arch/metag/lib/usercopy.c

   1 /*
   2  * User address space access functions.
   3  * The non-inlined parts of asm-metag/uaccess.h are here.
   4  *
   5  * Copyright (C) 2006, Imagination Technologies.
   6  * Copyright (C) 2000, Axis Communications AB.
   7  *
   8  * Written by Hans-Peter Nilsson.
   9  * Pieces used from memcpy, originally by Kenny Ranerup long time ago.
  10  * Modified for Meta by Will Newton.
  11  */
  12
  13 #include <linux/export.h>
  14 #include <linux/uaccess.h>
  15 #include <asm/cache.h>                  /* def of L1_CACHE_BYTES */
  16
  17 #define USE_RAPF
  18 #define RAPF_MIN_BUF_SIZE       (3*L1_CACHE_BYTES)
  19
  20
  21 /* The "double write" in this code is because the Meta will not fault
  22  * immediately unless the memory pipe is forced to by e.g. a data stall or
  23  * another memory op. The second write should be discarded by the write
  24  * combiner so should have virtually no cost.
  25  */
  26
  27 #define __asm_copy_user_cont(to, from, ret, COPY, FIXUP, TENTRY) \
  28         asm volatile (                                           \
  29                 COPY                                             \
  30                 "1:\n"                                           \
  31                 "       .section .fixup,\"ax\"\n"                \
  32                 FIXUP                                            \
  33                 "       MOVT    D1Ar1,#HI(1b)\n"                 \
  34                 "       JUMP    D1Ar1,#LO(1b)\n"                 \
  35                 "       .previous\n"                             \
  36                 "       .section __ex_table,\"a\"\n"             \
  37                 TENTRY                                           \
  38                 "       .previous\n"                             \
  39                 : "=r" (to), "=r" (from), "=r" (ret)             \
  40                 : "0" (to), "1" (from), "2" (ret)                \
  41                 : "D1Ar1", "memory")
  42
  43
  44 #define __asm_copy_to_user_1(to, from, ret)     \
  45         __asm_copy_user_cont(to, from, ret,     \
  46                 "       GETB D1Ar1,[%1++]\n"    \
  47                 "       SETB [%0],D1Ar1\n"      \
  48                 "2:     SETB [%0++],D1Ar1\n",   \
  49                 "3:     ADD  %2,%2,#1\n",       \
  50                 "       .long 2b,3b\n")
  51
  52 #define __asm_copy_to_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
  53         __asm_copy_user_cont(to, from, ret,             \
  54                 "       GETW D1Ar1,[%1++]\n"            \
  55                 "       SETW [%0],D1Ar1\n"              \
  56                 "2:     SETW [%0++],D1Ar1\n" COPY,      \
  57                 "3:     ADD  %2,%2,#2\n" FIXUP,         \
  58                 "       .long 2b,3b\n" TENTRY)
  59
  60 #define __asm_copy_to_user_2(to, from, ret) \
  61         __asm_copy_to_user_2x_cont(to, from, ret, "", "", "")
  62
  63 #define __asm_copy_to_user_3(to, from, ret) \
  64         __asm_copy_to_user_2x_cont(to, from, ret,       \
  65                 "       GETB D1Ar1,[%1++]\n"            \
  66                 "       SETB [%0],D1Ar1\n"              \
  67                 "4:     SETB [%0++],D1Ar1\n",           \
  68                 "5:     ADD  %2,%2,#1\n",               \
  69                 "       .long 4b,5b\n")
  70
  71 #define __asm_copy_to_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
  72         __asm_copy_user_cont(to, from, ret,             \
  73                 "       GETD D1Ar1,[%1++]\n"            \
  74                 "       SETD [%0],D1Ar1\n"              \
  75                 "2:     SETD [%0++],D1Ar1\n" COPY,      \
  76                 "3:     ADD  %2,%2,#4\n" FIXUP,         \
  77                 "       .long 2b,3b\n" TENTRY)
  78
  79 #define __asm_copy_to_user_4(to, from, ret) \
  80         __asm_copy_to_user_4x_cont(to, from, ret, "", "", "")
  81
  82 #define __asm_copy_to_user_5(to, from, ret) \
  83         __asm_copy_to_user_4x_cont(to, from, ret,       \
  84                 "       GETB D1Ar1,[%1++]\n"            \
  85                 "       SETB [%0],D1Ar1\n"              \
  86                 "4:     SETB [%0++],D1Ar1\n",           \
  87                 "5:     ADD  %2,%2,#1\n",               \
  88                 "       .long 4b,5b\n")
  89
  90 #define __asm_copy_to_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
  91         __asm_copy_to_user_4x_cont(to, from, ret,       \
  92                 "       GETW D1Ar1,[%1++]\n"            \
  93                 "       SETW [%0],D1Ar1\n"              \
  94                 "4:     SETW [%0++],D1Ar1\n" COPY,      \
  95                 "5:     ADD  %2,%2,#2\n" FIXUP,         \
  96                 "       .long 4b,5b\n" TENTRY)
  97
  98 #define __asm_copy_to_user_6(to, from, ret) \
  99         __asm_copy_to_user_6x_cont(to, from, ret, "", "", "")
 100
 101 #define __asm_copy_to_user_7(to, from, ret) \
 102         __asm_copy_to_user_6x_cont(to, from, ret,       \
 103                 "       GETB D1Ar1,[%1++]\n"            \
 104                 "       SETB [%0],D1Ar1\n"              \
 105                 "6:     SETB [%0++],D1Ar1\n",           \
 106                 "7:     ADD  %2,%2,#1\n",               \
 107                 "       .long 6b,7b\n")
 108
 109 #define __asm_copy_to_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 110         __asm_copy_to_user_4x_cont(to, from, ret,       \
 111                 "       GETD D1Ar1,[%1++]\n"            \
 112                 "       SETD [%0],D1Ar1\n"              \
 113                 "4:     SETD [%0++],D1Ar1\n" COPY,      \
 114                 "5:     ADD  %2,%2,#4\n"  FIXUP,        \
 115                 "       .long 4b,5b\n" TENTRY)
 116
 117 #define __asm_copy_to_user_8(to, from, ret) \
 118         __asm_copy_to_user_8x_cont(to, from, ret, "", "", "")
 119
 120 #define __asm_copy_to_user_9(to, from, ret) \
 121         __asm_copy_to_user_8x_cont(to, from, ret,       \
 122                 "       GETB D1Ar1,[%1++]\n"            \
 123                 "       SETB [%0],D1Ar1\n"              \
 124                 "6:     SETB [%0++],D1Ar1\n",           \
 125                 "7:     ADD  %2,%2,#1\n",               \
 126                 "       .long 6b,7b\n")
 127
 128 #define __asm_copy_to_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 129         __asm_copy_to_user_8x_cont(to, from, ret,       \
 130                 "       GETW D1Ar1,[%1++]\n"            \
 131                 "       SETW [%0],D1Ar1\n"              \
 132                 "6:     SETW [%0++],D1Ar1\n" COPY,      \
 133                 "7:     ADD  %2,%2,#2\n" FIXUP,         \
 134                 "       .long 6b,7b\n" TENTRY)
 135
 136 #define __asm_copy_to_user_10(to, from, ret) \
 137         __asm_copy_to_user_10x_cont(to, from, ret, "", "", "")
 138
 139 #define __asm_copy_to_user_11(to, from, ret) \
 140         __asm_copy_to_user_10x_cont(to, from, ret,      \
 141                 "       GETB D1Ar1,[%1++]\n"            \
 142                 "       SETB [%0],D1Ar1\n"              \
 143                 "8:     SETB [%0++],D1Ar1\n",           \
 144                 "9:     ADD  %2,%2,#1\n",               \
 145                 "       .long 8b,9b\n")
 146
 147 #define __asm_copy_to_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 148         __asm_copy_to_user_8x_cont(to, from, ret,       \
 149                 "       GETD D1Ar1,[%1++]\n"            \
 150                 "       SETD [%0],D1Ar1\n"              \
 151                 "6:     SETD [%0++],D1Ar1\n" COPY,      \
 152                 "7:     ADD  %2,%2,#4\n" FIXUP,         \
 153                 "       .long 6b,7b\n" TENTRY)
 154 #define __asm_copy_to_user_12(to, from, ret) \
 155         __asm_copy_to_user_12x_cont(to, from, ret, "", "", "")
 156
 157 #define __asm_copy_to_user_13(to, from, ret) \
 158         __asm_copy_to_user_12x_cont(to, from, ret,      \
 159                 "       GETB D1Ar1,[%1++]\n"            \
 160                 "       SETB [%0],D1Ar1\n"              \
 161                 "8:     SETB [%0++],D1Ar1\n",           \
 162                 "9:     ADD  %2,%2,#1\n",               \
 163                 "       .long 8b,9b\n")
 164
 165 #define __asm_copy_to_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 166         __asm_copy_to_user_12x_cont(to, from, ret,      \
 167                 "       GETW D1Ar1,[%1++]\n"            \
 168                 "       SETW [%0],D1Ar1\n"              \
 169                 "8:     SETW [%0++],D1Ar1\n" COPY,      \
 170                 "9:     ADD  %2,%2,#2\n" FIXUP,         \
 171                 "       .long 8b,9b\n" TENTRY)
 172
 173 #define __asm_copy_to_user_14(to, from, ret) \
 174         __asm_copy_to_user_14x_cont(to, from, ret, "", "", "")
 175
 176 #define __asm_copy_to_user_15(to, from, ret) \
 177         __asm_copy_to_user_14x_cont(to, from, ret,      \
 178                 "       GETB D1Ar1,[%1++]\n"            \
 179                 "       SETB [%0],D1Ar1\n"              \
 180                 "10:    SETB [%0++],D1Ar1\n",           \
 181                 "11:    ADD  %2,%2,#1\n",               \
 182                 "       .long 10b,11b\n")
 183
 184 #define __asm_copy_to_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 185         __asm_copy_to_user_12x_cont(to, from, ret,      \
 186                 "       GETD D1Ar1,[%1++]\n"            \
 187                 "       SETD [%0],D1Ar1\n"              \
 188                 "8:     SETD [%0++],D1Ar1\n" COPY,      \
 189                 "9:     ADD  %2,%2,#4\n" FIXUP,         \
 190                 "       .long 8b,9b\n" TENTRY)
 191
 192 #define __asm_copy_to_user_16(to, from, ret) \
 193                 __asm_copy_to_user_16x_cont(to, from, ret, "", "", "")
 194
 195 #define __asm_copy_to_user_8x64(to, from, ret) \
 196         asm volatile (                                  \
 197                 "       GETL D0Ar2,D1Ar1,[%1++]\n"      \
 198                 "       SETL [%0],D0Ar2,D1Ar1\n"        \
 199                 "2:     SETL [%0++],D0Ar2,D1Ar1\n"      \
 200                 "1:\n"                                  \
 201                 "       .section .fixup,\"ax\"\n"       \
 202                 "3:     ADD  %2,%2,#8\n"                \
 203                 "       MOVT    D0Ar2,#HI(1b)\n"        \
 204                 "       JUMP    D0Ar2,#LO(1b)\n"        \
 205                 "       .previous\n"                    \
 206                 "       .section __ex_table,\"a\"\n"    \
 207                 "       .long 2b,3b\n"                  \
 208                 "       .previous\n"                    \
 209                 : "=r" (to), "=r" (from), "=r" (ret)    \
 210                 : "0" (to), "1" (from), "2" (ret)       \
 211                 : "D1Ar1", "D0Ar2", "memory")
 212
 213 /*
 214  *      optimized copying loop using RAPF when 64 bit aligned
 215  *
 216  *      n               will be automatically decremented inside the loop
 217  *      ret             will be left intact. if error occurs we will rewind
 218  *                      so that the original non optimized code will fill up
 219  *                      this value correctly.
 220  *
 221  *      on fault:
 222  *              >       n will hold total number of uncopied bytes
 223  *
 224  *              >       {'to','from'} will be rewind back so that
 225  *                      the non-optimized code will do the proper fix up
 226  *
 227  *      DCACHE drops the cacheline which helps in reducing cache
 228  *      pollution.
 229  *
 230  *      We introduce an extra SETL at the end of the loop to
 231  *      ensure we don't fall off the loop before we catch all
 232  *      erros.
 233  *
 234  *      NOTICE:
 235  *              LSM_STEP in TXSTATUS must be cleared in fix up code.
 236  *              since we're using M{S,G}ETL, a fault might happen at
 237  *              any address in the middle of M{S,G}ETL causing
 238  *              the value of LSM_STEP to be incorrect which can
 239  *              cause subsequent use of M{S,G}ET{L,D} to go wrong.
 240  *              ie: if LSM_STEP was 1 when a fault occurs, the
 241  *              next call to M{S,G}ET{L,D} will skip the first
 242  *              copy/getting as it think that the first 1 has already
 243  *              been done.
 244  *
 245  */
 246 #define __asm_copy_user_64bit_rapf_loop(                                \
 247                 to, from, ret, n, id, FIXUP)                            \
 248         asm volatile (                                                  \
 249                         ".balign 8\n"                                   \
 250                 "       MOV     RAPF, %1\n"                             \
 251                 "       MSETL   [A0StP++], D0Ar6, D0FrT, D0.5, D0.6, D0.7\n" \
 252                 "       MOV     D0Ar6, #0\n"                            \
 253                 "       LSR     D1Ar5, %3, #6\n"                        \
 254                 "       SUB     TXRPT, D1Ar5, #2\n"                     \
 255                 "       MOV     RAPF, %1\n"                             \
 256                 "$Lloop"id":\n"                                         \
 257                 "       ADD     RAPF, %1, #64\n"                        \
 258                 "21:    MGETL   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 259                 "22:    MSETL   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 260                 "23:    SUB     %3, %3, #32\n"                          \
 261                 "24:    MGETL   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 262                 "25:    MSETL   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 263                 "26:    SUB     %3, %3, #32\n"                          \
 264                 "       DCACHE  [%1+#-64], D0Ar6\n"                     \
 265                 "       BR      $Lloop"id"\n"                           \
 266                                                                         \
 267                 "       MOV     RAPF, %1\n"                             \
 268                 "27:    MGETL   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 269                 "28:    MSETL   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 270                 "29:    SUB     %3, %3, #32\n"                          \
 271                 "30:    MGETL   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 272                 "31:    MSETL   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 273                 "32:    SETL    [%0+#-8], D0.7, D1.7\n"                 \
 274                 "       SUB     %3, %3, #32\n"                          \
 275                 "1:     DCACHE  [%1+#-64], D0Ar6\n"                     \
 276                 "       GETL    D0Ar6, D1Ar5, [A0StP+#-40]\n"           \
 277                 "       GETL    D0FrT, D1RtP, [A0StP+#-32]\n"           \
 278                 "       GETL    D0.5, D1.5, [A0StP+#-24]\n"             \
 279                 "       GETL    D0.6, D1.6, [A0StP+#-16]\n"             \
 280                 "       GETL    D0.7, D1.7, [A0StP+#-8]\n"              \
 281                 "       SUB     A0StP, A0StP, #40\n"                    \
 282                 "       .section .fixup,\"ax\"\n"                       \
 283                 "3:     MOV     D0Ar2, TXSTATUS\n"                      \
 284                 "       MOV     D1Ar1, TXSTATUS\n"                      \
 285                 "       AND     D1Ar1, D1Ar1, #0xFFFFF8FF\n"            \
 286                 "       MOV     TXSTATUS, D1Ar1\n"                      \
 287                         FIXUP                                           \
 288                 "       MOVT    D0Ar2, #HI(1b)\n"                       \
 289                 "       JUMP    D0Ar2, #LO(1b)\n"                       \
 290                 "       .previous\n"                                    \
 291                 "       .section __ex_table,\"a\"\n"                    \
 292                 "       .long 21b,3b\n"                                 \
 293                 "       .long 22b,3b\n"                                 \
 294                 "       .long 23b,3b\n"                                 \
 295                 "       .long 24b,3b\n"                                 \
 296                 "       .long 25b,3b\n"                                 \
 297                 "       .long 26b,3b\n"                                 \
 298                 "       .long 27b,3b\n"                                 \
 299                 "       .long 28b,3b\n"                                 \
 300                 "       .long 29b,3b\n"                                 \
 301                 "       .long 30b,3b\n"                                 \
 302                 "       .long 31b,3b\n"                                 \
 303                 "       .long 32b,3b\n"                                 \
 304                 "       .previous\n"                                    \
 305                 : "=r" (to), "=r" (from), "=r" (ret), "=d" (n)          \
 306                 : "0" (to), "1" (from), "2" (ret), "3" (n)              \
 307                 : "D1Ar1", "D0Ar2", "cc", "memory")
 308
 309 /*      rewind 'to' and 'from'  pointers when a fault occurs
 310  *
 311  *      Rationale:
 312  *              A fault always occurs on writing to user buffer. A fault
 313  *              is at a single address, so we need to rewind by only 4
 314  *              bytes.
 315  *              Since we do a complete read from kernel buffer before
 316  *              writing, we need to rewind it also. The amount to be
 317  *              rewind equals the number of faulty writes in MSETD
 318  *              which is: [4 - (LSM_STEP-1)]*8
 319  *              LSM_STEP is bits 10:8 in TXSTATUS which is already read
 320  *              and stored in D0Ar2
 321  *
 322  *              NOTE: If a fault occurs at the last operation in M{G,S}ETL
 323  *                      LSM_STEP will be 0. ie: we do 4 writes in our case, if
 324  *                      a fault happens at the 4th write, LSM_STEP will be 0
 325  *                      instead of 4. The code copes with that.
 326  *
 327  *              n is updated by the number of successful writes, which is:
 328  *              n = n - (LSM_STEP-1)*8
 329  */
 330 #define __asm_copy_to_user_64bit_rapf_loop(to,  from, ret, n, id)\
 331         __asm_copy_user_64bit_rapf_loop(to, from, ret, n, id,           \
 332                 "LSR    D0Ar2, D0Ar2, #8\n"                             \
 333                 "ANDS   D0Ar2, D0Ar2, #0x7\n"                           \
 334                 "ADDZ   D0Ar2, D0Ar2, #4\n"                             \
 335                 "SUB    D0Ar2, D0Ar2, #1\n"                             \
 336                 "MOV    D1Ar1, #4\n"                                    \
 337                 "SUB    D0Ar2, D1Ar1, D0Ar2\n"                          \
 338                 "LSL    D0Ar2, D0Ar2, #3\n"                             \
 339                 "LSL    D1Ar1, D1Ar1, #3\n"                             \
 340                 "SUB    D1Ar1, D1Ar1, D0Ar2\n"                          \
 341                 "SUB    %0, %0, #8\n"                                   \
 342                 "SUB    %1,     %1,D0Ar2\n"                             \
 343                 "SUB    %3, %3, D1Ar1\n")
 344
 345 /*
 346  *      optimized copying loop using RAPF when 32 bit aligned
 347  *
 348  *      n               will be automatically decremented inside the loop
 349  *      ret             will be left intact. if error occurs we will rewind
 350  *                      so that the original non optimized code will fill up
 351  *                      this value correctly.
 352  *
 353  *      on fault:
 354  *              >       n will hold total number of uncopied bytes
 355  *
 356  *              >       {'to','from'} will be rewind back so that
 357  *                      the non-optimized code will do the proper fix up
 358  *
 359  *      DCACHE drops the cacheline which helps in reducing cache
 360  *      pollution.
 361  *
 362  *      We introduce an extra SETD at the end of the loop to
 363  *      ensure we don't fall off the loop before we catch all
 364  *      erros.
 365  *
 366  *      NOTICE:
 367  *              LSM_STEP in TXSTATUS must be cleared in fix up code.
 368  *              since we're using M{S,G}ETL, a fault might happen at
 369  *              any address in the middle of M{S,G}ETL causing
 370  *              the value of LSM_STEP to be incorrect which can
 371  *              cause subsequent use of M{S,G}ET{L,D} to go wrong.
 372  *              ie: if LSM_STEP was 1 when a fault occurs, the
 373  *              next call to M{S,G}ET{L,D} will skip the first
 374  *              copy/getting as it think that the first 1 has already
 375  *              been done.
 376  *
 377  */
 378 #define __asm_copy_user_32bit_rapf_loop(                                \
 379                         to,     from, ret, n, id, FIXUP)                \
 380         asm volatile (                                                  \
 381                         ".balign 8\n"                                   \
 382                 "       MOV     RAPF, %1\n"                             \
 383                 "       MSETL   [A0StP++], D0Ar6, D0FrT, D0.5, D0.6, D0.7\n" \
 384                 "       MOV     D0Ar6, #0\n"                            \
 385                 "       LSR     D1Ar5, %3, #6\n"                        \
 386                 "       SUB     TXRPT, D1Ar5, #2\n"                     \
 387                 "       MOV     RAPF, %1\n"                             \
 388                 "$Lloop"id":\n"                                         \
 389                 "       ADD     RAPF, %1, #64\n"                        \
 390                 "21:    MGETD   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 391                 "22:    MSETD   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 392                 "23:    SUB     %3, %3, #16\n"                          \
 393                 "24:    MGETD   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 394                 "25:    MSETD   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 395                 "26:    SUB     %3, %3, #16\n"                          \
 396                 "27:    MGETD   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 397                 "28:    MSETD   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 398                 "29:    SUB     %3, %3, #16\n"                          \
 399                 "30:    MGETD   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 400                 "31:    MSETD   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 401                 "32:    SUB     %3, %3, #16\n"                          \
 402                 "       DCACHE  [%1+#-64], D0Ar6\n"                     \
 403                 "       BR      $Lloop"id"\n"                           \
 404                                                                         \
 405                 "       MOV     RAPF, %1\n"                             \
 406                 "33:    MGETD   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 407                 "34:    MSETD   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 408                 "35:    SUB     %3, %3, #16\n"                          \
 409                 "36:    MGETD   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 410                 "37:    MSETD   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 411                 "38:    SUB     %3, %3, #16\n"                          \
 412                 "39:    MGETD   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 413                 "40:    MSETD   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 414                 "41:    SUB     %3, %3, #16\n"                          \
 415                 "42:    MGETD   D0FrT, D0.5, D0.6, D0.7, [%1++]\n"      \
 416                 "43:    MSETD   [%0++], D0FrT, D0.5, D0.6, D0.7\n"      \
 417                 "44:    SETD    [%0+#-4], D0.7\n"                       \
 418                 "       SUB     %3, %3, #16\n"                          \
 419                 "1:     DCACHE  [%1+#-64], D0Ar6\n"                     \
 420                 "       GETL    D0Ar6, D1Ar5, [A0StP+#-40]\n"           \
 421                 "       GETL    D0FrT, D1RtP, [A0StP+#-32]\n"           \
 422                 "       GETL    D0.5, D1.5, [A0StP+#-24]\n"             \
 423                 "       GETL    D0.6, D1.6, [A0StP+#-16]\n"             \
 424                 "       GETL    D0.7, D1.7, [A0StP+#-8]\n"              \
 425                 "       SUB A0StP, A0StP, #40\n"                        \
 426                 "       .section .fixup,\"ax\"\n"                       \
 427                 "3:     MOV     D0Ar2, TXSTATUS\n"                      \
 428                 "       MOV     D1Ar1, TXSTATUS\n"                      \
 429                 "       AND     D1Ar1, D1Ar1, #0xFFFFF8FF\n"            \
 430                 "       MOV     TXSTATUS, D1Ar1\n"                      \
 431                         FIXUP                                           \
 432                 "       MOVT    D0Ar2, #HI(1b)\n"                       \
 433                 "       JUMP    D0Ar2, #LO(1b)\n"                       \
 434                 "       .previous\n"                                    \
 435                 "       .section __ex_table,\"a\"\n"                    \
 436                 "       .long 21b,3b\n"                                 \
 437                 "       .long 22b,3b\n"                                 \
 438                 "       .long 23b,3b\n"                                 \
 439                 "       .long 24b,3b\n"                                 \
 440                 "       .long 25b,3b\n"                                 \
 441                 "       .long 26b,3b\n"                                 \
 442                 "       .long 27b,3b\n"                                 \
 443                 "       .long 28b,3b\n"                                 \
 444                 "       .long 29b,3b\n"                                 \
 445                 "       .long 30b,3b\n"                                 \
 446                 "       .long 31b,3b\n"                                 \
 447                 "       .long 32b,3b\n"                                 \
 448                 "       .long 33b,3b\n"                                 \
 449                 "       .long 34b,3b\n"                                 \
 450                 "       .long 35b,3b\n"                                 \
 451                 "       .long 36b,3b\n"                                 \
 452                 "       .long 37b,3b\n"                                 \
 453                 "       .long 38b,3b\n"                                 \
 454                 "       .long 39b,3b\n"                                 \
 455                 "       .long 40b,3b\n"                                 \
 456                 "       .long 41b,3b\n"                                 \
 457                 "       .long 42b,3b\n"                                 \
 458                 "       .long 43b,3b\n"                                 \
 459                 "       .long 44b,3b\n"                                 \
 460                 "       .previous\n"                                    \
 461                 : "=r" (to), "=r" (from), "=r" (ret), "=d" (n)          \
 462                 : "0" (to), "1" (from), "2" (ret), "3" (n)              \
 463                 : "D1Ar1", "D0Ar2", "cc", "memory")
 464
 465 /*      rewind 'to' and 'from'  pointers when a fault occurs
 466  *
 467  *      Rationale:
 468  *              A fault always occurs on writing to user buffer. A fault
 469  *              is at a single address, so we need to rewind by only 4
 470  *              bytes.
 471  *              Since we do a complete read from kernel buffer before
 472  *              writing, we need to rewind it also. The amount to be
 473  *              rewind equals the number of faulty writes in MSETD
 474  *              which is: [4 - (LSM_STEP-1)]*4
 475  *              LSM_STEP is bits 10:8 in TXSTATUS which is already read
 476  *              and stored in D0Ar2
 477  *
 478  *              NOTE: If a fault occurs at the last operation in M{G,S}ETL
 479  *                      LSM_STEP will be 0. ie: we do 4 writes in our case, if
 480  *                      a fault happens at the 4th write, LSM_STEP will be 0
 481  *                      instead of 4. The code copes with that.
 482  *
 483  *              n is updated by the number of successful writes, which is:
 484  *              n = n - (LSM_STEP-1)*4
 485  */
 486 #define __asm_copy_to_user_32bit_rapf_loop(to, from, ret, n, id)\
 487         __asm_copy_user_32bit_rapf_loop(to, from, ret, n, id,           \
 488                 "LSR    D0Ar2, D0Ar2, #8\n"                             \
 489                 "ANDS   D0Ar2, D0Ar2, #0x7\n"                           \
 490                 "ADDZ   D0Ar2, D0Ar2, #4\n"                             \
 491                 "SUB    D0Ar2, D0Ar2, #1\n"                             \
 492                 "MOV    D1Ar1, #4\n"                                    \
 493                 "SUB    D0Ar2, D1Ar1, D0Ar2\n"                          \
 494                 "LSL    D0Ar2, D0Ar2, #2\n"                             \
 495                 "LSL    D1Ar1, D1Ar1, #2\n"                             \
 496                 "SUB    D1Ar1, D1Ar1, D0Ar2\n"                          \
 497                 "SUB    %0, %0, #4\n"                                   \
 498                 "SUB    %1,     %1,     D0Ar2\n"                        \
 499                 "SUB    %3, %3, D1Ar1\n")
 500
 501 unsigned long raw_copy_to_user(void __user *pdst, const void *psrc,
 502                                unsigned long n)
 503 {
 504         register char __user *dst asm ("A0.2") = pdst;
 505         register const char *src asm ("A1.2") = psrc;
 506         unsigned long retn = 0;
 507
 508         if (n == 0)
 509                 return 0;
 510
 511         if ((unsigned long) src & 1) {
 512                 __asm_copy_to_user_1(dst, src, retn);
 513                 n--;
 514                 if (retn)
 515                         return retn + n;
 516         }
 517         if ((unsigned long) dst & 1) {
 518                 /* Worst case - byte copy */
 519                 while (n > 0) {
 520                         __asm_copy_to_user_1(dst, src, retn);
 521                         n--;
 522                         if (retn)
 523                                 return retn + n;
 524                 }
 525         }
 526         if (((unsigned long) src & 2) && n >= 2) {
 527                 __asm_copy_to_user_2(dst, src, retn);
 528                 n -= 2;
 529                 if (retn)
 530                         return retn + n;
 531         }
 532         if ((unsigned long) dst & 2) {
 533                 /* Second worst case - word copy */
 534                 while (n >= 2) {
 535                         __asm_copy_to_user_2(dst, src, retn);
 536                         n -= 2;
 537                         if (retn)
 538                                 return retn + n;
 539                 }
 540         }
 541
 542 #ifdef USE_RAPF
 543         /* 64 bit copy loop */
 544         if (!(((unsigned long) src | (__force unsigned long) dst) & 7)) {
 545                 if (n >= RAPF_MIN_BUF_SIZE) {
 546                         /* copy user using 64 bit rapf copy */
 547                         __asm_copy_to_user_64bit_rapf_loop(dst, src, retn,
 548                                                         n, "64cu");
 549                 }
 550                 while (n >= 8) {
 551                         __asm_copy_to_user_8x64(dst, src, retn);
 552                         n -= 8;
 553                         if (retn)
 554                                 return retn + n;
 555                 }
 556         }
 557         if (n >= RAPF_MIN_BUF_SIZE) {
 558                 /* copy user using 32 bit rapf copy */
 559                 __asm_copy_to_user_32bit_rapf_loop(dst, src, retn, n, "32cu");
 560         }
 561 #else
 562         /* 64 bit copy loop */
 563         if (!(((unsigned long) src | (__force unsigned long) dst) & 7)) {
 564                 while (n >= 8) {
 565                         __asm_copy_to_user_8x64(dst, src, retn);
 566                         n -= 8;
 567                         if (retn)
 568                                 return retn + n;
 569                 }
 570         }
 571 #endif
 572
 573         while (n >= 16) {
 574                 __asm_copy_to_user_16(dst, src, retn);
 575                 n -= 16;
 576                 if (retn)
 577                         return retn + n;
 578         }
 579
 580         while (n >= 4) {
 581                 __asm_copy_to_user_4(dst, src, retn);
 582                 n -= 4;
 583                 if (retn)
 584                         return retn + n;
 585         }
 586
 587         switch (n) {
 588         case 0:
 589                 break;
 590         case 1:
 591                 __asm_copy_to_user_1(dst, src, retn);
 592                 break;
 593         case 2:
 594                 __asm_copy_to_user_2(dst, src, retn);
 595                 break;
 596         case 3:
 597                 __asm_copy_to_user_3(dst, src, retn);
 598                 break;
 599         }
 600
 601         /*
 602          * If we get here, retn correctly reflects the number of failing
 603          * bytes.
 604          */
 605         return retn;
 606 }
 607 EXPORT_SYMBOL(raw_copy_to_user);
 608
 609 #define __asm_copy_from_user_1(to, from, ret) \
 610         __asm_copy_user_cont(to, from, ret,     \
 611                 "       GETB D1Ar1,[%1++]\n"    \
 612                 "2:     SETB [%0++],D1Ar1\n",   \
 613                 "3:     ADD  %2,%2,#1\n",       \
 614                 "       .long 2b,3b\n")
 615
 616 #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 617         __asm_copy_user_cont(to, from, ret,             \
 618                 "       GETW D1Ar1,[%1++]\n"            \
 619                 "2:     SETW [%0++],D1Ar1\n" COPY,      \
 620                 "3:     ADD  %2,%2,#2\n" FIXUP,         \
 621                 "       .long 2b,3b\n" TENTRY)
 622
 623 #define __asm_copy_from_user_2(to, from, ret) \
 624         __asm_copy_from_user_2x_cont(to, from, ret, "", "", "")
 625
 626 #define __asm_copy_from_user_3(to, from, ret)           \
 627         __asm_copy_from_user_2x_cont(to, from, ret,     \
 628                 "       GETB D1Ar1,[%1++]\n"            \
 629                 "4:     SETB [%0++],D1Ar1\n",           \
 630                 "5:     ADD  %2,%2,#1\n",               \
 631                 "       .long 4b,5b\n")
 632
 633 #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 634         __asm_copy_user_cont(to, from, ret,             \
 635                 "       GETD D1Ar1,[%1++]\n"            \
 636                 "2:     SETD [%0++],D1Ar1\n" COPY,      \
 637                 "3:     ADD  %2,%2,#4\n" FIXUP,         \
 638                 "       .long 2b,3b\n" TENTRY)
 639
 640 #define __asm_copy_from_user_4(to, from, ret) \
 641         __asm_copy_from_user_4x_cont(to, from, ret, "", "", "")
 642
 643 #define __asm_copy_from_user_8x64(to, from, ret) \
 644         asm volatile (                          \
 645                 "       GETL D0Ar2,D1Ar1,[%1++]\n"      \
 646                 "2:     SETL [%0++],D0Ar2,D1Ar1\n"      \
 647                 "1:\n"                                  \
 648                 "       .section .fixup,\"ax\"\n"       \
 649                 "3:     ADD  %2,%2,#8\n"                \
 650                 "       MOVT    D0Ar2,#HI(1b)\n"        \
 651                 "       JUMP    D0Ar2,#LO(1b)\n"        \
 652                 "       .previous\n"                    \
 653                 "       .section __ex_table,\"a\"\n"    \
 654                 "       .long 2b,3b\n"                  \
 655                 "       .previous\n"                    \
 656                 : "=a" (to), "=r" (from), "=r" (ret)    \
 657                 : "0" (to), "1" (from), "2" (ret)       \
 658                 : "D1Ar1", "D0Ar2", "memory")
 659
 660 /*      rewind 'from' pointer when a fault occurs
 661  *
 662  *      Rationale:
 663  *              A fault occurs while reading from user buffer, which is the
 664  *              source.
 665  *              Since we don't write to kernel buffer until we read first,
 666  *              the kernel buffer is at the right state and needn't be
 667  *              corrected, but the source must be rewound to the beginning of
 668  *              the block, which is LSM_STEP*8 bytes.
 669  *              LSM_STEP is bits 10:8 in TXSTATUS which is already read
 670  *              and stored in D0Ar2
 671  *
 672  *              NOTE: If a fault occurs at the last operation in M{G,S}ETL
 673  *                      LSM_STEP will be 0. ie: we do 4 writes in our case, if
 674  *                      a fault happens at the 4th write, LSM_STEP will be 0
 675  *                      instead of 4. The code copes with that.
 676  */
 677 #define __asm_copy_from_user_64bit_rapf_loop(to, from, ret, n, id)      \
 678         __asm_copy_user_64bit_rapf_loop(to, from, ret, n, id,           \
 679                 "LSR    D0Ar2, D0Ar2, #5\n"                             \
 680                 "ANDS   D0Ar2, D0Ar2, #0x38\n"                          \
 681                 "ADDZ   D0Ar2, D0Ar2, #32\n"                            \
 682                 "SUB    %1, %1, D0Ar2\n")
 683
 684 /*      rewind 'from' pointer when a fault occurs
 685  *
 686  *      Rationale:
 687  *              A fault occurs while reading from user buffer, which is the
 688  *              source.
 689  *              Since we don't write to kernel buffer until we read first,
 690  *              the kernel buffer is at the right state and needn't be
 691  *              corrected, but the source must be rewound to the beginning of
 692  *              the block, which is LSM_STEP*4 bytes.
 693  *              LSM_STEP is bits 10:8 in TXSTATUS which is already read
 694  *              and stored in D0Ar2
 695  *
 696  *              NOTE: If a fault occurs at the last operation in M{G,S}ETL
 697  *                      LSM_STEP will be 0. ie: we do 4 writes in our case, if
 698  *                      a fault happens at the 4th write, LSM_STEP will be 0
 699  *                      instead of 4. The code copes with that.
 700  */
 701 #define __asm_copy_from_user_32bit_rapf_loop(to, from, ret, n, id)      \
 702         __asm_copy_user_32bit_rapf_loop(to, from, ret, n, id,           \
 703                 "LSR    D0Ar2, D0Ar2, #6\n"                             \
 704                 "ANDS   D0Ar2, D0Ar2, #0x1c\n"                          \
 705                 "ADDZ   D0Ar2, D0Ar2, #16\n"                            \
 706                 "SUB    %1, %1, D0Ar2\n")
 707
 708
 709 /*
 710  * Copy from user to kernel. The return-value is the number of bytes that were
 711  * inaccessible.
 712  */
 713 unsigned long raw_copy_from_user(void *pdst, const void __user *psrc,
 714                                  unsigned long n)
 715 {
 716         register char *dst asm ("A0.2") = pdst;
 717         register const char __user *src asm ("A1.2") = psrc;
 718         unsigned long retn = 0;
 719
 720         if (n == 0)
 721                 return 0;
 722
 723         if ((unsigned long) src & 1) {
 724                 __asm_copy_from_user_1(dst, src, retn);
 725                 n--;
 726                 if (retn)
 727                         return retn + n;
 728         }
 729         if ((unsigned long) dst & 1) {
 730                 /* Worst case - byte copy */
 731                 while (n > 0) {
 732                         __asm_copy_from_user_1(dst, src, retn);
 733                         n--;
 734                         if (retn)
 735                                 return retn + n;
 736                 }
 737         }
 738         if (((unsigned long) src & 2) && n >= 2) {
 739                 __asm_copy_from_user_2(dst, src, retn);
 740                 n -= 2;
 741                 if (retn)
 742                         return retn + n;
 743         }
 744         if ((unsigned long) dst & 2) {
 745                 /* Second worst case - word copy */
 746                 while (n >= 2) {
 747                         __asm_copy_from_user_2(dst, src, retn);
 748                         n -= 2;
 749                         if (retn)
 750                                 return retn + n;
 751                 }
 752         }
 753
 754 #ifdef USE_RAPF
 755         /* 64 bit copy loop */
 756         if (!(((unsigned long) src | (unsigned long) dst) & 7)) {
 757                 if (n >= RAPF_MIN_BUF_SIZE) {
 758                         /* Copy using fast 64bit rapf */
 759                         __asm_copy_from_user_64bit_rapf_loop(dst, src, retn,
 760                                                         n, "64cuz");
 761                 }
 762                 while (n >= 8) {
 763                         __asm_copy_from_user_8x64(dst, src, retn);
 764                         n -= 8;
 765                         if (retn)
 766                                 return retn + n;
 767                 }
 768         }
 769
 770         if (n >= RAPF_MIN_BUF_SIZE) {
 771                 /* Copy using fast 32bit rapf */
 772                 __asm_copy_from_user_32bit_rapf_loop(dst, src, retn,
 773                                                 n, "32cuz");
 774         }
 775 #else
 776         /* 64 bit copy loop */
 777         if (!(((unsigned long) src | (unsigned long) dst) & 7)) {
 778                 while (n >= 8) {
 779                         __asm_copy_from_user_8x64(dst, src, retn);
 780                         n -= 8;
 781                         if (retn)
 782                                 return retn + n;
 783                 }
 784         }
 785 #endif
 786
 787         while (n >= 4) {
 788                 __asm_copy_from_user_4(dst, src, retn);
 789                 n -= 4;
 790
 791                 if (retn)
 792                         return retn + n;
 793         }
 794
 795         /* If we get here, there were no memory read faults.  */
 796         switch (n) {
 797                 /* These copies are at least "naturally aligned" (so we don't
 798                    have to check each byte), due to the src alignment code.
 799                    The *_3 case *will* get the correct count for retn.  */
 800         case 0:
 801                 /* This case deliberately left in (if you have doubts check the
 802                    generated assembly code).  */
 803                 break;
 804         case 1:
 805                 __asm_copy_from_user_1(dst, src, retn);
 806                 break;
 807         case 2:
 808                 __asm_copy_from_user_2(dst, src, retn);
 809                 break;
 810         case 3:
 811                 __asm_copy_from_user_3(dst, src, retn);
 812                 break;
 813         }
 814
 815         /* If we get here, retn correctly reflects the number of failing
 816            bytes.  */
 817         return retn;
 818 }
 819 EXPORT_SYMBOL(raw_copy_from_user);
 820
 821 #define __asm_clear_8x64(to, ret) \
 822         asm volatile (                                  \
 823                 "       MOV  D0Ar2,#0\n"                \
 824                 "       MOV  D1Ar1,#0\n"                \
 825                 "       SETL [%0],D0Ar2,D1Ar1\n"        \
 826                 "2:     SETL [%0++],D0Ar2,D1Ar1\n"      \
 827                 "1:\n"                                  \
 828                 "       .section .fixup,\"ax\"\n"       \
 829                 "3:     ADD  %1,%1,#8\n"                \
 830                 "       MOVT    D0Ar2,#HI(1b)\n"        \
 831                 "       JUMP    D0Ar2,#LO(1b)\n"        \
 832                 "       .previous\n"                    \
 833                 "       .section __ex_table,\"a\"\n"    \
 834                 "       .long 2b,3b\n"                  \
 835                 "       .previous\n"                    \
 836                 : "=r" (to), "=r" (ret) \
 837                 : "0" (to), "1" (ret)   \
 838                 : "D1Ar1", "D0Ar2", "memory")
 839
 840 /* Zero userspace.  */
 841
 842 #define __asm_clear(to, ret, CLEAR, FIXUP, TENTRY) \
 843         asm volatile (                                  \
 844                 "       MOV D1Ar1,#0\n"                 \
 845                         CLEAR                           \
 846                 "1:\n"                                  \
 847                 "       .section .fixup,\"ax\"\n"       \
 848                         FIXUP                           \
 849                 "       MOVT    D1Ar1,#HI(1b)\n"        \
 850                 "       JUMP    D1Ar1,#LO(1b)\n"        \
 851                 "       .previous\n"                    \
 852                 "       .section __ex_table,\"a\"\n"    \
 853                         TENTRY                          \
 854                 "       .previous"                      \
 855                 : "=r" (to), "=r" (ret)                 \
 856                 : "0" (to), "1" (ret)                   \
 857                 : "D1Ar1", "memory")
 858
 859 #define __asm_clear_1(to, ret) \
 860         __asm_clear(to, ret,                    \
 861                 "       SETB [%0],D1Ar1\n"      \
 862                 "2:     SETB [%0++],D1Ar1\n",   \
 863                 "3:     ADD  %1,%1,#1\n",       \
 864                 "       .long 2b,3b\n")
 865
 866 #define __asm_clear_2(to, ret) \
 867         __asm_clear(to, ret,                    \
 868                 "       SETW [%0],D1Ar1\n"      \
 869                 "2:     SETW [%0++],D1Ar1\n",   \
 870                 "3:     ADD  %1,%1,#2\n",       \
 871                 "       .long 2b,3b\n")
 872
 873 #define __asm_clear_3(to, ret) \
 874         __asm_clear(to, ret,                    \
 875                  "2:    SETW [%0++],D1Ar1\n"    \
 876                  "      SETB [%0],D1Ar1\n"      \
 877                  "3:    SETB [%0++],D1Ar1\n",   \
 878                  "4:    ADD  %1,%1,#2\n"        \
 879                  "5:    ADD  %1,%1,#1\n",       \
 880                  "      .long 2b,4b\n"          \
 881                  "      .long 3b,5b\n")
 882
 883 #define __asm_clear_4x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 884         __asm_clear(to, ret,                            \
 885                 "       SETD [%0],D1Ar1\n"              \
 886                 "2:     SETD [%0++],D1Ar1\n" CLEAR,     \
 887                 "3:     ADD  %1,%1,#4\n" FIXUP,         \
 888                 "       .long 2b,3b\n" TENTRY)
 889
 890 #define __asm_clear_4(to, ret) \
 891         __asm_clear_4x_cont(to, ret, "", "", "")
 892
 893 #define __asm_clear_8x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 894         __asm_clear_4x_cont(to, ret,                    \
 895                 "       SETD [%0],D1Ar1\n"              \
 896                 "4:     SETD [%0++],D1Ar1\n" CLEAR,     \
 897                 "5:     ADD  %1,%1,#4\n" FIXUP,         \
 898                 "       .long 4b,5b\n" TENTRY)
 899
 900 #define __asm_clear_8(to, ret) \
 901         __asm_clear_8x_cont(to, ret, "", "", "")
 902
 903 #define __asm_clear_12x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 904         __asm_clear_8x_cont(to, ret,                    \
 905                 "       SETD [%0],D1Ar1\n"              \
 906                 "6:     SETD [%0++],D1Ar1\n" CLEAR,     \
 907                 "7:     ADD  %1,%1,#4\n" FIXUP,         \
 908                 "       .long 6b,7b\n" TENTRY)
 909
 910 #define __asm_clear_12(to, ret) \
 911         __asm_clear_12x_cont(to, ret, "", "", "")
 912
 913 #define __asm_clear_16x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 914         __asm_clear_12x_cont(to, ret,                   \
 915                 "       SETD [%0],D1Ar1\n"              \
 916                 "8:     SETD [%0++],D1Ar1\n" CLEAR,     \
 917                 "9:     ADD  %1,%1,#4\n" FIXUP,         \
 918                 "       .long 8b,9b\n" TENTRY)
 919
 920 #define __asm_clear_16(to, ret) \
 921         __asm_clear_16x_cont(to, ret, "", "", "")
 922
 923 unsigned long __do_clear_user(void __user *pto, unsigned long pn)
 924 {
 925         register char __user *dst asm ("D0Re0") = pto;
 926         register unsigned long n asm ("D1Re0") = pn;
 927         register unsigned long retn asm ("D0Ar6") = 0;
 928
 929         if ((unsigned long) dst & 1) {
 930                 __asm_clear_1(dst, retn);
 931                 n--;
 932         }
 933
 934         if ((unsigned long) dst & 2) {
 935                 __asm_clear_2(dst, retn);
 936                 n -= 2;
 937         }
 938
 939         /* 64 bit copy loop */
 940         if (!((__force unsigned long) dst & 7)) {
 941                 while (n >= 8) {
 942                         __asm_clear_8x64(dst, retn);
 943                         n -= 8;
 944                 }
 945         }
 946
 947         while (n >= 16) {
 948                 __asm_clear_16(dst, retn);
 949                 n -= 16;
 950         }
 951
 952         while (n >= 4) {
 953                 __asm_clear_4(dst, retn);
 954                 n -= 4;
 955         }
 956
 957         switch (n) {
 958         case 0:
 959                 break;
 960         case 1:
 961                 __asm_clear_1(dst, retn);
 962                 break;
 963         case 2:
 964                 __asm_clear_2(dst, retn);
 965                 break;
 966         case 3:
 967                 __asm_clear_3(dst, retn);
 968                 break;
 969         }
 970
 971         return retn;
 972 }
 973 EXPORT_SYMBOL(__do_clear_user);
 974
 975 unsigned char __get_user_asm_b(const void __user *addr, long *err)
 976 {
 977         register unsigned char x asm ("D0Re0") = 0;
 978         asm volatile (
 979                 "       GETB %0,[%2]\n"
 980                 "1:\n"
 981                 "       GETB %0,[%2]\n"
 982                 "2:\n"
 983                 "       .section .fixup,\"ax\"\n"
 984                 "3:     MOV     D0FrT,%3\n"
 985                 "       SETD    [%1],D0FrT\n"
 986                 "       MOVT    D0FrT,#HI(2b)\n"
 987                 "       JUMP    D0FrT,#LO(2b)\n"
 988                 "       .previous\n"
 989                 "       .section __ex_table,\"a\"\n"
 990                 "       .long 1b,3b\n"
 991                 "       .previous\n"
 992                 : "=r" (x)
 993                 : "r" (err), "r" (addr), "P" (-EFAULT)
 994                 : "D0FrT");
 995         return x;
 996 }
 997 EXPORT_SYMBOL(__get_user_asm_b);
 998
 999 unsigned short __get_user_asm_w(const void __user *addr, long *err)
1000 {
1001         register unsigned short x asm ("D0Re0") = 0;
1002         asm volatile (
1003                 "       GETW %0,[%2]\n"
1004                 "1:\n"
1005                 "       GETW %0,[%2]\n"
1006                 "2:\n"
1007                 "       .section .fixup,\"ax\"\n"
1008                 "3:     MOV     D0FrT,%3\n"
1009                 "       SETD    [%1],D0FrT\n"
1010                 "       MOVT    D0FrT,#HI(2b)\n"
1011                 "       JUMP    D0FrT,#LO(2b)\n"
1012                 "       .previous\n"
1013                 "       .section __ex_table,\"a\"\n"
1014                 "       .long 1b,3b\n"
1015                 "       .previous\n"
1016                 : "=r" (x)
1017                 : "r" (err), "r" (addr), "P" (-EFAULT)
1018                 : "D0FrT");
1019         return x;
1020 }
1021 EXPORT_SYMBOL(__get_user_asm_w);
1022
1023 unsigned int __get_user_asm_d(const void __user *addr, long *err)
1024 {
1025         register unsigned int x asm ("D0Re0") = 0;
1026         asm volatile (
1027                 "       GETD %0,[%2]\n"
1028                 "1:\n"
1029                 "       GETD %0,[%2]\n"
1030                 "2:\n"
1031                 "       .section .fixup,\"ax\"\n"
1032                 "3:     MOV     D0FrT,%3\n"
1033                 "       SETD    [%1],D0FrT\n"
1034                 "       MOVT    D0FrT,#HI(2b)\n"
1035                 "       JUMP    D0FrT,#LO(2b)\n"
1036                 "       .previous\n"
1037                 "       .section __ex_table,\"a\"\n"
1038                 "       .long 1b,3b\n"
1039                 "       .previous\n"
1040                 : "=r" (x)
1041                 : "r" (err), "r" (addr), "P" (-EFAULT)
1042                 : "D0FrT");
1043         return x;
1044 }
1045 EXPORT_SYMBOL(__get_user_asm_d);
1046
1047 unsigned long long __get_user_asm_l(const void __user *addr, long *err)
1048 {
1049         register unsigned long long x asm ("D0Re0") = 0;
1050         asm volatile (
1051                 "       GETL %0,%t0,[%2]\n"
1052                 "1:\n"
1053                 "       GETL %0,%t0,[%2]\n"
1054                 "2:\n"
1055                 "       .section .fixup,\"ax\"\n"
1056                 "3:     MOV     D0FrT,%3\n"
1057                 "       SETD    [%1],D0FrT\n"
1058                 "       MOVT    D0FrT,#HI(2b)\n"
1059                 "       JUMP    D0FrT,#LO(2b)\n"
1060                 "       .previous\n"
1061                 "       .section __ex_table,\"a\"\n"
1062                 "       .long 1b,3b\n"
1063                 "       .previous\n"
1064                 : "=r" (x)
1065                 : "r" (err), "r" (addr), "P" (-EFAULT)
1066                 : "D0FrT");
1067         return x;
1068 }
1069 EXPORT_SYMBOL(__get_user_asm_l);
1070
1071 long __put_user_asm_b(unsigned int x, void __user *addr)
1072 {
1073         register unsigned int err asm ("D0Re0") = 0;
1074         asm volatile (
1075                 "       MOV  %0,#0\n"
1076                 "       SETB [%2],%1\n"
1077                 "1:\n"
1078                 "       SETB [%2],%1\n"
1079                 "2:\n"
1080                 ".section .fixup,\"ax\"\n"
1081                 "3:     MOV     %0,%3\n"
1082                 "       MOVT    D0FrT,#HI(2b)\n"
1083                 "       JUMP    D0FrT,#LO(2b)\n"
1084                 ".previous\n"
1085                 ".section __ex_table,\"a\"\n"
1086                 "       .long 1b,3b\n"
1087                 ".previous"
1088                 : "=r"(err)
1089                 : "d" (x), "a" (addr), "P"(-EFAULT)
1090                 : "D0FrT");
1091         return err;
1092 }
1093 EXPORT_SYMBOL(__put_user_asm_b);
1094
1095 long __put_user_asm_w(unsigned int x, void __user *addr)
1096 {
1097         register unsigned int err asm ("D0Re0") = 0;
1098         asm volatile (
1099                 "       MOV  %0,#0\n"
1100                 "       SETW [%2],%1\n"
1101                 "1:\n"
1102                 "       SETW [%2],%1\n"
1103                 "2:\n"
1104                 ".section .fixup,\"ax\"\n"
1105                 "3:     MOV     %0,%3\n"
1106                 "       MOVT    D0FrT,#HI(2b)\n"
1107                 "       JUMP    D0FrT,#LO(2b)\n"
1108                 ".previous\n"
1109                 ".section __ex_table,\"a\"\n"
1110                 "       .long 1b,3b\n"
1111                 ".previous"
1112                 : "=r"(err)
1113                 : "d" (x), "a" (addr), "P"(-EFAULT)
1114                 : "D0FrT");
1115         return err;
1116 }
1117 EXPORT_SYMBOL(__put_user_asm_w);
1118
1119 long __put_user_asm_d(unsigned int x, void __user *addr)
1120 {
1121         register unsigned int err asm ("D0Re0") = 0;
1122         asm volatile (
1123                 "       MOV  %0,#0\n"
1124                 "       SETD [%2],%1\n"
1125                 "1:\n"
1126                 "       SETD [%2],%1\n"
1127                 "2:\n"
1128                 ".section .fixup,\"ax\"\n"
1129                 "3:     MOV     %0,%3\n"
1130                 "       MOVT    D0FrT,#HI(2b)\n"
1131                 "       JUMP    D0FrT,#LO(2b)\n"
1132                 ".previous\n"
1133                 ".section __ex_table,\"a\"\n"
1134                 "       .long 1b,3b\n"
1135                 ".previous"
1136                 : "=r"(err)
1137                 : "d" (x), "a" (addr), "P"(-EFAULT)
1138                 : "D0FrT");
1139         return err;
1140 }
1141 EXPORT_SYMBOL(__put_user_asm_d);
1142
1143 long __put_user_asm_l(unsigned long long x, void __user *addr)
1144 {
1145         register unsigned int err asm ("D0Re0") = 0;
1146         asm volatile (
1147                 "       MOV  %0,#0\n"
1148                 "       SETL [%2],%1,%t1\n"
1149                 "1:\n"
1150                 "       SETL [%2],%1,%t1\n"
1151                 "2:\n"
1152                 ".section .fixup,\"ax\"\n"
1153                 "3:     MOV     %0,%3\n"
1154                 "       MOVT    D0FrT,#HI(2b)\n"
1155                 "       JUMP    D0FrT,#LO(2b)\n"
1156                 ".previous\n"
1157                 ".section __ex_table,\"a\"\n"
1158                 "       .long 1b,3b\n"
1159                 ".previous"
1160                 : "=r"(err)
1161                 : "d" (x), "a" (addr), "P"(-EFAULT)
1162                 : "D0FrT");
1163         return err;
1164 }
1165 EXPORT_SYMBOL(__put_user_asm_l);
1166
1167 long strnlen_user(const char __user *src, long count)
1168 {
1169         long res;
1170
1171         if (!access_ok(VERIFY_READ, src, 0))
1172                 return 0;
1173
1174         asm volatile (" MOV     D0Ar4, %1\n"
1175                       " MOV     D0Ar6, %2\n"
1176                       "0:\n"
1177                       " SUBS    D0FrT, D0Ar6, #0\n"
1178                       " SUB     D0Ar6, D0Ar6, #1\n"
1179                       " BLE     2f\n"
1180                       " GETB    D0FrT, [D0Ar4+#1++]\n"
1181                       "1:\n"
1182                       " TST     D0FrT, #255\n"
1183                       " BNE     0b\n"
1184                       "2:\n"
1185                       " SUB     %0, %2, D0Ar6\n"
1186                       "3:\n"
1187                       " .section .fixup,\"ax\"\n"
1188                       "4:\n"
1189                       " MOV     %0, #0\n"
1190                       " MOVT    D0FrT,#HI(3b)\n"
1191                       " JUMP    D0FrT,#LO(3b)\n"
1192                       " .previous\n"
1193                       " .section __ex_table,\"a\"\n"
1194                       " .long 1b,4b\n"
1195                       " .previous\n"
1196                       : "=r" (res)
1197                       : "r" (src), "r" (count)
1198                       : "D0FrT", "D0Ar4", "D0Ar6", "cc");
1199
1200         return res;
1201 }
1202 EXPORT_SYMBOL(strnlen_user);
1203
1204 long __strncpy_from_user(char *dst, const char __user *src, long count)
1205 {
1206         long res;
1207
1208         if (count == 0)
1209                 return 0;
1210
1211         /*
1212          * Currently, in 2.4.0-test9, most ports use a simple byte-copy loop.
1213          *  So do we.
1214          *
1215          *  This code is deduced from:
1216          *
1217          *      char tmp2;
1218          *      long tmp1, tmp3;
1219          *      tmp1 = count;
1220          *      while ((*dst++ = (tmp2 = *src++)) != 0
1221          *             && --tmp1)
1222          *        ;
1223          *
1224          *      res = count - tmp1;
1225          *
1226          *  with tweaks.
1227          */
1228
1229         asm volatile (" MOV  %0,%3\n"
1230                       "1:\n"
1231                       " GETB D0FrT,[%2++]\n"
1232                       "2:\n"
1233                       " CMP  D0FrT,#0\n"
1234                       " SETB [%1++],D0FrT\n"
1235                       " BEQ  3f\n"
1236                       " SUBS %0,%0,#1\n"
1237                       " BNZ  1b\n"
1238                       "3:\n"
1239                       " SUB  %0,%3,%0\n"
1240                       "4:\n"
1241                       " .section .fixup,\"ax\"\n"
1242                       "5:\n"
1243                       " MOV  %0,%7\n"
1244                       " MOVT    D0FrT,#HI(4b)\n"
1245                       " JUMP    D0FrT,#LO(4b)\n"
1246                       " .previous\n"
1247                       " .section __ex_table,\"a\"\n"
1248                       " .long 2b,5b\n"
1249                       " .previous"
1250                       : "=r" (res), "=r" (dst), "=r" (src), "=r" (count)
1251                       : "3" (count), "1" (dst), "2" (src), "P" (-EFAULT)
1252                       : "D0FrT", "memory", "cc");
1253
1254         return res;
1255 }
1256 EXPORT_SYMBOL(__strncpy_from_user);