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> |
c31a0bf3 | 34 | #include <linux/bug.h> |
1da177e4 LT |
35 | |
36 | #include <asm/system.h> | |
1da177e4 LT |
37 | #include <asm/io.h> |
38 | #include <asm/atomic.h> | |
39 | #include <asm/debugreg.h> | |
40 | #include <asm/desc.h> | |
41 | #include <asm/i387.h> | |
42 | #include <asm/kdebug.h> | |
43 | #include <asm/processor.h> | |
b538ed27 | 44 | #include <asm/unwind.h> |
1da177e4 LT |
45 | #include <asm/smp.h> |
46 | #include <asm/pgalloc.h> | |
47 | #include <asm/pda.h> | |
48 | #include <asm/proto.h> | |
49 | #include <asm/nmi.h> | |
c0b766f1 | 50 | #include <asm/stacktrace.h> |
1da177e4 | 51 | |
1da177e4 LT |
52 | asmlinkage void divide_error(void); |
53 | asmlinkage void debug(void); | |
54 | asmlinkage void nmi(void); | |
55 | asmlinkage void int3(void); | |
56 | asmlinkage void overflow(void); | |
57 | asmlinkage void bounds(void); | |
58 | asmlinkage void invalid_op(void); | |
59 | asmlinkage void device_not_available(void); | |
60 | asmlinkage void double_fault(void); | |
61 | asmlinkage void coprocessor_segment_overrun(void); | |
62 | asmlinkage void invalid_TSS(void); | |
63 | asmlinkage void segment_not_present(void); | |
64 | asmlinkage void stack_segment(void); | |
65 | asmlinkage void general_protection(void); | |
66 | asmlinkage void page_fault(void); | |
67 | asmlinkage void coprocessor_error(void); | |
68 | asmlinkage void simd_coprocessor_error(void); | |
69 | asmlinkage void reserved(void); | |
70 | asmlinkage void alignment_check(void); | |
71 | asmlinkage void machine_check(void); | |
72 | asmlinkage void spurious_interrupt_bug(void); | |
1da177e4 | 73 | |
e041c683 | 74 | ATOMIC_NOTIFIER_HEAD(die_chain); |
2ee60e17 | 75 | EXPORT_SYMBOL(die_chain); |
1da177e4 LT |
76 | |
77 | int register_die_notifier(struct notifier_block *nb) | |
78 | { | |
8c914cb7 | 79 | vmalloc_sync_all(); |
e041c683 AS |
80 | return atomic_notifier_chain_register(&die_chain, nb); |
81 | } | |
1454aed9 | 82 | EXPORT_SYMBOL(register_die_notifier); /* used modular by kdb */ |
e041c683 AS |
83 | |
84 | int unregister_die_notifier(struct notifier_block *nb) | |
85 | { | |
86 | return atomic_notifier_chain_unregister(&die_chain, nb); | |
1da177e4 | 87 | } |
1454aed9 | 88 | EXPORT_SYMBOL(unregister_die_notifier); /* used modular by kdb */ |
1da177e4 LT |
89 | |
90 | static inline void conditional_sti(struct pt_regs *regs) | |
91 | { | |
92 | if (regs->eflags & X86_EFLAGS_IF) | |
93 | local_irq_enable(); | |
94 | } | |
95 | ||
a65d17c9 JB |
96 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
97 | { | |
98 | preempt_disable(); | |
99 | if (regs->eflags & X86_EFLAGS_IF) | |
100 | local_irq_enable(); | |
101 | } | |
102 | ||
103 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
104 | { | |
105 | if (regs->eflags & X86_EFLAGS_IF) | |
106 | local_irq_disable(); | |
40e59a61 AK |
107 | /* Make sure to not schedule here because we could be running |
108 | on an exception stack. */ | |
a65d17c9 JB |
109 | preempt_enable_no_resched(); |
110 | } | |
111 | ||
0741f4d2 | 112 | int kstack_depth_to_print = 12; |
1da177e4 LT |
113 | |
114 | #ifdef CONFIG_KALLSYMS | |
3ac94932 IM |
115 | void printk_address(unsigned long address) |
116 | { | |
1da177e4 LT |
117 | unsigned long offset = 0, symsize; |
118 | const char *symname; | |
119 | char *modname; | |
3ac94932 | 120 | char *delim = ":"; |
1da177e4 LT |
121 | char namebuf[128]; |
122 | ||
3ac94932 IM |
123 | symname = kallsyms_lookup(address, &symsize, &offset, |
124 | &modname, namebuf); | |
125 | if (!symname) { | |
126 | printk(" [<%016lx>]\n", address); | |
127 | return; | |
128 | } | |
129 | if (!modname) | |
1da177e4 | 130 | modname = delim = ""; |
3ac94932 IM |
131 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
132 | address, delim, modname, delim, symname, offset, symsize); | |
133 | } | |
1da177e4 | 134 | #else |
3ac94932 IM |
135 | void printk_address(unsigned long address) |
136 | { | |
137 | printk(" [<%016lx>]\n", address); | |
138 | } | |
1da177e4 LT |
139 | #endif |
140 | ||
0a658002 | 141 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 142 | unsigned *usedp, char **idp) |
0a658002 | 143 | { |
b556b35e | 144 | static char ids[][8] = { |
0a658002 AK |
145 | [DEBUG_STACK - 1] = "#DB", |
146 | [NMI_STACK - 1] = "NMI", | |
147 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
148 | [STACKFAULT_STACK - 1] = "#SS", | |
149 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
150 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
151 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
152 | #endif | |
0a658002 AK |
153 | }; |
154 | unsigned k; | |
1da177e4 | 155 | |
c9ca1ba5 IM |
156 | /* |
157 | * Iterate over all exception stacks, and figure out whether | |
158 | * 'stack' is in one of them: | |
159 | */ | |
0a658002 | 160 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 161 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
162 | /* |
163 | * Is 'stack' above this exception frame's end? | |
164 | * If yes then skip to the next frame. | |
165 | */ | |
0a658002 AK |
166 | if (stack >= end) |
167 | continue; | |
c9ca1ba5 IM |
168 | /* |
169 | * Is 'stack' above this exception frame's start address? | |
170 | * If yes then we found the right frame. | |
171 | */ | |
0a658002 | 172 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
173 | /* |
174 | * Make sure we only iterate through an exception | |
175 | * stack once. If it comes up for the second time | |
176 | * then there's something wrong going on - just | |
177 | * break out and return NULL: | |
178 | */ | |
0a658002 AK |
179 | if (*usedp & (1U << k)) |
180 | break; | |
181 | *usedp |= 1U << k; | |
182 | *idp = ids[k]; | |
183 | return (unsigned long *)end; | |
184 | } | |
c9ca1ba5 IM |
185 | /* |
186 | * If this is a debug stack, and if it has a larger size than | |
187 | * the usual exception stacks, then 'stack' might still | |
188 | * be within the lower portion of the debug stack: | |
189 | */ | |
b556b35e JB |
190 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
191 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
192 | unsigned j = N_EXCEPTION_STACKS - 1; | |
193 | ||
c9ca1ba5 IM |
194 | /* |
195 | * Black magic. A large debug stack is composed of | |
196 | * multiple exception stack entries, which we | |
197 | * iterate through now. Dont look: | |
198 | */ | |
b556b35e JB |
199 | do { |
200 | ++j; | |
201 | end -= EXCEPTION_STKSZ; | |
202 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
203 | } while (stack < end - EXCEPTION_STKSZ); | |
204 | if (*usedp & (1U << j)) | |
205 | break; | |
206 | *usedp |= 1U << j; | |
207 | *idp = ids[j]; | |
208 | return (unsigned long *)end; | |
209 | } | |
210 | #endif | |
1da177e4 LT |
211 | } |
212 | return NULL; | |
0a658002 | 213 | } |
1da177e4 | 214 | |
b615ebda AK |
215 | #define MSG(txt) ops->warning(data, txt) |
216 | ||
1da177e4 LT |
217 | /* |
218 | * x86-64 can have upto three kernel stacks: | |
219 | * process stack | |
220 | * interrupt stack | |
0a658002 | 221 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
222 | */ |
223 | ||
c547c77e AK |
224 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
225 | { | |
226 | void *t = (void *)tinfo; | |
227 | return p > t && p < t + THREAD_SIZE - 3; | |
228 | } | |
229 | ||
b615ebda AK |
230 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
231 | unsigned long *stack, | |
c0b766f1 | 232 | struct stacktrace_ops *ops, void *data) |
1da177e4 | 233 | { |
da68933e | 234 | const unsigned cpu = get_cpu(); |
b615ebda | 235 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 236 | unsigned used = 0; |
c547c77e | 237 | struct thread_info *tinfo; |
1da177e4 | 238 | |
b538ed27 JB |
239 | if (!tsk) |
240 | tsk = current; | |
241 | ||
c0b766f1 AK |
242 | if (!stack) { |
243 | unsigned long dummy; | |
244 | stack = &dummy; | |
245 | if (tsk && tsk != current) | |
246 | stack = (unsigned long *)tsk->thread.rsp; | |
b538ed27 JB |
247 | } |
248 | ||
c9ca1ba5 IM |
249 | /* |
250 | * Print function call entries within a stack. 'cond' is the | |
251 | * "end of stackframe" condition, that the 'stack++' | |
252 | * iteration will eventually trigger. | |
253 | */ | |
0a658002 AK |
254 | #define HANDLE_STACK(cond) \ |
255 | do while (cond) { \ | |
1b2f6304 | 256 | unsigned long addr = *stack++; \ |
446f713b AK |
257 | /* Use unlocked access here because except for NMIs \ |
258 | we should be already protected against module unloads */ \ | |
259 | if (__kernel_text_address(addr)) { \ | |
0a658002 AK |
260 | /* \ |
261 | * If the address is either in the text segment of the \ | |
262 | * kernel, or in the region which contains vmalloc'ed \ | |
263 | * memory, it *may* be the address of a calling \ | |
264 | * routine; if so, print it so that someone tracing \ | |
265 | * down the cause of the crash will be able to figure \ | |
266 | * out the call path that was taken. \ | |
267 | */ \ | |
c0b766f1 | 268 | ops->address(data, addr); \ |
0a658002 AK |
269 | } \ |
270 | } while (0) | |
271 | ||
c9ca1ba5 IM |
272 | /* |
273 | * Print function call entries in all stacks, starting at the | |
274 | * current stack address. If the stacks consist of nested | |
275 | * exceptions | |
276 | */ | |
c0b766f1 AK |
277 | for (;;) { |
278 | char *id; | |
0a658002 AK |
279 | unsigned long *estack_end; |
280 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
281 | &used, &id); | |
282 | ||
283 | if (estack_end) { | |
c0b766f1 AK |
284 | if (ops->stack(data, id) < 0) |
285 | break; | |
0a658002 | 286 | HANDLE_STACK (stack < estack_end); |
c0b766f1 | 287 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
288 | /* |
289 | * We link to the next stack via the | |
290 | * second-to-last pointer (index -2 to end) in the | |
291 | * exception stack: | |
292 | */ | |
0a658002 AK |
293 | stack = (unsigned long *) estack_end[-2]; |
294 | continue; | |
1da177e4 | 295 | } |
0a658002 AK |
296 | if (irqstack_end) { |
297 | unsigned long *irqstack; | |
298 | irqstack = irqstack_end - | |
299 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
300 | ||
301 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
302 | if (ops->stack(data, "IRQ") < 0) |
303 | break; | |
0a658002 | 304 | HANDLE_STACK (stack < irqstack_end); |
c9ca1ba5 IM |
305 | /* |
306 | * We link to the next stack (which would be | |
307 | * the process stack normally) the last | |
308 | * pointer (index -1 to end) in the IRQ stack: | |
309 | */ | |
0a658002 AK |
310 | stack = (unsigned long *) (irqstack_end[-1]); |
311 | irqstack_end = NULL; | |
c0b766f1 | 312 | ops->stack(data, "EOI"); |
0a658002 | 313 | continue; |
1da177e4 | 314 | } |
1da177e4 | 315 | } |
0a658002 | 316 | break; |
1da177e4 | 317 | } |
0a658002 | 318 | |
c9ca1ba5 | 319 | /* |
c0b766f1 | 320 | * This handles the process stack: |
c9ca1ba5 | 321 | */ |
c547c77e AK |
322 | tinfo = current_thread_info(); |
323 | HANDLE_STACK (valid_stack_ptr(tinfo, stack)); | |
0a658002 | 324 | #undef HANDLE_STACK |
da68933e | 325 | put_cpu(); |
c0b766f1 AK |
326 | } |
327 | EXPORT_SYMBOL(dump_trace); | |
328 | ||
329 | static void | |
330 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
331 | { | |
332 | print_symbol(msg, symbol); | |
333 | printk("\n"); | |
334 | } | |
335 | ||
336 | static void print_trace_warning(void *data, char *msg) | |
337 | { | |
338 | printk("%s\n", msg); | |
339 | } | |
340 | ||
341 | static int print_trace_stack(void *data, char *name) | |
342 | { | |
343 | printk(" <%s> ", name); | |
344 | return 0; | |
345 | } | |
3ac94932 | 346 | |
c0b766f1 AK |
347 | static void print_trace_address(void *data, unsigned long addr) |
348 | { | |
349 | printk_address(addr); | |
350 | } | |
351 | ||
352 | static struct stacktrace_ops print_trace_ops = { | |
353 | .warning = print_trace_warning, | |
354 | .warning_symbol = print_trace_warning_symbol, | |
355 | .stack = print_trace_stack, | |
356 | .address = print_trace_address, | |
357 | }; | |
358 | ||
359 | void | |
360 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) | |
361 | { | |
362 | printk("\nCall Trace:\n"); | |
363 | dump_trace(tsk, regs, stack, &print_trace_ops, NULL); | |
1da177e4 LT |
364 | printk("\n"); |
365 | } | |
366 | ||
c0b766f1 AK |
367 | static void |
368 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp) | |
1da177e4 LT |
369 | { |
370 | unsigned long *stack; | |
371 | int i; | |
151f8cc1 | 372 | const int cpu = smp_processor_id(); |
df79efde RT |
373 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
374 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
375 | |
376 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
377 | // back trace for this cpu. | |
378 | ||
379 | if (rsp == NULL) { | |
380 | if (tsk) | |
381 | rsp = (unsigned long *)tsk->thread.rsp; | |
382 | else | |
383 | rsp = (unsigned long *)&rsp; | |
384 | } | |
385 | ||
386 | stack = rsp; | |
387 | for(i=0; i < kstack_depth_to_print; i++) { | |
388 | if (stack >= irqstack && stack <= irqstack_end) { | |
389 | if (stack == irqstack_end) { | |
390 | stack = (unsigned long *) (irqstack_end[-1]); | |
391 | printk(" <EOI> "); | |
392 | } | |
393 | } else { | |
394 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
395 | break; | |
396 | } | |
397 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
398 | printk("\n"); |
399 | printk(" %016lx", *stack++); | |
35faa714 | 400 | touch_nmi_watchdog(); |
1da177e4 | 401 | } |
b538ed27 JB |
402 | show_trace(tsk, regs, rsp); |
403 | } | |
404 | ||
405 | void show_stack(struct task_struct *tsk, unsigned long * rsp) | |
406 | { | |
407 | _show_stack(tsk, NULL, rsp); | |
1da177e4 LT |
408 | } |
409 | ||
410 | /* | |
411 | * The architecture-independent dump_stack generator | |
412 | */ | |
413 | void dump_stack(void) | |
414 | { | |
415 | unsigned long dummy; | |
b538ed27 | 416 | show_trace(NULL, NULL, &dummy); |
1da177e4 LT |
417 | } |
418 | ||
419 | EXPORT_SYMBOL(dump_stack); | |
420 | ||
421 | void show_registers(struct pt_regs *regs) | |
422 | { | |
423 | int i; | |
76381fee | 424 | int in_kernel = !user_mode(regs); |
1da177e4 | 425 | unsigned long rsp; |
151f8cc1 | 426 | const int cpu = smp_processor_id(); |
df79efde | 427 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 LT |
428 | |
429 | rsp = regs->rsp; | |
430 | ||
431 | printk("CPU %d ", cpu); | |
432 | __show_regs(regs); | |
433 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 434 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
435 | |
436 | /* | |
437 | * When in-kernel, we also print out the stack and code at the | |
438 | * time of the fault.. | |
439 | */ | |
440 | if (in_kernel) { | |
441 | ||
442 | printk("Stack: "); | |
b538ed27 | 443 | _show_stack(NULL, regs, (unsigned long*)rsp); |
1da177e4 LT |
444 | |
445 | printk("\nCode: "); | |
2b692a87 | 446 | if (regs->rip < PAGE_OFFSET) |
1da177e4 LT |
447 | goto bad; |
448 | ||
2b692a87 | 449 | for (i=0; i<20; i++) { |
1da177e4 | 450 | unsigned char c; |
2b692a87 | 451 | if (__get_user(c, &((unsigned char*)regs->rip)[i])) { |
1da177e4 LT |
452 | bad: |
453 | printk(" Bad RIP value."); | |
454 | break; | |
455 | } | |
456 | printk("%02x ", c); | |
457 | } | |
458 | } | |
459 | printk("\n"); | |
460 | } | |
461 | ||
c31a0bf3 JF |
462 | int is_valid_bugaddr(unsigned long rip) |
463 | { | |
464 | unsigned short ud2; | |
465 | ||
466 | if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2))) | |
467 | return 0; | |
468 | ||
469 | return ud2 == 0x0b0f; | |
470 | } | |
1da177e4 | 471 | |
4f60fdf6 | 472 | #ifdef CONFIG_BUG |
1da177e4 LT |
473 | void out_of_line_bug(void) |
474 | { | |
475 | BUG(); | |
476 | } | |
2ee60e17 | 477 | EXPORT_SYMBOL(out_of_line_bug); |
4f60fdf6 | 478 | #endif |
1da177e4 LT |
479 | |
480 | static DEFINE_SPINLOCK(die_lock); | |
481 | static int die_owner = -1; | |
cdc60a4c | 482 | static unsigned int die_nest_count; |
1da177e4 | 483 | |
eddb6fb9 | 484 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 485 | { |
151f8cc1 | 486 | int cpu = smp_processor_id(); |
1209140c JB |
487 | unsigned long flags; |
488 | ||
abf0f109 AM |
489 | oops_enter(); |
490 | ||
1209140c JB |
491 | /* racy, but better than risking deadlock. */ |
492 | local_irq_save(flags); | |
1da177e4 LT |
493 | if (!spin_trylock(&die_lock)) { |
494 | if (cpu == die_owner) | |
495 | /* nested oops. should stop eventually */; | |
496 | else | |
1209140c | 497 | spin_lock(&die_lock); |
1da177e4 | 498 | } |
cdc60a4c | 499 | die_nest_count++; |
1209140c | 500 | die_owner = cpu; |
1da177e4 | 501 | console_verbose(); |
1209140c JB |
502 | bust_spinlocks(1); |
503 | return flags; | |
1da177e4 LT |
504 | } |
505 | ||
eddb6fb9 | 506 | void __kprobes oops_end(unsigned long flags) |
1da177e4 LT |
507 | { |
508 | die_owner = -1; | |
1209140c | 509 | bust_spinlocks(0); |
cdc60a4c CM |
510 | die_nest_count--; |
511 | if (die_nest_count) | |
512 | /* We still own the lock */ | |
513 | local_irq_restore(flags); | |
514 | else | |
515 | /* Nest count reaches zero, release the lock. */ | |
516 | spin_unlock_irqrestore(&die_lock, flags); | |
1da177e4 | 517 | if (panic_on_oops) |
012c437d | 518 | panic("Fatal exception"); |
abf0f109 | 519 | oops_exit(); |
1209140c | 520 | } |
1da177e4 | 521 | |
eddb6fb9 | 522 | void __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
523 | { |
524 | static int die_counter; | |
525 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
526 | #ifdef CONFIG_PREEMPT | |
527 | printk("PREEMPT "); | |
528 | #endif | |
529 | #ifdef CONFIG_SMP | |
530 | printk("SMP "); | |
531 | #endif | |
532 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
533 | printk("DEBUG_PAGEALLOC"); | |
534 | #endif | |
535 | printk("\n"); | |
6e3f3617 | 536 | notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); |
1da177e4 LT |
537 | show_registers(regs); |
538 | /* Executive summary in case the oops scrolled away */ | |
539 | printk(KERN_ALERT "RIP "); | |
540 | printk_address(regs->rip); | |
541 | printk(" RSP <%016lx>\n", regs->rsp); | |
8bcc5280 VG |
542 | if (kexec_should_crash(current)) |
543 | crash_kexec(regs); | |
1da177e4 LT |
544 | } |
545 | ||
546 | void die(const char * str, struct pt_regs * regs, long err) | |
547 | { | |
1209140c JB |
548 | unsigned long flags = oops_begin(); |
549 | ||
c31a0bf3 JF |
550 | if (!user_mode(regs)) |
551 | report_bug(regs->rip); | |
552 | ||
1da177e4 | 553 | __die(str, regs, err); |
1209140c | 554 | oops_end(flags); |
1da177e4 LT |
555 | do_exit(SIGSEGV); |
556 | } | |
1da177e4 | 557 | |
fac58550 | 558 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 559 | { |
1209140c JB |
560 | unsigned long flags = oops_begin(); |
561 | ||
1da177e4 LT |
562 | /* |
563 | * We are in trouble anyway, lets at least try | |
564 | * to get a message out. | |
565 | */ | |
151f8cc1 | 566 | printk(str, smp_processor_id()); |
1da177e4 | 567 | show_registers(regs); |
8bcc5280 VG |
568 | if (kexec_should_crash(current)) |
569 | crash_kexec(regs); | |
fac58550 AK |
570 | if (do_panic || panic_on_oops) |
571 | panic("Non maskable interrupt"); | |
1209140c | 572 | oops_end(flags); |
8b1ffe95 CM |
573 | nmi_exit(); |
574 | local_irq_enable(); | |
1da177e4 LT |
575 | do_exit(SIGSEGV); |
576 | } | |
577 | ||
0f2fbdcb PP |
578 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
579 | struct pt_regs * regs, long error_code, | |
580 | siginfo_t *info) | |
1da177e4 | 581 | { |
6e3f3617 JB |
582 | struct task_struct *tsk = current; |
583 | ||
6e3f3617 JB |
584 | tsk->thread.error_code = error_code; |
585 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 586 | |
6e3f3617 | 587 | if (user_mode(regs)) { |
1da177e4 LT |
588 | if (exception_trace && unhandled_signal(tsk, signr)) |
589 | printk(KERN_INFO | |
590 | "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n", | |
591 | tsk->comm, tsk->pid, str, | |
2b692a87 | 592 | regs->rip, regs->rsp, error_code); |
1da177e4 | 593 | |
1da177e4 LT |
594 | if (info) |
595 | force_sig_info(signr, info, tsk); | |
596 | else | |
597 | force_sig(signr, tsk); | |
598 | return; | |
599 | } | |
600 | ||
601 | ||
602 | /* kernel trap */ | |
603 | { | |
604 | const struct exception_table_entry *fixup; | |
605 | fixup = search_exception_tables(regs->rip); | |
2b692a87 | 606 | if (fixup) |
1da177e4 | 607 | regs->rip = fixup->fixup; |
2b692a87 | 608 | else |
1da177e4 LT |
609 | die(str, regs, error_code); |
610 | return; | |
611 | } | |
612 | } | |
613 | ||
614 | #define DO_ERROR(trapnr, signr, str, name) \ | |
615 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
616 | { \ | |
617 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
618 | == NOTIFY_STOP) \ | |
619 | return; \ | |
40e59a61 | 620 | conditional_sti(regs); \ |
1da177e4 LT |
621 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
622 | } | |
623 | ||
624 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
625 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
626 | { \ | |
627 | siginfo_t info; \ | |
628 | info.si_signo = signr; \ | |
629 | info.si_errno = 0; \ | |
630 | info.si_code = sicode; \ | |
631 | info.si_addr = (void __user *)siaddr; \ | |
632 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
633 | == NOTIFY_STOP) \ | |
634 | return; \ | |
40e59a61 | 635 | conditional_sti(regs); \ |
1da177e4 LT |
636 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
637 | } | |
638 | ||
639 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip) | |
640 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) | |
641 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
100c0e36 | 642 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip) |
1da177e4 LT |
643 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
644 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
645 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
646 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
647 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
648 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
649 | |
650 | /* Runs on IST stack */ | |
651 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
652 | { | |
653 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
654 | 12, SIGBUS) == NOTIFY_STOP) | |
655 | return; | |
656 | preempt_conditional_sti(regs); | |
657 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
658 | preempt_conditional_cli(regs); | |
659 | } | |
eca37c18 JB |
660 | |
661 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
662 | { | |
663 | static const char str[] = "double fault"; | |
664 | struct task_struct *tsk = current; | |
665 | ||
666 | /* Return not checked because double check cannot be ignored */ | |
667 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
668 | ||
669 | tsk->thread.error_code = error_code; | |
670 | tsk->thread.trap_no = 8; | |
671 | ||
672 | /* This is always a kernel trap and never fixable (and thus must | |
673 | never return). */ | |
674 | for (;;) | |
675 | die(str, regs, error_code); | |
676 | } | |
1da177e4 | 677 | |
0f2fbdcb PP |
678 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
679 | long error_code) | |
1da177e4 | 680 | { |
6e3f3617 JB |
681 | struct task_struct *tsk = current; |
682 | ||
1da177e4 LT |
683 | conditional_sti(regs); |
684 | ||
6e3f3617 JB |
685 | tsk->thread.error_code = error_code; |
686 | tsk->thread.trap_no = 13; | |
1da177e4 | 687 | |
6e3f3617 | 688 | if (user_mode(regs)) { |
1da177e4 LT |
689 | if (exception_trace && unhandled_signal(tsk, SIGSEGV)) |
690 | printk(KERN_INFO | |
691 | "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n", | |
692 | tsk->comm, tsk->pid, | |
2b692a87 | 693 | regs->rip, regs->rsp, error_code); |
1da177e4 | 694 | |
1da177e4 LT |
695 | force_sig(SIGSEGV, tsk); |
696 | return; | |
697 | } | |
698 | ||
699 | /* kernel gp */ | |
700 | { | |
701 | const struct exception_table_entry *fixup; | |
702 | fixup = search_exception_tables(regs->rip); | |
703 | if (fixup) { | |
704 | regs->rip = fixup->fixup; | |
705 | return; | |
706 | } | |
707 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
708 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
709 | return; | |
710 | die("general protection fault", regs, error_code); | |
711 | } | |
712 | } | |
713 | ||
eddb6fb9 AK |
714 | static __kprobes void |
715 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 716 | { |
c41c5cd3 DZ |
717 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
718 | reason); | |
9c5f8be4 | 719 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 720 | |
8da5adda | 721 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
722 | panic("NMI: Not continuing"); |
723 | ||
724 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
725 | |
726 | /* Clear and disable the memory parity error line. */ | |
727 | reason = (reason & 0xf) | 4; | |
728 | outb(reason, 0x61); | |
729 | } | |
730 | ||
eddb6fb9 AK |
731 | static __kprobes void |
732 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
733 | { |
734 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
735 | show_registers(regs); | |
736 | ||
737 | /* Re-enable the IOCK line, wait for a few seconds */ | |
738 | reason = (reason & 0xf) | 8; | |
739 | outb(reason, 0x61); | |
740 | mdelay(2000); | |
741 | reason &= ~8; | |
742 | outb(reason, 0x61); | |
743 | } | |
744 | ||
eddb6fb9 AK |
745 | static __kprobes void |
746 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 DZ |
747 | { |
748 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", | |
749 | reason); | |
750 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
751 | |
752 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 753 | panic("NMI: Not continuing"); |
8da5adda | 754 | |
c41c5cd3 | 755 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
756 | } |
757 | ||
6fefb0d1 AK |
758 | /* Runs on IST stack. This code must keep interrupts off all the time. |
759 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 760 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
761 | { |
762 | unsigned char reason = 0; | |
76e4f660 AR |
763 | int cpu; |
764 | ||
765 | cpu = smp_processor_id(); | |
1da177e4 LT |
766 | |
767 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 768 | if (!cpu) |
1da177e4 LT |
769 | reason = get_nmi_reason(); |
770 | ||
771 | if (!(reason & 0xc0)) { | |
6e3f3617 | 772 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
773 | == NOTIFY_STOP) |
774 | return; | |
1da177e4 LT |
775 | /* |
776 | * Ok, so this is none of the documented NMI sources, | |
777 | * so it must be the NMI watchdog. | |
778 | */ | |
3adbbcce | 779 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 780 | return; |
3adbbcce | 781 | if (!do_nmi_callback(regs,cpu)) |
3adbbcce DZ |
782 | unknown_nmi_error(reason, regs); |
783 | ||
1da177e4 LT |
784 | return; |
785 | } | |
6e3f3617 | 786 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
787 | return; |
788 | ||
789 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
790 | ||
791 | if (reason & 0x80) | |
792 | mem_parity_error(reason, regs); | |
793 | if (reason & 0x40) | |
794 | io_check_error(reason, regs); | |
795 | } | |
796 | ||
b556b35e | 797 | /* runs on IST stack. */ |
0f2fbdcb | 798 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 LT |
799 | { |
800 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { | |
801 | return; | |
802 | } | |
40e59a61 | 803 | preempt_conditional_sti(regs); |
1da177e4 | 804 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 805 | preempt_conditional_cli(regs); |
1da177e4 LT |
806 | } |
807 | ||
6fefb0d1 AK |
808 | /* Help handler running on IST stack to switch back to user stack |
809 | for scheduling or signal handling. The actual stack switch is done in | |
810 | entry.S */ | |
eddb6fb9 | 811 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
812 | { |
813 | struct pt_regs *regs = eregs; | |
814 | /* Did already sync */ | |
815 | if (eregs == (struct pt_regs *)eregs->rsp) | |
816 | ; | |
817 | /* Exception from user space */ | |
76381fee | 818 | else if (user_mode(eregs)) |
bb049232 | 819 | regs = task_pt_regs(current); |
6fefb0d1 AK |
820 | /* Exception from kernel and interrupts are enabled. Move to |
821 | kernel process stack. */ | |
822 | else if (eregs->eflags & X86_EFLAGS_IF) | |
823 | regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs)); | |
824 | if (eregs != regs) | |
825 | *regs = *eregs; | |
826 | return regs; | |
827 | } | |
828 | ||
1da177e4 | 829 | /* runs on IST stack. */ |
0f2fbdcb PP |
830 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
831 | unsigned long error_code) | |
1da177e4 | 832 | { |
1da177e4 LT |
833 | unsigned long condition; |
834 | struct task_struct *tsk = current; | |
835 | siginfo_t info; | |
836 | ||
e9129e56 | 837 | get_debugreg(condition, 6); |
1da177e4 LT |
838 | |
839 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, | |
daeeafec | 840 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 841 | return; |
daeeafec | 842 | |
a65d17c9 | 843 | preempt_conditional_sti(regs); |
1da177e4 LT |
844 | |
845 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
846 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
847 | if (!tsk->thread.debugreg7) { | |
848 | goto clear_dr7; | |
849 | } | |
850 | } | |
851 | ||
852 | tsk->thread.debugreg6 = condition; | |
853 | ||
854 | /* Mask out spurious TF errors due to lazy TF clearing */ | |
daeeafec | 855 | if (condition & DR_STEP) { |
1da177e4 LT |
856 | /* |
857 | * The TF error should be masked out only if the current | |
858 | * process is not traced and if the TRAP flag has been set | |
859 | * previously by a tracing process (condition detected by | |
860 | * the PT_DTRACE flag); remember that the i386 TRAP flag | |
861 | * can be modified by the process itself in user mode, | |
862 | * allowing programs to debug themselves without the ptrace() | |
863 | * interface. | |
864 | */ | |
76381fee | 865 | if (!user_mode(regs)) |
1da177e4 | 866 | goto clear_TF_reenable; |
be61bff7 AK |
867 | /* |
868 | * Was the TF flag set by a debugger? If so, clear it now, | |
869 | * so that register information is correct. | |
870 | */ | |
871 | if (tsk->ptrace & PT_DTRACE) { | |
872 | regs->eflags &= ~TF_MASK; | |
873 | tsk->ptrace &= ~PT_DTRACE; | |
874 | } | |
1da177e4 LT |
875 | } |
876 | ||
877 | /* Ok, finally something we can handle */ | |
878 | tsk->thread.trap_no = 1; | |
879 | tsk->thread.error_code = error_code; | |
880 | info.si_signo = SIGTRAP; | |
881 | info.si_errno = 0; | |
882 | info.si_code = TRAP_BRKPT; | |
01b8faae JB |
883 | info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL; |
884 | force_sig_info(SIGTRAP, &info, tsk); | |
1da177e4 | 885 | |
1da177e4 | 886 | clear_dr7: |
e9129e56 | 887 | set_debugreg(0UL, 7); |
a65d17c9 | 888 | preempt_conditional_cli(regs); |
6fefb0d1 | 889 | return; |
1da177e4 LT |
890 | |
891 | clear_TF_reenable: | |
892 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
1da177e4 | 893 | regs->eflags &= ~TF_MASK; |
a65d17c9 | 894 | preempt_conditional_cli(regs); |
1da177e4 LT |
895 | } |
896 | ||
6e3f3617 | 897 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 LT |
898 | { |
899 | const struct exception_table_entry *fixup; | |
900 | fixup = search_exception_tables(regs->rip); | |
901 | if (fixup) { | |
902 | regs->rip = fixup->fixup; | |
903 | return 1; | |
904 | } | |
6e3f3617 | 905 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 906 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 907 | current->thread.trap_no = trapnr; |
1da177e4 | 908 | die(str, regs, 0); |
1da177e4 LT |
909 | return 0; |
910 | } | |
911 | ||
912 | /* | |
913 | * Note that we play around with the 'TS' bit in an attempt to get | |
914 | * the correct behaviour even in the presence of the asynchronous | |
915 | * IRQ13 behaviour | |
916 | */ | |
917 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
918 | { | |
919 | void __user *rip = (void __user *)(regs->rip); | |
920 | struct task_struct * task; | |
921 | siginfo_t info; | |
922 | unsigned short cwd, swd; | |
923 | ||
924 | conditional_sti(regs); | |
76381fee | 925 | if (!user_mode(regs) && |
6e3f3617 | 926 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
927 | return; |
928 | ||
929 | /* | |
930 | * Save the info for the exception handler and clear the error. | |
931 | */ | |
932 | task = current; | |
933 | save_init_fpu(task); | |
934 | task->thread.trap_no = 16; | |
935 | task->thread.error_code = 0; | |
936 | info.si_signo = SIGFPE; | |
937 | info.si_errno = 0; | |
938 | info.si_code = __SI_FAULT; | |
939 | info.si_addr = rip; | |
940 | /* | |
941 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
942 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
943 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
944 | * fault bit. We should only be taking one exception at a time, | |
945 | * so if this combination doesn't produce any single exception, | |
946 | * then we have a bad program that isn't synchronizing its FPU usage | |
947 | * and it will suffer the consequences since we won't be able to | |
948 | * fully reproduce the context of the exception | |
949 | */ | |
950 | cwd = get_fpu_cwd(task); | |
951 | swd = get_fpu_swd(task); | |
ff347b22 | 952 | switch (swd & ~cwd & 0x3f) { |
1da177e4 LT |
953 | case 0x000: |
954 | default: | |
955 | break; | |
956 | case 0x001: /* Invalid Op */ | |
ff347b22 CE |
957 | /* |
958 | * swd & 0x240 == 0x040: Stack Underflow | |
959 | * swd & 0x240 == 0x240: Stack Overflow | |
960 | * User must clear the SF bit (0x40) if set | |
961 | */ | |
1da177e4 LT |
962 | info.si_code = FPE_FLTINV; |
963 | break; | |
964 | case 0x002: /* Denormalize */ | |
965 | case 0x010: /* Underflow */ | |
966 | info.si_code = FPE_FLTUND; | |
967 | break; | |
968 | case 0x004: /* Zero Divide */ | |
969 | info.si_code = FPE_FLTDIV; | |
970 | break; | |
971 | case 0x008: /* Overflow */ | |
972 | info.si_code = FPE_FLTOVF; | |
973 | break; | |
974 | case 0x020: /* Precision */ | |
975 | info.si_code = FPE_FLTRES; | |
976 | break; | |
977 | } | |
978 | force_sig_info(SIGFPE, &info, task); | |
979 | } | |
980 | ||
981 | asmlinkage void bad_intr(void) | |
982 | { | |
983 | printk("bad interrupt"); | |
984 | } | |
985 | ||
986 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
987 | { | |
988 | void __user *rip = (void __user *)(regs->rip); | |
989 | struct task_struct * task; | |
990 | siginfo_t info; | |
991 | unsigned short mxcsr; | |
992 | ||
993 | conditional_sti(regs); | |
76381fee | 994 | if (!user_mode(regs) && |
6e3f3617 | 995 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
996 | return; |
997 | ||
998 | /* | |
999 | * Save the info for the exception handler and clear the error. | |
1000 | */ | |
1001 | task = current; | |
1002 | save_init_fpu(task); | |
1003 | task->thread.trap_no = 19; | |
1004 | task->thread.error_code = 0; | |
1005 | info.si_signo = SIGFPE; | |
1006 | info.si_errno = 0; | |
1007 | info.si_code = __SI_FAULT; | |
1008 | info.si_addr = rip; | |
1009 | /* | |
1010 | * The SIMD FPU exceptions are handled a little differently, as there | |
1011 | * is only a single status/control register. Thus, to determine which | |
1012 | * unmasked exception was caught we must mask the exception mask bits | |
1013 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1014 | */ | |
1015 | mxcsr = get_fpu_mxcsr(task); | |
1016 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
1017 | case 0x000: | |
1018 | default: | |
1019 | break; | |
1020 | case 0x001: /* Invalid Op */ | |
1021 | info.si_code = FPE_FLTINV; | |
1022 | break; | |
1023 | case 0x002: /* Denormalize */ | |
1024 | case 0x010: /* Underflow */ | |
1025 | info.si_code = FPE_FLTUND; | |
1026 | break; | |
1027 | case 0x004: /* Zero Divide */ | |
1028 | info.si_code = FPE_FLTDIV; | |
1029 | break; | |
1030 | case 0x008: /* Overflow */ | |
1031 | info.si_code = FPE_FLTOVF; | |
1032 | break; | |
1033 | case 0x020: /* Precision */ | |
1034 | info.si_code = FPE_FLTRES; | |
1035 | break; | |
1036 | } | |
1037 | force_sig_info(SIGFPE, &info, task); | |
1038 | } | |
1039 | ||
1040 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1041 | { | |
1042 | } | |
1043 | ||
1044 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1045 | { |
1046 | } | |
1047 | ||
1048 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1049 | { |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * 'math_state_restore()' saves the current math information in the | |
1054 | * old math state array, and gets the new ones from the current task | |
1055 | * | |
1056 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1057 | * Don't touch unless you *really* know how it works. | |
1058 | */ | |
1059 | asmlinkage void math_state_restore(void) | |
1060 | { | |
1061 | struct task_struct *me = current; | |
1062 | clts(); /* Allow maths ops (or we recurse) */ | |
1063 | ||
1064 | if (!used_math()) | |
1065 | init_fpu(me); | |
1066 | restore_fpu_checking(&me->thread.i387.fxsave); | |
e4f17c43 | 1067 | task_thread_info(me)->status |= TS_USEDFPU; |
e07e23e1 | 1068 | me->fpu_counter++; |
1da177e4 LT |
1069 | } |
1070 | ||
1da177e4 LT |
1071 | void __init trap_init(void) |
1072 | { | |
1073 | set_intr_gate(0,÷_error); | |
1074 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1075 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1076 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1077 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1078 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1079 | set_intr_gate(6,&invalid_op); |
1080 | set_intr_gate(7,&device_not_available); | |
1081 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1082 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1083 | set_intr_gate(10,&invalid_TSS); | |
1084 | set_intr_gate(11,&segment_not_present); | |
1085 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1086 | set_intr_gate(13,&general_protection); | |
1087 | set_intr_gate(14,&page_fault); | |
1088 | set_intr_gate(15,&spurious_interrupt_bug); | |
1089 | set_intr_gate(16,&coprocessor_error); | |
1090 | set_intr_gate(17,&alignment_check); | |
1091 | #ifdef CONFIG_X86_MCE | |
1092 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1093 | #endif | |
1094 | set_intr_gate(19,&simd_coprocessor_error); | |
1095 | ||
1096 | #ifdef CONFIG_IA32_EMULATION | |
1097 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1098 | #endif | |
1099 | ||
1da177e4 LT |
1100 | /* |
1101 | * Should be a barrier for any external CPU state. | |
1102 | */ | |
1103 | cpu_init(); | |
1104 | } | |
1105 | ||
1106 | ||
2c8c0e6b | 1107 | static int __init oops_setup(char *s) |
1da177e4 | 1108 | { |
2c8c0e6b AK |
1109 | if (!s) |
1110 | return -EINVAL; | |
1111 | if (!strcmp(s, "panic")) | |
1112 | panic_on_oops = 1; | |
1113 | return 0; | |
1da177e4 | 1114 | } |
2c8c0e6b | 1115 | early_param("oops", oops_setup); |
1da177e4 LT |
1116 | |
1117 | static int __init kstack_setup(char *s) | |
1118 | { | |
2c8c0e6b AK |
1119 | if (!s) |
1120 | return -EINVAL; | |
1da177e4 | 1121 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
2c8c0e6b | 1122 | return 0; |
1da177e4 | 1123 | } |
2c8c0e6b | 1124 | early_param("kstack", kstack_setup); |