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/kernel.h>
  24 #include <linux/module.h>
  25 #include <asm/uaccess.h>
  26
  27 /* #define DEBUG_UNALIGNED 1 */
  28
  29 #ifdef DEBUG_UNALIGNED
  30 #define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __FUNCTION__ ); printk(KERN_DEBUG fmt, ##args ); } while (0)
  31 #else
  32 #define DPRINTF(fmt, args...)
  33 #endif
  34
  35 #ifdef __LP64__
  36 #define RFMT "%016lx"
  37 #else
  38 #define RFMT "%08lx"
  39 #endif
  40
  41 #define FIXUP_BRANCH(lbl) \
  42         "\tldil L%%" #lbl ", %%r1\n"                    \
  43         "\tldo R%%" #lbl "(%%r1), %%r1\n"               \
  44         "\tbv,n %%r0(%%r1)\n"
  45 /* If you use FIXUP_BRANCH, then you must list this clobber */
  46 #define FIXUP_BRANCH_CLOBBER "r1"
  47
  48 /* 1111 1100 0000 0000 0001 0011 1100 0000 */
  49 #define OPCODE1(a,b,c)  ((a)<<26|(b)<<12|(c)<<6)
  50 #define OPCODE2(a,b)    ((a)<<26|(b)<<1)
  51 #define OPCODE3(a,b)    ((a)<<26|(b)<<2)
  52 #define OPCODE4(a)      ((a)<<26)
  53 #define OPCODE1_MASK    OPCODE1(0x3f,1,0xf)
  54 #define OPCODE2_MASK    OPCODE2(0x3f,1)
  55 #define OPCODE3_MASK    OPCODE3(0x3f,1)
  56 #define OPCODE4_MASK    OPCODE4(0x3f)
  57
  58 /* skip LDB - never unaligned (index) */
  59 #define OPCODE_LDH_I    OPCODE1(0x03,0,0x1)
  60 #define OPCODE_LDW_I    OPCODE1(0x03,0,0x2)
  61 #define OPCODE_LDD_I    OPCODE1(0x03,0,0x3)
  62 #define OPCODE_LDDA_I   OPCODE1(0x03,0,0x4)
  63 #define OPCODE_LDCD_I   OPCODE1(0x03,0,0x5)
  64 #define OPCODE_LDWA_I   OPCODE1(0x03,0,0x6)
  65 #define OPCODE_LDCW_I   OPCODE1(0x03,0,0x7)
  66 /* skip LDB - never unaligned (short) */
  67 #define OPCODE_LDH_S    OPCODE1(0x03,1,0x1)
  68 #define OPCODE_LDW_S    OPCODE1(0x03,1,0x2)
  69 #define OPCODE_LDD_S    OPCODE1(0x03,1,0x3)
  70 #define OPCODE_LDDA_S   OPCODE1(0x03,1,0x4)
  71 #define OPCODE_LDCD_S   OPCODE1(0x03,1,0x5)
  72 #define OPCODE_LDWA_S   OPCODE1(0x03,1,0x6)
  73 #define OPCODE_LDCW_S   OPCODE1(0x03,1,0x7)
  74 /* skip STB - never unaligned */
  75 #define OPCODE_STH      OPCODE1(0x03,1,0x9)
  76 #define OPCODE_STW      OPCODE1(0x03,1,0xa)
  77 #define OPCODE_STD      OPCODE1(0x03,1,0xb)
  78 /* skip STBY - never unaligned */
  79 /* skip STDBY - never unaligned */
  80 #define OPCODE_STWA     OPCODE1(0x03,1,0xe)
  81 #define OPCODE_STDA     OPCODE1(0x03,1,0xf)
  82
  83 #define OPCODE_FLDWX    OPCODE1(0x09,0,0x0)
  84 #define OPCODE_FLDWXR   OPCODE1(0x09,0,0x1)
  85 #define OPCODE_FSTWX    OPCODE1(0x09,0,0x8)
  86 #define OPCODE_FSTWXR   OPCODE1(0x09,0,0x9)
  87 #define OPCODE_FLDWS    OPCODE1(0x09,1,0x0)
  88 #define OPCODE_FLDWSR   OPCODE1(0x09,1,0x1)
  89 #define OPCODE_FSTWS    OPCODE1(0x09,1,0x8)
  90 #define OPCODE_FSTWSR   OPCODE1(0x09,1,0x9)
  91 #define OPCODE_FLDDX    OPCODE1(0x0b,0,0x0)
  92 #define OPCODE_FSTDX    OPCODE1(0x0b,0,0x8)
  93 #define OPCODE_FLDDS    OPCODE1(0x0b,1,0x0)
  94 #define OPCODE_FSTDS    OPCODE1(0x0b,1,0x8)
  95
  96 #define OPCODE_LDD_L    OPCODE2(0x14,0)
  97 #define OPCODE_FLDD_L   OPCODE2(0x14,1)
  98 #define OPCODE_STD_L    OPCODE2(0x1c,0)
  99 #define OPCODE_FSTD_L   OPCODE2(0x1c,1)
 100
 101 #define OPCODE_LDW_M    OPCODE3(0x17,1)
 102 #define OPCODE_FLDW_L   OPCODE3(0x17,0)
 103 #define OPCODE_FSTW_L   OPCODE3(0x1f,0)
 104 #define OPCODE_STW_M    OPCODE3(0x1f,1)
 105
 106 #define OPCODE_LDH_L    OPCODE4(0x11)
 107 #define OPCODE_LDW_L    OPCODE4(0x12)
 108 #define OPCODE_LDWM     OPCODE4(0x13)
 109 #define OPCODE_STH_L    OPCODE4(0x19)
 110 #define OPCODE_STW_L    OPCODE4(0x1A)
 111 #define OPCODE_STWM     OPCODE4(0x1B)
 112
 113 #define MAJOR_OP(i) (((i)>>26)&0x3f)
 114 #define R1(i) (((i)>>21)&0x1f)
 115 #define R2(i) (((i)>>16)&0x1f)
 116 #define R3(i) ((i)&0x1f)
 117 #define FR3(i) ((((i)<<1)&0x1f)|(((i)>>6)&1))
 118 #define IM(i,n) (((i)>>1&((1<<(n-1))-1))|((i)&1?((0-1L)<<(n-1)):0))
 119 #define IM5_2(i) IM((i)>>16,5)
 120 #define IM5_3(i) IM((i),5)
 121 #define IM14(i) IM((i),14)
 122
 123 #define ERR_NOTHANDLED  -1
 124 #define ERR_PAGEFAULT   -2
 125
 126 int unaligned_enabled __read_mostly = 1;
 127
 128 void die_if_kernel (char *str, struct pt_regs *regs, long err);
 129
 130 static int emulate_ldh(struct pt_regs *regs, int toreg)
 131 {
 132         unsigned long saddr = regs->ior;
 133         unsigned long val = 0;
 134         int ret;
 135
 136         DPRINTF("load " RFMT ":" RFMT " to r%d for 2 bytes\n",
 137                 regs->isr, regs->ior, toreg);
 138
 139         __asm__ __volatile__  (
 140 "       mtsp    %4, %%sr1\n"
 141 "1:     ldbs    0(%%sr1,%3), %%r20\n"
 142 "2:     ldbs    1(%%sr1,%3), %0\n"
 143 "       depw    %%r20, 23, 24, %0\n"
 144 "       copy    %%r0, %1\n"
 145 "3:     \n"
 146 "       .section .fixup,\"ax\"\n"
 147 "4:     ldi     -2, %1\n"
 148         FIXUP_BRANCH(3b)
 149 "       .previous\n"
 150 "       .section __ex_table,\"aw\"\n"
 151 #ifdef __LP64__
 152 "       .dword  1b,4b\n"
 153 "       .dword  2b,4b\n"
 154 #else
 155 "       .word   1b,4b\n"
 156 "       .word   2b,4b\n"
 157 #endif
 158 "       .previous\n"
 159         : "=r" (val), "=r" (ret)
 160         : "0" (val), "r" (saddr), "r" (regs->isr)
 161         : "r20", FIXUP_BRANCH_CLOBBER );
 162
 163         DPRINTF("val = 0x" RFMT "\n", val);
 164
 165         if (toreg)
 166                 regs->gr[toreg] = val;
 167
 168         return ret;
 169 }
 170
 171 static int emulate_ldw(struct pt_regs *regs, int toreg, int flop)
 172 {
 173         unsigned long saddr = regs->ior;
 174         unsigned long val = 0;
 175         int ret;
 176
 177         DPRINTF("load " RFMT ":" RFMT " to r%d for 4 bytes\n",
 178                 regs->isr, regs->ior, toreg);
 179
 180         __asm__ __volatile__  (
 181 "       zdep    %3,28,2,%%r19\n"                /* r19=(ofs&3)*8 */
 182 "       mtsp    %4, %%sr1\n"
 183 "       depw    %%r0,31,2,%3\n"
 184 "1:     ldw     0(%%sr1,%3),%0\n"
 185 "2:     ldw     4(%%sr1,%3),%%r20\n"
 186 "       subi    32,%%r19,%%r19\n"
 187 "       mtctl   %%r19,11\n"
 188 "       vshd    %0,%%r20,%0\n"
 189 "       copy    %%r0, %1\n"
 190 "3:     \n"
 191 "       .section .fixup,\"ax\"\n"
 192 "4:     ldi     -2, %1\n"
 193         FIXUP_BRANCH(3b)
 194 "       .previous\n"
 195 "       .section __ex_table,\"aw\"\n"
 196 #ifdef __LP64__
 197 "       .dword  1b,4b\n"
 198 "       .dword  2b,4b\n"
 199 #else
 200 "       .word   1b,4b\n"
 201 "       .word   2b,4b\n"
 202 #endif
 203 "       .previous\n"
 204         : "=r" (val), "=r" (ret)
 205         : "0" (val), "r" (saddr), "r" (regs->isr)
 206         : "r19", "r20", FIXUP_BRANCH_CLOBBER );
 207
 208         DPRINTF("val = 0x" RFMT "\n", val);
 209
 210         if (flop)
 211                 ((__u32*)(regs->fr))[toreg] = val;
 212         else if (toreg)
 213                 regs->gr[toreg] = val;
 214
 215         return ret;
 216 }
 217 static int emulate_ldd(struct pt_regs *regs, int toreg, int flop)
 218 {
 219         unsigned long saddr = regs->ior;
 220         __u64 val = 0;
 221         int ret;
 222
 223         DPRINTF("load " RFMT ":" RFMT " to r%d for 8 bytes\n",
 224                 regs->isr, regs->ior, toreg);
 225 #ifdef CONFIG_PA20
 226
 227 #ifndef __LP64__
 228         if (!flop)
 229                 return -1;
 230 #endif
 231         __asm__ __volatile__  (
 232 "       depd,z  %3,60,3,%%r19\n"                /* r19=(ofs&7)*8 */
 233 "       mtsp    %4, %%sr1\n"
 234 "       depd    %%r0,63,3,%3\n"
 235 "1:     ldd     0(%%sr1,%3),%0\n"
 236 "2:     ldd     8(%%sr1,%3),%%r20\n"
 237 "       subi    64,%%r19,%%r19\n"
 238 "       mtsar   %%r19\n"
 239 "       shrpd   %0,%%r20,%%sar,%0\n"
 240 "       copy    %%r0, %1\n"
 241 "3:     \n"
 242 "       .section .fixup,\"ax\"\n"
 243 "4:     ldi     -2, %1\n"
 244         FIXUP_BRANCH(3b)
 245 "       .previous\n"
 246 "       .section __ex_table,\"aw\"\n"
 247 #ifdef __LP64__
 248 "       .dword  1b,4b\n"
 249 "       .dword  2b,4b\n"
 250 #else
 251 "       .word   1b,4b\n"
 252 "       .word   2b,4b\n"
 253 #endif
 254 "       .previous\n"
 255         : "=r" (val), "=r" (ret)
 256         : "0" (val), "r" (saddr), "r" (regs->isr)
 257         : "r19", "r20", FIXUP_BRANCH_CLOBBER );
 258 #else
 259     {
 260         unsigned long valh=0,vall=0;
 261         __asm__ __volatile__  (
 262 "       zdep    %5,29,2,%%r19\n"                /* r19=(ofs&3)*8 */
 263 "       mtsp    %6, %%sr1\n"
 264 "       dep     %%r0,31,2,%5\n"
 265 "1:     ldw     0(%%sr1,%5),%0\n"
 266 "2:     ldw     4(%%sr1,%5),%1\n"
 267 "3:     ldw     8(%%sr1,%5),%%r20\n"
 268 "       subi    32,%%r19,%%r19\n"
 269 "       mtsar   %%r19\n"
 270 "       vshd    %0,%1,%0\n"
 271 "       vshd    %1,%%r20,%1\n"
 272 "       copy    %%r0, %2\n"
 273 "4:     \n"
 274 "       .section .fixup,\"ax\"\n"
 275 "5:     ldi     -2, %2\n"
 276         FIXUP_BRANCH(4b)
 277 "       .previous\n"
 278 "       .section __ex_table,\"aw\"\n"
 279 #ifdef __LP64__
 280 "       .dword  1b,5b\n"
 281 "       .dword  2b,5b\n"
 282 "       .dword  3b,5b\n"
 283 #else
 284 "       .word   1b,5b\n"
 285 "       .word   2b,5b\n"
 286 "       .word   3b,5b\n"
 287 #endif
 288 "       .previous\n"
 289         : "=r" (valh), "=r" (vall), "=r" (ret)
 290         : "0" (valh), "1" (vall), "r" (saddr), "r" (regs->isr)
 291         : "r19", "r20", FIXUP_BRANCH_CLOBBER );
 292         val=((__u64)valh<<32)|(__u64)vall;
 293     }
 294 #endif
 295
 296         DPRINTF("val = 0x%llx\n", val);
 297
 298         if (flop)
 299                 regs->fr[toreg] = val;
 300         else if (toreg)
 301                 regs->gr[toreg] = val;
 302
 303         return ret;
 304 }
 305
 306 static int emulate_sth(struct pt_regs *regs, int frreg)
 307 {
 308         unsigned long val = regs->gr[frreg];
 309         int ret;
 310
 311         if (!frreg)
 312                 val = 0;
 313
 314         DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 2 bytes\n", frreg,
 315                 val, regs->isr, regs->ior);
 316
 317         __asm__ __volatile__ (
 318 "       mtsp %3, %%sr1\n"
 319 "       extrw,u %1, 23, 8, %%r19\n"
 320 "1:     stb %1, 1(%%sr1, %2)\n"
 321 "2:     stb %%r19, 0(%%sr1, %2)\n"
 322 "       copy    %%r0, %0\n"
 323 "3:     \n"
 324 "       .section .fixup,\"ax\"\n"
 325 "4:     ldi     -2, %0\n"
 326         FIXUP_BRANCH(3b)
 327 "       .previous\n"
 328 "       .section __ex_table,\"aw\"\n"
 329 #ifdef __LP64__
 330 "       .dword  1b,4b\n"
 331 "       .dword  2b,4b\n"
 332 #else
 333 "       .word   1b,4b\n"
 334 "       .word   2b,4b\n"
 335 #endif
 336 "       .previous\n"
 337         : "=r" (ret)
 338         : "r" (val), "r" (regs->ior), "r" (regs->isr)
 339         : "r19", FIXUP_BRANCH_CLOBBER );
 340
 341         return ret;
 342 }
 343
 344 static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
 345 {
 346         unsigned long val;
 347         int ret;
 348
 349         if (flop)
 350                 val = ((__u32*)(regs->fr))[frreg];
 351         else if (frreg)
 352                 val = regs->gr[frreg];
 353         else
 354                 val = 0;
 355
 356         DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg,
 357                 val, regs->isr, regs->ior);
 358
 359
 360         __asm__ __volatile__ (
 361 "       mtsp %3, %%sr1\n"
 362 "       zdep    %2, 28, 2, %%r19\n"
 363 "       dep     %%r0, 31, 2, %2\n"
 364 "       mtsar   %%r19\n"
 365 "       depwi,z -2, %%sar, 32, %%r19\n"
 366 "1:     ldw     0(%%sr1,%2),%%r20\n"
 367 "2:     ldw     4(%%sr1,%2),%%r21\n"
 368 "       vshd    %%r0, %1, %%r22\n"
 369 "       vshd    %1, %%r0, %%r1\n"
 370 "       and     %%r20, %%r19, %%r20\n"
 371 "       andcm   %%r21, %%r19, %%r21\n"
 372 "       or      %%r22, %%r20, %%r20\n"
 373 "       or      %%r1, %%r21, %%r21\n"
 374 "       stw     %%r20,0(%%sr1,%2)\n"
 375 "       stw     %%r21,4(%%sr1,%2)\n"
 376 "       copy    %%r0, %0\n"
 377 "3:     \n"
 378 "       .section .fixup,\"ax\"\n"
 379 "4:     ldi     -2, %0\n"
 380         FIXUP_BRANCH(3b)
 381 "       .previous\n"
 382 "       .section __ex_table,\"aw\"\n"
 383 #ifdef __LP64__
 384 "       .dword  1b,4b\n"
 385 "       .dword  2b,4b\n"
 386 #else
 387 "       .word   1b,4b\n"
 388 "       .word   2b,4b\n"
 389 #endif
 390 "       .previous\n"
 391         : "=r" (ret)
 392         : "r" (val), "r" (regs->ior), "r" (regs->isr)
 393         : "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
 394
 395         return 0;
 396 }
 397 static int emulate_std(struct pt_regs *regs, int frreg, int flop)
 398 {
 399         __u64 val;
 400         int ret;
 401
 402         if (flop)
 403                 val = regs->fr[frreg];
 404         else if (frreg)
 405                 val = regs->gr[frreg];
 406         else
 407                 val = 0;
 408
 409         DPRINTF("store r%d (0x%016llx) to " RFMT ":" RFMT " for 8 bytes\n", frreg,
 410                 val,  regs->isr, regs->ior);
 411
 412 #ifdef CONFIG_PA20
 413 #ifndef __LP64__
 414         if (!flop)
 415                 return -1;
 416 #endif
 417         __asm__ __volatile__ (
 418 "       mtsp %3, %%sr1\n"
 419 "       depd,z  %2, 60, 3, %%r19\n"
 420 "       depd    %%r0, 63, 3, %2\n"
 421 "       mtsar   %%r19\n"
 422 "       depdi,z -2, %%sar, 64, %%r19\n"
 423 "1:     ldd     0(%%sr1,%2),%%r20\n"
 424 "2:     ldd     8(%%sr1,%2),%%r21\n"
 425 "       shrpd   %%r0, %1, %%sar, %%r22\n"
 426 "       shrpd   %1, %%r0, %%sar, %%r1\n"
 427 "       and     %%r20, %%r19, %%r20\n"
 428 "       andcm   %%r21, %%r19, %%r21\n"
 429 "       or      %%r22, %%r20, %%r20\n"
 430 "       or      %%r1, %%r21, %%r21\n"
 431 "3:     std     %%r20,0(%%sr1,%2)\n"
 432 "4:     std     %%r21,8(%%sr1,%2)\n"
 433 "       copy    %%r0, %0\n"
 434 "5:     \n"
 435 "       .section .fixup,\"ax\"\n"
 436 "6:     ldi     -2, %0\n"
 437         FIXUP_BRANCH(5b)
 438 "       .previous\n"
 439 "       .section __ex_table,\"aw\"\n"
 440 #ifdef __LP64__
 441 "       .dword  1b,6b\n"
 442 "       .dword  2b,6b\n"
 443 "       .dword  3b,6b\n"
 444 "       .dword  4b,6b\n"
 445 #else
 446 "       .word   1b,6b\n"
 447 "       .word   2b,6b\n"
 448 "       .word   3b,6b\n"
 449 "       .word   4b,6b\n"
 450 #endif
 451 "       .previous\n"
 452         : "=r" (ret)
 453         : "r" (val), "r" (regs->ior), "r" (regs->isr)
 454         : "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
 455 #else
 456     {
 457         unsigned long valh=(val>>32),vall=(val&0xffffffffl);
 458         __asm__ __volatile__ (
 459 "       mtsp    %4, %%sr1\n"
 460 "       zdep    %2, 29, 2, %%r19\n"
 461 "       dep     %%r0, 31, 2, %2\n"
 462 "       mtsar   %%r19\n"
 463 "       zvdepi  -2, 32, %%r19\n"
 464 "1:     ldw     0(%%sr1,%3),%%r20\n"
 465 "2:     ldw     8(%%sr1,%3),%%r21\n"
 466 "       vshd    %1, %2, %%r1\n"
 467 "       vshd    %%r0, %1, %1\n"
 468 "       vshd    %2, %%r0, %2\n"
 469 "       and     %%r20, %%r19, %%r20\n"
 470 "       andcm   %%r21, %%r19, %%r21\n"
 471 "       or      %1, %%r20, %1\n"
 472 "       or      %2, %%r21, %2\n"
 473 "3:     stw     %1,0(%%sr1,%1)\n"
 474 "4:     stw     %%r1,4(%%sr1,%3)\n"
 475 "5:     stw     %2,8(%%sr1,%3)\n"
 476 "       copy    %%r0, %0\n"
 477 "6:     \n"
 478 "       .section .fixup,\"ax\"\n"
 479 "7:     ldi     -2, %0\n"
 480         FIXUP_BRANCH(6b)
 481 "       .previous\n"
 482 "       .section __ex_table,\"aw\"\n"
 483 #ifdef __LP64__
 484 "       .dword  1b,7b\n"
 485 "       .dword  2b,7b\n"
 486 "       .dword  3b,7b\n"
 487 "       .dword  4b,7b\n"
 488 "       .dword  5b,7b\n"
 489 #else
 490 "       .word   1b,7b\n"
 491 "       .word   2b,7b\n"
 492 "       .word   3b,7b\n"
 493 "       .word   4b,7b\n"
 494 "       .word   5b,7b\n"
 495 #endif
 496 "       .previous\n"
 497         : "=r" (ret)
 498         : "r" (valh), "r" (vall), "r" (regs->ior), "r" (regs->isr)
 499         : "r19", "r20", "r21", "r1", FIXUP_BRANCH_CLOBBER );
 500     }
 501 #endif
 502
 503         return ret;
 504 }
 505
 506 void handle_unaligned(struct pt_regs *regs)
 507 {
 508         static unsigned long unaligned_count = 0;
 509         static unsigned long last_time = 0;
 510         unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
 511         int modify = 0;
 512         int ret = ERR_NOTHANDLED;
 513         struct siginfo si;
 514         register int flop=0;    /* true if this is a flop */
 515
 516         /* log a message with pacing */
 517         if (user_mode(regs)) {
 518                 if (current->thread.flags & PARISC_UAC_SIGBUS) {
 519                         goto force_sigbus;
 520                 }
 521
 522                 if (unaligned_count > 5 && jiffies - last_time > 5*HZ) {
 523                         unaligned_count = 0;
 524                         last_time = jiffies;
 525                 }
 526
 527                 if (!(current->thread.flags & PARISC_UAC_NOPRINT)
 528                     && ++unaligned_count < 5) {
 529                         char buf[256];
 530                         sprintf(buf, "%s(%d): unaligned access to 0x" RFMT " at ip=0x" RFMT "\n",
 531                                 current->comm, current->pid, regs->ior, regs->iaoq[0]);
 532                         printk(KERN_WARNING "%s", buf);
 533 #ifdef DEBUG_UNALIGNED
 534                         show_regs(regs);
 535 #endif
 536                 }
 537
 538                 if (!unaligned_enabled)
 539                         goto force_sigbus;
 540         }
 541
 542         /* handle modification - OK, it's ugly, see the instruction manual */
 543         switch (MAJOR_OP(regs->iir))
 544         {
 545         case 0x03:
 546         case 0x09:
 547         case 0x0b:
 548                 if (regs->iir&0x20)
 549                 {
 550                         modify = 1;
 551                         if (regs->iir&0x1000)           /* short loads */
 552                                 if (regs->iir&0x200)
 553                                         newbase += IM5_3(regs->iir);
 554                                 else
 555                                         newbase += IM5_2(regs->iir);
 556                         else if (regs->iir&0x2000)      /* scaled indexed */
 557                         {
 558                                 int shift=0;
 559                                 switch (regs->iir & OPCODE1_MASK)
 560                                 {
 561                                 case OPCODE_LDH_I:
 562                                         shift= 1; break;
 563                                 case OPCODE_LDW_I:
 564                                         shift= 2; break;
 565                                 case OPCODE_LDD_I:
 566                                 case OPCODE_LDDA_I:
 567                                         shift= 3; break;
 568                                 }
 569                                 newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0)<<shift;
 570                         } else                          /* simple indexed */
 571                                 newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0);
 572                 }
 573                 break;
 574         case 0x13:
 575         case 0x1b:
 576                 modify = 1;
 577                 newbase += IM14(regs->iir);
 578                 break;
 579         case 0x14:
 580         case 0x1c:
 581                 if (regs->iir&8)
 582                 {
 583                         modify = 1;
 584                         newbase += IM14(regs->iir&~0xe);
 585                 }
 586                 break;
 587         case 0x16:
 588         case 0x1e:
 589                 modify = 1;
 590                 newbase += IM14(regs->iir&6);
 591                 break;
 592         case 0x17:
 593         case 0x1f:
 594                 if (regs->iir&4)
 595                 {
 596                         modify = 1;
 597                         newbase += IM14(regs->iir&~4);
 598                 }
 599                 break;
 600         }
 601
 602         /* TODO: make this cleaner... */
 603         switch (regs->iir & OPCODE1_MASK)
 604         {
 605         case OPCODE_LDH_I:
 606         case OPCODE_LDH_S:
 607                 ret = emulate_ldh(regs, R3(regs->iir));
 608                 break;
 609
 610         case OPCODE_LDW_I:
 611         case OPCODE_LDWA_I:
 612         case OPCODE_LDW_S:
 613         case OPCODE_LDWA_S:
 614                 ret = emulate_ldw(regs, R3(regs->iir),0);
 615                 break;
 616
 617         case OPCODE_STH:
 618                 ret = emulate_sth(regs, R2(regs->iir));
 619                 break;
 620
 621         case OPCODE_STW:
 622         case OPCODE_STWA:
 623                 ret = emulate_stw(regs, R2(regs->iir),0);
 624                 break;
 625
 626 #ifdef CONFIG_PA20
 627         case OPCODE_LDD_I:
 628         case OPCODE_LDDA_I:
 629         case OPCODE_LDD_S:
 630         case OPCODE_LDDA_S:
 631                 ret = emulate_ldd(regs, R3(regs->iir),0);
 632                 break;
 633
 634         case OPCODE_STD:
 635         case OPCODE_STDA:
 636                 ret = emulate_std(regs, R2(regs->iir),0);
 637                 break;
 638 #endif
 639
 640         case OPCODE_FLDWX:
 641         case OPCODE_FLDWS:
 642         case OPCODE_FLDWXR:
 643         case OPCODE_FLDWSR:
 644                 flop=1;
 645                 ret = emulate_ldw(regs,FR3(regs->iir),1);
 646                 break;
 647
 648         case OPCODE_FLDDX:
 649         case OPCODE_FLDDS:
 650                 flop=1;
 651                 ret = emulate_ldd(regs,R3(regs->iir),1);
 652                 break;
 653
 654         case OPCODE_FSTWX:
 655         case OPCODE_FSTWS:
 656         case OPCODE_FSTWXR:
 657         case OPCODE_FSTWSR:
 658                 flop=1;
 659                 ret = emulate_stw(regs,FR3(regs->iir),1);
 660                 break;
 661
 662         case OPCODE_FSTDX:
 663         case OPCODE_FSTDS:
 664                 flop=1;
 665                 ret = emulate_std(regs,R3(regs->iir),1);
 666                 break;
 667
 668         case OPCODE_LDCD_I:
 669         case OPCODE_LDCW_I:
 670         case OPCODE_LDCD_S:
 671         case OPCODE_LDCW_S:
 672                 ret = ERR_NOTHANDLED;   /* "undefined", but lets kill them. */
 673                 break;
 674         }
 675 #ifdef CONFIG_PA20
 676         switch (regs->iir & OPCODE2_MASK)
 677         {
 678         case OPCODE_FLDD_L:
 679                 flop=1;
 680                 ret = emulate_ldd(regs,R2(regs->iir),1);
 681                 break;
 682         case OPCODE_FSTD_L:
 683                 flop=1;
 684                 ret = emulate_std(regs, R2(regs->iir),1);
 685                 break;
 686
 687 #ifdef CONFIG_PA20
 688         case OPCODE_LDD_L:
 689                 ret = emulate_ldd(regs, R2(regs->iir),0);
 690                 break;
 691         case OPCODE_STD_L:
 692                 ret = emulate_std(regs, R2(regs->iir),0);
 693                 break;
 694 #endif
 695         }
 696 #endif
 697         switch (regs->iir & OPCODE3_MASK)
 698         {
 699         case OPCODE_FLDW_L:
 700                 flop=1;
 701                 ret = emulate_ldw(regs, R2(regs->iir),0);
 702                 break;
 703         case OPCODE_LDW_M:
 704                 ret = emulate_ldw(regs, R2(regs->iir),1);
 705                 break;
 706
 707         case OPCODE_FSTW_L:
 708                 flop=1;
 709                 ret = emulate_stw(regs, R2(regs->iir),1);
 710                 break;
 711         case OPCODE_STW_M:
 712                 ret = emulate_stw(regs, R2(regs->iir),0);
 713                 break;
 714         }
 715         switch (regs->iir & OPCODE4_MASK)
 716         {
 717         case OPCODE_LDH_L:
 718                 ret = emulate_ldh(regs, R2(regs->iir));
 719                 break;
 720         case OPCODE_LDW_L:
 721         case OPCODE_LDWM:
 722                 ret = emulate_ldw(regs, R2(regs->iir),0);
 723                 break;
 724         case OPCODE_STH_L:
 725                 ret = emulate_sth(regs, R2(regs->iir));
 726                 break;
 727         case OPCODE_STW_L:
 728         case OPCODE_STWM:
 729                 ret = emulate_stw(regs, R2(regs->iir),0);
 730                 break;
 731         }
 732
 733         if (modify && R1(regs->iir))
 734                 regs->gr[R1(regs->iir)] = newbase;
 735
 736
 737         if (ret == ERR_NOTHANDLED)
 738                 printk(KERN_CRIT "Not-handled unaligned insn 0x%08lx\n", regs->iir);
 739
 740         DPRINTF("ret = %d\n", ret);
 741
 742         if (ret)
 743         {
 744                 printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret);
 745                 die_if_kernel("Unaligned data reference", regs, 28);
 746
 747                 if (ret == ERR_PAGEFAULT)
 748                 {
 749                         si.si_signo = SIGSEGV;
 750                         si.si_errno = 0;
 751                         si.si_code = SEGV_MAPERR;
 752                         si.si_addr = (void __user *)regs->ior;
 753                         force_sig_info(SIGSEGV, &si, current);
 754                 }
 755                 else
 756                 {
 757 force_sigbus:
 758                         /* couldn't handle it ... */
 759                         si.si_signo = SIGBUS;
 760                         si.si_errno = 0;
 761                         si.si_code = BUS_ADRALN;
 762                         si.si_addr = (void __user *)regs->ior;
 763                         force_sig_info(SIGBUS, &si, current);
 764                 }
 765
 766                 return;
 767         }
 768
 769         /* else we handled it, let life go on. */
 770         regs->gr[0]|=PSW_N;
 771 }
 772
 773 /*
 774  * NB: check_unaligned() is only used for PCXS processors right
 775  * now, so we only check for PA1.1 encodings at this point.
 776  */
 777
 778 int
 779 check_unaligned(struct pt_regs *regs)
 780 {
 781         unsigned long align_mask;
 782
 783         /* Get alignment mask */
 784
 785         align_mask = 0UL;
 786         switch (regs->iir & OPCODE1_MASK) {
 787
 788         case OPCODE_LDH_I:
 789         case OPCODE_LDH_S:
 790         case OPCODE_STH:
 791                 align_mask = 1UL;
 792                 break;
 793
 794         case OPCODE_LDW_I:
 795         case OPCODE_LDWA_I:
 796         case OPCODE_LDW_S:
 797         case OPCODE_LDWA_S:
 798         case OPCODE_STW:
 799         case OPCODE_STWA:
 800                 align_mask = 3UL;
 801                 break;
 802
 803         default:
 804                 switch (regs->iir & OPCODE4_MASK) {
 805                 case OPCODE_LDH_L:
 806                 case OPCODE_STH_L:
 807                         align_mask = 1UL;
 808                         break;
 809                 case OPCODE_LDW_L:
 810                 case OPCODE_LDWM:
 811                 case OPCODE_STW_L:
 812                 case OPCODE_STWM:
 813                         align_mask = 3UL;
 814                         break;
 815                 }
 816                 break;
 817         }
 818
 819         return (int)(regs->ior & align_mask);
 820 }
 821