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