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1 | /* |
2 | * linux/arch/arm/mm/fault.c |
3 | * |
4 | * Copyright (C) 1995 Linus Torvalds |
5 | * Modifications for ARM processor (c) 1995-2004 Russell King |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as |
9 | * published by the Free Software Foundation. |
10 | */ |
11 | #include <linux/module.h> |
12 | #include <linux/signal.h> |
13 | #include <linux/mm.h> |
14 | #include <linux/hardirq.h> |
15 | #include <linux/init.h> |
16 | #include <linux/kprobes.h> |
17 | #include <linux/uaccess.h> |
18 | #include <linux/page-flags.h> |
19 | #include <linux/sched.h> |
20 | #include <linux/highmem.h> |
21 | #include <linux/perf_event.h> |
22 | |
23 | #include <asm/system.h> |
24 | #include <asm/pgtable.h> |
25 | #include <asm/tlbflush.h> |
26 | |
27 | #include "fault.h" |
28 | |
29 | /* |
30 | * Fault status register encodings. We steal bit 31 for our own purposes. |
31 | */ |
32 | #define FSR_LNX_PF (1 << 31) |
33 | #define FSR_WRITE (1 << 11) |
34 | #define FSR_FS4 (1 << 10) |
35 | #define FSR_FS3_0 (15) |
36 | |
37 | static inline int fsr_fs(unsigned int fsr) |
38 | { |
39 | return (fsr & FSR_FS3_0) | (fsr & FSR_FS4) >> 6; |
40 | } |
41 | |
42 | #ifdef CONFIG_MMU |
43 | |
44 | #ifdef CONFIG_KPROBES |
45 | static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr) |
46 | { |
47 | int ret = 0; |
48 | |
49 | if (!user_mode(regs)) { |
50 | /* kprobe_running() needs smp_processor_id() */ |
51 | preempt_disable(); |
52 | if (kprobe_running() && kprobe_fault_handler(regs, fsr)) |
53 | ret = 1; |
54 | preempt_enable(); |
55 | } |
56 | |
57 | return ret; |
58 | } |
59 | #else |
60 | static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr) |
61 | { |
62 | return 0; |
63 | } |
64 | #endif |
65 | |
66 | /* |
67 | * This is useful to dump out the page tables associated with |
68 | * 'addr' in mm 'mm'. |
69 | */ |
70 | void show_pte(struct mm_struct *mm, unsigned long addr) |
71 | { |
72 | pgd_t *pgd; |
73 | |
74 | if (!mm) |
75 | mm = &init_mm; |
76 | |
77 | printk(KERN_ALERT "pgd = %p\n", mm->pgd); |
78 | pgd = pgd_offset(mm, addr); |
79 | printk(KERN_ALERT "[%08lx] *pgd=%08lx", addr, pgd_val(*pgd)); |
80 | |
81 | do { |
82 | pmd_t *pmd; |
83 | pte_t *pte; |
84 | |
85 | if (pgd_none(*pgd)) |
86 | break; |
87 | |
88 | if (pgd_bad(*pgd)) { |
89 | printk("(bad)"); |
90 | break; |
91 | } |
92 | |
93 | pmd = pmd_offset(pgd, addr); |
94 | if (PTRS_PER_PMD != 1) |
95 | printk(", *pmd=%08lx", pmd_val(*pmd)); |
96 | |
97 | if (pmd_none(*pmd)) |
98 | break; |
99 | |
100 | if (pmd_bad(*pmd)) { |
101 | printk("(bad)"); |
102 | break; |
103 | } |
104 | |
105 | /* We must not map this if we have highmem enabled */ |
106 | if (PageHighMem(pfn_to_page(pmd_val(*pmd) >> PAGE_SHIFT))) |
107 | break; |
108 | |
109 | pte = pte_offset_map(pmd, addr); |
110 | printk(", *pte=%08lx", pte_val(*pte)); |
111 | printk(", *ppte=%08lx", pte_val(pte[-PTRS_PER_PTE])); |
112 | pte_unmap(pte); |
113 | } while(0); |
114 | |
115 | printk("\n"); |
116 | } |
117 | #else /* CONFIG_MMU */ |
118 | void show_pte(struct mm_struct *mm, unsigned long addr) |
119 | { } |
120 | #endif /* CONFIG_MMU */ |
121 | |
122 | /* |
123 | * Oops. The kernel tried to access some page that wasn't present. |
124 | */ |
125 | static void |
126 | __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, |
127 | struct pt_regs *regs) |
128 | { |
129 | /* |
130 | * Are we prepared to handle this kernel fault? |
131 | */ |
132 | if (fixup_exception(regs)) |
133 | return; |
134 | |
135 | /* |
136 | * No handler, we'll have to terminate things with extreme prejudice. |
137 | */ |
138 | bust_spinlocks(1); |
139 | printk(KERN_ALERT |
140 | "Unable to handle kernel %s at virtual address %08lx\n", |
141 | (addr < PAGE_SIZE) ? "NULL pointer dereference" : |
142 | "paging request", addr); |
143 | |
144 | show_pte(mm, addr); |
145 | die("Oops", regs, fsr); |
146 | bust_spinlocks(0); |
147 | do_exit(SIGKILL); |
148 | } |
149 | |
150 | /* |
151 | * Something tried to access memory that isn't in our memory map.. |
152 | * User mode accesses just cause a SIGSEGV |
153 | */ |
154 | static void |
155 | __do_user_fault(struct task_struct *tsk, unsigned long addr, |
156 | unsigned int fsr, unsigned int sig, int code, |
157 | struct pt_regs *regs) |
158 | { |
159 | struct siginfo si; |
160 | |
161 | #ifdef CONFIG_DEBUG_USER |
162 | if (user_debug & UDBG_SEGV) { |
163 | printk(KERN_DEBUG "%s: unhandled page fault (%d) at 0x%08lx, code 0x%03x\n", |
164 | tsk->comm, sig, addr, fsr); |
165 | show_pte(tsk->mm, addr); |
166 | show_regs(regs); |
167 | } |
168 | #endif |
169 | |
170 | tsk->thread.address = addr; |
171 | tsk->thread.error_code = fsr; |
172 | tsk->thread.trap_no = 14; |
173 | si.si_signo = sig; |
174 | si.si_errno = 0; |
175 | si.si_code = code; |
176 | si.si_addr = (void __user *)addr; |
177 | force_sig_info(sig, &si, tsk); |
178 | } |
179 | |
180 | void do_bad_area(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
181 | { |
182 | struct task_struct *tsk = current; |
183 | struct mm_struct *mm = tsk->active_mm; |
184 | |
185 | /* |
186 | * If we are in kernel mode at this point, we |
187 | * have no context to handle this fault with. |
188 | */ |
189 | if (user_mode(regs)) |
190 | __do_user_fault(tsk, addr, fsr, SIGSEGV, SEGV_MAPERR, regs); |
191 | else |
192 | __do_kernel_fault(mm, addr, fsr, regs); |
193 | } |
194 | |
195 | #ifdef CONFIG_MMU |
196 | #define VM_FAULT_BADMAP 0x010000 |
197 | #define VM_FAULT_BADACCESS 0x020000 |
198 | |
199 | /* |
200 | * Check that the permissions on the VMA allow for the fault which occurred. |
201 | * If we encountered a write fault, we must have write permission, otherwise |
202 | * we allow any permission. |
203 | */ |
204 | static inline bool access_error(unsigned int fsr, struct vm_area_struct *vma) |
205 | { |
206 | unsigned int mask = VM_READ | VM_WRITE | VM_EXEC; |
207 | |
208 | if (fsr & FSR_WRITE) |
209 | mask = VM_WRITE; |
210 | if (fsr & FSR_LNX_PF) |
211 | mask = VM_EXEC; |
212 | |
213 | return vma->vm_flags & mask ? false : true; |
214 | } |
215 | |
216 | static int __kprobes |
217 | __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, |
218 | struct task_struct *tsk) |
219 | { |
220 | struct vm_area_struct *vma; |
221 | int fault; |
222 | |
223 | vma = find_vma(mm, addr); |
224 | fault = VM_FAULT_BADMAP; |
225 | if (unlikely(!vma)) |
226 | goto out; |
227 | if (unlikely(vma->vm_start > addr)) |
228 | goto check_stack; |
229 | |
230 | /* |
231 | * Ok, we have a good vm_area for this |
232 | * memory access, so we can handle it. |
233 | */ |
234 | good_area: |
235 | if (access_error(fsr, vma)) { |
236 | fault = VM_FAULT_BADACCESS; |
237 | goto out; |
238 | } |
239 | |
240 | /* |
241 | * If for any reason at all we couldn't handle the fault, make |
242 | * sure we exit gracefully rather than endlessly redo the fault. |
243 | */ |
244 | fault = handle_mm_fault(mm, vma, addr & PAGE_MASK, (fsr & FSR_WRITE) ? FAULT_FLAG_WRITE : 0); |
245 | if (unlikely(fault & VM_FAULT_ERROR)) |
246 | return fault; |
247 | if (fault & VM_FAULT_MAJOR) |
248 | tsk->maj_flt++; |
249 | else |
250 | tsk->min_flt++; |
251 | return fault; |
252 | |
253 | check_stack: |
254 | if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr)) |
255 | goto good_area; |
256 | out: |
257 | return fault; |
258 | } |
259 | |
260 | static int __kprobes |
261 | do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
262 | { |
263 | struct task_struct *tsk; |
264 | struct mm_struct *mm; |
265 | int fault, sig, code; |
266 | |
267 | if (notify_page_fault(regs, fsr)) |
268 | return 0; |
269 | |
270 | tsk = current; |
271 | mm = tsk->mm; |
272 | |
273 | /* |
274 | * If we're in an interrupt or have no user |
275 | * context, we must not take the fault.. |
276 | */ |
277 | if (in_atomic() || !mm) |
278 | goto no_context; |
279 | |
280 | /* |
281 | * As per x86, we may deadlock here. However, since the kernel only |
282 | * validly references user space from well defined areas of the code, |
283 | * we can bug out early if this is from code which shouldn't. |
284 | */ |
285 | if (!down_read_trylock(&mm->mmap_sem)) { |
286 | if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc)) |
287 | goto no_context; |
288 | down_read(&mm->mmap_sem); |
289 | } else { |
290 | /* |
291 | * The above down_read_trylock() might have succeeded in |
292 | * which case, we'll have missed the might_sleep() from |
293 | * down_read() |
294 | */ |
295 | might_sleep(); |
296 | #ifdef CONFIG_DEBUG_VM |
297 | if (!user_mode(regs) && |
298 | !search_exception_tables(regs->ARM_pc)) |
299 | goto no_context; |
300 | #endif |
301 | } |
302 | |
303 | fault = __do_page_fault(mm, addr, fsr, tsk); |
304 | up_read(&mm->mmap_sem); |
305 | |
306 | perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, addr); |
307 | if (fault & VM_FAULT_MAJOR) |
308 | perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0, regs, addr); |
309 | else if (fault & VM_FAULT_MINOR) |
310 | perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0, regs, addr); |
311 | |
312 | /* |
313 | * Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR |
314 | */ |
315 | if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS)))) |
316 | return 0; |
317 | |
318 | if (fault & VM_FAULT_OOM) { |
319 | /* |
320 | * We ran out of memory, call the OOM killer, and return to |
321 | * userspace (which will retry the fault, or kill us if we |
322 | * got oom-killed) |
323 | */ |
324 | pagefault_out_of_memory(); |
325 | return 0; |
326 | } |
327 | |
328 | /* |
329 | * If we are in kernel mode at this point, we |
330 | * have no context to handle this fault with. |
331 | */ |
332 | if (!user_mode(regs)) |
333 | goto no_context; |
334 | |
335 | if (fault & VM_FAULT_SIGBUS) { |
336 | /* |
337 | * We had some memory, but were unable to |
338 | * successfully fix up this page fault. |
339 | */ |
340 | sig = SIGBUS; |
341 | code = BUS_ADRERR; |
342 | } else { |
343 | /* |
344 | * Something tried to access memory that |
345 | * isn't in our memory map.. |
346 | */ |
347 | sig = SIGSEGV; |
348 | code = fault == VM_FAULT_BADACCESS ? |
349 | SEGV_ACCERR : SEGV_MAPERR; |
350 | } |
351 | |
352 | __do_user_fault(tsk, addr, fsr, sig, code, regs); |
353 | return 0; |
354 | |
355 | no_context: |
356 | __do_kernel_fault(mm, addr, fsr, regs); |
357 | return 0; |
358 | } |
359 | #else /* CONFIG_MMU */ |
360 | static int |
361 | do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
362 | { |
363 | return 0; |
364 | } |
365 | #endif /* CONFIG_MMU */ |
366 | |
367 | /* |
368 | * First Level Translation Fault Handler |
369 | * |
370 | * We enter here because the first level page table doesn't contain |
371 | * a valid entry for the address. |
372 | * |
373 | * If the address is in kernel space (>= TASK_SIZE), then we are |
374 | * probably faulting in the vmalloc() area. |
375 | * |
376 | * If the init_task's first level page tables contains the relevant |
377 | * entry, we copy the it to this task. If not, we send the process |
378 | * a signal, fixup the exception, or oops the kernel. |
379 | * |
380 | * NOTE! We MUST NOT take any locks for this case. We may be in an |
381 | * interrupt or a critical region, and should only copy the information |
382 | * from the master page table, nothing more. |
383 | */ |
384 | #ifdef CONFIG_MMU |
385 | static int __kprobes |
386 | do_translation_fault(unsigned long addr, unsigned int fsr, |
387 | struct pt_regs *regs) |
388 | { |
389 | unsigned int index; |
390 | pgd_t *pgd, *pgd_k; |
391 | pmd_t *pmd, *pmd_k; |
392 | |
393 | if (addr < TASK_SIZE) |
394 | return do_page_fault(addr, fsr, regs); |
395 | |
396 | if (user_mode(regs)) |
397 | goto bad_area; |
398 | |
399 | index = pgd_index(addr); |
400 | |
401 | /* |
402 | * FIXME: CP15 C1 is write only on ARMv3 architectures. |
403 | */ |
404 | pgd = cpu_get_pgd() + index; |
405 | pgd_k = init_mm.pgd + index; |
406 | |
407 | if (pgd_none(*pgd_k)) |
408 | goto bad_area; |
409 | |
410 | if (!pgd_present(*pgd)) |
411 | set_pgd(pgd, *pgd_k); |
412 | |
413 | pmd_k = pmd_offset(pgd_k, addr); |
414 | pmd = pmd_offset(pgd, addr); |
415 | |
416 | /* |
417 | * On ARM one Linux PGD entry contains two hardware entries (see page |
418 | * tables layout in pgtable.h). We normally guarantee that we always |
419 | * fill both L1 entries. But create_mapping() doesn't follow the rule. |
420 | * It can create inidividual L1 entries, so here we have to call |
421 | * pmd_none() check for the entry really corresponded to address, not |
422 | * for the first of pair. |
423 | */ |
424 | index = (addr >> SECTION_SHIFT) & 1; |
425 | if (pmd_none(pmd_k[index])) |
426 | goto bad_area; |
427 | |
428 | copy_pmd(pmd, pmd_k); |
429 | return 0; |
430 | |
431 | bad_area: |
432 | do_bad_area(addr, fsr, regs); |
433 | return 0; |
434 | } |
435 | #else /* CONFIG_MMU */ |
436 | static int |
437 | do_translation_fault(unsigned long addr, unsigned int fsr, |
438 | struct pt_regs *regs) |
439 | { |
440 | return 0; |
441 | } |
442 | #endif /* CONFIG_MMU */ |
443 | |
444 | /* |
445 | * Some section permission faults need to be handled gracefully. |
446 | * They can happen due to a __{get,put}_user during an oops. |
447 | */ |
448 | static int |
449 | do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
450 | { |
451 | do_bad_area(addr, fsr, regs); |
452 | return 0; |
453 | } |
454 | |
455 | /* |
456 | * This abort handler always returns "fault". |
457 | */ |
458 | static int |
459 | do_bad(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
460 | { |
461 | return 1; |
462 | } |
463 | |
464 | static struct fsr_info { |
465 | int (*fn)(unsigned long addr, unsigned int fsr, struct pt_regs *regs); |
466 | int sig; |
467 | int code; |
468 | const char *name; |
469 | } fsr_info[] = { |
470 | /* |
471 | * The following are the standard ARMv3 and ARMv4 aborts. ARMv5 |
472 | * defines these to be "precise" aborts. |
473 | */ |
474 | { do_bad, SIGSEGV, 0, "vector exception" }, |
475 | { do_bad, SIGBUS, BUS_ADRALN, "alignment exception" }, |
476 | { do_bad, SIGKILL, 0, "terminal exception" }, |
477 | { do_bad, SIGBUS, BUS_ADRALN, "alignment exception" }, |
478 | { do_bad, SIGBUS, 0, "external abort on linefetch" }, |
479 | { do_translation_fault, SIGSEGV, SEGV_MAPERR, "section translation fault" }, |
480 | { do_bad, SIGBUS, 0, "external abort on linefetch" }, |
481 | { do_page_fault, SIGSEGV, SEGV_MAPERR, "page translation fault" }, |
482 | { do_bad, SIGBUS, 0, "external abort on non-linefetch" }, |
483 | { do_bad, SIGSEGV, SEGV_ACCERR, "section domain fault" }, |
484 | { do_bad, SIGBUS, 0, "external abort on non-linefetch" }, |
485 | { do_bad, SIGSEGV, SEGV_ACCERR, "page domain fault" }, |
486 | { do_bad, SIGBUS, 0, "external abort on translation" }, |
487 | { do_sect_fault, SIGSEGV, SEGV_ACCERR, "section permission fault" }, |
488 | { do_bad, SIGBUS, 0, "external abort on translation" }, |
489 | { do_page_fault, SIGSEGV, SEGV_ACCERR, "page permission fault" }, |
490 | /* |
491 | * The following are "imprecise" aborts, which are signalled by bit |
492 | * 10 of the FSR, and may not be recoverable. These are only |
493 | * supported if the CPU abort handler supports bit 10. |
494 | */ |
495 | { do_bad, SIGBUS, 0, "unknown 16" }, |
496 | { do_bad, SIGBUS, 0, "unknown 17" }, |
497 | { do_bad, SIGBUS, 0, "unknown 18" }, |
498 | { do_bad, SIGBUS, 0, "unknown 19" }, |
499 | { do_bad, SIGBUS, 0, "lock abort" }, /* xscale */ |
500 | { do_bad, SIGBUS, 0, "unknown 21" }, |
501 | { do_bad, SIGBUS, BUS_OBJERR, "imprecise external abort" }, /* xscale */ |
502 | { do_bad, SIGBUS, 0, "unknown 23" }, |
503 | { do_bad, SIGBUS, 0, "dcache parity error" }, /* xscale */ |
504 | { do_bad, SIGBUS, 0, "unknown 25" }, |
505 | { do_bad, SIGBUS, 0, "unknown 26" }, |
506 | { do_bad, SIGBUS, 0, "unknown 27" }, |
507 | { do_bad, SIGBUS, 0, "unknown 28" }, |
508 | { do_bad, SIGBUS, 0, "unknown 29" }, |
509 | { do_bad, SIGBUS, 0, "unknown 30" }, |
510 | { do_bad, SIGBUS, 0, "unknown 31" } |
511 | }; |
512 | |
513 | void __init |
514 | hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), |
515 | int sig, int code, const char *name) |
516 | { |
517 | if (nr < 0 || nr >= ARRAY_SIZE(fsr_info)) |
518 | BUG(); |
519 | |
520 | fsr_info[nr].fn = fn; |
521 | fsr_info[nr].sig = sig; |
522 | fsr_info[nr].code = code; |
523 | fsr_info[nr].name = name; |
524 | } |
525 | |
526 | /* |
527 | * Dispatch a data abort to the relevant handler. |
528 | */ |
529 | asmlinkage void __exception |
530 | do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
531 | { |
532 | const struct fsr_info *inf = fsr_info + fsr_fs(fsr); |
533 | struct siginfo info; |
534 | |
535 | if (!inf->fn(addr, fsr & ~FSR_LNX_PF, regs)) |
536 | return; |
537 | |
538 | printk(KERN_ALERT "Unhandled fault: %s (0x%03x) at 0x%08lx\n", |
539 | inf->name, fsr, addr); |
540 | |
541 | info.si_signo = inf->sig; |
542 | info.si_errno = 0; |
543 | info.si_code = inf->code; |
544 | info.si_addr = (void __user *)addr; |
545 | arm_notify_die("", regs, &info, fsr, 0); |
546 | } |
547 | |
548 | |
549 | static struct fsr_info ifsr_info[] = { |
550 | { do_bad, SIGBUS, 0, "unknown 0" }, |
551 | { do_bad, SIGBUS, 0, "unknown 1" }, |
552 | { do_bad, SIGBUS, 0, "debug event" }, |
553 | { do_bad, SIGSEGV, SEGV_ACCERR, "section access flag fault" }, |
554 | { do_bad, SIGBUS, 0, "unknown 4" }, |
555 | { do_translation_fault, SIGSEGV, SEGV_MAPERR, "section translation fault" }, |
556 | { do_bad, SIGSEGV, SEGV_ACCERR, "page access flag fault" }, |
557 | { do_page_fault, SIGSEGV, SEGV_MAPERR, "page translation fault" }, |
558 | { do_bad, SIGBUS, 0, "external abort on non-linefetch" }, |
559 | { do_bad, SIGSEGV, SEGV_ACCERR, "section domain fault" }, |
560 | { do_bad, SIGBUS, 0, "unknown 10" }, |
561 | { do_bad, SIGSEGV, SEGV_ACCERR, "page domain fault" }, |
562 | { do_bad, SIGBUS, 0, "external abort on translation" }, |
563 | { do_sect_fault, SIGSEGV, SEGV_ACCERR, "section permission fault" }, |
564 | { do_bad, SIGBUS, 0, "external abort on translation" }, |
565 | { do_page_fault, SIGSEGV, SEGV_ACCERR, "page permission fault" }, |
566 | { do_bad, SIGBUS, 0, "unknown 16" }, |
567 | { do_bad, SIGBUS, 0, "unknown 17" }, |
568 | { do_bad, SIGBUS, 0, "unknown 18" }, |
569 | { do_bad, SIGBUS, 0, "unknown 19" }, |
570 | { do_bad, SIGBUS, 0, "unknown 20" }, |
571 | { do_bad, SIGBUS, 0, "unknown 21" }, |
572 | { do_bad, SIGBUS, 0, "unknown 22" }, |
573 | { do_bad, SIGBUS, 0, "unknown 23" }, |
574 | { do_bad, SIGBUS, 0, "unknown 24" }, |
575 | { do_bad, SIGBUS, 0, "unknown 25" }, |
576 | { do_bad, SIGBUS, 0, "unknown 26" }, |
577 | { do_bad, SIGBUS, 0, "unknown 27" }, |
578 | { do_bad, SIGBUS, 0, "unknown 28" }, |
579 | { do_bad, SIGBUS, 0, "unknown 29" }, |
580 | { do_bad, SIGBUS, 0, "unknown 30" }, |
581 | { do_bad, SIGBUS, 0, "unknown 31" }, |
582 | }; |
583 | |
584 | void __init |
585 | hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), |
586 | int sig, int code, const char *name) |
587 | { |
588 | if (nr < 0 || nr >= ARRAY_SIZE(ifsr_info)) |
589 | BUG(); |
590 | |
591 | ifsr_info[nr].fn = fn; |
592 | ifsr_info[nr].sig = sig; |
593 | ifsr_info[nr].code = code; |
594 | ifsr_info[nr].name = name; |
595 | } |
596 | |
597 | asmlinkage void __exception |
598 | do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs) |
599 | { |
600 | const struct fsr_info *inf = ifsr_info + fsr_fs(ifsr); |
601 | struct siginfo info; |
602 | |
603 | if (!inf->fn(addr, ifsr | FSR_LNX_PF, regs)) |
604 | return; |
605 | |
606 | printk(KERN_ALERT "Unhandled prefetch abort: %s (0x%03x) at 0x%08lx\n", |
607 | inf->name, ifsr, addr); |
608 | |
609 | info.si_signo = inf->sig; |
610 | info.si_errno = 0; |
611 | info.si_code = inf->code; |
612 | info.si_addr = (void __user *)addr; |
613 | arm_notify_die("", regs, &info, ifsr, 0); |
614 | } |
615 | |
616 | static int __init exceptions_init(void) |
617 | { |
618 | if (cpu_architecture() >= CPU_ARCH_ARMv6) { |
619 | hook_fault_code(4, do_translation_fault, SIGSEGV, SEGV_MAPERR, |
620 | "I-cache maintenance fault"); |
621 | } |
622 | |
623 | if (cpu_architecture() >= CPU_ARCH_ARMv7) { |
624 | /* |
625 | * TODO: Access flag faults introduced in ARMv6K. |
626 | * Runtime check for 'K' extension is needed |
627 | */ |
628 | hook_fault_code(3, do_bad, SIGSEGV, SEGV_MAPERR, |
629 | "section access flag fault"); |
630 | hook_fault_code(6, do_bad, SIGSEGV, SEGV_MAPERR, |
631 | "section access flag fault"); |
632 | } |
633 | |
634 | return 0; |
635 | } |
636 | |
637 | arch_initcall(exceptions_init); |
638 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9