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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/traps.c | |
3 | * | |
4 | * Copyright (C) 1995-2002 Russell King | |
5 | * Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds | |
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 | * 'traps.c' handles hardware exceptions after we have saved some state in | |
12 | * 'linux/arch/arm/lib/traps.S'. Mostly a debugging aid, but will probably | |
13 | * kill the offending process. | |
14 | */ | |
15 | #include <linux/config.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/signal.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/personality.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/kallsyms.h> | |
22 | #include <linux/init.h> | |
23 | ||
24 | #include <asm/atomic.h> | |
25 | #include <asm/cacheflush.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/system.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/unistd.h> | |
30 | #include <asm/traps.h> | |
31 | ||
32 | #include "ptrace.h" | |
e00d349e | 33 | #include "signal.h" |
1da177e4 | 34 | |
1da177e4 LT |
35 | const char *processor_modes[]= |
36 | { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , | |
37 | "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", | |
38 | "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" , | |
39 | "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32" | |
40 | }; | |
41 | ||
42 | static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" }; | |
43 | ||
44 | #ifdef CONFIG_DEBUG_USER | |
45 | unsigned int user_debug; | |
46 | ||
47 | static int __init user_debug_setup(char *str) | |
48 | { | |
49 | get_option(&str, &user_debug); | |
50 | return 1; | |
51 | } | |
52 | __setup("user_debug=", user_debug_setup); | |
53 | #endif | |
54 | ||
55 | void dump_backtrace_entry(unsigned long where, unsigned long from) | |
56 | { | |
57 | #ifdef CONFIG_KALLSYMS | |
58 | printk("[<%08lx>] ", where); | |
59 | print_symbol("(%s) ", where); | |
60 | printk("from [<%08lx>] ", from); | |
61 | print_symbol("(%s)\n", from); | |
62 | #else | |
63 | printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from); | |
64 | #endif | |
65 | } | |
66 | ||
67 | /* | |
68 | * Stack pointers should always be within the kernels view of | |
69 | * physical memory. If it is not there, then we can't dump | |
70 | * out any information relating to the stack. | |
71 | */ | |
72 | static int verify_stack(unsigned long sp) | |
73 | { | |
74 | if (sp < PAGE_OFFSET || (sp > (unsigned long)high_memory && high_memory != 0)) | |
75 | return -EFAULT; | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | /* | |
81 | * Dump out the contents of some memory nicely... | |
82 | */ | |
83 | static void dump_mem(const char *str, unsigned long bottom, unsigned long top) | |
84 | { | |
85 | unsigned long p = bottom & ~31; | |
86 | mm_segment_t fs; | |
87 | int i; | |
88 | ||
89 | /* | |
90 | * We need to switch to kernel mode so that we can use __get_user | |
91 | * to safely read from kernel space. Note that we now dump the | |
92 | * code first, just in case the backtrace kills us. | |
93 | */ | |
94 | fs = get_fs(); | |
95 | set_fs(KERNEL_DS); | |
96 | ||
97 | printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top); | |
98 | ||
99 | for (p = bottom & ~31; p < top;) { | |
100 | printk("%04lx: ", p & 0xffff); | |
101 | ||
102 | for (i = 0; i < 8; i++, p += 4) { | |
103 | unsigned int val; | |
104 | ||
105 | if (p < bottom || p >= top) | |
106 | printk(" "); | |
107 | else { | |
108 | __get_user(val, (unsigned long *)p); | |
109 | printk("%08x ", val); | |
110 | } | |
111 | } | |
112 | printk ("\n"); | |
113 | } | |
114 | ||
115 | set_fs(fs); | |
116 | } | |
117 | ||
118 | static void dump_instr(struct pt_regs *regs) | |
119 | { | |
120 | unsigned long addr = instruction_pointer(regs); | |
121 | const int thumb = thumb_mode(regs); | |
122 | const int width = thumb ? 4 : 8; | |
123 | mm_segment_t fs; | |
124 | int i; | |
125 | ||
126 | /* | |
127 | * We need to switch to kernel mode so that we can use __get_user | |
128 | * to safely read from kernel space. Note that we now dump the | |
129 | * code first, just in case the backtrace kills us. | |
130 | */ | |
131 | fs = get_fs(); | |
132 | set_fs(KERNEL_DS); | |
133 | ||
134 | printk("Code: "); | |
135 | for (i = -4; i < 1; i++) { | |
136 | unsigned int val, bad; | |
137 | ||
138 | if (thumb) | |
139 | bad = __get_user(val, &((u16 *)addr)[i]); | |
140 | else | |
141 | bad = __get_user(val, &((u32 *)addr)[i]); | |
142 | ||
143 | if (!bad) | |
144 | printk(i == 0 ? "(%0*x) " : "%0*x ", width, val); | |
145 | else { | |
146 | printk("bad PC value."); | |
147 | break; | |
148 | } | |
149 | } | |
150 | printk("\n"); | |
151 | ||
152 | set_fs(fs); | |
153 | } | |
154 | ||
155 | static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) | |
156 | { | |
157 | unsigned int fp; | |
158 | int ok = 1; | |
159 | ||
160 | printk("Backtrace: "); | |
161 | fp = regs->ARM_fp; | |
162 | if (!fp) { | |
163 | printk("no frame pointer"); | |
164 | ok = 0; | |
165 | } else if (verify_stack(fp)) { | |
166 | printk("invalid frame pointer 0x%08x", fp); | |
167 | ok = 0; | |
168 | } else if (fp < (unsigned long)(tsk->thread_info + 1)) | |
169 | printk("frame pointer underflow"); | |
170 | printk("\n"); | |
171 | ||
172 | if (ok) | |
173 | c_backtrace(fp, processor_mode(regs)); | |
174 | } | |
175 | ||
176 | void dump_stack(void) | |
177 | { | |
178 | #ifdef CONFIG_DEBUG_ERRORS | |
179 | __backtrace(); | |
180 | #endif | |
181 | } | |
182 | ||
183 | EXPORT_SYMBOL(dump_stack); | |
184 | ||
185 | void show_stack(struct task_struct *tsk, unsigned long *sp) | |
186 | { | |
187 | unsigned long fp; | |
188 | ||
189 | if (!tsk) | |
190 | tsk = current; | |
191 | ||
192 | if (tsk != current) | |
193 | fp = thread_saved_fp(tsk); | |
194 | else | |
195 | asm("mov%? %0, fp" : "=r" (fp)); | |
196 | ||
197 | c_backtrace(fp, 0x10); | |
198 | barrier(); | |
199 | } | |
200 | ||
201 | DEFINE_SPINLOCK(die_lock); | |
202 | ||
203 | /* | |
204 | * This function is protected against re-entrancy. | |
205 | */ | |
206 | NORET_TYPE void die(const char *str, struct pt_regs *regs, int err) | |
207 | { | |
208 | struct task_struct *tsk = current; | |
209 | static int die_counter; | |
210 | ||
211 | console_verbose(); | |
212 | spin_lock_irq(&die_lock); | |
213 | bust_spinlocks(1); | |
214 | ||
215 | printk("Internal error: %s: %x [#%d]\n", str, err, ++die_counter); | |
216 | print_modules(); | |
652a12ef | 217 | __show_regs(regs); |
1da177e4 LT |
218 | printk("Process %s (pid: %d, stack limit = 0x%p)\n", |
219 | tsk->comm, tsk->pid, tsk->thread_info + 1); | |
220 | ||
221 | if (!user_mode(regs) || in_interrupt()) { | |
4f7a1812 RK |
222 | dump_mem("Stack: ", regs->ARM_sp, |
223 | THREAD_SIZE + (unsigned long)tsk->thread_info); | |
1da177e4 LT |
224 | dump_backtrace(regs, tsk); |
225 | dump_instr(regs); | |
226 | } | |
227 | ||
228 | bust_spinlocks(0); | |
229 | spin_unlock_irq(&die_lock); | |
230 | do_exit(SIGSEGV); | |
231 | } | |
232 | ||
cfb0810e RK |
233 | void notify_die(const char *str, struct pt_regs *regs, struct siginfo *info, |
234 | unsigned long err, unsigned long trap) | |
1da177e4 LT |
235 | { |
236 | if (user_mode(regs)) { | |
237 | current->thread.error_code = err; | |
238 | current->thread.trap_no = trap; | |
239 | ||
240 | force_sig_info(info->si_signo, info, current); | |
241 | } else { | |
242 | die(str, regs, err); | |
243 | } | |
244 | } | |
245 | ||
246 | static LIST_HEAD(undef_hook); | |
247 | static DEFINE_SPINLOCK(undef_lock); | |
248 | ||
249 | void register_undef_hook(struct undef_hook *hook) | |
250 | { | |
109d89ca RK |
251 | unsigned long flags; |
252 | ||
253 | spin_lock_irqsave(&undef_lock, flags); | |
1da177e4 | 254 | list_add(&hook->node, &undef_hook); |
109d89ca | 255 | spin_unlock_irqrestore(&undef_lock, flags); |
1da177e4 LT |
256 | } |
257 | ||
258 | void unregister_undef_hook(struct undef_hook *hook) | |
259 | { | |
109d89ca RK |
260 | unsigned long flags; |
261 | ||
262 | spin_lock_irqsave(&undef_lock, flags); | |
1da177e4 | 263 | list_del(&hook->node); |
109d89ca | 264 | spin_unlock_irqrestore(&undef_lock, flags); |
1da177e4 LT |
265 | } |
266 | ||
267 | asmlinkage void do_undefinstr(struct pt_regs *regs) | |
268 | { | |
269 | unsigned int correction = thumb_mode(regs) ? 2 : 4; | |
270 | unsigned int instr; | |
271 | struct undef_hook *hook; | |
272 | siginfo_t info; | |
273 | void __user *pc; | |
274 | ||
275 | /* | |
276 | * According to the ARM ARM, PC is 2 or 4 bytes ahead, | |
277 | * depending whether we're in Thumb mode or not. | |
278 | * Correct this offset. | |
279 | */ | |
280 | regs->ARM_pc -= correction; | |
281 | ||
282 | pc = (void __user *)instruction_pointer(regs); | |
283 | if (thumb_mode(regs)) { | |
284 | get_user(instr, (u16 __user *)pc); | |
285 | } else { | |
286 | get_user(instr, (u32 __user *)pc); | |
287 | } | |
288 | ||
289 | spin_lock_irq(&undef_lock); | |
290 | list_for_each_entry(hook, &undef_hook, node) { | |
291 | if ((instr & hook->instr_mask) == hook->instr_val && | |
292 | (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) { | |
293 | if (hook->fn(regs, instr) == 0) { | |
294 | spin_unlock_irq(&undef_lock); | |
295 | return; | |
296 | } | |
297 | } | |
298 | } | |
299 | spin_unlock_irq(&undef_lock); | |
300 | ||
301 | #ifdef CONFIG_DEBUG_USER | |
302 | if (user_debug & UDBG_UNDEFINED) { | |
303 | printk(KERN_INFO "%s (%d): undefined instruction: pc=%p\n", | |
304 | current->comm, current->pid, pc); | |
305 | dump_instr(regs); | |
306 | } | |
307 | #endif | |
308 | ||
309 | info.si_signo = SIGILL; | |
310 | info.si_errno = 0; | |
311 | info.si_code = ILL_ILLOPC; | |
312 | info.si_addr = pc; | |
313 | ||
314 | notify_die("Oops - undefined instruction", regs, &info, 0, 6); | |
315 | } | |
316 | ||
317 | asmlinkage void do_unexp_fiq (struct pt_regs *regs) | |
318 | { | |
319 | #ifndef CONFIG_IGNORE_FIQ | |
320 | printk("Hmm. Unexpected FIQ received, but trying to continue\n"); | |
321 | printk("You may have a hardware problem...\n"); | |
322 | #endif | |
323 | } | |
324 | ||
325 | /* | |
326 | * bad_mode handles the impossible case in the vectors. If you see one of | |
327 | * these, then it's extremely serious, and could mean you have buggy hardware. | |
328 | * It never returns, and never tries to sync. We hope that we can at least | |
329 | * dump out some state information... | |
330 | */ | |
331 | asmlinkage void bad_mode(struct pt_regs *regs, int reason, int proc_mode) | |
332 | { | |
333 | console_verbose(); | |
334 | ||
335 | printk(KERN_CRIT "Bad mode in %s handler detected: mode %s\n", | |
336 | handler[reason], processor_modes[proc_mode]); | |
337 | ||
338 | die("Oops - bad mode", regs, 0); | |
339 | local_irq_disable(); | |
340 | panic("bad mode"); | |
341 | } | |
342 | ||
343 | static int bad_syscall(int n, struct pt_regs *regs) | |
344 | { | |
345 | struct thread_info *thread = current_thread_info(); | |
346 | siginfo_t info; | |
347 | ||
a999cb04 NP |
348 | if (current->personality != PER_LINUX && |
349 | current->personality != PER_LINUX_32BIT && | |
350 | thread->exec_domain->handler) { | |
1da177e4 LT |
351 | thread->exec_domain->handler(n, regs); |
352 | return regs->ARM_r0; | |
353 | } | |
354 | ||
355 | #ifdef CONFIG_DEBUG_USER | |
356 | if (user_debug & UDBG_SYSCALL) { | |
357 | printk(KERN_ERR "[%d] %s: obsolete system call %08x.\n", | |
358 | current->pid, current->comm, n); | |
359 | dump_instr(regs); | |
360 | } | |
361 | #endif | |
362 | ||
363 | info.si_signo = SIGILL; | |
364 | info.si_errno = 0; | |
365 | info.si_code = ILL_ILLTRP; | |
366 | info.si_addr = (void __user *)instruction_pointer(regs) - | |
367 | (thumb_mode(regs) ? 2 : 4); | |
368 | ||
369 | notify_die("Oops - bad syscall", regs, &info, n, 0); | |
370 | ||
371 | return regs->ARM_r0; | |
372 | } | |
373 | ||
374 | static inline void | |
375 | do_cache_op(unsigned long start, unsigned long end, int flags) | |
376 | { | |
377 | struct vm_area_struct *vma; | |
378 | ||
379 | if (end < start || flags) | |
380 | return; | |
381 | ||
382 | vma = find_vma(current->active_mm, start); | |
383 | if (vma && vma->vm_start < end) { | |
384 | if (start < vma->vm_start) | |
385 | start = vma->vm_start; | |
386 | if (end > vma->vm_end) | |
387 | end = vma->vm_end; | |
388 | ||
389 | flush_cache_user_range(vma, start, end); | |
390 | } | |
391 | } | |
392 | ||
393 | /* | |
394 | * Handle all unrecognised system calls. | |
395 | * 0x9f0000 - 0x9fffff are some more esoteric system calls | |
396 | */ | |
397 | #define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE) | |
398 | asmlinkage int arm_syscall(int no, struct pt_regs *regs) | |
399 | { | |
400 | struct thread_info *thread = current_thread_info(); | |
401 | siginfo_t info; | |
402 | ||
403 | if ((no >> 16) != 0x9f) | |
404 | return bad_syscall(no, regs); | |
405 | ||
406 | switch (no & 0xffff) { | |
407 | case 0: /* branch through 0 */ | |
408 | info.si_signo = SIGSEGV; | |
409 | info.si_errno = 0; | |
410 | info.si_code = SEGV_MAPERR; | |
411 | info.si_addr = NULL; | |
412 | ||
413 | notify_die("branch through zero", regs, &info, 0, 0); | |
414 | return 0; | |
415 | ||
416 | case NR(breakpoint): /* SWI BREAK_POINT */ | |
417 | regs->ARM_pc -= thumb_mode(regs) ? 2 : 4; | |
418 | ptrace_break(current, regs); | |
419 | return regs->ARM_r0; | |
420 | ||
421 | /* | |
422 | * Flush a region from virtual address 'r0' to virtual address 'r1' | |
423 | * _exclusive_. There is no alignment requirement on either address; | |
424 | * user space does not need to know the hardware cache layout. | |
425 | * | |
426 | * r2 contains flags. It should ALWAYS be passed as ZERO until it | |
427 | * is defined to be something else. For now we ignore it, but may | |
428 | * the fires of hell burn in your belly if you break this rule. ;) | |
429 | * | |
430 | * (at a later date, we may want to allow this call to not flush | |
431 | * various aspects of the cache. Passing '0' will guarantee that | |
432 | * everything necessary gets flushed to maintain consistency in | |
433 | * the specified region). | |
434 | */ | |
435 | case NR(cacheflush): | |
436 | do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2); | |
437 | return 0; | |
438 | ||
439 | case NR(usr26): | |
440 | if (!(elf_hwcap & HWCAP_26BIT)) | |
441 | break; | |
442 | regs->ARM_cpsr &= ~MODE32_BIT; | |
443 | return regs->ARM_r0; | |
444 | ||
445 | case NR(usr32): | |
446 | if (!(elf_hwcap & HWCAP_26BIT)) | |
447 | break; | |
448 | regs->ARM_cpsr |= MODE32_BIT; | |
449 | return regs->ARM_r0; | |
450 | ||
451 | case NR(set_tls): | |
452 | thread->tp_value = regs->ARM_r0; | |
4b0e07a5 | 453 | #if defined(CONFIG_HAS_TLS_REG) |
2d2669b6 | 454 | asm ("mcr p15, 0, %0, c13, c0, 3" : : "r" (regs->ARM_r0) ); |
4b0e07a5 | 455 | #elif !defined(CONFIG_TLS_REG_EMUL) |
1da177e4 | 456 | /* |
2d2669b6 NP |
457 | * User space must never try to access this directly. |
458 | * Expect your app to break eventually if you do so. | |
459 | * The user helper at 0xffff0fe0 must be used instead. | |
460 | * (see entry-armv.S for details) | |
1da177e4 | 461 | */ |
2d2669b6 NP |
462 | *((unsigned int *)0xffff0ff0) = regs->ARM_r0; |
463 | #endif | |
1da177e4 LT |
464 | return 0; |
465 | ||
dcef1f63 NP |
466 | #ifdef CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG |
467 | /* | |
468 | * Atomically store r1 in *r2 if *r2 is equal to r0 for user space. | |
469 | * Return zero in r0 if *MEM was changed or non-zero if no exchange | |
470 | * happened. Also set the user C flag accordingly. | |
471 | * If access permissions have to be fixed up then non-zero is | |
472 | * returned and the operation has to be re-attempted. | |
473 | * | |
474 | * *NOTE*: This is a ghost syscall private to the kernel. Only the | |
475 | * __kuser_cmpxchg code in entry-armv.S should be aware of its | |
476 | * existence. Don't ever use this from user code. | |
477 | */ | |
478 | case 0xfff0: | |
479 | { | |
480 | extern void do_DataAbort(unsigned long addr, unsigned int fsr, | |
481 | struct pt_regs *regs); | |
482 | unsigned long val; | |
483 | unsigned long addr = regs->ARM_r2; | |
484 | struct mm_struct *mm = current->mm; | |
485 | pgd_t *pgd; pmd_t *pmd; pte_t *pte; | |
486 | ||
487 | regs->ARM_cpsr &= ~PSR_C_BIT; | |
488 | spin_lock(&mm->page_table_lock); | |
489 | pgd = pgd_offset(mm, addr); | |
490 | if (!pgd_present(*pgd)) | |
491 | goto bad_access; | |
492 | pmd = pmd_offset(pgd, addr); | |
493 | if (!pmd_present(*pmd)) | |
494 | goto bad_access; | |
495 | pte = pte_offset_map(pmd, addr); | |
496 | if (!pte_present(*pte) || !pte_write(*pte)) | |
497 | goto bad_access; | |
498 | val = *(unsigned long *)addr; | |
499 | val -= regs->ARM_r0; | |
500 | if (val == 0) { | |
501 | *(unsigned long *)addr = regs->ARM_r1; | |
502 | regs->ARM_cpsr |= PSR_C_BIT; | |
503 | } | |
504 | spin_unlock(&mm->page_table_lock); | |
505 | return val; | |
506 | ||
507 | bad_access: | |
508 | spin_unlock(&mm->page_table_lock); | |
74f88494 | 509 | /* simulate a write access fault */ |
dcef1f63 NP |
510 | do_DataAbort(addr, 15 + (1 << 11), regs); |
511 | return -1; | |
512 | } | |
513 | #endif | |
514 | ||
1da177e4 LT |
515 | default: |
516 | /* Calls 9f00xx..9f07ff are defined to return -ENOSYS | |
517 | if not implemented, rather than raising SIGILL. This | |
518 | way the calling program can gracefully determine whether | |
519 | a feature is supported. */ | |
520 | if (no <= 0x7ff) | |
521 | return -ENOSYS; | |
522 | break; | |
523 | } | |
524 | #ifdef CONFIG_DEBUG_USER | |
525 | /* | |
526 | * experience shows that these seem to indicate that | |
527 | * something catastrophic has happened | |
528 | */ | |
529 | if (user_debug & UDBG_SYSCALL) { | |
530 | printk("[%d] %s: arm syscall %d\n", | |
531 | current->pid, current->comm, no); | |
532 | dump_instr(regs); | |
533 | if (user_mode(regs)) { | |
652a12ef | 534 | __show_regs(regs); |
1da177e4 LT |
535 | c_backtrace(regs->ARM_fp, processor_mode(regs)); |
536 | } | |
537 | } | |
538 | #endif | |
539 | info.si_signo = SIGILL; | |
540 | info.si_errno = 0; | |
541 | info.si_code = ILL_ILLTRP; | |
542 | info.si_addr = (void __user *)instruction_pointer(regs) - | |
543 | (thumb_mode(regs) ? 2 : 4); | |
544 | ||
545 | notify_die("Oops - bad syscall(2)", regs, &info, no, 0); | |
546 | return 0; | |
547 | } | |
548 | ||
4b0e07a5 | 549 | #ifdef CONFIG_TLS_REG_EMUL |
2d2669b6 NP |
550 | |
551 | /* | |
552 | * We might be running on an ARMv6+ processor which should have the TLS | |
4b0e07a5 NP |
553 | * register but for some reason we can't use it, or maybe an SMP system |
554 | * using a pre-ARMv6 processor (there are apparently a few prototypes like | |
555 | * that in existence) and therefore access to that register must be | |
556 | * emulated. | |
2d2669b6 NP |
557 | */ |
558 | ||
559 | static int get_tp_trap(struct pt_regs *regs, unsigned int instr) | |
560 | { | |
561 | int reg = (instr >> 12) & 15; | |
562 | if (reg == 15) | |
563 | return 1; | |
564 | regs->uregs[reg] = current_thread_info()->tp_value; | |
565 | regs->ARM_pc += 4; | |
566 | return 0; | |
567 | } | |
568 | ||
569 | static struct undef_hook arm_mrc_hook = { | |
570 | .instr_mask = 0x0fff0fff, | |
571 | .instr_val = 0x0e1d0f70, | |
572 | .cpsr_mask = PSR_T_BIT, | |
573 | .cpsr_val = 0, | |
574 | .fn = get_tp_trap, | |
575 | }; | |
576 | ||
577 | static int __init arm_mrc_hook_init(void) | |
578 | { | |
579 | register_undef_hook(&arm_mrc_hook); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | late_initcall(arm_mrc_hook_init); | |
584 | ||
585 | #endif | |
586 | ||
1da177e4 LT |
587 | void __bad_xchg(volatile void *ptr, int size) |
588 | { | |
589 | printk("xchg: bad data size: pc 0x%p, ptr 0x%p, size %d\n", | |
590 | __builtin_return_address(0), ptr, size); | |
591 | BUG(); | |
592 | } | |
593 | EXPORT_SYMBOL(__bad_xchg); | |
594 | ||
595 | /* | |
596 | * A data abort trap was taken, but we did not handle the instruction. | |
597 | * Try to abort the user program, or panic if it was the kernel. | |
598 | */ | |
599 | asmlinkage void | |
600 | baddataabort(int code, unsigned long instr, struct pt_regs *regs) | |
601 | { | |
602 | unsigned long addr = instruction_pointer(regs); | |
603 | siginfo_t info; | |
604 | ||
605 | #ifdef CONFIG_DEBUG_USER | |
606 | if (user_debug & UDBG_BADABORT) { | |
607 | printk(KERN_ERR "[%d] %s: bad data abort: code %d instr 0x%08lx\n", | |
608 | current->pid, current->comm, code, instr); | |
609 | dump_instr(regs); | |
610 | show_pte(current->mm, addr); | |
611 | } | |
612 | #endif | |
613 | ||
614 | info.si_signo = SIGILL; | |
615 | info.si_errno = 0; | |
616 | info.si_code = ILL_ILLOPC; | |
617 | info.si_addr = (void __user *)addr; | |
618 | ||
619 | notify_die("unknown data abort code", regs, &info, instr, 0); | |
620 | } | |
621 | ||
33215652 | 622 | void __attribute__((noreturn)) __bug(const char *file, int line, void *data) |
1da177e4 LT |
623 | { |
624 | printk(KERN_CRIT"kernel BUG at %s:%d!", file, line); | |
625 | if (data) | |
626 | printk(" - extra data = %p", data); | |
627 | printk("\n"); | |
628 | *(int *)0 = 0; | |
6a1ced59 CM |
629 | |
630 | /* Avoid "noreturn function does return" */ | |
631 | for (;;); | |
1da177e4 LT |
632 | } |
633 | EXPORT_SYMBOL(__bug); | |
634 | ||
635 | void __readwrite_bug(const char *fn) | |
636 | { | |
637 | printk("%s called, but not implemented\n", fn); | |
638 | BUG(); | |
639 | } | |
640 | EXPORT_SYMBOL(__readwrite_bug); | |
641 | ||
642 | void __pte_error(const char *file, int line, unsigned long val) | |
643 | { | |
644 | printk("%s:%d: bad pte %08lx.\n", file, line, val); | |
645 | } | |
646 | ||
647 | void __pmd_error(const char *file, int line, unsigned long val) | |
648 | { | |
649 | printk("%s:%d: bad pmd %08lx.\n", file, line, val); | |
650 | } | |
651 | ||
652 | void __pgd_error(const char *file, int line, unsigned long val) | |
653 | { | |
654 | printk("%s:%d: bad pgd %08lx.\n", file, line, val); | |
655 | } | |
656 | ||
657 | asmlinkage void __div0(void) | |
658 | { | |
659 | printk("Division by zero in kernel.\n"); | |
660 | dump_stack(); | |
661 | } | |
662 | EXPORT_SYMBOL(__div0); | |
663 | ||
664 | void abort(void) | |
665 | { | |
666 | BUG(); | |
667 | ||
668 | /* if that doesn't kill us, halt */ | |
669 | panic("Oops failed to kill thread"); | |
670 | } | |
671 | EXPORT_SYMBOL(abort); | |
672 | ||
673 | void __init trap_init(void) | |
674 | { | |
7933523d RK |
675 | extern char __stubs_start[], __stubs_end[]; |
676 | extern char __vectors_start[], __vectors_end[]; | |
2d2669b6 NP |
677 | extern char __kuser_helper_start[], __kuser_helper_end[]; |
678 | int kuser_sz = __kuser_helper_end - __kuser_helper_start; | |
1da177e4 | 679 | |
7933523d | 680 | /* |
2d2669b6 NP |
681 | * Copy the vectors, stubs and kuser helpers (in entry-armv.S) |
682 | * into the vector page, mapped at 0xffff0000, and ensure these | |
683 | * are visible to the instruction stream. | |
7933523d RK |
684 | */ |
685 | memcpy((void *)0xffff0000, __vectors_start, __vectors_end - __vectors_start); | |
686 | memcpy((void *)0xffff0200, __stubs_start, __stubs_end - __stubs_start); | |
2d2669b6 | 687 | memcpy((void *)0xffff1000 - kuser_sz, __kuser_helper_start, kuser_sz); |
e00d349e RK |
688 | |
689 | /* | |
690 | * Copy signal return handlers into the vector page, and | |
691 | * set sigreturn to be a pointer to these. | |
692 | */ | |
693 | memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes, | |
694 | sizeof(sigreturn_codes)); | |
695 | ||
1da177e4 LT |
696 | flush_icache_range(0xffff0000, 0xffff0000 + PAGE_SIZE); |
697 | modify_domain(DOMAIN_USER, DOMAIN_CLIENT); | |
698 | } |