Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1991, 1992 Linus Torvalds |
3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs | |
4 | * | |
5 | * Pentium III FXSR, SSE support | |
6 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
1da177e4 LT |
7 | */ |
8 | ||
9 | /* | |
10 | * 'Traps.c' handles hardware traps and faults after we have saved some | |
11 | * state in 'entry.S'. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/sched.h> |
14 | #include <linux/kernel.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/interrupt.h> | |
4b0ff1a9 | 24 | #include <linux/kallsyms.h> |
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/moduleparam.h> | |
35faa714 | 27 | #include <linux/nmi.h> |
0f2fbdcb | 28 | #include <linux/kprobes.h> |
8bcc5280 | 29 | #include <linux/kexec.h> |
b538ed27 | 30 | #include <linux/unwind.h> |
ab2bf0c1 | 31 | #include <linux/uaccess.h> |
c31a0bf3 | 32 | #include <linux/bug.h> |
1eeb66a1 | 33 | #include <linux/kdebug.h> |
1da177e4 | 34 | |
c0d12172 DJ |
35 | #if defined(CONFIG_EDAC) |
36 | #include <linux/edac.h> | |
37 | #endif | |
38 | ||
1da177e4 | 39 | #include <asm/system.h> |
1da177e4 LT |
40 | #include <asm/io.h> |
41 | #include <asm/atomic.h> | |
42 | #include <asm/debugreg.h> | |
43 | #include <asm/desc.h> | |
44 | #include <asm/i387.h> | |
1da177e4 | 45 | #include <asm/processor.h> |
b538ed27 | 46 | #include <asm/unwind.h> |
1da177e4 LT |
47 | #include <asm/smp.h> |
48 | #include <asm/pgalloc.h> | |
49 | #include <asm/pda.h> | |
50 | #include <asm/proto.h> | |
51 | #include <asm/nmi.h> | |
c0b766f1 | 52 | #include <asm/stacktrace.h> |
1da177e4 | 53 | |
1da177e4 LT |
54 | asmlinkage void divide_error(void); |
55 | asmlinkage void debug(void); | |
56 | asmlinkage void nmi(void); | |
57 | asmlinkage void int3(void); | |
58 | asmlinkage void overflow(void); | |
59 | asmlinkage void bounds(void); | |
60 | asmlinkage void invalid_op(void); | |
61 | asmlinkage void device_not_available(void); | |
62 | asmlinkage void double_fault(void); | |
63 | asmlinkage void coprocessor_segment_overrun(void); | |
64 | asmlinkage void invalid_TSS(void); | |
65 | asmlinkage void segment_not_present(void); | |
66 | asmlinkage void stack_segment(void); | |
67 | asmlinkage void general_protection(void); | |
68 | asmlinkage void page_fault(void); | |
69 | asmlinkage void coprocessor_error(void); | |
70 | asmlinkage void simd_coprocessor_error(void); | |
71 | asmlinkage void reserved(void); | |
72 | asmlinkage void alignment_check(void); | |
73 | asmlinkage void machine_check(void); | |
74 | asmlinkage void spurious_interrupt_bug(void); | |
1da177e4 | 75 | |
1da177e4 LT |
76 | static inline void conditional_sti(struct pt_regs *regs) |
77 | { | |
78 | if (regs->eflags & X86_EFLAGS_IF) | |
79 | local_irq_enable(); | |
80 | } | |
81 | ||
a65d17c9 JB |
82 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
83 | { | |
84 | preempt_disable(); | |
85 | if (regs->eflags & X86_EFLAGS_IF) | |
86 | local_irq_enable(); | |
87 | } | |
88 | ||
89 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
90 | { | |
91 | if (regs->eflags & X86_EFLAGS_IF) | |
92 | local_irq_disable(); | |
40e59a61 AK |
93 | /* Make sure to not schedule here because we could be running |
94 | on an exception stack. */ | |
a65d17c9 JB |
95 | preempt_enable_no_resched(); |
96 | } | |
97 | ||
0741f4d2 | 98 | int kstack_depth_to_print = 12; |
1da177e4 LT |
99 | |
100 | #ifdef CONFIG_KALLSYMS | |
3ac94932 IM |
101 | void printk_address(unsigned long address) |
102 | { | |
1da177e4 LT |
103 | unsigned long offset = 0, symsize; |
104 | const char *symname; | |
105 | char *modname; | |
3ac94932 | 106 | char *delim = ":"; |
1da177e4 LT |
107 | char namebuf[128]; |
108 | ||
3ac94932 IM |
109 | symname = kallsyms_lookup(address, &symsize, &offset, |
110 | &modname, namebuf); | |
111 | if (!symname) { | |
112 | printk(" [<%016lx>]\n", address); | |
113 | return; | |
114 | } | |
115 | if (!modname) | |
1da177e4 | 116 | modname = delim = ""; |
3ac94932 IM |
117 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
118 | address, delim, modname, delim, symname, offset, symsize); | |
119 | } | |
1da177e4 | 120 | #else |
3ac94932 IM |
121 | void printk_address(unsigned long address) |
122 | { | |
123 | printk(" [<%016lx>]\n", address); | |
124 | } | |
1da177e4 LT |
125 | #endif |
126 | ||
0a658002 | 127 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 128 | unsigned *usedp, char **idp) |
0a658002 | 129 | { |
b556b35e | 130 | static char ids[][8] = { |
0a658002 AK |
131 | [DEBUG_STACK - 1] = "#DB", |
132 | [NMI_STACK - 1] = "NMI", | |
133 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
134 | [STACKFAULT_STACK - 1] = "#SS", | |
135 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
136 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
137 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
138 | #endif | |
0a658002 AK |
139 | }; |
140 | unsigned k; | |
1da177e4 | 141 | |
c9ca1ba5 IM |
142 | /* |
143 | * Iterate over all exception stacks, and figure out whether | |
144 | * 'stack' is in one of them: | |
145 | */ | |
0a658002 | 146 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 147 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
148 | /* |
149 | * Is 'stack' above this exception frame's end? | |
150 | * If yes then skip to the next frame. | |
151 | */ | |
0a658002 AK |
152 | if (stack >= end) |
153 | continue; | |
c9ca1ba5 IM |
154 | /* |
155 | * Is 'stack' above this exception frame's start address? | |
156 | * If yes then we found the right frame. | |
157 | */ | |
0a658002 | 158 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
159 | /* |
160 | * Make sure we only iterate through an exception | |
161 | * stack once. If it comes up for the second time | |
162 | * then there's something wrong going on - just | |
163 | * break out and return NULL: | |
164 | */ | |
0a658002 AK |
165 | if (*usedp & (1U << k)) |
166 | break; | |
167 | *usedp |= 1U << k; | |
168 | *idp = ids[k]; | |
169 | return (unsigned long *)end; | |
170 | } | |
c9ca1ba5 IM |
171 | /* |
172 | * If this is a debug stack, and if it has a larger size than | |
173 | * the usual exception stacks, then 'stack' might still | |
174 | * be within the lower portion of the debug stack: | |
175 | */ | |
b556b35e JB |
176 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
177 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
178 | unsigned j = N_EXCEPTION_STACKS - 1; | |
179 | ||
c9ca1ba5 IM |
180 | /* |
181 | * Black magic. A large debug stack is composed of | |
182 | * multiple exception stack entries, which we | |
183 | * iterate through now. Dont look: | |
184 | */ | |
b556b35e JB |
185 | do { |
186 | ++j; | |
187 | end -= EXCEPTION_STKSZ; | |
188 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
189 | } while (stack < end - EXCEPTION_STKSZ); | |
190 | if (*usedp & (1U << j)) | |
191 | break; | |
192 | *usedp |= 1U << j; | |
193 | *idp = ids[j]; | |
194 | return (unsigned long *)end; | |
195 | } | |
196 | #endif | |
1da177e4 LT |
197 | } |
198 | return NULL; | |
0a658002 | 199 | } |
1da177e4 | 200 | |
b615ebda AK |
201 | #define MSG(txt) ops->warning(data, txt) |
202 | ||
1da177e4 | 203 | /* |
676b1855 | 204 | * x86-64 can have up to three kernel stacks: |
1da177e4 LT |
205 | * process stack |
206 | * interrupt stack | |
0a658002 | 207 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
208 | */ |
209 | ||
c547c77e AK |
210 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
211 | { | |
212 | void *t = (void *)tinfo; | |
213 | return p > t && p < t + THREAD_SIZE - 3; | |
214 | } | |
215 | ||
b615ebda AK |
216 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
217 | unsigned long *stack, | |
9689ba8a | 218 | const struct stacktrace_ops *ops, void *data) |
1da177e4 | 219 | { |
da68933e | 220 | const unsigned cpu = get_cpu(); |
b615ebda | 221 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 222 | unsigned used = 0; |
c547c77e | 223 | struct thread_info *tinfo; |
1da177e4 | 224 | |
b538ed27 JB |
225 | if (!tsk) |
226 | tsk = current; | |
227 | ||
c0b766f1 AK |
228 | if (!stack) { |
229 | unsigned long dummy; | |
230 | stack = &dummy; | |
231 | if (tsk && tsk != current) | |
232 | stack = (unsigned long *)tsk->thread.rsp; | |
b538ed27 JB |
233 | } |
234 | ||
c9ca1ba5 IM |
235 | /* |
236 | * Print function call entries within a stack. 'cond' is the | |
237 | * "end of stackframe" condition, that the 'stack++' | |
238 | * iteration will eventually trigger. | |
239 | */ | |
0a658002 AK |
240 | #define HANDLE_STACK(cond) \ |
241 | do while (cond) { \ | |
1b2f6304 | 242 | unsigned long addr = *stack++; \ |
446f713b AK |
243 | /* Use unlocked access here because except for NMIs \ |
244 | we should be already protected against module unloads */ \ | |
245 | if (__kernel_text_address(addr)) { \ | |
0a658002 AK |
246 | /* \ |
247 | * If the address is either in the text segment of the \ | |
248 | * kernel, or in the region which contains vmalloc'ed \ | |
249 | * memory, it *may* be the address of a calling \ | |
250 | * routine; if so, print it so that someone tracing \ | |
251 | * down the cause of the crash will be able to figure \ | |
252 | * out the call path that was taken. \ | |
253 | */ \ | |
c0b766f1 | 254 | ops->address(data, addr); \ |
0a658002 AK |
255 | } \ |
256 | } while (0) | |
257 | ||
c9ca1ba5 IM |
258 | /* |
259 | * Print function call entries in all stacks, starting at the | |
260 | * current stack address. If the stacks consist of nested | |
261 | * exceptions | |
262 | */ | |
c0b766f1 AK |
263 | for (;;) { |
264 | char *id; | |
0a658002 AK |
265 | unsigned long *estack_end; |
266 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
267 | &used, &id); | |
268 | ||
269 | if (estack_end) { | |
c0b766f1 AK |
270 | if (ops->stack(data, id) < 0) |
271 | break; | |
0a658002 | 272 | HANDLE_STACK (stack < estack_end); |
c0b766f1 | 273 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
274 | /* |
275 | * We link to the next stack via the | |
276 | * second-to-last pointer (index -2 to end) in the | |
277 | * exception stack: | |
278 | */ | |
0a658002 AK |
279 | stack = (unsigned long *) estack_end[-2]; |
280 | continue; | |
1da177e4 | 281 | } |
0a658002 AK |
282 | if (irqstack_end) { |
283 | unsigned long *irqstack; | |
284 | irqstack = irqstack_end - | |
285 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
286 | ||
287 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
288 | if (ops->stack(data, "IRQ") < 0) |
289 | break; | |
0a658002 | 290 | HANDLE_STACK (stack < irqstack_end); |
c9ca1ba5 IM |
291 | /* |
292 | * We link to the next stack (which would be | |
293 | * the process stack normally) the last | |
294 | * pointer (index -1 to end) in the IRQ stack: | |
295 | */ | |
0a658002 AK |
296 | stack = (unsigned long *) (irqstack_end[-1]); |
297 | irqstack_end = NULL; | |
c0b766f1 | 298 | ops->stack(data, "EOI"); |
0a658002 | 299 | continue; |
1da177e4 | 300 | } |
1da177e4 | 301 | } |
0a658002 | 302 | break; |
1da177e4 | 303 | } |
0a658002 | 304 | |
c9ca1ba5 | 305 | /* |
c0b766f1 | 306 | * This handles the process stack: |
c9ca1ba5 | 307 | */ |
7523c4dd | 308 | tinfo = task_thread_info(tsk); |
c547c77e | 309 | HANDLE_STACK (valid_stack_ptr(tinfo, stack)); |
0a658002 | 310 | #undef HANDLE_STACK |
da68933e | 311 | put_cpu(); |
c0b766f1 AK |
312 | } |
313 | EXPORT_SYMBOL(dump_trace); | |
314 | ||
315 | static void | |
316 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
317 | { | |
318 | print_symbol(msg, symbol); | |
319 | printk("\n"); | |
320 | } | |
321 | ||
322 | static void print_trace_warning(void *data, char *msg) | |
323 | { | |
324 | printk("%s\n", msg); | |
325 | } | |
326 | ||
327 | static int print_trace_stack(void *data, char *name) | |
328 | { | |
329 | printk(" <%s> ", name); | |
330 | return 0; | |
331 | } | |
3ac94932 | 332 | |
c0b766f1 AK |
333 | static void print_trace_address(void *data, unsigned long addr) |
334 | { | |
1c978b93 | 335 | touch_nmi_watchdog(); |
c0b766f1 AK |
336 | printk_address(addr); |
337 | } | |
338 | ||
9689ba8a | 339 | static const struct stacktrace_ops print_trace_ops = { |
c0b766f1 AK |
340 | .warning = print_trace_warning, |
341 | .warning_symbol = print_trace_warning_symbol, | |
342 | .stack = print_trace_stack, | |
343 | .address = print_trace_address, | |
344 | }; | |
345 | ||
346 | void | |
347 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) | |
348 | { | |
349 | printk("\nCall Trace:\n"); | |
350 | dump_trace(tsk, regs, stack, &print_trace_ops, NULL); | |
1da177e4 LT |
351 | printk("\n"); |
352 | } | |
353 | ||
c0b766f1 AK |
354 | static void |
355 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp) | |
1da177e4 LT |
356 | { |
357 | unsigned long *stack; | |
358 | int i; | |
151f8cc1 | 359 | const int cpu = smp_processor_id(); |
df79efde RT |
360 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
361 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
362 | |
363 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
364 | // back trace for this cpu. | |
365 | ||
366 | if (rsp == NULL) { | |
367 | if (tsk) | |
368 | rsp = (unsigned long *)tsk->thread.rsp; | |
369 | else | |
370 | rsp = (unsigned long *)&rsp; | |
371 | } | |
372 | ||
373 | stack = rsp; | |
374 | for(i=0; i < kstack_depth_to_print; i++) { | |
375 | if (stack >= irqstack && stack <= irqstack_end) { | |
376 | if (stack == irqstack_end) { | |
377 | stack = (unsigned long *) (irqstack_end[-1]); | |
378 | printk(" <EOI> "); | |
379 | } | |
380 | } else { | |
381 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
382 | break; | |
383 | } | |
384 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
385 | printk("\n"); |
386 | printk(" %016lx", *stack++); | |
35faa714 | 387 | touch_nmi_watchdog(); |
1da177e4 | 388 | } |
b538ed27 JB |
389 | show_trace(tsk, regs, rsp); |
390 | } | |
391 | ||
392 | void show_stack(struct task_struct *tsk, unsigned long * rsp) | |
393 | { | |
394 | _show_stack(tsk, NULL, rsp); | |
1da177e4 LT |
395 | } |
396 | ||
397 | /* | |
398 | * The architecture-independent dump_stack generator | |
399 | */ | |
400 | void dump_stack(void) | |
401 | { | |
402 | unsigned long dummy; | |
b538ed27 | 403 | show_trace(NULL, NULL, &dummy); |
1da177e4 LT |
404 | } |
405 | ||
406 | EXPORT_SYMBOL(dump_stack); | |
407 | ||
408 | void show_registers(struct pt_regs *regs) | |
409 | { | |
410 | int i; | |
76381fee | 411 | int in_kernel = !user_mode(regs); |
1da177e4 | 412 | unsigned long rsp; |
151f8cc1 | 413 | const int cpu = smp_processor_id(); |
df79efde | 414 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 | 415 | |
d039c688 | 416 | rsp = regs->rsp; |
1da177e4 LT |
417 | printk("CPU %d ", cpu); |
418 | __show_regs(regs); | |
419 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 420 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
421 | |
422 | /* | |
423 | * When in-kernel, we also print out the stack and code at the | |
424 | * time of the fault.. | |
425 | */ | |
426 | if (in_kernel) { | |
1da177e4 | 427 | printk("Stack: "); |
b538ed27 | 428 | _show_stack(NULL, regs, (unsigned long*)rsp); |
1da177e4 LT |
429 | |
430 | printk("\nCode: "); | |
2b692a87 | 431 | if (regs->rip < PAGE_OFFSET) |
1da177e4 LT |
432 | goto bad; |
433 | ||
2b692a87 | 434 | for (i=0; i<20; i++) { |
1da177e4 | 435 | unsigned char c; |
2b692a87 | 436 | if (__get_user(c, &((unsigned char*)regs->rip)[i])) { |
1da177e4 LT |
437 | bad: |
438 | printk(" Bad RIP value."); | |
439 | break; | |
440 | } | |
441 | printk("%02x ", c); | |
442 | } | |
443 | } | |
444 | printk("\n"); | |
445 | } | |
446 | ||
c31a0bf3 JF |
447 | int is_valid_bugaddr(unsigned long rip) |
448 | { | |
449 | unsigned short ud2; | |
450 | ||
451 | if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2))) | |
452 | return 0; | |
453 | ||
454 | return ud2 == 0x0b0f; | |
455 | } | |
1da177e4 | 456 | |
4f60fdf6 | 457 | #ifdef CONFIG_BUG |
1da177e4 LT |
458 | void out_of_line_bug(void) |
459 | { | |
460 | BUG(); | |
461 | } | |
2ee60e17 | 462 | EXPORT_SYMBOL(out_of_line_bug); |
4f60fdf6 | 463 | #endif |
1da177e4 | 464 | |
39743c9e | 465 | static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; |
1da177e4 | 466 | static int die_owner = -1; |
cdc60a4c | 467 | static unsigned int die_nest_count; |
1da177e4 | 468 | |
eddb6fb9 | 469 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 470 | { |
b39b7036 | 471 | int cpu; |
1209140c JB |
472 | unsigned long flags; |
473 | ||
abf0f109 AM |
474 | oops_enter(); |
475 | ||
1209140c | 476 | /* racy, but better than risking deadlock. */ |
39743c9e | 477 | raw_local_irq_save(flags); |
b39b7036 | 478 | cpu = smp_processor_id(); |
39743c9e | 479 | if (!__raw_spin_trylock(&die_lock)) { |
1da177e4 LT |
480 | if (cpu == die_owner) |
481 | /* nested oops. should stop eventually */; | |
482 | else | |
39743c9e | 483 | __raw_spin_lock(&die_lock); |
1da177e4 | 484 | } |
cdc60a4c | 485 | die_nest_count++; |
1209140c | 486 | die_owner = cpu; |
1da177e4 | 487 | console_verbose(); |
1209140c JB |
488 | bust_spinlocks(1); |
489 | return flags; | |
1da177e4 LT |
490 | } |
491 | ||
eddb6fb9 | 492 | void __kprobes oops_end(unsigned long flags) |
1da177e4 LT |
493 | { |
494 | die_owner = -1; | |
1209140c | 495 | bust_spinlocks(0); |
cdc60a4c | 496 | die_nest_count--; |
39743c9e | 497 | if (!die_nest_count) |
cdc60a4c | 498 | /* Nest count reaches zero, release the lock. */ |
39743c9e AK |
499 | __raw_spin_unlock(&die_lock); |
500 | raw_local_irq_restore(flags); | |
1da177e4 | 501 | if (panic_on_oops) |
012c437d | 502 | panic("Fatal exception"); |
abf0f109 | 503 | oops_exit(); |
1209140c | 504 | } |
1da177e4 | 505 | |
eddb6fb9 | 506 | void __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
507 | { |
508 | static int die_counter; | |
509 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
510 | #ifdef CONFIG_PREEMPT | |
511 | printk("PREEMPT "); | |
512 | #endif | |
513 | #ifdef CONFIG_SMP | |
514 | printk("SMP "); | |
515 | #endif | |
516 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
517 | printk("DEBUG_PAGEALLOC"); | |
518 | #endif | |
519 | printk("\n"); | |
6e3f3617 | 520 | notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); |
1da177e4 | 521 | show_registers(regs); |
bcdcd8e7 | 522 | add_taint(TAINT_DIE); |
1da177e4 LT |
523 | /* Executive summary in case the oops scrolled away */ |
524 | printk(KERN_ALERT "RIP "); | |
525 | printk_address(regs->rip); | |
526 | printk(" RSP <%016lx>\n", regs->rsp); | |
8bcc5280 VG |
527 | if (kexec_should_crash(current)) |
528 | crash_kexec(regs); | |
1da177e4 LT |
529 | } |
530 | ||
531 | void die(const char * str, struct pt_regs * regs, long err) | |
532 | { | |
1209140c JB |
533 | unsigned long flags = oops_begin(); |
534 | ||
c31a0bf3 | 535 | if (!user_mode(regs)) |
608e2619 | 536 | report_bug(regs->rip, regs); |
c31a0bf3 | 537 | |
1da177e4 | 538 | __die(str, regs, err); |
1209140c | 539 | oops_end(flags); |
1da177e4 LT |
540 | do_exit(SIGSEGV); |
541 | } | |
1da177e4 | 542 | |
fac58550 | 543 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 544 | { |
1209140c JB |
545 | unsigned long flags = oops_begin(); |
546 | ||
1da177e4 LT |
547 | /* |
548 | * We are in trouble anyway, lets at least try | |
549 | * to get a message out. | |
550 | */ | |
151f8cc1 | 551 | printk(str, smp_processor_id()); |
1da177e4 | 552 | show_registers(regs); |
8bcc5280 VG |
553 | if (kexec_should_crash(current)) |
554 | crash_kexec(regs); | |
fac58550 AK |
555 | if (do_panic || panic_on_oops) |
556 | panic("Non maskable interrupt"); | |
1209140c | 557 | oops_end(flags); |
8b1ffe95 CM |
558 | nmi_exit(); |
559 | local_irq_enable(); | |
1da177e4 LT |
560 | do_exit(SIGSEGV); |
561 | } | |
562 | ||
0f2fbdcb PP |
563 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
564 | struct pt_regs * regs, long error_code, | |
565 | siginfo_t *info) | |
1da177e4 | 566 | { |
6e3f3617 JB |
567 | struct task_struct *tsk = current; |
568 | ||
6e3f3617 | 569 | if (user_mode(regs)) { |
d1895183 AK |
570 | /* |
571 | * We want error_code and trap_no set for userspace | |
572 | * faults and kernelspace faults which result in | |
573 | * die(), but not kernelspace faults which are fixed | |
574 | * up. die() gives the process no chance to handle | |
575 | * the signal and notice the kernel fault information, | |
576 | * so that won't result in polluting the information | |
577 | * about previously queued, but not yet delivered, | |
578 | * faults. See also do_general_protection below. | |
579 | */ | |
580 | tsk->thread.error_code = error_code; | |
581 | tsk->thread.trap_no = trapnr; | |
582 | ||
abd4f750 MAS |
583 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
584 | printk_ratelimit()) | |
1da177e4 LT |
585 | printk(KERN_INFO |
586 | "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n", | |
587 | tsk->comm, tsk->pid, str, | |
2b692a87 | 588 | regs->rip, regs->rsp, error_code); |
1da177e4 | 589 | |
1da177e4 LT |
590 | if (info) |
591 | force_sig_info(signr, info, tsk); | |
592 | else | |
593 | force_sig(signr, tsk); | |
594 | return; | |
595 | } | |
596 | ||
597 | ||
598 | /* kernel trap */ | |
599 | { | |
600 | const struct exception_table_entry *fixup; | |
601 | fixup = search_exception_tables(regs->rip); | |
2b692a87 | 602 | if (fixup) |
1da177e4 | 603 | regs->rip = fixup->fixup; |
d1895183 AK |
604 | else { |
605 | tsk->thread.error_code = error_code; | |
606 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 607 | die(str, regs, error_code); |
d1895183 | 608 | } |
1da177e4 LT |
609 | return; |
610 | } | |
611 | } | |
612 | ||
613 | #define DO_ERROR(trapnr, signr, str, name) \ | |
614 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
615 | { \ | |
616 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
617 | == NOTIFY_STOP) \ | |
618 | return; \ | |
40e59a61 | 619 | conditional_sti(regs); \ |
1da177e4 LT |
620 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
621 | } | |
622 | ||
623 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
624 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
625 | { \ | |
626 | siginfo_t info; \ | |
627 | info.si_signo = signr; \ | |
628 | info.si_errno = 0; \ | |
629 | info.si_code = sicode; \ | |
630 | info.si_addr = (void __user *)siaddr; \ | |
631 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
632 | == NOTIFY_STOP) \ | |
633 | return; \ | |
40e59a61 | 634 | conditional_sti(regs); \ |
1da177e4 LT |
635 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
636 | } | |
637 | ||
638 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip) | |
639 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) | |
640 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
100c0e36 | 641 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip) |
1da177e4 LT |
642 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
643 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
644 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
645 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
646 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
647 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
648 | |
649 | /* Runs on IST stack */ | |
650 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
651 | { | |
652 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
653 | 12, SIGBUS) == NOTIFY_STOP) | |
654 | return; | |
655 | preempt_conditional_sti(regs); | |
656 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
657 | preempt_conditional_cli(regs); | |
658 | } | |
eca37c18 JB |
659 | |
660 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
661 | { | |
662 | static const char str[] = "double fault"; | |
663 | struct task_struct *tsk = current; | |
664 | ||
665 | /* Return not checked because double check cannot be ignored */ | |
666 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
667 | ||
668 | tsk->thread.error_code = error_code; | |
669 | tsk->thread.trap_no = 8; | |
670 | ||
671 | /* This is always a kernel trap and never fixable (and thus must | |
672 | never return). */ | |
673 | for (;;) | |
674 | die(str, regs, error_code); | |
675 | } | |
1da177e4 | 676 | |
0f2fbdcb PP |
677 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
678 | long error_code) | |
1da177e4 | 679 | { |
6e3f3617 JB |
680 | struct task_struct *tsk = current; |
681 | ||
1da177e4 LT |
682 | conditional_sti(regs); |
683 | ||
6e3f3617 | 684 | if (user_mode(regs)) { |
d1895183 AK |
685 | tsk->thread.error_code = error_code; |
686 | tsk->thread.trap_no = 13; | |
687 | ||
abd4f750 MAS |
688 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
689 | printk_ratelimit()) | |
1da177e4 LT |
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 | } | |
d1895183 AK |
707 | |
708 | tsk->thread.error_code = error_code; | |
709 | tsk->thread.trap_no = 13; | |
1da177e4 LT |
710 | if (notify_die(DIE_GPF, "general protection fault", regs, |
711 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
712 | return; | |
713 | die("general protection fault", regs, error_code); | |
714 | } | |
715 | } | |
716 | ||
eddb6fb9 AK |
717 | static __kprobes void |
718 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 719 | { |
c41c5cd3 DZ |
720 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
721 | reason); | |
9c5f8be4 | 722 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 723 | |
c0d12172 DJ |
724 | #if defined(CONFIG_EDAC) |
725 | if(edac_handler_set()) { | |
726 | edac_atomic_assert_error(); | |
727 | return; | |
728 | } | |
729 | #endif | |
730 | ||
8da5adda | 731 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
732 | panic("NMI: Not continuing"); |
733 | ||
734 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
735 | |
736 | /* Clear and disable the memory parity error line. */ | |
737 | reason = (reason & 0xf) | 4; | |
738 | outb(reason, 0x61); | |
739 | } | |
740 | ||
eddb6fb9 AK |
741 | static __kprobes void |
742 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
743 | { |
744 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
745 | show_registers(regs); | |
746 | ||
747 | /* Re-enable the IOCK line, wait for a few seconds */ | |
748 | reason = (reason & 0xf) | 8; | |
749 | outb(reason, 0x61); | |
750 | mdelay(2000); | |
751 | reason &= ~8; | |
752 | outb(reason, 0x61); | |
753 | } | |
754 | ||
eddb6fb9 AK |
755 | static __kprobes void |
756 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 DZ |
757 | { |
758 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", | |
759 | reason); | |
760 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
761 | |
762 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 763 | panic("NMI: Not continuing"); |
8da5adda | 764 | |
c41c5cd3 | 765 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
766 | } |
767 | ||
6fefb0d1 AK |
768 | /* Runs on IST stack. This code must keep interrupts off all the time. |
769 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 770 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
771 | { |
772 | unsigned char reason = 0; | |
76e4f660 AR |
773 | int cpu; |
774 | ||
775 | cpu = smp_processor_id(); | |
1da177e4 LT |
776 | |
777 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 778 | if (!cpu) |
1da177e4 LT |
779 | reason = get_nmi_reason(); |
780 | ||
781 | if (!(reason & 0xc0)) { | |
6e3f3617 | 782 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
783 | == NOTIFY_STOP) |
784 | return; | |
1da177e4 LT |
785 | /* |
786 | * Ok, so this is none of the documented NMI sources, | |
787 | * so it must be the NMI watchdog. | |
788 | */ | |
3adbbcce | 789 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 790 | return; |
3adbbcce | 791 | if (!do_nmi_callback(regs,cpu)) |
3adbbcce DZ |
792 | unknown_nmi_error(reason, regs); |
793 | ||
1da177e4 LT |
794 | return; |
795 | } | |
6e3f3617 | 796 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
797 | return; |
798 | ||
799 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
800 | ||
801 | if (reason & 0x80) | |
802 | mem_parity_error(reason, regs); | |
803 | if (reason & 0x40) | |
804 | io_check_error(reason, regs); | |
805 | } | |
806 | ||
b556b35e | 807 | /* runs on IST stack. */ |
0f2fbdcb | 808 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 LT |
809 | { |
810 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { | |
811 | return; | |
812 | } | |
40e59a61 | 813 | preempt_conditional_sti(regs); |
1da177e4 | 814 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 815 | preempt_conditional_cli(regs); |
1da177e4 LT |
816 | } |
817 | ||
6fefb0d1 AK |
818 | /* Help handler running on IST stack to switch back to user stack |
819 | for scheduling or signal handling. The actual stack switch is done in | |
820 | entry.S */ | |
eddb6fb9 | 821 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
822 | { |
823 | struct pt_regs *regs = eregs; | |
824 | /* Did already sync */ | |
825 | if (eregs == (struct pt_regs *)eregs->rsp) | |
826 | ; | |
827 | /* Exception from user space */ | |
76381fee | 828 | else if (user_mode(eregs)) |
bb049232 | 829 | regs = task_pt_regs(current); |
6fefb0d1 AK |
830 | /* Exception from kernel and interrupts are enabled. Move to |
831 | kernel process stack. */ | |
832 | else if (eregs->eflags & X86_EFLAGS_IF) | |
833 | regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs)); | |
834 | if (eregs != regs) | |
835 | *regs = *eregs; | |
836 | return regs; | |
837 | } | |
838 | ||
1da177e4 | 839 | /* runs on IST stack. */ |
0f2fbdcb PP |
840 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
841 | unsigned long error_code) | |
1da177e4 | 842 | { |
1da177e4 LT |
843 | unsigned long condition; |
844 | struct task_struct *tsk = current; | |
845 | siginfo_t info; | |
846 | ||
e9129e56 | 847 | get_debugreg(condition, 6); |
1da177e4 LT |
848 | |
849 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, | |
daeeafec | 850 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 851 | return; |
daeeafec | 852 | |
a65d17c9 | 853 | preempt_conditional_sti(regs); |
1da177e4 LT |
854 | |
855 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
856 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
857 | if (!tsk->thread.debugreg7) { | |
858 | goto clear_dr7; | |
859 | } | |
860 | } | |
861 | ||
862 | tsk->thread.debugreg6 = condition; | |
863 | ||
864 | /* Mask out spurious TF errors due to lazy TF clearing */ | |
daeeafec | 865 | if (condition & DR_STEP) { |
1da177e4 LT |
866 | /* |
867 | * The TF error should be masked out only if the current | |
868 | * process is not traced and if the TRAP flag has been set | |
869 | * previously by a tracing process (condition detected by | |
870 | * the PT_DTRACE flag); remember that the i386 TRAP flag | |
871 | * can be modified by the process itself in user mode, | |
872 | * allowing programs to debug themselves without the ptrace() | |
873 | * interface. | |
874 | */ | |
76381fee | 875 | if (!user_mode(regs)) |
1da177e4 | 876 | goto clear_TF_reenable; |
be61bff7 AK |
877 | /* |
878 | * Was the TF flag set by a debugger? If so, clear it now, | |
879 | * so that register information is correct. | |
880 | */ | |
881 | if (tsk->ptrace & PT_DTRACE) { | |
882 | regs->eflags &= ~TF_MASK; | |
883 | tsk->ptrace &= ~PT_DTRACE; | |
884 | } | |
1da177e4 LT |
885 | } |
886 | ||
887 | /* Ok, finally something we can handle */ | |
888 | tsk->thread.trap_no = 1; | |
889 | tsk->thread.error_code = error_code; | |
890 | info.si_signo = SIGTRAP; | |
891 | info.si_errno = 0; | |
892 | info.si_code = TRAP_BRKPT; | |
01b8faae JB |
893 | info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL; |
894 | force_sig_info(SIGTRAP, &info, tsk); | |
1da177e4 | 895 | |
1da177e4 | 896 | clear_dr7: |
e9129e56 | 897 | set_debugreg(0UL, 7); |
a65d17c9 | 898 | preempt_conditional_cli(regs); |
6fefb0d1 | 899 | return; |
1da177e4 LT |
900 | |
901 | clear_TF_reenable: | |
902 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
1da177e4 | 903 | regs->eflags &= ~TF_MASK; |
a65d17c9 | 904 | preempt_conditional_cli(regs); |
1da177e4 LT |
905 | } |
906 | ||
6e3f3617 | 907 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 LT |
908 | { |
909 | const struct exception_table_entry *fixup; | |
910 | fixup = search_exception_tables(regs->rip); | |
911 | if (fixup) { | |
912 | regs->rip = fixup->fixup; | |
913 | return 1; | |
914 | } | |
6e3f3617 | 915 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 916 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 917 | current->thread.trap_no = trapnr; |
1da177e4 | 918 | die(str, regs, 0); |
1da177e4 LT |
919 | return 0; |
920 | } | |
921 | ||
922 | /* | |
923 | * Note that we play around with the 'TS' bit in an attempt to get | |
924 | * the correct behaviour even in the presence of the asynchronous | |
925 | * IRQ13 behaviour | |
926 | */ | |
927 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
928 | { | |
929 | void __user *rip = (void __user *)(regs->rip); | |
930 | struct task_struct * task; | |
931 | siginfo_t info; | |
932 | unsigned short cwd, swd; | |
933 | ||
934 | conditional_sti(regs); | |
76381fee | 935 | if (!user_mode(regs) && |
6e3f3617 | 936 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
937 | return; |
938 | ||
939 | /* | |
940 | * Save the info for the exception handler and clear the error. | |
941 | */ | |
942 | task = current; | |
943 | save_init_fpu(task); | |
944 | task->thread.trap_no = 16; | |
945 | task->thread.error_code = 0; | |
946 | info.si_signo = SIGFPE; | |
947 | info.si_errno = 0; | |
948 | info.si_code = __SI_FAULT; | |
949 | info.si_addr = rip; | |
950 | /* | |
951 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
952 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
953 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
954 | * fault bit. We should only be taking one exception at a time, | |
955 | * so if this combination doesn't produce any single exception, | |
956 | * then we have a bad program that isn't synchronizing its FPU usage | |
957 | * and it will suffer the consequences since we won't be able to | |
958 | * fully reproduce the context of the exception | |
959 | */ | |
960 | cwd = get_fpu_cwd(task); | |
961 | swd = get_fpu_swd(task); | |
ff347b22 | 962 | switch (swd & ~cwd & 0x3f) { |
1da177e4 LT |
963 | case 0x000: |
964 | default: | |
965 | break; | |
966 | case 0x001: /* Invalid Op */ | |
ff347b22 CE |
967 | /* |
968 | * swd & 0x240 == 0x040: Stack Underflow | |
969 | * swd & 0x240 == 0x240: Stack Overflow | |
970 | * User must clear the SF bit (0x40) if set | |
971 | */ | |
1da177e4 LT |
972 | info.si_code = FPE_FLTINV; |
973 | break; | |
974 | case 0x002: /* Denormalize */ | |
975 | case 0x010: /* Underflow */ | |
976 | info.si_code = FPE_FLTUND; | |
977 | break; | |
978 | case 0x004: /* Zero Divide */ | |
979 | info.si_code = FPE_FLTDIV; | |
980 | break; | |
981 | case 0x008: /* Overflow */ | |
982 | info.si_code = FPE_FLTOVF; | |
983 | break; | |
984 | case 0x020: /* Precision */ | |
985 | info.si_code = FPE_FLTRES; | |
986 | break; | |
987 | } | |
988 | force_sig_info(SIGFPE, &info, task); | |
989 | } | |
990 | ||
991 | asmlinkage void bad_intr(void) | |
992 | { | |
993 | printk("bad interrupt"); | |
994 | } | |
995 | ||
996 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
997 | { | |
998 | void __user *rip = (void __user *)(regs->rip); | |
999 | struct task_struct * task; | |
1000 | siginfo_t info; | |
1001 | unsigned short mxcsr; | |
1002 | ||
1003 | conditional_sti(regs); | |
76381fee | 1004 | if (!user_mode(regs) && |
6e3f3617 | 1005 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
1006 | return; |
1007 | ||
1008 | /* | |
1009 | * Save the info for the exception handler and clear the error. | |
1010 | */ | |
1011 | task = current; | |
1012 | save_init_fpu(task); | |
1013 | task->thread.trap_no = 19; | |
1014 | task->thread.error_code = 0; | |
1015 | info.si_signo = SIGFPE; | |
1016 | info.si_errno = 0; | |
1017 | info.si_code = __SI_FAULT; | |
1018 | info.si_addr = rip; | |
1019 | /* | |
1020 | * The SIMD FPU exceptions are handled a little differently, as there | |
1021 | * is only a single status/control register. Thus, to determine which | |
1022 | * unmasked exception was caught we must mask the exception mask bits | |
1023 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1024 | */ | |
1025 | mxcsr = get_fpu_mxcsr(task); | |
1026 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
1027 | case 0x000: | |
1028 | default: | |
1029 | break; | |
1030 | case 0x001: /* Invalid Op */ | |
1031 | info.si_code = FPE_FLTINV; | |
1032 | break; | |
1033 | case 0x002: /* Denormalize */ | |
1034 | case 0x010: /* Underflow */ | |
1035 | info.si_code = FPE_FLTUND; | |
1036 | break; | |
1037 | case 0x004: /* Zero Divide */ | |
1038 | info.si_code = FPE_FLTDIV; | |
1039 | break; | |
1040 | case 0x008: /* Overflow */ | |
1041 | info.si_code = FPE_FLTOVF; | |
1042 | break; | |
1043 | case 0x020: /* Precision */ | |
1044 | info.si_code = FPE_FLTRES; | |
1045 | break; | |
1046 | } | |
1047 | force_sig_info(SIGFPE, &info, task); | |
1048 | } | |
1049 | ||
1050 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1051 | { | |
1052 | } | |
1053 | ||
1054 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1055 | { |
1056 | } | |
1057 | ||
1058 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1059 | { |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * 'math_state_restore()' saves the current math information in the | |
1064 | * old math state array, and gets the new ones from the current task | |
1065 | * | |
1066 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1067 | * Don't touch unless you *really* know how it works. | |
1068 | */ | |
1069 | asmlinkage void math_state_restore(void) | |
1070 | { | |
1071 | struct task_struct *me = current; | |
1072 | clts(); /* Allow maths ops (or we recurse) */ | |
1073 | ||
1074 | if (!used_math()) | |
1075 | init_fpu(me); | |
1076 | restore_fpu_checking(&me->thread.i387.fxsave); | |
e4f17c43 | 1077 | task_thread_info(me)->status |= TS_USEDFPU; |
e07e23e1 | 1078 | me->fpu_counter++; |
1da177e4 LT |
1079 | } |
1080 | ||
1da177e4 LT |
1081 | void __init trap_init(void) |
1082 | { | |
1083 | set_intr_gate(0,÷_error); | |
1084 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1085 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1086 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1087 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1088 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1089 | set_intr_gate(6,&invalid_op); |
1090 | set_intr_gate(7,&device_not_available); | |
1091 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1092 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1093 | set_intr_gate(10,&invalid_TSS); | |
1094 | set_intr_gate(11,&segment_not_present); | |
1095 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1096 | set_intr_gate(13,&general_protection); | |
1097 | set_intr_gate(14,&page_fault); | |
1098 | set_intr_gate(15,&spurious_interrupt_bug); | |
1099 | set_intr_gate(16,&coprocessor_error); | |
1100 | set_intr_gate(17,&alignment_check); | |
1101 | #ifdef CONFIG_X86_MCE | |
1102 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1103 | #endif | |
1104 | set_intr_gate(19,&simd_coprocessor_error); | |
1105 | ||
1106 | #ifdef CONFIG_IA32_EMULATION | |
1107 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1108 | #endif | |
1109 | ||
1da177e4 LT |
1110 | /* |
1111 | * Should be a barrier for any external CPU state. | |
1112 | */ | |
1113 | cpu_init(); | |
1114 | } | |
1115 | ||
1116 | ||
2c8c0e6b | 1117 | static int __init oops_setup(char *s) |
1da177e4 | 1118 | { |
2c8c0e6b AK |
1119 | if (!s) |
1120 | return -EINVAL; | |
1121 | if (!strcmp(s, "panic")) | |
1122 | panic_on_oops = 1; | |
1123 | return 0; | |
1da177e4 | 1124 | } |
2c8c0e6b | 1125 | early_param("oops", oops_setup); |
1da177e4 LT |
1126 | |
1127 | static int __init kstack_setup(char *s) | |
1128 | { | |
2c8c0e6b AK |
1129 | if (!s) |
1130 | return -EINVAL; | |
1da177e4 | 1131 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
2c8c0e6b | 1132 | return 0; |
1da177e4 | 1133 | } |
2c8c0e6b | 1134 | early_param("kstack", kstack_setup); |