Commit | Line | Data |
---|---|---|
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 | */ | |
b5964405 IM |
12 | #include <linux/interrupt.h> |
13 | #include <linux/kallsyms.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/highmem.h> | |
16 | #include <linux/kprobes.h> | |
17 | #include <linux/uaccess.h> | |
18 | #include <linux/utsname.h> | |
19 | #include <linux/kdebug.h> | |
1da177e4 | 20 | #include <linux/kernel.h> |
b5964405 IM |
21 | #include <linux/module.h> |
22 | #include <linux/ptrace.h> | |
1da177e4 | 23 | #include <linux/string.h> |
b5964405 IM |
24 | #include <linux/unwind.h> |
25 | #include <linux/delay.h> | |
1da177e4 | 26 | #include <linux/errno.h> |
b5964405 IM |
27 | #include <linux/kexec.h> |
28 | #include <linux/sched.h> | |
1da177e4 | 29 | #include <linux/timer.h> |
1da177e4 | 30 | #include <linux/init.h> |
91768d6c | 31 | #include <linux/bug.h> |
b5964405 IM |
32 | #include <linux/nmi.h> |
33 | #include <linux/mm.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 | ||
b5964405 IM |
48 | #include <asm/arch_hooks.h> |
49 | #include <asm/stacktrace.h> | |
1da177e4 | 50 | #include <asm/processor.h> |
1da177e4 | 51 | #include <asm/debugreg.h> |
b5964405 IM |
52 | #include <asm/atomic.h> |
53 | #include <asm/system.h> | |
54 | #include <asm/unwind.h> | |
1da177e4 LT |
55 | #include <asm/desc.h> |
56 | #include <asm/i387.h> | |
57 | #include <asm/nmi.h> | |
1da177e4 | 58 | #include <asm/smp.h> |
b5964405 | 59 | #include <asm/io.h> |
1da177e4 LT |
60 | |
61 | #include "mach_traps.h" | |
62 | ||
29cbc78b AK |
63 | int panic_on_unrecovered_nmi; |
64 | ||
dbeb2be2 RR |
65 | DECLARE_BITMAP(used_vectors, NR_VECTORS); |
66 | EXPORT_SYMBOL_GPL(used_vectors); | |
67 | ||
1da177e4 LT |
68 | asmlinkage int system_call(void); |
69 | ||
1da177e4 | 70 | /* Do we ignore FPU interrupts ? */ |
b5964405 | 71 | char ignore_fpu_irq; |
1da177e4 LT |
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 | */ | |
010d4f82 | 78 | gate_desc idt_table[256] |
6842ef0e | 79 | __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, }; |
1da177e4 LT |
80 | |
81 | asmlinkage void divide_error(void); | |
82 | asmlinkage void debug(void); | |
83 | asmlinkage void nmi(void); | |
84 | asmlinkage void int3(void); | |
85 | asmlinkage void overflow(void); | |
86 | asmlinkage void bounds(void); | |
87 | asmlinkage void invalid_op(void); | |
88 | asmlinkage void device_not_available(void); | |
89 | asmlinkage void coprocessor_segment_overrun(void); | |
90 | asmlinkage void invalid_TSS(void); | |
91 | asmlinkage void segment_not_present(void); | |
92 | asmlinkage void stack_segment(void); | |
93 | asmlinkage void general_protection(void); | |
94 | asmlinkage void page_fault(void); | |
95 | asmlinkage void coprocessor_error(void); | |
96 | asmlinkage void simd_coprocessor_error(void); | |
97 | asmlinkage void alignment_check(void); | |
98 | asmlinkage void spurious_interrupt_bug(void); | |
99 | asmlinkage void machine_check(void); | |
100 | ||
0741f4d2 | 101 | int kstack_depth_to_print = 24; |
86c41837 | 102 | static unsigned int code_bytes = 64; |
e041c683 | 103 | |
a5ff677c HH |
104 | void printk_address(unsigned long address, int reliable) |
105 | { | |
106 | #ifdef CONFIG_KALLSYMS | |
b5964405 IM |
107 | char namebuf[KSYM_NAME_LEN]; |
108 | unsigned long offset = 0; | |
109 | unsigned long symsize; | |
a5ff677c | 110 | const char *symname; |
a5ff677c | 111 | char reliab[4] = ""; |
b5964405 IM |
112 | char *delim = ":"; |
113 | char *modname; | |
a5ff677c HH |
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 { | |
b5964405 IM |
141 | struct stack_frame *next_frame; |
142 | unsigned long return_address; | |
36ad4885 LT |
143 | }; |
144 | ||
b5964405 IM |
145 | static inline unsigned long |
146 | print_context_stack(struct thread_info *tinfo, | |
147 | unsigned long *stack, unsigned long bp, | |
148 | const struct stacktrace_ops *ops, void *data) | |
1da177e4 | 149 | { |
65ea5b03 | 150 | struct stack_frame *frame = (struct stack_frame *)bp; |
36ad4885 | 151 | |
36ad4885 LT |
152 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack))) { |
153 | unsigned long addr; | |
154 | ||
e9d4efdd AV |
155 | addr = *stack; |
156 | if (__kernel_text_address(addr)) { | |
157 | if ((unsigned long) stack == bp + 4) { | |
158 | ops->address(data, addr, 1); | |
159 | frame = frame->next_frame; | |
160 | bp = (unsigned long) frame; | |
161 | } else { | |
5bc27dc2 | 162 | ops->address(data, addr, bp == 0); |
e9d4efdd AV |
163 | } |
164 | } | |
165 | stack++; | |
1da177e4 | 166 | } |
65ea5b03 | 167 | return bp; |
1da177e4 LT |
168 | } |
169 | ||
b5964405 | 170 | #define MSG(msg) ops->warning(data, msg) |
b615ebda | 171 | |
2b14a78c | 172 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
5bc27dc2 | 173 | unsigned long *stack, unsigned long bp, |
9689ba8a | 174 | const struct stacktrace_ops *ops, void *data) |
1da177e4 | 175 | { |
1da177e4 LT |
176 | if (!task) |
177 | task = current; | |
178 | ||
a32cf397 | 179 | if (!stack) { |
2b14a78c | 180 | unsigned long dummy; |
b5964405 | 181 | |
2b14a78c | 182 | stack = &dummy; |
028a690a | 183 | if (task != current) |
faca6227 | 184 | stack = (unsigned long *)task->thread.sp; |
176a2718 JB |
185 | } |
186 | ||
a32cf397 | 187 | #ifdef CONFIG_FRAME_POINTER |
65ea5b03 | 188 | if (!bp) { |
a32cf397 | 189 | if (task == current) { |
65ea5b03 | 190 | /* Grab bp right from our regs */ |
b5964405 | 191 | asm("movl %%ebp, %0" : "=r" (bp) :); |
a32cf397 | 192 | } else { |
65ea5b03 | 193 | /* bp is the last reg pushed by switch_to */ |
faca6227 | 194 | bp = *(unsigned long *) task->thread.sp; |
a32cf397 | 195 | } |
1da177e4 | 196 | } |
a32cf397 | 197 | #endif |
1da177e4 LT |
198 | |
199 | while (1) { | |
200 | struct thread_info *context; | |
b5964405 | 201 | |
1da177e4 LT |
202 | context = (struct thread_info *) |
203 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
65ea5b03 | 204 | bp = print_context_stack(context, stack, bp, ops, data); |
b5964405 IM |
205 | /* |
206 | * Should be after the line below, but somewhere | |
207 | * in early boot context comes out corrupted and we | |
208 | * can't reference it: | |
209 | */ | |
2b14a78c AK |
210 | if (ops->stack(data, "IRQ") < 0) |
211 | break; | |
b5964405 | 212 | stack = (unsigned long *)context->previous_esp; |
1da177e4 LT |
213 | if (!stack) |
214 | break; | |
a36df98a | 215 | touch_nmi_watchdog(); |
1da177e4 LT |
216 | } |
217 | } | |
2b14a78c AK |
218 | EXPORT_SYMBOL(dump_trace); |
219 | ||
220 | static void | |
221 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
222 | { | |
223 | printk(data); | |
224 | print_symbol(msg, symbol); | |
225 | printk("\n"); | |
226 | } | |
227 | ||
228 | static void print_trace_warning(void *data, char *msg) | |
229 | { | |
230 | printk("%s%s\n", (char *)data, msg); | |
231 | } | |
232 | ||
233 | static int print_trace_stack(void *data, char *name) | |
234 | { | |
235 | return 0; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Print one address/symbol entries per line. | |
240 | */ | |
bc850d6b | 241 | static void print_trace_address(void *data, unsigned long addr, int reliable) |
2b14a78c AK |
242 | { |
243 | printk("%s [<%08lx>] ", (char *)data, addr); | |
bc850d6b AV |
244 | if (!reliable) |
245 | printk("? "); | |
2b14a78c | 246 | print_symbol("%s\n", addr); |
601e6255 | 247 | touch_nmi_watchdog(); |
2b14a78c AK |
248 | } |
249 | ||
9689ba8a | 250 | static const struct stacktrace_ops print_trace_ops = { |
b5964405 IM |
251 | .warning = print_trace_warning, |
252 | .warning_symbol = print_trace_warning_symbol, | |
253 | .stack = print_trace_stack, | |
254 | .address = print_trace_address, | |
2b14a78c AK |
255 | }; |
256 | ||
257 | static void | |
258 | show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
b5964405 | 259 | unsigned long *stack, unsigned long bp, char *log_lvl) |
2b14a78c | 260 | { |
5bc27dc2 | 261 | dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl); |
2b14a78c AK |
262 | printk("%s =======================\n", log_lvl); |
263 | } | |
1da177e4 | 264 | |
2b14a78c | 265 | void show_trace(struct task_struct *task, struct pt_regs *regs, |
5bc27dc2 | 266 | unsigned long *stack, unsigned long bp) |
7aa89746 | 267 | { |
5bc27dc2 | 268 | show_trace_log_lvl(task, regs, stack, bp, ""); |
7aa89746 CE |
269 | } |
270 | ||
b5964405 IM |
271 | static void |
272 | show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
273 | unsigned long *sp, unsigned long bp, char *log_lvl) | |
1da177e4 LT |
274 | { |
275 | unsigned long *stack; | |
276 | int i; | |
277 | ||
65ea5b03 | 278 | if (sp == NULL) { |
1da177e4 | 279 | if (task) |
b5964405 | 280 | sp = (unsigned long *)task->thread.sp; |
1da177e4 | 281 | else |
65ea5b03 | 282 | sp = (unsigned long *)&sp; |
1da177e4 LT |
283 | } |
284 | ||
65ea5b03 | 285 | stack = sp; |
b5964405 | 286 | for (i = 0; i < kstack_depth_to_print; i++) { |
1da177e4 LT |
287 | if (kstack_end(stack)) |
288 | break; | |
75874d5c CE |
289 | if (i && ((i % 8) == 0)) |
290 | printk("\n%s ", log_lvl); | |
1da177e4 LT |
291 | printk("%08lx ", *stack++); |
292 | } | |
75874d5c | 293 | printk("\n%sCall Trace:\n", log_lvl); |
b5964405 | 294 | |
5bc27dc2 | 295 | show_trace_log_lvl(task, regs, sp, bp, log_lvl); |
7aa89746 CE |
296 | } |
297 | ||
65ea5b03 | 298 | void show_stack(struct task_struct *task, unsigned long *sp) |
7aa89746 | 299 | { |
75874d5c | 300 | printk(" "); |
5bc27dc2 | 301 | show_stack_log_lvl(task, NULL, sp, 0, ""); |
1da177e4 LT |
302 | } |
303 | ||
304 | /* | |
305 | * The architecture-independent dump_stack generator | |
306 | */ | |
307 | void dump_stack(void) | |
308 | { | |
5bc27dc2 | 309 | unsigned long bp = 0; |
b5964405 | 310 | unsigned long stack; |
5bc27dc2 AV |
311 | |
312 | #ifdef CONFIG_FRAME_POINTER | |
313 | if (!bp) | |
314 | asm("movl %%ebp, %0" : "=r" (bp):); | |
315 | #endif | |
1da177e4 | 316 | |
57c351de AV |
317 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", |
318 | current->pid, current->comm, print_tainted(), | |
319 | init_utsname()->release, | |
320 | (int)strcspn(init_utsname()->version, " "), | |
321 | init_utsname()->version); | |
b5964405 | 322 | |
5bc27dc2 | 323 | show_trace(current, NULL, &stack, bp); |
1da177e4 LT |
324 | } |
325 | ||
326 | EXPORT_SYMBOL(dump_stack); | |
327 | ||
328 | void show_registers(struct pt_regs *regs) | |
329 | { | |
330 | int i; | |
9d975ebd | 331 | |
1da177e4 | 332 | print_modules(); |
9d975ebd | 333 | __show_registers(regs, 0); |
b5964405 | 334 | |
7e04a118 | 335 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)", |
19c5870c | 336 | TASK_COMM_LEN, current->comm, task_pid_nr(current), |
c9f4f06d | 337 | current_thread_info(), current, task_thread_info(current)); |
1da177e4 LT |
338 | /* |
339 | * When in-kernel, we also print out the stack and code at the | |
340 | * time of the fault.. | |
341 | */ | |
9d975ebd | 342 | if (!user_mode_vm(regs)) { |
86c41837 CE |
343 | unsigned int code_prologue = code_bytes * 43 / 64; |
344 | unsigned int code_len = code_bytes; | |
99325326 | 345 | unsigned char c; |
b5964405 | 346 | u8 *ip; |
1da177e4 | 347 | |
9c107805 | 348 | printk("\n" KERN_EMERG "Stack: "); |
5bc27dc2 | 349 | show_stack_log_lvl(NULL, regs, ®s->sp, 0, KERN_EMERG); |
1da177e4 | 350 | |
9c107805 | 351 | printk(KERN_EMERG "Code: "); |
1da177e4 | 352 | |
65ea5b03 PA |
353 | ip = (u8 *)regs->ip - code_prologue; |
354 | if (ip < (u8 *)PAGE_OFFSET || | |
355 | probe_kernel_address(ip, c)) { | |
99325326 | 356 | /* try starting at EIP */ |
65ea5b03 | 357 | ip = (u8 *)regs->ip; |
86c41837 | 358 | code_len = code_len - code_prologue + 1; |
99325326 | 359 | } |
65ea5b03 PA |
360 | for (i = 0; i < code_len; i++, ip++) { |
361 | if (ip < (u8 *)PAGE_OFFSET || | |
362 | probe_kernel_address(ip, c)) { | |
1da177e4 LT |
363 | printk(" Bad EIP value."); |
364 | break; | |
365 | } | |
65ea5b03 | 366 | if (ip == (u8 *)regs->ip) |
1da177e4 LT |
367 | printk("<%02x> ", c); |
368 | else | |
369 | printk("%02x ", c); | |
370 | } | |
371 | } | |
372 | printk("\n"); | |
b5964405 | 373 | } |
1da177e4 | 374 | |
65ea5b03 | 375 | int is_valid_bugaddr(unsigned long ip) |
1da177e4 LT |
376 | { |
377 | unsigned short ud2; | |
1da177e4 | 378 | |
65ea5b03 | 379 | if (ip < PAGE_OFFSET) |
91768d6c | 380 | return 0; |
65ea5b03 | 381 | if (probe_kernel_address((unsigned short *)ip, ud2)) |
91768d6c | 382 | return 0; |
1da177e4 | 383 | |
91768d6c | 384 | return ud2 == 0x0b0f; |
1da177e4 LT |
385 | } |
386 | ||
a604b380 HH |
387 | static int die_counter; |
388 | ||
b5964405 | 389 | int __kprobes __die(const char *str, struct pt_regs *regs, long err) |
a604b380 | 390 | { |
a604b380 | 391 | unsigned short ss; |
b5964405 | 392 | unsigned long sp; |
a604b380 HH |
393 | |
394 | printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter); | |
395 | #ifdef CONFIG_PREEMPT | |
396 | printk("PREEMPT "); | |
397 | #endif | |
398 | #ifdef CONFIG_SMP | |
399 | printk("SMP "); | |
400 | #endif | |
401 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
402 | printk("DEBUG_PAGEALLOC"); | |
403 | #endif | |
404 | printk("\n"); | |
405 | ||
406 | if (notify_die(DIE_OOPS, str, regs, err, | |
b5964405 IM |
407 | current->thread.trap_no, SIGSEGV) != NOTIFY_STOP) { |
408 | ||
a604b380 HH |
409 | show_registers(regs); |
410 | /* Executive summary in case the oops scrolled away */ | |
411 | sp = (unsigned long) (®s->sp); | |
412 | savesegment(ss, ss); | |
413 | if (user_mode(regs)) { | |
414 | sp = regs->sp; | |
415 | ss = regs->ss & 0xffff; | |
416 | } | |
417 | printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip); | |
418 | print_symbol("%s", regs->ip); | |
419 | printk(" SS:ESP %04x:%08lx\n", ss, sp); | |
b5964405 | 420 | |
a604b380 | 421 | return 0; |
a604b380 | 422 | } |
b5964405 IM |
423 | |
424 | return 1; | |
a604b380 HH |
425 | } |
426 | ||
91768d6c | 427 | /* |
b5964405 IM |
428 | * This is gone through when something in the kernel has done something bad |
429 | * and is about to be terminated: | |
91768d6c | 430 | */ |
b5964405 | 431 | void die(const char *str, struct pt_regs *regs, long err) |
1da177e4 LT |
432 | { |
433 | static struct { | |
39743c9e | 434 | raw_spinlock_t lock; |
1da177e4 LT |
435 | u32 lock_owner; |
436 | int lock_owner_depth; | |
437 | } die = { | |
39743c9e | 438 | .lock = __RAW_SPIN_LOCK_UNLOCKED, |
1da177e4 LT |
439 | .lock_owner = -1, |
440 | .lock_owner_depth = 0 | |
441 | }; | |
e43d674f | 442 | unsigned long flags; |
1da177e4 | 443 | |
dd287796 AM |
444 | oops_enter(); |
445 | ||
39c715b7 | 446 | if (die.lock_owner != raw_smp_processor_id()) { |
1da177e4 | 447 | console_verbose(); |
c0a698b7 | 448 | raw_local_irq_save(flags); |
39743c9e | 449 | __raw_spin_lock(&die.lock); |
1da177e4 LT |
450 | die.lock_owner = smp_processor_id(); |
451 | die.lock_owner_depth = 0; | |
452 | bust_spinlocks(1); | |
b5964405 | 453 | } else { |
c0a698b7 | 454 | raw_local_irq_save(flags); |
b5964405 | 455 | } |
1da177e4 LT |
456 | |
457 | if (++die.lock_owner_depth < 3) { | |
65ea5b03 | 458 | report_bug(regs->ip, regs); |
91768d6c | 459 | |
a604b380 | 460 | if (__die(str, regs, err)) |
20c0d2d4 | 461 | regs = NULL; |
a604b380 | 462 | } else { |
9c107805 | 463 | printk(KERN_EMERG "Recursive die() failure, output suppressed\n"); |
a604b380 | 464 | } |
1da177e4 LT |
465 | |
466 | bust_spinlocks(0); | |
467 | die.lock_owner = -1; | |
bcdcd8e7 | 468 | add_taint(TAINT_DIE); |
39743c9e AK |
469 | __raw_spin_unlock(&die.lock); |
470 | raw_local_irq_restore(flags); | |
6e274d14 | 471 | |
20c0d2d4 JB |
472 | if (!regs) |
473 | return; | |
474 | ||
6e274d14 AN |
475 | if (kexec_should_crash(current)) |
476 | crash_kexec(regs); | |
477 | ||
1da177e4 LT |
478 | if (in_interrupt()) |
479 | panic("Fatal exception in interrupt"); | |
480 | ||
cea6a4ba | 481 | if (panic_on_oops) |
012c437d | 482 | panic("Fatal exception"); |
cea6a4ba | 483 | |
dd287796 | 484 | oops_exit(); |
1da177e4 LT |
485 | do_exit(SIGSEGV); |
486 | } | |
487 | ||
b5964405 IM |
488 | static inline void |
489 | die_if_kernel(const char *str, struct pt_regs *regs, long err) | |
1da177e4 | 490 | { |
717b594a | 491 | if (!user_mode_vm(regs)) |
1da177e4 LT |
492 | die(str, regs, err); |
493 | } | |
494 | ||
b5964405 IM |
495 | static void __kprobes |
496 | do_trap(int trapnr, int signr, char *str, int vm86, struct pt_regs *regs, | |
497 | long error_code, siginfo_t *info) | |
1da177e4 | 498 | { |
4f339ecb | 499 | struct task_struct *tsk = current; |
4f339ecb | 500 | |
6b6891f9 | 501 | if (regs->flags & X86_VM_MASK) { |
1da177e4 LT |
502 | if (vm86) |
503 | goto vm86_trap; | |
504 | goto trap_signal; | |
505 | } | |
506 | ||
717b594a | 507 | if (!user_mode(regs)) |
1da177e4 LT |
508 | goto kernel_trap; |
509 | ||
b5964405 IM |
510 | trap_signal: |
511 | /* | |
512 | * We want error_code and trap_no set for userspace faults and | |
513 | * kernelspace faults which result in die(), but not | |
514 | * kernelspace faults which are fixed up. die() gives the | |
515 | * process no chance to handle the signal and notice the | |
516 | * kernel fault information, so that won't result in polluting | |
517 | * the information about previously queued, but not yet | |
518 | * delivered, faults. See also do_general_protection below. | |
519 | */ | |
520 | tsk->thread.error_code = error_code; | |
521 | tsk->thread.trap_no = trapnr; | |
d1895183 | 522 | |
b5964405 IM |
523 | if (info) |
524 | force_sig_info(signr, info, tsk); | |
525 | else | |
526 | force_sig(signr, tsk); | |
527 | return; | |
1da177e4 | 528 | |
b5964405 IM |
529 | kernel_trap: |
530 | if (!fixup_exception(regs)) { | |
531 | tsk->thread.error_code = error_code; | |
532 | tsk->thread.trap_no = trapnr; | |
533 | die(str, regs, error_code); | |
1da177e4 | 534 | } |
b5964405 | 535 | return; |
1da177e4 | 536 | |
b5964405 IM |
537 | vm86_trap: |
538 | if (handle_vm86_trap((struct kernel_vm86_regs *) regs, | |
539 | error_code, trapnr)) | |
540 | goto trap_signal; | |
541 | return; | |
1da177e4 LT |
542 | } |
543 | ||
b5964405 IM |
544 | #define DO_ERROR(trapnr, signr, str, name) \ |
545 | void do_##name(struct pt_regs *regs, long error_code) \ | |
546 | { \ | |
547 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
548 | == NOTIFY_STOP) \ | |
549 | return; \ | |
550 | do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \ | |
1da177e4 LT |
551 | } |
552 | ||
b5964405 IM |
553 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr, irq) \ |
554 | void do_##name(struct pt_regs *regs, long error_code) \ | |
555 | { \ | |
556 | siginfo_t info; \ | |
557 | if (irq) \ | |
558 | local_irq_enable(); \ | |
559 | info.si_signo = signr; \ | |
560 | info.si_errno = 0; \ | |
561 | info.si_code = sicode; \ | |
562 | info.si_addr = (void __user *)siaddr; \ | |
563 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
564 | == NOTIFY_STOP) \ | |
565 | return; \ | |
566 | do_trap(trapnr, signr, str, 0, regs, error_code, &info); \ | |
1da177e4 LT |
567 | } |
568 | ||
b5964405 IM |
569 | #define DO_VM86_ERROR(trapnr, signr, str, name) \ |
570 | void do_##name(struct pt_regs *regs, long error_code) \ | |
571 | { \ | |
572 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
573 | == NOTIFY_STOP) \ | |
574 | return; \ | |
575 | do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \ | |
1da177e4 LT |
576 | } |
577 | ||
b5964405 IM |
578 | #define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
579 | void do_##name(struct pt_regs *regs, long error_code) \ | |
580 | { \ | |
581 | siginfo_t info; \ | |
582 | info.si_signo = signr; \ | |
583 | info.si_errno = 0; \ | |
584 | info.si_code = sicode; \ | |
585 | info.si_addr = (void __user *)siaddr; \ | |
586 | trace_hardirqs_fixup(); \ | |
587 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
588 | == NOTIFY_STOP) \ | |
589 | return; \ | |
590 | do_trap(trapnr, signr, str, 1, regs, error_code, &info); \ | |
1da177e4 LT |
591 | } |
592 | ||
b5964405 | 593 | DO_VM86_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
1da177e4 | 594 | #ifndef CONFIG_KPROBES |
b5964405 | 595 | DO_VM86_ERROR(3, SIGTRAP, "int3", int3) |
1da177e4 | 596 | #endif |
b5964405 IM |
597 | DO_VM86_ERROR(4, SIGSEGV, "overflow", overflow) |
598 | DO_VM86_ERROR(5, SIGSEGV, "bounds", bounds) | |
599 | DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0) | |
600 | DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
1da177e4 LT |
601 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) |
602 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
603 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) | |
a10d9a71 PZ |
604 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0) |
605 | DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0, 1) | |
1da177e4 | 606 | |
b5964405 | 607 | void __kprobes do_general_protection(struct pt_regs *regs, long error_code) |
1da177e4 | 608 | { |
b5964405 IM |
609 | struct thread_struct *thread; |
610 | struct tss_struct *tss; | |
611 | int cpu; | |
612 | ||
613 | cpu = get_cpu(); | |
614 | tss = &per_cpu(init_tss, cpu); | |
615 | thread = ¤t->thread; | |
1da177e4 LT |
616 | |
617 | /* | |
618 | * Perform the lazy TSS's I/O bitmap copy. If the TSS has an | |
619 | * invalid offset set (the LAZY one) and the faulting thread has | |
620 | * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS | |
621 | * and we set the offset field correctly. Then we let the CPU to | |
622 | * restart the faulting instruction. | |
623 | */ | |
a75c54f9 | 624 | if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY && |
1da177e4 LT |
625 | thread->io_bitmap_ptr) { |
626 | memcpy(tss->io_bitmap, thread->io_bitmap_ptr, | |
627 | thread->io_bitmap_max); | |
628 | /* | |
629 | * If the previously set map was extending to higher ports | |
630 | * than the current one, pad extra space with 0xff (no access). | |
631 | */ | |
b5964405 | 632 | if (thread->io_bitmap_max < tss->io_bitmap_max) { |
1da177e4 LT |
633 | memset((char *) tss->io_bitmap + |
634 | thread->io_bitmap_max, 0xff, | |
635 | tss->io_bitmap_max - thread->io_bitmap_max); | |
b5964405 | 636 | } |
1da177e4 | 637 | tss->io_bitmap_max = thread->io_bitmap_max; |
a75c54f9 | 638 | tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET; |
d5cd4aad | 639 | tss->io_bitmap_owner = thread; |
1da177e4 | 640 | put_cpu(); |
b5964405 | 641 | |
1da177e4 LT |
642 | return; |
643 | } | |
644 | put_cpu(); | |
645 | ||
6b6891f9 | 646 | if (regs->flags & X86_VM_MASK) |
1da177e4 LT |
647 | goto gp_in_vm86; |
648 | ||
717b594a | 649 | if (!user_mode(regs)) |
1da177e4 LT |
650 | goto gp_in_kernel; |
651 | ||
652 | current->thread.error_code = error_code; | |
653 | current->thread.trap_no = 13; | |
b5964405 | 654 | |
abd4f750 | 655 | if (show_unhandled_signals && unhandled_signal(current, SIGSEGV) && |
03252919 | 656 | printk_ratelimit()) { |
abd4f750 | 657 | printk(KERN_INFO |
03252919 | 658 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", |
19c5870c | 659 | current->comm, task_pid_nr(current), |
65ea5b03 | 660 | regs->ip, regs->sp, error_code); |
03252919 AK |
661 | print_vma_addr(" in ", regs->ip); |
662 | printk("\n"); | |
663 | } | |
abd4f750 | 664 | |
1da177e4 LT |
665 | force_sig(SIGSEGV, current); |
666 | return; | |
667 | ||
668 | gp_in_vm86: | |
669 | local_irq_enable(); | |
670 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); | |
671 | return; | |
672 | ||
673 | gp_in_kernel: | |
674 | if (!fixup_exception(regs)) { | |
d1895183 AK |
675 | current->thread.error_code = error_code; |
676 | current->thread.trap_no = 13; | |
1da177e4 LT |
677 | if (notify_die(DIE_GPF, "general protection fault", regs, |
678 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
679 | return; | |
680 | die("general protection fault", regs, error_code); | |
681 | } | |
682 | } | |
683 | ||