arch/parisc/kernel/unaligned.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *    Unaligned memory access handler
   4  *
   5  *    Copyright (C) 2001 Randolph Chung <tausq@debian.org>
   6  *    Copyright (C) 2022 Helge Deller <deller@gmx.de>
   7  *    Significantly tweaked by LaMont Jones <lamont@debian.org>
   8  */
   9
  10 #include <linux/sched/signal.h>
  11 #include <linux/signal.h>
  12 #include <linux/ratelimit.h>
  13 #include <linux/uaccess.h>
  14 #include <linux/sysctl.h>
  15 #include <asm/unaligned.h>
  16 #include <asm/hardirq.h>
  17 #include <asm/traps.h>
  18
  19 /* #define DEBUG_UNALIGNED 1 */
  20
  21 #ifdef DEBUG_UNALIGNED
  22 #define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __func__ ); printk(KERN_DEBUG fmt, ##args ); } while (0)
  23 #else
  24 #define DPRINTF(fmt, args...)
  25 #endif
  26
  27 #define RFMT "%#08lx"
  28
  29 /* 1111 1100 0000 0000 0001 0011 1100 0000 */
  30 #define OPCODE1(a,b,c)  ((a)<<26|(b)<<12|(c)<<6)
  31 #define OPCODE2(a,b)    ((a)<<26|(b)<<1)
  32 #define OPCODE3(a,b)    ((a)<<26|(b)<<2)
  33 #define OPCODE4(a)      ((a)<<26)
  34 #define OPCODE1_MASK    OPCODE1(0x3f,1,0xf)
  35 #define OPCODE2_MASK    OPCODE2(0x3f,1)
  36 #define OPCODE3_MASK    OPCODE3(0x3f,1)
  37 #define OPCODE4_MASK    OPCODE4(0x3f)
  38
  39 /* skip LDB - never unaligned (index) */
  40 #define OPCODE_LDH_I    OPCODE1(0x03,0,0x1)
  41 #define OPCODE_LDW_I    OPCODE1(0x03,0,0x2)
  42 #define OPCODE_LDD_I    OPCODE1(0x03,0,0x3)
  43 #define OPCODE_LDDA_I   OPCODE1(0x03,0,0x4)
  44 #define OPCODE_LDCD_I   OPCODE1(0x03,0,0x5)
  45 #define OPCODE_LDWA_I   OPCODE1(0x03,0,0x6)
  46 #define OPCODE_LDCW_I   OPCODE1(0x03,0,0x7)
  47 /* skip LDB - never unaligned (short) */
  48 #define OPCODE_LDH_S    OPCODE1(0x03,1,0x1)
  49 #define OPCODE_LDW_S    OPCODE1(0x03,1,0x2)
  50 #define OPCODE_LDD_S    OPCODE1(0x03,1,0x3)
  51 #define OPCODE_LDDA_S   OPCODE1(0x03,1,0x4)
  52 #define OPCODE_LDCD_S   OPCODE1(0x03,1,0x5)
  53 #define OPCODE_LDWA_S   OPCODE1(0x03,1,0x6)
  54 #define OPCODE_LDCW_S   OPCODE1(0x03,1,0x7)
  55 /* skip STB - never unaligned */
  56 #define OPCODE_STH      OPCODE1(0x03,1,0x9)
  57 #define OPCODE_STW      OPCODE1(0x03,1,0xa)
  58 #define OPCODE_STD      OPCODE1(0x03,1,0xb)
  59 /* skip STBY - never unaligned */
  60 /* skip STDBY - never unaligned */
  61 #define OPCODE_STWA     OPCODE1(0x03,1,0xe)
  62 #define OPCODE_STDA     OPCODE1(0x03,1,0xf)
  63
  64 #define OPCODE_FLDWX    OPCODE1(0x09,0,0x0)
  65 #define OPCODE_FLDWXR   OPCODE1(0x09,0,0x1)
  66 #define OPCODE_FSTWX    OPCODE1(0x09,0,0x8)
  67 #define OPCODE_FSTWXR   OPCODE1(0x09,0,0x9)
  68 #define OPCODE_FLDWS    OPCODE1(0x09,1,0x0)
  69 #define OPCODE_FLDWSR   OPCODE1(0x09,1,0x1)
  70 #define OPCODE_FSTWS    OPCODE1(0x09,1,0x8)
  71 #define OPCODE_FSTWSR   OPCODE1(0x09,1,0x9)
  72 #define OPCODE_FLDDX    OPCODE1(0x0b,0,0x0)
  73 #define OPCODE_FSTDX    OPCODE1(0x0b,0,0x8)
  74 #define OPCODE_FLDDS    OPCODE1(0x0b,1,0x0)
  75 #define OPCODE_FSTDS    OPCODE1(0x0b,1,0x8)
  76
  77 #define OPCODE_LDD_L    OPCODE2(0x14,0)
  78 #define OPCODE_FLDD_L   OPCODE2(0x14,1)
  79 #define OPCODE_STD_L    OPCODE2(0x1c,0)
  80 #define OPCODE_FSTD_L   OPCODE2(0x1c,1)
  81
  82 #define OPCODE_LDW_M    OPCODE3(0x17,1)
  83 #define OPCODE_FLDW_L   OPCODE3(0x17,0)
  84 #define OPCODE_FSTW_L   OPCODE3(0x1f,0)
  85 #define OPCODE_STW_M    OPCODE3(0x1f,1)
  86
  87 #define OPCODE_LDH_L    OPCODE4(0x11)
  88 #define OPCODE_LDW_L    OPCODE4(0x12)
  89 #define OPCODE_LDWM     OPCODE4(0x13)
  90 #define OPCODE_STH_L    OPCODE4(0x19)
  91 #define OPCODE_STW_L    OPCODE4(0x1A)
  92 #define OPCODE_STWM     OPCODE4(0x1B)
  93
  94 #define MAJOR_OP(i) (((i)>>26)&0x3f)
  95 #define R1(i) (((i)>>21)&0x1f)
  96 #define R2(i) (((i)>>16)&0x1f)
  97 #define R3(i) ((i)&0x1f)
  98 #define FR3(i) ((((i)&0x1f)<<1)|(((i)>>6)&1))
  99 #define IM(i,n) (((i)>>1&((1<<(n-1))-1))|((i)&1?((0-1L)<<(n-1)):0))
 100 #define IM5_2(i) IM((i)>>16,5)
 101 #define IM5_3(i) IM((i),5)
 102 #define IM14(i) IM((i),14)
 103
 104 #define ERR_NOTHANDLED  -1
 105
 106 int unaligned_enabled __read_mostly = 1;
 107
 108 static int emulate_ldh(struct pt_regs *regs, int toreg)
 109 {
 110         unsigned long saddr = regs->ior;
 111         unsigned long val = 0, temp1;
 112         ASM_EXCEPTIONTABLE_VAR(ret);
 113
 114         DPRINTF("load " RFMT ":" RFMT " to r%d for 2 bytes\n",
 115                 regs->isr, regs->ior, toreg);
 116
 117         __asm__ __volatile__  (
 118 "       mtsp    %4, %%sr1\n"
 119 "1:     ldbs    0(%%sr1,%3), %2\n"
 120 "2:     ldbs    1(%%sr1,%3), %0\n"
 121 "       depw    %2, 23, 24, %0\n"
 122 "3:     \n"
 123         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
 124         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
 125         : "+r" (val), "+r" (ret), "=&r" (temp1)
 126         : "r" (saddr), "r" (regs->isr) );
 127
 128         DPRINTF("val = " RFMT "\n", val);
 129
 130         if (toreg)
 131                 regs->gr[toreg] = val;
 132
 133         return ret;
 134 }
 135
 136 static int emulate_ldw(struct pt_regs *regs, int toreg, int flop)
 137 {
 138         unsigned long saddr = regs->ior;
 139         unsigned long val = 0, temp1, temp2;
 140         ASM_EXCEPTIONTABLE_VAR(ret);
 141
 142         DPRINTF("load " RFMT ":" RFMT " to r%d for 4 bytes\n",
 143                 regs->isr, regs->ior, toreg);
 144
 145         __asm__ __volatile__  (
 146 "       zdep    %4,28,2,%2\n"           /* r19=(ofs&3)*8 */
 147 "       mtsp    %5, %%sr1\n"
 148 "       depw    %%r0,31,2,%4\n"
 149 "1:     ldw     0(%%sr1,%4),%0\n"
 150 "2:     ldw     4(%%sr1,%4),%3\n"
 151 "       subi    32,%2,%2\n"
 152 "       mtctl   %2,11\n"
 153 "       vshd    %0,%3,%0\n"
 154 "3:     \n"
 155         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
 156         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
 157         : "+r" (val), "+r" (ret), "=&r" (temp1), "=&r" (temp2)
 158         : "r" (saddr), "r" (regs->isr) );
 159
 160         DPRINTF("val = " RFMT "\n", val);
 161
 162         if (flop)
 163                 ((__u32*)(regs->fr))[toreg] = val;
 164         else if (toreg)
 165                 regs->gr[toreg] = val;
 166
 167         return ret;
 168 }
 169 static int emulate_ldd(struct pt_regs *regs, int toreg, int flop)
 170 {
 171         unsigned long saddr = regs->ior;
 172         __u64 val = 0;
 173         ASM_EXCEPTIONTABLE_VAR(ret);
 174
 175         DPRINTF("load " RFMT ":" RFMT " to r%d for 8 bytes\n",
 176                 regs->isr, regs->ior, toreg);
 177
 178         if (!IS_ENABLED(CONFIG_64BIT) && !flop)
 179                 return ERR_NOTHANDLED;
 180
 181 #ifdef CONFIG_64BIT
 182         __asm__ __volatile__  (
 183 "       depd,z  %3,60,3,%%r19\n"                /* r19=(ofs&7)*8 */
 184 "       mtsp    %4, %%sr1\n"
 185 "       depd    %%r0,63,3,%3\n"
 186 "1:     ldd     0(%%sr1,%3),%0\n"
 187 "2:     ldd     8(%%sr1,%3),%%r20\n"
 188 "       subi    64,%%r19,%%r19\n"
 189 "       mtsar   %%r19\n"
 190 "       shrpd   %0,%%r20,%%sar,%0\n"
 191 "3:     \n"
 192         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
 193         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
 194         : "=r" (val), "+r" (ret)
 195         : "0" (val), "r" (saddr), "r" (regs->isr)
 196         : "r19", "r20" );
 197 #else
 198     {
 199         unsigned long shift, temp1;
 200         __asm__ __volatile__  (
 201 "       zdep    %2,29,2,%3\n"           /* r19=(ofs&3)*8 */
 202 "       mtsp    %5, %%sr1\n"
 203 "       dep     %%r0,31,2,%2\n"
 204 "1:     ldw     0(%%sr1,%2),%0\n"
 205 "2:     ldw     4(%%sr1,%2),%R0\n"
 206 "3:     ldw     8(%%sr1,%2),%4\n"
 207 "       subi    32,%3,%3\n"
 208 "       mtsar   %3\n"
 209 "       vshd    %0,%R0,%0\n"
 210 "       vshd    %R0,%4,%R0\n"
 211 "4:     \n"
 212         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 4b)
 213         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 4b)
 214         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 4b)
 215         : "+r" (val), "+r" (ret), "+r" (saddr), "=&r" (shift), "=&r" (temp1)
 216         : "r" (regs->isr) );
 217     }
 218 #endif
 219
 220         DPRINTF("val = 0x%llx\n", val);
 221
 222         if (flop)
 223                 regs->fr[toreg] = val;
 224         else if (toreg)
 225                 regs->gr[toreg] = val;
 226
 227         return ret;
 228 }
 229
 230 static int emulate_sth(struct pt_regs *regs, int frreg)
 231 {
 232         unsigned long val = regs->gr[frreg], temp1;
 233         ASM_EXCEPTIONTABLE_VAR(ret);
 234
 235         if (!frreg)
 236                 val = 0;
 237
 238         DPRINTF("store r%d (" RFMT ") to " RFMT ":" RFMT " for 2 bytes\n", frreg,
 239                 val, regs->isr, regs->ior);
 240
 241         __asm__ __volatile__ (
 242 "       mtsp %4, %%sr1\n"
 243 "       extrw,u %2, 23, 8, %1\n"
 244 "1:     stb %1, 0(%%sr1, %3)\n"
 245 "2:     stb %2, 1(%%sr1, %3)\n"
 246 "3:     \n"
 247         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
 248         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
 249         : "+r" (ret), "=&r" (temp1)
 250         : "r" (val), "r" (regs->ior), "r" (regs->isr) );
 251
 252         return ret;
 253 }
 254
 255 static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
 256 {
 257         unsigned long val;
 258         ASM_EXCEPTIONTABLE_VAR(ret);
 259
 260         if (flop)
 261                 val = ((__u32*)(regs->fr))[frreg];
 262         else if (frreg)
 263                 val = regs->gr[frreg];
 264         else
 265                 val = 0;
 266
 267         DPRINTF("store r%d (" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg,
 268                 val, regs->isr, regs->ior);
 269
 270
 271         __asm__ __volatile__ (
 272 "       mtsp %3, %%sr1\n"
 273 "       zdep    %2, 28, 2, %%r19\n"
 274 "       dep     %%r0, 31, 2, %2\n"
 275 "       mtsar   %%r19\n"
 276 "       depwi,z -2, %%sar, 32, %%r19\n"
 277 "1:     ldw     0(%%sr1,%2),%%r20\n"
 278 "2:     ldw     4(%%sr1,%2),%%r21\n"
 279 "       vshd    %%r0, %1, %%r22\n"
 280 "       vshd    %1, %%r0, %%r1\n"
 281 "       and     %%r20, %%r19, %%r20\n"
 282 "       andcm   %%r21, %%r19, %%r21\n"
 283 "       or      %%r22, %%r20, %%r20\n"
 284 "       or      %%r1, %%r21, %%r21\n"
 285 "       stw     %%r20,0(%%sr1,%2)\n"
 286 "       stw     %%r21,4(%%sr1,%2)\n"
 287 "3:     \n"
 288         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
 289         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
 290         : "+r" (ret)
 291         : "r" (val), "r" (regs->ior), "r" (regs->isr)
 292         : "r19", "r20", "r21", "r22", "r1" );
 293
 294         return ret;
 295 }
 296 static int emulate_std(struct pt_regs *regs, int frreg, int flop)
 297 {
 298         __u64 val;
 299         ASM_EXCEPTIONTABLE_VAR(ret);
 300
 301         if (flop)
 302                 val = regs->fr[frreg];
 303         else if (frreg)
 304                 val = regs->gr[frreg];
 305         else
 306                 val = 0;
 307
 308         DPRINTF("store r%d (0x%016llx) to " RFMT ":" RFMT " for 8 bytes\n", frreg,
 309                 val,  regs->isr, regs->ior);
 310
 311         if (!IS_ENABLED(CONFIG_64BIT) && !flop)
 312                 return ERR_NOTHANDLED;
 313
 314 #ifdef CONFIG_64BIT
 315         __asm__ __volatile__ (
 316 "       mtsp %3, %%sr1\n"
 317 "       depd,z  %2, 60, 3, %%r19\n"
 318 "       depd    %%r0, 63, 3, %2\n"
 319 "       mtsar   %%r19\n"
 320 "       depdi,z -2, %%sar, 64, %%r19\n"
 321 "1:     ldd     0(%%sr1,%2),%%r20\n"
 322 "2:     ldd     8(%%sr1,%2),%%r21\n"
 323 "       shrpd   %%r0, %1, %%sar, %%r22\n"
 324 "       shrpd   %1, %%r0, %%sar, %%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 "3:     std     %%r20,0(%%sr1,%2)\n"
 330 "4:     std     %%r21,8(%%sr1,%2)\n"
 331 "5:     \n"
 332         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 5b)
 333         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 5b)
 334         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 5b)
 335         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(4b, 5b)
 336         : "+r" (ret)
 337         : "r" (val), "r" (regs->ior), "r" (regs->isr)
 338         : "r19", "r20", "r21", "r22", "r1" );
 339 #else
 340     {
 341         unsigned long valh = (val >> 32), vall = (val & 0xffffffffl);
 342         __asm__ __volatile__ (
 343 "       mtsp    %4, %%sr1\n"
 344 "       zdep    %2, 29, 2, %%r19\n"
 345 "       dep     %%r0, 31, 2, %3\n"
 346 "       mtsar   %%r19\n"
 347 "       zvdepi  -2, 32, %%r19\n"
 348 "1:     ldw     0(%%sr1,%3),%%r20\n"
 349 "2:     ldw     8(%%sr1,%3),%%r21\n"
 350 "       vshd    %1, %2, %%r1\n"
 351 "       vshd    %%r0, %1, %1\n"
 352 "       vshd    %2, %%r0, %2\n"
 353 "       and     %%r20, %%r19, %%r20\n"
 354 "       andcm   %%r21, %%r19, %%r21\n"
 355 "       or      %1, %%r20, %1\n"
 356 "       or      %2, %%r21, %2\n"
 357 "3:     stw     %1,0(%%sr1,%3)\n"
 358 "4:     stw     %%r1,4(%%sr1,%3)\n"
 359 "5:     stw     %2,8(%%sr1,%3)\n"
 360 "6:     \n"
 361         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 6b)
 362         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 6b)
 363         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 6b)
 364         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(4b, 6b)
 365         ASM_EXCEPTIONTABLE_ENTRY_EFAULT(5b, 6b)
 366         : "+r" (ret)
 367         : "r" (valh), "r" (vall), "r" (regs->ior), "r" (regs->isr)
 368         : "r19", "r20", "r21", "r1" );
 369     }
 370 #endif
 371
 372         return ret;
 373 }
 374
 375 void handle_unaligned(struct pt_regs *regs)
 376 {
 377         static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
 378         unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
 379         int modify = 0;
 380         int ret = ERR_NOTHANDLED;
 381
 382         __inc_irq_stat(irq_unaligned_count);
 383
 384         /* log a message with pacing */
 385         if (user_mode(regs)) {
 386                 if (current->thread.flags & PARISC_UAC_SIGBUS) {
 387                         goto force_sigbus;
 388                 }
 389
 390                 if (!(current->thread.flags & PARISC_UAC_NOPRINT) &&
 391                         __ratelimit(&ratelimit)) {
 392                         printk(KERN_WARNING "%s(%d): unaligned access to " RFMT
 393                                 " at ip " RFMT " (iir " RFMT ")\n",
 394                                 current->comm, task_pid_nr(current), regs->ior,
 395                                 regs->iaoq[0], regs->iir);
 396 #ifdef DEBUG_UNALIGNED
 397                         show_regs(regs);
 398 #endif
 399                 }
 400
 401                 if (!unaligned_enabled)
 402                         goto force_sigbus;
 403         }
 404
 405         /* handle modification - OK, it's ugly, see the instruction manual */
 406         switch (MAJOR_OP(regs->iir))
 407         {
 408         case 0x03:
 409         case 0x09:
 410         case 0x0b:
 411                 if (regs->iir&0x20)
 412                 {
 413                         modify = 1;
 414                         if (regs->iir&0x1000)           /* short loads */
 415                                 if (regs->iir&0x200)
 416                                         newbase += IM5_3(regs->iir);
 417                                 else
 418                                         newbase += IM5_2(regs->iir);
 419                         else if (regs->iir&0x2000)      /* scaled indexed */
 420                         {
 421                                 int shift=0;
 422                                 switch (regs->iir & OPCODE1_MASK)
 423                                 {
 424                                 case OPCODE_LDH_I:
 425                                         shift= 1; break;
 426                                 case OPCODE_LDW_I:
 427                                         shift= 2; break;
 428                                 case OPCODE_LDD_I:
 429                                 case OPCODE_LDDA_I:
 430                                         shift= 3; break;
 431                                 }
 432                                 newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0)<<shift;
 433                         } else                          /* simple indexed */
 434                                 newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0);
 435                 }
 436                 break;
 437         case 0x13:
 438         case 0x1b:
 439                 modify = 1;
 440                 newbase += IM14(regs->iir);
 441                 break;
 442         case 0x14:
 443         case 0x1c:
 444                 if (regs->iir&8)
 445                 {
 446                         modify = 1;
 447                         newbase += IM14(regs->iir&~0xe);
 448                 }
 449                 break;
 450         case 0x16:
 451         case 0x1e:
 452                 modify = 1;
 453                 newbase += IM14(regs->iir&6);
 454                 break;
 455         case 0x17:
 456         case 0x1f:
 457                 if (regs->iir&4)
 458                 {
 459                         modify = 1;
 460                         newbase += IM14(regs->iir&~4);
 461                 }
 462                 break;
 463         }
 464
 465         /* TODO: make this cleaner... */
 466         switch (regs->iir & OPCODE1_MASK)
 467         {
 468         case OPCODE_LDH_I:
 469         case OPCODE_LDH_S:
 470                 ret = emulate_ldh(regs, R3(regs->iir));
 471                 break;
 472
 473         case OPCODE_LDW_I:
 474         case OPCODE_LDWA_I:
 475         case OPCODE_LDW_S:
 476         case OPCODE_LDWA_S:
 477                 ret = emulate_ldw(regs, R3(regs->iir), 0);
 478                 break;
 479
 480         case OPCODE_STH:
 481                 ret = emulate_sth(regs, R2(regs->iir));
 482                 break;
 483
 484         case OPCODE_STW:
 485         case OPCODE_STWA:
 486                 ret = emulate_stw(regs, R2(regs->iir), 0);
 487                 break;
 488
 489 #ifdef CONFIG_64BIT
 490         case OPCODE_LDD_I:
 491         case OPCODE_LDDA_I:
 492         case OPCODE_LDD_S:
 493         case OPCODE_LDDA_S:
 494                 ret = emulate_ldd(regs, R3(regs->iir), 0);
 495                 break;
 496
 497         case OPCODE_STD:
 498         case OPCODE_STDA:
 499                 ret = emulate_std(regs, R2(regs->iir), 0);
 500                 break;
 501 #endif
 502
 503         case OPCODE_FLDWX:
 504         case OPCODE_FLDWS:
 505         case OPCODE_FLDWXR:
 506         case OPCODE_FLDWSR:
 507                 ret = emulate_ldw(regs, FR3(regs->iir), 1);
 508                 break;
 509
 510         case OPCODE_FLDDX:
 511         case OPCODE_FLDDS:
 512                 ret = emulate_ldd(regs, R3(regs->iir), 1);
 513                 break;
 514
 515         case OPCODE_FSTWX:
 516         case OPCODE_FSTWS:
 517         case OPCODE_FSTWXR:
 518         case OPCODE_FSTWSR:
 519                 ret = emulate_stw(regs, FR3(regs->iir), 1);
 520                 break;
 521
 522         case OPCODE_FSTDX:
 523         case OPCODE_FSTDS:
 524                 ret = emulate_std(regs, R3(regs->iir), 1);
 525                 break;
 526
 527         case OPCODE_LDCD_I:
 528         case OPCODE_LDCW_I:
 529         case OPCODE_LDCD_S:
 530         case OPCODE_LDCW_S:
 531                 ret = ERR_NOTHANDLED;   /* "undefined", but lets kill them. */
 532                 break;
 533         }
 534         switch (regs->iir & OPCODE2_MASK)
 535         {
 536         case OPCODE_FLDD_L:
 537                 ret = emulate_ldd(regs,R2(regs->iir),1);
 538                 break;
 539         case OPCODE_FSTD_L:
 540                 ret = emulate_std(regs, R2(regs->iir),1);
 541                 break;
 542 #ifdef CONFIG_64BIT
 543         case OPCODE_LDD_L:
 544                 ret = emulate_ldd(regs, R2(regs->iir),0);
 545                 break;
 546         case OPCODE_STD_L:
 547                 ret = emulate_std(regs, R2(regs->iir),0);
 548                 break;
 549 #endif
 550         }
 551         switch (regs->iir & OPCODE3_MASK)
 552         {
 553         case OPCODE_FLDW_L:
 554                 ret = emulate_ldw(regs, R2(regs->iir), 1);
 555                 break;
 556         case OPCODE_LDW_M:
 557                 ret = emulate_ldw(regs, R2(regs->iir), 0);
 558                 break;
 559
 560         case OPCODE_FSTW_L:
 561                 ret = emulate_stw(regs, R2(regs->iir),1);
 562                 break;
 563         case OPCODE_STW_M:
 564                 ret = emulate_stw(regs, R2(regs->iir),0);
 565                 break;
 566         }
 567         switch (regs->iir & OPCODE4_MASK)
 568         {
 569         case OPCODE_LDH_L:
 570                 ret = emulate_ldh(regs, R2(regs->iir));
 571                 break;
 572         case OPCODE_LDW_L:
 573         case OPCODE_LDWM:
 574                 ret = emulate_ldw(regs, R2(regs->iir),0);
 575                 break;
 576         case OPCODE_STH_L:
 577                 ret = emulate_sth(regs, R2(regs->iir));
 578                 break;
 579         case OPCODE_STW_L:
 580         case OPCODE_STWM:
 581                 ret = emulate_stw(regs, R2(regs->iir),0);
 582                 break;
 583         }
 584
 585         if (ret == 0 && modify && R1(regs->iir))
 586                 regs->gr[R1(regs->iir)] = newbase;
 587
 588
 589         if (ret == ERR_NOTHANDLED)
 590                 printk(KERN_CRIT "Not-handled unaligned insn 0x%08lx\n", regs->iir);
 591
 592         DPRINTF("ret = %d\n", ret);
 593
 594         if (ret)
 595         {
 596                 /*
 597                  * The unaligned handler failed.
 598                  * If we were called by __get_user() or __put_user() jump
 599                  * to it's exception fixup handler instead of crashing.
 600                  */
 601                 if (!user_mode(regs) && fixup_exception(regs))
 602                         return;
 603
 604                 printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret);
 605                 die_if_kernel("Unaligned data reference", regs, 28);
 606
 607                 if (ret == -EFAULT)
 608                 {
 609                         force_sig_fault(SIGSEGV, SEGV_MAPERR,
 610                                         (void __user *)regs->ior);
 611                 }
 612                 else
 613                 {
 614 force_sigbus:
 615                         /* couldn't handle it ... */
 616                         force_sig_fault(SIGBUS, BUS_ADRALN,
 617                                         (void __user *)regs->ior);
 618                 }
 619
 620                 return;
 621         }
 622
 623         /* else we handled it, let life go on. */
 624         regs->gr[0]|=PSW_N;
 625 }
 626
 627 /*
 628  * NB: check_unaligned() is only used for PCXS processors right
 629  * now, so we only check for PA1.1 encodings at this point.
 630  */
 631
 632 int
 633 check_unaligned(struct pt_regs *regs)
 634 {
 635         unsigned long align_mask;
 636
 637         /* Get alignment mask */
 638
 639         align_mask = 0UL;
 640         switch (regs->iir & OPCODE1_MASK) {
 641
 642         case OPCODE_LDH_I:
 643         case OPCODE_LDH_S:
 644         case OPCODE_STH:
 645                 align_mask = 1UL;
 646                 break;
 647
 648         case OPCODE_LDW_I:
 649         case OPCODE_LDWA_I:
 650         case OPCODE_LDW_S:
 651         case OPCODE_LDWA_S:
 652         case OPCODE_STW:
 653         case OPCODE_STWA:
 654                 align_mask = 3UL;
 655                 break;
 656
 657         default:
 658                 switch (regs->iir & OPCODE4_MASK) {
 659                 case OPCODE_LDH_L:
 660                 case OPCODE_STH_L:
 661                         align_mask = 1UL;
 662                         break;
 663                 case OPCODE_LDW_L:
 664                 case OPCODE_LDWM:
 665                 case OPCODE_STW_L:
 666                 case OPCODE_STWM:
 667                         align_mask = 3UL;
 668                         break;
 669                 }
 670                 break;
 671         }
 672
 673         return (int)(regs->ior & align_mask);
 674 }
 675