include/asm-m68k/uaccess.h

   1 #ifndef __M68K_UACCESS_H
   2 #define __M68K_UACCESS_H
   3
   4 /*
   5  * User space memory access functions
   6  */
   7 #include <linux/errno.h>
   8 #include <linux/sched.h>
   9 #include <asm/segment.h>
  10
  11 #define VERIFY_READ     0
  12 #define VERIFY_WRITE    1
  13
  14 /* We let the MMU do all checking */
  15 #define access_ok(type,addr,size) 1
  16
  17 static inline int verify_area(int type, const void *addr, unsigned long size)
  18 {
  19         return access_ok(type,addr,size)?0:-EFAULT;
  20 }
  21
  22 /*
  23  * The exception table consists of pairs of addresses: the first is the
  24  * address of an instruction that is allowed to fault, and the second is
  25  * the address at which the program should continue.  No registers are
  26  * modified, so it is entirely up to the continuation code to figure out
  27  * what to do.
  28  *
  29  * All the routines below use bits of fixup code that are out of line
  30  * with the main instruction path.  This means when everything is well,
  31  * we don't even have to jump over them.  Further, they do not intrude
  32  * on our cache or tlb entries.
  33  */
  34
  35 struct exception_table_entry
  36 {
  37         unsigned long insn, fixup;
  38 };
  39
  40
  41 /*
  42  * These are the main single-value transfer routines.  They automatically
  43  * use the right size if we just have the right pointer type.
  44  */
  45
  46 #define put_user(x, ptr)                                \
  47 ({                                                      \
  48     int __pu_err;                                       \
  49     typeof(*(ptr)) __pu_val = (x);                      \
  50     switch (sizeof (*(ptr))) {                          \
  51     case 1:                                             \
  52         __put_user_asm(__pu_err, __pu_val, ptr, b);     \
  53         break;                                          \
  54     case 2:                                             \
  55         __put_user_asm(__pu_err, __pu_val, ptr, w);     \
  56         break;                                          \
  57     case 4:                                             \
  58         __put_user_asm(__pu_err, __pu_val, ptr, l);     \
  59         break;                                          \
  60     case 8:                                             \
  61        __pu_err = __constant_copy_to_user(ptr, &__pu_val, 8);        \
  62        break;                                           \
  63     default:                                            \
  64         __pu_err = __put_user_bad();                    \
  65         break;                                          \
  66     }                                                   \
  67     __pu_err;                                           \
  68 })
  69 #define __put_user(x, ptr) put_user(x, ptr)
  70
  71 extern int __put_user_bad(void);
  72
  73 /*
  74  * Tell gcc we read from memory instead of writing: this is because
  75  * we do not write to any memory gcc knows about, so there are no
  76  * aliasing issues.
  77  */
  78 #define __put_user_asm(err,x,ptr,bwl)                   \
  79 __asm__ __volatile__                                    \
  80     ("21:moves" #bwl " %2,%1\n"                         \
  81      "1:\n"                                             \
  82      ".section .fixup,\"ax\"\n"                         \
  83      "   .even\n"                                       \
  84      "2: movel %3,%0\n"                                 \
  85      "   jra 1b\n"                                      \
  86      ".previous\n"                                      \
  87      ".section __ex_table,\"a\"\n"                      \
  88      "   .align 4\n"                                    \
  89      "   .long 21b,2b\n"                                \
  90      "   .long 1b,2b\n"                                 \
  91      ".previous"                                        \
  92      : "=d"(err)                                        \
  93      : "m"(*(ptr)), "r"(x), "i"(-EFAULT), "0"(0))
  94
  95 #define get_user(x, ptr)                                        \
  96 ({                                                              \
  97     int __gu_err;                                               \
  98     typeof(*(ptr)) __gu_val;                                    \
  99     switch (sizeof(*(ptr))) {                                   \
 100     case 1:                                                     \
 101         __get_user_asm(__gu_err, __gu_val, ptr, b, "=d");       \
 102         break;                                                  \
 103     case 2:                                                     \
 104         __get_user_asm(__gu_err, __gu_val, ptr, w, "=r");       \
 105         break;                                                  \
 106     case 4:                                                     \
 107         __get_user_asm(__gu_err, __gu_val, ptr, l, "=r");       \
 108         break;                                                  \
 109     case 8:                                                     \
 110         __gu_err = __constant_copy_from_user(&__gu_val, ptr, 8);  \
 111         break;                                                  \
 112     default:                                                    \
 113         __gu_val = 0;                                           \
 114         __gu_err = __get_user_bad();                            \
 115         break;                                                  \
 116     }                                                           \
 117     (x) = __gu_val;                                             \
 118     __gu_err;                                                   \
 119 })
 120 #define __get_user(x, ptr) get_user(x, ptr)
 121
 122 extern int __get_user_bad(void);
 123
 124 #define __get_user_asm(err,x,ptr,bwl,reg)       \
 125 __asm__ __volatile__                            \
 126     ("1: moves" #bwl " %2,%1\n"                 \
 127      "2:\n"                                     \
 128      ".section .fixup,\"ax\"\n"                 \
 129      "   .even\n"                               \
 130      "3: movel %3,%0\n"                         \
 131      "   sub" #bwl " %1,%1\n"                   \
 132      "   jra 2b\n"                              \
 133      ".previous\n"                              \
 134      ".section __ex_table,\"a\"\n"              \
 135      "   .align 4\n"                            \
 136      "   .long 1b,3b\n"                         \
 137      ".previous"                                \
 138      : "=d"(err), reg(x)                        \
 139      : "m"(*(ptr)), "i" (-EFAULT), "0"(0))
 140
 141 static inline unsigned long
 142 __generic_copy_from_user(void *to, const void *from, unsigned long n)
 143 {
 144     unsigned long tmp;
 145     __asm__ __volatile__
 146         ("   tstl %2\n"
 147          "   jeq 2f\n"
 148          "1: movesl (%1)+,%3\n"
 149          "   movel %3,(%0)+\n"
 150          "   subql #1,%2\n"
 151          "   jne 1b\n"
 152          "2: movel %4,%2\n"
 153          "   bclr #1,%2\n"
 154          "   jeq 4f\n"
 155          "3: movesw (%1)+,%3\n"
 156          "   movew %3,(%0)+\n"
 157          "4: bclr #0,%2\n"
 158          "   jeq 6f\n"
 159          "5: movesb (%1)+,%3\n"
 160          "   moveb %3,(%0)+\n"
 161          "6:\n"
 162          ".section .fixup,\"ax\"\n"
 163          "   .even\n"
 164          "7: movel %2,%%d0\n"
 165          "71:clrl (%0)+\n"
 166          "   subql #1,%%d0\n"
 167          "   jne 71b\n"
 168          "   lsll #2,%2\n"
 169          "   addl %4,%2\n"
 170          "   btst #1,%4\n"
 171          "   jne 81f\n"
 172          "   btst #0,%4\n"
 173          "   jne 91f\n"
 174          "   jra 6b\n"
 175          "8: addql #2,%2\n"
 176          "81:clrw (%0)+\n"
 177          "   btst #0,%4\n"
 178          "   jne 91f\n"
 179          "   jra 6b\n"
 180          "9: addql #1,%2\n"
 181          "91:clrb (%0)+\n"
 182          "   jra 6b\n"
 183          ".previous\n"
 184          ".section __ex_table,\"a\"\n"
 185          "   .align 4\n"
 186          "   .long 1b,7b\n"
 187          "   .long 3b,8b\n"
 188          "   .long 5b,9b\n"
 189          ".previous"
 190          : "=a"(to), "=a"(from), "=d"(n), "=&d"(tmp)
 191          : "d"(n & 3), "0"(to), "1"(from), "2"(n/4)
 192          : "d0", "memory");
 193     return n;
 194 }
 195
 196 static inline unsigned long
 197 __generic_copy_to_user(void *to, const void *from, unsigned long n)
 198 {
 199     unsigned long tmp;
 200     __asm__ __volatile__
 201         ("   tstl %2\n"
 202          "   jeq 3f\n"
 203          "1: movel (%1)+,%3\n"
 204          "22:movesl %3,(%0)+\n"
 205          "2: subql #1,%2\n"
 206          "   jne 1b\n"
 207          "3: movel %4,%2\n"
 208          "   bclr #1,%2\n"
 209          "   jeq 4f\n"
 210          "   movew (%1)+,%3\n"
 211          "24:movesw %3,(%0)+\n"
 212          "4: bclr #0,%2\n"
 213          "   jeq 5f\n"
 214          "   moveb (%1)+,%3\n"
 215          "25:movesb %3,(%0)+\n"
 216          "5:\n"
 217          ".section .fixup,\"ax\"\n"
 218          "   .even\n"
 219          "60:addql #1,%2\n"
 220          "6: lsll #2,%2\n"
 221          "   addl %4,%2\n"
 222          "   jra 5b\n"
 223          "7: addql #2,%2\n"
 224          "   jra 5b\n"
 225          "8: addql #1,%2\n"
 226          "   jra 5b\n"
 227          ".previous\n"
 228          ".section __ex_table,\"a\"\n"
 229          "   .align 4\n"
 230          "   .long 1b,60b\n"
 231          "   .long 22b,6b\n"
 232          "   .long 2b,6b\n"
 233          "   .long 24b,7b\n"
 234          "   .long 3b,60b\n"
 235          "   .long 4b,7b\n"
 236          "   .long 25b,8b\n"
 237          "   .long 5b,8b\n"
 238          ".previous"
 239          : "=a"(to), "=a"(from), "=d"(n), "=&d"(tmp)
 240          : "r"(n & 3), "0"(to), "1"(from), "2"(n / 4)
 241          : "memory");
 242     return n;
 243 }
 244
 245 #define __copy_from_user_big(to, from, n, fixup, copy)  \
 246     __asm__ __volatile__                                \
 247         ("10: movesl (%1)+,%%d0\n"                      \
 248          "    movel %%d0,(%0)+\n"                       \
 249          "    subql #1,%2\n"                            \
 250          "    jne 10b\n"                                \
 251          ".section .fixup,\"ax\"\n"                     \
 252          "    .even\n"                                  \
 253          "11: movel %2,%%d0\n"                          \
 254          "13: clrl (%0)+\n"                             \
 255          "    subql #1,%%d0\n"                          \
 256          "    jne 13b\n"                                \
 257          "    lsll #2,%2\n"                             \
 258          fixup "\n"                                     \
 259          "    jra 12f\n"                                \
 260          ".previous\n"                                  \
 261          ".section __ex_table,\"a\"\n"                  \
 262          "    .align 4\n"                               \
 263          "    .long 10b,11b\n"                          \
 264          ".previous\n"                                  \
 265          copy "\n"                                      \
 266          "12:"                                          \
 267          : "=a"(to), "=a"(from), "=d"(n)                \
 268          : "0"(to), "1"(from), "2"(n/4)                 \
 269          : "d0", "memory")
 270
 271 static inline unsigned long
 272 __constant_copy_from_user(void *to, const void *from, unsigned long n)
 273 {
 274     switch (n) {
 275     case 0:
 276         break;
 277     case 1:
 278         __asm__ __volatile__
 279             ("1: movesb (%1)+,%%d0\n"
 280              "   moveb %%d0,(%0)+\n"
 281              "2:\n"
 282              ".section .fixup,\"ax\"\n"
 283              "   .even\n"
 284              "3: addql #1,%2\n"
 285              "   clrb (%0)+\n"
 286              "   jra 2b\n"
 287              ".previous\n"
 288              ".section __ex_table,\"a\"\n"
 289              "   .align 4\n"
 290              "   .long 1b,3b\n"
 291              ".previous"
 292              : "=a"(to), "=a"(from), "=d"(n)
 293              : "0"(to), "1"(from), "2"(0)
 294              : "d0", "memory");
 295         break;
 296     case 2:
 297         __asm__ __volatile__
 298             ("1: movesw (%1)+,%%d0\n"
 299              "   movew %%d0,(%0)+\n"
 300              "2:\n"
 301              ".section .fixup,\"ax\"\n"
 302              "   .even\n"
 303              "3: addql #2,%2\n"
 304              "   clrw (%0)+\n"
 305              "   jra 2b\n"
 306              ".previous\n"
 307              ".section __ex_table,\"a\"\n"
 308              "   .align 4\n"
 309              "   .long 1b,3b\n"
 310              ".previous"
 311              : "=a"(to), "=a"(from), "=d"(n)
 312              : "0"(to), "1"(from), "2"(0)
 313              : "d0", "memory");
 314         break;
 315     case 3:
 316         __asm__ __volatile__
 317             ("1: movesw (%1)+,%%d0\n"
 318              "   movew %%d0,(%0)+\n"
 319              "2: movesb (%1)+,%%d0\n"
 320              "   moveb %%d0,(%0)+\n"
 321              "3:"
 322              ".section .fixup,\"ax\"\n"
 323              "   .even\n"
 324              "4: addql #2,%2\n"
 325              "   clrw (%0)+\n"
 326              "5: addql #1,%2\n"
 327              "   clrb (%0)+\n"
 328              "   jra 3b\n"
 329              ".previous\n"
 330              ".section __ex_table,\"a\"\n"
 331              "   .align 4\n"
 332              "   .long 1b,4b\n"
 333              "   .long 2b,5b\n"
 334              ".previous"
 335              : "=a"(to), "=a"(from), "=d"(n)
 336              : "0"(to), "1"(from), "2"(0)
 337              : "d0", "memory");
 338         break;
 339     case 4:
 340         __asm__ __volatile__
 341             ("1: movesl (%1)+,%%d0\n"
 342              "   movel %%d0,(%0)+\n"
 343              "2:"
 344              ".section .fixup,\"ax\"\n"
 345              "   .even\n"
 346              "3: addql #4,%2\n"
 347              "   clrl (%0)+\n"
 348              "   jra 2b\n"
 349              ".previous\n"
 350              ".section __ex_table,\"a\"\n"
 351              "   .align 4\n"
 352              "   .long 1b,3b\n"
 353              ".previous"
 354              : "=a"(to), "=a"(from), "=d"(n)
 355              : "0"(to), "1"(from), "2"(0)
 356              : "d0", "memory");
 357         break;
 358     case 8:
 359         __asm__ __volatile__
 360             ("1: movesl (%1)+,%%d0\n"
 361              "   movel %%d0,(%0)+\n"
 362              "2: movesl (%1)+,%%d0\n"
 363              "   movel %%d0,(%0)+\n"
 364              "3:"
 365              ".section .fixup,\"ax\"\n"
 366              "   .even\n"
 367              "4: addql #4,%2\n"
 368              "   clrl (%0)+\n"
 369              "5: addql #4,%2\n"
 370              "   clrl (%0)+\n"
 371              "   jra 3b\n"
 372              ".previous\n"
 373              ".section __ex_table,\"a\"\n"
 374              "   .align 4\n"
 375              "   .long 1b,4b\n"
 376              "   .long 2b,5b\n"
 377              ".previous"
 378              : "=a"(to), "=a"(from), "=d"(n)
 379              : "0"(to), "1"(from), "2"(0)
 380              : "d0", "memory");
 381         break;
 382     case 12:
 383         __asm__ __volatile__
 384             ("1: movesl (%1)+,%%d0\n"
 385              "   movel %%d0,(%0)+\n"
 386              "2: movesl (%1)+,%%d0\n"
 387              "   movel %%d0,(%0)+\n"
 388              "3: movesl (%1)+,%%d0\n"
 389              "   movel %%d0,(%0)+\n"
 390              "4:"
 391              ".section .fixup,\"ax\"\n"
 392              "   .even\n"
 393              "5: addql #4,%2\n"
 394              "   clrl (%0)+\n"
 395              "6: addql #4,%2\n"
 396              "   clrl (%0)+\n"
 397              "7: addql #4,%2\n"
 398              "   clrl (%0)+\n"
 399              "   jra 4b\n"
 400              ".previous\n"
 401              ".section __ex_table,\"a\"\n"
 402              "   .align 4\n"
 403              "   .long 1b,5b\n"
 404              "   .long 2b,6b\n"
 405              "   .long 3b,7b\n"
 406              ".previous"
 407              : "=a"(to), "=a"(from), "=d"(n)
 408              : "0"(to), "1"(from), "2"(0)
 409              : "d0", "memory");
 410         break;
 411     case 16:
 412         __asm__ __volatile__
 413             ("1: movesl (%1)+,%%d0\n"
 414              "   movel %%d0,(%0)+\n"
 415              "2: movesl (%1)+,%%d0\n"
 416              "   movel %%d0,(%0)+\n"
 417              "3: movesl (%1)+,%%d0\n"
 418              "   movel %%d0,(%0)+\n"
 419              "4: movesl (%1)+,%%d0\n"
 420              "   movel %%d0,(%0)+\n"
 421              "5:"
 422              ".section .fixup,\"ax\"\n"
 423              "   .even\n"
 424              "6: addql #4,%2\n"
 425              "   clrl (%0)+\n"
 426              "7: addql #4,%2\n"
 427              "   clrl (%0)+\n"
 428              "8: addql #4,%2\n"
 429              "   clrl (%0)+\n"
 430              "9: addql #4,%2\n"
 431              "   clrl (%0)+\n"
 432              "   jra 5b\n"
 433              ".previous\n"
 434              ".section __ex_table,\"a\"\n"
 435              "   .align 4\n"
 436              "   .long 1b,6b\n"
 437              "   .long 2b,7b\n"
 438              "   .long 3b,8b\n"
 439              "   .long 4b,9b\n"
 440              ".previous"
 441              : "=a"(to), "=a"(from), "=d"(n)
 442              : "0"(to), "1"(from), "2"(0)
 443              : "d0", "memory");
 444         break;
 445     default:
 446         switch (n & 3) {
 447         case 0:
 448             __copy_from_user_big(to, from, n, "", "");
 449             break;
 450         case 1:
 451             __copy_from_user_big(to, from, n,
 452                                  /* fixup */
 453                                  "1: addql #1,%2\n"
 454                                  "   clrb (%0)+",
 455                                  /* copy */
 456                                  "2: movesb (%1)+,%%d0\n"
 457                                  "   moveb %%d0,(%0)+\n"
 458                                  ".section __ex_table,\"a\"\n"
 459                                  "   .long 2b,1b\n"
 460                                  ".previous");
 461             break;
 462         case 2:
 463             __copy_from_user_big(to, from, n,
 464                                  /* fixup */
 465                                  "1: addql #2,%2\n"
 466                                  "   clrw (%0)+",
 467                                  /* copy */
 468                                  "2: movesw (%1)+,%%d0\n"
 469                                  "   movew %%d0,(%0)+\n"
 470                                  ".section __ex_table,\"a\"\n"
 471                                  "   .long 2b,1b\n"
 472                                  ".previous");
 473             break;
 474         case 3:
 475             __copy_from_user_big(to, from, n,
 476                                  /* fixup */
 477                                  "1: addql #2,%2\n"
 478                                  "   clrw (%0)+\n"
 479                                  "2: addql #1,%2\n"
 480                                  "   clrb (%0)+",
 481                                  /* copy */
 482                                  "3: movesw (%1)+,%%d0\n"
 483                                  "   movew %%d0,(%0)+\n"
 484                                  "4: movesb (%1)+,%%d0\n"
 485                                  "   moveb %%d0,(%0)+\n"
 486                                  ".section __ex_table,\"a\"\n"
 487                                  "   .long 3b,1b\n"
 488                                  "   .long 4b,2b\n"
 489                                  ".previous");
 490             break;
 491         }
 492         break;
 493     }
 494     return n;
 495 }
 496
 497 #define __copy_to_user_big(to, from, n, fixup, copy)    \
 498     __asm__ __volatile__                                \
 499         ("10: movel (%1)+,%%d0\n"                       \
 500          "31: movesl %%d0,(%0)+\n"                      \
 501          "11: subql #1,%2\n"                            \
 502          "    jne 10b\n"                                \
 503          "41:\n"                                        \
 504          ".section .fixup,\"ax\"\n"                     \
 505          "   .even\n"                                   \
 506          "22: addql #1,%2\n"                            \
 507          "12: lsll #2,%2\n"                             \
 508          fixup "\n"                                     \
 509          "    jra 13f\n"                                \
 510          ".previous\n"                                  \
 511          ".section __ex_table,\"a\"\n"                  \
 512          "    .align 4\n"                               \
 513          "    .long 10b,22b\n"                          \
 514          "    .long 31b,12b\n"                          \
 515          "    .long 11b,12b\n"                          \
 516          "    .long 41b,22b\n"                          \
 517          ".previous\n"                                  \
 518          copy "\n"                                      \
 519          "13:"                                          \
 520          : "=a"(to), "=a"(from), "=d"(n)                \
 521          : "0"(to), "1"(from), "2"(n/4)                 \
 522          : "d0", "memory")
 523
 524 #define __copy_to_user_inatomic __copy_to_user
 525 #define __copy_from_user_inatomic __copy_from_user
 526
 527 static inline unsigned long
 528 __constant_copy_to_user(void *to, const void *from, unsigned long n)
 529 {
 530     switch (n) {
 531     case 0:
 532         break;
 533     case 1:
 534         __asm__ __volatile__
 535             ("   moveb (%1)+,%%d0\n"
 536              "21:movesb %%d0,(%0)+\n"
 537              "1:\n"
 538              ".section .fixup,\"ax\"\n"
 539              "   .even\n"
 540              "2: addql #1,%2\n"
 541              "   jra 1b\n"
 542              ".previous\n"
 543              ".section __ex_table,\"a\"\n"
 544              "   .align 4\n  "
 545              "   .long 21b,2b\n"
 546              "   .long 1b,2b\n"
 547              ".previous"
 548              : "=a"(to), "=a"(from), "=d"(n)
 549              : "0"(to), "1"(from), "2"(0)
 550              : "d0", "memory");
 551         break;
 552     case 2:
 553         __asm__ __volatile__
 554             ("   movew (%1)+,%%d0\n"
 555              "21:movesw %%d0,(%0)+\n"
 556              "1:\n"
 557              ".section .fixup,\"ax\"\n"
 558              "   .even\n"
 559              "2: addql #2,%2\n"
 560              "   jra 1b\n"
 561              ".previous\n"
 562              ".section __ex_table,\"a\"\n"
 563              "   .align 4\n"
 564              "   .long 21b,2b\n"
 565              "   .long 1b,2b\n"
 566              ".previous"
 567              : "=a"(to), "=a"(from), "=d"(n)
 568              : "0"(to), "1"(from), "2"(0)
 569              : "d0", "memory");
 570         break;
 571     case 3:
 572         __asm__ __volatile__
 573             ("   movew (%1)+,%%d0\n"
 574              "21:movesw %%d0,(%0)+\n"
 575              "1: moveb (%1)+,%%d0\n"
 576              "22:movesb %%d0,(%0)+\n"
 577              "2:\n"
 578              ".section .fixup,\"ax\"\n"
 579              "   .even\n"
 580              "3: addql #2,%2\n"
 581              "4: addql #1,%2\n"
 582              "   jra 2b\n"
 583              ".previous\n"
 584              ".section __ex_table,\"a\"\n"
 585              "   .align 4\n"
 586              "   .long 21b,3b\n"
 587              "   .long 1b,3b\n"
 588              "   .long 22b,4b\n"
 589              "   .long 2b,4b\n"
 590              ".previous"
 591              : "=a"(to), "=a"(from), "=d"(n)
 592              : "0"(to), "1"(from), "2"(0)
 593              : "d0", "memory");
 594         break;
 595     case 4:
 596         __asm__ __volatile__
 597             ("   movel (%1)+,%%d0\n"
 598              "21:movesl %%d0,(%0)+\n"
 599              "1:\n"
 600              ".section .fixup,\"ax\"\n"
 601              "   .even\n"
 602              "2: addql #4,%2\n"
 603              "   jra 1b\n"
 604              ".previous\n"
 605              ".section __ex_table,\"a\"\n"
 606              "   .align 4\n"
 607              "   .long 21b,2b\n"
 608              "   .long 1b,2b\n"
 609              ".previous"
 610              : "=a"(to), "=a"(from), "=d"(n)
 611              : "0"(to), "1"(from), "2"(0)
 612              : "d0", "memory");
 613         break;
 614     case 8:
 615         __asm__ __volatile__
 616             ("   movel (%1)+,%%d0\n"
 617              "21:movesl %%d0,(%0)+\n"
 618              "1: movel (%1)+,%%d0\n"
 619              "22:movesl %%d0,(%0)+\n"
 620              "2:\n"
 621              ".section .fixup,\"ax\"\n"
 622              "   .even\n"
 623              "3: addql #4,%2\n"
 624              "4: addql #4,%2\n"
 625              "   jra 2b\n"
 626              ".previous\n"
 627              ".section __ex_table,\"a\"\n"
 628              "   .align 4\n"
 629              "   .long 21b,3b\n"
 630              "   .long 1b,3b\n"
 631              "   .long 22b,4b\n"
 632              "   .long 2b,4b\n"
 633              ".previous"
 634              : "=a"(to), "=a"(from), "=d"(n)
 635              : "0"(to), "1"(from), "2"(0)
 636              : "d0", "memory");
 637         break;
 638     case 12:
 639         __asm__ __volatile__
 640             ("   movel (%1)+,%%d0\n"
 641              "21:movesl %%d0,(%0)+\n"
 642              "1: movel (%1)+,%%d0\n"
 643              "22:movesl %%d0,(%0)+\n"
 644              "2: movel (%1)+,%%d0\n"
 645              "23:movesl %%d0,(%0)+\n"
 646              "3:\n"
 647              ".section .fixup,\"ax\"\n"
 648              "   .even\n"
 649              "4: addql #4,%2\n"
 650              "5: addql #4,%2\n"
 651              "6: addql #4,%2\n"
 652              "   jra 3b\n"
 653              ".previous\n"
 654              ".section __ex_table,\"a\"\n"
 655              "   .align 4\n"
 656              "   .long 21b,4b\n"
 657              "   .long 1b,4b\n"
 658              "   .long 22b,5b\n"
 659              "   .long 2b,5b\n"
 660              "   .long 23b,6b\n"
 661              "   .long 3b,6b\n"
 662              ".previous"
 663              : "=a"(to), "=a"(from), "=d"(n)
 664              : "0"(to), "1"(from), "2"(0)
 665              : "d0", "memory");
 666         break;
 667     case 16:
 668         __asm__ __volatile__
 669             ("   movel (%1)+,%%d0\n"
 670              "21:movesl %%d0,(%0)+\n"
 671              "1: movel (%1)+,%%d0\n"
 672              "22:movesl %%d0,(%0)+\n"
 673              "2: movel (%1)+,%%d0\n"
 674              "23:movesl %%d0,(%0)+\n"
 675              "3: movel (%1)+,%%d0\n"
 676              "24:movesl %%d0,(%0)+\n"
 677              "4:"
 678              ".section .fixup,\"ax\"\n"
 679              "   .even\n"
 680              "5: addql #4,%2\n"
 681              "6: addql #4,%2\n"
 682              "7: addql #4,%2\n"
 683              "8: addql #4,%2\n"
 684              "   jra 4b\n"
 685              ".previous\n"
 686              ".section __ex_table,\"a\"\n"
 687              "   .align 4\n"
 688              "   .long 21b,5b\n"
 689              "   .long 1b,5b\n"
 690              "   .long 22b,6b\n"
 691              "   .long 2b,6b\n"
 692              "   .long 23b,7b\n"
 693              "   .long 3b,7b\n"
 694              "   .long 24b,8b\n"
 695              "   .long 4b,8b\n"
 696              ".previous"
 697              : "=a"(to), "=a"(from), "=d"(n)
 698              : "0"(to), "1"(from), "2"(0)
 699              : "d0", "memory");
 700         break;
 701     default:
 702         switch (n & 3) {
 703         case 0:
 704             __copy_to_user_big(to, from, n, "", "");
 705             break;
 706         case 1:
 707             __copy_to_user_big(to, from, n,
 708                                /* fixup */
 709                                "1: addql #1,%2",
 710                                /* copy */
 711                                "   moveb (%1)+,%%d0\n"
 712                                "22:movesb %%d0,(%0)+\n"
 713                                "2:"
 714                                ".section __ex_table,\"a\"\n"
 715                                "   .long 22b,1b\n"
 716                                "   .long 2b,1b\n"
 717                                ".previous");
 718             break;
 719         case 2:
 720             __copy_to_user_big(to, from, n,
 721                                /* fixup */
 722                                "1: addql #2,%2",
 723                                /* copy */
 724                                "   movew (%1)+,%%d0\n"
 725                                "22:movesw %%d0,(%0)+\n"
 726                                "2:"
 727                                ".section __ex_table,\"a\"\n"
 728                                "   .long 22b,1b\n"
 729                                "   .long 2b,1b\n"
 730                                ".previous");
 731             break;
 732         case 3:
 733             __copy_to_user_big(to, from, n,
 734                                /* fixup */
 735                                "1: addql #2,%2\n"
 736                                "2: addql #1,%2",
 737                                /* copy */
 738                                "   movew (%1)+,%%d0\n"
 739                                "23:movesw %%d0,(%0)+\n"
 740                                "3: moveb (%1)+,%%d0\n"
 741                                "24:movesb %%d0,(%0)+\n"
 742                                "4:"
 743                                ".section __ex_table,\"a\"\n"
 744                                "   .long 23b,1b\n"
 745                                "   .long 3b,1b\n"
 746                                "   .long 24b,2b\n"
 747                                "   .long 4b,2b\n"
 748                                ".previous");
 749             break;
 750         }
 751         break;
 752     }
 753     return n;
 754 }
 755
 756 #define copy_from_user(to, from, n)             \
 757 (__builtin_constant_p(n) ?                      \
 758  __constant_copy_from_user(to, from, n) :       \
 759  __generic_copy_from_user(to, from, n))
 760
 761 #define copy_to_user(to, from, n)               \
 762 (__builtin_constant_p(n) ?                      \
 763  __constant_copy_to_user(to, from, n) :         \
 764  __generic_copy_to_user(to, from, n))
 765
 766 #define __copy_from_user(to, from, n) copy_from_user(to, from, n)
 767 #define __copy_to_user(to, from, n) copy_to_user(to, from, n)
 768
 769 /*
 770  * Copy a null terminated string from userspace.
 771  */
 772
 773 static inline long
 774 strncpy_from_user(char *dst, const char *src, long count)
 775 {
 776     long res;
 777     if (count == 0) return count;
 778     __asm__ __volatile__
 779         ("1: movesb (%2)+,%%d0\n"
 780          "12:moveb %%d0,(%1)+\n"
 781          "   jeq 2f\n"
 782          "   subql #1,%3\n"
 783          "   jne 1b\n"
 784          "2: subl %3,%0\n"
 785          "3:\n"
 786          ".section .fixup,\"ax\"\n"
 787          "   .even\n"
 788          "4: movel %4,%0\n"
 789          "   jra 3b\n"
 790          ".previous\n"
 791          ".section __ex_table,\"a\"\n"
 792          "   .align 4\n"
 793          "   .long 1b,4b\n"
 794          "   .long 12b,4b\n"
 795          ".previous"
 796          : "=d"(res), "=a"(dst), "=a"(src), "=d"(count)
 797          : "i"(-EFAULT), "0"(count), "1"(dst), "2"(src), "3"(count)
 798          : "d0", "memory");
 799     return res;
 800 }
 801
 802 /*
 803  * Return the size of a string (including the ending 0)
 804  *
 805  * Return 0 on exception, a value greater than N if too long
 806  */
 807 static inline long strnlen_user(const char *src, long n)
 808 {
 809         long res;
 810
 811         res = -(long)src;
 812         __asm__ __volatile__
 813                 ("1:\n"
 814                  "   tstl %2\n"
 815                  "   jeq 3f\n"
 816                  "2: movesb (%1)+,%%d0\n"
 817                  "22:\n"
 818                  "   subql #1,%2\n"
 819                  "   tstb %%d0\n"
 820                  "   jne 1b\n"
 821                  "   jra 4f\n"
 822                  "3:\n"
 823                  "   addql #1,%0\n"
 824                  "4:\n"
 825                  "   addl %1,%0\n"
 826                  "5:\n"
 827                  ".section .fixup,\"ax\"\n"
 828                  "   .even\n"
 829                  "6: moveq %3,%0\n"
 830                  "   jra 5b\n"
 831                  ".previous\n"
 832                  ".section __ex_table,\"a\"\n"
 833                  "   .align 4\n"
 834                  "   .long 2b,6b\n"
 835                  "   .long 22b,6b\n"
 836                  ".previous"
 837                  : "=d"(res), "=a"(src), "=d"(n)
 838                  : "i"(0), "0"(res), "1"(src), "2"(n)
 839                  : "d0");
 840         return res;
 841 }
 842
 843 #define strlen_user(str) strnlen_user(str, 32767)
 844
 845 /*
 846  * Zero Userspace
 847  */
 848
 849 static inline unsigned long
 850 clear_user(void *to, unsigned long n)
 851 {
 852     __asm__ __volatile__
 853         ("   tstl %1\n"
 854          "   jeq 3f\n"
 855          "1: movesl %3,(%0)+\n"
 856          "2: subql #1,%1\n"
 857          "   jne 1b\n"
 858          "3: movel %2,%1\n"
 859          "   bclr #1,%1\n"
 860          "   jeq 4f\n"
 861          "24:movesw %3,(%0)+\n"
 862          "4: bclr #0,%1\n"
 863          "   jeq 5f\n"
 864          "25:movesb %3,(%0)+\n"
 865          "5:\n"
 866          ".section .fixup,\"ax\"\n"
 867          "   .even\n"
 868          "61:addql #1,%1\n"
 869          "6: lsll #2,%1\n"
 870          "   addl %2,%1\n"
 871          "   jra 5b\n"
 872          "7: addql #2,%1\n"
 873          "   jra 5b\n"
 874          "8: addql #1,%1\n"
 875          "   jra 5b\n"
 876          ".previous\n"
 877          ".section __ex_table,\"a\"\n"
 878          "   .align 4\n"
 879          "   .long 1b,61b\n"
 880          "   .long 2b,6b\n"
 881          "   .long 3b,61b\n"
 882          "   .long 24b,7b\n"
 883          "   .long 4b,7b\n"
 884          "   .long 25b,8b\n"
 885          "   .long 5b,8b\n"
 886          ".previous"
 887          : "=a"(to), "=d"(n)
 888          : "r"(n & 3), "r"(0), "0"(to), "1"(n/4));
 889     return n;
 890 }
 891
 892 #endif /* _M68K_UACCESS_H */