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1da177e4 LT |
1 | /* traps.c: high-level exception handler for FR-V |
2 | * | |
3 | * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/sched.h> |
13 | #include <linux/signal.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/user.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/linkage.h> | |
20 | #include <linux/init.h> | |
40234401 | 21 | #include <linux/module.h> |
1da177e4 | 22 | |
84e8cd6d | 23 | #include <asm/asm-offsets.h> |
1da177e4 LT |
24 | #include <asm/setup.h> |
25 | #include <asm/fpu.h> | |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/siginfo.h> | |
29 | #include <asm/unaligned.h> | |
30 | ||
31 | void show_backtrace(struct pt_regs *, unsigned long); | |
32 | ||
33 | extern asmlinkage void __break_hijack_kernel_event(void); | |
34 | ||
35 | /*****************************************************************************/ | |
36 | /* | |
37 | * instruction access error | |
38 | */ | |
39 | asmlinkage void insn_access_error(unsigned long esfr1, unsigned long epcr0, unsigned long esr0) | |
40 | { | |
41 | siginfo_t info; | |
42 | ||
43 | die_if_kernel("-- Insn Access Error --\n" | |
44 | "EPCR0 : %08lx\n" | |
45 | "ESR0 : %08lx\n", | |
46 | epcr0, esr0); | |
47 | ||
48 | info.si_signo = SIGSEGV; | |
49 | info.si_code = SEGV_ACCERR; | |
50 | info.si_errno = 0; | |
ff471b24 | 51 | info.si_addr = (void __user *) ((epcr0 & EPCR0_V) ? (epcr0 & EPCR0_PC) : __frame->pc); |
1da177e4 LT |
52 | |
53 | force_sig_info(info.si_signo, &info, current); | |
54 | } /* end insn_access_error() */ | |
55 | ||
56 | /*****************************************************************************/ | |
57 | /* | |
58 | * handler for: | |
59 | * - illegal instruction | |
60 | * - privileged instruction | |
61 | * - unsupported trap | |
62 | * - debug exceptions | |
63 | */ | |
64 | asmlinkage void illegal_instruction(unsigned long esfr1, unsigned long epcr0, unsigned long esr0) | |
65 | { | |
66 | siginfo_t info; | |
67 | ||
68 | die_if_kernel("-- Illegal Instruction --\n" | |
69 | "EPCR0 : %08lx\n" | |
70 | "ESR0 : %08lx\n" | |
71 | "ESFR1 : %08lx\n", | |
72 | epcr0, esr0, esfr1); | |
73 | ||
74 | info.si_errno = 0; | |
ff471b24 | 75 | info.si_addr = (void __user *) ((epcr0 & EPCR0_V) ? (epcr0 & EPCR0_PC) : __frame->pc); |
1da177e4 LT |
76 | |
77 | switch (__frame->tbr & TBR_TT) { | |
78 | case TBR_TT_ILLEGAL_INSTR: | |
79 | info.si_signo = SIGILL; | |
80 | info.si_code = ILL_ILLOPC; | |
81 | break; | |
82 | case TBR_TT_PRIV_INSTR: | |
83 | info.si_signo = SIGILL; | |
84 | info.si_code = ILL_PRVOPC; | |
85 | break; | |
86 | case TBR_TT_TRAP2 ... TBR_TT_TRAP126: | |
87 | info.si_signo = SIGILL; | |
88 | info.si_code = ILL_ILLTRP; | |
89 | break; | |
90 | /* GDB uses "tira gr0, #1" as a breakpoint instruction. */ | |
91 | case TBR_TT_TRAP1: | |
92 | case TBR_TT_BREAK: | |
93 | info.si_signo = SIGTRAP; | |
94 | info.si_code = | |
95 | (__frame->__status & REG__STATUS_STEPPED) ? TRAP_TRACE : TRAP_BRKPT; | |
96 | break; | |
97 | } | |
98 | ||
99 | force_sig_info(info.si_signo, &info, current); | |
100 | } /* end illegal_instruction() */ | |
101 | ||
e31c243f DH |
102 | /*****************************************************************************/ |
103 | /* | |
104 | * handle atomic operations with errors | |
105 | * - arguments in gr8, gr9, gr10 | |
106 | * - original memory value placed in gr5 | |
107 | * - replacement memory value placed in gr9 | |
108 | */ | |
109 | asmlinkage void atomic_operation(unsigned long esfr1, unsigned long epcr0, | |
110 | unsigned long esr0) | |
111 | { | |
112 | static DEFINE_SPINLOCK(atomic_op_lock); | |
ff471b24 AV |
113 | unsigned long x, y, z; |
114 | unsigned long __user *p; | |
e31c243f DH |
115 | mm_segment_t oldfs; |
116 | siginfo_t info; | |
117 | int ret; | |
118 | ||
119 | y = 0; | |
120 | z = 0; | |
121 | ||
122 | oldfs = get_fs(); | |
123 | if (!user_mode(__frame)) | |
124 | set_fs(KERNEL_DS); | |
125 | ||
126 | switch (__frame->tbr & TBR_TT) { | |
127 | /* TIRA gr0,#120 | |
128 | * u32 __atomic_user_cmpxchg32(u32 *ptr, u32 test, u32 new) | |
129 | */ | |
130 | case TBR_TT_ATOMIC_CMPXCHG32: | |
ff471b24 | 131 | p = (unsigned long __user *) __frame->gr8; |
e31c243f DH |
132 | x = __frame->gr9; |
133 | y = __frame->gr10; | |
134 | ||
135 | for (;;) { | |
136 | ret = get_user(z, p); | |
137 | if (ret < 0) | |
138 | goto error; | |
139 | ||
140 | if (z != x) | |
141 | goto done; | |
142 | ||
143 | spin_lock_irq(&atomic_op_lock); | |
144 | ||
145 | if (__get_user(z, p) == 0) { | |
146 | if (z != x) | |
147 | goto done2; | |
148 | ||
149 | if (__put_user(y, p) == 0) | |
150 | goto done2; | |
151 | goto error2; | |
152 | } | |
153 | ||
154 | spin_unlock_irq(&atomic_op_lock); | |
155 | } | |
156 | ||
157 | /* TIRA gr0,#121 | |
158 | * u32 __atomic_kernel_xchg32(void *v, u32 new) | |
159 | */ | |
160 | case TBR_TT_ATOMIC_XCHG32: | |
ff471b24 | 161 | p = (unsigned long __user *) __frame->gr8; |
e31c243f DH |
162 | y = __frame->gr9; |
163 | ||
164 | for (;;) { | |
165 | ret = get_user(z, p); | |
166 | if (ret < 0) | |
167 | goto error; | |
168 | ||
169 | spin_lock_irq(&atomic_op_lock); | |
170 | ||
171 | if (__get_user(z, p) == 0) { | |
172 | if (__put_user(y, p) == 0) | |
173 | goto done2; | |
174 | goto error2; | |
175 | } | |
176 | ||
177 | spin_unlock_irq(&atomic_op_lock); | |
178 | } | |
179 | ||
180 | /* TIRA gr0,#122 | |
181 | * ulong __atomic_kernel_XOR_return(ulong i, ulong *v) | |
182 | */ | |
183 | case TBR_TT_ATOMIC_XOR: | |
ff471b24 | 184 | p = (unsigned long __user *) __frame->gr8; |
e31c243f DH |
185 | x = __frame->gr9; |
186 | ||
187 | for (;;) { | |
188 | ret = get_user(z, p); | |
189 | if (ret < 0) | |
190 | goto error; | |
191 | ||
192 | spin_lock_irq(&atomic_op_lock); | |
193 | ||
194 | if (__get_user(z, p) == 0) { | |
195 | y = x ^ z; | |
196 | if (__put_user(y, p) == 0) | |
197 | goto done2; | |
198 | goto error2; | |
199 | } | |
200 | ||
201 | spin_unlock_irq(&atomic_op_lock); | |
202 | } | |
203 | ||
204 | /* TIRA gr0,#123 | |
205 | * ulong __atomic_kernel_OR_return(ulong i, ulong *v) | |
206 | */ | |
207 | case TBR_TT_ATOMIC_OR: | |
ff471b24 | 208 | p = (unsigned long __user *) __frame->gr8; |
e31c243f DH |
209 | x = __frame->gr9; |
210 | ||
211 | for (;;) { | |
212 | ret = get_user(z, p); | |
213 | if (ret < 0) | |
214 | goto error; | |
215 | ||
216 | spin_lock_irq(&atomic_op_lock); | |
217 | ||
218 | if (__get_user(z, p) == 0) { | |
219 | y = x ^ z; | |
220 | if (__put_user(y, p) == 0) | |
221 | goto done2; | |
222 | goto error2; | |
223 | } | |
224 | ||
225 | spin_unlock_irq(&atomic_op_lock); | |
226 | } | |
227 | ||
228 | /* TIRA gr0,#124 | |
229 | * ulong __atomic_kernel_AND_return(ulong i, ulong *v) | |
230 | */ | |
231 | case TBR_TT_ATOMIC_AND: | |
ff471b24 | 232 | p = (unsigned long __user *) __frame->gr8; |
e31c243f DH |
233 | x = __frame->gr9; |
234 | ||
235 | for (;;) { | |
236 | ret = get_user(z, p); | |
237 | if (ret < 0) | |
238 | goto error; | |
239 | ||
240 | spin_lock_irq(&atomic_op_lock); | |
241 | ||
242 | if (__get_user(z, p) == 0) { | |
243 | y = x & z; | |
244 | if (__put_user(y, p) == 0) | |
245 | goto done2; | |
246 | goto error2; | |
247 | } | |
248 | ||
249 | spin_unlock_irq(&atomic_op_lock); | |
250 | } | |
251 | ||
252 | /* TIRA gr0,#125 | |
253 | * int __atomic_user_sub_return(atomic_t *v, int i) | |
254 | */ | |
255 | case TBR_TT_ATOMIC_SUB: | |
ff471b24 | 256 | p = (unsigned long __user *) __frame->gr8; |
e31c243f DH |
257 | x = __frame->gr9; |
258 | ||
259 | for (;;) { | |
260 | ret = get_user(z, p); | |
261 | if (ret < 0) | |
262 | goto error; | |
263 | ||
264 | spin_lock_irq(&atomic_op_lock); | |
265 | ||
266 | if (__get_user(z, p) == 0) { | |
267 | y = z - x; | |
268 | if (__put_user(y, p) == 0) | |
269 | goto done2; | |
270 | goto error2; | |
271 | } | |
272 | ||
273 | spin_unlock_irq(&atomic_op_lock); | |
274 | } | |
275 | ||
276 | /* TIRA gr0,#126 | |
277 | * int __atomic_user_add_return(atomic_t *v, int i) | |
278 | */ | |
279 | case TBR_TT_ATOMIC_ADD: | |
ff471b24 | 280 | p = (unsigned long __user *) __frame->gr8; |
e31c243f DH |
281 | x = __frame->gr9; |
282 | ||
283 | for (;;) { | |
284 | ret = get_user(z, p); | |
285 | if (ret < 0) | |
286 | goto error; | |
287 | ||
288 | spin_lock_irq(&atomic_op_lock); | |
289 | ||
290 | if (__get_user(z, p) == 0) { | |
291 | y = z + x; | |
292 | if (__put_user(y, p) == 0) | |
293 | goto done2; | |
294 | goto error2; | |
295 | } | |
296 | ||
297 | spin_unlock_irq(&atomic_op_lock); | |
298 | } | |
299 | ||
300 | default: | |
301 | BUG(); | |
302 | } | |
303 | ||
304 | done2: | |
305 | spin_unlock_irq(&atomic_op_lock); | |
306 | done: | |
307 | if (!user_mode(__frame)) | |
308 | set_fs(oldfs); | |
309 | __frame->gr5 = z; | |
310 | __frame->gr9 = y; | |
311 | return; | |
312 | ||
313 | error2: | |
314 | spin_unlock_irq(&atomic_op_lock); | |
315 | error: | |
316 | if (!user_mode(__frame)) | |
317 | set_fs(oldfs); | |
318 | __frame->pc -= 4; | |
319 | ||
320 | die_if_kernel("-- Atomic Op Error --\n"); | |
321 | ||
322 | info.si_signo = SIGSEGV; | |
323 | info.si_code = SEGV_ACCERR; | |
324 | info.si_errno = 0; | |
ff471b24 | 325 | info.si_addr = (void __user *) __frame->pc; |
e31c243f DH |
326 | |
327 | force_sig_info(info.si_signo, &info, current); | |
328 | } | |
329 | ||
1da177e4 LT |
330 | /*****************************************************************************/ |
331 | /* | |
332 | * | |
333 | */ | |
334 | asmlinkage void media_exception(unsigned long msr0, unsigned long msr1) | |
335 | { | |
336 | siginfo_t info; | |
337 | ||
338 | die_if_kernel("-- Media Exception --\n" | |
339 | "MSR0 : %08lx\n" | |
340 | "MSR1 : %08lx\n", | |
341 | msr0, msr1); | |
342 | ||
343 | info.si_signo = SIGFPE; | |
344 | info.si_code = FPE_MDAOVF; | |
345 | info.si_errno = 0; | |
ff471b24 | 346 | info.si_addr = (void __user *) __frame->pc; |
1da177e4 LT |
347 | |
348 | force_sig_info(info.si_signo, &info, current); | |
349 | } /* end media_exception() */ | |
350 | ||
351 | /*****************************************************************************/ | |
352 | /* | |
353 | * instruction or data access exception | |
354 | */ | |
355 | asmlinkage void memory_access_exception(unsigned long esr0, | |
356 | unsigned long ear0, | |
357 | unsigned long epcr0) | |
358 | { | |
359 | siginfo_t info; | |
360 | ||
361 | #ifdef CONFIG_MMU | |
362 | unsigned long fixup; | |
363 | ||
6510d419 HH |
364 | fixup = search_exception_table(__frame->pc); |
365 | if (fixup) { | |
1da177e4 LT |
366 | __frame->pc = fixup; |
367 | return; | |
368 | } | |
369 | #endif | |
370 | ||
371 | die_if_kernel("-- Memory Access Exception --\n" | |
372 | "ESR0 : %08lx\n" | |
373 | "EAR0 : %08lx\n" | |
374 | "EPCR0 : %08lx\n", | |
375 | esr0, ear0, epcr0); | |
376 | ||
377 | info.si_signo = SIGSEGV; | |
378 | info.si_code = SEGV_ACCERR; | |
379 | info.si_errno = 0; | |
380 | info.si_addr = NULL; | |
381 | ||
382 | if ((esr0 & (ESRx_VALID | ESR0_EAV)) == (ESRx_VALID | ESR0_EAV)) | |
ff471b24 | 383 | info.si_addr = (void __user *) ear0; |
1da177e4 LT |
384 | |
385 | force_sig_info(info.si_signo, &info, current); | |
386 | ||
387 | } /* end memory_access_exception() */ | |
388 | ||
389 | /*****************************************************************************/ | |
390 | /* | |
391 | * data access error | |
392 | * - double-word data load from CPU control area (0xFExxxxxx) | |
393 | * - read performed on inactive or self-refreshing SDRAM | |
394 | * - error notification from slave device | |
395 | * - misaligned address | |
396 | * - access to out of bounds memory region | |
397 | * - user mode accessing privileged memory region | |
398 | * - write to R/O memory region | |
399 | */ | |
400 | asmlinkage void data_access_error(unsigned long esfr1, unsigned long esr15, unsigned long ear15) | |
401 | { | |
402 | siginfo_t info; | |
403 | ||
404 | die_if_kernel("-- Data Access Error --\n" | |
405 | "ESR15 : %08lx\n" | |
406 | "EAR15 : %08lx\n", | |
407 | esr15, ear15); | |
408 | ||
409 | info.si_signo = SIGSEGV; | |
410 | info.si_code = SEGV_ACCERR; | |
411 | info.si_errno = 0; | |
ff471b24 | 412 | info.si_addr = (void __user *) |
1da177e4 LT |
413 | (((esr15 & (ESRx_VALID|ESR15_EAV)) == (ESRx_VALID|ESR15_EAV)) ? ear15 : 0); |
414 | ||
415 | force_sig_info(info.si_signo, &info, current); | |
416 | } /* end data_access_error() */ | |
417 | ||
418 | /*****************************************************************************/ | |
419 | /* | |
420 | * data store error - should only happen if accessing inactive or self-refreshing SDRAM | |
421 | */ | |
422 | asmlinkage void data_store_error(unsigned long esfr1, unsigned long esr15) | |
423 | { | |
424 | die_if_kernel("-- Data Store Error --\n" | |
425 | "ESR15 : %08lx\n", | |
426 | esr15); | |
427 | BUG(); | |
428 | } /* end data_store_error() */ | |
429 | ||
430 | /*****************************************************************************/ | |
431 | /* | |
432 | * | |
433 | */ | |
434 | asmlinkage void division_exception(unsigned long esfr1, unsigned long esr0, unsigned long isr) | |
435 | { | |
436 | siginfo_t info; | |
437 | ||
438 | die_if_kernel("-- Division Exception --\n" | |
439 | "ESR0 : %08lx\n" | |
440 | "ISR : %08lx\n", | |
441 | esr0, isr); | |
442 | ||
443 | info.si_signo = SIGFPE; | |
444 | info.si_code = FPE_INTDIV; | |
445 | info.si_errno = 0; | |
ff471b24 | 446 | info.si_addr = (void __user *) __frame->pc; |
1da177e4 LT |
447 | |
448 | force_sig_info(info.si_signo, &info, current); | |
449 | } /* end division_exception() */ | |
450 | ||
451 | /*****************************************************************************/ | |
452 | /* | |
453 | * | |
454 | */ | |
455 | asmlinkage void compound_exception(unsigned long esfr1, | |
456 | unsigned long esr0, unsigned long esr14, unsigned long esr15, | |
457 | unsigned long msr0, unsigned long msr1) | |
458 | { | |
459 | die_if_kernel("-- Compound Exception --\n" | |
460 | "ESR0 : %08lx\n" | |
461 | "ESR15 : %08lx\n" | |
462 | "ESR15 : %08lx\n" | |
463 | "MSR0 : %08lx\n" | |
464 | "MSR1 : %08lx\n", | |
465 | esr0, esr14, esr15, msr0, msr1); | |
466 | BUG(); | |
467 | } /* end compound_exception() */ | |
468 | ||
1da177e4 LT |
469 | void show_stack(struct task_struct *task, unsigned long *sp) |
470 | { | |
471 | } | |
472 | ||
473 | void show_trace_task(struct task_struct *tsk) | |
474 | { | |
475 | printk("CONTEXT: stack=0x%lx frame=0x%p LR=0x%lx RET=0x%lx\n", | |
476 | tsk->thread.sp, tsk->thread.frame, tsk->thread.lr, tsk->thread.sched_lr); | |
477 | } | |
478 | ||
479 | static const char *regnames[] = { | |
480 | "PSR ", "ISR ", "CCR ", "CCCR", | |
481 | "LR ", "LCR ", "PC ", "_stt", | |
482 | "sys ", "GR8*", "GNE0", "GNE1", | |
483 | "IACH", "IACL", | |
484 | "TBR ", "SP ", "FP ", "GR3 ", | |
485 | "GR4 ", "GR5 ", "GR6 ", "GR7 ", | |
486 | "GR8 ", "GR9 ", "GR10", "GR11", | |
487 | "GR12", "GR13", "GR14", "GR15", | |
488 | "GR16", "GR17", "GR18", "GR19", | |
489 | "GR20", "GR21", "GR22", "GR23", | |
490 | "GR24", "GR25", "GR26", "GR27", | |
491 | "EFRM", "CURR", "GR30", "BFRM" | |
492 | }; | |
493 | ||
494 | void show_regs(struct pt_regs *regs) | |
495 | { | |
84e8cd6d | 496 | unsigned long *reg; |
1da177e4 LT |
497 | int loop; |
498 | ||
499 | printk("\n"); | |
a43cb95d | 500 | show_regs_print_info(KERN_DEFAULT); |
1da177e4 | 501 | |
84e8cd6d DH |
502 | printk("Frame: @%08lx [%s]\n", |
503 | (unsigned long) regs, | |
1da177e4 LT |
504 | regs->psr & PSR_S ? "kernel" : "user"); |
505 | ||
84e8cd6d DH |
506 | reg = (unsigned long *) regs; |
507 | for (loop = 0; loop < NR_PT_REGS; loop++) { | |
508 | printk("%s %08lx", regnames[loop + 0], reg[loop + 0]); | |
1da177e4 | 509 | |
84e8cd6d | 510 | if (loop == NR_PT_REGS - 1 || loop % 5 == 4) |
1da177e4 LT |
511 | printk("\n"); |
512 | else | |
513 | printk(" | "); | |
514 | } | |
1da177e4 LT |
515 | } |
516 | ||
517 | void die_if_kernel(const char *str, ...) | |
518 | { | |
519 | char buffer[256]; | |
520 | va_list va; | |
521 | ||
522 | if (user_mode(__frame)) | |
523 | return; | |
524 | ||
525 | va_start(va, str); | |
760033c4 | 526 | vsnprintf(buffer, sizeof(buffer), str, va); |
1da177e4 LT |
527 | va_end(va); |
528 | ||
529 | console_verbose(); | |
530 | printk("\n===================================\n"); | |
531 | printk("%s\n", buffer); | |
532 | show_backtrace(__frame, 0); | |
533 | ||
534 | __break_hijack_kernel_event(); | |
535 | do_exit(SIGSEGV); | |
536 | } | |
537 | ||
538 | /*****************************************************************************/ | |
539 | /* | |
540 | * dump the contents of an exception frame | |
541 | */ | |
542 | static void show_backtrace_regs(struct pt_regs *frame) | |
543 | { | |
84e8cd6d | 544 | unsigned long *reg; |
1da177e4 LT |
545 | int loop; |
546 | ||
547 | /* print the registers for this frame */ | |
548 | printk("<-- %s Frame: @%p -->\n", | |
549 | frame->psr & PSR_S ? "Kernel Mode" : "User Mode", | |
550 | frame); | |
551 | ||
84e8cd6d DH |
552 | reg = (unsigned long *) frame; |
553 | for (loop = 0; loop < NR_PT_REGS; loop++) { | |
554 | printk("%s %08lx", regnames[loop + 0], reg[loop + 0]); | |
1da177e4 | 555 | |
84e8cd6d | 556 | if (loop == NR_PT_REGS - 1 || loop % 5 == 4) |
1da177e4 LT |
557 | printk("\n"); |
558 | else | |
559 | printk(" | "); | |
560 | } | |
561 | ||
562 | printk("--------\n"); | |
563 | } /* end show_backtrace_regs() */ | |
564 | ||
565 | /*****************************************************************************/ | |
566 | /* | |
567 | * generate a backtrace of the kernel stack | |
568 | */ | |
569 | void show_backtrace(struct pt_regs *frame, unsigned long sp) | |
570 | { | |
571 | struct pt_regs *frame0; | |
572 | unsigned long tos = 0, stop = 0, base; | |
573 | int format; | |
574 | ||
575 | base = ((((unsigned long) frame) + 8191) & ~8191) - sizeof(struct user_context); | |
576 | frame0 = (struct pt_regs *) base; | |
577 | ||
578 | if (sp) { | |
579 | tos = sp; | |
580 | stop = (unsigned long) frame; | |
581 | } | |
582 | ||
583 | printk("\nProcess %s (pid: %d)\n\n", current->comm, current->pid); | |
584 | ||
585 | for (;;) { | |
586 | /* dump stack segment between frames */ | |
587 | //printk("%08lx -> %08lx\n", tos, stop); | |
588 | format = 0; | |
589 | while (tos < stop) { | |
590 | if (format == 0) | |
591 | printk(" %04lx :", tos & 0xffff); | |
592 | ||
593 | printk(" %08lx", *(unsigned long *) tos); | |
594 | ||
595 | tos += 4; | |
596 | format++; | |
597 | if (format == 8) { | |
598 | printk("\n"); | |
599 | format = 0; | |
600 | } | |
601 | } | |
602 | ||
603 | if (format > 0) | |
604 | printk("\n"); | |
605 | ||
606 | /* dump frame 0 outside of the loop */ | |
607 | if (frame == frame0) | |
608 | break; | |
609 | ||
610 | tos = frame->sp; | |
611 | if (((unsigned long) frame) + sizeof(*frame) != tos) { | |
612 | printk("-- TOS %08lx does not follow frame %p --\n", | |
613 | tos, frame); | |
614 | break; | |
615 | } | |
616 | ||
617 | show_backtrace_regs(frame); | |
618 | ||
619 | /* dump the stack between this frame and the next */ | |
620 | stop = (unsigned long) frame->next_frame; | |
621 | if (stop != base && | |
622 | (stop < tos || | |
623 | stop > base || | |
624 | (stop < base && stop + sizeof(*frame) > base) || | |
625 | stop & 3)) { | |
626 | printk("-- next_frame %08lx is invalid (range %08lx-%08lx) --\n", | |
627 | stop, tos, base); | |
628 | break; | |
629 | } | |
630 | ||
631 | /* move to next frame */ | |
632 | frame = frame->next_frame; | |
633 | } | |
634 | ||
635 | /* we can always dump frame 0, even if the rest of the stack is corrupt */ | |
636 | show_backtrace_regs(frame0); | |
637 | ||
638 | } /* end show_backtrace() */ | |
639 | ||
640 | /*****************************************************************************/ | |
641 | /* | |
642 | * initialise traps | |
643 | */ | |
644 | void __init trap_init (void) | |
645 | { | |
646 | } /* end trap_init() */ |