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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
a8c1be9d | 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
1da177e4 LT |
4 | * |
5 | * Pentium III FXSR, SSE support | |
6 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
7 | */ | |
8 | ||
9 | /* | |
10 | * 'Traps.c' handles hardware traps and faults after we have saved some | |
11 | * state in 'asm.s'. | |
12 | */ | |
b5964405 IM |
13 | #include <linux/interrupt.h> |
14 | #include <linux/kallsyms.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/highmem.h> | |
17 | #include <linux/kprobes.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/utsname.h> | |
20 | #include <linux/kdebug.h> | |
1da177e4 | 21 | #include <linux/kernel.h> |
b5964405 IM |
22 | #include <linux/module.h> |
23 | #include <linux/ptrace.h> | |
1da177e4 | 24 | #include <linux/string.h> |
b5964405 IM |
25 | #include <linux/unwind.h> |
26 | #include <linux/delay.h> | |
1da177e4 | 27 | #include <linux/errno.h> |
b5964405 IM |
28 | #include <linux/kexec.h> |
29 | #include <linux/sched.h> | |
1da177e4 | 30 | #include <linux/timer.h> |
1da177e4 | 31 | #include <linux/init.h> |
91768d6c | 32 | #include <linux/bug.h> |
b5964405 IM |
33 | #include <linux/nmi.h> |
34 | #include <linux/mm.h> | |
1da177e4 LT |
35 | |
36 | #ifdef CONFIG_EISA | |
37 | #include <linux/ioport.h> | |
38 | #include <linux/eisa.h> | |
39 | #endif | |
40 | ||
41 | #ifdef CONFIG_MCA | |
42 | #include <linux/mca.h> | |
43 | #endif | |
44 | ||
c0d12172 DJ |
45 | #if defined(CONFIG_EDAC) |
46 | #include <linux/edac.h> | |
47 | #endif | |
48 | ||
b5964405 IM |
49 | #include <asm/arch_hooks.h> |
50 | #include <asm/stacktrace.h> | |
1da177e4 | 51 | #include <asm/processor.h> |
1da177e4 | 52 | #include <asm/debugreg.h> |
b5964405 IM |
53 | #include <asm/atomic.h> |
54 | #include <asm/system.h> | |
55 | #include <asm/unwind.h> | |
1da177e4 LT |
56 | #include <asm/desc.h> |
57 | #include <asm/i387.h> | |
58 | #include <asm/nmi.h> | |
1da177e4 | 59 | #include <asm/smp.h> |
b5964405 | 60 | #include <asm/io.h> |
6ac8d51f | 61 | #include <asm/traps.h> |
1da177e4 LT |
62 | |
63 | #include "mach_traps.h" | |
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 | 80 | |
badc7652 | 81 | int panic_on_unrecovered_nmi; |
0741f4d2 | 82 | int kstack_depth_to_print = 24; |
86c41837 | 83 | static unsigned int code_bytes = 64; |
badc7652 AH |
84 | static int ignore_nmis; |
85 | static int die_counter; | |
e041c683 | 86 | |
a5ff677c HH |
87 | void printk_address(unsigned long address, int reliable) |
88 | { | |
89 | #ifdef CONFIG_KALLSYMS | |
b5964405 IM |
90 | unsigned long offset = 0; |
91 | unsigned long symsize; | |
a5ff677c | 92 | const char *symname; |
b5964405 | 93 | char *modname; |
7b4fd4bb AH |
94 | char *delim = ":"; |
95 | char namebuf[KSYM_NAME_LEN]; | |
96 | char reliab[4] = ""; | |
a5ff677c HH |
97 | |
98 | symname = kallsyms_lookup(address, &symsize, &offset, | |
99 | &modname, namebuf); | |
100 | if (!symname) { | |
101 | printk(" [<%08lx>]\n", address); | |
102 | return; | |
103 | } | |
104 | if (!reliable) | |
105 | strcpy(reliab, "? "); | |
106 | ||
107 | if (!modname) | |
108 | modname = delim = ""; | |
109 | printk(" [<%08lx>] %s%s%s%s%s+0x%lx/0x%lx\n", | |
110 | address, reliab, delim, modname, delim, symname, offset, symsize); | |
111 | #else | |
112 | printk(" [<%08lx>]\n", address); | |
113 | #endif | |
114 | } | |
115 | ||
a8c1be9d AH |
116 | static inline int valid_stack_ptr(struct thread_info *tinfo, |
117 | void *p, unsigned int size) | |
1da177e4 | 118 | { |
7b4fd4bb AH |
119 | void *t = tinfo; |
120 | return p > t && p <= t + THREAD_SIZE - size; | |
1da177e4 LT |
121 | } |
122 | ||
36ad4885 LT |
123 | /* The form of the top of the frame on the stack */ |
124 | struct stack_frame { | |
a8c1be9d AH |
125 | struct stack_frame *next_frame; |
126 | unsigned long return_address; | |
36ad4885 LT |
127 | }; |
128 | ||
b5964405 IM |
129 | static inline unsigned long |
130 | print_context_stack(struct thread_info *tinfo, | |
a8c1be9d AH |
131 | unsigned long *stack, unsigned long bp, |
132 | const struct stacktrace_ops *ops, void *data) | |
1da177e4 | 133 | { |
65ea5b03 | 134 | struct stack_frame *frame = (struct stack_frame *)bp; |
36ad4885 | 135 | |
36ad4885 LT |
136 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack))) { |
137 | unsigned long addr; | |
138 | ||
e9d4efdd AV |
139 | addr = *stack; |
140 | if (__kernel_text_address(addr)) { | |
141 | if ((unsigned long) stack == bp + 4) { | |
142 | ops->address(data, addr, 1); | |
143 | frame = frame->next_frame; | |
144 | bp = (unsigned long) frame; | |
145 | } else { | |
5bc27dc2 | 146 | ops->address(data, addr, bp == 0); |
e9d4efdd AV |
147 | } |
148 | } | |
149 | stack++; | |
1da177e4 | 150 | } |
65ea5b03 | 151 | return bp; |
1da177e4 LT |
152 | } |
153 | ||
2b14a78c | 154 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
5bc27dc2 | 155 | unsigned long *stack, unsigned long bp, |
9689ba8a | 156 | const struct stacktrace_ops *ops, void *data) |
1da177e4 | 157 | { |
1da177e4 LT |
158 | if (!task) |
159 | task = current; | |
160 | ||
a32cf397 | 161 | if (!stack) { |
2b14a78c AK |
162 | unsigned long dummy; |
163 | stack = &dummy; | |
028a690a | 164 | if (task != current) |
faca6227 | 165 | stack = (unsigned long *)task->thread.sp; |
176a2718 JB |
166 | } |
167 | ||
a32cf397 | 168 | #ifdef CONFIG_FRAME_POINTER |
65ea5b03 | 169 | if (!bp) { |
a32cf397 | 170 | if (task == current) { |
65ea5b03 | 171 | /* Grab bp right from our regs */ |
b5964405 | 172 | asm("movl %%ebp, %0" : "=r" (bp) :); |
a32cf397 | 173 | } else { |
65ea5b03 | 174 | /* bp is the last reg pushed by switch_to */ |
faca6227 | 175 | bp = *(unsigned long *) task->thread.sp; |
a32cf397 | 176 | } |
1da177e4 | 177 | } |
a32cf397 | 178 | #endif |
1da177e4 | 179 | |
a8c1be9d | 180 | for (;;) { |
1da177e4 | 181 | struct thread_info *context; |
b5964405 | 182 | |
1da177e4 LT |
183 | context = (struct thread_info *) |
184 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
65ea5b03 | 185 | bp = print_context_stack(context, stack, bp, ops, data); |
b5964405 IM |
186 | /* |
187 | * Should be after the line below, but somewhere | |
188 | * in early boot context comes out corrupted and we | |
189 | * can't reference it: | |
190 | */ | |
2b14a78c AK |
191 | if (ops->stack(data, "IRQ") < 0) |
192 | break; | |
b5964405 | 193 | stack = (unsigned long *)context->previous_esp; |
1da177e4 LT |
194 | if (!stack) |
195 | break; | |
a36df98a | 196 | touch_nmi_watchdog(); |
1da177e4 LT |
197 | } |
198 | } | |
2b14a78c AK |
199 | EXPORT_SYMBOL(dump_trace); |
200 | ||
201 | static void | |
202 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
203 | { | |
204 | printk(data); | |
205 | print_symbol(msg, symbol); | |
206 | printk("\n"); | |
207 | } | |
208 | ||
209 | static void print_trace_warning(void *data, char *msg) | |
210 | { | |
211 | printk("%s%s\n", (char *)data, msg); | |
212 | } | |
213 | ||
214 | static int print_trace_stack(void *data, char *name) | |
215 | { | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Print one address/symbol entries per line. | |
221 | */ | |
bc850d6b | 222 | static void print_trace_address(void *data, unsigned long addr, int reliable) |
2b14a78c AK |
223 | { |
224 | printk("%s [<%08lx>] ", (char *)data, addr); | |
bc850d6b AV |
225 | if (!reliable) |
226 | printk("? "); | |
2b14a78c | 227 | print_symbol("%s\n", addr); |
601e6255 | 228 | touch_nmi_watchdog(); |
2b14a78c AK |
229 | } |
230 | ||
9689ba8a | 231 | static const struct stacktrace_ops print_trace_ops = { |
a8c1be9d AH |
232 | .warning = print_trace_warning, |
233 | .warning_symbol = print_trace_warning_symbol, | |
234 | .stack = print_trace_stack, | |
235 | .address = print_trace_address, | |
2b14a78c AK |
236 | }; |
237 | ||
238 | static void | |
239 | show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
7dedcee3 | 240 | unsigned long *stack, unsigned long bp, char *log_lvl) |
2b14a78c | 241 | { |
5bc27dc2 | 242 | dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl); |
2b14a78c AK |
243 | printk("%s =======================\n", log_lvl); |
244 | } | |
1da177e4 | 245 | |
2b14a78c | 246 | void show_trace(struct task_struct *task, struct pt_regs *regs, |
5bc27dc2 | 247 | unsigned long *stack, unsigned long bp) |
7aa89746 | 248 | { |
5bc27dc2 | 249 | show_trace_log_lvl(task, regs, stack, bp, ""); |
7aa89746 CE |
250 | } |
251 | ||
b5964405 IM |
252 | static void |
253 | show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
254 | unsigned long *sp, unsigned long bp, char *log_lvl) | |
1da177e4 LT |
255 | { |
256 | unsigned long *stack; | |
257 | int i; | |
258 | ||
65ea5b03 | 259 | if (sp == NULL) { |
1da177e4 | 260 | if (task) |
b5964405 | 261 | sp = (unsigned long *)task->thread.sp; |
1da177e4 | 262 | else |
65ea5b03 | 263 | sp = (unsigned long *)&sp; |
1da177e4 LT |
264 | } |
265 | ||
65ea5b03 | 266 | stack = sp; |
b5964405 | 267 | for (i = 0; i < kstack_depth_to_print; i++) { |
1da177e4 LT |
268 | if (kstack_end(stack)) |
269 | break; | |
75874d5c CE |
270 | if (i && ((i % 8) == 0)) |
271 | printk("\n%s ", log_lvl); | |
1da177e4 LT |
272 | printk("%08lx ", *stack++); |
273 | } | |
75874d5c | 274 | printk("\n%sCall Trace:\n", log_lvl); |
b5964405 | 275 | |
5bc27dc2 | 276 | show_trace_log_lvl(task, regs, sp, bp, log_lvl); |
7aa89746 CE |
277 | } |
278 | ||
65ea5b03 | 279 | void show_stack(struct task_struct *task, unsigned long *sp) |
7aa89746 | 280 | { |
75874d5c | 281 | printk(" "); |
5bc27dc2 | 282 | show_stack_log_lvl(task, NULL, sp, 0, ""); |
1da177e4 LT |
283 | } |
284 | ||
285 | /* | |
286 | * The architecture-independent dump_stack generator | |
287 | */ | |
288 | void dump_stack(void) | |
289 | { | |
5bc27dc2 | 290 | unsigned long bp = 0; |
b5964405 | 291 | unsigned long stack; |
5bc27dc2 AV |
292 | |
293 | #ifdef CONFIG_FRAME_POINTER | |
294 | if (!bp) | |
295 | asm("movl %%ebp, %0" : "=r" (bp):); | |
296 | #endif | |
1da177e4 | 297 | |
57c351de AV |
298 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", |
299 | current->pid, current->comm, print_tainted(), | |
300 | init_utsname()->release, | |
301 | (int)strcspn(init_utsname()->version, " "), | |
302 | init_utsname()->version); | |
b5964405 | 303 | |
5bc27dc2 | 304 | show_trace(current, NULL, &stack, bp); |
1da177e4 LT |
305 | } |
306 | ||
307 | EXPORT_SYMBOL(dump_stack); | |
308 | ||
309 | void show_registers(struct pt_regs *regs) | |
310 | { | |
311 | int i; | |
9d975ebd | 312 | |
1da177e4 | 313 | print_modules(); |
9d975ebd | 314 | __show_registers(regs, 0); |
b5964405 | 315 | |
7e04a118 | 316 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)", |
19c5870c | 317 | TASK_COMM_LEN, current->comm, task_pid_nr(current), |
c9f4f06d | 318 | current_thread_info(), current, task_thread_info(current)); |
1da177e4 LT |
319 | /* |
320 | * When in-kernel, we also print out the stack and code at the | |
321 | * time of the fault.. | |
322 | */ | |
9d975ebd | 323 | if (!user_mode_vm(regs)) { |
86c41837 CE |
324 | unsigned int code_prologue = code_bytes * 43 / 64; |
325 | unsigned int code_len = code_bytes; | |
99325326 | 326 | unsigned char c; |
b5964405 | 327 | u8 *ip; |
1da177e4 | 328 | |
9c107805 | 329 | printk("\n" KERN_EMERG "Stack: "); |
5bc27dc2 | 330 | show_stack_log_lvl(NULL, regs, ®s->sp, 0, KERN_EMERG); |
1da177e4 | 331 | |
9c107805 | 332 | printk(KERN_EMERG "Code: "); |
1da177e4 | 333 | |
65ea5b03 | 334 | ip = (u8 *)regs->ip - code_prologue; |
a8c1be9d | 335 | if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { |
99325326 | 336 | /* try starting at EIP */ |
65ea5b03 | 337 | ip = (u8 *)regs->ip; |
86c41837 | 338 | code_len = code_len - code_prologue + 1; |
99325326 | 339 | } |
65ea5b03 PA |
340 | for (i = 0; i < code_len; i++, ip++) { |
341 | if (ip < (u8 *)PAGE_OFFSET || | |
a8c1be9d | 342 | probe_kernel_address(ip, c)) { |
1da177e4 LT |
343 | printk(" Bad EIP value."); |
344 | break; | |
345 | } | |
65ea5b03 | 346 | if (ip == (u8 *)regs->ip) |
1da177e4 LT |
347 | printk("<%02x> ", c); |
348 | else | |
349 | printk("%02x ", c); | |
350 | } | |
351 | } | |
352 | printk("\n"); | |
b5964405 | 353 | } |
1da177e4 | 354 | |
65ea5b03 | 355 | int is_valid_bugaddr(unsigned long ip) |
1da177e4 LT |
356 | { |
357 | unsigned short ud2; | |
1da177e4 | 358 | |
65ea5b03 | 359 | if (ip < PAGE_OFFSET) |
91768d6c | 360 | return 0; |
65ea5b03 | 361 | if (probe_kernel_address((unsigned short *)ip, ud2)) |
91768d6c | 362 | return 0; |
1da177e4 | 363 | |
91768d6c | 364 | return ud2 == 0x0b0f; |
1da177e4 LT |
365 | } |
366 | ||
78cbac65 AH |
367 | static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; |
368 | static int die_owner = -1; | |
369 | static unsigned int die_nest_count; | |
370 | ||
371 | unsigned __kprobes long oops_begin(void) | |
372 | { | |
373 | unsigned long flags; | |
374 | ||
375 | oops_enter(); | |
376 | ||
377 | if (die_owner != raw_smp_processor_id()) { | |
378 | console_verbose(); | |
379 | raw_local_irq_save(flags); | |
380 | __raw_spin_lock(&die_lock); | |
381 | die_owner = smp_processor_id(); | |
382 | die_nest_count = 0; | |
383 | bust_spinlocks(1); | |
384 | } else { | |
385 | raw_local_irq_save(flags); | |
386 | } | |
387 | die_nest_count++; | |
388 | return flags; | |
389 | } | |
390 | ||
391 | void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr) | |
392 | { | |
393 | bust_spinlocks(0); | |
394 | die_owner = -1; | |
395 | add_taint(TAINT_DIE); | |
396 | __raw_spin_unlock(&die_lock); | |
397 | raw_local_irq_restore(flags); | |
398 | ||
399 | if (!regs) | |
400 | return; | |
401 | ||
402 | if (kexec_should_crash(current)) | |
403 | crash_kexec(regs); | |
404 | ||
405 | if (in_interrupt()) | |
406 | panic("Fatal exception in interrupt"); | |
407 | ||
408 | if (panic_on_oops) | |
409 | panic("Fatal exception"); | |
410 | ||
411 | oops_exit(); | |
412 | do_exit(signr); | |
413 | } | |
414 | ||
b5964405 | 415 | int __kprobes __die(const char *str, struct pt_regs *regs, long err) |
a604b380 | 416 | { |
a604b380 | 417 | unsigned short ss; |
b5964405 | 418 | unsigned long sp; |
a604b380 HH |
419 | |
420 | printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter); | |
421 | #ifdef CONFIG_PREEMPT | |
422 | printk("PREEMPT "); | |
423 | #endif | |
424 | #ifdef CONFIG_SMP | |
425 | printk("SMP "); | |
426 | #endif | |
427 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
428 | printk("DEBUG_PAGEALLOC"); | |
429 | #endif | |
430 | printk("\n"); | |
a604b380 | 431 | if (notify_die(DIE_OOPS, str, regs, err, |
e423f49f AH |
432 | current->thread.trap_no, SIGSEGV) == NOTIFY_STOP) |
433 | return 1; | |
434 | ||
435 | show_registers(regs); | |
436 | /* Executive summary in case the oops scrolled away */ | |
437 | sp = (unsigned long) (®s->sp); | |
438 | savesegment(ss, ss); | |
439 | if (user_mode(regs)) { | |
440 | sp = regs->sp; | |
441 | ss = regs->ss & 0xffff; | |
a604b380 | 442 | } |
e423f49f AH |
443 | printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip); |
444 | print_symbol("%s", regs->ip); | |
445 | printk(" SS:ESP %04x:%08lx\n", ss, sp); | |
446 | return 0; | |
a604b380 HH |
447 | } |
448 | ||
91768d6c | 449 | /* |
b5964405 IM |
450 | * This is gone through when something in the kernel has done something bad |
451 | * and is about to be terminated: | |
91768d6c | 452 | */ |
b5964405 | 453 | void die(const char *str, struct pt_regs *regs, long err) |
1da177e4 | 454 | { |
78cbac65 | 455 | unsigned long flags = oops_begin(); |
1da177e4 | 456 | |
78cbac65 | 457 | if (die_nest_count < 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 | 465 | |
78cbac65 | 466 | oops_end(flags, regs, SIGSEGV); |
1da177e4 LT |
467 | } |
468 | ||
b5964405 IM |
469 | static inline void |
470 | die_if_kernel(const char *str, struct pt_regs *regs, long err) | |
1da177e4 | 471 | { |
717b594a | 472 | if (!user_mode_vm(regs)) |
1da177e4 LT |
473 | die(str, regs, err); |
474 | } | |
475 | ||
b5964405 IM |
476 | static void __kprobes |
477 | do_trap(int trapnr, int signr, char *str, int vm86, struct pt_regs *regs, | |
478 | long error_code, siginfo_t *info) | |
1da177e4 | 479 | { |
4f339ecb | 480 | struct task_struct *tsk = current; |
4f339ecb | 481 | |
6b6891f9 | 482 | if (regs->flags & X86_VM_MASK) { |
1da177e4 LT |
483 | if (vm86) |
484 | goto vm86_trap; | |
485 | goto trap_signal; | |
486 | } | |
487 | ||
717b594a | 488 | if (!user_mode(regs)) |
1da177e4 LT |
489 | goto kernel_trap; |
490 | ||
b5964405 IM |
491 | trap_signal: |
492 | /* | |
493 | * We want error_code and trap_no set for userspace faults and | |
494 | * kernelspace faults which result in die(), but not | |
495 | * kernelspace faults which are fixed up. die() gives the | |
496 | * process no chance to handle the signal and notice the | |
497 | * kernel fault information, so that won't result in polluting | |
498 | * the information about previously queued, but not yet | |
499 | * delivered, faults. See also do_general_protection below. | |
500 | */ | |
501 | tsk->thread.error_code = error_code; | |
502 | tsk->thread.trap_no = trapnr; | |
d1895183 | 503 | |
b5964405 IM |
504 | if (info) |
505 | force_sig_info(signr, info, tsk); | |
506 | else | |
507 | force_sig(signr, tsk); | |
508 | return; | |
1da177e4 | 509 | |
b5964405 IM |
510 | kernel_trap: |
511 | if (!fixup_exception(regs)) { | |
512 | tsk->thread.error_code = error_code; | |
513 | tsk->thread.trap_no = trapnr; | |
514 | die(str, regs, error_code); | |
1da177e4 | 515 | } |
b5964405 | 516 | return; |
1da177e4 | 517 | |
b5964405 IM |
518 | vm86_trap: |
519 | if (handle_vm86_trap((struct kernel_vm86_regs *) regs, | |
520 | error_code, trapnr)) | |
521 | goto trap_signal; | |
522 | return; | |
1da177e4 LT |
523 | } |
524 | ||
b5964405 IM |
525 | #define DO_ERROR(trapnr, signr, str, name) \ |
526 | void do_##name(struct pt_regs *regs, long error_code) \ | |
527 | { \ | |
4461145e | 528 | trace_hardirqs_fixup(); \ |
b5964405 | 529 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
a8c1be9d | 530 | == NOTIFY_STOP) \ |
b5964405 IM |
531 | return; \ |
532 | do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \ | |
1da177e4 LT |
533 | } |
534 | ||
b5964405 IM |
535 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr, irq) \ |
536 | void do_##name(struct pt_regs *regs, long error_code) \ | |
537 | { \ | |
538 | siginfo_t info; \ | |
539 | if (irq) \ | |
540 | local_irq_enable(); \ | |
541 | info.si_signo = signr; \ | |
542 | info.si_errno = 0; \ | |
543 | info.si_code = sicode; \ | |
544 | info.si_addr = (void __user *)siaddr; \ | |
545 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
a8c1be9d | 546 | == NOTIFY_STOP) \ |
b5964405 IM |
547 | return; \ |
548 | do_trap(trapnr, signr, str, 0, regs, error_code, &info); \ | |
1da177e4 LT |
549 | } |
550 | ||
b5964405 IM |
551 | #define DO_VM86_ERROR(trapnr, signr, str, name) \ |
552 | void do_##name(struct pt_regs *regs, long error_code) \ | |
553 | { \ | |
554 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
a8c1be9d | 555 | == NOTIFY_STOP) \ |
b5964405 IM |
556 | return; \ |
557 | do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \ | |
1da177e4 LT |
558 | } |
559 | ||
b5964405 IM |
560 | #define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
561 | void do_##name(struct pt_regs *regs, long error_code) \ | |
562 | { \ | |
563 | siginfo_t info; \ | |
564 | info.si_signo = signr; \ | |
565 | info.si_errno = 0; \ | |
566 | info.si_code = sicode; \ | |
567 | info.si_addr = (void __user *)siaddr; \ | |
568 | trace_hardirqs_fixup(); \ | |
569 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
a8c1be9d | 570 | == NOTIFY_STOP) \ |
b5964405 IM |
571 | return; \ |
572 | do_trap(trapnr, signr, str, 1, regs, error_code, &info); \ | |
1da177e4 LT |
573 | } |
574 | ||
a8c1be9d | 575 | DO_VM86_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
1da177e4 | 576 | #ifndef CONFIG_KPROBES |
b5964405 | 577 | DO_VM86_ERROR(3, SIGTRAP, "int3", int3) |
1da177e4 | 578 | #endif |
b5964405 IM |
579 | DO_VM86_ERROR(4, SIGSEGV, "overflow", overflow) |
580 | DO_VM86_ERROR(5, SIGSEGV, "bounds", bounds) | |
a8c1be9d AH |
581 | DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0) |
582 | DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
1da177e4 | 583 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) |
a8c1be9d AH |
584 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) |
585 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) | |
a10d9a71 | 586 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0) |
79bf0e03 | 587 | DO_ERROR_INFO(32, SIGILL, "iret exception", iret_error, ILL_BADSTK, 0, 1) |
1da177e4 | 588 | |
13485ab5 AH |
589 | void __kprobes |
590 | do_general_protection(struct pt_regs *regs, long error_code) | |
1da177e4 | 591 | { |
13485ab5 | 592 | struct task_struct *tsk; |
b5964405 IM |
593 | struct thread_struct *thread; |
594 | struct tss_struct *tss; | |
595 | int cpu; | |
596 | ||
597 | cpu = get_cpu(); | |
598 | tss = &per_cpu(init_tss, cpu); | |
599 | thread = ¤t->thread; | |
1da177e4 LT |
600 | |
601 | /* | |
602 | * Perform the lazy TSS's I/O bitmap copy. If the TSS has an | |
603 | * invalid offset set (the LAZY one) and the faulting thread has | |
604 | * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS | |
605 | * and we set the offset field correctly. Then we let the CPU to | |
606 | * restart the faulting instruction. | |
607 | */ | |
a75c54f9 | 608 | if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY && |
1da177e4 LT |
609 | thread->io_bitmap_ptr) { |
610 | memcpy(tss->io_bitmap, thread->io_bitmap_ptr, | |
611 | thread->io_bitmap_max); | |
612 | /* | |
613 | * If the previously set map was extending to higher ports | |
614 | * than the current one, pad extra space with 0xff (no access). | |
615 | */ | |
b5964405 | 616 | if (thread->io_bitmap_max < tss->io_bitmap_max) { |
1da177e4 LT |
617 | memset((char *) tss->io_bitmap + |
618 | thread->io_bitmap_max, 0xff, | |
619 | tss->io_bitmap_max - thread->io_bitmap_max); | |
b5964405 | 620 | } |
1da177e4 | 621 | tss->io_bitmap_max = thread->io_bitmap_max; |
a75c54f9 | 622 | tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET; |
d5cd4aad | 623 | tss->io_bitmap_owner = thread; |
1da177e4 | 624 | put_cpu(); |
b5964405 | 625 | |
1da177e4 LT |
626 | return; |
627 | } | |
628 | put_cpu(); | |
629 | ||
6b6891f9 | 630 | if (regs->flags & X86_VM_MASK) |
1da177e4 LT |
631 | goto gp_in_vm86; |
632 | ||
13485ab5 | 633 | tsk = current; |
717b594a | 634 | if (!user_mode(regs)) |
1da177e4 LT |
635 | goto gp_in_kernel; |
636 | ||
13485ab5 AH |
637 | tsk->thread.error_code = error_code; |
638 | tsk->thread.trap_no = 13; | |
b5964405 | 639 | |
13485ab5 AH |
640 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
641 | printk_ratelimit()) { | |
abd4f750 | 642 | printk(KERN_INFO |
13485ab5 AH |
643 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", |
644 | tsk->comm, task_pid_nr(tsk), | |
645 | regs->ip, regs->sp, error_code); | |
03252919 AK |
646 | print_vma_addr(" in ", regs->ip); |
647 | printk("\n"); | |
648 | } | |
abd4f750 | 649 | |
13485ab5 | 650 | force_sig(SIGSEGV, tsk); |
1da177e4 LT |
651 | return; |
652 | ||
653 | gp_in_vm86: | |
654 | local_irq_enable(); | |
655 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); | |
656 | return; | |
657 | ||
658 | gp_in_kernel: | |
13485ab5 AH |
659 | if (fixup_exception(regs)) |
660 | return; | |
661 | ||
662 | tsk->thread.error_code = error_code; | |
663 | tsk->thread.trap_no = 13; | |
664 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
1da177e4 | 665 | error_code, 13, SIGSEGV) == NOTIFY_STOP) |
13485ab5 AH |
666 | return; |
667 | die("general protection fault", regs, error_code); | |
1da177e4 LT |
668 | } |
669 | ||
5deb45e3 | 670 | static notrace __kprobes void |
b5964405 | 671 | mem_parity_error(unsigned char reason, struct pt_regs *regs) |
1da177e4 | 672 | { |
b5964405 IM |
673 | printk(KERN_EMERG |
674 | "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n", | |
675 | reason, smp_processor_id()); | |
676 | ||
677 | printk(KERN_EMERG | |
678 | "You have some hardware problem, likely on the PCI bus.\n"); | |
c0d12172 DJ |
679 | |
680 | #if defined(CONFIG_EDAC) | |
b5964405 | 681 | if (edac_handler_set()) { |
c0d12172 DJ |
682 | edac_atomic_assert_error(); |
683 | return; | |
684 | } | |
685 | #endif | |
686 | ||
8da5adda | 687 | if (panic_on_unrecovered_nmi) |
b5964405 | 688 | panic("NMI: Not continuing"); |
1da177e4 | 689 | |
c41c5cd3 | 690 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
691 | |
692 | /* Clear and disable the memory parity error line. */ | |
693 | clear_mem_error(reason); | |
694 | } | |
695 | ||
5deb45e3 | 696 | static notrace __kprobes void |
b5964405 | 697 | io_check_error(unsigned char reason, struct pt_regs *regs) |
1da177e4 LT |
698 | { |
699 | unsigned long i; | |
700 | ||
9c107805 | 701 | printk(KERN_EMERG "NMI: IOCK error (debug interrupt?)\n"); |
1da177e4 LT |
702 | show_registers(regs); |
703 | ||
704 | /* Re-enable the IOCK line, wait for a few seconds */ | |
705 | reason = (reason & 0xf) | 8; | |
706 | outb(reason, 0x61); | |
b5964405 | 707 | |
1da177e4 | 708 | i = 2000; |
b5964405 IM |
709 | while (--i) |
710 | udelay(1000); | |
711 | ||
1da177e4 LT |
712 | reason &= ~8; |
713 | outb(reason, 0x61); | |
714 | } | |
715 | ||
5deb45e3 | 716 | static notrace __kprobes void |
b5964405 | 717 | unknown_nmi_error(unsigned char reason, struct pt_regs *regs) |
1da177e4 | 718 | { |
d3597524 JW |
719 | if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
720 | return; | |
1da177e4 | 721 | #ifdef CONFIG_MCA |
b5964405 IM |
722 | /* |
723 | * Might actually be able to figure out what the guilty party | |
724 | * is: | |
725 | */ | |
726 | if (MCA_bus) { | |
1da177e4 LT |
727 | mca_handle_nmi(); |
728 | return; | |
729 | } | |
730 | #endif | |
b5964405 IM |
731 | printk(KERN_EMERG |
732 | "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n", | |
733 | reason, smp_processor_id()); | |
734 | ||
c41c5cd3 | 735 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); |
8da5adda | 736 | if (panic_on_unrecovered_nmi) |
b5964405 | 737 | panic("NMI: Not continuing"); |
8da5adda | 738 | |
c41c5cd3 | 739 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
740 | } |
741 | ||
742 | static DEFINE_SPINLOCK(nmi_print_lock); | |
743 | ||
ddca03c9 | 744 | void notrace __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 745 | { |
ddca03c9 | 746 | if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP) |
748f2edb GA |
747 | return; |
748 | ||
1da177e4 LT |
749 | spin_lock(&nmi_print_lock); |
750 | /* | |
751 | * We are in trouble anyway, lets at least try | |
b5964405 | 752 | * to get a message out: |
1da177e4 LT |
753 | */ |
754 | bust_spinlocks(1); | |
ddca03c9 | 755 | printk(KERN_EMERG "%s", str); |
65ea5b03 PA |
756 | printk(" on CPU%d, ip %08lx, registers:\n", |
757 | smp_processor_id(), regs->ip); | |
1da177e4 | 758 | show_registers(regs); |
ddca03c9 CG |
759 | if (do_panic) |
760 | panic("Non maskable interrupt"); | |
1da177e4 LT |
761 | console_silent(); |
762 | spin_unlock(&nmi_print_lock); | |
763 | bust_spinlocks(0); | |
6e274d14 | 764 | |
b5964405 IM |
765 | /* |
766 | * If we are in kernel we are probably nested up pretty bad | |
767 | * and might aswell get out now while we still can: | |
768 | */ | |
db753bdf | 769 | if (!user_mode_vm(regs)) { |
6e274d14 AN |
770 | current->thread.trap_no = 2; |
771 | crash_kexec(regs); | |
772 | } | |
773 | ||
1da177e4 LT |
774 | do_exit(SIGSEGV); |
775 | } | |
776 | ||
5deb45e3 | 777 | static notrace __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
778 | { |
779 | unsigned char reason = 0; | |
abd34807 AH |
780 | int cpu; |
781 | ||
782 | cpu = smp_processor_id(); | |
1da177e4 | 783 | |
abd34807 AH |
784 | /* Only the BSP gets external NMIs from the system. */ |
785 | if (!cpu) | |
1da177e4 | 786 | reason = get_nmi_reason(); |
b5964405 | 787 | |
1da177e4 | 788 | if (!(reason & 0xc0)) { |
20c0d2d4 | 789 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
a8c1be9d | 790 | == NOTIFY_STOP) |
1da177e4 LT |
791 | return; |
792 | #ifdef CONFIG_X86_LOCAL_APIC | |
793 | /* | |
794 | * Ok, so this is none of the documented NMI sources, | |
795 | * so it must be the NMI watchdog. | |
796 | */ | |
3adbbcce | 797 | if (nmi_watchdog_tick(regs, reason)) |
1da177e4 | 798 | return; |
abd34807 | 799 | if (!do_nmi_callback(regs, cpu)) |
3adbbcce | 800 | unknown_nmi_error(reason, regs); |
b5964405 IM |
801 | #else |
802 | unknown_nmi_error(reason, regs); | |
803 | #endif | |
2fbe7b25 | 804 | |
1da177e4 LT |
805 | return; |
806 | } | |
20c0d2d4 | 807 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 | 808 | return; |
a8c1be9d AH |
809 | |
810 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
1da177e4 LT |
811 | if (reason & 0x80) |
812 | mem_parity_error(reason, regs); | |
813 | if (reason & 0x40) | |
814 | io_check_error(reason, regs); | |
815 | /* | |
816 | * Reassert NMI in case it became active meanwhile | |
b5964405 | 817 | * as it's edge-triggered: |
1da177e4 LT |
818 | */ |
819 | reassert_nmi(); | |
820 | } | |
821 | ||
5deb45e3 | 822 | notrace __kprobes void do_nmi(struct pt_regs *regs, long error_code) |
1da177e4 LT |
823 | { |
824 | int cpu; | |
825 | ||
826 | nmi_enter(); | |
827 | ||
828 | cpu = smp_processor_id(); | |
f3705136 | 829 | |
1da177e4 LT |
830 | ++nmi_count(cpu); |
831 | ||
8f4e956b AK |
832 | if (!ignore_nmis) |
833 | default_do_nmi(regs); | |
1da177e4 LT |
834 | |
835 | nmi_exit(); | |
836 | } | |
837 | ||
8f4e956b AK |
838 | void stop_nmi(void) |
839 | { | |
840 | acpi_nmi_disable(); | |
841 | ignore_nmis++; | |
842 | } | |
843 | ||
844 | void restart_nmi(void) | |
845 | { | |
846 | ignore_nmis--; | |
847 | acpi_nmi_enable(); | |
848 | } | |
849 | ||
1da177e4 | 850 | #ifdef CONFIG_KPROBES |
75604d7f | 851 | void __kprobes do_int3(struct pt_regs *regs, long error_code) |
1da177e4 | 852 | { |
143a5d32 PZ |
853 | trace_hardirqs_fixup(); |
854 | ||
1da177e4 LT |
855 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) |
856 | == NOTIFY_STOP) | |
48c88211 | 857 | return; |
b5964405 IM |
858 | /* |
859 | * This is an interrupt gate, because kprobes wants interrupts | |
860 | * disabled. Normal trap handlers don't. | |
861 | */ | |
1da177e4 | 862 | restore_interrupts(regs); |
b5964405 | 863 | |
1da177e4 | 864 | do_trap(3, SIGTRAP, "int3", 1, regs, error_code, NULL); |
1da177e4 LT |
865 | } |
866 | #endif | |
867 | ||
868 | /* | |
869 | * Our handling of the processor debug registers is non-trivial. | |
870 | * We do not clear them on entry and exit from the kernel. Therefore | |
871 | * it is possible to get a watchpoint trap here from inside the kernel. | |
872 | * However, the code in ./ptrace.c has ensured that the user can | |
873 | * only set watchpoints on userspace addresses. Therefore the in-kernel | |
874 | * watchpoint trap can only occur in code which is reading/writing | |
875 | * from user space. Such code must not hold kernel locks (since it | |
876 | * can equally take a page fault), therefore it is safe to call | |
877 | * force_sig_info even though that claims and releases locks. | |
b5964405 | 878 | * |
1da177e4 LT |
879 | * Code in ./signal.c ensures that the debug control register |
880 | * is restored before we deliver any signal, and therefore that | |
881 | * user code runs with the correct debug control register even though | |
882 | * we clear it here. | |
883 | * | |
884 | * Being careful here means that we don't have to be as careful in a | |
885 | * lot of more complicated places (task switching can be a bit lazy | |
886 | * about restoring all the debug state, and ptrace doesn't have to | |
887 | * find every occurrence of the TF bit that could be saved away even | |
888 | * by user code) | |
889 | */ | |
b5964405 | 890 | void __kprobes do_debug(struct pt_regs *regs, long error_code) |
1da177e4 | 891 | { |
1da177e4 | 892 | struct task_struct *tsk = current; |
b5964405 | 893 | unsigned int condition; |
da654b74 | 894 | int si_code; |
1da177e4 | 895 | |
000f4a9e PZ |
896 | trace_hardirqs_fixup(); |
897 | ||
1cc6f12e | 898 | get_debugreg(condition, 6); |
1da177e4 | 899 | |
10faa81e RM |
900 | /* |
901 | * The processor cleared BTF, so don't mark that we need it set. | |
902 | */ | |
903 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); | |
904 | tsk->thread.debugctlmsr = 0; | |
905 | ||
1da177e4 | 906 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
a8c1be9d | 907 | SIGTRAP) == NOTIFY_STOP) |
1da177e4 LT |
908 | return; |
909 | /* It's safe to allow irq's after DR6 has been saved */ | |
65ea5b03 | 910 | if (regs->flags & X86_EFLAGS_IF) |
1da177e4 LT |
911 | local_irq_enable(); |
912 | ||
913 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
914 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
0f534093 | 915 | if (!tsk->thread.debugreg7) |
1da177e4 LT |
916 | goto clear_dr7; |
917 | } | |
918 | ||
6b6891f9 | 919 | if (regs->flags & X86_VM_MASK) |
1da177e4 LT |
920 | goto debug_vm86; |
921 | ||
922 | /* Save debug status register where ptrace can see it */ | |
0f534093 | 923 | tsk->thread.debugreg6 = condition; |
1da177e4 LT |
924 | |
925 | /* | |
926 | * Single-stepping through TF: make sure we ignore any events in | |
927 | * kernel space (but re-enable TF when returning to user mode). | |
928 | */ | |
929 | if (condition & DR_STEP) { | |
930 | /* | |
931 | * We already checked v86 mode above, so we can | |
932 | * check for kernel mode by just checking the CPL | |
933 | * of CS. | |
934 | */ | |
717b594a | 935 | if (!user_mode(regs)) |
1da177e4 LT |
936 | goto clear_TF_reenable; |
937 | } | |
938 | ||
da654b74 | 939 | si_code = get_si_code((unsigned long)condition); |
1da177e4 | 940 | /* Ok, finally something we can handle */ |
da654b74 | 941 | send_sigtrap(tsk, regs, error_code, si_code); |
1da177e4 | 942 | |
b5964405 IM |
943 | /* |
944 | * Disable additional traps. They'll be re-enabled when | |
1da177e4 LT |
945 | * the signal is delivered. |
946 | */ | |
947 | clear_dr7: | |
1cc6f12e | 948 | set_debugreg(0, 7); |
1da177e4 LT |
949 | return; |
950 | ||
951 | debug_vm86: | |
952 | handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, 1); | |
953 | return; | |
954 | ||
955 | clear_TF_reenable: | |
956 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
6093015d | 957 | regs->flags &= ~X86_EFLAGS_TF; |
1da177e4 LT |
958 | return; |
959 | } | |
960 | ||
961 | /* | |
962 | * Note that we play around with the 'TS' bit in an attempt to get | |
963 | * the correct behaviour even in the presence of the asynchronous | |
964 | * IRQ13 behaviour | |
965 | */ | |
65ea5b03 | 966 | void math_error(void __user *ip) |
1da177e4 | 967 | { |
b5964405 | 968 | struct task_struct *task; |
1da177e4 | 969 | siginfo_t info; |
7b4fd4bb | 970 | unsigned short cwd, swd; |
1da177e4 LT |
971 | |
972 | /* | |
973 | * Save the info for the exception handler and clear the error. | |
974 | */ | |
975 | task = current; | |
976 | save_init_fpu(task); | |
977 | task->thread.trap_no = 16; | |
978 | task->thread.error_code = 0; | |
979 | info.si_signo = SIGFPE; | |
980 | info.si_errno = 0; | |
981 | info.si_code = __SI_FAULT; | |
65ea5b03 | 982 | info.si_addr = ip; |
1da177e4 LT |
983 | /* |
984 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
985 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
986 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
987 | * fault bit. We should only be taking one exception at a time, | |
988 | * so if this combination doesn't produce any single exception, | |
a8c1be9d | 989 | * then we have a bad program that isn't synchronizing its FPU usage |
1da177e4 LT |
990 | * and it will suffer the consequences since we won't be able to |
991 | * fully reproduce the context of the exception | |
992 | */ | |
993 | cwd = get_fpu_cwd(task); | |
994 | swd = get_fpu_swd(task); | |
b1daec30 | 995 | switch (swd & ~cwd & 0x3f) { |
b5964405 IM |
996 | case 0x000: /* No unmasked exception */ |
997 | return; | |
a8c1be9d | 998 | default: /* Multiple exceptions */ |
b5964405 IM |
999 | break; |
1000 | case 0x001: /* Invalid Op */ | |
1001 | /* | |
1002 | * swd & 0x240 == 0x040: Stack Underflow | |
1003 | * swd & 0x240 == 0x240: Stack Overflow | |
1004 | * User must clear the SF bit (0x40) if set | |
1005 | */ | |
1006 | info.si_code = FPE_FLTINV; | |
1007 | break; | |
1008 | case 0x002: /* Denormalize */ | |
1009 | case 0x010: /* Underflow */ | |
1010 | info.si_code = FPE_FLTUND; | |
1011 | break; | |
1012 | case 0x004: /* Zero Divide */ | |
1013 | info.si_code = FPE_FLTDIV; | |
1014 | break; | |
1015 | case 0x008: /* Overflow */ | |
1016 | info.si_code = FPE_FLTOVF; | |
1017 | break; | |
1018 | case 0x020: /* Precision */ | |
1019 | info.si_code = FPE_FLTRES; | |
1020 | break; | |
1da177e4 LT |
1021 | } |
1022 | force_sig_info(SIGFPE, &info, task); | |
1023 | } | |
1024 | ||
b5964405 | 1025 | void do_coprocessor_error(struct pt_regs *regs, long error_code) |
1da177e4 LT |
1026 | { |
1027 | ignore_fpu_irq = 1; | |
65ea5b03 | 1028 | math_error((void __user *)regs->ip); |
1da177e4 LT |
1029 | } |
1030 | ||
65ea5b03 | 1031 | static void simd_math_error(void __user *ip) |
1da177e4 | 1032 | { |
b5964405 | 1033 | struct task_struct *task; |
b5964405 | 1034 | siginfo_t info; |
7b4fd4bb | 1035 | unsigned short mxcsr; |
1da177e4 LT |
1036 | |
1037 | /* | |
1038 | * Save the info for the exception handler and clear the error. | |
1039 | */ | |
1040 | task = current; | |
1041 | save_init_fpu(task); | |
1042 | task->thread.trap_no = 19; | |
1043 | task->thread.error_code = 0; | |
1044 | info.si_signo = SIGFPE; | |
1045 | info.si_errno = 0; | |
1046 | info.si_code = __SI_FAULT; | |
65ea5b03 | 1047 | info.si_addr = ip; |
1da177e4 LT |
1048 | /* |
1049 | * The SIMD FPU exceptions are handled a little differently, as there | |
1050 | * is only a single status/control register. Thus, to determine which | |
1051 | * unmasked exception was caught we must mask the exception mask bits | |
1052 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1053 | */ | |
1054 | mxcsr = get_fpu_mxcsr(task); | |
1055 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
b5964405 IM |
1056 | case 0x000: |
1057 | default: | |
1058 | break; | |
1059 | case 0x001: /* Invalid Op */ | |
1060 | info.si_code = FPE_FLTINV; | |
1061 | break; | |
1062 | case 0x002: /* Denormalize */ | |
1063 | case 0x010: /* Underflow */ | |
1064 | info.si_code = FPE_FLTUND; | |
1065 | break; | |
1066 | case 0x004: /* Zero Divide */ | |
1067 | info.si_code = FPE_FLTDIV; | |
1068 | break; | |
1069 | case 0x008: /* Overflow */ | |
1070 | info.si_code = FPE_FLTOVF; | |
1071 | break; | |
1072 | case 0x020: /* Precision */ | |
1073 | info.si_code = FPE_FLTRES; | |
1074 | break; | |
1da177e4 LT |
1075 | } |
1076 | force_sig_info(SIGFPE, &info, task); | |
1077 | } | |
1078 | ||
b5964405 | 1079 | void do_simd_coprocessor_error(struct pt_regs *regs, long error_code) |
1da177e4 LT |
1080 | { |
1081 | if (cpu_has_xmm) { | |
1082 | /* Handle SIMD FPU exceptions on PIII+ processors. */ | |
1083 | ignore_fpu_irq = 1; | |
65ea5b03 | 1084 | simd_math_error((void __user *)regs->ip); |
b5964405 IM |
1085 | return; |
1086 | } | |
1087 | /* | |
1088 | * Handle strange cache flush from user space exception | |
1089 | * in all other cases. This is undocumented behaviour. | |
1090 | */ | |
6b6891f9 | 1091 | if (regs->flags & X86_VM_MASK) { |
b5964405 IM |
1092 | handle_vm86_fault((struct kernel_vm86_regs *)regs, error_code); |
1093 | return; | |
1da177e4 | 1094 | } |
b5964405 IM |
1095 | current->thread.trap_no = 19; |
1096 | current->thread.error_code = error_code; | |
1097 | die_if_kernel("cache flush denied", regs, error_code); | |
1098 | force_sig(SIGSEGV, current); | |
1da177e4 LT |
1099 | } |
1100 | ||
b5964405 | 1101 | void do_spurious_interrupt_bug(struct pt_regs *regs, long error_code) |
1da177e4 LT |
1102 | { |
1103 | #if 0 | |
1104 | /* No need to warn about this any longer. */ | |
b5964405 | 1105 | printk(KERN_INFO "Ignoring P6 Local APIC Spurious Interrupt Bug...\n"); |
1da177e4 LT |
1106 | #endif |
1107 | } | |
1108 | ||
b5964405 | 1109 | unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp) |
1da177e4 | 1110 | { |
736f12bf | 1111 | struct desc_struct *gdt = get_cpu_gdt_table(smp_processor_id()); |
be44d2aa SS |
1112 | unsigned long base = (kesp - uesp) & -THREAD_SIZE; |
1113 | unsigned long new_kesp = kesp - base; | |
1114 | unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT; | |
1115 | __u64 desc = *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS]; | |
b5964405 | 1116 | |
be44d2aa | 1117 | /* Set up base for espfix segment */ |
b5964405 IM |
1118 | desc &= 0x00f0ff0000000000ULL; |
1119 | desc |= ((((__u64)base) << 16) & 0x000000ffffff0000ULL) | | |
be44d2aa SS |
1120 | ((((__u64)base) << 32) & 0xff00000000000000ULL) | |
1121 | ((((__u64)lim_pages) << 32) & 0x000f000000000000ULL) | | |
1122 | (lim_pages & 0xffff); | |
1123 | *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS] = desc; | |
b5964405 | 1124 | |
be44d2aa | 1125 | return new_kesp; |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | /* | |
b5964405 | 1129 | * 'math_state_restore()' saves the current math information in the |
1da177e4 LT |
1130 | * old math state array, and gets the new ones from the current task |
1131 | * | |
1132 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1133 | * Don't touch unless you *really* know how it works. | |
1134 | * | |
1135 | * Must be called with kernel preemption disabled (in this case, | |
1136 | * local interrupts are disabled at the call-site in entry.S). | |
1137 | */ | |
acc20761 | 1138 | asmlinkage void math_state_restore(void) |
1da177e4 LT |
1139 | { |
1140 | struct thread_info *thread = current_thread_info(); | |
1141 | struct task_struct *tsk = thread->task; | |
1142 | ||
aa283f49 SS |
1143 | if (!tsk_used_math(tsk)) { |
1144 | local_irq_enable(); | |
1145 | /* | |
1146 | * does a slab alloc which can sleep | |
1147 | */ | |
1148 | if (init_fpu(tsk)) { | |
1149 | /* | |
1150 | * ran out of memory! | |
1151 | */ | |
1152 | do_group_exit(SIGKILL); | |
1153 | return; | |
1154 | } | |
1155 | local_irq_disable(); | |
1156 | } | |
1157 | ||
b5964405 | 1158 | clts(); /* Allow maths ops (or we recurse) */ |
1da177e4 LT |
1159 | restore_fpu(tsk); |
1160 | thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */ | |
acc20761 | 1161 | tsk->fpu_counter++; |
1da177e4 | 1162 | } |
5992b6da | 1163 | EXPORT_SYMBOL_GPL(math_state_restore); |
1da177e4 LT |
1164 | |
1165 | #ifndef CONFIG_MATH_EMULATION | |
1166 | ||
1167 | asmlinkage void math_emulate(long arg) | |
1168 | { | |
b5964405 IM |
1169 | printk(KERN_EMERG |
1170 | "math-emulation not enabled and no coprocessor found.\n"); | |
1171 | printk(KERN_EMERG "killing %s.\n", current->comm); | |
1172 | force_sig(SIGFPE, current); | |
1da177e4 LT |
1173 | schedule(); |
1174 | } | |
1175 | ||
1176 | #endif /* CONFIG_MATH_EMULATION */ | |
1177 | ||
1da177e4 LT |
1178 | void __init trap_init(void) |
1179 | { | |
dbeb2be2 RR |
1180 | int i; |
1181 | ||
1da177e4 | 1182 | #ifdef CONFIG_EISA |
927222b1 | 1183 | void __iomem *p = early_ioremap(0x0FFFD9, 4); |
b5964405 IM |
1184 | |
1185 | if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24)) | |
1da177e4 | 1186 | EISA_bus = 1; |
927222b1 | 1187 | early_iounmap(p, 4); |
1da177e4 LT |
1188 | #endif |
1189 | ||
a8c1be9d AH |
1190 | set_trap_gate(0, ÷_error); |
1191 | set_intr_gate(1, &debug); | |
1192 | set_intr_gate(2, &nmi); | |
1193 | set_system_intr_gate(3, &int3); /* int3 can be called from all */ | |
1194 | set_system_gate(4, &overflow); /* int4 can be called from all */ | |
1195 | set_trap_gate(5, &bounds); | |
1196 | set_trap_gate(6, &invalid_op); | |
1197 | set_trap_gate(7, &device_not_available); | |
1198 | set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS); | |
1199 | set_trap_gate(9, &coprocessor_segment_overrun); | |
b5964405 IM |
1200 | set_trap_gate(10, &invalid_TSS); |
1201 | set_trap_gate(11, &segment_not_present); | |
1202 | set_trap_gate(12, &stack_segment); | |
1203 | set_trap_gate(13, &general_protection); | |
1204 | set_intr_gate(14, &page_fault); | |
1205 | set_trap_gate(15, &spurious_interrupt_bug); | |
1206 | set_trap_gate(16, &coprocessor_error); | |
1207 | set_trap_gate(17, &alignment_check); | |
1da177e4 | 1208 | #ifdef CONFIG_X86_MCE |
b5964405 | 1209 | set_trap_gate(18, &machine_check); |
1da177e4 | 1210 | #endif |
b5964405 | 1211 | set_trap_gate(19, &simd_coprocessor_error); |
1da177e4 | 1212 | |
d43c6e80 | 1213 | if (cpu_has_fxsr) { |
d43c6e80 JB |
1214 | printk(KERN_INFO "Enabling fast FPU save and restore... "); |
1215 | set_in_cr4(X86_CR4_OSFXSR); | |
1216 | printk("done.\n"); | |
1217 | } | |
1218 | if (cpu_has_xmm) { | |
b5964405 IM |
1219 | printk(KERN_INFO |
1220 | "Enabling unmasked SIMD FPU exception support... "); | |
d43c6e80 JB |
1221 | set_in_cr4(X86_CR4_OSXMMEXCPT); |
1222 | printk("done.\n"); | |
1223 | } | |
1224 | ||
b5964405 | 1225 | set_system_gate(SYSCALL_VECTOR, &system_call); |
1da177e4 | 1226 | |
b5964405 | 1227 | /* Reserve all the builtin and the syscall vector: */ |
dbeb2be2 RR |
1228 | for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++) |
1229 | set_bit(i, used_vectors); | |
b5964405 | 1230 | |
dbeb2be2 RR |
1231 | set_bit(SYSCALL_VECTOR, used_vectors); |
1232 | ||
1da177e4 | 1233 | /* |
b5964405 | 1234 | * Should be a barrier for any external CPU state: |
1da177e4 LT |
1235 | */ |
1236 | cpu_init(); | |
1237 | ||
1238 | trap_init_hook(); | |
1239 | } | |
1240 | ||
1241 | static int __init kstack_setup(char *s) | |
1242 | { | |
1243 | kstack_depth_to_print = simple_strtoul(s, NULL, 0); | |
b5964405 | 1244 | |
9b41046c | 1245 | return 1; |
1da177e4 LT |
1246 | } |
1247 | __setup("kstack=", kstack_setup); | |
86c41837 CE |
1248 | |
1249 | static int __init code_bytes_setup(char *s) | |
1250 | { | |
1251 | code_bytes = simple_strtoul(s, NULL, 0); | |
1252 | if (code_bytes > 8192) | |
1253 | code_bytes = 8192; | |
1254 | ||
1255 | return 1; | |
1256 | } | |
1257 | __setup("code_bytes=", code_bytes_setup); |