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> |
1eeb66a1 | 35 | #include <linux/kdebug.h> |
1da177e4 | 36 | |
c0d12172 DJ |
37 | #if defined(CONFIG_EDAC) |
38 | #include <linux/edac.h> | |
39 | #endif | |
40 | ||
1da177e4 | 41 | #include <asm/system.h> |
1da177e4 LT |
42 | #include <asm/io.h> |
43 | #include <asm/atomic.h> | |
44 | #include <asm/debugreg.h> | |
45 | #include <asm/desc.h> | |
46 | #include <asm/i387.h> | |
1da177e4 | 47 | #include <asm/processor.h> |
b538ed27 | 48 | #include <asm/unwind.h> |
1da177e4 LT |
49 | #include <asm/smp.h> |
50 | #include <asm/pgalloc.h> | |
51 | #include <asm/pda.h> | |
52 | #include <asm/proto.h> | |
53 | #include <asm/nmi.h> | |
c0b766f1 | 54 | #include <asm/stacktrace.h> |
1da177e4 | 55 | |
1da177e4 LT |
56 | asmlinkage void divide_error(void); |
57 | asmlinkage void debug(void); | |
58 | asmlinkage void nmi(void); | |
59 | asmlinkage void int3(void); | |
60 | asmlinkage void overflow(void); | |
61 | asmlinkage void bounds(void); | |
62 | asmlinkage void invalid_op(void); | |
63 | asmlinkage void device_not_available(void); | |
64 | asmlinkage void double_fault(void); | |
65 | asmlinkage void coprocessor_segment_overrun(void); | |
66 | asmlinkage void invalid_TSS(void); | |
67 | asmlinkage void segment_not_present(void); | |
68 | asmlinkage void stack_segment(void); | |
69 | asmlinkage void general_protection(void); | |
70 | asmlinkage void page_fault(void); | |
71 | asmlinkage void coprocessor_error(void); | |
72 | asmlinkage void simd_coprocessor_error(void); | |
73 | asmlinkage void reserved(void); | |
74 | asmlinkage void alignment_check(void); | |
75 | asmlinkage void machine_check(void); | |
76 | asmlinkage void spurious_interrupt_bug(void); | |
1da177e4 | 77 | |
1da177e4 LT |
78 | static inline void conditional_sti(struct pt_regs *regs) |
79 | { | |
80 | if (regs->eflags & X86_EFLAGS_IF) | |
81 | local_irq_enable(); | |
82 | } | |
83 | ||
a65d17c9 JB |
84 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
85 | { | |
86 | preempt_disable(); | |
87 | if (regs->eflags & X86_EFLAGS_IF) | |
88 | local_irq_enable(); | |
89 | } | |
90 | ||
91 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
92 | { | |
93 | if (regs->eflags & X86_EFLAGS_IF) | |
94 | local_irq_disable(); | |
40e59a61 AK |
95 | /* Make sure to not schedule here because we could be running |
96 | on an exception stack. */ | |
a65d17c9 JB |
97 | preempt_enable_no_resched(); |
98 | } | |
99 | ||
0741f4d2 | 100 | int kstack_depth_to_print = 12; |
1da177e4 LT |
101 | |
102 | #ifdef CONFIG_KALLSYMS | |
3ac94932 IM |
103 | void printk_address(unsigned long address) |
104 | { | |
1da177e4 LT |
105 | unsigned long offset = 0, symsize; |
106 | const char *symname; | |
107 | char *modname; | |
3ac94932 | 108 | char *delim = ":"; |
1da177e4 LT |
109 | char namebuf[128]; |
110 | ||
3ac94932 IM |
111 | symname = kallsyms_lookup(address, &symsize, &offset, |
112 | &modname, namebuf); | |
113 | if (!symname) { | |
114 | printk(" [<%016lx>]\n", address); | |
115 | return; | |
116 | } | |
117 | if (!modname) | |
1da177e4 | 118 | modname = delim = ""; |
3ac94932 IM |
119 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
120 | address, delim, modname, delim, symname, offset, symsize); | |
121 | } | |
1da177e4 | 122 | #else |
3ac94932 IM |
123 | void printk_address(unsigned long address) |
124 | { | |
125 | printk(" [<%016lx>]\n", address); | |
126 | } | |
1da177e4 LT |
127 | #endif |
128 | ||
0a658002 | 129 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 130 | unsigned *usedp, char **idp) |
0a658002 | 131 | { |
b556b35e | 132 | static char ids[][8] = { |
0a658002 AK |
133 | [DEBUG_STACK - 1] = "#DB", |
134 | [NMI_STACK - 1] = "NMI", | |
135 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
136 | [STACKFAULT_STACK - 1] = "#SS", | |
137 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
138 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
139 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
140 | #endif | |
0a658002 AK |
141 | }; |
142 | unsigned k; | |
1da177e4 | 143 | |
c9ca1ba5 IM |
144 | /* |
145 | * Iterate over all exception stacks, and figure out whether | |
146 | * 'stack' is in one of them: | |
147 | */ | |
0a658002 | 148 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 149 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
150 | /* |
151 | * Is 'stack' above this exception frame's end? | |
152 | * If yes then skip to the next frame. | |
153 | */ | |
0a658002 AK |
154 | if (stack >= end) |
155 | continue; | |
c9ca1ba5 IM |
156 | /* |
157 | * Is 'stack' above this exception frame's start address? | |
158 | * If yes then we found the right frame. | |
159 | */ | |
0a658002 | 160 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
161 | /* |
162 | * Make sure we only iterate through an exception | |
163 | * stack once. If it comes up for the second time | |
164 | * then there's something wrong going on - just | |
165 | * break out and return NULL: | |
166 | */ | |
0a658002 AK |
167 | if (*usedp & (1U << k)) |
168 | break; | |
169 | *usedp |= 1U << k; | |
170 | *idp = ids[k]; | |
171 | return (unsigned long *)end; | |
172 | } | |
c9ca1ba5 IM |
173 | /* |
174 | * If this is a debug stack, and if it has a larger size than | |
175 | * the usual exception stacks, then 'stack' might still | |
176 | * be within the lower portion of the debug stack: | |
177 | */ | |
b556b35e JB |
178 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
179 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
180 | unsigned j = N_EXCEPTION_STACKS - 1; | |
181 | ||
c9ca1ba5 IM |
182 | /* |
183 | * Black magic. A large debug stack is composed of | |
184 | * multiple exception stack entries, which we | |
185 | * iterate through now. Dont look: | |
186 | */ | |
b556b35e JB |
187 | do { |
188 | ++j; | |
189 | end -= EXCEPTION_STKSZ; | |
190 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
191 | } while (stack < end - EXCEPTION_STKSZ); | |
192 | if (*usedp & (1U << j)) | |
193 | break; | |
194 | *usedp |= 1U << j; | |
195 | *idp = ids[j]; | |
196 | return (unsigned long *)end; | |
197 | } | |
198 | #endif | |
1da177e4 LT |
199 | } |
200 | return NULL; | |
0a658002 | 201 | } |
1da177e4 | 202 | |
b615ebda AK |
203 | #define MSG(txt) ops->warning(data, txt) |
204 | ||
1da177e4 LT |
205 | /* |
206 | * x86-64 can have upto three kernel stacks: | |
207 | * process stack | |
208 | * interrupt stack | |
0a658002 | 209 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
210 | */ |
211 | ||
c547c77e AK |
212 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
213 | { | |
214 | void *t = (void *)tinfo; | |
215 | return p > t && p < t + THREAD_SIZE - 3; | |
216 | } | |
217 | ||
b615ebda AK |
218 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
219 | unsigned long *stack, | |
c0b766f1 | 220 | struct stacktrace_ops *ops, void *data) |
1da177e4 | 221 | { |
da68933e | 222 | const unsigned cpu = get_cpu(); |
b615ebda | 223 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 224 | unsigned used = 0; |
c547c77e | 225 | struct thread_info *tinfo; |
1da177e4 | 226 | |
b538ed27 JB |
227 | if (!tsk) |
228 | tsk = current; | |
229 | ||
c0b766f1 AK |
230 | if (!stack) { |
231 | unsigned long dummy; | |
232 | stack = &dummy; | |
233 | if (tsk && tsk != current) | |
234 | stack = (unsigned long *)tsk->thread.rsp; | |
b538ed27 JB |
235 | } |
236 | ||
c9ca1ba5 IM |
237 | /* |
238 | * Print function call entries within a stack. 'cond' is the | |
239 | * "end of stackframe" condition, that the 'stack++' | |
240 | * iteration will eventually trigger. | |
241 | */ | |
0a658002 AK |
242 | #define HANDLE_STACK(cond) \ |
243 | do while (cond) { \ | |
1b2f6304 | 244 | unsigned long addr = *stack++; \ |
446f713b AK |
245 | /* Use unlocked access here because except for NMIs \ |
246 | we should be already protected against module unloads */ \ | |
247 | if (__kernel_text_address(addr)) { \ | |
0a658002 AK |
248 | /* \ |
249 | * If the address is either in the text segment of the \ | |
250 | * kernel, or in the region which contains vmalloc'ed \ | |
251 | * memory, it *may* be the address of a calling \ | |
252 | * routine; if so, print it so that someone tracing \ | |
253 | * down the cause of the crash will be able to figure \ | |
254 | * out the call path that was taken. \ | |
255 | */ \ | |
c0b766f1 | 256 | ops->address(data, addr); \ |
0a658002 AK |
257 | } \ |
258 | } while (0) | |
259 | ||
c9ca1ba5 IM |
260 | /* |
261 | * Print function call entries in all stacks, starting at the | |
262 | * current stack address. If the stacks consist of nested | |
263 | * exceptions | |
264 | */ | |
c0b766f1 AK |
265 | for (;;) { |
266 | char *id; | |
0a658002 AK |
267 | unsigned long *estack_end; |
268 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
269 | &used, &id); | |
270 | ||
271 | if (estack_end) { | |
c0b766f1 AK |
272 | if (ops->stack(data, id) < 0) |
273 | break; | |
0a658002 | 274 | HANDLE_STACK (stack < estack_end); |
c0b766f1 | 275 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
276 | /* |
277 | * We link to the next stack via the | |
278 | * second-to-last pointer (index -2 to end) in the | |
279 | * exception stack: | |
280 | */ | |
0a658002 AK |
281 | stack = (unsigned long *) estack_end[-2]; |
282 | continue; | |
1da177e4 | 283 | } |
0a658002 AK |
284 | if (irqstack_end) { |
285 | unsigned long *irqstack; | |
286 | irqstack = irqstack_end - | |
287 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
288 | ||
289 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
290 | if (ops->stack(data, "IRQ") < 0) |
291 | break; | |
0a658002 | 292 | HANDLE_STACK (stack < irqstack_end); |
c9ca1ba5 IM |
293 | /* |
294 | * We link to the next stack (which would be | |
295 | * the process stack normally) the last | |
296 | * pointer (index -1 to end) in the IRQ stack: | |
297 | */ | |
0a658002 AK |
298 | stack = (unsigned long *) (irqstack_end[-1]); |
299 | irqstack_end = NULL; | |
c0b766f1 | 300 | ops->stack(data, "EOI"); |
0a658002 | 301 | continue; |
1da177e4 | 302 | } |
1da177e4 | 303 | } |
0a658002 | 304 | break; |
1da177e4 | 305 | } |
0a658002 | 306 | |
c9ca1ba5 | 307 | /* |
c0b766f1 | 308 | * This handles the process stack: |
c9ca1ba5 | 309 | */ |
7523c4dd | 310 | tinfo = task_thread_info(tsk); |
c547c77e | 311 | HANDLE_STACK (valid_stack_ptr(tinfo, stack)); |
0a658002 | 312 | #undef HANDLE_STACK |
da68933e | 313 | put_cpu(); |
c0b766f1 AK |
314 | } |
315 | EXPORT_SYMBOL(dump_trace); | |
316 | ||
317 | static void | |
318 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
319 | { | |
320 | print_symbol(msg, symbol); | |
321 | printk("\n"); | |
322 | } | |
323 | ||
324 | static void print_trace_warning(void *data, char *msg) | |
325 | { | |
326 | printk("%s\n", msg); | |
327 | } | |
328 | ||
329 | static int print_trace_stack(void *data, char *name) | |
330 | { | |
331 | printk(" <%s> ", name); | |
332 | return 0; | |
333 | } | |
3ac94932 | 334 | |
c0b766f1 AK |
335 | static void print_trace_address(void *data, unsigned long addr) |
336 | { | |
1c978b93 | 337 | touch_nmi_watchdog(); |
c0b766f1 AK |
338 | printk_address(addr); |
339 | } | |
340 | ||
341 | static struct stacktrace_ops print_trace_ops = { | |
342 | .warning = print_trace_warning, | |
343 | .warning_symbol = print_trace_warning_symbol, | |
344 | .stack = print_trace_stack, | |
345 | .address = print_trace_address, | |
346 | }; | |
347 | ||
348 | void | |
349 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) | |
350 | { | |
351 | printk("\nCall Trace:\n"); | |
352 | dump_trace(tsk, regs, stack, &print_trace_ops, NULL); | |
1da177e4 LT |
353 | printk("\n"); |
354 | } | |
355 | ||
c0b766f1 AK |
356 | static void |
357 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp) | |
1da177e4 LT |
358 | { |
359 | unsigned long *stack; | |
360 | int i; | |
151f8cc1 | 361 | const int cpu = smp_processor_id(); |
df79efde RT |
362 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
363 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
364 | |
365 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
366 | // back trace for this cpu. | |
367 | ||
368 | if (rsp == NULL) { | |
369 | if (tsk) | |
370 | rsp = (unsigned long *)tsk->thread.rsp; | |
371 | else | |
372 | rsp = (unsigned long *)&rsp; | |
373 | } | |
374 | ||
375 | stack = rsp; | |
376 | for(i=0; i < kstack_depth_to_print; i++) { | |
377 | if (stack >= irqstack && stack <= irqstack_end) { | |
378 | if (stack == irqstack_end) { | |
379 | stack = (unsigned long *) (irqstack_end[-1]); | |
380 | printk(" <EOI> "); | |
381 | } | |
382 | } else { | |
383 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
384 | break; | |
385 | } | |
386 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
387 | printk("\n"); |
388 | printk(" %016lx", *stack++); | |
35faa714 | 389 | touch_nmi_watchdog(); |
1da177e4 | 390 | } |
b538ed27 JB |
391 | show_trace(tsk, regs, rsp); |
392 | } | |
393 | ||
394 | void show_stack(struct task_struct *tsk, unsigned long * rsp) | |
395 | { | |
396 | _show_stack(tsk, NULL, rsp); | |
1da177e4 LT |
397 | } |
398 | ||
399 | /* | |
400 | * The architecture-independent dump_stack generator | |
401 | */ | |
402 | void dump_stack(void) | |
403 | { | |
404 | unsigned long dummy; | |
b538ed27 | 405 | show_trace(NULL, NULL, &dummy); |
1da177e4 LT |
406 | } |
407 | ||
408 | EXPORT_SYMBOL(dump_stack); | |
409 | ||
410 | void show_registers(struct pt_regs *regs) | |
411 | { | |
412 | int i; | |
76381fee | 413 | int in_kernel = !user_mode(regs); |
1da177e4 | 414 | unsigned long rsp; |
151f8cc1 | 415 | const int cpu = smp_processor_id(); |
df79efde | 416 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 | 417 | |
d039c688 | 418 | rsp = regs->rsp; |
1da177e4 LT |
419 | printk("CPU %d ", cpu); |
420 | __show_regs(regs); | |
421 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 422 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
423 | |
424 | /* | |
425 | * When in-kernel, we also print out the stack and code at the | |
426 | * time of the fault.. | |
427 | */ | |
428 | if (in_kernel) { | |
1da177e4 | 429 | printk("Stack: "); |
b538ed27 | 430 | _show_stack(NULL, regs, (unsigned long*)rsp); |
1da177e4 LT |
431 | |
432 | printk("\nCode: "); | |
2b692a87 | 433 | if (regs->rip < PAGE_OFFSET) |
1da177e4 LT |
434 | goto bad; |
435 | ||
2b692a87 | 436 | for (i=0; i<20; i++) { |
1da177e4 | 437 | unsigned char c; |
2b692a87 | 438 | if (__get_user(c, &((unsigned char*)regs->rip)[i])) { |
1da177e4 LT |
439 | bad: |
440 | printk(" Bad RIP value."); | |
441 | break; | |
442 | } | |
443 | printk("%02x ", c); | |
444 | } | |
445 | } | |
446 | printk("\n"); | |
447 | } | |
448 | ||
c31a0bf3 JF |
449 | int is_valid_bugaddr(unsigned long rip) |
450 | { | |
451 | unsigned short ud2; | |
452 | ||
453 | if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2))) | |
454 | return 0; | |
455 | ||
456 | return ud2 == 0x0b0f; | |
457 | } | |
1da177e4 | 458 | |
4f60fdf6 | 459 | #ifdef CONFIG_BUG |
1da177e4 LT |
460 | void out_of_line_bug(void) |
461 | { | |
462 | BUG(); | |
463 | } | |
2ee60e17 | 464 | EXPORT_SYMBOL(out_of_line_bug); |
4f60fdf6 | 465 | #endif |
1da177e4 LT |
466 | |
467 | static DEFINE_SPINLOCK(die_lock); | |
468 | static int die_owner = -1; | |
cdc60a4c | 469 | static unsigned int die_nest_count; |
1da177e4 | 470 | |
eddb6fb9 | 471 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 472 | { |
b39b7036 | 473 | int cpu; |
1209140c JB |
474 | unsigned long flags; |
475 | ||
abf0f109 AM |
476 | oops_enter(); |
477 | ||
1209140c JB |
478 | /* racy, but better than risking deadlock. */ |
479 | local_irq_save(flags); | |
b39b7036 | 480 | cpu = smp_processor_id(); |
1da177e4 LT |
481 | if (!spin_trylock(&die_lock)) { |
482 | if (cpu == die_owner) | |
483 | /* nested oops. should stop eventually */; | |
484 | else | |
1209140c | 485 | spin_lock(&die_lock); |
1da177e4 | 486 | } |
cdc60a4c | 487 | die_nest_count++; |
1209140c | 488 | die_owner = cpu; |
1da177e4 | 489 | console_verbose(); |
1209140c JB |
490 | bust_spinlocks(1); |
491 | return flags; | |
1da177e4 LT |
492 | } |
493 | ||
eddb6fb9 | 494 | void __kprobes oops_end(unsigned long flags) |
1da177e4 LT |
495 | { |
496 | die_owner = -1; | |
1209140c | 497 | bust_spinlocks(0); |
cdc60a4c CM |
498 | die_nest_count--; |
499 | if (die_nest_count) | |
500 | /* We still own the lock */ | |
501 | local_irq_restore(flags); | |
502 | else | |
503 | /* Nest count reaches zero, release the lock. */ | |
504 | spin_unlock_irqrestore(&die_lock, flags); | |
1da177e4 | 505 | if (panic_on_oops) |
012c437d | 506 | panic("Fatal exception"); |
abf0f109 | 507 | oops_exit(); |
1209140c | 508 | } |
1da177e4 | 509 | |
eddb6fb9 | 510 | void __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
511 | { |
512 | static int die_counter; | |
513 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
514 | #ifdef CONFIG_PREEMPT | |
515 | printk("PREEMPT "); | |
516 | #endif | |
517 | #ifdef CONFIG_SMP | |
518 | printk("SMP "); | |
519 | #endif | |
520 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
521 | printk("DEBUG_PAGEALLOC"); | |
522 | #endif | |
523 | printk("\n"); | |
6e3f3617 | 524 | notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); |
1da177e4 | 525 | show_registers(regs); |
bcdcd8e7 | 526 | add_taint(TAINT_DIE); |
1da177e4 LT |
527 | /* Executive summary in case the oops scrolled away */ |
528 | printk(KERN_ALERT "RIP "); | |
529 | printk_address(regs->rip); | |
530 | printk(" RSP <%016lx>\n", regs->rsp); | |
8bcc5280 VG |
531 | if (kexec_should_crash(current)) |
532 | crash_kexec(regs); | |
1da177e4 LT |
533 | } |
534 | ||
535 | void die(const char * str, struct pt_regs * regs, long err) | |
536 | { | |
1209140c JB |
537 | unsigned long flags = oops_begin(); |
538 | ||
c31a0bf3 | 539 | if (!user_mode(regs)) |
608e2619 | 540 | report_bug(regs->rip, regs); |
c31a0bf3 | 541 | |
1da177e4 | 542 | __die(str, regs, err); |
1209140c | 543 | oops_end(flags); |
1da177e4 LT |
544 | do_exit(SIGSEGV); |
545 | } | |
1da177e4 | 546 | |
fac58550 | 547 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 548 | { |
1209140c JB |
549 | unsigned long flags = oops_begin(); |
550 | ||
1da177e4 LT |
551 | /* |
552 | * We are in trouble anyway, lets at least try | |
553 | * to get a message out. | |
554 | */ | |
151f8cc1 | 555 | printk(str, smp_processor_id()); |
1da177e4 | 556 | show_registers(regs); |
8bcc5280 VG |
557 | if (kexec_should_crash(current)) |
558 | crash_kexec(regs); | |
fac58550 AK |
559 | if (do_panic || panic_on_oops) |
560 | panic("Non maskable interrupt"); | |
1209140c | 561 | oops_end(flags); |
8b1ffe95 CM |
562 | nmi_exit(); |
563 | local_irq_enable(); | |
1da177e4 LT |
564 | do_exit(SIGSEGV); |
565 | } | |
566 | ||
0f2fbdcb PP |
567 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
568 | struct pt_regs * regs, long error_code, | |
569 | siginfo_t *info) | |
1da177e4 | 570 | { |
6e3f3617 JB |
571 | struct task_struct *tsk = current; |
572 | ||
6e3f3617 | 573 | if (user_mode(regs)) { |
d1895183 AK |
574 | /* |
575 | * We want error_code and trap_no set for userspace | |
576 | * faults and kernelspace faults which result in | |
577 | * die(), but not kernelspace faults which are fixed | |
578 | * up. die() gives the process no chance to handle | |
579 | * the signal and notice the kernel fault information, | |
580 | * so that won't result in polluting the information | |
581 | * about previously queued, but not yet delivered, | |
582 | * faults. See also do_general_protection below. | |
583 | */ | |
584 | tsk->thread.error_code = error_code; | |
585 | tsk->thread.trap_no = trapnr; | |
586 | ||
abd4f750 MAS |
587 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
588 | printk_ratelimit()) | |
1da177e4 LT |
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; |
d1895183 AK |
608 | else { |
609 | tsk->thread.error_code = error_code; | |
610 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 611 | die(str, regs, error_code); |
d1895183 | 612 | } |
1da177e4 LT |
613 | return; |
614 | } | |
615 | } | |
616 | ||
617 | #define DO_ERROR(trapnr, signr, str, name) \ | |
618 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
619 | { \ | |
620 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
621 | == NOTIFY_STOP) \ | |
622 | return; \ | |
40e59a61 | 623 | conditional_sti(regs); \ |
1da177e4 LT |
624 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
625 | } | |
626 | ||
627 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
628 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
629 | { \ | |
630 | siginfo_t info; \ | |
631 | info.si_signo = signr; \ | |
632 | info.si_errno = 0; \ | |
633 | info.si_code = sicode; \ | |
634 | info.si_addr = (void __user *)siaddr; \ | |
635 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
636 | == NOTIFY_STOP) \ | |
637 | return; \ | |
40e59a61 | 638 | conditional_sti(regs); \ |
1da177e4 LT |
639 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
640 | } | |
641 | ||
642 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip) | |
643 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) | |
644 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
100c0e36 | 645 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip) |
1da177e4 LT |
646 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
647 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
648 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
649 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
650 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
651 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
652 | |
653 | /* Runs on IST stack */ | |
654 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
655 | { | |
656 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
657 | 12, SIGBUS) == NOTIFY_STOP) | |
658 | return; | |
659 | preempt_conditional_sti(regs); | |
660 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
661 | preempt_conditional_cli(regs); | |
662 | } | |
eca37c18 JB |
663 | |
664 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
665 | { | |
666 | static const char str[] = "double fault"; | |
667 | struct task_struct *tsk = current; | |
668 | ||
669 | /* Return not checked because double check cannot be ignored */ | |
670 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
671 | ||
672 | tsk->thread.error_code = error_code; | |
673 | tsk->thread.trap_no = 8; | |
674 | ||
675 | /* This is always a kernel trap and never fixable (and thus must | |
676 | never return). */ | |
677 | for (;;) | |
678 | die(str, regs, error_code); | |
679 | } | |
1da177e4 | 680 | |
0f2fbdcb PP |
681 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
682 | long error_code) | |
1da177e4 | 683 | { |
6e3f3617 JB |
684 | struct task_struct *tsk = current; |
685 | ||
1da177e4 LT |
686 | conditional_sti(regs); |
687 | ||
6e3f3617 | 688 | if (user_mode(regs)) { |
d1895183 AK |
689 | tsk->thread.error_code = error_code; |
690 | tsk->thread.trap_no = 13; | |
691 | ||
abd4f750 MAS |
692 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
693 | printk_ratelimit()) | |
1da177e4 LT |
694 | printk(KERN_INFO |
695 | "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n", | |
696 | tsk->comm, tsk->pid, | |
2b692a87 | 697 | regs->rip, regs->rsp, error_code); |
1da177e4 | 698 | |
1da177e4 LT |
699 | force_sig(SIGSEGV, tsk); |
700 | return; | |
701 | } | |
702 | ||
703 | /* kernel gp */ | |
704 | { | |
705 | const struct exception_table_entry *fixup; | |
706 | fixup = search_exception_tables(regs->rip); | |
707 | if (fixup) { | |
708 | regs->rip = fixup->fixup; | |
709 | return; | |
710 | } | |
d1895183 AK |
711 | |
712 | tsk->thread.error_code = error_code; | |
713 | tsk->thread.trap_no = 13; | |
1da177e4 LT |
714 | if (notify_die(DIE_GPF, "general protection fault", regs, |
715 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
716 | return; | |
717 | die("general protection fault", regs, error_code); | |
718 | } | |
719 | } | |
720 | ||
eddb6fb9 AK |
721 | static __kprobes void |
722 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 723 | { |
c41c5cd3 DZ |
724 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
725 | reason); | |
9c5f8be4 | 726 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 727 | |
c0d12172 DJ |
728 | #if defined(CONFIG_EDAC) |
729 | if(edac_handler_set()) { | |
730 | edac_atomic_assert_error(); | |
731 | return; | |
732 | } | |
733 | #endif | |
734 | ||
8da5adda | 735 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
736 | panic("NMI: Not continuing"); |
737 | ||
738 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
739 | |
740 | /* Clear and disable the memory parity error line. */ | |
741 | reason = (reason & 0xf) | 4; | |
742 | outb(reason, 0x61); | |
743 | } | |
744 | ||
eddb6fb9 AK |
745 | static __kprobes void |
746 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
747 | { |
748 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
749 | show_registers(regs); | |
750 | ||
751 | /* Re-enable the IOCK line, wait for a few seconds */ | |
752 | reason = (reason & 0xf) | 8; | |
753 | outb(reason, 0x61); | |
754 | mdelay(2000); | |
755 | reason &= ~8; | |
756 | outb(reason, 0x61); | |
757 | } | |
758 | ||
eddb6fb9 AK |
759 | static __kprobes void |
760 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 DZ |
761 | { |
762 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", | |
763 | reason); | |
764 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
765 | |
766 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 767 | panic("NMI: Not continuing"); |
8da5adda | 768 | |
c41c5cd3 | 769 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
770 | } |
771 | ||
6fefb0d1 AK |
772 | /* Runs on IST stack. This code must keep interrupts off all the time. |
773 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 774 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
775 | { |
776 | unsigned char reason = 0; | |
76e4f660 AR |
777 | int cpu; |
778 | ||
779 | cpu = smp_processor_id(); | |
1da177e4 LT |
780 | |
781 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 782 | if (!cpu) |
1da177e4 LT |
783 | reason = get_nmi_reason(); |
784 | ||
785 | if (!(reason & 0xc0)) { | |
6e3f3617 | 786 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
787 | == NOTIFY_STOP) |
788 | return; | |
1da177e4 LT |
789 | /* |
790 | * Ok, so this is none of the documented NMI sources, | |
791 | * so it must be the NMI watchdog. | |
792 | */ | |
3adbbcce | 793 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 794 | return; |
3adbbcce | 795 | if (!do_nmi_callback(regs,cpu)) |
3adbbcce DZ |
796 | unknown_nmi_error(reason, regs); |
797 | ||
1da177e4 LT |
798 | return; |
799 | } | |
6e3f3617 | 800 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
801 | return; |
802 | ||
803 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
804 | ||
805 | if (reason & 0x80) | |
806 | mem_parity_error(reason, regs); | |
807 | if (reason & 0x40) | |
808 | io_check_error(reason, regs); | |
809 | } | |
810 | ||
b556b35e | 811 | /* runs on IST stack. */ |
0f2fbdcb | 812 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 LT |
813 | { |
814 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { | |
815 | return; | |
816 | } | |
40e59a61 | 817 | preempt_conditional_sti(regs); |
1da177e4 | 818 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 819 | preempt_conditional_cli(regs); |
1da177e4 LT |
820 | } |
821 | ||
6fefb0d1 AK |
822 | /* Help handler running on IST stack to switch back to user stack |
823 | for scheduling or signal handling. The actual stack switch is done in | |
824 | entry.S */ | |
eddb6fb9 | 825 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
826 | { |
827 | struct pt_regs *regs = eregs; | |
828 | /* Did already sync */ | |
829 | if (eregs == (struct pt_regs *)eregs->rsp) | |
830 | ; | |
831 | /* Exception from user space */ | |
76381fee | 832 | else if (user_mode(eregs)) |
bb049232 | 833 | regs = task_pt_regs(current); |
6fefb0d1 AK |
834 | /* Exception from kernel and interrupts are enabled. Move to |
835 | kernel process stack. */ | |
836 | else if (eregs->eflags & X86_EFLAGS_IF) | |
837 | regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs)); | |
838 | if (eregs != regs) | |
839 | *regs = *eregs; | |
840 | return regs; | |
841 | } | |
842 | ||
1da177e4 | 843 | /* runs on IST stack. */ |
0f2fbdcb PP |
844 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
845 | unsigned long error_code) | |
1da177e4 | 846 | { |
1da177e4 LT |
847 | unsigned long condition; |
848 | struct task_struct *tsk = current; | |
849 | siginfo_t info; | |
850 | ||
e9129e56 | 851 | get_debugreg(condition, 6); |
1da177e4 LT |
852 | |
853 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, | |
daeeafec | 854 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 855 | return; |
daeeafec | 856 | |
a65d17c9 | 857 | preempt_conditional_sti(regs); |
1da177e4 LT |
858 | |
859 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
860 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
861 | if (!tsk->thread.debugreg7) { | |
862 | goto clear_dr7; | |
863 | } | |
864 | } | |
865 | ||
866 | tsk->thread.debugreg6 = condition; | |
867 | ||
868 | /* Mask out spurious TF errors due to lazy TF clearing */ | |
daeeafec | 869 | if (condition & DR_STEP) { |
1da177e4 LT |
870 | /* |
871 | * The TF error should be masked out only if the current | |
872 | * process is not traced and if the TRAP flag has been set | |
873 | * previously by a tracing process (condition detected by | |
874 | * the PT_DTRACE flag); remember that the i386 TRAP flag | |
875 | * can be modified by the process itself in user mode, | |
876 | * allowing programs to debug themselves without the ptrace() | |
877 | * interface. | |
878 | */ | |
76381fee | 879 | if (!user_mode(regs)) |
1da177e4 | 880 | goto clear_TF_reenable; |
be61bff7 AK |
881 | /* |
882 | * Was the TF flag set by a debugger? If so, clear it now, | |
883 | * so that register information is correct. | |
884 | */ | |
885 | if (tsk->ptrace & PT_DTRACE) { | |
886 | regs->eflags &= ~TF_MASK; | |
887 | tsk->ptrace &= ~PT_DTRACE; | |
888 | } | |
1da177e4 LT |
889 | } |
890 | ||
891 | /* Ok, finally something we can handle */ | |
892 | tsk->thread.trap_no = 1; | |
893 | tsk->thread.error_code = error_code; | |
894 | info.si_signo = SIGTRAP; | |
895 | info.si_errno = 0; | |
896 | info.si_code = TRAP_BRKPT; | |
01b8faae JB |
897 | info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL; |
898 | force_sig_info(SIGTRAP, &info, tsk); | |
1da177e4 | 899 | |
1da177e4 | 900 | clear_dr7: |
e9129e56 | 901 | set_debugreg(0UL, 7); |
a65d17c9 | 902 | preempt_conditional_cli(regs); |
6fefb0d1 | 903 | return; |
1da177e4 LT |
904 | |
905 | clear_TF_reenable: | |
906 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
1da177e4 | 907 | regs->eflags &= ~TF_MASK; |
a65d17c9 | 908 | preempt_conditional_cli(regs); |
1da177e4 LT |
909 | } |
910 | ||
6e3f3617 | 911 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 LT |
912 | { |
913 | const struct exception_table_entry *fixup; | |
914 | fixup = search_exception_tables(regs->rip); | |
915 | if (fixup) { | |
916 | regs->rip = fixup->fixup; | |
917 | return 1; | |
918 | } | |
6e3f3617 | 919 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 920 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 921 | current->thread.trap_no = trapnr; |
1da177e4 | 922 | die(str, regs, 0); |
1da177e4 LT |
923 | return 0; |
924 | } | |
925 | ||
926 | /* | |
927 | * Note that we play around with the 'TS' bit in an attempt to get | |
928 | * the correct behaviour even in the presence of the asynchronous | |
929 | * IRQ13 behaviour | |
930 | */ | |
931 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
932 | { | |
933 | void __user *rip = (void __user *)(regs->rip); | |
934 | struct task_struct * task; | |
935 | siginfo_t info; | |
936 | unsigned short cwd, swd; | |
937 | ||
938 | conditional_sti(regs); | |
76381fee | 939 | if (!user_mode(regs) && |
6e3f3617 | 940 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
941 | return; |
942 | ||
943 | /* | |
944 | * Save the info for the exception handler and clear the error. | |
945 | */ | |
946 | task = current; | |
947 | save_init_fpu(task); | |
948 | task->thread.trap_no = 16; | |
949 | task->thread.error_code = 0; | |
950 | info.si_signo = SIGFPE; | |
951 | info.si_errno = 0; | |
952 | info.si_code = __SI_FAULT; | |
953 | info.si_addr = rip; | |
954 | /* | |
955 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
956 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
957 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
958 | * fault bit. We should only be taking one exception at a time, | |
959 | * so if this combination doesn't produce any single exception, | |
960 | * then we have a bad program that isn't synchronizing its FPU usage | |
961 | * and it will suffer the consequences since we won't be able to | |
962 | * fully reproduce the context of the exception | |
963 | */ | |
964 | cwd = get_fpu_cwd(task); | |
965 | swd = get_fpu_swd(task); | |
ff347b22 | 966 | switch (swd & ~cwd & 0x3f) { |
1da177e4 LT |
967 | case 0x000: |
968 | default: | |
969 | break; | |
970 | case 0x001: /* Invalid Op */ | |
ff347b22 CE |
971 | /* |
972 | * swd & 0x240 == 0x040: Stack Underflow | |
973 | * swd & 0x240 == 0x240: Stack Overflow | |
974 | * User must clear the SF bit (0x40) if set | |
975 | */ | |
1da177e4 LT |
976 | info.si_code = FPE_FLTINV; |
977 | break; | |
978 | case 0x002: /* Denormalize */ | |
979 | case 0x010: /* Underflow */ | |
980 | info.si_code = FPE_FLTUND; | |
981 | break; | |
982 | case 0x004: /* Zero Divide */ | |
983 | info.si_code = FPE_FLTDIV; | |
984 | break; | |
985 | case 0x008: /* Overflow */ | |
986 | info.si_code = FPE_FLTOVF; | |
987 | break; | |
988 | case 0x020: /* Precision */ | |
989 | info.si_code = FPE_FLTRES; | |
990 | break; | |
991 | } | |
992 | force_sig_info(SIGFPE, &info, task); | |
993 | } | |
994 | ||
995 | asmlinkage void bad_intr(void) | |
996 | { | |
997 | printk("bad interrupt"); | |
998 | } | |
999 | ||
1000 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
1001 | { | |
1002 | void __user *rip = (void __user *)(regs->rip); | |
1003 | struct task_struct * task; | |
1004 | siginfo_t info; | |
1005 | unsigned short mxcsr; | |
1006 | ||
1007 | conditional_sti(regs); | |
76381fee | 1008 | if (!user_mode(regs) && |
6e3f3617 | 1009 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
1010 | return; |
1011 | ||
1012 | /* | |
1013 | * Save the info for the exception handler and clear the error. | |
1014 | */ | |
1015 | task = current; | |
1016 | save_init_fpu(task); | |
1017 | task->thread.trap_no = 19; | |
1018 | task->thread.error_code = 0; | |
1019 | info.si_signo = SIGFPE; | |
1020 | info.si_errno = 0; | |
1021 | info.si_code = __SI_FAULT; | |
1022 | info.si_addr = rip; | |
1023 | /* | |
1024 | * The SIMD FPU exceptions are handled a little differently, as there | |
1025 | * is only a single status/control register. Thus, to determine which | |
1026 | * unmasked exception was caught we must mask the exception mask bits | |
1027 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1028 | */ | |
1029 | mxcsr = get_fpu_mxcsr(task); | |
1030 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
1031 | case 0x000: | |
1032 | default: | |
1033 | break; | |
1034 | case 0x001: /* Invalid Op */ | |
1035 | info.si_code = FPE_FLTINV; | |
1036 | break; | |
1037 | case 0x002: /* Denormalize */ | |
1038 | case 0x010: /* Underflow */ | |
1039 | info.si_code = FPE_FLTUND; | |
1040 | break; | |
1041 | case 0x004: /* Zero Divide */ | |
1042 | info.si_code = FPE_FLTDIV; | |
1043 | break; | |
1044 | case 0x008: /* Overflow */ | |
1045 | info.si_code = FPE_FLTOVF; | |
1046 | break; | |
1047 | case 0x020: /* Precision */ | |
1048 | info.si_code = FPE_FLTRES; | |
1049 | break; | |
1050 | } | |
1051 | force_sig_info(SIGFPE, &info, task); | |
1052 | } | |
1053 | ||
1054 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1055 | { | |
1056 | } | |
1057 | ||
1058 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1059 | { |
1060 | } | |
1061 | ||
1062 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1063 | { |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * 'math_state_restore()' saves the current math information in the | |
1068 | * old math state array, and gets the new ones from the current task | |
1069 | * | |
1070 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1071 | * Don't touch unless you *really* know how it works. | |
1072 | */ | |
1073 | asmlinkage void math_state_restore(void) | |
1074 | { | |
1075 | struct task_struct *me = current; | |
1076 | clts(); /* Allow maths ops (or we recurse) */ | |
1077 | ||
1078 | if (!used_math()) | |
1079 | init_fpu(me); | |
1080 | restore_fpu_checking(&me->thread.i387.fxsave); | |
e4f17c43 | 1081 | task_thread_info(me)->status |= TS_USEDFPU; |
e07e23e1 | 1082 | me->fpu_counter++; |
1da177e4 LT |
1083 | } |
1084 | ||
1da177e4 LT |
1085 | void __init trap_init(void) |
1086 | { | |
1087 | set_intr_gate(0,÷_error); | |
1088 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1089 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1090 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1091 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1092 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1093 | set_intr_gate(6,&invalid_op); |
1094 | set_intr_gate(7,&device_not_available); | |
1095 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1096 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1097 | set_intr_gate(10,&invalid_TSS); | |
1098 | set_intr_gate(11,&segment_not_present); | |
1099 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1100 | set_intr_gate(13,&general_protection); | |
1101 | set_intr_gate(14,&page_fault); | |
1102 | set_intr_gate(15,&spurious_interrupt_bug); | |
1103 | set_intr_gate(16,&coprocessor_error); | |
1104 | set_intr_gate(17,&alignment_check); | |
1105 | #ifdef CONFIG_X86_MCE | |
1106 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1107 | #endif | |
1108 | set_intr_gate(19,&simd_coprocessor_error); | |
1109 | ||
1110 | #ifdef CONFIG_IA32_EMULATION | |
1111 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1112 | #endif | |
1113 | ||
1da177e4 LT |
1114 | /* |
1115 | * Should be a barrier for any external CPU state. | |
1116 | */ | |
1117 | cpu_init(); | |
1118 | } | |
1119 | ||
1120 | ||
2c8c0e6b | 1121 | static int __init oops_setup(char *s) |
1da177e4 | 1122 | { |
2c8c0e6b AK |
1123 | if (!s) |
1124 | return -EINVAL; | |
1125 | if (!strcmp(s, "panic")) | |
1126 | panic_on_oops = 1; | |
1127 | return 0; | |
1da177e4 | 1128 | } |
2c8c0e6b | 1129 | early_param("oops", oops_setup); |
1da177e4 LT |
1130 | |
1131 | static int __init kstack_setup(char *s) | |
1132 | { | |
2c8c0e6b AK |
1133 | if (!s) |
1134 | return -EINVAL; | |
1da177e4 | 1135 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
2c8c0e6b | 1136 | return 0; |
1da177e4 | 1137 | } |
2c8c0e6b | 1138 | early_param("kstack", kstack_setup); |