Commit | Line | Data |
---|---|---|
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 |
d6a61bfc LM |
50 | #include <linux/kprobes.h> |
51 | #include <linux/kdebug.h> | |
14cf11af PM |
52 | |
53 | extern unsigned long _get_SP(void); | |
54 | ||
55 | #ifndef CONFIG_SMP | |
56 | struct task_struct *last_task_used_math = NULL; | |
57 | struct task_struct *last_task_used_altivec = NULL; | |
ce48b210 | 58 | struct task_struct *last_task_used_vsx = NULL; |
14cf11af PM |
59 | struct task_struct *last_task_used_spe = NULL; |
60 | #endif | |
61 | ||
14cf11af PM |
62 | /* |
63 | * Make sure the floating-point register state in the | |
64 | * the thread_struct is up to date for task tsk. | |
65 | */ | |
66 | void flush_fp_to_thread(struct task_struct *tsk) | |
67 | { | |
68 | if (tsk->thread.regs) { | |
69 | /* | |
70 | * We need to disable preemption here because if we didn't, | |
71 | * another process could get scheduled after the regs->msr | |
72 | * test but before we have finished saving the FP registers | |
73 | * to the thread_struct. That process could take over the | |
74 | * FPU, and then when we get scheduled again we would store | |
75 | * bogus values for the remaining FP registers. | |
76 | */ | |
77 | preempt_disable(); | |
78 | if (tsk->thread.regs->msr & MSR_FP) { | |
79 | #ifdef CONFIG_SMP | |
80 | /* | |
81 | * This should only ever be called for current or | |
82 | * for a stopped child process. Since we save away | |
83 | * the FP register state on context switch on SMP, | |
84 | * there is something wrong if a stopped child appears | |
85 | * to still have its FP state in the CPU registers. | |
86 | */ | |
87 | BUG_ON(tsk != current); | |
88 | #endif | |
0ee6c15e | 89 | giveup_fpu(tsk); |
14cf11af PM |
90 | } |
91 | preempt_enable(); | |
92 | } | |
93 | } | |
94 | ||
95 | void enable_kernel_fp(void) | |
96 | { | |
97 | WARN_ON(preemptible()); | |
98 | ||
99 | #ifdef CONFIG_SMP | |
100 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) | |
101 | giveup_fpu(current); | |
102 | else | |
103 | giveup_fpu(NULL); /* just enables FP for kernel */ | |
104 | #else | |
105 | giveup_fpu(last_task_used_math); | |
106 | #endif /* CONFIG_SMP */ | |
107 | } | |
108 | EXPORT_SYMBOL(enable_kernel_fp); | |
109 | ||
14cf11af PM |
110 | #ifdef CONFIG_ALTIVEC |
111 | void enable_kernel_altivec(void) | |
112 | { | |
113 | WARN_ON(preemptible()); | |
114 | ||
115 | #ifdef CONFIG_SMP | |
116 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) | |
117 | giveup_altivec(current); | |
118 | else | |
119 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ | |
120 | #else | |
121 | giveup_altivec(last_task_used_altivec); | |
122 | #endif /* CONFIG_SMP */ | |
123 | } | |
124 | EXPORT_SYMBOL(enable_kernel_altivec); | |
125 | ||
126 | /* | |
127 | * Make sure the VMX/Altivec register state in the | |
128 | * the thread_struct is up to date for task tsk. | |
129 | */ | |
130 | void flush_altivec_to_thread(struct task_struct *tsk) | |
131 | { | |
132 | if (tsk->thread.regs) { | |
133 | preempt_disable(); | |
134 | if (tsk->thread.regs->msr & MSR_VEC) { | |
135 | #ifdef CONFIG_SMP | |
136 | BUG_ON(tsk != current); | |
137 | #endif | |
0ee6c15e | 138 | giveup_altivec(tsk); |
14cf11af PM |
139 | } |
140 | preempt_enable(); | |
141 | } | |
142 | } | |
14cf11af PM |
143 | #endif /* CONFIG_ALTIVEC */ |
144 | ||
ce48b210 MN |
145 | #ifdef CONFIG_VSX |
146 | #if 0 | |
147 | /* not currently used, but some crazy RAID module might want to later */ | |
148 | void enable_kernel_vsx(void) | |
149 | { | |
150 | WARN_ON(preemptible()); | |
151 | ||
152 | #ifdef CONFIG_SMP | |
153 | if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) | |
154 | giveup_vsx(current); | |
155 | else | |
156 | giveup_vsx(NULL); /* just enable vsx for kernel - force */ | |
157 | #else | |
158 | giveup_vsx(last_task_used_vsx); | |
159 | #endif /* CONFIG_SMP */ | |
160 | } | |
161 | EXPORT_SYMBOL(enable_kernel_vsx); | |
162 | #endif | |
163 | ||
7c292170 MN |
164 | void giveup_vsx(struct task_struct *tsk) |
165 | { | |
166 | giveup_fpu(tsk); | |
167 | giveup_altivec(tsk); | |
168 | __giveup_vsx(tsk); | |
169 | } | |
170 | ||
ce48b210 MN |
171 | void flush_vsx_to_thread(struct task_struct *tsk) |
172 | { | |
173 | if (tsk->thread.regs) { | |
174 | preempt_disable(); | |
175 | if (tsk->thread.regs->msr & MSR_VSX) { | |
176 | #ifdef CONFIG_SMP | |
177 | BUG_ON(tsk != current); | |
178 | #endif | |
179 | giveup_vsx(tsk); | |
180 | } | |
181 | preempt_enable(); | |
182 | } | |
183 | } | |
ce48b210 MN |
184 | #endif /* CONFIG_VSX */ |
185 | ||
14cf11af PM |
186 | #ifdef CONFIG_SPE |
187 | ||
188 | void enable_kernel_spe(void) | |
189 | { | |
190 | WARN_ON(preemptible()); | |
191 | ||
192 | #ifdef CONFIG_SMP | |
193 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) | |
194 | giveup_spe(current); | |
195 | else | |
196 | giveup_spe(NULL); /* just enable SPE for kernel - force */ | |
197 | #else | |
198 | giveup_spe(last_task_used_spe); | |
199 | #endif /* __SMP __ */ | |
200 | } | |
201 | EXPORT_SYMBOL(enable_kernel_spe); | |
202 | ||
203 | void flush_spe_to_thread(struct task_struct *tsk) | |
204 | { | |
205 | if (tsk->thread.regs) { | |
206 | preempt_disable(); | |
207 | if (tsk->thread.regs->msr & MSR_SPE) { | |
208 | #ifdef CONFIG_SMP | |
209 | BUG_ON(tsk != current); | |
210 | #endif | |
0ee6c15e | 211 | giveup_spe(tsk); |
14cf11af PM |
212 | } |
213 | preempt_enable(); | |
214 | } | |
215 | } | |
14cf11af PM |
216 | #endif /* CONFIG_SPE */ |
217 | ||
5388fb10 | 218 | #ifndef CONFIG_SMP |
48abec07 PM |
219 | /* |
220 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), | |
221 | * and the current task has some state, discard it. | |
222 | */ | |
5388fb10 | 223 | void discard_lazy_cpu_state(void) |
48abec07 | 224 | { |
48abec07 PM |
225 | preempt_disable(); |
226 | if (last_task_used_math == current) | |
227 | last_task_used_math = NULL; | |
228 | #ifdef CONFIG_ALTIVEC | |
229 | if (last_task_used_altivec == current) | |
230 | last_task_used_altivec = NULL; | |
231 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
232 | #ifdef CONFIG_VSX |
233 | if (last_task_used_vsx == current) | |
234 | last_task_used_vsx = NULL; | |
235 | #endif /* CONFIG_VSX */ | |
48abec07 PM |
236 | #ifdef CONFIG_SPE |
237 | if (last_task_used_spe == current) | |
238 | last_task_used_spe = NULL; | |
239 | #endif | |
240 | preempt_enable(); | |
48abec07 | 241 | } |
5388fb10 | 242 | #endif /* CONFIG_SMP */ |
48abec07 | 243 | |
d6a61bfc LM |
244 | void do_dabr(struct pt_regs *regs, unsigned long address, |
245 | unsigned long error_code) | |
246 | { | |
247 | siginfo_t info; | |
248 | ||
249 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
250 | 11, SIGSEGV) == NOTIFY_STOP) | |
251 | return; | |
252 | ||
253 | if (debugger_dabr_match(regs)) | |
254 | return; | |
255 | ||
256 | /* Clear the DAC and struct entries. One shot trigger */ | |
2325f0a0 | 257 | #if defined(CONFIG_BOOKE) |
d6a61bfc LM |
258 | mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~(DBSR_DAC1R | DBSR_DAC1W |
259 | | DBCR0_IDM)); | |
260 | #endif | |
261 | ||
262 | /* Clear the DABR */ | |
263 | set_dabr(0); | |
264 | ||
265 | /* Deliver the signal to userspace */ | |
266 | info.si_signo = SIGTRAP; | |
267 | info.si_errno = 0; | |
268 | info.si_code = TRAP_HWBKPT; | |
269 | info.si_addr = (void __user *)address; | |
270 | force_sig_info(SIGTRAP, &info, current); | |
271 | } | |
272 | ||
a2ceff5e ME |
273 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
274 | ||
14cf11af PM |
275 | int set_dabr(unsigned long dabr) |
276 | { | |
a2ceff5e ME |
277 | __get_cpu_var(current_dabr) = dabr; |
278 | ||
cab0af98 ME |
279 | if (ppc_md.set_dabr) |
280 | return ppc_md.set_dabr(dabr); | |
14cf11af | 281 | |
791cc501 BH |
282 | /* XXX should we have a CPU_FTR_HAS_DABR ? */ |
283 | #if defined(CONFIG_PPC64) || defined(CONFIG_6xx) | |
cab0af98 | 284 | mtspr(SPRN_DABR, dabr); |
791cc501 | 285 | #endif |
d6a61bfc | 286 | |
2325f0a0 | 287 | #if defined(CONFIG_BOOKE) |
d6a61bfc LM |
288 | mtspr(SPRN_DAC1, dabr); |
289 | #endif | |
290 | ||
cab0af98 | 291 | return 0; |
14cf11af PM |
292 | } |
293 | ||
06d67d54 PM |
294 | #ifdef CONFIG_PPC64 |
295 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
06d67d54 | 296 | #endif |
14cf11af PM |
297 | |
298 | struct task_struct *__switch_to(struct task_struct *prev, | |
299 | struct task_struct *new) | |
300 | { | |
301 | struct thread_struct *new_thread, *old_thread; | |
302 | unsigned long flags; | |
303 | struct task_struct *last; | |
304 | ||
305 | #ifdef CONFIG_SMP | |
306 | /* avoid complexity of lazy save/restore of fpu | |
307 | * by just saving it every time we switch out if | |
308 | * this task used the fpu during the last quantum. | |
309 | * | |
310 | * If it tries to use the fpu again, it'll trap and | |
311 | * reload its fp regs. So we don't have to do a restore | |
312 | * every switch, just a save. | |
313 | * -- Cort | |
314 | */ | |
315 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) | |
316 | giveup_fpu(prev); | |
317 | #ifdef CONFIG_ALTIVEC | |
318 | /* | |
319 | * If the previous thread used altivec in the last quantum | |
320 | * (thus changing altivec regs) then save them. | |
321 | * We used to check the VRSAVE register but not all apps | |
322 | * set it, so we don't rely on it now (and in fact we need | |
323 | * to save & restore VSCR even if VRSAVE == 0). -- paulus | |
324 | * | |
325 | * On SMP we always save/restore altivec regs just to avoid the | |
326 | * complexity of changing processors. | |
327 | * -- Cort | |
328 | */ | |
329 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) | |
330 | giveup_altivec(prev); | |
14cf11af | 331 | #endif /* CONFIG_ALTIVEC */ |
ce48b210 MN |
332 | #ifdef CONFIG_VSX |
333 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VSX)) | |
7c292170 MN |
334 | /* VMX and FPU registers are already save here */ |
335 | __giveup_vsx(prev); | |
ce48b210 | 336 | #endif /* CONFIG_VSX */ |
14cf11af PM |
337 | #ifdef CONFIG_SPE |
338 | /* | |
339 | * If the previous thread used spe in the last quantum | |
340 | * (thus changing spe regs) then save them. | |
341 | * | |
342 | * On SMP we always save/restore spe regs just to avoid the | |
343 | * complexity of changing processors. | |
344 | */ | |
345 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) | |
346 | giveup_spe(prev); | |
c0c0d996 PM |
347 | #endif /* CONFIG_SPE */ |
348 | ||
349 | #else /* CONFIG_SMP */ | |
350 | #ifdef CONFIG_ALTIVEC | |
351 | /* Avoid the trap. On smp this this never happens since | |
352 | * we don't set last_task_used_altivec -- Cort | |
353 | */ | |
354 | if (new->thread.regs && last_task_used_altivec == new) | |
355 | new->thread.regs->msr |= MSR_VEC; | |
356 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
357 | #ifdef CONFIG_VSX |
358 | if (new->thread.regs && last_task_used_vsx == new) | |
359 | new->thread.regs->msr |= MSR_VSX; | |
360 | #endif /* CONFIG_VSX */ | |
c0c0d996 | 361 | #ifdef CONFIG_SPE |
14cf11af PM |
362 | /* Avoid the trap. On smp this this never happens since |
363 | * we don't set last_task_used_spe | |
364 | */ | |
365 | if (new->thread.regs && last_task_used_spe == new) | |
366 | new->thread.regs->msr |= MSR_SPE; | |
367 | #endif /* CONFIG_SPE */ | |
c0c0d996 | 368 | |
14cf11af PM |
369 | #endif /* CONFIG_SMP */ |
370 | ||
a2ceff5e | 371 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) |
14cf11af | 372 | set_dabr(new->thread.dabr); |
14cf11af | 373 | |
2325f0a0 | 374 | #if defined(CONFIG_BOOKE) |
d6a61bfc LM |
375 | /* If new thread DAC (HW breakpoint) is the same then leave it */ |
376 | if (new->thread.dabr) | |
377 | set_dabr(new->thread.dabr); | |
378 | #endif | |
379 | ||
14cf11af PM |
380 | new_thread = &new->thread; |
381 | old_thread = ¤t->thread; | |
06d67d54 PM |
382 | |
383 | #ifdef CONFIG_PPC64 | |
384 | /* | |
385 | * Collect processor utilization data per process | |
386 | */ | |
387 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
388 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); | |
389 | long unsigned start_tb, current_tb; | |
390 | start_tb = old_thread->start_tb; | |
391 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
392 | old_thread->accum_tb += (current_tb - start_tb); | |
393 | new_thread->start_tb = current_tb; | |
394 | } | |
395 | #endif | |
396 | ||
14cf11af | 397 | local_irq_save(flags); |
c6622f63 PM |
398 | |
399 | account_system_vtime(current); | |
81a3843f | 400 | account_process_vtime(current); |
c6622f63 PM |
401 | calculate_steal_time(); |
402 | ||
44387e9f AB |
403 | /* |
404 | * We can't take a PMU exception inside _switch() since there is a | |
405 | * window where the kernel stack SLB and the kernel stack are out | |
406 | * of sync. Hard disable here. | |
407 | */ | |
408 | hard_irq_disable(); | |
14cf11af PM |
409 | last = _switch(old_thread, new_thread); |
410 | ||
411 | local_irq_restore(flags); | |
412 | ||
413 | return last; | |
414 | } | |
415 | ||
06d67d54 PM |
416 | static int instructions_to_print = 16; |
417 | ||
06d67d54 PM |
418 | static void show_instructions(struct pt_regs *regs) |
419 | { | |
420 | int i; | |
421 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
422 | sizeof(int)); | |
423 | ||
424 | printk("Instruction dump:"); | |
425 | ||
426 | for (i = 0; i < instructions_to_print; i++) { | |
427 | int instr; | |
428 | ||
429 | if (!(i % 8)) | |
430 | printk("\n"); | |
431 | ||
0de2d820 SW |
432 | #if !defined(CONFIG_BOOKE) |
433 | /* If executing with the IMMU off, adjust pc rather | |
434 | * than print XXXXXXXX. | |
435 | */ | |
436 | if (!(regs->msr & MSR_IR)) | |
437 | pc = (unsigned long)phys_to_virt(pc); | |
438 | #endif | |
439 | ||
af308377 SR |
440 | /* We use __get_user here *only* to avoid an OOPS on a |
441 | * bad address because the pc *should* only be a | |
442 | * kernel address. | |
443 | */ | |
00ae36de AB |
444 | if (!__kernel_text_address(pc) || |
445 | __get_user(instr, (unsigned int __user *)pc)) { | |
06d67d54 PM |
446 | printk("XXXXXXXX "); |
447 | } else { | |
448 | if (regs->nip == pc) | |
449 | printk("<%08x> ", instr); | |
450 | else | |
451 | printk("%08x ", instr); | |
452 | } | |
453 | ||
454 | pc += sizeof(int); | |
455 | } | |
456 | ||
457 | printk("\n"); | |
458 | } | |
459 | ||
460 | static struct regbit { | |
461 | unsigned long bit; | |
462 | const char *name; | |
463 | } msr_bits[] = { | |
464 | {MSR_EE, "EE"}, | |
465 | {MSR_PR, "PR"}, | |
466 | {MSR_FP, "FP"}, | |
ce48b210 MN |
467 | {MSR_VEC, "VEC"}, |
468 | {MSR_VSX, "VSX"}, | |
06d67d54 | 469 | {MSR_ME, "ME"}, |
1b98326b KG |
470 | {MSR_CE, "CE"}, |
471 | {MSR_DE, "DE"}, | |
06d67d54 PM |
472 | {MSR_IR, "IR"}, |
473 | {MSR_DR, "DR"}, | |
474 | {0, NULL} | |
475 | }; | |
476 | ||
477 | static void printbits(unsigned long val, struct regbit *bits) | |
478 | { | |
479 | const char *sep = ""; | |
480 | ||
481 | printk("<"); | |
482 | for (; bits->bit; ++bits) | |
483 | if (val & bits->bit) { | |
484 | printk("%s%s", sep, bits->name); | |
485 | sep = ","; | |
486 | } | |
487 | printk(">"); | |
488 | } | |
489 | ||
490 | #ifdef CONFIG_PPC64 | |
f6f7dde3 | 491 | #define REG "%016lx" |
06d67d54 PM |
492 | #define REGS_PER_LINE 4 |
493 | #define LAST_VOLATILE 13 | |
494 | #else | |
f6f7dde3 | 495 | #define REG "%08lx" |
06d67d54 PM |
496 | #define REGS_PER_LINE 8 |
497 | #define LAST_VOLATILE 12 | |
498 | #endif | |
499 | ||
14cf11af PM |
500 | void show_regs(struct pt_regs * regs) |
501 | { | |
502 | int i, trap; | |
503 | ||
06d67d54 PM |
504 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
505 | regs->nip, regs->link, regs->ctr); | |
506 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
96b644bd | 507 | regs, regs->trap, print_tainted(), init_utsname()->release); |
06d67d54 PM |
508 | printk("MSR: "REG" ", regs->msr); |
509 | printbits(regs->msr, msr_bits); | |
f6f7dde3 | 510 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); |
14cf11af PM |
511 | trap = TRAP(regs); |
512 | if (trap == 0x300 || trap == 0x600) | |
14170789 KG |
513 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
514 | printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr); | |
515 | #else | |
06d67d54 | 516 | printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr); |
14170789 | 517 | #endif |
06d67d54 | 518 | printk("TASK = %p[%d] '%s' THREAD: %p", |
19c5870c | 519 | current, task_pid_nr(current), current->comm, task_thread_info(current)); |
14cf11af PM |
520 | |
521 | #ifdef CONFIG_SMP | |
79ccd1be | 522 | printk(" CPU: %d", raw_smp_processor_id()); |
14cf11af PM |
523 | #endif /* CONFIG_SMP */ |
524 | ||
525 | for (i = 0; i < 32; i++) { | |
06d67d54 | 526 | if ((i % REGS_PER_LINE) == 0) |
14cf11af | 527 | printk("\n" KERN_INFO "GPR%02d: ", i); |
06d67d54 PM |
528 | printk(REG " ", regs->gpr[i]); |
529 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
530 | break; |
531 | } | |
532 | printk("\n"); | |
533 | #ifdef CONFIG_KALLSYMS | |
534 | /* | |
535 | * Lookup NIP late so we have the best change of getting the | |
536 | * above info out without failing | |
537 | */ | |
058c78f4 BH |
538 | printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip); |
539 | printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link); | |
14cf11af PM |
540 | #endif |
541 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
542 | if (!user_mode(regs)) |
543 | show_instructions(regs); | |
14cf11af PM |
544 | } |
545 | ||
546 | void exit_thread(void) | |
547 | { | |
48abec07 | 548 | discard_lazy_cpu_state(); |
14cf11af PM |
549 | } |
550 | ||
551 | void flush_thread(void) | |
552 | { | |
06d67d54 PM |
553 | #ifdef CONFIG_PPC64 |
554 | struct thread_info *t = current_thread_info(); | |
555 | ||
f144e7c7 MD |
556 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
557 | clear_ti_thread_flag(t, TIF_ABI_PENDING); | |
558 | if (test_ti_thread_flag(t, TIF_32BIT)) | |
559 | clear_ti_thread_flag(t, TIF_32BIT); | |
560 | else | |
561 | set_ti_thread_flag(t, TIF_32BIT); | |
562 | } | |
06d67d54 | 563 | #endif |
06d67d54 | 564 | |
48abec07 | 565 | discard_lazy_cpu_state(); |
14cf11af | 566 | |
14cf11af PM |
567 | if (current->thread.dabr) { |
568 | current->thread.dabr = 0; | |
569 | set_dabr(0); | |
d6a61bfc | 570 | |
2325f0a0 | 571 | #if defined(CONFIG_BOOKE) |
d6a61bfc LM |
572 | current->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W); |
573 | #endif | |
14cf11af | 574 | } |
14cf11af PM |
575 | } |
576 | ||
577 | void | |
578 | release_thread(struct task_struct *t) | |
579 | { | |
580 | } | |
581 | ||
582 | /* | |
583 | * This gets called before we allocate a new thread and copy | |
584 | * the current task into it. | |
585 | */ | |
586 | void prepare_to_copy(struct task_struct *tsk) | |
587 | { | |
588 | flush_fp_to_thread(current); | |
589 | flush_altivec_to_thread(current); | |
ce48b210 | 590 | flush_vsx_to_thread(current); |
14cf11af PM |
591 | flush_spe_to_thread(current); |
592 | } | |
593 | ||
594 | /* | |
595 | * Copy a thread.. | |
596 | */ | |
06d67d54 PM |
597 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, |
598 | unsigned long unused, struct task_struct *p, | |
599 | struct pt_regs *regs) | |
14cf11af PM |
600 | { |
601 | struct pt_regs *childregs, *kregs; | |
602 | extern void ret_from_fork(void); | |
0cec6fd1 | 603 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
604 | |
605 | CHECK_FULL_REGS(regs); | |
606 | /* Copy registers */ | |
607 | sp -= sizeof(struct pt_regs); | |
608 | childregs = (struct pt_regs *) sp; | |
609 | *childregs = *regs; | |
610 | if ((childregs->msr & MSR_PR) == 0) { | |
611 | /* for kernel thread, set `current' and stackptr in new task */ | |
612 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 613 | #ifdef CONFIG_PPC32 |
14cf11af | 614 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 615 | #else |
b5e2fc1c | 616 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 617 | #endif |
14cf11af PM |
618 | p->thread.regs = NULL; /* no user register state */ |
619 | } else { | |
620 | childregs->gpr[1] = usp; | |
621 | p->thread.regs = childregs; | |
06d67d54 PM |
622 | if (clone_flags & CLONE_SETTLS) { |
623 | #ifdef CONFIG_PPC64 | |
624 | if (!test_thread_flag(TIF_32BIT)) | |
625 | childregs->gpr[13] = childregs->gpr[6]; | |
626 | else | |
627 | #endif | |
628 | childregs->gpr[2] = childregs->gpr[6]; | |
629 | } | |
14cf11af PM |
630 | } |
631 | childregs->gpr[3] = 0; /* Result from fork() */ | |
632 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
633 | |
634 | /* | |
635 | * The way this works is that at some point in the future | |
636 | * some task will call _switch to switch to the new task. | |
637 | * That will pop off the stack frame created below and start | |
638 | * the new task running at ret_from_fork. The new task will | |
639 | * do some house keeping and then return from the fork or clone | |
640 | * system call, using the stack frame created above. | |
641 | */ | |
642 | sp -= sizeof(struct pt_regs); | |
643 | kregs = (struct pt_regs *) sp; | |
644 | sp -= STACK_FRAME_OVERHEAD; | |
645 | p->thread.ksp = sp; | |
85218827 KG |
646 | p->thread.ksp_limit = (unsigned long)task_stack_page(p) + |
647 | _ALIGN_UP(sizeof(struct thread_info), 16); | |
14cf11af | 648 | |
06d67d54 PM |
649 | #ifdef CONFIG_PPC64 |
650 | if (cpu_has_feature(CPU_FTR_SLB)) { | |
1189be65 | 651 | unsigned long sp_vsid; |
3c726f8d | 652 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 | 653 | |
1189be65 PM |
654 | if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) |
655 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) | |
656 | << SLB_VSID_SHIFT_1T; | |
657 | else | |
658 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) | |
659 | << SLB_VSID_SHIFT; | |
3c726f8d | 660 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
661 | p->thread.ksp_vsid = sp_vsid; |
662 | } | |
663 | ||
664 | /* | |
665 | * The PPC64 ABI makes use of a TOC to contain function | |
666 | * pointers. The function (ret_from_except) is actually a pointer | |
667 | * to the TOC entry. The first entry is a pointer to the actual | |
668 | * function. | |
669 | */ | |
670 | kregs->nip = *((unsigned long *)ret_from_fork); | |
671 | #else | |
672 | kregs->nip = (unsigned long)ret_from_fork; | |
06d67d54 | 673 | #endif |
14cf11af PM |
674 | |
675 | return 0; | |
676 | } | |
677 | ||
678 | /* | |
679 | * Set up a thread for executing a new program | |
680 | */ | |
06d67d54 | 681 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 682 | { |
90eac727 ME |
683 | #ifdef CONFIG_PPC64 |
684 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
685 | #endif | |
686 | ||
14cf11af | 687 | set_fs(USER_DS); |
06d67d54 PM |
688 | |
689 | /* | |
690 | * If we exec out of a kernel thread then thread.regs will not be | |
691 | * set. Do it now. | |
692 | */ | |
693 | if (!current->thread.regs) { | |
0cec6fd1 AV |
694 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
695 | current->thread.regs = regs - 1; | |
06d67d54 PM |
696 | } |
697 | ||
14cf11af PM |
698 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
699 | regs->ctr = 0; | |
700 | regs->link = 0; | |
701 | regs->xer = 0; | |
702 | regs->ccr = 0; | |
14cf11af | 703 | regs->gpr[1] = sp; |
06d67d54 | 704 | |
474f8196 RM |
705 | /* |
706 | * We have just cleared all the nonvolatile GPRs, so make | |
707 | * FULL_REGS(regs) return true. This is necessary to allow | |
708 | * ptrace to examine the thread immediately after exec. | |
709 | */ | |
710 | regs->trap &= ~1UL; | |
711 | ||
06d67d54 PM |
712 | #ifdef CONFIG_PPC32 |
713 | regs->mq = 0; | |
714 | regs->nip = start; | |
14cf11af | 715 | regs->msr = MSR_USER; |
06d67d54 | 716 | #else |
d4bf9a78 | 717 | if (!test_thread_flag(TIF_32BIT)) { |
90eac727 | 718 | unsigned long entry, toc; |
06d67d54 PM |
719 | |
720 | /* start is a relocated pointer to the function descriptor for | |
721 | * the elf _start routine. The first entry in the function | |
722 | * descriptor is the entry address of _start and the second | |
723 | * entry is the TOC value we need to use. | |
724 | */ | |
725 | __get_user(entry, (unsigned long __user *)start); | |
726 | __get_user(toc, (unsigned long __user *)start+1); | |
727 | ||
728 | /* Check whether the e_entry function descriptor entries | |
729 | * need to be relocated before we can use them. | |
730 | */ | |
731 | if (load_addr != 0) { | |
732 | entry += load_addr; | |
733 | toc += load_addr; | |
734 | } | |
735 | regs->nip = entry; | |
736 | regs->gpr[2] = toc; | |
737 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
738 | } else { |
739 | regs->nip = start; | |
740 | regs->gpr[2] = 0; | |
741 | regs->msr = MSR_USER32; | |
06d67d54 PM |
742 | } |
743 | #endif | |
744 | ||
48abec07 | 745 | discard_lazy_cpu_state(); |
ce48b210 MN |
746 | #ifdef CONFIG_VSX |
747 | current->thread.used_vsr = 0; | |
748 | #endif | |
14cf11af | 749 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 750 | current->thread.fpscr.val = 0; |
14cf11af PM |
751 | #ifdef CONFIG_ALTIVEC |
752 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
753 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 754 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
755 | current->thread.vrsave = 0; |
756 | current->thread.used_vr = 0; | |
757 | #endif /* CONFIG_ALTIVEC */ | |
758 | #ifdef CONFIG_SPE | |
759 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
760 | current->thread.acc = 0; | |
761 | current->thread.spefscr = 0; | |
762 | current->thread.used_spe = 0; | |
763 | #endif /* CONFIG_SPE */ | |
764 | } | |
765 | ||
766 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
767 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
768 | ||
769 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
770 | { | |
771 | struct pt_regs *regs = tsk->thread.regs; | |
772 | ||
773 | /* This is a bit hairy. If we are an SPE enabled processor | |
774 | * (have embedded fp) we store the IEEE exception enable flags in | |
775 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
776 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
777 | if (val & PR_FP_EXC_SW_ENABLE) { | |
778 | #ifdef CONFIG_SPE | |
5e14d21e KG |
779 | if (cpu_has_feature(CPU_FTR_SPE)) { |
780 | tsk->thread.fpexc_mode = val & | |
781 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
782 | return 0; | |
783 | } else { | |
784 | return -EINVAL; | |
785 | } | |
14cf11af PM |
786 | #else |
787 | return -EINVAL; | |
788 | #endif | |
14cf11af | 789 | } |
06d67d54 PM |
790 | |
791 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
792 | * __pack_fe01 use do not overlap with bits used for | |
793 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
794 | * on CONFIG_SPE implementations are reserved so writing to | |
795 | * them does not change anything */ | |
796 | if (val > PR_FP_EXC_PRECISE) | |
797 | return -EINVAL; | |
798 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
799 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
800 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
801 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
802 | return 0; |
803 | } | |
804 | ||
805 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
806 | { | |
807 | unsigned int val; | |
808 | ||
809 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
810 | #ifdef CONFIG_SPE | |
5e14d21e KG |
811 | if (cpu_has_feature(CPU_FTR_SPE)) |
812 | val = tsk->thread.fpexc_mode; | |
813 | else | |
814 | return -EINVAL; | |
14cf11af PM |
815 | #else |
816 | return -EINVAL; | |
817 | #endif | |
818 | else | |
819 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
820 | return put_user(val, (unsigned int __user *) adr); | |
821 | } | |
822 | ||
fab5db97 PM |
823 | int set_endian(struct task_struct *tsk, unsigned int val) |
824 | { | |
825 | struct pt_regs *regs = tsk->thread.regs; | |
826 | ||
827 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
828 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
829 | return -EINVAL; | |
830 | ||
831 | if (regs == NULL) | |
832 | return -EINVAL; | |
833 | ||
834 | if (val == PR_ENDIAN_BIG) | |
835 | regs->msr &= ~MSR_LE; | |
836 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
837 | regs->msr |= MSR_LE; | |
838 | else | |
839 | return -EINVAL; | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
845 | { | |
846 | struct pt_regs *regs = tsk->thread.regs; | |
847 | unsigned int val; | |
848 | ||
849 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
850 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
851 | return -EINVAL; | |
852 | ||
853 | if (regs == NULL) | |
854 | return -EINVAL; | |
855 | ||
856 | if (regs->msr & MSR_LE) { | |
857 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
858 | val = PR_ENDIAN_LITTLE; | |
859 | else | |
860 | val = PR_ENDIAN_PPC_LITTLE; | |
861 | } else | |
862 | val = PR_ENDIAN_BIG; | |
863 | ||
864 | return put_user(val, (unsigned int __user *)adr); | |
865 | } | |
866 | ||
e9370ae1 PM |
867 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
868 | { | |
869 | tsk->thread.align_ctl = val; | |
870 | return 0; | |
871 | } | |
872 | ||
873 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
874 | { | |
875 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
876 | } | |
877 | ||
06d67d54 PM |
878 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
879 | ||
14cf11af PM |
880 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
881 | int __user *parent_tidp, void __user *child_threadptr, | |
882 | int __user *child_tidp, int p6, | |
883 | struct pt_regs *regs) | |
884 | { | |
885 | CHECK_FULL_REGS(regs); | |
886 | if (usp == 0) | |
887 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 PM |
888 | #ifdef CONFIG_PPC64 |
889 | if (test_thread_flag(TIF_32BIT)) { | |
890 | parent_tidp = TRUNC_PTR(parent_tidp); | |
891 | child_tidp = TRUNC_PTR(child_tidp); | |
892 | } | |
893 | #endif | |
14cf11af PM |
894 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
895 | } | |
896 | ||
897 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
898 | unsigned long p4, unsigned long p5, unsigned long p6, | |
899 | struct pt_regs *regs) | |
900 | { | |
901 | CHECK_FULL_REGS(regs); | |
902 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
903 | } | |
904 | ||
905 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
906 | unsigned long p4, unsigned long p5, unsigned long p6, | |
907 | struct pt_regs *regs) | |
908 | { | |
909 | CHECK_FULL_REGS(regs); | |
910 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
911 | regs, 0, NULL, NULL); | |
912 | } | |
913 | ||
914 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
915 | unsigned long a3, unsigned long a4, unsigned long a5, | |
916 | struct pt_regs *regs) | |
917 | { | |
918 | int error; | |
06d67d54 | 919 | char *filename; |
14cf11af PM |
920 | |
921 | filename = getname((char __user *) a0); | |
922 | error = PTR_ERR(filename); | |
923 | if (IS_ERR(filename)) | |
924 | goto out; | |
925 | flush_fp_to_thread(current); | |
926 | flush_altivec_to_thread(current); | |
927 | flush_spe_to_thread(current); | |
20c8c210 PM |
928 | error = do_execve(filename, (char __user * __user *) a1, |
929 | (char __user * __user *) a2, regs); | |
14cf11af PM |
930 | putname(filename); |
931 | out: | |
932 | return error; | |
933 | } | |
934 | ||
bb72c481 PM |
935 | #ifdef CONFIG_IRQSTACKS |
936 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, | |
937 | unsigned long nbytes) | |
938 | { | |
939 | unsigned long stack_page; | |
940 | unsigned long cpu = task_cpu(p); | |
941 | ||
942 | /* | |
943 | * Avoid crashing if the stack has overflowed and corrupted | |
944 | * task_cpu(p), which is in the thread_info struct. | |
945 | */ | |
946 | if (cpu < NR_CPUS && cpu_possible(cpu)) { | |
947 | stack_page = (unsigned long) hardirq_ctx[cpu]; | |
948 | if (sp >= stack_page + sizeof(struct thread_struct) | |
949 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
950 | return 1; | |
951 | ||
952 | stack_page = (unsigned long) softirq_ctx[cpu]; | |
953 | if (sp >= stack_page + sizeof(struct thread_struct) | |
954 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
955 | return 1; | |
956 | } | |
957 | return 0; | |
958 | } | |
959 | ||
960 | #else | |
961 | #define valid_irq_stack(sp, p, nb) 0 | |
962 | #endif /* CONFIG_IRQSTACKS */ | |
963 | ||
2f25194d | 964 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
965 | unsigned long nbytes) |
966 | { | |
0cec6fd1 | 967 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
968 | |
969 | if (sp >= stack_page + sizeof(struct thread_struct) | |
970 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
971 | return 1; | |
972 | ||
bb72c481 | 973 | return valid_irq_stack(sp, p, nbytes); |
14cf11af PM |
974 | } |
975 | ||
2f25194d AB |
976 | EXPORT_SYMBOL(validate_sp); |
977 | ||
14cf11af PM |
978 | unsigned long get_wchan(struct task_struct *p) |
979 | { | |
980 | unsigned long ip, sp; | |
981 | int count = 0; | |
982 | ||
983 | if (!p || p == current || p->state == TASK_RUNNING) | |
984 | return 0; | |
985 | ||
986 | sp = p->thread.ksp; | |
ec2b36b9 | 987 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
988 | return 0; |
989 | ||
990 | do { | |
991 | sp = *(unsigned long *)sp; | |
ec2b36b9 | 992 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
993 | return 0; |
994 | if (count > 0) { | |
ec2b36b9 | 995 | ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE]; |
14cf11af PM |
996 | if (!in_sched_functions(ip)) |
997 | return ip; | |
998 | } | |
999 | } while (count++ < 16); | |
1000 | return 0; | |
1001 | } | |
06d67d54 PM |
1002 | |
1003 | static int kstack_depth_to_print = 64; | |
1004 | ||
1005 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
1006 | { | |
1007 | unsigned long sp, ip, lr, newsp; | |
1008 | int count = 0; | |
1009 | int firstframe = 1; | |
1010 | ||
1011 | sp = (unsigned long) stack; | |
1012 | if (tsk == NULL) | |
1013 | tsk = current; | |
1014 | if (sp == 0) { | |
1015 | if (tsk == current) | |
1016 | asm("mr %0,1" : "=r" (sp)); | |
1017 | else | |
1018 | sp = tsk->thread.ksp; | |
1019 | } | |
1020 | ||
1021 | lr = 0; | |
1022 | printk("Call Trace:\n"); | |
1023 | do { | |
ec2b36b9 | 1024 | if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) |
06d67d54 PM |
1025 | return; |
1026 | ||
1027 | stack = (unsigned long *) sp; | |
1028 | newsp = stack[0]; | |
ec2b36b9 | 1029 | ip = stack[STACK_FRAME_LR_SAVE]; |
06d67d54 | 1030 | if (!firstframe || ip != lr) { |
058c78f4 | 1031 | printk("["REG"] ["REG"] %pS", sp, ip, (void *)ip); |
06d67d54 PM |
1032 | if (firstframe) |
1033 | printk(" (unreliable)"); | |
1034 | printk("\n"); | |
1035 | } | |
1036 | firstframe = 0; | |
1037 | ||
1038 | /* | |
1039 | * See if this is an exception frame. | |
1040 | * We look for the "regshere" marker in the current frame. | |
1041 | */ | |
ec2b36b9 BH |
1042 | if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) |
1043 | && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { | |
06d67d54 PM |
1044 | struct pt_regs *regs = (struct pt_regs *) |
1045 | (sp + STACK_FRAME_OVERHEAD); | |
06d67d54 | 1046 | lr = regs->link; |
058c78f4 BH |
1047 | printk("--- Exception: %lx at %pS\n LR = %pS\n", |
1048 | regs->trap, (void *)regs->nip, (void *)lr); | |
06d67d54 PM |
1049 | firstframe = 1; |
1050 | } | |
1051 | ||
1052 | sp = newsp; | |
1053 | } while (count++ < kstack_depth_to_print); | |
1054 | } | |
1055 | ||
1056 | void dump_stack(void) | |
1057 | { | |
1058 | show_stack(current, NULL); | |
1059 | } | |
1060 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
1061 | |
1062 | #ifdef CONFIG_PPC64 | |
1063 | void ppc64_runlatch_on(void) | |
1064 | { | |
1065 | unsigned long ctrl; | |
1066 | ||
1067 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
1068 | HMT_medium(); | |
1069 | ||
1070 | ctrl = mfspr(SPRN_CTRLF); | |
1071 | ctrl |= CTRL_RUNLATCH; | |
1072 | mtspr(SPRN_CTRLT, ctrl); | |
1073 | ||
1074 | set_thread_flag(TIF_RUNLATCH); | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | void ppc64_runlatch_off(void) | |
1079 | { | |
1080 | unsigned long ctrl; | |
1081 | ||
1082 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { | |
1083 | HMT_medium(); | |
1084 | ||
1085 | clear_thread_flag(TIF_RUNLATCH); | |
1086 | ||
1087 | ctrl = mfspr(SPRN_CTRLF); | |
1088 | ctrl &= ~CTRL_RUNLATCH; | |
1089 | mtspr(SPRN_CTRLT, ctrl); | |
1090 | } | |
1091 | } | |
1092 | #endif | |
f6a61680 BH |
1093 | |
1094 | #if THREAD_SHIFT < PAGE_SHIFT | |
1095 | ||
1096 | static struct kmem_cache *thread_info_cache; | |
1097 | ||
1098 | struct thread_info *alloc_thread_info(struct task_struct *tsk) | |
1099 | { | |
1100 | struct thread_info *ti; | |
1101 | ||
1102 | ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL); | |
1103 | if (unlikely(ti == NULL)) | |
1104 | return NULL; | |
1105 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
1106 | memset(ti, 0, THREAD_SIZE); | |
1107 | #endif | |
1108 | return ti; | |
1109 | } | |
1110 | ||
1111 | void free_thread_info(struct thread_info *ti) | |
1112 | { | |
1113 | kmem_cache_free(thread_info_cache, ti); | |
1114 | } | |
1115 | ||
1116 | void thread_info_cache_init(void) | |
1117 | { | |
1118 | thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, | |
1119 | THREAD_SIZE, 0, NULL); | |
1120 | BUG_ON(thread_info_cache == NULL); | |
1121 | } | |
1122 | ||
1123 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ |