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60ffc30d CM |
1 | /* |
2 | * Based on arch/arm/kernel/traps.c | |
3 | * | |
4 | * Copyright (C) 1995-2009 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
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 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/signal.h> | |
21 | #include <linux/personality.h> | |
22 | #include <linux/kallsyms.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/uaccess.h> | |
25 | #include <linux/hardirq.h> | |
26 | #include <linux/kdebug.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/kexec.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/sched.h> | |
32 | #include <linux/syscalls.h> | |
33 | ||
34 | #include <asm/atomic.h> | |
1442b6ed | 35 | #include <asm/debug-monitors.h> |
60ffc30d CM |
36 | #include <asm/traps.h> |
37 | #include <asm/stacktrace.h> | |
38 | #include <asm/exception.h> | |
39 | #include <asm/system_misc.h> | |
40 | ||
41 | static const char *handler[]= { | |
42 | "Synchronous Abort", | |
43 | "IRQ", | |
44 | "FIQ", | |
45 | "Error" | |
46 | }; | |
47 | ||
48 | int show_unhandled_signals = 1; | |
49 | ||
50 | /* | |
51 | * Dump out the contents of some memory nicely... | |
52 | */ | |
53 | static void dump_mem(const char *lvl, const char *str, unsigned long bottom, | |
54 | unsigned long top) | |
55 | { | |
56 | unsigned long first; | |
57 | mm_segment_t fs; | |
58 | int i; | |
59 | ||
60 | /* | |
61 | * We need to switch to kernel mode so that we can use __get_user | |
62 | * to safely read from kernel space. Note that we now dump the | |
63 | * code first, just in case the backtrace kills us. | |
64 | */ | |
65 | fs = get_fs(); | |
66 | set_fs(KERNEL_DS); | |
67 | ||
68 | printk("%s%s(0x%016lx to 0x%016lx)\n", lvl, str, bottom, top); | |
69 | ||
70 | for (first = bottom & ~31; first < top; first += 32) { | |
71 | unsigned long p; | |
72 | char str[sizeof(" 12345678") * 8 + 1]; | |
73 | ||
74 | memset(str, ' ', sizeof(str)); | |
75 | str[sizeof(str) - 1] = '\0'; | |
76 | ||
77 | for (p = first, i = 0; i < 8 && p < top; i++, p += 4) { | |
78 | if (p >= bottom && p < top) { | |
79 | unsigned int val; | |
80 | if (__get_user(val, (unsigned int *)p) == 0) | |
81 | sprintf(str + i * 9, " %08x", val); | |
82 | else | |
83 | sprintf(str + i * 9, " ????????"); | |
84 | } | |
85 | } | |
86 | printk("%s%04lx:%s\n", lvl, first & 0xffff, str); | |
87 | } | |
88 | ||
89 | set_fs(fs); | |
90 | } | |
91 | ||
92 | static void dump_backtrace_entry(unsigned long where, unsigned long stack) | |
93 | { | |
94 | print_ip_sym(where); | |
95 | if (in_exception_text(where)) | |
96 | dump_mem("", "Exception stack", stack, | |
97 | stack + sizeof(struct pt_regs)); | |
98 | } | |
99 | ||
100 | static void dump_instr(const char *lvl, struct pt_regs *regs) | |
101 | { | |
102 | unsigned long addr = instruction_pointer(regs); | |
103 | mm_segment_t fs; | |
104 | char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str; | |
105 | int i; | |
106 | ||
107 | /* | |
108 | * We need to switch to kernel mode so that we can use __get_user | |
109 | * to safely read from kernel space. Note that we now dump the | |
110 | * code first, just in case the backtrace kills us. | |
111 | */ | |
112 | fs = get_fs(); | |
113 | set_fs(KERNEL_DS); | |
114 | ||
115 | for (i = -4; i < 1; i++) { | |
116 | unsigned int val, bad; | |
117 | ||
118 | bad = __get_user(val, &((u32 *)addr)[i]); | |
119 | ||
120 | if (!bad) | |
121 | p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val); | |
122 | else { | |
123 | p += sprintf(p, "bad PC value"); | |
124 | break; | |
125 | } | |
126 | } | |
127 | printk("%sCode: %s\n", lvl, str); | |
128 | ||
129 | set_fs(fs); | |
130 | } | |
131 | ||
132 | static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) | |
133 | { | |
134 | struct stackframe frame; | |
60ffc30d CM |
135 | |
136 | pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk); | |
137 | ||
138 | if (!tsk) | |
139 | tsk = current; | |
140 | ||
141 | if (regs) { | |
142 | frame.fp = regs->regs[29]; | |
143 | frame.sp = regs->sp; | |
144 | frame.pc = regs->pc; | |
145 | } else if (tsk == current) { | |
146 | frame.fp = (unsigned long)__builtin_frame_address(0); | |
2128df14 | 147 | frame.sp = current_stack_pointer; |
60ffc30d CM |
148 | frame.pc = (unsigned long)dump_backtrace; |
149 | } else { | |
150 | /* | |
151 | * task blocked in __switch_to | |
152 | */ | |
153 | frame.fp = thread_saved_fp(tsk); | |
154 | frame.sp = thread_saved_sp(tsk); | |
155 | frame.pc = thread_saved_pc(tsk); | |
156 | } | |
157 | ||
ac7b406c | 158 | pr_emerg("Call trace:\n"); |
60ffc30d CM |
159 | while (1) { |
160 | unsigned long where = frame.pc; | |
161 | int ret; | |
162 | ||
163 | ret = unwind_frame(&frame); | |
164 | if (ret < 0) | |
165 | break; | |
166 | dump_backtrace_entry(where, frame.sp); | |
167 | } | |
168 | } | |
169 | ||
60ffc30d CM |
170 | void show_stack(struct task_struct *tsk, unsigned long *sp) |
171 | { | |
172 | dump_backtrace(NULL, tsk); | |
173 | barrier(); | |
174 | } | |
175 | ||
176 | #ifdef CONFIG_PREEMPT | |
177 | #define S_PREEMPT " PREEMPT" | |
178 | #else | |
179 | #define S_PREEMPT "" | |
180 | #endif | |
181 | #ifdef CONFIG_SMP | |
182 | #define S_SMP " SMP" | |
183 | #else | |
184 | #define S_SMP "" | |
185 | #endif | |
186 | ||
187 | static int __die(const char *str, int err, struct thread_info *thread, | |
188 | struct pt_regs *regs) | |
189 | { | |
190 | struct task_struct *tsk = thread->task; | |
191 | static int die_counter; | |
192 | int ret; | |
193 | ||
194 | pr_emerg("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n", | |
195 | str, err, ++die_counter); | |
196 | ||
197 | /* trap and error numbers are mostly meaningless on ARM */ | |
198 | ret = notify_die(DIE_OOPS, str, regs, err, 0, SIGSEGV); | |
199 | if (ret == NOTIFY_STOP) | |
200 | return ret; | |
201 | ||
202 | print_modules(); | |
203 | __show_regs(regs); | |
204 | pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n", | |
205 | TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1); | |
206 | ||
207 | if (!user_mode(regs) || in_interrupt()) { | |
208 | dump_mem(KERN_EMERG, "Stack: ", regs->sp, | |
209 | THREAD_SIZE + (unsigned long)task_stack_page(tsk)); | |
210 | dump_backtrace(regs, tsk); | |
211 | dump_instr(KERN_EMERG, regs); | |
212 | } | |
213 | ||
214 | return ret; | |
215 | } | |
216 | ||
217 | static DEFINE_RAW_SPINLOCK(die_lock); | |
218 | ||
219 | /* | |
220 | * This function is protected against re-entrancy. | |
221 | */ | |
222 | void die(const char *str, struct pt_regs *regs, int err) | |
223 | { | |
224 | struct thread_info *thread = current_thread_info(); | |
225 | int ret; | |
226 | ||
227 | oops_enter(); | |
228 | ||
229 | raw_spin_lock_irq(&die_lock); | |
230 | console_verbose(); | |
231 | bust_spinlocks(1); | |
232 | ret = __die(str, err, thread, regs); | |
233 | ||
234 | if (regs && kexec_should_crash(thread->task)) | |
235 | crash_kexec(regs); | |
236 | ||
237 | bust_spinlocks(0); | |
373d4d09 | 238 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
60ffc30d CM |
239 | raw_spin_unlock_irq(&die_lock); |
240 | oops_exit(); | |
241 | ||
242 | if (in_interrupt()) | |
243 | panic("Fatal exception in interrupt"); | |
244 | if (panic_on_oops) | |
245 | panic("Fatal exception"); | |
246 | if (ret != NOTIFY_STOP) | |
247 | do_exit(SIGSEGV); | |
248 | } | |
249 | ||
250 | void arm64_notify_die(const char *str, struct pt_regs *regs, | |
251 | struct siginfo *info, int err) | |
252 | { | |
9141300a CM |
253 | if (user_mode(regs)) { |
254 | current->thread.fault_address = 0; | |
255 | current->thread.fault_code = err; | |
60ffc30d | 256 | force_sig_info(info->si_signo, info, current); |
9141300a | 257 | } else { |
60ffc30d | 258 | die(str, regs, err); |
9141300a | 259 | } |
60ffc30d CM |
260 | } |
261 | ||
9b79f52d PA |
262 | static LIST_HEAD(undef_hook); |
263 | static DEFINE_RAW_SPINLOCK(undef_lock); | |
264 | ||
265 | void register_undef_hook(struct undef_hook *hook) | |
266 | { | |
267 | unsigned long flags; | |
268 | ||
269 | raw_spin_lock_irqsave(&undef_lock, flags); | |
270 | list_add(&hook->node, &undef_hook); | |
271 | raw_spin_unlock_irqrestore(&undef_lock, flags); | |
272 | } | |
273 | ||
274 | void unregister_undef_hook(struct undef_hook *hook) | |
275 | { | |
276 | unsigned long flags; | |
277 | ||
278 | raw_spin_lock_irqsave(&undef_lock, flags); | |
279 | list_del(&hook->node); | |
280 | raw_spin_unlock_irqrestore(&undef_lock, flags); | |
281 | } | |
282 | ||
283 | static int call_undef_hook(struct pt_regs *regs) | |
284 | { | |
285 | struct undef_hook *hook; | |
286 | unsigned long flags; | |
287 | u32 instr; | |
288 | int (*fn)(struct pt_regs *regs, u32 instr) = NULL; | |
289 | void __user *pc = (void __user *)instruction_pointer(regs); | |
290 | ||
291 | if (!user_mode(regs)) | |
292 | return 1; | |
293 | ||
294 | if (compat_thumb_mode(regs)) { | |
295 | /* 16-bit Thumb instruction */ | |
296 | if (get_user(instr, (u16 __user *)pc)) | |
297 | goto exit; | |
298 | instr = le16_to_cpu(instr); | |
299 | if (aarch32_insn_is_wide(instr)) { | |
300 | u32 instr2; | |
301 | ||
302 | if (get_user(instr2, (u16 __user *)(pc + 2))) | |
303 | goto exit; | |
304 | instr2 = le16_to_cpu(instr2); | |
305 | instr = (instr << 16) | instr2; | |
306 | } | |
307 | } else { | |
308 | /* 32-bit ARM instruction */ | |
309 | if (get_user(instr, (u32 __user *)pc)) | |
310 | goto exit; | |
311 | instr = le32_to_cpu(instr); | |
312 | } | |
313 | ||
314 | raw_spin_lock_irqsave(&undef_lock, flags); | |
315 | list_for_each_entry(hook, &undef_hook, node) | |
316 | if ((instr & hook->instr_mask) == hook->instr_val && | |
317 | (regs->pstate & hook->pstate_mask) == hook->pstate_val) | |
318 | fn = hook->fn; | |
319 | ||
320 | raw_spin_unlock_irqrestore(&undef_lock, flags); | |
321 | exit: | |
322 | return fn ? fn(regs, instr) : 1; | |
323 | } | |
324 | ||
60ffc30d CM |
325 | asmlinkage void __exception do_undefinstr(struct pt_regs *regs) |
326 | { | |
327 | siginfo_t info; | |
328 | void __user *pc = (void __user *)instruction_pointer(regs); | |
329 | ||
60ffc30d | 330 | /* check for AArch32 breakpoint instructions */ |
1442b6ed | 331 | if (!aarch32_break_handler(regs)) |
60ffc30d | 332 | return; |
60ffc30d | 333 | |
9b79f52d PA |
334 | if (call_undef_hook(regs) == 0) |
335 | return; | |
336 | ||
953dbbed CM |
337 | if (show_unhandled_signals && unhandled_signal(current, SIGILL) && |
338 | printk_ratelimit()) { | |
60ffc30d CM |
339 | pr_info("%s[%d]: undefined instruction: pc=%p\n", |
340 | current->comm, task_pid_nr(current), pc); | |
341 | dump_instr(KERN_INFO, regs); | |
342 | } | |
343 | ||
344 | info.si_signo = SIGILL; | |
345 | info.si_errno = 0; | |
346 | info.si_code = ILL_ILLOPC; | |
347 | info.si_addr = pc; | |
348 | ||
349 | arm64_notify_die("Oops - undefined instruction", regs, &info, 0); | |
350 | } | |
351 | ||
352 | long compat_arm_syscall(struct pt_regs *regs); | |
353 | ||
354 | asmlinkage long do_ni_syscall(struct pt_regs *regs) | |
355 | { | |
356 | #ifdef CONFIG_COMPAT | |
357 | long ret; | |
358 | if (is_compat_task()) { | |
359 | ret = compat_arm_syscall(regs); | |
360 | if (ret != -ENOSYS) | |
361 | return ret; | |
362 | } | |
363 | #endif | |
364 | ||
953dbbed | 365 | if (show_unhandled_signals && printk_ratelimit()) { |
60ffc30d CM |
366 | pr_info("%s[%d]: syscall %d\n", current->comm, |
367 | task_pid_nr(current), (int)regs->syscallno); | |
368 | dump_instr("", regs); | |
369 | if (user_mode(regs)) | |
370 | __show_regs(regs); | |
371 | } | |
372 | ||
373 | return sys_ni_syscall(); | |
374 | } | |
375 | ||
376 | /* | |
377 | * bad_mode handles the impossible case in the exception vector. | |
378 | */ | |
379 | asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr) | |
380 | { | |
9955ac47 MR |
381 | siginfo_t info; |
382 | void __user *pc = (void __user *)instruction_pointer(regs); | |
60ffc30d CM |
383 | console_verbose(); |
384 | ||
385 | pr_crit("Bad mode in %s handler detected, code 0x%08x\n", | |
386 | handler[reason], esr); | |
9955ac47 MR |
387 | __show_regs(regs); |
388 | ||
389 | info.si_signo = SIGILL; | |
390 | info.si_errno = 0; | |
391 | info.si_code = ILL_ILLOPC; | |
392 | info.si_addr = pc; | |
60ffc30d | 393 | |
9955ac47 | 394 | arm64_notify_die("Oops - bad mode", regs, &info, 0); |
60ffc30d CM |
395 | } |
396 | ||
397 | void __pte_error(const char *file, int line, unsigned long val) | |
398 | { | |
ac7b406c | 399 | pr_crit("%s:%d: bad pte %016lx.\n", file, line, val); |
60ffc30d CM |
400 | } |
401 | ||
402 | void __pmd_error(const char *file, int line, unsigned long val) | |
403 | { | |
ac7b406c | 404 | pr_crit("%s:%d: bad pmd %016lx.\n", file, line, val); |
60ffc30d CM |
405 | } |
406 | ||
c79b954b JL |
407 | void __pud_error(const char *file, int line, unsigned long val) |
408 | { | |
409 | pr_crit("%s:%d: bad pud %016lx.\n", file, line, val); | |
410 | } | |
411 | ||
60ffc30d CM |
412 | void __pgd_error(const char *file, int line, unsigned long val) |
413 | { | |
ac7b406c | 414 | pr_crit("%s:%d: bad pgd %016lx.\n", file, line, val); |
60ffc30d CM |
415 | } |
416 | ||
417 | void __init trap_init(void) | |
418 | { | |
419 | return; | |
420 | } |