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; | |
ce48b210 | 56 | struct task_struct *last_task_used_vsx = NULL; |
14cf11af PM |
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 | |
0ee6c15e | 87 | giveup_fpu(tsk); |
14cf11af PM |
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 | { | |
ce48b210 MN |
110 | #ifdef CONFIG_VSX |
111 | int i; | |
112 | elf_fpreg_t *reg; | |
113 | #endif | |
114 | ||
14cf11af PM |
115 | if (!tsk->thread.regs) |
116 | return 0; | |
117 | flush_fp_to_thread(current); | |
118 | ||
ce48b210 MN |
119 | #ifdef CONFIG_VSX |
120 | reg = (elf_fpreg_t *)fpregs; | |
121 | for (i = 0; i < ELF_NFPREG - 1; i++, reg++) | |
122 | *reg = tsk->thread.TS_FPR(i); | |
123 | memcpy(reg, &tsk->thread.fpscr, sizeof(elf_fpreg_t)); | |
124 | #else | |
9c75a31c | 125 | memcpy(fpregs, &tsk->thread.TS_FPR(0), sizeof(*fpregs)); |
ce48b210 | 126 | #endif |
14cf11af PM |
127 | |
128 | return 1; | |
129 | } | |
130 | ||
131 | #ifdef CONFIG_ALTIVEC | |
132 | void enable_kernel_altivec(void) | |
133 | { | |
134 | WARN_ON(preemptible()); | |
135 | ||
136 | #ifdef CONFIG_SMP | |
137 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) | |
138 | giveup_altivec(current); | |
139 | else | |
140 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ | |
141 | #else | |
142 | giveup_altivec(last_task_used_altivec); | |
143 | #endif /* CONFIG_SMP */ | |
144 | } | |
145 | EXPORT_SYMBOL(enable_kernel_altivec); | |
146 | ||
147 | /* | |
148 | * Make sure the VMX/Altivec register state in the | |
149 | * the thread_struct is up to date for task tsk. | |
150 | */ | |
151 | void flush_altivec_to_thread(struct task_struct *tsk) | |
152 | { | |
153 | if (tsk->thread.regs) { | |
154 | preempt_disable(); | |
155 | if (tsk->thread.regs->msr & MSR_VEC) { | |
156 | #ifdef CONFIG_SMP | |
157 | BUG_ON(tsk != current); | |
158 | #endif | |
0ee6c15e | 159 | giveup_altivec(tsk); |
14cf11af PM |
160 | } |
161 | preempt_enable(); | |
162 | } | |
163 | } | |
164 | ||
f3e909c2 | 165 | int dump_task_altivec(struct task_struct *tsk, elf_vrregset_t *vrregs) |
14cf11af | 166 | { |
1f7d6668 MN |
167 | /* ELF_NVRREG includes the VSCR and VRSAVE which we need to save |
168 | * separately, see below */ | |
169 | const int nregs = ELF_NVRREG - 2; | |
170 | elf_vrreg_t *reg; | |
171 | u32 *dest; | |
172 | ||
173 | if (tsk == current) | |
174 | flush_altivec_to_thread(tsk); | |
175 | ||
176 | reg = (elf_vrreg_t *)vrregs; | |
177 | ||
178 | /* copy the 32 vr registers */ | |
179 | memcpy(reg, &tsk->thread.vr[0], nregs * sizeof(*reg)); | |
180 | reg += nregs; | |
181 | ||
182 | /* copy the vscr */ | |
183 | memcpy(reg, &tsk->thread.vscr, sizeof(*reg)); | |
184 | reg++; | |
185 | ||
186 | /* vrsave is stored in the high 32bit slot of the final 128bits */ | |
187 | memset(reg, 0, sizeof(*reg)); | |
188 | dest = (u32 *)reg; | |
189 | *dest = tsk->thread.vrsave; | |
190 | ||
14cf11af PM |
191 | return 1; |
192 | } | |
193 | #endif /* CONFIG_ALTIVEC */ | |
194 | ||
ce48b210 MN |
195 | #ifdef CONFIG_VSX |
196 | #if 0 | |
197 | /* not currently used, but some crazy RAID module might want to later */ | |
198 | void enable_kernel_vsx(void) | |
199 | { | |
200 | WARN_ON(preemptible()); | |
201 | ||
202 | #ifdef CONFIG_SMP | |
203 | if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) | |
204 | giveup_vsx(current); | |
205 | else | |
206 | giveup_vsx(NULL); /* just enable vsx for kernel - force */ | |
207 | #else | |
208 | giveup_vsx(last_task_used_vsx); | |
209 | #endif /* CONFIG_SMP */ | |
210 | } | |
211 | EXPORT_SYMBOL(enable_kernel_vsx); | |
212 | #endif | |
213 | ||
214 | void flush_vsx_to_thread(struct task_struct *tsk) | |
215 | { | |
216 | if (tsk->thread.regs) { | |
217 | preempt_disable(); | |
218 | if (tsk->thread.regs->msr & MSR_VSX) { | |
219 | #ifdef CONFIG_SMP | |
220 | BUG_ON(tsk != current); | |
221 | #endif | |
222 | giveup_vsx(tsk); | |
223 | } | |
224 | preempt_enable(); | |
225 | } | |
226 | } | |
227 | ||
228 | /* | |
229 | * This dumps the lower half 64bits of the first 32 VSX registers. | |
230 | * This needs to be called with dump_task_fp and dump_task_altivec to | |
231 | * get all the VSX state. | |
232 | */ | |
233 | int dump_task_vsx(struct task_struct *tsk, elf_vrreg_t *vrregs) | |
234 | { | |
235 | elf_vrreg_t *reg; | |
236 | double buf[32]; | |
237 | int i; | |
238 | ||
239 | if (tsk == current) | |
240 | flush_vsx_to_thread(tsk); | |
241 | ||
242 | reg = (elf_vrreg_t *)vrregs; | |
243 | ||
244 | for (i = 0; i < 32 ; i++) | |
245 | buf[i] = current->thread.fpr[i][TS_VSRLOWOFFSET]; | |
246 | memcpy(reg, buf, sizeof(buf)); | |
247 | ||
248 | return 1; | |
249 | } | |
250 | #endif /* CONFIG_VSX */ | |
251 | ||
14cf11af PM |
252 | #ifdef CONFIG_SPE |
253 | ||
254 | void enable_kernel_spe(void) | |
255 | { | |
256 | WARN_ON(preemptible()); | |
257 | ||
258 | #ifdef CONFIG_SMP | |
259 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) | |
260 | giveup_spe(current); | |
261 | else | |
262 | giveup_spe(NULL); /* just enable SPE for kernel - force */ | |
263 | #else | |
264 | giveup_spe(last_task_used_spe); | |
265 | #endif /* __SMP __ */ | |
266 | } | |
267 | EXPORT_SYMBOL(enable_kernel_spe); | |
268 | ||
269 | void flush_spe_to_thread(struct task_struct *tsk) | |
270 | { | |
271 | if (tsk->thread.regs) { | |
272 | preempt_disable(); | |
273 | if (tsk->thread.regs->msr & MSR_SPE) { | |
274 | #ifdef CONFIG_SMP | |
275 | BUG_ON(tsk != current); | |
276 | #endif | |
0ee6c15e | 277 | giveup_spe(tsk); |
14cf11af PM |
278 | } |
279 | preempt_enable(); | |
280 | } | |
281 | } | |
282 | ||
283 | int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs) | |
284 | { | |
285 | flush_spe_to_thread(current); | |
286 | /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */ | |
287 | memcpy(evrregs, ¤t->thread.evr[0], sizeof(u32) * 35); | |
288 | return 1; | |
289 | } | |
290 | #endif /* CONFIG_SPE */ | |
291 | ||
5388fb10 | 292 | #ifndef CONFIG_SMP |
48abec07 PM |
293 | /* |
294 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), | |
295 | * and the current task has some state, discard it. | |
296 | */ | |
5388fb10 | 297 | void discard_lazy_cpu_state(void) |
48abec07 | 298 | { |
48abec07 PM |
299 | preempt_disable(); |
300 | if (last_task_used_math == current) | |
301 | last_task_used_math = NULL; | |
302 | #ifdef CONFIG_ALTIVEC | |
303 | if (last_task_used_altivec == current) | |
304 | last_task_used_altivec = NULL; | |
305 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
306 | #ifdef CONFIG_VSX |
307 | if (last_task_used_vsx == current) | |
308 | last_task_used_vsx = NULL; | |
309 | #endif /* CONFIG_VSX */ | |
48abec07 PM |
310 | #ifdef CONFIG_SPE |
311 | if (last_task_used_spe == current) | |
312 | last_task_used_spe = NULL; | |
313 | #endif | |
314 | preempt_enable(); | |
48abec07 | 315 | } |
5388fb10 | 316 | #endif /* CONFIG_SMP */ |
48abec07 | 317 | |
a2ceff5e ME |
318 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
319 | ||
14cf11af PM |
320 | int set_dabr(unsigned long dabr) |
321 | { | |
a2ceff5e ME |
322 | __get_cpu_var(current_dabr) = dabr; |
323 | ||
791cc501 | 324 | #ifdef CONFIG_PPC_MERGE /* XXX for now */ |
cab0af98 ME |
325 | if (ppc_md.set_dabr) |
326 | return ppc_md.set_dabr(dabr); | |
791cc501 | 327 | #endif |
14cf11af | 328 | |
791cc501 BH |
329 | /* XXX should we have a CPU_FTR_HAS_DABR ? */ |
330 | #if defined(CONFIG_PPC64) || defined(CONFIG_6xx) | |
cab0af98 | 331 | mtspr(SPRN_DABR, dabr); |
791cc501 | 332 | #endif |
cab0af98 | 333 | return 0; |
14cf11af PM |
334 | } |
335 | ||
06d67d54 PM |
336 | #ifdef CONFIG_PPC64 |
337 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
06d67d54 | 338 | #endif |
14cf11af PM |
339 | |
340 | struct task_struct *__switch_to(struct task_struct *prev, | |
341 | struct task_struct *new) | |
342 | { | |
343 | struct thread_struct *new_thread, *old_thread; | |
344 | unsigned long flags; | |
345 | struct task_struct *last; | |
346 | ||
347 | #ifdef CONFIG_SMP | |
348 | /* avoid complexity of lazy save/restore of fpu | |
349 | * by just saving it every time we switch out if | |
350 | * this task used the fpu during the last quantum. | |
351 | * | |
352 | * If it tries to use the fpu again, it'll trap and | |
353 | * reload its fp regs. So we don't have to do a restore | |
354 | * every switch, just a save. | |
355 | * -- Cort | |
356 | */ | |
357 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) | |
358 | giveup_fpu(prev); | |
359 | #ifdef CONFIG_ALTIVEC | |
360 | /* | |
361 | * If the previous thread used altivec in the last quantum | |
362 | * (thus changing altivec regs) then save them. | |
363 | * We used to check the VRSAVE register but not all apps | |
364 | * set it, so we don't rely on it now (and in fact we need | |
365 | * to save & restore VSCR even if VRSAVE == 0). -- paulus | |
366 | * | |
367 | * On SMP we always save/restore altivec regs just to avoid the | |
368 | * complexity of changing processors. | |
369 | * -- Cort | |
370 | */ | |
371 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) | |
372 | giveup_altivec(prev); | |
14cf11af | 373 | #endif /* CONFIG_ALTIVEC */ |
ce48b210 MN |
374 | #ifdef CONFIG_VSX |
375 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VSX)) | |
376 | giveup_vsx(prev); | |
377 | #endif /* CONFIG_VSX */ | |
14cf11af PM |
378 | #ifdef CONFIG_SPE |
379 | /* | |
380 | * If the previous thread used spe in the last quantum | |
381 | * (thus changing spe regs) then save them. | |
382 | * | |
383 | * On SMP we always save/restore spe regs just to avoid the | |
384 | * complexity of changing processors. | |
385 | */ | |
386 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) | |
387 | giveup_spe(prev); | |
c0c0d996 PM |
388 | #endif /* CONFIG_SPE */ |
389 | ||
390 | #else /* CONFIG_SMP */ | |
391 | #ifdef CONFIG_ALTIVEC | |
392 | /* Avoid the trap. On smp this this never happens since | |
393 | * we don't set last_task_used_altivec -- Cort | |
394 | */ | |
395 | if (new->thread.regs && last_task_used_altivec == new) | |
396 | new->thread.regs->msr |= MSR_VEC; | |
397 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
398 | #ifdef CONFIG_VSX |
399 | if (new->thread.regs && last_task_used_vsx == new) | |
400 | new->thread.regs->msr |= MSR_VSX; | |
401 | #endif /* CONFIG_VSX */ | |
c0c0d996 | 402 | #ifdef CONFIG_SPE |
14cf11af PM |
403 | /* Avoid the trap. On smp this this never happens since |
404 | * we don't set last_task_used_spe | |
405 | */ | |
406 | if (new->thread.regs && last_task_used_spe == new) | |
407 | new->thread.regs->msr |= MSR_SPE; | |
408 | #endif /* CONFIG_SPE */ | |
c0c0d996 | 409 | |
14cf11af PM |
410 | #endif /* CONFIG_SMP */ |
411 | ||
a2ceff5e | 412 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) |
14cf11af | 413 | set_dabr(new->thread.dabr); |
14cf11af PM |
414 | |
415 | new_thread = &new->thread; | |
416 | old_thread = ¤t->thread; | |
06d67d54 PM |
417 | |
418 | #ifdef CONFIG_PPC64 | |
419 | /* | |
420 | * Collect processor utilization data per process | |
421 | */ | |
422 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
423 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); | |
424 | long unsigned start_tb, current_tb; | |
425 | start_tb = old_thread->start_tb; | |
426 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
427 | old_thread->accum_tb += (current_tb - start_tb); | |
428 | new_thread->start_tb = current_tb; | |
429 | } | |
430 | #endif | |
431 | ||
14cf11af | 432 | local_irq_save(flags); |
c6622f63 PM |
433 | |
434 | account_system_vtime(current); | |
81a3843f | 435 | account_process_vtime(current); |
c6622f63 PM |
436 | calculate_steal_time(); |
437 | ||
44387e9f AB |
438 | /* |
439 | * We can't take a PMU exception inside _switch() since there is a | |
440 | * window where the kernel stack SLB and the kernel stack are out | |
441 | * of sync. Hard disable here. | |
442 | */ | |
443 | hard_irq_disable(); | |
14cf11af PM |
444 | last = _switch(old_thread, new_thread); |
445 | ||
446 | local_irq_restore(flags); | |
447 | ||
448 | return last; | |
449 | } | |
450 | ||
06d67d54 PM |
451 | static int instructions_to_print = 16; |
452 | ||
06d67d54 PM |
453 | static void show_instructions(struct pt_regs *regs) |
454 | { | |
455 | int i; | |
456 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
457 | sizeof(int)); | |
458 | ||
459 | printk("Instruction dump:"); | |
460 | ||
461 | for (i = 0; i < instructions_to_print; i++) { | |
462 | int instr; | |
463 | ||
464 | if (!(i % 8)) | |
465 | printk("\n"); | |
466 | ||
0de2d820 SW |
467 | #if !defined(CONFIG_BOOKE) |
468 | /* If executing with the IMMU off, adjust pc rather | |
469 | * than print XXXXXXXX. | |
470 | */ | |
471 | if (!(regs->msr & MSR_IR)) | |
472 | pc = (unsigned long)phys_to_virt(pc); | |
473 | #endif | |
474 | ||
af308377 SR |
475 | /* We use __get_user here *only* to avoid an OOPS on a |
476 | * bad address because the pc *should* only be a | |
477 | * kernel address. | |
478 | */ | |
00ae36de AB |
479 | if (!__kernel_text_address(pc) || |
480 | __get_user(instr, (unsigned int __user *)pc)) { | |
06d67d54 PM |
481 | printk("XXXXXXXX "); |
482 | } else { | |
483 | if (regs->nip == pc) | |
484 | printk("<%08x> ", instr); | |
485 | else | |
486 | printk("%08x ", instr); | |
487 | } | |
488 | ||
489 | pc += sizeof(int); | |
490 | } | |
491 | ||
492 | printk("\n"); | |
493 | } | |
494 | ||
495 | static struct regbit { | |
496 | unsigned long bit; | |
497 | const char *name; | |
498 | } msr_bits[] = { | |
499 | {MSR_EE, "EE"}, | |
500 | {MSR_PR, "PR"}, | |
501 | {MSR_FP, "FP"}, | |
ce48b210 MN |
502 | {MSR_VEC, "VEC"}, |
503 | {MSR_VSX, "VSX"}, | |
06d67d54 PM |
504 | {MSR_ME, "ME"}, |
505 | {MSR_IR, "IR"}, | |
506 | {MSR_DR, "DR"}, | |
507 | {0, NULL} | |
508 | }; | |
509 | ||
510 | static void printbits(unsigned long val, struct regbit *bits) | |
511 | { | |
512 | const char *sep = ""; | |
513 | ||
514 | printk("<"); | |
515 | for (; bits->bit; ++bits) | |
516 | if (val & bits->bit) { | |
517 | printk("%s%s", sep, bits->name); | |
518 | sep = ","; | |
519 | } | |
520 | printk(">"); | |
521 | } | |
522 | ||
523 | #ifdef CONFIG_PPC64 | |
f6f7dde3 | 524 | #define REG "%016lx" |
06d67d54 PM |
525 | #define REGS_PER_LINE 4 |
526 | #define LAST_VOLATILE 13 | |
527 | #else | |
f6f7dde3 | 528 | #define REG "%08lx" |
06d67d54 PM |
529 | #define REGS_PER_LINE 8 |
530 | #define LAST_VOLATILE 12 | |
531 | #endif | |
532 | ||
14cf11af PM |
533 | void show_regs(struct pt_regs * regs) |
534 | { | |
535 | int i, trap; | |
536 | ||
06d67d54 PM |
537 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
538 | regs->nip, regs->link, regs->ctr); | |
539 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
96b644bd | 540 | regs, regs->trap, print_tainted(), init_utsname()->release); |
06d67d54 PM |
541 | printk("MSR: "REG" ", regs->msr); |
542 | printbits(regs->msr, msr_bits); | |
f6f7dde3 | 543 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); |
14cf11af PM |
544 | trap = TRAP(regs); |
545 | if (trap == 0x300 || trap == 0x600) | |
14170789 KG |
546 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
547 | printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr); | |
548 | #else | |
06d67d54 | 549 | printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr); |
14170789 | 550 | #endif |
06d67d54 | 551 | printk("TASK = %p[%d] '%s' THREAD: %p", |
19c5870c | 552 | current, task_pid_nr(current), current->comm, task_thread_info(current)); |
14cf11af PM |
553 | |
554 | #ifdef CONFIG_SMP | |
79ccd1be | 555 | printk(" CPU: %d", raw_smp_processor_id()); |
14cf11af PM |
556 | #endif /* CONFIG_SMP */ |
557 | ||
558 | for (i = 0; i < 32; i++) { | |
06d67d54 | 559 | if ((i % REGS_PER_LINE) == 0) |
14cf11af | 560 | printk("\n" KERN_INFO "GPR%02d: ", i); |
06d67d54 PM |
561 | printk(REG " ", regs->gpr[i]); |
562 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
563 | break; |
564 | } | |
565 | printk("\n"); | |
566 | #ifdef CONFIG_KALLSYMS | |
567 | /* | |
568 | * Lookup NIP late so we have the best change of getting the | |
569 | * above info out without failing | |
570 | */ | |
06d67d54 | 571 | printk("NIP ["REG"] ", regs->nip); |
14cf11af | 572 | print_symbol("%s\n", regs->nip); |
06d67d54 | 573 | printk("LR ["REG"] ", regs->link); |
14cf11af PM |
574 | print_symbol("%s\n", regs->link); |
575 | #endif | |
576 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
577 | if (!user_mode(regs)) |
578 | show_instructions(regs); | |
14cf11af PM |
579 | } |
580 | ||
581 | void exit_thread(void) | |
582 | { | |
48abec07 | 583 | discard_lazy_cpu_state(); |
14cf11af PM |
584 | } |
585 | ||
586 | void flush_thread(void) | |
587 | { | |
06d67d54 PM |
588 | #ifdef CONFIG_PPC64 |
589 | struct thread_info *t = current_thread_info(); | |
590 | ||
f144e7c7 MD |
591 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
592 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
593 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
594 | clear_ti_thread_flag(t, TIF_32BIT); | |
595 | else | |
596 | set_ti_thread_flag(t, TIF_32BIT); | |
597 | } | |
06d67d54 | 598 | #endif |
06d67d54 | 599 | |
48abec07 | 600 | discard_lazy_cpu_state(); |
14cf11af | 601 | |
14cf11af PM |
602 | if (current->thread.dabr) { |
603 | current->thread.dabr = 0; | |
604 | set_dabr(0); | |
605 | } | |
14cf11af PM |
606 | } |
607 | ||
608 | void | |
609 | release_thread(struct task_struct *t) | |
610 | { | |
611 | } | |
612 | ||
613 | /* | |
614 | * This gets called before we allocate a new thread and copy | |
615 | * the current task into it. | |
616 | */ | |
617 | void prepare_to_copy(struct task_struct *tsk) | |
618 | { | |
619 | flush_fp_to_thread(current); | |
620 | flush_altivec_to_thread(current); | |
ce48b210 | 621 | flush_vsx_to_thread(current); |
14cf11af PM |
622 | flush_spe_to_thread(current); |
623 | } | |
624 | ||
625 | /* | |
626 | * Copy a thread.. | |
627 | */ | |
06d67d54 PM |
628 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, |
629 | unsigned long unused, struct task_struct *p, | |
630 | struct pt_regs *regs) | |
14cf11af PM |
631 | { |
632 | struct pt_regs *childregs, *kregs; | |
633 | extern void ret_from_fork(void); | |
0cec6fd1 | 634 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
635 | |
636 | CHECK_FULL_REGS(regs); | |
637 | /* Copy registers */ | |
638 | sp -= sizeof(struct pt_regs); | |
639 | childregs = (struct pt_regs *) sp; | |
640 | *childregs = *regs; | |
641 | if ((childregs->msr & MSR_PR) == 0) { | |
642 | /* for kernel thread, set `current' and stackptr in new task */ | |
643 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 644 | #ifdef CONFIG_PPC32 |
14cf11af | 645 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 646 | #else |
b5e2fc1c | 647 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 648 | #endif |
14cf11af PM |
649 | p->thread.regs = NULL; /* no user register state */ |
650 | } else { | |
651 | childregs->gpr[1] = usp; | |
652 | p->thread.regs = childregs; | |
06d67d54 PM |
653 | if (clone_flags & CLONE_SETTLS) { |
654 | #ifdef CONFIG_PPC64 | |
655 | if (!test_thread_flag(TIF_32BIT)) | |
656 | childregs->gpr[13] = childregs->gpr[6]; | |
657 | else | |
658 | #endif | |
659 | childregs->gpr[2] = childregs->gpr[6]; | |
660 | } | |
14cf11af PM |
661 | } |
662 | childregs->gpr[3] = 0; /* Result from fork() */ | |
663 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
664 | |
665 | /* | |
666 | * The way this works is that at some point in the future | |
667 | * some task will call _switch to switch to the new task. | |
668 | * That will pop off the stack frame created below and start | |
669 | * the new task running at ret_from_fork. The new task will | |
670 | * do some house keeping and then return from the fork or clone | |
671 | * system call, using the stack frame created above. | |
672 | */ | |
673 | sp -= sizeof(struct pt_regs); | |
674 | kregs = (struct pt_regs *) sp; | |
675 | sp -= STACK_FRAME_OVERHEAD; | |
676 | p->thread.ksp = sp; | |
85218827 KG |
677 | p->thread.ksp_limit = (unsigned long)task_stack_page(p) + |
678 | _ALIGN_UP(sizeof(struct thread_info), 16); | |
14cf11af | 679 | |
06d67d54 PM |
680 | #ifdef CONFIG_PPC64 |
681 | if (cpu_has_feature(CPU_FTR_SLB)) { | |
1189be65 | 682 | unsigned long sp_vsid; |
3c726f8d | 683 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 | 684 | |
1189be65 PM |
685 | if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) |
686 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) | |
687 | << SLB_VSID_SHIFT_1T; | |
688 | else | |
689 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) | |
690 | << SLB_VSID_SHIFT; | |
3c726f8d | 691 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
692 | p->thread.ksp_vsid = sp_vsid; |
693 | } | |
694 | ||
695 | /* | |
696 | * The PPC64 ABI makes use of a TOC to contain function | |
697 | * pointers. The function (ret_from_except) is actually a pointer | |
698 | * to the TOC entry. The first entry is a pointer to the actual | |
699 | * function. | |
700 | */ | |
701 | kregs->nip = *((unsigned long *)ret_from_fork); | |
702 | #else | |
703 | kregs->nip = (unsigned long)ret_from_fork; | |
06d67d54 | 704 | #endif |
14cf11af PM |
705 | |
706 | return 0; | |
707 | } | |
708 | ||
709 | /* | |
710 | * Set up a thread for executing a new program | |
711 | */ | |
06d67d54 | 712 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 713 | { |
90eac727 ME |
714 | #ifdef CONFIG_PPC64 |
715 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
716 | #endif | |
717 | ||
14cf11af | 718 | set_fs(USER_DS); |
06d67d54 PM |
719 | |
720 | /* | |
721 | * If we exec out of a kernel thread then thread.regs will not be | |
722 | * set. Do it now. | |
723 | */ | |
724 | if (!current->thread.regs) { | |
0cec6fd1 AV |
725 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
726 | current->thread.regs = regs - 1; | |
06d67d54 PM |
727 | } |
728 | ||
14cf11af PM |
729 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
730 | regs->ctr = 0; | |
731 | regs->link = 0; | |
732 | regs->xer = 0; | |
733 | regs->ccr = 0; | |
14cf11af | 734 | regs->gpr[1] = sp; |
06d67d54 | 735 | |
474f8196 RM |
736 | /* |
737 | * We have just cleared all the nonvolatile GPRs, so make | |
738 | * FULL_REGS(regs) return true. This is necessary to allow | |
739 | * ptrace to examine the thread immediately after exec. | |
740 | */ | |
741 | regs->trap &= ~1UL; | |
742 | ||
06d67d54 PM |
743 | #ifdef CONFIG_PPC32 |
744 | regs->mq = 0; | |
745 | regs->nip = start; | |
14cf11af | 746 | regs->msr = MSR_USER; |
06d67d54 | 747 | #else |
d4bf9a78 | 748 | if (!test_thread_flag(TIF_32BIT)) { |
90eac727 | 749 | unsigned long entry, toc; |
06d67d54 PM |
750 | |
751 | /* start is a relocated pointer to the function descriptor for | |
752 | * the elf _start routine. The first entry in the function | |
753 | * descriptor is the entry address of _start and the second | |
754 | * entry is the TOC value we need to use. | |
755 | */ | |
756 | __get_user(entry, (unsigned long __user *)start); | |
757 | __get_user(toc, (unsigned long __user *)start+1); | |
758 | ||
759 | /* Check whether the e_entry function descriptor entries | |
760 | * need to be relocated before we can use them. | |
761 | */ | |
762 | if (load_addr != 0) { | |
763 | entry += load_addr; | |
764 | toc += load_addr; | |
765 | } | |
766 | regs->nip = entry; | |
767 | regs->gpr[2] = toc; | |
768 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
769 | } else { |
770 | regs->nip = start; | |
771 | regs->gpr[2] = 0; | |
772 | regs->msr = MSR_USER32; | |
06d67d54 PM |
773 | } |
774 | #endif | |
775 | ||
48abec07 | 776 | discard_lazy_cpu_state(); |
ce48b210 MN |
777 | #ifdef CONFIG_VSX |
778 | current->thread.used_vsr = 0; | |
779 | #endif | |
14cf11af | 780 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 781 | current->thread.fpscr.val = 0; |
14cf11af PM |
782 | #ifdef CONFIG_ALTIVEC |
783 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
784 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 785 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
786 | current->thread.vrsave = 0; |
787 | current->thread.used_vr = 0; | |
788 | #endif /* CONFIG_ALTIVEC */ | |
789 | #ifdef CONFIG_SPE | |
790 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
791 | current->thread.acc = 0; | |
792 | current->thread.spefscr = 0; | |
793 | current->thread.used_spe = 0; | |
794 | #endif /* CONFIG_SPE */ | |
795 | } | |
796 | ||
797 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
798 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
799 | ||
800 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
801 | { | |
802 | struct pt_regs *regs = tsk->thread.regs; | |
803 | ||
804 | /* This is a bit hairy. If we are an SPE enabled processor | |
805 | * (have embedded fp) we store the IEEE exception enable flags in | |
806 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
807 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
808 | if (val & PR_FP_EXC_SW_ENABLE) { | |
809 | #ifdef CONFIG_SPE | |
5e14d21e KG |
810 | if (cpu_has_feature(CPU_FTR_SPE)) { |
811 | tsk->thread.fpexc_mode = val & | |
812 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
813 | return 0; | |
814 | } else { | |
815 | return -EINVAL; | |
816 | } | |
14cf11af PM |
817 | #else |
818 | return -EINVAL; | |
819 | #endif | |
14cf11af | 820 | } |
06d67d54 PM |
821 | |
822 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
823 | * __pack_fe01 use do not overlap with bits used for | |
824 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
825 | * on CONFIG_SPE implementations are reserved so writing to | |
826 | * them does not change anything */ | |
827 | if (val > PR_FP_EXC_PRECISE) | |
828 | return -EINVAL; | |
829 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
830 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
831 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
832 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
833 | return 0; |
834 | } | |
835 | ||
836 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
837 | { | |
838 | unsigned int val; | |
839 | ||
840 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
841 | #ifdef CONFIG_SPE | |
5e14d21e KG |
842 | if (cpu_has_feature(CPU_FTR_SPE)) |
843 | val = tsk->thread.fpexc_mode; | |
844 | else | |
845 | return -EINVAL; | |
14cf11af PM |
846 | #else |
847 | return -EINVAL; | |
848 | #endif | |
849 | else | |
850 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
851 | return put_user(val, (unsigned int __user *) adr); | |
852 | } | |
853 | ||
fab5db97 PM |
854 | int set_endian(struct task_struct *tsk, unsigned int val) |
855 | { | |
856 | struct pt_regs *regs = tsk->thread.regs; | |
857 | ||
858 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
859 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
860 | return -EINVAL; | |
861 | ||
862 | if (regs == NULL) | |
863 | return -EINVAL; | |
864 | ||
865 | if (val == PR_ENDIAN_BIG) | |
866 | regs->msr &= ~MSR_LE; | |
867 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
868 | regs->msr |= MSR_LE; | |
869 | else | |
870 | return -EINVAL; | |
871 | ||
872 | return 0; | |
873 | } | |
874 | ||
875 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
876 | { | |
877 | struct pt_regs *regs = tsk->thread.regs; | |
878 | unsigned int val; | |
879 | ||
880 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
881 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
882 | return -EINVAL; | |
883 | ||
884 | if (regs == NULL) | |
885 | return -EINVAL; | |
886 | ||
887 | if (regs->msr & MSR_LE) { | |
888 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
889 | val = PR_ENDIAN_LITTLE; | |
890 | else | |
891 | val = PR_ENDIAN_PPC_LITTLE; | |
892 | } else | |
893 | val = PR_ENDIAN_BIG; | |
894 | ||
895 | return put_user(val, (unsigned int __user *)adr); | |
896 | } | |
897 | ||
e9370ae1 PM |
898 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
899 | { | |
900 | tsk->thread.align_ctl = val; | |
901 | return 0; | |
902 | } | |
903 | ||
904 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
905 | { | |
906 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
907 | } | |
908 | ||
06d67d54 PM |
909 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
910 | ||
14cf11af PM |
911 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
912 | int __user *parent_tidp, void __user *child_threadptr, | |
913 | int __user *child_tidp, int p6, | |
914 | struct pt_regs *regs) | |
915 | { | |
916 | CHECK_FULL_REGS(regs); | |
917 | if (usp == 0) | |
918 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 PM |
919 | #ifdef CONFIG_PPC64 |
920 | if (test_thread_flag(TIF_32BIT)) { | |
921 | parent_tidp = TRUNC_PTR(parent_tidp); | |
922 | child_tidp = TRUNC_PTR(child_tidp); | |
923 | } | |
924 | #endif | |
14cf11af PM |
925 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
926 | } | |
927 | ||
928 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
929 | unsigned long p4, unsigned long p5, unsigned long p6, | |
930 | struct pt_regs *regs) | |
931 | { | |
932 | CHECK_FULL_REGS(regs); | |
933 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
934 | } | |
935 | ||
936 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
937 | unsigned long p4, unsigned long p5, unsigned long p6, | |
938 | struct pt_regs *regs) | |
939 | { | |
940 | CHECK_FULL_REGS(regs); | |
941 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
942 | regs, 0, NULL, NULL); | |
943 | } | |
944 | ||
945 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
946 | unsigned long a3, unsigned long a4, unsigned long a5, | |
947 | struct pt_regs *regs) | |
948 | { | |
949 | int error; | |
06d67d54 | 950 | char *filename; |
14cf11af PM |
951 | |
952 | filename = getname((char __user *) a0); | |
953 | error = PTR_ERR(filename); | |
954 | if (IS_ERR(filename)) | |
955 | goto out; | |
956 | flush_fp_to_thread(current); | |
957 | flush_altivec_to_thread(current); | |
958 | flush_spe_to_thread(current); | |
20c8c210 PM |
959 | error = do_execve(filename, (char __user * __user *) a1, |
960 | (char __user * __user *) a2, regs); | |
14cf11af PM |
961 | putname(filename); |
962 | out: | |
963 | return error; | |
964 | } | |
965 | ||
bb72c481 PM |
966 | #ifdef CONFIG_IRQSTACKS |
967 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, | |
968 | unsigned long nbytes) | |
969 | { | |
970 | unsigned long stack_page; | |
971 | unsigned long cpu = task_cpu(p); | |
972 | ||
973 | /* | |
974 | * Avoid crashing if the stack has overflowed and corrupted | |
975 | * task_cpu(p), which is in the thread_info struct. | |
976 | */ | |
977 | if (cpu < NR_CPUS && cpu_possible(cpu)) { | |
978 | stack_page = (unsigned long) hardirq_ctx[cpu]; | |
979 | if (sp >= stack_page + sizeof(struct thread_struct) | |
980 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
981 | return 1; | |
982 | ||
983 | stack_page = (unsigned long) softirq_ctx[cpu]; | |
984 | if (sp >= stack_page + sizeof(struct thread_struct) | |
985 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
986 | return 1; | |
987 | } | |
988 | return 0; | |
989 | } | |
990 | ||
991 | #else | |
992 | #define valid_irq_stack(sp, p, nb) 0 | |
993 | #endif /* CONFIG_IRQSTACKS */ | |
994 | ||
2f25194d | 995 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
996 | unsigned long nbytes) |
997 | { | |
0cec6fd1 | 998 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
999 | |
1000 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1001 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1002 | return 1; | |
1003 | ||
bb72c481 | 1004 | return valid_irq_stack(sp, p, nbytes); |
14cf11af PM |
1005 | } |
1006 | ||
2f25194d AB |
1007 | EXPORT_SYMBOL(validate_sp); |
1008 | ||
14cf11af PM |
1009 | unsigned long get_wchan(struct task_struct *p) |
1010 | { | |
1011 | unsigned long ip, sp; | |
1012 | int count = 0; | |
1013 | ||
1014 | if (!p || p == current || p->state == TASK_RUNNING) | |
1015 | return 0; | |
1016 | ||
1017 | sp = p->thread.ksp; | |
ec2b36b9 | 1018 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
1019 | return 0; |
1020 | ||
1021 | do { | |
1022 | sp = *(unsigned long *)sp; | |
ec2b36b9 | 1023 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
1024 | return 0; |
1025 | if (count > 0) { | |
ec2b36b9 | 1026 | ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE]; |
14cf11af PM |
1027 | if (!in_sched_functions(ip)) |
1028 | return ip; | |
1029 | } | |
1030 | } while (count++ < 16); | |
1031 | return 0; | |
1032 | } | |
06d67d54 PM |
1033 | |
1034 | static int kstack_depth_to_print = 64; | |
1035 | ||
1036 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
1037 | { | |
1038 | unsigned long sp, ip, lr, newsp; | |
1039 | int count = 0; | |
1040 | int firstframe = 1; | |
1041 | ||
1042 | sp = (unsigned long) stack; | |
1043 | if (tsk == NULL) | |
1044 | tsk = current; | |
1045 | if (sp == 0) { | |
1046 | if (tsk == current) | |
1047 | asm("mr %0,1" : "=r" (sp)); | |
1048 | else | |
1049 | sp = tsk->thread.ksp; | |
1050 | } | |
1051 | ||
1052 | lr = 0; | |
1053 | printk("Call Trace:\n"); | |
1054 | do { | |
ec2b36b9 | 1055 | if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) |
06d67d54 PM |
1056 | return; |
1057 | ||
1058 | stack = (unsigned long *) sp; | |
1059 | newsp = stack[0]; | |
ec2b36b9 | 1060 | ip = stack[STACK_FRAME_LR_SAVE]; |
06d67d54 PM |
1061 | if (!firstframe || ip != lr) { |
1062 | printk("["REG"] ["REG"] ", sp, ip); | |
1063 | print_symbol("%s", ip); | |
1064 | if (firstframe) | |
1065 | printk(" (unreliable)"); | |
1066 | printk("\n"); | |
1067 | } | |
1068 | firstframe = 0; | |
1069 | ||
1070 | /* | |
1071 | * See if this is an exception frame. | |
1072 | * We look for the "regshere" marker in the current frame. | |
1073 | */ | |
ec2b36b9 BH |
1074 | if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) |
1075 | && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { | |
06d67d54 PM |
1076 | struct pt_regs *regs = (struct pt_regs *) |
1077 | (sp + STACK_FRAME_OVERHEAD); | |
1078 | printk("--- Exception: %lx", regs->trap); | |
1079 | print_symbol(" at %s\n", regs->nip); | |
1080 | lr = regs->link; | |
1081 | print_symbol(" LR = %s\n", lr); | |
1082 | firstframe = 1; | |
1083 | } | |
1084 | ||
1085 | sp = newsp; | |
1086 | } while (count++ < kstack_depth_to_print); | |
1087 | } | |
1088 | ||
1089 | void dump_stack(void) | |
1090 | { | |
1091 | show_stack(current, NULL); | |
1092 | } | |
1093 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
1094 | |
1095 | #ifdef CONFIG_PPC64 | |
1096 | void ppc64_runlatch_on(void) | |
1097 | { | |
1098 | unsigned long ctrl; | |
1099 | ||
1100 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
1101 | HMT_medium(); | |
1102 | ||
1103 | ctrl = mfspr(SPRN_CTRLF); | |
1104 | ctrl |= CTRL_RUNLATCH; | |
1105 | mtspr(SPRN_CTRLT, ctrl); | |
1106 | ||
1107 | set_thread_flag(TIF_RUNLATCH); | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | void ppc64_runlatch_off(void) | |
1112 | { | |
1113 | unsigned long ctrl; | |
1114 | ||
1115 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { | |
1116 | HMT_medium(); | |
1117 | ||
1118 | clear_thread_flag(TIF_RUNLATCH); | |
1119 | ||
1120 | ctrl = mfspr(SPRN_CTRLF); | |
1121 | ctrl &= ~CTRL_RUNLATCH; | |
1122 | mtspr(SPRN_CTRLT, ctrl); | |
1123 | } | |
1124 | } | |
1125 | #endif | |
f6a61680 BH |
1126 | |
1127 | #if THREAD_SHIFT < PAGE_SHIFT | |
1128 | ||
1129 | static struct kmem_cache *thread_info_cache; | |
1130 | ||
1131 | struct thread_info *alloc_thread_info(struct task_struct *tsk) | |
1132 | { | |
1133 | struct thread_info *ti; | |
1134 | ||
1135 | ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL); | |
1136 | if (unlikely(ti == NULL)) | |
1137 | return NULL; | |
1138 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
1139 | memset(ti, 0, THREAD_SIZE); | |
1140 | #endif | |
1141 | return ti; | |
1142 | } | |
1143 | ||
1144 | void free_thread_info(struct thread_info *ti) | |
1145 | { | |
1146 | kmem_cache_free(thread_info_cache, ti); | |
1147 | } | |
1148 | ||
1149 | void thread_info_cache_init(void) | |
1150 | { | |
1151 | thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, | |
1152 | THREAD_SIZE, 0, NULL); | |
1153 | BUG_ON(thread_info_cache == NULL); | |
1154 | } | |
1155 | ||
1156 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ |