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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> | |
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> | |
14cf11af PM |
44 | #include <asm/io.h> |
45 | #include <asm/processor.h> | |
46 | #include <asm/mmu.h> | |
47 | #include <asm/prom.h> | |
76032de8 | 48 | #include <asm/machdep.h> |
c6622f63 | 49 | #include <asm/time.h> |
ae3a197e | 50 | #include <asm/runlatch.h> |
a7f31841 | 51 | #include <asm/syscalls.h> |
ae3a197e DH |
52 | #include <asm/switch_to.h> |
53 | #include <asm/debug.h> | |
06d67d54 PM |
54 | #ifdef CONFIG_PPC64 |
55 | #include <asm/firmware.h> | |
06d67d54 | 56 | #endif |
d6a61bfc LM |
57 | #include <linux/kprobes.h> |
58 | #include <linux/kdebug.h> | |
14cf11af PM |
59 | |
60 | extern unsigned long _get_SP(void); | |
61 | ||
62 | #ifndef CONFIG_SMP | |
63 | struct task_struct *last_task_used_math = NULL; | |
64 | struct task_struct *last_task_used_altivec = NULL; | |
ce48b210 | 65 | struct task_struct *last_task_used_vsx = NULL; |
14cf11af PM |
66 | struct task_struct *last_task_used_spe = NULL; |
67 | #endif | |
68 | ||
14cf11af PM |
69 | /* |
70 | * Make sure the floating-point register state in the | |
71 | * the thread_struct is up to date for task tsk. | |
72 | */ | |
73 | void flush_fp_to_thread(struct task_struct *tsk) | |
74 | { | |
75 | if (tsk->thread.regs) { | |
76 | /* | |
77 | * We need to disable preemption here because if we didn't, | |
78 | * another process could get scheduled after the regs->msr | |
79 | * test but before we have finished saving the FP registers | |
80 | * to the thread_struct. That process could take over the | |
81 | * FPU, and then when we get scheduled again we would store | |
82 | * bogus values for the remaining FP registers. | |
83 | */ | |
84 | preempt_disable(); | |
85 | if (tsk->thread.regs->msr & MSR_FP) { | |
86 | #ifdef CONFIG_SMP | |
87 | /* | |
88 | * This should only ever be called for current or | |
89 | * for a stopped child process. Since we save away | |
90 | * the FP register state on context switch on SMP, | |
91 | * there is something wrong if a stopped child appears | |
92 | * to still have its FP state in the CPU registers. | |
93 | */ | |
94 | BUG_ON(tsk != current); | |
95 | #endif | |
0ee6c15e | 96 | giveup_fpu(tsk); |
14cf11af PM |
97 | } |
98 | preempt_enable(); | |
99 | } | |
100 | } | |
de56a948 | 101 | EXPORT_SYMBOL_GPL(flush_fp_to_thread); |
14cf11af PM |
102 | |
103 | void enable_kernel_fp(void) | |
104 | { | |
105 | WARN_ON(preemptible()); | |
106 | ||
107 | #ifdef CONFIG_SMP | |
108 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) | |
109 | giveup_fpu(current); | |
110 | else | |
111 | giveup_fpu(NULL); /* just enables FP for kernel */ | |
112 | #else | |
113 | giveup_fpu(last_task_used_math); | |
114 | #endif /* CONFIG_SMP */ | |
115 | } | |
116 | EXPORT_SYMBOL(enable_kernel_fp); | |
117 | ||
14cf11af PM |
118 | #ifdef CONFIG_ALTIVEC |
119 | void enable_kernel_altivec(void) | |
120 | { | |
121 | WARN_ON(preemptible()); | |
122 | ||
123 | #ifdef CONFIG_SMP | |
124 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) | |
125 | giveup_altivec(current); | |
126 | else | |
127 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ | |
128 | #else | |
129 | giveup_altivec(last_task_used_altivec); | |
130 | #endif /* CONFIG_SMP */ | |
131 | } | |
132 | EXPORT_SYMBOL(enable_kernel_altivec); | |
133 | ||
134 | /* | |
135 | * Make sure the VMX/Altivec register state in the | |
136 | * the thread_struct is up to date for task tsk. | |
137 | */ | |
138 | void flush_altivec_to_thread(struct task_struct *tsk) | |
139 | { | |
140 | if (tsk->thread.regs) { | |
141 | preempt_disable(); | |
142 | if (tsk->thread.regs->msr & MSR_VEC) { | |
143 | #ifdef CONFIG_SMP | |
144 | BUG_ON(tsk != current); | |
145 | #endif | |
0ee6c15e | 146 | giveup_altivec(tsk); |
14cf11af PM |
147 | } |
148 | preempt_enable(); | |
149 | } | |
150 | } | |
de56a948 | 151 | EXPORT_SYMBOL_GPL(flush_altivec_to_thread); |
14cf11af PM |
152 | #endif /* CONFIG_ALTIVEC */ |
153 | ||
ce48b210 MN |
154 | #ifdef CONFIG_VSX |
155 | #if 0 | |
156 | /* not currently used, but some crazy RAID module might want to later */ | |
157 | void enable_kernel_vsx(void) | |
158 | { | |
159 | WARN_ON(preemptible()); | |
160 | ||
161 | #ifdef CONFIG_SMP | |
162 | if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) | |
163 | giveup_vsx(current); | |
164 | else | |
165 | giveup_vsx(NULL); /* just enable vsx for kernel - force */ | |
166 | #else | |
167 | giveup_vsx(last_task_used_vsx); | |
168 | #endif /* CONFIG_SMP */ | |
169 | } | |
170 | EXPORT_SYMBOL(enable_kernel_vsx); | |
171 | #endif | |
172 | ||
7c292170 MN |
173 | void giveup_vsx(struct task_struct *tsk) |
174 | { | |
175 | giveup_fpu(tsk); | |
176 | giveup_altivec(tsk); | |
177 | __giveup_vsx(tsk); | |
178 | } | |
179 | ||
ce48b210 MN |
180 | void flush_vsx_to_thread(struct task_struct *tsk) |
181 | { | |
182 | if (tsk->thread.regs) { | |
183 | preempt_disable(); | |
184 | if (tsk->thread.regs->msr & MSR_VSX) { | |
185 | #ifdef CONFIG_SMP | |
186 | BUG_ON(tsk != current); | |
187 | #endif | |
188 | giveup_vsx(tsk); | |
189 | } | |
190 | preempt_enable(); | |
191 | } | |
192 | } | |
de56a948 | 193 | EXPORT_SYMBOL_GPL(flush_vsx_to_thread); |
ce48b210 MN |
194 | #endif /* CONFIG_VSX */ |
195 | ||
14cf11af PM |
196 | #ifdef CONFIG_SPE |
197 | ||
198 | void enable_kernel_spe(void) | |
199 | { | |
200 | WARN_ON(preemptible()); | |
201 | ||
202 | #ifdef CONFIG_SMP | |
203 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) | |
204 | giveup_spe(current); | |
205 | else | |
206 | giveup_spe(NULL); /* just enable SPE for kernel - force */ | |
207 | #else | |
208 | giveup_spe(last_task_used_spe); | |
209 | #endif /* __SMP __ */ | |
210 | } | |
211 | EXPORT_SYMBOL(enable_kernel_spe); | |
212 | ||
213 | void flush_spe_to_thread(struct task_struct *tsk) | |
214 | { | |
215 | if (tsk->thread.regs) { | |
216 | preempt_disable(); | |
217 | if (tsk->thread.regs->msr & MSR_SPE) { | |
218 | #ifdef CONFIG_SMP | |
219 | BUG_ON(tsk != current); | |
220 | #endif | |
685659ee | 221 | tsk->thread.spefscr = mfspr(SPRN_SPEFSCR); |
0ee6c15e | 222 | giveup_spe(tsk); |
14cf11af PM |
223 | } |
224 | preempt_enable(); | |
225 | } | |
226 | } | |
14cf11af PM |
227 | #endif /* CONFIG_SPE */ |
228 | ||
5388fb10 | 229 | #ifndef CONFIG_SMP |
48abec07 PM |
230 | /* |
231 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), | |
232 | * and the current task has some state, discard it. | |
233 | */ | |
5388fb10 | 234 | void discard_lazy_cpu_state(void) |
48abec07 | 235 | { |
48abec07 PM |
236 | preempt_disable(); |
237 | if (last_task_used_math == current) | |
238 | last_task_used_math = NULL; | |
239 | #ifdef CONFIG_ALTIVEC | |
240 | if (last_task_used_altivec == current) | |
241 | last_task_used_altivec = NULL; | |
242 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
243 | #ifdef CONFIG_VSX |
244 | if (last_task_used_vsx == current) | |
245 | last_task_used_vsx = NULL; | |
246 | #endif /* CONFIG_VSX */ | |
48abec07 PM |
247 | #ifdef CONFIG_SPE |
248 | if (last_task_used_spe == current) | |
249 | last_task_used_spe = NULL; | |
250 | #endif | |
251 | preempt_enable(); | |
48abec07 | 252 | } |
5388fb10 | 253 | #endif /* CONFIG_SMP */ |
48abec07 | 254 | |
3bffb652 DK |
255 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
256 | void do_send_trap(struct pt_regs *regs, unsigned long address, | |
257 | unsigned long error_code, int signal_code, int breakpt) | |
258 | { | |
259 | siginfo_t info; | |
260 | ||
261 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
262 | 11, SIGSEGV) == NOTIFY_STOP) | |
263 | return; | |
264 | ||
265 | /* Deliver the signal to userspace */ | |
266 | info.si_signo = SIGTRAP; | |
267 | info.si_errno = breakpt; /* breakpoint or watchpoint id */ | |
268 | info.si_code = signal_code; | |
269 | info.si_addr = (void __user *)address; | |
270 | force_sig_info(SIGTRAP, &info, current); | |
271 | } | |
272 | #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ | |
d6a61bfc LM |
273 | void do_dabr(struct pt_regs *regs, unsigned long address, |
274 | unsigned long error_code) | |
275 | { | |
276 | siginfo_t info; | |
277 | ||
278 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
279 | 11, SIGSEGV) == NOTIFY_STOP) | |
280 | return; | |
281 | ||
282 | if (debugger_dabr_match(regs)) | |
283 | return; | |
284 | ||
d6a61bfc LM |
285 | /* Clear the DABR */ |
286 | set_dabr(0); | |
287 | ||
288 | /* Deliver the signal to userspace */ | |
289 | info.si_signo = SIGTRAP; | |
290 | info.si_errno = 0; | |
291 | info.si_code = TRAP_HWBKPT; | |
292 | info.si_addr = (void __user *)address; | |
293 | force_sig_info(SIGTRAP, &info, current); | |
294 | } | |
3bffb652 | 295 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ |
d6a61bfc | 296 | |
a2ceff5e ME |
297 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
298 | ||
3bffb652 DK |
299 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
300 | /* | |
301 | * Set the debug registers back to their default "safe" values. | |
302 | */ | |
303 | static void set_debug_reg_defaults(struct thread_struct *thread) | |
304 | { | |
305 | thread->iac1 = thread->iac2 = 0; | |
306 | #if CONFIG_PPC_ADV_DEBUG_IACS > 2 | |
307 | thread->iac3 = thread->iac4 = 0; | |
308 | #endif | |
309 | thread->dac1 = thread->dac2 = 0; | |
310 | #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 | |
311 | thread->dvc1 = thread->dvc2 = 0; | |
312 | #endif | |
313 | thread->dbcr0 = 0; | |
314 | #ifdef CONFIG_BOOKE | |
315 | /* | |
316 | * Force User/Supervisor bits to b11 (user-only MSR[PR]=1) | |
317 | */ | |
318 | thread->dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | \ | |
319 | DBCR1_IAC3US | DBCR1_IAC4US; | |
320 | /* | |
321 | * Force Data Address Compare User/Supervisor bits to be User-only | |
322 | * (0b11 MSR[PR]=1) and set all other bits in DBCR2 register to be 0. | |
323 | */ | |
324 | thread->dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US; | |
325 | #else | |
326 | thread->dbcr1 = 0; | |
327 | #endif | |
328 | } | |
329 | ||
330 | static void prime_debug_regs(struct thread_struct *thread) | |
331 | { | |
332 | mtspr(SPRN_IAC1, thread->iac1); | |
333 | mtspr(SPRN_IAC2, thread->iac2); | |
334 | #if CONFIG_PPC_ADV_DEBUG_IACS > 2 | |
335 | mtspr(SPRN_IAC3, thread->iac3); | |
336 | mtspr(SPRN_IAC4, thread->iac4); | |
337 | #endif | |
338 | mtspr(SPRN_DAC1, thread->dac1); | |
339 | mtspr(SPRN_DAC2, thread->dac2); | |
340 | #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 | |
341 | mtspr(SPRN_DVC1, thread->dvc1); | |
342 | mtspr(SPRN_DVC2, thread->dvc2); | |
343 | #endif | |
344 | mtspr(SPRN_DBCR0, thread->dbcr0); | |
345 | mtspr(SPRN_DBCR1, thread->dbcr1); | |
346 | #ifdef CONFIG_BOOKE | |
347 | mtspr(SPRN_DBCR2, thread->dbcr2); | |
348 | #endif | |
349 | } | |
350 | /* | |
351 | * Unless neither the old or new thread are making use of the | |
352 | * debug registers, set the debug registers from the values | |
353 | * stored in the new thread. | |
354 | */ | |
355 | static void switch_booke_debug_regs(struct thread_struct *new_thread) | |
356 | { | |
357 | if ((current->thread.dbcr0 & DBCR0_IDM) | |
358 | || (new_thread->dbcr0 & DBCR0_IDM)) | |
359 | prime_debug_regs(new_thread); | |
360 | } | |
361 | #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ | |
e0780b72 | 362 | #ifndef CONFIG_HAVE_HW_BREAKPOINT |
3bffb652 DK |
363 | static void set_debug_reg_defaults(struct thread_struct *thread) |
364 | { | |
365 | if (thread->dabr) { | |
366 | thread->dabr = 0; | |
367 | set_dabr(0); | |
368 | } | |
369 | } | |
e0780b72 | 370 | #endif /* !CONFIG_HAVE_HW_BREAKPOINT */ |
3bffb652 DK |
371 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ |
372 | ||
14cf11af PM |
373 | int set_dabr(unsigned long dabr) |
374 | { | |
a2ceff5e ME |
375 | __get_cpu_var(current_dabr) = dabr; |
376 | ||
cab0af98 ME |
377 | if (ppc_md.set_dabr) |
378 | return ppc_md.set_dabr(dabr); | |
14cf11af | 379 | |
791cc501 | 380 | /* XXX should we have a CPU_FTR_HAS_DABR ? */ |
172ae2e7 | 381 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
d6a61bfc | 382 | mtspr(SPRN_DAC1, dabr); |
221c185d DK |
383 | #ifdef CONFIG_PPC_47x |
384 | isync(); | |
385 | #endif | |
c6c9eace BH |
386 | #elif defined(CONFIG_PPC_BOOK3S) |
387 | mtspr(SPRN_DABR, dabr); | |
d6a61bfc LM |
388 | #endif |
389 | ||
c6c9eace | 390 | |
cab0af98 | 391 | return 0; |
14cf11af PM |
392 | } |
393 | ||
06d67d54 PM |
394 | #ifdef CONFIG_PPC64 |
395 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
06d67d54 | 396 | #endif |
14cf11af PM |
397 | |
398 | struct task_struct *__switch_to(struct task_struct *prev, | |
399 | struct task_struct *new) | |
400 | { | |
401 | struct thread_struct *new_thread, *old_thread; | |
402 | unsigned long flags; | |
403 | struct task_struct *last; | |
d6bf29b4 PZ |
404 | #ifdef CONFIG_PPC_BOOK3S_64 |
405 | struct ppc64_tlb_batch *batch; | |
406 | #endif | |
14cf11af PM |
407 | |
408 | #ifdef CONFIG_SMP | |
409 | /* avoid complexity of lazy save/restore of fpu | |
410 | * by just saving it every time we switch out if | |
411 | * this task used the fpu during the last quantum. | |
412 | * | |
413 | * If it tries to use the fpu again, it'll trap and | |
414 | * reload its fp regs. So we don't have to do a restore | |
415 | * every switch, just a save. | |
416 | * -- Cort | |
417 | */ | |
418 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) | |
419 | giveup_fpu(prev); | |
420 | #ifdef CONFIG_ALTIVEC | |
421 | /* | |
422 | * If the previous thread used altivec in the last quantum | |
423 | * (thus changing altivec regs) then save them. | |
424 | * We used to check the VRSAVE register but not all apps | |
425 | * set it, so we don't rely on it now (and in fact we need | |
426 | * to save & restore VSCR even if VRSAVE == 0). -- paulus | |
427 | * | |
428 | * On SMP we always save/restore altivec regs just to avoid the | |
429 | * complexity of changing processors. | |
430 | * -- Cort | |
431 | */ | |
432 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) | |
433 | giveup_altivec(prev); | |
14cf11af | 434 | #endif /* CONFIG_ALTIVEC */ |
ce48b210 MN |
435 | #ifdef CONFIG_VSX |
436 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VSX)) | |
7c292170 MN |
437 | /* VMX and FPU registers are already save here */ |
438 | __giveup_vsx(prev); | |
ce48b210 | 439 | #endif /* CONFIG_VSX */ |
14cf11af PM |
440 | #ifdef CONFIG_SPE |
441 | /* | |
442 | * If the previous thread used spe in the last quantum | |
443 | * (thus changing spe regs) then save them. | |
444 | * | |
445 | * On SMP we always save/restore spe regs just to avoid the | |
446 | * complexity of changing processors. | |
447 | */ | |
448 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) | |
449 | giveup_spe(prev); | |
c0c0d996 PM |
450 | #endif /* CONFIG_SPE */ |
451 | ||
452 | #else /* CONFIG_SMP */ | |
453 | #ifdef CONFIG_ALTIVEC | |
454 | /* Avoid the trap. On smp this this never happens since | |
455 | * we don't set last_task_used_altivec -- Cort | |
456 | */ | |
457 | if (new->thread.regs && last_task_used_altivec == new) | |
458 | new->thread.regs->msr |= MSR_VEC; | |
459 | #endif /* CONFIG_ALTIVEC */ | |
ce48b210 MN |
460 | #ifdef CONFIG_VSX |
461 | if (new->thread.regs && last_task_used_vsx == new) | |
462 | new->thread.regs->msr |= MSR_VSX; | |
463 | #endif /* CONFIG_VSX */ | |
c0c0d996 | 464 | #ifdef CONFIG_SPE |
14cf11af PM |
465 | /* Avoid the trap. On smp this this never happens since |
466 | * we don't set last_task_used_spe | |
467 | */ | |
468 | if (new->thread.regs && last_task_used_spe == new) | |
469 | new->thread.regs->msr |= MSR_SPE; | |
470 | #endif /* CONFIG_SPE */ | |
c0c0d996 | 471 | |
14cf11af PM |
472 | #endif /* CONFIG_SMP */ |
473 | ||
172ae2e7 | 474 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
3bffb652 | 475 | switch_booke_debug_regs(&new->thread); |
c6c9eace | 476 | #else |
5aae8a53 P |
477 | /* |
478 | * For PPC_BOOK3S_64, we use the hw-breakpoint interfaces that would | |
479 | * schedule DABR | |
480 | */ | |
481 | #ifndef CONFIG_HAVE_HW_BREAKPOINT | |
c6c9eace BH |
482 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) |
483 | set_dabr(new->thread.dabr); | |
5aae8a53 | 484 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ |
d6a61bfc LM |
485 | #endif |
486 | ||
c6c9eace | 487 | |
14cf11af PM |
488 | new_thread = &new->thread; |
489 | old_thread = ¤t->thread; | |
06d67d54 PM |
490 | |
491 | #ifdef CONFIG_PPC64 | |
492 | /* | |
493 | * Collect processor utilization data per process | |
494 | */ | |
495 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
496 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); | |
497 | long unsigned start_tb, current_tb; | |
498 | start_tb = old_thread->start_tb; | |
499 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
500 | old_thread->accum_tb += (current_tb - start_tb); | |
501 | new_thread->start_tb = current_tb; | |
502 | } | |
d6bf29b4 PZ |
503 | #endif /* CONFIG_PPC64 */ |
504 | ||
505 | #ifdef CONFIG_PPC_BOOK3S_64 | |
506 | batch = &__get_cpu_var(ppc64_tlb_batch); | |
507 | if (batch->active) { | |
508 | current_thread_info()->local_flags |= _TLF_LAZY_MMU; | |
509 | if (batch->index) | |
510 | __flush_tlb_pending(batch); | |
511 | batch->active = 0; | |
512 | } | |
513 | #endif /* CONFIG_PPC_BOOK3S_64 */ | |
06d67d54 | 514 | |
14cf11af | 515 | local_irq_save(flags); |
c6622f63 PM |
516 | |
517 | account_system_vtime(current); | |
81a3843f | 518 | account_process_vtime(current); |
c6622f63 | 519 | |
44387e9f AB |
520 | /* |
521 | * We can't take a PMU exception inside _switch() since there is a | |
522 | * window where the kernel stack SLB and the kernel stack are out | |
523 | * of sync. Hard disable here. | |
524 | */ | |
525 | hard_irq_disable(); | |
14cf11af PM |
526 | last = _switch(old_thread, new_thread); |
527 | ||
d6bf29b4 PZ |
528 | #ifdef CONFIG_PPC_BOOK3S_64 |
529 | if (current_thread_info()->local_flags & _TLF_LAZY_MMU) { | |
530 | current_thread_info()->local_flags &= ~_TLF_LAZY_MMU; | |
531 | batch = &__get_cpu_var(ppc64_tlb_batch); | |
532 | batch->active = 1; | |
533 | } | |
534 | #endif /* CONFIG_PPC_BOOK3S_64 */ | |
535 | ||
14cf11af PM |
536 | local_irq_restore(flags); |
537 | ||
538 | return last; | |
539 | } | |
540 | ||
06d67d54 PM |
541 | static int instructions_to_print = 16; |
542 | ||
06d67d54 PM |
543 | static void show_instructions(struct pt_regs *regs) |
544 | { | |
545 | int i; | |
546 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
547 | sizeof(int)); | |
548 | ||
549 | printk("Instruction dump:"); | |
550 | ||
551 | for (i = 0; i < instructions_to_print; i++) { | |
552 | int instr; | |
553 | ||
554 | if (!(i % 8)) | |
555 | printk("\n"); | |
556 | ||
0de2d820 SW |
557 | #if !defined(CONFIG_BOOKE) |
558 | /* If executing with the IMMU off, adjust pc rather | |
559 | * than print XXXXXXXX. | |
560 | */ | |
561 | if (!(regs->msr & MSR_IR)) | |
562 | pc = (unsigned long)phys_to_virt(pc); | |
563 | #endif | |
564 | ||
af308377 SR |
565 | /* We use __get_user here *only* to avoid an OOPS on a |
566 | * bad address because the pc *should* only be a | |
567 | * kernel address. | |
568 | */ | |
00ae36de AB |
569 | if (!__kernel_text_address(pc) || |
570 | __get_user(instr, (unsigned int __user *)pc)) { | |
40c8cefa | 571 | printk(KERN_CONT "XXXXXXXX "); |
06d67d54 PM |
572 | } else { |
573 | if (regs->nip == pc) | |
40c8cefa | 574 | printk(KERN_CONT "<%08x> ", instr); |
06d67d54 | 575 | else |
40c8cefa | 576 | printk(KERN_CONT "%08x ", instr); |
06d67d54 PM |
577 | } |
578 | ||
579 | pc += sizeof(int); | |
580 | } | |
581 | ||
582 | printk("\n"); | |
583 | } | |
584 | ||
585 | static struct regbit { | |
586 | unsigned long bit; | |
587 | const char *name; | |
588 | } msr_bits[] = { | |
3bfd0c9c AB |
589 | #if defined(CONFIG_PPC64) && !defined(CONFIG_BOOKE) |
590 | {MSR_SF, "SF"}, | |
591 | {MSR_HV, "HV"}, | |
592 | #endif | |
593 | {MSR_VEC, "VEC"}, | |
594 | {MSR_VSX, "VSX"}, | |
595 | #ifdef CONFIG_BOOKE | |
596 | {MSR_CE, "CE"}, | |
597 | #endif | |
06d67d54 PM |
598 | {MSR_EE, "EE"}, |
599 | {MSR_PR, "PR"}, | |
600 | {MSR_FP, "FP"}, | |
601 | {MSR_ME, "ME"}, | |
3bfd0c9c | 602 | #ifdef CONFIG_BOOKE |
1b98326b | 603 | {MSR_DE, "DE"}, |
3bfd0c9c AB |
604 | #else |
605 | {MSR_SE, "SE"}, | |
606 | {MSR_BE, "BE"}, | |
607 | #endif | |
06d67d54 PM |
608 | {MSR_IR, "IR"}, |
609 | {MSR_DR, "DR"}, | |
3bfd0c9c AB |
610 | {MSR_PMM, "PMM"}, |
611 | #ifndef CONFIG_BOOKE | |
612 | {MSR_RI, "RI"}, | |
613 | {MSR_LE, "LE"}, | |
614 | #endif | |
06d67d54 PM |
615 | {0, NULL} |
616 | }; | |
617 | ||
618 | static void printbits(unsigned long val, struct regbit *bits) | |
619 | { | |
620 | const char *sep = ""; | |
621 | ||
622 | printk("<"); | |
623 | for (; bits->bit; ++bits) | |
624 | if (val & bits->bit) { | |
625 | printk("%s%s", sep, bits->name); | |
626 | sep = ","; | |
627 | } | |
628 | printk(">"); | |
629 | } | |
630 | ||
631 | #ifdef CONFIG_PPC64 | |
f6f7dde3 | 632 | #define REG "%016lx" |
06d67d54 PM |
633 | #define REGS_PER_LINE 4 |
634 | #define LAST_VOLATILE 13 | |
635 | #else | |
f6f7dde3 | 636 | #define REG "%08lx" |
06d67d54 PM |
637 | #define REGS_PER_LINE 8 |
638 | #define LAST_VOLATILE 12 | |
639 | #endif | |
640 | ||
14cf11af PM |
641 | void show_regs(struct pt_regs * regs) |
642 | { | |
643 | int i, trap; | |
644 | ||
06d67d54 PM |
645 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
646 | regs->nip, regs->link, regs->ctr); | |
647 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
96b644bd | 648 | regs, regs->trap, print_tainted(), init_utsname()->release); |
06d67d54 PM |
649 | printk("MSR: "REG" ", regs->msr); |
650 | printbits(regs->msr, msr_bits); | |
f6f7dde3 | 651 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); |
7230c564 BH |
652 | #ifdef CONFIG_PPC64 |
653 | printk("SOFTE: %ld\n", regs->softe); | |
654 | #endif | |
14cf11af | 655 | trap = TRAP(regs); |
5115a026 MN |
656 | if ((regs->trap != 0xc00) && cpu_has_feature(CPU_FTR_CFAR)) |
657 | printk("CFAR: "REG"\n", regs->orig_gpr3); | |
14cf11af | 658 | if (trap == 0x300 || trap == 0x600) |
ba28c9aa | 659 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
14170789 KG |
660 | printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr); |
661 | #else | |
7071854b | 662 | printk("DAR: "REG", DSISR: %08lx\n", regs->dar, regs->dsisr); |
14170789 | 663 | #endif |
06d67d54 | 664 | printk("TASK = %p[%d] '%s' THREAD: %p", |
19c5870c | 665 | current, task_pid_nr(current), current->comm, task_thread_info(current)); |
14cf11af PM |
666 | |
667 | #ifdef CONFIG_SMP | |
79ccd1be | 668 | printk(" CPU: %d", raw_smp_processor_id()); |
14cf11af PM |
669 | #endif /* CONFIG_SMP */ |
670 | ||
671 | for (i = 0; i < 32; i++) { | |
06d67d54 | 672 | if ((i % REGS_PER_LINE) == 0) |
a2367194 | 673 | printk("\nGPR%02d: ", i); |
06d67d54 PM |
674 | printk(REG " ", regs->gpr[i]); |
675 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
676 | break; |
677 | } | |
678 | printk("\n"); | |
679 | #ifdef CONFIG_KALLSYMS | |
680 | /* | |
681 | * Lookup NIP late so we have the best change of getting the | |
682 | * above info out without failing | |
683 | */ | |
058c78f4 BH |
684 | printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip); |
685 | printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link); | |
14cf11af PM |
686 | #endif |
687 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
688 | if (!user_mode(regs)) |
689 | show_instructions(regs); | |
14cf11af PM |
690 | } |
691 | ||
692 | void exit_thread(void) | |
693 | { | |
48abec07 | 694 | discard_lazy_cpu_state(); |
14cf11af PM |
695 | } |
696 | ||
697 | void flush_thread(void) | |
698 | { | |
48abec07 | 699 | discard_lazy_cpu_state(); |
14cf11af | 700 | |
e0780b72 | 701 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
5aae8a53 | 702 | flush_ptrace_hw_breakpoint(current); |
e0780b72 | 703 | #else /* CONFIG_HAVE_HW_BREAKPOINT */ |
3bffb652 | 704 | set_debug_reg_defaults(¤t->thread); |
e0780b72 | 705 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ |
14cf11af PM |
706 | } |
707 | ||
708 | void | |
709 | release_thread(struct task_struct *t) | |
710 | { | |
711 | } | |
712 | ||
713 | /* | |
714 | * This gets called before we allocate a new thread and copy | |
715 | * the current task into it. | |
716 | */ | |
717 | void prepare_to_copy(struct task_struct *tsk) | |
718 | { | |
719 | flush_fp_to_thread(current); | |
720 | flush_altivec_to_thread(current); | |
ce48b210 | 721 | flush_vsx_to_thread(current); |
14cf11af | 722 | flush_spe_to_thread(current); |
5aae8a53 P |
723 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
724 | flush_ptrace_hw_breakpoint(tsk); | |
725 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ | |
14cf11af PM |
726 | } |
727 | ||
728 | /* | |
729 | * Copy a thread.. | |
730 | */ | |
efcac658 AK |
731 | extern unsigned long dscr_default; /* defined in arch/powerpc/kernel/sysfs.c */ |
732 | ||
6f2c55b8 | 733 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
06d67d54 PM |
734 | unsigned long unused, struct task_struct *p, |
735 | struct pt_regs *regs) | |
14cf11af PM |
736 | { |
737 | struct pt_regs *childregs, *kregs; | |
738 | extern void ret_from_fork(void); | |
0cec6fd1 | 739 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
740 | |
741 | CHECK_FULL_REGS(regs); | |
742 | /* Copy registers */ | |
743 | sp -= sizeof(struct pt_regs); | |
744 | childregs = (struct pt_regs *) sp; | |
745 | *childregs = *regs; | |
746 | if ((childregs->msr & MSR_PR) == 0) { | |
747 | /* for kernel thread, set `current' and stackptr in new task */ | |
748 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 749 | #ifdef CONFIG_PPC32 |
14cf11af | 750 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 751 | #else |
b5e2fc1c | 752 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 753 | #endif |
14cf11af PM |
754 | p->thread.regs = NULL; /* no user register state */ |
755 | } else { | |
756 | childregs->gpr[1] = usp; | |
757 | p->thread.regs = childregs; | |
06d67d54 PM |
758 | if (clone_flags & CLONE_SETTLS) { |
759 | #ifdef CONFIG_PPC64 | |
9904b005 | 760 | if (!is_32bit_task()) |
06d67d54 PM |
761 | childregs->gpr[13] = childregs->gpr[6]; |
762 | else | |
763 | #endif | |
764 | childregs->gpr[2] = childregs->gpr[6]; | |
765 | } | |
14cf11af PM |
766 | } |
767 | childregs->gpr[3] = 0; /* Result from fork() */ | |
768 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
769 | |
770 | /* | |
771 | * The way this works is that at some point in the future | |
772 | * some task will call _switch to switch to the new task. | |
773 | * That will pop off the stack frame created below and start | |
774 | * the new task running at ret_from_fork. The new task will | |
775 | * do some house keeping and then return from the fork or clone | |
776 | * system call, using the stack frame created above. | |
777 | */ | |
778 | sp -= sizeof(struct pt_regs); | |
779 | kregs = (struct pt_regs *) sp; | |
780 | sp -= STACK_FRAME_OVERHEAD; | |
781 | p->thread.ksp = sp; | |
85218827 KG |
782 | p->thread.ksp_limit = (unsigned long)task_stack_page(p) + |
783 | _ALIGN_UP(sizeof(struct thread_info), 16); | |
14cf11af | 784 | |
94491685 | 785 | #ifdef CONFIG_PPC_STD_MMU_64 |
44ae3ab3 | 786 | if (mmu_has_feature(MMU_FTR_SLB)) { |
1189be65 | 787 | unsigned long sp_vsid; |
3c726f8d | 788 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 | 789 | |
44ae3ab3 | 790 | if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) |
1189be65 PM |
791 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) |
792 | << SLB_VSID_SHIFT_1T; | |
793 | else | |
794 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) | |
795 | << SLB_VSID_SHIFT; | |
3c726f8d | 796 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
797 | p->thread.ksp_vsid = sp_vsid; |
798 | } | |
747bea91 | 799 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
efcac658 AK |
800 | #ifdef CONFIG_PPC64 |
801 | if (cpu_has_feature(CPU_FTR_DSCR)) { | |
802 | if (current->thread.dscr_inherit) { | |
803 | p->thread.dscr_inherit = 1; | |
804 | p->thread.dscr = current->thread.dscr; | |
805 | } else if (0 != dscr_default) { | |
806 | p->thread.dscr_inherit = 1; | |
807 | p->thread.dscr = dscr_default; | |
808 | } else { | |
809 | p->thread.dscr_inherit = 0; | |
810 | p->thread.dscr = 0; | |
811 | } | |
812 | } | |
813 | #endif | |
06d67d54 PM |
814 | |
815 | /* | |
816 | * The PPC64 ABI makes use of a TOC to contain function | |
817 | * pointers. The function (ret_from_except) is actually a pointer | |
818 | * to the TOC entry. The first entry is a pointer to the actual | |
819 | * function. | |
820 | */ | |
747bea91 | 821 | #ifdef CONFIG_PPC64 |
06d67d54 PM |
822 | kregs->nip = *((unsigned long *)ret_from_fork); |
823 | #else | |
824 | kregs->nip = (unsigned long)ret_from_fork; | |
06d67d54 | 825 | #endif |
14cf11af PM |
826 | |
827 | return 0; | |
828 | } | |
829 | ||
830 | /* | |
831 | * Set up a thread for executing a new program | |
832 | */ | |
06d67d54 | 833 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 834 | { |
90eac727 ME |
835 | #ifdef CONFIG_PPC64 |
836 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
837 | #endif | |
838 | ||
06d67d54 PM |
839 | /* |
840 | * If we exec out of a kernel thread then thread.regs will not be | |
841 | * set. Do it now. | |
842 | */ | |
843 | if (!current->thread.regs) { | |
0cec6fd1 AV |
844 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
845 | current->thread.regs = regs - 1; | |
06d67d54 PM |
846 | } |
847 | ||
14cf11af PM |
848 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
849 | regs->ctr = 0; | |
850 | regs->link = 0; | |
851 | regs->xer = 0; | |
852 | regs->ccr = 0; | |
14cf11af | 853 | regs->gpr[1] = sp; |
06d67d54 | 854 | |
474f8196 RM |
855 | /* |
856 | * We have just cleared all the nonvolatile GPRs, so make | |
857 | * FULL_REGS(regs) return true. This is necessary to allow | |
858 | * ptrace to examine the thread immediately after exec. | |
859 | */ | |
860 | regs->trap &= ~1UL; | |
861 | ||
06d67d54 PM |
862 | #ifdef CONFIG_PPC32 |
863 | regs->mq = 0; | |
864 | regs->nip = start; | |
14cf11af | 865 | regs->msr = MSR_USER; |
06d67d54 | 866 | #else |
9904b005 | 867 | if (!is_32bit_task()) { |
90eac727 | 868 | unsigned long entry, toc; |
06d67d54 PM |
869 | |
870 | /* start is a relocated pointer to the function descriptor for | |
871 | * the elf _start routine. The first entry in the function | |
872 | * descriptor is the entry address of _start and the second | |
873 | * entry is the TOC value we need to use. | |
874 | */ | |
875 | __get_user(entry, (unsigned long __user *)start); | |
876 | __get_user(toc, (unsigned long __user *)start+1); | |
877 | ||
878 | /* Check whether the e_entry function descriptor entries | |
879 | * need to be relocated before we can use them. | |
880 | */ | |
881 | if (load_addr != 0) { | |
882 | entry += load_addr; | |
883 | toc += load_addr; | |
884 | } | |
885 | regs->nip = entry; | |
886 | regs->gpr[2] = toc; | |
887 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
888 | } else { |
889 | regs->nip = start; | |
890 | regs->gpr[2] = 0; | |
891 | regs->msr = MSR_USER32; | |
06d67d54 PM |
892 | } |
893 | #endif | |
894 | ||
48abec07 | 895 | discard_lazy_cpu_state(); |
ce48b210 MN |
896 | #ifdef CONFIG_VSX |
897 | current->thread.used_vsr = 0; | |
898 | #endif | |
14cf11af | 899 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 900 | current->thread.fpscr.val = 0; |
14cf11af PM |
901 | #ifdef CONFIG_ALTIVEC |
902 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
903 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 904 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
905 | current->thread.vrsave = 0; |
906 | current->thread.used_vr = 0; | |
907 | #endif /* CONFIG_ALTIVEC */ | |
908 | #ifdef CONFIG_SPE | |
909 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
910 | current->thread.acc = 0; | |
911 | current->thread.spefscr = 0; | |
912 | current->thread.used_spe = 0; | |
913 | #endif /* CONFIG_SPE */ | |
914 | } | |
915 | ||
916 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
917 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
918 | ||
919 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
920 | { | |
921 | struct pt_regs *regs = tsk->thread.regs; | |
922 | ||
923 | /* This is a bit hairy. If we are an SPE enabled processor | |
924 | * (have embedded fp) we store the IEEE exception enable flags in | |
925 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
926 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
927 | if (val & PR_FP_EXC_SW_ENABLE) { | |
928 | #ifdef CONFIG_SPE | |
5e14d21e KG |
929 | if (cpu_has_feature(CPU_FTR_SPE)) { |
930 | tsk->thread.fpexc_mode = val & | |
931 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
932 | return 0; | |
933 | } else { | |
934 | return -EINVAL; | |
935 | } | |
14cf11af PM |
936 | #else |
937 | return -EINVAL; | |
938 | #endif | |
14cf11af | 939 | } |
06d67d54 PM |
940 | |
941 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
942 | * __pack_fe01 use do not overlap with bits used for | |
943 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
944 | * on CONFIG_SPE implementations are reserved so writing to | |
945 | * them does not change anything */ | |
946 | if (val > PR_FP_EXC_PRECISE) | |
947 | return -EINVAL; | |
948 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
949 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
950 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
951 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
952 | return 0; |
953 | } | |
954 | ||
955 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
956 | { | |
957 | unsigned int val; | |
958 | ||
959 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
960 | #ifdef CONFIG_SPE | |
5e14d21e KG |
961 | if (cpu_has_feature(CPU_FTR_SPE)) |
962 | val = tsk->thread.fpexc_mode; | |
963 | else | |
964 | return -EINVAL; | |
14cf11af PM |
965 | #else |
966 | return -EINVAL; | |
967 | #endif | |
968 | else | |
969 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
970 | return put_user(val, (unsigned int __user *) adr); | |
971 | } | |
972 | ||
fab5db97 PM |
973 | int set_endian(struct task_struct *tsk, unsigned int val) |
974 | { | |
975 | struct pt_regs *regs = tsk->thread.regs; | |
976 | ||
977 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
978 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
979 | return -EINVAL; | |
980 | ||
981 | if (regs == NULL) | |
982 | return -EINVAL; | |
983 | ||
984 | if (val == PR_ENDIAN_BIG) | |
985 | regs->msr &= ~MSR_LE; | |
986 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
987 | regs->msr |= MSR_LE; | |
988 | else | |
989 | return -EINVAL; | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
994 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
995 | { | |
996 | struct pt_regs *regs = tsk->thread.regs; | |
997 | unsigned int val; | |
998 | ||
999 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
1000 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
1001 | return -EINVAL; | |
1002 | ||
1003 | if (regs == NULL) | |
1004 | return -EINVAL; | |
1005 | ||
1006 | if (regs->msr & MSR_LE) { | |
1007 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
1008 | val = PR_ENDIAN_LITTLE; | |
1009 | else | |
1010 | val = PR_ENDIAN_PPC_LITTLE; | |
1011 | } else | |
1012 | val = PR_ENDIAN_BIG; | |
1013 | ||
1014 | return put_user(val, (unsigned int __user *)adr); | |
1015 | } | |
1016 | ||
e9370ae1 PM |
1017 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
1018 | { | |
1019 | tsk->thread.align_ctl = val; | |
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
1024 | { | |
1025 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
1026 | } | |
1027 | ||
06d67d54 PM |
1028 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
1029 | ||
14cf11af PM |
1030 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
1031 | int __user *parent_tidp, void __user *child_threadptr, | |
1032 | int __user *child_tidp, int p6, | |
1033 | struct pt_regs *regs) | |
1034 | { | |
1035 | CHECK_FULL_REGS(regs); | |
1036 | if (usp == 0) | |
1037 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 | 1038 | #ifdef CONFIG_PPC64 |
9904b005 | 1039 | if (is_32bit_task()) { |
06d67d54 PM |
1040 | parent_tidp = TRUNC_PTR(parent_tidp); |
1041 | child_tidp = TRUNC_PTR(child_tidp); | |
1042 | } | |
1043 | #endif | |
14cf11af PM |
1044 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
1045 | } | |
1046 | ||
1047 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
1048 | unsigned long p4, unsigned long p5, unsigned long p6, | |
1049 | struct pt_regs *regs) | |
1050 | { | |
1051 | CHECK_FULL_REGS(regs); | |
1052 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
1053 | } | |
1054 | ||
1055 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
1056 | unsigned long p4, unsigned long p5, unsigned long p6, | |
1057 | struct pt_regs *regs) | |
1058 | { | |
1059 | CHECK_FULL_REGS(regs); | |
1060 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
1061 | regs, 0, NULL, NULL); | |
1062 | } | |
1063 | ||
1064 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
1065 | unsigned long a3, unsigned long a4, unsigned long a5, | |
1066 | struct pt_regs *regs) | |
1067 | { | |
1068 | int error; | |
06d67d54 | 1069 | char *filename; |
14cf11af | 1070 | |
c7887325 | 1071 | filename = getname((const char __user *) a0); |
14cf11af PM |
1072 | error = PTR_ERR(filename); |
1073 | if (IS_ERR(filename)) | |
1074 | goto out; | |
1075 | flush_fp_to_thread(current); | |
1076 | flush_altivec_to_thread(current); | |
1077 | flush_spe_to_thread(current); | |
d7627467 DH |
1078 | error = do_execve(filename, |
1079 | (const char __user *const __user *) a1, | |
1080 | (const char __user *const __user *) a2, regs); | |
14cf11af PM |
1081 | putname(filename); |
1082 | out: | |
1083 | return error; | |
1084 | } | |
1085 | ||
bb72c481 PM |
1086 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, |
1087 | unsigned long nbytes) | |
1088 | { | |
1089 | unsigned long stack_page; | |
1090 | unsigned long cpu = task_cpu(p); | |
1091 | ||
1092 | /* | |
1093 | * Avoid crashing if the stack has overflowed and corrupted | |
1094 | * task_cpu(p), which is in the thread_info struct. | |
1095 | */ | |
1096 | if (cpu < NR_CPUS && cpu_possible(cpu)) { | |
1097 | stack_page = (unsigned long) hardirq_ctx[cpu]; | |
1098 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1099 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1100 | return 1; | |
1101 | ||
1102 | stack_page = (unsigned long) softirq_ctx[cpu]; | |
1103 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1104 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1105 | return 1; | |
1106 | } | |
1107 | return 0; | |
1108 | } | |
1109 | ||
2f25194d | 1110 | int validate_sp(unsigned long sp, struct task_struct *p, |
14cf11af PM |
1111 | unsigned long nbytes) |
1112 | { | |
0cec6fd1 | 1113 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
1114 | |
1115 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1116 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1117 | return 1; | |
1118 | ||
bb72c481 | 1119 | return valid_irq_stack(sp, p, nbytes); |
14cf11af PM |
1120 | } |
1121 | ||
2f25194d AB |
1122 | EXPORT_SYMBOL(validate_sp); |
1123 | ||
14cf11af PM |
1124 | unsigned long get_wchan(struct task_struct *p) |
1125 | { | |
1126 | unsigned long ip, sp; | |
1127 | int count = 0; | |
1128 | ||
1129 | if (!p || p == current || p->state == TASK_RUNNING) | |
1130 | return 0; | |
1131 | ||
1132 | sp = p->thread.ksp; | |
ec2b36b9 | 1133 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
1134 | return 0; |
1135 | ||
1136 | do { | |
1137 | sp = *(unsigned long *)sp; | |
ec2b36b9 | 1138 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
14cf11af PM |
1139 | return 0; |
1140 | if (count > 0) { | |
ec2b36b9 | 1141 | ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE]; |
14cf11af PM |
1142 | if (!in_sched_functions(ip)) |
1143 | return ip; | |
1144 | } | |
1145 | } while (count++ < 16); | |
1146 | return 0; | |
1147 | } | |
06d67d54 | 1148 | |
c4d04be1 | 1149 | static int kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH; |
06d67d54 PM |
1150 | |
1151 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
1152 | { | |
1153 | unsigned long sp, ip, lr, newsp; | |
1154 | int count = 0; | |
1155 | int firstframe = 1; | |
6794c782 SR |
1156 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1157 | int curr_frame = current->curr_ret_stack; | |
1158 | extern void return_to_handler(void); | |
9135c3cc SR |
1159 | unsigned long rth = (unsigned long)return_to_handler; |
1160 | unsigned long mrth = -1; | |
6794c782 | 1161 | #ifdef CONFIG_PPC64 |
9135c3cc SR |
1162 | extern void mod_return_to_handler(void); |
1163 | rth = *(unsigned long *)rth; | |
1164 | mrth = (unsigned long)mod_return_to_handler; | |
1165 | mrth = *(unsigned long *)mrth; | |
6794c782 SR |
1166 | #endif |
1167 | #endif | |
06d67d54 PM |
1168 | |
1169 | sp = (unsigned long) stack; | |
1170 | if (tsk == NULL) | |
1171 | tsk = current; | |
1172 | if (sp == 0) { | |
1173 | if (tsk == current) | |
1174 | asm("mr %0,1" : "=r" (sp)); | |
1175 | else | |
1176 | sp = tsk->thread.ksp; | |
1177 | } | |
1178 | ||
1179 | lr = 0; | |
1180 | printk("Call Trace:\n"); | |
1181 | do { | |
ec2b36b9 | 1182 | if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) |
06d67d54 PM |
1183 | return; |
1184 | ||
1185 | stack = (unsigned long *) sp; | |
1186 | newsp = stack[0]; | |
ec2b36b9 | 1187 | ip = stack[STACK_FRAME_LR_SAVE]; |
06d67d54 | 1188 | if (!firstframe || ip != lr) { |
058c78f4 | 1189 | printk("["REG"] ["REG"] %pS", sp, ip, (void *)ip); |
6794c782 | 1190 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
9135c3cc | 1191 | if ((ip == rth || ip == mrth) && curr_frame >= 0) { |
6794c782 SR |
1192 | printk(" (%pS)", |
1193 | (void *)current->ret_stack[curr_frame].ret); | |
1194 | curr_frame--; | |
1195 | } | |
1196 | #endif | |
06d67d54 PM |
1197 | if (firstframe) |
1198 | printk(" (unreliable)"); | |
1199 | printk("\n"); | |
1200 | } | |
1201 | firstframe = 0; | |
1202 | ||
1203 | /* | |
1204 | * See if this is an exception frame. | |
1205 | * We look for the "regshere" marker in the current frame. | |
1206 | */ | |
ec2b36b9 BH |
1207 | if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) |
1208 | && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { | |
06d67d54 PM |
1209 | struct pt_regs *regs = (struct pt_regs *) |
1210 | (sp + STACK_FRAME_OVERHEAD); | |
06d67d54 | 1211 | lr = regs->link; |
058c78f4 BH |
1212 | printk("--- Exception: %lx at %pS\n LR = %pS\n", |
1213 | regs->trap, (void *)regs->nip, (void *)lr); | |
06d67d54 PM |
1214 | firstframe = 1; |
1215 | } | |
1216 | ||
1217 | sp = newsp; | |
1218 | } while (count++ < kstack_depth_to_print); | |
1219 | } | |
1220 | ||
1221 | void dump_stack(void) | |
1222 | { | |
1223 | show_stack(current, NULL); | |
1224 | } | |
1225 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
1226 | |
1227 | #ifdef CONFIG_PPC64 | |
fe1952fc BH |
1228 | /* Called with hard IRQs off */ |
1229 | void __ppc64_runlatch_on(void) | |
cb2c9b27 | 1230 | { |
fe1952fc | 1231 | struct thread_info *ti = current_thread_info(); |
cb2c9b27 AB |
1232 | unsigned long ctrl; |
1233 | ||
fe1952fc BH |
1234 | ctrl = mfspr(SPRN_CTRLF); |
1235 | ctrl |= CTRL_RUNLATCH; | |
1236 | mtspr(SPRN_CTRLT, ctrl); | |
cb2c9b27 | 1237 | |
fe1952fc | 1238 | ti->local_flags |= TLF_RUNLATCH; |
cb2c9b27 AB |
1239 | } |
1240 | ||
fe1952fc | 1241 | /* Called with hard IRQs off */ |
4138d653 | 1242 | void __ppc64_runlatch_off(void) |
cb2c9b27 | 1243 | { |
fe1952fc | 1244 | struct thread_info *ti = current_thread_info(); |
cb2c9b27 AB |
1245 | unsigned long ctrl; |
1246 | ||
fe1952fc | 1247 | ti->local_flags &= ~TLF_RUNLATCH; |
cb2c9b27 | 1248 | |
4138d653 AB |
1249 | ctrl = mfspr(SPRN_CTRLF); |
1250 | ctrl &= ~CTRL_RUNLATCH; | |
1251 | mtspr(SPRN_CTRLT, ctrl); | |
cb2c9b27 | 1252 | } |
fe1952fc | 1253 | #endif /* CONFIG_PPC64 */ |
f6a61680 BH |
1254 | |
1255 | #if THREAD_SHIFT < PAGE_SHIFT | |
1256 | ||
1257 | static struct kmem_cache *thread_info_cache; | |
1258 | ||
b6a84016 | 1259 | struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node) |
f6a61680 BH |
1260 | { |
1261 | struct thread_info *ti; | |
1262 | ||
b6a84016 | 1263 | ti = kmem_cache_alloc_node(thread_info_cache, GFP_KERNEL, node); |
f6a61680 BH |
1264 | if (unlikely(ti == NULL)) |
1265 | return NULL; | |
1266 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
1267 | memset(ti, 0, THREAD_SIZE); | |
1268 | #endif | |
1269 | return ti; | |
1270 | } | |
1271 | ||
1272 | void free_thread_info(struct thread_info *ti) | |
1273 | { | |
1274 | kmem_cache_free(thread_info_cache, ti); | |
1275 | } | |
1276 | ||
1277 | void thread_info_cache_init(void) | |
1278 | { | |
1279 | thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, | |
1280 | THREAD_SIZE, 0, NULL); | |
1281 | BUG_ON(thread_info_cache == NULL); | |
1282 | } | |
1283 | ||
1284 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ | |
d839088c AB |
1285 | |
1286 | unsigned long arch_align_stack(unsigned long sp) | |
1287 | { | |
1288 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) | |
1289 | sp -= get_random_int() & ~PAGE_MASK; | |
1290 | return sp & ~0xf; | |
1291 | } | |
912f9ee2 AB |
1292 | |
1293 | static inline unsigned long brk_rnd(void) | |
1294 | { | |
1295 | unsigned long rnd = 0; | |
1296 | ||
1297 | /* 8MB for 32bit, 1GB for 64bit */ | |
1298 | if (is_32bit_task()) | |
1299 | rnd = (long)(get_random_int() % (1<<(23-PAGE_SHIFT))); | |
1300 | else | |
1301 | rnd = (long)(get_random_int() % (1<<(30-PAGE_SHIFT))); | |
1302 | ||
1303 | return rnd << PAGE_SHIFT; | |
1304 | } | |
1305 | ||
1306 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
1307 | { | |
8bbde7a7 AB |
1308 | unsigned long base = mm->brk; |
1309 | unsigned long ret; | |
1310 | ||
ce7a35c7 | 1311 | #ifdef CONFIG_PPC_STD_MMU_64 |
8bbde7a7 AB |
1312 | /* |
1313 | * If we are using 1TB segments and we are allowed to randomise | |
1314 | * the heap, we can put it above 1TB so it is backed by a 1TB | |
1315 | * segment. Otherwise the heap will be in the bottom 1TB | |
1316 | * which always uses 256MB segments and this may result in a | |
1317 | * performance penalty. | |
1318 | */ | |
1319 | if (!is_32bit_task() && (mmu_highuser_ssize == MMU_SEGSIZE_1T)) | |
1320 | base = max_t(unsigned long, mm->brk, 1UL << SID_SHIFT_1T); | |
1321 | #endif | |
1322 | ||
1323 | ret = PAGE_ALIGN(base + brk_rnd()); | |
912f9ee2 AB |
1324 | |
1325 | if (ret < mm->brk) | |
1326 | return mm->brk; | |
1327 | ||
1328 | return ret; | |
1329 | } | |
501cb16d AB |
1330 | |
1331 | unsigned long randomize_et_dyn(unsigned long base) | |
1332 | { | |
1333 | unsigned long ret = PAGE_ALIGN(base + brk_rnd()); | |
1334 | ||
1335 | if (ret < base) | |
1336 | return base; | |
1337 | ||
1338 | return ret; | |
1339 | } |