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