Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/x86-64/traps.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs | |
6 | * | |
7 | * Pentium III FXSR, SSE support | |
8 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
1da177e4 LT |
9 | */ |
10 | ||
11 | /* | |
12 | * 'Traps.c' handles hardware traps and faults after we have saved some | |
13 | * state in 'entry.S'. | |
14 | */ | |
1da177e4 LT |
15 | #include <linux/sched.h> |
16 | #include <linux/kernel.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/timer.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/interrupt.h> | |
4b0ff1a9 | 26 | #include <linux/kallsyms.h> |
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <linux/moduleparam.h> | |
35faa714 | 29 | #include <linux/nmi.h> |
0f2fbdcb | 30 | #include <linux/kprobes.h> |
8bcc5280 | 31 | #include <linux/kexec.h> |
b538ed27 | 32 | #include <linux/unwind.h> |
ab2bf0c1 | 33 | #include <linux/uaccess.h> |
c31a0bf3 | 34 | #include <linux/bug.h> |
1da177e4 LT |
35 | |
36 | #include <asm/system.h> | |
1da177e4 LT |
37 | #include <asm/io.h> |
38 | #include <asm/atomic.h> | |
39 | #include <asm/debugreg.h> | |
40 | #include <asm/desc.h> | |
41 | #include <asm/i387.h> | |
42 | #include <asm/kdebug.h> | |
43 | #include <asm/processor.h> | |
b538ed27 | 44 | #include <asm/unwind.h> |
1da177e4 LT |
45 | #include <asm/smp.h> |
46 | #include <asm/pgalloc.h> | |
47 | #include <asm/pda.h> | |
48 | #include <asm/proto.h> | |
49 | #include <asm/nmi.h> | |
c0b766f1 | 50 | #include <asm/stacktrace.h> |
1da177e4 | 51 | |
1da177e4 LT |
52 | asmlinkage void divide_error(void); |
53 | asmlinkage void debug(void); | |
54 | asmlinkage void nmi(void); | |
55 | asmlinkage void int3(void); | |
56 | asmlinkage void overflow(void); | |
57 | asmlinkage void bounds(void); | |
58 | asmlinkage void invalid_op(void); | |
59 | asmlinkage void device_not_available(void); | |
60 | asmlinkage void double_fault(void); | |
61 | asmlinkage void coprocessor_segment_overrun(void); | |
62 | asmlinkage void invalid_TSS(void); | |
63 | asmlinkage void segment_not_present(void); | |
64 | asmlinkage void stack_segment(void); | |
65 | asmlinkage void general_protection(void); | |
66 | asmlinkage void page_fault(void); | |
67 | asmlinkage void coprocessor_error(void); | |
68 | asmlinkage void simd_coprocessor_error(void); | |
69 | asmlinkage void reserved(void); | |
70 | asmlinkage void alignment_check(void); | |
71 | asmlinkage void machine_check(void); | |
72 | asmlinkage void spurious_interrupt_bug(void); | |
1da177e4 | 73 | |
e041c683 | 74 | ATOMIC_NOTIFIER_HEAD(die_chain); |
2ee60e17 | 75 | EXPORT_SYMBOL(die_chain); |
1da177e4 LT |
76 | |
77 | int register_die_notifier(struct notifier_block *nb) | |
78 | { | |
8c914cb7 | 79 | vmalloc_sync_all(); |
e041c683 AS |
80 | return atomic_notifier_chain_register(&die_chain, nb); |
81 | } | |
1454aed9 | 82 | EXPORT_SYMBOL(register_die_notifier); /* used modular by kdb */ |
e041c683 AS |
83 | |
84 | int unregister_die_notifier(struct notifier_block *nb) | |
85 | { | |
86 | return atomic_notifier_chain_unregister(&die_chain, nb); | |
1da177e4 | 87 | } |
1454aed9 | 88 | EXPORT_SYMBOL(unregister_die_notifier); /* used modular by kdb */ |
1da177e4 LT |
89 | |
90 | static inline void conditional_sti(struct pt_regs *regs) | |
91 | { | |
92 | if (regs->eflags & X86_EFLAGS_IF) | |
93 | local_irq_enable(); | |
94 | } | |
95 | ||
a65d17c9 JB |
96 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
97 | { | |
98 | preempt_disable(); | |
99 | if (regs->eflags & X86_EFLAGS_IF) | |
100 | local_irq_enable(); | |
101 | } | |
102 | ||
103 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
104 | { | |
105 | if (regs->eflags & X86_EFLAGS_IF) | |
106 | local_irq_disable(); | |
40e59a61 AK |
107 | /* Make sure to not schedule here because we could be running |
108 | on an exception stack. */ | |
a65d17c9 JB |
109 | preempt_enable_no_resched(); |
110 | } | |
111 | ||
0741f4d2 | 112 | int kstack_depth_to_print = 12; |
ea424055 | 113 | #ifdef CONFIG_STACK_UNWIND |
c33bd9aa | 114 | static int call_trace = 1; |
ea424055 JB |
115 | #else |
116 | #define call_trace (-1) | |
117 | #endif | |
1da177e4 LT |
118 | |
119 | #ifdef CONFIG_KALLSYMS | |
3ac94932 IM |
120 | void printk_address(unsigned long address) |
121 | { | |
1da177e4 LT |
122 | unsigned long offset = 0, symsize; |
123 | const char *symname; | |
124 | char *modname; | |
3ac94932 | 125 | char *delim = ":"; |
1da177e4 LT |
126 | char namebuf[128]; |
127 | ||
3ac94932 IM |
128 | symname = kallsyms_lookup(address, &symsize, &offset, |
129 | &modname, namebuf); | |
130 | if (!symname) { | |
131 | printk(" [<%016lx>]\n", address); | |
132 | return; | |
133 | } | |
134 | if (!modname) | |
1da177e4 | 135 | modname = delim = ""; |
3ac94932 IM |
136 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
137 | address, delim, modname, delim, symname, offset, symsize); | |
138 | } | |
1da177e4 | 139 | #else |
3ac94932 IM |
140 | void printk_address(unsigned long address) |
141 | { | |
142 | printk(" [<%016lx>]\n", address); | |
143 | } | |
1da177e4 LT |
144 | #endif |
145 | ||
0a658002 | 146 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 147 | unsigned *usedp, char **idp) |
0a658002 | 148 | { |
b556b35e | 149 | static char ids[][8] = { |
0a658002 AK |
150 | [DEBUG_STACK - 1] = "#DB", |
151 | [NMI_STACK - 1] = "NMI", | |
152 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
153 | [STACKFAULT_STACK - 1] = "#SS", | |
154 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
155 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
156 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
157 | #endif | |
0a658002 AK |
158 | }; |
159 | unsigned k; | |
1da177e4 | 160 | |
c9ca1ba5 IM |
161 | /* |
162 | * Iterate over all exception stacks, and figure out whether | |
163 | * 'stack' is in one of them: | |
164 | */ | |
0a658002 | 165 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 166 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
167 | /* |
168 | * Is 'stack' above this exception frame's end? | |
169 | * If yes then skip to the next frame. | |
170 | */ | |
0a658002 AK |
171 | if (stack >= end) |
172 | continue; | |
c9ca1ba5 IM |
173 | /* |
174 | * Is 'stack' above this exception frame's start address? | |
175 | * If yes then we found the right frame. | |
176 | */ | |
0a658002 | 177 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
178 | /* |
179 | * Make sure we only iterate through an exception | |
180 | * stack once. If it comes up for the second time | |
181 | * then there's something wrong going on - just | |
182 | * break out and return NULL: | |
183 | */ | |
0a658002 AK |
184 | if (*usedp & (1U << k)) |
185 | break; | |
186 | *usedp |= 1U << k; | |
187 | *idp = ids[k]; | |
188 | return (unsigned long *)end; | |
189 | } | |
c9ca1ba5 IM |
190 | /* |
191 | * If this is a debug stack, and if it has a larger size than | |
192 | * the usual exception stacks, then 'stack' might still | |
193 | * be within the lower portion of the debug stack: | |
194 | */ | |
b556b35e JB |
195 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
196 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
197 | unsigned j = N_EXCEPTION_STACKS - 1; | |
198 | ||
c9ca1ba5 IM |
199 | /* |
200 | * Black magic. A large debug stack is composed of | |
201 | * multiple exception stack entries, which we | |
202 | * iterate through now. Dont look: | |
203 | */ | |
b556b35e JB |
204 | do { |
205 | ++j; | |
206 | end -= EXCEPTION_STKSZ; | |
207 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
208 | } while (stack < end - EXCEPTION_STKSZ); | |
209 | if (*usedp & (1U << j)) | |
210 | break; | |
211 | *usedp |= 1U << j; | |
212 | *idp = ids[j]; | |
213 | return (unsigned long *)end; | |
214 | } | |
215 | #endif | |
1da177e4 LT |
216 | } |
217 | return NULL; | |
0a658002 | 218 | } |
1da177e4 | 219 | |
c0b766f1 AK |
220 | struct ops_and_data { |
221 | struct stacktrace_ops *ops; | |
222 | void *data; | |
223 | }; | |
224 | ||
225 | static int dump_trace_unwind(struct unwind_frame_info *info, void *context) | |
b538ed27 | 226 | { |
c0b766f1 | 227 | struct ops_and_data *oad = (struct ops_and_data *)context; |
3ac94932 | 228 | int n = 0; |
359ad0d4 | 229 | unsigned long sp = UNW_SP(info); |
b538ed27 | 230 | |
359ad0d4 JB |
231 | if (arch_unw_user_mode(info)) |
232 | return -1; | |
b538ed27 | 233 | while (unwind(info) == 0 && UNW_PC(info)) { |
3ac94932 | 234 | n++; |
c0b766f1 | 235 | oad->ops->address(oad->data, UNW_PC(info)); |
b538ed27 JB |
236 | if (arch_unw_user_mode(info)) |
237 | break; | |
359ad0d4 JB |
238 | if ((sp & ~(PAGE_SIZE - 1)) == (UNW_SP(info) & ~(PAGE_SIZE - 1)) |
239 | && sp > UNW_SP(info)) | |
240 | break; | |
241 | sp = UNW_SP(info); | |
b538ed27 | 242 | } |
c33bd9aa | 243 | return n; |
b538ed27 JB |
244 | } |
245 | ||
b615ebda AK |
246 | #define MSG(txt) ops->warning(data, txt) |
247 | ||
1da177e4 LT |
248 | /* |
249 | * x86-64 can have upto three kernel stacks: | |
250 | * process stack | |
251 | * interrupt stack | |
0a658002 | 252 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
253 | */ |
254 | ||
c547c77e AK |
255 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
256 | { | |
257 | void *t = (void *)tinfo; | |
258 | return p > t && p < t + THREAD_SIZE - 3; | |
259 | } | |
260 | ||
b615ebda AK |
261 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
262 | unsigned long *stack, | |
c0b766f1 | 263 | struct stacktrace_ops *ops, void *data) |
1da177e4 | 264 | { |
da68933e | 265 | const unsigned cpu = get_cpu(); |
b615ebda | 266 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 267 | unsigned used = 0; |
c547c77e | 268 | struct thread_info *tinfo; |
1da177e4 | 269 | |
b538ed27 JB |
270 | if (!tsk) |
271 | tsk = current; | |
272 | ||
c33bd9aa JB |
273 | if (call_trace >= 0) { |
274 | int unw_ret = 0; | |
275 | struct unwind_frame_info info; | |
c0b766f1 | 276 | struct ops_and_data oad = { .ops = ops, .data = data }; |
c33bd9aa JB |
277 | |
278 | if (regs) { | |
279 | if (unwind_init_frame_info(&info, tsk, regs) == 0) | |
c0b766f1 | 280 | unw_ret = dump_trace_unwind(&info, &oad); |
c33bd9aa | 281 | } else if (tsk == current) |
b615ebda AK |
282 | unw_ret = unwind_init_running(&info, dump_trace_unwind, |
283 | &oad); | |
c33bd9aa JB |
284 | else { |
285 | if (unwind_init_blocked(&info, tsk) == 0) | |
c0b766f1 | 286 | unw_ret = dump_trace_unwind(&info, &oad); |
b538ed27 | 287 | } |
ea424055 JB |
288 | if (unw_ret > 0) { |
289 | if (call_trace == 1 && !arch_unw_user_mode(&info)) { | |
b615ebda | 290 | ops->warning_symbol(data, |
dd315df1 | 291 | "DWARF2 unwinder stuck at %s", |
ea424055 JB |
292 | UNW_PC(&info)); |
293 | if ((long)UNW_SP(&info) < 0) { | |
b615ebda | 294 | MSG("Leftover inexact backtrace:"); |
ea424055 | 295 | stack = (unsigned long *)UNW_SP(&info); |
be7a9170 | 296 | if (!stack) |
da68933e | 297 | goto out; |
ea424055 | 298 | } else |
dd315df1 | 299 | MSG("Full inexact backtrace again:"); |
ea424055 | 300 | } else if (call_trace >= 1) |
da68933e | 301 | goto out; |
b13761ec | 302 | else |
dd315df1 | 303 | MSG("Full inexact backtrace again:"); |
ea424055 | 304 | } else |
dd315df1 | 305 | MSG("Inexact backtrace:"); |
c0b766f1 AK |
306 | } |
307 | if (!stack) { | |
308 | unsigned long dummy; | |
309 | stack = &dummy; | |
310 | if (tsk && tsk != current) | |
311 | stack = (unsigned long *)tsk->thread.rsp; | |
b538ed27 JB |
312 | } |
313 | ||
c9ca1ba5 IM |
314 | /* |
315 | * Print function call entries within a stack. 'cond' is the | |
316 | * "end of stackframe" condition, that the 'stack++' | |
317 | * iteration will eventually trigger. | |
318 | */ | |
0a658002 AK |
319 | #define HANDLE_STACK(cond) \ |
320 | do while (cond) { \ | |
1b2f6304 | 321 | unsigned long addr = *stack++; \ |
446f713b AK |
322 | /* Use unlocked access here because except for NMIs \ |
323 | we should be already protected against module unloads */ \ | |
324 | if (__kernel_text_address(addr)) { \ | |
0a658002 AK |
325 | /* \ |
326 | * If the address is either in the text segment of the \ | |
327 | * kernel, or in the region which contains vmalloc'ed \ | |
328 | * memory, it *may* be the address of a calling \ | |
329 | * routine; if so, print it so that someone tracing \ | |
330 | * down the cause of the crash will be able to figure \ | |
331 | * out the call path that was taken. \ | |
332 | */ \ | |
c0b766f1 | 333 | ops->address(data, addr); \ |
0a658002 AK |
334 | } \ |
335 | } while (0) | |
336 | ||
c9ca1ba5 IM |
337 | /* |
338 | * Print function call entries in all stacks, starting at the | |
339 | * current stack address. If the stacks consist of nested | |
340 | * exceptions | |
341 | */ | |
c0b766f1 AK |
342 | for (;;) { |
343 | char *id; | |
0a658002 AK |
344 | unsigned long *estack_end; |
345 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
346 | &used, &id); | |
347 | ||
348 | if (estack_end) { | |
c0b766f1 AK |
349 | if (ops->stack(data, id) < 0) |
350 | break; | |
0a658002 | 351 | HANDLE_STACK (stack < estack_end); |
c0b766f1 | 352 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
353 | /* |
354 | * We link to the next stack via the | |
355 | * second-to-last pointer (index -2 to end) in the | |
356 | * exception stack: | |
357 | */ | |
0a658002 AK |
358 | stack = (unsigned long *) estack_end[-2]; |
359 | continue; | |
1da177e4 | 360 | } |
0a658002 AK |
361 | if (irqstack_end) { |
362 | unsigned long *irqstack; | |
363 | irqstack = irqstack_end - | |
364 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
365 | ||
366 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
367 | if (ops->stack(data, "IRQ") < 0) |
368 | break; | |
0a658002 | 369 | HANDLE_STACK (stack < irqstack_end); |
c9ca1ba5 IM |
370 | /* |
371 | * We link to the next stack (which would be | |
372 | * the process stack normally) the last | |
373 | * pointer (index -1 to end) in the IRQ stack: | |
374 | */ | |
0a658002 AK |
375 | stack = (unsigned long *) (irqstack_end[-1]); |
376 | irqstack_end = NULL; | |
c0b766f1 | 377 | ops->stack(data, "EOI"); |
0a658002 | 378 | continue; |
1da177e4 | 379 | } |
1da177e4 | 380 | } |
0a658002 | 381 | break; |
1da177e4 | 382 | } |
0a658002 | 383 | |
c9ca1ba5 | 384 | /* |
c0b766f1 | 385 | * This handles the process stack: |
c9ca1ba5 | 386 | */ |
c547c77e AK |
387 | tinfo = current_thread_info(); |
388 | HANDLE_STACK (valid_stack_ptr(tinfo, stack)); | |
0a658002 | 389 | #undef HANDLE_STACK |
da68933e AM |
390 | out: |
391 | put_cpu(); | |
c0b766f1 AK |
392 | } |
393 | EXPORT_SYMBOL(dump_trace); | |
394 | ||
395 | static void | |
396 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
397 | { | |
398 | print_symbol(msg, symbol); | |
399 | printk("\n"); | |
400 | } | |
401 | ||
402 | static void print_trace_warning(void *data, char *msg) | |
403 | { | |
404 | printk("%s\n", msg); | |
405 | } | |
406 | ||
407 | static int print_trace_stack(void *data, char *name) | |
408 | { | |
409 | printk(" <%s> ", name); | |
410 | return 0; | |
411 | } | |
3ac94932 | 412 | |
c0b766f1 AK |
413 | static void print_trace_address(void *data, unsigned long addr) |
414 | { | |
415 | printk_address(addr); | |
416 | } | |
417 | ||
418 | static struct stacktrace_ops print_trace_ops = { | |
419 | .warning = print_trace_warning, | |
420 | .warning_symbol = print_trace_warning_symbol, | |
421 | .stack = print_trace_stack, | |
422 | .address = print_trace_address, | |
423 | }; | |
424 | ||
425 | void | |
426 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) | |
427 | { | |
428 | printk("\nCall Trace:\n"); | |
429 | dump_trace(tsk, regs, stack, &print_trace_ops, NULL); | |
1da177e4 LT |
430 | printk("\n"); |
431 | } | |
432 | ||
c0b766f1 AK |
433 | static void |
434 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp) | |
1da177e4 LT |
435 | { |
436 | unsigned long *stack; | |
437 | int i; | |
151f8cc1 | 438 | const int cpu = smp_processor_id(); |
df79efde RT |
439 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
440 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
441 | |
442 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
443 | // back trace for this cpu. | |
444 | ||
445 | if (rsp == NULL) { | |
446 | if (tsk) | |
447 | rsp = (unsigned long *)tsk->thread.rsp; | |
448 | else | |
449 | rsp = (unsigned long *)&rsp; | |
450 | } | |
451 | ||
452 | stack = rsp; | |
453 | for(i=0; i < kstack_depth_to_print; i++) { | |
454 | if (stack >= irqstack && stack <= irqstack_end) { | |
455 | if (stack == irqstack_end) { | |
456 | stack = (unsigned long *) (irqstack_end[-1]); | |
457 | printk(" <EOI> "); | |
458 | } | |
459 | } else { | |
460 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
461 | break; | |
462 | } | |
463 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
464 | printk("\n"); |
465 | printk(" %016lx", *stack++); | |
35faa714 | 466 | touch_nmi_watchdog(); |
1da177e4 | 467 | } |
b538ed27 JB |
468 | show_trace(tsk, regs, rsp); |
469 | } | |
470 | ||
471 | void show_stack(struct task_struct *tsk, unsigned long * rsp) | |
472 | { | |
473 | _show_stack(tsk, NULL, rsp); | |
1da177e4 LT |
474 | } |
475 | ||
476 | /* | |
477 | * The architecture-independent dump_stack generator | |
478 | */ | |
479 | void dump_stack(void) | |
480 | { | |
481 | unsigned long dummy; | |
b538ed27 | 482 | show_trace(NULL, NULL, &dummy); |
1da177e4 LT |
483 | } |
484 | ||
485 | EXPORT_SYMBOL(dump_stack); | |
486 | ||
487 | void show_registers(struct pt_regs *regs) | |
488 | { | |
489 | int i; | |
76381fee | 490 | int in_kernel = !user_mode(regs); |
1da177e4 | 491 | unsigned long rsp; |
151f8cc1 | 492 | const int cpu = smp_processor_id(); |
df79efde | 493 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 LT |
494 | |
495 | rsp = regs->rsp; | |
496 | ||
497 | printk("CPU %d ", cpu); | |
498 | __show_regs(regs); | |
499 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 500 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
501 | |
502 | /* | |
503 | * When in-kernel, we also print out the stack and code at the | |
504 | * time of the fault.. | |
505 | */ | |
506 | if (in_kernel) { | |
507 | ||
508 | printk("Stack: "); | |
b538ed27 | 509 | _show_stack(NULL, regs, (unsigned long*)rsp); |
1da177e4 LT |
510 | |
511 | printk("\nCode: "); | |
2b692a87 | 512 | if (regs->rip < PAGE_OFFSET) |
1da177e4 LT |
513 | goto bad; |
514 | ||
2b692a87 | 515 | for (i=0; i<20; i++) { |
1da177e4 | 516 | unsigned char c; |
2b692a87 | 517 | if (__get_user(c, &((unsigned char*)regs->rip)[i])) { |
1da177e4 LT |
518 | bad: |
519 | printk(" Bad RIP value."); | |
520 | break; | |
521 | } | |
522 | printk("%02x ", c); | |
523 | } | |
524 | } | |
525 | printk("\n"); | |
526 | } | |
527 | ||
c31a0bf3 JF |
528 | int is_valid_bugaddr(unsigned long rip) |
529 | { | |
530 | unsigned short ud2; | |
531 | ||
532 | if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2))) | |
533 | return 0; | |
534 | ||
535 | return ud2 == 0x0b0f; | |
536 | } | |
1da177e4 | 537 | |
4f60fdf6 | 538 | #ifdef CONFIG_BUG |
1da177e4 LT |
539 | void out_of_line_bug(void) |
540 | { | |
541 | BUG(); | |
542 | } | |
2ee60e17 | 543 | EXPORT_SYMBOL(out_of_line_bug); |
4f60fdf6 | 544 | #endif |
1da177e4 LT |
545 | |
546 | static DEFINE_SPINLOCK(die_lock); | |
547 | static int die_owner = -1; | |
cdc60a4c | 548 | static unsigned int die_nest_count; |
1da177e4 | 549 | |
eddb6fb9 | 550 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 551 | { |
151f8cc1 | 552 | int cpu = smp_processor_id(); |
1209140c JB |
553 | unsigned long flags; |
554 | ||
abf0f109 AM |
555 | oops_enter(); |
556 | ||
1209140c JB |
557 | /* racy, but better than risking deadlock. */ |
558 | local_irq_save(flags); | |
1da177e4 LT |
559 | if (!spin_trylock(&die_lock)) { |
560 | if (cpu == die_owner) | |
561 | /* nested oops. should stop eventually */; | |
562 | else | |
1209140c | 563 | spin_lock(&die_lock); |
1da177e4 | 564 | } |
cdc60a4c | 565 | die_nest_count++; |
1209140c | 566 | die_owner = cpu; |
1da177e4 | 567 | console_verbose(); |
1209140c JB |
568 | bust_spinlocks(1); |
569 | return flags; | |
1da177e4 LT |
570 | } |
571 | ||
eddb6fb9 | 572 | void __kprobes oops_end(unsigned long flags) |
1da177e4 LT |
573 | { |
574 | die_owner = -1; | |
1209140c | 575 | bust_spinlocks(0); |
cdc60a4c CM |
576 | die_nest_count--; |
577 | if (die_nest_count) | |
578 | /* We still own the lock */ | |
579 | local_irq_restore(flags); | |
580 | else | |
581 | /* Nest count reaches zero, release the lock. */ | |
582 | spin_unlock_irqrestore(&die_lock, flags); | |
1da177e4 | 583 | if (panic_on_oops) |
012c437d | 584 | panic("Fatal exception"); |
abf0f109 | 585 | oops_exit(); |
1209140c | 586 | } |
1da177e4 | 587 | |
eddb6fb9 | 588 | void __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
589 | { |
590 | static int die_counter; | |
591 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
592 | #ifdef CONFIG_PREEMPT | |
593 | printk("PREEMPT "); | |
594 | #endif | |
595 | #ifdef CONFIG_SMP | |
596 | printk("SMP "); | |
597 | #endif | |
598 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
599 | printk("DEBUG_PAGEALLOC"); | |
600 | #endif | |
601 | printk("\n"); | |
6e3f3617 | 602 | notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); |
1da177e4 LT |
603 | show_registers(regs); |
604 | /* Executive summary in case the oops scrolled away */ | |
605 | printk(KERN_ALERT "RIP "); | |
606 | printk_address(regs->rip); | |
607 | printk(" RSP <%016lx>\n", regs->rsp); | |
8bcc5280 VG |
608 | if (kexec_should_crash(current)) |
609 | crash_kexec(regs); | |
1da177e4 LT |
610 | } |
611 | ||
612 | void die(const char * str, struct pt_regs * regs, long err) | |
613 | { | |
1209140c JB |
614 | unsigned long flags = oops_begin(); |
615 | ||
c31a0bf3 JF |
616 | if (!user_mode(regs)) |
617 | report_bug(regs->rip); | |
618 | ||
1da177e4 | 619 | __die(str, regs, err); |
1209140c | 620 | oops_end(flags); |
1da177e4 LT |
621 | do_exit(SIGSEGV); |
622 | } | |
1da177e4 | 623 | |
fac58550 | 624 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 625 | { |
1209140c JB |
626 | unsigned long flags = oops_begin(); |
627 | ||
1da177e4 LT |
628 | /* |
629 | * We are in trouble anyway, lets at least try | |
630 | * to get a message out. | |
631 | */ | |
151f8cc1 | 632 | printk(str, smp_processor_id()); |
1da177e4 | 633 | show_registers(regs); |
8bcc5280 VG |
634 | if (kexec_should_crash(current)) |
635 | crash_kexec(regs); | |
fac58550 AK |
636 | if (do_panic || panic_on_oops) |
637 | panic("Non maskable interrupt"); | |
1209140c | 638 | oops_end(flags); |
8b1ffe95 CM |
639 | nmi_exit(); |
640 | local_irq_enable(); | |
1da177e4 LT |
641 | do_exit(SIGSEGV); |
642 | } | |
643 | ||
0f2fbdcb PP |
644 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
645 | struct pt_regs * regs, long error_code, | |
646 | siginfo_t *info) | |
1da177e4 | 647 | { |
6e3f3617 JB |
648 | struct task_struct *tsk = current; |
649 | ||
6e3f3617 JB |
650 | tsk->thread.error_code = error_code; |
651 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 652 | |
6e3f3617 | 653 | if (user_mode(regs)) { |
1da177e4 LT |
654 | if (exception_trace && unhandled_signal(tsk, signr)) |
655 | printk(KERN_INFO | |
656 | "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n", | |
657 | tsk->comm, tsk->pid, str, | |
2b692a87 | 658 | regs->rip, regs->rsp, error_code); |
1da177e4 | 659 | |
1da177e4 LT |
660 | if (info) |
661 | force_sig_info(signr, info, tsk); | |
662 | else | |
663 | force_sig(signr, tsk); | |
664 | return; | |
665 | } | |
666 | ||
667 | ||
668 | /* kernel trap */ | |
669 | { | |
670 | const struct exception_table_entry *fixup; | |
671 | fixup = search_exception_tables(regs->rip); | |
2b692a87 | 672 | if (fixup) |
1da177e4 | 673 | regs->rip = fixup->fixup; |
2b692a87 | 674 | else |
1da177e4 LT |
675 | die(str, regs, error_code); |
676 | return; | |
677 | } | |
678 | } | |
679 | ||
680 | #define DO_ERROR(trapnr, signr, str, name) \ | |
681 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
682 | { \ | |
683 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
684 | == NOTIFY_STOP) \ | |
685 | return; \ | |
40e59a61 | 686 | conditional_sti(regs); \ |
1da177e4 LT |
687 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
688 | } | |
689 | ||
690 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
691 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
692 | { \ | |
693 | siginfo_t info; \ | |
694 | info.si_signo = signr; \ | |
695 | info.si_errno = 0; \ | |
696 | info.si_code = sicode; \ | |
697 | info.si_addr = (void __user *)siaddr; \ | |
698 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
699 | == NOTIFY_STOP) \ | |
700 | return; \ | |
40e59a61 | 701 | conditional_sti(regs); \ |
1da177e4 LT |
702 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
703 | } | |
704 | ||
705 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip) | |
706 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) | |
707 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
100c0e36 | 708 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip) |
1da177e4 LT |
709 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
710 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
711 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
712 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
713 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
714 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
715 | |
716 | /* Runs on IST stack */ | |
717 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
718 | { | |
719 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
720 | 12, SIGBUS) == NOTIFY_STOP) | |
721 | return; | |
722 | preempt_conditional_sti(regs); | |
723 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
724 | preempt_conditional_cli(regs); | |
725 | } | |
eca37c18 JB |
726 | |
727 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
728 | { | |
729 | static const char str[] = "double fault"; | |
730 | struct task_struct *tsk = current; | |
731 | ||
732 | /* Return not checked because double check cannot be ignored */ | |
733 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
734 | ||
735 | tsk->thread.error_code = error_code; | |
736 | tsk->thread.trap_no = 8; | |
737 | ||
738 | /* This is always a kernel trap and never fixable (and thus must | |
739 | never return). */ | |
740 | for (;;) | |
741 | die(str, regs, error_code); | |
742 | } | |
1da177e4 | 743 | |
0f2fbdcb PP |
744 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
745 | long error_code) | |
1da177e4 | 746 | { |
6e3f3617 JB |
747 | struct task_struct *tsk = current; |
748 | ||
1da177e4 LT |
749 | conditional_sti(regs); |
750 | ||
6e3f3617 JB |
751 | tsk->thread.error_code = error_code; |
752 | tsk->thread.trap_no = 13; | |
1da177e4 | 753 | |
6e3f3617 | 754 | if (user_mode(regs)) { |
1da177e4 LT |
755 | if (exception_trace && unhandled_signal(tsk, SIGSEGV)) |
756 | printk(KERN_INFO | |
757 | "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n", | |
758 | tsk->comm, tsk->pid, | |
2b692a87 | 759 | regs->rip, regs->rsp, error_code); |
1da177e4 | 760 | |
1da177e4 LT |
761 | force_sig(SIGSEGV, tsk); |
762 | return; | |
763 | } | |
764 | ||
765 | /* kernel gp */ | |
766 | { | |
767 | const struct exception_table_entry *fixup; | |
768 | fixup = search_exception_tables(regs->rip); | |
769 | if (fixup) { | |
770 | regs->rip = fixup->fixup; | |
771 | return; | |
772 | } | |
773 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
774 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
775 | return; | |
776 | die("general protection fault", regs, error_code); | |
777 | } | |
778 | } | |
779 | ||
eddb6fb9 AK |
780 | static __kprobes void |
781 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 782 | { |
c41c5cd3 DZ |
783 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
784 | reason); | |
9c5f8be4 | 785 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 786 | |
8da5adda | 787 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
788 | panic("NMI: Not continuing"); |
789 | ||
790 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
791 | |
792 | /* Clear and disable the memory parity error line. */ | |
793 | reason = (reason & 0xf) | 4; | |
794 | outb(reason, 0x61); | |
795 | } | |
796 | ||
eddb6fb9 AK |
797 | static __kprobes void |
798 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
799 | { |
800 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
801 | show_registers(regs); | |
802 | ||
803 | /* Re-enable the IOCK line, wait for a few seconds */ | |
804 | reason = (reason & 0xf) | 8; | |
805 | outb(reason, 0x61); | |
806 | mdelay(2000); | |
807 | reason &= ~8; | |
808 | outb(reason, 0x61); | |
809 | } | |
810 | ||
eddb6fb9 AK |
811 | static __kprobes void |
812 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 DZ |
813 | { |
814 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", | |
815 | reason); | |
816 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
817 | |
818 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 819 | panic("NMI: Not continuing"); |
8da5adda | 820 | |
c41c5cd3 | 821 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
822 | } |
823 | ||
6fefb0d1 AK |
824 | /* Runs on IST stack. This code must keep interrupts off all the time. |
825 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 826 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
827 | { |
828 | unsigned char reason = 0; | |
76e4f660 AR |
829 | int cpu; |
830 | ||
831 | cpu = smp_processor_id(); | |
1da177e4 LT |
832 | |
833 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 834 | if (!cpu) |
1da177e4 LT |
835 | reason = get_nmi_reason(); |
836 | ||
837 | if (!(reason & 0xc0)) { | |
6e3f3617 | 838 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
839 | == NOTIFY_STOP) |
840 | return; | |
1da177e4 LT |
841 | /* |
842 | * Ok, so this is none of the documented NMI sources, | |
843 | * so it must be the NMI watchdog. | |
844 | */ | |
3adbbcce | 845 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 846 | return; |
3adbbcce | 847 | if (!do_nmi_callback(regs,cpu)) |
3adbbcce DZ |
848 | unknown_nmi_error(reason, regs); |
849 | ||
1da177e4 LT |
850 | return; |
851 | } | |
6e3f3617 | 852 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
853 | return; |
854 | ||
855 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
856 | ||
857 | if (reason & 0x80) | |
858 | mem_parity_error(reason, regs); | |
859 | if (reason & 0x40) | |
860 | io_check_error(reason, regs); | |
861 | } | |
862 | ||
b556b35e | 863 | /* runs on IST stack. */ |
0f2fbdcb | 864 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 LT |
865 | { |
866 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { | |
867 | return; | |
868 | } | |
40e59a61 | 869 | preempt_conditional_sti(regs); |
1da177e4 | 870 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 871 | preempt_conditional_cli(regs); |
1da177e4 LT |
872 | } |
873 | ||
6fefb0d1 AK |
874 | /* Help handler running on IST stack to switch back to user stack |
875 | for scheduling or signal handling. The actual stack switch is done in | |
876 | entry.S */ | |
eddb6fb9 | 877 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
878 | { |
879 | struct pt_regs *regs = eregs; | |
880 | /* Did already sync */ | |
881 | if (eregs == (struct pt_regs *)eregs->rsp) | |
882 | ; | |
883 | /* Exception from user space */ | |
76381fee | 884 | else if (user_mode(eregs)) |
bb049232 | 885 | regs = task_pt_regs(current); |
6fefb0d1 AK |
886 | /* Exception from kernel and interrupts are enabled. Move to |
887 | kernel process stack. */ | |
888 | else if (eregs->eflags & X86_EFLAGS_IF) | |
889 | regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs)); | |
890 | if (eregs != regs) | |
891 | *regs = *eregs; | |
892 | return regs; | |
893 | } | |
894 | ||
1da177e4 | 895 | /* runs on IST stack. */ |
0f2fbdcb PP |
896 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
897 | unsigned long error_code) | |
1da177e4 | 898 | { |
1da177e4 LT |
899 | unsigned long condition; |
900 | struct task_struct *tsk = current; | |
901 | siginfo_t info; | |
902 | ||
e9129e56 | 903 | get_debugreg(condition, 6); |
1da177e4 LT |
904 | |
905 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, | |
daeeafec | 906 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 907 | return; |
daeeafec | 908 | |
a65d17c9 | 909 | preempt_conditional_sti(regs); |
1da177e4 LT |
910 | |
911 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
912 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
913 | if (!tsk->thread.debugreg7) { | |
914 | goto clear_dr7; | |
915 | } | |
916 | } | |
917 | ||
918 | tsk->thread.debugreg6 = condition; | |
919 | ||
920 | /* Mask out spurious TF errors due to lazy TF clearing */ | |
daeeafec | 921 | if (condition & DR_STEP) { |
1da177e4 LT |
922 | /* |
923 | * The TF error should be masked out only if the current | |
924 | * process is not traced and if the TRAP flag has been set | |
925 | * previously by a tracing process (condition detected by | |
926 | * the PT_DTRACE flag); remember that the i386 TRAP flag | |
927 | * can be modified by the process itself in user mode, | |
928 | * allowing programs to debug themselves without the ptrace() | |
929 | * interface. | |
930 | */ | |
76381fee | 931 | if (!user_mode(regs)) |
1da177e4 | 932 | goto clear_TF_reenable; |
be61bff7 AK |
933 | /* |
934 | * Was the TF flag set by a debugger? If so, clear it now, | |
935 | * so that register information is correct. | |
936 | */ | |
937 | if (tsk->ptrace & PT_DTRACE) { | |
938 | regs->eflags &= ~TF_MASK; | |
939 | tsk->ptrace &= ~PT_DTRACE; | |
940 | } | |
1da177e4 LT |
941 | } |
942 | ||
943 | /* Ok, finally something we can handle */ | |
944 | tsk->thread.trap_no = 1; | |
945 | tsk->thread.error_code = error_code; | |
946 | info.si_signo = SIGTRAP; | |
947 | info.si_errno = 0; | |
948 | info.si_code = TRAP_BRKPT; | |
01b8faae JB |
949 | info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL; |
950 | force_sig_info(SIGTRAP, &info, tsk); | |
1da177e4 | 951 | |
1da177e4 | 952 | clear_dr7: |
e9129e56 | 953 | set_debugreg(0UL, 7); |
a65d17c9 | 954 | preempt_conditional_cli(regs); |
6fefb0d1 | 955 | return; |
1da177e4 LT |
956 | |
957 | clear_TF_reenable: | |
958 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
1da177e4 | 959 | regs->eflags &= ~TF_MASK; |
a65d17c9 | 960 | preempt_conditional_cli(regs); |
1da177e4 LT |
961 | } |
962 | ||
6e3f3617 | 963 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 LT |
964 | { |
965 | const struct exception_table_entry *fixup; | |
966 | fixup = search_exception_tables(regs->rip); | |
967 | if (fixup) { | |
968 | regs->rip = fixup->fixup; | |
969 | return 1; | |
970 | } | |
6e3f3617 | 971 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 972 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 973 | current->thread.trap_no = trapnr; |
1da177e4 | 974 | die(str, regs, 0); |
1da177e4 LT |
975 | return 0; |
976 | } | |
977 | ||
978 | /* | |
979 | * Note that we play around with the 'TS' bit in an attempt to get | |
980 | * the correct behaviour even in the presence of the asynchronous | |
981 | * IRQ13 behaviour | |
982 | */ | |
983 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
984 | { | |
985 | void __user *rip = (void __user *)(regs->rip); | |
986 | struct task_struct * task; | |
987 | siginfo_t info; | |
988 | unsigned short cwd, swd; | |
989 | ||
990 | conditional_sti(regs); | |
76381fee | 991 | if (!user_mode(regs) && |
6e3f3617 | 992 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
993 | return; |
994 | ||
995 | /* | |
996 | * Save the info for the exception handler and clear the error. | |
997 | */ | |
998 | task = current; | |
999 | save_init_fpu(task); | |
1000 | task->thread.trap_no = 16; | |
1001 | task->thread.error_code = 0; | |
1002 | info.si_signo = SIGFPE; | |
1003 | info.si_errno = 0; | |
1004 | info.si_code = __SI_FAULT; | |
1005 | info.si_addr = rip; | |
1006 | /* | |
1007 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
1008 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
1009 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
1010 | * fault bit. We should only be taking one exception at a time, | |
1011 | * so if this combination doesn't produce any single exception, | |
1012 | * then we have a bad program that isn't synchronizing its FPU usage | |
1013 | * and it will suffer the consequences since we won't be able to | |
1014 | * fully reproduce the context of the exception | |
1015 | */ | |
1016 | cwd = get_fpu_cwd(task); | |
1017 | swd = get_fpu_swd(task); | |
ff347b22 | 1018 | switch (swd & ~cwd & 0x3f) { |
1da177e4 LT |
1019 | case 0x000: |
1020 | default: | |
1021 | break; | |
1022 | case 0x001: /* Invalid Op */ | |
ff347b22 CE |
1023 | /* |
1024 | * swd & 0x240 == 0x040: Stack Underflow | |
1025 | * swd & 0x240 == 0x240: Stack Overflow | |
1026 | * User must clear the SF bit (0x40) if set | |
1027 | */ | |
1da177e4 LT |
1028 | info.si_code = FPE_FLTINV; |
1029 | break; | |
1030 | case 0x002: /* Denormalize */ | |
1031 | case 0x010: /* Underflow */ | |
1032 | info.si_code = FPE_FLTUND; | |
1033 | break; | |
1034 | case 0x004: /* Zero Divide */ | |
1035 | info.si_code = FPE_FLTDIV; | |
1036 | break; | |
1037 | case 0x008: /* Overflow */ | |
1038 | info.si_code = FPE_FLTOVF; | |
1039 | break; | |
1040 | case 0x020: /* Precision */ | |
1041 | info.si_code = FPE_FLTRES; | |
1042 | break; | |
1043 | } | |
1044 | force_sig_info(SIGFPE, &info, task); | |
1045 | } | |
1046 | ||
1047 | asmlinkage void bad_intr(void) | |
1048 | { | |
1049 | printk("bad interrupt"); | |
1050 | } | |
1051 | ||
1052 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
1053 | { | |
1054 | void __user *rip = (void __user *)(regs->rip); | |
1055 | struct task_struct * task; | |
1056 | siginfo_t info; | |
1057 | unsigned short mxcsr; | |
1058 | ||
1059 | conditional_sti(regs); | |
76381fee | 1060 | if (!user_mode(regs) && |
6e3f3617 | 1061 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
1062 | return; |
1063 | ||
1064 | /* | |
1065 | * Save the info for the exception handler and clear the error. | |
1066 | */ | |
1067 | task = current; | |
1068 | save_init_fpu(task); | |
1069 | task->thread.trap_no = 19; | |
1070 | task->thread.error_code = 0; | |
1071 | info.si_signo = SIGFPE; | |
1072 | info.si_errno = 0; | |
1073 | info.si_code = __SI_FAULT; | |
1074 | info.si_addr = rip; | |
1075 | /* | |
1076 | * The SIMD FPU exceptions are handled a little differently, as there | |
1077 | * is only a single status/control register. Thus, to determine which | |
1078 | * unmasked exception was caught we must mask the exception mask bits | |
1079 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1080 | */ | |
1081 | mxcsr = get_fpu_mxcsr(task); | |
1082 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
1083 | case 0x000: | |
1084 | default: | |
1085 | break; | |
1086 | case 0x001: /* Invalid Op */ | |
1087 | info.si_code = FPE_FLTINV; | |
1088 | break; | |
1089 | case 0x002: /* Denormalize */ | |
1090 | case 0x010: /* Underflow */ | |
1091 | info.si_code = FPE_FLTUND; | |
1092 | break; | |
1093 | case 0x004: /* Zero Divide */ | |
1094 | info.si_code = FPE_FLTDIV; | |
1095 | break; | |
1096 | case 0x008: /* Overflow */ | |
1097 | info.si_code = FPE_FLTOVF; | |
1098 | break; | |
1099 | case 0x020: /* Precision */ | |
1100 | info.si_code = FPE_FLTRES; | |
1101 | break; | |
1102 | } | |
1103 | force_sig_info(SIGFPE, &info, task); | |
1104 | } | |
1105 | ||
1106 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1107 | { | |
1108 | } | |
1109 | ||
1110 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1111 | { |
1112 | } | |
1113 | ||
1114 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1115 | { |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * 'math_state_restore()' saves the current math information in the | |
1120 | * old math state array, and gets the new ones from the current task | |
1121 | * | |
1122 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1123 | * Don't touch unless you *really* know how it works. | |
1124 | */ | |
1125 | asmlinkage void math_state_restore(void) | |
1126 | { | |
1127 | struct task_struct *me = current; | |
1128 | clts(); /* Allow maths ops (or we recurse) */ | |
1129 | ||
1130 | if (!used_math()) | |
1131 | init_fpu(me); | |
1132 | restore_fpu_checking(&me->thread.i387.fxsave); | |
e4f17c43 | 1133 | task_thread_info(me)->status |= TS_USEDFPU; |
e07e23e1 | 1134 | me->fpu_counter++; |
1da177e4 LT |
1135 | } |
1136 | ||
1da177e4 LT |
1137 | void __init trap_init(void) |
1138 | { | |
1139 | set_intr_gate(0,÷_error); | |
1140 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1141 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1142 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1143 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1144 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1145 | set_intr_gate(6,&invalid_op); |
1146 | set_intr_gate(7,&device_not_available); | |
1147 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1148 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1149 | set_intr_gate(10,&invalid_TSS); | |
1150 | set_intr_gate(11,&segment_not_present); | |
1151 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1152 | set_intr_gate(13,&general_protection); | |
1153 | set_intr_gate(14,&page_fault); | |
1154 | set_intr_gate(15,&spurious_interrupt_bug); | |
1155 | set_intr_gate(16,&coprocessor_error); | |
1156 | set_intr_gate(17,&alignment_check); | |
1157 | #ifdef CONFIG_X86_MCE | |
1158 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1159 | #endif | |
1160 | set_intr_gate(19,&simd_coprocessor_error); | |
1161 | ||
1162 | #ifdef CONFIG_IA32_EMULATION | |
1163 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1164 | #endif | |
1165 | ||
1da177e4 LT |
1166 | /* |
1167 | * Should be a barrier for any external CPU state. | |
1168 | */ | |
1169 | cpu_init(); | |
1170 | } | |
1171 | ||
1172 | ||
2c8c0e6b | 1173 | static int __init oops_setup(char *s) |
1da177e4 | 1174 | { |
2c8c0e6b AK |
1175 | if (!s) |
1176 | return -EINVAL; | |
1177 | if (!strcmp(s, "panic")) | |
1178 | panic_on_oops = 1; | |
1179 | return 0; | |
1da177e4 | 1180 | } |
2c8c0e6b | 1181 | early_param("oops", oops_setup); |
1da177e4 LT |
1182 | |
1183 | static int __init kstack_setup(char *s) | |
1184 | { | |
2c8c0e6b AK |
1185 | if (!s) |
1186 | return -EINVAL; | |
1da177e4 | 1187 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
2c8c0e6b | 1188 | return 0; |
1da177e4 | 1189 | } |
2c8c0e6b | 1190 | early_param("kstack", kstack_setup); |
1da177e4 | 1191 | |
ea424055 | 1192 | #ifdef CONFIG_STACK_UNWIND |
c33bd9aa JB |
1193 | static int __init call_trace_setup(char *s) |
1194 | { | |
2c8c0e6b AK |
1195 | if (!s) |
1196 | return -EINVAL; | |
c33bd9aa JB |
1197 | if (strcmp(s, "old") == 0) |
1198 | call_trace = -1; | |
1199 | else if (strcmp(s, "both") == 0) | |
1200 | call_trace = 0; | |
b13761ec | 1201 | else if (strcmp(s, "newfallback") == 0) |
c33bd9aa | 1202 | call_trace = 1; |
b13761ec AK |
1203 | else if (strcmp(s, "new") == 0) |
1204 | call_trace = 2; | |
2c8c0e6b | 1205 | return 0; |
c33bd9aa | 1206 | } |
2c8c0e6b | 1207 | early_param("call_trace", call_trace_setup); |
ea424055 | 1208 | #endif |