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1 | /* | |
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 | ||
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> | |
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/prctl.h> | |
29 | #include <linux/init_task.h> | |
30 | #include <linux/export.h> | |
31 | #include <linux/kallsyms.h> | |
32 | #include <linux/mqueue.h> | |
33 | #include <linux/hardirq.h> | |
34 | #include <linux/utsname.h> | |
35 | #include <linux/ftrace.h> | |
36 | #include <linux/kernel_stat.h> | |
37 | #include <linux/personality.h> | |
38 | #include <linux/random.h> | |
39 | #include <linux/hw_breakpoint.h> | |
40 | #include <linux/uaccess.h> | |
41 | ||
42 | #include <asm/pgtable.h> | |
43 | #include <asm/io.h> | |
44 | #include <asm/processor.h> | |
45 | #include <asm/mmu.h> | |
46 | #include <asm/prom.h> | |
47 | #include <asm/machdep.h> | |
48 | #include <asm/time.h> | |
49 | #include <asm/runlatch.h> | |
50 | #include <asm/syscalls.h> | |
51 | #include <asm/switch_to.h> | |
52 | #include <asm/tm.h> | |
53 | #include <asm/debug.h> | |
54 | #ifdef CONFIG_PPC64 | |
55 | #include <asm/firmware.h> | |
56 | #endif | |
57 | #include <asm/code-patching.h> | |
58 | #include <linux/kprobes.h> | |
59 | #include <linux/kdebug.h> | |
60 | ||
61 | /* Transactional Memory debug */ | |
62 | #ifdef TM_DEBUG_SW | |
63 | #define TM_DEBUG(x...) printk(KERN_INFO x) | |
64 | #else | |
65 | #define TM_DEBUG(x...) do { } while(0) | |
66 | #endif | |
67 | ||
68 | extern unsigned long _get_SP(void); | |
69 | ||
70 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
71 | static void check_if_tm_restore_required(struct task_struct *tsk) | |
72 | { | |
73 | /* | |
74 | * If we are saving the current thread's registers, and the | |
75 | * thread is in a transactional state, set the TIF_RESTORE_TM | |
76 | * bit so that we know to restore the registers before | |
77 | * returning to userspace. | |
78 | */ | |
79 | if (tsk == current && tsk->thread.regs && | |
80 | MSR_TM_ACTIVE(tsk->thread.regs->msr) && | |
81 | !test_thread_flag(TIF_RESTORE_TM)) { | |
82 | tsk->thread.ckpt_regs.msr = tsk->thread.regs->msr; | |
83 | set_thread_flag(TIF_RESTORE_TM); | |
84 | } | |
85 | } | |
86 | #else | |
87 | static inline void check_if_tm_restore_required(struct task_struct *tsk) { } | |
88 | #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ | |
89 | ||
90 | bool strict_msr_control; | |
91 | EXPORT_SYMBOL(strict_msr_control); | |
92 | ||
93 | static int __init enable_strict_msr_control(char *str) | |
94 | { | |
95 | strict_msr_control = true; | |
96 | pr_info("Enabling strict facility control\n"); | |
97 | ||
98 | return 0; | |
99 | } | |
100 | early_param("ppc_strict_facility_enable", enable_strict_msr_control); | |
101 | ||
102 | void msr_check_and_set(unsigned long bits) | |
103 | { | |
104 | unsigned long oldmsr = mfmsr(); | |
105 | unsigned long newmsr; | |
106 | ||
107 | newmsr = oldmsr | bits; | |
108 | ||
109 | #ifdef CONFIG_VSX | |
110 | if (cpu_has_feature(CPU_FTR_VSX) && (bits & MSR_FP)) | |
111 | newmsr |= MSR_VSX; | |
112 | #endif | |
113 | ||
114 | if (oldmsr != newmsr) | |
115 | mtmsr_isync(newmsr); | |
116 | } | |
117 | ||
118 | void __msr_check_and_clear(unsigned long bits) | |
119 | { | |
120 | unsigned long oldmsr = mfmsr(); | |
121 | unsigned long newmsr; | |
122 | ||
123 | newmsr = oldmsr & ~bits; | |
124 | ||
125 | #ifdef CONFIG_VSX | |
126 | if (cpu_has_feature(CPU_FTR_VSX) && (bits & MSR_FP)) | |
127 | newmsr &= ~MSR_VSX; | |
128 | #endif | |
129 | ||
130 | if (oldmsr != newmsr) | |
131 | mtmsr_isync(newmsr); | |
132 | } | |
133 | EXPORT_SYMBOL(__msr_check_and_clear); | |
134 | ||
135 | #ifdef CONFIG_PPC_FPU | |
136 | void giveup_fpu(struct task_struct *tsk) | |
137 | { | |
138 | check_if_tm_restore_required(tsk); | |
139 | ||
140 | msr_check_and_set(MSR_FP); | |
141 | __giveup_fpu(tsk); | |
142 | msr_check_and_clear(MSR_FP); | |
143 | } | |
144 | EXPORT_SYMBOL(giveup_fpu); | |
145 | ||
146 | /* | |
147 | * Make sure the floating-point register state in the | |
148 | * the thread_struct is up to date for task tsk. | |
149 | */ | |
150 | void flush_fp_to_thread(struct task_struct *tsk) | |
151 | { | |
152 | if (tsk->thread.regs) { | |
153 | /* | |
154 | * We need to disable preemption here because if we didn't, | |
155 | * another process could get scheduled after the regs->msr | |
156 | * test but before we have finished saving the FP registers | |
157 | * to the thread_struct. That process could take over the | |
158 | * FPU, and then when we get scheduled again we would store | |
159 | * bogus values for the remaining FP registers. | |
160 | */ | |
161 | preempt_disable(); | |
162 | if (tsk->thread.regs->msr & MSR_FP) { | |
163 | /* | |
164 | * This should only ever be called for current or | |
165 | * for a stopped child process. Since we save away | |
166 | * the FP register state on context switch, | |
167 | * there is something wrong if a stopped child appears | |
168 | * to still have its FP state in the CPU registers. | |
169 | */ | |
170 | BUG_ON(tsk != current); | |
171 | giveup_fpu(tsk); | |
172 | } | |
173 | preempt_enable(); | |
174 | } | |
175 | } | |
176 | EXPORT_SYMBOL_GPL(flush_fp_to_thread); | |
177 | ||
178 | void enable_kernel_fp(void) | |
179 | { | |
180 | WARN_ON(preemptible()); | |
181 | ||
182 | msr_check_and_set(MSR_FP); | |
183 | ||
184 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) { | |
185 | check_if_tm_restore_required(current); | |
186 | __giveup_fpu(current); | |
187 | } | |
188 | } | |
189 | EXPORT_SYMBOL(enable_kernel_fp); | |
190 | #endif /* CONFIG_PPC_FPU */ | |
191 | ||
192 | #ifdef CONFIG_ALTIVEC | |
193 | void giveup_altivec(struct task_struct *tsk) | |
194 | { | |
195 | check_if_tm_restore_required(tsk); | |
196 | ||
197 | msr_check_and_set(MSR_VEC); | |
198 | __giveup_altivec(tsk); | |
199 | msr_check_and_clear(MSR_VEC); | |
200 | } | |
201 | EXPORT_SYMBOL(giveup_altivec); | |
202 | ||
203 | void enable_kernel_altivec(void) | |
204 | { | |
205 | WARN_ON(preemptible()); | |
206 | ||
207 | msr_check_and_set(MSR_VEC); | |
208 | ||
209 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) { | |
210 | check_if_tm_restore_required(current); | |
211 | __giveup_altivec(current); | |
212 | } | |
213 | } | |
214 | EXPORT_SYMBOL(enable_kernel_altivec); | |
215 | ||
216 | /* | |
217 | * Make sure the VMX/Altivec register state in the | |
218 | * the thread_struct is up to date for task tsk. | |
219 | */ | |
220 | void flush_altivec_to_thread(struct task_struct *tsk) | |
221 | { | |
222 | if (tsk->thread.regs) { | |
223 | preempt_disable(); | |
224 | if (tsk->thread.regs->msr & MSR_VEC) { | |
225 | BUG_ON(tsk != current); | |
226 | giveup_altivec(tsk); | |
227 | } | |
228 | preempt_enable(); | |
229 | } | |
230 | } | |
231 | EXPORT_SYMBOL_GPL(flush_altivec_to_thread); | |
232 | #endif /* CONFIG_ALTIVEC */ | |
233 | ||
234 | #ifdef CONFIG_VSX | |
235 | void giveup_vsx(struct task_struct *tsk) | |
236 | { | |
237 | check_if_tm_restore_required(tsk); | |
238 | ||
239 | msr_check_and_set(MSR_FP|MSR_VEC|MSR_VSX); | |
240 | if (tsk->thread.regs->msr & MSR_FP) | |
241 | __giveup_fpu(tsk); | |
242 | if (tsk->thread.regs->msr & MSR_VEC) | |
243 | __giveup_altivec(tsk); | |
244 | __giveup_vsx(tsk); | |
245 | msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX); | |
246 | } | |
247 | EXPORT_SYMBOL(giveup_vsx); | |
248 | ||
249 | void enable_kernel_vsx(void) | |
250 | { | |
251 | WARN_ON(preemptible()); | |
252 | ||
253 | msr_check_and_set(MSR_FP|MSR_VEC|MSR_VSX); | |
254 | ||
255 | if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) { | |
256 | check_if_tm_restore_required(current); | |
257 | if (current->thread.regs->msr & MSR_FP) | |
258 | __giveup_fpu(current); | |
259 | if (current->thread.regs->msr & MSR_VEC) | |
260 | __giveup_altivec(current); | |
261 | __giveup_vsx(current); | |
262 | } | |
263 | } | |
264 | EXPORT_SYMBOL(enable_kernel_vsx); | |
265 | ||
266 | void flush_vsx_to_thread(struct task_struct *tsk) | |
267 | { | |
268 | if (tsk->thread.regs) { | |
269 | preempt_disable(); | |
270 | if (tsk->thread.regs->msr & MSR_VSX) { | |
271 | BUG_ON(tsk != current); | |
272 | giveup_vsx(tsk); | |
273 | } | |
274 | preempt_enable(); | |
275 | } | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(flush_vsx_to_thread); | |
278 | #endif /* CONFIG_VSX */ | |
279 | ||
280 | #ifdef CONFIG_SPE | |
281 | void giveup_spe(struct task_struct *tsk) | |
282 | { | |
283 | check_if_tm_restore_required(tsk); | |
284 | ||
285 | msr_check_and_set(MSR_SPE); | |
286 | __giveup_spe(tsk); | |
287 | msr_check_and_clear(MSR_SPE); | |
288 | } | |
289 | EXPORT_SYMBOL(giveup_spe); | |
290 | ||
291 | void enable_kernel_spe(void) | |
292 | { | |
293 | WARN_ON(preemptible()); | |
294 | ||
295 | msr_check_and_set(MSR_SPE); | |
296 | ||
297 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) { | |
298 | check_if_tm_restore_required(current); | |
299 | __giveup_spe(current); | |
300 | } | |
301 | } | |
302 | EXPORT_SYMBOL(enable_kernel_spe); | |
303 | ||
304 | void flush_spe_to_thread(struct task_struct *tsk) | |
305 | { | |
306 | if (tsk->thread.regs) { | |
307 | preempt_disable(); | |
308 | if (tsk->thread.regs->msr & MSR_SPE) { | |
309 | BUG_ON(tsk != current); | |
310 | tsk->thread.spefscr = mfspr(SPRN_SPEFSCR); | |
311 | giveup_spe(tsk); | |
312 | } | |
313 | preempt_enable(); | |
314 | } | |
315 | } | |
316 | #endif /* CONFIG_SPE */ | |
317 | ||
318 | static unsigned long msr_all_available; | |
319 | ||
320 | static int __init init_msr_all_available(void) | |
321 | { | |
322 | #ifdef CONFIG_PPC_FPU | |
323 | msr_all_available |= MSR_FP; | |
324 | #endif | |
325 | #ifdef CONFIG_ALTIVEC | |
326 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
327 | msr_all_available |= MSR_VEC; | |
328 | #endif | |
329 | #ifdef CONFIG_VSX | |
330 | if (cpu_has_feature(CPU_FTR_VSX)) | |
331 | msr_all_available |= MSR_VSX; | |
332 | #endif | |
333 | #ifdef CONFIG_SPE | |
334 | if (cpu_has_feature(CPU_FTR_SPE)) | |
335 | msr_all_available |= MSR_SPE; | |
336 | #endif | |
337 | ||
338 | return 0; | |
339 | } | |
340 | early_initcall(init_msr_all_available); | |
341 | ||
342 | void giveup_all(struct task_struct *tsk) | |
343 | { | |
344 | unsigned long usermsr; | |
345 | ||
346 | if (!tsk->thread.regs) | |
347 | return; | |
348 | ||
349 | usermsr = tsk->thread.regs->msr; | |
350 | ||
351 | if ((usermsr & msr_all_available) == 0) | |
352 | return; | |
353 | ||
354 | msr_check_and_set(msr_all_available); | |
355 | ||
356 | #ifdef CONFIG_PPC_FPU | |
357 | if (usermsr & MSR_FP) | |
358 | __giveup_fpu(tsk); | |
359 | #endif | |
360 | #ifdef CONFIG_ALTIVEC | |
361 | if (usermsr & MSR_VEC) | |
362 | __giveup_altivec(tsk); | |
363 | #endif | |
364 | #ifdef CONFIG_VSX | |
365 | if (usermsr & MSR_VSX) | |
366 | __giveup_vsx(tsk); | |
367 | #endif | |
368 | #ifdef CONFIG_SPE | |
369 | if (usermsr & MSR_SPE) | |
370 | __giveup_spe(tsk); | |
371 | #endif | |
372 | ||
373 | msr_check_and_clear(msr_all_available); | |
374 | } | |
375 | EXPORT_SYMBOL(giveup_all); | |
376 | ||
377 | void flush_all_to_thread(struct task_struct *tsk) | |
378 | { | |
379 | if (tsk->thread.regs) { | |
380 | preempt_disable(); | |
381 | BUG_ON(tsk != current); | |
382 | giveup_all(tsk); | |
383 | ||
384 | #ifdef CONFIG_SPE | |
385 | if (tsk->thread.regs->msr & MSR_SPE) | |
386 | tsk->thread.spefscr = mfspr(SPRN_SPEFSCR); | |
387 | #endif | |
388 | ||
389 | preempt_enable(); | |
390 | } | |
391 | } | |
392 | EXPORT_SYMBOL(flush_all_to_thread); | |
393 | ||
394 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS | |
395 | void do_send_trap(struct pt_regs *regs, unsigned long address, | |
396 | unsigned long error_code, int signal_code, int breakpt) | |
397 | { | |
398 | siginfo_t info; | |
399 | ||
400 | current->thread.trap_nr = signal_code; | |
401 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
402 | 11, SIGSEGV) == NOTIFY_STOP) | |
403 | return; | |
404 | ||
405 | /* Deliver the signal to userspace */ | |
406 | info.si_signo = SIGTRAP; | |
407 | info.si_errno = breakpt; /* breakpoint or watchpoint id */ | |
408 | info.si_code = signal_code; | |
409 | info.si_addr = (void __user *)address; | |
410 | force_sig_info(SIGTRAP, &info, current); | |
411 | } | |
412 | #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ | |
413 | void do_break (struct pt_regs *regs, unsigned long address, | |
414 | unsigned long error_code) | |
415 | { | |
416 | siginfo_t info; | |
417 | ||
418 | current->thread.trap_nr = TRAP_HWBKPT; | |
419 | if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, | |
420 | 11, SIGSEGV) == NOTIFY_STOP) | |
421 | return; | |
422 | ||
423 | if (debugger_break_match(regs)) | |
424 | return; | |
425 | ||
426 | /* Clear the breakpoint */ | |
427 | hw_breakpoint_disable(); | |
428 | ||
429 | /* Deliver the signal to userspace */ | |
430 | info.si_signo = SIGTRAP; | |
431 | info.si_errno = 0; | |
432 | info.si_code = TRAP_HWBKPT; | |
433 | info.si_addr = (void __user *)address; | |
434 | force_sig_info(SIGTRAP, &info, current); | |
435 | } | |
436 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ | |
437 | ||
438 | static DEFINE_PER_CPU(struct arch_hw_breakpoint, current_brk); | |
439 | ||
440 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS | |
441 | /* | |
442 | * Set the debug registers back to their default "safe" values. | |
443 | */ | |
444 | static void set_debug_reg_defaults(struct thread_struct *thread) | |
445 | { | |
446 | thread->debug.iac1 = thread->debug.iac2 = 0; | |
447 | #if CONFIG_PPC_ADV_DEBUG_IACS > 2 | |
448 | thread->debug.iac3 = thread->debug.iac4 = 0; | |
449 | #endif | |
450 | thread->debug.dac1 = thread->debug.dac2 = 0; | |
451 | #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 | |
452 | thread->debug.dvc1 = thread->debug.dvc2 = 0; | |
453 | #endif | |
454 | thread->debug.dbcr0 = 0; | |
455 | #ifdef CONFIG_BOOKE | |
456 | /* | |
457 | * Force User/Supervisor bits to b11 (user-only MSR[PR]=1) | |
458 | */ | |
459 | thread->debug.dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | | |
460 | DBCR1_IAC3US | DBCR1_IAC4US; | |
461 | /* | |
462 | * Force Data Address Compare User/Supervisor bits to be User-only | |
463 | * (0b11 MSR[PR]=1) and set all other bits in DBCR2 register to be 0. | |
464 | */ | |
465 | thread->debug.dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US; | |
466 | #else | |
467 | thread->debug.dbcr1 = 0; | |
468 | #endif | |
469 | } | |
470 | ||
471 | static void prime_debug_regs(struct debug_reg *debug) | |
472 | { | |
473 | /* | |
474 | * We could have inherited MSR_DE from userspace, since | |
475 | * it doesn't get cleared on exception entry. Make sure | |
476 | * MSR_DE is clear before we enable any debug events. | |
477 | */ | |
478 | mtmsr(mfmsr() & ~MSR_DE); | |
479 | ||
480 | mtspr(SPRN_IAC1, debug->iac1); | |
481 | mtspr(SPRN_IAC2, debug->iac2); | |
482 | #if CONFIG_PPC_ADV_DEBUG_IACS > 2 | |
483 | mtspr(SPRN_IAC3, debug->iac3); | |
484 | mtspr(SPRN_IAC4, debug->iac4); | |
485 | #endif | |
486 | mtspr(SPRN_DAC1, debug->dac1); | |
487 | mtspr(SPRN_DAC2, debug->dac2); | |
488 | #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 | |
489 | mtspr(SPRN_DVC1, debug->dvc1); | |
490 | mtspr(SPRN_DVC2, debug->dvc2); | |
491 | #endif | |
492 | mtspr(SPRN_DBCR0, debug->dbcr0); | |
493 | mtspr(SPRN_DBCR1, debug->dbcr1); | |
494 | #ifdef CONFIG_BOOKE | |
495 | mtspr(SPRN_DBCR2, debug->dbcr2); | |
496 | #endif | |
497 | } | |
498 | /* | |
499 | * Unless neither the old or new thread are making use of the | |
500 | * debug registers, set the debug registers from the values | |
501 | * stored in the new thread. | |
502 | */ | |
503 | void switch_booke_debug_regs(struct debug_reg *new_debug) | |
504 | { | |
505 | if ((current->thread.debug.dbcr0 & DBCR0_IDM) | |
506 | || (new_debug->dbcr0 & DBCR0_IDM)) | |
507 | prime_debug_regs(new_debug); | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(switch_booke_debug_regs); | |
510 | #else /* !CONFIG_PPC_ADV_DEBUG_REGS */ | |
511 | #ifndef CONFIG_HAVE_HW_BREAKPOINT | |
512 | static void set_debug_reg_defaults(struct thread_struct *thread) | |
513 | { | |
514 | thread->hw_brk.address = 0; | |
515 | thread->hw_brk.type = 0; | |
516 | set_breakpoint(&thread->hw_brk); | |
517 | } | |
518 | #endif /* !CONFIG_HAVE_HW_BREAKPOINT */ | |
519 | #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ | |
520 | ||
521 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS | |
522 | static inline int __set_dabr(unsigned long dabr, unsigned long dabrx) | |
523 | { | |
524 | mtspr(SPRN_DAC1, dabr); | |
525 | #ifdef CONFIG_PPC_47x | |
526 | isync(); | |
527 | #endif | |
528 | return 0; | |
529 | } | |
530 | #elif defined(CONFIG_PPC_BOOK3S) | |
531 | static inline int __set_dabr(unsigned long dabr, unsigned long dabrx) | |
532 | { | |
533 | mtspr(SPRN_DABR, dabr); | |
534 | if (cpu_has_feature(CPU_FTR_DABRX)) | |
535 | mtspr(SPRN_DABRX, dabrx); | |
536 | return 0; | |
537 | } | |
538 | #else | |
539 | static inline int __set_dabr(unsigned long dabr, unsigned long dabrx) | |
540 | { | |
541 | return -EINVAL; | |
542 | } | |
543 | #endif | |
544 | ||
545 | static inline int set_dabr(struct arch_hw_breakpoint *brk) | |
546 | { | |
547 | unsigned long dabr, dabrx; | |
548 | ||
549 | dabr = brk->address | (brk->type & HW_BRK_TYPE_DABR); | |
550 | dabrx = ((brk->type >> 3) & 0x7); | |
551 | ||
552 | if (ppc_md.set_dabr) | |
553 | return ppc_md.set_dabr(dabr, dabrx); | |
554 | ||
555 | return __set_dabr(dabr, dabrx); | |
556 | } | |
557 | ||
558 | static inline int set_dawr(struct arch_hw_breakpoint *brk) | |
559 | { | |
560 | unsigned long dawr, dawrx, mrd; | |
561 | ||
562 | dawr = brk->address; | |
563 | ||
564 | dawrx = (brk->type & (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)) \ | |
565 | << (63 - 58); //* read/write bits */ | |
566 | dawrx |= ((brk->type & (HW_BRK_TYPE_TRANSLATE)) >> 2) \ | |
567 | << (63 - 59); //* translate */ | |
568 | dawrx |= (brk->type & (HW_BRK_TYPE_PRIV_ALL)) \ | |
569 | >> 3; //* PRIM bits */ | |
570 | /* dawr length is stored in field MDR bits 48:53. Matches range in | |
571 | doublewords (64 bits) baised by -1 eg. 0b000000=1DW and | |
572 | 0b111111=64DW. | |
573 | brk->len is in bytes. | |
574 | This aligns up to double word size, shifts and does the bias. | |
575 | */ | |
576 | mrd = ((brk->len + 7) >> 3) - 1; | |
577 | dawrx |= (mrd & 0x3f) << (63 - 53); | |
578 | ||
579 | if (ppc_md.set_dawr) | |
580 | return ppc_md.set_dawr(dawr, dawrx); | |
581 | mtspr(SPRN_DAWR, dawr); | |
582 | mtspr(SPRN_DAWRX, dawrx); | |
583 | return 0; | |
584 | } | |
585 | ||
586 | void __set_breakpoint(struct arch_hw_breakpoint *brk) | |
587 | { | |
588 | memcpy(this_cpu_ptr(¤t_brk), brk, sizeof(*brk)); | |
589 | ||
590 | if (cpu_has_feature(CPU_FTR_DAWR)) | |
591 | set_dawr(brk); | |
592 | else | |
593 | set_dabr(brk); | |
594 | } | |
595 | ||
596 | void set_breakpoint(struct arch_hw_breakpoint *brk) | |
597 | { | |
598 | preempt_disable(); | |
599 | __set_breakpoint(brk); | |
600 | preempt_enable(); | |
601 | } | |
602 | ||
603 | #ifdef CONFIG_PPC64 | |
604 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
605 | #endif | |
606 | ||
607 | static inline bool hw_brk_match(struct arch_hw_breakpoint *a, | |
608 | struct arch_hw_breakpoint *b) | |
609 | { | |
610 | if (a->address != b->address) | |
611 | return false; | |
612 | if (a->type != b->type) | |
613 | return false; | |
614 | if (a->len != b->len) | |
615 | return false; | |
616 | return true; | |
617 | } | |
618 | ||
619 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
620 | static void tm_reclaim_thread(struct thread_struct *thr, | |
621 | struct thread_info *ti, uint8_t cause) | |
622 | { | |
623 | unsigned long msr_diff = 0; | |
624 | ||
625 | /* | |
626 | * If FP/VSX registers have been already saved to the | |
627 | * thread_struct, move them to the transact_fp array. | |
628 | * We clear the TIF_RESTORE_TM bit since after the reclaim | |
629 | * the thread will no longer be transactional. | |
630 | */ | |
631 | if (test_ti_thread_flag(ti, TIF_RESTORE_TM)) { | |
632 | msr_diff = thr->ckpt_regs.msr & ~thr->regs->msr; | |
633 | if (msr_diff & MSR_FP) | |
634 | memcpy(&thr->transact_fp, &thr->fp_state, | |
635 | sizeof(struct thread_fp_state)); | |
636 | if (msr_diff & MSR_VEC) | |
637 | memcpy(&thr->transact_vr, &thr->vr_state, | |
638 | sizeof(struct thread_vr_state)); | |
639 | clear_ti_thread_flag(ti, TIF_RESTORE_TM); | |
640 | msr_diff &= MSR_FP | MSR_VEC | MSR_VSX | MSR_FE0 | MSR_FE1; | |
641 | } | |
642 | ||
643 | /* | |
644 | * Use the current MSR TM suspended bit to track if we have | |
645 | * checkpointed state outstanding. | |
646 | * On signal delivery, we'd normally reclaim the checkpointed | |
647 | * state to obtain stack pointer (see:get_tm_stackpointer()). | |
648 | * This will then directly return to userspace without going | |
649 | * through __switch_to(). However, if the stack frame is bad, | |
650 | * we need to exit this thread which calls __switch_to() which | |
651 | * will again attempt to reclaim the already saved tm state. | |
652 | * Hence we need to check that we've not already reclaimed | |
653 | * this state. | |
654 | * We do this using the current MSR, rather tracking it in | |
655 | * some specific thread_struct bit, as it has the additional | |
656 | * benifit of checking for a potential TM bad thing exception. | |
657 | */ | |
658 | if (!MSR_TM_SUSPENDED(mfmsr())) | |
659 | return; | |
660 | ||
661 | tm_reclaim(thr, thr->regs->msr, cause); | |
662 | ||
663 | /* Having done the reclaim, we now have the checkpointed | |
664 | * FP/VSX values in the registers. These might be valid | |
665 | * even if we have previously called enable_kernel_fp() or | |
666 | * flush_fp_to_thread(), so update thr->regs->msr to | |
667 | * indicate their current validity. | |
668 | */ | |
669 | thr->regs->msr |= msr_diff; | |
670 | } | |
671 | ||
672 | void tm_reclaim_current(uint8_t cause) | |
673 | { | |
674 | tm_enable(); | |
675 | tm_reclaim_thread(¤t->thread, current_thread_info(), cause); | |
676 | } | |
677 | ||
678 | static inline void tm_reclaim_task(struct task_struct *tsk) | |
679 | { | |
680 | /* We have to work out if we're switching from/to a task that's in the | |
681 | * middle of a transaction. | |
682 | * | |
683 | * In switching we need to maintain a 2nd register state as | |
684 | * oldtask->thread.ckpt_regs. We tm_reclaim(oldproc); this saves the | |
685 | * checkpointed (tbegin) state in ckpt_regs and saves the transactional | |
686 | * (current) FPRs into oldtask->thread.transact_fpr[]. | |
687 | * | |
688 | * We also context switch (save) TFHAR/TEXASR/TFIAR in here. | |
689 | */ | |
690 | struct thread_struct *thr = &tsk->thread; | |
691 | ||
692 | if (!thr->regs) | |
693 | return; | |
694 | ||
695 | if (!MSR_TM_ACTIVE(thr->regs->msr)) | |
696 | goto out_and_saveregs; | |
697 | ||
698 | /* Stash the original thread MSR, as giveup_fpu et al will | |
699 | * modify it. We hold onto it to see whether the task used | |
700 | * FP & vector regs. If the TIF_RESTORE_TM flag is set, | |
701 | * ckpt_regs.msr is already set. | |
702 | */ | |
703 | if (!test_ti_thread_flag(task_thread_info(tsk), TIF_RESTORE_TM)) | |
704 | thr->ckpt_regs.msr = thr->regs->msr; | |
705 | ||
706 | TM_DEBUG("--- tm_reclaim on pid %d (NIP=%lx, " | |
707 | "ccr=%lx, msr=%lx, trap=%lx)\n", | |
708 | tsk->pid, thr->regs->nip, | |
709 | thr->regs->ccr, thr->regs->msr, | |
710 | thr->regs->trap); | |
711 | ||
712 | tm_reclaim_thread(thr, task_thread_info(tsk), TM_CAUSE_RESCHED); | |
713 | ||
714 | TM_DEBUG("--- tm_reclaim on pid %d complete\n", | |
715 | tsk->pid); | |
716 | ||
717 | out_and_saveregs: | |
718 | /* Always save the regs here, even if a transaction's not active. | |
719 | * This context-switches a thread's TM info SPRs. We do it here to | |
720 | * be consistent with the restore path (in recheckpoint) which | |
721 | * cannot happen later in _switch(). | |
722 | */ | |
723 | tm_save_sprs(thr); | |
724 | } | |
725 | ||
726 | extern void __tm_recheckpoint(struct thread_struct *thread, | |
727 | unsigned long orig_msr); | |
728 | ||
729 | void tm_recheckpoint(struct thread_struct *thread, | |
730 | unsigned long orig_msr) | |
731 | { | |
732 | unsigned long flags; | |
733 | ||
734 | /* We really can't be interrupted here as the TEXASR registers can't | |
735 | * change and later in the trecheckpoint code, we have a userspace R1. | |
736 | * So let's hard disable over this region. | |
737 | */ | |
738 | local_irq_save(flags); | |
739 | hard_irq_disable(); | |
740 | ||
741 | /* The TM SPRs are restored here, so that TEXASR.FS can be set | |
742 | * before the trecheckpoint and no explosion occurs. | |
743 | */ | |
744 | tm_restore_sprs(thread); | |
745 | ||
746 | __tm_recheckpoint(thread, orig_msr); | |
747 | ||
748 | local_irq_restore(flags); | |
749 | } | |
750 | ||
751 | static inline void tm_recheckpoint_new_task(struct task_struct *new) | |
752 | { | |
753 | unsigned long msr; | |
754 | ||
755 | if (!cpu_has_feature(CPU_FTR_TM)) | |
756 | return; | |
757 | ||
758 | /* Recheckpoint the registers of the thread we're about to switch to. | |
759 | * | |
760 | * If the task was using FP, we non-lazily reload both the original and | |
761 | * the speculative FP register states. This is because the kernel | |
762 | * doesn't see if/when a TM rollback occurs, so if we take an FP | |
763 | * unavoidable later, we are unable to determine which set of FP regs | |
764 | * need to be restored. | |
765 | */ | |
766 | if (!new->thread.regs) | |
767 | return; | |
768 | ||
769 | if (!MSR_TM_ACTIVE(new->thread.regs->msr)){ | |
770 | tm_restore_sprs(&new->thread); | |
771 | return; | |
772 | } | |
773 | msr = new->thread.ckpt_regs.msr; | |
774 | /* Recheckpoint to restore original checkpointed register state. */ | |
775 | TM_DEBUG("*** tm_recheckpoint of pid %d " | |
776 | "(new->msr 0x%lx, new->origmsr 0x%lx)\n", | |
777 | new->pid, new->thread.regs->msr, msr); | |
778 | ||
779 | /* This loads the checkpointed FP/VEC state, if used */ | |
780 | tm_recheckpoint(&new->thread, msr); | |
781 | ||
782 | /* This loads the speculative FP/VEC state, if used */ | |
783 | if (msr & MSR_FP) { | |
784 | do_load_up_transact_fpu(&new->thread); | |
785 | new->thread.regs->msr |= | |
786 | (MSR_FP | new->thread.fpexc_mode); | |
787 | } | |
788 | #ifdef CONFIG_ALTIVEC | |
789 | if (msr & MSR_VEC) { | |
790 | do_load_up_transact_altivec(&new->thread); | |
791 | new->thread.regs->msr |= MSR_VEC; | |
792 | } | |
793 | #endif | |
794 | /* We may as well turn on VSX too since all the state is restored now */ | |
795 | if (msr & MSR_VSX) | |
796 | new->thread.regs->msr |= MSR_VSX; | |
797 | ||
798 | TM_DEBUG("*** tm_recheckpoint of pid %d complete " | |
799 | "(kernel msr 0x%lx)\n", | |
800 | new->pid, mfmsr()); | |
801 | } | |
802 | ||
803 | static inline void __switch_to_tm(struct task_struct *prev) | |
804 | { | |
805 | if (cpu_has_feature(CPU_FTR_TM)) { | |
806 | tm_enable(); | |
807 | tm_reclaim_task(prev); | |
808 | } | |
809 | } | |
810 | ||
811 | /* | |
812 | * This is called if we are on the way out to userspace and the | |
813 | * TIF_RESTORE_TM flag is set. It checks if we need to reload | |
814 | * FP and/or vector state and does so if necessary. | |
815 | * If userspace is inside a transaction (whether active or | |
816 | * suspended) and FP/VMX/VSX instructions have ever been enabled | |
817 | * inside that transaction, then we have to keep them enabled | |
818 | * and keep the FP/VMX/VSX state loaded while ever the transaction | |
819 | * continues. The reason is that if we didn't, and subsequently | |
820 | * got a FP/VMX/VSX unavailable interrupt inside a transaction, | |
821 | * we don't know whether it's the same transaction, and thus we | |
822 | * don't know which of the checkpointed state and the transactional | |
823 | * state to use. | |
824 | */ | |
825 | void restore_tm_state(struct pt_regs *regs) | |
826 | { | |
827 | unsigned long msr_diff; | |
828 | ||
829 | clear_thread_flag(TIF_RESTORE_TM); | |
830 | if (!MSR_TM_ACTIVE(regs->msr)) | |
831 | return; | |
832 | ||
833 | msr_diff = current->thread.ckpt_regs.msr & ~regs->msr; | |
834 | msr_diff &= MSR_FP | MSR_VEC | MSR_VSX; | |
835 | if (msr_diff & MSR_FP) { | |
836 | msr_check_and_set(MSR_FP); | |
837 | load_fp_state(¤t->thread.fp_state); | |
838 | msr_check_and_clear(MSR_FP); | |
839 | regs->msr |= current->thread.fpexc_mode; | |
840 | } | |
841 | if (msr_diff & MSR_VEC) { | |
842 | msr_check_and_set(MSR_VEC); | |
843 | load_vr_state(¤t->thread.vr_state); | |
844 | msr_check_and_clear(MSR_VEC); | |
845 | } | |
846 | regs->msr |= msr_diff; | |
847 | } | |
848 | ||
849 | #else | |
850 | #define tm_recheckpoint_new_task(new) | |
851 | #define __switch_to_tm(prev) | |
852 | #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ | |
853 | ||
854 | static inline void save_sprs(struct thread_struct *t) | |
855 | { | |
856 | #ifdef CONFIG_ALTIVEC | |
857 | if (cpu_has_feature(cpu_has_feature(CPU_FTR_ALTIVEC))) | |
858 | t->vrsave = mfspr(SPRN_VRSAVE); | |
859 | #endif | |
860 | #ifdef CONFIG_PPC_BOOK3S_64 | |
861 | if (cpu_has_feature(CPU_FTR_DSCR)) | |
862 | t->dscr = mfspr(SPRN_DSCR); | |
863 | ||
864 | if (cpu_has_feature(CPU_FTR_ARCH_207S)) { | |
865 | t->bescr = mfspr(SPRN_BESCR); | |
866 | t->ebbhr = mfspr(SPRN_EBBHR); | |
867 | t->ebbrr = mfspr(SPRN_EBBRR); | |
868 | ||
869 | t->fscr = mfspr(SPRN_FSCR); | |
870 | ||
871 | /* | |
872 | * Note that the TAR is not available for use in the kernel. | |
873 | * (To provide this, the TAR should be backed up/restored on | |
874 | * exception entry/exit instead, and be in pt_regs. FIXME, | |
875 | * this should be in pt_regs anyway (for debug).) | |
876 | */ | |
877 | t->tar = mfspr(SPRN_TAR); | |
878 | } | |
879 | #endif | |
880 | } | |
881 | ||
882 | static inline void restore_sprs(struct thread_struct *old_thread, | |
883 | struct thread_struct *new_thread) | |
884 | { | |
885 | #ifdef CONFIG_ALTIVEC | |
886 | if (cpu_has_feature(CPU_FTR_ALTIVEC) && | |
887 | old_thread->vrsave != new_thread->vrsave) | |
888 | mtspr(SPRN_VRSAVE, new_thread->vrsave); | |
889 | #endif | |
890 | #ifdef CONFIG_PPC_BOOK3S_64 | |
891 | if (cpu_has_feature(CPU_FTR_DSCR)) { | |
892 | u64 dscr = get_paca()->dscr_default; | |
893 | u64 fscr = old_thread->fscr & ~FSCR_DSCR; | |
894 | ||
895 | if (new_thread->dscr_inherit) { | |
896 | dscr = new_thread->dscr; | |
897 | fscr |= FSCR_DSCR; | |
898 | } | |
899 | ||
900 | if (old_thread->dscr != dscr) | |
901 | mtspr(SPRN_DSCR, dscr); | |
902 | ||
903 | if (old_thread->fscr != fscr) | |
904 | mtspr(SPRN_FSCR, fscr); | |
905 | } | |
906 | ||
907 | if (cpu_has_feature(CPU_FTR_ARCH_207S)) { | |
908 | if (old_thread->bescr != new_thread->bescr) | |
909 | mtspr(SPRN_BESCR, new_thread->bescr); | |
910 | if (old_thread->ebbhr != new_thread->ebbhr) | |
911 | mtspr(SPRN_EBBHR, new_thread->ebbhr); | |
912 | if (old_thread->ebbrr != new_thread->ebbrr) | |
913 | mtspr(SPRN_EBBRR, new_thread->ebbrr); | |
914 | ||
915 | if (old_thread->tar != new_thread->tar) | |
916 | mtspr(SPRN_TAR, new_thread->tar); | |
917 | } | |
918 | #endif | |
919 | } | |
920 | ||
921 | struct task_struct *__switch_to(struct task_struct *prev, | |
922 | struct task_struct *new) | |
923 | { | |
924 | struct thread_struct *new_thread, *old_thread; | |
925 | struct task_struct *last; | |
926 | #ifdef CONFIG_PPC_BOOK3S_64 | |
927 | struct ppc64_tlb_batch *batch; | |
928 | #endif | |
929 | ||
930 | new_thread = &new->thread; | |
931 | old_thread = ¤t->thread; | |
932 | ||
933 | WARN_ON(!irqs_disabled()); | |
934 | ||
935 | #ifdef CONFIG_PPC64 | |
936 | /* | |
937 | * Collect processor utilization data per process | |
938 | */ | |
939 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
940 | struct cpu_usage *cu = this_cpu_ptr(&cpu_usage_array); | |
941 | long unsigned start_tb, current_tb; | |
942 | start_tb = old_thread->start_tb; | |
943 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
944 | old_thread->accum_tb += (current_tb - start_tb); | |
945 | new_thread->start_tb = current_tb; | |
946 | } | |
947 | #endif /* CONFIG_PPC64 */ | |
948 | ||
949 | #ifdef CONFIG_PPC_BOOK3S_64 | |
950 | batch = this_cpu_ptr(&ppc64_tlb_batch); | |
951 | if (batch->active) { | |
952 | current_thread_info()->local_flags |= _TLF_LAZY_MMU; | |
953 | if (batch->index) | |
954 | __flush_tlb_pending(batch); | |
955 | batch->active = 0; | |
956 | } | |
957 | #endif /* CONFIG_PPC_BOOK3S_64 */ | |
958 | ||
959 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS | |
960 | switch_booke_debug_regs(&new->thread.debug); | |
961 | #else | |
962 | /* | |
963 | * For PPC_BOOK3S_64, we use the hw-breakpoint interfaces that would | |
964 | * schedule DABR | |
965 | */ | |
966 | #ifndef CONFIG_HAVE_HW_BREAKPOINT | |
967 | if (unlikely(!hw_brk_match(this_cpu_ptr(¤t_brk), &new->thread.hw_brk))) | |
968 | __set_breakpoint(&new->thread.hw_brk); | |
969 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ | |
970 | #endif | |
971 | ||
972 | /* | |
973 | * We need to save SPRs before treclaim/trecheckpoint as these will | |
974 | * change a number of them. | |
975 | */ | |
976 | save_sprs(&prev->thread); | |
977 | ||
978 | __switch_to_tm(prev); | |
979 | ||
980 | /* Save FPU, Altivec, VSX and SPE state */ | |
981 | giveup_all(prev); | |
982 | ||
983 | /* | |
984 | * We can't take a PMU exception inside _switch() since there is a | |
985 | * window where the kernel stack SLB and the kernel stack are out | |
986 | * of sync. Hard disable here. | |
987 | */ | |
988 | hard_irq_disable(); | |
989 | ||
990 | tm_recheckpoint_new_task(new); | |
991 | ||
992 | /* | |
993 | * Call restore_sprs() before calling _switch(). If we move it after | |
994 | * _switch() then we miss out on calling it for new tasks. The reason | |
995 | * for this is we manually create a stack frame for new tasks that | |
996 | * directly returns through ret_from_fork() or | |
997 | * ret_from_kernel_thread(). See copy_thread() for details. | |
998 | */ | |
999 | restore_sprs(old_thread, new_thread); | |
1000 | ||
1001 | last = _switch(old_thread, new_thread); | |
1002 | ||
1003 | #ifdef CONFIG_PPC_BOOK3S_64 | |
1004 | if (current_thread_info()->local_flags & _TLF_LAZY_MMU) { | |
1005 | current_thread_info()->local_flags &= ~_TLF_LAZY_MMU; | |
1006 | batch = this_cpu_ptr(&ppc64_tlb_batch); | |
1007 | batch->active = 1; | |
1008 | } | |
1009 | #endif /* CONFIG_PPC_BOOK3S_64 */ | |
1010 | ||
1011 | return last; | |
1012 | } | |
1013 | ||
1014 | static int instructions_to_print = 16; | |
1015 | ||
1016 | static void show_instructions(struct pt_regs *regs) | |
1017 | { | |
1018 | int i; | |
1019 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
1020 | sizeof(int)); | |
1021 | ||
1022 | printk("Instruction dump:"); | |
1023 | ||
1024 | for (i = 0; i < instructions_to_print; i++) { | |
1025 | int instr; | |
1026 | ||
1027 | if (!(i % 8)) | |
1028 | printk("\n"); | |
1029 | ||
1030 | #if !defined(CONFIG_BOOKE) | |
1031 | /* If executing with the IMMU off, adjust pc rather | |
1032 | * than print XXXXXXXX. | |
1033 | */ | |
1034 | if (!(regs->msr & MSR_IR)) | |
1035 | pc = (unsigned long)phys_to_virt(pc); | |
1036 | #endif | |
1037 | ||
1038 | if (!__kernel_text_address(pc) || | |
1039 | probe_kernel_address((unsigned int __user *)pc, instr)) { | |
1040 | printk(KERN_CONT "XXXXXXXX "); | |
1041 | } else { | |
1042 | if (regs->nip == pc) | |
1043 | printk(KERN_CONT "<%08x> ", instr); | |
1044 | else | |
1045 | printk(KERN_CONT "%08x ", instr); | |
1046 | } | |
1047 | ||
1048 | pc += sizeof(int); | |
1049 | } | |
1050 | ||
1051 | printk("\n"); | |
1052 | } | |
1053 | ||
1054 | struct regbit { | |
1055 | unsigned long bit; | |
1056 | const char *name; | |
1057 | }; | |
1058 | ||
1059 | static struct regbit msr_bits[] = { | |
1060 | #if defined(CONFIG_PPC64) && !defined(CONFIG_BOOKE) | |
1061 | {MSR_SF, "SF"}, | |
1062 | {MSR_HV, "HV"}, | |
1063 | #endif | |
1064 | {MSR_VEC, "VEC"}, | |
1065 | {MSR_VSX, "VSX"}, | |
1066 | #ifdef CONFIG_BOOKE | |
1067 | {MSR_CE, "CE"}, | |
1068 | #endif | |
1069 | {MSR_EE, "EE"}, | |
1070 | {MSR_PR, "PR"}, | |
1071 | {MSR_FP, "FP"}, | |
1072 | {MSR_ME, "ME"}, | |
1073 | #ifdef CONFIG_BOOKE | |
1074 | {MSR_DE, "DE"}, | |
1075 | #else | |
1076 | {MSR_SE, "SE"}, | |
1077 | {MSR_BE, "BE"}, | |
1078 | #endif | |
1079 | {MSR_IR, "IR"}, | |
1080 | {MSR_DR, "DR"}, | |
1081 | {MSR_PMM, "PMM"}, | |
1082 | #ifndef CONFIG_BOOKE | |
1083 | {MSR_RI, "RI"}, | |
1084 | {MSR_LE, "LE"}, | |
1085 | #endif | |
1086 | {0, NULL} | |
1087 | }; | |
1088 | ||
1089 | static void print_bits(unsigned long val, struct regbit *bits, const char *sep) | |
1090 | { | |
1091 | const char *s = ""; | |
1092 | ||
1093 | for (; bits->bit; ++bits) | |
1094 | if (val & bits->bit) { | |
1095 | printk("%s%s", s, bits->name); | |
1096 | s = sep; | |
1097 | } | |
1098 | } | |
1099 | ||
1100 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
1101 | static struct regbit msr_tm_bits[] = { | |
1102 | {MSR_TS_T, "T"}, | |
1103 | {MSR_TS_S, "S"}, | |
1104 | {MSR_TM, "E"}, | |
1105 | {0, NULL} | |
1106 | }; | |
1107 | ||
1108 | static void print_tm_bits(unsigned long val) | |
1109 | { | |
1110 | /* | |
1111 | * This only prints something if at least one of the TM bit is set. | |
1112 | * Inside the TM[], the output means: | |
1113 | * E: Enabled (bit 32) | |
1114 | * S: Suspended (bit 33) | |
1115 | * T: Transactional (bit 34) | |
1116 | */ | |
1117 | if (val & (MSR_TM | MSR_TS_S | MSR_TS_T)) { | |
1118 | printk(",TM["); | |
1119 | print_bits(val, msr_tm_bits, ""); | |
1120 | printk("]"); | |
1121 | } | |
1122 | } | |
1123 | #else | |
1124 | static void print_tm_bits(unsigned long val) {} | |
1125 | #endif | |
1126 | ||
1127 | static void print_msr_bits(unsigned long val) | |
1128 | { | |
1129 | printk("<"); | |
1130 | print_bits(val, msr_bits, ","); | |
1131 | print_tm_bits(val); | |
1132 | printk(">"); | |
1133 | } | |
1134 | ||
1135 | #ifdef CONFIG_PPC64 | |
1136 | #define REG "%016lx" | |
1137 | #define REGS_PER_LINE 4 | |
1138 | #define LAST_VOLATILE 13 | |
1139 | #else | |
1140 | #define REG "%08lx" | |
1141 | #define REGS_PER_LINE 8 | |
1142 | #define LAST_VOLATILE 12 | |
1143 | #endif | |
1144 | ||
1145 | void show_regs(struct pt_regs * regs) | |
1146 | { | |
1147 | int i, trap; | |
1148 | ||
1149 | show_regs_print_info(KERN_DEFAULT); | |
1150 | ||
1151 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", | |
1152 | regs->nip, regs->link, regs->ctr); | |
1153 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
1154 | regs, regs->trap, print_tainted(), init_utsname()->release); | |
1155 | printk("MSR: "REG" ", regs->msr); | |
1156 | print_msr_bits(regs->msr); | |
1157 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); | |
1158 | trap = TRAP(regs); | |
1159 | if ((regs->trap != 0xc00) && cpu_has_feature(CPU_FTR_CFAR)) | |
1160 | printk("CFAR: "REG" ", regs->orig_gpr3); | |
1161 | if (trap == 0x200 || trap == 0x300 || trap == 0x600) | |
1162 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
1163 | printk("DEAR: "REG" ESR: "REG" ", regs->dar, regs->dsisr); | |
1164 | #else | |
1165 | printk("DAR: "REG" DSISR: %08lx ", regs->dar, regs->dsisr); | |
1166 | #endif | |
1167 | #ifdef CONFIG_PPC64 | |
1168 | printk("SOFTE: %ld ", regs->softe); | |
1169 | #endif | |
1170 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
1171 | if (MSR_TM_ACTIVE(regs->msr)) | |
1172 | printk("\nPACATMSCRATCH: %016llx ", get_paca()->tm_scratch); | |
1173 | #endif | |
1174 | ||
1175 | for (i = 0; i < 32; i++) { | |
1176 | if ((i % REGS_PER_LINE) == 0) | |
1177 | printk("\nGPR%02d: ", i); | |
1178 | printk(REG " ", regs->gpr[i]); | |
1179 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
1180 | break; | |
1181 | } | |
1182 | printk("\n"); | |
1183 | #ifdef CONFIG_KALLSYMS | |
1184 | /* | |
1185 | * Lookup NIP late so we have the best change of getting the | |
1186 | * above info out without failing | |
1187 | */ | |
1188 | printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip); | |
1189 | printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link); | |
1190 | #endif | |
1191 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
1192 | if (!user_mode(regs)) | |
1193 | show_instructions(regs); | |
1194 | } | |
1195 | ||
1196 | void exit_thread(void) | |
1197 | { | |
1198 | } | |
1199 | ||
1200 | void flush_thread(void) | |
1201 | { | |
1202 | #ifdef CONFIG_HAVE_HW_BREAKPOINT | |
1203 | flush_ptrace_hw_breakpoint(current); | |
1204 | #else /* CONFIG_HAVE_HW_BREAKPOINT */ | |
1205 | set_debug_reg_defaults(¤t->thread); | |
1206 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ | |
1207 | } | |
1208 | ||
1209 | void | |
1210 | release_thread(struct task_struct *t) | |
1211 | { | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * this gets called so that we can store coprocessor state into memory and | |
1216 | * copy the current task into the new thread. | |
1217 | */ | |
1218 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) | |
1219 | { | |
1220 | flush_all_to_thread(src); | |
1221 | /* | |
1222 | * Flush TM state out so we can copy it. __switch_to_tm() does this | |
1223 | * flush but it removes the checkpointed state from the current CPU and | |
1224 | * transitions the CPU out of TM mode. Hence we need to call | |
1225 | * tm_recheckpoint_new_task() (on the same task) to restore the | |
1226 | * checkpointed state back and the TM mode. | |
1227 | */ | |
1228 | __switch_to_tm(src); | |
1229 | tm_recheckpoint_new_task(src); | |
1230 | ||
1231 | *dst = *src; | |
1232 | ||
1233 | clear_task_ebb(dst); | |
1234 | ||
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | static void setup_ksp_vsid(struct task_struct *p, unsigned long sp) | |
1239 | { | |
1240 | #ifdef CONFIG_PPC_STD_MMU_64 | |
1241 | unsigned long sp_vsid; | |
1242 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; | |
1243 | ||
1244 | if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) | |
1245 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) | |
1246 | << SLB_VSID_SHIFT_1T; | |
1247 | else | |
1248 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) | |
1249 | << SLB_VSID_SHIFT; | |
1250 | sp_vsid |= SLB_VSID_KERNEL | llp; | |
1251 | p->thread.ksp_vsid = sp_vsid; | |
1252 | #endif | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Copy a thread.. | |
1257 | */ | |
1258 | ||
1259 | /* | |
1260 | * Copy architecture-specific thread state | |
1261 | */ | |
1262 | int copy_thread(unsigned long clone_flags, unsigned long usp, | |
1263 | unsigned long kthread_arg, struct task_struct *p) | |
1264 | { | |
1265 | struct pt_regs *childregs, *kregs; | |
1266 | extern void ret_from_fork(void); | |
1267 | extern void ret_from_kernel_thread(void); | |
1268 | void (*f)(void); | |
1269 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; | |
1270 | ||
1271 | /* Copy registers */ | |
1272 | sp -= sizeof(struct pt_regs); | |
1273 | childregs = (struct pt_regs *) sp; | |
1274 | if (unlikely(p->flags & PF_KTHREAD)) { | |
1275 | /* kernel thread */ | |
1276 | struct thread_info *ti = (void *)task_stack_page(p); | |
1277 | memset(childregs, 0, sizeof(struct pt_regs)); | |
1278 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
1279 | /* function */ | |
1280 | if (usp) | |
1281 | childregs->gpr[14] = ppc_function_entry((void *)usp); | |
1282 | #ifdef CONFIG_PPC64 | |
1283 | clear_tsk_thread_flag(p, TIF_32BIT); | |
1284 | childregs->softe = 1; | |
1285 | #endif | |
1286 | childregs->gpr[15] = kthread_arg; | |
1287 | p->thread.regs = NULL; /* no user register state */ | |
1288 | ti->flags |= _TIF_RESTOREALL; | |
1289 | f = ret_from_kernel_thread; | |
1290 | } else { | |
1291 | /* user thread */ | |
1292 | struct pt_regs *regs = current_pt_regs(); | |
1293 | CHECK_FULL_REGS(regs); | |
1294 | *childregs = *regs; | |
1295 | if (usp) | |
1296 | childregs->gpr[1] = usp; | |
1297 | p->thread.regs = childregs; | |
1298 | childregs->gpr[3] = 0; /* Result from fork() */ | |
1299 | if (clone_flags & CLONE_SETTLS) { | |
1300 | #ifdef CONFIG_PPC64 | |
1301 | if (!is_32bit_task()) | |
1302 | childregs->gpr[13] = childregs->gpr[6]; | |
1303 | else | |
1304 | #endif | |
1305 | childregs->gpr[2] = childregs->gpr[6]; | |
1306 | } | |
1307 | ||
1308 | f = ret_from_fork; | |
1309 | } | |
1310 | sp -= STACK_FRAME_OVERHEAD; | |
1311 | ||
1312 | /* | |
1313 | * The way this works is that at some point in the future | |
1314 | * some task will call _switch to switch to the new task. | |
1315 | * That will pop off the stack frame created below and start | |
1316 | * the new task running at ret_from_fork. The new task will | |
1317 | * do some house keeping and then return from the fork or clone | |
1318 | * system call, using the stack frame created above. | |
1319 | */ | |
1320 | ((unsigned long *)sp)[0] = 0; | |
1321 | sp -= sizeof(struct pt_regs); | |
1322 | kregs = (struct pt_regs *) sp; | |
1323 | sp -= STACK_FRAME_OVERHEAD; | |
1324 | p->thread.ksp = sp; | |
1325 | #ifdef CONFIG_PPC32 | |
1326 | p->thread.ksp_limit = (unsigned long)task_stack_page(p) + | |
1327 | _ALIGN_UP(sizeof(struct thread_info), 16); | |
1328 | #endif | |
1329 | #ifdef CONFIG_HAVE_HW_BREAKPOINT | |
1330 | p->thread.ptrace_bps[0] = NULL; | |
1331 | #endif | |
1332 | ||
1333 | p->thread.fp_save_area = NULL; | |
1334 | #ifdef CONFIG_ALTIVEC | |
1335 | p->thread.vr_save_area = NULL; | |
1336 | #endif | |
1337 | ||
1338 | setup_ksp_vsid(p, sp); | |
1339 | ||
1340 | #ifdef CONFIG_PPC64 | |
1341 | if (cpu_has_feature(CPU_FTR_DSCR)) { | |
1342 | p->thread.dscr_inherit = current->thread.dscr_inherit; | |
1343 | p->thread.dscr = mfspr(SPRN_DSCR); | |
1344 | } | |
1345 | if (cpu_has_feature(CPU_FTR_HAS_PPR)) | |
1346 | p->thread.ppr = INIT_PPR; | |
1347 | #endif | |
1348 | kregs->nip = ppc_function_entry(f); | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Set up a thread for executing a new program | |
1354 | */ | |
1355 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) | |
1356 | { | |
1357 | #ifdef CONFIG_PPC64 | |
1358 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
1359 | #endif | |
1360 | ||
1361 | /* | |
1362 | * If we exec out of a kernel thread then thread.regs will not be | |
1363 | * set. Do it now. | |
1364 | */ | |
1365 | if (!current->thread.regs) { | |
1366 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; | |
1367 | current->thread.regs = regs - 1; | |
1368 | } | |
1369 | ||
1370 | memset(regs->gpr, 0, sizeof(regs->gpr)); | |
1371 | regs->ctr = 0; | |
1372 | regs->link = 0; | |
1373 | regs->xer = 0; | |
1374 | regs->ccr = 0; | |
1375 | regs->gpr[1] = sp; | |
1376 | ||
1377 | /* | |
1378 | * We have just cleared all the nonvolatile GPRs, so make | |
1379 | * FULL_REGS(regs) return true. This is necessary to allow | |
1380 | * ptrace to examine the thread immediately after exec. | |
1381 | */ | |
1382 | regs->trap &= ~1UL; | |
1383 | ||
1384 | #ifdef CONFIG_PPC32 | |
1385 | regs->mq = 0; | |
1386 | regs->nip = start; | |
1387 | regs->msr = MSR_USER; | |
1388 | #else | |
1389 | if (!is_32bit_task()) { | |
1390 | unsigned long entry; | |
1391 | ||
1392 | if (is_elf2_task()) { | |
1393 | /* Look ma, no function descriptors! */ | |
1394 | entry = start; | |
1395 | ||
1396 | /* | |
1397 | * Ulrich says: | |
1398 | * The latest iteration of the ABI requires that when | |
1399 | * calling a function (at its global entry point), | |
1400 | * the caller must ensure r12 holds the entry point | |
1401 | * address (so that the function can quickly | |
1402 | * establish addressability). | |
1403 | */ | |
1404 | regs->gpr[12] = start; | |
1405 | /* Make sure that's restored on entry to userspace. */ | |
1406 | set_thread_flag(TIF_RESTOREALL); | |
1407 | } else { | |
1408 | unsigned long toc; | |
1409 | ||
1410 | /* start is a relocated pointer to the function | |
1411 | * descriptor for the elf _start routine. The first | |
1412 | * entry in the function descriptor is the entry | |
1413 | * address of _start and the second entry is the TOC | |
1414 | * value we need to use. | |
1415 | */ | |
1416 | __get_user(entry, (unsigned long __user *)start); | |
1417 | __get_user(toc, (unsigned long __user *)start+1); | |
1418 | ||
1419 | /* Check whether the e_entry function descriptor entries | |
1420 | * need to be relocated before we can use them. | |
1421 | */ | |
1422 | if (load_addr != 0) { | |
1423 | entry += load_addr; | |
1424 | toc += load_addr; | |
1425 | } | |
1426 | regs->gpr[2] = toc; | |
1427 | } | |
1428 | regs->nip = entry; | |
1429 | regs->msr = MSR_USER64; | |
1430 | } else { | |
1431 | regs->nip = start; | |
1432 | regs->gpr[2] = 0; | |
1433 | regs->msr = MSR_USER32; | |
1434 | } | |
1435 | #endif | |
1436 | #ifdef CONFIG_VSX | |
1437 | current->thread.used_vsr = 0; | |
1438 | #endif | |
1439 | memset(¤t->thread.fp_state, 0, sizeof(current->thread.fp_state)); | |
1440 | current->thread.fp_save_area = NULL; | |
1441 | #ifdef CONFIG_ALTIVEC | |
1442 | memset(¤t->thread.vr_state, 0, sizeof(current->thread.vr_state)); | |
1443 | current->thread.vr_state.vscr.u[3] = 0x00010000; /* Java mode disabled */ | |
1444 | current->thread.vr_save_area = NULL; | |
1445 | current->thread.vrsave = 0; | |
1446 | current->thread.used_vr = 0; | |
1447 | #endif /* CONFIG_ALTIVEC */ | |
1448 | #ifdef CONFIG_SPE | |
1449 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
1450 | current->thread.acc = 0; | |
1451 | current->thread.spefscr = 0; | |
1452 | current->thread.used_spe = 0; | |
1453 | #endif /* CONFIG_SPE */ | |
1454 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
1455 | if (cpu_has_feature(CPU_FTR_TM)) | |
1456 | regs->msr |= MSR_TM; | |
1457 | current->thread.tm_tfhar = 0; | |
1458 | current->thread.tm_texasr = 0; | |
1459 | current->thread.tm_tfiar = 0; | |
1460 | #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ | |
1461 | } | |
1462 | EXPORT_SYMBOL(start_thread); | |
1463 | ||
1464 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
1465 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
1466 | ||
1467 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
1468 | { | |
1469 | struct pt_regs *regs = tsk->thread.regs; | |
1470 | ||
1471 | /* This is a bit hairy. If we are an SPE enabled processor | |
1472 | * (have embedded fp) we store the IEEE exception enable flags in | |
1473 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
1474 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
1475 | if (val & PR_FP_EXC_SW_ENABLE) { | |
1476 | #ifdef CONFIG_SPE | |
1477 | if (cpu_has_feature(CPU_FTR_SPE)) { | |
1478 | /* | |
1479 | * When the sticky exception bits are set | |
1480 | * directly by userspace, it must call prctl | |
1481 | * with PR_GET_FPEXC (with PR_FP_EXC_SW_ENABLE | |
1482 | * in the existing prctl settings) or | |
1483 | * PR_SET_FPEXC (with PR_FP_EXC_SW_ENABLE in | |
1484 | * the bits being set). <fenv.h> functions | |
1485 | * saving and restoring the whole | |
1486 | * floating-point environment need to do so | |
1487 | * anyway to restore the prctl settings from | |
1488 | * the saved environment. | |
1489 | */ | |
1490 | tsk->thread.spefscr_last = mfspr(SPRN_SPEFSCR); | |
1491 | tsk->thread.fpexc_mode = val & | |
1492 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
1493 | return 0; | |
1494 | } else { | |
1495 | return -EINVAL; | |
1496 | } | |
1497 | #else | |
1498 | return -EINVAL; | |
1499 | #endif | |
1500 | } | |
1501 | ||
1502 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
1503 | * __pack_fe01 use do not overlap with bits used for | |
1504 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
1505 | * on CONFIG_SPE implementations are reserved so writing to | |
1506 | * them does not change anything */ | |
1507 | if (val > PR_FP_EXC_PRECISE) | |
1508 | return -EINVAL; | |
1509 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
1510 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
1511 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
1512 | | tsk->thread.fpexc_mode; | |
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
1517 | { | |
1518 | unsigned int val; | |
1519 | ||
1520 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
1521 | #ifdef CONFIG_SPE | |
1522 | if (cpu_has_feature(CPU_FTR_SPE)) { | |
1523 | /* | |
1524 | * When the sticky exception bits are set | |
1525 | * directly by userspace, it must call prctl | |
1526 | * with PR_GET_FPEXC (with PR_FP_EXC_SW_ENABLE | |
1527 | * in the existing prctl settings) or | |
1528 | * PR_SET_FPEXC (with PR_FP_EXC_SW_ENABLE in | |
1529 | * the bits being set). <fenv.h> functions | |
1530 | * saving and restoring the whole | |
1531 | * floating-point environment need to do so | |
1532 | * anyway to restore the prctl settings from | |
1533 | * the saved environment. | |
1534 | */ | |
1535 | tsk->thread.spefscr_last = mfspr(SPRN_SPEFSCR); | |
1536 | val = tsk->thread.fpexc_mode; | |
1537 | } else | |
1538 | return -EINVAL; | |
1539 | #else | |
1540 | return -EINVAL; | |
1541 | #endif | |
1542 | else | |
1543 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
1544 | return put_user(val, (unsigned int __user *) adr); | |
1545 | } | |
1546 | ||
1547 | int set_endian(struct task_struct *tsk, unsigned int val) | |
1548 | { | |
1549 | struct pt_regs *regs = tsk->thread.regs; | |
1550 | ||
1551 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || | |
1552 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) | |
1553 | return -EINVAL; | |
1554 | ||
1555 | if (regs == NULL) | |
1556 | return -EINVAL; | |
1557 | ||
1558 | if (val == PR_ENDIAN_BIG) | |
1559 | regs->msr &= ~MSR_LE; | |
1560 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) | |
1561 | regs->msr |= MSR_LE; | |
1562 | else | |
1563 | return -EINVAL; | |
1564 | ||
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | int get_endian(struct task_struct *tsk, unsigned long adr) | |
1569 | { | |
1570 | struct pt_regs *regs = tsk->thread.regs; | |
1571 | unsigned int val; | |
1572 | ||
1573 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && | |
1574 | !cpu_has_feature(CPU_FTR_REAL_LE)) | |
1575 | return -EINVAL; | |
1576 | ||
1577 | if (regs == NULL) | |
1578 | return -EINVAL; | |
1579 | ||
1580 | if (regs->msr & MSR_LE) { | |
1581 | if (cpu_has_feature(CPU_FTR_REAL_LE)) | |
1582 | val = PR_ENDIAN_LITTLE; | |
1583 | else | |
1584 | val = PR_ENDIAN_PPC_LITTLE; | |
1585 | } else | |
1586 | val = PR_ENDIAN_BIG; | |
1587 | ||
1588 | return put_user(val, (unsigned int __user *)adr); | |
1589 | } | |
1590 | ||
1591 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) | |
1592 | { | |
1593 | tsk->thread.align_ctl = val; | |
1594 | return 0; | |
1595 | } | |
1596 | ||
1597 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) | |
1598 | { | |
1599 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); | |
1600 | } | |
1601 | ||
1602 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, | |
1603 | unsigned long nbytes) | |
1604 | { | |
1605 | unsigned long stack_page; | |
1606 | unsigned long cpu = task_cpu(p); | |
1607 | ||
1608 | /* | |
1609 | * Avoid crashing if the stack has overflowed and corrupted | |
1610 | * task_cpu(p), which is in the thread_info struct. | |
1611 | */ | |
1612 | if (cpu < NR_CPUS && cpu_possible(cpu)) { | |
1613 | stack_page = (unsigned long) hardirq_ctx[cpu]; | |
1614 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1615 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1616 | return 1; | |
1617 | ||
1618 | stack_page = (unsigned long) softirq_ctx[cpu]; | |
1619 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1620 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1621 | return 1; | |
1622 | } | |
1623 | return 0; | |
1624 | } | |
1625 | ||
1626 | int validate_sp(unsigned long sp, struct task_struct *p, | |
1627 | unsigned long nbytes) | |
1628 | { | |
1629 | unsigned long stack_page = (unsigned long)task_stack_page(p); | |
1630 | ||
1631 | if (sp >= stack_page + sizeof(struct thread_struct) | |
1632 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
1633 | return 1; | |
1634 | ||
1635 | return valid_irq_stack(sp, p, nbytes); | |
1636 | } | |
1637 | ||
1638 | EXPORT_SYMBOL(validate_sp); | |
1639 | ||
1640 | unsigned long get_wchan(struct task_struct *p) | |
1641 | { | |
1642 | unsigned long ip, sp; | |
1643 | int count = 0; | |
1644 | ||
1645 | if (!p || p == current || p->state == TASK_RUNNING) | |
1646 | return 0; | |
1647 | ||
1648 | sp = p->thread.ksp; | |
1649 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) | |
1650 | return 0; | |
1651 | ||
1652 | do { | |
1653 | sp = *(unsigned long *)sp; | |
1654 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) | |
1655 | return 0; | |
1656 | if (count > 0) { | |
1657 | ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE]; | |
1658 | if (!in_sched_functions(ip)) | |
1659 | return ip; | |
1660 | } | |
1661 | } while (count++ < 16); | |
1662 | return 0; | |
1663 | } | |
1664 | ||
1665 | static int kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH; | |
1666 | ||
1667 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
1668 | { | |
1669 | unsigned long sp, ip, lr, newsp; | |
1670 | int count = 0; | |
1671 | int firstframe = 1; | |
1672 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
1673 | int curr_frame = current->curr_ret_stack; | |
1674 | extern void return_to_handler(void); | |
1675 | unsigned long rth = (unsigned long)return_to_handler; | |
1676 | #endif | |
1677 | ||
1678 | sp = (unsigned long) stack; | |
1679 | if (tsk == NULL) | |
1680 | tsk = current; | |
1681 | if (sp == 0) { | |
1682 | if (tsk == current) | |
1683 | sp = current_stack_pointer(); | |
1684 | else | |
1685 | sp = tsk->thread.ksp; | |
1686 | } | |
1687 | ||
1688 | lr = 0; | |
1689 | printk("Call Trace:\n"); | |
1690 | do { | |
1691 | if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) | |
1692 | return; | |
1693 | ||
1694 | stack = (unsigned long *) sp; | |
1695 | newsp = stack[0]; | |
1696 | ip = stack[STACK_FRAME_LR_SAVE]; | |
1697 | if (!firstframe || ip != lr) { | |
1698 | printk("["REG"] ["REG"] %pS", sp, ip, (void *)ip); | |
1699 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
1700 | if ((ip == rth) && curr_frame >= 0) { | |
1701 | printk(" (%pS)", | |
1702 | (void *)current->ret_stack[curr_frame].ret); | |
1703 | curr_frame--; | |
1704 | } | |
1705 | #endif | |
1706 | if (firstframe) | |
1707 | printk(" (unreliable)"); | |
1708 | printk("\n"); | |
1709 | } | |
1710 | firstframe = 0; | |
1711 | ||
1712 | /* | |
1713 | * See if this is an exception frame. | |
1714 | * We look for the "regshere" marker in the current frame. | |
1715 | */ | |
1716 | if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) | |
1717 | && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { | |
1718 | struct pt_regs *regs = (struct pt_regs *) | |
1719 | (sp + STACK_FRAME_OVERHEAD); | |
1720 | lr = regs->link; | |
1721 | printk("--- interrupt: %lx at %pS\n LR = %pS\n", | |
1722 | regs->trap, (void *)regs->nip, (void *)lr); | |
1723 | firstframe = 1; | |
1724 | } | |
1725 | ||
1726 | sp = newsp; | |
1727 | } while (count++ < kstack_depth_to_print); | |
1728 | } | |
1729 | ||
1730 | #ifdef CONFIG_PPC64 | |
1731 | /* Called with hard IRQs off */ | |
1732 | void notrace __ppc64_runlatch_on(void) | |
1733 | { | |
1734 | struct thread_info *ti = current_thread_info(); | |
1735 | unsigned long ctrl; | |
1736 | ||
1737 | ctrl = mfspr(SPRN_CTRLF); | |
1738 | ctrl |= CTRL_RUNLATCH; | |
1739 | mtspr(SPRN_CTRLT, ctrl); | |
1740 | ||
1741 | ti->local_flags |= _TLF_RUNLATCH; | |
1742 | } | |
1743 | ||
1744 | /* Called with hard IRQs off */ | |
1745 | void notrace __ppc64_runlatch_off(void) | |
1746 | { | |
1747 | struct thread_info *ti = current_thread_info(); | |
1748 | unsigned long ctrl; | |
1749 | ||
1750 | ti->local_flags &= ~_TLF_RUNLATCH; | |
1751 | ||
1752 | ctrl = mfspr(SPRN_CTRLF); | |
1753 | ctrl &= ~CTRL_RUNLATCH; | |
1754 | mtspr(SPRN_CTRLT, ctrl); | |
1755 | } | |
1756 | #endif /* CONFIG_PPC64 */ | |
1757 | ||
1758 | unsigned long arch_align_stack(unsigned long sp) | |
1759 | { | |
1760 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) | |
1761 | sp -= get_random_int() & ~PAGE_MASK; | |
1762 | return sp & ~0xf; | |
1763 | } | |
1764 | ||
1765 | static inline unsigned long brk_rnd(void) | |
1766 | { | |
1767 | unsigned long rnd = 0; | |
1768 | ||
1769 | /* 8MB for 32bit, 1GB for 64bit */ | |
1770 | if (is_32bit_task()) | |
1771 | rnd = (long)(get_random_int() % (1<<(23-PAGE_SHIFT))); | |
1772 | else | |
1773 | rnd = (long)(get_random_int() % (1<<(30-PAGE_SHIFT))); | |
1774 | ||
1775 | return rnd << PAGE_SHIFT; | |
1776 | } | |
1777 | ||
1778 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
1779 | { | |
1780 | unsigned long base = mm->brk; | |
1781 | unsigned long ret; | |
1782 | ||
1783 | #ifdef CONFIG_PPC_STD_MMU_64 | |
1784 | /* | |
1785 | * If we are using 1TB segments and we are allowed to randomise | |
1786 | * the heap, we can put it above 1TB so it is backed by a 1TB | |
1787 | * segment. Otherwise the heap will be in the bottom 1TB | |
1788 | * which always uses 256MB segments and this may result in a | |
1789 | * performance penalty. | |
1790 | */ | |
1791 | if (!is_32bit_task() && (mmu_highuser_ssize == MMU_SEGSIZE_1T)) | |
1792 | base = max_t(unsigned long, mm->brk, 1UL << SID_SHIFT_1T); | |
1793 | #endif | |
1794 | ||
1795 | ret = PAGE_ALIGN(base + brk_rnd()); | |
1796 | ||
1797 | if (ret < mm->brk) | |
1798 | return mm->brk; | |
1799 | ||
1800 | return ret; | |
1801 | } | |
1802 |