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