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Merge tag 'irqchip-fixes-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/maz...
[mirror_ubuntu-jammy-kernel.git] / arch / parisc / kernel / unaligned.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Unaligned memory access handler
4 *
5 * Copyright (C) 2001 Randolph Chung <tausq@debian.org>
6 * Significantly tweaked by LaMont Jones <lamont@debian.org>
7 */
8
9 #include <linux/jiffies.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/sched/signal.h>
13 #include <linux/sched/debug.h>
14 #include <linux/signal.h>
15 #include <linux/ratelimit.h>
16 #include <linux/uaccess.h>
17 #include <asm/hardirq.h>
18 #include <asm/traps.h>
19
20 /* #define DEBUG_UNALIGNED 1 */
21
22 #ifdef DEBUG_UNALIGNED
23 #define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __func__ ); printk(KERN_DEBUG fmt, ##args ); } while (0)
24 #else
25 #define DPRINTF(fmt, args...)
26 #endif
27
28 #ifdef CONFIG_64BIT
29 #define RFMT "%016lx"
30 #else
31 #define RFMT "%08lx"
32 #endif
33
34 #define FIXUP_BRANCH(lbl) \
35 "\tldil L%%" #lbl ", %%r1\n" \
36 "\tldo R%%" #lbl "(%%r1), %%r1\n" \
37 "\tbv,n %%r0(%%r1)\n"
38 /* If you use FIXUP_BRANCH, then you must list this clobber */
39 #define FIXUP_BRANCH_CLOBBER "r1"
40
41 /* 1111 1100 0000 0000 0001 0011 1100 0000 */
42 #define OPCODE1(a,b,c) ((a)<<26|(b)<<12|(c)<<6)
43 #define OPCODE2(a,b) ((a)<<26|(b)<<1)
44 #define OPCODE3(a,b) ((a)<<26|(b)<<2)
45 #define OPCODE4(a) ((a)<<26)
46 #define OPCODE1_MASK OPCODE1(0x3f,1,0xf)
47 #define OPCODE2_MASK OPCODE2(0x3f,1)
48 #define OPCODE3_MASK OPCODE3(0x3f,1)
49 #define OPCODE4_MASK OPCODE4(0x3f)
50
51 /* skip LDB - never unaligned (index) */
52 #define OPCODE_LDH_I OPCODE1(0x03,0,0x1)
53 #define OPCODE_LDW_I OPCODE1(0x03,0,0x2)
54 #define OPCODE_LDD_I OPCODE1(0x03,0,0x3)
55 #define OPCODE_LDDA_I OPCODE1(0x03,0,0x4)
56 #define OPCODE_LDCD_I OPCODE1(0x03,0,0x5)
57 #define OPCODE_LDWA_I OPCODE1(0x03,0,0x6)
58 #define OPCODE_LDCW_I OPCODE1(0x03,0,0x7)
59 /* skip LDB - never unaligned (short) */
60 #define OPCODE_LDH_S OPCODE1(0x03,1,0x1)
61 #define OPCODE_LDW_S OPCODE1(0x03,1,0x2)
62 #define OPCODE_LDD_S OPCODE1(0x03,1,0x3)
63 #define OPCODE_LDDA_S OPCODE1(0x03,1,0x4)
64 #define OPCODE_LDCD_S OPCODE1(0x03,1,0x5)
65 #define OPCODE_LDWA_S OPCODE1(0x03,1,0x6)
66 #define OPCODE_LDCW_S OPCODE1(0x03,1,0x7)
67 /* skip STB - never unaligned */
68 #define OPCODE_STH OPCODE1(0x03,1,0x9)
69 #define OPCODE_STW OPCODE1(0x03,1,0xa)
70 #define OPCODE_STD OPCODE1(0x03,1,0xb)
71 /* skip STBY - never unaligned */
72 /* skip STDBY - never unaligned */
73 #define OPCODE_STWA OPCODE1(0x03,1,0xe)
74 #define OPCODE_STDA OPCODE1(0x03,1,0xf)
75
76 #define OPCODE_FLDWX OPCODE1(0x09,0,0x0)
77 #define OPCODE_FLDWXR OPCODE1(0x09,0,0x1)
78 #define OPCODE_FSTWX OPCODE1(0x09,0,0x8)
79 #define OPCODE_FSTWXR OPCODE1(0x09,0,0x9)
80 #define OPCODE_FLDWS OPCODE1(0x09,1,0x0)
81 #define OPCODE_FLDWSR OPCODE1(0x09,1,0x1)
82 #define OPCODE_FSTWS OPCODE1(0x09,1,0x8)
83 #define OPCODE_FSTWSR OPCODE1(0x09,1,0x9)
84 #define OPCODE_FLDDX OPCODE1(0x0b,0,0x0)
85 #define OPCODE_FSTDX OPCODE1(0x0b,0,0x8)
86 #define OPCODE_FLDDS OPCODE1(0x0b,1,0x0)
87 #define OPCODE_FSTDS OPCODE1(0x0b,1,0x8)
88
89 #define OPCODE_LDD_L OPCODE2(0x14,0)
90 #define OPCODE_FLDD_L OPCODE2(0x14,1)
91 #define OPCODE_STD_L OPCODE2(0x1c,0)
92 #define OPCODE_FSTD_L OPCODE2(0x1c,1)
93
94 #define OPCODE_LDW_M OPCODE3(0x17,1)
95 #define OPCODE_FLDW_L OPCODE3(0x17,0)
96 #define OPCODE_FSTW_L OPCODE3(0x1f,0)
97 #define OPCODE_STW_M OPCODE3(0x1f,1)
98
99 #define OPCODE_LDH_L OPCODE4(0x11)
100 #define OPCODE_LDW_L OPCODE4(0x12)
101 #define OPCODE_LDWM OPCODE4(0x13)
102 #define OPCODE_STH_L OPCODE4(0x19)
103 #define OPCODE_STW_L OPCODE4(0x1A)
104 #define OPCODE_STWM OPCODE4(0x1B)
105
106 #define MAJOR_OP(i) (((i)>>26)&0x3f)
107 #define R1(i) (((i)>>21)&0x1f)
108 #define R2(i) (((i)>>16)&0x1f)
109 #define R3(i) ((i)&0x1f)
110 #define FR3(i) ((((i)<<1)&0x1f)|(((i)>>6)&1))
111 #define IM(i,n) (((i)>>1&((1<<(n-1))-1))|((i)&1?((0-1L)<<(n-1)):0))
112 #define IM5_2(i) IM((i)>>16,5)
113 #define IM5_3(i) IM((i),5)
114 #define IM14(i) IM((i),14)
115
116 #define ERR_NOTHANDLED -1
117 #define ERR_PAGEFAULT -2
118
119 int unaligned_enabled __read_mostly = 1;
120
121 static int emulate_ldh(struct pt_regs *regs, int toreg)
122 {
123 unsigned long saddr = regs->ior;
124 unsigned long val = 0;
125 int ret;
126
127 DPRINTF("load " RFMT ":" RFMT " to r%d for 2 bytes\n",
128 regs->isr, regs->ior, toreg);
129
130 __asm__ __volatile__ (
131 " mtsp %4, %%sr1\n"
132 "1: ldbs 0(%%sr1,%3), %%r20\n"
133 "2: ldbs 1(%%sr1,%3), %0\n"
134 " depw %%r20, 23, 24, %0\n"
135 " copy %%r0, %1\n"
136 "3: \n"
137 " .section .fixup,\"ax\"\n"
138 "4: ldi -2, %1\n"
139 FIXUP_BRANCH(3b)
140 " .previous\n"
141 ASM_EXCEPTIONTABLE_ENTRY(1b, 4b)
142 ASM_EXCEPTIONTABLE_ENTRY(2b, 4b)
143 : "=r" (val), "=r" (ret)
144 : "0" (val), "r" (saddr), "r" (regs->isr)
145 : "r20", FIXUP_BRANCH_CLOBBER );
146
147 DPRINTF("val = 0x" RFMT "\n", val);
148
149 if (toreg)
150 regs->gr[toreg] = val;
151
152 return ret;
153 }
154
155 static int emulate_ldw(struct pt_regs *regs, int toreg, int flop)
156 {
157 unsigned long saddr = regs->ior;
158 unsigned long val = 0;
159 int ret;
160
161 DPRINTF("load " RFMT ":" RFMT " to r%d for 4 bytes\n",
162 regs->isr, regs->ior, toreg);
163
164 __asm__ __volatile__ (
165 " zdep %3,28,2,%%r19\n" /* r19=(ofs&3)*8 */
166 " mtsp %4, %%sr1\n"
167 " depw %%r0,31,2,%3\n"
168 "1: ldw 0(%%sr1,%3),%0\n"
169 "2: ldw 4(%%sr1,%3),%%r20\n"
170 " subi 32,%%r19,%%r19\n"
171 " mtctl %%r19,11\n"
172 " vshd %0,%%r20,%0\n"
173 " copy %%r0, %1\n"
174 "3: \n"
175 " .section .fixup,\"ax\"\n"
176 "4: ldi -2, %1\n"
177 FIXUP_BRANCH(3b)
178 " .previous\n"
179 ASM_EXCEPTIONTABLE_ENTRY(1b, 4b)
180 ASM_EXCEPTIONTABLE_ENTRY(2b, 4b)
181 : "=r" (val), "=r" (ret)
182 : "0" (val), "r" (saddr), "r" (regs->isr)
183 : "r19", "r20", FIXUP_BRANCH_CLOBBER );
184
185 DPRINTF("val = 0x" RFMT "\n", val);
186
187 if (flop)
188 ((__u32*)(regs->fr))[toreg] = val;
189 else if (toreg)
190 regs->gr[toreg] = val;
191
192 return ret;
193 }
194 static int emulate_ldd(struct pt_regs *regs, int toreg, int flop)
195 {
196 unsigned long saddr = regs->ior;
197 __u64 val = 0;
198 int ret;
199
200 DPRINTF("load " RFMT ":" RFMT " to r%d for 8 bytes\n",
201 regs->isr, regs->ior, toreg);
202 #ifdef CONFIG_PA20
203
204 #ifndef CONFIG_64BIT
205 if (!flop)
206 return -1;
207 #endif
208 __asm__ __volatile__ (
209 " depd,z %3,60,3,%%r19\n" /* r19=(ofs&7)*8 */
210 " mtsp %4, %%sr1\n"
211 " depd %%r0,63,3,%3\n"
212 "1: ldd 0(%%sr1,%3),%0\n"
213 "2: ldd 8(%%sr1,%3),%%r20\n"
214 " subi 64,%%r19,%%r19\n"
215 " mtsar %%r19\n"
216 " shrpd %0,%%r20,%%sar,%0\n"
217 " copy %%r0, %1\n"
218 "3: \n"
219 " .section .fixup,\"ax\"\n"
220 "4: ldi -2, %1\n"
221 FIXUP_BRANCH(3b)
222 " .previous\n"
223 ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
224 ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
225 : "=r" (val), "=r" (ret)
226 : "0" (val), "r" (saddr), "r" (regs->isr)
227 : "r19", "r20", FIXUP_BRANCH_CLOBBER );
228 #else
229 {
230 unsigned long valh=0,vall=0;
231 __asm__ __volatile__ (
232 " zdep %5,29,2,%%r19\n" /* r19=(ofs&3)*8 */
233 " mtsp %6, %%sr1\n"
234 " dep %%r0,31,2,%5\n"
235 "1: ldw 0(%%sr1,%5),%0\n"
236 "2: ldw 4(%%sr1,%5),%1\n"
237 "3: ldw 8(%%sr1,%5),%%r20\n"
238 " subi 32,%%r19,%%r19\n"
239 " mtsar %%r19\n"
240 " vshd %0,%1,%0\n"
241 " vshd %1,%%r20,%1\n"
242 " copy %%r0, %2\n"
243 "4: \n"
244 " .section .fixup,\"ax\"\n"
245 "5: ldi -2, %2\n"
246 FIXUP_BRANCH(4b)
247 " .previous\n"
248 ASM_EXCEPTIONTABLE_ENTRY(1b,5b)
249 ASM_EXCEPTIONTABLE_ENTRY(2b,5b)
250 ASM_EXCEPTIONTABLE_ENTRY(3b,5b)
251 : "=r" (valh), "=r" (vall), "=r" (ret)
252 : "0" (valh), "1" (vall), "r" (saddr), "r" (regs->isr)
253 : "r19", "r20", FIXUP_BRANCH_CLOBBER );
254 val=((__u64)valh<<32)|(__u64)vall;
255 }
256 #endif
257
258 DPRINTF("val = 0x%llx\n", val);
259
260 if (flop)
261 regs->fr[toreg] = val;
262 else if (toreg)
263 regs->gr[toreg] = val;
264
265 return ret;
266 }
267
268 static int emulate_sth(struct pt_regs *regs, int frreg)
269 {
270 unsigned long val = regs->gr[frreg];
271 int ret;
272
273 if (!frreg)
274 val = 0;
275
276 DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 2 bytes\n", frreg,
277 val, regs->isr, regs->ior);
278
279 __asm__ __volatile__ (
280 " mtsp %3, %%sr1\n"
281 " extrw,u %1, 23, 8, %%r19\n"
282 "1: stb %1, 1(%%sr1, %2)\n"
283 "2: stb %%r19, 0(%%sr1, %2)\n"
284 " copy %%r0, %0\n"
285 "3: \n"
286 " .section .fixup,\"ax\"\n"
287 "4: ldi -2, %0\n"
288 FIXUP_BRANCH(3b)
289 " .previous\n"
290 ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
291 ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
292 : "=r" (ret)
293 : "r" (val), "r" (regs->ior), "r" (regs->isr)
294 : "r19", FIXUP_BRANCH_CLOBBER );
295
296 return ret;
297 }
298
299 static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
300 {
301 unsigned long val;
302 int ret;
303
304 if (flop)
305 val = ((__u32*)(regs->fr))[frreg];
306 else if (frreg)
307 val = regs->gr[frreg];
308 else
309 val = 0;
310
311 DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg,
312 val, regs->isr, regs->ior);
313
314
315 __asm__ __volatile__ (
316 " mtsp %3, %%sr1\n"
317 " zdep %2, 28, 2, %%r19\n"
318 " dep %%r0, 31, 2, %2\n"
319 " mtsar %%r19\n"
320 " depwi,z -2, %%sar, 32, %%r19\n"
321 "1: ldw 0(%%sr1,%2),%%r20\n"
322 "2: ldw 4(%%sr1,%2),%%r21\n"
323 " vshd %%r0, %1, %%r22\n"
324 " vshd %1, %%r0, %%r1\n"
325 " and %%r20, %%r19, %%r20\n"
326 " andcm %%r21, %%r19, %%r21\n"
327 " or %%r22, %%r20, %%r20\n"
328 " or %%r1, %%r21, %%r21\n"
329 " stw %%r20,0(%%sr1,%2)\n"
330 " stw %%r21,4(%%sr1,%2)\n"
331 " copy %%r0, %0\n"
332 "3: \n"
333 " .section .fixup,\"ax\"\n"
334 "4: ldi -2, %0\n"
335 FIXUP_BRANCH(3b)
336 " .previous\n"
337 ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
338 ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
339 : "=r" (ret)
340 : "r" (val), "r" (regs->ior), "r" (regs->isr)
341 : "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
342
343 return 0;
344 }
345 static int emulate_std(struct pt_regs *regs, int frreg, int flop)
346 {
347 __u64 val;
348 int ret;
349
350 if (flop)
351 val = regs->fr[frreg];
352 else if (frreg)
353 val = regs->gr[frreg];
354 else
355 val = 0;
356
357 DPRINTF("store r%d (0x%016llx) to " RFMT ":" RFMT " for 8 bytes\n", frreg,
358 val, regs->isr, regs->ior);
359
360 #ifdef CONFIG_PA20
361 #ifndef CONFIG_64BIT
362 if (!flop)
363 return -1;
364 #endif
365 __asm__ __volatile__ (
366 " mtsp %3, %%sr1\n"
367 " depd,z %2, 60, 3, %%r19\n"
368 " depd %%r0, 63, 3, %2\n"
369 " mtsar %%r19\n"
370 " depdi,z -2, %%sar, 64, %%r19\n"
371 "1: ldd 0(%%sr1,%2),%%r20\n"
372 "2: ldd 8(%%sr1,%2),%%r21\n"
373 " shrpd %%r0, %1, %%sar, %%r22\n"
374 " shrpd %1, %%r0, %%sar, %%r1\n"
375 " and %%r20, %%r19, %%r20\n"
376 " andcm %%r21, %%r19, %%r21\n"
377 " or %%r22, %%r20, %%r20\n"
378 " or %%r1, %%r21, %%r21\n"
379 "3: std %%r20,0(%%sr1,%2)\n"
380 "4: std %%r21,8(%%sr1,%2)\n"
381 " copy %%r0, %0\n"
382 "5: \n"
383 " .section .fixup,\"ax\"\n"
384 "6: ldi -2, %0\n"
385 FIXUP_BRANCH(5b)
386 " .previous\n"
387 ASM_EXCEPTIONTABLE_ENTRY(1b,6b)
388 ASM_EXCEPTIONTABLE_ENTRY(2b,6b)
389 ASM_EXCEPTIONTABLE_ENTRY(3b,6b)
390 ASM_EXCEPTIONTABLE_ENTRY(4b,6b)
391 : "=r" (ret)
392 : "r" (val), "r" (regs->ior), "r" (regs->isr)
393 : "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
394 #else
395 {
396 unsigned long valh=(val>>32),vall=(val&0xffffffffl);
397 __asm__ __volatile__ (
398 " mtsp %4, %%sr1\n"
399 " zdep %2, 29, 2, %%r19\n"
400 " dep %%r0, 31, 2, %2\n"
401 " mtsar %%r19\n"
402 " zvdepi -2, 32, %%r19\n"
403 "1: ldw 0(%%sr1,%3),%%r20\n"
404 "2: ldw 8(%%sr1,%3),%%r21\n"
405 " vshd %1, %2, %%r1\n"
406 " vshd %%r0, %1, %1\n"
407 " vshd %2, %%r0, %2\n"
408 " and %%r20, %%r19, %%r20\n"
409 " andcm %%r21, %%r19, %%r21\n"
410 " or %1, %%r20, %1\n"
411 " or %2, %%r21, %2\n"
412 "3: stw %1,0(%%sr1,%1)\n"
413 "4: stw %%r1,4(%%sr1,%3)\n"
414 "5: stw %2,8(%%sr1,%3)\n"
415 " copy %%r0, %0\n"
416 "6: \n"
417 " .section .fixup,\"ax\"\n"
418 "7: ldi -2, %0\n"
419 FIXUP_BRANCH(6b)
420 " .previous\n"
421 ASM_EXCEPTIONTABLE_ENTRY(1b,7b)
422 ASM_EXCEPTIONTABLE_ENTRY(2b,7b)
423 ASM_EXCEPTIONTABLE_ENTRY(3b,7b)
424 ASM_EXCEPTIONTABLE_ENTRY(4b,7b)
425 ASM_EXCEPTIONTABLE_ENTRY(5b,7b)
426 : "=r" (ret)
427 : "r" (valh), "r" (vall), "r" (regs->ior), "r" (regs->isr)
428 : "r19", "r20", "r21", "r1", FIXUP_BRANCH_CLOBBER );
429 }
430 #endif
431
432 return ret;
433 }
434
435 void handle_unaligned(struct pt_regs *regs)
436 {
437 static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
438 unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
439 int modify = 0;
440 int ret = ERR_NOTHANDLED;
441 register int flop=0; /* true if this is a flop */
442
443 __inc_irq_stat(irq_unaligned_count);
444
445 /* log a message with pacing */
446 if (user_mode(regs)) {
447 if (current->thread.flags & PARISC_UAC_SIGBUS) {
448 goto force_sigbus;
449 }
450
451 if (!(current->thread.flags & PARISC_UAC_NOPRINT) &&
452 __ratelimit(&ratelimit)) {
453 char buf[256];
454 sprintf(buf, "%s(%d): unaligned access to 0x" RFMT " at ip=0x" RFMT "\n",
455 current->comm, task_pid_nr(current), regs->ior, regs->iaoq[0]);
456 printk(KERN_WARNING "%s", buf);
457 #ifdef DEBUG_UNALIGNED
458 show_regs(regs);
459 #endif
460 }
461
462 if (!unaligned_enabled)
463 goto force_sigbus;
464 }
465
466 /* handle modification - OK, it's ugly, see the instruction manual */
467 switch (MAJOR_OP(regs->iir))
468 {
469 case 0x03:
470 case 0x09:
471 case 0x0b:
472 if (regs->iir&0x20)
473 {
474 modify = 1;
475 if (regs->iir&0x1000) /* short loads */
476 if (regs->iir&0x200)
477 newbase += IM5_3(regs->iir);
478 else
479 newbase += IM5_2(regs->iir);
480 else if (regs->iir&0x2000) /* scaled indexed */
481 {
482 int shift=0;
483 switch (regs->iir & OPCODE1_MASK)
484 {
485 case OPCODE_LDH_I:
486 shift= 1; break;
487 case OPCODE_LDW_I:
488 shift= 2; break;
489 case OPCODE_LDD_I:
490 case OPCODE_LDDA_I:
491 shift= 3; break;
492 }
493 newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0)<<shift;
494 } else /* simple indexed */
495 newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0);
496 }
497 break;
498 case 0x13:
499 case 0x1b:
500 modify = 1;
501 newbase += IM14(regs->iir);
502 break;
503 case 0x14:
504 case 0x1c:
505 if (regs->iir&8)
506 {
507 modify = 1;
508 newbase += IM14(regs->iir&~0xe);
509 }
510 break;
511 case 0x16:
512 case 0x1e:
513 modify = 1;
514 newbase += IM14(regs->iir&6);
515 break;
516 case 0x17:
517 case 0x1f:
518 if (regs->iir&4)
519 {
520 modify = 1;
521 newbase += IM14(regs->iir&~4);
522 }
523 break;
524 }
525
526 /* TODO: make this cleaner... */
527 switch (regs->iir & OPCODE1_MASK)
528 {
529 case OPCODE_LDH_I:
530 case OPCODE_LDH_S:
531 ret = emulate_ldh(regs, R3(regs->iir));
532 break;
533
534 case OPCODE_LDW_I:
535 case OPCODE_LDWA_I:
536 case OPCODE_LDW_S:
537 case OPCODE_LDWA_S:
538 ret = emulate_ldw(regs, R3(regs->iir),0);
539 break;
540
541 case OPCODE_STH:
542 ret = emulate_sth(regs, R2(regs->iir));
543 break;
544
545 case OPCODE_STW:
546 case OPCODE_STWA:
547 ret = emulate_stw(regs, R2(regs->iir),0);
548 break;
549
550 #ifdef CONFIG_PA20
551 case OPCODE_LDD_I:
552 case OPCODE_LDDA_I:
553 case OPCODE_LDD_S:
554 case OPCODE_LDDA_S:
555 ret = emulate_ldd(regs, R3(regs->iir),0);
556 break;
557
558 case OPCODE_STD:
559 case OPCODE_STDA:
560 ret = emulate_std(regs, R2(regs->iir),0);
561 break;
562 #endif
563
564 case OPCODE_FLDWX:
565 case OPCODE_FLDWS:
566 case OPCODE_FLDWXR:
567 case OPCODE_FLDWSR:
568 flop=1;
569 ret = emulate_ldw(regs,FR3(regs->iir),1);
570 break;
571
572 case OPCODE_FLDDX:
573 case OPCODE_FLDDS:
574 flop=1;
575 ret = emulate_ldd(regs,R3(regs->iir),1);
576 break;
577
578 case OPCODE_FSTWX:
579 case OPCODE_FSTWS:
580 case OPCODE_FSTWXR:
581 case OPCODE_FSTWSR:
582 flop=1;
583 ret = emulate_stw(regs,FR3(regs->iir),1);
584 break;
585
586 case OPCODE_FSTDX:
587 case OPCODE_FSTDS:
588 flop=1;
589 ret = emulate_std(regs,R3(regs->iir),1);
590 break;
591
592 case OPCODE_LDCD_I:
593 case OPCODE_LDCW_I:
594 case OPCODE_LDCD_S:
595 case OPCODE_LDCW_S:
596 ret = ERR_NOTHANDLED; /* "undefined", but lets kill them. */
597 break;
598 }
599 #ifdef CONFIG_PA20
600 switch (regs->iir & OPCODE2_MASK)
601 {
602 case OPCODE_FLDD_L:
603 flop=1;
604 ret = emulate_ldd(regs,R2(regs->iir),1);
605 break;
606 case OPCODE_FSTD_L:
607 flop=1;
608 ret = emulate_std(regs, R2(regs->iir),1);
609 break;
610 case OPCODE_LDD_L:
611 ret = emulate_ldd(regs, R2(regs->iir),0);
612 break;
613 case OPCODE_STD_L:
614 ret = emulate_std(regs, R2(regs->iir),0);
615 break;
616 }
617 #endif
618 switch (regs->iir & OPCODE3_MASK)
619 {
620 case OPCODE_FLDW_L:
621 flop=1;
622 ret = emulate_ldw(regs, R2(regs->iir),0);
623 break;
624 case OPCODE_LDW_M:
625 ret = emulate_ldw(regs, R2(regs->iir),1);
626 break;
627
628 case OPCODE_FSTW_L:
629 flop=1;
630 ret = emulate_stw(regs, R2(regs->iir),1);
631 break;
632 case OPCODE_STW_M:
633 ret = emulate_stw(regs, R2(regs->iir),0);
634 break;
635 }
636 switch (regs->iir & OPCODE4_MASK)
637 {
638 case OPCODE_LDH_L:
639 ret = emulate_ldh(regs, R2(regs->iir));
640 break;
641 case OPCODE_LDW_L:
642 case OPCODE_LDWM:
643 ret = emulate_ldw(regs, R2(regs->iir),0);
644 break;
645 case OPCODE_STH_L:
646 ret = emulate_sth(regs, R2(regs->iir));
647 break;
648 case OPCODE_STW_L:
649 case OPCODE_STWM:
650 ret = emulate_stw(regs, R2(regs->iir),0);
651 break;
652 }
653
654 if (ret == 0 && modify && R1(regs->iir))
655 regs->gr[R1(regs->iir)] = newbase;
656
657
658 if (ret == ERR_NOTHANDLED)
659 printk(KERN_CRIT "Not-handled unaligned insn 0x%08lx\n", regs->iir);
660
661 DPRINTF("ret = %d\n", ret);
662
663 if (ret)
664 {
665 /*
666 * The unaligned handler failed.
667 * If we were called by __get_user() or __put_user() jump
668 * to it's exception fixup handler instead of crashing.
669 */
670 if (!user_mode(regs) && fixup_exception(regs))
671 return;
672
673 printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret);
674 die_if_kernel("Unaligned data reference", regs, 28);
675
676 if (ret == ERR_PAGEFAULT)
677 {
678 force_sig_fault(SIGSEGV, SEGV_MAPERR,
679 (void __user *)regs->ior);
680 }
681 else
682 {
683 force_sigbus:
684 /* couldn't handle it ... */
685 force_sig_fault(SIGBUS, BUS_ADRALN,
686 (void __user *)regs->ior);
687 }
688
689 return;
690 }
691
692 /* else we handled it, let life go on. */
693 regs->gr[0]|=PSW_N;
694 }
695
696 /*
697 * NB: check_unaligned() is only used for PCXS processors right
698 * now, so we only check for PA1.1 encodings at this point.
699 */
700
701 int
702 check_unaligned(struct pt_regs *regs)
703 {
704 unsigned long align_mask;
705
706 /* Get alignment mask */
707
708 align_mask = 0UL;
709 switch (regs->iir & OPCODE1_MASK) {
710
711 case OPCODE_LDH_I:
712 case OPCODE_LDH_S:
713 case OPCODE_STH:
714 align_mask = 1UL;
715 break;
716
717 case OPCODE_LDW_I:
718 case OPCODE_LDWA_I:
719 case OPCODE_LDW_S:
720 case OPCODE_LDWA_S:
721 case OPCODE_STW:
722 case OPCODE_STWA:
723 align_mask = 3UL;
724 break;
725
726 default:
727 switch (regs->iir & OPCODE4_MASK) {
728 case OPCODE_LDH_L:
729 case OPCODE_STH_L:
730 align_mask = 1UL;
731 break;
732 case OPCODE_LDW_L:
733 case OPCODE_LDWM:
734 case OPCODE_STW_L:
735 case OPCODE_STWM:
736 align_mask = 3UL;
737 break;
738 }
739 break;
740 }
741
742 return (int)(regs->ior & align_mask);
743 }
744
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