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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/x86-64/traps.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs | |
6 | * | |
7 | * Pentium III FXSR, SSE support | |
8 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
1da177e4 LT |
9 | */ |
10 | ||
11 | /* | |
12 | * 'Traps.c' handles hardware traps and faults after we have saved some | |
13 | * state in 'entry.S'. | |
14 | */ | |
1da177e4 LT |
15 | #include <linux/sched.h> |
16 | #include <linux/kernel.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/timer.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/interrupt.h> | |
4b0ff1a9 | 26 | #include <linux/kallsyms.h> |
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <linux/moduleparam.h> | |
35faa714 | 29 | #include <linux/nmi.h> |
0f2fbdcb | 30 | #include <linux/kprobes.h> |
8bcc5280 | 31 | #include <linux/kexec.h> |
b538ed27 | 32 | #include <linux/unwind.h> |
ab2bf0c1 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | |
35 | #include <asm/system.h> | |
1da177e4 LT |
36 | #include <asm/io.h> |
37 | #include <asm/atomic.h> | |
38 | #include <asm/debugreg.h> | |
39 | #include <asm/desc.h> | |
40 | #include <asm/i387.h> | |
41 | #include <asm/kdebug.h> | |
42 | #include <asm/processor.h> | |
b538ed27 | 43 | #include <asm/unwind.h> |
1da177e4 LT |
44 | #include <asm/smp.h> |
45 | #include <asm/pgalloc.h> | |
46 | #include <asm/pda.h> | |
47 | #include <asm/proto.h> | |
48 | #include <asm/nmi.h> | |
c0b766f1 | 49 | #include <asm/stacktrace.h> |
1da177e4 | 50 | |
1da177e4 LT |
51 | asmlinkage void divide_error(void); |
52 | asmlinkage void debug(void); | |
53 | asmlinkage void nmi(void); | |
54 | asmlinkage void int3(void); | |
55 | asmlinkage void overflow(void); | |
56 | asmlinkage void bounds(void); | |
57 | asmlinkage void invalid_op(void); | |
58 | asmlinkage void device_not_available(void); | |
59 | asmlinkage void double_fault(void); | |
60 | asmlinkage void coprocessor_segment_overrun(void); | |
61 | asmlinkage void invalid_TSS(void); | |
62 | asmlinkage void segment_not_present(void); | |
63 | asmlinkage void stack_segment(void); | |
64 | asmlinkage void general_protection(void); | |
65 | asmlinkage void page_fault(void); | |
66 | asmlinkage void coprocessor_error(void); | |
67 | asmlinkage void simd_coprocessor_error(void); | |
68 | asmlinkage void reserved(void); | |
69 | asmlinkage void alignment_check(void); | |
70 | asmlinkage void machine_check(void); | |
71 | asmlinkage void spurious_interrupt_bug(void); | |
1da177e4 | 72 | |
e041c683 | 73 | ATOMIC_NOTIFIER_HEAD(die_chain); |
2ee60e17 | 74 | EXPORT_SYMBOL(die_chain); |
1da177e4 LT |
75 | |
76 | int register_die_notifier(struct notifier_block *nb) | |
77 | { | |
8c914cb7 | 78 | vmalloc_sync_all(); |
e041c683 AS |
79 | return atomic_notifier_chain_register(&die_chain, nb); |
80 | } | |
1454aed9 | 81 | EXPORT_SYMBOL(register_die_notifier); /* used modular by kdb */ |
e041c683 AS |
82 | |
83 | int unregister_die_notifier(struct notifier_block *nb) | |
84 | { | |
85 | return atomic_notifier_chain_unregister(&die_chain, nb); | |
1da177e4 | 86 | } |
1454aed9 | 87 | EXPORT_SYMBOL(unregister_die_notifier); /* used modular by kdb */ |
1da177e4 LT |
88 | |
89 | static inline void conditional_sti(struct pt_regs *regs) | |
90 | { | |
91 | if (regs->eflags & X86_EFLAGS_IF) | |
92 | local_irq_enable(); | |
93 | } | |
94 | ||
a65d17c9 JB |
95 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
96 | { | |
97 | preempt_disable(); | |
98 | if (regs->eflags & X86_EFLAGS_IF) | |
99 | local_irq_enable(); | |
100 | } | |
101 | ||
102 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
103 | { | |
104 | if (regs->eflags & X86_EFLAGS_IF) | |
105 | local_irq_disable(); | |
40e59a61 AK |
106 | /* Make sure to not schedule here because we could be running |
107 | on an exception stack. */ | |
a65d17c9 JB |
108 | preempt_enable_no_resched(); |
109 | } | |
110 | ||
0741f4d2 | 111 | int kstack_depth_to_print = 12; |
ea424055 | 112 | #ifdef CONFIG_STACK_UNWIND |
c33bd9aa | 113 | static int call_trace = 1; |
ea424055 JB |
114 | #else |
115 | #define call_trace (-1) | |
116 | #endif | |
1da177e4 LT |
117 | |
118 | #ifdef CONFIG_KALLSYMS | |
3ac94932 IM |
119 | void printk_address(unsigned long address) |
120 | { | |
1da177e4 LT |
121 | unsigned long offset = 0, symsize; |
122 | const char *symname; | |
123 | char *modname; | |
3ac94932 | 124 | char *delim = ":"; |
1da177e4 LT |
125 | char namebuf[128]; |
126 | ||
3ac94932 IM |
127 | symname = kallsyms_lookup(address, &symsize, &offset, |
128 | &modname, namebuf); | |
129 | if (!symname) { | |
130 | printk(" [<%016lx>]\n", address); | |
131 | return; | |
132 | } | |
133 | if (!modname) | |
1da177e4 | 134 | modname = delim = ""; |
3ac94932 IM |
135 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
136 | address, delim, modname, delim, symname, offset, symsize); | |
137 | } | |
1da177e4 | 138 | #else |
3ac94932 IM |
139 | void printk_address(unsigned long address) |
140 | { | |
141 | printk(" [<%016lx>]\n", address); | |
142 | } | |
1da177e4 LT |
143 | #endif |
144 | ||
0a658002 | 145 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 146 | unsigned *usedp, char **idp) |
0a658002 | 147 | { |
b556b35e | 148 | static char ids[][8] = { |
0a658002 AK |
149 | [DEBUG_STACK - 1] = "#DB", |
150 | [NMI_STACK - 1] = "NMI", | |
151 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
152 | [STACKFAULT_STACK - 1] = "#SS", | |
153 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
154 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
155 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
156 | #endif | |
0a658002 AK |
157 | }; |
158 | unsigned k; | |
1da177e4 | 159 | |
c9ca1ba5 IM |
160 | /* |
161 | * Iterate over all exception stacks, and figure out whether | |
162 | * 'stack' is in one of them: | |
163 | */ | |
0a658002 | 164 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 165 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
166 | /* |
167 | * Is 'stack' above this exception frame's end? | |
168 | * If yes then skip to the next frame. | |
169 | */ | |
0a658002 AK |
170 | if (stack >= end) |
171 | continue; | |
c9ca1ba5 IM |
172 | /* |
173 | * Is 'stack' above this exception frame's start address? | |
174 | * If yes then we found the right frame. | |
175 | */ | |
0a658002 | 176 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
177 | /* |
178 | * Make sure we only iterate through an exception | |
179 | * stack once. If it comes up for the second time | |
180 | * then there's something wrong going on - just | |
181 | * break out and return NULL: | |
182 | */ | |
0a658002 AK |
183 | if (*usedp & (1U << k)) |
184 | break; | |
185 | *usedp |= 1U << k; | |
186 | *idp = ids[k]; | |
187 | return (unsigned long *)end; | |
188 | } | |
c9ca1ba5 IM |
189 | /* |
190 | * If this is a debug stack, and if it has a larger size than | |
191 | * the usual exception stacks, then 'stack' might still | |
192 | * be within the lower portion of the debug stack: | |
193 | */ | |
b556b35e JB |
194 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
195 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
196 | unsigned j = N_EXCEPTION_STACKS - 1; | |
197 | ||
c9ca1ba5 IM |
198 | /* |
199 | * Black magic. A large debug stack is composed of | |
200 | * multiple exception stack entries, which we | |
201 | * iterate through now. Dont look: | |
202 | */ | |
b556b35e JB |
203 | do { |
204 | ++j; | |
205 | end -= EXCEPTION_STKSZ; | |
206 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
207 | } while (stack < end - EXCEPTION_STKSZ); | |
208 | if (*usedp & (1U << j)) | |
209 | break; | |
210 | *usedp |= 1U << j; | |
211 | *idp = ids[j]; | |
212 | return (unsigned long *)end; | |
213 | } | |
214 | #endif | |
1da177e4 LT |
215 | } |
216 | return NULL; | |
0a658002 | 217 | } |
1da177e4 | 218 | |
c0b766f1 AK |
219 | struct ops_and_data { |
220 | struct stacktrace_ops *ops; | |
221 | void *data; | |
222 | }; | |
223 | ||
224 | static int dump_trace_unwind(struct unwind_frame_info *info, void *context) | |
b538ed27 | 225 | { |
c0b766f1 | 226 | struct ops_and_data *oad = (struct ops_and_data *)context; |
3ac94932 | 227 | int n = 0; |
b538ed27 JB |
228 | |
229 | while (unwind(info) == 0 && UNW_PC(info)) { | |
3ac94932 | 230 | n++; |
c0b766f1 | 231 | oad->ops->address(oad->data, UNW_PC(info)); |
b538ed27 JB |
232 | if (arch_unw_user_mode(info)) |
233 | break; | |
234 | } | |
c33bd9aa | 235 | return n; |
b538ed27 JB |
236 | } |
237 | ||
b615ebda AK |
238 | #define MSG(txt) ops->warning(data, txt) |
239 | ||
1da177e4 LT |
240 | /* |
241 | * x86-64 can have upto three kernel stacks: | |
242 | * process stack | |
243 | * interrupt stack | |
0a658002 | 244 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
245 | */ |
246 | ||
c547c77e AK |
247 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
248 | { | |
249 | void *t = (void *)tinfo; | |
250 | return p > t && p < t + THREAD_SIZE - 3; | |
251 | } | |
252 | ||
b615ebda AK |
253 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
254 | unsigned long *stack, | |
c0b766f1 | 255 | struct stacktrace_ops *ops, void *data) |
1da177e4 | 256 | { |
da68933e | 257 | const unsigned cpu = get_cpu(); |
b615ebda | 258 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 259 | unsigned used = 0; |
c547c77e | 260 | struct thread_info *tinfo; |
1da177e4 | 261 | |
b538ed27 JB |
262 | if (!tsk) |
263 | tsk = current; | |
264 | ||
c33bd9aa JB |
265 | if (call_trace >= 0) { |
266 | int unw_ret = 0; | |
267 | struct unwind_frame_info info; | |
c0b766f1 | 268 | struct ops_and_data oad = { .ops = ops, .data = data }; |
c33bd9aa JB |
269 | |
270 | if (regs) { | |
271 | if (unwind_init_frame_info(&info, tsk, regs) == 0) | |
c0b766f1 | 272 | unw_ret = dump_trace_unwind(&info, &oad); |
c33bd9aa | 273 | } else if (tsk == current) |
b615ebda AK |
274 | unw_ret = unwind_init_running(&info, dump_trace_unwind, |
275 | &oad); | |
c33bd9aa JB |
276 | else { |
277 | if (unwind_init_blocked(&info, tsk) == 0) | |
c0b766f1 | 278 | unw_ret = dump_trace_unwind(&info, &oad); |
b538ed27 | 279 | } |
ea424055 JB |
280 | if (unw_ret > 0) { |
281 | if (call_trace == 1 && !arch_unw_user_mode(&info)) { | |
b615ebda | 282 | ops->warning_symbol(data, |
dd315df1 | 283 | "DWARF2 unwinder stuck at %s", |
ea424055 JB |
284 | UNW_PC(&info)); |
285 | if ((long)UNW_SP(&info) < 0) { | |
b615ebda | 286 | MSG("Leftover inexact backtrace:"); |
ea424055 | 287 | stack = (unsigned long *)UNW_SP(&info); |
be7a9170 | 288 | if (!stack) |
da68933e | 289 | goto out; |
ea424055 | 290 | } else |
dd315df1 | 291 | MSG("Full inexact backtrace again:"); |
ea424055 | 292 | } else if (call_trace >= 1) |
da68933e | 293 | goto out; |
b13761ec | 294 | else |
dd315df1 | 295 | MSG("Full inexact backtrace again:"); |
ea424055 | 296 | } else |
dd315df1 | 297 | MSG("Inexact backtrace:"); |
c0b766f1 AK |
298 | } |
299 | if (!stack) { | |
300 | unsigned long dummy; | |
301 | stack = &dummy; | |
302 | if (tsk && tsk != current) | |
303 | stack = (unsigned long *)tsk->thread.rsp; | |
b538ed27 | 304 | } |
0796bdb7 IM |
305 | /* |
306 | * Align the stack pointer on word boundary, later loops | |
307 | * rely on that (and corruption / debug info bugs can cause | |
308 | * unaligned values here): | |
309 | */ | |
310 | stack = (unsigned long *)((unsigned long)stack & ~(sizeof(long)-1)); | |
b538ed27 | 311 | |
c9ca1ba5 IM |
312 | /* |
313 | * Print function call entries within a stack. 'cond' is the | |
314 | * "end of stackframe" condition, that the 'stack++' | |
315 | * iteration will eventually trigger. | |
316 | */ | |
0a658002 AK |
317 | #define HANDLE_STACK(cond) \ |
318 | do while (cond) { \ | |
1b2f6304 | 319 | unsigned long addr = *stack++; \ |
e8c7391d AK |
320 | if (oops_in_progress ? \ |
321 | __kernel_text_address(addr) : \ | |
322 | kernel_text_address(addr)) { \ | |
0a658002 AK |
323 | /* \ |
324 | * If the address is either in the text segment of the \ | |
325 | * kernel, or in the region which contains vmalloc'ed \ | |
326 | * memory, it *may* be the address of a calling \ | |
327 | * routine; if so, print it so that someone tracing \ | |
328 | * down the cause of the crash will be able to figure \ | |
329 | * out the call path that was taken. \ | |
330 | */ \ | |
c0b766f1 | 331 | ops->address(data, addr); \ |
0a658002 AK |
332 | } \ |
333 | } while (0) | |
334 | ||
c9ca1ba5 IM |
335 | /* |
336 | * Print function call entries in all stacks, starting at the | |
337 | * current stack address. If the stacks consist of nested | |
338 | * exceptions | |
339 | */ | |
c0b766f1 AK |
340 | for (;;) { |
341 | char *id; | |
0a658002 AK |
342 | unsigned long *estack_end; |
343 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
344 | &used, &id); | |
345 | ||
346 | if (estack_end) { | |
c0b766f1 AK |
347 | if (ops->stack(data, id) < 0) |
348 | break; | |
0a658002 | 349 | HANDLE_STACK (stack < estack_end); |
c0b766f1 | 350 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
351 | /* |
352 | * We link to the next stack via the | |
353 | * second-to-last pointer (index -2 to end) in the | |
354 | * exception stack: | |
355 | */ | |
0a658002 AK |
356 | stack = (unsigned long *) estack_end[-2]; |
357 | continue; | |
1da177e4 | 358 | } |
0a658002 AK |
359 | if (irqstack_end) { |
360 | unsigned long *irqstack; | |
361 | irqstack = irqstack_end - | |
362 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
363 | ||
364 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
365 | if (ops->stack(data, "IRQ") < 0) |
366 | break; | |
0a658002 | 367 | HANDLE_STACK (stack < irqstack_end); |
c9ca1ba5 IM |
368 | /* |
369 | * We link to the next stack (which would be | |
370 | * the process stack normally) the last | |
371 | * pointer (index -1 to end) in the IRQ stack: | |
372 | */ | |
0a658002 AK |
373 | stack = (unsigned long *) (irqstack_end[-1]); |
374 | irqstack_end = NULL; | |
c0b766f1 | 375 | ops->stack(data, "EOI"); |
0a658002 | 376 | continue; |
1da177e4 | 377 | } |
1da177e4 | 378 | } |
0a658002 | 379 | break; |
1da177e4 | 380 | } |
0a658002 | 381 | |
c9ca1ba5 | 382 | /* |
c0b766f1 | 383 | * This handles the process stack: |
c9ca1ba5 | 384 | */ |
c547c77e AK |
385 | tinfo = current_thread_info(); |
386 | HANDLE_STACK (valid_stack_ptr(tinfo, stack)); | |
0a658002 | 387 | #undef HANDLE_STACK |
da68933e AM |
388 | out: |
389 | put_cpu(); | |
c0b766f1 AK |
390 | } |
391 | EXPORT_SYMBOL(dump_trace); | |
392 | ||
393 | static void | |
394 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
395 | { | |
396 | print_symbol(msg, symbol); | |
397 | printk("\n"); | |
398 | } | |
399 | ||
400 | static void print_trace_warning(void *data, char *msg) | |
401 | { | |
402 | printk("%s\n", msg); | |
403 | } | |
404 | ||
405 | static int print_trace_stack(void *data, char *name) | |
406 | { | |
407 | printk(" <%s> ", name); | |
408 | return 0; | |
409 | } | |
3ac94932 | 410 | |
c0b766f1 AK |
411 | static void print_trace_address(void *data, unsigned long addr) |
412 | { | |
413 | printk_address(addr); | |
414 | } | |
415 | ||
416 | static struct stacktrace_ops print_trace_ops = { | |
417 | .warning = print_trace_warning, | |
418 | .warning_symbol = print_trace_warning_symbol, | |
419 | .stack = print_trace_stack, | |
420 | .address = print_trace_address, | |
421 | }; | |
422 | ||
423 | void | |
424 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) | |
425 | { | |
426 | printk("\nCall Trace:\n"); | |
427 | dump_trace(tsk, regs, stack, &print_trace_ops, NULL); | |
1da177e4 LT |
428 | printk("\n"); |
429 | } | |
430 | ||
c0b766f1 AK |
431 | static void |
432 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp) | |
1da177e4 LT |
433 | { |
434 | unsigned long *stack; | |
435 | int i; | |
151f8cc1 | 436 | const int cpu = smp_processor_id(); |
df79efde RT |
437 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
438 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
439 | |
440 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
441 | // back trace for this cpu. | |
442 | ||
443 | if (rsp == NULL) { | |
444 | if (tsk) | |
445 | rsp = (unsigned long *)tsk->thread.rsp; | |
446 | else | |
447 | rsp = (unsigned long *)&rsp; | |
448 | } | |
449 | ||
450 | stack = rsp; | |
451 | for(i=0; i < kstack_depth_to_print; i++) { | |
452 | if (stack >= irqstack && stack <= irqstack_end) { | |
453 | if (stack == irqstack_end) { | |
454 | stack = (unsigned long *) (irqstack_end[-1]); | |
455 | printk(" <EOI> "); | |
456 | } | |
457 | } else { | |
458 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
459 | break; | |
460 | } | |
461 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
462 | printk("\n"); |
463 | printk(" %016lx", *stack++); | |
35faa714 | 464 | touch_nmi_watchdog(); |
1da177e4 | 465 | } |
b538ed27 JB |
466 | show_trace(tsk, regs, rsp); |
467 | } | |
468 | ||
469 | void show_stack(struct task_struct *tsk, unsigned long * rsp) | |
470 | { | |
471 | _show_stack(tsk, NULL, rsp); | |
1da177e4 LT |
472 | } |
473 | ||
474 | /* | |
475 | * The architecture-independent dump_stack generator | |
476 | */ | |
477 | void dump_stack(void) | |
478 | { | |
479 | unsigned long dummy; | |
b538ed27 | 480 | show_trace(NULL, NULL, &dummy); |
1da177e4 LT |
481 | } |
482 | ||
483 | EXPORT_SYMBOL(dump_stack); | |
484 | ||
485 | void show_registers(struct pt_regs *regs) | |
486 | { | |
487 | int i; | |
76381fee | 488 | int in_kernel = !user_mode(regs); |
1da177e4 | 489 | unsigned long rsp; |
151f8cc1 | 490 | const int cpu = smp_processor_id(); |
df79efde | 491 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 LT |
492 | |
493 | rsp = regs->rsp; | |
494 | ||
495 | printk("CPU %d ", cpu); | |
496 | __show_regs(regs); | |
497 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 498 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
499 | |
500 | /* | |
501 | * When in-kernel, we also print out the stack and code at the | |
502 | * time of the fault.. | |
503 | */ | |
504 | if (in_kernel) { | |
505 | ||
506 | printk("Stack: "); | |
b538ed27 | 507 | _show_stack(NULL, regs, (unsigned long*)rsp); |
1da177e4 LT |
508 | |
509 | printk("\nCode: "); | |
2b692a87 | 510 | if (regs->rip < PAGE_OFFSET) |
1da177e4 LT |
511 | goto bad; |
512 | ||
2b692a87 | 513 | for (i=0; i<20; i++) { |
1da177e4 | 514 | unsigned char c; |
2b692a87 | 515 | if (__get_user(c, &((unsigned char*)regs->rip)[i])) { |
1da177e4 LT |
516 | bad: |
517 | printk(" Bad RIP value."); | |
518 | break; | |
519 | } | |
520 | printk("%02x ", c); | |
521 | } | |
522 | } | |
523 | printk("\n"); | |
524 | } | |
525 | ||
526 | void handle_BUG(struct pt_regs *regs) | |
527 | { | |
528 | struct bug_frame f; | |
5f1d189f JB |
529 | long len; |
530 | const char *prefix = ""; | |
1da177e4 | 531 | |
76381fee | 532 | if (user_mode(regs)) |
1da177e4 | 533 | return; |
77a75333 | 534 | if (__copy_from_user(&f, (const void __user *) regs->rip, |
1da177e4 LT |
535 | sizeof(struct bug_frame))) |
536 | return; | |
049cdefe | 537 | if (f.filename >= 0 || |
1da177e4 LT |
538 | f.ud2[0] != 0x0f || f.ud2[1] != 0x0b) |
539 | return; | |
5f1d189f JB |
540 | len = __strnlen_user((char *)(long)f.filename, PATH_MAX) - 1; |
541 | if (len < 0 || len >= PATH_MAX) | |
049cdefe | 542 | f.filename = (int)(long)"unmapped filename"; |
5f1d189f JB |
543 | else if (len > 50) { |
544 | f.filename += len - 50; | |
545 | prefix = "..."; | |
546 | } | |
1da177e4 | 547 | printk("----------- [cut here ] --------- [please bite here ] ---------\n"); |
5f1d189f | 548 | printk(KERN_ALERT "Kernel BUG at %s%.50s:%d\n", prefix, (char *)(long)f.filename, f.line); |
1da177e4 LT |
549 | } |
550 | ||
4f60fdf6 | 551 | #ifdef CONFIG_BUG |
1da177e4 LT |
552 | void out_of_line_bug(void) |
553 | { | |
554 | BUG(); | |
555 | } | |
2ee60e17 | 556 | EXPORT_SYMBOL(out_of_line_bug); |
4f60fdf6 | 557 | #endif |
1da177e4 LT |
558 | |
559 | static DEFINE_SPINLOCK(die_lock); | |
560 | static int die_owner = -1; | |
cdc60a4c | 561 | static unsigned int die_nest_count; |
1da177e4 | 562 | |
eddb6fb9 | 563 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 564 | { |
151f8cc1 | 565 | int cpu = smp_processor_id(); |
1209140c JB |
566 | unsigned long flags; |
567 | ||
abf0f109 AM |
568 | oops_enter(); |
569 | ||
1209140c JB |
570 | /* racy, but better than risking deadlock. */ |
571 | local_irq_save(flags); | |
1da177e4 LT |
572 | if (!spin_trylock(&die_lock)) { |
573 | if (cpu == die_owner) | |
574 | /* nested oops. should stop eventually */; | |
575 | else | |
1209140c | 576 | spin_lock(&die_lock); |
1da177e4 | 577 | } |
cdc60a4c | 578 | die_nest_count++; |
1209140c | 579 | die_owner = cpu; |
1da177e4 | 580 | console_verbose(); |
1209140c JB |
581 | bust_spinlocks(1); |
582 | return flags; | |
1da177e4 LT |
583 | } |
584 | ||
eddb6fb9 | 585 | void __kprobes oops_end(unsigned long flags) |
1da177e4 LT |
586 | { |
587 | die_owner = -1; | |
1209140c | 588 | bust_spinlocks(0); |
cdc60a4c CM |
589 | die_nest_count--; |
590 | if (die_nest_count) | |
591 | /* We still own the lock */ | |
592 | local_irq_restore(flags); | |
593 | else | |
594 | /* Nest count reaches zero, release the lock. */ | |
595 | spin_unlock_irqrestore(&die_lock, flags); | |
1da177e4 | 596 | if (panic_on_oops) |
012c437d | 597 | panic("Fatal exception"); |
abf0f109 | 598 | oops_exit(); |
1209140c | 599 | } |
1da177e4 | 600 | |
eddb6fb9 | 601 | void __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
602 | { |
603 | static int die_counter; | |
604 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
605 | #ifdef CONFIG_PREEMPT | |
606 | printk("PREEMPT "); | |
607 | #endif | |
608 | #ifdef CONFIG_SMP | |
609 | printk("SMP "); | |
610 | #endif | |
611 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
612 | printk("DEBUG_PAGEALLOC"); | |
613 | #endif | |
614 | printk("\n"); | |
6e3f3617 | 615 | notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); |
1da177e4 LT |
616 | show_registers(regs); |
617 | /* Executive summary in case the oops scrolled away */ | |
618 | printk(KERN_ALERT "RIP "); | |
619 | printk_address(regs->rip); | |
620 | printk(" RSP <%016lx>\n", regs->rsp); | |
8bcc5280 VG |
621 | if (kexec_should_crash(current)) |
622 | crash_kexec(regs); | |
1da177e4 LT |
623 | } |
624 | ||
625 | void die(const char * str, struct pt_regs * regs, long err) | |
626 | { | |
1209140c JB |
627 | unsigned long flags = oops_begin(); |
628 | ||
1da177e4 LT |
629 | handle_BUG(regs); |
630 | __die(str, regs, err); | |
1209140c | 631 | oops_end(flags); |
1da177e4 LT |
632 | do_exit(SIGSEGV); |
633 | } | |
1da177e4 | 634 | |
fac58550 | 635 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 636 | { |
1209140c JB |
637 | unsigned long flags = oops_begin(); |
638 | ||
1da177e4 LT |
639 | /* |
640 | * We are in trouble anyway, lets at least try | |
641 | * to get a message out. | |
642 | */ | |
151f8cc1 | 643 | printk(str, smp_processor_id()); |
1da177e4 | 644 | show_registers(regs); |
8bcc5280 VG |
645 | if (kexec_should_crash(current)) |
646 | crash_kexec(regs); | |
fac58550 AK |
647 | if (do_panic || panic_on_oops) |
648 | panic("Non maskable interrupt"); | |
1209140c | 649 | oops_end(flags); |
8b1ffe95 CM |
650 | nmi_exit(); |
651 | local_irq_enable(); | |
1da177e4 LT |
652 | do_exit(SIGSEGV); |
653 | } | |
654 | ||
0f2fbdcb PP |
655 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
656 | struct pt_regs * regs, long error_code, | |
657 | siginfo_t *info) | |
1da177e4 | 658 | { |
6e3f3617 JB |
659 | struct task_struct *tsk = current; |
660 | ||
6e3f3617 JB |
661 | tsk->thread.error_code = error_code; |
662 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 663 | |
6e3f3617 | 664 | if (user_mode(regs)) { |
1da177e4 LT |
665 | if (exception_trace && unhandled_signal(tsk, signr)) |
666 | printk(KERN_INFO | |
667 | "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n", | |
668 | tsk->comm, tsk->pid, str, | |
2b692a87 | 669 | regs->rip, regs->rsp, error_code); |
1da177e4 | 670 | |
1da177e4 LT |
671 | if (info) |
672 | force_sig_info(signr, info, tsk); | |
673 | else | |
674 | force_sig(signr, tsk); | |
675 | return; | |
676 | } | |
677 | ||
678 | ||
679 | /* kernel trap */ | |
680 | { | |
681 | const struct exception_table_entry *fixup; | |
682 | fixup = search_exception_tables(regs->rip); | |
2b692a87 | 683 | if (fixup) |
1da177e4 | 684 | regs->rip = fixup->fixup; |
2b692a87 | 685 | else |
1da177e4 LT |
686 | die(str, regs, error_code); |
687 | return; | |
688 | } | |
689 | } | |
690 | ||
691 | #define DO_ERROR(trapnr, signr, str, name) \ | |
692 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
693 | { \ | |
694 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
695 | == NOTIFY_STOP) \ | |
696 | return; \ | |
40e59a61 | 697 | conditional_sti(regs); \ |
1da177e4 LT |
698 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
699 | } | |
700 | ||
701 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
702 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
703 | { \ | |
704 | siginfo_t info; \ | |
705 | info.si_signo = signr; \ | |
706 | info.si_errno = 0; \ | |
707 | info.si_code = sicode; \ | |
708 | info.si_addr = (void __user *)siaddr; \ | |
709 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
710 | == NOTIFY_STOP) \ | |
711 | return; \ | |
40e59a61 | 712 | conditional_sti(regs); \ |
1da177e4 LT |
713 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
714 | } | |
715 | ||
716 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip) | |
717 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) | |
718 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
100c0e36 | 719 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip) |
1da177e4 LT |
720 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
721 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
722 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
723 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
724 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
725 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
726 | |
727 | /* Runs on IST stack */ | |
728 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
729 | { | |
730 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
731 | 12, SIGBUS) == NOTIFY_STOP) | |
732 | return; | |
733 | preempt_conditional_sti(regs); | |
734 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
735 | preempt_conditional_cli(regs); | |
736 | } | |
eca37c18 JB |
737 | |
738 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
739 | { | |
740 | static const char str[] = "double fault"; | |
741 | struct task_struct *tsk = current; | |
742 | ||
743 | /* Return not checked because double check cannot be ignored */ | |
744 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
745 | ||
746 | tsk->thread.error_code = error_code; | |
747 | tsk->thread.trap_no = 8; | |
748 | ||
749 | /* This is always a kernel trap and never fixable (and thus must | |
750 | never return). */ | |
751 | for (;;) | |
752 | die(str, regs, error_code); | |
753 | } | |
1da177e4 | 754 | |
0f2fbdcb PP |
755 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
756 | long error_code) | |
1da177e4 | 757 | { |
6e3f3617 JB |
758 | struct task_struct *tsk = current; |
759 | ||
1da177e4 LT |
760 | conditional_sti(regs); |
761 | ||
6e3f3617 JB |
762 | tsk->thread.error_code = error_code; |
763 | tsk->thread.trap_no = 13; | |
1da177e4 | 764 | |
6e3f3617 | 765 | if (user_mode(regs)) { |
1da177e4 LT |
766 | if (exception_trace && unhandled_signal(tsk, SIGSEGV)) |
767 | printk(KERN_INFO | |
768 | "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n", | |
769 | tsk->comm, tsk->pid, | |
2b692a87 | 770 | regs->rip, regs->rsp, error_code); |
1da177e4 | 771 | |
1da177e4 LT |
772 | force_sig(SIGSEGV, tsk); |
773 | return; | |
774 | } | |
775 | ||
776 | /* kernel gp */ | |
777 | { | |
778 | const struct exception_table_entry *fixup; | |
779 | fixup = search_exception_tables(regs->rip); | |
780 | if (fixup) { | |
781 | regs->rip = fixup->fixup; | |
782 | return; | |
783 | } | |
784 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
785 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
786 | return; | |
787 | die("general protection fault", regs, error_code); | |
788 | } | |
789 | } | |
790 | ||
eddb6fb9 AK |
791 | static __kprobes void |
792 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 793 | { |
c41c5cd3 DZ |
794 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
795 | reason); | |
9c5f8be4 | 796 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 797 | |
8da5adda | 798 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
799 | panic("NMI: Not continuing"); |
800 | ||
801 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
802 | |
803 | /* Clear and disable the memory parity error line. */ | |
804 | reason = (reason & 0xf) | 4; | |
805 | outb(reason, 0x61); | |
806 | } | |
807 | ||
eddb6fb9 AK |
808 | static __kprobes void |
809 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
810 | { |
811 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
812 | show_registers(regs); | |
813 | ||
814 | /* Re-enable the IOCK line, wait for a few seconds */ | |
815 | reason = (reason & 0xf) | 8; | |
816 | outb(reason, 0x61); | |
817 | mdelay(2000); | |
818 | reason &= ~8; | |
819 | outb(reason, 0x61); | |
820 | } | |
821 | ||
eddb6fb9 AK |
822 | static __kprobes void |
823 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 DZ |
824 | { |
825 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", | |
826 | reason); | |
827 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
828 | |
829 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 830 | panic("NMI: Not continuing"); |
8da5adda | 831 | |
c41c5cd3 | 832 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
833 | } |
834 | ||
6fefb0d1 AK |
835 | /* Runs on IST stack. This code must keep interrupts off all the time. |
836 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 837 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
838 | { |
839 | unsigned char reason = 0; | |
76e4f660 AR |
840 | int cpu; |
841 | ||
842 | cpu = smp_processor_id(); | |
1da177e4 LT |
843 | |
844 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 845 | if (!cpu) |
1da177e4 LT |
846 | reason = get_nmi_reason(); |
847 | ||
848 | if (!(reason & 0xc0)) { | |
6e3f3617 | 849 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
850 | == NOTIFY_STOP) |
851 | return; | |
1da177e4 LT |
852 | /* |
853 | * Ok, so this is none of the documented NMI sources, | |
854 | * so it must be the NMI watchdog. | |
855 | */ | |
3adbbcce | 856 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 857 | return; |
3adbbcce | 858 | if (!do_nmi_callback(regs,cpu)) |
3adbbcce DZ |
859 | unknown_nmi_error(reason, regs); |
860 | ||
1da177e4 LT |
861 | return; |
862 | } | |
6e3f3617 | 863 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
864 | return; |
865 | ||
866 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
867 | ||
868 | if (reason & 0x80) | |
869 | mem_parity_error(reason, regs); | |
870 | if (reason & 0x40) | |
871 | io_check_error(reason, regs); | |
872 | } | |
873 | ||
b556b35e | 874 | /* runs on IST stack. */ |
0f2fbdcb | 875 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 LT |
876 | { |
877 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { | |
878 | return; | |
879 | } | |
40e59a61 | 880 | preempt_conditional_sti(regs); |
1da177e4 | 881 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 882 | preempt_conditional_cli(regs); |
1da177e4 LT |
883 | } |
884 | ||
6fefb0d1 AK |
885 | /* Help handler running on IST stack to switch back to user stack |
886 | for scheduling or signal handling. The actual stack switch is done in | |
887 | entry.S */ | |
eddb6fb9 | 888 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
889 | { |
890 | struct pt_regs *regs = eregs; | |
891 | /* Did already sync */ | |
892 | if (eregs == (struct pt_regs *)eregs->rsp) | |
893 | ; | |
894 | /* Exception from user space */ | |
76381fee | 895 | else if (user_mode(eregs)) |
bb049232 | 896 | regs = task_pt_regs(current); |
6fefb0d1 AK |
897 | /* Exception from kernel and interrupts are enabled. Move to |
898 | kernel process stack. */ | |
899 | else if (eregs->eflags & X86_EFLAGS_IF) | |
900 | regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs)); | |
901 | if (eregs != regs) | |
902 | *regs = *eregs; | |
903 | return regs; | |
904 | } | |
905 | ||
1da177e4 | 906 | /* runs on IST stack. */ |
0f2fbdcb PP |
907 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
908 | unsigned long error_code) | |
1da177e4 | 909 | { |
1da177e4 LT |
910 | unsigned long condition; |
911 | struct task_struct *tsk = current; | |
912 | siginfo_t info; | |
913 | ||
e9129e56 | 914 | get_debugreg(condition, 6); |
1da177e4 LT |
915 | |
916 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, | |
daeeafec | 917 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 918 | return; |
daeeafec | 919 | |
a65d17c9 | 920 | preempt_conditional_sti(regs); |
1da177e4 LT |
921 | |
922 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
923 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
924 | if (!tsk->thread.debugreg7) { | |
925 | goto clear_dr7; | |
926 | } | |
927 | } | |
928 | ||
929 | tsk->thread.debugreg6 = condition; | |
930 | ||
931 | /* Mask out spurious TF errors due to lazy TF clearing */ | |
daeeafec | 932 | if (condition & DR_STEP) { |
1da177e4 LT |
933 | /* |
934 | * The TF error should be masked out only if the current | |
935 | * process is not traced and if the TRAP flag has been set | |
936 | * previously by a tracing process (condition detected by | |
937 | * the PT_DTRACE flag); remember that the i386 TRAP flag | |
938 | * can be modified by the process itself in user mode, | |
939 | * allowing programs to debug themselves without the ptrace() | |
940 | * interface. | |
941 | */ | |
76381fee | 942 | if (!user_mode(regs)) |
1da177e4 | 943 | goto clear_TF_reenable; |
be61bff7 AK |
944 | /* |
945 | * Was the TF flag set by a debugger? If so, clear it now, | |
946 | * so that register information is correct. | |
947 | */ | |
948 | if (tsk->ptrace & PT_DTRACE) { | |
949 | regs->eflags &= ~TF_MASK; | |
950 | tsk->ptrace &= ~PT_DTRACE; | |
951 | } | |
1da177e4 LT |
952 | } |
953 | ||
954 | /* Ok, finally something we can handle */ | |
955 | tsk->thread.trap_no = 1; | |
956 | tsk->thread.error_code = error_code; | |
957 | info.si_signo = SIGTRAP; | |
958 | info.si_errno = 0; | |
959 | info.si_code = TRAP_BRKPT; | |
01b8faae JB |
960 | info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL; |
961 | force_sig_info(SIGTRAP, &info, tsk); | |
1da177e4 | 962 | |
1da177e4 | 963 | clear_dr7: |
e9129e56 | 964 | set_debugreg(0UL, 7); |
a65d17c9 | 965 | preempt_conditional_cli(regs); |
6fefb0d1 | 966 | return; |
1da177e4 LT |
967 | |
968 | clear_TF_reenable: | |
969 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
1da177e4 | 970 | regs->eflags &= ~TF_MASK; |
a65d17c9 | 971 | preempt_conditional_cli(regs); |
1da177e4 LT |
972 | } |
973 | ||
6e3f3617 | 974 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 LT |
975 | { |
976 | const struct exception_table_entry *fixup; | |
977 | fixup = search_exception_tables(regs->rip); | |
978 | if (fixup) { | |
979 | regs->rip = fixup->fixup; | |
980 | return 1; | |
981 | } | |
6e3f3617 | 982 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 983 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 984 | current->thread.trap_no = trapnr; |
1da177e4 | 985 | die(str, regs, 0); |
1da177e4 LT |
986 | return 0; |
987 | } | |
988 | ||
989 | /* | |
990 | * Note that we play around with the 'TS' bit in an attempt to get | |
991 | * the correct behaviour even in the presence of the asynchronous | |
992 | * IRQ13 behaviour | |
993 | */ | |
994 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
995 | { | |
996 | void __user *rip = (void __user *)(regs->rip); | |
997 | struct task_struct * task; | |
998 | siginfo_t info; | |
999 | unsigned short cwd, swd; | |
1000 | ||
1001 | conditional_sti(regs); | |
76381fee | 1002 | if (!user_mode(regs) && |
6e3f3617 | 1003 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
1004 | return; |
1005 | ||
1006 | /* | |
1007 | * Save the info for the exception handler and clear the error. | |
1008 | */ | |
1009 | task = current; | |
1010 | save_init_fpu(task); | |
1011 | task->thread.trap_no = 16; | |
1012 | task->thread.error_code = 0; | |
1013 | info.si_signo = SIGFPE; | |
1014 | info.si_errno = 0; | |
1015 | info.si_code = __SI_FAULT; | |
1016 | info.si_addr = rip; | |
1017 | /* | |
1018 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
1019 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
1020 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
1021 | * fault bit. We should only be taking one exception at a time, | |
1022 | * so if this combination doesn't produce any single exception, | |
1023 | * then we have a bad program that isn't synchronizing its FPU usage | |
1024 | * and it will suffer the consequences since we won't be able to | |
1025 | * fully reproduce the context of the exception | |
1026 | */ | |
1027 | cwd = get_fpu_cwd(task); | |
1028 | swd = get_fpu_swd(task); | |
ff347b22 | 1029 | switch (swd & ~cwd & 0x3f) { |
1da177e4 LT |
1030 | case 0x000: |
1031 | default: | |
1032 | break; | |
1033 | case 0x001: /* Invalid Op */ | |
ff347b22 CE |
1034 | /* |
1035 | * swd & 0x240 == 0x040: Stack Underflow | |
1036 | * swd & 0x240 == 0x240: Stack Overflow | |
1037 | * User must clear the SF bit (0x40) if set | |
1038 | */ | |
1da177e4 LT |
1039 | info.si_code = FPE_FLTINV; |
1040 | break; | |
1041 | case 0x002: /* Denormalize */ | |
1042 | case 0x010: /* Underflow */ | |
1043 | info.si_code = FPE_FLTUND; | |
1044 | break; | |
1045 | case 0x004: /* Zero Divide */ | |
1046 | info.si_code = FPE_FLTDIV; | |
1047 | break; | |
1048 | case 0x008: /* Overflow */ | |
1049 | info.si_code = FPE_FLTOVF; | |
1050 | break; | |
1051 | case 0x020: /* Precision */ | |
1052 | info.si_code = FPE_FLTRES; | |
1053 | break; | |
1054 | } | |
1055 | force_sig_info(SIGFPE, &info, task); | |
1056 | } | |
1057 | ||
1058 | asmlinkage void bad_intr(void) | |
1059 | { | |
1060 | printk("bad interrupt"); | |
1061 | } | |
1062 | ||
1063 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
1064 | { | |
1065 | void __user *rip = (void __user *)(regs->rip); | |
1066 | struct task_struct * task; | |
1067 | siginfo_t info; | |
1068 | unsigned short mxcsr; | |
1069 | ||
1070 | conditional_sti(regs); | |
76381fee | 1071 | if (!user_mode(regs) && |
6e3f3617 | 1072 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
1073 | return; |
1074 | ||
1075 | /* | |
1076 | * Save the info for the exception handler and clear the error. | |
1077 | */ | |
1078 | task = current; | |
1079 | save_init_fpu(task); | |
1080 | task->thread.trap_no = 19; | |
1081 | task->thread.error_code = 0; | |
1082 | info.si_signo = SIGFPE; | |
1083 | info.si_errno = 0; | |
1084 | info.si_code = __SI_FAULT; | |
1085 | info.si_addr = rip; | |
1086 | /* | |
1087 | * The SIMD FPU exceptions are handled a little differently, as there | |
1088 | * is only a single status/control register. Thus, to determine which | |
1089 | * unmasked exception was caught we must mask the exception mask bits | |
1090 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1091 | */ | |
1092 | mxcsr = get_fpu_mxcsr(task); | |
1093 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
1094 | case 0x000: | |
1095 | default: | |
1096 | break; | |
1097 | case 0x001: /* Invalid Op */ | |
1098 | info.si_code = FPE_FLTINV; | |
1099 | break; | |
1100 | case 0x002: /* Denormalize */ | |
1101 | case 0x010: /* Underflow */ | |
1102 | info.si_code = FPE_FLTUND; | |
1103 | break; | |
1104 | case 0x004: /* Zero Divide */ | |
1105 | info.si_code = FPE_FLTDIV; | |
1106 | break; | |
1107 | case 0x008: /* Overflow */ | |
1108 | info.si_code = FPE_FLTOVF; | |
1109 | break; | |
1110 | case 0x020: /* Precision */ | |
1111 | info.si_code = FPE_FLTRES; | |
1112 | break; | |
1113 | } | |
1114 | force_sig_info(SIGFPE, &info, task); | |
1115 | } | |
1116 | ||
1117 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1118 | { | |
1119 | } | |
1120 | ||
1121 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1122 | { |
1123 | } | |
1124 | ||
1125 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1126 | { |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * 'math_state_restore()' saves the current math information in the | |
1131 | * old math state array, and gets the new ones from the current task | |
1132 | * | |
1133 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1134 | * Don't touch unless you *really* know how it works. | |
1135 | */ | |
1136 | asmlinkage void math_state_restore(void) | |
1137 | { | |
1138 | struct task_struct *me = current; | |
1139 | clts(); /* Allow maths ops (or we recurse) */ | |
1140 | ||
1141 | if (!used_math()) | |
1142 | init_fpu(me); | |
1143 | restore_fpu_checking(&me->thread.i387.fxsave); | |
e4f17c43 | 1144 | task_thread_info(me)->status |= TS_USEDFPU; |
e07e23e1 | 1145 | me->fpu_counter++; |
1da177e4 LT |
1146 | } |
1147 | ||
1da177e4 LT |
1148 | void __init trap_init(void) |
1149 | { | |
1150 | set_intr_gate(0,÷_error); | |
1151 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1152 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1153 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1154 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1155 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1156 | set_intr_gate(6,&invalid_op); |
1157 | set_intr_gate(7,&device_not_available); | |
1158 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1159 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1160 | set_intr_gate(10,&invalid_TSS); | |
1161 | set_intr_gate(11,&segment_not_present); | |
1162 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1163 | set_intr_gate(13,&general_protection); | |
1164 | set_intr_gate(14,&page_fault); | |
1165 | set_intr_gate(15,&spurious_interrupt_bug); | |
1166 | set_intr_gate(16,&coprocessor_error); | |
1167 | set_intr_gate(17,&alignment_check); | |
1168 | #ifdef CONFIG_X86_MCE | |
1169 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1170 | #endif | |
1171 | set_intr_gate(19,&simd_coprocessor_error); | |
1172 | ||
1173 | #ifdef CONFIG_IA32_EMULATION | |
1174 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1175 | #endif | |
1176 | ||
1da177e4 LT |
1177 | /* |
1178 | * Should be a barrier for any external CPU state. | |
1179 | */ | |
1180 | cpu_init(); | |
1181 | } | |
1182 | ||
1183 | ||
2c8c0e6b | 1184 | static int __init oops_setup(char *s) |
1da177e4 | 1185 | { |
2c8c0e6b AK |
1186 | if (!s) |
1187 | return -EINVAL; | |
1188 | if (!strcmp(s, "panic")) | |
1189 | panic_on_oops = 1; | |
1190 | return 0; | |
1da177e4 | 1191 | } |
2c8c0e6b | 1192 | early_param("oops", oops_setup); |
1da177e4 LT |
1193 | |
1194 | static int __init kstack_setup(char *s) | |
1195 | { | |
2c8c0e6b AK |
1196 | if (!s) |
1197 | return -EINVAL; | |
1da177e4 | 1198 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
2c8c0e6b | 1199 | return 0; |
1da177e4 | 1200 | } |
2c8c0e6b | 1201 | early_param("kstack", kstack_setup); |
1da177e4 | 1202 | |
ea424055 | 1203 | #ifdef CONFIG_STACK_UNWIND |
c33bd9aa JB |
1204 | static int __init call_trace_setup(char *s) |
1205 | { | |
2c8c0e6b AK |
1206 | if (!s) |
1207 | return -EINVAL; | |
c33bd9aa JB |
1208 | if (strcmp(s, "old") == 0) |
1209 | call_trace = -1; | |
1210 | else if (strcmp(s, "both") == 0) | |
1211 | call_trace = 0; | |
b13761ec | 1212 | else if (strcmp(s, "newfallback") == 0) |
c33bd9aa | 1213 | call_trace = 1; |
b13761ec AK |
1214 | else if (strcmp(s, "new") == 0) |
1215 | call_trace = 2; | |
2c8c0e6b | 1216 | return 0; |
c33bd9aa | 1217 | } |
2c8c0e6b | 1218 | early_param("call_trace", call_trace_setup); |
ea424055 | 1219 | #endif |