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76#include <linux/context_tracking.h>
77#include <linux/mm.h>
78#include <linux/signal.h>
79#include <linux/smp.h>
80#include <linux/sched.h>
81#include <linux/debugfs.h>
82#include <linux/perf_event.h>
83
84#include <asm/asm.h>
85#include <asm/branch.h>
86#include <asm/byteorder.h>
87#include <asm/cop2.h>
88#include <asm/debug.h>
89#include <asm/fpu.h>
90#include <asm/fpu_emulator.h>
91#include <asm/inst.h>
92#include <linux/uaccess.h>
93
94#define STR(x) __STR(x)
95#define __STR(x) #x
96
97enum {
98 UNALIGNED_ACTION_QUIET,
99 UNALIGNED_ACTION_SIGNAL,
100 UNALIGNED_ACTION_SHOW,
101};
102#ifdef CONFIG_DEBUG_FS
103static u32 unaligned_instructions;
104static u32 unaligned_action;
105#else
106#define unaligned_action UNALIGNED_ACTION_QUIET
107#endif
108extern void show_registers(struct pt_regs *regs);
109
110#ifdef __BIG_ENDIAN
111#define _LoadHW(addr, value, res, type) \
112do { \
113 __asm__ __volatile__ (".set\tnoat\n" \
114 "1:\t"type##_lb("%0", "0(%2)")"\n" \
115 "2:\t"type##_lbu("$1", "1(%2)")"\n\t"\
116 "sll\t%0, 0x8\n\t" \
117 "or\t%0, $1\n\t" \
118 "li\t%1, 0\n" \
119 "3:\t.set\tat\n\t" \
120 ".insn\n\t" \
121 ".section\t.fixup,\"ax\"\n\t" \
122 "4:\tli\t%1, %3\n\t" \
123 "j\t3b\n\t" \
124 ".previous\n\t" \
125 ".section\t__ex_table,\"a\"\n\t" \
126 STR(PTR)"\t1b, 4b\n\t" \
127 STR(PTR)"\t2b, 4b\n\t" \
128 ".previous" \
129 : "=&r" (value), "=r" (res) \
130 : "r" (addr), "i" (-EFAULT)); \
131} while(0)
132
133#ifndef CONFIG_CPU_MIPSR6
134#define _LoadW(addr, value, res, type) \
135do { \
136 __asm__ __volatile__ ( \
137 "1:\t"type##_lwl("%0", "(%2)")"\n" \
138 "2:\t"type##_lwr("%0", "3(%2)")"\n\t"\
139 "li\t%1, 0\n" \
140 "3:\n\t" \
141 ".insn\n\t" \
142 ".section\t.fixup,\"ax\"\n\t" \
143 "4:\tli\t%1, %3\n\t" \
144 "j\t3b\n\t" \
145 ".previous\n\t" \
146 ".section\t__ex_table,\"a\"\n\t" \
147 STR(PTR)"\t1b, 4b\n\t" \
148 STR(PTR)"\t2b, 4b\n\t" \
149 ".previous" \
150 : "=&r" (value), "=r" (res) \
151 : "r" (addr), "i" (-EFAULT)); \
152} while(0)
153
154#else
155
156#define _LoadW(addr, value, res, type) \
157do { \
158 __asm__ __volatile__ ( \
159 ".set\tpush\n" \
160 ".set\tnoat\n\t" \
161 "1:"type##_lb("%0", "0(%2)")"\n\t" \
162 "2:"type##_lbu("$1", "1(%2)")"\n\t" \
163 "sll\t%0, 0x8\n\t" \
164 "or\t%0, $1\n\t" \
165 "3:"type##_lbu("$1", "2(%2)")"\n\t" \
166 "sll\t%0, 0x8\n\t" \
167 "or\t%0, $1\n\t" \
168 "4:"type##_lbu("$1", "3(%2)")"\n\t" \
169 "sll\t%0, 0x8\n\t" \
170 "or\t%0, $1\n\t" \
171 "li\t%1, 0\n" \
172 ".set\tpop\n" \
173 "10:\n\t" \
174 ".insn\n\t" \
175 ".section\t.fixup,\"ax\"\n\t" \
176 "11:\tli\t%1, %3\n\t" \
177 "j\t10b\n\t" \
178 ".previous\n\t" \
179 ".section\t__ex_table,\"a\"\n\t" \
180 STR(PTR)"\t1b, 11b\n\t" \
181 STR(PTR)"\t2b, 11b\n\t" \
182 STR(PTR)"\t3b, 11b\n\t" \
183 STR(PTR)"\t4b, 11b\n\t" \
184 ".previous" \
185 : "=&r" (value), "=r" (res) \
186 : "r" (addr), "i" (-EFAULT)); \
187} while(0)
188
189#endif
190
191#define _LoadHWU(addr, value, res, type) \
192do { \
193 __asm__ __volatile__ ( \
194 ".set\tnoat\n" \
195 "1:\t"type##_lbu("%0", "0(%2)")"\n" \
196 "2:\t"type##_lbu("$1", "1(%2)")"\n\t"\
197 "sll\t%0, 0x8\n\t" \
198 "or\t%0, $1\n\t" \
199 "li\t%1, 0\n" \
200 "3:\n\t" \
201 ".insn\n\t" \
202 ".set\tat\n\t" \
203 ".section\t.fixup,\"ax\"\n\t" \
204 "4:\tli\t%1, %3\n\t" \
205 "j\t3b\n\t" \
206 ".previous\n\t" \
207 ".section\t__ex_table,\"a\"\n\t" \
208 STR(PTR)"\t1b, 4b\n\t" \
209 STR(PTR)"\t2b, 4b\n\t" \
210 ".previous" \
211 : "=&r" (value), "=r" (res) \
212 : "r" (addr), "i" (-EFAULT)); \
213} while(0)
214
215#ifndef CONFIG_CPU_MIPSR6
216#define _LoadWU(addr, value, res, type) \
217do { \
218 __asm__ __volatile__ ( \
219 "1:\t"type##_lwl("%0", "(%2)")"\n" \
220 "2:\t"type##_lwr("%0", "3(%2)")"\n\t"\
221 "dsll\t%0, %0, 32\n\t" \
222 "dsrl\t%0, %0, 32\n\t" \
223 "li\t%1, 0\n" \
224 "3:\n\t" \
225 ".insn\n\t" \
226 "\t.section\t.fixup,\"ax\"\n\t" \
227 "4:\tli\t%1, %3\n\t" \
228 "j\t3b\n\t" \
229 ".previous\n\t" \
230 ".section\t__ex_table,\"a\"\n\t" \
231 STR(PTR)"\t1b, 4b\n\t" \
232 STR(PTR)"\t2b, 4b\n\t" \
233 ".previous" \
234 : "=&r" (value), "=r" (res) \
235 : "r" (addr), "i" (-EFAULT)); \
236} while(0)
237
238#define _LoadDW(addr, value, res) \
239do { \
240 __asm__ __volatile__ ( \
241 "1:\tldl\t%0, (%2)\n" \
242 "2:\tldr\t%0, 7(%2)\n\t" \
243 "li\t%1, 0\n" \
244 "3:\n\t" \
245 ".insn\n\t" \
246 "\t.section\t.fixup,\"ax\"\n\t" \
247 "4:\tli\t%1, %3\n\t" \
248 "j\t3b\n\t" \
249 ".previous\n\t" \
250 ".section\t__ex_table,\"a\"\n\t" \
251 STR(PTR)"\t1b, 4b\n\t" \
252 STR(PTR)"\t2b, 4b\n\t" \
253 ".previous" \
254 : "=&r" (value), "=r" (res) \
255 : "r" (addr), "i" (-EFAULT)); \
256} while(0)
257
258#else
259
260#define _LoadWU(addr, value, res, type) \
261do { \
262 __asm__ __volatile__ ( \
263 ".set\tpush\n\t" \
264 ".set\tnoat\n\t" \
265 "1:"type##_lbu("%0", "0(%2)")"\n\t" \
266 "2:"type##_lbu("$1", "1(%2)")"\n\t" \
267 "sll\t%0, 0x8\n\t" \
268 "or\t%0, $1\n\t" \
269 "3:"type##_lbu("$1", "2(%2)")"\n\t" \
270 "sll\t%0, 0x8\n\t" \
271 "or\t%0, $1\n\t" \
272 "4:"type##_lbu("$1", "3(%2)")"\n\t" \
273 "sll\t%0, 0x8\n\t" \
274 "or\t%0, $1\n\t" \
275 "li\t%1, 0\n" \
276 ".set\tpop\n" \
277 "10:\n\t" \
278 ".insn\n\t" \
279 ".section\t.fixup,\"ax\"\n\t" \
280 "11:\tli\t%1, %3\n\t" \
281 "j\t10b\n\t" \
282 ".previous\n\t" \
283 ".section\t__ex_table,\"a\"\n\t" \
284 STR(PTR)"\t1b, 11b\n\t" \
285 STR(PTR)"\t2b, 11b\n\t" \
286 STR(PTR)"\t3b, 11b\n\t" \
287 STR(PTR)"\t4b, 11b\n\t" \
288 ".previous" \
289 : "=&r" (value), "=r" (res) \
290 : "r" (addr), "i" (-EFAULT)); \
291} while(0)
292
293#define _LoadDW(addr, value, res) \
294do { \
295 __asm__ __volatile__ ( \
296 ".set\tpush\n\t" \
297 ".set\tnoat\n\t" \
298 "1:lb\t%0, 0(%2)\n\t" \
299 "2:lbu\t $1, 1(%2)\n\t" \
300 "dsll\t%0, 0x8\n\t" \
301 "or\t%0, $1\n\t" \
302 "3:lbu\t$1, 2(%2)\n\t" \
303 "dsll\t%0, 0x8\n\t" \
304 "or\t%0, $1\n\t" \
305 "4:lbu\t$1, 3(%2)\n\t" \
306 "dsll\t%0, 0x8\n\t" \
307 "or\t%0, $1\n\t" \
308 "5:lbu\t$1, 4(%2)\n\t" \
309 "dsll\t%0, 0x8\n\t" \
310 "or\t%0, $1\n\t" \
311 "6:lbu\t$1, 5(%2)\n\t" \
312 "dsll\t%0, 0x8\n\t" \
313 "or\t%0, $1\n\t" \
314 "7:lbu\t$1, 6(%2)\n\t" \
315 "dsll\t%0, 0x8\n\t" \
316 "or\t%0, $1\n\t" \
317 "8:lbu\t$1, 7(%2)\n\t" \
318 "dsll\t%0, 0x8\n\t" \
319 "or\t%0, $1\n\t" \
320 "li\t%1, 0\n" \
321 ".set\tpop\n\t" \
322 "10:\n\t" \
323 ".insn\n\t" \
324 ".section\t.fixup,\"ax\"\n\t" \
325 "11:\tli\t%1, %3\n\t" \
326 "j\t10b\n\t" \
327 ".previous\n\t" \
328 ".section\t__ex_table,\"a\"\n\t" \
329 STR(PTR)"\t1b, 11b\n\t" \
330 STR(PTR)"\t2b, 11b\n\t" \
331 STR(PTR)"\t3b, 11b\n\t" \
332 STR(PTR)"\t4b, 11b\n\t" \
333 STR(PTR)"\t5b, 11b\n\t" \
334 STR(PTR)"\t6b, 11b\n\t" \
335 STR(PTR)"\t7b, 11b\n\t" \
336 STR(PTR)"\t8b, 11b\n\t" \
337 ".previous" \
338 : "=&r" (value), "=r" (res) \
339 : "r" (addr), "i" (-EFAULT)); \
340} while(0)
341
342#endif
343
344
345#define _StoreHW(addr, value, res, type) \
346do { \
347 __asm__ __volatile__ ( \
348 ".set\tnoat\n" \
349 "1:\t"type##_sb("%1", "1(%2)")"\n" \
350 "srl\t$1, %1, 0x8\n" \
351 "2:\t"type##_sb("$1", "0(%2)")"\n" \
352 ".set\tat\n\t" \
353 "li\t%0, 0\n" \
354 "3:\n\t" \
355 ".insn\n\t" \
356 ".section\t.fixup,\"ax\"\n\t" \
357 "4:\tli\t%0, %3\n\t" \
358 "j\t3b\n\t" \
359 ".previous\n\t" \
360 ".section\t__ex_table,\"a\"\n\t" \
361 STR(PTR)"\t1b, 4b\n\t" \
362 STR(PTR)"\t2b, 4b\n\t" \
363 ".previous" \
364 : "=r" (res) \
365 : "r" (value), "r" (addr), "i" (-EFAULT));\
366} while(0)
367
368#ifndef CONFIG_CPU_MIPSR6
369#define _StoreW(addr, value, res, type) \
370do { \
371 __asm__ __volatile__ ( \
372 "1:\t"type##_swl("%1", "(%2)")"\n" \
373 "2:\t"type##_swr("%1", "3(%2)")"\n\t"\
374 "li\t%0, 0\n" \
375 "3:\n\t" \
376 ".insn\n\t" \
377 ".section\t.fixup,\"ax\"\n\t" \
378 "4:\tli\t%0, %3\n\t" \
379 "j\t3b\n\t" \
380 ".previous\n\t" \
381 ".section\t__ex_table,\"a\"\n\t" \
382 STR(PTR)"\t1b, 4b\n\t" \
383 STR(PTR)"\t2b, 4b\n\t" \
384 ".previous" \
385 : "=r" (res) \
386 : "r" (value), "r" (addr), "i" (-EFAULT)); \
387} while(0)
388
389#define _StoreDW(addr, value, res) \
390do { \
391 __asm__ __volatile__ ( \
392 "1:\tsdl\t%1,(%2)\n" \
393 "2:\tsdr\t%1, 7(%2)\n\t" \
394 "li\t%0, 0\n" \
395 "3:\n\t" \
396 ".insn\n\t" \
397 ".section\t.fixup,\"ax\"\n\t" \
398 "4:\tli\t%0, %3\n\t" \
399 "j\t3b\n\t" \
400 ".previous\n\t" \
401 ".section\t__ex_table,\"a\"\n\t" \
402 STR(PTR)"\t1b, 4b\n\t" \
403 STR(PTR)"\t2b, 4b\n\t" \
404 ".previous" \
405 : "=r" (res) \
406 : "r" (value), "r" (addr), "i" (-EFAULT)); \
407} while(0)
408
409#else
410
411#define _StoreW(addr, value, res, type) \
412do { \
413 __asm__ __volatile__ ( \
414 ".set\tpush\n\t" \
415 ".set\tnoat\n\t" \
416 "1:"type##_sb("%1", "3(%2)")"\n\t" \
417 "srl\t$1, %1, 0x8\n\t" \
418 "2:"type##_sb("$1", "2(%2)")"\n\t" \
419 "srl\t$1, $1, 0x8\n\t" \
420 "3:"type##_sb("$1", "1(%2)")"\n\t" \
421 "srl\t$1, $1, 0x8\n\t" \
422 "4:"type##_sb("$1", "0(%2)")"\n\t" \
423 ".set\tpop\n\t" \
424 "li\t%0, 0\n" \
425 "10:\n\t" \
426 ".insn\n\t" \
427 ".section\t.fixup,\"ax\"\n\t" \
428 "11:\tli\t%0, %3\n\t" \
429 "j\t10b\n\t" \
430 ".previous\n\t" \
431 ".section\t__ex_table,\"a\"\n\t" \
432 STR(PTR)"\t1b, 11b\n\t" \
433 STR(PTR)"\t2b, 11b\n\t" \
434 STR(PTR)"\t3b, 11b\n\t" \
435 STR(PTR)"\t4b, 11b\n\t" \
436 ".previous" \
437 : "=&r" (res) \
438 : "r" (value), "r" (addr), "i" (-EFAULT) \
439 : "memory"); \
440} while(0)
441
442#define _StoreDW(addr, value, res) \
443do { \
444 __asm__ __volatile__ ( \
445 ".set\tpush\n\t" \
446 ".set\tnoat\n\t" \
447 "1:sb\t%1, 7(%2)\n\t" \
448 "dsrl\t$1, %1, 0x8\n\t" \
449 "2:sb\t$1, 6(%2)\n\t" \
450 "dsrl\t$1, $1, 0x8\n\t" \
451 "3:sb\t$1, 5(%2)\n\t" \
452 "dsrl\t$1, $1, 0x8\n\t" \
453 "4:sb\t$1, 4(%2)\n\t" \
454 "dsrl\t$1, $1, 0x8\n\t" \
455 "5:sb\t$1, 3(%2)\n\t" \
456 "dsrl\t$1, $1, 0x8\n\t" \
457 "6:sb\t$1, 2(%2)\n\t" \
458 "dsrl\t$1, $1, 0x8\n\t" \
459 "7:sb\t$1, 1(%2)\n\t" \
460 "dsrl\t$1, $1, 0x8\n\t" \
461 "8:sb\t$1, 0(%2)\n\t" \
462 "dsrl\t$1, $1, 0x8\n\t" \
463 ".set\tpop\n\t" \
464 "li\t%0, 0\n" \
465 "10:\n\t" \
466 ".insn\n\t" \
467 ".section\t.fixup,\"ax\"\n\t" \
468 "11:\tli\t%0, %3\n\t" \
469 "j\t10b\n\t" \
470 ".previous\n\t" \
471 ".section\t__ex_table,\"a\"\n\t" \
472 STR(PTR)"\t1b, 11b\n\t" \
473 STR(PTR)"\t2b, 11b\n\t" \
474 STR(PTR)"\t3b, 11b\n\t" \
475 STR(PTR)"\t4b, 11b\n\t" \
476 STR(PTR)"\t5b, 11b\n\t" \
477 STR(PTR)"\t6b, 11b\n\t" \
478 STR(PTR)"\t7b, 11b\n\t" \
479 STR(PTR)"\t8b, 11b\n\t" \
480 ".previous" \
481 : "=&r" (res) \
482 : "r" (value), "r" (addr), "i" (-EFAULT) \
483 : "memory"); \
484} while(0)
485
486#endif
487
488#else
489
490#define _LoadHW(addr, value, res, type) \
491do { \
492 __asm__ __volatile__ (".set\tnoat\n" \
493 "1:\t"type##_lb("%0", "1(%2)")"\n" \
494 "2:\t"type##_lbu("$1", "0(%2)")"\n\t"\
495 "sll\t%0, 0x8\n\t" \
496 "or\t%0, $1\n\t" \
497 "li\t%1, 0\n" \
498 "3:\t.set\tat\n\t" \
499 ".insn\n\t" \
500 ".section\t.fixup,\"ax\"\n\t" \
501 "4:\tli\t%1, %3\n\t" \
502 "j\t3b\n\t" \
503 ".previous\n\t" \
504 ".section\t__ex_table,\"a\"\n\t" \
505 STR(PTR)"\t1b, 4b\n\t" \
506 STR(PTR)"\t2b, 4b\n\t" \
507 ".previous" \
508 : "=&r" (value), "=r" (res) \
509 : "r" (addr), "i" (-EFAULT)); \
510} while(0)
511
512#ifndef CONFIG_CPU_MIPSR6
513#define _LoadW(addr, value, res, type) \
514do { \
515 __asm__ __volatile__ ( \
516 "1:\t"type##_lwl("%0", "3(%2)")"\n" \
517 "2:\t"type##_lwr("%0", "(%2)")"\n\t"\
518 "li\t%1, 0\n" \
519 "3:\n\t" \
520 ".insn\n\t" \
521 ".section\t.fixup,\"ax\"\n\t" \
522 "4:\tli\t%1, %3\n\t" \
523 "j\t3b\n\t" \
524 ".previous\n\t" \
525 ".section\t__ex_table,\"a\"\n\t" \
526 STR(PTR)"\t1b, 4b\n\t" \
527 STR(PTR)"\t2b, 4b\n\t" \
528 ".previous" \
529 : "=&r" (value), "=r" (res) \
530 : "r" (addr), "i" (-EFAULT)); \
531} while(0)
532
533#else
534
535#define _LoadW(addr, value, res, type) \
536do { \
537 __asm__ __volatile__ ( \
538 ".set\tpush\n" \
539 ".set\tnoat\n\t" \
540 "1:"type##_lb("%0", "3(%2)")"\n\t" \
541 "2:"type##_lbu("$1", "2(%2)")"\n\t" \
542 "sll\t%0, 0x8\n\t" \
543 "or\t%0, $1\n\t" \
544 "3:"type##_lbu("$1", "1(%2)")"\n\t" \
545 "sll\t%0, 0x8\n\t" \
546 "or\t%0, $1\n\t" \
547 "4:"type##_lbu("$1", "0(%2)")"\n\t" \
548 "sll\t%0, 0x8\n\t" \
549 "or\t%0, $1\n\t" \
550 "li\t%1, 0\n" \
551 ".set\tpop\n" \
552 "10:\n\t" \
553 ".insn\n\t" \
554 ".section\t.fixup,\"ax\"\n\t" \
555 "11:\tli\t%1, %3\n\t" \
556 "j\t10b\n\t" \
557 ".previous\n\t" \
558 ".section\t__ex_table,\"a\"\n\t" \
559 STR(PTR)"\t1b, 11b\n\t" \
560 STR(PTR)"\t2b, 11b\n\t" \
561 STR(PTR)"\t3b, 11b\n\t" \
562 STR(PTR)"\t4b, 11b\n\t" \
563 ".previous" \
564 : "=&r" (value), "=r" (res) \
565 : "r" (addr), "i" (-EFAULT)); \
566} while(0)
567
568#endif
569
570
571#define _LoadHWU(addr, value, res, type) \
572do { \
573 __asm__ __volatile__ ( \
574 ".set\tnoat\n" \
575 "1:\t"type##_lbu("%0", "1(%2)")"\n" \
576 "2:\t"type##_lbu("$1", "0(%2)")"\n\t"\
577 "sll\t%0, 0x8\n\t" \
578 "or\t%0, $1\n\t" \
579 "li\t%1, 0\n" \
580 "3:\n\t" \
581 ".insn\n\t" \
582 ".set\tat\n\t" \
583 ".section\t.fixup,\"ax\"\n\t" \
584 "4:\tli\t%1, %3\n\t" \
585 "j\t3b\n\t" \
586 ".previous\n\t" \
587 ".section\t__ex_table,\"a\"\n\t" \
588 STR(PTR)"\t1b, 4b\n\t" \
589 STR(PTR)"\t2b, 4b\n\t" \
590 ".previous" \
591 : "=&r" (value), "=r" (res) \
592 : "r" (addr), "i" (-EFAULT)); \
593} while(0)
594
595#ifndef CONFIG_CPU_MIPSR6
596#define _LoadWU(addr, value, res, type) \
597do { \
598 __asm__ __volatile__ ( \
599 "1:\t"type##_lwl("%0", "3(%2)")"\n" \
600 "2:\t"type##_lwr("%0", "(%2)")"\n\t"\
601 "dsll\t%0, %0, 32\n\t" \
602 "dsrl\t%0, %0, 32\n\t" \
603 "li\t%1, 0\n" \
604 "3:\n\t" \
605 ".insn\n\t" \
606 "\t.section\t.fixup,\"ax\"\n\t" \
607 "4:\tli\t%1, %3\n\t" \
608 "j\t3b\n\t" \
609 ".previous\n\t" \
610 ".section\t__ex_table,\"a\"\n\t" \
611 STR(PTR)"\t1b, 4b\n\t" \
612 STR(PTR)"\t2b, 4b\n\t" \
613 ".previous" \
614 : "=&r" (value), "=r" (res) \
615 : "r" (addr), "i" (-EFAULT)); \
616} while(0)
617
618#define _LoadDW(addr, value, res) \
619do { \
620 __asm__ __volatile__ ( \
621 "1:\tldl\t%0, 7(%2)\n" \
622 "2:\tldr\t%0, (%2)\n\t" \
623 "li\t%1, 0\n" \
624 "3:\n\t" \
625 ".insn\n\t" \
626 "\t.section\t.fixup,\"ax\"\n\t" \
627 "4:\tli\t%1, %3\n\t" \
628 "j\t3b\n\t" \
629 ".previous\n\t" \
630 ".section\t__ex_table,\"a\"\n\t" \
631 STR(PTR)"\t1b, 4b\n\t" \
632 STR(PTR)"\t2b, 4b\n\t" \
633 ".previous" \
634 : "=&r" (value), "=r" (res) \
635 : "r" (addr), "i" (-EFAULT)); \
636} while(0)
637
638#else
639
640#define _LoadWU(addr, value, res, type) \
641do { \
642 __asm__ __volatile__ ( \
643 ".set\tpush\n\t" \
644 ".set\tnoat\n\t" \
645 "1:"type##_lbu("%0", "3(%2)")"\n\t" \
646 "2:"type##_lbu("$1", "2(%2)")"\n\t" \
647 "sll\t%0, 0x8\n\t" \
648 "or\t%0, $1\n\t" \
649 "3:"type##_lbu("$1", "1(%2)")"\n\t" \
650 "sll\t%0, 0x8\n\t" \
651 "or\t%0, $1\n\t" \
652 "4:"type##_lbu("$1", "0(%2)")"\n\t" \
653 "sll\t%0, 0x8\n\t" \
654 "or\t%0, $1\n\t" \
655 "li\t%1, 0\n" \
656 ".set\tpop\n" \
657 "10:\n\t" \
658 ".insn\n\t" \
659 ".section\t.fixup,\"ax\"\n\t" \
660 "11:\tli\t%1, %3\n\t" \
661 "j\t10b\n\t" \
662 ".previous\n\t" \
663 ".section\t__ex_table,\"a\"\n\t" \
664 STR(PTR)"\t1b, 11b\n\t" \
665 STR(PTR)"\t2b, 11b\n\t" \
666 STR(PTR)"\t3b, 11b\n\t" \
667 STR(PTR)"\t4b, 11b\n\t" \
668 ".previous" \
669 : "=&r" (value), "=r" (res) \
670 : "r" (addr), "i" (-EFAULT)); \
671} while(0)
672
673#define _LoadDW(addr, value, res) \
674do { \
675 __asm__ __volatile__ ( \
676 ".set\tpush\n\t" \
677 ".set\tnoat\n\t" \
678 "1:lb\t%0, 7(%2)\n\t" \
679 "2:lbu\t$1, 6(%2)\n\t" \
680 "dsll\t%0, 0x8\n\t" \
681 "or\t%0, $1\n\t" \
682 "3:lbu\t$1, 5(%2)\n\t" \
683 "dsll\t%0, 0x8\n\t" \
684 "or\t%0, $1\n\t" \
685 "4:lbu\t$1, 4(%2)\n\t" \
686 "dsll\t%0, 0x8\n\t" \
687 "or\t%0, $1\n\t" \
688 "5:lbu\t$1, 3(%2)\n\t" \
689 "dsll\t%0, 0x8\n\t" \
690 "or\t%0, $1\n\t" \
691 "6:lbu\t$1, 2(%2)\n\t" \
692 "dsll\t%0, 0x8\n\t" \
693 "or\t%0, $1\n\t" \
694 "7:lbu\t$1, 1(%2)\n\t" \
695 "dsll\t%0, 0x8\n\t" \
696 "or\t%0, $1\n\t" \
697 "8:lbu\t$1, 0(%2)\n\t" \
698 "dsll\t%0, 0x8\n\t" \
699 "or\t%0, $1\n\t" \
700 "li\t%1, 0\n" \
701 ".set\tpop\n\t" \
702 "10:\n\t" \
703 ".insn\n\t" \
704 ".section\t.fixup,\"ax\"\n\t" \
705 "11:\tli\t%1, %3\n\t" \
706 "j\t10b\n\t" \
707 ".previous\n\t" \
708 ".section\t__ex_table,\"a\"\n\t" \
709 STR(PTR)"\t1b, 11b\n\t" \
710 STR(PTR)"\t2b, 11b\n\t" \
711 STR(PTR)"\t3b, 11b\n\t" \
712 STR(PTR)"\t4b, 11b\n\t" \
713 STR(PTR)"\t5b, 11b\n\t" \
714 STR(PTR)"\t6b, 11b\n\t" \
715 STR(PTR)"\t7b, 11b\n\t" \
716 STR(PTR)"\t8b, 11b\n\t" \
717 ".previous" \
718 : "=&r" (value), "=r" (res) \
719 : "r" (addr), "i" (-EFAULT)); \
720} while(0)
721#endif
722
723#define _StoreHW(addr, value, res, type) \
724do { \
725 __asm__ __volatile__ ( \
726 ".set\tnoat\n" \
727 "1:\t"type##_sb("%1", "0(%2)")"\n" \
728 "srl\t$1,%1, 0x8\n" \
729 "2:\t"type##_sb("$1", "1(%2)")"\n" \
730 ".set\tat\n\t" \
731 "li\t%0, 0\n" \
732 "3:\n\t" \
733 ".insn\n\t" \
734 ".section\t.fixup,\"ax\"\n\t" \
735 "4:\tli\t%0, %3\n\t" \
736 "j\t3b\n\t" \
737 ".previous\n\t" \
738 ".section\t__ex_table,\"a\"\n\t" \
739 STR(PTR)"\t1b, 4b\n\t" \
740 STR(PTR)"\t2b, 4b\n\t" \
741 ".previous" \
742 : "=r" (res) \
743 : "r" (value), "r" (addr), "i" (-EFAULT));\
744} while(0)
745
746#ifndef CONFIG_CPU_MIPSR6
747#define _StoreW(addr, value, res, type) \
748do { \
749 __asm__ __volatile__ ( \
750 "1:\t"type##_swl("%1", "3(%2)")"\n" \
751 "2:\t"type##_swr("%1", "(%2)")"\n\t"\
752 "li\t%0, 0\n" \
753 "3:\n\t" \
754 ".insn\n\t" \
755 ".section\t.fixup,\"ax\"\n\t" \
756 "4:\tli\t%0, %3\n\t" \
757 "j\t3b\n\t" \
758 ".previous\n\t" \
759 ".section\t__ex_table,\"a\"\n\t" \
760 STR(PTR)"\t1b, 4b\n\t" \
761 STR(PTR)"\t2b, 4b\n\t" \
762 ".previous" \
763 : "=r" (res) \
764 : "r" (value), "r" (addr), "i" (-EFAULT)); \
765} while(0)
766
767#define _StoreDW(addr, value, res) \
768do { \
769 __asm__ __volatile__ ( \
770 "1:\tsdl\t%1, 7(%2)\n" \
771 "2:\tsdr\t%1, (%2)\n\t" \
772 "li\t%0, 0\n" \
773 "3:\n\t" \
774 ".insn\n\t" \
775 ".section\t.fixup,\"ax\"\n\t" \
776 "4:\tli\t%0, %3\n\t" \
777 "j\t3b\n\t" \
778 ".previous\n\t" \
779 ".section\t__ex_table,\"a\"\n\t" \
780 STR(PTR)"\t1b, 4b\n\t" \
781 STR(PTR)"\t2b, 4b\n\t" \
782 ".previous" \
783 : "=r" (res) \
784 : "r" (value), "r" (addr), "i" (-EFAULT)); \
785} while(0)
786
787#else
788
789#define _StoreW(addr, value, res, type) \
790do { \
791 __asm__ __volatile__ ( \
792 ".set\tpush\n\t" \
793 ".set\tnoat\n\t" \
794 "1:"type##_sb("%1", "0(%2)")"\n\t" \
795 "srl\t$1, %1, 0x8\n\t" \
796 "2:"type##_sb("$1", "1(%2)")"\n\t" \
797 "srl\t$1, $1, 0x8\n\t" \
798 "3:"type##_sb("$1", "2(%2)")"\n\t" \
799 "srl\t$1, $1, 0x8\n\t" \
800 "4:"type##_sb("$1", "3(%2)")"\n\t" \
801 ".set\tpop\n\t" \
802 "li\t%0, 0\n" \
803 "10:\n\t" \
804 ".insn\n\t" \
805 ".section\t.fixup,\"ax\"\n\t" \
806 "11:\tli\t%0, %3\n\t" \
807 "j\t10b\n\t" \
808 ".previous\n\t" \
809 ".section\t__ex_table,\"a\"\n\t" \
810 STR(PTR)"\t1b, 11b\n\t" \
811 STR(PTR)"\t2b, 11b\n\t" \
812 STR(PTR)"\t3b, 11b\n\t" \
813 STR(PTR)"\t4b, 11b\n\t" \
814 ".previous" \
815 : "=&r" (res) \
816 : "r" (value), "r" (addr), "i" (-EFAULT) \
817 : "memory"); \
818} while(0)
819
820#define _StoreDW(addr, value, res) \
821do { \
822 __asm__ __volatile__ ( \
823 ".set\tpush\n\t" \
824 ".set\tnoat\n\t" \
825 "1:sb\t%1, 0(%2)\n\t" \
826 "dsrl\t$1, %1, 0x8\n\t" \
827 "2:sb\t$1, 1(%2)\n\t" \
828 "dsrl\t$1, $1, 0x8\n\t" \
829 "3:sb\t$1, 2(%2)\n\t" \
830 "dsrl\t$1, $1, 0x8\n\t" \
831 "4:sb\t$1, 3(%2)\n\t" \
832 "dsrl\t$1, $1, 0x8\n\t" \
833 "5:sb\t$1, 4(%2)\n\t" \
834 "dsrl\t$1, $1, 0x8\n\t" \
835 "6:sb\t$1, 5(%2)\n\t" \
836 "dsrl\t$1, $1, 0x8\n\t" \
837 "7:sb\t$1, 6(%2)\n\t" \
838 "dsrl\t$1, $1, 0x8\n\t" \
839 "8:sb\t$1, 7(%2)\n\t" \
840 "dsrl\t$1, $1, 0x8\n\t" \
841 ".set\tpop\n\t" \
842 "li\t%0, 0\n" \
843 "10:\n\t" \
844 ".insn\n\t" \
845 ".section\t.fixup,\"ax\"\n\t" \
846 "11:\tli\t%0, %3\n\t" \
847 "j\t10b\n\t" \
848 ".previous\n\t" \
849 ".section\t__ex_table,\"a\"\n\t" \
850 STR(PTR)"\t1b, 11b\n\t" \
851 STR(PTR)"\t2b, 11b\n\t" \
852 STR(PTR)"\t3b, 11b\n\t" \
853 STR(PTR)"\t4b, 11b\n\t" \
854 STR(PTR)"\t5b, 11b\n\t" \
855 STR(PTR)"\t6b, 11b\n\t" \
856 STR(PTR)"\t7b, 11b\n\t" \
857 STR(PTR)"\t8b, 11b\n\t" \
858 ".previous" \
859 : "=&r" (res) \
860 : "r" (value), "r" (addr), "i" (-EFAULT) \
861 : "memory"); \
862} while(0)
863
864#endif
865#endif
866
867#define LoadHWU(addr, value, res) _LoadHWU(addr, value, res, kernel)
868#define LoadHWUE(addr, value, res) _LoadHWU(addr, value, res, user)
869#define LoadWU(addr, value, res) _LoadWU(addr, value, res, kernel)
870#define LoadWUE(addr, value, res) _LoadWU(addr, value, res, user)
871#define LoadHW(addr, value, res) _LoadHW(addr, value, res, kernel)
872#define LoadHWE(addr, value, res) _LoadHW(addr, value, res, user)
873#define LoadW(addr, value, res) _LoadW(addr, value, res, kernel)
874#define LoadWE(addr, value, res) _LoadW(addr, value, res, user)
875#define LoadDW(addr, value, res) _LoadDW(addr, value, res)
876
877#define StoreHW(addr, value, res) _StoreHW(addr, value, res, kernel)
878#define StoreHWE(addr, value, res) _StoreHW(addr, value, res, user)
879#define StoreW(addr, value, res) _StoreW(addr, value, res, kernel)
880#define StoreWE(addr, value, res) _StoreW(addr, value, res, user)
881#define StoreDW(addr, value, res) _StoreDW(addr, value, res)
882
883static void emulate_load_store_insn(struct pt_regs *regs,
884 void __user *addr, unsigned int __user *pc)
885{
886 union mips_instruction insn;
887 unsigned long value;
888 unsigned int res, preempted;
889 unsigned long origpc;
890 unsigned long orig31;
891 void __user *fault_addr = NULL;
892#ifdef CONFIG_EVA
893 mm_segment_t seg;
894#endif
895 union fpureg *fpr;
896 enum msa_2b_fmt df;
897 unsigned int wd;
898 origpc = (unsigned long)pc;
899 orig31 = regs->regs[31];
900
901 perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);
902
903
904
905
906 __get_user(insn.word, pc);
907
908 switch (insn.i_format.opcode) {
909
910
911
912
913
914
915 case ll_op:
916 case lld_op:
917 case sc_op:
918 case scd_op:
919
920
921
922
923
924
925 case ldl_op:
926 case ldr_op:
927 case lwl_op:
928 case lwr_op:
929 case sdl_op:
930 case sdr_op:
931 case swl_op:
932 case swr_op:
933 case lb_op:
934 case lbu_op:
935 case sb_op:
936 goto sigbus;
937
938
939
940
941
942 case spec3_op:
943 if (insn.dsp_format.func == lx_op) {
944 switch (insn.dsp_format.op) {
945 case lwx_op:
946 if (!access_ok(VERIFY_READ, addr, 4))
947 goto sigbus;
948 LoadW(addr, value, res);
949 if (res)
950 goto fault;
951 compute_return_epc(regs);
952 regs->regs[insn.dsp_format.rd] = value;
953 break;
954 case lhx_op:
955 if (!access_ok(VERIFY_READ, addr, 2))
956 goto sigbus;
957 LoadHW(addr, value, res);
958 if (res)
959 goto fault;
960 compute_return_epc(regs);
961 regs->regs[insn.dsp_format.rd] = value;
962 break;
963 default:
964 goto sigill;
965 }
966 }
967#ifdef CONFIG_EVA
968 else {
969
970
971
972
973
974 seg = get_fs();
975 set_fs(USER_DS);
976 switch (insn.spec3_format.func) {
977 case lhe_op:
978 if (!access_ok(VERIFY_READ, addr, 2)) {
979 set_fs(seg);
980 goto sigbus;
981 }
982 LoadHWE(addr, value, res);
983 if (res) {
984 set_fs(seg);
985 goto fault;
986 }
987 compute_return_epc(regs);
988 regs->regs[insn.spec3_format.rt] = value;
989 break;
990 case lwe_op:
991 if (!access_ok(VERIFY_READ, addr, 4)) {
992 set_fs(seg);
993 goto sigbus;
994 }
995 LoadWE(addr, value, res);
996 if (res) {
997 set_fs(seg);
998 goto fault;
999 }
1000 compute_return_epc(regs);
1001 regs->regs[insn.spec3_format.rt] = value;
1002 break;
1003 case lhue_op:
1004 if (!access_ok(VERIFY_READ, addr, 2)) {
1005 set_fs(seg);
1006 goto sigbus;
1007 }
1008 LoadHWUE(addr, value, res);
1009 if (res) {
1010 set_fs(seg);
1011 goto fault;
1012 }
1013 compute_return_epc(regs);
1014 regs->regs[insn.spec3_format.rt] = value;
1015 break;
1016 case she_op:
1017 if (!access_ok(VERIFY_WRITE, addr, 2)) {
1018 set_fs(seg);
1019 goto sigbus;
1020 }
1021 compute_return_epc(regs);
1022 value = regs->regs[insn.spec3_format.rt];
1023 StoreHWE(addr, value, res);
1024 if (res) {
1025 set_fs(seg);
1026 goto fault;
1027 }
1028 break;
1029 case swe_op:
1030 if (!access_ok(VERIFY_WRITE, addr, 4)) {
1031 set_fs(seg);
1032 goto sigbus;
1033 }
1034 compute_return_epc(regs);
1035 value = regs->regs[insn.spec3_format.rt];
1036 StoreWE(addr, value, res);
1037 if (res) {
1038 set_fs(seg);
1039 goto fault;
1040 }
1041 break;
1042 default:
1043 set_fs(seg);
1044 goto sigill;
1045 }
1046 set_fs(seg);
1047 }
1048#endif
1049 break;
1050 case lh_op:
1051 if (!access_ok(VERIFY_READ, addr, 2))
1052 goto sigbus;
1053
1054 if (IS_ENABLED(CONFIG_EVA)) {
1055 if (uaccess_kernel())
1056 LoadHW(addr, value, res);
1057 else
1058 LoadHWE(addr, value, res);
1059 } else {
1060 LoadHW(addr, value, res);
1061 }
1062
1063 if (res)
1064 goto fault;
1065 compute_return_epc(regs);
1066 regs->regs[insn.i_format.rt] = value;
1067 break;
1068
1069 case lw_op:
1070 if (!access_ok(VERIFY_READ, addr, 4))
1071 goto sigbus;
1072
1073 if (IS_ENABLED(CONFIG_EVA)) {
1074 if (uaccess_kernel())
1075 LoadW(addr, value, res);
1076 else
1077 LoadWE(addr, value, res);
1078 } else {
1079 LoadW(addr, value, res);
1080 }
1081
1082 if (res)
1083 goto fault;
1084 compute_return_epc(regs);
1085 regs->regs[insn.i_format.rt] = value;
1086 break;
1087
1088 case lhu_op:
1089 if (!access_ok(VERIFY_READ, addr, 2))
1090 goto sigbus;
1091
1092 if (IS_ENABLED(CONFIG_EVA)) {
1093 if (uaccess_kernel())
1094 LoadHWU(addr, value, res);
1095 else
1096 LoadHWUE(addr, value, res);
1097 } else {
1098 LoadHWU(addr, value, res);
1099 }
1100
1101 if (res)
1102 goto fault;
1103 compute_return_epc(regs);
1104 regs->regs[insn.i_format.rt] = value;
1105 break;
1106
1107 case lwu_op:
1108#ifdef CONFIG_64BIT
1109
1110
1111
1112
1113
1114
1115
1116 if (!access_ok(VERIFY_READ, addr, 4))
1117 goto sigbus;
1118
1119 LoadWU(addr, value, res);
1120 if (res)
1121 goto fault;
1122 compute_return_epc(regs);
1123 regs->regs[insn.i_format.rt] = value;
1124 break;
1125#endif
1126
1127
1128 goto sigill;
1129
1130 case ld_op:
1131#ifdef CONFIG_64BIT
1132
1133
1134
1135
1136
1137
1138
1139 if (!access_ok(VERIFY_READ, addr, 8))
1140 goto sigbus;
1141
1142 LoadDW(addr, value, res);
1143 if (res)
1144 goto fault;
1145 compute_return_epc(regs);
1146 regs->regs[insn.i_format.rt] = value;
1147 break;
1148#endif
1149
1150
1151 goto sigill;
1152
1153 case sh_op:
1154 if (!access_ok(VERIFY_WRITE, addr, 2))
1155 goto sigbus;
1156
1157 compute_return_epc(regs);
1158 value = regs->regs[insn.i_format.rt];
1159
1160 if (IS_ENABLED(CONFIG_EVA)) {
1161 if (uaccess_kernel())
1162 StoreHW(addr, value, res);
1163 else
1164 StoreHWE(addr, value, res);
1165 } else {
1166 StoreHW(addr, value, res);
1167 }
1168
1169 if (res)
1170 goto fault;
1171 break;
1172
1173 case sw_op:
1174 if (!access_ok(VERIFY_WRITE, addr, 4))
1175 goto sigbus;
1176
1177 compute_return_epc(regs);
1178 value = regs->regs[insn.i_format.rt];
1179
1180 if (IS_ENABLED(CONFIG_EVA)) {
1181 if (uaccess_kernel())
1182 StoreW(addr, value, res);
1183 else
1184 StoreWE(addr, value, res);
1185 } else {
1186 StoreW(addr, value, res);
1187 }
1188
1189 if (res)
1190 goto fault;
1191 break;
1192
1193 case sd_op:
1194#ifdef CONFIG_64BIT
1195
1196
1197
1198
1199
1200
1201
1202 if (!access_ok(VERIFY_WRITE, addr, 8))
1203 goto sigbus;
1204
1205 compute_return_epc(regs);
1206 value = regs->regs[insn.i_format.rt];
1207 StoreDW(addr, value, res);
1208 if (res)
1209 goto fault;
1210 break;
1211#endif
1212
1213
1214 goto sigill;
1215
1216 case lwc1_op:
1217 case ldc1_op:
1218 case swc1_op:
1219 case sdc1_op:
1220 case cop1x_op:
1221 die_if_kernel("Unaligned FP access in kernel code", regs);
1222 BUG_ON(!used_math());
1223
1224 lose_fpu(1);
1225 res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1,
1226 &fault_addr);
1227 own_fpu(1);
1228
1229
1230 process_fpemu_return(res, fault_addr, 0);
1231
1232 if (res == 0)
1233 break;
1234 return;
1235
1236 case msa_op:
1237 if (!cpu_has_msa)
1238 goto sigill;
1239
1240
1241
1242
1243
1244
1245 BUG_ON(!thread_msa_context_live());
1246
1247 df = insn.msa_mi10_format.df;
1248 wd = insn.msa_mi10_format.wd;
1249 fpr = ¤t->thread.fpu.fpr[wd];
1250
1251 switch (insn.msa_mi10_format.func) {
1252 case msa_ld_op:
1253 if (!access_ok(VERIFY_READ, addr, sizeof(*fpr)))
1254 goto sigbus;
1255
1256 do {
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266 preempted = test_thread_flag(TIF_USEDMSA);
1267
1268 res = __copy_from_user_inatomic(fpr, addr,
1269 sizeof(*fpr));
1270 if (res)
1271 goto fault;
1272
1273
1274
1275
1276
1277
1278
1279 preempt_disable();
1280 if (test_thread_flag(TIF_USEDMSA)) {
1281 write_msa_wr(wd, fpr, df);
1282 preempted = 0;
1283 }
1284 preempt_enable();
1285 } while (preempted);
1286 break;
1287
1288 case msa_st_op:
1289 if (!access_ok(VERIFY_WRITE, addr, sizeof(*fpr)))
1290 goto sigbus;
1291
1292
1293
1294
1295
1296
1297 preempt_disable();
1298 if (test_thread_flag(TIF_USEDMSA))
1299 read_msa_wr(wd, fpr, df);
1300 preempt_enable();
1301
1302 res = __copy_to_user_inatomic(addr, fpr, sizeof(*fpr));
1303 if (res)
1304 goto fault;
1305 break;
1306
1307 default:
1308 goto sigbus;
1309 }
1310
1311 compute_return_epc(regs);
1312 break;
1313
1314#ifndef CONFIG_CPU_MIPSR6
1315
1316
1317
1318
1319
1320
1321
1322 case lwc2_op:
1323 cu2_notifier_call_chain(CU2_LWC2_OP, regs);
1324 break;
1325
1326 case ldc2_op:
1327 cu2_notifier_call_chain(CU2_LDC2_OP, regs);
1328 break;
1329
1330 case swc2_op:
1331 cu2_notifier_call_chain(CU2_SWC2_OP, regs);
1332 break;
1333
1334 case sdc2_op:
1335 cu2_notifier_call_chain(CU2_SDC2_OP, regs);
1336 break;
1337#endif
1338 default:
1339
1340
1341
1342
1343 goto sigill;
1344 }
1345
1346#ifdef CONFIG_DEBUG_FS
1347 unaligned_instructions++;
1348#endif
1349
1350 return;
1351
1352fault:
1353
1354 regs->cp0_epc = origpc;
1355 regs->regs[31] = orig31;
1356
1357 if (fixup_exception(regs))
1358 return;
1359
1360 die_if_kernel("Unhandled kernel unaligned access", regs);
1361 force_sig(SIGSEGV, current);
1362
1363 return;
1364
1365sigbus:
1366 die_if_kernel("Unhandled kernel unaligned access", regs);
1367 force_sig(SIGBUS, current);
1368
1369 return;
1370
1371sigill:
1372 die_if_kernel
1373 ("Unhandled kernel unaligned access or invalid instruction", regs);
1374 force_sig(SIGILL, current);
1375}
1376
1377
1378const int reg16to32[] = { 16, 17, 2, 3, 4, 5, 6, 7 };
1379
1380
1381static const int reg16to32st[] = { 0, 17, 2, 3, 4, 5, 6, 7 };
1382
1383static void emulate_load_store_microMIPS(struct pt_regs *regs,
1384 void __user *addr)
1385{
1386 unsigned long value;
1387 unsigned int res;
1388 int i;
1389 unsigned int reg = 0, rvar;
1390 unsigned long orig31;
1391 u16 __user *pc16;
1392 u16 halfword;
1393 unsigned int word;
1394 unsigned long origpc, contpc;
1395 union mips_instruction insn;
1396 struct mm_decoded_insn mminsn;
1397 void __user *fault_addr = NULL;
1398
1399 origpc = regs->cp0_epc;
1400 orig31 = regs->regs[31];
1401
1402 mminsn.micro_mips_mode = 1;
1403
1404
1405
1406
1407 pc16 = (unsigned short __user *)msk_isa16_mode(regs->cp0_epc);
1408 __get_user(halfword, pc16);
1409 pc16++;
1410 contpc = regs->cp0_epc + 2;
1411 word = ((unsigned int)halfword << 16);
1412 mminsn.pc_inc = 2;
1413
1414 if (!mm_insn_16bit(halfword)) {
1415 __get_user(halfword, pc16);
1416 pc16++;
1417 contpc = regs->cp0_epc + 4;
1418 mminsn.pc_inc = 4;
1419 word |= halfword;
1420 }
1421 mminsn.insn = word;
1422
1423 if (get_user(halfword, pc16))
1424 goto fault;
1425 mminsn.next_pc_inc = 2;
1426 word = ((unsigned int)halfword << 16);
1427
1428 if (!mm_insn_16bit(halfword)) {
1429 pc16++;
1430 if (get_user(halfword, pc16))
1431 goto fault;
1432 mminsn.next_pc_inc = 4;
1433 word |= halfword;
1434 }
1435 mminsn.next_insn = word;
1436
1437 insn = (union mips_instruction)(mminsn.insn);
1438 if (mm_isBranchInstr(regs, mminsn, &contpc))
1439 insn = (union mips_instruction)(mminsn.next_insn);
1440
1441
1442
1443 switch (insn.mm_i_format.opcode) {
1444
1445 case mm_pool32a_op:
1446 switch (insn.mm_x_format.func) {
1447 case mm_lwxs_op:
1448 reg = insn.mm_x_format.rd;
1449 goto loadW;
1450 }
1451
1452 goto sigbus;
1453
1454 case mm_pool32b_op:
1455 switch (insn.mm_m_format.func) {
1456 case mm_lwp_func:
1457 reg = insn.mm_m_format.rd;
1458 if (reg == 31)
1459 goto sigbus;
1460
1461 if (!access_ok(VERIFY_READ, addr, 8))
1462 goto sigbus;
1463
1464 LoadW(addr, value, res);
1465 if (res)
1466 goto fault;
1467 regs->regs[reg] = value;
1468 addr += 4;
1469 LoadW(addr, value, res);
1470 if (res)
1471 goto fault;
1472 regs->regs[reg + 1] = value;
1473 goto success;
1474
1475 case mm_swp_func:
1476 reg = insn.mm_m_format.rd;
1477 if (reg == 31)
1478 goto sigbus;
1479
1480 if (!access_ok(VERIFY_WRITE, addr, 8))
1481 goto sigbus;
1482
1483 value = regs->regs[reg];
1484 StoreW(addr, value, res);
1485 if (res)
1486 goto fault;
1487 addr += 4;
1488 value = regs->regs[reg + 1];
1489 StoreW(addr, value, res);
1490 if (res)
1491 goto fault;
1492 goto success;
1493
1494 case mm_ldp_func:
1495#ifdef CONFIG_64BIT
1496 reg = insn.mm_m_format.rd;
1497 if (reg == 31)
1498 goto sigbus;
1499
1500 if (!access_ok(VERIFY_READ, addr, 16))
1501 goto sigbus;
1502
1503 LoadDW(addr, value, res);
1504 if (res)
1505 goto fault;
1506 regs->regs[reg] = value;
1507 addr += 8;
1508 LoadDW(addr, value, res);
1509 if (res)
1510 goto fault;
1511 regs->regs[reg + 1] = value;
1512 goto success;
1513#endif
1514
1515 goto sigill;
1516
1517 case mm_sdp_func:
1518#ifdef CONFIG_64BIT
1519 reg = insn.mm_m_format.rd;
1520 if (reg == 31)
1521 goto sigbus;
1522
1523 if (!access_ok(VERIFY_WRITE, addr, 16))
1524 goto sigbus;
1525
1526 value = regs->regs[reg];
1527 StoreDW(addr, value, res);
1528 if (res)
1529 goto fault;
1530 addr += 8;
1531 value = regs->regs[reg + 1];
1532 StoreDW(addr, value, res);
1533 if (res)
1534 goto fault;
1535 goto success;
1536#endif
1537
1538 goto sigill;
1539
1540 case mm_lwm32_func:
1541 reg = insn.mm_m_format.rd;
1542 rvar = reg & 0xf;
1543 if ((rvar > 9) || !reg)
1544 goto sigill;
1545 if (reg & 0x10) {
1546 if (!access_ok
1547 (VERIFY_READ, addr, 4 * (rvar + 1)))
1548 goto sigbus;
1549 } else {
1550 if (!access_ok(VERIFY_READ, addr, 4 * rvar))
1551 goto sigbus;
1552 }
1553 if (rvar == 9)
1554 rvar = 8;
1555 for (i = 16; rvar; rvar--, i++) {
1556 LoadW(addr, value, res);
1557 if (res)
1558 goto fault;
1559 addr += 4;
1560 regs->regs[i] = value;
1561 }
1562 if ((reg & 0xf) == 9) {
1563 LoadW(addr, value, res);
1564 if (res)
1565 goto fault;
1566 addr += 4;
1567 regs->regs[30] = value;
1568 }
1569 if (reg & 0x10) {
1570 LoadW(addr, value, res);
1571 if (res)
1572 goto fault;
1573 regs->regs[31] = value;
1574 }
1575 goto success;
1576
1577 case mm_swm32_func:
1578 reg = insn.mm_m_format.rd;
1579 rvar = reg & 0xf;
1580 if ((rvar > 9) || !reg)
1581 goto sigill;
1582 if (reg & 0x10) {
1583 if (!access_ok
1584 (VERIFY_WRITE, addr, 4 * (rvar + 1)))
1585 goto sigbus;
1586 } else {
1587 if (!access_ok(VERIFY_WRITE, addr, 4 * rvar))
1588 goto sigbus;
1589 }
1590 if (rvar == 9)
1591 rvar = 8;
1592 for (i = 16; rvar; rvar--, i++) {
1593 value = regs->regs[i];
1594 StoreW(addr, value, res);
1595 if (res)
1596 goto fault;
1597 addr += 4;
1598 }
1599 if ((reg & 0xf) == 9) {
1600 value = regs->regs[30];
1601 StoreW(addr, value, res);
1602 if (res)
1603 goto fault;
1604 addr += 4;
1605 }
1606 if (reg & 0x10) {
1607 value = regs->regs[31];
1608 StoreW(addr, value, res);
1609 if (res)
1610 goto fault;
1611 }
1612 goto success;
1613
1614 case mm_ldm_func:
1615#ifdef CONFIG_64BIT
1616 reg = insn.mm_m_format.rd;
1617 rvar = reg & 0xf;
1618 if ((rvar > 9) || !reg)
1619 goto sigill;
1620 if (reg & 0x10) {
1621 if (!access_ok
1622 (VERIFY_READ, addr, 8 * (rvar + 1)))
1623 goto sigbus;
1624 } else {
1625 if (!access_ok(VERIFY_READ, addr, 8 * rvar))
1626 goto sigbus;
1627 }
1628 if (rvar == 9)
1629 rvar = 8;
1630
1631 for (i = 16; rvar; rvar--, i++) {
1632 LoadDW(addr, value, res);
1633 if (res)
1634 goto fault;
1635 addr += 4;
1636 regs->regs[i] = value;
1637 }
1638 if ((reg & 0xf) == 9) {
1639 LoadDW(addr, value, res);
1640 if (res)
1641 goto fault;
1642 addr += 8;
1643 regs->regs[30] = value;
1644 }
1645 if (reg & 0x10) {
1646 LoadDW(addr, value, res);
1647 if (res)
1648 goto fault;
1649 regs->regs[31] = value;
1650 }
1651 goto success;
1652#endif
1653
1654 goto sigill;
1655
1656 case mm_sdm_func:
1657#ifdef CONFIG_64BIT
1658 reg = insn.mm_m_format.rd;
1659 rvar = reg & 0xf;
1660 if ((rvar > 9) || !reg)
1661 goto sigill;
1662 if (reg & 0x10) {
1663 if (!access_ok
1664 (VERIFY_WRITE, addr, 8 * (rvar + 1)))
1665 goto sigbus;
1666 } else {
1667 if (!access_ok(VERIFY_WRITE, addr, 8 * rvar))
1668 goto sigbus;
1669 }
1670 if (rvar == 9)
1671 rvar = 8;
1672
1673 for (i = 16; rvar; rvar--, i++) {
1674 value = regs->regs[i];
1675 StoreDW(addr, value, res);
1676 if (res)
1677 goto fault;
1678 addr += 8;
1679 }
1680 if ((reg & 0xf) == 9) {
1681 value = regs->regs[30];
1682 StoreDW(addr, value, res);
1683 if (res)
1684 goto fault;
1685 addr += 8;
1686 }
1687 if (reg & 0x10) {
1688 value = regs->regs[31];
1689 StoreDW(addr, value, res);
1690 if (res)
1691 goto fault;
1692 }
1693 goto success;
1694#endif
1695
1696 goto sigill;
1697
1698
1699 }
1700
1701 goto sigbus;
1702
1703 case mm_pool32c_op:
1704 switch (insn.mm_m_format.func) {
1705 case mm_lwu_func:
1706 reg = insn.mm_m_format.rd;
1707 goto loadWU;
1708 }
1709
1710
1711 goto sigbus;
1712
1713 case mm_pool32f_op:
1714 switch (insn.mm_x_format.func) {
1715 case mm_lwxc1_func:
1716 case mm_swxc1_func:
1717 case mm_ldxc1_func:
1718 case mm_sdxc1_func:
1719 goto fpu_emul;
1720 }
1721
1722 goto sigbus;
1723
1724 case mm_ldc132_op:
1725 case mm_sdc132_op:
1726 case mm_lwc132_op:
1727 case mm_swc132_op:
1728fpu_emul:
1729
1730 regs->cp0_epc = origpc;
1731 regs->regs[31] = orig31;
1732
1733 die_if_kernel("Unaligned FP access in kernel code", regs);
1734 BUG_ON(!used_math());
1735 BUG_ON(!is_fpu_owner());
1736
1737 lose_fpu(1);
1738 res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1,
1739 &fault_addr);
1740 own_fpu(1);
1741
1742
1743 process_fpemu_return(res, fault_addr, 0);
1744
1745 if (res == 0)
1746 goto success;
1747 return;
1748
1749 case mm_lh32_op:
1750 reg = insn.mm_i_format.rt;
1751 goto loadHW;
1752
1753 case mm_lhu32_op:
1754 reg = insn.mm_i_format.rt;
1755 goto loadHWU;
1756
1757 case mm_lw32_op:
1758 reg = insn.mm_i_format.rt;
1759 goto loadW;
1760
1761 case mm_sh32_op:
1762 reg = insn.mm_i_format.rt;
1763 goto storeHW;
1764
1765 case mm_sw32_op:
1766 reg = insn.mm_i_format.rt;
1767 goto storeW;
1768
1769 case mm_ld32_op:
1770 reg = insn.mm_i_format.rt;
1771 goto loadDW;
1772
1773 case mm_sd32_op:
1774 reg = insn.mm_i_format.rt;
1775 goto storeDW;
1776
1777 case mm_pool16c_op:
1778 switch (insn.mm16_m_format.func) {
1779 case mm_lwm16_op:
1780 reg = insn.mm16_m_format.rlist;
1781 rvar = reg + 1;
1782 if (!access_ok(VERIFY_READ, addr, 4 * rvar))
1783 goto sigbus;
1784
1785 for (i = 16; rvar; rvar--, i++) {
1786 LoadW(addr, value, res);
1787 if (res)
1788 goto fault;
1789 addr += 4;
1790 regs->regs[i] = value;
1791 }
1792 LoadW(addr, value, res);
1793 if (res)
1794 goto fault;
1795 regs->regs[31] = value;
1796
1797 goto success;
1798
1799 case mm_swm16_op:
1800 reg = insn.mm16_m_format.rlist;
1801 rvar = reg + 1;
1802 if (!access_ok(VERIFY_WRITE, addr, 4 * rvar))
1803 goto sigbus;
1804
1805 for (i = 16; rvar; rvar--, i++) {
1806 value = regs->regs[i];
1807 StoreW(addr, value, res);
1808 if (res)
1809 goto fault;
1810 addr += 4;
1811 }
1812 value = regs->regs[31];
1813 StoreW(addr, value, res);
1814 if (res)
1815 goto fault;
1816
1817 goto success;
1818
1819 }
1820
1821 goto sigbus;
1822
1823 case mm_lhu16_op:
1824 reg = reg16to32[insn.mm16_rb_format.rt];
1825 goto loadHWU;
1826
1827 case mm_lw16_op:
1828 reg = reg16to32[insn.mm16_rb_format.rt];
1829 goto loadW;
1830
1831 case mm_sh16_op:
1832 reg = reg16to32st[insn.mm16_rb_format.rt];
1833 goto storeHW;
1834
1835 case mm_sw16_op:
1836 reg = reg16to32st[insn.mm16_rb_format.rt];
1837 goto storeW;
1838
1839 case mm_lwsp16_op:
1840 reg = insn.mm16_r5_format.rt;
1841 goto loadW;
1842
1843 case mm_swsp16_op:
1844 reg = insn.mm16_r5_format.rt;
1845 goto storeW;
1846
1847 case mm_lwgp16_op:
1848 reg = reg16to32[insn.mm16_r3_format.rt];
1849 goto loadW;
1850
1851 default:
1852 goto sigill;
1853 }
1854
1855loadHW:
1856 if (!access_ok(VERIFY_READ, addr, 2))
1857 goto sigbus;
1858
1859 LoadHW(addr, value, res);
1860 if (res)
1861 goto fault;
1862 regs->regs[reg] = value;
1863 goto success;
1864
1865loadHWU:
1866 if (!access_ok(VERIFY_READ, addr, 2))
1867 goto sigbus;
1868
1869 LoadHWU(addr, value, res);
1870 if (res)
1871 goto fault;
1872 regs->regs[reg] = value;
1873 goto success;
1874
1875loadW:
1876 if (!access_ok(VERIFY_READ, addr, 4))
1877 goto sigbus;
1878
1879 LoadW(addr, value, res);
1880 if (res)
1881 goto fault;
1882 regs->regs[reg] = value;
1883 goto success;
1884
1885loadWU:
1886#ifdef CONFIG_64BIT
1887
1888
1889
1890
1891
1892
1893
1894 if (!access_ok(VERIFY_READ, addr, 4))
1895 goto sigbus;
1896
1897 LoadWU(addr, value, res);
1898 if (res)
1899 goto fault;
1900 regs->regs[reg] = value;
1901 goto success;
1902#endif
1903
1904
1905 goto sigill;
1906
1907loadDW:
1908#ifdef CONFIG_64BIT
1909
1910
1911
1912
1913
1914
1915
1916 if (!access_ok(VERIFY_READ, addr, 8))
1917 goto sigbus;
1918
1919 LoadDW(addr, value, res);
1920 if (res)
1921 goto fault;
1922 regs->regs[reg] = value;
1923 goto success;
1924#endif
1925
1926
1927 goto sigill;
1928
1929storeHW:
1930 if (!access_ok(VERIFY_WRITE, addr, 2))
1931 goto sigbus;
1932
1933 value = regs->regs[reg];
1934 StoreHW(addr, value, res);
1935 if (res)
1936 goto fault;
1937 goto success;
1938
1939storeW:
1940 if (!access_ok(VERIFY_WRITE, addr, 4))
1941 goto sigbus;
1942
1943 value = regs->regs[reg];
1944 StoreW(addr, value, res);
1945 if (res)
1946 goto fault;
1947 goto success;
1948
1949storeDW:
1950#ifdef CONFIG_64BIT
1951
1952
1953
1954
1955
1956
1957
1958 if (!access_ok(VERIFY_WRITE, addr, 8))
1959 goto sigbus;
1960
1961 value = regs->regs[reg];
1962 StoreDW(addr, value, res);
1963 if (res)
1964 goto fault;
1965 goto success;
1966#endif
1967
1968
1969 goto sigill;
1970
1971success:
1972 regs->cp0_epc = contpc;
1973
1974#ifdef CONFIG_DEBUG_FS
1975 unaligned_instructions++;
1976#endif
1977 return;
1978
1979fault:
1980
1981 regs->cp0_epc = origpc;
1982 regs->regs[31] = orig31;
1983
1984 if (fixup_exception(regs))
1985 return;
1986
1987 die_if_kernel("Unhandled kernel unaligned access", regs);
1988 force_sig(SIGSEGV, current);
1989
1990 return;
1991
1992sigbus:
1993 die_if_kernel("Unhandled kernel unaligned access", regs);
1994 force_sig(SIGBUS, current);
1995
1996 return;
1997
1998sigill:
1999 die_if_kernel
2000 ("Unhandled kernel unaligned access or invalid instruction", regs);
2001 force_sig(SIGILL, current);
2002}
2003
2004static void emulate_load_store_MIPS16e(struct pt_regs *regs, void __user * addr)
2005{
2006 unsigned long value;
2007 unsigned int res;
2008 int reg;
2009 unsigned long orig31;
2010 u16 __user *pc16;
2011 unsigned long origpc;
2012 union mips16e_instruction mips16inst, oldinst;
2013 unsigned int opcode;
2014 int extended = 0;
2015
2016 origpc = regs->cp0_epc;
2017 orig31 = regs->regs[31];
2018 pc16 = (unsigned short __user *)msk_isa16_mode(origpc);
2019
2020
2021
2022 __get_user(mips16inst.full, pc16);
2023 oldinst = mips16inst;
2024
2025
2026 if (mips16inst.ri.opcode == MIPS16e_extend_op) {
2027 extended = 1;
2028 pc16++;
2029 __get_user(mips16inst.full, pc16);
2030 } else if (delay_slot(regs)) {
2031
2032
2033 if (mips16inst.ri.opcode == MIPS16e_jal_op)
2034 pc16++;
2035 pc16++;
2036 if (get_user(mips16inst.full, pc16))
2037 goto sigbus;
2038 }
2039
2040 opcode = mips16inst.ri.opcode;
2041 switch (opcode) {
2042 case MIPS16e_i64_op:
2043 switch (mips16inst.i64.func) {
2044 case MIPS16e_ldpc_func:
2045 case MIPS16e_ldsp_func:
2046 reg = reg16to32[mips16inst.ri64.ry];
2047 goto loadDW;
2048
2049 case MIPS16e_sdsp_func:
2050 reg = reg16to32[mips16inst.ri64.ry];
2051 goto writeDW;
2052
2053 case MIPS16e_sdrasp_func:
2054 reg = 29;
2055 goto writeDW;
2056 }
2057
2058 goto sigbus;
2059
2060 case MIPS16e_swsp_op:
2061 reg = reg16to32[mips16inst.ri.rx];
2062 if (extended && cpu_has_mips16e2)
2063 switch (mips16inst.ri.imm >> 5) {
2064 case 0:
2065 case 1:
2066 break;
2067 case 2:
2068 opcode = MIPS16e_sh_op;
2069 break;
2070 default:
2071 goto sigbus;
2072 }
2073 break;
2074
2075 case MIPS16e_lwpc_op:
2076 reg = reg16to32[mips16inst.ri.rx];
2077 break;
2078
2079 case MIPS16e_lwsp_op:
2080 reg = reg16to32[mips16inst.ri.rx];
2081 if (extended && cpu_has_mips16e2)
2082 switch (mips16inst.ri.imm >> 5) {
2083 case 0:
2084 case 1:
2085 break;
2086 case 2:
2087 opcode = MIPS16e_lh_op;
2088 break;
2089 case 4:
2090 opcode = MIPS16e_lhu_op;
2091 break;
2092 default:
2093 goto sigbus;
2094 }
2095 break;
2096
2097 case MIPS16e_i8_op:
2098 if (mips16inst.i8.func != MIPS16e_swrasp_func)
2099 goto sigbus;
2100 reg = 29;
2101 break;
2102
2103 default:
2104 reg = reg16to32[mips16inst.rri.ry];
2105 break;
2106 }
2107
2108 switch (opcode) {
2109
2110 case MIPS16e_lb_op:
2111 case MIPS16e_lbu_op:
2112 case MIPS16e_sb_op:
2113 goto sigbus;
2114
2115 case MIPS16e_lh_op:
2116 if (!access_ok(VERIFY_READ, addr, 2))
2117 goto sigbus;
2118
2119 LoadHW(addr, value, res);
2120 if (res)
2121 goto fault;
2122 MIPS16e_compute_return_epc(regs, &oldinst);
2123 regs->regs[reg] = value;
2124 break;
2125
2126 case MIPS16e_lhu_op:
2127 if (!access_ok(VERIFY_READ, addr, 2))
2128 goto sigbus;
2129
2130 LoadHWU(addr, value, res);
2131 if (res)
2132 goto fault;
2133 MIPS16e_compute_return_epc(regs, &oldinst);
2134 regs->regs[reg] = value;
2135 break;
2136
2137 case MIPS16e_lw_op:
2138 case MIPS16e_lwpc_op:
2139 case MIPS16e_lwsp_op:
2140 if (!access_ok(VERIFY_READ, addr, 4))
2141 goto sigbus;
2142
2143 LoadW(addr, value, res);
2144 if (res)
2145 goto fault;
2146 MIPS16e_compute_return_epc(regs, &oldinst);
2147 regs->regs[reg] = value;
2148 break;
2149
2150 case MIPS16e_lwu_op:
2151#ifdef CONFIG_64BIT
2152
2153
2154
2155
2156
2157
2158
2159 if (!access_ok(VERIFY_READ, addr, 4))
2160 goto sigbus;
2161
2162 LoadWU(addr, value, res);
2163 if (res)
2164 goto fault;
2165 MIPS16e_compute_return_epc(regs, &oldinst);
2166 regs->regs[reg] = value;
2167 break;
2168#endif
2169
2170
2171 goto sigill;
2172
2173 case MIPS16e_ld_op:
2174loadDW:
2175#ifdef CONFIG_64BIT
2176
2177
2178
2179
2180
2181
2182
2183 if (!access_ok(VERIFY_READ, addr, 8))
2184 goto sigbus;
2185
2186 LoadDW(addr, value, res);
2187 if (res)
2188 goto fault;
2189 MIPS16e_compute_return_epc(regs, &oldinst);
2190 regs->regs[reg] = value;
2191 break;
2192#endif
2193
2194
2195 goto sigill;
2196
2197 case MIPS16e_sh_op:
2198 if (!access_ok(VERIFY_WRITE, addr, 2))
2199 goto sigbus;
2200
2201 MIPS16e_compute_return_epc(regs, &oldinst);
2202 value = regs->regs[reg];
2203 StoreHW(addr, value, res);
2204 if (res)
2205 goto fault;
2206 break;
2207
2208 case MIPS16e_sw_op:
2209 case MIPS16e_swsp_op:
2210 case MIPS16e_i8_op:
2211 if (!access_ok(VERIFY_WRITE, addr, 4))
2212 goto sigbus;
2213
2214 MIPS16e_compute_return_epc(regs, &oldinst);
2215 value = regs->regs[reg];
2216 StoreW(addr, value, res);
2217 if (res)
2218 goto fault;
2219 break;
2220
2221 case MIPS16e_sd_op:
2222writeDW:
2223#ifdef CONFIG_64BIT
2224
2225
2226
2227
2228
2229
2230
2231 if (!access_ok(VERIFY_WRITE, addr, 8))
2232 goto sigbus;
2233
2234 MIPS16e_compute_return_epc(regs, &oldinst);
2235 value = regs->regs[reg];
2236 StoreDW(addr, value, res);
2237 if (res)
2238 goto fault;
2239 break;
2240#endif
2241
2242
2243 goto sigill;
2244
2245 default:
2246
2247
2248
2249
2250 goto sigill;
2251 }
2252
2253#ifdef CONFIG_DEBUG_FS
2254 unaligned_instructions++;
2255#endif
2256
2257 return;
2258
2259fault:
2260
2261 regs->cp0_epc = origpc;
2262 regs->regs[31] = orig31;
2263
2264 if (fixup_exception(regs))
2265 return;
2266
2267 die_if_kernel("Unhandled kernel unaligned access", regs);
2268 force_sig(SIGSEGV, current);
2269
2270 return;
2271
2272sigbus:
2273 die_if_kernel("Unhandled kernel unaligned access", regs);
2274 force_sig(SIGBUS, current);
2275
2276 return;
2277
2278sigill:
2279 die_if_kernel
2280 ("Unhandled kernel unaligned access or invalid instruction", regs);
2281 force_sig(SIGILL, current);
2282}
2283
2284asmlinkage void do_ade(struct pt_regs *regs)
2285{
2286 enum ctx_state prev_state;
2287 unsigned int __user *pc;
2288 mm_segment_t seg;
2289
2290 prev_state = exception_enter();
2291 perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS,
2292 1, regs, regs->cp0_badvaddr);
2293
2294
2295
2296 if (regs->cp0_badvaddr == regs->cp0_epc)
2297 goto sigbus;
2298
2299 if (user_mode(regs) && !test_thread_flag(TIF_FIXADE))
2300 goto sigbus;
2301 if (unaligned_action == UNALIGNED_ACTION_SIGNAL)
2302 goto sigbus;
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312 if (get_isa16_mode(regs->cp0_epc)) {
2313
2314
2315
2316
2317 if (regs->cp0_badvaddr == msk_isa16_mode(regs->cp0_epc))
2318 goto sigbus;
2319 if (unaligned_action == UNALIGNED_ACTION_SHOW)
2320 show_registers(regs);
2321
2322 if (cpu_has_mmips) {
2323 seg = get_fs();
2324 if (!user_mode(regs))
2325 set_fs(KERNEL_DS);
2326 emulate_load_store_microMIPS(regs,
2327 (void __user *)regs->cp0_badvaddr);
2328 set_fs(seg);
2329
2330 return;
2331 }
2332
2333 if (cpu_has_mips16) {
2334 seg = get_fs();
2335 if (!user_mode(regs))
2336 set_fs(KERNEL_DS);
2337 emulate_load_store_MIPS16e(regs,
2338 (void __user *)regs->cp0_badvaddr);
2339 set_fs(seg);
2340
2341 return;
2342 }
2343
2344 goto sigbus;
2345 }
2346
2347 if (unaligned_action == UNALIGNED_ACTION_SHOW)
2348 show_registers(regs);
2349 pc = (unsigned int __user *)exception_epc(regs);
2350
2351 seg = get_fs();
2352 if (!user_mode(regs))
2353 set_fs(KERNEL_DS);
2354 emulate_load_store_insn(regs, (void __user *)regs->cp0_badvaddr, pc);
2355 set_fs(seg);
2356
2357 return;
2358
2359sigbus:
2360 die_if_kernel("Kernel unaligned instruction access", regs);
2361 force_sig(SIGBUS, current);
2362
2363
2364
2365
2366 exception_exit(prev_state);
2367}
2368
2369#ifdef CONFIG_DEBUG_FS
2370static int __init debugfs_unaligned(void)
2371{
2372 struct dentry *d;
2373
2374 if (!mips_debugfs_dir)
2375 return -ENODEV;
2376 d = debugfs_create_u32("unaligned_instructions", S_IRUGO,
2377 mips_debugfs_dir, &unaligned_instructions);
2378 if (!d)
2379 return -ENOMEM;
2380 d = debugfs_create_u32("unaligned_action", S_IRUGO | S_IWUSR,
2381 mips_debugfs_dir, &unaligned_action);
2382 if (!d)
2383 return -ENOMEM;
2384 return 0;
2385}
2386arch_initcall(debugfs_unaligned);
2387#endif
2388
