06d67d54 PM |
595 | } |
596 | ||
14cf11af PM |
597 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
598 | regs->ctr = 0; | |
599 | regs->link = 0; | |
600 | regs->xer = 0; | |
601 | regs->ccr = 0; | |
14cf11af | 602 | regs->gpr[1] = sp; |
06d67d54 PM |
603 | |
604 | #ifdef CONFIG_PPC32 | |
605 | regs->mq = 0; | |
606 | regs->nip = start; | |
14cf11af | 607 | regs->msr = MSR_USER; |
06d67d54 | 608 | #else |
d4bf9a78 | 609 | if (!test_thread_flag(TIF_32BIT)) { |
90eac727 | 610 | unsigned long entry, toc; |
06d67d54 PM |
611 | |
612 | /* start is a relocated pointer to the function descriptor for | |
613 | * the elf _start routine. The first entry in the function | |
614 | * descriptor is the entry address of _start and the second | |
615 | * entry is the TOC value we need to use. | |
616 | */ | |
617 | __get_user(entry, (unsigned long __user *)start); | |
618 | __get_user(toc, (unsigned long __user *)start+1); | |
619 | ||
620 | /* Check whether the e_entry function descriptor entries | |
621 | * need to be relocated before we can use them. | |
622 | */ | |
623 | if (load_addr != 0) { | |
624 | entry += load_addr; | |
625 | toc += load_addr; | |
626 | } | |
627 | regs->nip = entry; | |
628 | regs->gpr[2] = toc; | |
629 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
630 | } else { |
631 | regs->nip = start; | |
632 | regs->gpr[2] = 0; | |
633 | regs->msr = MSR_USER32; | |
06d67d54 PM |
634 | } |
635 | #endif | |
636 | ||
48abec07 | 637 | discard_lazy_cpu_state(); |
14cf11af | 638 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 639 | current->thread.fpscr.val = 0; |
14cf11af PM |
640 | #ifdef CONFIG_ALTIVEC |
641 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
642 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 643 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
644 | current->thread.vrsave = 0; |
645 | current->thread.used_vr = 0; | |
646 | #endif /* CONFIG_ALTIVEC */ | |
647 | #ifdef CONFIG_SPE | |
648 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
649 | current->thread.acc = 0; | |
650 | current->thread.spefscr = 0; | |
651 | current->thread.used_spe = 0; | |
652 | #endif /* CONFIG_SPE */ | |
653 | } | |
654 | ||
655 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
656 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
657 | ||
658 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
659 | { | |
660 | struct pt_regs *regs = tsk->thread.regs; | |
661 | ||
662 | /* This is a bit hairy. If we are an SPE enabled processor | |
663 | * (have embedded fp) we store the IEEE exception enable flags in | |
664 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
665 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
666 | if (val & PR_FP_EXC_SW_ENABLE) { | |
667 | #ifdef CONFIG_SPE | |
668 | tsk->thread.fpexc_mode = val & | |
669 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
06d67d54 | 670 | return 0; |
14cf11af PM |
671 | #else |
672 | return -EINVAL; | |
673 | #endif | |
14cf11af | 674 | } |
06d67d54 PM |
675 | |
676 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
677 | * __pack_fe01 use do not overlap with bits used for | |
678 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
679 | * on CONFIG_SPE implementations are reserved so writing to | |
680 | * them does not change anything */ | |
681 | if (val > PR_FP_EXC_PRECISE) | |
682 | return -EINVAL; | |
683 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
684 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
685 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
686 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
687 | return 0; |
688 | } | |
689 | ||
690 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
691 | { | |
692 | unsigned int val; | |
693 | ||
694 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
695 | #ifdef CONFIG_SPE | |
696 | val = tsk->thread.fpexc_mode; | |
697 | #else | |
698 | return -EINVAL; | |
699 | #endif | |
700 | else | |
701 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
702 | return put_user(val, (unsigned int __user *) adr); | |
703 | } | |
704 | ||
fab5db97 PM |
705 | int set_endian(struct task_struct *tsk, unsigned int val) |
706 | { | |
707 | struct pt_regs *regs = tsk->thread.regs; | |
708 | ||
709 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
710 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
711 | return -EINVAL; | |
712 | ||
713 | if (regs == NULL) | |
714 | return -EINVAL; | |
715 | ||
716 | if (val == PR_ENDIAN_BIG) | |
717 | regs->msr &= ~MSR_LE; | |
718 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
719 | regs->msr |= MSR_LE; | |
720 | else | |
721 | return -EINVAL; | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
727 | { | |
728 | struct pt_regs *regs = tsk->thread.regs; | |
729 | unsigned int val; | |
730 | ||
731 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
732 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
733 | return -EINVAL; | |
734 | ||
735 | if (regs == NULL) | |
736 | return -EINVAL; | |
737 | ||
738 | if (regs->msr & MSR_LE) { | |
739 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
740 | val = PR_ENDIAN_LITTLE; | |
741 | else | |
742 | val = PR_ENDIAN_PPC_LITTLE; | |
743 | } else | |
744 | val = PR_ENDIAN_BIG; | |
745 | ||
746 | return put_user(val, (unsigned int __user *)adr); | |
747 | } | |
748 | ||
e9370ae1 PM |
749 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
750 | { | |
751 | tsk->thread.align_ctl = val; | |
752 | return 0; | |
753 | } | |
754 | ||
755 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
756 | { | |
757 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
758 | } | |
759 | ||
06d67d54 PM |
760 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
761 | ||
14cf11af PM |
762 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
763 | int __user *parent_tidp, void __user *child_threadptr, | |
764 | int __user *child_tidp, int p6, | |
765 | struct pt_regs *regs) | |
766 | { | |
767 | CHECK_FULL_REGS(regs); | |
768 | if (usp == 0) | |
769 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 PM |
770 | #ifdef CONFIG_PPC64 |
771 | if (test_thread_flag(TIF_32BIT)) { | |
772 | parent_tidp = TRUNC_PTR(parent_tidp); | |
773 | child_tidp = TRUNC_PTR(child_tidp); | |
774 | } | |
775 | #endif | |
14cf11af PM |
776 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
777 | } | |
778 | ||
779 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
780 | unsigned long p4, unsigned long p5, unsigned long p6, | |
781 | struct pt_regs *regs) | |
782 | { | |
783 | CHECK_FULL_REGS(regs); | |
784 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
785 | } | |
786 | ||
787 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
788 | unsigned long p4, unsigned long p5, unsigned long p6, | |
789 | struct pt_regs *regs) | |
790 | { | |
791 | CHECK_FULL_REGS(regs); | |
792 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
793 | regs, 0, NULL, NULL); | |
794 | } | |
795 | ||
796 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
797 | unsigned long a3, unsigned long a4, unsigned long a5, | |
798 | struct pt_regs *regs) | |
799 | { | |
800 | int error; | |
06d67d54 | 801 | char *filename; |
14cf11af PM |
802 | |
803 | filename = getname((char __user *) a0); | |
804 | error = PTR_ERR(filename); | |
805 | if (IS_ERR(filename)) | |
806 | goto out; | |
807 | flush_fp_to_thread(current); | |
808 | flush_altivec_to_thread(current); | |
809 | flush_spe_to_thread(current); | |
20c8c210 PM |
810 | error = do_execve(filename, (char __user * __user *) a1, |
811 | (char __user * __user *) a2, regs); | |
14cf11af PM |
812 | if (error == 0) { |
813 | task_lock(current); | |
814 | current->ptrace &= ~PT_DTRACE; | |
815 | task_unlock(current); | |
816 | } | |
817 | putname(filename); | |
818 | out: | |
819 | return error; | |
820 | } | |
821 | ||
bb72c481 PM |
822 | #ifdef CONFIG_IRQSTACKS |
823 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, | |
824 | unsigned long nbytes) | |
825 | { | |
826 | unsigned long stack_page; | |
827 | unsigned long cpu = task_cpu(p); | |
828 | ||
829 | /* | |
830 | * Avoid crashing if the stack has overflowed and corrupted | |
831 | * task_cpu(p), which is in the thread_info struct. | |
832 | */ | |
833 | if (cpu < NR_CPUS && cpu_possible(cpu)) { | |
834 | stack_page = (unsigned long) hardirq_ctx[cpu]; | |
835 | if (sp >= stack_page + sizeof(struct thread_struct) | |
836 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
837 | return 1; | |
838 | ||
839 | stack_page = (unsigned long) softirq_ctx[cpu]; | |
840 | if (sp >= stack_page + sizeof(struct thread_struct) | |
841 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
842 | return 1; | |
843 | } | |
844 | return 0; | |
845 | } | |
846 | ||
847 | #else | |
848 | #define valid_irq_stack(sp, p, nb) 0 | |
849 | #endif /* CONFIG_IRQSTACKS */ | |
850 | ||
2f25194d | 851 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
852 | unsigned long nbytes) |
853 | { | |
0cec6fd1 | 854 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
855 | |
856 | if (sp >= stack_page + sizeof(struct thread_struct) | |
857 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
858 | return 1; | |
859 | ||
bb72c481 | 860 | return valid_irq_stack(sp, p, nbytes); |
14cf11af PM |
861 | } |
862 | ||
06d67d54 PM |
863 | #ifdef CONFIG_PPC64 |
864 | #define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */ | |
865 | #define FRAME_LR_SAVE 2 | |
866 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288) | |
867 | #define REGS_MARKER 0x7265677368657265ul | |
868 | #define FRAME_MARKER 12 | |
869 | #else | |
870 | #define MIN_STACK_FRAME 16 | |
871 | #define FRAME_LR_SAVE 1 | |
872 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) | |
873 | #define REGS_MARKER 0x72656773ul | |
874 | #define FRAME_MARKER 2 | |
14cf11af | 875 | #endif |
14cf11af | 876 | |
2f25194d AB |
877 | EXPORT_SYMBOL(validate_sp); |
878 | ||
14cf11af PM |
879 | unsigned long get_wchan(struct task_struct *p) |
880 | { | |
881 | unsigned long ip, sp; | |
882 | int count = 0; | |
883 | ||
884 | if (!p || p == current || p->state == TASK_RUNNING) | |
885 | return 0; | |
886 | ||
887 | sp = p->thread.ksp; | |
06d67d54 | 888 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
889 | return 0; |
890 | ||
891 | do { | |
892 | sp = *(unsigned long *)sp; | |
06d67d54 | 893 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
894 | return 0; |
895 | if (count > 0) { | |
06d67d54 | 896 | ip = ((unsigned long *)sp)[FRAME_LR_SAVE]; |
14cf11af PM |
897 | if (!in_sched_functions(ip)) |
898 | return ip; | |
899 | } | |
900 | } while (count++ < 16); | |
901 | return 0; | |
902 | } | |
06d67d54 PM |
903 | |
904 | static int kstack_depth_to_print = 64; | |
905 | ||
906 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
907 | { | |
908 | unsigned long sp, ip, lr, newsp; | |
909 | int count = 0; | |
910 | int firstframe = 1; | |
911 | ||
912 | sp = (unsigned long) stack; | |
913 | if (tsk == NULL) | |
914 | tsk = current; | |
915 | if (sp == 0) { | |
916 | if (tsk == current) | |
917 | asm("mr %0,1" : "=r" (sp)); | |
918 | else | |
919 | sp = tsk->thread.ksp; | |
920 | } | |
921 | ||
922 | lr = 0; | |
923 | printk("Call Trace:\n"); | |
924 | do { | |
925 | if (!validate_sp(sp, tsk, MIN_STACK_FRAME)) | |
926 | return; | |
927 | ||
928 | stack = (unsigned long *) sp; | |
929 | newsp = stack[0]; | |
930 | ip = stack[FRAME_LR_SAVE]; | |
931 | if (!firstframe || ip != lr) { | |
932 | printk("["REG"] ["REG"] ", sp, ip); | |
933 | print_symbol("%s", ip); | |
934 | if (firstframe) | |
935 | printk(" (unreliable)"); | |
936 | printk("\n"); | |
937 | } | |
938 | firstframe = 0; | |
939 | ||
940 | /* | |
941 | * See if this is an exception frame. | |
942 | * We look for the "regshere" marker in the current frame. | |
943 | */ | |
944 | if (validate_sp(sp, tsk, INT_FRAME_SIZE) | |
945 | && stack[FRAME_MARKER] == REGS_MARKER) { | |
946 | struct pt_regs *regs = (struct pt_regs *) | |
947 | (sp + STACK_FRAME_OVERHEAD); | |
948 | printk("--- Exception: %lx", regs->trap); | |
949 | print_symbol(" at %s\n", regs->nip); | |
950 | lr = regs->link; | |
951 | print_symbol(" LR = %s\n", lr); | |
952 | firstframe = 1; | |
953 | } | |
954 | ||
955 | sp = newsp; | |
956 | } while (count++ < kstack_depth_to_print); | |
957 | } | |
958 | ||
959 | void dump_stack(void) | |
960 | { | |
961 | show_stack(current, NULL); | |
962 | } | |
963 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
964 | |
965 | #ifdef CONFIG_PPC64 | |
966 | void ppc64_runlatch_on(void) | |
967 | { | |
968 | unsigned long ctrl; | |
969 | ||
970 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
971 | HMT_medium(); | |
972 | ||
973 | ctrl = mfspr(SPRN_CTRLF); | |
974 | ctrl |= CTRL_RUNLATCH; | |
975 | mtspr(SPRN_CTRLT, ctrl); | |
976 | ||
977 | set_thread_flag(TIF_RUNLATCH); | |
978 | } | |
979 | } | |
980 | ||
981 | void ppc64_runlatch_off(void) | |
982 | { | |
983 | unsigned long ctrl; | |
984 | ||
985 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { | |
986 | HMT_medium(); | |
987 | ||
988 | clear_thread_flag(TIF_RUNLATCH); | |
989 | ||
990 | ctrl = mfspr(SPRN_CTRLF); | |
991 | ctrl &= ~CTRL_RUNLATCH; | |
992 | mtspr(SPRN_CTRLT, ctrl); | |
993 | } | |
994 | } | |
995 | #endif |