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 LT |
36 | |
37 | #include <asm/system.h> | |
1da177e4 LT |
38 | #include <asm/io.h> |
39 | #include <asm/atomic.h> | |
40 | #include <asm/debugreg.h> | |
41 | #include <asm/desc.h> | |
42 | #include <asm/i387.h> | |
1da177e4 | 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 | |
1da177e4 LT |
74 | static inline void conditional_sti(struct pt_regs *regs) |
75 | { | |
76 | if (regs->eflags & X86_EFLAGS_IF) | |
77 | local_irq_enable(); | |
78 | } | |
79 | ||
a65d17c9 JB |
80 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
81 | { | |
82 | preempt_disable(); | |
83 | if (regs->eflags & X86_EFLAGS_IF) | |
84 | local_irq_enable(); | |
85 | } | |
86 | ||
87 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
88 | { | |
89 | if (regs->eflags & X86_EFLAGS_IF) | |
90 | local_irq_disable(); | |
40e59a61 AK |
91 | /* Make sure to not schedule here because we could be running |
92 | on an exception stack. */ | |
a65d17c9 JB |
93 | preempt_enable_no_resched(); |
94 | } | |
95 | ||
0741f4d2 | 96 | int kstack_depth_to_print = 12; |
1da177e4 LT |
97 | |
98 | #ifdef CONFIG_KALLSYMS | |
3ac94932 IM |
99 | void printk_address(unsigned long address) |
100 | { | |
1da177e4 LT |
101 | unsigned long offset = 0, symsize; |
102 | const char *symname; | |
103 | char *modname; | |
3ac94932 | 104 | char *delim = ":"; |
1da177e4 LT |
105 | char namebuf[128]; |
106 | ||
3ac94932 IM |
107 | symname = kallsyms_lookup(address, &symsize, &offset, |
108 | &modname, namebuf); | |
109 | if (!symname) { | |
110 | printk(" [<%016lx>]\n", address); | |
111 | return; | |
112 | } | |
113 | if (!modname) | |
1da177e4 | 114 | modname = delim = ""; |
3ac94932 IM |
115 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
116 | address, delim, modname, delim, symname, offset, symsize); | |
117 | } | |
1da177e4 | 118 | #else |
3ac94932 IM |
119 | void printk_address(unsigned long address) |
120 | { | |
121 | printk(" [<%016lx>]\n", address); | |
122 | } | |
1da177e4 LT |
123 | #endif |
124 | ||
0a658002 | 125 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 126 | unsigned *usedp, char **idp) |
0a658002 | 127 | { |
b556b35e | 128 | static char ids[][8] = { |
0a658002 AK |
129 | [DEBUG_STACK - 1] = "#DB", |
130 | [NMI_STACK - 1] = "NMI", | |
131 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
132 | [STACKFAULT_STACK - 1] = "#SS", | |
133 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
134 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
135 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
136 | #endif | |
0a658002 AK |
137 | }; |
138 | unsigned k; | |
1da177e4 | 139 | |
c9ca1ba5 IM |
140 | /* |
141 | * Iterate over all exception stacks, and figure out whether | |
142 | * 'stack' is in one of them: | |
143 | */ | |
0a658002 | 144 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 145 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
146 | /* |
147 | * Is 'stack' above this exception frame's end? | |
148 | * If yes then skip to the next frame. | |
149 | */ | |
0a658002 AK |
150 | if (stack >= end) |
151 | continue; | |
c9ca1ba5 IM |
152 | /* |
153 | * Is 'stack' above this exception frame's start address? | |
154 | * If yes then we found the right frame. | |
155 | */ | |
0a658002 | 156 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
157 | /* |
158 | * Make sure we only iterate through an exception | |
159 | * stack once. If it comes up for the second time | |
160 | * then there's something wrong going on - just | |
161 | * break out and return NULL: | |
162 | */ | |
0a658002 AK |
163 | if (*usedp & (1U << k)) |
164 | break; | |
165 | *usedp |= 1U << k; | |
166 | *idp = ids[k]; | |
167 | return (unsigned long *)end; | |
168 | } | |
c9ca1ba5 IM |
169 | /* |
170 | * If this is a debug stack, and if it has a larger size than | |
171 | * the usual exception stacks, then 'stack' might still | |
172 | * be within the lower portion of the debug stack: | |
173 | */ | |
b556b35e JB |
174 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
175 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
176 | unsigned j = N_EXCEPTION_STACKS - 1; | |
177 | ||
c9ca1ba5 IM |
178 | /* |
179 | * Black magic. A large debug stack is composed of | |
180 | * multiple exception stack entries, which we | |
181 | * iterate through now. Dont look: | |
182 | */ | |
b556b35e JB |
183 | do { |
184 | ++j; | |
185 | end -= EXCEPTION_STKSZ; | |
186 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
187 | } while (stack < end - EXCEPTION_STKSZ); | |
188 | if (*usedp & (1U << j)) | |
189 | break; | |
190 | *usedp |= 1U << j; | |
191 | *idp = ids[j]; | |
192 | return (unsigned long *)end; | |
193 | } | |
194 | #endif | |
1da177e4 LT |
195 | } |
196 | return NULL; | |
0a658002 | 197 | } |
1da177e4 | 198 | |
b615ebda AK |
199 | #define MSG(txt) ops->warning(data, txt) |
200 | ||
1da177e4 LT |
201 | /* |
202 | * x86-64 can have upto three kernel stacks: | |
203 | * process stack | |
204 | * interrupt stack | |
0a658002 | 205 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
206 | */ |
207 | ||
c547c77e AK |
208 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
209 | { | |
210 | void *t = (void *)tinfo; | |
211 | return p > t && p < t + THREAD_SIZE - 3; | |
212 | } | |
213 | ||
b615ebda AK |
214 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
215 | unsigned long *stack, | |
c0b766f1 | 216 | struct stacktrace_ops *ops, void *data) |
1da177e4 | 217 | { |
da68933e | 218 | const unsigned cpu = get_cpu(); |
b615ebda | 219 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 220 | unsigned used = 0; |
c547c77e | 221 | struct thread_info *tinfo; |
1da177e4 | 222 | |
b538ed27 JB |
223 | if (!tsk) |
224 | tsk = current; | |
225 | ||
c0b766f1 AK |
226 | if (!stack) { |
227 | unsigned long dummy; | |
228 | stack = &dummy; | |
229 | if (tsk && tsk != current) | |
230 | stack = (unsigned long *)tsk->thread.rsp; | |
b538ed27 JB |
231 | } |
232 | ||
c9ca1ba5 IM |
233 | /* |
234 | * Print function call entries within a stack. 'cond' is the | |
235 | * "end of stackframe" condition, that the 'stack++' | |
236 | * iteration will eventually trigger. | |
237 | */ | |
0a658002 AK |
238 | #define HANDLE_STACK(cond) \ |
239 | do while (cond) { \ | |
1b2f6304 | 240 | unsigned long addr = *stack++; \ |
446f713b AK |
241 | /* Use unlocked access here because except for NMIs \ |
242 | we should be already protected against module unloads */ \ | |
243 | if (__kernel_text_address(addr)) { \ | |
0a658002 AK |
244 | /* \ |
245 | * If the address is either in the text segment of the \ | |
246 | * kernel, or in the region which contains vmalloc'ed \ | |
247 | * memory, it *may* be the address of a calling \ | |
248 | * routine; if so, print it so that someone tracing \ | |
249 | * down the cause of the crash will be able to figure \ | |
250 | * out the call path that was taken. \ | |
251 | */ \ | |
c0b766f1 | 252 | ops->address(data, addr); \ |
0a658002 AK |
253 | } \ |
254 | } while (0) | |
255 | ||
c9ca1ba5 IM |
256 | /* |
257 | * Print function call entries in all stacks, starting at the | |
258 | * current stack address. If the stacks consist of nested | |
259 | * exceptions | |
260 | */ | |
c0b766f1 AK |
261 | for (;;) { |
262 | char *id; | |
0a658002 AK |
263 | unsigned long *estack_end; |
264 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
265 | &used, &id); | |
266 | ||
267 | if (estack_end) { | |
c0b766f1 AK |
268 | if (ops->stack(data, id) < 0) |
269 | break; | |
0a658002 | 270 | HANDLE_STACK (stack < estack_end); |
c0b766f1 | 271 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
272 | /* |
273 | * We link to the next stack via the | |
274 | * second-to-last pointer (index -2 to end) in the | |
275 | * exception stack: | |
276 | */ | |
0a658002 AK |
277 | stack = (unsigned long *) estack_end[-2]; |
278 | continue; | |
1da177e4 | 279 | } |
0a658002 AK |
280 | if (irqstack_end) { |
281 | unsigned long *irqstack; | |
282 | irqstack = irqstack_end - | |
283 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
284 | ||
285 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
286 | if (ops->stack(data, "IRQ") < 0) |
287 | break; | |
0a658002 | 288 | HANDLE_STACK (stack < irqstack_end); |
c9ca1ba5 IM |
289 | /* |
290 | * We link to the next stack (which would be | |
291 | * the process stack normally) the last | |
292 | * pointer (index -1 to end) in the IRQ stack: | |
293 | */ | |
0a658002 AK |
294 | stack = (unsigned long *) (irqstack_end[-1]); |
295 | irqstack_end = NULL; | |
c0b766f1 | 296 | ops->stack(data, "EOI"); |
0a658002 | 297 | continue; |
1da177e4 | 298 | } |
1da177e4 | 299 | } |
0a658002 | 300 | break; |
1da177e4 | 301 | } |
0a658002 | 302 | |
c9ca1ba5 | 303 | /* |
c0b766f1 | 304 | * This handles the process stack: |
c9ca1ba5 | 305 | */ |
7523c4dd | 306 | tinfo = task_thread_info(tsk); |
c547c77e | 307 | HANDLE_STACK (valid_stack_ptr(tinfo, stack)); |
0a658002 | 308 | #undef HANDLE_STACK |
da68933e | 309 | put_cpu(); |
c0b766f1 AK |
310 | } |
311 | EXPORT_SYMBOL(dump_trace); | |
312 | ||
313 | static void | |
314 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
315 | { | |
316 | print_symbol(msg, symbol); | |
317 | printk("\n"); | |
318 | } | |
319 | ||
320 | static void print_trace_warning(void *data, char *msg) | |
321 | { | |
322 | printk("%s\n", msg); | |
323 | } | |
324 | ||
325 | static int print_trace_stack(void *data, char *name) | |
326 | { | |
327 | printk(" <%s> ", name); | |
328 | return 0; | |
329 | } | |
3ac94932 | 330 | |
c0b766f1 AK |
331 | static void print_trace_address(void *data, unsigned long addr) |
332 | { | |
333 | printk_address(addr); | |
334 | } | |
335 | ||
336 | static struct stacktrace_ops print_trace_ops = { | |
337 | .warning = print_trace_warning, | |
338 | .warning_symbol = print_trace_warning_symbol, | |
339 | .stack = print_trace_stack, | |
340 | .address = print_trace_address, | |
341 | }; | |
342 | ||
343 | void | |
344 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) | |
345 | { | |
346 | printk("\nCall Trace:\n"); | |
347 | dump_trace(tsk, regs, stack, &print_trace_ops, NULL); | |
1da177e4 LT |
348 | printk("\n"); |
349 | } | |
350 | ||
c0b766f1 AK |
351 | static void |
352 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp) | |
1da177e4 LT |
353 | { |
354 | unsigned long *stack; | |
355 | int i; | |
151f8cc1 | 356 | const int cpu = smp_processor_id(); |
df79efde RT |
357 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
358 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
359 | |
360 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
361 | // back trace for this cpu. | |
362 | ||
363 | if (rsp == NULL) { | |
364 | if (tsk) | |
365 | rsp = (unsigned long *)tsk->thread.rsp; | |
366 | else | |
367 | rsp = (unsigned long *)&rsp; | |
368 | } | |
369 | ||
370 | stack = rsp; | |
371 | for(i=0; i < kstack_depth_to_print; i++) { | |
372 | if (stack >= irqstack && stack <= irqstack_end) { | |
373 | if (stack == irqstack_end) { | |
374 | stack = (unsigned long *) (irqstack_end[-1]); | |
375 | printk(" <EOI> "); | |
376 | } | |
377 | } else { | |
378 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
379 | break; | |
380 | } | |
381 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
382 | printk("\n"); |
383 | printk(" %016lx", *stack++); | |
35faa714 | 384 | touch_nmi_watchdog(); |
1da177e4 | 385 | } |
b538ed27 JB |
386 | show_trace(tsk, regs, rsp); |
387 | } | |
388 | ||
389 | void show_stack(struct task_struct *tsk, unsigned long * rsp) | |
390 | { | |
391 | _show_stack(tsk, NULL, rsp); | |
1da177e4 LT |
392 | } |
393 | ||
394 | /* | |
395 | * The architecture-independent dump_stack generator | |
396 | */ | |
397 | void dump_stack(void) | |
398 | { | |
399 | unsigned long dummy; | |
b538ed27 | 400 | show_trace(NULL, NULL, &dummy); |
1da177e4 LT |
401 | } |
402 | ||
403 | EXPORT_SYMBOL(dump_stack); | |
404 | ||
405 | void show_registers(struct pt_regs *regs) | |
406 | { | |
407 | int i; | |
76381fee | 408 | int in_kernel = !user_mode(regs); |
1da177e4 | 409 | unsigned long rsp; |
151f8cc1 | 410 | const int cpu = smp_processor_id(); |
df79efde | 411 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 | 412 | |
d039c688 | 413 | rsp = regs->rsp; |
1da177e4 LT |
414 | printk("CPU %d ", cpu); |
415 | __show_regs(regs); | |
416 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 417 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
418 | |
419 | /* | |
420 | * When in-kernel, we also print out the stack and code at the | |
421 | * time of the fault.. | |
422 | */ | |
423 | if (in_kernel) { | |
1da177e4 | 424 | printk("Stack: "); |
b538ed27 | 425 | _show_stack(NULL, regs, (unsigned long*)rsp); |
1da177e4 LT |
426 | |
427 | printk("\nCode: "); | |
2b692a87 | 428 | if (regs->rip < PAGE_OFFSET) |
1da177e4 LT |
429 | goto bad; |
430 | ||
2b692a87 | 431 | for (i=0; i<20; i++) { |
1da177e4 | 432 | unsigned char c; |
2b692a87 | 433 | if (__get_user(c, &((unsigned char*)regs->rip)[i])) { |
1da177e4 LT |
434 | bad: |
435 | printk(" Bad RIP value."); | |
436 | break; | |
437 | } | |
438 | printk("%02x ", c); | |
439 | } | |
440 | } | |
441 | printk("\n"); | |
442 | } | |
443 | ||
c31a0bf3 JF |
444 | int is_valid_bugaddr(unsigned long rip) |
445 | { | |
446 | unsigned short ud2; | |
447 | ||
448 | if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2))) | |
449 | return 0; | |
450 | ||
451 | return ud2 == 0x0b0f; | |
452 | } | |
1da177e4 | 453 | |
4f60fdf6 | 454 | #ifdef CONFIG_BUG |
1da177e4 LT |
455 | void out_of_line_bug(void) |
456 | { | |
457 | BUG(); | |
458 | } | |
2ee60e17 | 459 | EXPORT_SYMBOL(out_of_line_bug); |
4f60fdf6 | 460 | #endif |
1da177e4 LT |
461 | |
462 | static DEFINE_SPINLOCK(die_lock); | |
463 | static int die_owner = -1; | |
cdc60a4c | 464 | static unsigned int die_nest_count; |
1da177e4 | 465 | |
eddb6fb9 | 466 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 467 | { |
151f8cc1 | 468 | int cpu = smp_processor_id(); |
1209140c JB |
469 | unsigned long flags; |
470 | ||
abf0f109 AM |
471 | oops_enter(); |
472 | ||
1209140c JB |
473 | /* racy, but better than risking deadlock. */ |
474 | local_irq_save(flags); | |
1da177e4 LT |
475 | if (!spin_trylock(&die_lock)) { |
476 | if (cpu == die_owner) | |
477 | /* nested oops. should stop eventually */; | |
478 | else | |
1209140c | 479 | spin_lock(&die_lock); |
1da177e4 | 480 | } |
cdc60a4c | 481 | die_nest_count++; |
1209140c | 482 | die_owner = cpu; |
1da177e4 | 483 | console_verbose(); |
1209140c JB |
484 | bust_spinlocks(1); |
485 | return flags; | |
1da177e4 LT |
486 | } |
487 | ||
eddb6fb9 | 488 | void __kprobes oops_end(unsigned long flags) |
1da177e4 LT |
489 | { |
490 | die_owner = -1; | |
1209140c | 491 | bust_spinlocks(0); |
cdc60a4c CM |
492 | die_nest_count--; |
493 | if (die_nest_count) | |
494 | /* We still own the lock */ | |
495 | local_irq_restore(flags); | |
496 | else | |
497 | /* Nest count reaches zero, release the lock. */ | |
498 | spin_unlock_irqrestore(&die_lock, flags); | |
1da177e4 | 499 | if (panic_on_oops) |
012c437d | 500 | panic("Fatal exception"); |
abf0f109 | 501 | oops_exit(); |
1209140c | 502 | } |
1da177e4 | 503 | |
eddb6fb9 | 504 | void __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
505 | { |
506 | static int die_counter; | |
507 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
508 | #ifdef CONFIG_PREEMPT | |
509 | printk("PREEMPT "); | |
510 | #endif | |
511 | #ifdef CONFIG_SMP | |
512 | printk("SMP "); | |
513 | #endif | |
514 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
515 | printk("DEBUG_PAGEALLOC"); | |
516 | #endif | |
517 | printk("\n"); | |
6e3f3617 | 518 | notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); |
1da177e4 LT |
519 | show_registers(regs); |
520 | /* Executive summary in case the oops scrolled away */ | |
521 | printk(KERN_ALERT "RIP "); | |
522 | printk_address(regs->rip); | |
523 | printk(" RSP <%016lx>\n", regs->rsp); | |
8bcc5280 VG |
524 | if (kexec_should_crash(current)) |
525 | crash_kexec(regs); | |
1da177e4 LT |
526 | } |
527 | ||
528 | void die(const char * str, struct pt_regs * regs, long err) | |
529 | { | |
1209140c JB |
530 | unsigned long flags = oops_begin(); |
531 | ||
c31a0bf3 JF |
532 | if (!user_mode(regs)) |
533 | report_bug(regs->rip); | |
534 | ||
1da177e4 | 535 | __die(str, regs, err); |
1209140c | 536 | oops_end(flags); |
1da177e4 LT |
537 | do_exit(SIGSEGV); |
538 | } | |
1da177e4 | 539 | |
fac58550 | 540 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 541 | { |
1209140c JB |
542 | unsigned long flags = oops_begin(); |
543 | ||
1da177e4 LT |
544 | /* |
545 | * We are in trouble anyway, lets at least try | |
546 | * to get a message out. | |
547 | */ | |
151f8cc1 | 548 | printk(str, smp_processor_id()); |
1da177e4 | 549 | show_registers(regs); |
8bcc5280 VG |
550 | if (kexec_should_crash(current)) |
551 | crash_kexec(regs); | |
fac58550 AK |
552 | if (do_panic || panic_on_oops) |
553 | panic("Non maskable interrupt"); | |
1209140c | 554 | oops_end(flags); |
8b1ffe95 CM |
555 | nmi_exit(); |
556 | local_irq_enable(); | |
1da177e4 LT |
557 | do_exit(SIGSEGV); |
558 | } | |
559 | ||
0f2fbdcb PP |
560 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
561 | struct pt_regs * regs, long error_code, | |
562 | siginfo_t *info) | |
1da177e4 | 563 | { |
6e3f3617 JB |
564 | struct task_struct *tsk = current; |
565 | ||
6e3f3617 | 566 | if (user_mode(regs)) { |
d1895183 AK |
567 | /* |
568 | * We want error_code and trap_no set for userspace | |
569 | * faults and kernelspace faults which result in | |
570 | * die(), but not kernelspace faults which are fixed | |
571 | * up. die() gives the process no chance to handle | |
572 | * the signal and notice the kernel fault information, | |
573 | * so that won't result in polluting the information | |
574 | * about previously queued, but not yet delivered, | |
575 | * faults. See also do_general_protection below. | |
576 | */ | |
577 | tsk->thread.error_code = error_code; | |
578 | tsk->thread.trap_no = trapnr; | |
579 | ||
1da177e4 LT |
580 | if (exception_trace && unhandled_signal(tsk, signr)) |
581 | printk(KERN_INFO | |
582 | "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n", | |
583 | tsk->comm, tsk->pid, str, | |
2b692a87 | 584 | regs->rip, regs->rsp, error_code); |
1da177e4 | 585 | |
1da177e4 LT |
586 | if (info) |
587 | force_sig_info(signr, info, tsk); | |
588 | else | |
589 | force_sig(signr, tsk); | |
590 | return; | |
591 | } | |
592 | ||
593 | ||
594 | /* kernel trap */ | |
595 | { | |
596 | const struct exception_table_entry *fixup; | |
597 | fixup = search_exception_tables(regs->rip); | |
2b692a87 | 598 | if (fixup) |
1da177e4 | 599 | regs->rip = fixup->fixup; |
d1895183 AK |
600 | else { |
601 | tsk->thread.error_code = error_code; | |
602 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 603 | die(str, regs, error_code); |
d1895183 | 604 | } |
1da177e4 LT |
605 | return; |
606 | } | |
607 | } | |
608 | ||
609 | #define DO_ERROR(trapnr, signr, str, name) \ | |
610 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
611 | { \ | |
612 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
613 | == NOTIFY_STOP) \ | |
614 | return; \ | |
40e59a61 | 615 | conditional_sti(regs); \ |
1da177e4 LT |
616 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
617 | } | |
618 | ||
619 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
620 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
621 | { \ | |
622 | siginfo_t info; \ | |
623 | info.si_signo = signr; \ | |
624 | info.si_errno = 0; \ | |
625 | info.si_code = sicode; \ | |
626 | info.si_addr = (void __user *)siaddr; \ | |
627 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
628 | == NOTIFY_STOP) \ | |
629 | return; \ | |
40e59a61 | 630 | conditional_sti(regs); \ |
1da177e4 LT |
631 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
632 | } | |
633 | ||
634 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip) | |
635 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) | |
636 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
100c0e36 | 637 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip) |
1da177e4 LT |
638 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
639 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
640 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
641 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
642 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
643 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
644 | |
645 | /* Runs on IST stack */ | |
646 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
647 | { | |
648 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
649 | 12, SIGBUS) == NOTIFY_STOP) | |
650 | return; | |
651 | preempt_conditional_sti(regs); | |
652 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
653 | preempt_conditional_cli(regs); | |
654 | } | |
eca37c18 JB |
655 | |
656 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
657 | { | |
658 | static const char str[] = "double fault"; | |
659 | struct task_struct *tsk = current; | |
660 | ||
661 | /* Return not checked because double check cannot be ignored */ | |
662 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
663 | ||
664 | tsk->thread.error_code = error_code; | |
665 | tsk->thread.trap_no = 8; | |
666 | ||
667 | /* This is always a kernel trap and never fixable (and thus must | |
668 | never return). */ | |
669 | for (;;) | |
670 | die(str, regs, error_code); | |
671 | } | |
1da177e4 | 672 | |
0f2fbdcb PP |
673 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
674 | long error_code) | |
1da177e4 | 675 | { |
6e3f3617 JB |
676 | struct task_struct *tsk = current; |
677 | ||
1da177e4 LT |
678 | conditional_sti(regs); |
679 | ||
6e3f3617 | 680 | if (user_mode(regs)) { |
d1895183 AK |
681 | tsk->thread.error_code = error_code; |
682 | tsk->thread.trap_no = 13; | |
683 | ||
1da177e4 LT |
684 | if (exception_trace && unhandled_signal(tsk, SIGSEGV)) |
685 | printk(KERN_INFO | |
686 | "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n", | |
687 | tsk->comm, tsk->pid, | |
2b692a87 | 688 | regs->rip, regs->rsp, error_code); |
1da177e4 | 689 | |
1da177e4 LT |
690 | force_sig(SIGSEGV, tsk); |
691 | return; | |
692 | } | |
693 | ||
694 | /* kernel gp */ | |
695 | { | |
696 | const struct exception_table_entry *fixup; | |
697 | fixup = search_exception_tables(regs->rip); | |
698 | if (fixup) { | |
699 | regs->rip = fixup->fixup; | |
700 | return; | |
701 | } | |
d1895183 AK |
702 | |
703 | tsk->thread.error_code = error_code; | |
704 | tsk->thread.trap_no = 13; | |
1da177e4 LT |
705 | if (notify_die(DIE_GPF, "general protection fault", regs, |
706 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
707 | return; | |
708 | die("general protection fault", regs, error_code); | |
709 | } | |
710 | } | |
711 | ||
eddb6fb9 AK |
712 | static __kprobes void |
713 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 714 | { |
c41c5cd3 DZ |
715 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
716 | reason); | |
9c5f8be4 | 717 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 718 | |
8da5adda | 719 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
720 | panic("NMI: Not continuing"); |
721 | ||
722 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
723 | |
724 | /* Clear and disable the memory parity error line. */ | |
725 | reason = (reason & 0xf) | 4; | |
726 | outb(reason, 0x61); | |
727 | } | |
728 | ||
eddb6fb9 AK |
729 | static __kprobes void |
730 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
731 | { |
732 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
733 | show_registers(regs); | |
734 | ||
735 | /* Re-enable the IOCK line, wait for a few seconds */ | |
736 | reason = (reason & 0xf) | 8; | |
737 | outb(reason, 0x61); | |
738 | mdelay(2000); | |
739 | reason &= ~8; | |
740 | outb(reason, 0x61); | |
741 | } | |
742 | ||
eddb6fb9 AK |
743 | static __kprobes void |
744 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 DZ |
745 | { |
746 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", | |
747 | reason); | |
748 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
749 | |
750 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 751 | panic("NMI: Not continuing"); |
8da5adda | 752 | |
c41c5cd3 | 753 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
754 | } |
755 | ||
6fefb0d1 AK |
756 | /* Runs on IST stack. This code must keep interrupts off all the time. |
757 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 758 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
759 | { |
760 | unsigned char reason = 0; | |
76e4f660 AR |
761 | int cpu; |
762 | ||
763 | cpu = smp_processor_id(); | |
1da177e4 LT |
764 | |
765 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 766 | if (!cpu) |
1da177e4 LT |
767 | reason = get_nmi_reason(); |
768 | ||
769 | if (!(reason & 0xc0)) { | |
6e3f3617 | 770 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
771 | == NOTIFY_STOP) |
772 | return; | |
1da177e4 LT |
773 | /* |
774 | * Ok, so this is none of the documented NMI sources, | |
775 | * so it must be the NMI watchdog. | |
776 | */ | |
3adbbcce | 777 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 778 | return; |
f64da958 CM |
779 | if (notify_die(DIE_NMI_POST, "nmi_post", regs, reason, 2, 0) |
780 | == NOTIFY_STOP) | |
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); |