include/asm-cris/arch-v10/uaccess.h

   1 /*
   2  * Authors:    Bjorn Wesen (bjornw@axis.com)
   3  *             Hans-Peter Nilsson (hp@axis.com)
   4  *
   5  */
   6 #ifndef _CRIS_ARCH_UACCESS_H
   7 #define _CRIS_ARCH_UACCESS_H
   8
   9 /*
  10  * We don't tell gcc that we are accessing memory, but this is OK
  11  * because we do not write to any memory gcc knows about, so there
  12  * are no aliasing issues.
  13  *
  14  * Note that PC at a fault is the address *after* the faulting
  15  * instruction.
  16  */
  17 #define __put_user_asm(x, addr, err, op)                        \
  18         __asm__ __volatile__(                                   \
  19                 "       "op" %1,[%2]\n"                         \
  20                 "2:\n"                                          \
  21                 "       .section .fixup,\"ax\"\n"               \
  22                 "3:     move.d %3,%0\n"                         \
  23                 "       jump 2b\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)                         \
  32         __asm__ __volatile__(                                   \
  33                 "       move.d %M1,[%2]\n"                      \
  34                 "2:     move.d %H1,[%2+4]\n"                    \
  35                 "4:\n"                                          \
  36                 "       .section .fixup,\"ax\"\n"               \
  37                 "3:     move.d %3,%0\n"                         \
  38                 "       jump 4b\n"                              \
  39                 "       .previous\n"                            \
  40                 "       .section __ex_table,\"a\"\n"            \
  41                 "       .dword 2b,3b\n"                         \
  42                 "       .dword 4b,3b\n"                         \
  43                 "       .previous\n"                            \
  44                 : "=r" (err)                                    \
  45                 : "r" (x), "r" (addr), "g" (-EFAULT), "0" (err))
  46
  47 /* See comment before __put_user_asm.  */
  48
  49 #define __get_user_asm(x, addr, err, op)                \
  50         __asm__ __volatile__(                           \
  51                 "       "op" [%2],%1\n"                 \
  52                 "2:\n"                                  \
  53                 "       .section .fixup,\"ax\"\n"       \
  54                 "3:     move.d %3,%0\n"                 \
  55                 "       moveq 0,%1\n"                   \
  56                 "       jump 2b\n"                      \
  57                 "       .previous\n"                    \
  58                 "       .section __ex_table,\"a\"\n"    \
  59                 "       .dword 2b,3b\n"                 \
  60                 "       .previous\n"                    \
  61                 : "=r" (err), "=r" (x)                  \
  62                 : "r" (addr), "g" (-EFAULT), "0" (err))
  63
  64 #define __get_user_asm_64(x, addr, err)                 \
  65         __asm__ __volatile__(                           \
  66                 "       move.d [%2],%M1\n"              \
  67                 "2:     move.d [%2+4],%H1\n"            \
  68                 "4:\n"                                  \
  69                 "       .section .fixup,\"ax\"\n"       \
  70                 "3:     move.d %3,%0\n"                 \
  71                 "       moveq 0,%1\n"                   \
  72                 "       jump 4b\n"                      \
  73                 "       .previous\n"                    \
  74                 "       .section __ex_table,\"a\"\n"    \
  75                 "       .dword 2b,3b\n"                 \
  76                 "       .dword 4b,3b\n"                 \
  77                 "       .previous\n"                    \
  78                 : "=r" (err), "=r" (x)                  \
  79                 : "r" (addr), "g" (-EFAULT), "0" (err))
  80
  81 /*
  82  * Copy a null terminated string from userspace.
  83  *
  84  * Must return:
  85  * -EFAULT              for an exception
  86  * count                if we hit the buffer limit
  87  * bytes copied         if we hit a null byte
  88  * (without the null byte)
  89  */
  90 static inline long
  91 __do_strncpy_from_user(char *dst, const char *src, long count)
  92 {
  93         long res;
  94
  95         if (count == 0)
  96                 return 0;
  97
  98         /*
  99          * Currently, in 2.4.0-test9, most ports use a simple byte-copy loop.
 100          *  So do we.
 101          *
 102          *  This code is deduced from:
 103          *
 104          *      char tmp2;
 105          *      long tmp1, tmp3
 106          *      tmp1 = count;
 107          *      while ((*dst++ = (tmp2 = *src++)) != 0
 108          *             && --tmp1)
 109          *        ;
 110          *
 111          *      res = count - tmp1;
 112          *
 113          *  with tweaks.
 114          */
 115
 116         __asm__ __volatile__ (
 117                 "       move.d %3,%0\n"
 118                 "       move.b [%2+],$r9\n"
 119                 "1:     beq 2f\n"
 120                 "       move.b $r9,[%1+]\n"
 121
 122                 "       subq 1,%0\n"
 123                 "       bne 1b\n"
 124                 "       move.b [%2+],$r9\n"
 125
 126                 "2:     sub.d %3,%0\n"
 127                 "       neg.d %0,%0\n"
 128                 "3:\n"
 129                 "       .section .fixup,\"ax\"\n"
 130                 "4:     move.d %7,%0\n"
 131                 "       jump 3b\n"
 132
 133                 /* There's one address for a fault at the first move, and
 134                    two possible PC values for a fault at the second move,
 135                    being a delay-slot filler.  However, the branch-target
 136                    for the second move is the same as the first address.
 137                    Just so you don't get confused...  */
 138                 "       .previous\n"
 139                 "       .section __ex_table,\"a\"\n"
 140                 "       .dword 1b,4b\n"
 141                 "       .dword 2b,4b\n"
 142                 "       .previous"
 143                 : "=r" (res), "=r" (dst), "=r" (src), "=r" (count)
 144                 : "3" (count), "1" (dst), "2" (src), "g" (-EFAULT)
 145                 : "r9");
 146
 147         return res;
 148 }
 149
 150 /* A few copy asms to build up the more complex ones from.
 151
 152    Note again, a post-increment is performed regardless of whether a bus
 153    fault occurred in that instruction, and PC for a faulted insn is the
 154    address *after* the insn.  */
 155
 156 #define __asm_copy_user_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 157         __asm__ __volatile__ (                          \
 158                         COPY                            \
 159                 "1:\n"                                  \
 160                 "       .section .fixup,\"ax\"\n"       \
 161                         FIXUP                           \
 162                 "       jump 1b\n"                      \
 163                 "       .previous\n"                    \
 164                 "       .section __ex_table,\"a\"\n"    \
 165                         TENTRY                          \
 166                 "       .previous\n"                    \
 167                 : "=r" (to), "=r" (from), "=r" (ret)    \
 168                 : "0" (to), "1" (from), "2" (ret)       \
 169                 : "r9", "memory")
 170
 171 #define __asm_copy_from_user_1(to, from, ret) \
 172         __asm_copy_user_cont(to, from, ret,     \
 173                 "       move.b [%1+],$r9\n"     \
 174                 "2:     move.b $r9,[%0+]\n",    \
 175                 "3:     addq 1,%2\n"            \
 176                 "       clear.b [%0+]\n",       \
 177                 "       .dword 2b,3b\n")
 178
 179 #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 180         __asm_copy_user_cont(to, from, ret,             \
 181                 "       move.w [%1+],$r9\n"             \
 182                 "2:     move.w $r9,[%0+]\n" COPY,       \
 183                 "3:     addq 2,%2\n"                    \
 184                 "       clear.w [%0+]\n" FIXUP,         \
 185                 "       .dword 2b,3b\n" TENTRY)
 186
 187 #define __asm_copy_from_user_2(to, from, ret) \
 188         __asm_copy_from_user_2x_cont(to, from, ret, "", "", "")
 189
 190 #define __asm_copy_from_user_3(to, from, ret)           \
 191         __asm_copy_from_user_2x_cont(to, from, ret,     \
 192                 "       move.b [%1+],$r9\n"             \
 193                 "4:     move.b $r9,[%0+]\n",            \
 194                 "5:     addq 1,%2\n"                    \
 195                 "       clear.b [%0+]\n",               \
 196                 "       .dword 4b,5b\n")
 197
 198 #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 199         __asm_copy_user_cont(to, from, ret,             \
 200                 "       move.d [%1+],$r9\n"             \
 201                 "2:     move.d $r9,[%0+]\n" COPY,       \
 202                 "3:     addq 4,%2\n"                    \
 203                 "       clear.d [%0+]\n" FIXUP,         \
 204                 "       .dword 2b,3b\n" TENTRY)
 205
 206 #define __asm_copy_from_user_4(to, from, ret) \
 207         __asm_copy_from_user_4x_cont(to, from, ret, "", "", "")
 208
 209 #define __asm_copy_from_user_5(to, from, ret) \
 210         __asm_copy_from_user_4x_cont(to, from, ret,     \
 211                 "       move.b [%1+],$r9\n"             \
 212                 "4:     move.b $r9,[%0+]\n",            \
 213                 "5:     addq 1,%2\n"                    \
 214                 "       clear.b [%0+]\n",               \
 215                 "       .dword 4b,5b\n")
 216
 217 #define __asm_copy_from_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 218         __asm_copy_from_user_4x_cont(to, from, ret,     \
 219                 "       move.w [%1+],$r9\n"             \
 220                 "4:     move.w $r9,[%0+]\n" COPY,       \
 221                 "5:     addq 2,%2\n"                    \
 222                 "       clear.w [%0+]\n" FIXUP,         \
 223                 "       .dword 4b,5b\n" TENTRY)
 224
 225 #define __asm_copy_from_user_6(to, from, ret) \
 226         __asm_copy_from_user_6x_cont(to, from, ret, "", "", "")
 227
 228 #define __asm_copy_from_user_7(to, from, ret) \
 229         __asm_copy_from_user_6x_cont(to, from, ret,     \
 230                 "       move.b [%1+],$r9\n"             \
 231                 "6:     move.b $r9,[%0+]\n",            \
 232                 "7:     addq 1,%2\n"                    \
 233                 "       clear.b [%0+]\n",               \
 234                 "       .dword 6b,7b\n")
 235
 236 #define __asm_copy_from_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 237         __asm_copy_from_user_4x_cont(to, from, ret,     \
 238                 "       move.d [%1+],$r9\n"             \
 239                 "4:     move.d $r9,[%0+]\n" COPY,       \
 240                 "5:     addq 4,%2\n"                    \
 241                 "       clear.d [%0+]\n" FIXUP,         \
 242                 "       .dword 4b,5b\n" TENTRY)
 243
 244 #define __asm_copy_from_user_8(to, from, ret) \
 245         __asm_copy_from_user_8x_cont(to, from, ret, "", "", "")
 246
 247 #define __asm_copy_from_user_9(to, from, ret) \
 248         __asm_copy_from_user_8x_cont(to, from, ret,     \
 249                 "       move.b [%1+],$r9\n"             \
 250                 "6:     move.b $r9,[%0+]\n",            \
 251                 "7:     addq 1,%2\n"                    \
 252                 "       clear.b [%0+]\n",               \
 253                 "       .dword 6b,7b\n")
 254
 255 #define __asm_copy_from_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 256         __asm_copy_from_user_8x_cont(to, from, ret,     \
 257                 "       move.w [%1+],$r9\n"             \
 258                 "6:     move.w $r9,[%0+]\n" COPY,       \
 259                 "7:     addq 2,%2\n"                    \
 260                 "       clear.w [%0+]\n" FIXUP,         \
 261                 "       .dword 6b,7b\n" TENTRY)
 262
 263 #define __asm_copy_from_user_10(to, from, ret) \
 264         __asm_copy_from_user_10x_cont(to, from, ret, "", "", "")
 265
 266 #define __asm_copy_from_user_11(to, from, ret)          \
 267         __asm_copy_from_user_10x_cont(to, from, ret,    \
 268                 "       move.b [%1+],$r9\n"             \
 269                 "8:     move.b $r9,[%0+]\n",            \
 270                 "9:     addq 1,%2\n"                    \
 271                 "       clear.b [%0+]\n",               \
 272                 "       .dword 8b,9b\n")
 273
 274 #define __asm_copy_from_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 275         __asm_copy_from_user_8x_cont(to, from, ret,     \
 276                 "       move.d [%1+],$r9\n"             \
 277                 "6:     move.d $r9,[%0+]\n" COPY,       \
 278                 "7:     addq 4,%2\n"                    \
 279                 "       clear.d [%0+]\n" FIXUP,         \
 280                 "       .dword 6b,7b\n" TENTRY)
 281
 282 #define __asm_copy_from_user_12(to, from, ret) \
 283         __asm_copy_from_user_12x_cont(to, from, ret, "", "", "")
 284
 285 #define __asm_copy_from_user_13(to, from, ret) \
 286         __asm_copy_from_user_12x_cont(to, from, ret,    \
 287                 "       move.b [%1+],$r9\n"             \
 288                 "8:     move.b $r9,[%0+]\n",            \
 289                 "9:     addq 1,%2\n"                    \
 290                 "       clear.b [%0+]\n",               \
 291                 "       .dword 8b,9b\n")
 292
 293 #define __asm_copy_from_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 294         __asm_copy_from_user_12x_cont(to, from, ret,    \
 295                 "       move.w [%1+],$r9\n"             \
 296                 "8:     move.w $r9,[%0+]\n" COPY,       \
 297                 "9:     addq 2,%2\n"                    \
 298                 "       clear.w [%0+]\n" FIXUP,         \
 299                 "       .dword 8b,9b\n" TENTRY)
 300
 301 #define __asm_copy_from_user_14(to, from, ret) \
 302         __asm_copy_from_user_14x_cont(to, from, ret, "", "", "")
 303
 304 #define __asm_copy_from_user_15(to, from, ret) \
 305         __asm_copy_from_user_14x_cont(to, from, ret,    \
 306                 "       move.b [%1+],$r9\n"             \
 307                 "10:    move.b $r9,[%0+]\n",            \
 308                 "11:    addq 1,%2\n"                    \
 309                 "       clear.b [%0+]\n",               \
 310                 "       .dword 10b,11b\n")
 311
 312 #define __asm_copy_from_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 313         __asm_copy_from_user_12x_cont(to, from, ret,    \
 314                 "       move.d [%1+],$r9\n"             \
 315                 "8:     move.d $r9,[%0+]\n" COPY,       \
 316                 "9:     addq 4,%2\n"                    \
 317                 "       clear.d [%0+]\n" FIXUP,         \
 318                 "       .dword 8b,9b\n" TENTRY)
 319
 320 #define __asm_copy_from_user_16(to, from, ret) \
 321         __asm_copy_from_user_16x_cont(to, from, ret, "", "", "")
 322
 323 #define __asm_copy_from_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 324         __asm_copy_from_user_16x_cont(to, from, ret,    \
 325                 "       move.d [%1+],$r9\n"             \
 326                 "10:    move.d $r9,[%0+]\n" COPY,       \
 327                 "11:    addq 4,%2\n"                    \
 328                 "       clear.d [%0+]\n" FIXUP,         \
 329                 "       .dword 10b,11b\n" TENTRY)
 330
 331 #define __asm_copy_from_user_20(to, from, ret) \
 332         __asm_copy_from_user_20x_cont(to, from, ret, "", "", "")
 333
 334 #define __asm_copy_from_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 335         __asm_copy_from_user_20x_cont(to, from, ret,    \
 336                 "       move.d [%1+],$r9\n"             \
 337                 "12:    move.d $r9,[%0+]\n" COPY,       \
 338                 "13:    addq 4,%2\n"                    \
 339                 "       clear.d [%0+]\n" FIXUP,         \
 340                 "       .dword 12b,13b\n" TENTRY)
 341
 342 #define __asm_copy_from_user_24(to, from, ret) \
 343         __asm_copy_from_user_24x_cont(to, from, ret, "", "", "")
 344
 345 /* And now, the to-user ones.  */
 346
 347 #define __asm_copy_to_user_1(to, from, ret)     \
 348         __asm_copy_user_cont(to, from, ret,     \
 349                 "       move.b [%1+],$r9\n"     \
 350                 "       move.b $r9,[%0+]\n2:\n",        \
 351                 "3:     addq 1,%2\n",           \
 352                 "       .dword 2b,3b\n")
 353
 354 #define __asm_copy_to_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 355         __asm_copy_user_cont(to, from, ret,             \
 356                 "       move.w [%1+],$r9\n"             \
 357                 "       move.w $r9,[%0+]\n2:\n" COPY,   \
 358                 "3:     addq 2,%2\n" FIXUP,             \
 359                 "       .dword 2b,3b\n" TENTRY)
 360
 361 #define __asm_copy_to_user_2(to, from, ret) \
 362         __asm_copy_to_user_2x_cont(to, from, ret, "", "", "")
 363
 364 #define __asm_copy_to_user_3(to, from, ret) \
 365         __asm_copy_to_user_2x_cont(to, from, ret,       \
 366                 "       move.b [%1+],$r9\n"             \
 367                 "       move.b $r9,[%0+]\n4:\n",                \
 368                 "5:     addq 1,%2\n",                   \
 369                 "       .dword 4b,5b\n")
 370
 371 #define __asm_copy_to_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 372         __asm_copy_user_cont(to, from, ret,             \
 373                 "       move.d [%1+],$r9\n"             \
 374                 "       move.d $r9,[%0+]\n2:\n" COPY,   \
 375                 "3:     addq 4,%2\n" FIXUP,             \
 376                 "       .dword 2b,3b\n" TENTRY)
 377
 378 #define __asm_copy_to_user_4(to, from, ret) \
 379         __asm_copy_to_user_4x_cont(to, from, ret, "", "", "")
 380
 381 #define __asm_copy_to_user_5(to, from, ret) \
 382         __asm_copy_to_user_4x_cont(to, from, ret,       \
 383                 "       move.b [%1+],$r9\n"             \
 384                 "       move.b $r9,[%0+]\n4:\n",                \
 385                 "5:     addq 1,%2\n",                   \
 386                 "       .dword 4b,5b\n")
 387
 388 #define __asm_copy_to_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 389         __asm_copy_to_user_4x_cont(to, from, ret,       \
 390                 "       move.w [%1+],$r9\n"             \
 391                 "       move.w $r9,[%0+]\n4:\n" COPY,   \
 392                 "5:     addq 2,%2\n" FIXUP,             \
 393                 "       .dword 4b,5b\n" TENTRY)
 394
 395 #define __asm_copy_to_user_6(to, from, ret) \
 396         __asm_copy_to_user_6x_cont(to, from, ret, "", "", "")
 397
 398 #define __asm_copy_to_user_7(to, from, ret) \
 399         __asm_copy_to_user_6x_cont(to, from, ret,       \
 400                 "       move.b [%1+],$r9\n"             \
 401                 "       move.b $r9,[%0+]\n6:\n",                \
 402                 "7:     addq 1,%2\n",                   \
 403                 "       .dword 6b,7b\n")
 404
 405 #define __asm_copy_to_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 406         __asm_copy_to_user_4x_cont(to, from, ret,       \
 407                 "       move.d [%1+],$r9\n"             \
 408                 "       move.d $r9,[%0+]\n4:\n" COPY,   \
 409                 "5:     addq 4,%2\n"  FIXUP,            \
 410                 "       .dword 4b,5b\n" TENTRY)
 411
 412 #define __asm_copy_to_user_8(to, from, ret) \
 413         __asm_copy_to_user_8x_cont(to, from, ret, "", "", "")
 414
 415 #define __asm_copy_to_user_9(to, from, ret) \
 416         __asm_copy_to_user_8x_cont(to, from, ret,       \
 417                 "       move.b [%1+],$r9\n"             \
 418                 "       move.b $r9,[%0+]\n6:\n",                \
 419                 "7:     addq 1,%2\n",                   \
 420                 "       .dword 6b,7b\n")
 421
 422 #define __asm_copy_to_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 423         __asm_copy_to_user_8x_cont(to, from, ret,       \
 424                 "       move.w [%1+],$r9\n"             \
 425                 "       move.w $r9,[%0+]\n6:\n" COPY,   \
 426                 "7:     addq 2,%2\n" FIXUP,             \
 427                 "       .dword 6b,7b\n" TENTRY)
 428
 429 #define __asm_copy_to_user_10(to, from, ret) \
 430         __asm_copy_to_user_10x_cont(to, from, ret, "", "", "")
 431
 432 #define __asm_copy_to_user_11(to, from, ret) \
 433         __asm_copy_to_user_10x_cont(to, from, ret,      \
 434                 "       move.b [%1+],$r9\n"             \
 435                 "       move.b $r9,[%0+]\n8:\n",                \
 436                 "9:     addq 1,%2\n",                   \
 437                 "       .dword 8b,9b\n")
 438
 439 #define __asm_copy_to_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 440         __asm_copy_to_user_8x_cont(to, from, ret,       \
 441                 "       move.d [%1+],$r9\n"             \
 442                 "       move.d $r9,[%0+]\n6:\n" COPY,   \
 443                 "7:     addq 4,%2\n" FIXUP,             \
 444                 "       .dword 6b,7b\n" TENTRY)
 445
 446 #define __asm_copy_to_user_12(to, from, ret) \
 447         __asm_copy_to_user_12x_cont(to, from, ret, "", "", "")
 448
 449 #define __asm_copy_to_user_13(to, from, ret) \
 450         __asm_copy_to_user_12x_cont(to, from, ret,      \
 451                 "       move.b [%1+],$r9\n"             \
 452                 "       move.b $r9,[%0+]\n8:\n",                \
 453                 "9:     addq 1,%2\n",                   \
 454                 "       .dword 8b,9b\n")
 455
 456 #define __asm_copy_to_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 457         __asm_copy_to_user_12x_cont(to, from, ret,      \
 458                 "       move.w [%1+],$r9\n"             \
 459                 "       move.w $r9,[%0+]\n8:\n" COPY,   \
 460                 "9:     addq 2,%2\n" FIXUP,             \
 461                 "       .dword 8b,9b\n" TENTRY)
 462
 463 #define __asm_copy_to_user_14(to, from, ret)    \
 464         __asm_copy_to_user_14x_cont(to, from, ret, "", "", "")
 465
 466 #define __asm_copy_to_user_15(to, from, ret) \
 467         __asm_copy_to_user_14x_cont(to, from, ret,      \
 468                 "       move.b [%1+],$r9\n"             \
 469                 "       move.b $r9,[%0+]\n10:\n",               \
 470                 "11:    addq 1,%2\n",                   \
 471                 "       .dword 10b,11b\n")
 472
 473 #define __asm_copy_to_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 474         __asm_copy_to_user_12x_cont(to, from, ret,      \
 475                 "       move.d [%1+],$r9\n"             \
 476                 "       move.d $r9,[%0+]\n8:\n" COPY,   \
 477                 "9:     addq 4,%2\n" FIXUP,             \
 478                 "       .dword 8b,9b\n" TENTRY)
 479
 480 #define __asm_copy_to_user_16(to, from, ret) \
 481         __asm_copy_to_user_16x_cont(to, from, ret, "", "", "")
 482
 483 #define __asm_copy_to_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 484         __asm_copy_to_user_16x_cont(to, from, ret,      \
 485                 "       move.d [%1+],$r9\n"             \
 486                 "       move.d $r9,[%0+]\n10:\n" COPY,  \
 487                 "11:    addq 4,%2\n" FIXUP,             \
 488                 "       .dword 10b,11b\n" TENTRY)
 489
 490 #define __asm_copy_to_user_20(to, from, ret) \
 491         __asm_copy_to_user_20x_cont(to, from, ret, "", "", "")
 492
 493 #define __asm_copy_to_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 494         __asm_copy_to_user_20x_cont(to, from, ret,      \
 495                 "       move.d [%1+],$r9\n"             \
 496                 "       move.d $r9,[%0+]\n12:\n" COPY,  \
 497                 "13:    addq 4,%2\n" FIXUP,             \
 498                 "       .dword 12b,13b\n" TENTRY)
 499
 500 #define __asm_copy_to_user_24(to, from, ret)    \
 501         __asm_copy_to_user_24x_cont(to, from, ret, "", "", "")
 502
 503 /* Define a few clearing asms with exception handlers.  */
 504
 505 /* This frame-asm is like the __asm_copy_user_cont one, but has one less
 506    input.  */
 507
 508 #define __asm_clear(to, ret, CLEAR, FIXUP, TENTRY) \
 509         __asm__ __volatile__ (                          \
 510                         CLEAR                           \
 511                 "1:\n"                                  \
 512                 "       .section .fixup,\"ax\"\n"       \
 513                         FIXUP                           \
 514                 "       jump 1b\n"                      \
 515                 "       .previous\n"                    \
 516                 "       .section __ex_table,\"a\"\n"    \
 517                         TENTRY                          \
 518                 "       .previous"                      \
 519                 : "=r" (to), "=r" (ret)                 \
 520                 : "0" (to), "1" (ret)                   \
 521                 : "memory")
 522
 523 #define __asm_clear_1(to, ret) \
 524         __asm_clear(to, ret,                    \
 525                 "       clear.b [%0+]\n2:\n",   \
 526                 "3:     addq 1,%1\n",           \
 527                 "       .dword 2b,3b\n")
 528
 529 #define __asm_clear_2(to, ret) \
 530         __asm_clear(to, ret,                    \
 531                 "       clear.w [%0+]\n2:\n",   \
 532                 "3:     addq 2,%1\n",           \
 533                 "       .dword 2b,3b\n")
 534
 535 #define __asm_clear_3(to, ret) \
 536      __asm_clear(to, ret,                       \
 537                  "      clear.w [%0+]\n"        \
 538                  "2:    clear.b [%0+]\n3:\n",   \
 539                  "4:    addq 2,%1\n"            \
 540                  "5:    addq 1,%1\n",           \
 541                  "      .dword 2b,4b\n"         \
 542                  "      .dword 3b,5b\n")
 543
 544 #define __asm_clear_4x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 545         __asm_clear(to, ret,                            \
 546                 "       clear.d [%0+]\n2:\n" CLEAR,     \
 547                 "3:     addq 4,%1\n" FIXUP,             \
 548                 "       .dword 2b,3b\n" TENTRY)
 549
 550 #define __asm_clear_4(to, ret) \
 551         __asm_clear_4x_cont(to, ret, "", "", "")
 552
 553 #define __asm_clear_8x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 554         __asm_clear_4x_cont(to, ret,                    \
 555                 "       clear.d [%0+]\n4:\n" CLEAR,     \
 556                 "5:     addq 4,%1\n" FIXUP,             \
 557                 "       .dword 4b,5b\n" TENTRY)
 558
 559 #define __asm_clear_8(to, ret) \
 560         __asm_clear_8x_cont(to, ret, "", "", "")
 561
 562 #define __asm_clear_12x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 563         __asm_clear_8x_cont(to, ret,                    \
 564                 "       clear.d [%0+]\n6:\n" CLEAR,     \
 565                 "7:     addq 4,%1\n" FIXUP,             \
 566                 "       .dword 6b,7b\n" TENTRY)
 567
 568 #define __asm_clear_12(to, ret) \
 569         __asm_clear_12x_cont(to, ret, "", "", "")
 570
 571 #define __asm_clear_16x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 572         __asm_clear_12x_cont(to, ret,                   \
 573                 "       clear.d [%0+]\n8:\n" CLEAR,     \
 574                 "9:     addq 4,%1\n" FIXUP,             \
 575                 "       .dword 8b,9b\n" TENTRY)
 576
 577 #define __asm_clear_16(to, ret) \
 578         __asm_clear_16x_cont(to, ret, "", "", "")
 579
 580 #define __asm_clear_20x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 581         __asm_clear_16x_cont(to, ret,                   \
 582                 "       clear.d [%0+]\n10:\n" CLEAR,    \
 583                 "11:    addq 4,%1\n" FIXUP,             \
 584                 "       .dword 10b,11b\n" TENTRY)
 585
 586 #define __asm_clear_20(to, ret) \
 587         __asm_clear_20x_cont(to, ret, "", "", "")
 588
 589 #define __asm_clear_24x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 590         __asm_clear_20x_cont(to, ret,                   \
 591                 "       clear.d [%0+]\n12:\n" CLEAR,    \
 592                 "13:    addq 4,%1\n" FIXUP,             \
 593                 "       .dword 12b,13b\n" TENTRY)
 594
 595 #define __asm_clear_24(to, ret) \
 596         __asm_clear_24x_cont(to, ret, "", "", "")
 597
 598 /*
 599  * Return the size of a string (including the ending 0)
 600  *
 601  * Return length of string in userspace including terminating 0
 602  * or 0 for error.  Return a value greater than N if too long.
 603  */
 604
 605 static inline long
 606 strnlen_user(const char *s, long n)
 607 {
 608         long res, tmp1;
 609
 610         if (!access_ok(VERIFY_READ, s, 0))
 611                 return 0;
 612
 613         /*
 614          * This code is deduced from:
 615          *
 616          *      tmp1 = n;
 617          *      while (tmp1-- > 0 && *s++)
 618          *        ;
 619          *
 620          *      res = n - tmp1;
 621          *
 622          *  (with tweaks).
 623          */
 624
 625         __asm__ __volatile__ (
 626                 "       move.d %1,$r9\n"
 627                 "0:\n"
 628                 "       ble 1f\n"
 629                 "       subq 1,$r9\n"
 630
 631                 "       test.b [%0+]\n"
 632                 "       bne 0b\n"
 633                 "       test.d $r9\n"
 634                 "1:\n"
 635                 "       move.d %1,%0\n"
 636                 "       sub.d $r9,%0\n"
 637                 "2:\n"
 638                 "       .section .fixup,\"ax\"\n"
 639
 640                 "3:     clear.d %0\n"
 641                 "       jump 2b\n"
 642
 643                 /* There's one address for a fault at the first move, and
 644                    two possible PC values for a fault at the second move,
 645                    being a delay-slot filler.  However, the branch-target
 646                    for the second move is the same as the first address.
 647                    Just so you don't get confused...  */
 648                 "       .previous\n"
 649                 "       .section __ex_table,\"a\"\n"
 650                 "       .dword 0b,3b\n"
 651                 "       .dword 1b,3b\n"
 652                 "       .previous\n"
 653                 : "=r" (res), "=r" (tmp1)
 654                 : "0" (s), "1" (n)
 655                 : "r9");
 656
 657         return res;
 658 }
 659
 660 #endif