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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1991, 1992 Linus Torvalds |
3 | * | |
4 | * Pentium III FXSR, SSE support | |
5 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
6 | */ | |
7 | ||
8 | /* | |
9 | * 'Traps.c' handles hardware traps and faults after we have saved some | |
10 | * state in 'asm.s'. | |
11 | */ | |
1da177e4 LT |
12 | #include <linux/sched.h> |
13 | #include <linux/kernel.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/timer.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/kallsyms.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/utsname.h> | |
26 | #include <linux/kprobes.h> | |
6e274d14 | 27 | #include <linux/kexec.h> |
176a2718 | 28 | #include <linux/unwind.h> |
1e2af92e | 29 | #include <linux/uaccess.h> |
a36df98a | 30 | #include <linux/nmi.h> |
91768d6c | 31 | #include <linux/bug.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 | ||
c0d12172 DJ |
42 | #if defined(CONFIG_EDAC) |
43 | #include <linux/edac.h> | |
44 | #endif | |
45 | ||
1da177e4 LT |
46 | #include <asm/processor.h> |
47 | #include <asm/system.h> | |
1da177e4 LT |
48 | #include <asm/io.h> |
49 | #include <asm/atomic.h> | |
50 | #include <asm/debugreg.h> | |
51 | #include <asm/desc.h> | |
52 | #include <asm/i387.h> | |
53 | #include <asm/nmi.h> | |
176a2718 | 54 | #include <asm/unwind.h> |
1da177e4 LT |
55 | #include <asm/smp.h> |
56 | #include <asm/arch_hooks.h> | |
1eeb66a1 | 57 | #include <linux/kdebug.h> |
2b14a78c | 58 | #include <asm/stacktrace.h> |
1da177e4 | 59 | |
1da177e4 LT |
60 | #include <linux/module.h> |
61 | ||
62 | #include "mach_traps.h" | |
63 | ||
29cbc78b AK |
64 | int panic_on_unrecovered_nmi; |
65 | ||
dbeb2be2 RR |
66 | DECLARE_BITMAP(used_vectors, NR_VECTORS); |
67 | EXPORT_SYMBOL_GPL(used_vectors); | |
68 | ||
1da177e4 LT |
69 | asmlinkage int system_call(void); |
70 | ||
1da177e4 LT |
71 | /* Do we ignore FPU interrupts ? */ |
72 | char ignore_fpu_irq = 0; | |
73 | ||
74 | /* | |
75 | * The IDT has to be page-aligned to simplify the Pentium | |
76 | * F0 0F bug workaround.. We have a special link segment | |
77 | * for this. | |
78 | */ | |
010d4f82 | 79 | gate_desc idt_table[256] |
6842ef0e | 80 | __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, }; |
1da177e4 LT |
81 | |
82 | asmlinkage void divide_error(void); | |
83 | asmlinkage void debug(void); | |
84 | asmlinkage void nmi(void); | |
85 | asmlinkage void int3(void); | |
86 | asmlinkage void overflow(void); | |
87 | asmlinkage void bounds(void); | |
88 | asmlinkage void invalid_op(void); | |
89 | asmlinkage void device_not_available(void); | |
90 | asmlinkage void coprocessor_segment_overrun(void); | |
91 | asmlinkage void invalid_TSS(void); | |
92 | asmlinkage void segment_not_present(void); | |
93 | asmlinkage void stack_segment(void); | |
94 | asmlinkage void general_protection(void); | |
95 | asmlinkage void page_fault(void); | |
96 | asmlinkage void coprocessor_error(void); | |
97 | asmlinkage void simd_coprocessor_error(void); | |
98 | asmlinkage void alignment_check(void); | |
99 | asmlinkage void spurious_interrupt_bug(void); | |
100 | asmlinkage void machine_check(void); | |
101 | ||
0741f4d2 | 102 | int kstack_depth_to_print = 24; |
86c41837 | 103 | static unsigned int code_bytes = 64; |
e041c683 | 104 | |
a5ff677c HH |
105 | void printk_address(unsigned long address, int reliable) |
106 | { | |
107 | #ifdef CONFIG_KALLSYMS | |
108 | unsigned long offset = 0, symsize; | |
109 | const char *symname; | |
110 | char *modname; | |
111 | char *delim = ":"; | |
112 | char namebuf[128]; | |
113 | char reliab[4] = ""; | |
114 | ||
115 | symname = kallsyms_lookup(address, &symsize, &offset, | |
116 | &modname, namebuf); | |
117 | if (!symname) { | |
118 | printk(" [<%08lx>]\n", address); | |
119 | return; | |
120 | } | |
121 | if (!reliable) | |
122 | strcpy(reliab, "? "); | |
123 | ||
124 | if (!modname) | |
125 | modname = delim = ""; | |
126 | printk(" [<%08lx>] %s%s%s%s%s+0x%lx/0x%lx\n", | |
127 | address, reliab, delim, modname, delim, symname, offset, symsize); | |
128 | #else | |
129 | printk(" [<%08lx>]\n", address); | |
130 | #endif | |
131 | } | |
132 | ||
36ad4885 | 133 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p, unsigned size) |
1da177e4 LT |
134 | { |
135 | return p > (void *)tinfo && | |
36ad4885 | 136 | p <= (void *)tinfo + THREAD_SIZE - size; |
1da177e4 LT |
137 | } |
138 | ||
36ad4885 LT |
139 | /* The form of the top of the frame on the stack */ |
140 | struct stack_frame { | |
141 | struct stack_frame *next_frame; | |
142 | unsigned long return_address; | |
143 | }; | |
144 | ||
1da177e4 | 145 | static inline unsigned long print_context_stack(struct thread_info *tinfo, |
65ea5b03 | 146 | unsigned long *stack, unsigned long bp, |
9689ba8a | 147 | const struct stacktrace_ops *ops, void *data) |
1da177e4 | 148 | { |
65ea5b03 | 149 | struct stack_frame *frame = (struct stack_frame *)bp; |
36ad4885 | 150 | |
36ad4885 LT |
151 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack))) { |
152 | unsigned long addr; | |
153 | ||
e9d4efdd AV |
154 | addr = *stack; |
155 | if (__kernel_text_address(addr)) { | |
156 | if ((unsigned long) stack == bp + 4) { | |
157 | ops->address(data, addr, 1); | |
158 | frame = frame->next_frame; | |
159 | bp = (unsigned long) frame; | |
160 | } else { | |
5bc27dc2 | 161 | ops->address(data, addr, bp == 0); |
e9d4efdd AV |
162 | } |
163 | } | |
164 | stack++; | |
1da177e4 | 165 | } |
65ea5b03 | 166 | return bp; |
1da177e4 LT |
167 | } |
168 | ||
b615ebda AK |
169 | #define MSG(msg) ops->warning(data, msg) |
170 | ||
2b14a78c | 171 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
5bc27dc2 | 172 | unsigned long *stack, unsigned long bp, |
9689ba8a | 173 | const struct stacktrace_ops *ops, void *data) |
1da177e4 | 174 | { |
1da177e4 LT |
175 | if (!task) |
176 | task = current; | |
177 | ||
a32cf397 | 178 | if (!stack) { |
2b14a78c AK |
179 | unsigned long dummy; |
180 | stack = &dummy; | |
028a690a | 181 | if (task != current) |
faca6227 | 182 | stack = (unsigned long *)task->thread.sp; |
176a2718 JB |
183 | } |
184 | ||
a32cf397 | 185 | #ifdef CONFIG_FRAME_POINTER |
65ea5b03 | 186 | if (!bp) { |
a32cf397 | 187 | if (task == current) { |
65ea5b03 PA |
188 | /* Grab bp right from our regs */ |
189 | asm ("movl %%ebp, %0" : "=r" (bp) : ); | |
a32cf397 | 190 | } else { |
65ea5b03 | 191 | /* bp is the last reg pushed by switch_to */ |
faca6227 | 192 | bp = *(unsigned long *) task->thread.sp; |
a32cf397 | 193 | } |
1da177e4 | 194 | } |
a32cf397 | 195 | #endif |
1da177e4 LT |
196 | |
197 | while (1) { | |
198 | struct thread_info *context; | |
199 | context = (struct thread_info *) | |
200 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
65ea5b03 | 201 | bp = print_context_stack(context, stack, bp, ops, data); |
2b14a78c AK |
202 | /* Should be after the line below, but somewhere |
203 | in early boot context comes out corrupted and we | |
204 | can't reference it -AK */ | |
205 | if (ops->stack(data, "IRQ") < 0) | |
206 | break; | |
1da177e4 LT |
207 | stack = (unsigned long*)context->previous_esp; |
208 | if (!stack) | |
209 | break; | |
a36df98a | 210 | touch_nmi_watchdog(); |
1da177e4 LT |
211 | } |
212 | } | |
2b14a78c AK |
213 | EXPORT_SYMBOL(dump_trace); |
214 | ||
215 | static void | |
216 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
217 | { | |
218 | printk(data); | |
219 | print_symbol(msg, symbol); | |
220 | printk("\n"); | |
221 | } | |
222 | ||
223 | static void print_trace_warning(void *data, char *msg) | |
224 | { | |
225 | printk("%s%s\n", (char *)data, msg); | |
226 | } | |
227 | ||
228 | static int print_trace_stack(void *data, char *name) | |
229 | { | |
230 | return 0; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Print one address/symbol entries per line. | |
235 | */ | |
bc850d6b | 236 | static void print_trace_address(void *data, unsigned long addr, int reliable) |
2b14a78c AK |
237 | { |
238 | printk("%s [<%08lx>] ", (char *)data, addr); | |
bc850d6b AV |
239 | if (!reliable) |
240 | printk("? "); | |
2b14a78c | 241 | print_symbol("%s\n", addr); |
601e6255 | 242 | touch_nmi_watchdog(); |
2b14a78c AK |
243 | } |
244 | ||
9689ba8a | 245 | static const struct stacktrace_ops print_trace_ops = { |
2b14a78c AK |
246 | .warning = print_trace_warning, |
247 | .warning_symbol = print_trace_warning_symbol, | |
248 | .stack = print_trace_stack, | |
249 | .address = print_trace_address, | |
250 | }; | |
251 | ||
252 | static void | |
253 | show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
5bc27dc2 | 254 | unsigned long *stack, unsigned long bp, char *log_lvl) |
2b14a78c | 255 | { |
5bc27dc2 | 256 | dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl); |
2b14a78c AK |
257 | printk("%s =======================\n", log_lvl); |
258 | } | |
1da177e4 | 259 | |
2b14a78c | 260 | void show_trace(struct task_struct *task, struct pt_regs *regs, |
5bc27dc2 | 261 | unsigned long *stack, unsigned long bp) |
7aa89746 | 262 | { |
5bc27dc2 | 263 | show_trace_log_lvl(task, regs, stack, bp, ""); |
7aa89746 CE |
264 | } |
265 | ||
176a2718 | 266 | static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
5bc27dc2 | 267 | unsigned long *sp, unsigned long bp, char *log_lvl) |
1da177e4 LT |
268 | { |
269 | unsigned long *stack; | |
270 | int i; | |
271 | ||
65ea5b03 | 272 | if (sp == NULL) { |
1da177e4 | 273 | if (task) |
faca6227 | 274 | sp = (unsigned long*)task->thread.sp; |
1da177e4 | 275 | else |
65ea5b03 | 276 | sp = (unsigned long *)&sp; |
1da177e4 LT |
277 | } |
278 | ||
65ea5b03 | 279 | stack = sp; |
1da177e4 LT |
280 | for(i = 0; i < kstack_depth_to_print; i++) { |
281 | if (kstack_end(stack)) | |
282 | break; | |
75874d5c CE |
283 | if (i && ((i % 8) == 0)) |
284 | printk("\n%s ", log_lvl); | |
1da177e4 LT |
285 | printk("%08lx ", *stack++); |
286 | } | |
75874d5c | 287 | printk("\n%sCall Trace:\n", log_lvl); |
5bc27dc2 | 288 | show_trace_log_lvl(task, regs, sp, bp, log_lvl); |
7aa89746 CE |
289 | } |
290 | ||
65ea5b03 | 291 | void show_stack(struct task_struct *task, unsigned long *sp) |
7aa89746 | 292 | { |
75874d5c | 293 | printk(" "); |
5bc27dc2 | 294 | show_stack_log_lvl(task, NULL, sp, 0, ""); |
1da177e4 LT |
295 | } |
296 | ||
297 | /* | |
298 | * The architecture-independent dump_stack generator | |
299 | */ | |
300 | void dump_stack(void) | |
301 | { | |
302 | unsigned long stack; | |
5bc27dc2 AV |
303 | unsigned long bp = 0; |
304 | ||
305 | #ifdef CONFIG_FRAME_POINTER | |
306 | if (!bp) | |
307 | asm("movl %%ebp, %0" : "=r" (bp):); | |
308 | #endif | |
1da177e4 | 309 | |
57c351de AV |
310 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", |
311 | current->pid, current->comm, print_tainted(), | |
312 | init_utsname()->release, | |
313 | (int)strcspn(init_utsname()->version, " "), | |
314 | init_utsname()->version); | |
5bc27dc2 | 315 | show_trace(current, NULL, &stack, bp); |
1da177e4 LT |
316 | } |
317 | ||
318 | EXPORT_SYMBOL(dump_stack); | |
319 | ||
320 | void show_registers(struct pt_regs *regs) | |
321 | { | |
322 | int i; | |
9d975ebd | 323 | |
1da177e4 | 324 | print_modules(); |
9d975ebd | 325 | __show_registers(regs, 0); |
7e04a118 | 326 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)", |
19c5870c | 327 | TASK_COMM_LEN, current->comm, task_pid_nr(current), |
c9f4f06d | 328 | current_thread_info(), current, task_thread_info(current)); |
1da177e4 LT |
329 | /* |
330 | * When in-kernel, we also print out the stack and code at the | |
331 | * time of the fault.. | |
332 | */ | |
9d975ebd | 333 | if (!user_mode_vm(regs)) { |
65ea5b03 | 334 | u8 *ip; |
86c41837 CE |
335 | unsigned int code_prologue = code_bytes * 43 / 64; |
336 | unsigned int code_len = code_bytes; | |
99325326 | 337 | unsigned char c; |
1da177e4 | 338 | |
9c107805 | 339 | printk("\n" KERN_EMERG "Stack: "); |
5bc27dc2 | 340 | show_stack_log_lvl(NULL, regs, ®s->sp, 0, KERN_EMERG); |
1da177e4 | 341 | |
9c107805 | 342 | printk(KERN_EMERG "Code: "); |
1da177e4 | 343 | |
65ea5b03 PA |
344 | ip = (u8 *)regs->ip - code_prologue; |
345 | if (ip < (u8 *)PAGE_OFFSET || | |
346 | probe_kernel_address(ip, c)) { | |
99325326 | 347 | /* try starting at EIP */ |
65ea5b03 | 348 | ip = (u8 *)regs->ip; |
86c41837 | 349 | code_len = code_len - code_prologue + 1; |
99325326 | 350 | } |
65ea5b03 PA |
351 | for (i = 0; i < code_len; i++, ip++) { |
352 | if (ip < (u8 *)PAGE_OFFSET || | |
353 | probe_kernel_address(ip, c)) { | |
1da177e4 LT |
354 | printk(" Bad EIP value."); |
355 | break; | |
356 | } | |
65ea5b03 | 357 | if (ip == (u8 *)regs->ip) |
1da177e4 LT |
358 | printk("<%02x> ", c); |
359 | else | |
360 | printk("%02x ", c); | |
361 | } | |
362 | } | |
363 | printk("\n"); | |
364 | } | |
365 | ||
65ea5b03 | 366 | int is_valid_bugaddr(unsigned long ip) |
1da177e4 LT |
367 | { |
368 | unsigned short ud2; | |
1da177e4 | 369 | |
65ea5b03 | 370 | if (ip < PAGE_OFFSET) |
91768d6c | 371 | return 0; |
65ea5b03 | 372 | if (probe_kernel_address((unsigned short *)ip, ud2)) |
91768d6c | 373 | return 0; |
1da177e4 | 374 | |
91768d6c | 375 | return ud2 == 0x0b0f; |
1da177e4 LT |
376 | } |
377 | ||
a604b380 HH |
378 | static int die_counter; |
379 | ||
380 | int __kprobes __die(const char * str, struct pt_regs * regs, long err) | |
381 | { | |
382 | unsigned long sp; | |
383 | unsigned short ss; | |
384 | ||
385 | printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter); | |
386 | #ifdef CONFIG_PREEMPT | |
387 | printk("PREEMPT "); | |
388 | #endif | |
389 | #ifdef CONFIG_SMP | |
390 | printk("SMP "); | |
391 | #endif | |
392 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
393 | printk("DEBUG_PAGEALLOC"); | |
394 | #endif | |
395 | printk("\n"); | |
396 | ||
397 | if (notify_die(DIE_OOPS, str, regs, err, | |
398 | current->thread.trap_no, SIGSEGV) != | |
399 | NOTIFY_STOP) { | |
400 | show_registers(regs); | |
401 | /* Executive summary in case the oops scrolled away */ | |
402 | sp = (unsigned long) (®s->sp); | |
403 | savesegment(ss, ss); | |
404 | if (user_mode(regs)) { | |
405 | sp = regs->sp; | |
406 | ss = regs->ss & 0xffff; | |
407 | } | |
408 | printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip); | |
409 | print_symbol("%s", regs->ip); | |
410 | printk(" SS:ESP %04x:%08lx\n", ss, sp); | |
411 | return 0; | |
412 | } else { | |
413 | return 1; | |
414 | } | |
415 | } | |
416 | ||
91768d6c JF |
417 | /* |
418 | * This is gone through when something in the kernel has done something bad and | |
419 | * is about to be terminated. | |
420 | */ | |
1da177e4 LT |
421 | void die(const char * str, struct pt_regs * regs, long err) |
422 | { | |
423 | static struct { | |
39743c9e | 424 | raw_spinlock_t lock; |
1da177e4 LT |
425 | u32 lock_owner; |
426 | int lock_owner_depth; | |
427 | } die = { | |
39743c9e | 428 | .lock = __RAW_SPIN_LOCK_UNLOCKED, |
1da177e4 LT |
429 | .lock_owner = -1, |
430 | .lock_owner_depth = 0 | |
431 | }; | |
e43d674f | 432 | unsigned long flags; |
1da177e4 | 433 | |
dd287796 AM |
434 | oops_enter(); |
435 | ||
39c715b7 | 436 | if (die.lock_owner != raw_smp_processor_id()) { |
1da177e4 | 437 | console_verbose(); |
c0a698b7 | 438 | raw_local_irq_save(flags); |
39743c9e | 439 | __raw_spin_lock(&die.lock); |
1da177e4 LT |
440 | die.lock_owner = smp_processor_id(); |
441 | die.lock_owner_depth = 0; | |
442 | bust_spinlocks(1); | |
c0a698b7 IM |
443 | } else |
444 | raw_local_irq_save(flags); | |
1da177e4 LT |
445 | |
446 | if (++die.lock_owner_depth < 3) { | |
65ea5b03 | 447 | report_bug(regs->ip, regs); |
91768d6c | 448 | |
a604b380 | 449 | if (__die(str, regs, err)) |
20c0d2d4 | 450 | regs = NULL; |
a604b380 | 451 | } else { |
9c107805 | 452 | printk(KERN_EMERG "Recursive die() failure, output suppressed\n"); |
a604b380 | 453 | } |
1da177e4 LT |
454 | |
455 | bust_spinlocks(0); | |
456 | die.lock_owner = -1; | |
bcdcd8e7 | 457 | add_taint(TAINT_DIE); |
39743c9e AK |
458 | __raw_spin_unlock(&die.lock); |
459 | raw_local_irq_restore(flags); | |
6e274d14 | 460 | |
20c0d2d4 JB |
461 | if (!regs) |
462 | return; | |
463 | ||
6e274d14 AN |
464 | if (kexec_should_crash(current)) |
465 | crash_kexec(regs); | |
466 | ||
1da177e4 LT |
467 | if (in_interrupt()) |
468 | panic("Fatal exception in interrupt"); | |
469 | ||
cea6a4ba | 470 | if (panic_on_oops) |
012c437d | 471 | panic("Fatal exception"); |
cea6a4ba | 472 | |
dd287796 | 473 | oops_exit(); |
1da177e4 LT |
474 | do_exit(SIGSEGV); |
475 | } | |
476 | ||
477 | static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err) | |
478 | { | |
717b594a | 479 | if (!user_mode_vm(regs)) |
1da177e4 LT |
480 | die(str, regs, err); |
481 | } | |
482 | ||
3d97ae5b PP |
483 | static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86, |
484 | struct pt_regs * regs, long error_code, | |
485 | siginfo_t *info) | |
1da177e4 | 486 | { |
4f339ecb | 487 | struct task_struct *tsk = current; |
4f339ecb | 488 | |
65ea5b03 | 489 | if (regs->flags & VM_MASK) { |
1da177e4 LT |
490 | if (vm86) |
491 | goto vm86_trap; | |
492 | goto trap_signal; | |
493 | } | |
494 | ||
717b594a | 495 | if (!user_mode(regs)) |
1da177e4 LT |
496 | goto kernel_trap; |
497 | ||
498 | trap_signal: { | |
d1895183 AK |
499 | /* |
500 | * We want error_code and trap_no set for userspace faults and | |
501 | * kernelspace faults which result in die(), but not | |
502 | * kernelspace faults which are fixed up. die() gives the | |
503 | * process no chance to handle the signal and notice the | |
504 | * kernel fault information, so that won't result in polluting | |
505 | * the information about previously queued, but not yet | |
506 | * delivered, faults. See also do_general_protection below. | |
507 | */ | |
508 | tsk->thread.error_code = error_code; | |
509 | tsk->thread.trap_no = trapnr; | |
510 | ||
1da177e4 LT |
511 | if (info) |
512 | force_sig_info(signr, info, tsk); | |
513 | else | |
514 | force_sig(signr, tsk); | |
515 | return; | |
516 | } | |
517 | ||
518 | kernel_trap: { | |
d1895183 AK |
519 | if (!fixup_exception(regs)) { |
520 | tsk->thread.error_code = error_code; | |
521 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 522 | die(str, regs, error_code); |
d1895183 | 523 | } |
1da177e4 LT |
524 | return; |
525 | } | |
526 | ||
527 | vm86_trap: { | |
528 | int ret = handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, trapnr); | |
529 | if (ret) goto trap_signal; | |
530 | return; | |
531 | } | |
532 | } | |
533 | ||
534 | #define DO_ERROR(trapnr, signr, str, name) \ | |
75604d7f | 535 | void do_##name(struct pt_regs * regs, long error_code) \ |
1da177e4 LT |
536 | { \ |
537 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
538 | == NOTIFY_STOP) \ | |
539 | return; \ | |
540 | do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \ | |
541 | } | |
542 | ||
a10d9a71 | 543 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr, irq) \ |
75604d7f | 544 | void do_##name(struct pt_regs * regs, long error_code) \ |
1da177e4 LT |
545 | { \ |
546 | siginfo_t info; \ | |
a10d9a71 PZ |
547 | if (irq) \ |
548 | local_irq_enable(); \ | |
1da177e4 LT |
549 | info.si_signo = signr; \ |
550 | info.si_errno = 0; \ | |
551 | info.si_code = sicode; \ | |
552 | info.si_addr = (void __user *)siaddr; \ | |
553 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
554 | == NOTIFY_STOP) \ | |
555 | return; \ | |
556 | do_trap(trapnr, signr, str, 0, regs, error_code, &info); \ | |
557 | } | |
558 | ||
559 | #define DO_VM86_ERROR(trapnr, signr, str, name) \ | |
75604d7f | 560 | void do_##name(struct pt_regs * regs, long error_code) \ |
1da177e4 LT |
561 | { \ |
562 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
563 | == NOTIFY_STOP) \ | |
564 | return; \ | |
565 | do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \ | |
566 | } | |
567 | ||
568 | #define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
75604d7f | 569 | void do_##name(struct pt_regs * regs, long error_code) \ |
1da177e4 LT |
570 | { \ |
571 | siginfo_t info; \ | |
572 | info.si_signo = signr; \ | |
573 | info.si_errno = 0; \ | |
574 | info.si_code = sicode; \ | |
575 | info.si_addr = (void __user *)siaddr; \ | |
fb1dac90 | 576 | trace_hardirqs_fixup(); \ |
1da177e4 LT |
577 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
578 | == NOTIFY_STOP) \ | |
579 | return; \ | |
580 | do_trap(trapnr, signr, str, 1, regs, error_code, &info); \ | |
581 | } | |
582 | ||
65ea5b03 | 583 | DO_VM86_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
1da177e4 LT |
584 | #ifndef CONFIG_KPROBES |
585 | DO_VM86_ERROR( 3, SIGTRAP, "int3", int3) | |
586 | #endif | |
587 | DO_VM86_ERROR( 4, SIGSEGV, "overflow", overflow) | |
588 | DO_VM86_ERROR( 5, SIGSEGV, "bounds", bounds) | |
65ea5b03 | 589 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0) |
1da177e4 LT |
590 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
591 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
592 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
593 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) | |
a10d9a71 PZ |
594 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0) |
595 | DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0, 1) | |
1da177e4 | 596 | |
75604d7f | 597 | void __kprobes do_general_protection(struct pt_regs * regs, |
3d97ae5b | 598 | long error_code) |
1da177e4 LT |
599 | { |
600 | int cpu = get_cpu(); | |
601 | struct tss_struct *tss = &per_cpu(init_tss, cpu); | |
602 | struct thread_struct *thread = ¤t->thread; | |
603 | ||
604 | /* | |
605 | * Perform the lazy TSS's I/O bitmap copy. If the TSS has an | |
606 | * invalid offset set (the LAZY one) and the faulting thread has | |
607 | * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS | |
608 | * and we set the offset field correctly. Then we let the CPU to | |
609 | * restart the faulting instruction. | |
610 | */ | |
a75c54f9 | 611 | if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY && |
1da177e4 LT |
612 | thread->io_bitmap_ptr) { |
613 | memcpy(tss->io_bitmap, thread->io_bitmap_ptr, | |
614 | thread->io_bitmap_max); | |
615 | /* | |
616 | * If the previously set map was extending to higher ports | |
617 | * than the current one, pad extra space with 0xff (no access). | |
618 | */ | |
619 | if (thread->io_bitmap_max < tss->io_bitmap_max) | |
620 | memset((char *) tss->io_bitmap + | |
621 | thread->io_bitmap_max, 0xff, | |
622 | tss->io_bitmap_max - thread->io_bitmap_max); | |
623 | tss->io_bitmap_max = thread->io_bitmap_max; | |
a75c54f9 | 624 | tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET; |
d5cd4aad | 625 | tss->io_bitmap_owner = thread; |
1da177e4 LT |
626 | put_cpu(); |
627 | return; | |
628 | } | |
629 | put_cpu(); | |
630 | ||
65ea5b03 | 631 | if (regs->flags & VM_MASK) |
1da177e4 LT |
632 | goto gp_in_vm86; |
633 | ||
717b594a | 634 | if (!user_mode(regs)) |
1da177e4 LT |
635 | goto gp_in_kernel; |
636 | ||
637 | current->thread.error_code = error_code; | |
638 | current->thread.trap_no = 13; | |
abd4f750 | 639 | if (show_unhandled_signals && unhandled_signal(current, SIGSEGV) && |
03252919 | 640 | printk_ratelimit()) { |
abd4f750 | 641 | printk(KERN_INFO |
03252919 | 642 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", |
19c5870c | 643 | current->comm, task_pid_nr(current), |
65ea5b03 | 644 | regs->ip, regs->sp, error_code); |
03252919 AK |
645 | print_vma_addr(" in ", regs->ip); |
646 | printk("\n"); | |
647 | } | |
abd4f750 | 648 | |
1da177e4 LT |
649 | force_sig(SIGSEGV, current); |
650 | return; | |
651 | ||
652 | gp_in_vm86: | |
653 | local_irq_enable(); | |
654 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); | |
655 | return; | |
656 | ||
657 | gp_in_kernel: | |
658 | if (!fixup_exception(regs)) { | |
d1895183 AK |
659 | current->thread.error_code = error_code; |
660 | current->thread.trap_no = 13; | |
1da177e4 LT |
661 | if (notify_die(DIE_GPF, "general protection fault", regs, |
662 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
663 | return; | |
664 | die("general protection fault", regs, error_code); | |
665 | } | |
666 | } | |
667 | ||