arch/parisc/kernel/unaligned.c

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