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5a0015d6 CZ |
1 | /* |
2 | * arch/xtensa/kernel/traps.c | |
3 | * | |
4 | * Exception handling. | |
5 | * | |
6 | * Derived from code with the following copyrights: | |
7 | * Copyright (C) 1994 - 1999 by Ralf Baechle | |
8 | * Modified for R3000 by Paul M. Antoine, 1995, 1996 | |
9 | * Complete output from die() by Ulf Carlsson, 1998 | |
10 | * Copyright (C) 1999 Silicon Graphics, Inc. | |
11 | * | |
12 | * Essentially rewritten for the Xtensa architecture port. | |
13 | * | |
14 | * Copyright (C) 2001 - 2005 Tensilica Inc. | |
15 | * | |
16 | * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> | |
17 | * Chris Zankel <chris@zankel.net> | |
18 | * Marc Gauthier<marc@tensilica.com, marc@alumni.uwaterloo.ca> | |
19 | * Kevin Chea | |
20 | * | |
21 | * This file is subject to the terms and conditions of the GNU General Public | |
22 | * License. See the file "COPYING" in the main directory of this archive | |
23 | * for more details. | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/stringify.h> | |
31 | #include <linux/kallsyms.h> | |
5c888d53 | 32 | #include <linux/delay.h> |
5a891ed5 | 33 | #include <linux/hardirq.h> |
5a0015d6 CZ |
34 | |
35 | #include <asm/ptrace.h> | |
36 | #include <asm/timex.h> | |
37 | #include <asm/uaccess.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/processor.h> | |
2d6f82fe | 40 | #include <asm/traps.h> |
5a0015d6 CZ |
41 | |
42 | #ifdef CONFIG_KGDB | |
43 | extern int gdb_enter; | |
44 | extern int return_from_debug_flag; | |
45 | #endif | |
46 | ||
47 | /* | |
48 | * Machine specific interrupt handlers | |
49 | */ | |
50 | ||
51 | extern void kernel_exception(void); | |
52 | extern void user_exception(void); | |
53 | ||
54 | extern void fast_syscall_kernel(void); | |
55 | extern void fast_syscall_user(void); | |
56 | extern void fast_alloca(void); | |
57 | extern void fast_unaligned(void); | |
58 | extern void fast_second_level_miss(void); | |
59 | extern void fast_store_prohibited(void); | |
60 | extern void fast_coprocessor(void); | |
61 | ||
62 | extern void do_illegal_instruction (struct pt_regs*); | |
63 | extern void do_interrupt (struct pt_regs*); | |
64 | extern void do_unaligned_user (struct pt_regs*); | |
65 | extern void do_multihit (struct pt_regs*, unsigned long); | |
66 | extern void do_page_fault (struct pt_regs*, unsigned long); | |
67 | extern void do_debug (struct pt_regs*); | |
68 | extern void system_call (struct pt_regs*); | |
69 | ||
70 | /* | |
71 | * The vector table must be preceded by a save area (which | |
72 | * implies it must be in RAM, unless one places RAM immediately | |
73 | * before a ROM and puts the vector at the start of the ROM (!)) | |
74 | */ | |
75 | ||
76 | #define KRNL 0x01 | |
77 | #define USER 0x02 | |
78 | ||
79 | #define COPROCESSOR(x) \ | |
173d6681 | 80 | { EXCCAUSE_COPROCESSOR ## x ## _DISABLED, USER, fast_coprocessor } |
5a0015d6 CZ |
81 | |
82 | typedef struct { | |
83 | int cause; | |
84 | int fast; | |
85 | void* handler; | |
86 | } dispatch_init_table_t; | |
87 | ||
b91dc336 | 88 | static dispatch_init_table_t __initdata dispatch_init_table[] = { |
5a0015d6 | 89 | |
173d6681 CZ |
90 | { EXCCAUSE_ILLEGAL_INSTRUCTION, 0, do_illegal_instruction}, |
91 | { EXCCAUSE_SYSTEM_CALL, KRNL, fast_syscall_kernel }, | |
92 | { EXCCAUSE_SYSTEM_CALL, USER, fast_syscall_user }, | |
93 | { EXCCAUSE_SYSTEM_CALL, 0, system_call }, | |
94 | /* EXCCAUSE_INSTRUCTION_FETCH unhandled */ | |
95 | /* EXCCAUSE_LOAD_STORE_ERROR unhandled*/ | |
96 | { EXCCAUSE_LEVEL1_INTERRUPT, 0, do_interrupt }, | |
97 | { EXCCAUSE_ALLOCA, USER|KRNL, fast_alloca }, | |
98 | /* EXCCAUSE_INTEGER_DIVIDE_BY_ZERO unhandled */ | |
99 | /* EXCCAUSE_PRIVILEGED unhandled */ | |
5a0015d6 | 100 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION |
4ded6282 | 101 | #ifdef CONFIG_XTENSA_UNALIGNED_USER |
173d6681 | 102 | { EXCCAUSE_UNALIGNED, USER, fast_unaligned }, |
5a0015d6 | 103 | #else |
173d6681 | 104 | { EXCCAUSE_UNALIGNED, 0, do_unaligned_user }, |
5a0015d6 | 105 | #endif |
173d6681 | 106 | { EXCCAUSE_UNALIGNED, KRNL, fast_unaligned }, |
5a0015d6 | 107 | #endif |
e5083a63 | 108 | #ifdef CONFIG_MMU |
173d6681 CZ |
109 | { EXCCAUSE_ITLB_MISS, 0, do_page_fault }, |
110 | { EXCCAUSE_ITLB_MISS, USER|KRNL, fast_second_level_miss}, | |
111 | { EXCCAUSE_ITLB_MULTIHIT, 0, do_multihit }, | |
112 | { EXCCAUSE_ITLB_PRIVILEGE, 0, do_page_fault }, | |
113 | /* EXCCAUSE_SIZE_RESTRICTION unhandled */ | |
114 | { EXCCAUSE_FETCH_CACHE_ATTRIBUTE, 0, do_page_fault }, | |
115 | { EXCCAUSE_DTLB_MISS, USER|KRNL, fast_second_level_miss}, | |
116 | { EXCCAUSE_DTLB_MISS, 0, do_page_fault }, | |
117 | { EXCCAUSE_DTLB_MULTIHIT, 0, do_multihit }, | |
118 | { EXCCAUSE_DTLB_PRIVILEGE, 0, do_page_fault }, | |
119 | /* EXCCAUSE_DTLB_SIZE_RESTRICTION unhandled */ | |
120 | { EXCCAUSE_STORE_CACHE_ATTRIBUTE, USER|KRNL, fast_store_prohibited }, | |
121 | { EXCCAUSE_STORE_CACHE_ATTRIBUTE, 0, do_page_fault }, | |
122 | { EXCCAUSE_LOAD_CACHE_ATTRIBUTE, 0, do_page_fault }, | |
e5083a63 | 123 | #endif /* CONFIG_MMU */ |
5a0015d6 | 124 | /* XCCHAL_EXCCAUSE_FLOATING_POINT unhandled */ |
c658eac6 | 125 | #if XTENSA_HAVE_COPROCESSOR(0) |
5a0015d6 CZ |
126 | COPROCESSOR(0), |
127 | #endif | |
c658eac6 | 128 | #if XTENSA_HAVE_COPROCESSOR(1) |
5a0015d6 CZ |
129 | COPROCESSOR(1), |
130 | #endif | |
c658eac6 | 131 | #if XTENSA_HAVE_COPROCESSOR(2) |
5a0015d6 CZ |
132 | COPROCESSOR(2), |
133 | #endif | |
c658eac6 | 134 | #if XTENSA_HAVE_COPROCESSOR(3) |
5a0015d6 CZ |
135 | COPROCESSOR(3), |
136 | #endif | |
c658eac6 | 137 | #if XTENSA_HAVE_COPROCESSOR(4) |
5a0015d6 CZ |
138 | COPROCESSOR(4), |
139 | #endif | |
c658eac6 | 140 | #if XTENSA_HAVE_COPROCESSOR(5) |
5a0015d6 CZ |
141 | COPROCESSOR(5), |
142 | #endif | |
c658eac6 | 143 | #if XTENSA_HAVE_COPROCESSOR(6) |
5a0015d6 CZ |
144 | COPROCESSOR(6), |
145 | #endif | |
c658eac6 | 146 | #if XTENSA_HAVE_COPROCESSOR(7) |
5a0015d6 CZ |
147 | COPROCESSOR(7), |
148 | #endif | |
149 | { EXCCAUSE_MAPPED_DEBUG, 0, do_debug }, | |
150 | { -1, -1, 0 } | |
151 | ||
152 | }; | |
153 | ||
154 | /* The exception table <exc_table> serves two functions: | |
155 | * 1. it contains three dispatch tables (fast_user, fast_kernel, default-c) | |
156 | * 2. it is a temporary memory buffer for the exception handlers. | |
157 | */ | |
158 | ||
159 | unsigned long exc_table[EXC_TABLE_SIZE/4]; | |
160 | ||
161 | void die(const char*, struct pt_regs*, long); | |
162 | ||
163 | static inline void | |
164 | __die_if_kernel(const char *str, struct pt_regs *regs, long err) | |
165 | { | |
166 | if (!user_mode(regs)) | |
167 | die(str, regs, err); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Unhandled Exceptions. Kill user task or panic if in kernel space. | |
172 | */ | |
173 | ||
174 | void do_unhandled(struct pt_regs *regs, unsigned long exccause) | |
175 | { | |
176 | __die_if_kernel("Caught unhandled exception - should not happen", | |
177 | regs, SIGKILL); | |
178 | ||
179 | /* If in user mode, send SIGILL signal to current process */ | |
180 | printk("Caught unhandled exception in '%s' " | |
181 | "(pid = %d, pc = %#010lx) - should not happen\n" | |
182 | "\tEXCCAUSE is %ld\n", | |
19c5870c | 183 | current->comm, task_pid_nr(current), regs->pc, exccause); |
5a0015d6 CZ |
184 | force_sig(SIGILL, current); |
185 | } | |
186 | ||
187 | /* | |
188 | * Multi-hit exception. This if fatal! | |
189 | */ | |
190 | ||
191 | void do_multihit(struct pt_regs *regs, unsigned long exccause) | |
192 | { | |
193 | die("Caught multihit exception", regs, SIGKILL); | |
194 | } | |
195 | ||
196 | /* | |
2d1c645c MG |
197 | * IRQ handler. |
198 | * PS.INTLEVEL is the current IRQ priority level. | |
5a0015d6 CZ |
199 | */ |
200 | ||
5a0015d6 CZ |
201 | extern void do_IRQ(int, struct pt_regs *); |
202 | ||
2d1c645c | 203 | void do_interrupt(struct pt_regs *regs) |
5a0015d6 | 204 | { |
2d1c645c MG |
205 | static const unsigned int_level_mask[] = { |
206 | 0, | |
207 | XCHAL_INTLEVEL1_MASK, | |
208 | XCHAL_INTLEVEL2_MASK, | |
209 | XCHAL_INTLEVEL3_MASK, | |
210 | XCHAL_INTLEVEL4_MASK, | |
211 | XCHAL_INTLEVEL5_MASK, | |
212 | XCHAL_INTLEVEL6_MASK, | |
213 | XCHAL_INTLEVEL7_MASK, | |
214 | }; | |
215 | unsigned level = get_sr(ps) & PS_INTLEVEL_MASK; | |
216 | ||
217 | if (WARN_ON_ONCE(level >= ARRAY_SIZE(int_level_mask))) | |
218 | return; | |
5a0015d6 | 219 | |
2d1c645c MG |
220 | for (;;) { |
221 | unsigned intread = get_sr(interrupt); | |
222 | unsigned intenable = get_sr(intenable); | |
223 | unsigned int_at_level = intread & intenable & | |
224 | int_level_mask[level]; | |
225 | ||
226 | if (!int_at_level) | |
227 | return; | |
228 | ||
229 | /* | |
230 | * Clear the interrupt before processing, in case it's | |
231 | * edge-triggered or software-generated | |
232 | */ | |
233 | while (int_at_level) { | |
234 | unsigned i = __ffs(int_at_level); | |
235 | unsigned mask = 1 << i; | |
236 | ||
237 | int_at_level ^= mask; | |
238 | set_sr(mask, intclear); | |
239 | do_IRQ(i, regs); | |
5a0015d6 CZ |
240 | } |
241 | } | |
242 | } | |
243 | ||
244 | /* | |
245 | * Illegal instruction. Fatal if in kernel space. | |
246 | */ | |
247 | ||
248 | void | |
249 | do_illegal_instruction(struct pt_regs *regs) | |
250 | { | |
251 | __die_if_kernel("Illegal instruction in kernel", regs, SIGKILL); | |
252 | ||
253 | /* If in user mode, send SIGILL signal to current process. */ | |
254 | ||
255 | printk("Illegal Instruction in '%s' (pid = %d, pc = %#010lx)\n", | |
19c5870c | 256 | current->comm, task_pid_nr(current), regs->pc); |
5a0015d6 CZ |
257 | force_sig(SIGILL, current); |
258 | } | |
259 | ||
260 | ||
261 | /* | |
262 | * Handle unaligned memory accesses from user space. Kill task. | |
263 | * | |
264 | * If CONFIG_UNALIGNED_USER is not set, we don't allow unaligned memory | |
265 | * accesses causes from user space. | |
266 | */ | |
267 | ||
268 | #if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION | |
4ded6282 | 269 | #ifndef CONFIG_XTENSA_UNALIGNED_USER |
5a0015d6 CZ |
270 | void |
271 | do_unaligned_user (struct pt_regs *regs) | |
272 | { | |
273 | siginfo_t info; | |
274 | ||
275 | __die_if_kernel("Unhandled unaligned exception in kernel", | |
276 | regs, SIGKILL); | |
277 | ||
278 | current->thread.bad_vaddr = regs->excvaddr; | |
279 | current->thread.error_code = -3; | |
280 | printk("Unaligned memory access to %08lx in '%s' " | |
281 | "(pid = %d, pc = %#010lx)\n", | |
19c5870c | 282 | regs->excvaddr, current->comm, task_pid_nr(current), regs->pc); |
5a0015d6 CZ |
283 | info.si_signo = SIGBUS; |
284 | info.si_errno = 0; | |
285 | info.si_code = BUS_ADRALN; | |
286 | info.si_addr = (void *) regs->excvaddr; | |
287 | force_sig_info(SIGSEGV, &info, current); | |
288 | ||
289 | } | |
290 | #endif | |
291 | #endif | |
292 | ||
293 | void | |
294 | do_debug(struct pt_regs *regs) | |
295 | { | |
296 | #ifdef CONFIG_KGDB | |
297 | /* If remote debugging is configured AND enabled, we give control to | |
298 | * kgdb. Otherwise, we fall through, perhaps giving control to the | |
299 | * native debugger. | |
300 | */ | |
301 | ||
302 | if (gdb_enter) { | |
303 | extern void gdb_handle_exception(struct pt_regs *); | |
304 | gdb_handle_exception(regs); | |
305 | return_from_debug_flag = 1; | |
306 | return; | |
307 | } | |
308 | #endif | |
309 | ||
310 | __die_if_kernel("Breakpoint in kernel", regs, SIGKILL); | |
311 | ||
312 | /* If in user mode, send SIGTRAP signal to current process */ | |
313 | ||
314 | force_sig(SIGTRAP, current); | |
315 | } | |
316 | ||
317 | ||
28570e8d MF |
318 | /* Set exception C handler - for temporary use when probing exceptions */ |
319 | ||
320 | void * __init trap_set_handler(int cause, void *handler) | |
321 | { | |
322 | unsigned long *entry = &exc_table[EXC_TABLE_DEFAULT / 4 + cause]; | |
323 | void *previous = (void *)*entry; | |
324 | *entry = (unsigned long)handler; | |
325 | return previous; | |
326 | } | |
327 | ||
328 | ||
5a0015d6 CZ |
329 | /* |
330 | * Initialize dispatch tables. | |
331 | * | |
332 | * The exception vectors are stored compressed the __init section in the | |
333 | * dispatch_init_table. This function initializes the following three tables | |
334 | * from that compressed table: | |
335 | * - fast user first dispatch table for user exceptions | |
336 | * - fast kernel first dispatch table for kernel exceptions | |
337 | * - default C-handler C-handler called by the default fast handler. | |
338 | * | |
339 | * See vectors.S for more details. | |
340 | */ | |
341 | ||
342 | #define set_handler(idx,handler) (exc_table[idx] = (unsigned long) (handler)) | |
343 | ||
b91dc336 | 344 | void __init trap_init(void) |
5a0015d6 CZ |
345 | { |
346 | int i; | |
347 | ||
348 | /* Setup default vectors. */ | |
349 | ||
350 | for(i = 0; i < 64; i++) { | |
351 | set_handler(EXC_TABLE_FAST_USER/4 + i, user_exception); | |
352 | set_handler(EXC_TABLE_FAST_KERNEL/4 + i, kernel_exception); | |
353 | set_handler(EXC_TABLE_DEFAULT/4 + i, do_unhandled); | |
354 | } | |
355 | ||
356 | /* Setup specific handlers. */ | |
357 | ||
358 | for(i = 0; dispatch_init_table[i].cause >= 0; i++) { | |
359 | ||
360 | int fast = dispatch_init_table[i].fast; | |
361 | int cause = dispatch_init_table[i].cause; | |
362 | void *handler = dispatch_init_table[i].handler; | |
363 | ||
364 | if (fast == 0) | |
365 | set_handler (EXC_TABLE_DEFAULT/4 + cause, handler); | |
366 | if (fast && fast & USER) | |
367 | set_handler (EXC_TABLE_FAST_USER/4 + cause, handler); | |
368 | if (fast && fast & KRNL) | |
369 | set_handler (EXC_TABLE_FAST_KERNEL/4 + cause, handler); | |
370 | } | |
371 | ||
372 | /* Initialize EXCSAVE_1 to hold the address of the exception table. */ | |
373 | ||
374 | i = (unsigned long)exc_table; | |
bc5378fc | 375 | __asm__ __volatile__("wsr %0, excsave1\n" : : "a" (i)); |
5a0015d6 CZ |
376 | } |
377 | ||
378 | /* | |
379 | * This function dumps the current valid window frame and other base registers. | |
380 | */ | |
381 | ||
382 | void show_regs(struct pt_regs * regs) | |
383 | { | |
384 | int i, wmask; | |
385 | ||
386 | wmask = regs->wmask & ~1; | |
387 | ||
8d7e8240 | 388 | for (i = 0; i < 16; i++) { |
5a0015d6 | 389 | if ((i % 8) == 0) |
ad361c98 JP |
390 | printk(KERN_INFO "a%02d:", i); |
391 | printk(KERN_CONT " %08lx", regs->areg[i]); | |
5a0015d6 | 392 | } |
ad361c98 | 393 | printk(KERN_CONT "\n"); |
5a0015d6 CZ |
394 | |
395 | printk("pc: %08lx, ps: %08lx, depc: %08lx, excvaddr: %08lx\n", | |
396 | regs->pc, regs->ps, regs->depc, regs->excvaddr); | |
397 | printk("lbeg: %08lx, lend: %08lx lcount: %08lx, sar: %08lx\n", | |
398 | regs->lbeg, regs->lend, regs->lcount, regs->sar); | |
399 | if (user_mode(regs)) | |
400 | printk("wb: %08lx, ws: %08lx, wmask: %08lx, syscall: %ld\n", | |
401 | regs->windowbase, regs->windowstart, regs->wmask, | |
402 | regs->syscall); | |
403 | } | |
404 | ||
586411dc JW |
405 | static __always_inline unsigned long *stack_pointer(struct task_struct *task) |
406 | { | |
407 | unsigned long *sp; | |
408 | ||
409 | if (!task || task == current) | |
410 | __asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp)); | |
411 | else | |
412 | sp = (unsigned long *)task->thread.sp; | |
413 | ||
414 | return sp; | |
415 | } | |
416 | ||
5a0015d6 CZ |
417 | void show_trace(struct task_struct *task, unsigned long *sp) |
418 | { | |
419 | unsigned long a0, a1, pc; | |
420 | unsigned long sp_start, sp_end; | |
421 | ||
28a0ce7f JW |
422 | if (sp) |
423 | a1 = (unsigned long)sp; | |
424 | else | |
586411dc | 425 | a1 = (unsigned long)stack_pointer(task); |
5a0015d6 CZ |
426 | |
427 | sp_start = a1 & ~(THREAD_SIZE-1); | |
428 | sp_end = sp_start + THREAD_SIZE; | |
429 | ||
430 | printk("Call Trace:"); | |
431 | #ifdef CONFIG_KALLSYMS | |
432 | printk("\n"); | |
433 | #endif | |
434 | spill_registers(); | |
435 | ||
436 | while (a1 > sp_start && a1 < sp_end) { | |
437 | sp = (unsigned long*)a1; | |
438 | ||
439 | a0 = *(sp - 4); | |
440 | a1 = *(sp - 3); | |
441 | ||
442 | if (a1 <= (unsigned long) sp) | |
443 | break; | |
444 | ||
445 | pc = MAKE_PC_FROM_RA(a0, a1); | |
446 | ||
447 | if (kernel_text_address(pc)) { | |
448 | printk(" [<%08lx>] ", pc); | |
449 | print_symbol("%s\n", pc); | |
450 | } | |
451 | } | |
452 | printk("\n"); | |
453 | } | |
454 | ||
455 | /* | |
456 | * This routine abuses get_user()/put_user() to reference pointers | |
457 | * with at least a bit of error checking ... | |
458 | */ | |
459 | ||
460 | static int kstack_depth_to_print = 24; | |
461 | ||
462 | void show_stack(struct task_struct *task, unsigned long *sp) | |
463 | { | |
464 | int i = 0; | |
465 | unsigned long *stack; | |
466 | ||
28a0ce7f | 467 | if (!sp) |
586411dc | 468 | sp = stack_pointer(task); |
c4c4594b | 469 | stack = sp; |
5a0015d6 CZ |
470 | |
471 | printk("\nStack: "); | |
472 | ||
473 | for (i = 0; i < kstack_depth_to_print; i++) { | |
474 | if (kstack_end(sp)) | |
475 | break; | |
476 | if (i && ((i % 8) == 0)) | |
477 | printk("\n "); | |
478 | printk("%08lx ", *sp++); | |
479 | } | |
480 | printk("\n"); | |
481 | show_trace(task, stack); | |
482 | } | |
483 | ||
484 | void dump_stack(void) | |
485 | { | |
486 | show_stack(current, NULL); | |
487 | } | |
488 | ||
489 | EXPORT_SYMBOL(dump_stack); | |
490 | ||
491 | ||
492 | void show_code(unsigned int *pc) | |
493 | { | |
494 | long i; | |
495 | ||
496 | printk("\nCode:"); | |
497 | ||
498 | for(i = -3 ; i < 6 ; i++) { | |
499 | unsigned long insn; | |
500 | if (__get_user(insn, pc + i)) { | |
501 | printk(" (Bad address in pc)\n"); | |
502 | break; | |
503 | } | |
504 | printk("%c%08lx%c",(i?' ':'<'),insn,(i?' ':'>')); | |
505 | } | |
506 | } | |
507 | ||
34af946a | 508 | DEFINE_SPINLOCK(die_lock); |
5a0015d6 CZ |
509 | |
510 | void die(const char * str, struct pt_regs * regs, long err) | |
511 | { | |
512 | static int die_counter; | |
513 | int nl = 0; | |
514 | ||
515 | console_verbose(); | |
516 | spin_lock_irq(&die_lock); | |
517 | ||
518 | printk("%s: sig: %ld [#%d]\n", str, err, ++die_counter); | |
519 | #ifdef CONFIG_PREEMPT | |
520 | printk("PREEMPT "); | |
521 | nl = 1; | |
522 | #endif | |
523 | if (nl) | |
524 | printk("\n"); | |
525 | show_regs(regs); | |
526 | if (!user_mode(regs)) | |
527 | show_stack(NULL, (unsigned long*)regs->areg[1]); | |
528 | ||
373d4d09 | 529 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
5a0015d6 CZ |
530 | spin_unlock_irq(&die_lock); |
531 | ||
532 | if (in_interrupt()) | |
533 | panic("Fatal exception in interrupt"); | |
534 | ||
cea6a4ba | 535 | if (panic_on_oops) |
012c437d | 536 | panic("Fatal exception"); |
cea6a4ba | 537 | |
5a0015d6 CZ |
538 | do_exit(err); |
539 | } |