]>
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> | |
4b16f8e2 | 31 | #include <linux/export.h> |
14cf11af PM |
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 | } | |
de56a948 | 99 | EXPORT_SYMBOL_GPL(flush_fp_to_thread); |
14cf11af PM |
100 | |
101 | void enable_kernel_fp(void) | |
102 | { | |
103 | WARN_ON(preemptible()); | |
104 | ||
105 | #ifdef CONFIG_SMP | |
106 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) | |
107 | giveup_fpu(current); | |
108 | else | |
109 | giveup_fpu(NULL); /* just enables FP for kernel */ | |
110 | #else | |
111 | giveup_fpu(last_task_used_math); | |
112 | #endif /* CONFIG_SMP */ | |
113 | } | |
114 | EXPORT_SYMBOL(enable_kernel_fp); | |
115 | ||
14cf11af PM |
116 | #ifdef CONFIG_ALTIVEC |
117 | void enable_kernel_altivec(void) | |
118 | { | |
119 | WARN_ON(preemptible()); | |
120 | ||
121 | #ifdef CONFIG_SMP | |
122 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) | |
123 | giveup_altivec(current); | |
124 | else | |
125 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ | |
126 | #else | |
127 | giveup_altivec(last_task_used_altivec); | |
128 | #endif /* CONFIG_SMP */ | |
129 | } | |
130 | EXPORT_SYMBOL(enable_kernel_altivec); | |
131 | ||
132 | /* | |
133 | * Make sure the VMX/Altivec register state in the | |
134 | * the thread_struct is up to date for task tsk. | |
135 | */ | |
136 | void flush_altivec_to_thread(struct task_struct *tsk) | |
137 | { | |
138 | if (tsk->thread.regs) { | |
139 | preempt_disable(); | |
140 | if (tsk->thread.regs->msr & MSR_VEC) { | |
141 | #ifdef CONFIG_SMP | |
142 | BUG_ON(tsk != current); | |
143 | #endif | |
0ee6c15e | 144 | giveup_altivec(tsk); |
14cf11af PM |
145 | } |
146 | preempt_enable(); | |
147 | } | |
148 | } | |
de56a948 | 149 | EXPORT_SYMBOL_GPL(flush_altivec_to_thread); |
14cf11af PM |
150 | #endif /* CONFIG_ALTIVEC */ |
151 | ||
ce48b210 MN |
152 | #ifdef CONFIG_VSX |
153 | #if 0 | |
154 | /* not currently used, but some crazy RAID module might want to later */ | |
155 | void enable_kernel_vsx(void) | |
156 | { | |
157 | WARN_ON(preemptible()); | |
158 | ||
159 | #ifdef CONFIG_SMP | |
160 | if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) | |
161 | giveup_vsx(current); | |
162 | else | |
163 | giveup_vsx(NULL); /* just enable vsx for kernel - force */ | |
164 | #else | |
165 | giveup_vsx(last_task_used_vsx); | |
166 | #endif /* CONFIG_SMP */ | |
167 | } | |
168 | EXPORT_SYMBOL(enable_kernel_vsx); | |
169 | #endif | |
170 | ||
7c292170 MN |
171 | void giveup_vsx(struct task_struct *tsk) |
172 | { | |
173 | giveup_fpu(tsk); | |
174 | giveup_altivec(tsk); | |
175 | __giveup_vsx(tsk); | |
176 | } | |
177 | ||
ce48b210 MN |
178 | void flush_vsx_to_thread(struct task_struct *tsk) |
179 | { | |
180 | if (tsk->thread.regs) { | |
181 | preempt_disable(); | |
182 | if (tsk->thread.regs->msr & MSR_VSX) { | |
183 | #ifdef CONFIG_SMP | |
184 | BUG_ON(tsk != current); | |
185 | #endif | |
186 | giveup_vsx(tsk); | |
187 | } | |
188 | preempt_enable(); | |
189 | } | |
190 | } | |
de56a948 | 191 | EXPORT_SYMBOL_GPL(flush_vsx_to_thread); |
ce48b210 MN |
192 | #endif /* CONFIG_VSX */ |
193 | ||
14cf11af PM |
194 | #ifdef CONFIG_SPE |
195 | ||
196 | void enable_kernel_spe(void) | |
197 | { | |
198 | WARN_ON(preemptible()); | |
199 | ||
200 | #ifdef CONFIG_SMP | |
201 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) | |
202 | giveup_spe(current); | |
203 | else | |
204 | giveup_spe(NULL); /* just enable SPE for kernel - force */ | |
205 | #else | |
206 | giveup_spe(last_task_used_spe); | |
207 | #endif /* __SMP __ */ | |
208 | } | |
209 | EXPORT_SYMBOL(enable_kernel_spe); | |
210 | ||
211 | void flush_spe_to_thread(struct task_struct *tsk) | |
212 | { | |
213 | if (tsk->thread.regs) { | |
214 | preempt_disable(); | |
215 | if (tsk->thread.regs->msr & MSR_SPE) { | |
216 | #ifdef CONFIG_SMP | |
217 | BUG_ON(tsk != current); | |
218 | #endif | |
685659ee | 219 | tsk->thread.spefscr = mfspr(SPRN_SPEFSCR); |
0ee6c15e | 220 | giveup_spe(tsk); |
14cf11af PM |
221 | } |
222 | preempt_enable(); | |
223 | } | |
224 | } | |
14cf11af PM |
225 | #endif /* CONFIG_SPE */ |
226 | ||
5388fb10 | 227 | #ifndef CONFIG_SMP |
48abec07 PM |
228 | /* |
229 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), | |
230 | * and the current task has some state, discard it. | |
231 | */ | |
5388fb10 | 232 | void discard_lazy_cpu_state(void) |
48abec07 | 233 | { |
48abec07 PM |
234 | preempt_disable(); |
235 | if (last_task_used_math == current) | |
236 | last_task_used_math = NULL; | |
237 | #ifdef CONFIG_ALTIVEC | |
238 | if (last_task_used_altivec == current) | |
239 | last_task_used_altivec = NULL; | |
240 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
241 | #ifdef CONFIG_VSX |
242 | if (last_task_used_vsx == current) | |
243 | last_task_used_vsx = NULL; | |
244 | #endif /* CONFIG_VSX */ | |
48abec07 PM |
245 | #ifdef CONFIG_SPE |
246 | if (last_task_used_spe == current) | |
247 | last_task_used_spe = NULL; | |
248 | #endif | |
249 | preempt_enable(); | |
48abec07 | 250 | } |
5388fb10 | 251 | #endif /* CONFIG_SMP */ |
48abec07 | 252 | |
3bffb652 DK |
253 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
254 | void do_send_trap(struct pt_regs *regs, unsigned long address, | |
255 | unsigned long error_code, int signal_code, int breakpt) | |
256 | { | |
257 | siginfo_t info; | |
258 | ||
259 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
260 | 11, SIGSEGV) == NOTIFY_STOP) | |
261 | return; | |
262 | ||
263 | /* Deliver the signal to userspace */ | |
264 | info.si_signo = SIGTRAP; | |
265 | info.si_errno = breakpt; /* breakpoint or watchpoint id */ | |
266 | info.si_code = signal_code; | |
267 | info.si_addr = (void __user *)address; | |
268 | force_sig_info(SIGTRAP, &info, current); | |
269 | } | |
270 | #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ | |
d6a61bfc LM |
271 | void do_dabr(struct pt_regs *regs, unsigned long address, |
272 | unsigned long error_code) | |
273 | { | |
274 | siginfo_t info; | |
275 | ||
276 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
277 | 11, SIGSEGV) == NOTIFY_STOP) | |
278 | return; | |
279 | ||
280 | if (debugger_dabr_match(regs)) | |
281 | return; | |
282 | ||
d6a61bfc LM |
283 | /* Clear the DABR */ |
284 | set_dabr(0); | |
285 | ||
286 | /* Deliver the signal to userspace */ | |
287 | info.si_signo = SIGTRAP; | |
288 | info.si_errno = 0; | |
289 | info.si_code = TRAP_HWBKPT; | |
290 | info.si_addr = (void __user *)address; | |
291 | force_sig_info(SIGTRAP, &info, current); | |
292 | } | |
3bffb652 | 293 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ |
d6a61bfc | 294 | |
a2ceff5e ME |
295 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
296 | ||
3bffb652 DK |
297 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
298 | /* | |
299 | * Set the debug registers back to their default "safe" values. | |
300 | */ | |
301 | static void set_debug_reg_defaults(struct thread_struct *thread) | |
302 | { | |
303 | thread->iac1 = thread->iac2 = 0; | |
304 | #if CONFIG_PPC_ADV_DEBUG_IACS > 2 | |
305 | thread->iac3 = thread->iac4 = 0; | |
306 | #endif | |
307 | thread->dac1 = thread->dac2 = 0; | |
308 | #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 | |
309 | thread->dvc1 = thread->dvc2 = 0; | |
310 | #endif | |
311 | thread->dbcr0 = 0; | |
312 | #ifdef CONFIG_BOOKE | |
313 | /* | |
314 | * Force User/Supervisor bits to b11 (user-only MSR[PR]=1) | |
315 | */ | |
316 | thread->dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | \ | |
317 | DBCR1_IAC3US | DBCR1_IAC4US; | |
318 | /* | |
319 | * Force Data Address Compare User/Supervisor bits to be User-only | |
320 | * (0b11 MSR[PR]=1) and set all other bits in DBCR2 register to be 0. | |
321 | */ | |
322 | thread->dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US; | |
323 | #else | |
324 | thread->dbcr1 = 0; | |
325 | #endif | |
326 | } | |
327 | ||
328 | static void prime_debug_regs(struct thread_struct *thread) | |
329 | { | |
330 | mtspr(SPRN_IAC1, thread->iac1); | |
331 | mtspr(SPRN_IAC2, thread->iac2); | |
332 | #if CONFIG_PPC_ADV_DEBUG_IACS > 2 | |
333 | mtspr(SPRN_IAC3, thread->iac3); | |
334 | mtspr(SPRN_IAC4, thread->iac4); | |
335 | #endif | |
336 | mtspr(SPRN_DAC1, thread->dac1); | |
337 | mtspr(SPRN_DAC2, thread->dac2); | |
338 | #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 | |
339 | mtspr(SPRN_DVC1, thread->dvc1); | |
340 | mtspr(SPRN_DVC2, thread->dvc2); | |
341 | #endif | |
342 | mtspr(SPRN_DBCR0, thread->dbcr0); | |
343 | mtspr(SPRN_DBCR1, thread->dbcr1); | |
344 | #ifdef CONFIG_BOOKE | |
345 | mtspr(SPRN_DBCR2, thread->dbcr2); | |
346 | #endif | |
347 | } | |
348 | /* | |
349 | * Unless neither the old or new thread are making use of the | |
350 | * debug registers, set the debug registers from the values | |
351 | * stored in the new thread. | |
352 | */ | |
353 | static void switch_booke_debug_regs(struct thread_struct *new_thread) | |
354 | { | |
355 | if ((current->thread.dbcr0 & DBCR0_IDM) | |
356 | || (new_thread->dbcr0 & DBCR0_IDM)) | |
357 | prime_debug_regs(new_thread); | |
358 | } | |
359 | #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ | |
e0780b72 | 360 | #ifndef CONFIG_HAVE_HW_BREAKPOINT |
3bffb652 DK |
361 | static void set_debug_reg_defaults(struct thread_struct *thread) |
362 | { | |
363 | if (thread->dabr) { | |
364 | thread->dabr = 0; | |
365 | set_dabr(0); | |
366 | } | |
367 | } | |
e0780b72 | 368 | #endif /* !CONFIG_HAVE_HW_BREAKPOINT */ |
3bffb652 DK |
369 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ |
370 | ||
14cf11af PM |
371 | int set_dabr(unsigned long dabr) |
372 | { | |
a2ceff5e ME |
373 | __get_cpu_var(current_dabr) = dabr; |
374 | ||
cab0af98 ME |
375 | if (ppc_md.set_dabr) |
376 | return ppc_md.set_dabr(dabr); | |
14cf11af | 377 | |
791cc501 | 378 | /* XXX should we have a CPU_FTR_HAS_DABR ? */ |
172ae2e7 | 379 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
d6a61bfc | 380 | mtspr(SPRN_DAC1, dabr); |
221c185d DK |
381 | #ifdef CONFIG_PPC_47x |
382 | isync(); | |
383 | #endif | |
c6c9eace BH |
384 | #elif defined(CONFIG_PPC_BOOK3S) |
385 | mtspr(SPRN_DABR, dabr); | |
d6a61bfc LM |
386 | #endif |
387 | ||
c6c9eace | 388 | |
cab0af98 | 389 | return 0; |
14cf11af PM |
390 | } |
391 | ||
06d67d54 PM |
392 | #ifdef CONFIG_PPC64 |
393 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
06d67d54 | 394 | #endif |
14cf11af PM |
395 | |
396 | struct task_struct *__switch_to(struct task_struct *prev, | |
397 | struct task_struct *new) | |
398 | { | |
399 | struct thread_struct *new_thread, *old_thread; | |
400 | unsigned long flags; | |
401 | struct task_struct *last; | |
d6bf29b4 PZ |
402 | #ifdef CONFIG_PPC_BOOK3S_64 |
403 | struct ppc64_tlb_batch *batch; | |
404 | #endif | |
14cf11af PM |
405 | |
406 | #ifdef CONFIG_SMP | |
407 | /* avoid complexity of lazy save/restore of fpu | |
408 | * by just saving it every time we switch out if | |
409 | * this task used the fpu during the last quantum. | |
410 | * | |
411 | * If it tries to use the fpu again, it'll trap and | |
412 | * reload its fp regs. So we don't have to do a restore | |
413 | * every switch, just a save. | |
414 | * -- Cort | |
415 | */ | |
416 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) | |
417 | giveup_fpu(prev); | |
418 | #ifdef CONFIG_ALTIVEC | |
419 | /* | |
420 | * If the previous thread used altivec in the last quantum | |
421 | * (thus changing altivec regs) then save them. | |
422 | * We used to check the VRSAVE register but not all apps | |
423 | * set it, so we don't rely on it now (and in fact we need | |
424 | * to save & restore VSCR even if VRSAVE == 0). -- paulus | |
425 | * | |
426 | * On SMP we always save/restore altivec regs just to avoid the | |
427 | * complexity of changing processors. | |
428 | * -- Cort | |
429 | */ | |
430 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) | |
431 | giveup_altivec(prev); | |
14cf11af | 432 | #endif /* CONFIG_ALTIVEC */ |
ce48b210 MN |
433 | #ifdef CONFIG_VSX |
434 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VSX)) | |
7c292170 MN |
435 | /* VMX and FPU registers are already save here */ |
436 | __giveup_vsx(prev); | |
ce48b210 | 437 | #endif /* CONFIG_VSX */ |
14cf11af PM |
438 | #ifdef CONFIG_SPE |
439 | /* | |
440 | * If the previous thread used spe in the last quantum | |
441 | * (thus changing spe regs) then save them. | |
442 | * | |
443 | * On SMP we always save/restore spe regs just to avoid the | |
444 | * complexity of changing processors. | |
445 | */ | |
446 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) | |
447 | giveup_spe(prev); | |
c0c0d996 PM |
448 | #endif /* CONFIG_SPE */ |
449 | ||
450 | #else /* CONFIG_SMP */ | |
451 | #ifdef CONFIG_ALTIVEC | |
452 | /* Avoid the trap. On smp this this never happens since | |
453 | * we don't set last_task_used_altivec -- Cort | |
454 | */ | |
455 | if (new->thread.regs && last_task_used_altivec == new) | |
456 | new->thread.regs->msr |= MSR_VEC; | |
457 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
458 | #ifdef CONFIG_VSX |
459 | if (new->thread.regs && last_task_used_vsx == new) | |
460 | new->thread.regs->msr |= MSR_VSX; | |
461 | #endif /* CONFIG_VSX */ | |
c0c0d996 | 462 | #ifdef CONFIG_SPE |
14cf11af PM |
463 | /* Avoid the trap. On smp this this never happens since |
464 | * we don't set last_task_used_spe | |
465 | */ | |
466 | if (new->thread.regs && last_task_used_spe == new) | |
467 | new->thread.regs->msr |= MSR_SPE; | |
468 | #endif /* CONFIG_SPE */ | |
c0c0d996 | 469 | |
14cf11af PM |
470 | #endif /* CONFIG_SMP */ |
471 | ||
172ae2e7 | 472 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
3bffb652 | 473 | switch_booke_debug_regs(&new->thread); |
c6c9eace | 474 | #else |
5aae8a53 P |
475 | /* |
476 | * For PPC_BOOK3S_64, we use the hw-breakpoint interfaces that would | |
477 | * schedule DABR | |
478 | */ | |
479 | #ifndef CONFIG_HAVE_HW_BREAKPOINT | |
c6c9eace BH |
480 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) |
481 | set_dabr(new->thread.dabr); | |
5aae8a53 | 482 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ |
d6a61bfc LM |
483 | #endif |
484 | ||
c6c9eace | 485 | |
14cf11af PM |
486 | new_thread = &new->thread; |
487 | old_thread = ¤t->thread; | |
06d67d54 PM |
488 | |
489 | #ifdef CONFIG_PPC64 | |
490 | /* | |
491 | * Collect processor utilization data per process | |
492 | */ | |
493 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
494 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); | |
495 | long unsigned start_tb, current_tb; | |
496 | start_tb = old_thread->start_tb; | |
497 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
498 | old_thread->accum_tb += (current_tb - start_tb); | |
499 | new_thread->start_tb = current_tb; | |
500 | } | |
d6bf29b4 PZ |
501 | #endif /* CONFIG_PPC64 */ |
502 | ||
503 | #ifdef CONFIG_PPC_BOOK3S_64 | |
504 | batch = &__get_cpu_var(ppc64_tlb_batch); | |
505 | if (batch->active) { | |
506 | current_thread_info()->local_flags |= _TLF_LAZY_MMU; | |
507 | if (batch->index) | |
508 | __flush_tlb_pending(batch); | |
509 | batch->active = 0; | |
510 | } | |
511 | #endif /* CONFIG_PPC_BOOK3S_64 */ | |
06d67d54 | 512 | |
14cf11af | 513 | local_irq_save(flags); |
c6622f63 PM |
514 | |
515 | account_system_vtime(current); | |
81a3843f | 516 | account_process_vtime(current); |
c6622f63 | 517 | |
44387e9f AB |
518 | /* |
519 | * We can't take a PMU exception inside _switch() since there is a | |
520 | * window where the kernel stack SLB and the kernel stack are out | |
521 | * of sync. Hard disable here. | |
522 | */ | |
523 | hard_irq_disable(); | |
14cf11af PM |
524 | last = _switch(old_thread, new_thread); |
525 | ||
d6bf29b4 PZ |
526 | #ifdef CONFIG_PPC_BOOK3S_64 |
527 | if (current_thread_info()->local_flags & _TLF_LAZY_MMU) { | |
528 | current_thread_info()->local_flags &= ~_TLF_LAZY_MMU; | |
529 | batch = &__get_cpu_var(ppc64_tlb_batch); | |
530 | batch->active = 1; | |
531 | } | |
532 | #endif /* CONFIG_PPC_BOOK3S_64 */ | |
533 | ||
14cf11af PM |
534 | local_irq_restore(flags); |
535 | ||
536 | return last; | |
537 | } | |
538 | ||
06d67d54 PM |
539 | static int instructions_to_print = 16; |
540 | ||
06d67d54 PM |
541 | static void show_instructions(struct pt_regs *regs) |
542 | { | |
543 | int i; | |
544 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
545 | sizeof(int)); | |
546 | ||
547 | printk("Instruction dump:"); | |
548 | ||
549 | for (i = 0; i < instructions_to_print; i++) { | |
550 | int instr; | |
551 | ||
552 | if (!(i % 8)) | |
553 | printk("\n"); | |
554 | ||
0de2d820 SW |
555 | #if !defined(CONFIG_BOOKE) |
556 | /* If executing with the IMMU off, adjust pc rather | |
557 | * than print XXXXXXXX. | |
558 | */ | |
559 | if (!(regs->msr & MSR_IR)) | |
560 | pc = (unsigned long)phys_to_virt(pc); | |
561 | #endif | |
562 | ||
af308377 SR |
563 | /* We use __get_user here *only* to avoid an OOPS on a |
564 | * bad address because the pc *should* only be a | |
565 | * kernel address. | |
566 | */ | |
00ae36de AB |
567 | if (!__kernel_text_address(pc) || |
568 | __get_user(instr, (unsigned int __user *)pc)) { | |
40c8cefa | 569 | printk(KERN_CONT "XXXXXXXX "); |
06d67d54 PM |
570 | } else { |
571 | if (regs->nip == pc) | |
40c8cefa | 572 | printk(KERN_CONT "<%08x> ", instr); |
06d67d54 | 573 | else |
40c8cefa | 574 | printk(KERN_CONT "%08x ", instr); |
06d67d54 PM |
575 | } |
576 | ||
577 | pc += sizeof(int); | |
578 | } | |
579 | ||
580 | printk("\n"); | |
581 | } | |
582 | ||
583 | static struct regbit { | |
584 | unsigned long bit; | |
585 | const char *name; | |
586 | } msr_bits[] = { | |
3bfd0c9c AB |
587 | #if defined(CONFIG_PPC64) && !defined(CONFIG_BOOKE) |
588 | {MSR_SF, "SF"}, | |
589 | {MSR_HV, "HV"}, | |
590 | #endif | |
591 | {MSR_VEC, "VEC"}, | |
592 | {MSR_VSX, "VSX"}, | |
593 | #ifdef CONFIG_BOOKE | |
594 | {MSR_CE, "CE"}, | |
595 | #endif | |
06d67d54 PM |
596 | {MSR_EE, "EE"}, |
597 | {MSR_PR, "PR"}, | |
598 | {MSR_FP, "FP"}, | |
599 | {MSR_ME, "ME"}, | |
3bfd0c9c | 600 | #ifdef CONFIG_BOOKE |
1b98326b | 601 | {MSR_DE, "DE"}, |
3bfd0c9c AB |
602 | #else |
603 | {MSR_SE, "SE"}, | |
604 | {MSR_BE, "BE"}, | |
605 | #endif | |
06d67d54 PM |
606 | {MSR_IR, "IR"}, |
607 | {MSR_DR, "DR"}, | |
3bfd0c9c AB |
608 | {MSR_PMM, "PMM"}, |
609 | #ifndef CONFIG_BOOKE | |
610 | {MSR_RI, "RI"}, | |
611 | {MSR_LE, "LE"}, | |
612 | #endif | |
06d67d54 PM |
613 | {0, NULL} |
614 | }; | |
615 | ||
616 | static void printbits(unsigned long val, struct regbit *bits) | |
617 | { | |
618 | const char *sep = ""; | |
619 | ||
620 | printk("<"); | |
621 | for (; bits->bit; ++bits) | |
622 | if (val & bits->bit) { | |
623 | printk("%s%s", sep, bits->name); | |
624 | sep = ","; | |
625 | } | |
626 | printk(">"); | |
627 | } | |
628 | ||
629 | #ifdef CONFIG_PPC64 | |
f6f7dde3 | 630 | #define REG "%016lx" |
06d67d54 PM |
631 | #define REGS_PER_LINE 4 |
632 | #define LAST_VOLATILE 13 | |
633 | #else | |
f6f7dde3 | 634 | #define REG "%08lx" |
06d67d54 PM |
635 | #define REGS_PER_LINE 8 |
636 | #define LAST_VOLATILE 12 | |
637 | #endif | |
638 | ||
14cf11af PM |
639 | void show_regs(struct pt_regs * regs) |
640 | { | |
641 | int i, trap; | |
642 | ||
06d67d54 PM |
643 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
644 | regs->nip, regs->link, regs->ctr); | |
645 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
96b644bd | 646 | regs, regs->trap, print_tainted(), init_utsname()->release); |
06d67d54 PM |
647 | printk("MSR: "REG" ", regs->msr); |
648 | printbits(regs->msr, msr_bits); | |
f6f7dde3 | 649 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); |
14cf11af | 650 | trap = TRAP(regs); |
5115a026 MN |
651 | if ((regs->trap != 0xc00) && cpu_has_feature(CPU_FTR_CFAR)) |
652 | printk("CFAR: "REG"\n", regs->orig_gpr3); | |
14cf11af | 653 | if (trap == 0x300 || trap == 0x600) |
ba28c9aa | 654 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
14170789 KG |
655 | printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr); |
656 | #else | |
7071854b | 657 | printk("DAR: "REG", DSISR: %08lx\n", regs->dar, regs->dsisr); |
14170789 | 658 | #endif |
06d67d54 | 659 | printk("TASK = %p[%d] '%s' THREAD: %p", |
19c5870c | 660 | current, task_pid_nr(current), current->comm, task_thread_info(current)); |
14cf11af PM |
661 | |
662 | #ifdef CONFIG_SMP | |
79ccd1be | 663 | printk(" CPU: %d", raw_smp_processor_id()); |
14cf11af PM |
664 | #endif /* CONFIG_SMP */ |
665 | ||
666 | for (i = 0; i < 32; i++) { | |
06d67d54 | 667 | if ((i % REGS_PER_LINE) == 0) |
a2367194 | 668 | printk("\nGPR%02d: ", i); |
06d67d54 PM |
669 | printk(REG " ", regs->gpr[i]); |
670 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
671 | break; |
672 | } | |
673 | printk("\n"); | |
674 | #ifdef CONFIG_KALLSYMS | |
675 | /* | |
676 | * Lookup NIP late so we have the best change of getting the | |
677 | * above info out without failing | |
678 | */ | |
058c78f4 BH |
679 | printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip); |
680 | printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link); | |
14cf11af PM |
681 | #endif |
682 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
683 | if (!user_mode(regs)) |
684 | show_instructions(regs); | |
14cf11af PM |
685 | } |
686 | ||
687 | void exit_thread(void) | |
688 | { | |
48abec07 | 689 | discard_lazy_cpu_state(); |
14cf11af PM |
690 | } |
691 | ||
692 | void flush_thread(void) | |
693 | { | |
48abec07 | 694 | discard_lazy_cpu_state(); |
14cf11af | 695 | |
e0780b72 | 696 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
5aae8a53 | 697 | flush_ptrace_hw_breakpoint(current); |
e0780b72 | 698 | #else /* CONFIG_HAVE_HW_BREAKPOINT */ |
3bffb652 | 699 | set_debug_reg_defaults(¤t->thread); |
e0780b72 | 700 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ |
14cf11af PM |
701 | } |
702 | ||
703 | void | |
704 | release_thread(struct task_struct *t) | |
705 | { | |
706 | } | |
707 | ||
708 | /* | |
709 | * This gets called before we allocate a new thread and copy | |
710 | * the current task into it. | |
711 | */ | |
712 | void prepare_to_copy(struct task_struct *tsk) | |
713 | { | |
714 | flush_fp_to_thread(current); | |
715 | flush_altivec_to_thread(current); | |
ce48b210 | 716 | flush_vsx_to_thread(current); |
14cf11af | 717 | flush_spe_to_thread(current); |
5aae8a53 P |
718 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
719 | flush_ptrace_hw_breakpoint(tsk); | |
720 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ | |
14cf11af PM |
721 | } |
722 | ||
723 | /* | |
724 | * Copy a thread.. | |
725 | */ | |
efcac658 AK |
726 | extern unsigned long dscr_default; /* defined in arch/powerpc/kernel/sysfs.c */ |
727 | ||
6f2c55b8 | 728 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
06d67d54 PM |
729 | unsigned long unused, struct task_struct *p, |
730 | struct pt_regs *regs) | |
14cf11af PM |
731 | { |
732 | struct pt_regs *childregs, *kregs; | |
733 | extern void ret_from_fork(void); | |
0cec6fd1 | 734 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
735 | |
736 | CHECK_FULL_REGS(regs); | |
737 | /* Copy registers */ | |
738 | sp -= sizeof(struct pt_regs); | |
739 | childregs = (struct pt_regs *) sp; | |
740 | *childregs = *regs; | |
741 | if ((childregs->msr & MSR_PR) == 0) { | |
742 | /* for kernel thread, set `current' and stackptr in new task */ | |
743 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 744 | #ifdef CONFIG_PPC32 |
14cf11af | 745 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 746 | #else |
b5e2fc1c | 747 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 748 | #endif |
14cf11af PM |
749 | p->thread.regs = NULL; /* no user register state */ |
750 | } else { | |
751 | childregs->gpr[1] = usp; | |
752 | p->thread.regs = childregs; | |
06d67d54 PM |
753 | if (clone_flags & CLONE_SETTLS) { |
754 | #ifdef CONFIG_PPC64 | |
9904b005 | 755 | if (!is_32bit_task()) |
06d67d54 PM |
756 | childregs->gpr[13] = childregs->gpr[6]; |
757 | else | |
758 | #endif | |
759 | childregs->gpr[2] = childregs->gpr[6]; | |
760 | } | |
14cf11af PM |
761 | } |
762 | childregs->gpr[3] = 0; /* Result from fork() */ | |
763 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
764 | |
765 | /* | |
766 | * The way this works is that at some point in the future | |
767 | * some task will call _switch to switch to the new task. | |
768 | * That will pop off the stack frame created below and start | |
769 | * the new task running at ret_from_fork. The new task will | |
770 | * do some house keeping and then return from the fork or clone | |
771 | * system call, using the stack frame created above. | |
772 | */ | |
773 | sp -= sizeof(struct pt_regs); | |
774 | kregs = (struct pt_regs *) sp; | |
775 | sp -= STACK_FRAME_OVERHEAD; | |
776 | p->thread.ksp = sp; | |
85218827 KG |
777 | p->thread.ksp_limit = (unsigned long)task_stack_page(p) + |
778 | _ALIGN_UP(sizeof(struct thread_info), 16); | |
14cf11af | 779 | |
94491685 | 780 | #ifdef CONFIG_PPC_STD_MMU_64 |
44ae3ab3 | 781 | if (mmu_has_feature(MMU_FTR_SLB)) { |
1189be65 | 782 | unsigned long sp_vsid; |
3c726f8d | 783 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 | 784 | |
44ae3ab3 | 785 | if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) |
1189be65 PM |
786 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) |
787 | << SLB_VSID_SHIFT_1T; | |
788 | else | |
789 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) | |
790 | << SLB_VSID_SHIFT; | |
3c726f8d | 791 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
792 | p->thread.ksp_vsid = sp_vsid; |
793 | } | |
747bea91 | 794 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
efcac658 AK |
795 | #ifdef CONFIG_PPC64 |
796 | if (cpu_has_feature(CPU_FTR_DSCR)) { | |
797 | if (current->thread.dscr_inherit) { | |
798 | p->thread.dscr_inherit = 1; | |
799 | p->thread.dscr = current->thread.dscr; | |
800 | } else if (0 != dscr_default) { | |
801 | p->thread.dscr_inherit = 1; | |
802 | p->thread.dscr = dscr_default; | |
803 | } else { | |
804 | p->thread.dscr_inherit = 0; | |
805 | p->thread.dscr = 0; | |
806 | } | |
807 | } | |
808 | #endif | |
06d67d54 PM |
809 | |
810 | /* | |
811 | * The PPC64 ABI makes use of a TOC to contain function | |
812 | * pointers. The function (ret_from_except) is actually a pointer | |
813 | * to the TOC entry. The first entry is a pointer to the actual | |
814 | * function. | |
815 | */ | |
747bea91 | 816 | #ifdef CONFIG_PPC64 |
06d67d54 PM |
817 | kregs->nip = *((unsigned long *)ret_from_fork); |
818 | #else | |
819 | kregs->nip = (unsigned long)ret_from_fork; | |
06d67d54 | 820 | #endif |
14cf11af PM |
821 | |
822 | return 0; | |
823 | } | |
824 | ||
825 | /* | |
826 | * Set up a thread for executing a new program | |
827 | */ | |
06d67d54 | 828 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 829 | { |
90eac727 ME |
830 | #ifdef CONFIG_PPC64 |
831 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
832 | #endif | |
833 | ||
06d67d54 PM |
834 | /* |
835 | * If we exec out of a kernel thread then thread.regs will not be | |
836 | * set. Do it now. | |
837 | */ | |
838 | if (!current->thread.regs) { | |
0cec6fd1 AV |
839 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
840 | current->thread.regs = regs - 1; | |
06d67d54 PM |
841 | } |
842 | ||
14cf11af PM |
843 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
844 | regs->ctr = 0; | |
845 | regs->link = 0; | |
846 | regs->xer = 0; | |
847 | regs->ccr = 0; | |
14cf11af | 848 | regs->gpr[1] = sp; |
06d67d54 | 849 | |
474f8196 RM |
850 | /* |
851 | * We have just cleared all the nonvolatile GPRs, so make | |
852 | * FULL_REGS(regs) return true. This is necessary to allow | |
853 | * ptrace to examine the thread immediately after exec. | |
854 | */ | |
855 | regs->trap &= ~1UL; | |
856 | ||
06d67d54 PM |
857 | #ifdef CONFIG_PPC32 |
858 | regs->mq = 0; | |
859 | regs->nip = start; | |
14cf11af | 860 | regs->msr = MSR_USER; |
06d67d54 | 861 | #else |
9904b005 | 862 | if (!is_32bit_task()) { |
90eac727 | 863 | unsigned long entry, toc; |
06d67d54 PM |
864 | |
865 | /* start is a relocated pointer to the function descriptor for | |
866 | * the elf _start routine. The first entry in the function | |
867 | * descriptor is the entry address of _start and the second | |
868 | * entry is the TOC value we need to use. | |
869 | */ | |
870 | __get_user(entry, (unsigned long __user *)start); | |
871 | __get_user(toc, (unsigned long __user *)start+1); | |
872 | ||
873 | /* Check whether the e_entry function descriptor entries | |
874 | * need to be relocated before we can use them. | |
875 | */ | |
876 | if (load_addr != 0) { | |
877 | entry += load_addr; | |
878 | toc += load_addr; | |
879 | } | |
880 | regs->nip = entry; | |
881 | regs->gpr[2] = toc; | |
882 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
883 | } else { |
884 | regs->nip = start; | |
885 | regs->gpr[2] = 0; | |
886 | regs->msr = MSR_USER32; | |
06d67d54 PM |
887 | } |
888 | #endif | |
889 | ||
48abec07 | 890 | discard_lazy_cpu_state(); |
ce48b210 MN |
891 | #ifdef CONFIG_VSX |
892 | current->thread.used_vsr = 0; | |
893 | #endif | |
14cf11af | 894 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 895 | current->thread.fpscr.val = 0; |
14cf11af PM |
896 | #ifdef CONFIG_ALTIVEC |
897 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
898 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 899 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
900 | current->thread.vrsave = 0; |
901 | current->thread.used_vr = 0; | |
902 | #endif /* CONFIG_ALTIVEC */ | |
903 | #ifdef CONFIG_SPE | |
904 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
905 | current->thread.acc = 0; | |
906 | current->thread.spefscr = 0; | |
907 | current->thread.used_spe = 0; | |
908 | #endif /* CONFIG_SPE */ | |
909 | } | |
910 | ||
911 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
912 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
913 | ||
914 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
915 | { | |
916 | struct pt_regs *regs = tsk->thread.regs; | |
917 | ||
918 | /* This is a bit hairy. If we are an SPE enabled processor | |
919 | * (have embedded fp) we store the IEEE exception enable flags in | |
920 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
921 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
922 | if (val & PR_FP_EXC_SW_ENABLE) { | |
923 | #ifdef CONFIG_SPE | |
5e14d21e KG |
924 | if (cpu_has_feature(CPU_FTR_SPE)) { |
925 | tsk->thread.fpexc_mode = val & | |
926 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
927 | return 0; | |
928 | } else { | |
929 | return -EINVAL; | |
930 | } | |
14cf11af PM |
931 | #else |
932 | return -EINVAL; | |
933 | #endif | |
14cf11af | 934 | } |
06d67d54 PM |
935 | |
936 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
937 | * __pack_fe01 use do not overlap with bits used for | |
938 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
939 | * on CONFIG_SPE implementations are reserved so writing to | |
940 | * them does not change anything */ | |
941 | if (val > PR_FP_EXC_PRECISE) | |
942 | return -EINVAL; | |
943 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
944 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
945 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
946 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
947 | return 0; |
948 | } | |
949 | ||
950 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
951 | { | |
952 | unsigned int val; | |
953 | ||
954 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
955 | #ifdef CONFIG_SPE | |
5e14d21e KG |
956 | if (cpu_has_feature(CPU_FTR_SPE)) |
957 | val = tsk->thread.fpexc_mode; | |
958 | else | |
959 | return -EINVAL; | |
14cf11af PM |
960 | #else |
961 | return -EINVAL; | |
962 | #endif | |
963 | else | |
964 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
965 | return put_user(val, (unsigned int __user *) adr); | |
966 | } | |
967 | ||
fab5db97 PM |
968 | int set_endian(struct task_struct *tsk, unsigned int val) |
969 | { | |
970 | struct pt_regs *regs = tsk->thread.regs; | |
971 | ||
972 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
973 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
974 | return -EINVAL; | |
975 | ||
976 | if (regs == NULL) | |
977 | return -EINVAL; | |
978 | ||
979 | if (val == PR_ENDIAN_BIG) | |
980 | regs->msr &= ~MSR_LE; | |
981 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
982 | regs->msr |= MSR_LE; | |
983 | else | |
984 | return -EINVAL; | |
985 | ||
986 | return 0; | |
987 | } | |
988 | ||
989 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
990 | { | |
991 | struct pt_regs *regs = tsk->thread.regs; | |
992 | unsigned int val; | |
993 | ||
994 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
995 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
996 | return -EINVAL; | |
997 | ||
998 | if (regs == NULL) | |
999 | return -EINVAL; | |
1000 | ||
1001 | if (regs->msr & MSR_LE) { | |
1002 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
1003 | val = PR_ENDIAN_LITTLE; | |
1004 | else | |
1005 | val = PR_ENDIAN_PPC_LITTLE; | |
1006 | } else | |
1007 | val = PR_ENDIAN_BIG; | |
1008 | ||
1009 | return put_user(val, (unsigned int __user *)adr); | |
1010 | } | |
1011 | ||
e9370ae1 PM |
1012 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
1013 | { | |
1014 | tsk->thread.align_ctl = val; | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
1019 | { | |
1020 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
1021 | } | |
1022 | ||
06d67d54 PM |
1023 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
1024 | ||
14cf11af PM |
1025 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
1026 | int __user *parent_tidp, void __user *child_threadptr, | |
1027 | int __user *child_tidp, int p6, | |
1028 | struct pt_regs *regs) | |
1029 | { | |
1030 | CHECK_FULL_REGS(regs); | |
1031 | if (usp == 0) | |
1032 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 | 1033 | #ifdef CONFIG_PPC64 |
9904b005 | 1034 | if (is_32bit_task()) { |
06d67d54 PM |
1035 | parent_tidp = TRUNC_PTR(parent_tidp); |
1036 | child_tidp = TRUNC_PTR(child_tidp); | |
1037 | } | |
1038 | #endif | |
14cf11af PM |
1039 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
1040 | } | |
1041 | ||
1042 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
1043 | unsigned long p4, unsigned long p5, unsigned long p6, | |
1044 | struct pt_regs *regs) | |
1045 | { | |
1046 | CHECK_FULL_REGS(regs); | |
1047 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
1048 | } | |
1049 | ||
1050 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
1051 | unsigned long p4, unsigned long p5, unsigned long p6, | |
1052 | struct pt_regs *regs) | |
1053 | { | |
1054 | CHECK_FULL_REGS(regs); | |
1055 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
1056 | regs, 0, NULL, NULL); | |
1057 | } | |
1058 | ||
1059 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
1060 | unsigned long a3, unsigned long a4, unsigned long a5, | |
1061 | struct pt_regs *regs) | |
1062 | { | |
1063 | int error; | |
06d67d54 | 1064 | char *filename; |
14cf11af | 1065 | |
c7887325 | 1066 | filename = getname((const char __user *) a0); |
14cf11af PM |
1067 | error = PTR_ERR(filename); |
1068 | if (IS_ERR(filename)) | |
1069 | goto out; | |
1070 | flush_fp_to_thread(current); | |
1071 | flush_altivec_to_thread(current); | |
1072 | flush_spe_to_thread(current); | |
d7627467 DH |
1073 | error = do_execve(filename, |
1074 | (const char __user *const __user *) a1, | |
1075 | (const char __user *const __user *) a2, regs); | |
14cf11af PM |
1076 | putname(filename); |
1077 | out: | |
1078 | return error; | |
1079 | } | |
1080 | ||
bb72c481 PM |
1081 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, |
1082 | unsigned long nbytes) | |
1083 | { | |
1084 | unsigned long stack_page; | |
1085 | unsigned long cpu = task_cpu(p); | |
1086 | ||
1087 | /* | |
1088 | * Avoid crashing if the stack has overflowed and corrupted | |
1089 | * task_cpu(p), which is in the thread_info struct. | |
1090 | */ | |
1091 | if (cpu < NR_CPUS && cpu_possible(cpu)) { | |
1092 | stack_page = (unsigned long) hardirq_ctx[cpu]; | |
1093 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1094 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1095 | return 1; | |
1096 | ||
1097 | stack_page = (unsigned long) softirq_ctx[cpu]; | |
1098 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1099 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1100 | return 1; | |
1101 | } | |
1102 | return 0; | |
1103 | } | |
1104 | ||
2f25194d | 1105 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
1106 | unsigned long nbytes) |
1107 | { | |
0cec6fd1 | 1108 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
1109 | |
1110 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1111 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1112 | return 1; | |
1113 | ||
bb72c481 | 1114 | return valid_irq_stack(sp, p, nbytes); |
14cf11af PM |
1115 | } |
1116 | ||
2f25194d AB |
1117 | EXPORT_SYMBOL(validate_sp); |
1118 | ||
14cf11af PM |
1119 | unsigned long get_wchan(struct task_struct *p) |
1120 | { | |
1121 | unsigned long ip, sp; | |
1122 | int count = 0; | |
1123 | ||
1124 | if (!p || p == current || p->state == TASK_RUNNING) | |
1125 | return 0; | |
1126 | ||
1127 | sp = p->thread.ksp; | |
ec2b36b9 | 1128 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
1129 | return 0; |
1130 | ||
1131 | do { | |
1132 | sp = *(unsigned long *)sp; | |
ec2b36b9 | 1133 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
1134 | return 0; |
1135 | if (count > 0) { | |
ec2b36b9 | 1136 | ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE]; |
14cf11af PM |
1137 | if (!in_sched_functions(ip)) |
1138 | return ip; | |
1139 | } | |
1140 | } while (count++ < 16); | |
1141 | return 0; | |
1142 | } | |
06d67d54 | 1143 | |
c4d04be1 | 1144 | static int kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH; |
06d67d54 PM |
1145 | |
1146 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
1147 | { | |
1148 | unsigned long sp, ip, lr, newsp; | |
1149 | int count = 0; | |
1150 | int firstframe = 1; | |
6794c782 SR |
1151 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1152 | int curr_frame = current->curr_ret_stack; | |
1153 | extern void return_to_handler(void); | |
9135c3cc SR |
1154 | unsigned long rth = (unsigned long)return_to_handler; |
1155 | unsigned long mrth = -1; | |
6794c782 | 1156 | #ifdef CONFIG_PPC64 |
9135c3cc SR |
1157 | extern void mod_return_to_handler(void); |
1158 | rth = *(unsigned long *)rth; | |
1159 | mrth = (unsigned long)mod_return_to_handler; | |
1160 | mrth = *(unsigned long *)mrth; | |
6794c782 SR |
1161 | #endif |
1162 | #endif | |
06d67d54 PM |
1163 | |
1164 | sp = (unsigned long) stack; | |
1165 | if (tsk == NULL) | |
1166 | tsk = current; | |
1167 | if (sp == 0) { | |
1168 | if (tsk == current) | |
1169 | asm("mr %0,1" : "=r" (sp)); | |
1170 | else | |
1171 | sp = tsk->thread.ksp; | |
1172 | } | |
1173 | ||
1174 | lr = 0; | |
1175 | printk("Call Trace:\n"); | |
1176 | do { | |
ec2b36b9 | 1177 | if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) |
06d67d54 PM |
1178 | return; |
1179 | ||
1180 | stack = (unsigned long *) sp; | |
1181 | newsp = stack[0]; | |
ec2b36b9 | 1182 | ip = stack[STACK_FRAME_LR_SAVE]; |
06d67d54 | 1183 | if (!firstframe || ip != lr) { |
058c78f4 | 1184 | printk("["REG"] ["REG"] %pS", sp, ip, (void *)ip); |
6794c782 | 1185 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
9135c3cc | 1186 | if ((ip == rth || ip == mrth) && curr_frame >= 0) { |
6794c782 SR |
1187 | printk(" (%pS)", |
1188 | (void *)current->ret_stack[curr_frame].ret); | |
1189 | curr_frame--; | |
1190 | } | |
1191 | #endif | |
06d67d54 PM |
1192 | if (firstframe) |
1193 | printk(" (unreliable)"); | |
1194 | printk("\n"); | |
1195 | } | |
1196 | firstframe = 0; | |
1197 | ||
1198 | /* | |
1199 | * See if this is an exception frame. | |
1200 | * We look for the "regshere" marker in the current frame. | |
1201 | */ | |
ec2b36b9 BH |
1202 | if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) |
1203 | && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { | |
06d67d54 PM |
1204 | struct pt_regs *regs = (struct pt_regs *) |
1205 | (sp + STACK_FRAME_OVERHEAD); | |
06d67d54 | 1206 | lr = regs->link; |
058c78f4 BH |
1207 | printk("--- Exception: %lx at %pS\n LR = %pS\n", |
1208 | regs->trap, (void *)regs->nip, (void *)lr); | |
06d67d54 PM |
1209 | firstframe = 1; |
1210 | } | |
1211 | ||
1212 | sp = newsp; | |
1213 | } while (count++ < kstack_depth_to_print); | |
1214 | } | |
1215 | ||
1216 | void dump_stack(void) | |
1217 | { | |
1218 | show_stack(current, NULL); | |
1219 | } | |
1220 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
1221 | |
1222 | #ifdef CONFIG_PPC64 | |
1223 | void ppc64_runlatch_on(void) | |
1224 | { | |
1225 | unsigned long ctrl; | |
1226 | ||
1227 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
1228 | HMT_medium(); | |
1229 | ||
1230 | ctrl = mfspr(SPRN_CTRLF); | |
1231 | ctrl |= CTRL_RUNLATCH; | |
1232 | mtspr(SPRN_CTRLT, ctrl); | |
1233 | ||
1234 | set_thread_flag(TIF_RUNLATCH); | |
1235 | } | |
1236 | } | |
1237 | ||
4138d653 | 1238 | void __ppc64_runlatch_off(void) |
cb2c9b27 AB |
1239 | { |
1240 | unsigned long ctrl; | |
1241 | ||
4138d653 | 1242 | HMT_medium(); |
cb2c9b27 | 1243 | |
4138d653 | 1244 | clear_thread_flag(TIF_RUNLATCH); |
cb2c9b27 | 1245 | |
4138d653 AB |
1246 | ctrl = mfspr(SPRN_CTRLF); |
1247 | ctrl &= ~CTRL_RUNLATCH; | |
1248 | mtspr(SPRN_CTRLT, ctrl); | |
cb2c9b27 AB |
1249 | } |
1250 | #endif | |
f6a61680 BH |
1251 | |
1252 | #if THREAD_SHIFT < PAGE_SHIFT | |
1253 | ||
1254 | static struct kmem_cache *thread_info_cache; | |
1255 | ||
b6a84016 | 1256 | struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node) |
f6a61680 BH |
1257 | { |
1258 | struct thread_info *ti; | |
1259 | ||
b6a84016 | 1260 | ti = kmem_cache_alloc_node(thread_info_cache, GFP_KERNEL, node); |
f6a61680 BH |
1261 | if (unlikely(ti == NULL)) |
1262 | return NULL; | |
1263 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
1264 | memset(ti, 0, THREAD_SIZE); | |
1265 | #endif | |
1266 | return ti; | |
1267 | } | |
1268 | ||
1269 | void free_thread_info(struct thread_info *ti) | |
1270 | { | |
1271 | kmem_cache_free(thread_info_cache, ti); | |
1272 | } | |
1273 | ||
1274 | void thread_info_cache_init(void) | |
1275 | { | |
1276 | thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, | |
1277 | THREAD_SIZE, 0, NULL); | |
1278 | BUG_ON(thread_info_cache == NULL); | |
1279 | } | |
1280 | ||
1281 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ | |
d839088c AB |
1282 | |
1283 | unsigned long arch_align_stack(unsigned long sp) | |
1284 | { | |
1285 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) | |
1286 | sp -= get_random_int() & ~PAGE_MASK; | |
1287 | return sp & ~0xf; | |
1288 | } | |
912f9ee2 AB |
1289 | |
1290 | static inline unsigned long brk_rnd(void) | |
1291 | { | |
1292 | unsigned long rnd = 0; | |
1293 | ||
1294 | /* 8MB for 32bit, 1GB for 64bit */ | |
1295 | if (is_32bit_task()) | |
1296 | rnd = (long)(get_random_int() % (1<<(23-PAGE_SHIFT))); | |
1297 | else | |
1298 | rnd = (long)(get_random_int() % (1<<(30-PAGE_SHIFT))); | |
1299 | ||
1300 | return rnd << PAGE_SHIFT; | |
1301 | } | |
1302 | ||
1303 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
1304 | { | |
8bbde7a7 AB |
1305 | unsigned long base = mm->brk; |
1306 | unsigned long ret; | |
1307 | ||
ce7a35c7 | 1308 | #ifdef CONFIG_PPC_STD_MMU_64 |
8bbde7a7 AB |
1309 | /* |
1310 | * If we are using 1TB segments and we are allowed to randomise | |
1311 | * the heap, we can put it above 1TB so it is backed by a 1TB | |
1312 | * segment. Otherwise the heap will be in the bottom 1TB | |
1313 | * which always uses 256MB segments and this may result in a | |
1314 | * performance penalty. | |
1315 | */ | |
1316 | if (!is_32bit_task() && (mmu_highuser_ssize == MMU_SEGSIZE_1T)) | |
1317 | base = max_t(unsigned long, mm->brk, 1UL << SID_SHIFT_1T); | |
1318 | #endif | |
1319 | ||
1320 | ret = PAGE_ALIGN(base + brk_rnd()); | |
912f9ee2 AB |
1321 | |
1322 | if (ret < mm->brk) | |
1323 | return mm->brk; | |
1324 | ||
1325 | return ret; | |
1326 | } | |
501cb16d AB |
1327 | |
1328 | unsigned long randomize_et_dyn(unsigned long base) | |
1329 | { | |
1330 | unsigned long ret = PAGE_ALIGN(base + brk_rnd()); | |
1331 | ||
1332 | if (ret < base) | |
1333 | return base; | |
1334 | ||
1335 | return ret; | |
1336 | } |