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drivers/net/wireless/intel/iwlwifi/dvm/calib.c: simplfy min() expression
[deliverable/linux.git] / arch / parisc / kernel / unaligned.c
1 /*
2 * Unaligned memory access handler
3 *
4 * Copyright (C) 2001 Randolph Chung <tausq@debian.org>
5 * Significantly tweaked by LaMont Jones <lamont@debian.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 */
22
23 #include <linux/jiffies.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/sched.h>
27 #include <linux/signal.h>
28 #include <linux/ratelimit.h>
29 #include <asm/uaccess.h>
30 #include <asm/hardirq.h>
31 #include <asm/traps.h>
32
33 /* #define DEBUG_UNALIGNED 1 */
34
35 #ifdef DEBUG_UNALIGNED
36 #define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __func__ ); printk(KERN_DEBUG fmt, ##args ); } while (0)
37 #else
38 #define DPRINTF(fmt, args...)
39 #endif
40
41 #ifdef CONFIG_64BIT
42 #define RFMT "%016lx"
43 #else
44 #define RFMT "%08lx"
45 #endif
46
47 #define FIXUP_BRANCH(lbl) \
48 "\tldil L%%" #lbl ", %%r1\n" \
49 "\tldo R%%" #lbl "(%%r1), %%r1\n" \
50 "\tbv,n %%r0(%%r1)\n"
51 /* If you use FIXUP_BRANCH, then you must list this clobber */
52 #define FIXUP_BRANCH_CLOBBER "r1"
53
54 /* 1111 1100 0000 0000 0001 0011 1100 0000 */
55 #define OPCODE1(a,b,c) ((a)<<26|(b)<<12|(c)<<6)
56 #define OPCODE2(a,b) ((a)<<26|(b)<<1)
57 #define OPCODE3(a,b) ((a)<<26|(b)<<2)
58 #define OPCODE4(a) ((a)<<26)
59 #define OPCODE1_MASK OPCODE1(0x3f,1,0xf)
60 #define OPCODE2_MASK OPCODE2(0x3f,1)
61 #define OPCODE3_MASK OPCODE3(0x3f,1)
62 #define OPCODE4_MASK OPCODE4(0x3f)
63
64 /* skip LDB - never unaligned (index) */
65 #define OPCODE_LDH_I OPCODE1(0x03,0,0x1)
66 #define OPCODE_LDW_I OPCODE1(0x03,0,0x2)
67 #define OPCODE_LDD_I OPCODE1(0x03,0,0x3)
68 #define OPCODE_LDDA_I OPCODE1(0x03,0,0x4)
69 #define OPCODE_LDCD_I OPCODE1(0x03,0,0x5)
70 #define OPCODE_LDWA_I OPCODE1(0x03,0,0x6)
71 #define OPCODE_LDCW_I OPCODE1(0x03,0,0x7)
72 /* skip LDB - never unaligned (short) */
73 #define OPCODE_LDH_S OPCODE1(0x03,1,0x1)
74 #define OPCODE_LDW_S OPCODE1(0x03,1,0x2)
75 #define OPCODE_LDD_S OPCODE1(0x03,1,0x3)
76 #define OPCODE_LDDA_S OPCODE1(0x03,1,0x4)
77 #define OPCODE_LDCD_S OPCODE1(0x03,1,0x5)
78 #define OPCODE_LDWA_S OPCODE1(0x03,1,0x6)
79 #define OPCODE_LDCW_S OPCODE1(0x03,1,0x7)
80 /* skip STB - never unaligned */
81 #define OPCODE_STH OPCODE1(0x03,1,0x9)
82 #define OPCODE_STW OPCODE1(0x03,1,0xa)
83 #define OPCODE_STD OPCODE1(0x03,1,0xb)
84 /* skip STBY - never unaligned */
85 /* skip STDBY - never unaligned */
86 #define OPCODE_STWA OPCODE1(0x03,1,0xe)
87 #define OPCODE_STDA OPCODE1(0x03,1,0xf)
88
89 #define OPCODE_FLDWX OPCODE1(0x09,0,0x0)
90 #define OPCODE_FLDWXR OPCODE1(0x09,0,0x1)
91 #define OPCODE_FSTWX OPCODE1(0x09,0,0x8)
92 #define OPCODE_FSTWXR OPCODE1(0x09,0,0x9)
93 #define OPCODE_FLDWS OPCODE1(0x09,1,0x0)
94 #define OPCODE_FLDWSR OPCODE1(0x09,1,0x1)
95 #define OPCODE_FSTWS OPCODE1(0x09,1,0x8)
96 #define OPCODE_FSTWSR OPCODE1(0x09,1,0x9)
97 #define OPCODE_FLDDX OPCODE1(0x0b,0,0x0)
98 #define OPCODE_FSTDX OPCODE1(0x0b,0,0x8)
99 #define OPCODE_FLDDS OPCODE1(0x0b,1,0x0)
100 #define OPCODE_FSTDS OPCODE1(0x0b,1,0x8)
101
102 #define OPCODE_LDD_L OPCODE2(0x14,0)
103 #define OPCODE_FLDD_L OPCODE2(0x14,1)
104 #define OPCODE_STD_L OPCODE2(0x1c,0)
105 #define OPCODE_FSTD_L OPCODE2(0x1c,1)
106
107 #define OPCODE_LDW_M OPCODE3(0x17,1)
108 #define OPCODE_FLDW_L OPCODE3(0x17,0)
109 #define OPCODE_FSTW_L OPCODE3(0x1f,0)
110 #define OPCODE_STW_M OPCODE3(0x1f,1)
111
112 #define OPCODE_LDH_L OPCODE4(0x11)
113 #define OPCODE_LDW_L OPCODE4(0x12)
114 #define OPCODE_LDWM OPCODE4(0x13)
115 #define OPCODE_STH_L OPCODE4(0x19)
116 #define OPCODE_STW_L OPCODE4(0x1A)
117 #define OPCODE_STWM OPCODE4(0x1B)
118
119 #define MAJOR_OP(i) (((i)>>26)&0x3f)
120 #define R1(i) (((i)>>21)&0x1f)
121 #define R2(i) (((i)>>16)&0x1f)
122 #define R3(i) ((i)&0x1f)
123 #define FR3(i) ((((i)<<1)&0x1f)|(((i)>>6)&1))
124 #define IM(i,n) (((i)>>1&((1<<(n-1))-1))|((i)&1?((0-1L)<<(n-1)):0))
125 #define IM5_2(i) IM((i)>>16,5)
126 #define IM5_3(i) IM((i),5)
127 #define IM14(i) IM((i),14)
128
129 #define ERR_NOTHANDLED -1
130 #define ERR_PAGEFAULT -2
131
132 int unaligned_enabled __read_mostly = 1;
133
134 static int emulate_ldh(struct pt_regs *regs, int toreg)
135 {
136 unsigned long saddr = regs->ior;
137 unsigned long val = 0;
138 int ret;
139
140 DPRINTF("load " RFMT ":" RFMT " to r%d for 2 bytes\n",
141 regs->isr, regs->ior, toreg);
142
143 __asm__ __volatile__ (
144 " mtsp %4, %%sr1\n"
145 "1: ldbs 0(%%sr1,%3), %%r20\n"
146 "2: ldbs 1(%%sr1,%3), %0\n"
147 " depw %%r20, 23, 24, %0\n"
148 " copy %%r0, %1\n"
149 "3: \n"
150 " .section .fixup,\"ax\"\n"
151 "4: ldi -2, %1\n"
152 FIXUP_BRANCH(3b)
153 " .previous\n"
154 ASM_EXCEPTIONTABLE_ENTRY(1b, 4b)
155 ASM_EXCEPTIONTABLE_ENTRY(2b, 4b)
156 : "=r" (val), "=r" (ret)
157 : "0" (val), "r" (saddr), "r" (regs->isr)
158 : "r20", FIXUP_BRANCH_CLOBBER );
159
160 DPRINTF("val = 0x" RFMT "\n", val);
161
162 if (toreg)
163 regs->gr[toreg] = val;
164
165 return ret;
166 }
167
168 static int emulate_ldw(struct pt_regs *regs, int toreg, int flop)
169 {
170 unsigned long saddr = regs->ior;
171 unsigned long val = 0;
172 int ret;
173
174 DPRINTF("load " RFMT ":" RFMT " to r%d for 4 bytes\n",
175 regs->isr, regs->ior, toreg);
176
177 __asm__ __volatile__ (
178 " zdep %3,28,2,%%r19\n" /* r19=(ofs&3)*8 */
179 " mtsp %4, %%sr1\n"
180 " depw %%r0,31,2,%3\n"
181 "1: ldw 0(%%sr1,%3),%0\n"
182 "2: ldw 4(%%sr1,%3),%%r20\n"
183 " subi 32,%%r19,%%r19\n"
184 " mtctl %%r19,11\n"
185 " vshd %0,%%r20,%0\n"
186 " copy %%r0, %1\n"
187 "3: \n"
188 " .section .fixup,\"ax\"\n"
189 "4: ldi -2, %1\n"
190 FIXUP_BRANCH(3b)
191 " .previous\n"
192 ASM_EXCEPTIONTABLE_ENTRY(1b, 4b)
193 ASM_EXCEPTIONTABLE_ENTRY(2b, 4b)
194 : "=r" (val), "=r" (ret)
195 : "0" (val), "r" (saddr), "r" (regs->isr)
196 : "r19", "r20", FIXUP_BRANCH_CLOBBER );
197
198 DPRINTF("val = 0x" RFMT "\n", val);
199
200 if (flop)
201 ((__u32*)(regs->fr))[toreg] = val;
202 else if (toreg)
203 regs->gr[toreg] = val;
204
205 return ret;
206 }
207 static int emulate_ldd(struct pt_regs *regs, int toreg, int flop)
208 {
209 unsigned long saddr = regs->ior;
210 __u64 val = 0;
211 int ret;
212
213 DPRINTF("load " RFMT ":" RFMT " to r%d for 8 bytes\n",
214 regs->isr, regs->ior, toreg);
215 #ifdef CONFIG_PA20
216
217 #ifndef CONFIG_64BIT
218 if (!flop)
219 return -1;
220 #endif
221 __asm__ __volatile__ (
222 " depd,z %3,60,3,%%r19\n" /* r19=(ofs&7)*8 */
223 " mtsp %4, %%sr1\n"
224 " depd %%r0,63,3,%3\n"
225 "1: ldd 0(%%sr1,%3),%0\n"
226 "2: ldd 8(%%sr1,%3),%%r20\n"
227 " subi 64,%%r19,%%r19\n"
228 " mtsar %%r19\n"
229 " shrpd %0,%%r20,%%sar,%0\n"
230 " copy %%r0, %1\n"
231 "3: \n"
232 " .section .fixup,\"ax\"\n"
233 "4: ldi -2, %1\n"
234 FIXUP_BRANCH(3b)
235 " .previous\n"
236 ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
237 ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
238 : "=r" (val), "=r" (ret)
239 : "0" (val), "r" (saddr), "r" (regs->isr)
240 : "r19", "r20", FIXUP_BRANCH_CLOBBER );
241 #else
242 {
243 unsigned long valh=0,vall=0;
244 __asm__ __volatile__ (
245 " zdep %5,29,2,%%r19\n" /* r19=(ofs&3)*8 */
246 " mtsp %6, %%sr1\n"
247 " dep %%r0,31,2,%5\n"
248 "1: ldw 0(%%sr1,%5),%0\n"
249 "2: ldw 4(%%sr1,%5),%1\n"
250 "3: ldw 8(%%sr1,%5),%%r20\n"
251 " subi 32,%%r19,%%r19\n"
252 " mtsar %%r19\n"
253 " vshd %0,%1,%0\n"
254 " vshd %1,%%r20,%1\n"
255 " copy %%r0, %2\n"
256 "4: \n"
257 " .section .fixup,\"ax\"\n"
258 "5: ldi -2, %2\n"
259 FIXUP_BRANCH(4b)
260 " .previous\n"
261 ASM_EXCEPTIONTABLE_ENTRY(1b,5b)
262 ASM_EXCEPTIONTABLE_ENTRY(2b,5b)
263 ASM_EXCEPTIONTABLE_ENTRY(3b,5b)
264 : "=r" (valh), "=r" (vall), "=r" (ret)
265 : "0" (valh), "1" (vall), "r" (saddr), "r" (regs->isr)
266 : "r19", "r20", FIXUP_BRANCH_CLOBBER );
267 val=((__u64)valh<<32)|(__u64)vall;
268 }
269 #endif
270
271 DPRINTF("val = 0x%llx\n", val);
272
273 if (flop)
274 regs->fr[toreg] = val;
275 else if (toreg)
276 regs->gr[toreg] = val;
277
278 return ret;
279 }
280
281 static int emulate_sth(struct pt_regs *regs, int frreg)
282 {
283 unsigned long val = regs->gr[frreg];
284 int ret;
285
286 if (!frreg)
287 val = 0;
288
289 DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 2 bytes\n", frreg,
290 val, regs->isr, regs->ior);
291
292 __asm__ __volatile__ (
293 " mtsp %3, %%sr1\n"
294 " extrw,u %1, 23, 8, %%r19\n"
295 "1: stb %1, 1(%%sr1, %2)\n"
296 "2: stb %%r19, 0(%%sr1, %2)\n"
297 " copy %%r0, %0\n"
298 "3: \n"
299 " .section .fixup,\"ax\"\n"
300 "4: ldi -2, %0\n"
301 FIXUP_BRANCH(3b)
302 " .previous\n"
303 ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
304 ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
305 : "=r" (ret)
306 : "r" (val), "r" (regs->ior), "r" (regs->isr)
307 : "r19", FIXUP_BRANCH_CLOBBER );
308
309 return ret;
310 }
311
312 static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
313 {
314 unsigned long val;
315 int ret;
316
317 if (flop)
318 val = ((__u32*)(regs->fr))[frreg];
319 else if (frreg)
320 val = regs->gr[frreg];
321 else
322 val = 0;
323
324 DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg,
325 val, regs->isr, regs->ior);
326
327
328 __asm__ __volatile__ (
329 " mtsp %3, %%sr1\n"
330 " zdep %2, 28, 2, %%r19\n"
331 " dep %%r0, 31, 2, %2\n"
332 " mtsar %%r19\n"
333 " depwi,z -2, %%sar, 32, %%r19\n"
334 "1: ldw 0(%%sr1,%2),%%r20\n"
335 "2: ldw 4(%%sr1,%2),%%r21\n"
336 " vshd %%r0, %1, %%r22\n"
337 " vshd %1, %%r0, %%r1\n"
338 " and %%r20, %%r19, %%r20\n"
339 " andcm %%r21, %%r19, %%r21\n"
340 " or %%r22, %%r20, %%r20\n"
341 " or %%r1, %%r21, %%r21\n"
342 " stw %%r20,0(%%sr1,%2)\n"
343 " stw %%r21,4(%%sr1,%2)\n"
344 " copy %%r0, %0\n"
345 "3: \n"
346 " .section .fixup,\"ax\"\n"
347 "4: ldi -2, %0\n"
348 FIXUP_BRANCH(3b)
349 " .previous\n"
350 ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
351 ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
352 : "=r" (ret)
353 : "r" (val), "r" (regs->ior), "r" (regs->isr)
354 : "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
355
356 return 0;
357 }
358 static int emulate_std(struct pt_regs *regs, int frreg, int flop)
359 {
360 __u64 val;
361 int ret;
362
363 if (flop)
364 val = regs->fr[frreg];
365 else if (frreg)
366 val = regs->gr[frreg];
367 else
368 val = 0;
369
370 DPRINTF("store r%d (0x%016llx) to " RFMT ":" RFMT " for 8 bytes\n", frreg,
371 val, regs->isr, regs->ior);
372
373 #ifdef CONFIG_PA20
374 #ifndef CONFIG_64BIT
375 if (!flop)
376 return -1;
377 #endif
378 __asm__ __volatile__ (
379 " mtsp %3, %%sr1\n"
380 " depd,z %2, 60, 3, %%r19\n"
381 " depd %%r0, 63, 3, %2\n"
382 " mtsar %%r19\n"
383 " depdi,z -2, %%sar, 64, %%r19\n"
384 "1: ldd 0(%%sr1,%2),%%r20\n"
385 "2: ldd 8(%%sr1,%2),%%r21\n"
386 " shrpd %%r0, %1, %%sar, %%r22\n"
387 " shrpd %1, %%r0, %%sar, %%r1\n"
388 " and %%r20, %%r19, %%r20\n"
389 " andcm %%r21, %%r19, %%r21\n"
390 " or %%r22, %%r20, %%r20\n"
391 " or %%r1, %%r21, %%r21\n"
392 "3: std %%r20,0(%%sr1,%2)\n"
393 "4: std %%r21,8(%%sr1,%2)\n"
394 " copy %%r0, %0\n"
395 "5: \n"
396 " .section .fixup,\"ax\"\n"
397 "6: ldi -2, %0\n"
398 FIXUP_BRANCH(5b)
399 " .previous\n"
400 ASM_EXCEPTIONTABLE_ENTRY(1b,6b)
401 ASM_EXCEPTIONTABLE_ENTRY(2b,6b)
402 ASM_EXCEPTIONTABLE_ENTRY(3b,6b)
403 ASM_EXCEPTIONTABLE_ENTRY(4b,6b)
404 : "=r" (ret)
405 : "r" (val), "r" (regs->ior), "r" (regs->isr)
406 : "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
407 #else
408 {
409 unsigned long valh=(val>>32),vall=(val&0xffffffffl);
410 __asm__ __volatile__ (
411 " mtsp %4, %%sr1\n"
412 " zdep %2, 29, 2, %%r19\n"
413 " dep %%r0, 31, 2, %2\n"
414 " mtsar %%r19\n"
415 " zvdepi -2, 32, %%r19\n"
416 "1: ldw 0(%%sr1,%3),%%r20\n"
417 "2: ldw 8(%%sr1,%3),%%r21\n"
418 " vshd %1, %2, %%r1\n"
419 " vshd %%r0, %1, %1\n"
420 " vshd %2, %%r0, %2\n"
421 " and %%r20, %%r19, %%r20\n"
422 " andcm %%r21, %%r19, %%r21\n"
423 " or %1, %%r20, %1\n"
424 " or %2, %%r21, %2\n"
425 "3: stw %1,0(%%sr1,%1)\n"
426 "4: stw %%r1,4(%%sr1,%3)\n"
427 "5: stw %2,8(%%sr1,%3)\n"
428 " copy %%r0, %0\n"
429 "6: \n"
430 " .section .fixup,\"ax\"\n"
431 "7: ldi -2, %0\n"
432 FIXUP_BRANCH(6b)
433 " .previous\n"
434 ASM_EXCEPTIONTABLE_ENTRY(1b,7b)
435 ASM_EXCEPTIONTABLE_ENTRY(2b,7b)
436 ASM_EXCEPTIONTABLE_ENTRY(3b,7b)
437 ASM_EXCEPTIONTABLE_ENTRY(4b,7b)
438 ASM_EXCEPTIONTABLE_ENTRY(5b,7b)
439 : "=r" (ret)
440 : "r" (valh), "r" (vall), "r" (regs->ior), "r" (regs->isr)
441 : "r19", "r20", "r21", "r1", FIXUP_BRANCH_CLOBBER );
442 }
443 #endif
444
445 return ret;
446 }
447
448 void handle_unaligned(struct pt_regs *regs)
449 {
450 static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
451 unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
452 int modify = 0;
453 int ret = ERR_NOTHANDLED;
454 struct siginfo si;
455 register int flop=0; /* true if this is a flop */
456
457 __inc_irq_stat(irq_unaligned_count);
458
459 /* log a message with pacing */
460 if (user_mode(regs)) {
461 if (current->thread.flags & PARISC_UAC_SIGBUS) {
462 goto force_sigbus;
463 }
464
465 if (!(current->thread.flags & PARISC_UAC_NOPRINT) &&
466 __ratelimit(&ratelimit)) {
467 char buf[256];
468 sprintf(buf, "%s(%d): unaligned access to 0x" RFMT " at ip=0x" RFMT "\n",
469 current->comm, task_pid_nr(current), regs->ior, regs->iaoq[0]);
470 printk(KERN_WARNING "%s", buf);
471 #ifdef DEBUG_UNALIGNED
472 show_regs(regs);
473 #endif
474 }
475
476 if (!unaligned_enabled)
477 goto force_sigbus;
478 }
479
480 /* handle modification - OK, it's ugly, see the instruction manual */
481 switch (MAJOR_OP(regs->iir))
482 {
483 case 0x03:
484 case 0x09:
485 case 0x0b:
486 if (regs->iir&0x20)
487 {
488 modify = 1;
489 if (regs->iir&0x1000) /* short loads */
490 if (regs->iir&0x200)
491 newbase += IM5_3(regs->iir);
492 else
493 newbase += IM5_2(regs->iir);
494 else if (regs->iir&0x2000) /* scaled indexed */
495 {
496 int shift=0;
497 switch (regs->iir & OPCODE1_MASK)
498 {
499 case OPCODE_LDH_I:
500 shift= 1; break;
501 case OPCODE_LDW_I:
502 shift= 2; break;
503 case OPCODE_LDD_I:
504 case OPCODE_LDDA_I:
505 shift= 3; break;
506 }
507 newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0)<<shift;
508 } else /* simple indexed */
509 newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0);
510 }
511 break;
512 case 0x13:
513 case 0x1b:
514 modify = 1;
515 newbase += IM14(regs->iir);
516 break;
517 case 0x14:
518 case 0x1c:
519 if (regs->iir&8)
520 {
521 modify = 1;
522 newbase += IM14(regs->iir&~0xe);
523 }
524 break;
525 case 0x16:
526 case 0x1e:
527 modify = 1;
528 newbase += IM14(regs->iir&6);
529 break;
530 case 0x17:
531 case 0x1f:
532 if (regs->iir&4)
533 {
534 modify = 1;
535 newbase += IM14(regs->iir&~4);
536 }
537 break;
538 }
539
540 /* TODO: make this cleaner... */
541 switch (regs->iir & OPCODE1_MASK)
542 {
543 case OPCODE_LDH_I:
544 case OPCODE_LDH_S:
545 ret = emulate_ldh(regs, R3(regs->iir));
546 break;
547
548 case OPCODE_LDW_I:
549 case OPCODE_LDWA_I:
550 case OPCODE_LDW_S:
551 case OPCODE_LDWA_S:
552 ret = emulate_ldw(regs, R3(regs->iir),0);
553 break;
554
555 case OPCODE_STH:
556 ret = emulate_sth(regs, R2(regs->iir));
557 break;
558
559 case OPCODE_STW:
560 case OPCODE_STWA:
561 ret = emulate_stw(regs, R2(regs->iir),0);
562 break;
563
564 #ifdef CONFIG_PA20
565 case OPCODE_LDD_I:
566 case OPCODE_LDDA_I:
567 case OPCODE_LDD_S:
568 case OPCODE_LDDA_S:
569 ret = emulate_ldd(regs, R3(regs->iir),0);
570 break;
571
572 case OPCODE_STD:
573 case OPCODE_STDA:
574 ret = emulate_std(regs, R2(regs->iir),0);
575 break;
576 #endif
577
578 case OPCODE_FLDWX:
579 case OPCODE_FLDWS:
580 case OPCODE_FLDWXR:
581 case OPCODE_FLDWSR:
582 flop=1;
583 ret = emulate_ldw(regs,FR3(regs->iir),1);
584 break;
585
586 case OPCODE_FLDDX:
587 case OPCODE_FLDDS:
588 flop=1;
589 ret = emulate_ldd(regs,R3(regs->iir),1);
590 break;
591
592 case OPCODE_FSTWX:
593 case OPCODE_FSTWS:
594 case OPCODE_FSTWXR:
595 case OPCODE_FSTWSR:
596 flop=1;
597 ret = emulate_stw(regs,FR3(regs->iir),1);
598 break;
599
600 case OPCODE_FSTDX:
601 case OPCODE_FSTDS:
602 flop=1;
603 ret = emulate_std(regs,R3(regs->iir),1);
604 break;
605
606 case OPCODE_LDCD_I:
607 case OPCODE_LDCW_I:
608 case OPCODE_LDCD_S:
609 case OPCODE_LDCW_S:
610 ret = ERR_NOTHANDLED; /* "undefined", but lets kill them. */
611 break;
612 }
613 #ifdef CONFIG_PA20
614 switch (regs->iir & OPCODE2_MASK)
615 {
616 case OPCODE_FLDD_L:
617 flop=1;
618 ret = emulate_ldd(regs,R2(regs->iir),1);
619 break;
620 case OPCODE_FSTD_L:
621 flop=1;
622 ret = emulate_std(regs, R2(regs->iir),1);
623 break;
624 case OPCODE_LDD_L:
625 ret = emulate_ldd(regs, R2(regs->iir),0);
626 break;
627 case OPCODE_STD_L:
628 ret = emulate_std(regs, R2(regs->iir),0);
629 break;
630 }
631 #endif
632 switch (regs->iir & OPCODE3_MASK)
633 {
634 case OPCODE_FLDW_L:
635 flop=1;
636 ret = emulate_ldw(regs, R2(regs->iir),0);
637 break;
638 case OPCODE_LDW_M:
639 ret = emulate_ldw(regs, R2(regs->iir),1);
640 break;
641
642 case OPCODE_FSTW_L:
643 flop=1;
644 ret = emulate_stw(regs, R2(regs->iir),1);
645 break;
646 case OPCODE_STW_M:
647 ret = emulate_stw(regs, R2(regs->iir),0);
648 break;
649 }
650 switch (regs->iir & OPCODE4_MASK)
651 {
652 case OPCODE_LDH_L:
653 ret = emulate_ldh(regs, R2(regs->iir));
654 break;
655 case OPCODE_LDW_L:
656 case OPCODE_LDWM:
657 ret = emulate_ldw(regs, R2(regs->iir),0);
658 break;
659 case OPCODE_STH_L:
660 ret = emulate_sth(regs, R2(regs->iir));
661 break;
662 case OPCODE_STW_L:
663 case OPCODE_STWM:
664 ret = emulate_stw(regs, R2(regs->iir),0);
665 break;
666 }
667
668 if (ret == 0 && modify && R1(regs->iir))
669 regs->gr[R1(regs->iir)] = newbase;
670
671
672 if (ret == ERR_NOTHANDLED)
673 printk(KERN_CRIT "Not-handled unaligned insn 0x%08lx\n", regs->iir);
674
675 DPRINTF("ret = %d\n", ret);
676
677 if (ret)
678 {
679 /*
680 * The unaligned handler failed.
681 * If we were called by __get_user() or __put_user() jump
682 * to it's exception fixup handler instead of crashing.
683 */
684 if (!user_mode(regs) && fixup_exception(regs))
685 return;
686
687 printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret);
688 die_if_kernel("Unaligned data reference", regs, 28);
689
690 if (ret == ERR_PAGEFAULT)
691 {
692 si.si_signo = SIGSEGV;
693 si.si_errno = 0;
694 si.si_code = SEGV_MAPERR;
695 si.si_addr = (void __user *)regs->ior;
696 force_sig_info(SIGSEGV, &si, current);
697 }
698 else
699 {
700 force_sigbus:
701 /* couldn't handle it ... */
702 si.si_signo = SIGBUS;
703 si.si_errno = 0;
704 si.si_code = BUS_ADRALN;
705 si.si_addr = (void __user *)regs->ior;
706 force_sig_info(SIGBUS, &si, current);
707 }
708
709 return;
710 }
711
712 /* else we handled it, let life go on. */
713 regs->gr[0]|=PSW_N;
714 }
715
716 /*
717 * NB: check_unaligned() is only used for PCXS processors right
718 * now, so we only check for PA1.1 encodings at this point.
719 */
720
721 int
722 check_unaligned(struct pt_regs *regs)
723 {
724 unsigned long align_mask;
725
726 /* Get alignment mask */
727
728 align_mask = 0UL;
729 switch (regs->iir & OPCODE1_MASK) {
730
731 case OPCODE_LDH_I:
732 case OPCODE_LDH_S:
733 case OPCODE_STH:
734 align_mask = 1UL;
735 break;
736
737 case OPCODE_LDW_I:
738 case OPCODE_LDWA_I:
739 case OPCODE_LDW_S:
740 case OPCODE_LDWA_S:
741 case OPCODE_STW:
742 case OPCODE_STWA:
743 align_mask = 3UL;
744 break;
745
746 default:
747 switch (regs->iir & OPCODE4_MASK) {
748 case OPCODE_LDH_L:
749 case OPCODE_STH_L:
750 align_mask = 1UL;
751 break;
752 case OPCODE_LDW_L:
753 case OPCODE_LDWM:
754 case OPCODE_STW_L:
755 case OPCODE_STWM:
756 align_mask = 3UL;
757 break;
758 }
759 break;
760 }
761
762 return (int)(regs->ior & align_mask);
763 }
764
Linux kernel - Deliverables
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