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 | ||
c0d12172 DJ |
44 | #if defined(CONFIG_EDAC) |
45 | #include <linux/edac.h> | |
46 | #endif | |
47 | ||
1da177e4 LT |
48 | #include <asm/processor.h> |
49 | #include <asm/system.h> | |
1da177e4 LT |
50 | #include <asm/io.h> |
51 | #include <asm/atomic.h> | |
52 | #include <asm/debugreg.h> | |
53 | #include <asm/desc.h> | |
54 | #include <asm/i387.h> | |
55 | #include <asm/nmi.h> | |
176a2718 | 56 | #include <asm/unwind.h> |
1da177e4 LT |
57 | #include <asm/smp.h> |
58 | #include <asm/arch_hooks.h> | |
1eeb66a1 | 59 | #include <linux/kdebug.h> |
2b14a78c | 60 | #include <asm/stacktrace.h> |
1da177e4 | 61 | |
1da177e4 LT |
62 | #include <linux/module.h> |
63 | ||
64 | #include "mach_traps.h" | |
65 | ||
29cbc78b AK |
66 | int panic_on_unrecovered_nmi; |
67 | ||
1da177e4 LT |
68 | asmlinkage int system_call(void); |
69 | ||
1da177e4 LT |
70 | /* Do we ignore FPU interrupts ? */ |
71 | char ignore_fpu_irq = 0; | |
72 | ||
73 | /* | |
74 | * The IDT has to be page-aligned to simplify the Pentium | |
75 | * F0 0F bug workaround.. We have a special link segment | |
76 | * for this. | |
77 | */ | |
78 | struct desc_struct idt_table[256] __attribute__((__section__(".data.idt"))) = { {0, 0}, }; | |
79 | ||
80 | asmlinkage void divide_error(void); | |
81 | asmlinkage void debug(void); | |
82 | asmlinkage void nmi(void); | |
83 | asmlinkage void int3(void); | |
84 | asmlinkage void overflow(void); | |
85 | asmlinkage void bounds(void); | |
86 | asmlinkage void invalid_op(void); | |
87 | asmlinkage void device_not_available(void); | |
88 | asmlinkage void coprocessor_segment_overrun(void); | |
89 | asmlinkage void invalid_TSS(void); | |
90 | asmlinkage void segment_not_present(void); | |
91 | asmlinkage void stack_segment(void); | |
92 | asmlinkage void general_protection(void); | |
93 | asmlinkage void page_fault(void); | |
94 | asmlinkage void coprocessor_error(void); | |
95 | asmlinkage void simd_coprocessor_error(void); | |
96 | asmlinkage void alignment_check(void); | |
97 | asmlinkage void spurious_interrupt_bug(void); | |
98 | asmlinkage void machine_check(void); | |
99 | ||
0741f4d2 | 100 | int kstack_depth_to_print = 24; |
86c41837 | 101 | static unsigned int code_bytes = 64; |
e041c683 | 102 | |
1da177e4 LT |
103 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
104 | { | |
105 | return p > (void *)tinfo && | |
106 | p < (void *)tinfo + THREAD_SIZE - 3; | |
107 | } | |
108 | ||
109 | static inline unsigned long print_context_stack(struct thread_info *tinfo, | |
7aa89746 | 110 | unsigned long *stack, unsigned long ebp, |
2b14a78c | 111 | struct stacktrace_ops *ops, void *data) |
1da177e4 LT |
112 | { |
113 | unsigned long addr; | |
114 | ||
115 | #ifdef CONFIG_FRAME_POINTER | |
116 | while (valid_stack_ptr(tinfo, (void *)ebp)) { | |
808dbbb6 | 117 | unsigned long new_ebp; |
1da177e4 | 118 | addr = *(unsigned long *)(ebp + 4); |
2b14a78c | 119 | ops->address(data, addr); |
b88d4f1d IM |
120 | /* |
121 | * break out of recursive entries (such as | |
808dbbb6 LT |
122 | * end_of_stack_stop_unwind_function). Also, |
123 | * we can never allow a frame pointer to | |
124 | * move downwards! | |
b88d4f1d | 125 | */ |
808dbbb6 LT |
126 | new_ebp = *(unsigned long *)ebp; |
127 | if (new_ebp <= ebp) | |
b88d4f1d | 128 | break; |
808dbbb6 | 129 | ebp = new_ebp; |
1da177e4 LT |
130 | } |
131 | #else | |
132 | while (valid_stack_ptr(tinfo, stack)) { | |
133 | addr = *stack++; | |
7aa89746 | 134 | if (__kernel_text_address(addr)) |
2b14a78c | 135 | ops->address(data, addr); |
1da177e4 LT |
136 | } |
137 | #endif | |
138 | return ebp; | |
139 | } | |
140 | ||
b615ebda AK |
141 | #define MSG(msg) ops->warning(data, msg) |
142 | ||
2b14a78c AK |
143 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
144 | unsigned long *stack, | |
145 | struct stacktrace_ops *ops, void *data) | |
1da177e4 | 146 | { |
a32cf397 | 147 | unsigned long ebp = 0; |
1da177e4 LT |
148 | |
149 | if (!task) | |
150 | task = current; | |
151 | ||
a32cf397 | 152 | if (!stack) { |
2b14a78c AK |
153 | unsigned long dummy; |
154 | stack = &dummy; | |
028a690a | 155 | if (task != current) |
2b14a78c | 156 | stack = (unsigned long *)task->thread.esp; |
176a2718 JB |
157 | } |
158 | ||
a32cf397 AK |
159 | #ifdef CONFIG_FRAME_POINTER |
160 | if (!ebp) { | |
161 | if (task == current) { | |
162 | /* Grab ebp right from our regs */ | |
163 | asm ("movl %%ebp, %0" : "=r" (ebp) : ); | |
164 | } else { | |
165 | /* ebp is the last reg pushed by switch_to */ | |
166 | ebp = *(unsigned long *) task->thread.esp; | |
167 | } | |
1da177e4 | 168 | } |
a32cf397 | 169 | #endif |
1da177e4 LT |
170 | |
171 | while (1) { | |
172 | struct thread_info *context; | |
173 | context = (struct thread_info *) | |
174 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
2b14a78c AK |
175 | ebp = print_context_stack(context, stack, ebp, ops, data); |
176 | /* Should be after the line below, but somewhere | |
177 | in early boot context comes out corrupted and we | |
178 | can't reference it -AK */ | |
179 | if (ops->stack(data, "IRQ") < 0) | |
180 | break; | |
1da177e4 LT |
181 | stack = (unsigned long*)context->previous_esp; |
182 | if (!stack) | |
183 | break; | |
a36df98a | 184 | touch_nmi_watchdog(); |
1da177e4 LT |
185 | } |
186 | } | |
2b14a78c AK |
187 | EXPORT_SYMBOL(dump_trace); |
188 | ||
189 | static void | |
190 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
191 | { | |
192 | printk(data); | |
193 | print_symbol(msg, symbol); | |
194 | printk("\n"); | |
195 | } | |
196 | ||
197 | static void print_trace_warning(void *data, char *msg) | |
198 | { | |
199 | printk("%s%s\n", (char *)data, msg); | |
200 | } | |
201 | ||
202 | static int print_trace_stack(void *data, char *name) | |
203 | { | |
204 | return 0; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Print one address/symbol entries per line. | |
209 | */ | |
210 | static void print_trace_address(void *data, unsigned long addr) | |
211 | { | |
212 | printk("%s [<%08lx>] ", (char *)data, addr); | |
213 | print_symbol("%s\n", addr); | |
601e6255 | 214 | touch_nmi_watchdog(); |
2b14a78c AK |
215 | } |
216 | ||
217 | static struct stacktrace_ops print_trace_ops = { | |
218 | .warning = print_trace_warning, | |
219 | .warning_symbol = print_trace_warning_symbol, | |
220 | .stack = print_trace_stack, | |
221 | .address = print_trace_address, | |
222 | }; | |
223 | ||
224 | static void | |
225 | show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
226 | unsigned long * stack, char *log_lvl) | |
227 | { | |
228 | dump_trace(task, regs, stack, &print_trace_ops, log_lvl); | |
229 | printk("%s =======================\n", log_lvl); | |
230 | } | |
1da177e4 | 231 | |
2b14a78c AK |
232 | void show_trace(struct task_struct *task, struct pt_regs *regs, |
233 | unsigned long * stack) | |
7aa89746 | 234 | { |
176a2718 | 235 | show_trace_log_lvl(task, regs, stack, ""); |
7aa89746 CE |
236 | } |
237 | ||
176a2718 JB |
238 | static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
239 | unsigned long *esp, char *log_lvl) | |
1da177e4 LT |
240 | { |
241 | unsigned long *stack; | |
242 | int i; | |
243 | ||
244 | if (esp == NULL) { | |
245 | if (task) | |
246 | esp = (unsigned long*)task->thread.esp; | |
247 | else | |
248 | esp = (unsigned long *)&esp; | |
249 | } | |
250 | ||
251 | stack = esp; | |
252 | for(i = 0; i < kstack_depth_to_print; i++) { | |
253 | if (kstack_end(stack)) | |
254 | break; | |
75874d5c CE |
255 | if (i && ((i % 8) == 0)) |
256 | printk("\n%s ", log_lvl); | |
1da177e4 LT |
257 | printk("%08lx ", *stack++); |
258 | } | |
75874d5c | 259 | printk("\n%sCall Trace:\n", log_lvl); |
176a2718 | 260 | show_trace_log_lvl(task, regs, esp, log_lvl); |
7aa89746 CE |
261 | } |
262 | ||
263 | void show_stack(struct task_struct *task, unsigned long *esp) | |
264 | { | |
75874d5c | 265 | printk(" "); |
176a2718 | 266 | show_stack_log_lvl(task, NULL, esp, ""); |
1da177e4 LT |
267 | } |
268 | ||
269 | /* | |
270 | * The architecture-independent dump_stack generator | |
271 | */ | |
272 | void dump_stack(void) | |
273 | { | |
274 | unsigned long stack; | |
275 | ||
176a2718 | 276 | show_trace(current, NULL, &stack); |
1da177e4 LT |
277 | } |
278 | ||
279 | EXPORT_SYMBOL(dump_stack); | |
280 | ||
281 | void show_registers(struct pt_regs *regs) | |
282 | { | |
283 | int i; | |
284 | int in_kernel = 1; | |
285 | unsigned long esp; | |
464d1a78 | 286 | unsigned short ss, gs; |
1da177e4 LT |
287 | |
288 | esp = (unsigned long) (®s->esp); | |
0998e422 | 289 | savesegment(ss, ss); |
464d1a78 | 290 | savesegment(gs, gs); |
db753bdf | 291 | if (user_mode_vm(regs)) { |
1da177e4 LT |
292 | in_kernel = 0; |
293 | esp = regs->esp; | |
294 | ss = regs->xss & 0xffff; | |
295 | } | |
296 | print_modules(); | |
f354b3a9 DJ |
297 | printk(KERN_EMERG "CPU: %d\n" |
298 | KERN_EMERG "EIP: %04x:[<%08lx>] %s VLI\n" | |
299 | KERN_EMERG "EFLAGS: %08lx (%s %.*s)\n", | |
1da177e4 | 300 | smp_processor_id(), 0xffff & regs->xcs, regs->eip, |
96b644bd SH |
301 | print_tainted(), regs->eflags, init_utsname()->release, |
302 | (int)strcspn(init_utsname()->version, " "), | |
303 | init_utsname()->version); | |
9c107805 DJ |
304 | print_symbol(KERN_EMERG "EIP is at %s\n", regs->eip); |
305 | printk(KERN_EMERG "eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n", | |
1da177e4 | 306 | regs->eax, regs->ebx, regs->ecx, regs->edx); |
9c107805 | 307 | printk(KERN_EMERG "esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n", |
1da177e4 | 308 | regs->esi, regs->edi, regs->ebp, esp); |
464d1a78 JF |
309 | printk(KERN_EMERG "ds: %04x es: %04x fs: %04x gs: %04x ss: %04x\n", |
310 | regs->xds & 0xffff, regs->xes & 0xffff, regs->xfs & 0xffff, gs, ss); | |
7e04a118 CE |
311 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)", |
312 | TASK_COMM_LEN, current->comm, current->pid, | |
c9f4f06d | 313 | current_thread_info(), current, task_thread_info(current)); |
1da177e4 LT |
314 | /* |
315 | * When in-kernel, we also print out the stack and code at the | |
316 | * time of the fault.. | |
317 | */ | |
318 | if (in_kernel) { | |
11a4180c | 319 | u8 *eip; |
86c41837 CE |
320 | unsigned int code_prologue = code_bytes * 43 / 64; |
321 | unsigned int code_len = code_bytes; | |
99325326 | 322 | unsigned char c; |
1da177e4 | 323 | |
9c107805 | 324 | printk("\n" KERN_EMERG "Stack: "); |
176a2718 | 325 | show_stack_log_lvl(NULL, regs, (unsigned long *)esp, KERN_EMERG); |
1da177e4 | 326 | |
9c107805 | 327 | printk(KERN_EMERG "Code: "); |
1da177e4 | 328 | |
86c41837 | 329 | eip = (u8 *)regs->eip - code_prologue; |
11a4180c AK |
330 | if (eip < (u8 *)PAGE_OFFSET || |
331 | probe_kernel_address(eip, c)) { | |
99325326 | 332 | /* try starting at EIP */ |
11a4180c | 333 | eip = (u8 *)regs->eip; |
86c41837 | 334 | code_len = code_len - code_prologue + 1; |
99325326 | 335 | } |
86c41837 | 336 | for (i = 0; i < code_len; i++, eip++) { |
11a4180c AK |
337 | if (eip < (u8 *)PAGE_OFFSET || |
338 | probe_kernel_address(eip, c)) { | |
1da177e4 LT |
339 | printk(" Bad EIP value."); |
340 | break; | |
341 | } | |
11a4180c | 342 | if (eip == (u8 *)regs->eip) |
1da177e4 LT |
343 | printk("<%02x> ", c); |
344 | else | |
345 | printk("%02x ", c); | |
346 | } | |
347 | } | |
348 | printk("\n"); | |
349 | } | |
350 | ||
91768d6c | 351 | int is_valid_bugaddr(unsigned long eip) |
1da177e4 LT |
352 | { |
353 | unsigned short ud2; | |
1da177e4 LT |
354 | |
355 | if (eip < PAGE_OFFSET) | |
91768d6c | 356 | return 0; |
11a4180c | 357 | if (probe_kernel_address((unsigned short *)eip, ud2)) |
91768d6c | 358 | return 0; |
1da177e4 | 359 | |
91768d6c | 360 | return ud2 == 0x0b0f; |
1da177e4 LT |
361 | } |
362 | ||
91768d6c JF |
363 | /* |
364 | * This is gone through when something in the kernel has done something bad and | |
365 | * is about to be terminated. | |
366 | */ | |
1da177e4 LT |
367 | void die(const char * str, struct pt_regs * regs, long err) |
368 | { | |
369 | static struct { | |
370 | spinlock_t lock; | |
371 | u32 lock_owner; | |
372 | int lock_owner_depth; | |
373 | } die = { | |
6cfd76a2 | 374 | .lock = __SPIN_LOCK_UNLOCKED(die.lock), |
1da177e4 LT |
375 | .lock_owner = -1, |
376 | .lock_owner_depth = 0 | |
377 | }; | |
378 | static int die_counter; | |
e43d674f | 379 | unsigned long flags; |
1da177e4 | 380 | |
dd287796 AM |
381 | oops_enter(); |
382 | ||
39c715b7 | 383 | if (die.lock_owner != raw_smp_processor_id()) { |
1da177e4 | 384 | console_verbose(); |
e43d674f | 385 | spin_lock_irqsave(&die.lock, flags); |
1da177e4 LT |
386 | die.lock_owner = smp_processor_id(); |
387 | die.lock_owner_depth = 0; | |
388 | bust_spinlocks(1); | |
389 | } | |
e43d674f JB |
390 | else |
391 | local_save_flags(flags); | |
1da177e4 LT |
392 | |
393 | if (++die.lock_owner_depth < 3) { | |
394 | int nl = 0; | |
7bee5c0f RD |
395 | unsigned long esp; |
396 | unsigned short ss; | |
397 | ||
608e2619 | 398 | report_bug(regs->eip, regs); |
91768d6c | 399 | |
9c107805 | 400 | printk(KERN_EMERG "%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); |
1da177e4 | 401 | #ifdef CONFIG_PREEMPT |
9c107805 | 402 | printk(KERN_EMERG "PREEMPT "); |
1da177e4 LT |
403 | nl = 1; |
404 | #endif | |
405 | #ifdef CONFIG_SMP | |
9c107805 DJ |
406 | if (!nl) |
407 | printk(KERN_EMERG); | |
1da177e4 LT |
408 | printk("SMP "); |
409 | nl = 1; | |
410 | #endif | |
411 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
9c107805 DJ |
412 | if (!nl) |
413 | printk(KERN_EMERG); | |
1da177e4 LT |
414 | printk("DEBUG_PAGEALLOC"); |
415 | nl = 1; | |
416 | #endif | |
417 | if (nl) | |
418 | printk("\n"); | |
20c0d2d4 JB |
419 | if (notify_die(DIE_OOPS, str, regs, err, |
420 | current->thread.trap_no, SIGSEGV) != | |
7bee5c0f | 421 | NOTIFY_STOP) { |
20c0d2d4 | 422 | show_registers(regs); |
7bee5c0f RD |
423 | /* Executive summary in case the oops scrolled away */ |
424 | esp = (unsigned long) (®s->esp); | |
425 | savesegment(ss, ss); | |
426 | if (user_mode(regs)) { | |
427 | esp = regs->esp; | |
428 | ss = regs->xss & 0xffff; | |
429 | } | |
430 | printk(KERN_EMERG "EIP: [<%08lx>] ", regs->eip); | |
431 | print_symbol("%s", regs->eip); | |
432 | printk(" SS:ESP %04x:%08lx\n", ss, esp); | |
433 | } | |
20c0d2d4 JB |
434 | else |
435 | regs = NULL; | |
1da177e4 | 436 | } else |
9c107805 | 437 | printk(KERN_EMERG "Recursive die() failure, output suppressed\n"); |
1da177e4 LT |
438 | |
439 | bust_spinlocks(0); | |
440 | die.lock_owner = -1; | |
bcdcd8e7 | 441 | add_taint(TAINT_DIE); |
e43d674f | 442 | spin_unlock_irqrestore(&die.lock, flags); |
6e274d14 | 443 | |
20c0d2d4 JB |
444 | if (!regs) |
445 | return; | |
446 | ||
6e274d14 AN |
447 | if (kexec_should_crash(current)) |
448 | crash_kexec(regs); | |
449 | ||
1da177e4 LT |
450 | if (in_interrupt()) |
451 | panic("Fatal exception in interrupt"); | |
452 | ||
cea6a4ba | 453 | if (panic_on_oops) |
012c437d | 454 | panic("Fatal exception"); |
cea6a4ba | 455 | |
dd287796 | 456 | oops_exit(); |
1da177e4 LT |
457 | do_exit(SIGSEGV); |
458 | } | |
459 | ||
460 | static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err) | |
461 | { | |
717b594a | 462 | if (!user_mode_vm(regs)) |
1da177e4 LT |
463 | die(str, regs, err); |
464 | } | |
465 | ||
3d97ae5b PP |
466 | static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86, |
467 | struct pt_regs * regs, long error_code, | |
468 | siginfo_t *info) | |
1da177e4 | 469 | { |
4f339ecb | 470 | struct task_struct *tsk = current; |
4f339ecb | 471 | |
1da177e4 LT |
472 | if (regs->eflags & VM_MASK) { |
473 | if (vm86) | |
474 | goto vm86_trap; | |
475 | goto trap_signal; | |
476 | } | |
477 | ||
717b594a | 478 | if (!user_mode(regs)) |
1da177e4 LT |
479 | goto kernel_trap; |
480 | ||
481 | trap_signal: { | |
d1895183 AK |
482 | /* |
483 | * We want error_code and trap_no set for userspace faults and | |
484 | * kernelspace faults which result in die(), but not | |
485 | * kernelspace faults which are fixed up. die() gives the | |
486 | * process no chance to handle the signal and notice the | |
487 | * kernel fault information, so that won't result in polluting | |
488 | * the information about previously queued, but not yet | |
489 | * delivered, faults. See also do_general_protection below. | |
490 | */ | |
491 | tsk->thread.error_code = error_code; | |
492 | tsk->thread.trap_no = trapnr; | |
493 | ||
1da177e4 LT |
494 | if (info) |
495 | force_sig_info(signr, info, tsk); | |
496 | else | |
497 | force_sig(signr, tsk); | |
498 | return; | |
499 | } | |
500 | ||
501 | kernel_trap: { | |
d1895183 AK |
502 | if (!fixup_exception(regs)) { |
503 | tsk->thread.error_code = error_code; | |
504 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 505 | die(str, regs, error_code); |
d1895183 | 506 | } |
1da177e4 LT |
507 | return; |
508 | } | |
509 | ||
510 | vm86_trap: { | |
511 | int ret = handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, trapnr); | |
512 | if (ret) goto trap_signal; | |
513 | return; | |
514 | } | |
515 | } | |
516 | ||
517 | #define DO_ERROR(trapnr, signr, str, name) \ | |
518 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
519 | { \ | |
520 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
521 | == NOTIFY_STOP) \ | |
522 | return; \ | |
523 | do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \ | |
524 | } | |
525 | ||
a10d9a71 | 526 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr, irq) \ |
1da177e4 LT |
527 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ |
528 | { \ | |
529 | siginfo_t info; \ | |
a10d9a71 PZ |
530 | if (irq) \ |
531 | local_irq_enable(); \ | |
1da177e4 LT |
532 | info.si_signo = signr; \ |
533 | info.si_errno = 0; \ | |
534 | info.si_code = sicode; \ | |
535 | info.si_addr = (void __user *)siaddr; \ | |
536 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
537 | == NOTIFY_STOP) \ | |
538 | return; \ | |
539 | do_trap(trapnr, signr, str, 0, regs, error_code, &info); \ | |
540 | } | |
541 | ||
542 | #define DO_VM86_ERROR(trapnr, signr, str, name) \ | |
543 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
544 | { \ | |
545 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
546 | == NOTIFY_STOP) \ | |
547 | return; \ | |
548 | do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \ | |
549 | } | |
550 | ||
551 | #define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
552 | fastcall void do_##name(struct pt_regs * regs, long error_code) \ | |
553 | { \ | |
554 | siginfo_t info; \ | |
555 | info.si_signo = signr; \ | |
556 | info.si_errno = 0; \ | |
557 | info.si_code = sicode; \ | |
558 | info.si_addr = (void __user *)siaddr; \ | |
559 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
560 | == NOTIFY_STOP) \ | |
561 | return; \ | |
562 | do_trap(trapnr, signr, str, 1, regs, error_code, &info); \ | |
563 | } | |
564 | ||
565 | DO_VM86_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->eip) | |
566 | #ifndef CONFIG_KPROBES | |
567 | DO_VM86_ERROR( 3, SIGTRAP, "int3", int3) | |
568 | #endif | |
569 | DO_VM86_ERROR( 4, SIGSEGV, "overflow", overflow) | |
570 | DO_VM86_ERROR( 5, SIGSEGV, "bounds", bounds) | |
a10d9a71 | 571 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->eip, 0) |
1da177e4 LT |
572 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
573 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
574 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
575 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) | |
a10d9a71 PZ |
576 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0) |
577 | DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0, 1) | |
1da177e4 | 578 | |
3d97ae5b PP |
579 | fastcall void __kprobes do_general_protection(struct pt_regs * regs, |
580 | long error_code) | |
1da177e4 LT |
581 | { |
582 | int cpu = get_cpu(); | |
583 | struct tss_struct *tss = &per_cpu(init_tss, cpu); | |
584 | struct thread_struct *thread = ¤t->thread; | |
585 | ||
586 | /* | |
587 | * Perform the lazy TSS's I/O bitmap copy. If the TSS has an | |
588 | * invalid offset set (the LAZY one) and the faulting thread has | |
589 | * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS | |
590 | * and we set the offset field correctly. Then we let the CPU to | |
591 | * restart the faulting instruction. | |
592 | */ | |
a75c54f9 | 593 | if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY && |
1da177e4 LT |
594 | thread->io_bitmap_ptr) { |
595 | memcpy(tss->io_bitmap, thread->io_bitmap_ptr, | |
596 | thread->io_bitmap_max); | |
597 | /* | |
598 | * If the previously set map was extending to higher ports | |
599 | * than the current one, pad extra space with 0xff (no access). | |
600 | */ | |
601 | if (thread->io_bitmap_max < tss->io_bitmap_max) | |
602 | memset((char *) tss->io_bitmap + | |
603 | thread->io_bitmap_max, 0xff, | |
604 | tss->io_bitmap_max - thread->io_bitmap_max); | |
605 | tss->io_bitmap_max = thread->io_bitmap_max; | |
a75c54f9 | 606 | tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET; |
d5cd4aad | 607 | tss->io_bitmap_owner = thread; |
1da177e4 LT |
608 | put_cpu(); |
609 | return; | |
610 | } | |
611 | put_cpu(); | |
612 | ||
613 | if (regs->eflags & VM_MASK) | |
614 | goto gp_in_vm86; | |
615 | ||
717b594a | 616 | if (!user_mode(regs)) |
1da177e4 LT |
617 | goto gp_in_kernel; |
618 | ||
619 | current->thread.error_code = error_code; | |
620 | current->thread.trap_no = 13; | |
abd4f750 MAS |
621 | if (show_unhandled_signals && unhandled_signal(current, SIGSEGV) && |
622 | printk_ratelimit()) | |
623 | printk(KERN_INFO | |
624 | "%s[%d] general protection eip:%lx esp:%lx error:%lx\n", | |
625 | current->comm, current->pid, | |
626 | regs->eip, regs->esp, error_code); | |
627 | ||
1da177e4 LT |
628 | force_sig(SIGSEGV, current); |
629 | return; | |
630 | ||
631 | gp_in_vm86: | |
632 | local_irq_enable(); | |
633 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); | |
634 | return; | |
635 | ||
636 | gp_in_kernel: | |
637 | if (!fixup_exception(regs)) { | |
d1895183 AK |
638 | current->thread.error_code = error_code; |
639 | current->thread.trap_no = 13; | |
1da177e4 LT |
640 | if (notify_die(DIE_GPF, "general protection fault", regs, |
641 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
642 | return; | |
643 | die("general protection fault", regs, error_code); | |
644 | } | |
645 | } | |
646 | ||