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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> |
6794c782 | 36 | #include <linux/ftrace.h> |
79741dd3 | 37 | #include <linux/kernel_stat.h> |
d839088c AB |
38 | #include <linux/personality.h> |
39 | #include <linux/random.h> | |
5aae8a53 | 40 | #include <linux/hw_breakpoint.h> |
14cf11af PM |
41 | |
42 | #include <asm/pgtable.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/system.h> | |
45 | #include <asm/io.h> | |
46 | #include <asm/processor.h> | |
47 | #include <asm/mmu.h> | |
48 | #include <asm/prom.h> | |
76032de8 | 49 | #include <asm/machdep.h> |
c6622f63 | 50 | #include <asm/time.h> |
a7f31841 | 51 | #include <asm/syscalls.h> |
06d67d54 PM |
52 | #ifdef CONFIG_PPC64 |
53 | #include <asm/firmware.h> | |
06d67d54 | 54 | #endif |
d6a61bfc LM |
55 | #include <linux/kprobes.h> |
56 | #include <linux/kdebug.h> | |
14cf11af PM |
57 | |
58 | extern unsigned long _get_SP(void); | |
59 | ||
60 | #ifndef CONFIG_SMP | |
61 | struct task_struct *last_task_used_math = NULL; | |
62 | struct task_struct *last_task_used_altivec = NULL; | |
ce48b210 | 63 | struct task_struct *last_task_used_vsx = NULL; |
14cf11af PM |
64 | struct task_struct *last_task_used_spe = NULL; |
65 | #endif | |
66 | ||
14cf11af PM |
67 | /* |
68 | * Make sure the floating-point register state in the | |
69 | * the thread_struct is up to date for task tsk. | |
70 | */ | |
71 | void flush_fp_to_thread(struct task_struct *tsk) | |
72 | { | |
73 | if (tsk->thread.regs) { | |
74 | /* | |
75 | * We need to disable preemption here because if we didn't, | |
76 | * another process could get scheduled after the regs->msr | |
77 | * test but before we have finished saving the FP registers | |
78 | * to the thread_struct. That process could take over the | |
79 | * FPU, and then when we get scheduled again we would store | |
80 | * bogus values for the remaining FP registers. | |
81 | */ | |
82 | preempt_disable(); | |
83 | if (tsk->thread.regs->msr & MSR_FP) { | |
84 | #ifdef CONFIG_SMP | |
85 | /* | |
86 | * This should only ever be called for current or | |
87 | * for a stopped child process. Since we save away | |
88 | * the FP register state on context switch on SMP, | |
89 | * there is something wrong if a stopped child appears | |
90 | * to still have its FP state in the CPU registers. | |
91 | */ | |
92 | BUG_ON(tsk != current); | |
93 | #endif | |
0ee6c15e | 94 | giveup_fpu(tsk); |
14cf11af PM |
95 | } |
96 | preempt_enable(); | |
97 | } | |
98 | } | |
99 | ||
100 | void enable_kernel_fp(void) | |
101 | { | |
102 | WARN_ON(preemptible()); | |
103 | ||
104 | #ifdef CONFIG_SMP | |
105 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) | |
106 | giveup_fpu(current); | |
107 | else | |
108 | giveup_fpu(NULL); /* just enables FP for kernel */ | |
109 | #else | |
110 | giveup_fpu(last_task_used_math); | |
111 | #endif /* CONFIG_SMP */ | |
112 | } | |
113 | EXPORT_SYMBOL(enable_kernel_fp); | |
114 | ||
14cf11af PM |
115 | #ifdef CONFIG_ALTIVEC |
116 | void enable_kernel_altivec(void) | |
117 | { | |
118 | WARN_ON(preemptible()); | |
119 | ||
120 | #ifdef CONFIG_SMP | |
121 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) | |
122 | giveup_altivec(current); | |
123 | else | |
124 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ | |
125 | #else | |
126 | giveup_altivec(last_task_used_altivec); | |
127 | #endif /* CONFIG_SMP */ | |
128 | } | |
129 | EXPORT_SYMBOL(enable_kernel_altivec); | |
130 | ||
131 | /* | |
132 | * Make sure the VMX/Altivec register state in the | |
133 | * the thread_struct is up to date for task tsk. | |
134 | */ | |
135 | void flush_altivec_to_thread(struct task_struct *tsk) | |
136 | { | |
137 | if (tsk->thread.regs) { | |
138 | preempt_disable(); | |
139 | if (tsk->thread.regs->msr & MSR_VEC) { | |
140 | #ifdef CONFIG_SMP | |
141 | BUG_ON(tsk != current); | |
142 | #endif | |
0ee6c15e | 143 | giveup_altivec(tsk); |
14cf11af PM |
144 | } |
145 | preempt_enable(); | |
146 | } | |
147 | } | |
14cf11af PM |
148 | #endif /* CONFIG_ALTIVEC */ |
149 | ||
ce48b210 MN |
150 | #ifdef CONFIG_VSX |
151 | #if 0 | |
152 | /* not currently used, but some crazy RAID module might want to later */ | |
153 | void enable_kernel_vsx(void) | |
154 | { | |
155 | WARN_ON(preemptible()); | |
156 | ||
157 | #ifdef CONFIG_SMP | |
158 | if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) | |
159 | giveup_vsx(current); | |
160 | else | |
161 | giveup_vsx(NULL); /* just enable vsx for kernel - force */ | |
162 | #else | |
163 | giveup_vsx(last_task_used_vsx); | |
164 | #endif /* CONFIG_SMP */ | |
165 | } | |
166 | EXPORT_SYMBOL(enable_kernel_vsx); | |
167 | #endif | |
168 | ||
7c292170 MN |
169 | void giveup_vsx(struct task_struct *tsk) |
170 | { | |
171 | giveup_fpu(tsk); | |
172 | giveup_altivec(tsk); | |
173 | __giveup_vsx(tsk); | |
174 | } | |
175 | ||
ce48b210 MN |
176 | void flush_vsx_to_thread(struct task_struct *tsk) |
177 | { | |
178 | if (tsk->thread.regs) { | |
179 | preempt_disable(); | |
180 | if (tsk->thread.regs->msr & MSR_VSX) { | |
181 | #ifdef CONFIG_SMP | |
182 | BUG_ON(tsk != current); | |
183 | #endif | |
184 | giveup_vsx(tsk); | |
185 | } | |
186 | preempt_enable(); | |
187 | } | |
188 | } | |
ce48b210 MN |
189 | #endif /* CONFIG_VSX */ |
190 | ||
14cf11af PM |
191 | #ifdef CONFIG_SPE |
192 | ||
193 | void enable_kernel_spe(void) | |
194 | { | |
195 | WARN_ON(preemptible()); | |
196 | ||
197 | #ifdef CONFIG_SMP | |
198 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) | |
199 | giveup_spe(current); | |
200 | else | |
201 | giveup_spe(NULL); /* just enable SPE for kernel - force */ | |
202 | #else | |
203 | giveup_spe(last_task_used_spe); | |
204 | #endif /* __SMP __ */ | |
205 | } | |
206 | EXPORT_SYMBOL(enable_kernel_spe); | |
207 | ||
208 | void flush_spe_to_thread(struct task_struct *tsk) | |
209 | { | |
210 | if (tsk->thread.regs) { | |
211 | preempt_disable(); | |
212 | if (tsk->thread.regs->msr & MSR_SPE) { | |
213 | #ifdef CONFIG_SMP | |
214 | BUG_ON(tsk != current); | |
215 | #endif | |
0ee6c15e | 216 | giveup_spe(tsk); |
14cf11af PM |
217 | } |
218 | preempt_enable(); | |
219 | } | |
220 | } | |
14cf11af PM |
221 | #endif /* CONFIG_SPE */ |
222 | ||
5388fb10 | 223 | #ifndef CONFIG_SMP |
48abec07 PM |
224 | /* |
225 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), | |
226 | * and the current task has some state, discard it. | |
227 | */ | |
5388fb10 | 228 | void discard_lazy_cpu_state(void) |
48abec07 | 229 | { |
48abec07 PM |
230 | preempt_disable(); |
231 | if (last_task_used_math == current) | |
232 | last_task_used_math = NULL; | |
233 | #ifdef CONFIG_ALTIVEC | |
234 | if (last_task_used_altivec == current) | |
235 | last_task_used_altivec = NULL; | |
236 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
237 | #ifdef CONFIG_VSX |
238 | if (last_task_used_vsx == current) | |
239 | last_task_used_vsx = NULL; | |
240 | #endif /* CONFIG_VSX */ | |
48abec07 PM |
241 | #ifdef CONFIG_SPE |
242 | if (last_task_used_spe == current) | |
243 | last_task_used_spe = NULL; | |
244 | #endif | |
245 | preempt_enable(); | |
48abec07 | 246 | } |
5388fb10 | 247 | #endif /* CONFIG_SMP */ |
48abec07 | 248 | |
3bffb652 DK |
249 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
250 | void do_send_trap(struct pt_regs *regs, unsigned long address, | |
251 | unsigned long error_code, int signal_code, int breakpt) | |
252 | { | |
253 | siginfo_t info; | |
254 | ||
255 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
256 | 11, SIGSEGV) == NOTIFY_STOP) | |
257 | return; | |
258 | ||
259 | /* Deliver the signal to userspace */ | |
260 | info.si_signo = SIGTRAP; | |
261 | info.si_errno = breakpt; /* breakpoint or watchpoint id */ | |
262 | info.si_code = signal_code; | |
263 | info.si_addr = (void __user *)address; | |
264 | force_sig_info(SIGTRAP, &info, current); | |
265 | } | |
266 | #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ | |
d6a61bfc LM |
267 | void do_dabr(struct pt_regs *regs, unsigned long address, |
268 | unsigned long error_code) | |
269 | { | |
270 | siginfo_t info; | |
271 | ||
272 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
273 | 11, SIGSEGV) == NOTIFY_STOP) | |
274 | return; | |
275 | ||
276 | if (debugger_dabr_match(regs)) | |
277 | return; | |
278 | ||
d6a61bfc LM |
279 | /* Clear the DABR */ |
280 | set_dabr(0); | |
281 | ||
282 | /* Deliver the signal to userspace */ | |
283 | info.si_signo = SIGTRAP; | |
284 | info.si_errno = 0; | |
285 | info.si_code = TRAP_HWBKPT; | |
286 | info.si_addr = (void __user *)address; | |
287 | force_sig_info(SIGTRAP, &info, current); | |
288 | } | |
3bffb652 | 289 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ |
d6a61bfc | 290 | |
a2ceff5e ME |
291 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
292 | ||
3bffb652 DK |
293 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
294 | /* | |
295 | * Set the debug registers back to their default "safe" values. | |
296 | */ | |
297 | static void set_debug_reg_defaults(struct thread_struct *thread) | |
298 | { | |
299 | thread->iac1 = thread->iac2 = 0; | |
300 | #if CONFIG_PPC_ADV_DEBUG_IACS > 2 | |
301 | thread->iac3 = thread->iac4 = 0; | |
302 | #endif | |
303 | thread->dac1 = thread->dac2 = 0; | |
304 | #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 | |
305 | thread->dvc1 = thread->dvc2 = 0; | |
306 | #endif | |
307 | thread->dbcr0 = 0; | |
308 | #ifdef CONFIG_BOOKE | |
309 | /* | |
310 | * Force User/Supervisor bits to b11 (user-only MSR[PR]=1) | |
311 | */ | |
312 | thread->dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | \ | |
313 | DBCR1_IAC3US | DBCR1_IAC4US; | |
314 | /* | |
315 | * Force Data Address Compare User/Supervisor bits to be User-only | |
316 | * (0b11 MSR[PR]=1) and set all other bits in DBCR2 register to be 0. | |
317 | */ | |
318 | thread->dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US; | |
319 | #else | |
320 | thread->dbcr1 = 0; | |
321 | #endif | |
322 | } | |
323 | ||
324 | static void prime_debug_regs(struct thread_struct *thread) | |
325 | { | |
326 | mtspr(SPRN_IAC1, thread->iac1); | |
327 | mtspr(SPRN_IAC2, thread->iac2); | |
328 | #if CONFIG_PPC_ADV_DEBUG_IACS > 2 | |
329 | mtspr(SPRN_IAC3, thread->iac3); | |
330 | mtspr(SPRN_IAC4, thread->iac4); | |
331 | #endif | |
332 | mtspr(SPRN_DAC1, thread->dac1); | |
333 | mtspr(SPRN_DAC2, thread->dac2); | |
334 | #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 | |
335 | mtspr(SPRN_DVC1, thread->dvc1); | |
336 | mtspr(SPRN_DVC2, thread->dvc2); | |
337 | #endif | |
338 | mtspr(SPRN_DBCR0, thread->dbcr0); | |
339 | mtspr(SPRN_DBCR1, thread->dbcr1); | |
340 | #ifdef CONFIG_BOOKE | |
341 | mtspr(SPRN_DBCR2, thread->dbcr2); | |
342 | #endif | |
343 | } | |
344 | /* | |
345 | * Unless neither the old or new thread are making use of the | |
346 | * debug registers, set the debug registers from the values | |
347 | * stored in the new thread. | |
348 | */ | |
349 | static void switch_booke_debug_regs(struct thread_struct *new_thread) | |
350 | { | |
351 | if ((current->thread.dbcr0 & DBCR0_IDM) | |
352 | || (new_thread->dbcr0 & DBCR0_IDM)) | |
353 | prime_debug_regs(new_thread); | |
354 | } | |
355 | #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ | |
356 | static void set_debug_reg_defaults(struct thread_struct *thread) | |
357 | { | |
358 | if (thread->dabr) { | |
359 | thread->dabr = 0; | |
360 | set_dabr(0); | |
361 | } | |
362 | } | |
363 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ | |
364 | ||
14cf11af PM |
365 | int set_dabr(unsigned long dabr) |
366 | { | |
a2ceff5e ME |
367 | __get_cpu_var(current_dabr) = dabr; |
368 | ||
cab0af98 ME |
369 | if (ppc_md.set_dabr) |
370 | return ppc_md.set_dabr(dabr); | |
14cf11af | 371 | |
791cc501 | 372 | /* XXX should we have a CPU_FTR_HAS_DABR ? */ |
172ae2e7 | 373 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
d6a61bfc | 374 | mtspr(SPRN_DAC1, dabr); |
221c185d DK |
375 | #ifdef CONFIG_PPC_47x |
376 | isync(); | |
377 | #endif | |
c6c9eace BH |
378 | #elif defined(CONFIG_PPC_BOOK3S) |
379 | mtspr(SPRN_DABR, dabr); | |
d6a61bfc LM |
380 | #endif |
381 | ||
c6c9eace | 382 | |
cab0af98 | 383 | return 0; |
14cf11af PM |
384 | } |
385 | ||
06d67d54 PM |
386 | #ifdef CONFIG_PPC64 |
387 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
06d67d54 | 388 | #endif |
14cf11af PM |
389 | |
390 | struct task_struct *__switch_to(struct task_struct *prev, | |
391 | struct task_struct *new) | |
392 | { | |
393 | struct thread_struct *new_thread, *old_thread; | |
394 | unsigned long flags; | |
395 | struct task_struct *last; | |
396 | ||
397 | #ifdef CONFIG_SMP | |
398 | /* avoid complexity of lazy save/restore of fpu | |
399 | * by just saving it every time we switch out if | |
400 | * this task used the fpu during the last quantum. | |
401 | * | |
402 | * If it tries to use the fpu again, it'll trap and | |
403 | * reload its fp regs. So we don't have to do a restore | |
404 | * every switch, just a save. | |
405 | * -- Cort | |
406 | */ | |
407 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) | |
408 | giveup_fpu(prev); | |
409 | #ifdef CONFIG_ALTIVEC | |
410 | /* | |
411 | * If the previous thread used altivec in the last quantum | |
412 | * (thus changing altivec regs) then save them. | |
413 | * We used to check the VRSAVE register but not all apps | |
414 | * set it, so we don't rely on it now (and in fact we need | |
415 | * to save & restore VSCR even if VRSAVE == 0). -- paulus | |
416 | * | |
417 | * On SMP we always save/restore altivec regs just to avoid the | |
418 | * complexity of changing processors. | |
419 | * -- Cort | |
420 | */ | |
421 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) | |
422 | giveup_altivec(prev); | |
14cf11af | 423 | #endif /* CONFIG_ALTIVEC */ |
ce48b210 MN |
424 | #ifdef CONFIG_VSX |
425 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VSX)) | |
7c292170 MN |
426 | /* VMX and FPU registers are already save here */ |
427 | __giveup_vsx(prev); | |
ce48b210 | 428 | #endif /* CONFIG_VSX */ |
14cf11af PM |
429 | #ifdef CONFIG_SPE |
430 | /* | |
431 | * If the previous thread used spe in the last quantum | |
432 | * (thus changing spe regs) then save them. | |
433 | * | |
434 | * On SMP we always save/restore spe regs just to avoid the | |
435 | * complexity of changing processors. | |
436 | */ | |
437 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) | |
438 | giveup_spe(prev); | |
c0c0d996 PM |
439 | #endif /* CONFIG_SPE */ |
440 | ||
441 | #else /* CONFIG_SMP */ | |
442 | #ifdef CONFIG_ALTIVEC | |
443 | /* Avoid the trap. On smp this this never happens since | |
444 | * we don't set last_task_used_altivec -- Cort | |
445 | */ | |
446 | if (new->thread.regs && last_task_used_altivec == new) | |
447 | new->thread.regs->msr |= MSR_VEC; | |
448 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
449 | #ifdef CONFIG_VSX |
450 | if (new->thread.regs && last_task_used_vsx == new) | |
451 | new->thread.regs->msr |= MSR_VSX; | |
452 | #endif /* CONFIG_VSX */ | |
c0c0d996 | 453 | #ifdef CONFIG_SPE |
14cf11af PM |
454 | /* Avoid the trap. On smp this this never happens since |
455 | * we don't set last_task_used_spe | |
456 | */ | |
457 | if (new->thread.regs && last_task_used_spe == new) | |
458 | new->thread.regs->msr |= MSR_SPE; | |
459 | #endif /* CONFIG_SPE */ | |
c0c0d996 | 460 | |
14cf11af PM |
461 | #endif /* CONFIG_SMP */ |
462 | ||
172ae2e7 | 463 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
3bffb652 | 464 | switch_booke_debug_regs(&new->thread); |
c6c9eace | 465 | #else |
5aae8a53 P |
466 | /* |
467 | * For PPC_BOOK3S_64, we use the hw-breakpoint interfaces that would | |
468 | * schedule DABR | |
469 | */ | |
470 | #ifndef CONFIG_HAVE_HW_BREAKPOINT | |
c6c9eace BH |
471 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) |
472 | set_dabr(new->thread.dabr); | |
5aae8a53 | 473 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ |
d6a61bfc LM |
474 | #endif |
475 | ||
c6c9eace | 476 | |
14cf11af PM |
477 | new_thread = &new->thread; |
478 | old_thread = ¤t->thread; | |
06d67d54 PM |
479 | |
480 | #ifdef CONFIG_PPC64 | |
481 | /* | |
482 | * Collect processor utilization data per process | |
483 | */ | |
484 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
485 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); | |
486 | long unsigned start_tb, current_tb; | |
487 | start_tb = old_thread->start_tb; | |
488 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
489 | old_thread->accum_tb += (current_tb - start_tb); | |
490 | new_thread->start_tb = current_tb; | |
491 | } | |
492 | #endif | |
493 | ||
14cf11af | 494 | local_irq_save(flags); |
c6622f63 PM |
495 | |
496 | account_system_vtime(current); | |
81a3843f | 497 | account_process_vtime(current); |
c6622f63 PM |
498 | calculate_steal_time(); |
499 | ||
44387e9f AB |
500 | /* |
501 | * We can't take a PMU exception inside _switch() since there is a | |
502 | * window where the kernel stack SLB and the kernel stack are out | |
503 | * of sync. Hard disable here. | |
504 | */ | |
505 | hard_irq_disable(); | |
14cf11af PM |
506 | last = _switch(old_thread, new_thread); |
507 | ||
508 | local_irq_restore(flags); | |
509 | ||
510 | return last; | |
511 | } | |
512 | ||
06d67d54 PM |
513 | static int instructions_to_print = 16; |
514 | ||
06d67d54 PM |
515 | static void show_instructions(struct pt_regs *regs) |
516 | { | |
517 | int i; | |
518 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
519 | sizeof(int)); | |
520 | ||
521 | printk("Instruction dump:"); | |
522 | ||
523 | for (i = 0; i < instructions_to_print; i++) { | |
524 | int instr; | |
525 | ||
526 | if (!(i % 8)) | |
527 | printk("\n"); | |
528 | ||
0de2d820 SW |
529 | #if !defined(CONFIG_BOOKE) |
530 | /* If executing with the IMMU off, adjust pc rather | |
531 | * than print XXXXXXXX. | |
532 | */ | |
533 | if (!(regs->msr & MSR_IR)) | |
534 | pc = (unsigned long)phys_to_virt(pc); | |
535 | #endif | |
536 | ||
af308377 SR |
537 | /* We use __get_user here *only* to avoid an OOPS on a |
538 | * bad address because the pc *should* only be a | |
539 | * kernel address. | |
540 | */ | |
00ae36de AB |
541 | if (!__kernel_text_address(pc) || |
542 | __get_user(instr, (unsigned int __user *)pc)) { | |
06d67d54 PM |
543 | printk("XXXXXXXX "); |
544 | } else { | |
545 | if (regs->nip == pc) | |
546 | printk("<%08x> ", instr); | |
547 | else | |
548 | printk("%08x ", instr); | |
549 | } | |
550 | ||
551 | pc += sizeof(int); | |
552 | } | |
553 | ||
554 | printk("\n"); | |
555 | } | |
556 | ||
557 | static struct regbit { | |
558 | unsigned long bit; | |
559 | const char *name; | |
560 | } msr_bits[] = { | |
561 | {MSR_EE, "EE"}, | |
562 | {MSR_PR, "PR"}, | |
563 | {MSR_FP, "FP"}, | |
ce48b210 MN |
564 | {MSR_VEC, "VEC"}, |
565 | {MSR_VSX, "VSX"}, | |
06d67d54 | 566 | {MSR_ME, "ME"}, |
1b98326b KG |
567 | {MSR_CE, "CE"}, |
568 | {MSR_DE, "DE"}, | |
06d67d54 PM |
569 | {MSR_IR, "IR"}, |
570 | {MSR_DR, "DR"}, | |
571 | {0, NULL} | |
572 | }; | |
573 | ||
574 | static void printbits(unsigned long val, struct regbit *bits) | |
575 | { | |
576 | const char *sep = ""; | |
577 | ||
578 | printk("<"); | |
579 | for (; bits->bit; ++bits) | |
580 | if (val & bits->bit) { | |
581 | printk("%s%s", sep, bits->name); | |
582 | sep = ","; | |
583 | } | |
584 | printk(">"); | |
585 | } | |
586 | ||
587 | #ifdef CONFIG_PPC64 | |
f6f7dde3 | 588 | #define REG "%016lx" |
06d67d54 PM |
589 | #define REGS_PER_LINE 4 |
590 | #define LAST_VOLATILE 13 | |
591 | #else | |
f6f7dde3 | 592 | #define REG "%08lx" |
06d67d54 PM |
593 | #define REGS_PER_LINE 8 |
594 | #define LAST_VOLATILE 12 | |
595 | #endif | |
596 | ||
14cf11af PM |
597 | void show_regs(struct pt_regs * regs) |
598 | { | |
599 | int i, trap; | |
600 | ||
06d67d54 PM |
601 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
602 | regs->nip, regs->link, regs->ctr); | |
603 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
96b644bd | 604 | regs, regs->trap, print_tainted(), init_utsname()->release); |
06d67d54 PM |
605 | printk("MSR: "REG" ", regs->msr); |
606 | printbits(regs->msr, msr_bits); | |
f6f7dde3 | 607 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); |
14cf11af PM |
608 | trap = TRAP(regs); |
609 | if (trap == 0x300 || trap == 0x600) | |
172ae2e7 | 610 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
14170789 KG |
611 | printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr); |
612 | #else | |
06d67d54 | 613 | printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr); |
14170789 | 614 | #endif |
06d67d54 | 615 | printk("TASK = %p[%d] '%s' THREAD: %p", |
19c5870c | 616 | current, task_pid_nr(current), current->comm, task_thread_info(current)); |
14cf11af PM |
617 | |
618 | #ifdef CONFIG_SMP | |
79ccd1be | 619 | printk(" CPU: %d", raw_smp_processor_id()); |
14cf11af PM |
620 | #endif /* CONFIG_SMP */ |
621 | ||
622 | for (i = 0; i < 32; i++) { | |
06d67d54 | 623 | if ((i % REGS_PER_LINE) == 0) |
a2367194 | 624 | printk("\nGPR%02d: ", i); |
06d67d54 PM |
625 | printk(REG " ", regs->gpr[i]); |
626 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
627 | break; |
628 | } | |
629 | printk("\n"); | |
630 | #ifdef CONFIG_KALLSYMS | |
631 | /* | |
632 | * Lookup NIP late so we have the best change of getting the | |
633 | * above info out without failing | |
634 | */ | |
058c78f4 BH |
635 | printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip); |
636 | printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link); | |
14cf11af PM |
637 | #endif |
638 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
639 | if (!user_mode(regs)) |
640 | show_instructions(regs); | |
14cf11af PM |
641 | } |
642 | ||
643 | void exit_thread(void) | |
644 | { | |
48abec07 | 645 | discard_lazy_cpu_state(); |
14cf11af PM |
646 | } |
647 | ||
648 | void flush_thread(void) | |
649 | { | |
48abec07 | 650 | discard_lazy_cpu_state(); |
14cf11af | 651 | |
5aae8a53 P |
652 | #ifdef CONFIG_HAVE_HW_BREAKPOINTS |
653 | flush_ptrace_hw_breakpoint(current); | |
654 | #else /* CONFIG_HAVE_HW_BREAKPOINTS */ | |
3bffb652 | 655 | set_debug_reg_defaults(¤t->thread); |
5aae8a53 | 656 | #endif /* CONFIG_HAVE_HW_BREAKPOINTS */ |
14cf11af PM |
657 | } |
658 | ||
659 | void | |
660 | release_thread(struct task_struct *t) | |
661 | { | |
662 | } | |
663 | ||
664 | /* | |
665 | * This gets called before we allocate a new thread and copy | |
666 | * the current task into it. | |
667 | */ | |
668 | void prepare_to_copy(struct task_struct *tsk) | |
669 | { | |
670 | flush_fp_to_thread(current); | |
671 | flush_altivec_to_thread(current); | |
ce48b210 | 672 | flush_vsx_to_thread(current); |
14cf11af | 673 | flush_spe_to_thread(current); |
5aae8a53 P |
674 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
675 | flush_ptrace_hw_breakpoint(tsk); | |
676 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ | |
14cf11af PM |
677 | } |
678 | ||
679 | /* | |
680 | * Copy a thread.. | |
681 | */ | |
6f2c55b8 | 682 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
06d67d54 PM |
683 | unsigned long unused, struct task_struct *p, |
684 | struct pt_regs *regs) | |
14cf11af PM |
685 | { |
686 | struct pt_regs *childregs, *kregs; | |
687 | extern void ret_from_fork(void); | |
0cec6fd1 | 688 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
689 | |
690 | CHECK_FULL_REGS(regs); | |
691 | /* Copy registers */ | |
692 | sp -= sizeof(struct pt_regs); | |
693 | childregs = (struct pt_regs *) sp; | |
694 | *childregs = *regs; | |
695 | if ((childregs->msr & MSR_PR) == 0) { | |
696 | /* for kernel thread, set `current' and stackptr in new task */ | |
697 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 698 | #ifdef CONFIG_PPC32 |
14cf11af | 699 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 700 | #else |
b5e2fc1c | 701 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 702 | #endif |
14cf11af PM |
703 | p->thread.regs = NULL; /* no user register state */ |
704 | } else { | |
705 | childregs->gpr[1] = usp; | |
706 | p->thread.regs = childregs; | |
06d67d54 PM |
707 | if (clone_flags & CLONE_SETTLS) { |
708 | #ifdef CONFIG_PPC64 | |
709 | if (!test_thread_flag(TIF_32BIT)) | |
710 | childregs->gpr[13] = childregs->gpr[6]; | |
711 | else | |
712 | #endif | |
713 | childregs->gpr[2] = childregs->gpr[6]; | |
714 | } | |
14cf11af PM |
715 | } |
716 | childregs->gpr[3] = 0; /* Result from fork() */ | |
717 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
718 | |
719 | /* | |
720 | * The way this works is that at some point in the future | |
721 | * some task will call _switch to switch to the new task. | |
722 | * That will pop off the stack frame created below and start | |
723 | * the new task running at ret_from_fork. The new task will | |
724 | * do some house keeping and then return from the fork or clone | |
725 | * system call, using the stack frame created above. | |
726 | */ | |
727 | sp -= sizeof(struct pt_regs); | |
728 | kregs = (struct pt_regs *) sp; | |
729 | sp -= STACK_FRAME_OVERHEAD; | |
730 | p->thread.ksp = sp; | |
85218827 KG |
731 | p->thread.ksp_limit = (unsigned long)task_stack_page(p) + |
732 | _ALIGN_UP(sizeof(struct thread_info), 16); | |
14cf11af | 733 | |
94491685 | 734 | #ifdef CONFIG_PPC_STD_MMU_64 |
06d67d54 | 735 | if (cpu_has_feature(CPU_FTR_SLB)) { |
1189be65 | 736 | unsigned long sp_vsid; |
3c726f8d | 737 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 | 738 | |
1189be65 PM |
739 | if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) |
740 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) | |
741 | << SLB_VSID_SHIFT_1T; | |
742 | else | |
743 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) | |
744 | << SLB_VSID_SHIFT; | |
3c726f8d | 745 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
746 | p->thread.ksp_vsid = sp_vsid; |
747 | } | |
747bea91 | 748 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
06d67d54 PM |
749 | |
750 | /* | |
751 | * The PPC64 ABI makes use of a TOC to contain function | |
752 | * pointers. The function (ret_from_except) is actually a pointer | |
753 | * to the TOC entry. The first entry is a pointer to the actual | |
754 | * function. | |
755 | */ | |
747bea91 | 756 | #ifdef CONFIG_PPC64 |
06d67d54 PM |
757 | kregs->nip = *((unsigned long *)ret_from_fork); |
758 | #else | |
759 | kregs->nip = (unsigned long)ret_from_fork; | |
06d67d54 | 760 | #endif |
14cf11af PM |
761 | |
762 | return 0; | |
763 | } | |
764 | ||
765 | /* | |
766 | * Set up a thread for executing a new program | |
767 | */ | |
06d67d54 | 768 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 769 | { |
90eac727 ME |
770 | #ifdef CONFIG_PPC64 |
771 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
772 | #endif | |
773 | ||
14cf11af | 774 | set_fs(USER_DS); |
06d67d54 PM |
775 | |
776 | /* | |
777 | * If we exec out of a kernel thread then thread.regs will not be | |
778 | * set. Do it now. | |
779 | */ | |
780 | if (!current->thread.regs) { | |
0cec6fd1 AV |
781 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
782 | current->thread.regs = regs - 1; | |
06d67d54 PM |
783 | } |
784 | ||
14cf11af PM |
785 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
786 | regs->ctr = 0; | |
787 | regs->link = 0; | |
788 | regs->xer = 0; | |
789 | regs->ccr = 0; | |
14cf11af | 790 | regs->gpr[1] = sp; |
06d67d54 | 791 | |
474f8196 RM |
792 | /* |
793 | * We have just cleared all the nonvolatile GPRs, so make | |
794 | * FULL_REGS(regs) return true. This is necessary to allow | |
795 | * ptrace to examine the thread immediately after exec. | |
796 | */ | |
797 | regs->trap &= ~1UL; | |
798 | ||
06d67d54 PM |
799 | #ifdef CONFIG_PPC32 |
800 | regs->mq = 0; | |
801 | regs->nip = start; | |
14cf11af | 802 | regs->msr = MSR_USER; |
06d67d54 | 803 | #else |
d4bf9a78 | 804 | if (!test_thread_flag(TIF_32BIT)) { |
90eac727 | 805 | unsigned long entry, toc; |
06d67d54 PM |
806 | |
807 | /* start is a relocated pointer to the function descriptor for | |
808 | * the elf _start routine. The first entry in the function | |
809 | * descriptor is the entry address of _start and the second | |
810 | * entry is the TOC value we need to use. | |
811 | */ | |
812 | __get_user(entry, (unsigned long __user *)start); | |
813 | __get_user(toc, (unsigned long __user *)start+1); | |
814 | ||
815 | /* Check whether the e_entry function descriptor entries | |
816 | * need to be relocated before we can use them. | |
817 | */ | |
818 | if (load_addr != 0) { | |
819 | entry += load_addr; | |
820 | toc += load_addr; | |
821 | } | |
822 | regs->nip = entry; | |
823 | regs->gpr[2] = toc; | |
824 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
825 | } else { |
826 | regs->nip = start; | |
827 | regs->gpr[2] = 0; | |
828 | regs->msr = MSR_USER32; | |
06d67d54 PM |
829 | } |
830 | #endif | |
831 | ||
48abec07 | 832 | discard_lazy_cpu_state(); |
ce48b210 MN |
833 | #ifdef CONFIG_VSX |
834 | current->thread.used_vsr = 0; | |
835 | #endif | |
14cf11af | 836 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 837 | current->thread.fpscr.val = 0; |
14cf11af PM |
838 | #ifdef CONFIG_ALTIVEC |
839 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
840 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 841 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
842 | current->thread.vrsave = 0; |
843 | current->thread.used_vr = 0; | |
844 | #endif /* CONFIG_ALTIVEC */ | |
845 | #ifdef CONFIG_SPE | |
846 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
847 | current->thread.acc = 0; | |
848 | current->thread.spefscr = 0; | |
849 | current->thread.used_spe = 0; | |
850 | #endif /* CONFIG_SPE */ | |
851 | } | |
852 | ||
853 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
854 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
855 | ||
856 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
857 | { | |
858 | struct pt_regs *regs = tsk->thread.regs; | |
859 | ||
860 | /* This is a bit hairy. If we are an SPE enabled processor | |
861 | * (have embedded fp) we store the IEEE exception enable flags in | |
862 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
863 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
864 | if (val & PR_FP_EXC_SW_ENABLE) { | |
865 | #ifdef CONFIG_SPE | |
5e14d21e KG |
866 | if (cpu_has_feature(CPU_FTR_SPE)) { |
867 | tsk->thread.fpexc_mode = val & | |
868 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
869 | return 0; | |
870 | } else { | |
871 | return -EINVAL; | |
872 | } | |
14cf11af PM |
873 | #else |
874 | return -EINVAL; | |
875 | #endif | |
14cf11af | 876 | } |
06d67d54 PM |
877 | |
878 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
879 | * __pack_fe01 use do not overlap with bits used for | |
880 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
881 | * on CONFIG_SPE implementations are reserved so writing to | |
882 | * them does not change anything */ | |
883 | if (val > PR_FP_EXC_PRECISE) | |
884 | return -EINVAL; | |
885 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
886 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
887 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
888 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
889 | return 0; |
890 | } | |
891 | ||
892 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
893 | { | |
894 | unsigned int val; | |
895 | ||
896 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
897 | #ifdef CONFIG_SPE | |
5e14d21e KG |
898 | if (cpu_has_feature(CPU_FTR_SPE)) |
899 | val = tsk->thread.fpexc_mode; | |
900 | else | |
901 | return -EINVAL; | |
14cf11af PM |
902 | #else |
903 | return -EINVAL; | |
904 | #endif | |
905 | else | |
906 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
907 | return put_user(val, (unsigned int __user *) adr); | |
908 | } | |
909 | ||
fab5db97 PM |
910 | int set_endian(struct task_struct *tsk, unsigned int val) |
911 | { | |
912 | struct pt_regs *regs = tsk->thread.regs; | |
913 | ||
914 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
915 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
916 | return -EINVAL; | |
917 | ||
918 | if (regs == NULL) | |
919 | return -EINVAL; | |
920 | ||
921 | if (val == PR_ENDIAN_BIG) | |
922 | regs->msr &= ~MSR_LE; | |
923 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
924 | regs->msr |= MSR_LE; | |
925 | else | |
926 | return -EINVAL; | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
931 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
932 | { | |
933 | struct pt_regs *regs = tsk->thread.regs; | |
934 | unsigned int val; | |
935 | ||
936 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
937 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
938 | return -EINVAL; | |
939 | ||
940 | if (regs == NULL) | |
941 | return -EINVAL; | |
942 | ||
943 | if (regs->msr & MSR_LE) { | |
944 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
945 | val = PR_ENDIAN_LITTLE; | |
946 | else | |
947 | val = PR_ENDIAN_PPC_LITTLE; | |
948 | } else | |
949 | val = PR_ENDIAN_BIG; | |
950 | ||
951 | return put_user(val, (unsigned int __user *)adr); | |
952 | } | |
953 | ||
e9370ae1 PM |
954 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
955 | { | |
956 | tsk->thread.align_ctl = val; | |
957 | return 0; | |
958 | } | |
959 | ||
960 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
961 | { | |
962 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
963 | } | |
964 | ||
06d67d54 PM |
965 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
966 | ||
14cf11af PM |
967 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
968 | int __user *parent_tidp, void __user *child_threadptr, | |
969 | int __user *child_tidp, int p6, | |
970 | struct pt_regs *regs) | |
971 | { | |
972 | CHECK_FULL_REGS(regs); | |
973 | if (usp == 0) | |
974 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 PM |
975 | #ifdef CONFIG_PPC64 |
976 | if (test_thread_flag(TIF_32BIT)) { | |
977 | parent_tidp = TRUNC_PTR(parent_tidp); | |
978 | child_tidp = TRUNC_PTR(child_tidp); | |
979 | } | |
980 | #endif | |
14cf11af PM |
981 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
982 | } | |
983 | ||
984 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
985 | unsigned long p4, unsigned long p5, unsigned long p6, | |
986 | struct pt_regs *regs) | |
987 | { | |
988 | CHECK_FULL_REGS(regs); | |
989 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
990 | } | |
991 | ||
992 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
993 | unsigned long p4, unsigned long p5, unsigned long p6, | |
994 | struct pt_regs *regs) | |
995 | { | |
996 | CHECK_FULL_REGS(regs); | |
997 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
998 | regs, 0, NULL, NULL); | |
999 | } | |
1000 | ||
1001 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
1002 | unsigned long a3, unsigned long a4, unsigned long a5, | |
1003 | struct pt_regs *regs) | |
1004 | { | |
1005 | int error; | |
06d67d54 | 1006 | char *filename; |
14cf11af PM |
1007 | |
1008 | filename = getname((char __user *) a0); | |
1009 | error = PTR_ERR(filename); | |
1010 | if (IS_ERR(filename)) | |
1011 | goto out; | |
1012 | flush_fp_to_thread(current); | |
1013 | flush_altivec_to_thread(current); | |
1014 | flush_spe_to_thread(current); | |
20c8c210 PM |
1015 | error = do_execve(filename, (char __user * __user *) a1, |
1016 | (char __user * __user *) a2, regs); | |
14cf11af PM |
1017 | putname(filename); |
1018 | out: | |
1019 | return error; | |
1020 | } | |
1021 | ||
bb72c481 PM |
1022 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, |
1023 | unsigned long nbytes) | |
1024 | { | |
1025 | unsigned long stack_page; | |
1026 | unsigned long cpu = task_cpu(p); | |
1027 | ||
1028 | /* | |
1029 | * Avoid crashing if the stack has overflowed and corrupted | |
1030 | * task_cpu(p), which is in the thread_info struct. | |
1031 | */ | |
1032 | if (cpu < NR_CPUS && cpu_possible(cpu)) { | |
1033 | stack_page = (unsigned long) hardirq_ctx[cpu]; | |
1034 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1035 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1036 | return 1; | |
1037 | ||
1038 | stack_page = (unsigned long) softirq_ctx[cpu]; | |
1039 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1040 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1041 | return 1; | |
1042 | } | |
1043 | return 0; | |
1044 | } | |
1045 | ||
2f25194d | 1046 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
1047 | unsigned long nbytes) |
1048 | { | |
0cec6fd1 | 1049 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
1050 | |
1051 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1052 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1053 | return 1; | |
1054 | ||
bb72c481 | 1055 | return valid_irq_stack(sp, p, nbytes); |
14cf11af PM |
1056 | } |
1057 | ||
2f25194d AB |
1058 | EXPORT_SYMBOL(validate_sp); |
1059 | ||
14cf11af PM |
1060 | unsigned long get_wchan(struct task_struct *p) |
1061 | { | |
1062 | unsigned long ip, sp; | |
1063 | int count = 0; | |
1064 | ||
1065 | if (!p || p == current || p->state == TASK_RUNNING) | |
1066 | return 0; | |
1067 | ||
1068 | sp = p->thread.ksp; | |
ec2b36b9 | 1069 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
1070 | return 0; |
1071 | ||
1072 | do { | |
1073 | sp = *(unsigned long *)sp; | |
ec2b36b9 | 1074 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
1075 | return 0; |
1076 | if (count > 0) { | |
ec2b36b9 | 1077 | ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE]; |
14cf11af PM |
1078 | if (!in_sched_functions(ip)) |
1079 | return ip; | |
1080 | } | |
1081 | } while (count++ < 16); | |
1082 | return 0; | |
1083 | } | |
06d67d54 | 1084 | |
c4d04be1 | 1085 | static int kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH; |
06d67d54 PM |
1086 | |
1087 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
1088 | { | |
1089 | unsigned long sp, ip, lr, newsp; | |
1090 | int count = 0; | |
1091 | int firstframe = 1; | |
6794c782 SR |
1092 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1093 | int curr_frame = current->curr_ret_stack; | |
1094 | extern void return_to_handler(void); | |
9135c3cc SR |
1095 | unsigned long rth = (unsigned long)return_to_handler; |
1096 | unsigned long mrth = -1; | |
6794c782 | 1097 | #ifdef CONFIG_PPC64 |
9135c3cc SR |
1098 | extern void mod_return_to_handler(void); |
1099 | rth = *(unsigned long *)rth; | |
1100 | mrth = (unsigned long)mod_return_to_handler; | |
1101 | mrth = *(unsigned long *)mrth; | |
6794c782 SR |
1102 | #endif |
1103 | #endif | |
06d67d54 PM |
1104 | |
1105 | sp = (unsigned long) stack; | |
1106 | if (tsk == NULL) | |
1107 | tsk = current; | |
1108 | if (sp == 0) { | |
1109 | if (tsk == current) | |
1110 | asm("mr %0,1" : "=r" (sp)); | |
1111 | else | |
1112 | sp = tsk->thread.ksp; | |
1113 | } | |
1114 | ||
1115 | lr = 0; | |
1116 | printk("Call Trace:\n"); | |
1117 | do { | |
ec2b36b9 | 1118 | if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) |
06d67d54 PM |
1119 | return; |
1120 | ||
1121 | stack = (unsigned long *) sp; | |
1122 | newsp = stack[0]; | |
ec2b36b9 | 1123 | ip = stack[STACK_FRAME_LR_SAVE]; |
06d67d54 | 1124 | if (!firstframe || ip != lr) { |
058c78f4 | 1125 | printk("["REG"] ["REG"] %pS", sp, ip, (void *)ip); |
6794c782 | 1126 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
9135c3cc | 1127 | if ((ip == rth || ip == mrth) && curr_frame >= 0) { |
6794c782 SR |
1128 | printk(" (%pS)", |
1129 | (void *)current->ret_stack[curr_frame].ret); | |
1130 | curr_frame--; | |
1131 | } | |
1132 | #endif | |
06d67d54 PM |
1133 | if (firstframe) |
1134 | printk(" (unreliable)"); | |
1135 | printk("\n"); | |
1136 | } | |
1137 | firstframe = 0; | |
1138 | ||
1139 | /* | |
1140 | * See if this is an exception frame. | |
1141 | * We look for the "regshere" marker in the current frame. | |
1142 | */ | |
ec2b36b9 BH |
1143 | if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) |
1144 | && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { | |
06d67d54 PM |
1145 | struct pt_regs *regs = (struct pt_regs *) |
1146 | (sp + STACK_FRAME_OVERHEAD); | |
06d67d54 | 1147 | lr = regs->link; |
058c78f4 BH |
1148 | printk("--- Exception: %lx at %pS\n LR = %pS\n", |
1149 | regs->trap, (void *)regs->nip, (void *)lr); | |
06d67d54 PM |
1150 | firstframe = 1; |
1151 | } | |
1152 | ||
1153 | sp = newsp; | |
1154 | } while (count++ < kstack_depth_to_print); | |
1155 | } | |
1156 | ||
1157 | void dump_stack(void) | |
1158 | { | |
1159 | show_stack(current, NULL); | |
1160 | } | |
1161 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
1162 | |
1163 | #ifdef CONFIG_PPC64 | |
1164 | void ppc64_runlatch_on(void) | |
1165 | { | |
1166 | unsigned long ctrl; | |
1167 | ||
1168 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
1169 | HMT_medium(); | |
1170 | ||
1171 | ctrl = mfspr(SPRN_CTRLF); | |
1172 | ctrl |= CTRL_RUNLATCH; | |
1173 | mtspr(SPRN_CTRLT, ctrl); | |
1174 | ||
1175 | set_thread_flag(TIF_RUNLATCH); | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | void ppc64_runlatch_off(void) | |
1180 | { | |
1181 | unsigned long ctrl; | |
1182 | ||
1183 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { | |
1184 | HMT_medium(); | |
1185 | ||
1186 | clear_thread_flag(TIF_RUNLATCH); | |
1187 | ||
1188 | ctrl = mfspr(SPRN_CTRLF); | |
1189 | ctrl &= ~CTRL_RUNLATCH; | |
1190 | mtspr(SPRN_CTRLT, ctrl); | |
1191 | } | |
1192 | } | |
1193 | #endif | |
f6a61680 BH |
1194 | |
1195 | #if THREAD_SHIFT < PAGE_SHIFT | |
1196 | ||
1197 | static struct kmem_cache *thread_info_cache; | |
1198 | ||
1199 | struct thread_info *alloc_thread_info(struct task_struct *tsk) | |
1200 | { | |
1201 | struct thread_info *ti; | |
1202 | ||
1203 | ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL); | |
1204 | if (unlikely(ti == NULL)) | |
1205 | return NULL; | |
1206 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
1207 | memset(ti, 0, THREAD_SIZE); | |
1208 | #endif | |
1209 | return ti; | |
1210 | } | |
1211 | ||
1212 | void free_thread_info(struct thread_info *ti) | |
1213 | { | |
1214 | kmem_cache_free(thread_info_cache, ti); | |
1215 | } | |
1216 | ||
1217 | void thread_info_cache_init(void) | |
1218 | { | |
1219 | thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, | |
1220 | THREAD_SIZE, 0, NULL); | |
1221 | BUG_ON(thread_info_cache == NULL); | |
1222 | } | |
1223 | ||
1224 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ | |
d839088c AB |
1225 | |
1226 | unsigned long arch_align_stack(unsigned long sp) | |
1227 | { | |
1228 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) | |
1229 | sp -= get_random_int() & ~PAGE_MASK; | |
1230 | return sp & ~0xf; | |
1231 | } | |
912f9ee2 AB |
1232 | |
1233 | static inline unsigned long brk_rnd(void) | |
1234 | { | |
1235 | unsigned long rnd = 0; | |
1236 | ||
1237 | /* 8MB for 32bit, 1GB for 64bit */ | |
1238 | if (is_32bit_task()) | |
1239 | rnd = (long)(get_random_int() % (1<<(23-PAGE_SHIFT))); | |
1240 | else | |
1241 | rnd = (long)(get_random_int() % (1<<(30-PAGE_SHIFT))); | |
1242 | ||
1243 | return rnd << PAGE_SHIFT; | |
1244 | } | |
1245 | ||
1246 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
1247 | { | |
8bbde7a7 AB |
1248 | unsigned long base = mm->brk; |
1249 | unsigned long ret; | |
1250 | ||
ce7a35c7 | 1251 | #ifdef CONFIG_PPC_STD_MMU_64 |
8bbde7a7 AB |
1252 | /* |
1253 | * If we are using 1TB segments and we are allowed to randomise | |
1254 | * the heap, we can put it above 1TB so it is backed by a 1TB | |
1255 | * segment. Otherwise the heap will be in the bottom 1TB | |
1256 | * which always uses 256MB segments and this may result in a | |
1257 | * performance penalty. | |
1258 | */ | |
1259 | if (!is_32bit_task() && (mmu_highuser_ssize == MMU_SEGSIZE_1T)) | |
1260 | base = max_t(unsigned long, mm->brk, 1UL << SID_SHIFT_1T); | |
1261 | #endif | |
1262 | ||
1263 | ret = PAGE_ALIGN(base + brk_rnd()); | |
912f9ee2 AB |
1264 | |
1265 | if (ret < mm->brk) | |
1266 | return mm->brk; | |
1267 | ||
1268 | return ret; | |
1269 | } | |
501cb16d AB |
1270 | |
1271 | unsigned long randomize_et_dyn(unsigned long base) | |
1272 | { | |
1273 | unsigned long ret = PAGE_ALIGN(base + brk_rnd()); | |
1274 | ||
1275 | if (ret < base) | |
1276 | return base; | |
1277 | ||
1278 | return ret; | |
1279 | } |