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                 "       MOV D1Ar1,#0\n"                          \
  33                 FIXUP                                            \
  34                 "       MOVT    D1Ar1,#HI(1b)\n"                 \
  35                 "       JUMP    D1Ar1,#LO(1b)\n"                 \
  36                 "       .previous\n"                             \
  37                 "       .section __ex_table,\"a\"\n"             \
  38                 TENTRY                                           \
  39                 "       .previous\n"                             \
  40                 : "=r" (to), "=r" (from), "=r" (ret)             \
  41                 : "0" (to), "1" (from), "2" (ret)                \
  42                 : "D1Ar1", "memory")
  43
  44
  45 #define __asm_copy_to_user_1(to, from, ret)     \
  46         __asm_copy_user_cont(to, from, ret,     \
  47                 "       GETB D1Ar1,[%1++]\n"    \
  48                 "       SETB [%0],D1Ar1\n"      \
  49                 "2:     SETB [%0++],D1Ar1\n",   \
  50                 "3:     ADD  %2,%2,#1\n",       \
  51                 "       .long 2b,3b\n")
  52
  53 #define __asm_copy_to_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
  54         __asm_copy_user_cont(to, from, ret,             \
  55                 "       GETW D1Ar1,[%1++]\n"            \
  56                 "       SETW [%0],D1Ar1\n"              \
  57                 "2:     SETW [%0++],D1Ar1\n" COPY,      \
  58                 "3:     ADD  %2,%2,#2\n" FIXUP,         \
  59                 "       .long 2b,3b\n" TENTRY)
  60
  61 #define __asm_copy_to_user_2(to, from, ret) \
  62         __asm_copy_to_user_2x_cont(to, from, ret, "", "", "")
  63
  64 #define __asm_copy_to_user_3(to, from, ret) \
  65         __asm_copy_to_user_2x_cont(to, from, ret,       \
  66                 "       GETB D1Ar1,[%1++]\n"            \
  67                 "       SETB [%0],D1Ar1\n"              \
  68                 "4:     SETB [%0++],D1Ar1\n",           \
  69                 "5:     ADD  %2,%2,#1\n",               \
  70                 "       .long 4b,5b\n")
  71
  72 #define __asm_copy_to_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
  73         __asm_copy_user_cont(to, from, ret,             \
  74                 "       GETD D1Ar1,[%1++]\n"            \
  75                 "       SETD [%0],D1Ar1\n"              \
  76                 "2:     SETD [%0++],D1Ar1\n" COPY,      \
  77                 "3:     ADD  %2,%2,#4\n" FIXUP,         \
  78                 "       .long 2b,3b\n" TENTRY)
  79
  80 #define __asm_copy_to_user_4(to, from, ret) \
  81         __asm_copy_to_user_4x_cont(to, from, ret, "", "", "")
  82
  83 #define __asm_copy_to_user_5(to, from, ret) \
  84         __asm_copy_to_user_4x_cont(to, from, ret,       \
  85                 "       GETB D1Ar1,[%1++]\n"            \
  86                 "       SETB [%0],D1Ar1\n"              \
  87                 "4:     SETB [%0++],D1Ar1\n",           \
  88                 "5:     ADD  %2,%2,#1\n",               \
  89                 "       .long 4b,5b\n")
  90
  91 #define __asm_copy_to_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
  92         __asm_copy_to_user_4x_cont(to, from, ret,       \
  93                 "       GETW D1Ar1,[%1++]\n"            \
  94                 "       SETW [%0],D1Ar1\n"              \
  95                 "4:     SETW [%0++],D1Ar1\n" COPY,      \
  96                 "5:     ADD  %2,%2,#2\n" FIXUP,         \
  97                 "       .long 4b,5b\n" TENTRY)
  98
  99 #define __asm_copy_to_user_6(to, from, ret) \
 100         __asm_copy_to_user_6x_cont(to, from, ret, "", "", "")
 101
 102 #define __asm_copy_to_user_7(to, from, ret) \
 103         __asm_copy_to_user_6x_cont(to, from, ret,       \
 104                 "       GETB D1Ar1,[%1++]\n"            \
 105                 "       SETB [%0],D1Ar1\n"              \
 106                 "6:     SETB [%0++],D1Ar1\n",           \
 107                 "7:     ADD  %2,%2,#1\n",               \
 108                 "       .long 6b,7b\n")
 109
 110 #define __asm_copy_to_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 111         __asm_copy_to_user_4x_cont(to, from, ret,       \
 112                 "       GETD D1Ar1,[%1++]\n"            \
 113                 "       SETD [%0],D1Ar1\n"              \
 114                 "4:     SETD [%0++],D1Ar1\n" COPY,      \
 115                 "5:     ADD  %2,%2,#4\n"  FIXUP,        \
 116                 "       .long 4b,5b\n" TENTRY)
 117
 118 #define __asm_copy_to_user_8(to, from, ret) \
 119         __asm_copy_to_user_8x_cont(to, from, ret, "", "", "")
 120
 121 #define __asm_copy_to_user_9(to, from, ret) \
 122         __asm_copy_to_user_8x_cont(to, from, ret,       \
 123                 "       GETB D1Ar1,[%1++]\n"            \
 124                 "       SETB [%0],D1Ar1\n"              \
 125                 "6:     SETB [%0++],D1Ar1\n",           \
 126                 "7:     ADD  %2,%2,#1\n",               \
 127                 "       .long 6b,7b\n")
 128
 129 #define __asm_copy_to_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 130         __asm_copy_to_user_8x_cont(to, from, ret,       \
 131                 "       GETW D1Ar1,[%1++]\n"            \
 132                 "       SETW [%0],D1Ar1\n"              \
 133                 "6:     SETW [%0++],D1Ar1\n" COPY,      \
 134                 "7:     ADD  %2,%2,#2\n" FIXUP,         \
 135                 "       .long 6b,7b\n" TENTRY)
 136
 137 #define __asm_copy_to_user_10(to, from, ret) \
 138         __asm_copy_to_user_10x_cont(to, from, ret, "", "", "")
 139
 140 #define __asm_copy_to_user_11(to, from, ret) \
 141         __asm_copy_to_user_10x_cont(to, from, ret,      \
 142                 "       GETB D1Ar1,[%1++]\n"            \
 143                 "       SETB [%0],D1Ar1\n"              \
 144                 "8:     SETB [%0++],D1Ar1\n",           \
 145                 "9:     ADD  %2,%2,#1\n",               \
 146                 "       .long 8b,9b\n")
 147
 148 #define __asm_copy_to_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 149         __asm_copy_to_user_8x_cont(to, from, ret,       \
 150                 "       GETD D1Ar1,[%1++]\n"            \
 151                 "       SETD [%0],D1Ar1\n"              \
 152                 "6:     SETD [%0++],D1Ar1\n" COPY,      \
 153                 "7:     ADD  %2,%2,#4\n" FIXUP,         \
 154                 "       .long 6b,7b\n" TENTRY)
 155 #define __asm_copy_to_user_12(to, from, ret) \
 156         __asm_copy_to_user_12x_cont(to, from, ret, "", "", "")
 157
 158 #define __asm_copy_to_user_13(to, from, ret) \
 159         __asm_copy_to_user_12x_cont(to, from, ret,      \
 160                 "       GETB D1Ar1,[%1++]\n"            \
 161                 "       SETB [%0],D1Ar1\n"              \
 162                 "8:     SETB [%0++],D1Ar1\n",           \
 163                 "9:     ADD  %2,%2,#1\n",               \
 164                 "       .long 8b,9b\n")
 165
 166 #define __asm_copy_to_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 167         __asm_copy_to_user_12x_cont(to, from, ret,      \
 168                 "       GETW D1Ar1,[%1++]\n"            \
 169                 "       SETW [%0],D1Ar1\n"              \
 170                 "8:     SETW [%0++],D1Ar1\n" COPY,      \
 171                 "9:     ADD  %2,%2,#2\n" FIXUP,         \
 172                 "       .long 8b,9b\n" TENTRY)
 173
 174 #define __asm_copy_to_user_14(to, from, ret) \
 175         __asm_copy_to_user_14x_cont(to, from, ret, "", "", "")
 176
 177 #define __asm_copy_to_user_15(to, from, ret) \
 178         __asm_copy_to_user_14x_cont(to, from, ret,      \
 179                 "       GETB D1Ar1,[%1++]\n"            \
 180                 "       SETB [%0],D1Ar1\n"              \
 181                 "10:    SETB [%0++],D1Ar1\n",           \
 182                 "11:    ADD  %2,%2,#1\n",               \
 183                 "       .long 10b,11b\n")
 184
 185 #define __asm_copy_to_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 186         __asm_copy_to_user_12x_cont(to, from, ret,      \
 187                 "       GETD D1Ar1,[%1++]\n"            \
 188                 "       SETD [%0],D1Ar1\n"              \
 189                 "8:     SETD [%0++],D1Ar1\n" COPY,      \
 190                 "9:     ADD  %2,%2,#4\n" FIXUP,         \
 191                 "       .long 8b,9b\n" TENTRY)
 192
 193 #define __asm_copy_to_user_16(to, from, ret) \
 194                 __asm_copy_to_user_16x_cont(to, from, ret, "", "", "")
 195
 196 #define __asm_copy_to_user_8x64(to, from, ret) \
 197         asm volatile (                                  \
 198                 "       GETL D0Ar2,D1Ar1,[%1++]\n"      \
 199                 "       SETL [%0],D0Ar2,D1Ar1\n"        \
 200                 "2:     SETL [%0++],D0Ar2,D1Ar1\n"      \
 201                 "1:\n"                                  \
 202                 "       .section .fixup,\"ax\"\n"       \
 203                 "3:     ADD  %2,%2,#8\n"                \
 204                 "       MOVT    D0Ar2,#HI(1b)\n"        \
 205                 "       JUMP    D0Ar2,#LO(1b)\n"        \
 206                 "       .previous\n"                    \
 207                 "       .section __ex_table,\"a\"\n"    \
 208                 "       .long 2b,3b\n"                  \
 209                 "       .previous\n"                    \
 210                 : "=r" (to), "=r" (from), "=r" (ret)    \
 211                 : "0" (to), "1" (from), "2" (ret)       \
 212                 : "D1Ar1", "D0Ar2", "memory")
 213
 214 /*
 215  *      optimized copying loop using RAPF when 64 bit aligned
 216  *
 217  *      n               will be automatically decremented inside the loop
 218  *      ret             will be left intact. if error occurs we will rewind
 219  *                      so that the original non optimized code will fill up
 220  *                      this value correctly.
 221  *
 222  *      on fault:
 223  *              >       n will hold total number of uncopied bytes
 224  *
 225  *              >       {'to','from'} will be rewind back so that
 226  *                      the non-optimized code will do the proper fix up
 227  *
 228  *      DCACHE drops the cacheline which helps in reducing cache
 229  *      pollution.
 230  *
 231  *      We introduce an extra SETL at the end of the loop to
 232  *      ensure we don't fall off the loop before we catch all
 233  *      erros.
 234  *
 235  *      NOTICE:
 236  *              LSM_STEP in TXSTATUS must be cleared in fix up code.
 237  *              since we're using M{S,G}ETL, a fault might happen at
 238  *              any address in the middle of M{S,G}ETL causing
 239  *              the value of LSM_STEP to be incorrect which can
 240  *              cause subsequent use of M{S,G}ET{L,D} to go wrong.
 241  *              ie: if LSM_STEP was 1 when a fault occurs, the
 242  *              next call to M{S,G}ET{L,D} will skip the first
 243  *              copy/getting as it think that the first 1 has already
 244  *              been done.
 245  *
 246  */
 247 #define __asm_copy_user_64bit_rapf_loop(                                \
 248                 to, from, ret, n, id, FIXUP)                            \
 249         asm volatile (                                                  \
 250                 ".balign 8\n"                                           \
 251                 "MOV    RAPF, %1\n"                                     \
 252                 "MSETL  [A0StP++], D0Ar6, D0FrT, D0.5, D0.6, D0.7\n"    \
 253                 "MOV    D0Ar6, #0\n"                                    \
 254                 "LSR    D1Ar5, %3, #6\n"                                \
 255                 "SUB    TXRPT, D1Ar5, #2\n"                             \
 256                 "MOV    RAPF, %1\n"                                     \
 257                 "$Lloop"id":\n"                                         \
 258                 "ADD    RAPF, %1, #64\n"                                \
 259                 "21:\n"                                                 \
 260                 "MGETL  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 261                 "22:\n"                                                 \
 262                 "MSETL  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 263                 "SUB    %3, %3, #32\n"                                  \
 264                 "23:\n"                                                 \
 265                 "MGETL  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 266                 "24:\n"                                                 \
 267                 "MSETL  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 268                 "SUB    %3, %3, #32\n"                                  \
 269                 "DCACHE [%1+#-64], D0Ar6\n"                             \
 270                 "BR     $Lloop"id"\n"                                   \
 271                                                                         \
 272                 "MOV    RAPF, %1\n"                                     \
 273                 "25:\n"                                                 \
 274                 "MGETL  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 275                 "26:\n"                                                 \
 276                 "MSETL  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 277                 "SUB    %3, %3, #32\n"                                  \
 278                 "27:\n"                                                 \
 279                 "MGETL  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 280                 "28:\n"                                                 \
 281                 "MSETL  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 282                 "SUB    %0, %0, #8\n"                                   \
 283                 "29:\n"                                                 \
 284                 "SETL   [%0++], D0.7, D1.7\n"                           \
 285                 "SUB    %3, %3, #32\n"                                  \
 286                 "1:"                                                    \
 287                 "DCACHE [%1+#-64], D0Ar6\n"                             \
 288                 "GETL    D0Ar6, D1Ar5, [A0StP+#-40]\n"                  \
 289                 "GETL    D0FrT, D1RtP, [A0StP+#-32]\n"                  \
 290                 "GETL    D0.5, D1.5, [A0StP+#-24]\n"                    \
 291                 "GETL    D0.6, D1.6, [A0StP+#-16]\n"                    \
 292                 "GETL    D0.7, D1.7, [A0StP+#-8]\n"                     \
 293                 "SUB A0StP, A0StP, #40\n"                               \
 294                 "       .section .fixup,\"ax\"\n"                       \
 295                 "4:\n"                                                  \
 296                 "       ADD     %0, %0, #8\n"                           \
 297                 "3:\n"                                                  \
 298                 "       MOV     D0Ar2, TXSTATUS\n"                      \
 299                 "       MOV     D1Ar1, TXSTATUS\n"                      \
 300                 "       AND     D1Ar1, D1Ar1, #0xFFFFF8FF\n"            \
 301                 "       MOV     TXSTATUS, D1Ar1\n"                      \
 302                         FIXUP                                           \
 303                 "       MOVT    D0Ar2,#HI(1b)\n"                        \
 304                 "       JUMP    D0Ar2,#LO(1b)\n"                        \
 305                 "       .previous\n"                                    \
 306                 "       .section __ex_table,\"a\"\n"                    \
 307                 "       .long 21b,3b\n"                                 \
 308                 "       .long 22b,3b\n"                                 \
 309                 "       .long 23b,3b\n"                                 \
 310                 "       .long 24b,3b\n"                                 \
 311                 "       .long 25b,3b\n"                                 \
 312                 "       .long 26b,3b\n"                                 \
 313                 "       .long 27b,3b\n"                                 \
 314                 "       .long 28b,3b\n"                                 \
 315                 "       .long 29b,4b\n"                                 \
 316                 "       .previous\n"                                    \
 317                 : "=r" (to), "=r" (from), "=r" (ret), "=d" (n)          \
 318                 : "0" (to), "1" (from), "2" (ret), "3" (n)              \
 319                 : "D1Ar1", "D0Ar2", "memory")
 320
 321 /*      rewind 'to' and 'from'  pointers when a fault occurs
 322  *
 323  *      Rationale:
 324  *              A fault always occurs on writing to user buffer. A fault
 325  *              is at a single address, so we need to rewind by only 4
 326  *              bytes.
 327  *              Since we do a complete read from kernel buffer before
 328  *              writing, we need to rewind it also. The amount to be
 329  *              rewind equals the number of faulty writes in MSETD
 330  *              which is: [4 - (LSM_STEP-1)]*8
 331  *              LSM_STEP is bits 10:8 in TXSTATUS which is already read
 332  *              and stored in D0Ar2
 333  *
 334  *              NOTE: If a fault occurs at the last operation in M{G,S}ETL
 335  *                      LSM_STEP will be 0. ie: we do 4 writes in our case, if
 336  *                      a fault happens at the 4th write, LSM_STEP will be 0
 337  *                      instead of 4. The code copes with that.
 338  *
 339  *              n is updated by the number of successful writes, which is:
 340  *              n = n - (LSM_STEP-1)*8
 341  */
 342 #define __asm_copy_to_user_64bit_rapf_loop(to,  from, ret, n, id)\
 343         __asm_copy_user_64bit_rapf_loop(to, from, ret, n, id,           \
 344                 "LSR    D0Ar2, D0Ar2, #8\n"                             \
 345                 "AND    D0Ar2, D0Ar2, #0x7\n"                           \
 346                 "ADDZ   D0Ar2, D0Ar2, #4\n"                             \
 347                 "SUB    D0Ar2, D0Ar2, #1\n"                             \
 348                 "MOV    D1Ar1, #4\n"                                    \
 349                 "SUB    D0Ar2, D1Ar1, D0Ar2\n"                          \
 350                 "LSL    D0Ar2, D0Ar2, #3\n"                             \
 351                 "LSL    D1Ar1, D1Ar1, #3\n"                             \
 352                 "SUB    D1Ar1, D1Ar1, D0Ar2\n"                          \
 353                 "SUB    %0, %0, #8\n"                                   \
 354                 "SUB    %1,     %1,D0Ar2\n"                             \
 355                 "SUB    %3, %3, D1Ar1\n")
 356
 357 /*
 358  *      optimized copying loop using RAPF when 32 bit aligned
 359  *
 360  *      n               will be automatically decremented inside the loop
 361  *      ret             will be left intact. if error occurs we will rewind
 362  *                      so that the original non optimized code will fill up
 363  *                      this value correctly.
 364  *
 365  *      on fault:
 366  *              >       n will hold total number of uncopied bytes
 367  *
 368  *              >       {'to','from'} will be rewind back so that
 369  *                      the non-optimized code will do the proper fix up
 370  *
 371  *      DCACHE drops the cacheline which helps in reducing cache
 372  *      pollution.
 373  *
 374  *      We introduce an extra SETD at the end of the loop to
 375  *      ensure we don't fall off the loop before we catch all
 376  *      erros.
 377  *
 378  *      NOTICE:
 379  *              LSM_STEP in TXSTATUS must be cleared in fix up code.
 380  *              since we're using M{S,G}ETL, a fault might happen at
 381  *              any address in the middle of M{S,G}ETL causing
 382  *              the value of LSM_STEP to be incorrect which can
 383  *              cause subsequent use of M{S,G}ET{L,D} to go wrong.
 384  *              ie: if LSM_STEP was 1 when a fault occurs, the
 385  *              next call to M{S,G}ET{L,D} will skip the first
 386  *              copy/getting as it think that the first 1 has already
 387  *              been done.
 388  *
 389  */
 390 #define __asm_copy_user_32bit_rapf_loop(                                \
 391                         to,     from, ret, n, id, FIXUP)                \
 392         asm volatile (                                                  \
 393                 ".balign 8\n"                                           \
 394                 "MOV    RAPF, %1\n"                                     \
 395                 "MSETL  [A0StP++], D0Ar6, D0FrT, D0.5, D0.6, D0.7\n"    \
 396                 "MOV    D0Ar6, #0\n"                                    \
 397                 "LSR    D1Ar5, %3, #6\n"                                \
 398                 "SUB    TXRPT, D1Ar5, #2\n"                             \
 399                 "MOV    RAPF, %1\n"                                     \
 400         "$Lloop"id":\n"                                                 \
 401                 "ADD    RAPF, %1, #64\n"                                \
 402                 "21:\n"                                                 \
 403                 "MGETD  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 404                 "22:\n"                                                 \
 405                 "MSETD  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 406                 "SUB    %3, %3, #16\n"                                  \
 407                 "23:\n"                                                 \
 408                 "MGETD  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 409                 "24:\n"                                                 \
 410                 "MSETD  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 411                 "SUB    %3, %3, #16\n"                                  \
 412                 "25:\n"                                                 \
 413                 "MGETD  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 414                 "26:\n"                                                 \
 415                 "MSETD  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 416                 "SUB    %3, %3, #16\n"                                  \
 417                 "27:\n"                                                 \
 418                 "MGETD  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 419                 "28:\n"                                                 \
 420                 "MSETD  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 421                 "SUB    %3, %3, #16\n"                                  \
 422                 "DCACHE [%1+#-64], D0Ar6\n"                             \
 423                 "BR     $Lloop"id"\n"                                   \
 424                                                                         \
 425                 "MOV    RAPF, %1\n"                                     \
 426                 "29:\n"                                                 \
 427                 "MGETD  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 428                 "30:\n"                                                 \
 429                 "MSETD  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 430                 "SUB    %3, %3, #16\n"                                  \
 431                 "31:\n"                                                 \
 432                 "MGETD  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 433                 "32:\n"                                                 \
 434                 "MSETD  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 435                 "SUB    %3, %3, #16\n"                                  \
 436                 "33:\n"                                                 \
 437                 "MGETD  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 438                 "34:\n"                                                 \
 439                 "MSETD  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 440                 "SUB    %3, %3, #16\n"                                  \
 441                 "35:\n"                                                 \
 442                 "MGETD  D0FrT, D0.5, D0.6, D0.7, [%1++]\n"              \
 443                 "36:\n"                                                 \
 444                 "MSETD  [%0++], D0FrT, D0.5, D0.6, D0.7\n"              \
 445                 "SUB    %0, %0, #4\n"                                   \
 446                 "37:\n"                                                 \
 447                 "SETD   [%0++], D0.7\n"                                 \
 448                 "SUB    %3, %3, #16\n"                                  \
 449                 "1:"                                                    \
 450                 "DCACHE [%1+#-64], D0Ar6\n"                             \
 451                 "GETL    D0Ar6, D1Ar5, [A0StP+#-40]\n"                  \
 452                 "GETL    D0FrT, D1RtP, [A0StP+#-32]\n"                  \
 453                 "GETL    D0.5, D1.5, [A0StP+#-24]\n"                    \
 454                 "GETL    D0.6, D1.6, [A0StP+#-16]\n"                    \
 455                 "GETL    D0.7, D1.7, [A0StP+#-8]\n"                     \
 456                 "SUB A0StP, A0StP, #40\n"                               \
 457                 "       .section .fixup,\"ax\"\n"                       \
 458                 "4:\n"                                                  \
 459                 "       ADD             %0, %0, #4\n"                   \
 460                 "3:\n"                                                  \
 461                 "       MOV     D0Ar2, TXSTATUS\n"                      \
 462                 "       MOV     D1Ar1, TXSTATUS\n"                      \
 463                 "       AND     D1Ar1, D1Ar1, #0xFFFFF8FF\n"            \
 464                 "       MOV     TXSTATUS, D1Ar1\n"                      \
 465                         FIXUP                                           \
 466                 "       MOVT    D0Ar2,#HI(1b)\n"                        \
 467                 "       JUMP    D0Ar2,#LO(1b)\n"                        \
 468                 "       .previous\n"                                    \
 469                 "       .section __ex_table,\"a\"\n"                    \
 470                 "       .long 21b,3b\n"                                 \
 471                 "       .long 22b,3b\n"                                 \
 472                 "       .long 23b,3b\n"                                 \
 473                 "       .long 24b,3b\n"                                 \
 474                 "       .long 25b,3b\n"                                 \
 475                 "       .long 26b,3b\n"                                 \
 476                 "       .long 27b,3b\n"                                 \
 477                 "       .long 28b,3b\n"                                 \
 478                 "       .long 29b,3b\n"                                 \
 479                 "       .long 30b,3b\n"                                 \
 480                 "       .long 31b,3b\n"                                 \
 481                 "       .long 32b,3b\n"                                 \
 482                 "       .long 33b,3b\n"                                 \
 483                 "       .long 34b,3b\n"                                 \
 484                 "       .long 35b,3b\n"                                 \
 485                 "       .long 36b,3b\n"                                 \
 486                 "       .long 37b,4b\n"                                 \
 487                 "       .previous\n"                                    \
 488                 : "=r" (to), "=r" (from), "=r" (ret), "=d" (n)          \
 489                 : "0" (to), "1" (from), "2" (ret), "3" (n)              \
 490                 : "D1Ar1", "D0Ar2", "memory")
 491
 492 /*      rewind 'to' and 'from'  pointers when a fault occurs
 493  *
 494  *      Rationale:
 495  *              A fault always occurs on writing to user buffer. A fault
 496  *              is at a single address, so we need to rewind by only 4
 497  *              bytes.
 498  *              Since we do a complete read from kernel buffer before
 499  *              writing, we need to rewind it also. The amount to be
 500  *              rewind equals the number of faulty writes in MSETD
 501  *              which is: [4 - (LSM_STEP-1)]*4
 502  *              LSM_STEP is bits 10:8 in TXSTATUS which is already read
 503  *              and stored in D0Ar2
 504  *
 505  *              NOTE: If a fault occurs at the last operation in M{G,S}ETL
 506  *                      LSM_STEP will be 0. ie: we do 4 writes in our case, if
 507  *                      a fault happens at the 4th write, LSM_STEP will be 0
 508  *                      instead of 4. The code copes with that.
 509  *
 510  *              n is updated by the number of successful writes, which is:
 511  *              n = n - (LSM_STEP-1)*4
 512  */
 513 #define __asm_copy_to_user_32bit_rapf_loop(to, from, ret, n, id)\
 514         __asm_copy_user_32bit_rapf_loop(to, from, ret, n, id,           \
 515                 "LSR    D0Ar2, D0Ar2, #8\n"                             \
 516                 "AND    D0Ar2, D0Ar2, #0x7\n"                           \
 517                 "ADDZ   D0Ar2, D0Ar2, #4\n"                             \
 518                 "SUB    D0Ar2, D0Ar2, #1\n"                             \
 519                 "MOV    D1Ar1, #4\n"                                    \
 520                 "SUB    D0Ar2, D1Ar1, D0Ar2\n"                          \
 521                 "LSL    D0Ar2, D0Ar2, #2\n"                             \
 522                 "LSL    D1Ar1, D1Ar1, #2\n"                             \
 523                 "SUB    D1Ar1, D1Ar1, D0Ar2\n"                          \
 524                 "SUB    %0, %0, #4\n"                                   \
 525                 "SUB    %1,     %1,     D0Ar2\n"                        \
 526                 "SUB    %3, %3, D1Ar1\n")
 527
 528 unsigned long __copy_user(void __user *pdst, const void *psrc,
 529                           unsigned long n)
 530 {
 531         register char __user *dst asm ("A0.2") = pdst;
 532         register const char *src asm ("A1.2") = psrc;
 533         unsigned long retn = 0;
 534
 535         if (n == 0)
 536                 return 0;
 537
 538         if ((unsigned long) src & 1) {
 539                 __asm_copy_to_user_1(dst, src, retn);
 540                 n--;
 541                 if (retn)
 542                         return retn + n;
 543         }
 544         if ((unsigned long) dst & 1) {
 545                 /* Worst case - byte copy */
 546                 while (n > 0) {
 547                         __asm_copy_to_user_1(dst, src, retn);
 548                         n--;
 549                         if (retn)
 550                                 return retn + n;
 551                 }
 552         }
 553         if (((unsigned long) src & 2) && n >= 2) {
 554                 __asm_copy_to_user_2(dst, src, retn);
 555                 n -= 2;
 556                 if (retn)
 557                         return retn + n;
 558         }
 559         if ((unsigned long) dst & 2) {
 560                 /* Second worst case - word copy */
 561                 while (n >= 2) {
 562                         __asm_copy_to_user_2(dst, src, retn);
 563                         n -= 2;
 564                         if (retn)
 565                                 return retn + n;
 566                 }
 567         }
 568
 569 #ifdef USE_RAPF
 570         /* 64 bit copy loop */
 571         if (!(((unsigned long) src | (__force unsigned long) dst) & 7)) {
 572                 if (n >= RAPF_MIN_BUF_SIZE) {
 573                         /* copy user using 64 bit rapf copy */
 574                         __asm_copy_to_user_64bit_rapf_loop(dst, src, retn,
 575                                                         n, "64cu");
 576                 }
 577                 while (n >= 8) {
 578                         __asm_copy_to_user_8x64(dst, src, retn);
 579                         n -= 8;
 580                         if (retn)
 581                                 return retn + n;
 582                 }
 583         }
 584         if (n >= RAPF_MIN_BUF_SIZE) {
 585                 /* copy user using 32 bit rapf copy */
 586                 __asm_copy_to_user_32bit_rapf_loop(dst, src, retn, n, "32cu");
 587         }
 588 #else
 589         /* 64 bit copy loop */
 590         if (!(((unsigned long) src | (__force unsigned long) dst) & 7)) {
 591                 while (n >= 8) {
 592                         __asm_copy_to_user_8x64(dst, src, retn);
 593                         n -= 8;
 594                         if (retn)
 595                                 return retn + n;
 596                 }
 597         }
 598 #endif
 599
 600         while (n >= 16) {
 601                 __asm_copy_to_user_16(dst, src, retn);
 602                 n -= 16;
 603                 if (retn)
 604                         return retn + n;
 605         }
 606
 607         while (n >= 4) {
 608                 __asm_copy_to_user_4(dst, src, retn);
 609                 n -= 4;
 610                 if (retn)
 611                         return retn + n;
 612         }
 613
 614         switch (n) {
 615         case 0:
 616                 break;
 617         case 1:
 618                 __asm_copy_to_user_1(dst, src, retn);
 619                 break;
 620         case 2:
 621                 __asm_copy_to_user_2(dst, src, retn);
 622                 break;
 623         case 3:
 624                 __asm_copy_to_user_3(dst, src, retn);
 625                 break;
 626         }
 627
 628         /*
 629          * If we get here, retn correctly reflects the number of failing
 630          * bytes.
 631          */
 632         return retn;
 633 }
 634 EXPORT_SYMBOL(__copy_user);
 635
 636 #define __asm_copy_from_user_1(to, from, ret) \
 637         __asm_copy_user_cont(to, from, ret,     \
 638                 "       GETB D1Ar1,[%1++]\n"    \
 639                 "2:     SETB [%0++],D1Ar1\n",   \
 640                 "3:     ADD  %2,%2,#1\n"        \
 641                 "       SETB [%0++],D1Ar1\n",   \
 642                 "       .long 2b,3b\n")
 643
 644 #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 645         __asm_copy_user_cont(to, from, ret,             \
 646                 "       GETW D1Ar1,[%1++]\n"            \
 647                 "2:     SETW [%0++],D1Ar1\n" COPY,      \
 648                 "3:     ADD  %2,%2,#2\n"                \
 649                 "       SETW [%0++],D1Ar1\n" FIXUP,     \
 650                 "       .long 2b,3b\n" TENTRY)
 651
 652 #define __asm_copy_from_user_2(to, from, ret) \
 653         __asm_copy_from_user_2x_cont(to, from, ret, "", "", "")
 654
 655 #define __asm_copy_from_user_3(to, from, ret)           \
 656         __asm_copy_from_user_2x_cont(to, from, ret,     \
 657                 "       GETB D1Ar1,[%1++]\n"            \
 658                 "4:     SETB [%0++],D1Ar1\n",           \
 659                 "5:     ADD  %2,%2,#1\n"                \
 660                 "       SETB [%0++],D1Ar1\n",           \
 661                 "       .long 4b,5b\n")
 662
 663 #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 664         __asm_copy_user_cont(to, from, ret,             \
 665                 "       GETD D1Ar1,[%1++]\n"            \
 666                 "2:     SETD [%0++],D1Ar1\n" COPY,      \
 667                 "3:     ADD  %2,%2,#4\n"                \
 668                 "       SETD [%0++],D1Ar1\n" FIXUP,     \
 669                 "       .long 2b,3b\n" TENTRY)
 670
 671 #define __asm_copy_from_user_4(to, from, ret) \
 672         __asm_copy_from_user_4x_cont(to, from, ret, "", "", "")
 673
 674
 675 #define __asm_copy_from_user_8x64(to, from, ret) \
 676         asm volatile (                          \
 677                 "       GETL D0Ar2,D1Ar1,[%1++]\n"      \
 678                 "2:     SETL [%0++],D0Ar2,D1Ar1\n"      \
 679                 "1:\n"                                  \
 680                 "       .section .fixup,\"ax\"\n"       \
 681                 "       MOV D1Ar1,#0\n"                 \
 682                 "       MOV D0Ar2,#0\n"                 \
 683                 "3:     ADD  %2,%2,#8\n"                \
 684                 "       SETL [%0++],D0Ar2,D1Ar1\n"      \
 685                 "       MOVT    D0Ar2,#HI(1b)\n"        \
 686                 "       JUMP    D0Ar2,#LO(1b)\n"        \
 687                 "       .previous\n"                    \
 688                 "       .section __ex_table,\"a\"\n"    \
 689                 "       .long 2b,3b\n"                  \
 690                 "       .previous\n"                    \
 691                 : "=a" (to), "=r" (from), "=r" (ret)    \
 692                 : "0" (to), "1" (from), "2" (ret)       \
 693                 : "D1Ar1", "D0Ar2", "memory")
 694
 695 /*      rewind 'from' pointer when a fault occurs
 696  *
 697  *      Rationale:
 698  *              A fault occurs while reading from user buffer, which is the
 699  *              source. Since the fault is at a single address, we only
 700  *              need to rewind by 8 bytes.
 701  *              Since we don't write to kernel buffer until we read first,
 702  *              the kernel buffer is at the right state and needn't be
 703  *              corrected.
 704  */
 705 #define __asm_copy_from_user_64bit_rapf_loop(to, from, ret, n, id)      \
 706         __asm_copy_user_64bit_rapf_loop(to, from, ret, n, id,           \
 707                 "SUB    %1, %1, #8\n")
 708
 709 /*      rewind 'from' pointer when a fault occurs
 710  *
 711  *      Rationale:
 712  *              A fault occurs while reading from user buffer, which is the
 713  *              source. Since the fault is at a single address, we only
 714  *              need to rewind by 4 bytes.
 715  *              Since we don't write to kernel buffer until we read first,
 716  *              the kernel buffer is at the right state and needn't be
 717  *              corrected.
 718  */
 719 #define __asm_copy_from_user_32bit_rapf_loop(to, from, ret, n, id)      \
 720         __asm_copy_user_32bit_rapf_loop(to, from, ret, n, id,           \
 721                 "SUB    %1, %1, #4\n")
 722
 723
 724 /* Copy from user to kernel, zeroing the bytes that were inaccessible in
 725    userland.  The return-value is the number of bytes that were
 726    inaccessible.  */
 727 unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
 728                                   unsigned long n)
 729 {
 730         register char *dst asm ("A0.2") = pdst;
 731         register const char __user *src asm ("A1.2") = psrc;
 732         unsigned long retn = 0;
 733
 734         if (n == 0)
 735                 return 0;
 736
 737         if ((unsigned long) src & 1) {
 738                 __asm_copy_from_user_1(dst, src, retn);
 739                 n--;
 740                 if (retn)
 741                         goto copy_exception_bytes;
 742         }
 743         if ((unsigned long) dst & 1) {
 744                 /* Worst case - byte copy */
 745                 while (n > 0) {
 746                         __asm_copy_from_user_1(dst, src, retn);
 747                         n--;
 748                         if (retn)
 749                                 goto copy_exception_bytes;
 750                 }
 751         }
 752         if (((unsigned long) src & 2) && n >= 2) {
 753                 __asm_copy_from_user_2(dst, src, retn);
 754                 n -= 2;
 755                 if (retn)
 756                         goto copy_exception_bytes;
 757         }
 758         if ((unsigned long) dst & 2) {
 759                 /* Second worst case - word copy */
 760                 while (n >= 2) {
 761                         __asm_copy_from_user_2(dst, src, retn);
 762                         n -= 2;
 763                         if (retn)
 764                                 goto copy_exception_bytes;
 765                 }
 766         }
 767
 768 #ifdef USE_RAPF
 769         /* 64 bit copy loop */
 770         if (!(((unsigned long) src | (unsigned long) dst) & 7)) {
 771                 if (n >= RAPF_MIN_BUF_SIZE) {
 772                         /* Copy using fast 64bit rapf */
 773                         __asm_copy_from_user_64bit_rapf_loop(dst, src, retn,
 774                                                         n, "64cuz");
 775                 }
 776                 while (n >= 8) {
 777                         __asm_copy_from_user_8x64(dst, src, retn);
 778                         n -= 8;
 779                         if (retn)
 780                                 goto copy_exception_bytes;
 781                 }
 782         }
 783
 784         if (n >= RAPF_MIN_BUF_SIZE) {
 785                 /* Copy using fast 32bit rapf */
 786                 __asm_copy_from_user_32bit_rapf_loop(dst, src, retn,
 787                                                 n, "32cuz");
 788         }
 789 #else
 790         /* 64 bit copy loop */
 791         if (!(((unsigned long) src | (unsigned long) dst) & 7)) {
 792                 while (n >= 8) {
 793                         __asm_copy_from_user_8x64(dst, src, retn);
 794                         n -= 8;
 795                         if (retn)
 796                                 goto copy_exception_bytes;
 797                 }
 798         }
 799 #endif
 800
 801         while (n >= 4) {
 802                 __asm_copy_from_user_4(dst, src, retn);
 803                 n -= 4;
 804
 805                 if (retn)
 806                         goto copy_exception_bytes;
 807         }
 808
 809         /* If we get here, there were no memory read faults.  */
 810         switch (n) {
 811                 /* These copies are at least "naturally aligned" (so we don't
 812                    have to check each byte), due to the src alignment code.
 813                    The *_3 case *will* get the correct count for retn.  */
 814         case 0:
 815                 /* This case deliberately left in (if you have doubts check the
 816                    generated assembly code).  */
 817                 break;
 818         case 1:
 819                 __asm_copy_from_user_1(dst, src, retn);
 820                 break;
 821         case 2:
 822                 __asm_copy_from_user_2(dst, src, retn);
 823                 break;
 824         case 3:
 825                 __asm_copy_from_user_3(dst, src, retn);
 826                 break;
 827         }
 828
 829         /* If we get here, retn correctly reflects the number of failing
 830            bytes.  */
 831         return retn;
 832
 833  copy_exception_bytes:
 834         /* We already have "retn" bytes cleared, and need to clear the
 835            remaining "n" bytes.  A non-optimized simple byte-for-byte in-line
 836            memset is preferred here, since this isn't speed-critical code and
 837            we'd rather have this a leaf-function than calling memset.  */
 838         {
 839                 char *endp;
 840                 for (endp = dst + n; dst < endp; dst++)
 841                         *dst = 0;
 842         }
 843
 844         return retn + n;
 845 }
 846 EXPORT_SYMBOL(__copy_user_zeroing);
 847
 848 #define __asm_clear_8x64(to, ret) \
 849         asm volatile (                                  \
 850                 "       MOV  D0Ar2,#0\n"                \
 851                 "       MOV  D1Ar1,#0\n"                \
 852                 "       SETL [%0],D0Ar2,D1Ar1\n"        \
 853                 "2:     SETL [%0++],D0Ar2,D1Ar1\n"      \
 854                 "1:\n"                                  \
 855                 "       .section .fixup,\"ax\"\n"       \
 856                 "3:     ADD  %1,%1,#8\n"                \
 857                 "       MOVT    D0Ar2,#HI(1b)\n"        \
 858                 "       JUMP    D0Ar2,#LO(1b)\n"        \
 859                 "       .previous\n"                    \
 860                 "       .section __ex_table,\"a\"\n"    \
 861                 "       .long 2b,3b\n"                  \
 862                 "       .previous\n"                    \
 863                 : "=r" (to), "=r" (ret) \
 864                 : "0" (to), "1" (ret)   \
 865                 : "D1Ar1", "D0Ar2", "memory")
 866
 867 /* Zero userspace.  */
 868
 869 #define __asm_clear(to, ret, CLEAR, FIXUP, TENTRY) \
 870         asm volatile (                                  \
 871                 "       MOV D1Ar1,#0\n"                 \
 872                         CLEAR                           \
 873                 "1:\n"                                  \
 874                 "       .section .fixup,\"ax\"\n"       \
 875                         FIXUP                           \
 876                 "       MOVT    D1Ar1,#HI(1b)\n"        \
 877                 "       JUMP    D1Ar1,#LO(1b)\n"        \
 878                 "       .previous\n"                    \
 879                 "       .section __ex_table,\"a\"\n"    \
 880                         TENTRY                          \
 881                 "       .previous"                      \
 882                 : "=r" (to), "=r" (ret)                 \
 883                 : "0" (to), "1" (ret)                   \
 884                 : "D1Ar1", "memory")
 885
 886 #define __asm_clear_1(to, ret) \
 887         __asm_clear(to, ret,                    \
 888                 "       SETB [%0],D1Ar1\n"      \
 889                 "2:     SETB [%0++],D1Ar1\n",   \
 890                 "3:     ADD  %1,%1,#1\n",       \
 891                 "       .long 2b,3b\n")
 892
 893 #define __asm_clear_2(to, ret) \
 894         __asm_clear(to, ret,                    \
 895                 "       SETW [%0],D1Ar1\n"      \
 896                 "2:     SETW [%0++],D1Ar1\n",   \
 897                 "3:     ADD  %1,%1,#2\n",       \
 898                 "       .long 2b,3b\n")
 899
 900 #define __asm_clear_3(to, ret) \
 901         __asm_clear(to, ret,                    \
 902                  "2:    SETW [%0++],D1Ar1\n"    \
 903                  "      SETB [%0],D1Ar1\n"      \
 904                  "3:    SETB [%0++],D1Ar1\n",   \
 905                  "4:    ADD  %1,%1,#2\n"        \
 906                  "5:    ADD  %1,%1,#1\n",       \
 907                  "      .long 2b,4b\n"          \
 908                  "      .long 3b,5b\n")
 909
 910 #define __asm_clear_4x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 911         __asm_clear(to, ret,                            \
 912                 "       SETD [%0],D1Ar1\n"              \
 913                 "2:     SETD [%0++],D1Ar1\n" CLEAR,     \
 914                 "3:     ADD  %1,%1,#4\n" FIXUP,         \
 915                 "       .long 2b,3b\n" TENTRY)
 916
 917 #define __asm_clear_4(to, ret) \
 918         __asm_clear_4x_cont(to, ret, "", "", "")
 919
 920 #define __asm_clear_8x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 921         __asm_clear_4x_cont(to, ret,                    \
 922                 "       SETD [%0],D1Ar1\n"              \
 923                 "4:     SETD [%0++],D1Ar1\n" CLEAR,     \
 924                 "5:     ADD  %1,%1,#4\n" FIXUP,         \
 925                 "       .long 4b,5b\n" TENTRY)
 926
 927 #define __asm_clear_8(to, ret) \
 928         __asm_clear_8x_cont(to, ret, "", "", "")
 929
 930 #define __asm_clear_12x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 931         __asm_clear_8x_cont(to, ret,                    \
 932                 "       SETD [%0],D1Ar1\n"              \
 933                 "6:     SETD [%0++],D1Ar1\n" CLEAR,     \
 934                 "7:     ADD  %1,%1,#4\n" FIXUP,         \
 935                 "       .long 6b,7b\n" TENTRY)
 936
 937 #define __asm_clear_12(to, ret) \
 938         __asm_clear_12x_cont(to, ret, "", "", "")
 939
 940 #define __asm_clear_16x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
 941         __asm_clear_12x_cont(to, ret,                   \
 942                 "       SETD [%0],D1Ar1\n"              \
 943                 "8:     SETD [%0++],D1Ar1\n" CLEAR,     \
 944                 "9:     ADD  %1,%1,#4\n" FIXUP,         \
 945                 "       .long 8b,9b\n" TENTRY)
 946
 947 #define __asm_clear_16(to, ret) \
 948         __asm_clear_16x_cont(to, ret, "", "", "")
 949
 950 unsigned long __do_clear_user(void __user *pto, unsigned long pn)
 951 {
 952         register char __user *dst asm ("D0Re0") = pto;
 953         register unsigned long n asm ("D1Re0") = pn;
 954         register unsigned long retn asm ("D0Ar6") = 0;
 955
 956         if ((unsigned long) dst & 1) {
 957                 __asm_clear_1(dst, retn);
 958                 n--;
 959         }
 960
 961         if ((unsigned long) dst & 2) {
 962                 __asm_clear_2(dst, retn);
 963                 n -= 2;
 964         }
 965
 966         /* 64 bit copy loop */
 967         if (!((__force unsigned long) dst & 7)) {
 968                 while (n >= 8) {
 969                         __asm_clear_8x64(dst, retn);
 970                         n -= 8;
 971                 }
 972         }
 973
 974         while (n >= 16) {
 975                 __asm_clear_16(dst, retn);
 976                 n -= 16;
 977         }
 978
 979         while (n >= 4) {
 980                 __asm_clear_4(dst, retn);
 981                 n -= 4;
 982         }
 983
 984         switch (n) {
 985         case 0:
 986                 break;
 987         case 1:
 988                 __asm_clear_1(dst, retn);
 989                 break;
 990         case 2:
 991                 __asm_clear_2(dst, retn);
 992                 break;
 993         case 3:
 994                 __asm_clear_3(dst, retn);
 995                 break;
 996         }
 997
 998         return retn;
 999 }
1000 EXPORT_SYMBOL(__do_clear_user);
1001
1002 unsigned char __get_user_asm_b(const void __user *addr, long *err)
1003 {
1004         register unsigned char x asm ("D0Re0") = 0;
1005         asm volatile (
1006                 "       GETB %0,[%2]\n"
1007                 "1:\n"
1008                 "       GETB %0,[%2]\n"
1009                 "2:\n"
1010                 "       .section .fixup,\"ax\"\n"
1011                 "3:     MOV     D0FrT,%3\n"
1012                 "       SETD    [%1],D0FrT\n"
1013                 "       MOVT    D0FrT,#HI(2b)\n"
1014                 "       JUMP    D0FrT,#LO(2b)\n"
1015                 "       .previous\n"
1016                 "       .section __ex_table,\"a\"\n"
1017                 "       .long 1b,3b\n"
1018                 "       .previous\n"
1019                 : "=r" (x)
1020                 : "r" (err), "r" (addr), "P" (-EFAULT)
1021                 : "D0FrT");
1022         return x;
1023 }
1024 EXPORT_SYMBOL(__get_user_asm_b);
1025
1026 unsigned short __get_user_asm_w(const void __user *addr, long *err)
1027 {
1028         register unsigned short x asm ("D0Re0") = 0;
1029         asm volatile (
1030                 "       GETW %0,[%2]\n"
1031                 "1:\n"
1032                 "       GETW %0,[%2]\n"
1033                 "2:\n"
1034                 "       .section .fixup,\"ax\"\n"
1035                 "3:     MOV     D0FrT,%3\n"
1036                 "       SETD    [%1],D0FrT\n"
1037                 "       MOVT    D0FrT,#HI(2b)\n"
1038                 "       JUMP    D0FrT,#LO(2b)\n"
1039                 "       .previous\n"
1040                 "       .section __ex_table,\"a\"\n"
1041                 "       .long 1b,3b\n"
1042                 "       .previous\n"
1043                 : "=r" (x)
1044                 : "r" (err), "r" (addr), "P" (-EFAULT)
1045                 : "D0FrT");
1046         return x;
1047 }
1048 EXPORT_SYMBOL(__get_user_asm_w);
1049
1050 unsigned int __get_user_asm_d(const void __user *addr, long *err)
1051 {
1052         register unsigned int x asm ("D0Re0") = 0;
1053         asm volatile (
1054                 "       GETD %0,[%2]\n"
1055                 "1:\n"
1056                 "       GETD %0,[%2]\n"
1057                 "2:\n"
1058                 "       .section .fixup,\"ax\"\n"
1059                 "3:     MOV     D0FrT,%3\n"
1060                 "       SETD    [%1],D0FrT\n"
1061                 "       MOVT    D0FrT,#HI(2b)\n"
1062                 "       JUMP    D0FrT,#LO(2b)\n"
1063                 "       .previous\n"
1064                 "       .section __ex_table,\"a\"\n"
1065                 "       .long 1b,3b\n"
1066                 "       .previous\n"
1067                 : "=r" (x)
1068                 : "r" (err), "r" (addr), "P" (-EFAULT)
1069                 : "D0FrT");
1070         return x;
1071 }
1072 EXPORT_SYMBOL(__get_user_asm_d);
1073
1074 long __put_user_asm_b(unsigned int x, void __user *addr)
1075 {
1076         register unsigned int err asm ("D0Re0") = 0;
1077         asm volatile (
1078                 "       MOV  %0,#0\n"
1079                 "       SETB [%2],%1\n"
1080                 "1:\n"
1081                 "       SETB [%2],%1\n"
1082                 "2:\n"
1083                 ".section .fixup,\"ax\"\n"
1084                 "3:     MOV     %0,%3\n"
1085                 "       MOVT    D0FrT,#HI(2b)\n"
1086                 "       JUMP    D0FrT,#LO(2b)\n"
1087                 ".previous\n"
1088                 ".section __ex_table,\"a\"\n"
1089                 "       .long 1b,3b\n"
1090                 ".previous"
1091                 : "=r"(err)
1092                 : "d" (x), "a" (addr), "P"(-EFAULT)
1093                 : "D0FrT");
1094         return err;
1095 }
1096 EXPORT_SYMBOL(__put_user_asm_b);
1097
1098 long __put_user_asm_w(unsigned int x, void __user *addr)
1099 {
1100         register unsigned int err asm ("D0Re0") = 0;
1101         asm volatile (
1102                 "       MOV  %0,#0\n"
1103                 "       SETW [%2],%1\n"
1104                 "1:\n"
1105                 "       SETW [%2],%1\n"
1106                 "2:\n"
1107                 ".section .fixup,\"ax\"\n"
1108                 "3:     MOV     %0,%3\n"
1109                 "       MOVT    D0FrT,#HI(2b)\n"
1110                 "       JUMP    D0FrT,#LO(2b)\n"
1111                 ".previous\n"
1112                 ".section __ex_table,\"a\"\n"
1113                 "       .long 1b,3b\n"
1114                 ".previous"
1115                 : "=r"(err)
1116                 : "d" (x), "a" (addr), "P"(-EFAULT)
1117                 : "D0FrT");
1118         return err;
1119 }
1120 EXPORT_SYMBOL(__put_user_asm_w);
1121
1122 long __put_user_asm_d(unsigned int x, void __user *addr)
1123 {
1124         register unsigned int err asm ("D0Re0") = 0;
1125         asm volatile (
1126                 "       MOV  %0,#0\n"
1127                 "       SETD [%2],%1\n"
1128                 "1:\n"
1129                 "       SETD [%2],%1\n"
1130                 "2:\n"
1131                 ".section .fixup,\"ax\"\n"
1132                 "3:     MOV     %0,%3\n"
1133                 "       MOVT    D0FrT,#HI(2b)\n"
1134                 "       JUMP    D0FrT,#LO(2b)\n"
1135                 ".previous\n"
1136                 ".section __ex_table,\"a\"\n"
1137                 "       .long 1b,3b\n"
1138                 ".previous"
1139                 : "=r"(err)
1140                 : "d" (x), "a" (addr), "P"(-EFAULT)
1141                 : "D0FrT");
1142         return err;
1143 }
1144 EXPORT_SYMBOL(__put_user_asm_d);
1145
1146 long __put_user_asm_l(unsigned long long x, void __user *addr)
1147 {
1148         register unsigned int err asm ("D0Re0") = 0;
1149         asm volatile (
1150                 "       MOV  %0,#0\n"
1151                 "       SETL [%2],%1,%t1\n"
1152                 "1:\n"
1153                 "       SETL [%2],%1,%t1\n"
1154                 "2:\n"
1155                 ".section .fixup,\"ax\"\n"
1156                 "3:     MOV     %0,%3\n"
1157                 "       MOVT    D0FrT,#HI(2b)\n"
1158                 "       JUMP    D0FrT,#LO(2b)\n"
1159                 ".previous\n"
1160                 ".section __ex_table,\"a\"\n"
1161                 "       .long 1b,3b\n"
1162                 ".previous"
1163                 : "=r"(err)
1164                 : "d" (x), "a" (addr), "P"(-EFAULT)
1165                 : "D0FrT");
1166         return err;
1167 }
1168 EXPORT_SYMBOL(__put_user_asm_l);
1169
1170 long strnlen_user(const char __user *src, long count)
1171 {
1172         long res;
1173
1174         if (!access_ok(VERIFY_READ, src, 0))
1175                 return 0;
1176
1177         asm volatile (" MOV     D0Ar4, %1\n"
1178                       " MOV     D0Ar6, %2\n"
1179                       "0:\n"
1180                       " SUBS    D0FrT, D0Ar6, #0\n"
1181                       " SUB     D0Ar6, D0Ar6, #1\n"
1182                       " BLE     2f\n"
1183                       " GETB    D0FrT, [D0Ar4+#1++]\n"
1184                       "1:\n"
1185                       " TST     D0FrT, #255\n"
1186                       " BNE     0b\n"
1187                       "2:\n"
1188                       " SUB     %0, %2, D0Ar6\n"
1189                       "3:\n"
1190                       " .section .fixup,\"ax\"\n"
1191                       "4:\n"
1192                       " MOV     %0, #0\n"
1193                       " MOVT    D0FrT,#HI(3b)\n"
1194                       " JUMP    D0FrT,#LO(3b)\n"
1195                       " .previous\n"
1196                       " .section __ex_table,\"a\"\n"
1197                       " .long 1b,4b\n"
1198                       " .previous\n"
1199                       : "=r" (res)
1200                       : "r" (src), "r" (count)
1201                       : "D0FrT", "D0Ar4", "D0Ar6", "cc");
1202
1203         return res;
1204 }
1205 EXPORT_SYMBOL(strnlen_user);
1206
1207 long __strncpy_from_user(char *dst, const char __user *src, long count)
1208 {
1209         long res;
1210
1211         if (count == 0)
1212                 return 0;
1213
1214         /*
1215          * Currently, in 2.4.0-test9, most ports use a simple byte-copy loop.
1216          *  So do we.
1217          *
1218          *  This code is deduced from:
1219          *
1220          *      char tmp2;
1221          *      long tmp1, tmp3;
1222          *      tmp1 = count;
1223          *      while ((*dst++ = (tmp2 = *src++)) != 0
1224          *             && --tmp1)
1225          *        ;
1226          *
1227          *      res = count - tmp1;
1228          *
1229          *  with tweaks.
1230          */
1231
1232         asm volatile (" MOV  %0,%3\n"
1233                       "1:\n"
1234                       " GETB D0FrT,[%2++]\n"
1235                       "2:\n"
1236                       " CMP  D0FrT,#0\n"
1237                       " SETB [%1++],D0FrT\n"
1238                       " BEQ  3f\n"
1239                       " SUBS %0,%0,#1\n"
1240                       " BNZ  1b\n"
1241                       "3:\n"
1242                       " SUB  %0,%3,%0\n"
1243                       "4:\n"
1244                       " .section .fixup,\"ax\"\n"
1245                       "5:\n"
1246                       " MOV  %0,%7\n"
1247                       " MOVT    D0FrT,#HI(4b)\n"
1248                       " JUMP    D0FrT,#LO(4b)\n"
1249                       " .previous\n"
1250                       " .section __ex_table,\"a\"\n"
1251                       " .long 2b,5b\n"
1252                       " .previous"
1253                       : "=r" (res), "=r" (dst), "=r" (src), "=r" (count)
1254                       : "3" (count), "1" (dst), "2" (src), "P" (-EFAULT)
1255                       : "D0FrT", "memory", "cc");
1256
1257         return res;
1258 }
1259 EXPORT_SYMBOL(__strncpy_from_user);