include/asm-cris/arch-v32/uaccess.h

   1 /*
   2  * Authors:    Hans-Peter Nilsson (hp@axis.com)
   3  *
   4  */
   5 #ifndef _CRIS_ARCH_UACCESS_H
   6 #define _CRIS_ARCH_UACCESS_H
   7
   8 /*
   9  * We don't tell gcc that we are accessing memory, but this is OK
  10  * because we do not write to any memory gcc knows about, so there
  11  * are no aliasing issues.
  12  *
  13  * Note that PC at a fault is the address *at* the faulting
  14  * instruction for CRISv32.
  15  */
  16 #define __put_user_asm(x, addr, err, op)                        \
  17         __asm__ __volatile__(                                   \
  18                 "2:     "op" %1,[%2]\n"                         \
  19                 "4:\n"                                          \
  20                 "       .section .fixup,\"ax\"\n"               \
  21                 "3:     move.d %3,%0\n"                         \
  22                 "       jump 4b\n"                              \
  23                 "       nop\n"                                  \
  24                 "       .previous\n"                            \
  25                 "       .section __ex_table,\"a\"\n"            \
  26                 "       .dword 2b,3b\n"                         \
  27                 "       .previous\n"                            \
  28                 : "=r" (err)                                    \
  29                 : "r" (x), "r" (addr), "g" (-EFAULT), "0" (err))
  30
  31 #define __put_user_asm_64(x, addr, err) do {                    \
  32         int dummy_for_put_user_asm_64_;                         \
  33         __asm__ __volatile__(                                   \
  34                 "2:     move.d %M2,[%1+]\n"                     \
  35                 "4:     move.d %H2,[%1]\n"                      \
  36                 "5:\n"                                          \
  37                 "       .section .fixup,\"ax\"\n"               \
  38                 "3:     move.d %4,%0\n"                         \
  39                 "       jump 5b\n"                              \
  40                 "       .previous\n"                            \
  41                 "       .section __ex_table,\"a\"\n"            \
  42                 "       .dword 2b,3b\n"                         \
  43                 "       .dword 4b,3b\n"                         \
  44                 "       .previous\n"                            \
  45                 : "=r" (err), "=b" (dummy_for_put_user_asm_64_) \
  46                 : "r" (x), "1" (addr), "g" (-EFAULT),           \
  47                   "0" (err));                                   \
  48         } while (0)
  49
  50 /* See comment before __put_user_asm.  */
  51
  52 #define __get_user_asm(x, addr, err, op)                \
  53         __asm__ __volatile__(                           \
  54                 "2:     "op" [%2],%1\n"                 \
  55                 "4:\n"                                  \
  56                 "       .section .fixup,\"ax\"\n"       \
  57                 "3:     move.d %3,%0\n"                 \
  58                 "       jump 4b\n"                      \
  59                 "       moveq 0,%1\n"                   \
  60                 "       .previous\n"                    \
  61                 "       .section __ex_table,\"a\"\n"    \
  62                 "       .dword 2b,3b\n"                 \
  63                 "       .previous\n"                    \
  64                 : "=r" (err), "=r" (x)                  \
  65                 : "r" (addr), "g" (-EFAULT), "0" (err))
  66
  67 #define __get_user_asm_64(x, addr, err) do {            \
  68         int dummy_for_get_user_asm_64_;                 \
  69         __asm__ __volatile__(                           \
  70                 "2:     move.d [%2+],%M1\n"             \
  71                 "4:     move.d [%2],%H1\n"              \
  72                 "5:\n"                                  \
  73                 "       .section .fixup,\"ax\"\n"       \
  74                 "3:     move.d %4,%0\n"                 \
  75                 "       jump 5b\n"                      \
  76                 "       moveq 0,%1\n"                   \
  77                 "       .previous\n"                    \
  78                 "       .section __ex_table,\"a\"\n"    \
  79                 "       .dword 2b,3b\n"                 \
  80                 "       .dword 4b,3b\n"                 \
  81                 "       .previous\n"                    \
  82                 : "=r" (err), "=r" (x),                 \
  83                   "=b" (dummy_for_get_user_asm_64_)     \
  84                 : "2" (addr), "g" (-EFAULT), "0" (err));\
  85         } while (0)
  86
  87 /*
  88  * Copy a null terminated string from userspace.
  89  *
  90  * Must return:
  91  * -EFAULT              for an exception
  92  * count                if we hit the buffer limit
  93  * bytes copied         if we hit a null byte
  94  * (without the null byte)
  95  */
  96 extern inline long
  97 __do_strncpy_from_user(char *dst, const char *src, long count)
  98 {
  99         long res;
 100
 101         if (count == 0)
 102                 return 0;
 103
 104         /*
 105          * Currently, in 2.4.0-test9, most ports use a simple byte-copy loop.
 106          *  So do we.
 107          *
 108          *  This code is deduced from:
 109          *
 110          *      char tmp2;
 111          *      long tmp1, tmp3;
 112          *      tmp1 = count;
 113          *      while ((*dst++ = (tmp2 = *src++)) != 0
 114          *             && --tmp1)
 115          *        ;
 116          *
 117          *      res = count - tmp1;
 118          *
 119          *  with tweaks.
 120          */
 121
 122         __asm__ __volatile__ (
 123                 "       move.d %3,%0\n"
 124                 "5:     move.b [%2+],$acr\n"
 125                 "1:     beq 2f\n"
 126                 "       move.b $acr,[%1+]\n"
 127
 128                 "       subq 1,%0\n"
 129                 "2:     bne 1b\n"
 130                 "       move.b [%2+],$acr\n"
 131
 132                 "       sub.d %3,%0\n"
 133                 "       neg.d %0,%0\n"
 134                 "3:\n"
 135                 "       .section .fixup,\"ax\"\n"
 136                 "4:     move.d %7,%0\n"
 137                 "       jump 3b\n"
 138                 "       nop\n"
 139
 140                 /* The address for a fault at the first move is trivial.
 141                    The address for a fault at the second move is that of
 142                    the preceding branch insn, since the move insn is in
 143                    its delay-slot.  That address is also a branch
 144                    target.  Just so you don't get confused...  */
 145                 "       .previous\n"
 146                 "       .section __ex_table,\"a\"\n"
 147                 "       .dword 5b,4b\n"
 148                 "       .dword 2b,4b\n"
 149                 "       .previous"
 150                 : "=r" (res), "=b" (dst), "=b" (src), "=r" (count)
 151                 : "3" (count), "1" (dst), "2" (src), "g" (-EFAULT)
 152                 : "acr");
 153
 154         return res;
 155 }
 156
 157 /* A few copy asms to build up the more complex ones from.
 158
 159    Note again, a post-increment is performed regardless of whether a bus
 160    fault occurred in that instruction, and PC for a faulted insn is the
 161    address for the insn, or for the preceding branch when in a delay-slot.  */
 162
 163 #define __asm_copy_user_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 164         __asm__ __volatile__ (                          \
 165                         COPY                            \
 166                 "1:\n"                                  \
 167                 "       .section .fixup,\"ax\"\n"       \
 168                         FIXUP                           \
 169                 "       .previous\n"                    \
 170                 "       .section __ex_table,\"a\"\n"    \
 171                         TENTRY                          \
 172                 "       .previous\n"                    \
 173                 : "=b" (to), "=b" (from), "=r" (ret)    \
 174                 : "0" (to), "1" (from), "2" (ret)       \
 175                 : "acr", "memory")
 176
 177 #define __asm_copy_from_user_1(to, from, ret) \
 178         __asm_copy_user_cont(to, from, ret,     \
 179                 "2:     move.b [%1+],$acr\n"    \
 180                 "       move.b $acr,[%0+]\n",   \
 181                 "3:     addq 1,%2\n"            \
 182                 "       jump 1b\n"              \
 183                 "       clear.b [%0+]\n",       \
 184                 "       .dword 2b,3b\n")
 185
 186 #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 187         __asm_copy_user_cont(to, from, ret,             \
 188                         COPY                            \
 189                 "2:     move.w [%1+],$acr\n"            \
 190                 "       move.w $acr,[%0+]\n",           \
 191                         FIXUP                           \
 192                 "3:     addq 2,%2\n"                    \
 193                 "       jump 1b\n"                      \
 194                 "       clear.w [%0+]\n",               \
 195                         TENTRY                          \
 196                 "       .dword 2b,3b\n")
 197
 198 #define __asm_copy_from_user_2(to, from, ret) \
 199         __asm_copy_from_user_2x_cont(to, from, ret, "", "", "")
 200
 201 #define __asm_copy_from_user_3(to, from, ret)           \
 202         __asm_copy_from_user_2x_cont(to, from, ret,     \
 203                 "4:     move.b [%1+],$acr\n"            \
 204                 "       move.b $acr,[%0+]\n",           \
 205                 "5:     addq 1,%2\n"                    \
 206                 "       clear.b [%0+]\n",               \
 207                 "       .dword 4b,5b\n")
 208
 209 #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 210         __asm_copy_user_cont(to, from, ret,             \
 211                         COPY                            \
 212                 "2:     move.d [%1+],$acr\n"            \
 213                 "       move.d $acr,[%0+]\n",           \
 214                         FIXUP                           \
 215                 "3:     addq 4,%2\n"                    \
 216                 "       jump 1b\n"                      \
 217                 "       clear.d [%0+]\n",               \
 218                         TENTRY                          \
 219                 "       .dword 2b,3b\n")
 220
 221 #define __asm_copy_from_user_4(to, from, ret) \
 222         __asm_copy_from_user_4x_cont(to, from, ret, "", "", "")
 223
 224 #define __asm_copy_from_user_5(to, from, ret) \
 225         __asm_copy_from_user_4x_cont(to, from, ret,     \
 226                 "4:     move.b [%1+],$acr\n"            \
 227                 "       move.b $acr,[%0+]\n",           \
 228                 "5:     addq 1,%2\n"                    \
 229                 "       clear.b [%0+]\n",               \
 230                 "       .dword 4b,5b\n")
 231
 232 #define __asm_copy_from_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 233         __asm_copy_from_user_4x_cont(to, from, ret,     \
 234                         COPY                            \
 235                 "4:     move.w [%1+],$acr\n"            \
 236                 "       move.w $acr,[%0+]\n",           \
 237                         FIXUP                           \
 238                 "5:     addq 2,%2\n"                    \
 239                 "       clear.w [%0+]\n",               \
 240                         TENTRY                          \
 241                 "       .dword 4b,5b\n")
 242
 243 #define __asm_copy_from_user_6(to, from, ret) \
 244         __asm_copy_from_user_6x_cont(to, from, ret, "", "", "")
 245
 246 #define __asm_copy_from_user_7(to, from, ret) \
 247         __asm_copy_from_user_6x_cont(to, from, ret,     \
 248                 "6:     move.b [%1+],$acr\n"            \
 249                 "       move.b $acr,[%0+]\n",           \
 250                 "7:     addq 1,%2\n"                    \
 251                 "       clear.b [%0+]\n",               \
 252                 "       .dword 6b,7b\n")
 253
 254 #define __asm_copy_from_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 255         __asm_copy_from_user_4x_cont(to, from, ret,     \
 256                         COPY                            \
 257                 "4:     move.d [%1+],$acr\n"            \
 258                 "       move.d $acr,[%0+]\n",           \
 259                         FIXUP                           \
 260                 "5:     addq 4,%2\n"                    \
 261                 "       clear.d [%0+]\n",               \
 262                         TENTRY                          \
 263                 "       .dword 4b,5b\n")
 264
 265 #define __asm_copy_from_user_8(to, from, ret) \
 266         __asm_copy_from_user_8x_cont(to, from, ret, "", "", "")
 267
 268 #define __asm_copy_from_user_9(to, from, ret) \
 269         __asm_copy_from_user_8x_cont(to, from, ret,     \
 270                 "6:     move.b [%1+],$acr\n"            \
 271                 "       move.b $acr,[%0+]\n",           \
 272                 "7:     addq 1,%2\n"                    \
 273                 "       clear.b [%0+]\n",               \
 274                 "       .dword 6b,7b\n")
 275
 276 #define __asm_copy_from_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 277         __asm_copy_from_user_8x_cont(to, from, ret,     \
 278                         COPY                            \
 279                 "6:     move.w [%1+],$acr\n"            \
 280                 "       move.w $acr,[%0+]\n",           \
 281                         FIXUP                           \
 282                 "7:     addq 2,%2\n"                    \
 283                 "       clear.w [%0+]\n",               \
 284                         TENTRY                          \
 285                 "       .dword 6b,7b\n")
 286
 287 #define __asm_copy_from_user_10(to, from, ret) \
 288         __asm_copy_from_user_10x_cont(to, from, ret, "", "", "")
 289
 290 #define __asm_copy_from_user_11(to, from, ret)          \
 291         __asm_copy_from_user_10x_cont(to, from, ret,    \
 292                 "8:     move.b [%1+],$acr\n"            \
 293                 "       move.b $acr,[%0+]\n",           \
 294                 "9:     addq 1,%2\n"                    \
 295                 "       clear.b [%0+]\n",               \
 296                 "       .dword 8b,9b\n")
 297
 298 #define __asm_copy_from_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 299         __asm_copy_from_user_8x_cont(to, from, ret,     \
 300                         COPY                            \
 301                 "6:     move.d [%1+],$acr\n"            \
 302                 "       move.d $acr,[%0+]\n",           \
 303                         FIXUP                           \
 304                 "7:     addq 4,%2\n"                    \
 305                 "       clear.d [%0+]\n",               \
 306                         TENTRY                          \
 307                 "       .dword 6b,7b\n")
 308
 309 #define __asm_copy_from_user_12(to, from, ret) \
 310         __asm_copy_from_user_12x_cont(to, from, ret, "", "", "")
 311
 312 #define __asm_copy_from_user_13(to, from, ret) \
 313         __asm_copy_from_user_12x_cont(to, from, ret,    \
 314                 "8:     move.b [%1+],$acr\n"            \
 315                 "       move.b $acr,[%0+]\n",           \
 316                 "9:     addq 1,%2\n"                    \
 317                 "       clear.b [%0+]\n",               \
 318                 "       .dword 8b,9b\n")
 319
 320 #define __asm_copy_from_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 321         __asm_copy_from_user_12x_cont(to, from, ret,    \
 322                         COPY                            \
 323                 "8:     move.w [%1+],$acr\n"            \
 324                 "       move.w $acr,[%0+]\n",           \
 325                         FIXUP                           \
 326                 "9:     addq 2,%2\n"                    \
 327                 "       clear.w [%0+]\n",               \
 328                         TENTRY                          \
 329                 "       .dword 8b,9b\n")
 330
 331 #define __asm_copy_from_user_14(to, from, ret) \
 332         __asm_copy_from_user_14x_cont(to, from, ret, "", "", "")
 333
 334 #define __asm_copy_from_user_15(to, from, ret) \
 335         __asm_copy_from_user_14x_cont(to, from, ret,    \
 336                 "10:    move.b [%1+],$acr\n"            \
 337                 "       move.b $acr,[%0+]\n",           \
 338                 "11:    addq 1,%2\n"                    \
 339                 "       clear.b [%0+]\n",               \
 340                 "       .dword 10b,11b\n")
 341
 342 #define __asm_copy_from_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 343         __asm_copy_from_user_12x_cont(to, from, ret,    \
 344                         COPY                            \
 345                 "8:     move.d [%1+],$acr\n"            \
 346                 "       move.d $acr,[%0+]\n",           \
 347                         FIXUP                           \
 348                 "9:     addq 4,%2\n"                    \
 349                 "       clear.d [%0+]\n",               \
 350                         TENTRY                          \
 351                 "       .dword 8b,9b\n")
 352
 353 #define __asm_copy_from_user_16(to, from, ret) \
 354         __asm_copy_from_user_16x_cont(to, from, ret, "", "", "")
 355
 356 #define __asm_copy_from_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 357         __asm_copy_from_user_16x_cont(to, from, ret,    \
 358                         COPY                            \
 359                 "10:    move.d [%1+],$acr\n"            \
 360                 "       move.d $acr,[%0+]\n",           \
 361                         FIXUP                           \
 362                 "11:    addq 4,%2\n"                    \
 363                 "       clear.d [%0+]\n",               \
 364                         TENTRY                          \
 365                 "       .dword 10b,11b\n")
 366
 367 #define __asm_copy_from_user_20(to, from, ret) \
 368         __asm_copy_from_user_20x_cont(to, from, ret, "", "", "")
 369
 370 #define __asm_copy_from_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 371         __asm_copy_from_user_20x_cont(to, from, ret,    \
 372                         COPY                            \
 373                 "12:    move.d [%1+],$acr\n"            \
 374                 "       move.d $acr,[%0+]\n",           \
 375                         FIXUP                           \
 376                 "13:    addq 4,%2\n"                    \
 377                 "       clear.d [%0+]\n",               \
 378                         TENTRY                          \
 379                 "       .dword 12b,13b\n")
 380
 381 #define __asm_copy_from_user_24(to, from, ret) \
 382         __asm_copy_from_user_24x_cont(to, from, ret, "", "", "")
 383
 384 /* And now, the to-user ones.  */
 385
 386 #define __asm_copy_to_user_1(to, from, ret)     \
 387         __asm_copy_user_cont(to, from, ret,     \
 388                 "       move.b [%1+],$acr\n"    \
 389                 "2:     move.b $acr,[%0+]\n",   \
 390                 "3:     jump 1b\n"              \
 391                 "       addq 1,%2\n",           \
 392                 "       .dword 2b,3b\n")
 393
 394 #define __asm_copy_to_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 395         __asm_copy_user_cont(to, from, ret,             \
 396                         COPY                            \
 397                 "       move.w [%1+],$acr\n"            \
 398                 "2:     move.w $acr,[%0+]\n",           \
 399                         FIXUP                           \
 400                 "3:     jump 1b\n"                      \
 401                 "       addq 2,%2\n",                   \
 402                         TENTRY                          \
 403                 "       .dword 2b,3b\n")
 404
 405 #define __asm_copy_to_user_2(to, from, ret) \
 406         __asm_copy_to_user_2x_cont(to, from, ret, "", "", "")
 407
 408 #define __asm_copy_to_user_3(to, from, ret) \
 409         __asm_copy_to_user_2x_cont(to, from, ret,       \
 410                 "       move.b [%1+],$acr\n"            \
 411                 "4:     move.b $acr,[%0+]\n",           \
 412                 "5:     addq 1,%2\n",                   \
 413                 "       .dword 4b,5b\n")
 414
 415 #define __asm_copy_to_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 416         __asm_copy_user_cont(to, from, ret,             \
 417                         COPY                            \
 418                 "       move.d [%1+],$acr\n"            \
 419                 "2:     move.d $acr,[%0+]\n",           \
 420                         FIXUP                           \
 421                 "3:     jump 1b\n"                      \
 422                 "       addq 4,%2\n",                   \
 423                         TENTRY                          \
 424                 "       .dword 2b,3b\n")
 425
 426 #define __asm_copy_to_user_4(to, from, ret) \
 427         __asm_copy_to_user_4x_cont(to, from, ret, "", "", "")
 428
 429 #define __asm_copy_to_user_5(to, from, ret) \
 430         __asm_copy_to_user_4x_cont(to, from, ret,       \
 431                 "       move.b [%1+],$acr\n"            \
 432                 "4:     move.b $acr,[%0+]\n",           \
 433                 "5:     addq 1,%2\n",                   \
 434                 "       .dword 4b,5b\n")
 435
 436 #define __asm_copy_to_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 437         __asm_copy_to_user_4x_cont(to, from, ret,       \
 438                         COPY                            \
 439                 "       move.w [%1+],$acr\n"            \
 440                 "4:     move.w $acr,[%0+]\n",           \
 441                         FIXUP                           \
 442                 "5:     addq 2,%2\n",                   \
 443                         TENTRY                          \
 444                 "       .dword 4b,5b\n")
 445
 446 #define __asm_copy_to_user_6(to, from, ret) \
 447         __asm_copy_to_user_6x_cont(to, from, ret, "", "", "")
 448
 449 #define __asm_copy_to_user_7(to, from, ret) \
 450         __asm_copy_to_user_6x_cont(to, from, ret,       \
 451                 "       move.b [%1+],$acr\n"            \
 452                 "6:     move.b $acr,[%0+]\n",           \
 453                 "7:     addq 1,%2\n",                   \
 454                 "       .dword 6b,7b\n")
 455
 456 #define __asm_copy_to_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 457         __asm_copy_to_user_4x_cont(to, from, ret,       \
 458                         COPY                            \
 459                 "       move.d [%1+],$acr\n"            \
 460                 "4:     move.d $acr,[%0+]\n",           \
 461                         FIXUP                           \
 462                 "5:     addq 4,%2\n",                   \
 463                         TENTRY                          \
 464                 "       .dword 4b,5b\n")
 465
 466 #define __asm_copy_to_user_8(to, from, ret) \
 467         __asm_copy_to_user_8x_cont(to, from, ret, "", "", "")
 468
 469 #define __asm_copy_to_user_9(to, from, ret) \
 470         __asm_copy_to_user_8x_cont(to, from, ret,       \
 471                 "       move.b [%1+],$acr\n"            \
 472                 "6:     move.b $acr,[%0+]\n",           \
 473                 "7:     addq 1,%2\n",                   \
 474                 "       .dword 6b,7b\n")
 475
 476 #define __asm_copy_to_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 477         __asm_copy_to_user_8x_cont(to, from, ret,       \
 478                         COPY                            \
 479                 "       move.w [%1+],$acr\n"            \
 480                 "6:     move.w $acr,[%0+]\n",           \
 481                         FIXUP                           \
 482                 "7:     addq 2,%2\n",                   \
 483                         TENTRY                          \
 484                 "       .dword 6b,7b\n")
 485
 486 #define __asm_copy_to_user_10(to, from, ret) \
 487         __asm_copy_to_user_10x_cont(to, from, ret, "", "", "")
 488
 489 #define __asm_copy_to_user_11(to, from, ret) \
 490         __asm_copy_to_user_10x_cont(to, from, ret,      \
 491                 "       move.b [%1+],$acr\n"            \
 492                 "8:     move.b $acr,[%0+]\n",           \
 493                 "9:     addq 1,%2\n",                   \
 494                 "       .dword 8b,9b\n")
 495
 496 #define __asm_copy_to_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 497         __asm_copy_to_user_8x_cont(to, from, ret,       \
 498                         COPY                            \
 499                 "       move.d [%1+],$acr\n"            \
 500                 "6:     move.d $acr,[%0+]\n",           \
 501                         FIXUP                           \
 502                 "7:     addq 4,%2\n",                   \
 503                         TENTRY                          \
 504                 "       .dword 6b,7b\n")
 505
 506 #define __asm_copy_to_user_12(to, from, ret) \
 507         __asm_copy_to_user_12x_cont(to, from, ret, "", "", "")
 508
 509 #define __asm_copy_to_user_13(to, from, ret) \
 510         __asm_copy_to_user_12x_cont(to, from, ret,      \
 511                 "       move.b [%1+],$acr\n"            \
 512                 "8:     move.b $acr,[%0+]\n",           \
 513                 "9:     addq 1,%2\n",                   \
 514                 "       .dword 8b,9b\n")
 515
 516 #define __asm_copy_to_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 517         __asm_copy_to_user_12x_cont(to, from, ret,      \
 518                         COPY                            \
 519                 "       move.w [%1+],$acr\n"            \
 520                 "8:     move.w $acr,[%0+]\n",           \
 521                         FIXUP                           \
 522                 "9:     addq 2,%2\n",                   \
 523                         TENTRY                          \
 524                 "       .dword 8b,9b\n")
 525
 526 #define __asm_copy_to_user_14(to, from, ret)    \
 527         __asm_copy_to_user_14x_cont(to, from, ret, "", "", "")
 528
 529 #define __asm_copy_to_user_15(to, from, ret) \
 530         __asm_copy_to_user_14x_cont(to, from, ret,      \
 531                 "       move.b [%1+],$acr\n"            \
 532                 "10:    move.b $acr,[%0+]\n",           \
 533                 "11:    addq 1,%2\n",                   \
 534                 "       .dword 10b,11b\n")
 535
 536 #define __asm_copy_to_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 537         __asm_copy_to_user_12x_cont(to, from, ret,      \
 538                         COPY                            \
 539                 "       move.d [%1+],$acr\n"            \
 540                 "8:     move.d $acr,[%0+]\n",           \
 541                         FIXUP                           \
 542                 "9:     addq 4,%2\n",                   \
 543                         TENTRY                          \
 544                 "       .dword 8b,9b\n")
 545
 546 #define __asm_copy_to_user_16(to, from, ret) \
 547         __asm_copy_to_user_16x_cont(to, from, ret, "", "", "")
 548
 549 #define __asm_copy_to_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 550         __asm_copy_to_user_16x_cont(to, from, ret,      \
 551                         COPY                            \
 552                 "       move.d [%1+],$acr\n"            \
 553                 "10:    move.d $acr,[%0+]\n",           \
 554                         FIXUP                           \
 555                 "11:    addq 4,%2\n",                   \
 556                         TENTRY                          \
 557                 "       .dword 10b,11b\n")
 558
 559 #define __asm_copy_to_user_20(to, from, ret) \
 560         __asm_copy_to_user_20x_cont(to, from, ret, "", "", "")
 561
 562 #define __asm_copy_to_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 563         __asm_copy_to_user_20x_cont(to, from, ret,      \
 564                         COPY                            \
 565                 "       move.d [%1+],$acr\n"            \
 566                 "12:    move.d $acr,[%0+]\n",           \
 567                         FIXUP                           \
 568                 "13:    addq 4,%2\n",                   \
 569                         TENTRY                          \
 570                 "       .dword 12b,13b\n")
 571
 572 #define __asm_copy_to_user_24(to, from, ret)    \
 573         __asm_copy_to_user_24x_cont(to, from, ret, "", "", "")
 574
 575 /* Define a few clearing asms with exception handlers.  */
 576
 577 /* This frame-asm is like the __asm_copy_user_cont one, but has one less
 578    input.  */
 579
 580 #define __asm_clear(to, ret, CLEAR, FIXUP, TENTRY) \
 581         __asm__ __volatile__ (                          \
 582                         CLEAR                           \
 583                 "1:\n"                                  \
 584                 "       .section .fixup,\"ax\"\n"       \
 585                         FIXUP                           \
 586                 "       .previous\n"                    \
 587                 "       .section __ex_table,\"a\"\n"    \
 588                         TENTRY                          \
 589                 "       .previous"                      \
 590                 : "=b" (to), "=r" (ret)                 \
 591                 : "0" (to), "1" (ret)                   \
 592                 : "memory")
 593
 594 #define __asm_clear_1(to, ret) \
 595         __asm_clear(to, ret,                    \
 596                 "2:     clear.b [%0+]\n",       \
 597                 "3:     jump 1b\n"              \
 598                 "       addq 1,%1\n",           \
 599                 "       .dword 2b,3b\n")
 600
 601 #define __asm_clear_2(to, ret) \
 602         __asm_clear(to, ret,                    \
 603                 "2:     clear.w [%0+]\n",       \
 604                 "3:     jump 1b\n"              \
 605                 "       addq 2,%1\n",           \
 606                 "       .dword 2b,3b\n")
 607
 608 #define __asm_clear_3(to, ret) \
 609      __asm_clear(to, ret,                       \
 610                  "2:    clear.w [%0+]\n"        \
 611                  "3:    clear.b [%0+]\n",       \
 612                  "4:    addq 2,%1\n"            \
 613                  "5:    jump 1b\n"              \
 614                  "      addq 1,%1\n",           \
 615                  "      .dword 2b,4b\n"         \
 616                  "      .dword 3b,5b\n")
 617
 618 #define __asm_clear_4x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 619         __asm_clear(to, ret,                            \
 620                         CLEAR                           \
 621                 "2:     clear.d [%0+]\n",               \
 622                         FIXUP                           \
 623                 "3:     jump 1b\n"                      \
 624                 "       addq 4,%1\n",                   \
 625                         TENTRY                          \
 626                 "       .dword 2b,3b\n")
 627
 628 #define __asm_clear_4(to, ret) \
 629         __asm_clear_4x_cont(to, ret, "", "", "")
 630
 631 #define __asm_clear_8x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 632         __asm_clear_4x_cont(to, ret,                    \
 633                         CLEAR                           \
 634                 "4:     clear.d [%0+]\n",               \
 635                         FIXUP                           \
 636                 "5:     addq 4,%1\n",                   \
 637                         TENTRY                          \
 638                 "       .dword 4b,5b\n")
 639
 640 #define __asm_clear_8(to, ret) \
 641         __asm_clear_8x_cont(to, ret, "", "", "")
 642
 643 #define __asm_clear_12x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 644         __asm_clear_8x_cont(to, ret,                    \
 645                         CLEAR                           \
 646                 "6:     clear.d [%0+]\n",               \
 647                         FIXUP                           \
 648                 "7:     addq 4,%1\n",                   \
 649                         TENTRY                          \
 650                 "       .dword 6b,7b\n")
 651
 652 #define __asm_clear_12(to, ret) \
 653         __asm_clear_12x_cont(to, ret, "", "", "")
 654
 655 #define __asm_clear_16x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 656         __asm_clear_12x_cont(to, ret,                   \
 657                         CLEAR                           \
 658                 "8:     clear.d [%0+]\n",               \
 659                         FIXUP                           \
 660                 "9:     addq 4,%1\n",                   \
 661                         TENTRY                          \
 662                 "       .dword 8b,9b\n")
 663
 664 #define __asm_clear_16(to, ret) \
 665         __asm_clear_16x_cont(to, ret, "", "", "")
 666
 667 #define __asm_clear_20x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 668         __asm_clear_16x_cont(to, ret,                   \
 669                         CLEAR                           \
 670                 "10:    clear.d [%0+]\n",               \
 671                         FIXUP                           \
 672                 "11:    addq 4,%1\n",                   \
 673                         TENTRY                          \
 674                 "       .dword 10b,11b\n")
 675
 676 #define __asm_clear_20(to, ret) \
 677         __asm_clear_20x_cont(to, ret, "", "", "")
 678
 679 #define __asm_clear_24x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 680         __asm_clear_20x_cont(to, ret,                   \
 681                         CLEAR                           \
 682                 "12:    clear.d [%0+]\n",               \
 683                         FIXUP                           \
 684                 "13:    addq 4,%1\n",                   \
 685                         TENTRY                          \
 686                 "       .dword 12b,13b\n")
 687
 688 #define __asm_clear_24(to, ret) \
 689         __asm_clear_24x_cont(to, ret, "", "", "")
 690
 691 /*
 692  * Return the size of a string (including the ending 0)
 693  *
 694  * Return length of string in userspace including terminating 0
 695  * or 0 for error.  Return a value greater than N if too long.
 696  */
 697
 698 extern inline long
 699 strnlen_user(const char *s, long n)
 700 {
 701         long res, tmp1;
 702
 703         if (!access_ok(VERIFY_READ, s, 0))
 704                 return 0;
 705
 706         /*
 707          * This code is deduced from:
 708          *
 709          *      tmp1 = n;
 710          *      while (tmp1-- > 0 && *s++)
 711          *        ;
 712          *
 713          *      res = n - tmp1;
 714          *
 715          *  (with tweaks).
 716          */
 717
 718         __asm__ __volatile__ (
 719                 "       move.d %1,$acr\n"
 720                 "       cmpq 0,$acr\n"
 721                 "0:\n"
 722                 "       ble 1f\n"
 723                 "       subq 1,$acr\n"
 724
 725                 "4:     test.b [%0+]\n"
 726                 "       bne 0b\n"
 727                 "       cmpq 0,$acr\n"
 728                 "1:\n"
 729                 "       move.d %1,%0\n"
 730                 "       sub.d $acr,%0\n"
 731                 "2:\n"
 732                 "       .section .fixup,\"ax\"\n"
 733
 734                 "3:     jump 2b\n"
 735                 "       clear.d %0\n"
 736
 737                 "       .previous\n"
 738                 "       .section __ex_table,\"a\"\n"
 739                 "       .dword 4b,3b\n"
 740                 "       .previous\n"
 741                 : "=r" (res), "=r" (tmp1)
 742                 : "0" (s), "1" (n)
 743                 : "acr");
 744
 745         return res;
 746 }
 747
 748 #endif