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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / arch / mips / kernel / unaligned.c
blobf1c308dbbc4a5258b17071f73de57471c6ce499e
1 /*
2 * Handle unaligned accesses by emulation.
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1996, 1998, 1999, 2002 by Ralf Baechle
9 * Copyright (C) 1999 Silicon Graphics, Inc.
10 * Copyright (C) 2014 Imagination Technologies Ltd.
11 *
12 * This file contains exception handler for address error exception with the
13 * special capability to execute faulting instructions in software. The
14 * handler does not try to handle the case when the program counter points
15 * to an address not aligned to a word boundary.
16 *
17 * Putting data to unaligned addresses is a bad practice even on Intel where
18 * only the performance is affected. Much worse is that such code is non-
19 * portable. Due to several programs that die on MIPS due to alignment
20 * problems I decided to implement this handler anyway though I originally
21 * didn't intend to do this at all for user code.
22 *
23 * For now I enable fixing of address errors by default to make life easier.
24 * I however intend to disable this somewhen in the future when the alignment
25 * problems with user programs have been fixed. For programmers this is the
26 * right way to go.
27 *
28 * Fixing address errors is a per process option. The option is inherited
29 * across fork(2) and execve(2) calls. If you really want to use the
30 * option in your user programs - I discourage the use of the software
31 * emulation strongly - use the following code in your userland stuff:
32 *
33 * #include <sys/sysmips.h>
34 *
35 * ...
36 * sysmips(MIPS_FIXADE, x);
37 * ...
38 *
39 * The argument x is 0 for disabling software emulation, enabled otherwise.
40 *
41 * Below a little program to play around with this feature.
42 *
43 * #include <stdio.h>
44 * #include <sys/sysmips.h>
45 *
46 * struct foo {
47 * unsigned char bar[8];
48 * };
49 *
50 * main(int argc, char *argv[])
51 * {
52 * struct foo x = {0, 1, 2, 3, 4, 5, 6, 7};
53 * unsigned int *p = (unsigned int *) (x.bar + 3);
54 * int i;
55 *
56 * if (argc > 1)
57 * sysmips(MIPS_FIXADE, atoi(argv[1]));
58 *
59 * printf("*p = %08lx\n", *p);
60 *
61 * *p = 0xdeadface;
62 *
63 * for(i = 0; i <= 7; i++)
64 * printf("%02x ", x.bar[i]);
65 * printf("\n");
66 * }
67 *
68 * Coprocessor loads are not supported; I think this case is unimportant
69 * in the practice.
70 *
71 * TODO: Handle ndc (attempted store to doubleword in uncached memory)
72 * exception for the R6000.
73 * A store crossing a page boundary might be executed only partially.
74 * Undo the partial store in this case.
75 */
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 <asm/uaccess.h>
93
94 #define STR(x) __STR(x)
95 #define __STR(x) #x
96
97 enum {
98 UNALIGNED_ACTION_QUIET,
99 UNALIGNED_ACTION_SIGNAL,
100 UNALIGNED_ACTION_SHOW,
101 };
102 #ifdef CONFIG_DEBUG_FS
103 static u32 unaligned_instructions;
104 static u32 unaligned_action;
105 #else
106 #define unaligned_action UNALIGNED_ACTION_QUIET
107 #endif
108 extern void show_registers(struct pt_regs *regs);
109
110 #ifdef __BIG_ENDIAN
111 #define _LoadHW(addr, value, res, type) \
112 do { \
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) \
135 do { \
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 /* MIPSR6 has no lwl instruction */
156 #define _LoadW(addr, value, res, type) \
157 do { \
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 /* CONFIG_CPU_MIPSR6 */
190
191 #define _LoadHWU(addr, value, res, type) \
192 do { \
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) \
217 do { \
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) \
239 do { \
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 /* MIPSR6 has not lwl and ldl instructions */
260 #define _LoadWU(addr, value, res, type) \
261 do { \
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) \
294 do { \
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 /* CONFIG_CPU_MIPSR6 */
343
344
345 #define _StoreHW(addr, value, res, type) \
346 do { \
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) \
370 do { \
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) \
390 do { \
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 /* MIPSR6 has no swl and sdl instructions */
411 #define _StoreW(addr, value, res, type) \
412 do { \
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) \
443 do { \
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 /* CONFIG_CPU_MIPSR6 */
487
488 #else /* __BIG_ENDIAN */
489
490 #define _LoadHW(addr, value, res, type) \
491 do { \
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) \
514 do { \
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 /* MIPSR6 has no lwl instruction */
535 #define _LoadW(addr, value, res, type) \
536 do { \
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 /* CONFIG_CPU_MIPSR6 */
569
570
571 #define _LoadHWU(addr, value, res, type) \
572 do { \
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) \
597 do { \
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) \
619 do { \
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 /* MIPSR6 has not lwl and ldl instructions */
640 #define _LoadWU(addr, value, res, type) \
641 do { \
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) \
674 do { \
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 /* CONFIG_CPU_MIPSR6 */
722
723 #define _StoreHW(addr, value, res, type) \
724 do { \
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) \
748 do { \
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) \
768 do { \
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 /* MIPSR6 has no swl and sdl instructions */
789 #define _StoreW(addr, value, res, type) \
790 do { \
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) \
821 do { \
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 /* CONFIG_CPU_MIPSR6 */
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
883 static 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 * This load never faults.
905 */
906 __get_user(insn.word, pc);
907
908 switch (insn.i_format.opcode) {
909 /*
910 * These are instructions that a compiler doesn't generate. We
911 * can assume therefore that the code is MIPS-aware and
912 * really buggy. Emulating these instructions would break the
913 * semantics anyway.
914 */
915 case ll_op:
916 case lld_op:
917 case sc_op:
918 case scd_op:
919
920 /*
921 * For these instructions the only way to create an address
922 * error is an attempted access to kernel/supervisor address
923 * space.
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 * The remaining opcodes are the ones that are really of
940 * interest.
941 */
942 #ifdef CONFIG_EVA
943 case spec3_op:
944 /*
945 * we can land here only from kernel accessing user memory,
946 * so we need to "switch" the address limit to user space, so
947 * address check can work properly.
948 */
949 seg = get_fs();
950 set_fs(USER_DS);
951 switch (insn.spec3_format.func) {
952 case lhe_op:
953 if (!access_ok(VERIFY_READ, addr, 2)) {
954 set_fs(seg);
955 goto sigbus;
956 }
957 LoadHWE(addr, value, res);
958 if (res) {
959 set_fs(seg);
960 goto fault;
961 }
962 compute_return_epc(regs);
963 regs->regs[insn.spec3_format.rt] = value;
964 break;
965 case lwe_op:
966 if (!access_ok(VERIFY_READ, addr, 4)) {
967 set_fs(seg);
968 goto sigbus;
969 }
970 LoadWE(addr, value, res);
971 if (res) {
972 set_fs(seg);
973 goto fault;
974 }
975 compute_return_epc(regs);
976 regs->regs[insn.spec3_format.rt] = value;
977 break;
978 case lhue_op:
979 if (!access_ok(VERIFY_READ, addr, 2)) {
980 set_fs(seg);
981 goto sigbus;
982 }
983 LoadHWUE(addr, value, res);
984 if (res) {
985 set_fs(seg);
986 goto fault;
987 }
988 compute_return_epc(regs);
989 regs->regs[insn.spec3_format.rt] = value;
990 break;
991 case she_op:
992 if (!access_ok(VERIFY_WRITE, addr, 2)) {
993 set_fs(seg);
994 goto sigbus;
995 }
996 compute_return_epc(regs);
997 value = regs->regs[insn.spec3_format.rt];
998 StoreHWE(addr, value, res);
999 if (res) {
1000 set_fs(seg);
1001 goto fault;
1002 }
1003 break;
1004 case swe_op:
1005 if (!access_ok(VERIFY_WRITE, addr, 4)) {
1006 set_fs(seg);
1007 goto sigbus;
1008 }
1009 compute_return_epc(regs);
1010 value = regs->regs[insn.spec3_format.rt];
1011 StoreWE(addr, value, res);
1012 if (res) {
1013 set_fs(seg);
1014 goto fault;
1015 }
1016 break;
1017 default:
1018 set_fs(seg);
1019 goto sigill;
1020 }
1021 set_fs(seg);
1022 break;
1023 #endif
1024 case lh_op:
1025 if (!access_ok(VERIFY_READ, addr, 2))
1026 goto sigbus;
1027
1028 if (IS_ENABLED(CONFIG_EVA)) {
1029 if (segment_eq(get_fs(), get_ds()))
1030 LoadHW(addr, value, res);
1031 else
1032 LoadHWE(addr, value, res);
1033 } else {
1034 LoadHW(addr, value, res);
1035 }
1036
1037 if (res)
1038 goto fault;
1039 compute_return_epc(regs);
1040 regs->regs[insn.i_format.rt] = value;
1041 break;
1042
1043 case lw_op:
1044 if (!access_ok(VERIFY_READ, addr, 4))
1045 goto sigbus;
1046
1047 if (IS_ENABLED(CONFIG_EVA)) {
1048 if (segment_eq(get_fs(), get_ds()))
1049 LoadW(addr, value, res);
1050 else
1051 LoadWE(addr, value, res);
1052 } else {
1053 LoadW(addr, value, res);
1054 }
1055
1056 if (res)
1057 goto fault;
1058 compute_return_epc(regs);
1059 regs->regs[insn.i_format.rt] = value;
1060 break;
1061
1062 case lhu_op:
1063 if (!access_ok(VERIFY_READ, addr, 2))
1064 goto sigbus;
1065
1066 if (IS_ENABLED(CONFIG_EVA)) {
1067 if (segment_eq(get_fs(), get_ds()))
1068 LoadHWU(addr, value, res);
1069 else
1070 LoadHWUE(addr, value, res);
1071 } else {
1072 LoadHWU(addr, value, res);
1073 }
1074
1075 if (res)
1076 goto fault;
1077 compute_return_epc(regs);
1078 regs->regs[insn.i_format.rt] = value;
1079 break;
1080
1081 case lwu_op:
1082 #ifdef CONFIG_64BIT
1083 /*
1084 * A 32-bit kernel might be running on a 64-bit processor. But
1085 * if we're on a 32-bit processor and an i-cache incoherency
1086 * or race makes us see a 64-bit instruction here the sdl/sdr
1087 * would blow up, so for now we don't handle unaligned 64-bit
1088 * instructions on 32-bit kernels.
1089 */
1090 if (!access_ok(VERIFY_READ, addr, 4))
1091 goto sigbus;
1092
1093 LoadWU(addr, value, res);
1094 if (res)
1095 goto fault;
1096 compute_return_epc(regs);
1097 regs->regs[insn.i_format.rt] = value;
1098 break;
1099 #endif /* CONFIG_64BIT */
1100
1101 /* Cannot handle 64-bit instructions in 32-bit kernel */
1102 goto sigill;
1103
1104 case ld_op:
1105 #ifdef CONFIG_64BIT
1106 /*
1107 * A 32-bit kernel might be running on a 64-bit processor. But
1108 * if we're on a 32-bit processor and an i-cache incoherency
1109 * or race makes us see a 64-bit instruction here the sdl/sdr
1110 * would blow up, so for now we don't handle unaligned 64-bit
1111 * instructions on 32-bit kernels.
1112 */
1113 if (!access_ok(VERIFY_READ, addr, 8))
1114 goto sigbus;
1115
1116 LoadDW(addr, value, res);
1117 if (res)
1118 goto fault;
1119 compute_return_epc(regs);
1120 regs->regs[insn.i_format.rt] = value;
1121 break;
1122 #endif /* CONFIG_64BIT */
1123
1124 /* Cannot handle 64-bit instructions in 32-bit kernel */
1125 goto sigill;
1126
1127 case sh_op:
1128 if (!access_ok(VERIFY_WRITE, addr, 2))
1129 goto sigbus;
1130
1131 compute_return_epc(regs);
1132 value = regs->regs[insn.i_format.rt];
1133
1134 if (IS_ENABLED(CONFIG_EVA)) {
1135 if (segment_eq(get_fs(), get_ds()))
1136 StoreHW(addr, value, res);
1137 else
1138 StoreHWE(addr, value, res);
1139 } else {
1140 StoreHW(addr, value, res);
1141 }
1142
1143 if (res)
1144 goto fault;
1145 break;
1146
1147 case sw_op:
1148 if (!access_ok(VERIFY_WRITE, addr, 4))
1149 goto sigbus;
1150
1151 compute_return_epc(regs);
1152 value = regs->regs[insn.i_format.rt];
1153
1154 if (IS_ENABLED(CONFIG_EVA)) {
1155 if (segment_eq(get_fs(), get_ds()))
1156 StoreW(addr, value, res);
1157 else
1158 StoreWE(addr, value, res);
1159 } else {
1160 StoreW(addr, value, res);
1161 }
1162
1163 if (res)
1164 goto fault;
1165 break;
1166
1167 case sd_op:
1168 #ifdef CONFIG_64BIT
1169 /*
1170 * A 32-bit kernel might be running on a 64-bit processor. But
1171 * if we're on a 32-bit processor and an i-cache incoherency
1172 * or race makes us see a 64-bit instruction here the sdl/sdr
1173 * would blow up, so for now we don't handle unaligned 64-bit
1174 * instructions on 32-bit kernels.
1175 */
1176 if (!access_ok(VERIFY_WRITE, addr, 8))
1177 goto sigbus;
1178
1179 compute_return_epc(regs);
1180 value = regs->regs[insn.i_format.rt];
1181 StoreDW(addr, value, res);
1182 if (res)
1183 goto fault;
1184 break;
1185 #endif /* CONFIG_64BIT */
1186
1187 /* Cannot handle 64-bit instructions in 32-bit kernel */
1188 goto sigill;
1189
1190 case lwc1_op:
1191 case ldc1_op:
1192 case swc1_op:
1193 case sdc1_op:
1194 case cop1x_op:
1195 die_if_kernel("Unaligned FP access in kernel code", regs);
1196 BUG_ON(!used_math());
1197
1198 lose_fpu(1); /* Save FPU state for the emulator. */
1199 res = fpu_emulator_cop1Handler(regs, &current->thread.fpu, 1,
1200 &fault_addr);
1201 own_fpu(1); /* Restore FPU state. */
1202
1203 /* Signal if something went wrong. */
1204 process_fpemu_return(res, fault_addr, 0);
1205
1206 if (res == 0)
1207 break;
1208 return;
1209
1210 case msa_op:
1211 if (!cpu_has_msa)
1212 goto sigill;
1213
1214 /*
1215 * If we've reached this point then userland should have taken
1216 * the MSA disabled exception & initialised vector context at
1217 * some point in the past.
1218 */
1219 BUG_ON(!thread_msa_context_live());
1220
1221 df = insn.msa_mi10_format.df;
1222 wd = insn.msa_mi10_format.wd;
1223 fpr = &current->thread.fpu.fpr[wd];
1224
1225 switch (insn.msa_mi10_format.func) {
1226 case msa_ld_op:
1227 if (!access_ok(VERIFY_READ, addr, sizeof(*fpr)))
1228 goto sigbus;
1229
1230 do {
1231 /*
1232 * If we have live MSA context keep track of
1233 * whether we get preempted in order to avoid
1234 * the register context we load being clobbered
1235 * by the live context as it's saved during
1236 * preemption. If we don't have live context
1237 * then it can't be saved to clobber the value
1238 * we load.
1239 */
1240 preempted = test_thread_flag(TIF_USEDMSA);
1241
1242 res = __copy_from_user_inatomic(fpr, addr,
1243 sizeof(*fpr));
1244 if (res)
1245 goto fault;
1246
1247 /*
1248 * Update the hardware register if it is in use
1249 * by the task in this quantum, in order to
1250 * avoid having to save & restore the whole
1251 * vector context.
1252 */
1253 preempt_disable();
1254 if (test_thread_flag(TIF_USEDMSA)) {
1255 write_msa_wr(wd, fpr, df);
1256 preempted = 0;
1257 }
1258 preempt_enable();
1259 } while (preempted);
1260 break;
1261
1262 case msa_st_op:
1263 if (!access_ok(VERIFY_WRITE, addr, sizeof(*fpr)))
1264 goto sigbus;
1265
1266 /*
1267 * Update from the hardware register if it is in use by
1268 * the task in this quantum, in order to avoid having to
1269 * save & restore the whole vector context.
1270 */
1271 preempt_disable();
1272 if (test_thread_flag(TIF_USEDMSA))
1273 read_msa_wr(wd, fpr, df);
1274 preempt_enable();
1275
1276 res = __copy_to_user_inatomic(addr, fpr, sizeof(*fpr));
1277 if (res)
1278 goto fault;
1279 break;
1280
1281 default:
1282 goto sigbus;
1283 }
1284
1285 compute_return_epc(regs);
1286 break;
1287
1288 #ifndef CONFIG_CPU_MIPSR6
1289 /*
1290 * COP2 is available to implementor for application specific use.
1291 * It's up to applications to register a notifier chain and do
1292 * whatever they have to do, including possible sending of signals.
1293 *
1294 * This instruction has been reallocated in Release 6
1295 */
1296 case lwc2_op:
1297 cu2_notifier_call_chain(CU2_LWC2_OP, regs);
1298 break;
1299
1300 case ldc2_op:
1301 cu2_notifier_call_chain(CU2_LDC2_OP, regs);
1302 break;
1303
1304 case swc2_op:
1305 cu2_notifier_call_chain(CU2_SWC2_OP, regs);
1306 break;
1307
1308 case sdc2_op:
1309 cu2_notifier_call_chain(CU2_SDC2_OP, regs);
1310 break;
1311 #endif
1312 default:
1313 /*
1314 * Pheeee... We encountered an yet unknown instruction or
1315 * cache coherence problem. Die sucker, die ...
1316 */
1317 goto sigill;
1318 }
1319
1320 #ifdef CONFIG_DEBUG_FS
1321 unaligned_instructions++;
1322 #endif
1323
1324 return;
1325
1326 fault:
1327 /* roll back jump/branch */
1328 regs->cp0_epc = origpc;
1329 regs->regs[31] = orig31;
1330 /* Did we have an exception handler installed? */
1331 if (fixup_exception(regs))
1332 return;
1333
1334 die_if_kernel("Unhandled kernel unaligned access", regs);
1335 force_sig(SIGSEGV, current);
1336
1337 return;
1338
1339 sigbus:
1340 die_if_kernel("Unhandled kernel unaligned access", regs);
1341 force_sig(SIGBUS, current);
1342
1343 return;
1344
1345 sigill:
1346 die_if_kernel
1347 ("Unhandled kernel unaligned access or invalid instruction", regs);
1348 force_sig(SIGILL, current);
1349 }
1350
1351 /* Recode table from 16-bit register notation to 32-bit GPR. */
1352 const int reg16to32[] = { 16, 17, 2, 3, 4, 5, 6, 7 };
1353
1354 /* Recode table from 16-bit STORE register notation to 32-bit GPR. */
1355 const int reg16to32st[] = { 0, 17, 2, 3, 4, 5, 6, 7 };
1356
1357 static void emulate_load_store_microMIPS(struct pt_regs *regs,
1358 void __user *addr)
1359 {
1360 unsigned long value;
1361 unsigned int res;
1362 int i;
1363 unsigned int reg = 0, rvar;
1364 unsigned long orig31;
1365 u16 __user *pc16;
1366 u16 halfword;
1367 unsigned int word;
1368 unsigned long origpc, contpc;
1369 union mips_instruction insn;
1370 struct mm_decoded_insn mminsn;
1371 void __user *fault_addr = NULL;
1372
1373 origpc = regs->cp0_epc;
1374 orig31 = regs->regs[31];
1375
1376 mminsn.micro_mips_mode = 1;
1377
1378 /*
1379 * This load never faults.
1380 */
1381 pc16 = (unsigned short __user *)msk_isa16_mode(regs->cp0_epc);
1382 __get_user(halfword, pc16);
1383 pc16++;
1384 contpc = regs->cp0_epc + 2;
1385 word = ((unsigned int)halfword << 16);
1386 mminsn.pc_inc = 2;
1387
1388 if (!mm_insn_16bit(halfword)) {
1389 __get_user(halfword, pc16);
1390 pc16++;
1391 contpc = regs->cp0_epc + 4;
1392 mminsn.pc_inc = 4;
1393 word |= halfword;
1394 }
1395 mminsn.insn = word;
1396
1397 if (get_user(halfword, pc16))
1398 goto fault;
1399 mminsn.next_pc_inc = 2;
1400 word = ((unsigned int)halfword << 16);
1401
1402 if (!mm_insn_16bit(halfword)) {
1403 pc16++;
1404 if (get_user(halfword, pc16))
1405 goto fault;
1406 mminsn.next_pc_inc = 4;
1407 word |= halfword;
1408 }
1409 mminsn.next_insn = word;
1410
1411 insn = (union mips_instruction)(mminsn.insn);
1412 if (mm_isBranchInstr(regs, mminsn, &contpc))
1413 insn = (union mips_instruction)(mminsn.next_insn);
1414
1415 /* Parse instruction to find what to do */
1416
1417 switch (insn.mm_i_format.opcode) {
1418
1419 case mm_pool32a_op:
1420 switch (insn.mm_x_format.func) {
1421 case mm_lwxs_op:
1422 reg = insn.mm_x_format.rd;
1423 goto loadW;
1424 }
1425
1426 goto sigbus;
1427
1428 case mm_pool32b_op:
1429 switch (insn.mm_m_format.func) {
1430 case mm_lwp_func:
1431 reg = insn.mm_m_format.rd;
1432 if (reg == 31)
1433 goto sigbus;
1434
1435 if (!access_ok(VERIFY_READ, addr, 8))
1436 goto sigbus;
1437
1438 LoadW(addr, value, res);
1439 if (res)
1440 goto fault;
1441 regs->regs[reg] = value;
1442 addr += 4;
1443 LoadW(addr, value, res);
1444 if (res)
1445 goto fault;
1446 regs->regs[reg + 1] = value;
1447 goto success;
1448
1449 case mm_swp_func:
1450 reg = insn.mm_m_format.rd;
1451 if (reg == 31)
1452 goto sigbus;
1453
1454 if (!access_ok(VERIFY_WRITE, addr, 8))
1455 goto sigbus;
1456
1457 value = regs->regs[reg];
1458 StoreW(addr, value, res);
1459 if (res)
1460 goto fault;
1461 addr += 4;
1462 value = regs->regs[reg + 1];
1463 StoreW(addr, value, res);
1464 if (res)
1465 goto fault;
1466 goto success;
1467
1468 case mm_ldp_func:
1469 #ifdef CONFIG_64BIT
1470 reg = insn.mm_m_format.rd;
1471 if (reg == 31)
1472 goto sigbus;
1473
1474 if (!access_ok(VERIFY_READ, addr, 16))
1475 goto sigbus;
1476
1477 LoadDW(addr, value, res);
1478 if (res)
1479 goto fault;
1480 regs->regs[reg] = value;
1481 addr += 8;
1482 LoadDW(addr, value, res);
1483 if (res)
1484 goto fault;
1485 regs->regs[reg + 1] = value;
1486 goto success;
1487 #endif /* CONFIG_64BIT */
1488
1489 goto sigill;
1490
1491 case mm_sdp_func:
1492 #ifdef CONFIG_64BIT
1493 reg = insn.mm_m_format.rd;
1494 if (reg == 31)
1495 goto sigbus;
1496
1497 if (!access_ok(VERIFY_WRITE, addr, 16))
1498 goto sigbus;
1499
1500 value = regs->regs[reg];
1501 StoreDW(addr, value, res);
1502 if (res)
1503 goto fault;
1504 addr += 8;
1505 value = regs->regs[reg + 1];
1506 StoreDW(addr, value, res);
1507 if (res)
1508 goto fault;
1509 goto success;
1510 #endif /* CONFIG_64BIT */
1511
1512 goto sigill;
1513
1514 case mm_lwm32_func:
1515 reg = insn.mm_m_format.rd;
1516 rvar = reg & 0xf;
1517 if ((rvar > 9) || !reg)
1518 goto sigill;
1519 if (reg & 0x10) {
1520 if (!access_ok
1521 (VERIFY_READ, addr, 4 * (rvar + 1)))
1522 goto sigbus;
1523 } else {
1524 if (!access_ok(VERIFY_READ, addr, 4 * rvar))
1525 goto sigbus;
1526 }
1527 if (rvar == 9)
1528 rvar = 8;
1529 for (i = 16; rvar; rvar--, i++) {
1530 LoadW(addr, value, res);
1531 if (res)
1532 goto fault;
1533 addr += 4;
1534 regs->regs[i] = value;
1535 }
1536 if ((reg & 0xf) == 9) {
1537 LoadW(addr, value, res);
1538 if (res)
1539 goto fault;
1540 addr += 4;
1541 regs->regs[30] = value;
1542 }
1543 if (reg & 0x10) {
1544 LoadW(addr, value, res);
1545 if (res)
1546 goto fault;
1547 regs->regs[31] = value;
1548 }
1549 goto success;
1550
1551 case mm_swm32_func:
1552 reg = insn.mm_m_format.rd;
1553 rvar = reg & 0xf;
1554 if ((rvar > 9) || !reg)
1555 goto sigill;
1556 if (reg & 0x10) {
1557 if (!access_ok
1558 (VERIFY_WRITE, addr, 4 * (rvar + 1)))
1559 goto sigbus;
1560 } else {
1561 if (!access_ok(VERIFY_WRITE, addr, 4 * rvar))
1562 goto sigbus;
1563 }
1564 if (rvar == 9)
1565 rvar = 8;
1566 for (i = 16; rvar; rvar--, i++) {
1567 value = regs->regs[i];
1568 StoreW(addr, value, res);
1569 if (res)
1570 goto fault;
1571 addr += 4;
1572 }
1573 if ((reg & 0xf) == 9) {
1574 value = regs->regs[30];
1575 StoreW(addr, value, res);
1576 if (res)
1577 goto fault;
1578 addr += 4;
1579 }
1580 if (reg & 0x10) {
1581 value = regs->regs[31];
1582 StoreW(addr, value, res);
1583 if (res)
1584 goto fault;
1585 }
1586 goto success;
1587
1588 case mm_ldm_func:
1589 #ifdef CONFIG_64BIT
1590 reg = insn.mm_m_format.rd;
1591 rvar = reg & 0xf;
1592 if ((rvar > 9) || !reg)
1593 goto sigill;
1594 if (reg & 0x10) {
1595 if (!access_ok
1596 (VERIFY_READ, addr, 8 * (rvar + 1)))
1597 goto sigbus;
1598 } else {
1599 if (!access_ok(VERIFY_READ, addr, 8 * rvar))
1600 goto sigbus;
1601 }
1602 if (rvar == 9)
1603 rvar = 8;
1604
1605 for (i = 16; rvar; rvar--, i++) {
1606 LoadDW(addr, value, res);
1607 if (res)
1608 goto fault;
1609 addr += 4;
1610 regs->regs[i] = value;
1611 }
1612 if ((reg & 0xf) == 9) {
1613 LoadDW(addr, value, res);
1614 if (res)
1615 goto fault;
1616 addr += 8;
1617 regs->regs[30] = value;
1618 }
1619 if (reg & 0x10) {
1620 LoadDW(addr, value, res);
1621 if (res)
1622 goto fault;
1623 regs->regs[31] = value;
1624 }
1625 goto success;
1626 #endif /* CONFIG_64BIT */
1627
1628 goto sigill;
1629
1630 case mm_sdm_func:
1631 #ifdef CONFIG_64BIT
1632 reg = insn.mm_m_format.rd;
1633 rvar = reg & 0xf;
1634 if ((rvar > 9) || !reg)
1635 goto sigill;
1636 if (reg & 0x10) {
1637 if (!access_ok
1638 (VERIFY_WRITE, addr, 8 * (rvar + 1)))
1639 goto sigbus;
1640 } else {
1641 if (!access_ok(VERIFY_WRITE, addr, 8 * rvar))
1642 goto sigbus;
1643 }
1644 if (rvar == 9)
1645 rvar = 8;
1646
1647 for (i = 16; rvar; rvar--, i++) {
1648 value = regs->regs[i];
1649 StoreDW(addr, value, res);
1650 if (res)
1651 goto fault;
1652 addr += 8;
1653 }
1654 if ((reg & 0xf) == 9) {
1655 value = regs->regs[30];
1656 StoreDW(addr, value, res);
1657 if (res)
1658 goto fault;
1659 addr += 8;
1660 }
1661 if (reg & 0x10) {
1662 value = regs->regs[31];
1663 StoreDW(addr, value, res);
1664 if (res)
1665 goto fault;
1666 }
1667 goto success;
1668 #endif /* CONFIG_64BIT */
1669
1670 goto sigill;
1671
1672 /* LWC2, SWC2, LDC2, SDC2 are not serviced */
1673 }
1674
1675 goto sigbus;
1676
1677 case mm_pool32c_op:
1678 switch (insn.mm_m_format.func) {
1679 case mm_lwu_func:
1680 reg = insn.mm_m_format.rd;
1681 goto loadWU;
1682 }
1683
1684 /* LL,SC,LLD,SCD are not serviced */
1685 goto sigbus;
1686
1687 case mm_pool32f_op:
1688 switch (insn.mm_x_format.func) {
1689 case mm_lwxc1_func:
1690 case mm_swxc1_func:
1691 case mm_ldxc1_func:
1692 case mm_sdxc1_func:
1693 goto fpu_emul;
1694 }
1695
1696 goto sigbus;
1697
1698 case mm_ldc132_op:
1699 case mm_sdc132_op:
1700 case mm_lwc132_op:
1701 case mm_swc132_op:
1702 fpu_emul:
1703 /* roll back jump/branch */
1704 regs->cp0_epc = origpc;
1705 regs->regs[31] = orig31;
1706
1707 die_if_kernel("Unaligned FP access in kernel code", regs);
1708 BUG_ON(!used_math());
1709 BUG_ON(!is_fpu_owner());
1710
1711 lose_fpu(1); /* save the FPU state for the emulator */
1712 res = fpu_emulator_cop1Handler(regs, &current->thread.fpu, 1,
1713 &fault_addr);
1714 own_fpu(1); /* restore FPU state */
1715
1716 /* If something went wrong, signal */
1717 process_fpemu_return(res, fault_addr, 0);
1718
1719 if (res == 0)
1720 goto success;
1721 return;
1722
1723 case mm_lh32_op:
1724 reg = insn.mm_i_format.rt;
1725 goto loadHW;
1726
1727 case mm_lhu32_op:
1728 reg = insn.mm_i_format.rt;
1729 goto loadHWU;
1730
1731 case mm_lw32_op:
1732 reg = insn.mm_i_format.rt;
1733 goto loadW;
1734
1735 case mm_sh32_op:
1736 reg = insn.mm_i_format.rt;
1737 goto storeHW;
1738
1739 case mm_sw32_op:
1740 reg = insn.mm_i_format.rt;
1741 goto storeW;
1742
1743 case mm_ld32_op:
1744 reg = insn.mm_i_format.rt;
1745 goto loadDW;
1746
1747 case mm_sd32_op:
1748 reg = insn.mm_i_format.rt;
1749 goto storeDW;
1750
1751 case mm_pool16c_op:
1752 switch (insn.mm16_m_format.func) {
1753 case mm_lwm16_op:
1754 reg = insn.mm16_m_format.rlist;
1755 rvar = reg + 1;
1756 if (!access_ok(VERIFY_READ, addr, 4 * rvar))
1757 goto sigbus;
1758
1759 for (i = 16; rvar; rvar--, i++) {
1760 LoadW(addr, value, res);
1761 if (res)
1762 goto fault;
1763 addr += 4;
1764 regs->regs[i] = value;
1765 }
1766 LoadW(addr, value, res);
1767 if (res)
1768 goto fault;
1769 regs->regs[31] = value;
1770
1771 goto success;
1772
1773 case mm_swm16_op:
1774 reg = insn.mm16_m_format.rlist;
1775 rvar = reg + 1;
1776 if (!access_ok(VERIFY_WRITE, addr, 4 * rvar))
1777 goto sigbus;
1778
1779 for (i = 16; rvar; rvar--, i++) {
1780 value = regs->regs[i];
1781 StoreW(addr, value, res);
1782 if (res)
1783 goto fault;
1784 addr += 4;
1785 }
1786 value = regs->regs[31];
1787 StoreW(addr, value, res);
1788 if (res)
1789 goto fault;
1790
1791 goto success;
1792
1793 }
1794
1795 goto sigbus;
1796
1797 case mm_lhu16_op:
1798 reg = reg16to32[insn.mm16_rb_format.rt];
1799 goto loadHWU;
1800
1801 case mm_lw16_op:
1802 reg = reg16to32[insn.mm16_rb_format.rt];
1803 goto loadW;
1804
1805 case mm_sh16_op:
1806 reg = reg16to32st[insn.mm16_rb_format.rt];
1807 goto storeHW;
1808
1809 case mm_sw16_op:
1810 reg = reg16to32st[insn.mm16_rb_format.rt];
1811 goto storeW;
1812
1813 case mm_lwsp16_op:
1814 reg = insn.mm16_r5_format.rt;
1815 goto loadW;
1816
1817 case mm_swsp16_op:
1818 reg = insn.mm16_r5_format.rt;
1819 goto storeW;
1820
1821 case mm_lwgp16_op:
1822 reg = reg16to32[insn.mm16_r3_format.rt];
1823 goto loadW;
1824
1825 default:
1826 goto sigill;
1827 }
1828
1829 loadHW:
1830 if (!access_ok(VERIFY_READ, addr, 2))
1831 goto sigbus;
1832
1833 LoadHW(addr, value, res);
1834 if (res)
1835 goto fault;
1836 regs->regs[reg] = value;
1837 goto success;
1838
1839 loadHWU:
1840 if (!access_ok(VERIFY_READ, addr, 2))
1841 goto sigbus;
1842
1843 LoadHWU(addr, value, res);
1844 if (res)
1845 goto fault;
1846 regs->regs[reg] = value;
1847 goto success;
1848
1849 loadW:
1850 if (!access_ok(VERIFY_READ, addr, 4))
1851 goto sigbus;
1852
1853 LoadW(addr, value, res);
1854 if (res)
1855 goto fault;
1856 regs->regs[reg] = value;
1857 goto success;
1858
1859 loadWU:
1860 #ifdef CONFIG_64BIT
1861 /*
1862 * A 32-bit kernel might be running on a 64-bit processor. But
1863 * if we're on a 32-bit processor and an i-cache incoherency
1864 * or race makes us see a 64-bit instruction here the sdl/sdr
1865 * would blow up, so for now we don't handle unaligned 64-bit
1866 * instructions on 32-bit kernels.
1867 */
1868 if (!access_ok(VERIFY_READ, addr, 4))
1869 goto sigbus;
1870
1871 LoadWU(addr, value, res);
1872 if (res)
1873 goto fault;
1874 regs->regs[reg] = value;
1875 goto success;
1876 #endif /* CONFIG_64BIT */
1877
1878 /* Cannot handle 64-bit instructions in 32-bit kernel */
1879 goto sigill;
1880
1881 loadDW:
1882 #ifdef CONFIG_64BIT
1883 /*
1884 * A 32-bit kernel might be running on a 64-bit processor. But
1885 * if we're on a 32-bit processor and an i-cache incoherency
1886 * or race makes us see a 64-bit instruction here the sdl/sdr
1887 * would blow up, so for now we don't handle unaligned 64-bit
1888 * instructions on 32-bit kernels.
1889 */
1890 if (!access_ok(VERIFY_READ, addr, 8))
1891 goto sigbus;
1892
1893 LoadDW(addr, value, res);
1894 if (res)
1895 goto fault;
1896 regs->regs[reg] = value;
1897 goto success;
1898 #endif /* CONFIG_64BIT */
1899
1900 /* Cannot handle 64-bit instructions in 32-bit kernel */
1901 goto sigill;
1902
1903 storeHW:
1904 if (!access_ok(VERIFY_WRITE, addr, 2))
1905 goto sigbus;
1906
1907 value = regs->regs[reg];
1908 StoreHW(addr, value, res);
1909 if (res)
1910 goto fault;
1911 goto success;
1912
1913 storeW:
1914 if (!access_ok(VERIFY_WRITE, addr, 4))
1915 goto sigbus;
1916
1917 value = regs->regs[reg];
1918 StoreW(addr, value, res);
1919 if (res)
1920 goto fault;
1921 goto success;
1922
1923 storeDW:
1924 #ifdef CONFIG_64BIT
1925 /*
1926 * A 32-bit kernel might be running on a 64-bit processor. But
1927 * if we're on a 32-bit processor and an i-cache incoherency
1928 * or race makes us see a 64-bit instruction here the sdl/sdr
1929 * would blow up, so for now we don't handle unaligned 64-bit
1930 * instructions on 32-bit kernels.
1931 */
1932 if (!access_ok(VERIFY_WRITE, addr, 8))
1933 goto sigbus;
1934
1935 value = regs->regs[reg];
1936 StoreDW(addr, value, res);
1937 if (res)
1938 goto fault;
1939 goto success;
1940 #endif /* CONFIG_64BIT */
1941
1942 /* Cannot handle 64-bit instructions in 32-bit kernel */
1943 goto sigill;
1944
1945 success:
1946 regs->cp0_epc = contpc; /* advance or branch */
1947
1948 #ifdef CONFIG_DEBUG_FS
1949 unaligned_instructions++;
1950 #endif
1951 return;
1952
1953 fault:
1954 /* roll back jump/branch */
1955 regs->cp0_epc = origpc;
1956 regs->regs[31] = orig31;
1957 /* Did we have an exception handler installed? */
1958 if (fixup_exception(regs))
1959 return;
1960
1961 die_if_kernel("Unhandled kernel unaligned access", regs);
1962 force_sig(SIGSEGV, current);
1963
1964 return;
1965
1966 sigbus:
1967 die_if_kernel("Unhandled kernel unaligned access", regs);
1968 force_sig(SIGBUS, current);
1969
1970 return;
1971
1972 sigill:
1973 die_if_kernel
1974 ("Unhandled kernel unaligned access or invalid instruction", regs);
1975 force_sig(SIGILL, current);
1976 }
1977
1978 static void emulate_load_store_MIPS16e(struct pt_regs *regs, void __user * addr)
1979 {
1980 unsigned long value;
1981 unsigned int res;
1982 int reg;
1983 unsigned long orig31;
1984 u16 __user *pc16;
1985 unsigned long origpc;
1986 union mips16e_instruction mips16inst, oldinst;
1987
1988 origpc = regs->cp0_epc;
1989 orig31 = regs->regs[31];
1990 pc16 = (unsigned short __user *)msk_isa16_mode(origpc);
1991 /*
1992 * This load never faults.
1993 */
1994 __get_user(mips16inst.full, pc16);
1995 oldinst = mips16inst;
1996
1997 /* skip EXTEND instruction */
1998 if (mips16inst.ri.opcode == MIPS16e_extend_op) {
1999 pc16++;
2000 __get_user(mips16inst.full, pc16);
2001 } else if (delay_slot(regs)) {
2002 /* skip jump instructions */
2003 /* JAL/JALX are 32 bits but have OPCODE in first short int */
2004 if (mips16inst.ri.opcode == MIPS16e_jal_op)
2005 pc16++;
2006 pc16++;
2007 if (get_user(mips16inst.full, pc16))
2008 goto sigbus;
2009 }
2010
2011 switch (mips16inst.ri.opcode) {
2012 case MIPS16e_i64_op: /* I64 or RI64 instruction */
2013 switch (mips16inst.i64.func) { /* I64/RI64 func field check */
2014 case MIPS16e_ldpc_func:
2015 case MIPS16e_ldsp_func:
2016 reg = reg16to32[mips16inst.ri64.ry];
2017 goto loadDW;
2018
2019 case MIPS16e_sdsp_func:
2020 reg = reg16to32[mips16inst.ri64.ry];
2021 goto writeDW;
2022
2023 case MIPS16e_sdrasp_func:
2024 reg = 29; /* GPRSP */
2025 goto writeDW;
2026 }
2027
2028 goto sigbus;
2029
2030 case MIPS16e_swsp_op:
2031 case MIPS16e_lwpc_op:
2032 case MIPS16e_lwsp_op:
2033 reg = reg16to32[mips16inst.ri.rx];
2034 break;
2035
2036 case MIPS16e_i8_op:
2037 if (mips16inst.i8.func != MIPS16e_swrasp_func)
2038 goto sigbus;
2039 reg = 29; /* GPRSP */
2040 break;
2041
2042 default:
2043 reg = reg16to32[mips16inst.rri.ry];
2044 break;
2045 }
2046
2047 switch (mips16inst.ri.opcode) {
2048
2049 case MIPS16e_lb_op:
2050 case MIPS16e_lbu_op:
2051 case MIPS16e_sb_op:
2052 goto sigbus;
2053
2054 case MIPS16e_lh_op:
2055 if (!access_ok(VERIFY_READ, addr, 2))
2056 goto sigbus;
2057
2058 LoadHW(addr, value, res);
2059 if (res)
2060 goto fault;
2061 MIPS16e_compute_return_epc(regs, &oldinst);
2062 regs->regs[reg] = value;
2063 break;
2064
2065 case MIPS16e_lhu_op:
2066 if (!access_ok(VERIFY_READ, addr, 2))
2067 goto sigbus;
2068
2069 LoadHWU(addr, value, res);
2070 if (res)
2071 goto fault;
2072 MIPS16e_compute_return_epc(regs, &oldinst);
2073 regs->regs[reg] = value;
2074 break;
2075
2076 case MIPS16e_lw_op:
2077 case MIPS16e_lwpc_op:
2078 case MIPS16e_lwsp_op:
2079 if (!access_ok(VERIFY_READ, addr, 4))
2080 goto sigbus;
2081
2082 LoadW(addr, value, res);
2083 if (res)
2084 goto fault;
2085 MIPS16e_compute_return_epc(regs, &oldinst);
2086 regs->regs[reg] = value;
2087 break;
2088
2089 case MIPS16e_lwu_op:
2090 #ifdef CONFIG_64BIT
2091 /*
2092 * A 32-bit kernel might be running on a 64-bit processor. But
2093 * if we're on a 32-bit processor and an i-cache incoherency
2094 * or race makes us see a 64-bit instruction here the sdl/sdr
2095 * would blow up, so for now we don't handle unaligned 64-bit
2096 * instructions on 32-bit kernels.
2097 */
2098 if (!access_ok(VERIFY_READ, addr, 4))
2099 goto sigbus;
2100
2101 LoadWU(addr, value, res);
2102 if (res)
2103 goto fault;
2104 MIPS16e_compute_return_epc(regs, &oldinst);
2105 regs->regs[reg] = value;
2106 break;
2107 #endif /* CONFIG_64BIT */
2108
2109 /* Cannot handle 64-bit instructions in 32-bit kernel */
2110 goto sigill;
2111
2112 case MIPS16e_ld_op:
2113 loadDW:
2114 #ifdef CONFIG_64BIT
2115 /*
2116 * A 32-bit kernel might be running on a 64-bit processor. But
2117 * if we're on a 32-bit processor and an i-cache incoherency
2118 * or race makes us see a 64-bit instruction here the sdl/sdr
2119 * would blow up, so for now we don't handle unaligned 64-bit
2120 * instructions on 32-bit kernels.
2121 */
2122 if (!access_ok(VERIFY_READ, addr, 8))
2123 goto sigbus;
2124
2125 LoadDW(addr, value, res);
2126 if (res)
2127 goto fault;
2128 MIPS16e_compute_return_epc(regs, &oldinst);
2129 regs->regs[reg] = value;
2130 break;
2131 #endif /* CONFIG_64BIT */
2132
2133 /* Cannot handle 64-bit instructions in 32-bit kernel */
2134 goto sigill;
2135
2136 case MIPS16e_sh_op:
2137 if (!access_ok(VERIFY_WRITE, addr, 2))
2138 goto sigbus;
2139
2140 MIPS16e_compute_return_epc(regs, &oldinst);
2141 value = regs->regs[reg];
2142 StoreHW(addr, value, res);
2143 if (res)
2144 goto fault;
2145 break;
2146
2147 case MIPS16e_sw_op:
2148 case MIPS16e_swsp_op:
2149 case MIPS16e_i8_op: /* actually - MIPS16e_swrasp_func */
2150 if (!access_ok(VERIFY_WRITE, addr, 4))
2151 goto sigbus;
2152
2153 MIPS16e_compute_return_epc(regs, &oldinst);
2154 value = regs->regs[reg];
2155 StoreW(addr, value, res);
2156 if (res)
2157 goto fault;
2158 break;
2159
2160 case MIPS16e_sd_op:
2161 writeDW:
2162 #ifdef CONFIG_64BIT
2163 /*
2164 * A 32-bit kernel might be running on a 64-bit processor. But
2165 * if we're on a 32-bit processor and an i-cache incoherency
2166 * or race makes us see a 64-bit instruction here the sdl/sdr
2167 * would blow up, so for now we don't handle unaligned 64-bit
2168 * instructions on 32-bit kernels.
2169 */
2170 if (!access_ok(VERIFY_WRITE, addr, 8))
2171 goto sigbus;
2172
2173 MIPS16e_compute_return_epc(regs, &oldinst);
2174 value = regs->regs[reg];
2175 StoreDW(addr, value, res);
2176 if (res)
2177 goto fault;
2178 break;
2179 #endif /* CONFIG_64BIT */
2180
2181 /* Cannot handle 64-bit instructions in 32-bit kernel */
2182 goto sigill;
2183
2184 default:
2185 /*
2186 * Pheeee... We encountered an yet unknown instruction or
2187 * cache coherence problem. Die sucker, die ...
2188 */
2189 goto sigill;
2190 }
2191
2192 #ifdef CONFIG_DEBUG_FS
2193 unaligned_instructions++;
2194 #endif
2195
2196 return;
2197
2198 fault:
2199 /* roll back jump/branch */
2200 regs->cp0_epc = origpc;
2201 regs->regs[31] = orig31;
2202 /* Did we have an exception handler installed? */
2203 if (fixup_exception(regs))
2204 return;
2205
2206 die_if_kernel("Unhandled kernel unaligned access", regs);
2207 force_sig(SIGSEGV, current);
2208
2209 return;
2210
2211 sigbus:
2212 die_if_kernel("Unhandled kernel unaligned access", regs);
2213 force_sig(SIGBUS, current);
2214
2215 return;
2216
2217 sigill:
2218 die_if_kernel
2219 ("Unhandled kernel unaligned access or invalid instruction", regs);
2220 force_sig(SIGILL, current);
2221 }
2222
2223 asmlinkage void do_ade(struct pt_regs *regs)
2224 {
2225 enum ctx_state prev_state;
2226 unsigned int __user *pc;
2227 mm_segment_t seg;
2228
2229 prev_state = exception_enter();
2230 perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS,
2231 1, regs, regs->cp0_badvaddr);
2232 /*
2233 * Did we catch a fault trying to load an instruction?
2234 */
2235 if (regs->cp0_badvaddr == regs->cp0_epc)
2236 goto sigbus;
2237
2238 if (user_mode(regs) && !test_thread_flag(TIF_FIXADE))
2239 goto sigbus;
2240 if (unaligned_action == UNALIGNED_ACTION_SIGNAL)
2241 goto sigbus;
2242
2243 /*
2244 * Do branch emulation only if we didn't forward the exception.
2245 * This is all so but ugly ...
2246 */
2247
2248 /*
2249 * Are we running in microMIPS mode?
2250 */
2251 if (get_isa16_mode(regs->cp0_epc)) {
2252 /*
2253 * Did we catch a fault trying to load an instruction in
2254 * 16-bit mode?
2255 */
2256 if (regs->cp0_badvaddr == msk_isa16_mode(regs->cp0_epc))
2257 goto sigbus;
2258 if (unaligned_action == UNALIGNED_ACTION_SHOW)
2259 show_registers(regs);
2260
2261 if (cpu_has_mmips) {
2262 seg = get_fs();
2263 if (!user_mode(regs))
2264 set_fs(KERNEL_DS);
2265 emulate_load_store_microMIPS(regs,
2266 (void __user *)regs->cp0_badvaddr);
2267 set_fs(seg);
2268
2269 return;
2270 }
2271
2272 if (cpu_has_mips16) {
2273 seg = get_fs();
2274 if (!user_mode(regs))
2275 set_fs(KERNEL_DS);
2276 emulate_load_store_MIPS16e(regs,
2277 (void __user *)regs->cp0_badvaddr);
2278 set_fs(seg);
2279
2280 return;
2281 }
2282
2283 goto sigbus;
2284 }
2285
2286 if (unaligned_action == UNALIGNED_ACTION_SHOW)
2287 show_registers(regs);
2288 pc = (unsigned int __user *)exception_epc(regs);
2289
2290 seg = get_fs();
2291 if (!user_mode(regs))
2292 set_fs(KERNEL_DS);
2293 emulate_load_store_insn(regs, (void __user *)regs->cp0_badvaddr, pc);
2294 set_fs(seg);
2295
2296 return;
2297
2298 sigbus:
2299 die_if_kernel("Kernel unaligned instruction access", regs);
2300 force_sig(SIGBUS, current);
2301
2302 /*
2303 * XXX On return from the signal handler we should advance the epc
2304 */
2305 exception_exit(prev_state);
2306 }
2307
2308 #ifdef CONFIG_DEBUG_FS
2309 static int __init debugfs_unaligned(void)
2310 {
2311 struct dentry *d;
2312
2313 if (!mips_debugfs_dir)
2314 return -ENODEV;
2315 d = debugfs_create_u32("unaligned_instructions", S_IRUGO,
2316 mips_debugfs_dir, &unaligned_instructions);
2317 if (!d)
2318 return -ENOMEM;
2319 d = debugfs_create_u32("unaligned_action", S_IRUGO | S_IWUSR,
2320 mips_debugfs_dir, &unaligned_action);
2321 if (!d)
2322 return -ENOMEM;
2323 return 0;
2324 }
2325 arch_initcall(debugfs_unaligned);
2326 #endif
CRIS linux kernel tree