Commit | Line | Data |
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1da177e4 LT |
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 | * | |
11 | * This file contains exception handler for address error exception with the | |
12 | * special capability to execute faulting instructions in software. The | |
13 | * handler does not try to handle the case when the program counter points | |
14 | * to an address not aligned to a word boundary. | |
15 | * | |
16 | * Putting data to unaligned addresses is a bad practice even on Intel where | |
17 | * only the performance is affected. Much worse is that such code is non- | |
18 | * portable. Due to several programs that die on MIPS due to alignment | |
19 | * problems I decided to implement this handler anyway though I originally | |
20 | * didn't intend to do this at all for user code. | |
21 | * | |
22 | * For now I enable fixing of address errors by default to make life easier. | |
23 | * I however intend to disable this somewhen in the future when the alignment | |
70342287 | 24 | * problems with user programs have been fixed. For programmers this is the |
1da177e4 LT |
25 | * right way to go. |
26 | * | |
27 | * Fixing address errors is a per process option. The option is inherited | |
70342287 | 28 | * across fork(2) and execve(2) calls. If you really want to use the |
1da177e4 LT |
29 | * option in your user programs - I discourage the use of the software |
30 | * emulation strongly - use the following code in your userland stuff: | |
31 | * | |
32 | * #include <sys/sysmips.h> | |
33 | * | |
34 | * ... | |
35 | * sysmips(MIPS_FIXADE, x); | |
36 | * ... | |
37 | * | |
38 | * The argument x is 0 for disabling software emulation, enabled otherwise. | |
39 | * | |
40 | * Below a little program to play around with this feature. | |
41 | * | |
42 | * #include <stdio.h> | |
43 | * #include <sys/sysmips.h> | |
44 | * | |
45 | * struct foo { | |
70342287 | 46 | * unsigned char bar[8]; |
1da177e4 LT |
47 | * }; |
48 | * | |
49 | * main(int argc, char *argv[]) | |
50 | * { | |
70342287 RB |
51 | * struct foo x = {0, 1, 2, 3, 4, 5, 6, 7}; |
52 | * unsigned int *p = (unsigned int *) (x.bar + 3); | |
53 | * int i; | |
1da177e4 | 54 | * |
70342287 RB |
55 | * if (argc > 1) |
56 | * sysmips(MIPS_FIXADE, atoi(argv[1])); | |
1da177e4 | 57 | * |
70342287 | 58 | * printf("*p = %08lx\n", *p); |
1da177e4 | 59 | * |
70342287 | 60 | * *p = 0xdeadface; |
1da177e4 | 61 | * |
70342287 RB |
62 | * for(i = 0; i <= 7; i++) |
63 | * printf("%02x ", x.bar[i]); | |
64 | * printf("\n"); | |
1da177e4 LT |
65 | * } |
66 | * | |
67 | * Coprocessor loads are not supported; I think this case is unimportant | |
68 | * in the practice. | |
69 | * | |
70 | * TODO: Handle ndc (attempted store to doubleword in uncached memory) | |
70342287 RB |
71 | * exception for the R6000. |
72 | * A store crossing a page boundary might be executed only partially. | |
73 | * Undo the partial store in this case. | |
1da177e4 | 74 | */ |
c3fc5cd5 | 75 | #include <linux/context_tracking.h> |
1da177e4 | 76 | #include <linux/mm.h> |
1da177e4 LT |
77 | #include <linux/signal.h> |
78 | #include <linux/smp.h> | |
e8edc6e0 | 79 | #include <linux/sched.h> |
6312e0ee | 80 | #include <linux/debugfs.h> |
7f788d2d DCZ |
81 | #include <linux/perf_event.h> |
82 | ||
1da177e4 LT |
83 | #include <asm/asm.h> |
84 | #include <asm/branch.h> | |
85 | #include <asm/byteorder.h> | |
69f3a7de | 86 | #include <asm/cop2.h> |
102cedc3 LY |
87 | #include <asm/fpu.h> |
88 | #include <asm/fpu_emulator.h> | |
1da177e4 LT |
89 | #include <asm/inst.h> |
90 | #include <asm/uaccess.h> | |
34c2f668 LY |
91 | #include <asm/fpu.h> |
92 | #include <asm/fpu_emulator.h> | |
1da177e4 | 93 | |
70342287 | 94 | #define STR(x) __STR(x) |
1da177e4 LT |
95 | #define __STR(x) #x |
96 | ||
6312e0ee AN |
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 | |
1da177e4 | 107 | #endif |
6312e0ee | 108 | extern void show_registers(struct pt_regs *regs); |
1da177e4 | 109 | |
34c2f668 LY |
110 | #ifdef __BIG_ENDIAN |
111 | #define LoadHW(addr, value, res) \ | |
112 | __asm__ __volatile__ (".set\tnoat\n" \ | |
113 | "1:\tlb\t%0, 0(%2)\n" \ | |
114 | "2:\tlbu\t$1, 1(%2)\n\t" \ | |
115 | "sll\t%0, 0x8\n\t" \ | |
116 | "or\t%0, $1\n\t" \ | |
117 | "li\t%1, 0\n" \ | |
118 | "3:\t.set\tat\n\t" \ | |
119 | ".insn\n\t" \ | |
120 | ".section\t.fixup,\"ax\"\n\t" \ | |
121 | "4:\tli\t%1, %3\n\t" \ | |
122 | "j\t3b\n\t" \ | |
123 | ".previous\n\t" \ | |
124 | ".section\t__ex_table,\"a\"\n\t" \ | |
125 | STR(PTR)"\t1b, 4b\n\t" \ | |
126 | STR(PTR)"\t2b, 4b\n\t" \ | |
127 | ".previous" \ | |
128 | : "=&r" (value), "=r" (res) \ | |
129 | : "r" (addr), "i" (-EFAULT)); | |
130 | ||
131 | #define LoadW(addr, value, res) \ | |
132 | __asm__ __volatile__ ( \ | |
133 | "1:\tlwl\t%0, (%2)\n" \ | |
134 | "2:\tlwr\t%0, 3(%2)\n\t" \ | |
135 | "li\t%1, 0\n" \ | |
136 | "3:\n\t" \ | |
137 | ".insn\n\t" \ | |
138 | ".section\t.fixup,\"ax\"\n\t" \ | |
139 | "4:\tli\t%1, %3\n\t" \ | |
140 | "j\t3b\n\t" \ | |
141 | ".previous\n\t" \ | |
142 | ".section\t__ex_table,\"a\"\n\t" \ | |
143 | STR(PTR)"\t1b, 4b\n\t" \ | |
144 | STR(PTR)"\t2b, 4b\n\t" \ | |
145 | ".previous" \ | |
146 | : "=&r" (value), "=r" (res) \ | |
147 | : "r" (addr), "i" (-EFAULT)); | |
148 | ||
149 | #define LoadHWU(addr, value, res) \ | |
150 | __asm__ __volatile__ ( \ | |
151 | ".set\tnoat\n" \ | |
152 | "1:\tlbu\t%0, 0(%2)\n" \ | |
153 | "2:\tlbu\t$1, 1(%2)\n\t" \ | |
154 | "sll\t%0, 0x8\n\t" \ | |
155 | "or\t%0, $1\n\t" \ | |
156 | "li\t%1, 0\n" \ | |
157 | "3:\n\t" \ | |
158 | ".insn\n\t" \ | |
159 | ".set\tat\n\t" \ | |
160 | ".section\t.fixup,\"ax\"\n\t" \ | |
161 | "4:\tli\t%1, %3\n\t" \ | |
162 | "j\t3b\n\t" \ | |
163 | ".previous\n\t" \ | |
164 | ".section\t__ex_table,\"a\"\n\t" \ | |
165 | STR(PTR)"\t1b, 4b\n\t" \ | |
166 | STR(PTR)"\t2b, 4b\n\t" \ | |
167 | ".previous" \ | |
168 | : "=&r" (value), "=r" (res) \ | |
169 | : "r" (addr), "i" (-EFAULT)); | |
170 | ||
171 | #define LoadWU(addr, value, res) \ | |
172 | __asm__ __volatile__ ( \ | |
173 | "1:\tlwl\t%0, (%2)\n" \ | |
174 | "2:\tlwr\t%0, 3(%2)\n\t" \ | |
175 | "dsll\t%0, %0, 32\n\t" \ | |
176 | "dsrl\t%0, %0, 32\n\t" \ | |
177 | "li\t%1, 0\n" \ | |
178 | "3:\n\t" \ | |
179 | ".insn\n\t" \ | |
180 | "\t.section\t.fixup,\"ax\"\n\t" \ | |
181 | "4:\tli\t%1, %3\n\t" \ | |
182 | "j\t3b\n\t" \ | |
183 | ".previous\n\t" \ | |
184 | ".section\t__ex_table,\"a\"\n\t" \ | |
185 | STR(PTR)"\t1b, 4b\n\t" \ | |
186 | STR(PTR)"\t2b, 4b\n\t" \ | |
187 | ".previous" \ | |
188 | : "=&r" (value), "=r" (res) \ | |
189 | : "r" (addr), "i" (-EFAULT)); | |
190 | ||
191 | #define LoadDW(addr, value, res) \ | |
192 | __asm__ __volatile__ ( \ | |
193 | "1:\tldl\t%0, (%2)\n" \ | |
194 | "2:\tldr\t%0, 7(%2)\n\t" \ | |
195 | "li\t%1, 0\n" \ | |
196 | "3:\n\t" \ | |
197 | ".insn\n\t" \ | |
198 | "\t.section\t.fixup,\"ax\"\n\t" \ | |
199 | "4:\tli\t%1, %3\n\t" \ | |
200 | "j\t3b\n\t" \ | |
201 | ".previous\n\t" \ | |
202 | ".section\t__ex_table,\"a\"\n\t" \ | |
203 | STR(PTR)"\t1b, 4b\n\t" \ | |
204 | STR(PTR)"\t2b, 4b\n\t" \ | |
205 | ".previous" \ | |
206 | : "=&r" (value), "=r" (res) \ | |
207 | : "r" (addr), "i" (-EFAULT)); | |
208 | ||
209 | #define StoreHW(addr, value, res) \ | |
210 | __asm__ __volatile__ ( \ | |
211 | ".set\tnoat\n" \ | |
212 | "1:\tsb\t%1, 1(%2)\n\t" \ | |
213 | "srl\t$1, %1, 0x8\n" \ | |
214 | "2:\tsb\t$1, 0(%2)\n\t" \ | |
215 | ".set\tat\n\t" \ | |
216 | "li\t%0, 0\n" \ | |
217 | "3:\n\t" \ | |
218 | ".insn\n\t" \ | |
219 | ".section\t.fixup,\"ax\"\n\t" \ | |
220 | "4:\tli\t%0, %3\n\t" \ | |
221 | "j\t3b\n\t" \ | |
222 | ".previous\n\t" \ | |
223 | ".section\t__ex_table,\"a\"\n\t" \ | |
224 | STR(PTR)"\t1b, 4b\n\t" \ | |
225 | STR(PTR)"\t2b, 4b\n\t" \ | |
226 | ".previous" \ | |
227 | : "=r" (res) \ | |
228 | : "r" (value), "r" (addr), "i" (-EFAULT)); | |
229 | ||
230 | #define StoreW(addr, value, res) \ | |
231 | __asm__ __volatile__ ( \ | |
232 | "1:\tswl\t%1,(%2)\n" \ | |
233 | "2:\tswr\t%1, 3(%2)\n\t" \ | |
234 | "li\t%0, 0\n" \ | |
235 | "3:\n\t" \ | |
236 | ".insn\n\t" \ | |
237 | ".section\t.fixup,\"ax\"\n\t" \ | |
238 | "4:\tli\t%0, %3\n\t" \ | |
239 | "j\t3b\n\t" \ | |
240 | ".previous\n\t" \ | |
241 | ".section\t__ex_table,\"a\"\n\t" \ | |
242 | STR(PTR)"\t1b, 4b\n\t" \ | |
243 | STR(PTR)"\t2b, 4b\n\t" \ | |
244 | ".previous" \ | |
245 | : "=r" (res) \ | |
246 | : "r" (value), "r" (addr), "i" (-EFAULT)); | |
247 | ||
248 | #define StoreDW(addr, value, res) \ | |
249 | __asm__ __volatile__ ( \ | |
250 | "1:\tsdl\t%1,(%2)\n" \ | |
251 | "2:\tsdr\t%1, 7(%2)\n\t" \ | |
252 | "li\t%0, 0\n" \ | |
253 | "3:\n\t" \ | |
254 | ".insn\n\t" \ | |
255 | ".section\t.fixup,\"ax\"\n\t" \ | |
256 | "4:\tli\t%0, %3\n\t" \ | |
257 | "j\t3b\n\t" \ | |
258 | ".previous\n\t" \ | |
259 | ".section\t__ex_table,\"a\"\n\t" \ | |
260 | STR(PTR)"\t1b, 4b\n\t" \ | |
261 | STR(PTR)"\t2b, 4b\n\t" \ | |
262 | ".previous" \ | |
263 | : "=r" (res) \ | |
264 | : "r" (value), "r" (addr), "i" (-EFAULT)); | |
265 | #endif | |
266 | ||
267 | #ifdef __LITTLE_ENDIAN | |
268 | #define LoadHW(addr, value, res) \ | |
269 | __asm__ __volatile__ (".set\tnoat\n" \ | |
270 | "1:\tlb\t%0, 1(%2)\n" \ | |
271 | "2:\tlbu\t$1, 0(%2)\n\t" \ | |
272 | "sll\t%0, 0x8\n\t" \ | |
273 | "or\t%0, $1\n\t" \ | |
274 | "li\t%1, 0\n" \ | |
275 | "3:\t.set\tat\n\t" \ | |
276 | ".insn\n\t" \ | |
277 | ".section\t.fixup,\"ax\"\n\t" \ | |
278 | "4:\tli\t%1, %3\n\t" \ | |
279 | "j\t3b\n\t" \ | |
280 | ".previous\n\t" \ | |
281 | ".section\t__ex_table,\"a\"\n\t" \ | |
282 | STR(PTR)"\t1b, 4b\n\t" \ | |
283 | STR(PTR)"\t2b, 4b\n\t" \ | |
284 | ".previous" \ | |
285 | : "=&r" (value), "=r" (res) \ | |
286 | : "r" (addr), "i" (-EFAULT)); | |
287 | ||
288 | #define LoadW(addr, value, res) \ | |
289 | __asm__ __volatile__ ( \ | |
290 | "1:\tlwl\t%0, 3(%2)\n" \ | |
291 | "2:\tlwr\t%0, (%2)\n\t" \ | |
292 | "li\t%1, 0\n" \ | |
293 | "3:\n\t" \ | |
294 | ".insn\n\t" \ | |
295 | ".section\t.fixup,\"ax\"\n\t" \ | |
296 | "4:\tli\t%1, %3\n\t" \ | |
297 | "j\t3b\n\t" \ | |
298 | ".previous\n\t" \ | |
299 | ".section\t__ex_table,\"a\"\n\t" \ | |
300 | STR(PTR)"\t1b, 4b\n\t" \ | |
301 | STR(PTR)"\t2b, 4b\n\t" \ | |
302 | ".previous" \ | |
303 | : "=&r" (value), "=r" (res) \ | |
304 | : "r" (addr), "i" (-EFAULT)); | |
305 | ||
306 | #define LoadHWU(addr, value, res) \ | |
307 | __asm__ __volatile__ ( \ | |
308 | ".set\tnoat\n" \ | |
309 | "1:\tlbu\t%0, 1(%2)\n" \ | |
310 | "2:\tlbu\t$1, 0(%2)\n\t" \ | |
311 | "sll\t%0, 0x8\n\t" \ | |
312 | "or\t%0, $1\n\t" \ | |
313 | "li\t%1, 0\n" \ | |
314 | "3:\n\t" \ | |
315 | ".insn\n\t" \ | |
316 | ".set\tat\n\t" \ | |
317 | ".section\t.fixup,\"ax\"\n\t" \ | |
318 | "4:\tli\t%1, %3\n\t" \ | |
319 | "j\t3b\n\t" \ | |
320 | ".previous\n\t" \ | |
321 | ".section\t__ex_table,\"a\"\n\t" \ | |
322 | STR(PTR)"\t1b, 4b\n\t" \ | |
323 | STR(PTR)"\t2b, 4b\n\t" \ | |
324 | ".previous" \ | |
325 | : "=&r" (value), "=r" (res) \ | |
326 | : "r" (addr), "i" (-EFAULT)); | |
327 | ||
328 | #define LoadWU(addr, value, res) \ | |
329 | __asm__ __volatile__ ( \ | |
330 | "1:\tlwl\t%0, 3(%2)\n" \ | |
331 | "2:\tlwr\t%0, (%2)\n\t" \ | |
332 | "dsll\t%0, %0, 32\n\t" \ | |
333 | "dsrl\t%0, %0, 32\n\t" \ | |
334 | "li\t%1, 0\n" \ | |
335 | "3:\n\t" \ | |
336 | ".insn\n\t" \ | |
337 | "\t.section\t.fixup,\"ax\"\n\t" \ | |
338 | "4:\tli\t%1, %3\n\t" \ | |
339 | "j\t3b\n\t" \ | |
340 | ".previous\n\t" \ | |
341 | ".section\t__ex_table,\"a\"\n\t" \ | |
342 | STR(PTR)"\t1b, 4b\n\t" \ | |
343 | STR(PTR)"\t2b, 4b\n\t" \ | |
344 | ".previous" \ | |
345 | : "=&r" (value), "=r" (res) \ | |
346 | : "r" (addr), "i" (-EFAULT)); | |
347 | ||
348 | #define LoadDW(addr, value, res) \ | |
349 | __asm__ __volatile__ ( \ | |
350 | "1:\tldl\t%0, 7(%2)\n" \ | |
351 | "2:\tldr\t%0, (%2)\n\t" \ | |
352 | "li\t%1, 0\n" \ | |
353 | "3:\n\t" \ | |
354 | ".insn\n\t" \ | |
355 | "\t.section\t.fixup,\"ax\"\n\t" \ | |
356 | "4:\tli\t%1, %3\n\t" \ | |
357 | "j\t3b\n\t" \ | |
358 | ".previous\n\t" \ | |
359 | ".section\t__ex_table,\"a\"\n\t" \ | |
360 | STR(PTR)"\t1b, 4b\n\t" \ | |
361 | STR(PTR)"\t2b, 4b\n\t" \ | |
362 | ".previous" \ | |
363 | : "=&r" (value), "=r" (res) \ | |
364 | : "r" (addr), "i" (-EFAULT)); | |
365 | ||
366 | #define StoreHW(addr, value, res) \ | |
367 | __asm__ __volatile__ ( \ | |
368 | ".set\tnoat\n" \ | |
369 | "1:\tsb\t%1, 0(%2)\n\t" \ | |
370 | "srl\t$1,%1, 0x8\n" \ | |
371 | "2:\tsb\t$1, 1(%2)\n\t" \ | |
372 | ".set\tat\n\t" \ | |
373 | "li\t%0, 0\n" \ | |
374 | "3:\n\t" \ | |
375 | ".insn\n\t" \ | |
376 | ".section\t.fixup,\"ax\"\n\t" \ | |
377 | "4:\tli\t%0, %3\n\t" \ | |
378 | "j\t3b\n\t" \ | |
379 | ".previous\n\t" \ | |
380 | ".section\t__ex_table,\"a\"\n\t" \ | |
381 | STR(PTR)"\t1b, 4b\n\t" \ | |
382 | STR(PTR)"\t2b, 4b\n\t" \ | |
383 | ".previous" \ | |
384 | : "=r" (res) \ | |
385 | : "r" (value), "r" (addr), "i" (-EFAULT)); | |
386 | ||
387 | #define StoreW(addr, value, res) \ | |
388 | __asm__ __volatile__ ( \ | |
389 | "1:\tswl\t%1, 3(%2)\n" \ | |
390 | "2:\tswr\t%1, (%2)\n\t" \ | |
391 | "li\t%0, 0\n" \ | |
392 | "3:\n\t" \ | |
393 | ".insn\n\t" \ | |
394 | ".section\t.fixup,\"ax\"\n\t" \ | |
395 | "4:\tli\t%0, %3\n\t" \ | |
396 | "j\t3b\n\t" \ | |
397 | ".previous\n\t" \ | |
398 | ".section\t__ex_table,\"a\"\n\t" \ | |
399 | STR(PTR)"\t1b, 4b\n\t" \ | |
400 | STR(PTR)"\t2b, 4b\n\t" \ | |
401 | ".previous" \ | |
402 | : "=r" (res) \ | |
403 | : "r" (value), "r" (addr), "i" (-EFAULT)); | |
404 | ||
405 | #define StoreDW(addr, value, res) \ | |
406 | __asm__ __volatile__ ( \ | |
407 | "1:\tsdl\t%1, 7(%2)\n" \ | |
408 | "2:\tsdr\t%1, (%2)\n\t" \ | |
409 | "li\t%0, 0\n" \ | |
410 | "3:\n\t" \ | |
411 | ".insn\n\t" \ | |
412 | ".section\t.fixup,\"ax\"\n\t" \ | |
413 | "4:\tli\t%0, %3\n\t" \ | |
414 | "j\t3b\n\t" \ | |
415 | ".previous\n\t" \ | |
416 | ".section\t__ex_table,\"a\"\n\t" \ | |
417 | STR(PTR)"\t1b, 4b\n\t" \ | |
418 | STR(PTR)"\t2b, 4b\n\t" \ | |
419 | ".previous" \ | |
420 | : "=r" (res) \ | |
421 | : "r" (value), "r" (addr), "i" (-EFAULT)); | |
422 | #endif | |
423 | ||
7f18f151 RB |
424 | static void emulate_load_store_insn(struct pt_regs *regs, |
425 | void __user *addr, unsigned int __user *pc) | |
1da177e4 LT |
426 | { |
427 | union mips_instruction insn; | |
428 | unsigned long value; | |
429 | unsigned int res; | |
34c2f668 LY |
430 | unsigned long origpc; |
431 | unsigned long orig31; | |
102cedc3 | 432 | void __user *fault_addr = NULL; |
1da177e4 | 433 | |
34c2f668 LY |
434 | origpc = (unsigned long)pc; |
435 | orig31 = regs->regs[31]; | |
436 | ||
a8b0ca17 | 437 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); |
7f788d2d | 438 | |
1da177e4 LT |
439 | /* |
440 | * This load never faults. | |
441 | */ | |
fe00f943 | 442 | __get_user(insn.word, pc); |
1da177e4 LT |
443 | |
444 | switch (insn.i_format.opcode) { | |
34c2f668 LY |
445 | /* |
446 | * These are instructions that a compiler doesn't generate. We | |
447 | * can assume therefore that the code is MIPS-aware and | |
448 | * really buggy. Emulating these instructions would break the | |
449 | * semantics anyway. | |
450 | */ | |
1da177e4 LT |
451 | case ll_op: |
452 | case lld_op: | |
453 | case sc_op: | |
454 | case scd_op: | |
455 | ||
34c2f668 LY |
456 | /* |
457 | * For these instructions the only way to create an address | |
458 | * error is an attempted access to kernel/supervisor address | |
459 | * space. | |
460 | */ | |
1da177e4 LT |
461 | case ldl_op: |
462 | case ldr_op: | |
463 | case lwl_op: | |
464 | case lwr_op: | |
465 | case sdl_op: | |
466 | case sdr_op: | |
467 | case swl_op: | |
468 | case swr_op: | |
469 | case lb_op: | |
470 | case lbu_op: | |
471 | case sb_op: | |
472 | goto sigbus; | |
473 | ||
34c2f668 LY |
474 | /* |
475 | * The remaining opcodes are the ones that are really of | |
476 | * interest. | |
477 | */ | |
1da177e4 LT |
478 | case lh_op: |
479 | if (!access_ok(VERIFY_READ, addr, 2)) | |
480 | goto sigbus; | |
481 | ||
34c2f668 | 482 | LoadHW(addr, value, res); |
1da177e4 LT |
483 | if (res) |
484 | goto fault; | |
7f18f151 RB |
485 | compute_return_epc(regs); |
486 | regs->regs[insn.i_format.rt] = value; | |
1da177e4 LT |
487 | break; |
488 | ||
489 | case lw_op: | |
490 | if (!access_ok(VERIFY_READ, addr, 4)) | |
491 | goto sigbus; | |
492 | ||
34c2f668 | 493 | LoadW(addr, value, res); |
1da177e4 LT |
494 | if (res) |
495 | goto fault; | |
7f18f151 RB |
496 | compute_return_epc(regs); |
497 | regs->regs[insn.i_format.rt] = value; | |
1da177e4 LT |
498 | break; |
499 | ||
500 | case lhu_op: | |
501 | if (!access_ok(VERIFY_READ, addr, 2)) | |
502 | goto sigbus; | |
503 | ||
34c2f668 | 504 | LoadHWU(addr, value, res); |
1da177e4 LT |
505 | if (res) |
506 | goto fault; | |
7f18f151 RB |
507 | compute_return_epc(regs); |
508 | regs->regs[insn.i_format.rt] = value; | |
1da177e4 LT |
509 | break; |
510 | ||
511 | case lwu_op: | |
875d43e7 | 512 | #ifdef CONFIG_64BIT |
1da177e4 LT |
513 | /* |
514 | * A 32-bit kernel might be running on a 64-bit processor. But | |
515 | * if we're on a 32-bit processor and an i-cache incoherency | |
516 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
517 | * would blow up, so for now we don't handle unaligned 64-bit | |
518 | * instructions on 32-bit kernels. | |
519 | */ | |
520 | if (!access_ok(VERIFY_READ, addr, 4)) | |
521 | goto sigbus; | |
522 | ||
34c2f668 | 523 | LoadWU(addr, value, res); |
1da177e4 LT |
524 | if (res) |
525 | goto fault; | |
7f18f151 RB |
526 | compute_return_epc(regs); |
527 | regs->regs[insn.i_format.rt] = value; | |
1da177e4 | 528 | break; |
875d43e7 | 529 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
530 | |
531 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
532 | goto sigill; | |
533 | ||
534 | case ld_op: | |
875d43e7 | 535 | #ifdef CONFIG_64BIT |
1da177e4 LT |
536 | /* |
537 | * A 32-bit kernel might be running on a 64-bit processor. But | |
538 | * if we're on a 32-bit processor and an i-cache incoherency | |
539 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
540 | * would blow up, so for now we don't handle unaligned 64-bit | |
541 | * instructions on 32-bit kernels. | |
542 | */ | |
543 | if (!access_ok(VERIFY_READ, addr, 8)) | |
544 | goto sigbus; | |
545 | ||
34c2f668 | 546 | LoadDW(addr, value, res); |
1da177e4 LT |
547 | if (res) |
548 | goto fault; | |
7f18f151 RB |
549 | compute_return_epc(regs); |
550 | regs->regs[insn.i_format.rt] = value; | |
1da177e4 | 551 | break; |
875d43e7 | 552 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
553 | |
554 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
555 | goto sigill; | |
556 | ||
557 | case sh_op: | |
558 | if (!access_ok(VERIFY_WRITE, addr, 2)) | |
559 | goto sigbus; | |
560 | ||
34c2f668 | 561 | compute_return_epc(regs); |
1da177e4 | 562 | value = regs->regs[insn.i_format.rt]; |
34c2f668 | 563 | StoreHW(addr, value, res); |
1da177e4 LT |
564 | if (res) |
565 | goto fault; | |
566 | break; | |
567 | ||
568 | case sw_op: | |
569 | if (!access_ok(VERIFY_WRITE, addr, 4)) | |
570 | goto sigbus; | |
571 | ||
34c2f668 | 572 | compute_return_epc(regs); |
1da177e4 | 573 | value = regs->regs[insn.i_format.rt]; |
34c2f668 | 574 | StoreW(addr, value, res); |
1da177e4 LT |
575 | if (res) |
576 | goto fault; | |
577 | break; | |
578 | ||
579 | case sd_op: | |
875d43e7 | 580 | #ifdef CONFIG_64BIT |
1da177e4 LT |
581 | /* |
582 | * A 32-bit kernel might be running on a 64-bit processor. But | |
583 | * if we're on a 32-bit processor and an i-cache incoherency | |
584 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
585 | * would blow up, so for now we don't handle unaligned 64-bit | |
586 | * instructions on 32-bit kernels. | |
587 | */ | |
588 | if (!access_ok(VERIFY_WRITE, addr, 8)) | |
589 | goto sigbus; | |
590 | ||
34c2f668 | 591 | compute_return_epc(regs); |
1da177e4 | 592 | value = regs->regs[insn.i_format.rt]; |
34c2f668 | 593 | StoreDW(addr, value, res); |
1da177e4 LT |
594 | if (res) |
595 | goto fault; | |
596 | break; | |
875d43e7 | 597 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
598 | |
599 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
600 | goto sigill; | |
601 | ||
602 | case lwc1_op: | |
603 | case ldc1_op: | |
604 | case swc1_op: | |
605 | case sdc1_op: | |
102cedc3 LY |
606 | die_if_kernel("Unaligned FP access in kernel code", regs); |
607 | BUG_ON(!used_math()); | |
608 | BUG_ON(!is_fpu_owner()); | |
609 | ||
610 | lose_fpu(1); /* Save FPU state for the emulator. */ | |
611 | res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1, | |
612 | &fault_addr); | |
613 | own_fpu(1); /* Restore FPU state. */ | |
614 | ||
615 | /* Signal if something went wrong. */ | |
616 | process_fpemu_return(res, fault_addr); | |
617 | ||
618 | if (res == 0) | |
619 | break; | |
620 | return; | |
1da177e4 | 621 | |
69f3a7de RB |
622 | /* |
623 | * COP2 is available to implementor for application specific use. | |
624 | * It's up to applications to register a notifier chain and do | |
625 | * whatever they have to do, including possible sending of signals. | |
626 | */ | |
1da177e4 | 627 | case lwc2_op: |
69f3a7de RB |
628 | cu2_notifier_call_chain(CU2_LWC2_OP, regs); |
629 | break; | |
630 | ||
1da177e4 | 631 | case ldc2_op: |
69f3a7de RB |
632 | cu2_notifier_call_chain(CU2_LDC2_OP, regs); |
633 | break; | |
634 | ||
1da177e4 | 635 | case swc2_op: |
69f3a7de RB |
636 | cu2_notifier_call_chain(CU2_SWC2_OP, regs); |
637 | break; | |
638 | ||
1da177e4 | 639 | case sdc2_op: |
69f3a7de RB |
640 | cu2_notifier_call_chain(CU2_SDC2_OP, regs); |
641 | break; | |
642 | ||
1da177e4 LT |
643 | default: |
644 | /* | |
645 | * Pheeee... We encountered an yet unknown instruction or | |
646 | * cache coherence problem. Die sucker, die ... | |
647 | */ | |
648 | goto sigill; | |
649 | } | |
650 | ||
6312e0ee | 651 | #ifdef CONFIG_DEBUG_FS |
1da177e4 LT |
652 | unaligned_instructions++; |
653 | #endif | |
654 | ||
7f18f151 | 655 | return; |
1da177e4 LT |
656 | |
657 | fault: | |
34c2f668 LY |
658 | /* roll back jump/branch */ |
659 | regs->cp0_epc = origpc; | |
660 | regs->regs[31] = orig31; | |
661 | /* Did we have an exception handler installed? */ | |
662 | if (fixup_exception(regs)) | |
663 | return; | |
664 | ||
665 | die_if_kernel("Unhandled kernel unaligned access", regs); | |
666 | force_sig(SIGSEGV, current); | |
667 | ||
668 | return; | |
669 | ||
670 | sigbus: | |
671 | die_if_kernel("Unhandled kernel unaligned access", regs); | |
672 | force_sig(SIGBUS, current); | |
673 | ||
674 | return; | |
675 | ||
676 | sigill: | |
677 | die_if_kernel | |
678 | ("Unhandled kernel unaligned access or invalid instruction", regs); | |
679 | force_sig(SIGILL, current); | |
680 | } | |
681 | ||
682 | /* Recode table from 16-bit register notation to 32-bit GPR. */ | |
683 | const int reg16to32[] = { 16, 17, 2, 3, 4, 5, 6, 7 }; | |
684 | ||
685 | /* Recode table from 16-bit STORE register notation to 32-bit GPR. */ | |
686 | const int reg16to32st[] = { 0, 17, 2, 3, 4, 5, 6, 7 }; | |
687 | ||
688 | void emulate_load_store_microMIPS(struct pt_regs *regs, void __user * addr) | |
689 | { | |
690 | unsigned long value; | |
691 | unsigned int res; | |
692 | int i; | |
693 | unsigned int reg = 0, rvar; | |
694 | unsigned long orig31; | |
695 | u16 __user *pc16; | |
696 | u16 halfword; | |
697 | unsigned int word; | |
698 | unsigned long origpc, contpc; | |
699 | union mips_instruction insn; | |
700 | struct mm_decoded_insn mminsn; | |
701 | void __user *fault_addr = NULL; | |
702 | ||
703 | origpc = regs->cp0_epc; | |
704 | orig31 = regs->regs[31]; | |
705 | ||
706 | mminsn.micro_mips_mode = 1; | |
707 | ||
708 | /* | |
709 | * This load never faults. | |
710 | */ | |
711 | pc16 = (unsigned short __user *)msk_isa16_mode(regs->cp0_epc); | |
712 | __get_user(halfword, pc16); | |
713 | pc16++; | |
714 | contpc = regs->cp0_epc + 2; | |
715 | word = ((unsigned int)halfword << 16); | |
716 | mminsn.pc_inc = 2; | |
717 | ||
718 | if (!mm_insn_16bit(halfword)) { | |
719 | __get_user(halfword, pc16); | |
720 | pc16++; | |
721 | contpc = regs->cp0_epc + 4; | |
722 | mminsn.pc_inc = 4; | |
723 | word |= halfword; | |
724 | } | |
725 | mminsn.insn = word; | |
726 | ||
727 | if (get_user(halfword, pc16)) | |
728 | goto fault; | |
729 | mminsn.next_pc_inc = 2; | |
730 | word = ((unsigned int)halfword << 16); | |
731 | ||
732 | if (!mm_insn_16bit(halfword)) { | |
733 | pc16++; | |
734 | if (get_user(halfword, pc16)) | |
735 | goto fault; | |
736 | mminsn.next_pc_inc = 4; | |
737 | word |= halfword; | |
738 | } | |
739 | mminsn.next_insn = word; | |
740 | ||
741 | insn = (union mips_instruction)(mminsn.insn); | |
742 | if (mm_isBranchInstr(regs, mminsn, &contpc)) | |
743 | insn = (union mips_instruction)(mminsn.next_insn); | |
744 | ||
745 | /* Parse instruction to find what to do */ | |
746 | ||
747 | switch (insn.mm_i_format.opcode) { | |
748 | ||
749 | case mm_pool32a_op: | |
750 | switch (insn.mm_x_format.func) { | |
751 | case mm_lwxs_op: | |
752 | reg = insn.mm_x_format.rd; | |
753 | goto loadW; | |
754 | } | |
755 | ||
756 | goto sigbus; | |
757 | ||
758 | case mm_pool32b_op: | |
759 | switch (insn.mm_m_format.func) { | |
760 | case mm_lwp_func: | |
761 | reg = insn.mm_m_format.rd; | |
762 | if (reg == 31) | |
763 | goto sigbus; | |
764 | ||
765 | if (!access_ok(VERIFY_READ, addr, 8)) | |
766 | goto sigbus; | |
767 | ||
768 | LoadW(addr, value, res); | |
769 | if (res) | |
770 | goto fault; | |
771 | regs->regs[reg] = value; | |
772 | addr += 4; | |
773 | LoadW(addr, value, res); | |
774 | if (res) | |
775 | goto fault; | |
776 | regs->regs[reg + 1] = value; | |
777 | goto success; | |
778 | ||
779 | case mm_swp_func: | |
780 | reg = insn.mm_m_format.rd; | |
781 | if (reg == 31) | |
782 | goto sigbus; | |
783 | ||
784 | if (!access_ok(VERIFY_WRITE, addr, 8)) | |
785 | goto sigbus; | |
786 | ||
787 | value = regs->regs[reg]; | |
788 | StoreW(addr, value, res); | |
789 | if (res) | |
790 | goto fault; | |
791 | addr += 4; | |
792 | value = regs->regs[reg + 1]; | |
793 | StoreW(addr, value, res); | |
794 | if (res) | |
795 | goto fault; | |
796 | goto success; | |
797 | ||
798 | case mm_ldp_func: | |
799 | #ifdef CONFIG_64BIT | |
800 | reg = insn.mm_m_format.rd; | |
801 | if (reg == 31) | |
802 | goto sigbus; | |
803 | ||
804 | if (!access_ok(VERIFY_READ, addr, 16)) | |
805 | goto sigbus; | |
806 | ||
807 | LoadDW(addr, value, res); | |
808 | if (res) | |
809 | goto fault; | |
810 | regs->regs[reg] = value; | |
811 | addr += 8; | |
812 | LoadDW(addr, value, res); | |
813 | if (res) | |
814 | goto fault; | |
815 | regs->regs[reg + 1] = value; | |
816 | goto success; | |
817 | #endif /* CONFIG_64BIT */ | |
818 | ||
819 | goto sigill; | |
820 | ||
821 | case mm_sdp_func: | |
822 | #ifdef CONFIG_64BIT | |
823 | reg = insn.mm_m_format.rd; | |
824 | if (reg == 31) | |
825 | goto sigbus; | |
826 | ||
827 | if (!access_ok(VERIFY_WRITE, addr, 16)) | |
828 | goto sigbus; | |
829 | ||
830 | value = regs->regs[reg]; | |
831 | StoreDW(addr, value, res); | |
832 | if (res) | |
833 | goto fault; | |
834 | addr += 8; | |
835 | value = regs->regs[reg + 1]; | |
836 | StoreDW(addr, value, res); | |
837 | if (res) | |
838 | goto fault; | |
839 | goto success; | |
840 | #endif /* CONFIG_64BIT */ | |
841 | ||
842 | goto sigill; | |
843 | ||
844 | case mm_lwm32_func: | |
845 | reg = insn.mm_m_format.rd; | |
846 | rvar = reg & 0xf; | |
847 | if ((rvar > 9) || !reg) | |
848 | goto sigill; | |
849 | if (reg & 0x10) { | |
850 | if (!access_ok | |
851 | (VERIFY_READ, addr, 4 * (rvar + 1))) | |
852 | goto sigbus; | |
853 | } else { | |
854 | if (!access_ok(VERIFY_READ, addr, 4 * rvar)) | |
855 | goto sigbus; | |
856 | } | |
857 | if (rvar == 9) | |
858 | rvar = 8; | |
859 | for (i = 16; rvar; rvar--, i++) { | |
860 | LoadW(addr, value, res); | |
861 | if (res) | |
862 | goto fault; | |
863 | addr += 4; | |
864 | regs->regs[i] = value; | |
865 | } | |
866 | if ((reg & 0xf) == 9) { | |
867 | LoadW(addr, value, res); | |
868 | if (res) | |
869 | goto fault; | |
870 | addr += 4; | |
871 | regs->regs[30] = value; | |
872 | } | |
873 | if (reg & 0x10) { | |
874 | LoadW(addr, value, res); | |
875 | if (res) | |
876 | goto fault; | |
877 | regs->regs[31] = value; | |
878 | } | |
879 | goto success; | |
880 | ||
881 | case mm_swm32_func: | |
882 | reg = insn.mm_m_format.rd; | |
883 | rvar = reg & 0xf; | |
884 | if ((rvar > 9) || !reg) | |
885 | goto sigill; | |
886 | if (reg & 0x10) { | |
887 | if (!access_ok | |
888 | (VERIFY_WRITE, addr, 4 * (rvar + 1))) | |
889 | goto sigbus; | |
890 | } else { | |
891 | if (!access_ok(VERIFY_WRITE, addr, 4 * rvar)) | |
892 | goto sigbus; | |
893 | } | |
894 | if (rvar == 9) | |
895 | rvar = 8; | |
896 | for (i = 16; rvar; rvar--, i++) { | |
897 | value = regs->regs[i]; | |
898 | StoreW(addr, value, res); | |
899 | if (res) | |
900 | goto fault; | |
901 | addr += 4; | |
902 | } | |
903 | if ((reg & 0xf) == 9) { | |
904 | value = regs->regs[30]; | |
905 | StoreW(addr, value, res); | |
906 | if (res) | |
907 | goto fault; | |
908 | addr += 4; | |
909 | } | |
910 | if (reg & 0x10) { | |
911 | value = regs->regs[31]; | |
912 | StoreW(addr, value, res); | |
913 | if (res) | |
914 | goto fault; | |
915 | } | |
916 | goto success; | |
917 | ||
918 | case mm_ldm_func: | |
919 | #ifdef CONFIG_64BIT | |
920 | reg = insn.mm_m_format.rd; | |
921 | rvar = reg & 0xf; | |
922 | if ((rvar > 9) || !reg) | |
923 | goto sigill; | |
924 | if (reg & 0x10) { | |
925 | if (!access_ok | |
926 | (VERIFY_READ, addr, 8 * (rvar + 1))) | |
927 | goto sigbus; | |
928 | } else { | |
929 | if (!access_ok(VERIFY_READ, addr, 8 * rvar)) | |
930 | goto sigbus; | |
931 | } | |
932 | if (rvar == 9) | |
933 | rvar = 8; | |
934 | ||
935 | for (i = 16; rvar; rvar--, i++) { | |
936 | LoadDW(addr, value, res); | |
937 | if (res) | |
938 | goto fault; | |
939 | addr += 4; | |
940 | regs->regs[i] = value; | |
941 | } | |
942 | if ((reg & 0xf) == 9) { | |
943 | LoadDW(addr, value, res); | |
944 | if (res) | |
945 | goto fault; | |
946 | addr += 8; | |
947 | regs->regs[30] = value; | |
948 | } | |
949 | if (reg & 0x10) { | |
950 | LoadDW(addr, value, res); | |
951 | if (res) | |
952 | goto fault; | |
953 | regs->regs[31] = value; | |
954 | } | |
955 | goto success; | |
956 | #endif /* CONFIG_64BIT */ | |
957 | ||
958 | goto sigill; | |
959 | ||
960 | case mm_sdm_func: | |
961 | #ifdef CONFIG_64BIT | |
962 | reg = insn.mm_m_format.rd; | |
963 | rvar = reg & 0xf; | |
964 | if ((rvar > 9) || !reg) | |
965 | goto sigill; | |
966 | if (reg & 0x10) { | |
967 | if (!access_ok | |
968 | (VERIFY_WRITE, addr, 8 * (rvar + 1))) | |
969 | goto sigbus; | |
970 | } else { | |
971 | if (!access_ok(VERIFY_WRITE, addr, 8 * rvar)) | |
972 | goto sigbus; | |
973 | } | |
974 | if (rvar == 9) | |
975 | rvar = 8; | |
976 | ||
977 | for (i = 16; rvar; rvar--, i++) { | |
978 | value = regs->regs[i]; | |
979 | StoreDW(addr, value, res); | |
980 | if (res) | |
981 | goto fault; | |
982 | addr += 8; | |
983 | } | |
984 | if ((reg & 0xf) == 9) { | |
985 | value = regs->regs[30]; | |
986 | StoreDW(addr, value, res); | |
987 | if (res) | |
988 | goto fault; | |
989 | addr += 8; | |
990 | } | |
991 | if (reg & 0x10) { | |
992 | value = regs->regs[31]; | |
993 | StoreDW(addr, value, res); | |
994 | if (res) | |
995 | goto fault; | |
996 | } | |
997 | goto success; | |
998 | #endif /* CONFIG_64BIT */ | |
999 | ||
1000 | goto sigill; | |
1001 | ||
1002 | /* LWC2, SWC2, LDC2, SDC2 are not serviced */ | |
1003 | } | |
1004 | ||
1005 | goto sigbus; | |
1006 | ||
1007 | case mm_pool32c_op: | |
1008 | switch (insn.mm_m_format.func) { | |
1009 | case mm_lwu_func: | |
1010 | reg = insn.mm_m_format.rd; | |
1011 | goto loadWU; | |
1012 | } | |
1013 | ||
1014 | /* LL,SC,LLD,SCD are not serviced */ | |
1015 | goto sigbus; | |
1016 | ||
1017 | case mm_pool32f_op: | |
1018 | switch (insn.mm_x_format.func) { | |
1019 | case mm_lwxc1_func: | |
1020 | case mm_swxc1_func: | |
1021 | case mm_ldxc1_func: | |
1022 | case mm_sdxc1_func: | |
1023 | goto fpu_emul; | |
1024 | } | |
1025 | ||
1026 | goto sigbus; | |
1027 | ||
1028 | case mm_ldc132_op: | |
1029 | case mm_sdc132_op: | |
1030 | case mm_lwc132_op: | |
1031 | case mm_swc132_op: | |
1032 | fpu_emul: | |
1033 | /* roll back jump/branch */ | |
1034 | regs->cp0_epc = origpc; | |
1035 | regs->regs[31] = orig31; | |
1036 | ||
1037 | die_if_kernel("Unaligned FP access in kernel code", regs); | |
1038 | BUG_ON(!used_math()); | |
1039 | BUG_ON(!is_fpu_owner()); | |
1040 | ||
1041 | lose_fpu(1); /* save the FPU state for the emulator */ | |
1042 | res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1, | |
1043 | &fault_addr); | |
1044 | own_fpu(1); /* restore FPU state */ | |
1045 | ||
1046 | /* If something went wrong, signal */ | |
1047 | process_fpemu_return(res, fault_addr); | |
1048 | ||
1049 | if (res == 0) | |
1050 | goto success; | |
1051 | return; | |
1052 | ||
1053 | case mm_lh32_op: | |
1054 | reg = insn.mm_i_format.rt; | |
1055 | goto loadHW; | |
1056 | ||
1057 | case mm_lhu32_op: | |
1058 | reg = insn.mm_i_format.rt; | |
1059 | goto loadHWU; | |
1060 | ||
1061 | case mm_lw32_op: | |
1062 | reg = insn.mm_i_format.rt; | |
1063 | goto loadW; | |
1064 | ||
1065 | case mm_sh32_op: | |
1066 | reg = insn.mm_i_format.rt; | |
1067 | goto storeHW; | |
1068 | ||
1069 | case mm_sw32_op: | |
1070 | reg = insn.mm_i_format.rt; | |
1071 | goto storeW; | |
1072 | ||
1073 | case mm_ld32_op: | |
1074 | reg = insn.mm_i_format.rt; | |
1075 | goto loadDW; | |
1076 | ||
1077 | case mm_sd32_op: | |
1078 | reg = insn.mm_i_format.rt; | |
1079 | goto storeDW; | |
1080 | ||
1081 | case mm_pool16c_op: | |
1082 | switch (insn.mm16_m_format.func) { | |
1083 | case mm_lwm16_op: | |
1084 | reg = insn.mm16_m_format.rlist; | |
1085 | rvar = reg + 1; | |
1086 | if (!access_ok(VERIFY_READ, addr, 4 * rvar)) | |
1087 | goto sigbus; | |
1088 | ||
1089 | for (i = 16; rvar; rvar--, i++) { | |
1090 | LoadW(addr, value, res); | |
1091 | if (res) | |
1092 | goto fault; | |
1093 | addr += 4; | |
1094 | regs->regs[i] = value; | |
1095 | } | |
1096 | LoadW(addr, value, res); | |
1097 | if (res) | |
1098 | goto fault; | |
1099 | regs->regs[31] = value; | |
1100 | ||
1101 | goto success; | |
1102 | ||
1103 | case mm_swm16_op: | |
1104 | reg = insn.mm16_m_format.rlist; | |
1105 | rvar = reg + 1; | |
1106 | if (!access_ok(VERIFY_WRITE, addr, 4 * rvar)) | |
1107 | goto sigbus; | |
1108 | ||
1109 | for (i = 16; rvar; rvar--, i++) { | |
1110 | value = regs->regs[i]; | |
1111 | StoreW(addr, value, res); | |
1112 | if (res) | |
1113 | goto fault; | |
1114 | addr += 4; | |
1115 | } | |
1116 | value = regs->regs[31]; | |
1117 | StoreW(addr, value, res); | |
1118 | if (res) | |
1119 | goto fault; | |
1120 | ||
1121 | goto success; | |
1122 | ||
1123 | } | |
1124 | ||
1125 | goto sigbus; | |
1126 | ||
1127 | case mm_lhu16_op: | |
1128 | reg = reg16to32[insn.mm16_rb_format.rt]; | |
1129 | goto loadHWU; | |
1130 | ||
1131 | case mm_lw16_op: | |
1132 | reg = reg16to32[insn.mm16_rb_format.rt]; | |
1133 | goto loadW; | |
1134 | ||
1135 | case mm_sh16_op: | |
1136 | reg = reg16to32st[insn.mm16_rb_format.rt]; | |
1137 | goto storeHW; | |
1138 | ||
1139 | case mm_sw16_op: | |
1140 | reg = reg16to32st[insn.mm16_rb_format.rt]; | |
1141 | goto storeW; | |
1142 | ||
1143 | case mm_lwsp16_op: | |
1144 | reg = insn.mm16_r5_format.rt; | |
1145 | goto loadW; | |
1146 | ||
1147 | case mm_swsp16_op: | |
1148 | reg = insn.mm16_r5_format.rt; | |
1149 | goto storeW; | |
1150 | ||
1151 | case mm_lwgp16_op: | |
1152 | reg = reg16to32[insn.mm16_r3_format.rt]; | |
1153 | goto loadW; | |
1154 | ||
1155 | default: | |
1156 | goto sigill; | |
1157 | } | |
1158 | ||
1159 | loadHW: | |
1160 | if (!access_ok(VERIFY_READ, addr, 2)) | |
1161 | goto sigbus; | |
1162 | ||
1163 | LoadHW(addr, value, res); | |
1164 | if (res) | |
1165 | goto fault; | |
1166 | regs->regs[reg] = value; | |
1167 | goto success; | |
1168 | ||
1169 | loadHWU: | |
1170 | if (!access_ok(VERIFY_READ, addr, 2)) | |
1171 | goto sigbus; | |
1172 | ||
1173 | LoadHWU(addr, value, res); | |
1174 | if (res) | |
1175 | goto fault; | |
1176 | regs->regs[reg] = value; | |
1177 | goto success; | |
1178 | ||
1179 | loadW: | |
1180 | if (!access_ok(VERIFY_READ, addr, 4)) | |
1181 | goto sigbus; | |
1182 | ||
1183 | LoadW(addr, value, res); | |
1184 | if (res) | |
1185 | goto fault; | |
1186 | regs->regs[reg] = value; | |
1187 | goto success; | |
1188 | ||
1189 | loadWU: | |
1190 | #ifdef CONFIG_64BIT | |
1191 | /* | |
1192 | * A 32-bit kernel might be running on a 64-bit processor. But | |
1193 | * if we're on a 32-bit processor and an i-cache incoherency | |
1194 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
1195 | * would blow up, so for now we don't handle unaligned 64-bit | |
1196 | * instructions on 32-bit kernels. | |
1197 | */ | |
1198 | if (!access_ok(VERIFY_READ, addr, 4)) | |
1199 | goto sigbus; | |
1200 | ||
1201 | LoadWU(addr, value, res); | |
1202 | if (res) | |
1203 | goto fault; | |
1204 | regs->regs[reg] = value; | |
1205 | goto success; | |
1206 | #endif /* CONFIG_64BIT */ | |
1207 | ||
1208 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
1209 | goto sigill; | |
1210 | ||
1211 | loadDW: | |
1212 | #ifdef CONFIG_64BIT | |
1213 | /* | |
1214 | * A 32-bit kernel might be running on a 64-bit processor. But | |
1215 | * if we're on a 32-bit processor and an i-cache incoherency | |
1216 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
1217 | * would blow up, so for now we don't handle unaligned 64-bit | |
1218 | * instructions on 32-bit kernels. | |
1219 | */ | |
1220 | if (!access_ok(VERIFY_READ, addr, 8)) | |
1221 | goto sigbus; | |
1222 | ||
1223 | LoadDW(addr, value, res); | |
1224 | if (res) | |
1225 | goto fault; | |
1226 | regs->regs[reg] = value; | |
1227 | goto success; | |
1228 | #endif /* CONFIG_64BIT */ | |
1229 | ||
1230 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
1231 | goto sigill; | |
1232 | ||
1233 | storeHW: | |
1234 | if (!access_ok(VERIFY_WRITE, addr, 2)) | |
1235 | goto sigbus; | |
1236 | ||
1237 | value = regs->regs[reg]; | |
1238 | StoreHW(addr, value, res); | |
1239 | if (res) | |
1240 | goto fault; | |
1241 | goto success; | |
1242 | ||
1243 | storeW: | |
1244 | if (!access_ok(VERIFY_WRITE, addr, 4)) | |
1245 | goto sigbus; | |
1246 | ||
1247 | value = regs->regs[reg]; | |
1248 | StoreW(addr, value, res); | |
1249 | if (res) | |
1250 | goto fault; | |
1251 | goto success; | |
1252 | ||
1253 | storeDW: | |
1254 | #ifdef CONFIG_64BIT | |
1255 | /* | |
1256 | * A 32-bit kernel might be running on a 64-bit processor. But | |
1257 | * if we're on a 32-bit processor and an i-cache incoherency | |
1258 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
1259 | * would blow up, so for now we don't handle unaligned 64-bit | |
1260 | * instructions on 32-bit kernels. | |
1261 | */ | |
1262 | if (!access_ok(VERIFY_WRITE, addr, 8)) | |
1263 | goto sigbus; | |
1264 | ||
1265 | value = regs->regs[reg]; | |
1266 | StoreDW(addr, value, res); | |
1267 | if (res) | |
1268 | goto fault; | |
1269 | goto success; | |
1270 | #endif /* CONFIG_64BIT */ | |
1271 | ||
1272 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
1273 | goto sigill; | |
1274 | ||
1275 | success: | |
1276 | regs->cp0_epc = contpc; /* advance or branch */ | |
1277 | ||
1278 | #ifdef CONFIG_DEBUG_FS | |
1279 | unaligned_instructions++; | |
1280 | #endif | |
1281 | return; | |
1282 | ||
1283 | fault: | |
1284 | /* roll back jump/branch */ | |
1285 | regs->cp0_epc = origpc; | |
1286 | regs->regs[31] = orig31; | |
1da177e4 LT |
1287 | /* Did we have an exception handler installed? */ |
1288 | if (fixup_exception(regs)) | |
7f18f151 | 1289 | return; |
1da177e4 | 1290 | |
49a89efb | 1291 | die_if_kernel("Unhandled kernel unaligned access", regs); |
a6d5ff04 | 1292 | force_sig(SIGSEGV, current); |
1da177e4 | 1293 | |
7f18f151 | 1294 | return; |
1da177e4 LT |
1295 | |
1296 | sigbus: | |
1297 | die_if_kernel("Unhandled kernel unaligned access", regs); | |
a6d5ff04 | 1298 | force_sig(SIGBUS, current); |
1da177e4 | 1299 | |
7f18f151 | 1300 | return; |
1da177e4 LT |
1301 | |
1302 | sigill: | |
34c2f668 LY |
1303 | die_if_kernel |
1304 | ("Unhandled kernel unaligned access or invalid instruction", regs); | |
a6d5ff04 | 1305 | force_sig(SIGILL, current); |
1da177e4 LT |
1306 | } |
1307 | ||
451b001b SH |
1308 | static void emulate_load_store_MIPS16e(struct pt_regs *regs, void __user * addr) |
1309 | { | |
1310 | unsigned long value; | |
1311 | unsigned int res; | |
1312 | int reg; | |
1313 | unsigned long orig31; | |
1314 | u16 __user *pc16; | |
1315 | unsigned long origpc; | |
1316 | union mips16e_instruction mips16inst, oldinst; | |
1317 | ||
1318 | origpc = regs->cp0_epc; | |
1319 | orig31 = regs->regs[31]; | |
1320 | pc16 = (unsigned short __user *)msk_isa16_mode(origpc); | |
1321 | /* | |
1322 | * This load never faults. | |
1323 | */ | |
1324 | __get_user(mips16inst.full, pc16); | |
1325 | oldinst = mips16inst; | |
1326 | ||
1327 | /* skip EXTEND instruction */ | |
1328 | if (mips16inst.ri.opcode == MIPS16e_extend_op) { | |
1329 | pc16++; | |
1330 | __get_user(mips16inst.full, pc16); | |
1331 | } else if (delay_slot(regs)) { | |
1332 | /* skip jump instructions */ | |
1333 | /* JAL/JALX are 32 bits but have OPCODE in first short int */ | |
1334 | if (mips16inst.ri.opcode == MIPS16e_jal_op) | |
1335 | pc16++; | |
1336 | pc16++; | |
1337 | if (get_user(mips16inst.full, pc16)) | |
1338 | goto sigbus; | |
1339 | } | |
1340 | ||
1341 | switch (mips16inst.ri.opcode) { | |
1342 | case MIPS16e_i64_op: /* I64 or RI64 instruction */ | |
1343 | switch (mips16inst.i64.func) { /* I64/RI64 func field check */ | |
1344 | case MIPS16e_ldpc_func: | |
1345 | case MIPS16e_ldsp_func: | |
1346 | reg = reg16to32[mips16inst.ri64.ry]; | |
1347 | goto loadDW; | |
1348 | ||
1349 | case MIPS16e_sdsp_func: | |
1350 | reg = reg16to32[mips16inst.ri64.ry]; | |
1351 | goto writeDW; | |
1352 | ||
1353 | case MIPS16e_sdrasp_func: | |
1354 | reg = 29; /* GPRSP */ | |
1355 | goto writeDW; | |
1356 | } | |
1357 | ||
1358 | goto sigbus; | |
1359 | ||
1360 | case MIPS16e_swsp_op: | |
1361 | case MIPS16e_lwpc_op: | |
1362 | case MIPS16e_lwsp_op: | |
1363 | reg = reg16to32[mips16inst.ri.rx]; | |
1364 | break; | |
1365 | ||
1366 | case MIPS16e_i8_op: | |
1367 | if (mips16inst.i8.func != MIPS16e_swrasp_func) | |
1368 | goto sigbus; | |
1369 | reg = 29; /* GPRSP */ | |
1370 | break; | |
1371 | ||
1372 | default: | |
1373 | reg = reg16to32[mips16inst.rri.ry]; | |
1374 | break; | |
1375 | } | |
1376 | ||
1377 | switch (mips16inst.ri.opcode) { | |
1378 | ||
1379 | case MIPS16e_lb_op: | |
1380 | case MIPS16e_lbu_op: | |
1381 | case MIPS16e_sb_op: | |
1382 | goto sigbus; | |
1383 | ||
1384 | case MIPS16e_lh_op: | |
1385 | if (!access_ok(VERIFY_READ, addr, 2)) | |
1386 | goto sigbus; | |
1387 | ||
1388 | LoadHW(addr, value, res); | |
1389 | if (res) | |
1390 | goto fault; | |
1391 | MIPS16e_compute_return_epc(regs, &oldinst); | |
1392 | regs->regs[reg] = value; | |
1393 | break; | |
1394 | ||
1395 | case MIPS16e_lhu_op: | |
1396 | if (!access_ok(VERIFY_READ, addr, 2)) | |
1397 | goto sigbus; | |
1398 | ||
1399 | LoadHWU(addr, value, res); | |
1400 | if (res) | |
1401 | goto fault; | |
1402 | MIPS16e_compute_return_epc(regs, &oldinst); | |
1403 | regs->regs[reg] = value; | |
1404 | break; | |
1405 | ||
1406 | case MIPS16e_lw_op: | |
1407 | case MIPS16e_lwpc_op: | |
1408 | case MIPS16e_lwsp_op: | |
1409 | if (!access_ok(VERIFY_READ, addr, 4)) | |
1410 | goto sigbus; | |
1411 | ||
1412 | LoadW(addr, value, res); | |
1413 | if (res) | |
1414 | goto fault; | |
1415 | MIPS16e_compute_return_epc(regs, &oldinst); | |
1416 | regs->regs[reg] = value; | |
1417 | break; | |
1418 | ||
1419 | case MIPS16e_lwu_op: | |
1420 | #ifdef CONFIG_64BIT | |
1421 | /* | |
1422 | * A 32-bit kernel might be running on a 64-bit processor. But | |
1423 | * if we're on a 32-bit processor and an i-cache incoherency | |
1424 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
1425 | * would blow up, so for now we don't handle unaligned 64-bit | |
1426 | * instructions on 32-bit kernels. | |
1427 | */ | |
1428 | if (!access_ok(VERIFY_READ, addr, 4)) | |
1429 | goto sigbus; | |
1430 | ||
1431 | LoadWU(addr, value, res); | |
1432 | if (res) | |
1433 | goto fault; | |
1434 | MIPS16e_compute_return_epc(regs, &oldinst); | |
1435 | regs->regs[reg] = value; | |
1436 | break; | |
1437 | #endif /* CONFIG_64BIT */ | |
1438 | ||
1439 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
1440 | goto sigill; | |
1441 | ||
1442 | case MIPS16e_ld_op: | |
1443 | loadDW: | |
1444 | #ifdef CONFIG_64BIT | |
1445 | /* | |
1446 | * A 32-bit kernel might be running on a 64-bit processor. But | |
1447 | * if we're on a 32-bit processor and an i-cache incoherency | |
1448 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
1449 | * would blow up, so for now we don't handle unaligned 64-bit | |
1450 | * instructions on 32-bit kernels. | |
1451 | */ | |
1452 | if (!access_ok(VERIFY_READ, addr, 8)) | |
1453 | goto sigbus; | |
1454 | ||
1455 | LoadDW(addr, value, res); | |
1456 | if (res) | |
1457 | goto fault; | |
1458 | MIPS16e_compute_return_epc(regs, &oldinst); | |
1459 | regs->regs[reg] = value; | |
1460 | break; | |
1461 | #endif /* CONFIG_64BIT */ | |
1462 | ||
1463 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
1464 | goto sigill; | |
1465 | ||
1466 | case MIPS16e_sh_op: | |
1467 | if (!access_ok(VERIFY_WRITE, addr, 2)) | |
1468 | goto sigbus; | |
1469 | ||
1470 | MIPS16e_compute_return_epc(regs, &oldinst); | |
1471 | value = regs->regs[reg]; | |
1472 | StoreHW(addr, value, res); | |
1473 | if (res) | |
1474 | goto fault; | |
1475 | break; | |
1476 | ||
1477 | case MIPS16e_sw_op: | |
1478 | case MIPS16e_swsp_op: | |
1479 | case MIPS16e_i8_op: /* actually - MIPS16e_swrasp_func */ | |
1480 | if (!access_ok(VERIFY_WRITE, addr, 4)) | |
1481 | goto sigbus; | |
1482 | ||
1483 | MIPS16e_compute_return_epc(regs, &oldinst); | |
1484 | value = regs->regs[reg]; | |
1485 | StoreW(addr, value, res); | |
1486 | if (res) | |
1487 | goto fault; | |
1488 | break; | |
1489 | ||
1490 | case MIPS16e_sd_op: | |
1491 | writeDW: | |
1492 | #ifdef CONFIG_64BIT | |
1493 | /* | |
1494 | * A 32-bit kernel might be running on a 64-bit processor. But | |
1495 | * if we're on a 32-bit processor and an i-cache incoherency | |
1496 | * or race makes us see a 64-bit instruction here the sdl/sdr | |
1497 | * would blow up, so for now we don't handle unaligned 64-bit | |
1498 | * instructions on 32-bit kernels. | |
1499 | */ | |
1500 | if (!access_ok(VERIFY_WRITE, addr, 8)) | |
1501 | goto sigbus; | |
1502 | ||
1503 | MIPS16e_compute_return_epc(regs, &oldinst); | |
1504 | value = regs->regs[reg]; | |
1505 | StoreDW(addr, value, res); | |
1506 | if (res) | |
1507 | goto fault; | |
1508 | break; | |
1509 | #endif /* CONFIG_64BIT */ | |
1510 | ||
1511 | /* Cannot handle 64-bit instructions in 32-bit kernel */ | |
1512 | goto sigill; | |
1513 | ||
1514 | default: | |
1515 | /* | |
1516 | * Pheeee... We encountered an yet unknown instruction or | |
1517 | * cache coherence problem. Die sucker, die ... | |
1518 | */ | |
1519 | goto sigill; | |
1520 | } | |
1521 | ||
1522 | #ifdef CONFIG_DEBUG_FS | |
1523 | unaligned_instructions++; | |
1524 | #endif | |
1525 | ||
1526 | return; | |
1527 | ||
1528 | fault: | |
1529 | /* roll back jump/branch */ | |
1530 | regs->cp0_epc = origpc; | |
1531 | regs->regs[31] = orig31; | |
1532 | /* Did we have an exception handler installed? */ | |
1533 | if (fixup_exception(regs)) | |
1534 | return; | |
1535 | ||
1536 | die_if_kernel("Unhandled kernel unaligned access", regs); | |
1537 | force_sig(SIGSEGV, current); | |
1538 | ||
1539 | return; | |
1540 | ||
1541 | sigbus: | |
1542 | die_if_kernel("Unhandled kernel unaligned access", regs); | |
1543 | force_sig(SIGBUS, current); | |
1544 | ||
1545 | return; | |
1546 | ||
1547 | sigill: | |
1548 | die_if_kernel | |
1549 | ("Unhandled kernel unaligned access or invalid instruction", regs); | |
1550 | force_sig(SIGILL, current); | |
1551 | } | |
1da177e4 LT |
1552 | asmlinkage void do_ade(struct pt_regs *regs) |
1553 | { | |
c3fc5cd5 | 1554 | enum ctx_state prev_state; |
fe00f943 | 1555 | unsigned int __user *pc; |
1da177e4 | 1556 | mm_segment_t seg; |
1da177e4 | 1557 | |
c3fc5cd5 | 1558 | prev_state = exception_enter(); |
7f788d2d | 1559 | perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, |
a8b0ca17 | 1560 | 1, regs, regs->cp0_badvaddr); |
1da177e4 LT |
1561 | /* |
1562 | * Did we catch a fault trying to load an instruction? | |
1da177e4 | 1563 | */ |
34c2f668 | 1564 | if (regs->cp0_badvaddr == regs->cp0_epc) |
1da177e4 LT |
1565 | goto sigbus; |
1566 | ||
293c5bd1 | 1567 | if (user_mode(regs) && !test_thread_flag(TIF_FIXADE)) |
1da177e4 | 1568 | goto sigbus; |
6312e0ee AN |
1569 | if (unaligned_action == UNALIGNED_ACTION_SIGNAL) |
1570 | goto sigbus; | |
1da177e4 LT |
1571 | |
1572 | /* | |
1573 | * Do branch emulation only if we didn't forward the exception. | |
1574 | * This is all so but ugly ... | |
1575 | */ | |
34c2f668 LY |
1576 | |
1577 | /* | |
1578 | * Are we running in microMIPS mode? | |
1579 | */ | |
1580 | if (get_isa16_mode(regs->cp0_epc)) { | |
1581 | /* | |
1582 | * Did we catch a fault trying to load an instruction in | |
1583 | * 16-bit mode? | |
1584 | */ | |
1585 | if (regs->cp0_badvaddr == msk_isa16_mode(regs->cp0_epc)) | |
1586 | goto sigbus; | |
1587 | if (unaligned_action == UNALIGNED_ACTION_SHOW) | |
1588 | show_registers(regs); | |
1589 | ||
1590 | if (cpu_has_mmips) { | |
1591 | seg = get_fs(); | |
1592 | if (!user_mode(regs)) | |
1593 | set_fs(KERNEL_DS); | |
1594 | emulate_load_store_microMIPS(regs, | |
1595 | (void __user *)regs->cp0_badvaddr); | |
1596 | set_fs(seg); | |
1597 | ||
1598 | return; | |
1599 | } | |
1600 | ||
451b001b SH |
1601 | if (cpu_has_mips16) { |
1602 | seg = get_fs(); | |
1603 | if (!user_mode(regs)) | |
1604 | set_fs(KERNEL_DS); | |
1605 | emulate_load_store_MIPS16e(regs, | |
1606 | (void __user *)regs->cp0_badvaddr); | |
1607 | set_fs(seg); | |
1608 | ||
1609 | return; | |
1610 | } | |
1611 | ||
34c2f668 LY |
1612 | goto sigbus; |
1613 | } | |
1614 | ||
1615 | if (unaligned_action == UNALIGNED_ACTION_SHOW) | |
1616 | show_registers(regs); | |
1617 | pc = (unsigned int __user *)exception_epc(regs); | |
1618 | ||
1da177e4 LT |
1619 | seg = get_fs(); |
1620 | if (!user_mode(regs)) | |
1621 | set_fs(KERNEL_DS); | |
7f18f151 | 1622 | emulate_load_store_insn(regs, (void __user *)regs->cp0_badvaddr, pc); |
1da177e4 LT |
1623 | set_fs(seg); |
1624 | ||
1625 | return; | |
1626 | ||
1627 | sigbus: | |
1628 | die_if_kernel("Kernel unaligned instruction access", regs); | |
1629 | force_sig(SIGBUS, current); | |
1630 | ||
1631 | /* | |
1632 | * XXX On return from the signal handler we should advance the epc | |
1633 | */ | |
c3fc5cd5 | 1634 | exception_exit(prev_state); |
1da177e4 | 1635 | } |
6312e0ee AN |
1636 | |
1637 | #ifdef CONFIG_DEBUG_FS | |
1638 | extern struct dentry *mips_debugfs_dir; | |
1639 | static int __init debugfs_unaligned(void) | |
1640 | { | |
1641 | struct dentry *d; | |
1642 | ||
1643 | if (!mips_debugfs_dir) | |
1644 | return -ENODEV; | |
1645 | d = debugfs_create_u32("unaligned_instructions", S_IRUGO, | |
1646 | mips_debugfs_dir, &unaligned_instructions); | |
b517531c Z |
1647 | if (!d) |
1648 | return -ENOMEM; | |
6312e0ee AN |
1649 | d = debugfs_create_u32("unaligned_action", S_IRUGO | S_IWUSR, |
1650 | mips_debugfs_dir, &unaligned_action); | |
b517531c Z |
1651 | if (!d) |
1652 | return -ENOMEM; | |
6312e0ee AN |
1653 | return 0; |
1654 | } | |
1655 | __initcall(debugfs_unaligned); | |
1656 | #endif |