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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 | |
a25bd949 AV |
77 | static unsigned int code_bytes = 64; |
78 | ||
1da177e4 LT |
79 | static inline void conditional_sti(struct pt_regs *regs) |
80 | { | |
65ea5b03 | 81 | if (regs->flags & X86_EFLAGS_IF) |
1da177e4 LT |
82 | local_irq_enable(); |
83 | } | |
84 | ||
a65d17c9 JB |
85 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
86 | { | |
e8bff74a | 87 | inc_preempt_count(); |
65ea5b03 | 88 | if (regs->flags & X86_EFLAGS_IF) |
a65d17c9 JB |
89 | local_irq_enable(); |
90 | } | |
91 | ||
92 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
93 | { | |
65ea5b03 | 94 | if (regs->flags & X86_EFLAGS_IF) |
a65d17c9 | 95 | local_irq_disable(); |
40e59a61 AK |
96 | /* Make sure to not schedule here because we could be running |
97 | on an exception stack. */ | |
e8bff74a | 98 | dec_preempt_count(); |
a65d17c9 JB |
99 | } |
100 | ||
0741f4d2 | 101 | int kstack_depth_to_print = 12; |
1da177e4 | 102 | |
bc850d6b | 103 | void printk_address(unsigned long address, int reliable) |
3ac94932 | 104 | { |
a5ff677c | 105 | #ifdef CONFIG_KALLSYMS |
1da177e4 LT |
106 | unsigned long offset = 0, symsize; |
107 | const char *symname; | |
108 | char *modname; | |
3ac94932 | 109 | char *delim = ":"; |
85e2aeea | 110 | char namebuf[KSYM_NAME_LEN]; |
a5ff677c | 111 | char reliab[4] = ""; |
1da177e4 | 112 | |
3ac94932 IM |
113 | symname = kallsyms_lookup(address, &symsize, &offset, |
114 | &modname, namebuf); | |
115 | if (!symname) { | |
116 | printk(" [<%016lx>]\n", address); | |
117 | return; | |
118 | } | |
bc850d6b AV |
119 | if (!reliable) |
120 | strcpy(reliab, "? "); | |
121 | ||
3ac94932 | 122 | if (!modname) |
a5ff677c | 123 | modname = delim = ""; |
bc850d6b AV |
124 | printk(" [<%016lx>] %s%s%s%s%s+0x%lx/0x%lx\n", |
125 | address, reliab, delim, modname, delim, symname, offset, symsize); | |
1da177e4 | 126 | #else |
3ac94932 | 127 | printk(" [<%016lx>]\n", address); |
1da177e4 | 128 | #endif |
a5ff677c | 129 | } |
1da177e4 | 130 | |
0a658002 | 131 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 132 | unsigned *usedp, char **idp) |
0a658002 | 133 | { |
b556b35e | 134 | static char ids[][8] = { |
0a658002 AK |
135 | [DEBUG_STACK - 1] = "#DB", |
136 | [NMI_STACK - 1] = "NMI", | |
137 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
138 | [STACKFAULT_STACK - 1] = "#SS", | |
139 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
140 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
141 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
142 | #endif | |
0a658002 AK |
143 | }; |
144 | unsigned k; | |
1da177e4 | 145 | |
c9ca1ba5 IM |
146 | /* |
147 | * Iterate over all exception stacks, and figure out whether | |
148 | * 'stack' is in one of them: | |
149 | */ | |
0a658002 | 150 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 151 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
152 | /* |
153 | * Is 'stack' above this exception frame's end? | |
154 | * If yes then skip to the next frame. | |
155 | */ | |
0a658002 AK |
156 | if (stack >= end) |
157 | continue; | |
c9ca1ba5 IM |
158 | /* |
159 | * Is 'stack' above this exception frame's start address? | |
160 | * If yes then we found the right frame. | |
161 | */ | |
0a658002 | 162 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
163 | /* |
164 | * Make sure we only iterate through an exception | |
165 | * stack once. If it comes up for the second time | |
166 | * then there's something wrong going on - just | |
167 | * break out and return NULL: | |
168 | */ | |
0a658002 AK |
169 | if (*usedp & (1U << k)) |
170 | break; | |
171 | *usedp |= 1U << k; | |
172 | *idp = ids[k]; | |
173 | return (unsigned long *)end; | |
174 | } | |
c9ca1ba5 IM |
175 | /* |
176 | * If this is a debug stack, and if it has a larger size than | |
177 | * the usual exception stacks, then 'stack' might still | |
178 | * be within the lower portion of the debug stack: | |
179 | */ | |
b556b35e JB |
180 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
181 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
182 | unsigned j = N_EXCEPTION_STACKS - 1; | |
183 | ||
c9ca1ba5 IM |
184 | /* |
185 | * Black magic. A large debug stack is composed of | |
186 | * multiple exception stack entries, which we | |
187 | * iterate through now. Dont look: | |
188 | */ | |
b556b35e JB |
189 | do { |
190 | ++j; | |
191 | end -= EXCEPTION_STKSZ; | |
192 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
193 | } while (stack < end - EXCEPTION_STKSZ); | |
194 | if (*usedp & (1U << j)) | |
195 | break; | |
196 | *usedp |= 1U << j; | |
197 | *idp = ids[j]; | |
198 | return (unsigned long *)end; | |
199 | } | |
200 | #endif | |
1da177e4 LT |
201 | } |
202 | return NULL; | |
0a658002 | 203 | } |
1da177e4 | 204 | |
b615ebda AK |
205 | #define MSG(txt) ops->warning(data, txt) |
206 | ||
1da177e4 | 207 | /* |
676b1855 | 208 | * x86-64 can have up to three kernel stacks: |
1da177e4 LT |
209 | * process stack |
210 | * interrupt stack | |
0a658002 | 211 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
212 | */ |
213 | ||
e4a94568 AV |
214 | static inline int valid_stack_ptr(struct thread_info *tinfo, |
215 | void *p, unsigned int size, void *end) | |
c547c77e | 216 | { |
ade1af77 | 217 | void *t = tinfo; |
e4a94568 AV |
218 | if (end) { |
219 | if (p < end && p >= (end-THREAD_SIZE)) | |
220 | return 1; | |
221 | else | |
222 | return 0; | |
223 | } | |
224 | return p > t && p < t + THREAD_SIZE - size; | |
225 | } | |
226 | ||
80b51f31 AV |
227 | /* The form of the top of the frame on the stack */ |
228 | struct stack_frame { | |
229 | struct stack_frame *next_frame; | |
230 | unsigned long return_address; | |
231 | }; | |
232 | ||
233 | ||
e4a94568 AV |
234 | static inline unsigned long print_context_stack(struct thread_info *tinfo, |
235 | unsigned long *stack, unsigned long bp, | |
236 | const struct stacktrace_ops *ops, void *data, | |
237 | unsigned long *end) | |
238 | { | |
80b51f31 AV |
239 | struct stack_frame *frame = (struct stack_frame *)bp; |
240 | ||
241 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) { | |
242 | unsigned long addr; | |
243 | ||
244 | addr = *stack; | |
e4a94568 | 245 | if (__kernel_text_address(addr)) { |
80b51f31 AV |
246 | if ((unsigned long) stack == bp + 8) { |
247 | ops->address(data, addr, 1); | |
248 | frame = frame->next_frame; | |
249 | bp = (unsigned long) frame; | |
250 | } else { | |
251 | ops->address(data, addr, bp == 0); | |
252 | } | |
e4a94568 | 253 | } |
80b51f31 | 254 | stack++; |
e4a94568 AV |
255 | } |
256 | return bp; | |
c547c77e AK |
257 | } |
258 | ||
b615ebda | 259 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
bc850d6b | 260 | unsigned long *stack, unsigned long bp, |
9689ba8a | 261 | const struct stacktrace_ops *ops, void *data) |
1da177e4 | 262 | { |
da68933e | 263 | const unsigned cpu = get_cpu(); |
b615ebda | 264 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 265 | unsigned used = 0; |
c547c77e | 266 | struct thread_info *tinfo; |
1da177e4 | 267 | |
b538ed27 JB |
268 | if (!tsk) |
269 | tsk = current; | |
e4a94568 | 270 | tinfo = task_thread_info(tsk); |
b538ed27 | 271 | |
c0b766f1 AK |
272 | if (!stack) { |
273 | unsigned long dummy; | |
274 | stack = &dummy; | |
275 | if (tsk && tsk != current) | |
faca6227 | 276 | stack = (unsigned long *)tsk->thread.sp; |
b538ed27 JB |
277 | } |
278 | ||
80b51f31 AV |
279 | #ifdef CONFIG_FRAME_POINTER |
280 | if (!bp) { | |
281 | if (tsk == current) { | |
282 | /* Grab bp right from our regs */ | |
283 | asm("movq %%rbp, %0" : "=r" (bp):); | |
284 | } else { | |
285 | /* bp is the last reg pushed by switch_to */ | |
286 | bp = *(unsigned long *) tsk->thread.sp; | |
287 | } | |
288 | } | |
289 | #endif | |
290 | ||
291 | ||
0a658002 | 292 | |
c9ca1ba5 IM |
293 | /* |
294 | * Print function call entries in all stacks, starting at the | |
295 | * current stack address. If the stacks consist of nested | |
296 | * exceptions | |
297 | */ | |
c0b766f1 AK |
298 | for (;;) { |
299 | char *id; | |
0a658002 AK |
300 | unsigned long *estack_end; |
301 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
302 | &used, &id); | |
303 | ||
304 | if (estack_end) { | |
c0b766f1 AK |
305 | if (ops->stack(data, id) < 0) |
306 | break; | |
e4a94568 | 307 | |
80b51f31 AV |
308 | bp = print_context_stack(tinfo, stack, bp, ops, |
309 | data, estack_end); | |
c0b766f1 | 310 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
311 | /* |
312 | * We link to the next stack via the | |
313 | * second-to-last pointer (index -2 to end) in the | |
314 | * exception stack: | |
315 | */ | |
0a658002 AK |
316 | stack = (unsigned long *) estack_end[-2]; |
317 | continue; | |
1da177e4 | 318 | } |
0a658002 AK |
319 | if (irqstack_end) { |
320 | unsigned long *irqstack; | |
321 | irqstack = irqstack_end - | |
322 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
323 | ||
324 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
325 | if (ops->stack(data, "IRQ") < 0) |
326 | break; | |
80b51f31 AV |
327 | bp = print_context_stack(tinfo, stack, bp, |
328 | ops, data, irqstack_end); | |
c9ca1ba5 IM |
329 | /* |
330 | * We link to the next stack (which would be | |
331 | * the process stack normally) the last | |
332 | * pointer (index -1 to end) in the IRQ stack: | |
333 | */ | |
0a658002 AK |
334 | stack = (unsigned long *) (irqstack_end[-1]); |
335 | irqstack_end = NULL; | |
c0b766f1 | 336 | ops->stack(data, "EOI"); |
0a658002 | 337 | continue; |
1da177e4 | 338 | } |
1da177e4 | 339 | } |
0a658002 | 340 | break; |
1da177e4 | 341 | } |
0a658002 | 342 | |
c9ca1ba5 | 343 | /* |
c0b766f1 | 344 | * This handles the process stack: |
c9ca1ba5 | 345 | */ |
80b51f31 | 346 | bp = print_context_stack(tinfo, stack, bp, ops, data, NULL); |
da68933e | 347 | put_cpu(); |
c0b766f1 AK |
348 | } |
349 | EXPORT_SYMBOL(dump_trace); | |
350 | ||
351 | static void | |
352 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
353 | { | |
354 | print_symbol(msg, symbol); | |
355 | printk("\n"); | |
356 | } | |
357 | ||
358 | static void print_trace_warning(void *data, char *msg) | |
359 | { | |
360 | printk("%s\n", msg); | |
361 | } | |
362 | ||
363 | static int print_trace_stack(void *data, char *name) | |
364 | { | |
365 | printk(" <%s> ", name); | |
366 | return 0; | |
367 | } | |
3ac94932 | 368 | |
bc850d6b | 369 | static void print_trace_address(void *data, unsigned long addr, int reliable) |
c0b766f1 | 370 | { |
1c978b93 | 371 | touch_nmi_watchdog(); |
bc850d6b | 372 | printk_address(addr, reliable); |
c0b766f1 AK |
373 | } |
374 | ||
9689ba8a | 375 | static const struct stacktrace_ops print_trace_ops = { |
c0b766f1 AK |
376 | .warning = print_trace_warning, |
377 | .warning_symbol = print_trace_warning_symbol, | |
378 | .stack = print_trace_stack, | |
379 | .address = print_trace_address, | |
380 | }; | |
381 | ||
382 | void | |
bc850d6b AV |
383 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack, |
384 | unsigned long bp) | |
c0b766f1 AK |
385 | { |
386 | printk("\nCall Trace:\n"); | |
bc850d6b | 387 | dump_trace(tsk, regs, stack, bp, &print_trace_ops, NULL); |
1da177e4 LT |
388 | printk("\n"); |
389 | } | |
390 | ||
c0b766f1 | 391 | static void |
bc850d6b AV |
392 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *sp, |
393 | unsigned long bp) | |
1da177e4 LT |
394 | { |
395 | unsigned long *stack; | |
396 | int i; | |
151f8cc1 | 397 | const int cpu = smp_processor_id(); |
df79efde RT |
398 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
399 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
400 | |
401 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
402 | // back trace for this cpu. | |
403 | ||
65ea5b03 | 404 | if (sp == NULL) { |
1da177e4 | 405 | if (tsk) |
faca6227 | 406 | sp = (unsigned long *)tsk->thread.sp; |
1da177e4 | 407 | else |
65ea5b03 | 408 | sp = (unsigned long *)&sp; |
1da177e4 LT |
409 | } |
410 | ||
65ea5b03 | 411 | stack = sp; |
1da177e4 LT |
412 | for(i=0; i < kstack_depth_to_print; i++) { |
413 | if (stack >= irqstack && stack <= irqstack_end) { | |
414 | if (stack == irqstack_end) { | |
415 | stack = (unsigned long *) (irqstack_end[-1]); | |
416 | printk(" <EOI> "); | |
417 | } | |
418 | } else { | |
419 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
420 | break; | |
421 | } | |
422 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
423 | printk("\n"); |
424 | printk(" %016lx", *stack++); | |
35faa714 | 425 | touch_nmi_watchdog(); |
1da177e4 | 426 | } |
bc850d6b | 427 | show_trace(tsk, regs, sp, bp); |
b538ed27 JB |
428 | } |
429 | ||
65ea5b03 | 430 | void show_stack(struct task_struct *tsk, unsigned long * sp) |
b538ed27 | 431 | { |
bc850d6b | 432 | _show_stack(tsk, NULL, sp, 0); |
1da177e4 LT |
433 | } |
434 | ||
435 | /* | |
436 | * The architecture-independent dump_stack generator | |
437 | */ | |
438 | void dump_stack(void) | |
439 | { | |
440 | unsigned long dummy; | |
bc850d6b | 441 | unsigned long bp = 0; |
57c351de | 442 | |
80b51f31 AV |
443 | #ifdef CONFIG_FRAME_POINTER |
444 | if (!bp) | |
445 | asm("movq %%rbp, %0" : "=r" (bp):); | |
446 | #endif | |
447 | ||
57c351de AV |
448 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", |
449 | current->pid, current->comm, print_tainted(), | |
450 | init_utsname()->release, | |
451 | (int)strcspn(init_utsname()->version, " "), | |
452 | init_utsname()->version); | |
bc850d6b | 453 | show_trace(NULL, NULL, &dummy, bp); |
1da177e4 LT |
454 | } |
455 | ||
456 | EXPORT_SYMBOL(dump_stack); | |
457 | ||
458 | void show_registers(struct pt_regs *regs) | |
459 | { | |
460 | int i; | |
65ea5b03 | 461 | unsigned long sp; |
151f8cc1 | 462 | const int cpu = smp_processor_id(); |
df79efde | 463 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
a25bd949 AV |
464 | u8 *ip; |
465 | unsigned int code_prologue = code_bytes * 43 / 64; | |
466 | unsigned int code_len = code_bytes; | |
1da177e4 | 467 | |
65ea5b03 | 468 | sp = regs->sp; |
a25bd949 | 469 | ip = (u8 *) regs->ip - code_prologue; |
1da177e4 LT |
470 | printk("CPU %d ", cpu); |
471 | __show_regs(regs); | |
472 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 473 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
474 | |
475 | /* | |
476 | * When in-kernel, we also print out the stack and code at the | |
477 | * time of the fault.. | |
478 | */ | |
a25bd949 AV |
479 | if (!user_mode(regs)) { |
480 | unsigned char c; | |
1da177e4 | 481 | printk("Stack: "); |
bc850d6b | 482 | _show_stack(NULL, regs, (unsigned long *)sp, regs->bp); |
a25bd949 | 483 | printk("\n"); |
1da177e4 | 484 | |
a25bd949 AV |
485 | printk(KERN_EMERG "Code: "); |
486 | if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { | |
487 | /* try starting at RIP */ | |
488 | ip = (u8 *) regs->ip; | |
489 | code_len = code_len - code_prologue + 1; | |
490 | } | |
491 | for (i = 0; i < code_len; i++, ip++) { | |
492 | if (ip < (u8 *)PAGE_OFFSET || | |
493 | probe_kernel_address(ip, c)) { | |
1da177e4 LT |
494 | printk(" Bad RIP value."); |
495 | break; | |
496 | } | |
a25bd949 AV |
497 | if (ip == (u8 *)regs->ip) |
498 | printk("<%02x> ", c); | |
499 | else | |
500 | printk("%02x ", c); | |
1da177e4 LT |
501 | } |
502 | } | |
503 | printk("\n"); | |
504 | } | |
505 | ||
65ea5b03 | 506 | int is_valid_bugaddr(unsigned long ip) |
c31a0bf3 JF |
507 | { |
508 | unsigned short ud2; | |
509 | ||
65ea5b03 | 510 | if (__copy_from_user(&ud2, (const void __user *) ip, sizeof(ud2))) |
c31a0bf3 JF |
511 | return 0; |
512 | ||
513 | return ud2 == 0x0b0f; | |
514 | } | |
1da177e4 | 515 | |
39743c9e | 516 | static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; |
1da177e4 | 517 | static int die_owner = -1; |
cdc60a4c | 518 | static unsigned int die_nest_count; |
1da177e4 | 519 | |
eddb6fb9 | 520 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 521 | { |
b39b7036 | 522 | int cpu; |
1209140c JB |
523 | unsigned long flags; |
524 | ||
abf0f109 AM |
525 | oops_enter(); |
526 | ||
1209140c | 527 | /* racy, but better than risking deadlock. */ |
39743c9e | 528 | raw_local_irq_save(flags); |
b39b7036 | 529 | cpu = smp_processor_id(); |
39743c9e | 530 | if (!__raw_spin_trylock(&die_lock)) { |
1da177e4 LT |
531 | if (cpu == die_owner) |
532 | /* nested oops. should stop eventually */; | |
533 | else | |
39743c9e | 534 | __raw_spin_lock(&die_lock); |
1da177e4 | 535 | } |
cdc60a4c | 536 | die_nest_count++; |
1209140c | 537 | die_owner = cpu; |
1da177e4 | 538 | console_verbose(); |
1209140c JB |
539 | bust_spinlocks(1); |
540 | return flags; | |
1da177e4 LT |
541 | } |
542 | ||
22f5991c | 543 | void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr) |
1da177e4 LT |
544 | { |
545 | die_owner = -1; | |
1209140c | 546 | bust_spinlocks(0); |
cdc60a4c | 547 | die_nest_count--; |
39743c9e | 548 | if (!die_nest_count) |
cdc60a4c | 549 | /* Nest count reaches zero, release the lock. */ |
39743c9e AK |
550 | __raw_spin_unlock(&die_lock); |
551 | raw_local_irq_restore(flags); | |
22f5991c JB |
552 | if (!regs) { |
553 | oops_exit(); | |
554 | return; | |
555 | } | |
1da177e4 | 556 | if (panic_on_oops) |
012c437d | 557 | panic("Fatal exception"); |
abf0f109 | 558 | oops_exit(); |
22f5991c | 559 | do_exit(signr); |
1209140c | 560 | } |
1da177e4 | 561 | |
22f5991c | 562 | int __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
563 | { |
564 | static int die_counter; | |
565 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
566 | #ifdef CONFIG_PREEMPT | |
567 | printk("PREEMPT "); | |
568 | #endif | |
569 | #ifdef CONFIG_SMP | |
570 | printk("SMP "); | |
571 | #endif | |
572 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
573 | printk("DEBUG_PAGEALLOC"); | |
574 | #endif | |
575 | printk("\n"); | |
22f5991c JB |
576 | if (notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP) |
577 | return 1; | |
1da177e4 | 578 | show_registers(regs); |
bcdcd8e7 | 579 | add_taint(TAINT_DIE); |
1da177e4 LT |
580 | /* Executive summary in case the oops scrolled away */ |
581 | printk(KERN_ALERT "RIP "); | |
aafbd7eb | 582 | printk_address(regs->ip, 1); |
65ea5b03 | 583 | printk(" RSP <%016lx>\n", regs->sp); |
8bcc5280 VG |
584 | if (kexec_should_crash(current)) |
585 | crash_kexec(regs); | |
22f5991c | 586 | return 0; |
1da177e4 LT |
587 | } |
588 | ||
589 | void die(const char * str, struct pt_regs * regs, long err) | |
590 | { | |
1209140c JB |
591 | unsigned long flags = oops_begin(); |
592 | ||
c31a0bf3 | 593 | if (!user_mode(regs)) |
65ea5b03 | 594 | report_bug(regs->ip, regs); |
c31a0bf3 | 595 | |
22f5991c JB |
596 | if (__die(str, regs, err)) |
597 | regs = NULL; | |
598 | oops_end(flags, regs, SIGSEGV); | |
1da177e4 | 599 | } |
1da177e4 | 600 | |
fac58550 | 601 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 602 | { |
1209140c JB |
603 | unsigned long flags = oops_begin(); |
604 | ||
1da177e4 LT |
605 | /* |
606 | * We are in trouble anyway, lets at least try | |
607 | * to get a message out. | |
608 | */ | |
151f8cc1 | 609 | printk(str, smp_processor_id()); |
1da177e4 | 610 | show_registers(regs); |
8bcc5280 VG |
611 | if (kexec_should_crash(current)) |
612 | crash_kexec(regs); | |
fac58550 AK |
613 | if (do_panic || panic_on_oops) |
614 | panic("Non maskable interrupt"); | |
22f5991c | 615 | oops_end(flags, NULL, SIGBUS); |
8b1ffe95 CM |
616 | nmi_exit(); |
617 | local_irq_enable(); | |
22f5991c | 618 | do_exit(SIGBUS); |
1da177e4 LT |
619 | } |
620 | ||
0f2fbdcb PP |
621 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
622 | struct pt_regs * regs, long error_code, | |
623 | siginfo_t *info) | |
1da177e4 | 624 | { |
6e3f3617 JB |
625 | struct task_struct *tsk = current; |
626 | ||
6e3f3617 | 627 | if (user_mode(regs)) { |
d1895183 AK |
628 | /* |
629 | * We want error_code and trap_no set for userspace | |
630 | * faults and kernelspace faults which result in | |
631 | * die(), but not kernelspace faults which are fixed | |
632 | * up. die() gives the process no chance to handle | |
633 | * the signal and notice the kernel fault information, | |
634 | * so that won't result in polluting the information | |
635 | * about previously queued, but not yet delivered, | |
636 | * faults. See also do_general_protection below. | |
637 | */ | |
638 | tsk->thread.error_code = error_code; | |
639 | tsk->thread.trap_no = trapnr; | |
640 | ||
abd4f750 | 641 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
03252919 | 642 | printk_ratelimit()) { |
1da177e4 | 643 | printk(KERN_INFO |
03252919 | 644 | "%s[%d] trap %s ip:%lx sp:%lx error:%lx", |
1da177e4 | 645 | tsk->comm, tsk->pid, str, |
65ea5b03 | 646 | regs->ip, regs->sp, error_code); |
03252919 AK |
647 | print_vma_addr(" in ", regs->ip); |
648 | printk("\n"); | |
649 | } | |
1da177e4 | 650 | |
1da177e4 LT |
651 | if (info) |
652 | force_sig_info(signr, info, tsk); | |
653 | else | |
654 | force_sig(signr, tsk); | |
655 | return; | |
656 | } | |
657 | ||
658 | ||
b3a5acc1 HH |
659 | if (!fixup_exception(regs)) { |
660 | tsk->thread.error_code = error_code; | |
661 | tsk->thread.trap_no = trapnr; | |
662 | die(str, regs, error_code); | |
1da177e4 | 663 | } |
b3a5acc1 | 664 | return; |
1da177e4 LT |
665 | } |
666 | ||
667 | #define DO_ERROR(trapnr, signr, str, name) \ | |
668 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
669 | { \ | |
670 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
671 | == NOTIFY_STOP) \ | |
672 | return; \ | |
40e59a61 | 673 | conditional_sti(regs); \ |
1da177e4 LT |
674 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
675 | } | |
676 | ||
677 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
678 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
679 | { \ | |
680 | siginfo_t info; \ | |
681 | info.si_signo = signr; \ | |
682 | info.si_errno = 0; \ | |
683 | info.si_code = sicode; \ | |
684 | info.si_addr = (void __user *)siaddr; \ | |
fb1dac90 | 685 | trace_hardirqs_fixup(); \ |
1da177e4 LT |
686 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
687 | == NOTIFY_STOP) \ | |
688 | return; \ | |
40e59a61 | 689 | conditional_sti(regs); \ |
1da177e4 LT |
690 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
691 | } | |
692 | ||
65ea5b03 | 693 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
1da177e4 LT |
694 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) |
695 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
65ea5b03 | 696 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip) |
1da177e4 LT |
697 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
698 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
699 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
700 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
701 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
702 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
703 | |
704 | /* Runs on IST stack */ | |
705 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
706 | { | |
707 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
708 | 12, SIGBUS) == NOTIFY_STOP) | |
709 | return; | |
710 | preempt_conditional_sti(regs); | |
711 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
712 | preempt_conditional_cli(regs); | |
713 | } | |
eca37c18 JB |
714 | |
715 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
716 | { | |
717 | static const char str[] = "double fault"; | |
718 | struct task_struct *tsk = current; | |
719 | ||
720 | /* Return not checked because double check cannot be ignored */ | |
721 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
722 | ||
723 | tsk->thread.error_code = error_code; | |
724 | tsk->thread.trap_no = 8; | |
725 | ||
726 | /* This is always a kernel trap and never fixable (and thus must | |
727 | never return). */ | |
728 | for (;;) | |
729 | die(str, regs, error_code); | |
730 | } | |
1da177e4 | 731 | |
0f2fbdcb PP |
732 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
733 | long error_code) | |
1da177e4 | 734 | { |
6e3f3617 JB |
735 | struct task_struct *tsk = current; |
736 | ||
1da177e4 LT |
737 | conditional_sti(regs); |
738 | ||
6e3f3617 | 739 | if (user_mode(regs)) { |
d1895183 AK |
740 | tsk->thread.error_code = error_code; |
741 | tsk->thread.trap_no = 13; | |
742 | ||
abd4f750 | 743 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
03252919 | 744 | printk_ratelimit()) { |
1da177e4 | 745 | printk(KERN_INFO |
03252919 | 746 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", |
1da177e4 | 747 | tsk->comm, tsk->pid, |
65ea5b03 | 748 | regs->ip, regs->sp, error_code); |
03252919 AK |
749 | print_vma_addr(" in ", regs->ip); |
750 | printk("\n"); | |
751 | } | |
1da177e4 | 752 | |
1da177e4 LT |
753 | force_sig(SIGSEGV, tsk); |
754 | return; | |
755 | } | |
756 | ||
b3a5acc1 HH |
757 | if (fixup_exception(regs)) |
758 | return; | |
d1895183 | 759 | |
b3a5acc1 HH |
760 | tsk->thread.error_code = error_code; |
761 | tsk->thread.trap_no = 13; | |
762 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
763 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
764 | return; | |
765 | die("general protection fault", regs, error_code); | |
1da177e4 LT |
766 | } |
767 | ||
eddb6fb9 AK |
768 | static __kprobes void |
769 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 770 | { |
c41c5cd3 DZ |
771 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
772 | reason); | |
9c5f8be4 | 773 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 774 | |
c0d12172 DJ |
775 | #if defined(CONFIG_EDAC) |
776 | if(edac_handler_set()) { | |
777 | edac_atomic_assert_error(); | |
778 | return; | |
779 | } | |
780 | #endif | |
781 | ||
8da5adda | 782 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
783 | panic("NMI: Not continuing"); |
784 | ||
785 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
786 | |
787 | /* Clear and disable the memory parity error line. */ | |
788 | reason = (reason & 0xf) | 4; | |
789 | outb(reason, 0x61); | |
790 | } | |
791 | ||
eddb6fb9 AK |
792 | static __kprobes void |
793 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
794 | { |
795 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
796 | show_registers(regs); | |
797 | ||
798 | /* Re-enable the IOCK line, wait for a few seconds */ | |
799 | reason = (reason & 0xf) | 8; | |
800 | outb(reason, 0x61); | |
801 | mdelay(2000); | |
802 | reason &= ~8; | |
803 | outb(reason, 0x61); | |
804 | } | |
805 | ||
eddb6fb9 AK |
806 | static __kprobes void |
807 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 | 808 | { |
d3597524 JW |
809 | if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
810 | return; | |
c41c5cd3 DZ |
811 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
812 | reason); | |
813 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
814 | |
815 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 816 | panic("NMI: Not continuing"); |
8da5adda | 817 | |
c41c5cd3 | 818 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
819 | } |
820 | ||
6fefb0d1 AK |
821 | /* Runs on IST stack. This code must keep interrupts off all the time. |
822 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 823 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
824 | { |
825 | unsigned char reason = 0; | |
76e4f660 AR |
826 | int cpu; |
827 | ||
828 | cpu = smp_processor_id(); | |
1da177e4 LT |
829 | |
830 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 831 | if (!cpu) |
1da177e4 LT |
832 | reason = get_nmi_reason(); |
833 | ||
834 | if (!(reason & 0xc0)) { | |
6e3f3617 | 835 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
836 | == NOTIFY_STOP) |
837 | return; | |
1da177e4 LT |
838 | /* |
839 | * Ok, so this is none of the documented NMI sources, | |
840 | * so it must be the NMI watchdog. | |
841 | */ | |
3adbbcce | 842 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 843 | return; |
3adbbcce | 844 | if (!do_nmi_callback(regs,cpu)) |
3adbbcce DZ |
845 | unknown_nmi_error(reason, regs); |
846 | ||
1da177e4 LT |
847 | return; |
848 | } | |
6e3f3617 | 849 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
850 | return; |
851 | ||
852 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
853 | ||
854 | if (reason & 0x80) | |
855 | mem_parity_error(reason, regs); | |
856 | if (reason & 0x40) | |
857 | io_check_error(reason, regs); | |
858 | } | |
859 | ||
b556b35e | 860 | /* runs on IST stack. */ |
0f2fbdcb | 861 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 | 862 | { |
143a5d32 PZ |
863 | trace_hardirqs_fixup(); |
864 | ||
1da177e4 LT |
865 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { |
866 | return; | |
867 | } | |
40e59a61 | 868 | preempt_conditional_sti(regs); |
1da177e4 | 869 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 870 | preempt_conditional_cli(regs); |
1da177e4 LT |
871 | } |
872 | ||
6fefb0d1 AK |
873 | /* Help handler running on IST stack to switch back to user stack |
874 | for scheduling or signal handling. The actual stack switch is done in | |
875 | entry.S */ | |
eddb6fb9 | 876 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
877 | { |
878 | struct pt_regs *regs = eregs; | |
879 | /* Did already sync */ | |
65ea5b03 | 880 | if (eregs == (struct pt_regs *)eregs->sp) |
6fefb0d1 AK |
881 | ; |
882 | /* Exception from user space */ | |
76381fee | 883 | else if (user_mode(eregs)) |
bb049232 | 884 | regs = task_pt_regs(current); |
6fefb0d1 AK |
885 | /* Exception from kernel and interrupts are enabled. Move to |
886 | kernel process stack. */ | |
65ea5b03 PA |
887 | else if (eregs->flags & X86_EFLAGS_IF) |
888 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); | |
6fefb0d1 AK |
889 | if (eregs != regs) |
890 | *regs = *eregs; | |
891 | return regs; | |
892 | } | |
893 | ||
1da177e4 | 894 | /* runs on IST stack. */ |
0f2fbdcb PP |
895 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
896 | unsigned long error_code) | |
1da177e4 | 897 | { |
1da177e4 LT |
898 | unsigned long condition; |
899 | struct task_struct *tsk = current; | |
900 | siginfo_t info; | |
901 | ||
000f4a9e PZ |
902 | trace_hardirqs_fixup(); |
903 | ||
e9129e56 | 904 | get_debugreg(condition, 6); |
1da177e4 | 905 | |
10faa81e RM |
906 | /* |
907 | * The processor cleared BTF, so don't mark that we need it set. | |
908 | */ | |
909 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); | |
910 | tsk->thread.debugctlmsr = 0; | |
911 | ||
1da177e4 | 912 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
daeeafec | 913 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 914 | return; |
daeeafec | 915 | |
a65d17c9 | 916 | preempt_conditional_sti(regs); |
1da177e4 LT |
917 | |
918 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
919 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
920 | if (!tsk->thread.debugreg7) { | |
921 | goto clear_dr7; | |
922 | } | |
923 | } | |
924 | ||
925 | tsk->thread.debugreg6 = condition; | |
926 | ||
e1f28773 RM |
927 | |
928 | /* | |
929 | * Single-stepping through TF: make sure we ignore any events in | |
930 | * kernel space (but re-enable TF when returning to user mode). | |
931 | */ | |
daeeafec | 932 | if (condition & DR_STEP) { |
76381fee | 933 | if (!user_mode(regs)) |
1da177e4 | 934 | goto clear_TF_reenable; |
1da177e4 LT |
935 | } |
936 | ||
937 | /* Ok, finally something we can handle */ | |
938 | tsk->thread.trap_no = 1; | |
939 | tsk->thread.error_code = error_code; | |
940 | info.si_signo = SIGTRAP; | |
941 | info.si_errno = 0; | |
942 | info.si_code = TRAP_BRKPT; | |
65ea5b03 | 943 | info.si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL; |
01b8faae | 944 | force_sig_info(SIGTRAP, &info, tsk); |
1da177e4 | 945 | |
1da177e4 | 946 | clear_dr7: |
e9129e56 | 947 | set_debugreg(0UL, 7); |
a65d17c9 | 948 | preempt_conditional_cli(regs); |
6fefb0d1 | 949 | return; |
1da177e4 LT |
950 | |
951 | clear_TF_reenable: | |
952 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
053de044 | 953 | regs->flags &= ~X86_EFLAGS_TF; |
a65d17c9 | 954 | preempt_conditional_cli(regs); |
1da177e4 LT |
955 | } |
956 | ||
6e3f3617 | 957 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 | 958 | { |
b3a5acc1 | 959 | if (fixup_exception(regs)) |
1da177e4 | 960 | return 1; |
b3a5acc1 | 961 | |
6e3f3617 | 962 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 963 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 964 | current->thread.trap_no = trapnr; |
1da177e4 | 965 | die(str, regs, 0); |
1da177e4 LT |
966 | return 0; |
967 | } | |
968 | ||
969 | /* | |
970 | * Note that we play around with the 'TS' bit in an attempt to get | |
971 | * the correct behaviour even in the presence of the asynchronous | |
972 | * IRQ13 behaviour | |
973 | */ | |
974 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
975 | { | |
65ea5b03 | 976 | void __user *ip = (void __user *)(regs->ip); |
1da177e4 LT |
977 | struct task_struct * task; |
978 | siginfo_t info; | |
979 | unsigned short cwd, swd; | |
980 | ||
981 | conditional_sti(regs); | |
76381fee | 982 | if (!user_mode(regs) && |
6e3f3617 | 983 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
984 | return; |
985 | ||
986 | /* | |
987 | * Save the info for the exception handler and clear the error. | |
988 | */ | |
989 | task = current; | |
990 | save_init_fpu(task); | |
991 | task->thread.trap_no = 16; | |
992 | task->thread.error_code = 0; | |
993 | info.si_signo = SIGFPE; | |
994 | info.si_errno = 0; | |
995 | info.si_code = __SI_FAULT; | |
65ea5b03 | 996 | info.si_addr = ip; |
1da177e4 LT |
997 | /* |
998 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
999 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
1000 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
1001 | * fault bit. We should only be taking one exception at a time, | |
1002 | * so if this combination doesn't produce any single exception, | |
1003 | * then we have a bad program that isn't synchronizing its FPU usage | |
1004 | * and it will suffer the consequences since we won't be able to | |
1005 | * fully reproduce the context of the exception | |
1006 | */ | |
1007 | cwd = get_fpu_cwd(task); | |
1008 | swd = get_fpu_swd(task); | |
ff347b22 | 1009 | switch (swd & ~cwd & 0x3f) { |
1da177e4 LT |
1010 | case 0x000: |
1011 | default: | |
1012 | break; | |
1013 | case 0x001: /* Invalid Op */ | |
ff347b22 CE |
1014 | /* |
1015 | * swd & 0x240 == 0x040: Stack Underflow | |
1016 | * swd & 0x240 == 0x240: Stack Overflow | |
1017 | * User must clear the SF bit (0x40) if set | |
1018 | */ | |
1da177e4 LT |
1019 | info.si_code = FPE_FLTINV; |
1020 | break; | |
1021 | case 0x002: /* Denormalize */ | |
1022 | case 0x010: /* Underflow */ | |
1023 | info.si_code = FPE_FLTUND; | |
1024 | break; | |
1025 | case 0x004: /* Zero Divide */ | |
1026 | info.si_code = FPE_FLTDIV; | |
1027 | break; | |
1028 | case 0x008: /* Overflow */ | |
1029 | info.si_code = FPE_FLTOVF; | |
1030 | break; | |
1031 | case 0x020: /* Precision */ | |
1032 | info.si_code = FPE_FLTRES; | |
1033 | break; | |
1034 | } | |
1035 | force_sig_info(SIGFPE, &info, task); | |
1036 | } | |
1037 | ||
1038 | asmlinkage void bad_intr(void) | |
1039 | { | |
1040 | printk("bad interrupt"); | |
1041 | } | |
1042 | ||
1043 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
1044 | { | |
65ea5b03 | 1045 | void __user *ip = (void __user *)(regs->ip); |
1da177e4 LT |
1046 | struct task_struct * task; |
1047 | siginfo_t info; | |
1048 | unsigned short mxcsr; | |
1049 | ||
1050 | conditional_sti(regs); | |
76381fee | 1051 | if (!user_mode(regs) && |
6e3f3617 | 1052 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
1053 | return; |
1054 | ||
1055 | /* | |
1056 | * Save the info for the exception handler and clear the error. | |
1057 | */ | |
1058 | task = current; | |
1059 | save_init_fpu(task); | |
1060 | task->thread.trap_no = 19; | |
1061 | task->thread.error_code = 0; | |
1062 | info.si_signo = SIGFPE; | |
1063 | info.si_errno = 0; | |
1064 | info.si_code = __SI_FAULT; | |
65ea5b03 | 1065 | info.si_addr = ip; |
1da177e4 LT |
1066 | /* |
1067 | * The SIMD FPU exceptions are handled a little differently, as there | |
1068 | * is only a single status/control register. Thus, to determine which | |
1069 | * unmasked exception was caught we must mask the exception mask bits | |
1070 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1071 | */ | |
1072 | mxcsr = get_fpu_mxcsr(task); | |
1073 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
1074 | case 0x000: | |
1075 | default: | |
1076 | break; | |
1077 | case 0x001: /* Invalid Op */ | |
1078 | info.si_code = FPE_FLTINV; | |
1079 | break; | |
1080 | case 0x002: /* Denormalize */ | |
1081 | case 0x010: /* Underflow */ | |
1082 | info.si_code = FPE_FLTUND; | |
1083 | break; | |
1084 | case 0x004: /* Zero Divide */ | |
1085 | info.si_code = FPE_FLTDIV; | |
1086 | break; | |
1087 | case 0x008: /* Overflow */ | |
1088 | info.si_code = FPE_FLTOVF; | |
1089 | break; | |
1090 | case 0x020: /* Precision */ | |
1091 | info.si_code = FPE_FLTRES; | |
1092 | break; | |
1093 | } | |
1094 | force_sig_info(SIGFPE, &info, task); | |
1095 | } | |
1096 | ||
1097 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1098 | { | |
1099 | } | |
1100 | ||
1101 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1102 | { |
1103 | } | |
1104 | ||
1105 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1106 | { |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * 'math_state_restore()' saves the current math information in the | |
1111 | * old math state array, and gets the new ones from the current task | |
1112 | * | |
1113 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1114 | * Don't touch unless you *really* know how it works. | |
1115 | */ | |
1116 | asmlinkage void math_state_restore(void) | |
1117 | { | |
1118 | struct task_struct *me = current; | |
1119 | clts(); /* Allow maths ops (or we recurse) */ | |
1120 | ||
1121 | if (!used_math()) | |
1122 | init_fpu(me); | |
1123 | restore_fpu_checking(&me->thread.i387.fxsave); | |
e4f17c43 | 1124 | task_thread_info(me)->status |= TS_USEDFPU; |
e07e23e1 | 1125 | me->fpu_counter++; |
1da177e4 | 1126 | } |
21db5584 | 1127 | EXPORT_SYMBOL_GPL(math_state_restore); |
1da177e4 | 1128 | |
1da177e4 LT |
1129 | void __init trap_init(void) |
1130 | { | |
1131 | set_intr_gate(0,÷_error); | |
1132 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1133 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1134 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1135 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1136 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1137 | set_intr_gate(6,&invalid_op); |
1138 | set_intr_gate(7,&device_not_available); | |
1139 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1140 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1141 | set_intr_gate(10,&invalid_TSS); | |
1142 | set_intr_gate(11,&segment_not_present); | |
1143 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1144 | set_intr_gate(13,&general_protection); | |
1145 | set_intr_gate(14,&page_fault); | |
1146 | set_intr_gate(15,&spurious_interrupt_bug); | |
1147 | set_intr_gate(16,&coprocessor_error); | |
1148 | set_intr_gate(17,&alignment_check); | |
1149 | #ifdef CONFIG_X86_MCE | |
1150 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1151 | #endif | |
1152 | set_intr_gate(19,&simd_coprocessor_error); | |
1153 | ||
1154 | #ifdef CONFIG_IA32_EMULATION | |
1155 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1156 | #endif | |
1157 | ||
1da177e4 LT |
1158 | /* |
1159 | * Should be a barrier for any external CPU state. | |
1160 | */ | |
1161 | cpu_init(); | |
1162 | } | |
1163 | ||
1164 | ||
2c8c0e6b | 1165 | static int __init oops_setup(char *s) |
1da177e4 | 1166 | { |
2c8c0e6b AK |
1167 | if (!s) |
1168 | return -EINVAL; | |
1169 | if (!strcmp(s, "panic")) | |
1170 | panic_on_oops = 1; | |
1171 | return 0; | |
1da177e4 | 1172 | } |
2c8c0e6b | 1173 | early_param("oops", oops_setup); |
1da177e4 LT |
1174 | |
1175 | static int __init kstack_setup(char *s) | |
1176 | { | |
2c8c0e6b AK |
1177 | if (!s) |
1178 | return -EINVAL; | |
1da177e4 | 1179 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
2c8c0e6b | 1180 | return 0; |
1da177e4 | 1181 | } |
2c8c0e6b | 1182 | early_param("kstack", kstack_setup); |
a25bd949 AV |
1183 | |
1184 | ||
1185 | static int __init code_bytes_setup(char *s) | |
1186 | { | |
1187 | code_bytes = simple_strtoul(s, NULL, 0); | |
1188 | if (code_bytes > 8192) | |
1189 | code_bytes = 8192; | |
1190 | ||
1191 | return 1; | |
1192 | } | |
1193 | __setup("code_bytes=", code_bytes_setup); |