Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/i386/traps.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * Pentium III FXSR, SSE support | |
7 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
8 | */ | |
9 | ||
10 | /* | |
11 | * 'Traps.c' handles hardware traps and faults after we have saved some | |
12 | * state in 'asm.s'. | |
13 | */ | |
1da177e4 LT |
14 | #include <linux/sched.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/kallsyms.h> | |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/kprobes.h> | |
6e274d14 | 29 | #include <linux/kexec.h> |
176a2718 | 30 | #include <linux/unwind.h> |
1e2af92e | 31 | #include <linux/uaccess.h> |
1da177e4 LT |
32 | |
33 | #ifdef CONFIG_EISA | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/eisa.h> | |
36 | #endif | |
37 | ||
38 | #ifdef CONFIG_MCA | |
39 | #include <linux/mca.h> | |
40 | #endif | |
41 | ||
42 | #include <asm/processor.h> | |
43 | #include <asm/system.h> | |
1da177e4 LT |
44 | #include <asm/io.h> |
45 | #include <asm/atomic.h> | |
46 | #include <asm/debugreg.h> | |
47 | #include <asm/desc.h> | |
48 | #include <asm/i387.h> | |
49 | #include <asm/nmi.h> | |
176a2718 | 50 | #include <asm/unwind.h> |
1da177e4 LT |
51 | #include <asm/smp.h> |
52 | #include <asm/arch_hooks.h> | |
53 | #include <asm/kdebug.h> | |
2b14a78c | 54 | #include <asm/stacktrace.h> |
1da177e4 | 55 | |
1da177e4 LT |
56 | #include <linux/module.h> |
57 | ||
58 | #include "mach_traps.h" | |
59 | ||
29cbc78b AK |
60 | int panic_on_unrecovered_nmi; |
61 | ||
1da177e4 LT |
62 | asmlinkage int system_call(void); |
63 | ||
1da177e4 LT |
64 | /* Do we ignore FPU interrupts ? */ |
65 | char ignore_fpu_irq = 0; | |
66 | ||
67 | /* | |
68 | * The IDT has to be page-aligned to simplify the Pentium | |
69 | * F0 0F bug workaround.. We have a special link segment | |
70 | * for this. | |
71 | */ | |
72 | struct desc_struct idt_table[256] __attribute__((__section__(".data.idt"))) = { {0, 0}, }; | |
73 | ||
74 | asmlinkage void divide_error(void); | |
75 | asmlinkage void debug(void); | |
76 | asmlinkage void nmi(void); | |
77 | asmlinkage void int3(void); | |
78 | asmlinkage void overflow(void); | |
79 | asmlinkage void bounds(void); | |
80 | asmlinkage void invalid_op(void); | |
81 | asmlinkage void device_not_available(void); | |
82 | asmlinkage void coprocessor_segment_overrun(void); | |
83 | asmlinkage void invalid_TSS(void); | |
84 | asmlinkage void segment_not_present(void); | |
85 | asmlinkage void stack_segment(void); | |
86 | asmlinkage void general_protection(void); | |
87 | asmlinkage void page_fault(void); | |
88 | asmlinkage void coprocessor_error(void); | |
89 | asmlinkage void simd_coprocessor_error(void); | |
90 | asmlinkage void alignment_check(void); | |
91 | asmlinkage void spurious_interrupt_bug(void); | |
92 | asmlinkage void machine_check(void); | |
93 | ||
94 | static int kstack_depth_to_print = 24; | |
ea424055 | 95 | #ifdef CONFIG_STACK_UNWIND |
c33bd9aa | 96 | static int call_trace = 1; |
ea424055 JB |
97 | #else |
98 | #define call_trace (-1) | |
99 | #endif | |
e041c683 | 100 | ATOMIC_NOTIFIER_HEAD(i386die_chain); |
1da177e4 LT |
101 | |
102 | int register_die_notifier(struct notifier_block *nb) | |
103 | { | |
101f12af | 104 | vmalloc_sync_all(); |
e041c683 | 105 | return atomic_notifier_chain_register(&i386die_chain, nb); |
1da177e4 | 106 | } |
1454aed9 | 107 | EXPORT_SYMBOL(register_die_notifier); /* used modular by kdb */ |
1da177e4 | 108 | |
e041c683 AS |
109 | int unregister_die_notifier(struct notifier_block *nb) |
110 | { | |
111 | return atomic_notifier_chain_unregister(&i386die_chain, nb); | |
112 | } | |
1454aed9 | 113 | EXPORT_SYMBOL(unregister_die_notifier); /* used modular by kdb */ |
e041c683 | 114 | |
1da177e4 LT |
115 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
116 | { | |
117 | return p > (void *)tinfo && | |
118 | p < (void *)tinfo + THREAD_SIZE - 3; | |
119 | } | |
120 | ||
121 | static inline unsigned long print_context_stack(struct thread_info *tinfo, | |
7aa89746 | 122 | unsigned long *stack, unsigned long ebp, |
2b14a78c | 123 | struct stacktrace_ops *ops, void *data) |
1da177e4 LT |
124 | { |
125 | unsigned long addr; | |
126 | ||
127 | #ifdef CONFIG_FRAME_POINTER | |
128 | while (valid_stack_ptr(tinfo, (void *)ebp)) { | |
808dbbb6 | 129 | unsigned long new_ebp; |
1da177e4 | 130 | addr = *(unsigned long *)(ebp + 4); |
2b14a78c | 131 | ops->address(data, addr); |
b88d4f1d IM |
132 | /* |
133 | * break out of recursive entries (such as | |
808dbbb6 LT |
134 | * end_of_stack_stop_unwind_function). Also, |
135 | * we can never allow a frame pointer to | |
136 | * move downwards! | |
b88d4f1d | 137 | */ |
808dbbb6 LT |
138 | new_ebp = *(unsigned long *)ebp; |
139 | if (new_ebp <= ebp) | |
b88d4f1d | 140 | break; |
808dbbb6 | 141 | ebp = new_ebp; |
1da177e4 LT |
142 | } |
143 | #else | |
144 | while (valid_stack_ptr(tinfo, stack)) { | |
145 | addr = *stack++; | |
7aa89746 | 146 | if (__kernel_text_address(addr)) |
2b14a78c | 147 | ops->address(data, addr); |
1da177e4 LT |
148 | } |
149 | #endif | |
150 | return ebp; | |
151 | } | |
152 | ||
2b14a78c AK |
153 | struct ops_and_data { |
154 | struct stacktrace_ops *ops; | |
155 | void *data; | |
156 | }; | |
157 | ||
f0a5c315 | 158 | static asmlinkage int |
2b14a78c | 159 | dump_trace_unwind(struct unwind_frame_info *info, void *data) |
176a2718 | 160 | { |
2b14a78c | 161 | struct ops_and_data *oad = (struct ops_and_data *)data; |
c33bd9aa | 162 | int n = 0; |
176a2718 JB |
163 | |
164 | while (unwind(info) == 0 && UNW_PC(info)) { | |
f0a5c315 | 165 | n++; |
2b14a78c | 166 | oad->ops->address(oad->data, UNW_PC(info)); |
176a2718 JB |
167 | if (arch_unw_user_mode(info)) |
168 | break; | |
169 | } | |
c33bd9aa | 170 | return n; |
176a2718 JB |
171 | } |
172 | ||
b615ebda AK |
173 | #define MSG(msg) ops->warning(data, msg) |
174 | ||
2b14a78c AK |
175 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
176 | unsigned long *stack, | |
177 | struct stacktrace_ops *ops, void *data) | |
1da177e4 | 178 | { |
a32cf397 | 179 | unsigned long ebp = 0; |
1da177e4 LT |
180 | |
181 | if (!task) | |
182 | task = current; | |
183 | ||
c33bd9aa JB |
184 | if (call_trace >= 0) { |
185 | int unw_ret = 0; | |
186 | struct unwind_frame_info info; | |
2b14a78c | 187 | struct ops_and_data oad = { .ops = ops, .data = data }; |
c33bd9aa JB |
188 | |
189 | if (regs) { | |
190 | if (unwind_init_frame_info(&info, task, regs) == 0) | |
2b14a78c | 191 | unw_ret = dump_trace_unwind(&info, &oad); |
c33bd9aa | 192 | } else if (task == current) |
b615ebda AK |
193 | unw_ret = unwind_init_running(&info, dump_trace_unwind, |
194 | &oad); | |
c33bd9aa JB |
195 | else { |
196 | if (unwind_init_blocked(&info, task) == 0) | |
2b14a78c | 197 | unw_ret = dump_trace_unwind(&info, &oad); |
176a2718 | 198 | } |
ea424055 JB |
199 | if (unw_ret > 0) { |
200 | if (call_trace == 1 && !arch_unw_user_mode(&info)) { | |
b615ebda | 201 | ops->warning_symbol(data, |
dd315df1 | 202 | "DWARF2 unwinder stuck at %s", |
ea424055 JB |
203 | UNW_PC(&info)); |
204 | if (UNW_SP(&info) >= PAGE_OFFSET) { | |
dd315df1 | 205 | MSG("Leftover inexact backtrace:"); |
70583161 | 206 | stack = (void *)UNW_SP(&info); |
950fee84 AK |
207 | if (!stack) |
208 | return; | |
a32cf397 | 209 | ebp = UNW_FP(&info); |
ea424055 | 210 | } else |
dd315df1 | 211 | MSG("Full inexact backtrace again:"); |
ea424055 | 212 | } else if (call_trace >= 1) |
c33bd9aa | 213 | return; |
c97d20a6 | 214 | else |
dd315df1 | 215 | MSG("Full inexact backtrace again:"); |
ea424055 | 216 | } else |
dd315df1 | 217 | MSG("Inexact backtrace:"); |
a32cf397 AK |
218 | } |
219 | if (!stack) { | |
2b14a78c AK |
220 | unsigned long dummy; |
221 | stack = &dummy; | |
222 | if (task && task != current) | |
223 | stack = (unsigned long *)task->thread.esp; | |
176a2718 JB |
224 | } |
225 | ||
a32cf397 AK |
226 | #ifdef CONFIG_FRAME_POINTER |
227 | if (!ebp) { | |
228 | if (task == current) { | |
229 | /* Grab ebp right from our regs */ | |
230 | asm ("movl %%ebp, %0" : "=r" (ebp) : ); | |
231 | } else { | |
232 | /* ebp is the last reg pushed by switch_to */ | |
233 | ebp = *(unsigned long *) task->thread.esp; | |
234 | } | |
1da177e4 | 235 | } |
a32cf397 | 236 | #endif |
1da177e4 LT |
237 | |
238 | while (1) { | |
239 | struct thread_info *context; | |
240 | context = (struct thread_info *) | |
241 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
2b14a78c AK |
242 | ebp = print_context_stack(context, stack, ebp, ops, data); |
243 | /* Should be after the line below, but somewhere | |
244 | in early boot context comes out corrupted and we | |
245 | can't reference it -AK */ | |
246 | if (ops->stack(data, "IRQ") < 0) | |
247 | break; | |
1da177e4 LT |
248 | stack = (unsigned long*)context->previous_esp; |
249 | if (!stack) | |
250 | break; | |
1da177e4 LT |
251 | } |
252 | } | |
2b14a78c AK |
253 | EXPORT_SYMBOL(dump_trace); |
254 | ||
255 | static void | |
256 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
257 | { | |
258 | printk(data); | |
259 | print_symbol(msg, symbol); | |
260 | printk("\n"); | |
261 | } | |
262 | ||
263 | static void print_trace_warning(void *data, char *msg) | |
264 | { | |
265 | printk("%s%s\n", (char *)data, msg); | |
266 | } | |
267 | ||
268 | static int print_trace_stack(void *data, char *name) | |
269 | { | |
270 | return 0; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Print one address/symbol entries per line. | |
275 | */ | |
276 | static void print_trace_address(void *data, unsigned long addr) | |
277 | { | |
278 | printk("%s [<%08lx>] ", (char *)data, addr); | |
279 | print_symbol("%s\n", addr); | |
280 | } | |
281 | ||
282 | static struct stacktrace_ops print_trace_ops = { | |
283 | .warning = print_trace_warning, | |
284 | .warning_symbol = print_trace_warning_symbol, | |
285 | .stack = print_trace_stack, | |
286 | .address = print_trace_address, | |
287 | }; | |
288 | ||
289 | static void | |
290 | show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
291 | unsigned long * stack, char *log_lvl) | |
292 | { | |
293 | dump_trace(task, regs, stack, &print_trace_ops, log_lvl); | |
294 | printk("%s =======================\n", log_lvl); | |
295 | } | |
1da177e4 | 296 | |
2b14a78c AK |
297 | void show_trace(struct task_struct *task, struct pt_regs *regs, |
298 | unsigned long * stack) | |
7aa89746 | 299 | { |
176a2718 | 300 | show_trace_log_lvl(task, regs, stack, ""); |
7aa89746 CE |
301 | } |
302 | ||
176a2718 JB |
303 | static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
304 | unsigned long *esp, char *log_lvl) | |
1da177e4 LT |
305 | { |
306 | unsigned long *stack; | |
307 | int i; | |
308 | ||
309 | if (esp == NULL) { | |
310 | if (task) | |
311 | esp = (unsigned long*)task->thread.esp; | |
312 | else | |
313 | esp = (unsigned long *)&esp; | |
314 | } | |
315 | ||
316 | stack = esp; | |
317 | for(i = 0; i < kstack_depth_to_print; i++) { | |
318 | if (kstack_end(stack)) | |
319 | break; | |
75874d5c CE |
320 | if (i && ((i % 8) == 0)) |
321 | printk("\n%s ", log_lvl); | |
1da177e4 LT |
322 | printk("%08lx ", *stack++); |
323 | } | |
75874d5c | 324 | printk("\n%sCall Trace:\n", log_lvl); |
176a2718 | 325 | show_trace_log_lvl(task, regs, esp, log_lvl); |
7aa89746 CE |
326 | } |
327 | ||
328 | void show_stack(struct task_struct *task, unsigned long *esp) | |
329 | { | |
75874d5c | 330 | printk(" "); |
176a2718 | 331 | show_stack_log_lvl(task, NULL, esp, ""); |
1da177e4 LT |
332 | } |
333 | ||
334 | /* | |
335 | * The architecture-independent dump_stack generator | |
336 | */ | |
337 | void dump_stack(void) | |
338 | { | |
339 | unsigned long stack; | |
340 | ||
176a2718 | 341 | show_trace(current, NULL, &stack); |
1da177e4 LT |
342 | } |
343 | ||
344 | EXPORT_SYMBOL(dump_stack); | |
345 | ||
346 | void show_registers(struct pt_regs *regs) | |
347 | { | |
348 | int i; | |
349 | int in_kernel = 1; | |
350 | unsigned long esp; | |
351 | unsigned short ss; | |
352 | ||
353 | esp = (unsigned long) (®s->esp); | |
0998e422 | 354 | savesegment(ss, ss); |
db753bdf | 355 | if (user_mode_vm(regs)) { |
1da177e4 LT |
356 | in_kernel = 0; |
357 | esp = regs->esp; | |
358 | ss = regs->xss & 0xffff; | |
359 | } | |
360 | print_modules(); | |
f354b3a9 DJ |
361 | printk(KERN_EMERG "CPU: %d\n" |
362 | KERN_EMERG "EIP: %04x:[<%08lx>] %s VLI\n" | |
363 | KERN_EMERG "EFLAGS: %08lx (%s %.*s)\n", | |
1da177e4 | 364 | smp_processor_id(), 0xffff & regs->xcs, regs->eip, |
96b644bd SH |
365 | print_tainted(), regs->eflags, init_utsname()->release, |
366 | (int)strcspn(init_utsname()->version, " "), | |
367 | init_utsname()->version); | |
9c107805 DJ |
368 | print_symbol(KERN_EMERG "EIP is at %s\n", regs->eip); |
369 | printk(KERN_EMERG "eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n", | |
1da177e4 | 370 | regs->eax, regs->ebx, regs->ecx, regs->edx); |
9c107805 | 371 | printk(KERN_EMERG "esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n", |
1da177e4 | 372 | regs->esi, regs->edi, regs->ebp, esp); |
9c107805 | 373 | printk(KERN_EMERG "ds: %04x es: %04x ss: %04x\n", |
1da177e4 | 374 | regs->xds & 0xffff, regs->xes & 0xffff, ss); |
7e04a118 CE |
375 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)", |
376 | TASK_COMM_LEN, current->comm, current->pid, | |
377 | current_thread_info(), current, current->thread_info); | |
1da177e4 LT |
378 | /* |
379 | * When in-kernel, we also print out the stack and code at the | |
380 | * time of the fault.. | |
381 | */ | |
382 | if (in_kernel) { | |
3f3ae347 | 383 | u8 __user *eip; |
99325326 CE |
384 | int code_bytes = 64; |
385 | unsigned char c; | |
1da177e4 | 386 | |
9c107805 | 387 | printk("\n" KERN_EMERG "Stack: "); |
176a2718 | 388 | show_stack_log_lvl(NULL, regs, (unsigned long *)esp, KERN_EMERG); |
1da177e4 | 389 | |
9c107805 | 390 | printk(KERN_EMERG "Code: "); |
1da177e4 | 391 | |
3f3ae347 | 392 | eip = (u8 __user *)regs->eip - 43; |
99325326 CE |
393 | if (eip < (u8 __user *)PAGE_OFFSET || __get_user(c, eip)) { |
394 | /* try starting at EIP */ | |
395 | eip = (u8 __user *)regs->eip; | |
396 | code_bytes = 32; | |
397 | } | |
398 | for (i = 0; i < code_bytes; i++, eip++) { | |
3f3ae347 | 399 | if (eip < (u8 __user *)PAGE_OFFSET || __get_user(c, eip)) { |
1da177e4 LT |
400 | printk(" Bad EIP value."); |
401 | break; | |
402 | } | |
3f3ae347 | 403 | if (eip == (u8 __user *)regs->eip) |
1da177e4 LT |
404 | printk("<%02x> ", c); |
405 | else | |
406 | printk("%02x ", c); | |
407 | } | |
408 | } | |
409 | printk("\n"); | |
410 | } | |
411 | ||
412 | static void handle_BUG(struct pt_regs *regs) | |
413 | { | |
b7015331 | 414 | unsigned long eip = regs->eip; |
1da177e4 | 415 | unsigned short ud2; |
1da177e4 LT |
416 | |
417 | if (eip < PAGE_OFFSET) | |
b7015331 | 418 | return; |
1e2af92e | 419 | if (probe_kernel_address((unsigned short __user *)eip, ud2)) |
b7015331 | 420 | return; |
1da177e4 | 421 | if (ud2 != 0x0b0f) |
b7015331 | 422 | return; |
1da177e4 | 423 | |
9c107805 | 424 | printk(KERN_EMERG "------------[ cut here ]------------\n"); |
1da177e4 | 425 | |
b7015331 CE |
426 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
427 | do { | |
428 | unsigned short line; | |
429 | char *file; | |
430 | char c; | |
431 | ||
1e2af92e AM |
432 | if (probe_kernel_address((unsigned short __user *)(eip + 2), |
433 | line)) | |
b7015331 CE |
434 | break; |
435 | if (__get_user(file, (char * __user *)(eip + 4)) || | |
436 | (unsigned long)file < PAGE_OFFSET || __get_user(c, file)) | |
437 | file = "<bad filename>"; | |
1da177e4 | 438 | |
b7015331 CE |
439 | printk(KERN_EMERG "kernel BUG at %s:%d!\n", file, line); |
440 | return; | |
441 | } while (0); | |
442 | #endif | |
443 | printk(KERN_EMERG "Kernel BUG at [verbose debug info unavailable]\n"); | |
1da177e4 LT |
444 | } |
445 | ||
6e274d14 AN |
446 | /* This is gone through when something in the kernel |
447 | * has done something bad and is about to be terminated. | |
448 | */ | |
1da177e4 LT |
449 | void die(const char * str, struct pt_regs * regs, long err) |
450 | { | |
451 | static struct { | |
452 | spinlock_t lock; | |
453 | u32 lock_owner; | |
454 | int lock_owner_depth; | |
455 | } die = { | |
456 | .lock = SPIN_LOCK_UNLOCKED, | |
457 | .lock_owner = -1, | |
458 | .lock_owner_depth = 0 | |
459 | }; | |
460 | static int die_counter; | |
e43d674f | 461 | unsigned long flags; |
1da177e4 | 462 | |
dd287796 AM |
463 | oops_enter(); |
464 | ||
39c715b7 | 465 | if (die.lock_owner != raw_smp_processor_id()) { |
1da177e4 | 466 | console_verbose(); |
e43d674f | 467 | spin_lock_irqsave(&die.lock, flags); |
1da177e4 LT |
468 | die.lock_owner = smp_processor_id(); |
469 | die.lock_owner_depth = 0; | |
470 | bust_spinlocks(1); | |
471 | } | |
e43d674f JB |
472 | else |
473 | local_save_flags(flags); | |
1da177e4 LT |
474 | |
475 | if (++die.lock_owner_depth < 3) { | |
476 | int nl = 0; | |
7bee5c0f RD |
477 | unsigned long esp; |
478 | unsigned short ss; | |
479 | ||
1da177e4 | 480 | handle_BUG(regs); |
9c107805 | 481 | printk(KERN_EMERG "%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); |
1da177e4 | 482 | #ifdef CONFIG_PREEMPT |
9c107805 | 483 | printk(KERN_EMERG "PREEMPT "); |
1da177e4 LT |
484 | nl = 1; |
485 | #endif | |
486 | #ifdef CONFIG_SMP | |
9c107805 DJ |
487 | if (!nl) |
488 | printk(KERN_EMERG); | |
1da177e4 LT |
489 | printk("SMP "); |
490 | nl = 1; | |
491 | #endif | |
492 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
9c107805 DJ |
493 | if (!nl) |
494 | printk(KERN_EMERG); | |
1da177e4 LT |
495 | printk("DEBUG_PAGEALLOC"); |
496 | nl = 1; | |
497 | #endif | |
498 | if (nl) | |
499 | printk("\n"); | |
20c0d2d4 JB |
500 | if (notify_die(DIE_OOPS, str, regs, err, |
501 | current->thread.trap_no, SIGSEGV) != | |
7bee5c0f | 502 | NOTIFY_STOP) { |
20c0d2d4 | 503 | show_registers(regs); |
7bee5c0f RD |
504 | /* Executive summary in case the oops scrolled away */ |
505 | esp = (unsigned long) (®s->esp); | |
506 | savesegment(ss, ss); | |
507 | if (user_mode(regs)) { | |
508 | esp = regs->esp; | |
509 | ss = regs->xss & 0xffff; | |
510 | } | |
511 | printk(KERN_EMERG "EIP: [<%08lx>] ", regs->eip); | |
512 | print_symbol("%s", regs->eip); | |
513 | printk(" SS:ESP %04x:%08lx\n", ss, esp); | |
514 | } | |
20c0d2d4 JB |
515 | else |
516 | regs = NULL; | |
1da177e4 | 517 | } else |
9c107805 | 518 | printk(KERN_EMERG "Recursive die() failure, output suppressed\n"); |
1da177e4 LT |
519 | |
520 | bust_spinlocks(0); | |
521 | die.lock_owner = -1; | |
e43d674f | 522 | spin_unlock_irqrestore(&die.lock, flags); |
6e274d14 | 523 | |
20c0d2d4 JB |
524 | if (!regs) |
525 | return; | |
526 | ||
6e274d14 AN |
527 | if (kexec_should_crash(current)) |
528 | crash_kexec(regs); | |
529 | ||
1da177e4 LT |
530 | if (in_interrupt()) |
531 | panic("Fatal exception in interrupt"); | |
532 | ||
cea6a4ba | 533 | if (panic_on_oops) |
012c437d | 534 | panic("Fatal exception"); |
cea6a4ba | 535 | |
dd287796 | 536 | oops_exit(); |
1da177e4 LT |
537 | do_exit(SIGSEGV); |
538 | } | |
539 | ||
540 | static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err) | |
541 | { | |
717b594a | 542 | if (!user_mode_vm(regs)) |
1da177e4 LT |
543 | die(str, regs, err); |
544 | } | |
545 | ||
3d97ae5b PP |
546 | static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86, |
547 | struct pt_regs * regs, long error_code, | |
548 | siginfo_t *info) | |
1da177e4 | 549 | { |
4f339ecb AN |
550 | struct task_struct *tsk = current; |
551 | tsk->thread.error_code = error_code; | |
552 | tsk->thread.trap_no = trapnr; | |
553 | ||
1da177e4 LT |
554 | if (regs->eflags & VM_MASK) { |
555 | if (vm86) | |
556 | goto vm86_trap; | |
557 | goto trap_signal; | |
558 | } | |
559 | ||
717b594a | 560 | if (!user_mode(regs)) |
1da177e4 LT |
561 | goto kernel_trap; |
562 | ||
563 | trap_signal: { | |
1da177e4 LT |
564 | if (info) |
565 | force_sig_info(signr, info, tsk); | |
566 | else | |
567 | force_sig(signr, tsk); | |
568 | return; | |
569 | } | |
570 | ||
571 | kernel_trap: { | |
572 | if (!fixup_exception(regs)) | |
573 | die(str, regs, error_code); | |
574 | return; | |
575 | } | |
576 | ||
577 | vm86_trap: { | |
578 | int ret = handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, trapnr); | |
579 | if (ret) goto trap_signal; | |
580 | return; | |
581 | } | |
582 | } | |
583 | ||
584 | #define DO_ERROR(trapnr, signr, str, name) \ | |
585 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
586 | { \ | |
587 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
588 | == NOTIFY_STOP) \ | |
589 | return; \ | |
590 | do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \ | |
591 | } | |
592 | ||
593 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
594 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
595 | { \ | |
596 | siginfo_t info; \ | |
597 | info.si_signo = signr; \ | |
598 | info.si_errno = 0; \ | |
599 | info.si_code = sicode; \ | |
600 | info.si_addr = (void __user *)siaddr; \ | |
601 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
602 | == NOTIFY_STOP) \ | |
603 | return; \ | |
604 | do_trap(trapnr, signr, str, 0, regs, error_code, &info); \ | |
605 | } | |
606 | ||
607 | #define DO_VM86_ERROR(trapnr, signr, str, name) \ | |
608 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
609 | { \ | |
610 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
611 | == NOTIFY_STOP) \ | |
612 | return; \ | |
613 | do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \ | |
614 | } | |
615 | ||
616 | #define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
617 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
618 | { \ | |
619 | siginfo_t info; \ | |
620 | info.si_signo = signr; \ | |
621 | info.si_errno = 0; \ | |
622 | info.si_code = sicode; \ | |
623 | info.si_addr = (void __user *)siaddr; \ | |
624 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
625 | == NOTIFY_STOP) \ | |
626 | return; \ | |
627 | do_trap(trapnr, signr, str, 1, regs, error_code, &info); \ | |
628 | } | |
629 | ||
630 | DO_VM86_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->eip) | |
631 | #ifndef CONFIG_KPROBES | |
632 | DO_VM86_ERROR( 3, SIGTRAP, "int3", int3) | |
633 | #endif | |
634 | DO_VM86_ERROR( 4, SIGSEGV, "overflow", overflow) | |
635 | DO_VM86_ERROR( 5, SIGSEGV, "bounds", bounds) | |
631b0347 | 636 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->eip) |
1da177e4 LT |
637 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
638 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
639 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
640 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) | |
641 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
a879cbbb | 642 | DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0) |
1da177e4 | 643 | |
3d97ae5b PP |
644 | fastcall void __kprobes do_general_protection(struct pt_regs * regs, |
645 | long error_code) | |
1da177e4 LT |
646 | { |
647 | int cpu = get_cpu(); | |
648 | struct tss_struct *tss = &per_cpu(init_tss, cpu); | |
649 | struct thread_struct *thread = ¤t->thread; | |
650 | ||
651 | /* | |
652 | * Perform the lazy TSS's I/O bitmap copy. If the TSS has an | |
653 | * invalid offset set (the LAZY one) and the faulting thread has | |
654 | * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS | |
655 | * and we set the offset field correctly. Then we let the CPU to | |
656 | * restart the faulting instruction. | |
657 | */ | |
658 | if (tss->io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY && | |
659 | thread->io_bitmap_ptr) { | |
660 | memcpy(tss->io_bitmap, thread->io_bitmap_ptr, | |
661 | thread->io_bitmap_max); | |
662 | /* | |
663 | * If the previously set map was extending to higher ports | |
664 | * than the current one, pad extra space with 0xff (no access). | |
665 | */ | |
666 | if (thread->io_bitmap_max < tss->io_bitmap_max) | |
667 | memset((char *) tss->io_bitmap + | |
668 | thread->io_bitmap_max, 0xff, | |
669 | tss->io_bitmap_max - thread->io_bitmap_max); | |
670 | tss->io_bitmap_max = thread->io_bitmap_max; | |
671 | tss->io_bitmap_base = IO_BITMAP_OFFSET; | |
d5cd4aad | 672 | tss->io_bitmap_owner = thread; |
1da177e4 LT |
673 | put_cpu(); |
674 | return; | |
675 | } | |
676 | put_cpu(); | |
677 | ||
4f339ecb AN |
678 | current->thread.error_code = error_code; |
679 | current->thread.trap_no = 13; | |
680 | ||
1da177e4 LT |
681 | if (regs->eflags & VM_MASK) |
682 | goto gp_in_vm86; | |
683 | ||
717b594a | 684 | if (!user_mode(regs)) |
1da177e4 LT |
685 | goto gp_in_kernel; |
686 | ||
687 | current->thread.error_code = error_code; | |
688 | current->thread.trap_no = 13; | |
689 | force_sig(SIGSEGV, current); | |
690 | return; | |
691 | ||
692 | gp_in_vm86: | |
693 | local_irq_enable(); | |
694 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); | |
695 | return; | |
696 | ||
697 | gp_in_kernel: | |
698 | if (!fixup_exception(regs)) { | |
699 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
700 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
701 | return; | |
702 | die("general protection fault", regs, error_code); | |
703 | } | |
704 | } | |
705 | ||