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Commit | Line | Data |
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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> |
57c351de | 34 | #include <linux/utsname.h> |
1da177e4 | 35 | |
c0d12172 DJ |
36 | #if defined(CONFIG_EDAC) |
37 | #include <linux/edac.h> | |
38 | #endif | |
39 | ||
1da177e4 | 40 | #include <asm/system.h> |
1da177e4 LT |
41 | #include <asm/io.h> |
42 | #include <asm/atomic.h> | |
43 | #include <asm/debugreg.h> | |
44 | #include <asm/desc.h> | |
45 | #include <asm/i387.h> | |
1da177e4 | 46 | #include <asm/processor.h> |
b538ed27 | 47 | #include <asm/unwind.h> |
1da177e4 LT |
48 | #include <asm/smp.h> |
49 | #include <asm/pgalloc.h> | |
50 | #include <asm/pda.h> | |
51 | #include <asm/proto.h> | |
52 | #include <asm/nmi.h> | |
c0b766f1 | 53 | #include <asm/stacktrace.h> |
1da177e4 | 54 | |
1da177e4 LT |
55 | asmlinkage void divide_error(void); |
56 | asmlinkage void debug(void); | |
57 | asmlinkage void nmi(void); | |
58 | asmlinkage void int3(void); | |
59 | asmlinkage void overflow(void); | |
60 | asmlinkage void bounds(void); | |
61 | asmlinkage void invalid_op(void); | |
62 | asmlinkage void device_not_available(void); | |
63 | asmlinkage void double_fault(void); | |
64 | asmlinkage void coprocessor_segment_overrun(void); | |
65 | asmlinkage void invalid_TSS(void); | |
66 | asmlinkage void segment_not_present(void); | |
67 | asmlinkage void stack_segment(void); | |
68 | asmlinkage void general_protection(void); | |
69 | asmlinkage void page_fault(void); | |
70 | asmlinkage void coprocessor_error(void); | |
71 | asmlinkage void simd_coprocessor_error(void); | |
72 | asmlinkage void reserved(void); | |
73 | asmlinkage void alignment_check(void); | |
74 | asmlinkage void machine_check(void); | |
75 | asmlinkage void spurious_interrupt_bug(void); | |
1da177e4 | 76 | |
1da177e4 LT |
77 | static inline void conditional_sti(struct pt_regs *regs) |
78 | { | |
65ea5b03 | 79 | if (regs->flags & X86_EFLAGS_IF) |
1da177e4 LT |
80 | local_irq_enable(); |
81 | } | |
82 | ||
a65d17c9 JB |
83 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
84 | { | |
85 | preempt_disable(); | |
65ea5b03 | 86 | if (regs->flags & X86_EFLAGS_IF) |
a65d17c9 JB |
87 | local_irq_enable(); |
88 | } | |
89 | ||
90 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
91 | { | |
65ea5b03 | 92 | if (regs->flags & X86_EFLAGS_IF) |
a65d17c9 | 93 | local_irq_disable(); |
40e59a61 AK |
94 | /* Make sure to not schedule here because we could be running |
95 | on an exception stack. */ | |
a65d17c9 JB |
96 | preempt_enable_no_resched(); |
97 | } | |
98 | ||
0741f4d2 | 99 | int kstack_depth_to_print = 12; |
1da177e4 LT |
100 | |
101 | #ifdef CONFIG_KALLSYMS | |
3ac94932 IM |
102 | void printk_address(unsigned long address) |
103 | { | |
1da177e4 LT |
104 | unsigned long offset = 0, symsize; |
105 | const char *symname; | |
106 | char *modname; | |
3ac94932 | 107 | char *delim = ":"; |
1da177e4 LT |
108 | char namebuf[128]; |
109 | ||
3ac94932 IM |
110 | symname = kallsyms_lookup(address, &symsize, &offset, |
111 | &modname, namebuf); | |
112 | if (!symname) { | |
113 | printk(" [<%016lx>]\n", address); | |
114 | return; | |
115 | } | |
116 | if (!modname) | |
1da177e4 | 117 | modname = delim = ""; |
3ac94932 IM |
118 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
119 | address, delim, modname, delim, symname, offset, symsize); | |
120 | } | |
1da177e4 | 121 | #else |
3ac94932 IM |
122 | void printk_address(unsigned long address) |
123 | { | |
124 | printk(" [<%016lx>]\n", address); | |
125 | } | |
1da177e4 LT |
126 | #endif |
127 | ||
0a658002 | 128 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 129 | unsigned *usedp, char **idp) |
0a658002 | 130 | { |
b556b35e | 131 | static char ids[][8] = { |
0a658002 AK |
132 | [DEBUG_STACK - 1] = "#DB", |
133 | [NMI_STACK - 1] = "NMI", | |
134 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
135 | [STACKFAULT_STACK - 1] = "#SS", | |
136 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
137 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
138 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
139 | #endif | |
0a658002 AK |
140 | }; |
141 | unsigned k; | |
1da177e4 | 142 | |
c9ca1ba5 IM |
143 | /* |
144 | * Iterate over all exception stacks, and figure out whether | |
145 | * 'stack' is in one of them: | |
146 | */ | |
0a658002 | 147 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 148 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
149 | /* |
150 | * Is 'stack' above this exception frame's end? | |
151 | * If yes then skip to the next frame. | |
152 | */ | |
0a658002 AK |
153 | if (stack >= end) |
154 | continue; | |
c9ca1ba5 IM |
155 | /* |
156 | * Is 'stack' above this exception frame's start address? | |
157 | * If yes then we found the right frame. | |
158 | */ | |
0a658002 | 159 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
160 | /* |
161 | * Make sure we only iterate through an exception | |
162 | * stack once. If it comes up for the second time | |
163 | * then there's something wrong going on - just | |
164 | * break out and return NULL: | |
165 | */ | |
0a658002 AK |
166 | if (*usedp & (1U << k)) |
167 | break; | |
168 | *usedp |= 1U << k; | |
169 | *idp = ids[k]; | |
170 | return (unsigned long *)end; | |
171 | } | |
c9ca1ba5 IM |
172 | /* |
173 | * If this is a debug stack, and if it has a larger size than | |
174 | * the usual exception stacks, then 'stack' might still | |
175 | * be within the lower portion of the debug stack: | |
176 | */ | |
b556b35e JB |
177 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
178 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
179 | unsigned j = N_EXCEPTION_STACKS - 1; | |
180 | ||
c9ca1ba5 IM |
181 | /* |
182 | * Black magic. A large debug stack is composed of | |
183 | * multiple exception stack entries, which we | |
184 | * iterate through now. Dont look: | |
185 | */ | |
b556b35e JB |
186 | do { |
187 | ++j; | |
188 | end -= EXCEPTION_STKSZ; | |
189 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
190 | } while (stack < end - EXCEPTION_STKSZ); | |
191 | if (*usedp & (1U << j)) | |
192 | break; | |
193 | *usedp |= 1U << j; | |
194 | *idp = ids[j]; | |
195 | return (unsigned long *)end; | |
196 | } | |
197 | #endif | |
1da177e4 LT |
198 | } |
199 | return NULL; | |
0a658002 | 200 | } |
1da177e4 | 201 | |
b615ebda AK |
202 | #define MSG(txt) ops->warning(data, txt) |
203 | ||
1da177e4 | 204 | /* |
676b1855 | 205 | * x86-64 can have up to three kernel stacks: |
1da177e4 LT |
206 | * process stack |
207 | * interrupt stack | |
0a658002 | 208 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
209 | */ |
210 | ||
c547c77e AK |
211 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
212 | { | |
213 | void *t = (void *)tinfo; | |
214 | return p > t && p < t + THREAD_SIZE - 3; | |
215 | } | |
216 | ||
b615ebda AK |
217 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
218 | unsigned long *stack, | |
9689ba8a | 219 | const struct stacktrace_ops *ops, void *data) |
1da177e4 | 220 | { |
da68933e | 221 | const unsigned cpu = get_cpu(); |
b615ebda | 222 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 223 | unsigned used = 0; |
c547c77e | 224 | struct thread_info *tinfo; |
1da177e4 | 225 | |
b538ed27 JB |
226 | if (!tsk) |
227 | tsk = current; | |
228 | ||
c0b766f1 AK |
229 | if (!stack) { |
230 | unsigned long dummy; | |
231 | stack = &dummy; | |
232 | if (tsk && tsk != current) | |
faca6227 | 233 | stack = (unsigned long *)tsk->thread.sp; |
b538ed27 JB |
234 | } |
235 | ||
c9ca1ba5 IM |
236 | /* |
237 | * Print function call entries within a stack. 'cond' is the | |
238 | * "end of stackframe" condition, that the 'stack++' | |
239 | * iteration will eventually trigger. | |
240 | */ | |
0a658002 AK |
241 | #define HANDLE_STACK(cond) \ |
242 | do while (cond) { \ | |
1b2f6304 | 243 | unsigned long addr = *stack++; \ |
446f713b AK |
244 | /* Use unlocked access here because except for NMIs \ |
245 | we should be already protected against module unloads */ \ | |
246 | if (__kernel_text_address(addr)) { \ | |
0a658002 AK |
247 | /* \ |
248 | * If the address is either in the text segment of the \ | |
249 | * kernel, or in the region which contains vmalloc'ed \ | |
250 | * memory, it *may* be the address of a calling \ | |
251 | * routine; if so, print it so that someone tracing \ | |
252 | * down the cause of the crash will be able to figure \ | |
253 | * out the call path that was taken. \ | |
254 | */ \ | |
c0b766f1 | 255 | ops->address(data, addr); \ |
0a658002 AK |
256 | } \ |
257 | } while (0) | |
258 | ||
c9ca1ba5 IM |
259 | /* |
260 | * Print function call entries in all stacks, starting at the | |
261 | * current stack address. If the stacks consist of nested | |
262 | * exceptions | |
263 | */ | |
c0b766f1 AK |
264 | for (;;) { |
265 | char *id; | |
0a658002 AK |
266 | unsigned long *estack_end; |
267 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
268 | &used, &id); | |
269 | ||
270 | if (estack_end) { | |
c0b766f1 AK |
271 | if (ops->stack(data, id) < 0) |
272 | break; | |
0a658002 | 273 | HANDLE_STACK (stack < estack_end); |
c0b766f1 | 274 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
275 | /* |
276 | * We link to the next stack via the | |
277 | * second-to-last pointer (index -2 to end) in the | |
278 | * exception stack: | |
279 | */ | |
0a658002 AK |
280 | stack = (unsigned long *) estack_end[-2]; |
281 | continue; | |
1da177e4 | 282 | } |
0a658002 AK |
283 | if (irqstack_end) { |
284 | unsigned long *irqstack; | |
285 | irqstack = irqstack_end - | |
286 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
287 | ||
288 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
289 | if (ops->stack(data, "IRQ") < 0) |
290 | break; | |
0a658002 | 291 | HANDLE_STACK (stack < irqstack_end); |
c9ca1ba5 IM |
292 | /* |
293 | * We link to the next stack (which would be | |
294 | * the process stack normally) the last | |
295 | * pointer (index -1 to end) in the IRQ stack: | |
296 | */ | |
0a658002 AK |
297 | stack = (unsigned long *) (irqstack_end[-1]); |
298 | irqstack_end = NULL; | |
c0b766f1 | 299 | ops->stack(data, "EOI"); |
0a658002 | 300 | continue; |
1da177e4 | 301 | } |
1da177e4 | 302 | } |
0a658002 | 303 | break; |
1da177e4 | 304 | } |
0a658002 | 305 | |
c9ca1ba5 | 306 | /* |
c0b766f1 | 307 | * This handles the process stack: |
c9ca1ba5 | 308 | */ |
7523c4dd | 309 | tinfo = task_thread_info(tsk); |
c547c77e | 310 | HANDLE_STACK (valid_stack_ptr(tinfo, stack)); |
0a658002 | 311 | #undef HANDLE_STACK |
da68933e | 312 | put_cpu(); |
c0b766f1 AK |
313 | } |
314 | EXPORT_SYMBOL(dump_trace); | |
315 | ||
316 | static void | |
317 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
318 | { | |
319 | print_symbol(msg, symbol); | |
320 | printk("\n"); | |
321 | } | |
322 | ||
323 | static void print_trace_warning(void *data, char *msg) | |
324 | { | |
325 | printk("%s\n", msg); | |
326 | } | |
327 | ||
328 | static int print_trace_stack(void *data, char *name) | |
329 | { | |
330 | printk(" <%s> ", name); | |
331 | return 0; | |
332 | } | |
3ac94932 | 333 | |
c0b766f1 AK |
334 | static void print_trace_address(void *data, unsigned long addr) |
335 | { | |
1c978b93 | 336 | touch_nmi_watchdog(); |
c0b766f1 AK |
337 | printk_address(addr); |
338 | } | |
339 | ||
9689ba8a | 340 | static const struct stacktrace_ops print_trace_ops = { |
c0b766f1 AK |
341 | .warning = print_trace_warning, |
342 | .warning_symbol = print_trace_warning_symbol, | |
343 | .stack = print_trace_stack, | |
344 | .address = print_trace_address, | |
345 | }; | |
346 | ||
347 | void | |
348 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) | |
349 | { | |
350 | printk("\nCall Trace:\n"); | |
351 | dump_trace(tsk, regs, stack, &print_trace_ops, NULL); | |
1da177e4 LT |
352 | printk("\n"); |
353 | } | |
354 | ||
c0b766f1 | 355 | static void |
65ea5b03 | 356 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *sp) |
1da177e4 LT |
357 | { |
358 | unsigned long *stack; | |
359 | int i; | |
151f8cc1 | 360 | const int cpu = smp_processor_id(); |
df79efde RT |
361 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
362 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
363 | |
364 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
365 | // back trace for this cpu. | |
366 | ||
65ea5b03 | 367 | if (sp == NULL) { |
1da177e4 | 368 | if (tsk) |
faca6227 | 369 | sp = (unsigned long *)tsk->thread.sp; |
1da177e4 | 370 | else |
65ea5b03 | 371 | sp = (unsigned long *)&sp; |
1da177e4 LT |
372 | } |
373 | ||
65ea5b03 | 374 | stack = sp; |
1da177e4 LT |
375 | for(i=0; i < kstack_depth_to_print; i++) { |
376 | if (stack >= irqstack && stack <= irqstack_end) { | |
377 | if (stack == irqstack_end) { | |
378 | stack = (unsigned long *) (irqstack_end[-1]); | |
379 | printk(" <EOI> "); | |
380 | } | |
381 | } else { | |
382 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
383 | break; | |
384 | } | |
385 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
386 | printk("\n"); |
387 | printk(" %016lx", *stack++); | |
35faa714 | 388 | touch_nmi_watchdog(); |
1da177e4 | 389 | } |
65ea5b03 | 390 | show_trace(tsk, regs, sp); |
b538ed27 JB |
391 | } |
392 | ||
65ea5b03 | 393 | void show_stack(struct task_struct *tsk, unsigned long * sp) |
b538ed27 | 394 | { |
65ea5b03 | 395 | _show_stack(tsk, NULL, sp); |
1da177e4 LT |
396 | } |
397 | ||
398 | /* | |
399 | * The architecture-independent dump_stack generator | |
400 | */ | |
401 | void dump_stack(void) | |
402 | { | |
403 | unsigned long dummy; | |
57c351de AV |
404 | |
405 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", | |
406 | current->pid, current->comm, print_tainted(), | |
407 | init_utsname()->release, | |
408 | (int)strcspn(init_utsname()->version, " "), | |
409 | init_utsname()->version); | |
b538ed27 | 410 | show_trace(NULL, NULL, &dummy); |
1da177e4 LT |
411 | } |
412 | ||
413 | EXPORT_SYMBOL(dump_stack); | |
414 | ||
415 | void show_registers(struct pt_regs *regs) | |
416 | { | |
417 | int i; | |
76381fee | 418 | int in_kernel = !user_mode(regs); |
65ea5b03 | 419 | unsigned long sp; |
151f8cc1 | 420 | const int cpu = smp_processor_id(); |
df79efde | 421 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 | 422 | |
65ea5b03 | 423 | sp = regs->sp; |
1da177e4 LT |
424 | printk("CPU %d ", cpu); |
425 | __show_regs(regs); | |
426 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 427 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
428 | |
429 | /* | |
430 | * When in-kernel, we also print out the stack and code at the | |
431 | * time of the fault.. | |
432 | */ | |
433 | if (in_kernel) { | |
1da177e4 | 434 | printk("Stack: "); |
65ea5b03 | 435 | _show_stack(NULL, regs, (unsigned long*)sp); |
1da177e4 LT |
436 | |
437 | printk("\nCode: "); | |
65ea5b03 | 438 | if (regs->ip < PAGE_OFFSET) |
1da177e4 LT |
439 | goto bad; |
440 | ||
2b692a87 | 441 | for (i=0; i<20; i++) { |
1da177e4 | 442 | unsigned char c; |
65ea5b03 | 443 | if (__get_user(c, &((unsigned char*)regs->ip)[i])) { |
1da177e4 LT |
444 | bad: |
445 | printk(" Bad RIP value."); | |
446 | break; | |
447 | } | |
448 | printk("%02x ", c); | |
449 | } | |
450 | } | |
451 | printk("\n"); | |
452 | } | |
453 | ||
65ea5b03 | 454 | int is_valid_bugaddr(unsigned long ip) |
c31a0bf3 JF |
455 | { |
456 | unsigned short ud2; | |
457 | ||
65ea5b03 | 458 | if (__copy_from_user(&ud2, (const void __user *) ip, sizeof(ud2))) |
c31a0bf3 JF |
459 | return 0; |
460 | ||
461 | return ud2 == 0x0b0f; | |
462 | } | |
1da177e4 | 463 | |
39743c9e | 464 | static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; |
1da177e4 | 465 | static int die_owner = -1; |
cdc60a4c | 466 | static unsigned int die_nest_count; |
1da177e4 | 467 | |
eddb6fb9 | 468 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 469 | { |
b39b7036 | 470 | int cpu; |
1209140c JB |
471 | unsigned long flags; |
472 | ||
abf0f109 AM |
473 | oops_enter(); |
474 | ||
1209140c | 475 | /* racy, but better than risking deadlock. */ |
39743c9e | 476 | raw_local_irq_save(flags); |
b39b7036 | 477 | cpu = smp_processor_id(); |
39743c9e | 478 | if (!__raw_spin_trylock(&die_lock)) { |
1da177e4 LT |
479 | if (cpu == die_owner) |
480 | /* nested oops. should stop eventually */; | |
481 | else | |
39743c9e | 482 | __raw_spin_lock(&die_lock); |
1da177e4 | 483 | } |
cdc60a4c | 484 | die_nest_count++; |
1209140c | 485 | die_owner = cpu; |
1da177e4 | 486 | console_verbose(); |
1209140c JB |
487 | bust_spinlocks(1); |
488 | return flags; | |
1da177e4 LT |
489 | } |
490 | ||
22f5991c | 491 | void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr) |
1da177e4 LT |
492 | { |
493 | die_owner = -1; | |
1209140c | 494 | bust_spinlocks(0); |
cdc60a4c | 495 | die_nest_count--; |
39743c9e | 496 | if (!die_nest_count) |
cdc60a4c | 497 | /* Nest count reaches zero, release the lock. */ |
39743c9e AK |
498 | __raw_spin_unlock(&die_lock); |
499 | raw_local_irq_restore(flags); | |
22f5991c JB |
500 | if (!regs) { |
501 | oops_exit(); | |
502 | return; | |
503 | } | |
1da177e4 | 504 | if (panic_on_oops) |
012c437d | 505 | panic("Fatal exception"); |
abf0f109 | 506 | oops_exit(); |
22f5991c | 507 | do_exit(signr); |
1209140c | 508 | } |
1da177e4 | 509 | |
22f5991c | 510 | int __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"); | |
22f5991c JB |
524 | if (notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP) |
525 | return 1; | |
1da177e4 | 526 | show_registers(regs); |
bcdcd8e7 | 527 | add_taint(TAINT_DIE); |
1da177e4 LT |
528 | /* Executive summary in case the oops scrolled away */ |
529 | printk(KERN_ALERT "RIP "); | |
65ea5b03 PA |
530 | printk_address(regs->ip); |
531 | printk(" RSP <%016lx>\n", regs->sp); | |
8bcc5280 VG |
532 | if (kexec_should_crash(current)) |
533 | crash_kexec(regs); | |
22f5991c | 534 | return 0; |
1da177e4 LT |
535 | } |
536 | ||
537 | void die(const char * str, struct pt_regs * regs, long err) | |
538 | { | |
1209140c JB |
539 | unsigned long flags = oops_begin(); |
540 | ||
c31a0bf3 | 541 | if (!user_mode(regs)) |
65ea5b03 | 542 | report_bug(regs->ip, regs); |
c31a0bf3 | 543 | |
22f5991c JB |
544 | if (__die(str, regs, err)) |
545 | regs = NULL; | |
546 | oops_end(flags, regs, SIGSEGV); | |
1da177e4 | 547 | } |
1da177e4 | 548 | |
fac58550 | 549 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 550 | { |
1209140c JB |
551 | unsigned long flags = oops_begin(); |
552 | ||
1da177e4 LT |
553 | /* |
554 | * We are in trouble anyway, lets at least try | |
555 | * to get a message out. | |
556 | */ | |
151f8cc1 | 557 | printk(str, smp_processor_id()); |
1da177e4 | 558 | show_registers(regs); |
8bcc5280 VG |
559 | if (kexec_should_crash(current)) |
560 | crash_kexec(regs); | |
fac58550 AK |
561 | if (do_panic || panic_on_oops) |
562 | panic("Non maskable interrupt"); | |
22f5991c | 563 | oops_end(flags, NULL, SIGBUS); |
8b1ffe95 CM |
564 | nmi_exit(); |
565 | local_irq_enable(); | |
22f5991c | 566 | do_exit(SIGBUS); |
1da177e4 LT |
567 | } |
568 | ||
0f2fbdcb PP |
569 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
570 | struct pt_regs * regs, long error_code, | |
571 | siginfo_t *info) | |
1da177e4 | 572 | { |
6e3f3617 JB |
573 | struct task_struct *tsk = current; |
574 | ||
6e3f3617 | 575 | if (user_mode(regs)) { |
d1895183 AK |
576 | /* |
577 | * We want error_code and trap_no set for userspace | |
578 | * faults and kernelspace faults which result in | |
579 | * die(), but not kernelspace faults which are fixed | |
580 | * up. die() gives the process no chance to handle | |
581 | * the signal and notice the kernel fault information, | |
582 | * so that won't result in polluting the information | |
583 | * about previously queued, but not yet delivered, | |
584 | * faults. See also do_general_protection below. | |
585 | */ | |
586 | tsk->thread.error_code = error_code; | |
587 | tsk->thread.trap_no = trapnr; | |
588 | ||
abd4f750 MAS |
589 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
590 | printk_ratelimit()) | |
1da177e4 | 591 | printk(KERN_INFO |
65ea5b03 | 592 | "%s[%d] trap %s ip:%lx sp:%lx error:%lx\n", |
1da177e4 | 593 | tsk->comm, tsk->pid, str, |
65ea5b03 | 594 | regs->ip, regs->sp, error_code); |
1da177e4 | 595 | |
1da177e4 LT |
596 | if (info) |
597 | force_sig_info(signr, info, tsk); | |
598 | else | |
599 | force_sig(signr, tsk); | |
600 | return; | |
601 | } | |
602 | ||
603 | ||
604 | /* kernel trap */ | |
605 | { | |
606 | const struct exception_table_entry *fixup; | |
65ea5b03 | 607 | fixup = search_exception_tables(regs->ip); |
2b692a87 | 608 | if (fixup) |
65ea5b03 | 609 | regs->ip = fixup->fixup; |
d1895183 AK |
610 | else { |
611 | tsk->thread.error_code = error_code; | |
612 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 613 | die(str, regs, error_code); |
d1895183 | 614 | } |
1da177e4 LT |
615 | return; |
616 | } | |
617 | } | |
618 | ||
619 | #define DO_ERROR(trapnr, signr, str, name) \ | |
620 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
621 | { \ | |
622 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
623 | == NOTIFY_STOP) \ | |
624 | return; \ | |
40e59a61 | 625 | conditional_sti(regs); \ |
1da177e4 LT |
626 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
627 | } | |
628 | ||
629 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
630 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
631 | { \ | |
632 | siginfo_t info; \ | |
633 | info.si_signo = signr; \ | |
634 | info.si_errno = 0; \ | |
635 | info.si_code = sicode; \ | |
636 | info.si_addr = (void __user *)siaddr; \ | |
fb1dac90 | 637 | trace_hardirqs_fixup(); \ |
1da177e4 LT |
638 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
639 | == NOTIFY_STOP) \ | |
640 | return; \ | |
40e59a61 | 641 | conditional_sti(regs); \ |
1da177e4 LT |
642 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
643 | } | |
644 | ||
65ea5b03 | 645 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
1da177e4 LT |
646 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) |
647 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
65ea5b03 | 648 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip) |
1da177e4 LT |
649 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
650 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
651 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
652 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
653 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
654 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
655 | |
656 | /* Runs on IST stack */ | |
657 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
658 | { | |
659 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
660 | 12, SIGBUS) == NOTIFY_STOP) | |
661 | return; | |
662 | preempt_conditional_sti(regs); | |
663 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
664 | preempt_conditional_cli(regs); | |
665 | } | |
eca37c18 JB |
666 | |
667 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
668 | { | |
669 | static const char str[] = "double fault"; | |
670 | struct task_struct *tsk = current; | |
671 | ||
672 | /* Return not checked because double check cannot be ignored */ | |
673 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
674 | ||
675 | tsk->thread.error_code = error_code; | |
676 | tsk->thread.trap_no = 8; | |
677 | ||
678 | /* This is always a kernel trap and never fixable (and thus must | |
679 | never return). */ | |
680 | for (;;) | |
681 | die(str, regs, error_code); | |
682 | } | |
1da177e4 | 683 | |
0f2fbdcb PP |
684 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
685 | long error_code) | |
1da177e4 | 686 | { |
6e3f3617 JB |
687 | struct task_struct *tsk = current; |
688 | ||
1da177e4 LT |
689 | conditional_sti(regs); |
690 | ||
6e3f3617 | 691 | if (user_mode(regs)) { |
d1895183 AK |
692 | tsk->thread.error_code = error_code; |
693 | tsk->thread.trap_no = 13; | |
694 | ||
abd4f750 MAS |
695 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
696 | printk_ratelimit()) | |
1da177e4 | 697 | printk(KERN_INFO |
65ea5b03 | 698 | "%s[%d] general protection ip:%lx sp:%lx error:%lx\n", |
1da177e4 | 699 | tsk->comm, tsk->pid, |
65ea5b03 | 700 | regs->ip, regs->sp, error_code); |
1da177e4 | 701 | |
1da177e4 LT |
702 | force_sig(SIGSEGV, tsk); |
703 | return; | |
704 | } | |
705 | ||
706 | /* kernel gp */ | |
707 | { | |
708 | const struct exception_table_entry *fixup; | |
65ea5b03 | 709 | fixup = search_exception_tables(regs->ip); |
1da177e4 | 710 | if (fixup) { |
65ea5b03 | 711 | regs->ip = fixup->fixup; |
1da177e4 LT |
712 | return; |
713 | } | |
d1895183 AK |
714 | |
715 | tsk->thread.error_code = error_code; | |
716 | tsk->thread.trap_no = 13; | |
1da177e4 LT |
717 | if (notify_die(DIE_GPF, "general protection fault", regs, |
718 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
719 | return; | |
720 | die("general protection fault", regs, error_code); | |
721 | } | |
722 | } | |
723 | ||
eddb6fb9 AK |
724 | static __kprobes void |
725 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 726 | { |
c41c5cd3 DZ |
727 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
728 | reason); | |
9c5f8be4 | 729 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 730 | |
c0d12172 DJ |
731 | #if defined(CONFIG_EDAC) |
732 | if(edac_handler_set()) { | |
733 | edac_atomic_assert_error(); | |
734 | return; | |
735 | } | |
736 | #endif | |
737 | ||
8da5adda | 738 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
739 | panic("NMI: Not continuing"); |
740 | ||
741 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
742 | |
743 | /* Clear and disable the memory parity error line. */ | |
744 | reason = (reason & 0xf) | 4; | |
745 | outb(reason, 0x61); | |
746 | } | |
747 | ||
eddb6fb9 AK |
748 | static __kprobes void |
749 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
750 | { |
751 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
752 | show_registers(regs); | |
753 | ||
754 | /* Re-enable the IOCK line, wait for a few seconds */ | |
755 | reason = (reason & 0xf) | 8; | |
756 | outb(reason, 0x61); | |
757 | mdelay(2000); | |
758 | reason &= ~8; | |
759 | outb(reason, 0x61); | |
760 | } | |
761 | ||
eddb6fb9 AK |
762 | static __kprobes void |
763 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 DZ |
764 | { |
765 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", | |
766 | reason); | |
767 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
768 | |
769 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 770 | panic("NMI: Not continuing"); |
8da5adda | 771 | |
c41c5cd3 | 772 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
773 | } |
774 | ||
6fefb0d1 AK |
775 | /* Runs on IST stack. This code must keep interrupts off all the time. |
776 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 777 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
778 | { |
779 | unsigned char reason = 0; | |
76e4f660 AR |
780 | int cpu; |
781 | ||
782 | cpu = smp_processor_id(); | |
1da177e4 LT |
783 | |
784 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 785 | if (!cpu) |
1da177e4 LT |
786 | reason = get_nmi_reason(); |
787 | ||
788 | if (!(reason & 0xc0)) { | |
6e3f3617 | 789 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
790 | == NOTIFY_STOP) |
791 | return; | |
1da177e4 LT |
792 | /* |
793 | * Ok, so this is none of the documented NMI sources, | |
794 | * so it must be the NMI watchdog. | |
795 | */ | |
3adbbcce | 796 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 797 | return; |
3adbbcce | 798 | if (!do_nmi_callback(regs,cpu)) |
3adbbcce DZ |
799 | unknown_nmi_error(reason, regs); |
800 | ||
1da177e4 LT |
801 | return; |
802 | } | |
6e3f3617 | 803 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
804 | return; |
805 | ||
806 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
807 | ||
808 | if (reason & 0x80) | |
809 | mem_parity_error(reason, regs); | |
810 | if (reason & 0x40) | |
811 | io_check_error(reason, regs); | |
812 | } | |
813 | ||
b556b35e | 814 | /* runs on IST stack. */ |
0f2fbdcb | 815 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 | 816 | { |
143a5d32 PZ |
817 | trace_hardirqs_fixup(); |
818 | ||
1da177e4 LT |
819 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { |
820 | return; | |
821 | } | |
40e59a61 | 822 | preempt_conditional_sti(regs); |
1da177e4 | 823 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 824 | preempt_conditional_cli(regs); |
1da177e4 LT |
825 | } |
826 | ||
6fefb0d1 AK |
827 | /* Help handler running on IST stack to switch back to user stack |
828 | for scheduling or signal handling. The actual stack switch is done in | |
829 | entry.S */ | |
eddb6fb9 | 830 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
831 | { |
832 | struct pt_regs *regs = eregs; | |
833 | /* Did already sync */ | |
65ea5b03 | 834 | if (eregs == (struct pt_regs *)eregs->sp) |
6fefb0d1 AK |
835 | ; |
836 | /* Exception from user space */ | |
76381fee | 837 | else if (user_mode(eregs)) |
bb049232 | 838 | regs = task_pt_regs(current); |
6fefb0d1 AK |
839 | /* Exception from kernel and interrupts are enabled. Move to |
840 | kernel process stack. */ | |
65ea5b03 PA |
841 | else if (eregs->flags & X86_EFLAGS_IF) |
842 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); | |
6fefb0d1 AK |
843 | if (eregs != regs) |
844 | *regs = *eregs; | |
845 | return regs; | |
846 | } | |
847 | ||
1da177e4 | 848 | /* runs on IST stack. */ |
0f2fbdcb PP |
849 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
850 | unsigned long error_code) | |
1da177e4 | 851 | { |
1da177e4 LT |
852 | unsigned long condition; |
853 | struct task_struct *tsk = current; | |
854 | siginfo_t info; | |
855 | ||
000f4a9e PZ |
856 | trace_hardirqs_fixup(); |
857 | ||
e9129e56 | 858 | get_debugreg(condition, 6); |
1da177e4 | 859 | |
10faa81e RM |
860 | /* |
861 | * The processor cleared BTF, so don't mark that we need it set. | |
862 | */ | |
863 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); | |
864 | tsk->thread.debugctlmsr = 0; | |
865 | ||
1da177e4 | 866 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
daeeafec | 867 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 868 | return; |
daeeafec | 869 | |
a65d17c9 | 870 | preempt_conditional_sti(regs); |
1da177e4 LT |
871 | |
872 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
873 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
874 | if (!tsk->thread.debugreg7) { | |
875 | goto clear_dr7; | |
876 | } | |
877 | } | |
878 | ||
879 | tsk->thread.debugreg6 = condition; | |
880 | ||
e1f28773 RM |
881 | |
882 | /* | |
883 | * Single-stepping through TF: make sure we ignore any events in | |
884 | * kernel space (but re-enable TF when returning to user mode). | |
885 | */ | |
daeeafec | 886 | if (condition & DR_STEP) { |
76381fee | 887 | if (!user_mode(regs)) |
1da177e4 | 888 | goto clear_TF_reenable; |
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; | |
65ea5b03 | 897 | info.si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL; |
01b8faae | 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); | |
053de044 | 907 | regs->flags &= ~X86_EFLAGS_TF; |
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; | |
65ea5b03 | 914 | fixup = search_exception_tables(regs->ip); |
1da177e4 | 915 | if (fixup) { |
65ea5b03 | 916 | regs->ip = fixup->fixup; |
1da177e4 LT |
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 | { | |
65ea5b03 | 933 | void __user *ip = (void __user *)(regs->ip); |
1da177e4 LT |
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; | |
65ea5b03 | 953 | info.si_addr = ip; |
1da177e4 LT |
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 | { | |
65ea5b03 | 1002 | void __user *ip = (void __user *)(regs->ip); |
1da177e4 LT |
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; | |
65ea5b03 | 1022 | info.si_addr = ip; |
1da177e4 LT |
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 | 1083 | } |
21db5584 | 1084 | EXPORT_SYMBOL_GPL(math_state_restore); |
1da177e4 | 1085 | |
1da177e4 LT |
1086 | void __init trap_init(void) |
1087 | { | |
1088 | set_intr_gate(0,÷_error); | |
1089 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1090 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1091 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1092 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1093 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1094 | set_intr_gate(6,&invalid_op); |
1095 | set_intr_gate(7,&device_not_available); | |
1096 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1097 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1098 | set_intr_gate(10,&invalid_TSS); | |
1099 | set_intr_gate(11,&segment_not_present); | |
1100 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1101 | set_intr_gate(13,&general_protection); | |
1102 | set_intr_gate(14,&page_fault); | |
1103 | set_intr_gate(15,&spurious_interrupt_bug); | |
1104 | set_intr_gate(16,&coprocessor_error); | |
1105 | set_intr_gate(17,&alignment_check); | |
1106 | #ifdef CONFIG_X86_MCE | |
1107 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1108 | #endif | |
1109 | set_intr_gate(19,&simd_coprocessor_error); | |
1110 | ||
1111 | #ifdef CONFIG_IA32_EMULATION | |
1112 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1113 | #endif | |
1114 | ||
1da177e4 LT |
1115 | /* |
1116 | * Should be a barrier for any external CPU state. | |
1117 | */ | |
1118 | cpu_init(); | |
1119 | } | |
1120 | ||
1121 | ||
2c8c0e6b | 1122 | static int __init oops_setup(char *s) |
1da177e4 | 1123 | { |
2c8c0e6b AK |
1124 | if (!s) |
1125 | return -EINVAL; | |
1126 | if (!strcmp(s, "panic")) | |
1127 | panic_on_oops = 1; | |
1128 | return 0; | |
1da177e4 | 1129 | } |
2c8c0e6b | 1130 | early_param("oops", oops_setup); |
1da177e4 LT |
1131 | |
1132 | static int __init kstack_setup(char *s) | |
1133 | { | |
2c8c0e6b AK |
1134 | if (!s) |
1135 | return -EINVAL; | |
1da177e4 | 1136 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
2c8c0e6b | 1137 | return 0; |
1da177e4 | 1138 | } |
2c8c0e6b | 1139 | early_param("kstack", kstack_setup); |