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> |
a36df98a | 32 | #include <linux/nmi.h> |
91768d6c | 33 | #include <linux/bug.h> |
1da177e4 LT |
34 | |
35 | #ifdef CONFIG_EISA | |
36 | #include <linux/ioport.h> | |
37 | #include <linux/eisa.h> | |
38 | #endif | |
39 | ||
40 | #ifdef CONFIG_MCA | |
41 | #include <linux/mca.h> | |
42 | #endif | |
43 | ||
44 | #include <asm/processor.h> | |
45 | #include <asm/system.h> | |
1da177e4 LT |
46 | #include <asm/io.h> |
47 | #include <asm/atomic.h> | |
48 | #include <asm/debugreg.h> | |
49 | #include <asm/desc.h> | |
50 | #include <asm/i387.h> | |
51 | #include <asm/nmi.h> | |
176a2718 | 52 | #include <asm/unwind.h> |
1da177e4 LT |
53 | #include <asm/smp.h> |
54 | #include <asm/arch_hooks.h> | |
55 | #include <asm/kdebug.h> | |
2b14a78c | 56 | #include <asm/stacktrace.h> |
1da177e4 | 57 | |
1da177e4 LT |
58 | #include <linux/module.h> |
59 | ||
60 | #include "mach_traps.h" | |
61 | ||
29cbc78b AK |
62 | int panic_on_unrecovered_nmi; |
63 | ||
1da177e4 LT |
64 | asmlinkage int system_call(void); |
65 | ||
1da177e4 LT |
66 | /* Do we ignore FPU interrupts ? */ |
67 | char ignore_fpu_irq = 0; | |
68 | ||
69 | /* | |
70 | * The IDT has to be page-aligned to simplify the Pentium | |
71 | * F0 0F bug workaround.. We have a special link segment | |
72 | * for this. | |
73 | */ | |
74 | struct desc_struct idt_table[256] __attribute__((__section__(".data.idt"))) = { {0, 0}, }; | |
75 | ||
76 | asmlinkage void divide_error(void); | |
77 | asmlinkage void debug(void); | |
78 | asmlinkage void nmi(void); | |
79 | asmlinkage void int3(void); | |
80 | asmlinkage void overflow(void); | |
81 | asmlinkage void bounds(void); | |
82 | asmlinkage void invalid_op(void); | |
83 | asmlinkage void device_not_available(void); | |
84 | asmlinkage void coprocessor_segment_overrun(void); | |
85 | asmlinkage void invalid_TSS(void); | |
86 | asmlinkage void segment_not_present(void); | |
87 | asmlinkage void stack_segment(void); | |
88 | asmlinkage void general_protection(void); | |
89 | asmlinkage void page_fault(void); | |
90 | asmlinkage void coprocessor_error(void); | |
91 | asmlinkage void simd_coprocessor_error(void); | |
92 | asmlinkage void alignment_check(void); | |
93 | asmlinkage void spurious_interrupt_bug(void); | |
94 | asmlinkage void machine_check(void); | |
95 | ||
0741f4d2 | 96 | int kstack_depth_to_print = 24; |
e041c683 | 97 | ATOMIC_NOTIFIER_HEAD(i386die_chain); |
1da177e4 LT |
98 | |
99 | int register_die_notifier(struct notifier_block *nb) | |
100 | { | |
101f12af | 101 | vmalloc_sync_all(); |
e041c683 | 102 | return atomic_notifier_chain_register(&i386die_chain, nb); |
1da177e4 | 103 | } |
1454aed9 | 104 | EXPORT_SYMBOL(register_die_notifier); /* used modular by kdb */ |
1da177e4 | 105 | |
e041c683 AS |
106 | int unregister_die_notifier(struct notifier_block *nb) |
107 | { | |
108 | return atomic_notifier_chain_unregister(&i386die_chain, nb); | |
109 | } | |
1454aed9 | 110 | EXPORT_SYMBOL(unregister_die_notifier); /* used modular by kdb */ |
e041c683 | 111 | |
1da177e4 LT |
112 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
113 | { | |
114 | return p > (void *)tinfo && | |
115 | p < (void *)tinfo + THREAD_SIZE - 3; | |
116 | } | |
117 | ||
118 | static inline unsigned long print_context_stack(struct thread_info *tinfo, | |
7aa89746 | 119 | unsigned long *stack, unsigned long ebp, |
2b14a78c | 120 | struct stacktrace_ops *ops, void *data) |
1da177e4 LT |
121 | { |
122 | unsigned long addr; | |
123 | ||
124 | #ifdef CONFIG_FRAME_POINTER | |
125 | while (valid_stack_ptr(tinfo, (void *)ebp)) { | |
808dbbb6 | 126 | unsigned long new_ebp; |
1da177e4 | 127 | addr = *(unsigned long *)(ebp + 4); |
2b14a78c | 128 | ops->address(data, addr); |
b88d4f1d IM |
129 | /* |
130 | * break out of recursive entries (such as | |
808dbbb6 LT |
131 | * end_of_stack_stop_unwind_function). Also, |
132 | * we can never allow a frame pointer to | |
133 | * move downwards! | |
b88d4f1d | 134 | */ |
808dbbb6 LT |
135 | new_ebp = *(unsigned long *)ebp; |
136 | if (new_ebp <= ebp) | |
b88d4f1d | 137 | break; |
808dbbb6 | 138 | ebp = new_ebp; |
1da177e4 LT |
139 | } |
140 | #else | |
141 | while (valid_stack_ptr(tinfo, stack)) { | |
142 | addr = *stack++; | |
7aa89746 | 143 | if (__kernel_text_address(addr)) |
2b14a78c | 144 | ops->address(data, addr); |
1da177e4 LT |
145 | } |
146 | #endif | |
147 | return ebp; | |
148 | } | |
149 | ||
b615ebda AK |
150 | #define MSG(msg) ops->warning(data, msg) |
151 | ||
2b14a78c AK |
152 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
153 | unsigned long *stack, | |
154 | struct stacktrace_ops *ops, void *data) | |
1da177e4 | 155 | { |
a32cf397 | 156 | unsigned long ebp = 0; |
1da177e4 LT |
157 | |
158 | if (!task) | |
159 | task = current; | |
160 | ||
a32cf397 | 161 | if (!stack) { |
2b14a78c AK |
162 | unsigned long dummy; |
163 | stack = &dummy; | |
164 | if (task && task != current) | |
165 | stack = (unsigned long *)task->thread.esp; | |
176a2718 JB |
166 | } |
167 | ||
a32cf397 AK |
168 | #ifdef CONFIG_FRAME_POINTER |
169 | if (!ebp) { | |
170 | if (task == current) { | |
171 | /* Grab ebp right from our regs */ | |
172 | asm ("movl %%ebp, %0" : "=r" (ebp) : ); | |
173 | } else { | |
174 | /* ebp is the last reg pushed by switch_to */ | |
175 | ebp = *(unsigned long *) task->thread.esp; | |
176 | } | |
1da177e4 | 177 | } |
a32cf397 | 178 | #endif |
1da177e4 LT |
179 | |
180 | while (1) { | |
181 | struct thread_info *context; | |
182 | context = (struct thread_info *) | |
183 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
2b14a78c AK |
184 | ebp = print_context_stack(context, stack, ebp, ops, data); |
185 | /* Should be after the line below, but somewhere | |
186 | in early boot context comes out corrupted and we | |
187 | can't reference it -AK */ | |
188 | if (ops->stack(data, "IRQ") < 0) | |
189 | break; | |
1da177e4 LT |
190 | stack = (unsigned long*)context->previous_esp; |
191 | if (!stack) | |
192 | break; | |
a36df98a | 193 | touch_nmi_watchdog(); |
1da177e4 LT |
194 | } |
195 | } | |
2b14a78c AK |
196 | EXPORT_SYMBOL(dump_trace); |
197 | ||
198 | static void | |
199 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
200 | { | |
201 | printk(data); | |
202 | print_symbol(msg, symbol); | |
203 | printk("\n"); | |
204 | } | |
205 | ||
206 | static void print_trace_warning(void *data, char *msg) | |
207 | { | |
208 | printk("%s%s\n", (char *)data, msg); | |
209 | } | |
210 | ||
211 | static int print_trace_stack(void *data, char *name) | |
212 | { | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Print one address/symbol entries per line. | |
218 | */ | |
219 | static void print_trace_address(void *data, unsigned long addr) | |
220 | { | |
221 | printk("%s [<%08lx>] ", (char *)data, addr); | |
222 | print_symbol("%s\n", addr); | |
223 | } | |
224 | ||
225 | static struct stacktrace_ops print_trace_ops = { | |
226 | .warning = print_trace_warning, | |
227 | .warning_symbol = print_trace_warning_symbol, | |
228 | .stack = print_trace_stack, | |
229 | .address = print_trace_address, | |
230 | }; | |
231 | ||
232 | static void | |
233 | show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
234 | unsigned long * stack, char *log_lvl) | |
235 | { | |
236 | dump_trace(task, regs, stack, &print_trace_ops, log_lvl); | |
237 | printk("%s =======================\n", log_lvl); | |
238 | } | |
1da177e4 | 239 | |
2b14a78c AK |
240 | void show_trace(struct task_struct *task, struct pt_regs *regs, |
241 | unsigned long * stack) | |
7aa89746 | 242 | { |
176a2718 | 243 | show_trace_log_lvl(task, regs, stack, ""); |
7aa89746 CE |
244 | } |
245 | ||
176a2718 JB |
246 | static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
247 | unsigned long *esp, char *log_lvl) | |
1da177e4 LT |
248 | { |
249 | unsigned long *stack; | |
250 | int i; | |
251 | ||
252 | if (esp == NULL) { | |
253 | if (task) | |
254 | esp = (unsigned long*)task->thread.esp; | |
255 | else | |
256 | esp = (unsigned long *)&esp; | |
257 | } | |
258 | ||
259 | stack = esp; | |
260 | for(i = 0; i < kstack_depth_to_print; i++) { | |
261 | if (kstack_end(stack)) | |
262 | break; | |
75874d5c CE |
263 | if (i && ((i % 8) == 0)) |
264 | printk("\n%s ", log_lvl); | |
1da177e4 LT |
265 | printk("%08lx ", *stack++); |
266 | } | |
75874d5c | 267 | printk("\n%sCall Trace:\n", log_lvl); |
176a2718 | 268 | show_trace_log_lvl(task, regs, esp, log_lvl); |
7aa89746 CE |
269 | } |
270 | ||
271 | void show_stack(struct task_struct *task, unsigned long *esp) | |
272 | { | |
75874d5c | 273 | printk(" "); |
176a2718 | 274 | show_stack_log_lvl(task, NULL, esp, ""); |
1da177e4 LT |
275 | } |
276 | ||
277 | /* | |
278 | * The architecture-independent dump_stack generator | |
279 | */ | |
280 | void dump_stack(void) | |
281 | { | |
282 | unsigned long stack; | |
283 | ||
176a2718 | 284 | show_trace(current, NULL, &stack); |
1da177e4 LT |
285 | } |
286 | ||
287 | EXPORT_SYMBOL(dump_stack); | |
288 | ||
289 | void show_registers(struct pt_regs *regs) | |
290 | { | |
291 | int i; | |
292 | int in_kernel = 1; | |
293 | unsigned long esp; | |
294 | unsigned short ss; | |
295 | ||
296 | esp = (unsigned long) (®s->esp); | |
0998e422 | 297 | savesegment(ss, ss); |
db753bdf | 298 | if (user_mode_vm(regs)) { |
1da177e4 LT |
299 | in_kernel = 0; |
300 | esp = regs->esp; | |
301 | ss = regs->xss & 0xffff; | |
302 | } | |
303 | print_modules(); | |
f354b3a9 DJ |
304 | printk(KERN_EMERG "CPU: %d\n" |
305 | KERN_EMERG "EIP: %04x:[<%08lx>] %s VLI\n" | |
306 | KERN_EMERG "EFLAGS: %08lx (%s %.*s)\n", | |
1da177e4 | 307 | smp_processor_id(), 0xffff & regs->xcs, regs->eip, |
96b644bd SH |
308 | print_tainted(), regs->eflags, init_utsname()->release, |
309 | (int)strcspn(init_utsname()->version, " "), | |
310 | init_utsname()->version); | |
9c107805 DJ |
311 | print_symbol(KERN_EMERG "EIP is at %s\n", regs->eip); |
312 | printk(KERN_EMERG "eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n", | |
1da177e4 | 313 | regs->eax, regs->ebx, regs->ecx, regs->edx); |
9c107805 | 314 | printk(KERN_EMERG "esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n", |
1da177e4 | 315 | regs->esi, regs->edi, regs->ebp, esp); |
9c107805 | 316 | printk(KERN_EMERG "ds: %04x es: %04x ss: %04x\n", |
1da177e4 | 317 | regs->xds & 0xffff, regs->xes & 0xffff, ss); |
7e04a118 CE |
318 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)", |
319 | TASK_COMM_LEN, current->comm, current->pid, | |
320 | current_thread_info(), current, current->thread_info); | |
1da177e4 LT |
321 | /* |
322 | * When in-kernel, we also print out the stack and code at the | |
323 | * time of the fault.. | |
324 | */ | |
325 | if (in_kernel) { | |
11a4180c | 326 | u8 *eip; |
99325326 CE |
327 | int code_bytes = 64; |
328 | unsigned char c; | |
1da177e4 | 329 | |
9c107805 | 330 | printk("\n" KERN_EMERG "Stack: "); |
176a2718 | 331 | show_stack_log_lvl(NULL, regs, (unsigned long *)esp, KERN_EMERG); |
1da177e4 | 332 | |
9c107805 | 333 | printk(KERN_EMERG "Code: "); |
1da177e4 | 334 | |
11a4180c AK |
335 | eip = (u8 *)regs->eip - 43; |
336 | if (eip < (u8 *)PAGE_OFFSET || | |
337 | probe_kernel_address(eip, c)) { | |
99325326 | 338 | /* try starting at EIP */ |
11a4180c | 339 | eip = (u8 *)regs->eip; |
99325326 CE |
340 | code_bytes = 32; |
341 | } | |
342 | for (i = 0; i < code_bytes; i++, eip++) { | |
11a4180c AK |
343 | if (eip < (u8 *)PAGE_OFFSET || |
344 | probe_kernel_address(eip, c)) { | |
1da177e4 LT |
345 | printk(" Bad EIP value."); |
346 | break; | |
347 | } | |
11a4180c | 348 | if (eip == (u8 *)regs->eip) |
1da177e4 LT |
349 | printk("<%02x> ", c); |
350 | else | |
351 | printk("%02x ", c); | |
352 | } | |
353 | } | |
354 | printk("\n"); | |
355 | } | |
356 | ||
91768d6c | 357 | int is_valid_bugaddr(unsigned long eip) |
1da177e4 LT |
358 | { |
359 | unsigned short ud2; | |
1da177e4 LT |
360 | |
361 | if (eip < PAGE_OFFSET) | |
91768d6c | 362 | return 0; |
11a4180c | 363 | if (probe_kernel_address((unsigned short *)eip, ud2)) |
91768d6c | 364 | return 0; |
1da177e4 | 365 | |
91768d6c | 366 | return ud2 == 0x0b0f; |
1da177e4 LT |
367 | } |
368 | ||
91768d6c JF |
369 | /* |
370 | * This is gone through when something in the kernel has done something bad and | |
371 | * is about to be terminated. | |
372 | */ | |
1da177e4 LT |
373 | void die(const char * str, struct pt_regs * regs, long err) |
374 | { | |
375 | static struct { | |
376 | spinlock_t lock; | |
377 | u32 lock_owner; | |
378 | int lock_owner_depth; | |
379 | } die = { | |
6cfd76a2 | 380 | .lock = __SPIN_LOCK_UNLOCKED(die.lock), |
1da177e4 LT |
381 | .lock_owner = -1, |
382 | .lock_owner_depth = 0 | |
383 | }; | |
384 | static int die_counter; | |
e43d674f | 385 | unsigned long flags; |
1da177e4 | 386 | |
dd287796 AM |
387 | oops_enter(); |
388 | ||
39c715b7 | 389 | if (die.lock_owner != raw_smp_processor_id()) { |
1da177e4 | 390 | console_verbose(); |
e43d674f | 391 | spin_lock_irqsave(&die.lock, flags); |
1da177e4 LT |
392 | die.lock_owner = smp_processor_id(); |
393 | die.lock_owner_depth = 0; | |
394 | bust_spinlocks(1); | |
395 | } | |
e43d674f JB |
396 | else |
397 | local_save_flags(flags); | |
1da177e4 LT |
398 | |
399 | if (++die.lock_owner_depth < 3) { | |
400 | int nl = 0; | |
7bee5c0f RD |
401 | unsigned long esp; |
402 | unsigned short ss; | |
403 | ||
91768d6c JF |
404 | report_bug(regs->eip); |
405 | ||
9c107805 | 406 | printk(KERN_EMERG "%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); |
1da177e4 | 407 | #ifdef CONFIG_PREEMPT |
9c107805 | 408 | printk(KERN_EMERG "PREEMPT "); |
1da177e4 LT |
409 | nl = 1; |
410 | #endif | |
411 | #ifdef CONFIG_SMP | |
9c107805 DJ |
412 | if (!nl) |
413 | printk(KERN_EMERG); | |
1da177e4 LT |
414 | printk("SMP "); |
415 | nl = 1; | |
416 | #endif | |
417 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
9c107805 DJ |
418 | if (!nl) |
419 | printk(KERN_EMERG); | |
1da177e4 LT |
420 | printk("DEBUG_PAGEALLOC"); |
421 | nl = 1; | |
422 | #endif | |
423 | if (nl) | |
424 | printk("\n"); | |
20c0d2d4 JB |
425 | if (notify_die(DIE_OOPS, str, regs, err, |
426 | current->thread.trap_no, SIGSEGV) != | |
7bee5c0f | 427 | NOTIFY_STOP) { |
20c0d2d4 | 428 | show_registers(regs); |
7bee5c0f RD |
429 | /* Executive summary in case the oops scrolled away */ |
430 | esp = (unsigned long) (®s->esp); | |
431 | savesegment(ss, ss); | |
432 | if (user_mode(regs)) { | |
433 | esp = regs->esp; | |
434 | ss = regs->xss & 0xffff; | |
435 | } | |
436 | printk(KERN_EMERG "EIP: [<%08lx>] ", regs->eip); | |
437 | print_symbol("%s", regs->eip); | |
438 | printk(" SS:ESP %04x:%08lx\n", ss, esp); | |
439 | } | |
20c0d2d4 JB |
440 | else |
441 | regs = NULL; | |
1da177e4 | 442 | } else |
9c107805 | 443 | printk(KERN_EMERG "Recursive die() failure, output suppressed\n"); |
1da177e4 LT |
444 | |
445 | bust_spinlocks(0); | |
446 | die.lock_owner = -1; | |
e43d674f | 447 | spin_unlock_irqrestore(&die.lock, flags); |
6e274d14 | 448 | |
20c0d2d4 JB |
449 | if (!regs) |
450 | return; | |
451 | ||
6e274d14 AN |
452 | if (kexec_should_crash(current)) |
453 | crash_kexec(regs); | |
454 | ||
1da177e4 LT |
455 | if (in_interrupt()) |
456 | panic("Fatal exception in interrupt"); | |
457 | ||
cea6a4ba | 458 | if (panic_on_oops) |
012c437d | 459 | panic("Fatal exception"); |
cea6a4ba | 460 | |
dd287796 | 461 | oops_exit(); |
1da177e4 LT |
462 | do_exit(SIGSEGV); |
463 | } | |
464 | ||
465 | static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err) | |
466 | { | |
717b594a | 467 | if (!user_mode_vm(regs)) |
1da177e4 LT |
468 | die(str, regs, err); |
469 | } | |
470 | ||
3d97ae5b PP |
471 | static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86, |
472 | struct pt_regs * regs, long error_code, | |
473 | siginfo_t *info) | |
1da177e4 | 474 | { |
4f339ecb AN |
475 | struct task_struct *tsk = current; |
476 | tsk->thread.error_code = error_code; | |
477 | tsk->thread.trap_no = trapnr; | |
478 | ||
1da177e4 LT |
479 | if (regs->eflags & VM_MASK) { |
480 | if (vm86) | |
481 | goto vm86_trap; | |
482 | goto trap_signal; | |
483 | } | |
484 | ||
717b594a | 485 | if (!user_mode(regs)) |
1da177e4 LT |
486 | goto kernel_trap; |
487 | ||
488 | trap_signal: { | |
1da177e4 LT |
489 | if (info) |
490 | force_sig_info(signr, info, tsk); | |
491 | else | |
492 | force_sig(signr, tsk); | |
493 | return; | |
494 | } | |
495 | ||
496 | kernel_trap: { | |
497 | if (!fixup_exception(regs)) | |
498 | die(str, regs, error_code); | |
499 | return; | |
500 | } | |
501 | ||
502 | vm86_trap: { | |
503 | int ret = handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, trapnr); | |
504 | if (ret) goto trap_signal; | |
505 | return; | |
506 | } | |
507 | } | |
508 | ||
509 | #define DO_ERROR(trapnr, signr, str, name) \ | |
510 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
511 | { \ | |
512 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
513 | == NOTIFY_STOP) \ | |
514 | return; \ | |
515 | do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \ | |
516 | } | |
517 | ||
518 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
519 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
520 | { \ | |
521 | siginfo_t info; \ | |
522 | info.si_signo = signr; \ | |
523 | info.si_errno = 0; \ | |
524 | info.si_code = sicode; \ | |
525 | info.si_addr = (void __user *)siaddr; \ | |
526 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
527 | == NOTIFY_STOP) \ | |
528 | return; \ | |
529 | do_trap(trapnr, signr, str, 0, regs, error_code, &info); \ | |
530 | } | |
531 | ||
532 | #define DO_VM86_ERROR(trapnr, signr, str, name) \ | |
533 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
534 | { \ | |
535 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
536 | == NOTIFY_STOP) \ | |
537 | return; \ | |
538 | do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \ | |
539 | } | |
540 | ||
541 | #define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
542 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
543 | { \ | |
544 | siginfo_t info; \ | |
545 | info.si_signo = signr; \ | |
546 | info.si_errno = 0; \ | |
547 | info.si_code = sicode; \ | |
548 | info.si_addr = (void __user *)siaddr; \ | |
549 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
550 | == NOTIFY_STOP) \ | |
551 | return; \ | |
552 | do_trap(trapnr, signr, str, 1, regs, error_code, &info); \ | |
553 | } | |
554 | ||
555 | DO_VM86_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->eip) | |
556 | #ifndef CONFIG_KPROBES | |
557 | DO_VM86_ERROR( 3, SIGTRAP, "int3", int3) | |
558 | #endif | |
559 | DO_VM86_ERROR( 4, SIGSEGV, "overflow", overflow) | |
560 | DO_VM86_ERROR( 5, SIGSEGV, "bounds", bounds) | |
631b0347 | 561 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->eip) |
1da177e4 LT |
562 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
563 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
564 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
565 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) | |
566 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
a879cbbb | 567 | DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0) |
1da177e4 | 568 | |
3d97ae5b PP |
569 | fastcall void __kprobes do_general_protection(struct pt_regs * regs, |
570 | long error_code) | |
1da177e4 LT |
571 | { |
572 | int cpu = get_cpu(); | |
573 | struct tss_struct *tss = &per_cpu(init_tss, cpu); | |
574 | struct thread_struct *thread = ¤t->thread; | |
575 | ||
576 | /* | |
577 | * Perform the lazy TSS's I/O bitmap copy. If the TSS has an | |
578 | * invalid offset set (the LAZY one) and the faulting thread has | |
579 | * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS | |
580 | * and we set the offset field correctly. Then we let the CPU to | |
581 | * restart the faulting instruction. | |
582 | */ | |
583 | if (tss->io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY && | |
584 | thread->io_bitmap_ptr) { | |
585 | memcpy(tss->io_bitmap, thread->io_bitmap_ptr, | |
586 | thread->io_bitmap_max); | |
587 | /* | |
588 | * If the previously set map was extending to higher ports | |
589 | * than the current one, pad extra space with 0xff (no access). | |
590 | */ | |
591 | if (thread->io_bitmap_max < tss->io_bitmap_max) | |
592 | memset((char *) tss->io_bitmap + | |
593 | thread->io_bitmap_max, 0xff, | |
594 | tss->io_bitmap_max - thread->io_bitmap_max); | |
595 | tss->io_bitmap_max = thread->io_bitmap_max; | |
596 | tss->io_bitmap_base = IO_BITMAP_OFFSET; | |
d5cd4aad | 597 | tss->io_bitmap_owner = thread; |
1da177e4 LT |
598 | put_cpu(); |
599 | return; | |
600 | } | |
601 | put_cpu(); | |
602 | ||
4f339ecb AN |
603 | current->thread.error_code = error_code; |
604 | current->thread.trap_no = 13; | |
605 | ||
1da177e4 LT |
606 | if (regs->eflags & VM_MASK) |
607 | goto gp_in_vm86; | |
608 | ||
717b594a | 609 | if (!user_mode(regs)) |
1da177e4 LT |
610 | goto gp_in_kernel; |
611 | ||
612 | current->thread.error_code = error_code; | |
613 | current->thread.trap_no = 13; | |
614 | force_sig(SIGSEGV, current); | |
615 | return; | |
616 | ||
617 | gp_in_vm86: | |
618 | local_irq_enable(); | |
619 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); | |
620 | return; | |
621 | ||
622 | gp_in_kernel: | |
623 | if (!fixup_exception(regs)) { | |
624 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
625 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
626 | return; | |
627 | die("general protection fault", regs, error_code); | |
628 | } | |
629 | } | |
630 | ||