Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1991, 1992 Linus Torvalds |
3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs | |
4 | * | |
5 | * Pentium III FXSR, SSE support | |
6 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
1da177e4 LT |
7 | */ |
8 | ||
9 | /* | |
10 | * 'Traps.c' handles hardware traps and faults after we have saved some | |
11 | * state in 'entry.S'. | |
12 | */ | |
badc7652 AH |
13 | #include <linux/moduleparam.h> |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/kprobes.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/utsname.h> | |
20 | #include <linux/kdebug.h> | |
1da177e4 | 21 | #include <linux/kernel.h> |
badc7652 AH |
22 | #include <linux/module.h> |
23 | #include <linux/ptrace.h> | |
1da177e4 | 24 | #include <linux/string.h> |
badc7652 AH |
25 | #include <linux/unwind.h> |
26 | #include <linux/delay.h> | |
1da177e4 | 27 | #include <linux/errno.h> |
badc7652 AH |
28 | #include <linux/kexec.h> |
29 | #include <linux/sched.h> | |
1da177e4 | 30 | #include <linux/timer.h> |
1da177e4 | 31 | #include <linux/init.h> |
c31a0bf3 | 32 | #include <linux/bug.h> |
badc7652 AH |
33 | #include <linux/nmi.h> |
34 | #include <linux/mm.h> | |
e32ede19 | 35 | |
c0d12172 DJ |
36 | #if defined(CONFIG_EDAC) |
37 | #include <linux/edac.h> | |
38 | #endif | |
39 | ||
badc7652 AH |
40 | #include <asm/stacktrace.h> |
41 | #include <asm/processor.h> | |
1da177e4 | 42 | #include <asm/debugreg.h> |
badc7652 AH |
43 | #include <asm/atomic.h> |
44 | #include <asm/system.h> | |
45 | #include <asm/unwind.h> | |
1da177e4 LT |
46 | #include <asm/desc.h> |
47 | #include <asm/i387.h> | |
badc7652 | 48 | #include <asm/nmi.h> |
1da177e4 | 49 | #include <asm/smp.h> |
badc7652 | 50 | #include <asm/io.h> |
1da177e4 | 51 | #include <asm/pgalloc.h> |
1da177e4 | 52 | #include <asm/proto.h> |
badc7652 AH |
53 | #include <asm/pda.h> |
54 | ||
55 | #include <mach_traps.h> | |
1da177e4 | 56 | |
1da177e4 LT |
57 | asmlinkage void divide_error(void); |
58 | asmlinkage void debug(void); | |
59 | asmlinkage void nmi(void); | |
60 | asmlinkage void int3(void); | |
61 | asmlinkage void overflow(void); | |
62 | asmlinkage void bounds(void); | |
63 | asmlinkage void invalid_op(void); | |
64 | asmlinkage void device_not_available(void); | |
65 | asmlinkage void double_fault(void); | |
66 | asmlinkage void coprocessor_segment_overrun(void); | |
67 | asmlinkage void invalid_TSS(void); | |
68 | asmlinkage void segment_not_present(void); | |
69 | asmlinkage void stack_segment(void); | |
70 | asmlinkage void general_protection(void); | |
71 | asmlinkage void page_fault(void); | |
72 | asmlinkage void coprocessor_error(void); | |
73 | asmlinkage void simd_coprocessor_error(void); | |
1da177e4 | 74 | asmlinkage void alignment_check(void); |
1da177e4 | 75 | asmlinkage void spurious_interrupt_bug(void); |
badc7652 | 76 | asmlinkage void machine_check(void); |
1da177e4 | 77 | |
c6425b9f | 78 | int panic_on_unrecovered_nmi; |
badc7652 | 79 | int kstack_depth_to_print = 12; |
a25bd949 | 80 | static unsigned int code_bytes = 64; |
badc7652 AH |
81 | static int ignore_nmis; |
82 | static int die_counter; | |
a25bd949 | 83 | |
1da177e4 LT |
84 | static inline void conditional_sti(struct pt_regs *regs) |
85 | { | |
65ea5b03 | 86 | if (regs->flags & X86_EFLAGS_IF) |
1da177e4 LT |
87 | local_irq_enable(); |
88 | } | |
89 | ||
a65d17c9 JB |
90 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
91 | { | |
e8bff74a | 92 | inc_preempt_count(); |
65ea5b03 | 93 | if (regs->flags & X86_EFLAGS_IF) |
a65d17c9 JB |
94 | local_irq_enable(); |
95 | } | |
96 | ||
97 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
98 | { | |
65ea5b03 | 99 | if (regs->flags & X86_EFLAGS_IF) |
a65d17c9 | 100 | local_irq_disable(); |
40e59a61 AK |
101 | /* Make sure to not schedule here because we could be running |
102 | on an exception stack. */ | |
e8bff74a | 103 | dec_preempt_count(); |
a65d17c9 JB |
104 | } |
105 | ||
bc850d6b | 106 | void printk_address(unsigned long address, int reliable) |
3ac94932 | 107 | { |
7daf705f | 108 | printk(" [<%016lx>] %s%pS\n", address, reliable ? "": "? ", (void *) address); |
a5ff677c | 109 | } |
1da177e4 | 110 | |
0a658002 | 111 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 112 | unsigned *usedp, char **idp) |
0a658002 | 113 | { |
b556b35e | 114 | static char ids[][8] = { |
0a658002 AK |
115 | [DEBUG_STACK - 1] = "#DB", |
116 | [NMI_STACK - 1] = "NMI", | |
117 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
118 | [STACKFAULT_STACK - 1] = "#SS", | |
119 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
120 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
121 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
122 | #endif | |
0a658002 AK |
123 | }; |
124 | unsigned k; | |
1da177e4 | 125 | |
c9ca1ba5 IM |
126 | /* |
127 | * Iterate over all exception stacks, and figure out whether | |
128 | * 'stack' is in one of them: | |
129 | */ | |
0a658002 | 130 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 131 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
132 | /* |
133 | * Is 'stack' above this exception frame's end? | |
134 | * If yes then skip to the next frame. | |
135 | */ | |
0a658002 AK |
136 | if (stack >= end) |
137 | continue; | |
c9ca1ba5 IM |
138 | /* |
139 | * Is 'stack' above this exception frame's start address? | |
140 | * If yes then we found the right frame. | |
141 | */ | |
0a658002 | 142 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
143 | /* |
144 | * Make sure we only iterate through an exception | |
145 | * stack once. If it comes up for the second time | |
146 | * then there's something wrong going on - just | |
147 | * break out and return NULL: | |
148 | */ | |
0a658002 AK |
149 | if (*usedp & (1U << k)) |
150 | break; | |
151 | *usedp |= 1U << k; | |
152 | *idp = ids[k]; | |
153 | return (unsigned long *)end; | |
154 | } | |
c9ca1ba5 IM |
155 | /* |
156 | * If this is a debug stack, and if it has a larger size than | |
157 | * the usual exception stacks, then 'stack' might still | |
158 | * be within the lower portion of the debug stack: | |
159 | */ | |
b556b35e JB |
160 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
161 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
162 | unsigned j = N_EXCEPTION_STACKS - 1; | |
163 | ||
c9ca1ba5 IM |
164 | /* |
165 | * Black magic. A large debug stack is composed of | |
166 | * multiple exception stack entries, which we | |
167 | * iterate through now. Dont look: | |
168 | */ | |
b556b35e JB |
169 | do { |
170 | ++j; | |
171 | end -= EXCEPTION_STKSZ; | |
172 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
173 | } while (stack < end - EXCEPTION_STKSZ); | |
174 | if (*usedp & (1U << j)) | |
175 | break; | |
176 | *usedp |= 1U << j; | |
177 | *idp = ids[j]; | |
178 | return (unsigned long *)end; | |
179 | } | |
180 | #endif | |
1da177e4 LT |
181 | } |
182 | return NULL; | |
0a658002 | 183 | } |
1da177e4 LT |
184 | |
185 | /* | |
676b1855 | 186 | * x86-64 can have up to three kernel stacks: |
1da177e4 LT |
187 | * process stack |
188 | * interrupt stack | |
0a658002 | 189 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
190 | */ |
191 | ||
e4a94568 AV |
192 | static inline int valid_stack_ptr(struct thread_info *tinfo, |
193 | void *p, unsigned int size, void *end) | |
c547c77e | 194 | { |
ade1af77 | 195 | void *t = tinfo; |
e4a94568 AV |
196 | if (end) { |
197 | if (p < end && p >= (end-THREAD_SIZE)) | |
198 | return 1; | |
199 | else | |
200 | return 0; | |
201 | } | |
202 | return p > t && p < t + THREAD_SIZE - size; | |
203 | } | |
204 | ||
80b51f31 AV |
205 | /* The form of the top of the frame on the stack */ |
206 | struct stack_frame { | |
207 | struct stack_frame *next_frame; | |
208 | unsigned long return_address; | |
209 | }; | |
210 | ||
a8c1be9d AH |
211 | static inline unsigned long |
212 | print_context_stack(struct thread_info *tinfo, | |
213 | unsigned long *stack, unsigned long bp, | |
214 | const struct stacktrace_ops *ops, void *data, | |
215 | unsigned long *end) | |
e4a94568 | 216 | { |
80b51f31 AV |
217 | struct stack_frame *frame = (struct stack_frame *)bp; |
218 | ||
219 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) { | |
220 | unsigned long addr; | |
221 | ||
222 | addr = *stack; | |
e4a94568 | 223 | if (__kernel_text_address(addr)) { |
80b51f31 AV |
224 | if ((unsigned long) stack == bp + 8) { |
225 | ops->address(data, addr, 1); | |
226 | frame = frame->next_frame; | |
227 | bp = (unsigned long) frame; | |
228 | } else { | |
229 | ops->address(data, addr, bp == 0); | |
230 | } | |
e4a94568 | 231 | } |
80b51f31 | 232 | stack++; |
e4a94568 AV |
233 | } |
234 | return bp; | |
c547c77e AK |
235 | } |
236 | ||
a8c1be9d | 237 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
bc850d6b | 238 | unsigned long *stack, unsigned long bp, |
9689ba8a | 239 | const struct stacktrace_ops *ops, void *data) |
1da177e4 | 240 | { |
da68933e | 241 | const unsigned cpu = get_cpu(); |
b615ebda | 242 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
0a658002 | 243 | unsigned used = 0; |
c547c77e | 244 | struct thread_info *tinfo; |
1da177e4 | 245 | |
a8c1be9d AH |
246 | if (!task) |
247 | task = current; | |
b538ed27 | 248 | |
c0b766f1 AK |
249 | if (!stack) { |
250 | unsigned long dummy; | |
251 | stack = &dummy; | |
a8c1be9d AH |
252 | if (task && task != current) |
253 | stack = (unsigned long *)task->thread.sp; | |
b538ed27 JB |
254 | } |
255 | ||
80b51f31 AV |
256 | #ifdef CONFIG_FRAME_POINTER |
257 | if (!bp) { | |
a8c1be9d | 258 | if (task == current) { |
80b51f31 | 259 | /* Grab bp right from our regs */ |
a8c1be9d | 260 | asm("movq %%rbp, %0" : "=r" (bp) :); |
80b51f31 AV |
261 | } else { |
262 | /* bp is the last reg pushed by switch_to */ | |
a8c1be9d | 263 | bp = *(unsigned long *) task->thread.sp; |
80b51f31 AV |
264 | } |
265 | } | |
266 | #endif | |
267 | ||
c9ca1ba5 IM |
268 | /* |
269 | * Print function call entries in all stacks, starting at the | |
270 | * current stack address. If the stacks consist of nested | |
271 | * exceptions | |
272 | */ | |
7b4fd4bb | 273 | tinfo = task_thread_info(task); |
c0b766f1 AK |
274 | for (;;) { |
275 | char *id; | |
0a658002 AK |
276 | unsigned long *estack_end; |
277 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
278 | &used, &id); | |
279 | ||
280 | if (estack_end) { | |
c0b766f1 AK |
281 | if (ops->stack(data, id) < 0) |
282 | break; | |
e4a94568 | 283 | |
80b51f31 AV |
284 | bp = print_context_stack(tinfo, stack, bp, ops, |
285 | data, estack_end); | |
c0b766f1 | 286 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
287 | /* |
288 | * We link to the next stack via the | |
289 | * second-to-last pointer (index -2 to end) in the | |
290 | * exception stack: | |
291 | */ | |
0a658002 AK |
292 | stack = (unsigned long *) estack_end[-2]; |
293 | continue; | |
1da177e4 | 294 | } |
0a658002 AK |
295 | if (irqstack_end) { |
296 | unsigned long *irqstack; | |
297 | irqstack = irqstack_end - | |
298 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
299 | ||
300 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
301 | if (ops->stack(data, "IRQ") < 0) |
302 | break; | |
80b51f31 AV |
303 | bp = print_context_stack(tinfo, stack, bp, |
304 | ops, data, irqstack_end); | |
c9ca1ba5 IM |
305 | /* |
306 | * We link to the next stack (which would be | |
307 | * the process stack normally) the last | |
308 | * pointer (index -1 to end) in the IRQ stack: | |
309 | */ | |
0a658002 AK |
310 | stack = (unsigned long *) (irqstack_end[-1]); |
311 | irqstack_end = NULL; | |
c0b766f1 | 312 | ops->stack(data, "EOI"); |
0a658002 | 313 | continue; |
1da177e4 | 314 | } |
1da177e4 | 315 | } |
0a658002 | 316 | break; |
1da177e4 | 317 | } |
0a658002 | 318 | |
c9ca1ba5 | 319 | /* |
c0b766f1 | 320 | * This handles the process stack: |
c9ca1ba5 | 321 | */ |
80b51f31 | 322 | bp = print_context_stack(tinfo, stack, bp, ops, data, NULL); |
da68933e | 323 | put_cpu(); |
c0b766f1 AK |
324 | } |
325 | EXPORT_SYMBOL(dump_trace); | |
326 | ||
327 | static void | |
328 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
329 | { | |
330 | print_symbol(msg, symbol); | |
331 | printk("\n"); | |
332 | } | |
333 | ||
334 | static void print_trace_warning(void *data, char *msg) | |
335 | { | |
336 | printk("%s\n", msg); | |
337 | } | |
338 | ||
339 | static int print_trace_stack(void *data, char *name) | |
340 | { | |
341 | printk(" <%s> ", name); | |
342 | return 0; | |
343 | } | |
3ac94932 | 344 | |
bc850d6b | 345 | static void print_trace_address(void *data, unsigned long addr, int reliable) |
c0b766f1 | 346 | { |
1c978b93 | 347 | touch_nmi_watchdog(); |
bc850d6b | 348 | printk_address(addr, reliable); |
c0b766f1 AK |
349 | } |
350 | ||
9689ba8a | 351 | static const struct stacktrace_ops print_trace_ops = { |
c0b766f1 AK |
352 | .warning = print_trace_warning, |
353 | .warning_symbol = print_trace_warning_symbol, | |
354 | .stack = print_trace_stack, | |
355 | .address = print_trace_address, | |
356 | }; | |
357 | ||
a8c1be9d AH |
358 | void show_trace(struct task_struct *task, struct pt_regs *regs, |
359 | unsigned long *stack, unsigned long bp) | |
c0b766f1 AK |
360 | { |
361 | printk("\nCall Trace:\n"); | |
a8c1be9d | 362 | dump_trace(task, regs, stack, bp, &print_trace_ops, NULL); |
1da177e4 LT |
363 | printk("\n"); |
364 | } | |
365 | ||
c0b766f1 | 366 | static void |
a8c1be9d AH |
367 | _show_stack(struct task_struct *task, struct pt_regs *regs, |
368 | unsigned long *sp, unsigned long bp) | |
1da177e4 LT |
369 | { |
370 | unsigned long *stack; | |
371 | int i; | |
151f8cc1 | 372 | const int cpu = smp_processor_id(); |
df79efde RT |
373 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
374 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
375 | |
376 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
377 | // back trace for this cpu. | |
378 | ||
65ea5b03 | 379 | if (sp == NULL) { |
a8c1be9d AH |
380 | if (task) |
381 | sp = (unsigned long *)task->thread.sp; | |
1da177e4 | 382 | else |
65ea5b03 | 383 | sp = (unsigned long *)&sp; |
1da177e4 LT |
384 | } |
385 | ||
65ea5b03 | 386 | stack = sp; |
a8c1be9d | 387 | for (i = 0; i < kstack_depth_to_print; i++) { |
1da177e4 LT |
388 | if (stack >= irqstack && stack <= irqstack_end) { |
389 | if (stack == irqstack_end) { | |
390 | stack = (unsigned long *) (irqstack_end[-1]); | |
391 | printk(" <EOI> "); | |
392 | } | |
393 | } else { | |
394 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
395 | break; | |
396 | } | |
397 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
398 | printk("\n"); |
399 | printk(" %016lx", *stack++); | |
35faa714 | 400 | touch_nmi_watchdog(); |
1da177e4 | 401 | } |
a8c1be9d | 402 | show_trace(task, regs, sp, bp); |
b538ed27 JB |
403 | } |
404 | ||
a8c1be9d | 405 | void show_stack(struct task_struct *task, unsigned long *sp) |
b538ed27 | 406 | { |
a8c1be9d | 407 | _show_stack(task, NULL, sp, 0); |
1da177e4 LT |
408 | } |
409 | ||
410 | /* | |
411 | * The architecture-independent dump_stack generator | |
412 | */ | |
413 | void dump_stack(void) | |
414 | { | |
bc850d6b | 415 | unsigned long bp = 0; |
7b4fd4bb | 416 | unsigned long stack; |
57c351de | 417 | |
80b51f31 AV |
418 | #ifdef CONFIG_FRAME_POINTER |
419 | if (!bp) | |
420 | asm("movq %%rbp, %0" : "=r" (bp):); | |
421 | #endif | |
422 | ||
57c351de AV |
423 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", |
424 | current->pid, current->comm, print_tainted(), | |
425 | init_utsname()->release, | |
426 | (int)strcspn(init_utsname()->version, " "), | |
427 | init_utsname()->version); | |
a8c1be9d | 428 | show_trace(NULL, NULL, &stack, bp); |
1da177e4 LT |
429 | } |
430 | ||
431 | EXPORT_SYMBOL(dump_stack); | |
432 | ||
433 | void show_registers(struct pt_regs *regs) | |
434 | { | |
435 | int i; | |
65ea5b03 | 436 | unsigned long sp; |
151f8cc1 | 437 | const int cpu = smp_processor_id(); |
df79efde | 438 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 | 439 | |
65ea5b03 | 440 | sp = regs->sp; |
1da177e4 LT |
441 | printk("CPU %d ", cpu); |
442 | __show_regs(regs); | |
443 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 444 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
445 | |
446 | /* | |
447 | * When in-kernel, we also print out the stack and code at the | |
448 | * time of the fault.. | |
449 | */ | |
a25bd949 | 450 | if (!user_mode(regs)) { |
7b4fd4bb AH |
451 | unsigned int code_prologue = code_bytes * 43 / 64; |
452 | unsigned int code_len = code_bytes; | |
a25bd949 | 453 | unsigned char c; |
7b4fd4bb AH |
454 | u8 *ip; |
455 | ||
1da177e4 | 456 | printk("Stack: "); |
bc850d6b | 457 | _show_stack(NULL, regs, (unsigned long *)sp, regs->bp); |
a25bd949 | 458 | printk("\n"); |
1da177e4 | 459 | |
a25bd949 | 460 | printk(KERN_EMERG "Code: "); |
7b4fd4bb AH |
461 | |
462 | ip = (u8 *)regs->ip - code_prologue; | |
a25bd949 AV |
463 | if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { |
464 | /* try starting at RIP */ | |
a8c1be9d | 465 | ip = (u8 *)regs->ip; |
a25bd949 AV |
466 | code_len = code_len - code_prologue + 1; |
467 | } | |
468 | for (i = 0; i < code_len; i++, ip++) { | |
469 | if (ip < (u8 *)PAGE_OFFSET || | |
470 | probe_kernel_address(ip, c)) { | |
1da177e4 LT |
471 | printk(" Bad RIP value."); |
472 | break; | |
473 | } | |
a25bd949 AV |
474 | if (ip == (u8 *)regs->ip) |
475 | printk("<%02x> ", c); | |
476 | else | |
477 | printk("%02x ", c); | |
1da177e4 LT |
478 | } |
479 | } | |
480 | printk("\n"); | |
a8c1be9d | 481 | } |
1da177e4 | 482 | |
65ea5b03 | 483 | int is_valid_bugaddr(unsigned long ip) |
c31a0bf3 JF |
484 | { |
485 | unsigned short ud2; | |
486 | ||
65ea5b03 | 487 | if (__copy_from_user(&ud2, (const void __user *) ip, sizeof(ud2))) |
c31a0bf3 JF |
488 | return 0; |
489 | ||
490 | return ud2 == 0x0b0f; | |
491 | } | |
1da177e4 | 492 | |
39743c9e | 493 | static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; |
1da177e4 | 494 | static int die_owner = -1; |
cdc60a4c | 495 | static unsigned int die_nest_count; |
1da177e4 | 496 | |
eddb6fb9 | 497 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 498 | { |
b39b7036 | 499 | int cpu; |
1209140c JB |
500 | unsigned long flags; |
501 | ||
abf0f109 AM |
502 | oops_enter(); |
503 | ||
1209140c | 504 | /* racy, but better than risking deadlock. */ |
39743c9e | 505 | raw_local_irq_save(flags); |
b39b7036 | 506 | cpu = smp_processor_id(); |
39743c9e | 507 | if (!__raw_spin_trylock(&die_lock)) { |
1da177e4 LT |
508 | if (cpu == die_owner) |
509 | /* nested oops. should stop eventually */; | |
510 | else | |
39743c9e | 511 | __raw_spin_lock(&die_lock); |
1da177e4 | 512 | } |
cdc60a4c | 513 | die_nest_count++; |
1209140c | 514 | die_owner = cpu; |
1da177e4 | 515 | console_verbose(); |
1209140c JB |
516 | bust_spinlocks(1); |
517 | return flags; | |
1da177e4 LT |
518 | } |
519 | ||
22f5991c | 520 | void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr) |
1da177e4 LT |
521 | { |
522 | die_owner = -1; | |
1209140c | 523 | bust_spinlocks(0); |
cdc60a4c | 524 | die_nest_count--; |
39743c9e | 525 | if (!die_nest_count) |
cdc60a4c | 526 | /* Nest count reaches zero, release the lock. */ |
39743c9e AK |
527 | __raw_spin_unlock(&die_lock); |
528 | raw_local_irq_restore(flags); | |
22f5991c JB |
529 | if (!regs) { |
530 | oops_exit(); | |
531 | return; | |
532 | } | |
1da177e4 | 533 | if (panic_on_oops) |
012c437d | 534 | panic("Fatal exception"); |
abf0f109 | 535 | oops_exit(); |
22f5991c | 536 | do_exit(signr); |
1209140c | 537 | } |
1da177e4 | 538 | |
e423f49f | 539 | int __kprobes __die(const char *str, struct pt_regs *regs, long err) |
1da177e4 | 540 | { |
e423f49f | 541 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff, ++die_counter); |
1da177e4 LT |
542 | #ifdef CONFIG_PREEMPT |
543 | printk("PREEMPT "); | |
544 | #endif | |
545 | #ifdef CONFIG_SMP | |
546 | printk("SMP "); | |
547 | #endif | |
548 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
549 | printk("DEBUG_PAGEALLOC"); | |
550 | #endif | |
551 | printk("\n"); | |
a8c1be9d AH |
552 | if (notify_die(DIE_OOPS, str, regs, err, |
553 | current->thread.trap_no, SIGSEGV) == NOTIFY_STOP) | |
22f5991c | 554 | return 1; |
a8c1be9d | 555 | |
1da177e4 | 556 | show_registers(regs); |
bcdcd8e7 | 557 | add_taint(TAINT_DIE); |
1da177e4 LT |
558 | /* Executive summary in case the oops scrolled away */ |
559 | printk(KERN_ALERT "RIP "); | |
aafbd7eb | 560 | printk_address(regs->ip, 1); |
65ea5b03 | 561 | printk(" RSP <%016lx>\n", regs->sp); |
8bcc5280 VG |
562 | if (kexec_should_crash(current)) |
563 | crash_kexec(regs); | |
22f5991c | 564 | return 0; |
1da177e4 LT |
565 | } |
566 | ||
7b4fd4bb | 567 | void die(const char *str, struct pt_regs *regs, long err) |
1da177e4 | 568 | { |
1209140c JB |
569 | unsigned long flags = oops_begin(); |
570 | ||
c31a0bf3 | 571 | if (!user_mode(regs)) |
65ea5b03 | 572 | report_bug(regs->ip, regs); |
c31a0bf3 | 573 | |
22f5991c JB |
574 | if (__die(str, regs, err)) |
575 | regs = NULL; | |
576 | oops_end(flags, regs, SIGSEGV); | |
1da177e4 | 577 | } |
1da177e4 | 578 | |
5deb45e3 SR |
579 | notrace __kprobes void |
580 | die_nmi(char *str, struct pt_regs *regs, int do_panic) | |
1da177e4 | 581 | { |
737a460f | 582 | unsigned long flags; |
1209140c | 583 | |
a8c1be9d | 584 | if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP) |
737a460f | 585 | return; |
1209140c | 586 | |
737a460f | 587 | flags = oops_begin(); |
1da177e4 LT |
588 | /* |
589 | * We are in trouble anyway, lets at least try | |
590 | * to get a message out. | |
591 | */ | |
e56b3a12 CG |
592 | printk(KERN_EMERG "%s", str); |
593 | printk(" on CPU%d, ip %08lx, registers:\n", | |
594 | smp_processor_id(), regs->ip); | |
1da177e4 | 595 | show_registers(regs); |
8bcc5280 VG |
596 | if (kexec_should_crash(current)) |
597 | crash_kexec(regs); | |
fac58550 AK |
598 | if (do_panic || panic_on_oops) |
599 | panic("Non maskable interrupt"); | |
22f5991c | 600 | oops_end(flags, NULL, SIGBUS); |
8b1ffe95 CM |
601 | nmi_exit(); |
602 | local_irq_enable(); | |
22f5991c | 603 | do_exit(SIGBUS); |
1da177e4 LT |
604 | } |
605 | ||
a8c1be9d AH |
606 | static void __kprobes |
607 | do_trap(int trapnr, int signr, char *str, struct pt_regs *regs, | |
608 | long error_code, siginfo_t *info) | |
1da177e4 | 609 | { |
6e3f3617 JB |
610 | struct task_struct *tsk = current; |
611 | ||
a7bbb0ce AH |
612 | if (!user_mode(regs)) |
613 | goto kernel_trap; | |
1da177e4 | 614 | |
a7bbb0ce AH |
615 | /* |
616 | * We want error_code and trap_no set for userspace faults and | |
617 | * kernelspace faults which result in die(), but not | |
618 | * kernelspace faults which are fixed up. die() gives the | |
619 | * process no chance to handle the signal and notice the | |
620 | * kernel fault information, so that won't result in polluting | |
621 | * the information about previously queued, but not yet | |
622 | * delivered, faults. See also do_general_protection below. | |
623 | */ | |
624 | tsk->thread.error_code = error_code; | |
625 | tsk->thread.trap_no = trapnr; | |
626 | ||
627 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && | |
628 | printk_ratelimit()) { | |
629 | printk(KERN_INFO | |
630 | "%s[%d] trap %s ip:%lx sp:%lx error:%lx", | |
631 | tsk->comm, tsk->pid, str, | |
632 | regs->ip, regs->sp, error_code); | |
633 | print_vma_addr(" in ", regs->ip); | |
634 | printk("\n"); | |
1da177e4 LT |
635 | } |
636 | ||
a7bbb0ce AH |
637 | if (info) |
638 | force_sig_info(signr, info, tsk); | |
639 | else | |
640 | force_sig(signr, tsk); | |
641 | return; | |
1da177e4 | 642 | |
a7bbb0ce | 643 | kernel_trap: |
b3a5acc1 HH |
644 | if (!fixup_exception(regs)) { |
645 | tsk->thread.error_code = error_code; | |
646 | tsk->thread.trap_no = trapnr; | |
647 | die(str, regs, error_code); | |
1da177e4 | 648 | } |
b3a5acc1 | 649 | return; |
1da177e4 LT |
650 | } |
651 | ||
652 | #define DO_ERROR(trapnr, signr, str, name) \ | |
a8c1be9d AH |
653 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ |
654 | { \ | |
655 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
656 | == NOTIFY_STOP) \ | |
657 | return; \ | |
40e59a61 | 658 | conditional_sti(regs); \ |
a8c1be9d | 659 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
1da177e4 LT |
660 | } |
661 | ||
a8c1be9d AH |
662 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
663 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
664 | { \ | |
665 | siginfo_t info; \ | |
666 | info.si_signo = signr; \ | |
667 | info.si_errno = 0; \ | |
668 | info.si_code = sicode; \ | |
669 | info.si_addr = (void __user *)siaddr; \ | |
670 | trace_hardirqs_fixup(); \ | |
671 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
672 | == NOTIFY_STOP) \ | |
673 | return; \ | |
40e59a61 | 674 | conditional_sti(regs); \ |
a8c1be9d | 675 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
1da177e4 LT |
676 | } |
677 | ||
a8c1be9d AH |
678 | DO_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
679 | DO_ERROR(4, SIGSEGV, "overflow", overflow) | |
680 | DO_ERROR(5, SIGSEGV, "bounds", bounds) | |
681 | DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip) | |
682 | DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
1da177e4 | 683 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) |
a8c1be9d | 684 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) |
1da177e4 | 685 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) |
40e59a61 AK |
686 | |
687 | /* Runs on IST stack */ | |
688 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
689 | { | |
690 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
691 | 12, SIGBUS) == NOTIFY_STOP) | |
692 | return; | |
693 | preempt_conditional_sti(regs); | |
694 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
695 | preempt_conditional_cli(regs); | |
696 | } | |
eca37c18 JB |
697 | |
698 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
699 | { | |
700 | static const char str[] = "double fault"; | |
701 | struct task_struct *tsk = current; | |
702 | ||
703 | /* Return not checked because double check cannot be ignored */ | |
704 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
705 | ||
706 | tsk->thread.error_code = error_code; | |
707 | tsk->thread.trap_no = 8; | |
708 | ||
709 | /* This is always a kernel trap and never fixable (and thus must | |
710 | never return). */ | |
711 | for (;;) | |
712 | die(str, regs, error_code); | |
713 | } | |
1da177e4 | 714 | |
13485ab5 AH |
715 | asmlinkage void __kprobes |
716 | do_general_protection(struct pt_regs *regs, long error_code) | |
1da177e4 | 717 | { |
13485ab5 | 718 | struct task_struct *tsk; |
6e3f3617 | 719 | |
1da177e4 LT |
720 | conditional_sti(regs); |
721 | ||
13485ab5 AH |
722 | tsk = current; |
723 | if (!user_mode(regs)) | |
724 | goto gp_in_kernel; | |
1da177e4 | 725 | |
13485ab5 AH |
726 | tsk->thread.error_code = error_code; |
727 | tsk->thread.trap_no = 13; | |
728 | ||
729 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && | |
730 | printk_ratelimit()) { | |
731 | printk(KERN_INFO | |
732 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", | |
733 | tsk->comm, tsk->pid, | |
734 | regs->ip, regs->sp, error_code); | |
735 | print_vma_addr(" in ", regs->ip); | |
736 | printk("\n"); | |
737 | } | |
738 | ||
739 | force_sig(SIGSEGV, tsk); | |
740 | return; | |
1da177e4 | 741 | |
13485ab5 | 742 | gp_in_kernel: |
b3a5acc1 HH |
743 | if (fixup_exception(regs)) |
744 | return; | |
d1895183 | 745 | |
b3a5acc1 HH |
746 | tsk->thread.error_code = error_code; |
747 | tsk->thread.trap_no = 13; | |
748 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
749 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
750 | return; | |
751 | die("general protection fault", regs, error_code); | |
1da177e4 LT |
752 | } |
753 | ||
5deb45e3 | 754 | static notrace __kprobes void |
a8c1be9d | 755 | mem_parity_error(unsigned char reason, struct pt_regs *regs) |
1da177e4 | 756 | { |
c41c5cd3 DZ |
757 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
758 | reason); | |
9c5f8be4 | 759 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 760 | |
c0d12172 | 761 | #if defined(CONFIG_EDAC) |
a8c1be9d | 762 | if (edac_handler_set()) { |
c0d12172 DJ |
763 | edac_atomic_assert_error(); |
764 | return; | |
765 | } | |
766 | #endif | |
767 | ||
8da5adda | 768 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
769 | panic("NMI: Not continuing"); |
770 | ||
771 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
772 | |
773 | /* Clear and disable the memory parity error line. */ | |
774 | reason = (reason & 0xf) | 4; | |
775 | outb(reason, 0x61); | |
776 | } | |
777 | ||
5deb45e3 | 778 | static notrace __kprobes void |
a8c1be9d | 779 | io_check_error(unsigned char reason, struct pt_regs *regs) |
1da177e4 LT |
780 | { |
781 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
782 | show_registers(regs); | |
783 | ||
784 | /* Re-enable the IOCK line, wait for a few seconds */ | |
785 | reason = (reason & 0xf) | 8; | |
786 | outb(reason, 0x61); | |
787 | mdelay(2000); | |
788 | reason &= ~8; | |
789 | outb(reason, 0x61); | |
790 | } | |
791 | ||
5deb45e3 | 792 | static notrace __kprobes void |
eddb6fb9 | 793 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) |
c41c5cd3 | 794 | { |
d3597524 JW |
795 | if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
796 | return; | |
c41c5cd3 DZ |
797 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
798 | reason); | |
799 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
800 | |
801 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 802 | panic("NMI: Not continuing"); |
8da5adda | 803 | |
c41c5cd3 | 804 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
805 | } |
806 | ||
6fefb0d1 AK |
807 | /* Runs on IST stack. This code must keep interrupts off all the time. |
808 | Nested NMIs are prevented by the CPU. */ | |
abd34807 | 809 | asmlinkage notrace __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
810 | { |
811 | unsigned char reason = 0; | |
76e4f660 AR |
812 | int cpu; |
813 | ||
814 | cpu = smp_processor_id(); | |
1da177e4 | 815 | |
a8c1be9d | 816 | /* Only the BSP gets external NMIs from the system. */ |
76e4f660 | 817 | if (!cpu) |
1da177e4 LT |
818 | reason = get_nmi_reason(); |
819 | ||
820 | if (!(reason & 0xc0)) { | |
6e3f3617 | 821 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
822 | == NOTIFY_STOP) |
823 | return; | |
1da177e4 LT |
824 | /* |
825 | * Ok, so this is none of the documented NMI sources, | |
826 | * so it must be the NMI watchdog. | |
827 | */ | |
a8c1be9d | 828 | if (nmi_watchdog_tick(regs, reason)) |
1da177e4 | 829 | return; |
a8c1be9d | 830 | if (!do_nmi_callback(regs, cpu)) |
3adbbcce DZ |
831 | unknown_nmi_error(reason, regs); |
832 | ||
1da177e4 LT |
833 | return; |
834 | } | |
6e3f3617 | 835 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
a8c1be9d | 836 | return; |
1da177e4 LT |
837 | |
838 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
1da177e4 LT |
839 | if (reason & 0x80) |
840 | mem_parity_error(reason, regs); | |
841 | if (reason & 0x40) | |
842 | io_check_error(reason, regs); | |
843 | } | |
844 | ||
c6425b9f CG |
845 | asmlinkage notrace __kprobes void |
846 | do_nmi(struct pt_regs *regs, long error_code) | |
847 | { | |
848 | nmi_enter(); | |
a8c1be9d | 849 | |
c6425b9f | 850 | add_pda(__nmi_count, 1); |
a8c1be9d | 851 | |
c6425b9f CG |
852 | if (!ignore_nmis) |
853 | default_do_nmi(regs); | |
a8c1be9d | 854 | |
c6425b9f CG |
855 | nmi_exit(); |
856 | } | |
857 | ||
858 | void stop_nmi(void) | |
859 | { | |
860 | acpi_nmi_disable(); | |
861 | ignore_nmis++; | |
862 | } | |
863 | ||
864 | void restart_nmi(void) | |
865 | { | |
866 | ignore_nmis--; | |
867 | acpi_nmi_enable(); | |
868 | } | |
869 | ||
b556b35e | 870 | /* runs on IST stack. */ |
a8c1be9d | 871 | asmlinkage void __kprobes do_int3(struct pt_regs *regs, long error_code) |
1da177e4 | 872 | { |
143a5d32 PZ |
873 | trace_hardirqs_fixup(); |
874 | ||
a8c1be9d AH |
875 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) |
876 | == NOTIFY_STOP) | |
1da177e4 | 877 | return; |
a8c1be9d | 878 | |
40e59a61 | 879 | preempt_conditional_sti(regs); |
1da177e4 | 880 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 881 | preempt_conditional_cli(regs); |
1da177e4 LT |
882 | } |
883 | ||
6fefb0d1 AK |
884 | /* Help handler running on IST stack to switch back to user stack |
885 | for scheduling or signal handling. The actual stack switch is done in | |
886 | entry.S */ | |
eddb6fb9 | 887 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
888 | { |
889 | struct pt_regs *regs = eregs; | |
890 | /* Did already sync */ | |
65ea5b03 | 891 | if (eregs == (struct pt_regs *)eregs->sp) |
6fefb0d1 AK |
892 | ; |
893 | /* Exception from user space */ | |
76381fee | 894 | else if (user_mode(eregs)) |
bb049232 | 895 | regs = task_pt_regs(current); |
6fefb0d1 AK |
896 | /* Exception from kernel and interrupts are enabled. Move to |
897 | kernel process stack. */ | |
65ea5b03 PA |
898 | else if (eregs->flags & X86_EFLAGS_IF) |
899 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); | |
6fefb0d1 AK |
900 | if (eregs != regs) |
901 | *regs = *eregs; | |
902 | return regs; | |
903 | } | |
904 | ||
1da177e4 | 905 | /* runs on IST stack. */ |
0f2fbdcb PP |
906 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
907 | unsigned long error_code) | |
1da177e4 | 908 | { |
1da177e4 | 909 | struct task_struct *tsk = current; |
7b4fd4bb | 910 | unsigned long condition; |
1da177e4 LT |
911 | siginfo_t info; |
912 | ||
000f4a9e PZ |
913 | trace_hardirqs_fixup(); |
914 | ||
e9129e56 | 915 | get_debugreg(condition, 6); |
1da177e4 | 916 | |
10faa81e RM |
917 | /* |
918 | * The processor cleared BTF, so don't mark that we need it set. | |
919 | */ | |
920 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); | |
921 | tsk->thread.debugctlmsr = 0; | |
922 | ||
1da177e4 | 923 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
daeeafec | 924 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 925 | return; |
daeeafec | 926 | |
a65d17c9 | 927 | preempt_conditional_sti(regs); |
1da177e4 LT |
928 | |
929 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
930 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
a8c1be9d | 931 | if (!tsk->thread.debugreg7) |
1da177e4 | 932 | goto clear_dr7; |
1da177e4 LT |
933 | } |
934 | ||
935 | tsk->thread.debugreg6 = condition; | |
936 | ||
e1f28773 RM |
937 | /* |
938 | * Single-stepping through TF: make sure we ignore any events in | |
939 | * kernel space (but re-enable TF when returning to user mode). | |
940 | */ | |
daeeafec | 941 | if (condition & DR_STEP) { |
a8c1be9d AH |
942 | if (!user_mode(regs)) |
943 | goto clear_TF_reenable; | |
1da177e4 LT |
944 | } |
945 | ||
946 | /* Ok, finally something we can handle */ | |
947 | tsk->thread.trap_no = 1; | |
948 | tsk->thread.error_code = error_code; | |
949 | info.si_signo = SIGTRAP; | |
950 | info.si_errno = 0; | |
951 | info.si_code = TRAP_BRKPT; | |
65ea5b03 | 952 | info.si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL; |
01b8faae | 953 | force_sig_info(SIGTRAP, &info, tsk); |
1da177e4 | 954 | |
1da177e4 | 955 | clear_dr7: |
a8c1be9d | 956 | set_debugreg(0, 7); |
a65d17c9 | 957 | preempt_conditional_cli(regs); |
6fefb0d1 | 958 | return; |
1da177e4 LT |
959 | |
960 | clear_TF_reenable: | |
961 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
053de044 | 962 | regs->flags &= ~X86_EFLAGS_TF; |
a65d17c9 | 963 | preempt_conditional_cli(regs); |
a8c1be9d | 964 | return; |
1da177e4 LT |
965 | } |
966 | ||
6e3f3617 | 967 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 | 968 | { |
b3a5acc1 | 969 | if (fixup_exception(regs)) |
1da177e4 | 970 | return 1; |
b3a5acc1 | 971 | |
6e3f3617 | 972 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 973 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 974 | current->thread.trap_no = trapnr; |
1da177e4 | 975 | die(str, regs, 0); |
1da177e4 LT |
976 | return 0; |
977 | } | |
978 | ||
979 | /* | |
980 | * Note that we play around with the 'TS' bit in an attempt to get | |
981 | * the correct behaviour even in the presence of the asynchronous | |
982 | * IRQ13 behaviour | |
983 | */ | |
984 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
985 | { | |
65ea5b03 | 986 | void __user *ip = (void __user *)(regs->ip); |
a8c1be9d | 987 | struct task_struct *task; |
1da177e4 LT |
988 | siginfo_t info; |
989 | unsigned short cwd, swd; | |
990 | ||
991 | conditional_sti(regs); | |
76381fee | 992 | if (!user_mode(regs) && |
6e3f3617 | 993 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
994 | return; |
995 | ||
996 | /* | |
997 | * Save the info for the exception handler and clear the error. | |
998 | */ | |
999 | task = current; | |
1000 | save_init_fpu(task); | |
1001 | task->thread.trap_no = 16; | |
1002 | task->thread.error_code = 0; | |
1003 | info.si_signo = SIGFPE; | |
1004 | info.si_errno = 0; | |
1005 | info.si_code = __SI_FAULT; | |
65ea5b03 | 1006 | info.si_addr = ip; |
1da177e4 LT |
1007 | /* |
1008 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
1009 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
1010 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
1011 | * fault bit. We should only be taking one exception at a time, | |
1012 | * so if this combination doesn't produce any single exception, | |
1013 | * then we have a bad program that isn't synchronizing its FPU usage | |
1014 | * and it will suffer the consequences since we won't be able to | |
1015 | * fully reproduce the context of the exception | |
1016 | */ | |
1017 | cwd = get_fpu_cwd(task); | |
1018 | swd = get_fpu_swd(task); | |
ff347b22 | 1019 | switch (swd & ~cwd & 0x3f) { |
a8c1be9d AH |
1020 | case 0x000: /* No unmasked exception */ |
1021 | default: /* Multiple exceptions */ | |
1022 | break; | |
1023 | case 0x001: /* Invalid Op */ | |
1024 | /* | |
1025 | * swd & 0x240 == 0x040: Stack Underflow | |
1026 | * swd & 0x240 == 0x240: Stack Overflow | |
1027 | * User must clear the SF bit (0x40) if set | |
1028 | */ | |
1029 | info.si_code = FPE_FLTINV; | |
1030 | break; | |
1031 | case 0x002: /* Denormalize */ | |
1032 | case 0x010: /* Underflow */ | |
1033 | info.si_code = FPE_FLTUND; | |
1034 | break; | |
1035 | case 0x004: /* Zero Divide */ | |
1036 | info.si_code = FPE_FLTDIV; | |
1037 | break; | |
1038 | case 0x008: /* Overflow */ | |
1039 | info.si_code = FPE_FLTOVF; | |
1040 | break; | |
1041 | case 0x020: /* Precision */ | |
1042 | info.si_code = FPE_FLTRES; | |
1043 | break; | |
1da177e4 LT |
1044 | } |
1045 | force_sig_info(SIGFPE, &info, task); | |
1046 | } | |
1047 | ||
1048 | asmlinkage void bad_intr(void) | |
1049 | { | |
1050 | printk("bad interrupt"); | |
1051 | } | |
1052 | ||
1053 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
1054 | { | |
65ea5b03 | 1055 | void __user *ip = (void __user *)(regs->ip); |
a8c1be9d | 1056 | struct task_struct *task; |
1da177e4 LT |
1057 | siginfo_t info; |
1058 | unsigned short mxcsr; | |
1059 | ||
1060 | conditional_sti(regs); | |
76381fee | 1061 | if (!user_mode(regs) && |
6e3f3617 | 1062 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
1063 | return; |
1064 | ||
1065 | /* | |
1066 | * Save the info for the exception handler and clear the error. | |
1067 | */ | |
1068 | task = current; | |
1069 | save_init_fpu(task); | |
1070 | task->thread.trap_no = 19; | |
1071 | task->thread.error_code = 0; | |
1072 | info.si_signo = SIGFPE; | |
1073 | info.si_errno = 0; | |
1074 | info.si_code = __SI_FAULT; | |
65ea5b03 | 1075 | info.si_addr = ip; |
1da177e4 LT |
1076 | /* |
1077 | * The SIMD FPU exceptions are handled a little differently, as there | |
1078 | * is only a single status/control register. Thus, to determine which | |
1079 | * unmasked exception was caught we must mask the exception mask bits | |
1080 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1081 | */ | |
1082 | mxcsr = get_fpu_mxcsr(task); | |
1083 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
a8c1be9d AH |
1084 | case 0x000: |
1085 | default: | |
1086 | break; | |
1087 | case 0x001: /* Invalid Op */ | |
1088 | info.si_code = FPE_FLTINV; | |
1089 | break; | |
1090 | case 0x002: /* Denormalize */ | |
1091 | case 0x010: /* Underflow */ | |
1092 | info.si_code = FPE_FLTUND; | |
1093 | break; | |
1094 | case 0x004: /* Zero Divide */ | |
1095 | info.si_code = FPE_FLTDIV; | |
1096 | break; | |
1097 | case 0x008: /* Overflow */ | |
1098 | info.si_code = FPE_FLTOVF; | |
1099 | break; | |
1100 | case 0x020: /* Precision */ | |
1101 | info.si_code = FPE_FLTRES; | |
1102 | break; | |
1da177e4 LT |
1103 | } |
1104 | force_sig_info(SIGFPE, &info, task); | |
1105 | } | |
1106 | ||
1107 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1108 | { | |
1109 | } | |
1110 | ||
1111 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1112 | { |
1113 | } | |
1114 | ||
1115 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1116 | { |
1117 | } | |
1118 | ||
1119 | /* | |
a8c1be9d | 1120 | * 'math_state_restore()' saves the current math information in the |
1da177e4 LT |
1121 | * old math state array, and gets the new ones from the current task |
1122 | * | |
1123 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1124 | * Don't touch unless you *really* know how it works. | |
1125 | */ | |
1126 | asmlinkage void math_state_restore(void) | |
1127 | { | |
1128 | struct task_struct *me = current; | |
1da177e4 | 1129 | |
aa283f49 SS |
1130 | if (!used_math()) { |
1131 | local_irq_enable(); | |
1132 | /* | |
1133 | * does a slab alloc which can sleep | |
1134 | */ | |
1135 | if (init_fpu(me)) { | |
1136 | /* | |
1137 | * ran out of memory! | |
1138 | */ | |
1139 | do_group_exit(SIGKILL); | |
1140 | return; | |
1141 | } | |
1142 | local_irq_disable(); | |
1143 | } | |
1144 | ||
a8c1be9d | 1145 | clts(); /* Allow maths ops (or we recurse) */ |
61c4628b | 1146 | restore_fpu_checking(&me->thread.xstate->fxsave); |
e4f17c43 | 1147 | task_thread_info(me)->status |= TS_USEDFPU; |
e07e23e1 | 1148 | me->fpu_counter++; |
1da177e4 | 1149 | } |
21db5584 | 1150 | EXPORT_SYMBOL_GPL(math_state_restore); |
1da177e4 | 1151 | |
1da177e4 LT |
1152 | void __init trap_init(void) |
1153 | { | |
a8c1be9d AH |
1154 | set_intr_gate(0, ÷_error); |
1155 | set_intr_gate_ist(1, &debug, DEBUG_STACK); | |
1156 | set_intr_gate_ist(2, &nmi, NMI_STACK); | |
1157 | set_system_gate_ist(3, &int3, DEBUG_STACK); /* int3 can be called from all */ | |
1158 | set_system_gate(4, &overflow); /* int4 can be called from all */ | |
1159 | set_intr_gate(5, &bounds); | |
1160 | set_intr_gate(6, &invalid_op); | |
1161 | set_intr_gate(7, &device_not_available); | |
1162 | set_intr_gate_ist(8, &double_fault, DOUBLEFAULT_STACK); | |
1163 | set_intr_gate(9, &coprocessor_segment_overrun); | |
1164 | set_intr_gate(10, &invalid_TSS); | |
1165 | set_intr_gate(11, &segment_not_present); | |
1166 | set_intr_gate_ist(12, &stack_segment, STACKFAULT_STACK); | |
1167 | set_intr_gate(13, &general_protection); | |
1168 | set_intr_gate(14, &page_fault); | |
1169 | set_intr_gate(15, &spurious_interrupt_bug); | |
1170 | set_intr_gate(16, &coprocessor_error); | |
1171 | set_intr_gate(17, &alignment_check); | |
1da177e4 | 1172 | #ifdef CONFIG_X86_MCE |
a8c1be9d | 1173 | set_intr_gate_ist(18, &machine_check, MCE_STACK); |
1da177e4 | 1174 | #endif |
a8c1be9d | 1175 | set_intr_gate(19, &simd_coprocessor_error); |
1da177e4 LT |
1176 | |
1177 | #ifdef CONFIG_IA32_EMULATION | |
1178 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1179 | #endif | |
61c4628b SS |
1180 | /* |
1181 | * initialize the per thread extended state: | |
1182 | */ | |
7b4fd4bb | 1183 | init_thread_xstate(); |
1da177e4 | 1184 | /* |
a8c1be9d | 1185 | * Should be a barrier for any external CPU state: |
1da177e4 LT |
1186 | */ |
1187 | cpu_init(); | |
1188 | } | |
1189 | ||
2c8c0e6b | 1190 | static int __init oops_setup(char *s) |
a8c1be9d | 1191 | { |
2c8c0e6b AK |
1192 | if (!s) |
1193 | return -EINVAL; | |
1194 | if (!strcmp(s, "panic")) | |
1195 | panic_on_oops = 1; | |
1196 | return 0; | |
a8c1be9d | 1197 | } |
2c8c0e6b | 1198 | early_param("oops", oops_setup); |
1da177e4 LT |
1199 | |
1200 | static int __init kstack_setup(char *s) | |
1201 | { | |
2c8c0e6b AK |
1202 | if (!s) |
1203 | return -EINVAL; | |
a8c1be9d | 1204 | kstack_depth_to_print = simple_strtoul(s, NULL, 0); |
2c8c0e6b | 1205 | return 0; |
1da177e4 | 1206 | } |
2c8c0e6b | 1207 | early_param("kstack", kstack_setup); |
a25bd949 | 1208 | |
a25bd949 AV |
1209 | static int __init code_bytes_setup(char *s) |
1210 | { | |
1211 | code_bytes = simple_strtoul(s, NULL, 0); | |
1212 | if (code_bytes > 8192) | |
1213 | code_bytes = 8192; | |
1214 | ||
1215 | return 1; | |
1216 | } | |
1217 | __setup("code_bytes=", code_bytes_setup); |