Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/x86-64/traps.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs | |
6 | * | |
7 | * Pentium III FXSR, SSE support | |
8 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
1da177e4 LT |
9 | */ |
10 | ||
11 | /* | |
12 | * 'Traps.c' handles hardware traps and faults after we have saved some | |
13 | * state in 'entry.S'. | |
14 | */ | |
1da177e4 LT |
15 | #include <linux/sched.h> |
16 | #include <linux/kernel.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/timer.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/moduleparam.h> | |
35faa714 | 28 | #include <linux/nmi.h> |
0f2fbdcb | 29 | #include <linux/kprobes.h> |
8bcc5280 | 30 | #include <linux/kexec.h> |
b538ed27 | 31 | #include <linux/unwind.h> |
1da177e4 LT |
32 | |
33 | #include <asm/system.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/io.h> | |
36 | #include <asm/atomic.h> | |
37 | #include <asm/debugreg.h> | |
38 | #include <asm/desc.h> | |
39 | #include <asm/i387.h> | |
40 | #include <asm/kdebug.h> | |
41 | #include <asm/processor.h> | |
b538ed27 | 42 | #include <asm/unwind.h> |
1da177e4 LT |
43 | #include <asm/smp.h> |
44 | #include <asm/pgalloc.h> | |
45 | #include <asm/pda.h> | |
46 | #include <asm/proto.h> | |
47 | #include <asm/nmi.h> | |
48 | ||
1da177e4 LT |
49 | asmlinkage void divide_error(void); |
50 | asmlinkage void debug(void); | |
51 | asmlinkage void nmi(void); | |
52 | asmlinkage void int3(void); | |
53 | asmlinkage void overflow(void); | |
54 | asmlinkage void bounds(void); | |
55 | asmlinkage void invalid_op(void); | |
56 | asmlinkage void device_not_available(void); | |
57 | asmlinkage void double_fault(void); | |
58 | asmlinkage void coprocessor_segment_overrun(void); | |
59 | asmlinkage void invalid_TSS(void); | |
60 | asmlinkage void segment_not_present(void); | |
61 | asmlinkage void stack_segment(void); | |
62 | asmlinkage void general_protection(void); | |
63 | asmlinkage void page_fault(void); | |
64 | asmlinkage void coprocessor_error(void); | |
65 | asmlinkage void simd_coprocessor_error(void); | |
66 | asmlinkage void reserved(void); | |
67 | asmlinkage void alignment_check(void); | |
68 | asmlinkage void machine_check(void); | |
69 | asmlinkage void spurious_interrupt_bug(void); | |
1da177e4 | 70 | |
e041c683 | 71 | ATOMIC_NOTIFIER_HEAD(die_chain); |
2ee60e17 | 72 | EXPORT_SYMBOL(die_chain); |
1da177e4 LT |
73 | |
74 | int register_die_notifier(struct notifier_block *nb) | |
75 | { | |
8c914cb7 | 76 | vmalloc_sync_all(); |
e041c683 AS |
77 | return atomic_notifier_chain_register(&die_chain, nb); |
78 | } | |
1454aed9 | 79 | EXPORT_SYMBOL(register_die_notifier); /* used modular by kdb */ |
e041c683 AS |
80 | |
81 | int unregister_die_notifier(struct notifier_block *nb) | |
82 | { | |
83 | return atomic_notifier_chain_unregister(&die_chain, nb); | |
1da177e4 | 84 | } |
1454aed9 | 85 | EXPORT_SYMBOL(unregister_die_notifier); /* used modular by kdb */ |
1da177e4 LT |
86 | |
87 | static inline void conditional_sti(struct pt_regs *regs) | |
88 | { | |
89 | if (regs->eflags & X86_EFLAGS_IF) | |
90 | local_irq_enable(); | |
91 | } | |
92 | ||
a65d17c9 JB |
93 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
94 | { | |
95 | preempt_disable(); | |
96 | if (regs->eflags & X86_EFLAGS_IF) | |
97 | local_irq_enable(); | |
98 | } | |
99 | ||
100 | static inline void preempt_conditional_cli(struct pt_regs *regs) | |
101 | { | |
102 | if (regs->eflags & X86_EFLAGS_IF) | |
103 | local_irq_disable(); | |
40e59a61 AK |
104 | /* Make sure to not schedule here because we could be running |
105 | on an exception stack. */ | |
a65d17c9 JB |
106 | preempt_enable_no_resched(); |
107 | } | |
108 | ||
cab093b9 | 109 | static int kstack_depth_to_print = 12; |
ea424055 | 110 | #ifdef CONFIG_STACK_UNWIND |
c33bd9aa | 111 | static int call_trace = 1; |
ea424055 JB |
112 | #else |
113 | #define call_trace (-1) | |
114 | #endif | |
1da177e4 LT |
115 | |
116 | #ifdef CONFIG_KALLSYMS | |
3ac94932 IM |
117 | # include <linux/kallsyms.h> |
118 | void printk_address(unsigned long address) | |
119 | { | |
1da177e4 LT |
120 | unsigned long offset = 0, symsize; |
121 | const char *symname; | |
122 | char *modname; | |
3ac94932 | 123 | char *delim = ":"; |
1da177e4 LT |
124 | char namebuf[128]; |
125 | ||
3ac94932 IM |
126 | symname = kallsyms_lookup(address, &symsize, &offset, |
127 | &modname, namebuf); | |
128 | if (!symname) { | |
129 | printk(" [<%016lx>]\n", address); | |
130 | return; | |
131 | } | |
132 | if (!modname) | |
1da177e4 | 133 | modname = delim = ""; |
3ac94932 IM |
134 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
135 | address, delim, modname, delim, symname, offset, symsize); | |
136 | } | |
1da177e4 | 137 | #else |
3ac94932 IM |
138 | void printk_address(unsigned long address) |
139 | { | |
140 | printk(" [<%016lx>]\n", address); | |
141 | } | |
1da177e4 LT |
142 | #endif |
143 | ||
0a658002 AK |
144 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
145 | unsigned *usedp, const char **idp) | |
146 | { | |
b556b35e | 147 | static char ids[][8] = { |
0a658002 AK |
148 | [DEBUG_STACK - 1] = "#DB", |
149 | [NMI_STACK - 1] = "NMI", | |
150 | [DOUBLEFAULT_STACK - 1] = "#DF", | |
151 | [STACKFAULT_STACK - 1] = "#SS", | |
152 | [MCE_STACK - 1] = "#MC", | |
b556b35e JB |
153 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
154 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" | |
155 | #endif | |
0a658002 AK |
156 | }; |
157 | unsigned k; | |
1da177e4 | 158 | |
c9ca1ba5 IM |
159 | /* |
160 | * Iterate over all exception stacks, and figure out whether | |
161 | * 'stack' is in one of them: | |
162 | */ | |
0a658002 AK |
163 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
164 | unsigned long end; | |
165 | ||
c9ca1ba5 IM |
166 | /* |
167 | * set 'end' to the end of the exception stack. | |
168 | */ | |
b556b35e | 169 | switch (k + 1) { |
c9ca1ba5 IM |
170 | /* |
171 | * TODO: this block is not needed i think, because | |
172 | * setup64.c:cpu_init() sets up t->ist[DEBUG_STACK] | |
173 | * properly too. | |
174 | */ | |
b556b35e JB |
175 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
176 | case DEBUG_STACK: | |
df79efde | 177 | end = cpu_pda(cpu)->debugstack + DEBUG_STKSZ; |
b556b35e JB |
178 | break; |
179 | #endif | |
180 | default: | |
01ebb77b | 181 | end = per_cpu(orig_ist, cpu).ist[k]; |
b556b35e JB |
182 | break; |
183 | } | |
c9ca1ba5 IM |
184 | /* |
185 | * Is 'stack' above this exception frame's end? | |
186 | * If yes then skip to the next frame. | |
187 | */ | |
0a658002 AK |
188 | if (stack >= end) |
189 | continue; | |
c9ca1ba5 IM |
190 | /* |
191 | * Is 'stack' above this exception frame's start address? | |
192 | * If yes then we found the right frame. | |
193 | */ | |
0a658002 | 194 | if (stack >= end - EXCEPTION_STKSZ) { |
c9ca1ba5 IM |
195 | /* |
196 | * Make sure we only iterate through an exception | |
197 | * stack once. If it comes up for the second time | |
198 | * then there's something wrong going on - just | |
199 | * break out and return NULL: | |
200 | */ | |
0a658002 AK |
201 | if (*usedp & (1U << k)) |
202 | break; | |
203 | *usedp |= 1U << k; | |
204 | *idp = ids[k]; | |
205 | return (unsigned long *)end; | |
206 | } | |
c9ca1ba5 IM |
207 | /* |
208 | * If this is a debug stack, and if it has a larger size than | |
209 | * the usual exception stacks, then 'stack' might still | |
210 | * be within the lower portion of the debug stack: | |
211 | */ | |
b556b35e JB |
212 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
213 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { | |
214 | unsigned j = N_EXCEPTION_STACKS - 1; | |
215 | ||
c9ca1ba5 IM |
216 | /* |
217 | * Black magic. A large debug stack is composed of | |
218 | * multiple exception stack entries, which we | |
219 | * iterate through now. Dont look: | |
220 | */ | |
b556b35e JB |
221 | do { |
222 | ++j; | |
223 | end -= EXCEPTION_STKSZ; | |
224 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); | |
225 | } while (stack < end - EXCEPTION_STKSZ); | |
226 | if (*usedp & (1U << j)) | |
227 | break; | |
228 | *usedp |= 1U << j; | |
229 | *idp = ids[j]; | |
230 | return (unsigned long *)end; | |
231 | } | |
232 | #endif | |
1da177e4 LT |
233 | } |
234 | return NULL; | |
0a658002 | 235 | } |
1da177e4 | 236 | |
c33bd9aa | 237 | static int show_trace_unwind(struct unwind_frame_info *info, void *context) |
b538ed27 | 238 | { |
3ac94932 | 239 | int n = 0; |
b538ed27 JB |
240 | |
241 | while (unwind(info) == 0 && UNW_PC(info)) { | |
3ac94932 IM |
242 | n++; |
243 | printk_address(UNW_PC(info)); | |
b538ed27 JB |
244 | if (arch_unw_user_mode(info)) |
245 | break; | |
246 | } | |
c33bd9aa | 247 | return n; |
b538ed27 JB |
248 | } |
249 | ||
1da177e4 LT |
250 | /* |
251 | * x86-64 can have upto three kernel stacks: | |
252 | * process stack | |
253 | * interrupt stack | |
0a658002 | 254 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
1da177e4 LT |
255 | */ |
256 | ||
b538ed27 | 257 | void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * stack) |
1da177e4 | 258 | { |
0a658002 | 259 | const unsigned cpu = safe_smp_processor_id(); |
df79efde | 260 | unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr; |
0a658002 | 261 | unsigned used = 0; |
1da177e4 | 262 | |
3ac94932 | 263 | printk("\nCall Trace:\n"); |
0a658002 | 264 | |
b538ed27 JB |
265 | if (!tsk) |
266 | tsk = current; | |
267 | ||
c33bd9aa JB |
268 | if (call_trace >= 0) { |
269 | int unw_ret = 0; | |
270 | struct unwind_frame_info info; | |
271 | ||
272 | if (regs) { | |
273 | if (unwind_init_frame_info(&info, tsk, regs) == 0) | |
274 | unw_ret = show_trace_unwind(&info, NULL); | |
275 | } else if (tsk == current) | |
276 | unw_ret = unwind_init_running(&info, show_trace_unwind, NULL); | |
277 | else { | |
278 | if (unwind_init_blocked(&info, tsk) == 0) | |
279 | unw_ret = show_trace_unwind(&info, NULL); | |
b538ed27 | 280 | } |
ea424055 JB |
281 | if (unw_ret > 0) { |
282 | if (call_trace == 1 && !arch_unw_user_mode(&info)) { | |
283 | print_symbol("DWARF2 unwinder stuck at %s\n", | |
284 | UNW_PC(&info)); | |
285 | if ((long)UNW_SP(&info) < 0) { | |
286 | printk("Leftover inexact backtrace:\n"); | |
287 | stack = (unsigned long *)UNW_SP(&info); | |
288 | } else | |
289 | printk("Full inexact backtrace again:\n"); | |
290 | } else if (call_trace >= 1) | |
c33bd9aa | 291 | return; |
b13761ec AK |
292 | else |
293 | printk("Full inexact backtrace again:\n"); | |
ea424055 | 294 | } else |
b13761ec | 295 | printk("Inexact backtrace:\n"); |
b538ed27 JB |
296 | } |
297 | ||
c9ca1ba5 IM |
298 | /* |
299 | * Print function call entries within a stack. 'cond' is the | |
300 | * "end of stackframe" condition, that the 'stack++' | |
301 | * iteration will eventually trigger. | |
302 | */ | |
0a658002 AK |
303 | #define HANDLE_STACK(cond) \ |
304 | do while (cond) { \ | |
1b2f6304 | 305 | unsigned long addr = *stack++; \ |
0a658002 AK |
306 | if (kernel_text_address(addr)) { \ |
307 | /* \ | |
308 | * If the address is either in the text segment of the \ | |
309 | * kernel, or in the region which contains vmalloc'ed \ | |
310 | * memory, it *may* be the address of a calling \ | |
311 | * routine; if so, print it so that someone tracing \ | |
312 | * down the cause of the crash will be able to figure \ | |
313 | * out the call path that was taken. \ | |
314 | */ \ | |
3ac94932 | 315 | printk_address(addr); \ |
0a658002 AK |
316 | } \ |
317 | } while (0) | |
318 | ||
c9ca1ba5 IM |
319 | /* |
320 | * Print function call entries in all stacks, starting at the | |
321 | * current stack address. If the stacks consist of nested | |
322 | * exceptions | |
323 | */ | |
324 | for ( ; ; ) { | |
0a658002 AK |
325 | const char *id; |
326 | unsigned long *estack_end; | |
327 | estack_end = in_exception_stack(cpu, (unsigned long)stack, | |
328 | &used, &id); | |
329 | ||
330 | if (estack_end) { | |
3ac94932 | 331 | printk(" <%s>", id); |
0a658002 | 332 | HANDLE_STACK (stack < estack_end); |
3ac94932 | 333 | printk(" <EOE>"); |
c9ca1ba5 IM |
334 | /* |
335 | * We link to the next stack via the | |
336 | * second-to-last pointer (index -2 to end) in the | |
337 | * exception stack: | |
338 | */ | |
0a658002 AK |
339 | stack = (unsigned long *) estack_end[-2]; |
340 | continue; | |
1da177e4 | 341 | } |
0a658002 AK |
342 | if (irqstack_end) { |
343 | unsigned long *irqstack; | |
344 | irqstack = irqstack_end - | |
345 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); | |
346 | ||
347 | if (stack >= irqstack && stack < irqstack_end) { | |
3ac94932 | 348 | printk(" <IRQ>"); |
0a658002 | 349 | HANDLE_STACK (stack < irqstack_end); |
c9ca1ba5 IM |
350 | /* |
351 | * We link to the next stack (which would be | |
352 | * the process stack normally) the last | |
353 | * pointer (index -1 to end) in the IRQ stack: | |
354 | */ | |
0a658002 AK |
355 | stack = (unsigned long *) (irqstack_end[-1]); |
356 | irqstack_end = NULL; | |
3ac94932 | 357 | printk(" <EOI>"); |
0a658002 | 358 | continue; |
1da177e4 | 359 | } |
1da177e4 | 360 | } |
0a658002 | 361 | break; |
1da177e4 | 362 | } |
0a658002 | 363 | |
c9ca1ba5 IM |
364 | /* |
365 | * This prints the process stack: | |
366 | */ | |
0a658002 AK |
367 | HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0); |
368 | #undef HANDLE_STACK | |
3ac94932 | 369 | |
1da177e4 LT |
370 | printk("\n"); |
371 | } | |
372 | ||
b538ed27 | 373 | static void _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long * rsp) |
1da177e4 LT |
374 | { |
375 | unsigned long *stack; | |
376 | int i; | |
377 | const int cpu = safe_smp_processor_id(); | |
df79efde RT |
378 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
379 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); | |
1da177e4 LT |
380 | |
381 | // debugging aid: "show_stack(NULL, NULL);" prints the | |
382 | // back trace for this cpu. | |
383 | ||
384 | if (rsp == NULL) { | |
385 | if (tsk) | |
386 | rsp = (unsigned long *)tsk->thread.rsp; | |
387 | else | |
388 | rsp = (unsigned long *)&rsp; | |
389 | } | |
390 | ||
391 | stack = rsp; | |
392 | for(i=0; i < kstack_depth_to_print; i++) { | |
393 | if (stack >= irqstack && stack <= irqstack_end) { | |
394 | if (stack == irqstack_end) { | |
395 | stack = (unsigned long *) (irqstack_end[-1]); | |
396 | printk(" <EOI> "); | |
397 | } | |
398 | } else { | |
399 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
400 | break; | |
401 | } | |
402 | if (i && ((i % 4) == 0)) | |
3ac94932 IM |
403 | printk("\n"); |
404 | printk(" %016lx", *stack++); | |
35faa714 | 405 | touch_nmi_watchdog(); |
1da177e4 | 406 | } |
b538ed27 JB |
407 | show_trace(tsk, regs, rsp); |
408 | } | |
409 | ||
410 | void show_stack(struct task_struct *tsk, unsigned long * rsp) | |
411 | { | |
412 | _show_stack(tsk, NULL, rsp); | |
1da177e4 LT |
413 | } |
414 | ||
415 | /* | |
416 | * The architecture-independent dump_stack generator | |
417 | */ | |
418 | void dump_stack(void) | |
419 | { | |
420 | unsigned long dummy; | |
b538ed27 | 421 | show_trace(NULL, NULL, &dummy); |
1da177e4 LT |
422 | } |
423 | ||
424 | EXPORT_SYMBOL(dump_stack); | |
425 | ||
426 | void show_registers(struct pt_regs *regs) | |
427 | { | |
428 | int i; | |
76381fee | 429 | int in_kernel = !user_mode(regs); |
1da177e4 LT |
430 | unsigned long rsp; |
431 | const int cpu = safe_smp_processor_id(); | |
df79efde | 432 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
1da177e4 LT |
433 | |
434 | rsp = regs->rsp; | |
435 | ||
436 | printk("CPU %d ", cpu); | |
437 | __show_regs(regs); | |
438 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", | |
e4f17c43 | 439 | cur->comm, cur->pid, task_thread_info(cur), cur); |
1da177e4 LT |
440 | |
441 | /* | |
442 | * When in-kernel, we also print out the stack and code at the | |
443 | * time of the fault.. | |
444 | */ | |
445 | if (in_kernel) { | |
446 | ||
447 | printk("Stack: "); | |
b538ed27 | 448 | _show_stack(NULL, regs, (unsigned long*)rsp); |
1da177e4 LT |
449 | |
450 | printk("\nCode: "); | |
2b692a87 | 451 | if (regs->rip < PAGE_OFFSET) |
1da177e4 LT |
452 | goto bad; |
453 | ||
2b692a87 | 454 | for (i=0; i<20; i++) { |
1da177e4 | 455 | unsigned char c; |
2b692a87 | 456 | if (__get_user(c, &((unsigned char*)regs->rip)[i])) { |
1da177e4 LT |
457 | bad: |
458 | printk(" Bad RIP value."); | |
459 | break; | |
460 | } | |
461 | printk("%02x ", c); | |
462 | } | |
463 | } | |
464 | printk("\n"); | |
465 | } | |
466 | ||
467 | void handle_BUG(struct pt_regs *regs) | |
468 | { | |
469 | struct bug_frame f; | |
5f1d189f JB |
470 | long len; |
471 | const char *prefix = ""; | |
1da177e4 | 472 | |
76381fee | 473 | if (user_mode(regs)) |
1da177e4 | 474 | return; |
77a75333 | 475 | if (__copy_from_user(&f, (const void __user *) regs->rip, |
1da177e4 LT |
476 | sizeof(struct bug_frame))) |
477 | return; | |
049cdefe | 478 | if (f.filename >= 0 || |
1da177e4 LT |
479 | f.ud2[0] != 0x0f || f.ud2[1] != 0x0b) |
480 | return; | |
5f1d189f JB |
481 | len = __strnlen_user((char *)(long)f.filename, PATH_MAX) - 1; |
482 | if (len < 0 || len >= PATH_MAX) | |
049cdefe | 483 | f.filename = (int)(long)"unmapped filename"; |
5f1d189f JB |
484 | else if (len > 50) { |
485 | f.filename += len - 50; | |
486 | prefix = "..."; | |
487 | } | |
1da177e4 | 488 | printk("----------- [cut here ] --------- [please bite here ] ---------\n"); |
5f1d189f | 489 | printk(KERN_ALERT "Kernel BUG at %s%.50s:%d\n", prefix, (char *)(long)f.filename, f.line); |
1da177e4 LT |
490 | } |
491 | ||
4f60fdf6 | 492 | #ifdef CONFIG_BUG |
1da177e4 LT |
493 | void out_of_line_bug(void) |
494 | { | |
495 | BUG(); | |
496 | } | |
2ee60e17 | 497 | EXPORT_SYMBOL(out_of_line_bug); |
4f60fdf6 | 498 | #endif |
1da177e4 LT |
499 | |
500 | static DEFINE_SPINLOCK(die_lock); | |
501 | static int die_owner = -1; | |
cdc60a4c | 502 | static unsigned int die_nest_count; |
1da177e4 | 503 | |
eddb6fb9 | 504 | unsigned __kprobes long oops_begin(void) |
1da177e4 | 505 | { |
1209140c JB |
506 | int cpu = safe_smp_processor_id(); |
507 | unsigned long flags; | |
508 | ||
509 | /* racy, but better than risking deadlock. */ | |
510 | local_irq_save(flags); | |
1da177e4 LT |
511 | if (!spin_trylock(&die_lock)) { |
512 | if (cpu == die_owner) | |
513 | /* nested oops. should stop eventually */; | |
514 | else | |
1209140c | 515 | spin_lock(&die_lock); |
1da177e4 | 516 | } |
cdc60a4c | 517 | die_nest_count++; |
1209140c | 518 | die_owner = cpu; |
1da177e4 | 519 | console_verbose(); |
1209140c JB |
520 | bust_spinlocks(1); |
521 | return flags; | |
1da177e4 LT |
522 | } |
523 | ||
eddb6fb9 | 524 | void __kprobes oops_end(unsigned long flags) |
1da177e4 LT |
525 | { |
526 | die_owner = -1; | |
1209140c | 527 | bust_spinlocks(0); |
cdc60a4c CM |
528 | die_nest_count--; |
529 | if (die_nest_count) | |
530 | /* We still own the lock */ | |
531 | local_irq_restore(flags); | |
532 | else | |
533 | /* Nest count reaches zero, release the lock. */ | |
534 | spin_unlock_irqrestore(&die_lock, flags); | |
1da177e4 | 535 | if (panic_on_oops) |
012c437d | 536 | panic("Fatal exception"); |
1209140c | 537 | } |
1da177e4 | 538 | |
eddb6fb9 | 539 | void __kprobes __die(const char * str, struct pt_regs * regs, long err) |
1da177e4 LT |
540 | { |
541 | static int die_counter; | |
542 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); | |
543 | #ifdef CONFIG_PREEMPT | |
544 | printk("PREEMPT "); | |
545 | #endif | |
546 | #ifdef CONFIG_SMP | |
547 | printk("SMP "); | |
548 | #endif | |
549 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
550 | printk("DEBUG_PAGEALLOC"); | |
551 | #endif | |
552 | printk("\n"); | |
6e3f3617 | 553 | notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); |
1da177e4 LT |
554 | show_registers(regs); |
555 | /* Executive summary in case the oops scrolled away */ | |
556 | printk(KERN_ALERT "RIP "); | |
557 | printk_address(regs->rip); | |
558 | printk(" RSP <%016lx>\n", regs->rsp); | |
8bcc5280 VG |
559 | if (kexec_should_crash(current)) |
560 | crash_kexec(regs); | |
1da177e4 LT |
561 | } |
562 | ||
563 | void die(const char * str, struct pt_regs * regs, long err) | |
564 | { | |
1209140c JB |
565 | unsigned long flags = oops_begin(); |
566 | ||
1da177e4 LT |
567 | handle_BUG(regs); |
568 | __die(str, regs, err); | |
1209140c | 569 | oops_end(flags); |
1da177e4 LT |
570 | do_exit(SIGSEGV); |
571 | } | |
1da177e4 | 572 | |
eddb6fb9 | 573 | void __kprobes die_nmi(char *str, struct pt_regs *regs) |
1da177e4 | 574 | { |
1209140c JB |
575 | unsigned long flags = oops_begin(); |
576 | ||
1da177e4 LT |
577 | /* |
578 | * We are in trouble anyway, lets at least try | |
579 | * to get a message out. | |
580 | */ | |
581 | printk(str, safe_smp_processor_id()); | |
582 | show_registers(regs); | |
8bcc5280 VG |
583 | if (kexec_should_crash(current)) |
584 | crash_kexec(regs); | |
1da177e4 LT |
585 | if (panic_on_timeout || panic_on_oops) |
586 | panic("nmi watchdog"); | |
587 | printk("console shuts up ...\n"); | |
1209140c | 588 | oops_end(flags); |
8b1ffe95 CM |
589 | nmi_exit(); |
590 | local_irq_enable(); | |
1da177e4 LT |
591 | do_exit(SIGSEGV); |
592 | } | |
593 | ||
0f2fbdcb PP |
594 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
595 | struct pt_regs * regs, long error_code, | |
596 | siginfo_t *info) | |
1da177e4 | 597 | { |
6e3f3617 JB |
598 | struct task_struct *tsk = current; |
599 | ||
6e3f3617 JB |
600 | tsk->thread.error_code = error_code; |
601 | tsk->thread.trap_no = trapnr; | |
1da177e4 | 602 | |
6e3f3617 | 603 | if (user_mode(regs)) { |
1da177e4 LT |
604 | if (exception_trace && unhandled_signal(tsk, signr)) |
605 | printk(KERN_INFO | |
606 | "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n", | |
607 | tsk->comm, tsk->pid, str, | |
2b692a87 | 608 | regs->rip, regs->rsp, error_code); |
1da177e4 | 609 | |
1da177e4 LT |
610 | if (info) |
611 | force_sig_info(signr, info, tsk); | |
612 | else | |
613 | force_sig(signr, tsk); | |
614 | return; | |
615 | } | |
616 | ||
617 | ||
618 | /* kernel trap */ | |
619 | { | |
620 | const struct exception_table_entry *fixup; | |
621 | fixup = search_exception_tables(regs->rip); | |
2b692a87 | 622 | if (fixup) |
1da177e4 | 623 | regs->rip = fixup->fixup; |
2b692a87 | 624 | else |
1da177e4 LT |
625 | die(str, regs, error_code); |
626 | return; | |
627 | } | |
628 | } | |
629 | ||
630 | #define DO_ERROR(trapnr, signr, str, name) \ | |
631 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
632 | { \ | |
633 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
634 | == NOTIFY_STOP) \ | |
635 | return; \ | |
40e59a61 | 636 | conditional_sti(regs); \ |
1da177e4 LT |
637 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
638 | } | |
639 | ||
640 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ | |
641 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ | |
642 | { \ | |
643 | siginfo_t info; \ | |
644 | info.si_signo = signr; \ | |
645 | info.si_errno = 0; \ | |
646 | info.si_code = sicode; \ | |
647 | info.si_addr = (void __user *)siaddr; \ | |
648 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ | |
649 | == NOTIFY_STOP) \ | |
650 | return; \ | |
40e59a61 | 651 | conditional_sti(regs); \ |
1da177e4 LT |
652 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
653 | } | |
654 | ||
655 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip) | |
656 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) | |
657 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) | |
100c0e36 | 658 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip) |
1da177e4 LT |
659 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
660 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) | |
661 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) | |
662 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) | |
663 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) | |
664 | DO_ERROR(18, SIGSEGV, "reserved", reserved) | |
40e59a61 AK |
665 | |
666 | /* Runs on IST stack */ | |
667 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) | |
668 | { | |
669 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, | |
670 | 12, SIGBUS) == NOTIFY_STOP) | |
671 | return; | |
672 | preempt_conditional_sti(regs); | |
673 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); | |
674 | preempt_conditional_cli(regs); | |
675 | } | |
eca37c18 JB |
676 | |
677 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) | |
678 | { | |
679 | static const char str[] = "double fault"; | |
680 | struct task_struct *tsk = current; | |
681 | ||
682 | /* Return not checked because double check cannot be ignored */ | |
683 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); | |
684 | ||
685 | tsk->thread.error_code = error_code; | |
686 | tsk->thread.trap_no = 8; | |
687 | ||
688 | /* This is always a kernel trap and never fixable (and thus must | |
689 | never return). */ | |
690 | for (;;) | |
691 | die(str, regs, error_code); | |
692 | } | |
1da177e4 | 693 | |
0f2fbdcb PP |
694 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
695 | long error_code) | |
1da177e4 | 696 | { |
6e3f3617 JB |
697 | struct task_struct *tsk = current; |
698 | ||
1da177e4 LT |
699 | conditional_sti(regs); |
700 | ||
6e3f3617 JB |
701 | tsk->thread.error_code = error_code; |
702 | tsk->thread.trap_no = 13; | |
1da177e4 | 703 | |
6e3f3617 | 704 | if (user_mode(regs)) { |
1da177e4 LT |
705 | if (exception_trace && unhandled_signal(tsk, SIGSEGV)) |
706 | printk(KERN_INFO | |
707 | "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n", | |
708 | tsk->comm, tsk->pid, | |
2b692a87 | 709 | regs->rip, regs->rsp, error_code); |
1da177e4 | 710 | |
1da177e4 LT |
711 | force_sig(SIGSEGV, tsk); |
712 | return; | |
713 | } | |
714 | ||
715 | /* kernel gp */ | |
716 | { | |
717 | const struct exception_table_entry *fixup; | |
718 | fixup = search_exception_tables(regs->rip); | |
719 | if (fixup) { | |
720 | regs->rip = fixup->fixup; | |
721 | return; | |
722 | } | |
723 | if (notify_die(DIE_GPF, "general protection fault", regs, | |
724 | error_code, 13, SIGSEGV) == NOTIFY_STOP) | |
725 | return; | |
726 | die("general protection fault", regs, error_code); | |
727 | } | |
728 | } | |
729 | ||
eddb6fb9 AK |
730 | static __kprobes void |
731 | mem_parity_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
732 | { |
733 | printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n"); | |
734 | printk("You probably have a hardware problem with your RAM chips\n"); | |
735 | ||
736 | /* Clear and disable the memory parity error line. */ | |
737 | reason = (reason & 0xf) | 4; | |
738 | outb(reason, 0x61); | |
739 | } | |
740 | ||
eddb6fb9 AK |
741 | static __kprobes void |
742 | io_check_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
743 | { |
744 | printk("NMI: IOCK error (debug interrupt?)\n"); | |
745 | show_registers(regs); | |
746 | ||
747 | /* Re-enable the IOCK line, wait for a few seconds */ | |
748 | reason = (reason & 0xf) | 8; | |
749 | outb(reason, 0x61); | |
750 | mdelay(2000); | |
751 | reason &= ~8; | |
752 | outb(reason, 0x61); | |
753 | } | |
754 | ||
eddb6fb9 AK |
755 | static __kprobes void |
756 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) | |
1da177e4 LT |
757 | { printk("Uhhuh. NMI received for unknown reason %02x.\n", reason); |
758 | printk("Dazed and confused, but trying to continue\n"); | |
759 | printk("Do you have a strange power saving mode enabled?\n"); | |
760 | } | |
761 | ||
6fefb0d1 AK |
762 | /* Runs on IST stack. This code must keep interrupts off all the time. |
763 | Nested NMIs are prevented by the CPU. */ | |
eddb6fb9 | 764 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
1da177e4 LT |
765 | { |
766 | unsigned char reason = 0; | |
76e4f660 AR |
767 | int cpu; |
768 | ||
769 | cpu = smp_processor_id(); | |
1da177e4 LT |
770 | |
771 | /* Only the BSP gets external NMIs from the system. */ | |
76e4f660 | 772 | if (!cpu) |
1da177e4 LT |
773 | reason = get_nmi_reason(); |
774 | ||
775 | if (!(reason & 0xc0)) { | |
6e3f3617 | 776 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
1da177e4 LT |
777 | == NOTIFY_STOP) |
778 | return; | |
779 | #ifdef CONFIG_X86_LOCAL_APIC | |
780 | /* | |
781 | * Ok, so this is none of the documented NMI sources, | |
782 | * so it must be the NMI watchdog. | |
783 | */ | |
784 | if (nmi_watchdog > 0) { | |
785 | nmi_watchdog_tick(regs,reason); | |
786 | return; | |
787 | } | |
788 | #endif | |
789 | unknown_nmi_error(reason, regs); | |
790 | return; | |
791 | } | |
6e3f3617 | 792 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
1da177e4 LT |
793 | return; |
794 | ||
795 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ | |
796 | ||
797 | if (reason & 0x80) | |
798 | mem_parity_error(reason, regs); | |
799 | if (reason & 0x40) | |
800 | io_check_error(reason, regs); | |
801 | } | |
802 | ||
b556b35e | 803 | /* runs on IST stack. */ |
0f2fbdcb | 804 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
1da177e4 LT |
805 | { |
806 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { | |
807 | return; | |
808 | } | |
40e59a61 | 809 | preempt_conditional_sti(regs); |
1da177e4 | 810 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
40e59a61 | 811 | preempt_conditional_cli(regs); |
1da177e4 LT |
812 | } |
813 | ||
6fefb0d1 AK |
814 | /* Help handler running on IST stack to switch back to user stack |
815 | for scheduling or signal handling. The actual stack switch is done in | |
816 | entry.S */ | |
eddb6fb9 | 817 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
6fefb0d1 AK |
818 | { |
819 | struct pt_regs *regs = eregs; | |
820 | /* Did already sync */ | |
821 | if (eregs == (struct pt_regs *)eregs->rsp) | |
822 | ; | |
823 | /* Exception from user space */ | |
76381fee | 824 | else if (user_mode(eregs)) |
bb049232 | 825 | regs = task_pt_regs(current); |
6fefb0d1 AK |
826 | /* Exception from kernel and interrupts are enabled. Move to |
827 | kernel process stack. */ | |
828 | else if (eregs->eflags & X86_EFLAGS_IF) | |
829 | regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs)); | |
830 | if (eregs != regs) | |
831 | *regs = *eregs; | |
832 | return regs; | |
833 | } | |
834 | ||
1da177e4 | 835 | /* runs on IST stack. */ |
0f2fbdcb PP |
836 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
837 | unsigned long error_code) | |
1da177e4 | 838 | { |
1da177e4 LT |
839 | unsigned long condition; |
840 | struct task_struct *tsk = current; | |
841 | siginfo_t info; | |
842 | ||
e9129e56 | 843 | get_debugreg(condition, 6); |
1da177e4 LT |
844 | |
845 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, | |
daeeafec | 846 | SIGTRAP) == NOTIFY_STOP) |
6fefb0d1 | 847 | return; |
daeeafec | 848 | |
a65d17c9 | 849 | preempt_conditional_sti(regs); |
1da177e4 LT |
850 | |
851 | /* Mask out spurious debug traps due to lazy DR7 setting */ | |
852 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { | |
853 | if (!tsk->thread.debugreg7) { | |
854 | goto clear_dr7; | |
855 | } | |
856 | } | |
857 | ||
858 | tsk->thread.debugreg6 = condition; | |
859 | ||
860 | /* Mask out spurious TF errors due to lazy TF clearing */ | |
daeeafec | 861 | if (condition & DR_STEP) { |
1da177e4 LT |
862 | /* |
863 | * The TF error should be masked out only if the current | |
864 | * process is not traced and if the TRAP flag has been set | |
865 | * previously by a tracing process (condition detected by | |
866 | * the PT_DTRACE flag); remember that the i386 TRAP flag | |
867 | * can be modified by the process itself in user mode, | |
868 | * allowing programs to debug themselves without the ptrace() | |
869 | * interface. | |
870 | */ | |
76381fee | 871 | if (!user_mode(regs)) |
1da177e4 | 872 | goto clear_TF_reenable; |
be61bff7 AK |
873 | /* |
874 | * Was the TF flag set by a debugger? If so, clear it now, | |
875 | * so that register information is correct. | |
876 | */ | |
877 | if (tsk->ptrace & PT_DTRACE) { | |
878 | regs->eflags &= ~TF_MASK; | |
879 | tsk->ptrace &= ~PT_DTRACE; | |
880 | } | |
1da177e4 LT |
881 | } |
882 | ||
883 | /* Ok, finally something we can handle */ | |
884 | tsk->thread.trap_no = 1; | |
885 | tsk->thread.error_code = error_code; | |
886 | info.si_signo = SIGTRAP; | |
887 | info.si_errno = 0; | |
888 | info.si_code = TRAP_BRKPT; | |
01b8faae JB |
889 | info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL; |
890 | force_sig_info(SIGTRAP, &info, tsk); | |
1da177e4 | 891 | |
1da177e4 | 892 | clear_dr7: |
e9129e56 | 893 | set_debugreg(0UL, 7); |
a65d17c9 | 894 | preempt_conditional_cli(regs); |
6fefb0d1 | 895 | return; |
1da177e4 LT |
896 | |
897 | clear_TF_reenable: | |
898 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); | |
1da177e4 | 899 | regs->eflags &= ~TF_MASK; |
a65d17c9 | 900 | preempt_conditional_cli(regs); |
1da177e4 LT |
901 | } |
902 | ||
6e3f3617 | 903 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
1da177e4 LT |
904 | { |
905 | const struct exception_table_entry *fixup; | |
906 | fixup = search_exception_tables(regs->rip); | |
907 | if (fixup) { | |
908 | regs->rip = fixup->fixup; | |
909 | return 1; | |
910 | } | |
6e3f3617 | 911 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
3a848f63 | 912 | /* Illegal floating point operation in the kernel */ |
6e3f3617 | 913 | current->thread.trap_no = trapnr; |
1da177e4 | 914 | die(str, regs, 0); |
1da177e4 LT |
915 | return 0; |
916 | } | |
917 | ||
918 | /* | |
919 | * Note that we play around with the 'TS' bit in an attempt to get | |
920 | * the correct behaviour even in the presence of the asynchronous | |
921 | * IRQ13 behaviour | |
922 | */ | |
923 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) | |
924 | { | |
925 | void __user *rip = (void __user *)(regs->rip); | |
926 | struct task_struct * task; | |
927 | siginfo_t info; | |
928 | unsigned short cwd, swd; | |
929 | ||
930 | conditional_sti(regs); | |
76381fee | 931 | if (!user_mode(regs) && |
6e3f3617 | 932 | kernel_math_error(regs, "kernel x87 math error", 16)) |
1da177e4 LT |
933 | return; |
934 | ||
935 | /* | |
936 | * Save the info for the exception handler and clear the error. | |
937 | */ | |
938 | task = current; | |
939 | save_init_fpu(task); | |
940 | task->thread.trap_no = 16; | |
941 | task->thread.error_code = 0; | |
942 | info.si_signo = SIGFPE; | |
943 | info.si_errno = 0; | |
944 | info.si_code = __SI_FAULT; | |
945 | info.si_addr = rip; | |
946 | /* | |
947 | * (~cwd & swd) will mask out exceptions that are not set to unmasked | |
948 | * status. 0x3f is the exception bits in these regs, 0x200 is the | |
949 | * C1 reg you need in case of a stack fault, 0x040 is the stack | |
950 | * fault bit. We should only be taking one exception at a time, | |
951 | * so if this combination doesn't produce any single exception, | |
952 | * then we have a bad program that isn't synchronizing its FPU usage | |
953 | * and it will suffer the consequences since we won't be able to | |
954 | * fully reproduce the context of the exception | |
955 | */ | |
956 | cwd = get_fpu_cwd(task); | |
957 | swd = get_fpu_swd(task); | |
ff347b22 | 958 | switch (swd & ~cwd & 0x3f) { |
1da177e4 LT |
959 | case 0x000: |
960 | default: | |
961 | break; | |
962 | case 0x001: /* Invalid Op */ | |
ff347b22 CE |
963 | /* |
964 | * swd & 0x240 == 0x040: Stack Underflow | |
965 | * swd & 0x240 == 0x240: Stack Overflow | |
966 | * User must clear the SF bit (0x40) if set | |
967 | */ | |
1da177e4 LT |
968 | info.si_code = FPE_FLTINV; |
969 | break; | |
970 | case 0x002: /* Denormalize */ | |
971 | case 0x010: /* Underflow */ | |
972 | info.si_code = FPE_FLTUND; | |
973 | break; | |
974 | case 0x004: /* Zero Divide */ | |
975 | info.si_code = FPE_FLTDIV; | |
976 | break; | |
977 | case 0x008: /* Overflow */ | |
978 | info.si_code = FPE_FLTOVF; | |
979 | break; | |
980 | case 0x020: /* Precision */ | |
981 | info.si_code = FPE_FLTRES; | |
982 | break; | |
983 | } | |
984 | force_sig_info(SIGFPE, &info, task); | |
985 | } | |
986 | ||
987 | asmlinkage void bad_intr(void) | |
988 | { | |
989 | printk("bad interrupt"); | |
990 | } | |
991 | ||
992 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) | |
993 | { | |
994 | void __user *rip = (void __user *)(regs->rip); | |
995 | struct task_struct * task; | |
996 | siginfo_t info; | |
997 | unsigned short mxcsr; | |
998 | ||
999 | conditional_sti(regs); | |
76381fee | 1000 | if (!user_mode(regs) && |
6e3f3617 | 1001 | kernel_math_error(regs, "kernel simd math error", 19)) |
1da177e4 LT |
1002 | return; |
1003 | ||
1004 | /* | |
1005 | * Save the info for the exception handler and clear the error. | |
1006 | */ | |
1007 | task = current; | |
1008 | save_init_fpu(task); | |
1009 | task->thread.trap_no = 19; | |
1010 | task->thread.error_code = 0; | |
1011 | info.si_signo = SIGFPE; | |
1012 | info.si_errno = 0; | |
1013 | info.si_code = __SI_FAULT; | |
1014 | info.si_addr = rip; | |
1015 | /* | |
1016 | * The SIMD FPU exceptions are handled a little differently, as there | |
1017 | * is only a single status/control register. Thus, to determine which | |
1018 | * unmasked exception was caught we must mask the exception mask bits | |
1019 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. | |
1020 | */ | |
1021 | mxcsr = get_fpu_mxcsr(task); | |
1022 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { | |
1023 | case 0x000: | |
1024 | default: | |
1025 | break; | |
1026 | case 0x001: /* Invalid Op */ | |
1027 | info.si_code = FPE_FLTINV; | |
1028 | break; | |
1029 | case 0x002: /* Denormalize */ | |
1030 | case 0x010: /* Underflow */ | |
1031 | info.si_code = FPE_FLTUND; | |
1032 | break; | |
1033 | case 0x004: /* Zero Divide */ | |
1034 | info.si_code = FPE_FLTDIV; | |
1035 | break; | |
1036 | case 0x008: /* Overflow */ | |
1037 | info.si_code = FPE_FLTOVF; | |
1038 | break; | |
1039 | case 0x020: /* Precision */ | |
1040 | info.si_code = FPE_FLTRES; | |
1041 | break; | |
1042 | } | |
1043 | force_sig_info(SIGFPE, &info, task); | |
1044 | } | |
1045 | ||
1046 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) | |
1047 | { | |
1048 | } | |
1049 | ||
1050 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) | |
89b831ef JS |
1051 | { |
1052 | } | |
1053 | ||
1054 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) | |
1da177e4 LT |
1055 | { |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * 'math_state_restore()' saves the current math information in the | |
1060 | * old math state array, and gets the new ones from the current task | |
1061 | * | |
1062 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. | |
1063 | * Don't touch unless you *really* know how it works. | |
1064 | */ | |
1065 | asmlinkage void math_state_restore(void) | |
1066 | { | |
1067 | struct task_struct *me = current; | |
1068 | clts(); /* Allow maths ops (or we recurse) */ | |
1069 | ||
1070 | if (!used_math()) | |
1071 | init_fpu(me); | |
1072 | restore_fpu_checking(&me->thread.i387.fxsave); | |
e4f17c43 | 1073 | task_thread_info(me)->status |= TS_USEDFPU; |
1da177e4 LT |
1074 | } |
1075 | ||
1da177e4 LT |
1076 | void __init trap_init(void) |
1077 | { | |
1078 | set_intr_gate(0,÷_error); | |
1079 | set_intr_gate_ist(1,&debug,DEBUG_STACK); | |
1080 | set_intr_gate_ist(2,&nmi,NMI_STACK); | |
b556b35e | 1081 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
0a521588 JB |
1082 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
1083 | set_intr_gate(5,&bounds); | |
1da177e4 LT |
1084 | set_intr_gate(6,&invalid_op); |
1085 | set_intr_gate(7,&device_not_available); | |
1086 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); | |
1087 | set_intr_gate(9,&coprocessor_segment_overrun); | |
1088 | set_intr_gate(10,&invalid_TSS); | |
1089 | set_intr_gate(11,&segment_not_present); | |
1090 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); | |
1091 | set_intr_gate(13,&general_protection); | |
1092 | set_intr_gate(14,&page_fault); | |
1093 | set_intr_gate(15,&spurious_interrupt_bug); | |
1094 | set_intr_gate(16,&coprocessor_error); | |
1095 | set_intr_gate(17,&alignment_check); | |
1096 | #ifdef CONFIG_X86_MCE | |
1097 | set_intr_gate_ist(18,&machine_check, MCE_STACK); | |
1098 | #endif | |
1099 | set_intr_gate(19,&simd_coprocessor_error); | |
1100 | ||
1101 | #ifdef CONFIG_IA32_EMULATION | |
1102 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); | |
1103 | #endif | |
1104 | ||
1da177e4 LT |
1105 | /* |
1106 | * Should be a barrier for any external CPU state. | |
1107 | */ | |
1108 | cpu_init(); | |
1109 | } | |
1110 | ||
1111 | ||
1112 | /* Actual parsing is done early in setup.c. */ | |
1113 | static int __init oops_dummy(char *s) | |
1114 | { | |
1115 | panic_on_oops = 1; | |
9b41046c | 1116 | return 1; |
1da177e4 LT |
1117 | } |
1118 | __setup("oops=", oops_dummy); | |
1119 | ||
1120 | static int __init kstack_setup(char *s) | |
1121 | { | |
1122 | kstack_depth_to_print = simple_strtoul(s,NULL,0); | |
9b41046c | 1123 | return 1; |
1da177e4 LT |
1124 | } |
1125 | __setup("kstack=", kstack_setup); | |
1126 | ||
ea424055 | 1127 | #ifdef CONFIG_STACK_UNWIND |
c33bd9aa JB |
1128 | static int __init call_trace_setup(char *s) |
1129 | { | |
1130 | if (strcmp(s, "old") == 0) | |
1131 | call_trace = -1; | |
1132 | else if (strcmp(s, "both") == 0) | |
1133 | call_trace = 0; | |
b13761ec | 1134 | else if (strcmp(s, "newfallback") == 0) |
c33bd9aa | 1135 | call_trace = 1; |
b13761ec AK |
1136 | else if (strcmp(s, "new") == 0) |
1137 | call_trace = 2; | |
c33bd9aa JB |
1138 | return 1; |
1139 | } | |
1140 | __setup("call_trace=", call_trace_setup); | |
ea424055 | 1141 | #endif |