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 | */ | |
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 | |
e32ede19 GOC |
36 | #include <mach_traps.h> |
37 | ||
c0d12172 DJ |
38 | #if defined(CONFIG_EDAC) |
39 | #include <linux/edac.h> | |
40 | #endif | |
41 | ||
1da177e4 | 42 | #include <asm/system.h> |
1da177e4 LT |
43 | #include <asm/io.h> |
44 | #include <asm/atomic.h> | |
45 | #include <asm/debugreg.h> | |
46 | #include <asm/desc.h> | |
47 | #include <asm/i387.h> | |
1da177e4 | 48 | #include <asm/processor.h> |
b538ed27 | 49 | #include <asm/unwind.h> |
1da177e4 LT |
50 | #include <asm/smp.h> |
51 | #include <asm/pgalloc.h> | |
52 | #include <asm/pda.h> | |
53 | #include <asm/proto.h> | |
54 | #include <asm/nmi.h> | |
c0b766f1 | 55 | #include <asm/stacktrace.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); | |
74 | asmlinkage void reserved(void); | |
75 | asmlinkage void alignment_check(void); | |
76 | asmlinkage void machine_check(void); | |
77 | asmlinkage void spurious_interrupt_bug(void); | |
1da177e4 | 78 | |
a25bd949 AV |
79 | static unsigned int code_bytes = 64; |
80 | ||
1da177e4 LT |
81 | static inline void conditional_sti(struct pt_regs *regs) |
82 | { | |
65ea5b03 | 83 | if (regs->flags & X86_EFLAGS_IF) |
1da177e4 LT |
84 | local_irq_enable(); |
85 | } | |
86 | ||
a65d17c9 JB |
87 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
88 | { | |
e8bff74a | 89 | inc_preempt_count(); |
65ea5b03 | 90 | if (regs->flags & X86_EFLAGS_IF) |
a65d17c9 JB |
91 | local_irq_enable(); |
92 | } | |
93 | ||
94 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
95 | { | |
65ea5b03 | 96 | if (regs->flags & X86_EFLAGS_IF) |
a65d17c9 | 97 | local_irq_disable(); |
40e59a61 AK |
98 | /* Make sure to not schedule here because we could be running |
99 | on an exception stack. */ | |
e8bff74a | 100 | dec_preempt_count(); |
a65d17c9 JB |
101 | } |
102 | ||
0741f4d2 | 103 | int kstack_depth_to_print = 12; |
1da177e4 | 104 | |
bc850d6b | 105 | void printk_address(unsigned long address, int reliable) |
3ac94932 | 106 | { |
a5ff677c | 107 | #ifdef CONFIG_KALLSYMS |
1da177e4 LT |
108 | unsigned long offset = 0, symsize; |
109 | const char *symname; | |
110 | char *modname; | |
3ac94932 | 111 | char *delim = ":"; |
85e2aeea | 112 | char namebuf[KSYM_NAME_LEN]; |
a5ff677c | 113 | char reliab[4] = ""; |
1da177e4 | 114 | |
3ac94932 IM |
115 | symname = kallsyms_lookup(address, &symsize, &offset, |
116 | &modname, namebuf); | |
117 | if (!symname) { | |
118 | printk(" [<%016lx>]\n", address); | |
119 | return; | |
120 | } | |
bc850d6b AV |
121 | if (!reliable) |
122 | strcpy(reliab, "? "); | |
123 | ||
3ac94932 | 124 | if (!modname) |
a5ff677c | 125 | modname = delim = ""; |
bc850d6b AV |
126 | printk(" [<%016lx>] %s%s%s%s%s+0x%lx/0x%lx\n", |
127 | address, reliab, delim, modname, delim, symname, offset, symsize); | |
1da177e4 | 128 | #else |
3ac94932 | 129 | printk(" [<%016lx>]\n", address); |
1da177e4 | 130 | #endif |
a5ff677c | 131 | } |
1da177e4 | 132 | |
0a658002 | 133 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
c0b766f1 | 134 | unsigned *usedp, char **idp) |
0a658002 | 135 | { |
b556b35e | 136 | static char ids[][8] = { |
0a658002 AK |
137 | [DEBUG_STACK - 1] = "#DB", |
138 | [NMI_STACK - 1] = "NMI", | |
139 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
140 | [STACKFAULT_STACK - 1] = "#SS", | |
141 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
142 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
143 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
144 | #endif | |
0a658002 AK |
145 | }; |
146 | unsigned k; | |
1da177e4 | 147 | |
c9ca1ba5 IM |
148 | /* |
149 | * Iterate over all exception stacks, and figure out whether | |
150 | * 'stack' is in one of them: | |
151 | */ | |
0a658002 | 152 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
f5741644 | 153 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
c9ca1ba5 IM |
154 | /* |
155 | * Is 'stack' above this exception frame's end? | |
156 | * If yes then skip to the next frame. | |
157 | */ | |
0a658002 AK |
158 | if (stack >= end) |
159 | continue; | |
c9ca1ba5 IM |
160 | /* |
161 | * Is 'stack' above this exception frame's start address? | |
162 | * If yes then we found the right frame. | |
163 | */ | |
0a658002 | 164 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
165 | /* |
166 | * Make sure we only iterate through an exception | |
167 | * stack once. If it comes up for the second time | |
168 | * then there's something wrong going on - just | |
169 | * break out and return NULL: | |
170 | */ | |
0a658002 AK |
171 | if (*usedp & (1U << k)) |
172 | break; | |
173 | *usedp |= 1U << k; | |
174 | *idp = ids[k]; | |
175 | return (unsigned long *)end; | |
176 | } | |
c9ca1ba5 IM |
177 | /* |
178 | * If this is a debug stack, and if it has a larger size than | |
179 | * the usual exception stacks, then 'stack' might still | |
180 | * be within the lower portion of the debug stack: | |
181 | */ | |
b556b35e JB |
182 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
183 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
184 | unsigned j = N_EXCEPTION_STACKS - 1; | |
185 | ||
c9ca1ba5 IM |
186 | /* |
187 | * Black magic. A large debug stack is composed of | |
188 | * multiple exception stack entries, which we | |
189 | * iterate through now. Dont look: | |
190 | */ | |
b556b35e JB |
191 | do { |
192 | ++j; | |
193 | end -= EXCEPTION_STKSZ; | |
194 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
195 | } while (stack < end - EXCEPTION_STKSZ); | |
196 | if (*usedp & (1U << j)) | |
197 | break; | |
198 | *usedp |= 1U << j; | |
199 | *idp = ids[j]; | |
200 | return (unsigned long *)end; | |
201 | } | |
202 | #endif | |
1da177e4 LT |
203 | } |
204 | return NULL; | |
0a658002 | 205 | } |
1da177e4 | 206 | |
b615ebda AK |
207 | #define MSG(txt) ops->warning(data, txt) |
208 | ||
1da177e4 | 209 | /* |
676b1855 | 210 | * x86-64 can have up to three kernel stacks: |
1da177e4 LT |
211 | * process stack |
212 | * interrupt stack | |
0a658002 | 213 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
214 | */ |
215 | ||
e4a94568 AV |
216 | static inline int valid_stack_ptr(struct thread_info *tinfo, |
217 | void *p, unsigned int size, void *end) | |
c547c77e | 218 | { |
ade1af77 | 219 | void *t = tinfo; |
e4a94568 AV |
220 | if (end) { |
221 | if (p < end && p >= (end-THREAD_SIZE)) | |
222 | return 1; | |
223 | else | |
224 | return 0; | |
225 | } | |
226 | return p > t && p < t + THREAD_SIZE - size; | |
227 | } | |
228 | ||
80b51f31 AV |
229 | /* The form of the top of the frame on the stack */ |
230 | struct stack_frame { | |
231 | struct stack_frame *next_frame; | |
232 | unsigned long return_address; | |
233 | }; | |
234 | ||
235 | ||
e4a94568 AV |
236 | static inline unsigned long print_context_stack(struct thread_info *tinfo, |
237 | unsigned long *stack, unsigned long bp, | |
238 | const struct stacktrace_ops *ops, void *data, | |
239 | unsigned long *end) | |
240 | { | |
80b51f31 AV |
241 | struct stack_frame *frame = (struct stack_frame *)bp; |
242 | ||
243 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) { | |
244 | unsigned long addr; | |
245 | ||
246 | addr = *stack; | |
e4a94568 | 247 | if (__kernel_text_address(addr)) { |
80b51f31 AV |
248 | if ((unsigned long) stack == bp + 8) { |
249 | ops->address(data, addr, 1); | |
250 | frame = frame->next_frame; | |
251 | bp = (unsigned long) frame; | |
252 | } else { | |
253 | ops->address(data, addr, bp == 0); | |
254 | } | |
e4a94568 | 255 | } |
80b51f31 | 256 | stack++; |
e4a94568 AV |
257 | } |
258 | return bp; | |
c547c77e AK |
259 | } |
260 | ||
b615ebda | 261 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
bc850d6b | 262 | unsigned long *stack, unsigned long bp, |
9689ba8a | 263 | const 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; | |
e4a94568 | 272 | tinfo = task_thread_info(tsk); |
b538ed27 | 273 | |
c0b766f1 AK |
274 | if (!stack) { |
275 | unsigned long dummy; | |
276 | stack = &dummy; | |
277 | if (tsk && tsk != current) | |
faca6227 | 278 | stack = (unsigned long *)tsk->thread.sp; |
b538ed27 JB |
279 | } |
280 | ||
80b51f31 AV |
281 | #ifdef CONFIG_FRAME_POINTER |
282 | if (!bp) { | |
283 | if (tsk == current) { | |
284 | /* Grab bp right from our regs */ | |
285 | asm("movq %%rbp, %0" : "=r" (bp):); | |
286 | } else { | |
287 | /* bp is the last reg pushed by switch_to */ | |
288 | bp = *(unsigned long *) tsk->thread.sp; | |
289 | } | |
290 | } | |
291 | #endif | |
292 | ||
293 | ||
0a658002 | 294 | |
c9ca1ba5 IM |
295 | /* |
296 | * Print function call entries in all stacks, starting at the | |
297 | * current stack address. If the stacks consist of nested | |
298 | * exceptions | |
299 | */ | |
c0b766f1 AK |
300 | for (;;) { |
301 | char *id; | |
0a658002 AK |
302 | unsigned long *estack_end; |
303 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
304 | &used, &id); | |
305 | ||
306 | if (estack_end) { | |
c0b766f1 AK |
307 | if (ops->stack(data, id) < 0) |
308 | break; | |
e4a94568 | 309 | |
80b51f31 AV |
310 | bp = print_context_stack(tinfo, stack, bp, ops, |
311 | data, estack_end); | |
c0b766f1 | 312 | ops->stack(data, "<EOE>"); |
c9ca1ba5 IM |
313 | /* |
314 | * We link to the next stack via the | |
315 | * second-to-last pointer (index -2 to end) in the | |
316 | * exception stack: | |
317 | */ | |
0a658002 AK |
318 | stack = (unsigned long *) estack_end[-2]; |
319 | continue; | |
1da177e4 | 320 | } |
0a658002 AK |
321 | if (irqstack_end) { |
322 | unsigned long *irqstack; | |
323 | irqstack = irqstack_end - | |
324 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
325 | ||
326 | if (stack >= irqstack && stack < irqstack_end) { | |
c0b766f1 AK |
327 | if (ops->stack(data, "IRQ") < 0) |
328 | break; | |
80b51f31 AV |
329 | bp = print_context_stack(tinfo, stack, bp, |
330 | ops, data, irqstack_end); | |
c9ca1ba5 IM |
331 | /* |
332 | * We link to the next stack (which would be | |
333 | * the process stack normally) the last | |
334 | * pointer (index -1 to end) in the IRQ stack: | |
335 | */ | |
0a658002 AK |
336 | stack = (unsigned long *) (irqstack_end[-1]); |
337 | irqstack_end = NULL; | |
c0b766f1 | 338 | ops->stack(data, "EOI"); |
0a658002 | 339 | continue; |
1da177e4 | 340 | } |
1da177e4 | 341 | } |
0a658002 | 342 | break; |
1da177e4 | 343 | } |
0a658002 | 344 | |
c9ca1ba5 | 345 | /* |
c0b766f1 | 346 | * This handles the process stack: |
c9ca1ba5 | 347 | */ |
80b51f31 | 348 | bp = print_context_stack(tinfo, stack, bp, ops, data, NULL); |
da68933e | 349 | put_cpu(); |
c0b766f1 AK |
350 | } |
351 | EXPORT_SYMBOL(dump_trace); | |
352 | ||
353 | static void | |
354 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
355 | { | |
356 | print_symbol(msg, symbol); | |
357 | printk("\n"); | |
358 | } | |
359 | ||
360 | static void print_trace_warning(void *data, char *msg) | |
361 | { | |
362 | printk("%s\n", msg); | |
363 | } | |
364 | ||
365 | static int print_trace_stack(void *data, char *name) | |
366 | { | |
367 | printk(" <%s> ", name); | |
368 | return 0; | |
369 | } | |
3ac94932 | 370 | |
bc850d6b | 371 | static void print_trace_address(void *data, unsigned long addr, int reliable) |
c0b766f1 | 372 | { |
1c978b93 | 373 | touch_nmi_watchdog(); |
bc850d6b | 374 | printk_address(addr, reliable); |
c0b766f1 AK |
375 | } |
376 | ||
9689ba8a | 377 | static const struct stacktrace_ops print_trace_ops = { |
c0b766f1 AK |
378 | .warning = print_trace_warning, |
379 | .warning_symbol = print_trace_warning_symbol, | |
380 | .stack = print_trace_stack, | |
381 | .address = print_trace_address, | |
382 | }; | |
383 | ||
384 | void | |
bc850d6b AV |
385 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack, |
386 | unsigned long bp) | |
c0b766f1 AK |
387 | { |
388 | printk("\nCall Trace:\n"); | |
bc850d6b | 389 | dump_trace(tsk, regs, stack, bp, &print_trace_ops, NULL); |
1da177e4 LT |
390 | printk("\n"); |
391 | } | |
392 | ||
c0b766f1 | 393 | static void |
bc850d6b AV |
394 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *sp, |
395 | unsigned long bp) | |
1da177e4 LT |
396 | { |
397 | unsigned long *stack; | |
398 | int i; | |
151f8cc1 | 399 | const int cpu = smp_processor_id(); |
df79efde RT |
400 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
401 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
402 | |
403 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
404 | // back trace for this cpu. | |
405 | ||
65ea5b03 | 406 | if (sp == NULL) { |
1da177e4 | 407 | if (tsk) |
faca6227 | 408 | sp = (unsigned long *)tsk->thread.sp; |
1da177e4 | 409 | else |
65ea5b03 | 410 | sp = (unsigned long *)&sp; |
1da177e4 LT |
411 | } |
412 | ||
65ea5b03 | 413 | stack = sp; |
1da177e4 LT |
414 | for(i=0; i < kstack_depth_to_print; i++) { |
415 | if (stack >= irqstack && stack <= irqstack_end) { | |
416 | if (stack == irqstack_end) { | |
417 | stack = (unsigned long *) (irqstack_end[-1]); | |
418 | printk(" <EOI> "); | |
419 | } | |
420 | } else { | |
421 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
422 | break; | |
423 | } | |
424 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
425 | printk("\n"); |
426 | printk(" %016lx", *stack++); | |
35faa714 | 427 | touch_nmi_watchdog(); |
1da177e4 | 428 | } |
bc850d6b | 429 | show_trace(tsk, regs, sp, bp); |
b538ed27 JB |
430 | } |
431 | ||
65ea5b03 | 432 | void show_stack(struct task_struct *tsk, unsigned long * sp) |
b538ed27 | 433 | { |
bc850d6b | 434 | _show_stack(tsk, NULL, sp, 0); |
1da177e4 LT |
435 | } |
436 | ||
437 | /* | |
438 | * The architecture-independent dump_stack generator | |
439 | */ | |
440 | void dump_stack(void) | |
441 | { | |
442 | unsigned long dummy; | |
bc850d6b | 443 | unsigned long bp = 0; |
57c351de | 444 | |
80b51f31 AV |
445 | #ifdef CONFIG_FRAME_POINTER |
446 | if (!bp) | |
447 | asm("movq %%rbp, %0" : "=r" (bp):); | |
448 | #endif | |
449 | ||
57c351de AV |
450 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", |
451 | current->pid, current->comm, print_tainted(), | |
452 | init_utsname()->release, | |
453 | (int)strcspn(init_utsname()->version, " "), | |
454 | init_utsname()->version); | |
bc850d6b | 455 | show_trace(NULL, NULL, &dummy, bp); |
1da177e4 LT |
456 | } |
457 | ||
458 | EXPORT_SYMBOL(dump_stack); | |
459 | ||
460 | void show_registers(struct pt_regs *regs) | |
461 | { | |
462 | int i; | |
65ea5b03 | 463 | unsigned long sp; |
151f8cc1 | 464 | const int cpu = smp_processor_id(); |
df79efde | 465 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
a25bd949 AV |
466 | u8 *ip; |
467 | unsigned int code_prologue = code_bytes * 43 / 64; | |
468 | unsigned int code_len = code_bytes; | |
1da177e4 | 469 | |
65ea5b03 | 470 | sp = regs->sp; |
a25bd949 | 471 | ip = (u8 *) regs->ip - code_prologue; |
1da177e4 LT |
472 | printk("CPU %d ", cpu); |
473 | __show_regs(regs); | |
474 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 475 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
476 | |
477 | /* | |
478 | * When in-kernel, we also print out the stack and code at the | |
479 | * time of the fault.. | |
480 | */ | |
a25bd949 AV |
481 | if (!user_mode(regs)) { |
482 | unsigned char c; | |
1da177e4 | 483 | printk("Stack: "); |
bc850d6b | 484 | _show_stack(NULL, regs, (unsigned long *)sp, regs->bp); |
a25bd949 | 485 | printk("\n"); |
1da177e4 | 486 | |
a25bd949 AV |
487 | printk(KERN_EMERG "Code: "); |
488 | if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { | |
489 | /* try starting at RIP */ | |
490 | ip = (u8 *) regs->ip; | |
491 | code_len = code_len - code_prologue + 1; | |
492 | } | |
493 | for (i = 0; i < code_len; i++, ip++) { | |
494 | if (ip < (u8 *)PAGE_OFFSET || | |
495 | probe_kernel_address(ip, c)) { | |
1da177e4 LT |
496 | printk(" Bad RIP value."); |
497 | break; | |
498 | } | |
a25bd949 AV |
499 | if (ip == (u8 *)regs->ip) |
500 | printk("<%02x> ", c); | |
501 | else | |
502 | printk("%02x ", c); | |
1da177e4 LT |
503 | } |
504 | } | |
505 | printk("\n"); | |
506 | } | |
507 | ||
65ea5b03 | 508 | int is_valid_bugaddr(unsigned long ip) |
c31a0bf3 JF |
509 | { |
510 | unsigned short ud2; | |
511 | ||
65ea5b03 | 512 | if (__copy_from_user(&ud2, (const void __user *) ip, sizeof(ud2))) |
c31a0bf3 JF |
513 | return 0; |
514 | ||
515 | return ud2 == 0x0b0f; | |
516 | } | |
1da177e4 | 517 | |
39743c9e | 518 | static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; |
1da177e4 | 519 | static int die_owner = -1; |
cdc60a4c | 520 | static unsigned int die_nest_count; |
1da177e4 | 521 | |
eddb6fb9 | 522 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 523 | { |
b39b7036 | 524 | int cpu; |
1209140c JB |
525 | unsigned long flags; |
526 | ||
abf0f109 AM |
527 | oops_enter(); |
528 | ||
1209140c | 529 | /* racy, but better than risking deadlock. */ |
39743c9e | 530 | raw_local_irq_save(flags); |
b39b7036 | 531 | cpu = smp_processor_id(); |
39743c9e | 532 | if (!__raw_spin_trylock(&die_lock)) { |
1da177e4 LT |
533 | if (cpu == die_owner) |
534 | /* nested oops. should stop eventually */; | |
535 | else | |
39743c9e | 536 | __raw_spin_lock(&die_lock); |
1da177e4 | 537 | } |
cdc60a4c | 538 | die_nest_count++; |
1209140c | 539 | die_owner = cpu; |
1da177e4 | 540 | console_verbose(); |
1209140c JB |
541 | bust_spinlocks(1); |
542 | return flags; | |
1da177e4 LT |
543 | } |
544 | ||
22f5991c | 545 | void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr) |
1da177e4 LT |
546 | { |
547 | die_owner = -1; | |
1209140c | 548 | bust_spinlocks(0); |
cdc60a4c | 549 | die_nest_count--; |
39743c9e | 550 | if (!die_nest_count) |
cdc60a4c | 551 | /* Nest count reaches zero, release the lock. */ |
39743c9e AK |
552 | __raw_spin_unlock(&die_lock); |
553 | raw_local_irq_restore(flags); | |
22f5991c JB |
554 | if (!regs) { |
555 | oops_exit(); | |
556 | return; | |
557 | } | |
1da177e4 | 558 | if (panic_on_oops) |
012c437d | 559 | panic("Fatal exception"); |
abf0f109 | 560 | oops_exit(); |
22f5991c | 561 | do_exit(signr); |
1209140c | 562 | } |
1da177e4 | 563 | |
22f5991c | 564 | int __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
565 | { |
566 | static int die_counter; | |
567 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
568 | #ifdef CONFIG_PREEMPT | |
569 | printk("PREEMPT "); | |
570 | #endif | |
571 | #ifdef CONFIG_SMP | |
572 | printk("SMP "); | |
573 | #endif | |
574 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
575 | printk("DEBUG_PAGEALLOC"); | |
576 | #endif | |
577 | printk("\n"); | |
22f5991c JB |
578 | if (notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP) |
579 | return 1; | |
1da177e4 | 580 | show_registers(regs); |
bcdcd8e7 | 581 | add_taint(TAINT_DIE); |
1da177e4 LT |
582 | /* Executive summary in case the oops scrolled away */ |
583 | printk(KERN_ALERT "RIP "); | |
aafbd7eb | 584 | printk_address(regs->ip, 1); |
65ea5b03 | 585 | printk(" RSP <%016lx>\n", regs->sp); |
8bcc5280 VG |
586 | if (kexec_should_crash(current)) |
587 | crash_kexec(regs); | |
22f5991c | 588 | return 0; |
1da177e4 LT |
589 | } |
590 | ||
591 | void die(const char * str, struct pt_regs * regs, long err) | |
592 | { | |
1209140c JB |
593 | unsigned long flags = oops_begin(); |
594 | ||
c31a0bf3 | 595 | if (!user_mode(regs)) |
65ea5b03 | 596 | report_bug(regs->ip, regs); |
c31a0bf3 | 597 | |
22f5991c JB |
598 | if (__die(str, regs, err)) |
599 | regs = NULL; | |
600 | oops_end(flags, regs, SIGSEGV); | |
1da177e4 | 601 | } |
1da177e4 | 602 | |
fac58550 | 603 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
1da177e4 | 604 | { |
737a460f | 605 | unsigned long flags; |
1209140c | 606 | |
737a460f JW |
607 | if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == |
608 | NOTIFY_STOP) | |
609 | return; | |
1209140c | 610 | |
737a460f | 611 | flags = oops_begin(); |
1da177e4 LT |
612 | /* |
613 | * We are in trouble anyway, lets at least try | |
614 | * to get a message out. | |
615 | */ | |
151f8cc1 | 616 | printk(str, smp_processor_id()); |
1da177e4 | 617 | show_registers(regs); |
8bcc5280 VG |
618 | if (kexec_should_crash(current)) |
619 | crash_kexec(regs); | |
fac58550 AK |
620 | if (do_panic || panic_on_oops) |
621 | panic("Non maskable interrupt"); | |
22f5991c | 622 | oops_end(flags, NULL, SIGBUS); |
8b1ffe95 CM |
623 | nmi_exit(); |
624 | local_irq_enable(); | |
22f5991c | 625 | do_exit(SIGBUS); |
1da177e4 LT |
626 | } |
627 | ||
0f2fbdcb PP |
628 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
629 | struct pt_regs * regs, long error_code, | |
630 | siginfo_t *info) | |
1da177e4 | 631 | { |
6e3f3617 JB |
632 | struct task_struct *tsk = current; |
633 | ||
6e3f3617 | 634 | if (user_mode(regs)) { |
d1895183 AK |
635 | /* |
636 | * We want error_code and trap_no set for userspace | |
637 | * faults and kernelspace faults which result in | |
638 | * die(), but not kernelspace faults which are fixed | |
639 | * up. die() gives the process no chance to handle | |
640 | * the signal and notice the kernel fault information, | |
641 | * so that won't result in polluting the information | |
642 | * about previously queued, but not yet delivered, | |
643 | * faults. See also do_general_protection below. | |
644 | */ | |
645 | tsk->thread.error_code = error_code; | |
646 | tsk->thread.trap_no = trapnr; | |
647 | ||
abd4f750 | 648 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
03252919 | 649 | printk_ratelimit()) { |
1da177e4 | 650 | printk(KERN_INFO |
03252919 | 651 | "%s[%d] trap %s ip:%lx sp:%lx error:%lx", |
1da177e4 | 652 | tsk->comm, tsk->pid, str, |
65ea5b03 | 653 | regs->ip, regs->sp, error_code); |
03252919 AK |
654 | print_vma_addr(" in ", regs->ip); |
655 | printk("\n"); | |
656 | } | |
1da177e4 | 657 | |
1da177e4 LT |
658 | if (info) |
659 | force_sig_info(signr, info, tsk); | |
660 | else | |
661 | force_sig(signr, tsk); | |
662 | return; | |
663 | } | |
664 | ||
665 | ||
b3a5acc1 HH |
666 | if (!fixup_exception(regs)) { |
667 | tsk->thread.error_code = error_code; | |
668 | tsk->thread.trap_no = trapnr; | |
669 | die(str, regs, error_code); | |
1da177e4 | 670 | } |
b3a5acc1 | 671 | return; |
1da177e4 LT |
672 | } |
673 | ||
674 | #define DO_ERROR(trapnr, signr, str, name) \ | |
675 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
676 | { \ | |
677 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
678 | == NOTIFY_STOP) \ | |
679 | return; \ | |
40e59a61 | 680 | conditional_sti(regs); \ |
1da177e4 LT |
681 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
682 | } | |
683 | ||
684 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
685 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
686 | { \ | |
687 | siginfo_t info; \ | |
688 | info.si_signo = signr; \ | |
689 | info.si_errno = 0; \ | |
690 | info.si_code = sicode; \ | |
691 | info.si_addr = (void __user *)siaddr; \ | |
fb1dac90 | 692 | trace_hardirqs_fixup(); \ |
1da177e4 LT |
693 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
694 | == NOTIFY_STOP) \ | |
695 | return; \ | |
40e59a61 | 696 | conditional_sti(regs); \ |
1da177e4 LT |
697 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
698 | } | |
699 | ||
65ea5b03 | 700 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
1da177e4 LT |
701 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) |
702 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
65ea5b03 | 703 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip) |
1da177e4 LT |
704 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
705 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
706 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
707 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
708 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
709 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
710 | |
711 | /* Runs on IST stack */ | |
712 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
713 | { | |
714 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
715 | 12, SIGBUS) == NOTIFY_STOP) | |
716 | return; | |
717 | preempt_conditional_sti(regs); | |
718 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
719 | preempt_conditional_cli(regs); | |
720 | } | |
eca37c18 JB |
721 | |
722 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
723 | { | |
724 | static const char str[] = "double fault"; | |
725 | struct task_struct *tsk = current; | |
726 | ||
727 | /* Return not checked because double check cannot be ignored */ | |
728 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
729 | ||
730 | tsk->thread.error_code = error_code; | |
731 | tsk->thread.trap_no = 8; | |
732 | ||
733 | /* This is always a kernel trap and never fixable (and thus must | |
734 | never return). */ | |
735 | for (;;) | |
736 | die(str, regs, error_code); | |
737 | } | |
1da177e4 | 738 | |
0f2fbdcb PP |
739 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
740 | long error_code) | |
1da177e4 | 741 | { |
6e3f3617 JB |
742 | struct task_struct *tsk = current; |
743 | ||
1da177e4 LT |
744 | conditional_sti(regs); |
745 | ||
6e3f3617 | 746 | if (user_mode(regs)) { |
d1895183 AK |
747 | tsk->thread.error_code = error_code; |
748 | tsk->thread.trap_no = 13; | |
749 | ||
abd4f750 | 750 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
03252919 | 751 | printk_ratelimit()) { |
1da177e4 | 752 | printk(KERN_INFO |
03252919 | 753 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", |
1da177e4 | 754 | tsk->comm, tsk->pid, |
65ea5b03 | 755 | regs->ip, regs->sp, error_code); |
03252919 AK |
756 | print_vma_addr(" in ", regs->ip); |
757 | printk("\n"); | |
758 | } | |
1da177e4 | 759 | |
1da177e4 LT |
760 | force_sig(SIGSEGV, tsk); |
761 | return; | |
762 | } | |
763 | ||
b3a5acc1 HH |
764 | if (fixup_exception(regs)) |
765 | return; | |
d1895183 | 766 | |
b3a5acc1 HH |
767 | tsk->thread.error_code = error_code; |
768 | tsk->thread.trap_no = 13; | |
769 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
770 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
771 | return; | |
772 | die("general protection fault", regs, error_code); | |
1da177e4 LT |
773 | } |
774 | ||
eddb6fb9 AK |
775 | static __kprobes void |
776 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 | 777 | { |
c41c5cd3 DZ |
778 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
779 | reason); | |
9c5f8be4 | 780 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
c41c5cd3 | 781 | |
c0d12172 DJ |
782 | #if defined(CONFIG_EDAC) |
783 | if(edac_handler_set()) { | |
784 | edac_atomic_assert_error(); | |
785 | return; | |
786 | } | |
787 | #endif | |
788 | ||
8da5adda | 789 | if (panic_on_unrecovered_nmi) |
c41c5cd3 DZ |
790 | panic("NMI: Not continuing"); |
791 | ||
792 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); | |
1da177e4 LT |
793 | |
794 | /* Clear and disable the memory parity error line. */ | |
795 | reason = (reason & 0xf) | 4; | |
796 | outb(reason, 0x61); | |
797 | } | |
798 | ||
eddb6fb9 AK |
799 | static __kprobes void |
800 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
801 | { |
802 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
803 | show_registers(regs); | |
804 | ||
805 | /* Re-enable the IOCK line, wait for a few seconds */ | |
806 | reason = (reason & 0xf) | 8; | |
807 | outb(reason, 0x61); | |
808 | mdelay(2000); | |
809 | reason &= ~8; | |
810 | outb(reason, 0x61); | |
811 | } | |
812 | ||
eddb6fb9 AK |
813 | static __kprobes void |
814 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
c41c5cd3 | 815 | { |
d3597524 JW |
816 | if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
817 | return; | |
c41c5cd3 DZ |
818 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
819 | reason); | |
820 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); | |
8da5adda DZ |
821 | |
822 | if (panic_on_unrecovered_nmi) | |
c41c5cd3 | 823 | panic("NMI: Not continuing"); |
8da5adda | 824 | |
c41c5cd3 | 825 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
1da177e4 LT |
826 | } |
827 | ||
6fefb0d1 AK |
828 | /* Runs on IST stack. This code must keep interrupts off all the time. |
829 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 830 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
831 | { |
832 | unsigned char reason = 0; | |
76e4f660 AR |
833 | int cpu; |
834 | ||
835 | cpu = smp_processor_id(); | |
1da177e4 LT |
836 | |
837 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 838 | if (!cpu) |
1da177e4 LT |
839 | reason = get_nmi_reason(); |
840 | ||
841 | if (!(reason & 0xc0)) { | |
6e3f3617 | 842 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
843 | == NOTIFY_STOP) |
844 | return; | |
1da177e4 LT |
845 | /* |
846 | * Ok, so this is none of the documented NMI sources, | |
847 | * so it must be the NMI watchdog. | |
848 | */ | |
3adbbcce | 849 | if (nmi_watchdog_tick(regs,reason)) |
1da177e4 | 850 | return; |
3adbbcce | 851 | if (!do_nmi_callback(regs,cpu)) |
3adbbcce DZ |
852 | unknown_nmi_error(reason, regs); |
853 | ||
1da177e4 LT |
854 | return; |
855 | } | |
6e3f3617 | 856 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
857 | return; |
858 | ||
859 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
860 | ||
861 | if (reason & 0x80) | |
862 | mem_parity_error(reason, regs); | |
863 | if (reason & 0x40) | |
864 | io_check_error(reason, regs); | |
865 | } | |
866 | ||
b556b35e | 867 | /* runs on IST stack. */ |
0f2fbdcb | 868 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 | 869 | { |
143a5d32 PZ |
870 | trace_hardirqs_fixup(); |
871 | ||
1da177e4 LT |
872 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { |
873 | return; | |
874 | } | |
40e59a61 | 875 | preempt_conditional_sti(regs); |
1da177e4 | 876 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 877 | preempt_conditional_cli(regs); |
1da177e4 LT |
878 | } |
879 | ||
6fefb0d1 AK |
880 | /* Help handler running on IST stack to switch back to user stack |
881 | for scheduling or signal handling. The actual stack switch is done in | |
882 | entry.S */ | |
eddb6fb9 | 883 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
884 | { |
885 | struct pt_regs *regs = eregs; | |
886 | /* Did already sync */ | |
65ea5b03 | 887 | if (eregs == (struct pt_regs *)eregs->sp) |
6fefb0d1 AK |
888 | ; |
889 | /* Exception from user space */ | |
76381fee | 890 | else if (user_mode(eregs)) |
bb049232 | 891 | regs = task_pt_regs(current); |
6fefb0d1 AK |
892 | /* Exception from kernel and interrupts are enabled. Move to |
893 | kernel process stack. */ | |
65ea5b03 PA |
894 | else if (eregs->flags & X86_EFLAGS_IF) |
895 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); | |
6fefb0d1 AK |
896 | if (eregs != regs) |
897 | *regs = *eregs; | |
898 | return regs; | |
899 | } | |
900 | ||
1da177e4 | 901 | /* runs on IST stack. */ |
0f2fbdcb PP |
902 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
903 | unsigned long error_code) | |
1da177e4 | 904 | { |
1da177e4 LT |
905 | unsigned long condition; |
906 | struct task_struct *tsk = current; | |
907 | siginfo_t info; | |
908 | ||
000f4a9e PZ |
909 | trace_hardirqs_fixup(); |
910 | ||
e9129e56 | 911 | get_debugreg(condition, 6); |
1da177e4 | 912 | |
10faa81e RM |
913 | /* |
914 | * The processor cleared BTF, so don't mark that we need it set. | |
915 | */ | |
916 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); | |
917 | tsk->thread.debugctlmsr = 0; | |
918 | ||
1da177e4 | 919 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
daeeafec | 920 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 921 | return; |
daeeafec | 922 | |
a65d17c9 | 923 | preempt_conditional_sti(regs); |
1da177e4 LT |
924 | |
925 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
926 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
927 | if (!tsk->thread.debugreg7) { | |
928 | goto clear_dr7; | |
929 | } | |
930 | } | |
931 | ||
932 | tsk->thread.debugreg6 = condition; | |
933 | ||
e1f28773 RM |
934 | |
935 | /* | |
936 | * Single-stepping through TF: make sure we ignore any events in | |
937 | * kernel space (but re-enable TF when returning to user mode). | |
938 | */ | |
daeeafec | 939 | if (condition & DR_STEP) { |
76381fee | 940 | if (!user_mode(regs)) |
1da177e4 | 941 | goto clear_TF_reenable; |
1da177e4 LT |
942 | } |
943 | ||
944 | /* Ok, finally something we can handle */ | |
945 | tsk->thread.trap_no = 1; | |
946 | tsk->thread.error_code = error_code; | |
947 | info.si_signo = SIGTRAP; | |
948 | info.si_errno = 0; | |
949 | info.si_code = TRAP_BRKPT; | |
65ea5b03 | 950 | info.si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL; |
01b8faae | 951 | force_sig_info(SIGTRAP, &info, tsk); |
1da177e4 | 952 | |
1da177e4 | 953 | clear_dr7: |
e9129e56 | 954 | set_debugreg(0UL, 7); |
a65d17c9 | 955 | preempt_conditional_cli(regs); |
6fefb0d1 | 956 | return; |
1da177e4 LT |
957 | |
958 | clear_TF_reenable: | |
959 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
053de044 | 960 | regs->flags &= ~X86_EFLAGS_TF; |
a65d17c9 | 961 | preempt_conditional_cli(regs); |
1da177e4 LT |
962 | } |
963 | ||
6e3f3617 | 964 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 | 965 | { |
b3a5acc1 | 966 | if (fixup_exception(regs)) |
1da177e4 | 967 | return 1; |
b3a5acc1 | 968 | |
6e3f3617 | 969 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 970 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 971 | current->thread.trap_no = trapnr; |
1da177e4 | 972 | die(str, regs, 0); |
1da177e4 LT |
973 | return 0; |
974 | } | |
975 | ||
976 | /* | |
977 | * Note that we play around with the 'TS' bit in an attempt to get | |
978 | * the correct behaviour even in the presence of the asynchronous | |
979 | * IRQ13 behaviour | |
980 | */ | |
981 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
982 | { | |
65ea5b03 | 983 | void __user *ip = (void __user *)(regs->ip); |
1da177e4 LT |
984 | struct task_struct * task; |
985 | siginfo_t info; | |
986 | unsigned short cwd, swd; | |
987 | ||
988 | conditional_sti(regs); | |
76381fee | 989 | if (!user_mode(regs) && |
6e3f3617 | 990 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
991 | return; |
992 | ||
993 | /* | |
994 | * Save the info for the exception handler and clear the error. | |
995 | */ | |
996 | task = current; | |
997 | save_init_fpu(task); | |
998 | task->thread.trap_no = 16; | |
999 | task->thread.error_code = 0; | |
1000 | info.si_signo = SIGFPE; | |
1001 | info.si_errno = 0; | |
1002 | info.si_code = __SI_FAULT; | |
65ea5b03 | 1003 | info.si_addr = ip; |
1da177e4 LT |
1004 | /* |
1005 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
1006 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
1007 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
1008 | * fault bit. We should only be taking one exception at a time, | |
1009 | * so if this combination doesn't produce any single exception, | |
1010 | * then we have a bad program that isn't synchronizing its FPU usage | |
1011 | * and it will suffer the consequences since we won't be able to | |
1012 | * fully reproduce the context of the exception | |
1013 | */ | |
1014 | cwd = get_fpu_cwd(task); | |
1015 | swd = get_fpu_swd(task); | |
ff347b22 | 1016 | switch (swd & ~cwd & 0x3f) { |
1da177e4 LT |
1017 | case 0x000: |
1018 | default: | |
1019 | break; | |
1020 | case 0x001: /* Invalid Op */ | |
ff347b22 CE |
1021 | /* |
1022 | * swd & 0x240 == 0x040: Stack Underflow | |
1023 | * swd & 0x240 == 0x240: Stack Overflow | |
1024 | * User must clear the SF bit (0x40) if set | |
1025 | */ | |
1da177e4 LT |
1026 | info.si_code = FPE_FLTINV; |
1027 | break; | |
1028 | case 0x002: /* Denormalize */ | |
1029 | case 0x010: /* Underflow */ | |
1030 | info.si_code = FPE_FLTUND; | |
1031 | break; | |
1032 | case 0x004: /* Zero Divide */ | |
1033 | info.si_code = FPE_FLTDIV; | |
1034 | break; | |
1035 | case 0x008: /* Overflow */ | |
1036 | info.si_code = FPE_FLTOVF; | |
1037 | break; | |
1038 | case 0x020: /* Precision */ | |
1039 | info.si_code = FPE_FLTRES; | |
1040 | break; | |
1041 | } | |
1042 | force_sig_info(SIGFPE, &info, task); | |
1043 | } | |
1044 | ||
1045 | asmlinkage void bad_intr(void) | |
1046 | { | |
1047 | printk("bad interrupt"); | |
1048 | } | |
1049 | ||
1050 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
1051 | { | |
65ea5b03 | 1052 | void __user *ip = (void __user *)(regs->ip); |
1da177e4 LT |
1053 | struct task_struct * task; |
1054 | siginfo_t info; | |
1055 | unsigned short mxcsr; | |
1056 | ||
1057 | conditional_sti(regs); | |
76381fee | 1058 | if (!user_mode(regs) && |
6e3f3617 | 1059 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
1060 | return; |
1061 | ||
1062 | /* | |
1063 | * Save the info for the exception handler and clear the error. | |
1064 | */ | |
1065 | task = current; | |
1066 | save_init_fpu(task); | |
1067 | task->thread.trap_no = 19; | |
1068 | task->thread.error_code = 0; | |
1069 | info.si_signo = SIGFPE; | |
1070 | info.si_errno = 0; | |
1071 | info.si_code = __SI_FAULT; | |
65ea5b03 | 1072 | info.si_addr = ip; |
1da177e4 LT |
1073 | /* |
1074 | * The SIMD FPU exceptions are handled a little differently, as there | |
1075 | * is only a single status/control register. Thus, to determine which | |
1076 | * unmasked exception was caught we must mask the exception mask bits | |
1077 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1078 | */ | |
1079 | mxcsr = get_fpu_mxcsr(task); | |
1080 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
1081 | case 0x000: | |
1082 | default: | |
1083 | break; | |
1084 | case 0x001: /* Invalid Op */ | |
1085 | info.si_code = FPE_FLTINV; | |
1086 | break; | |
1087 | case 0x002: /* Denormalize */ | |
1088 | case 0x010: /* Underflow */ | |
1089 | info.si_code = FPE_FLTUND; | |
1090 | break; | |
1091 | case 0x004: /* Zero Divide */ | |
1092 | info.si_code = FPE_FLTDIV; | |
1093 | break; | |
1094 | case 0x008: /* Overflow */ | |
1095 | info.si_code = FPE_FLTOVF; | |
1096 | break; | |
1097 | case 0x020: /* Precision */ | |
1098 | info.si_code = FPE_FLTRES; | |
1099 | break; | |
1100 | } | |
1101 | force_sig_info(SIGFPE, &info, task); | |
1102 | } | |
1103 | ||
1104 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1105 | { | |
1106 | } | |
1107 | ||
1108 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1109 | { |
1110 | } | |
1111 | ||
1112 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1113 | { |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * 'math_state_restore()' saves the current math information in the | |
1118 | * old math state array, and gets the new ones from the current task | |
1119 | * | |
1120 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1121 | * Don't touch unless you *really* know how it works. | |
1122 | */ | |
1123 | asmlinkage void math_state_restore(void) | |
1124 | { | |
1125 | struct task_struct *me = current; | |
1126 | clts(); /* Allow maths ops (or we recurse) */ | |
1127 | ||
1128 | if (!used_math()) | |
1129 | init_fpu(me); | |
1130 | restore_fpu_checking(&me->thread.i387.fxsave); | |
e4f17c43 | 1131 | task_thread_info(me)->status |= TS_USEDFPU; |
e07e23e1 | 1132 | me->fpu_counter++; |
1da177e4 | 1133 | } |
21db5584 | 1134 | EXPORT_SYMBOL_GPL(math_state_restore); |
1da177e4 | 1135 | |
1da177e4 LT |
1136 | void __init trap_init(void) |
1137 | { | |
1138 | set_intr_gate(0,÷_error); | |
1139 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1140 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1141 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1142 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1143 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1144 | set_intr_gate(6,&invalid_op); |
1145 | set_intr_gate(7,&device_not_available); | |
1146 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1147 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1148 | set_intr_gate(10,&invalid_TSS); | |
1149 | set_intr_gate(11,&segment_not_present); | |
1150 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1151 | set_intr_gate(13,&general_protection); | |
1152 | set_intr_gate(14,&page_fault); | |
1153 | set_intr_gate(15,&spurious_interrupt_bug); | |
1154 | set_intr_gate(16,&coprocessor_error); | |
1155 | set_intr_gate(17,&alignment_check); | |
1156 | #ifdef CONFIG_X86_MCE | |
1157 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1158 | #endif | |
1159 | set_intr_gate(19,&simd_coprocessor_error); | |
1160 | ||
1161 | #ifdef CONFIG_IA32_EMULATION | |
1162 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1163 | #endif | |
1164 | ||
1da177e4 LT |
1165 | /* |
1166 | * Should be a barrier for any external CPU state. | |
1167 | */ | |
1168 | cpu_init(); | |
1169 | } | |
1170 | ||
1171 | ||
2c8c0e6b | 1172 | static int __init oops_setup(char *s) |
1da177e4 | 1173 | { |
2c8c0e6b AK |
1174 | if (!s) |
1175 | return -EINVAL; | |
1176 | if (!strcmp(s, "panic")) | |
1177 | panic_on_oops = 1; | |
1178 | return 0; | |
1da177e4 | 1179 | } |
2c8c0e6b | 1180 | early_param("oops", oops_setup); |
1da177e4 LT |
1181 | |
1182 | static int __init kstack_setup(char *s) | |
1183 | { | |
2c8c0e6b AK |
1184 | if (!s) |
1185 | return -EINVAL; | |
1da177e4 | 1186 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
2c8c0e6b | 1187 | return 0; |
1da177e4 | 1188 | } |
2c8c0e6b | 1189 | early_param("kstack", kstack_setup); |
a25bd949 AV |
1190 | |
1191 | ||
1192 | static int __init code_bytes_setup(char *s) | |
1193 | { | |
1194 | code_bytes = simple_strtoul(s, NULL, 0); | |
1195 | if (code_bytes > 8192) | |
1196 | code_bytes = 8192; | |
1197 | ||
1198 | return 1; | |
1199 | } | |
1200 | __setup("code_bytes=", code_bytes_setup); |