arch/m68k/include/asm/uaccess_mm.h

   1 #ifndef __M68K_UACCESS_H
   2 #define __M68K_UACCESS_H
   3
   4 /*
   5  * User space memory access functions
   6  */
   7 #include <linux/compiler.h>
   8 #include <linux/errno.h>
   9 #include <linux/types.h>
  10 #include <linux/sched.h>
  11 #include <asm/segment.h>
  12
  13 #define VERIFY_READ     0
  14 #define VERIFY_WRITE    1
  15
  16 /* Coldifre doesn't have moves instruction; use move. */
  17 #ifdef CONFIG_COLDFIRE
  18 #define moves move
  19 #endif
  20
  21 /* We let the MMU do all checking */
  22 static inline int access_ok(int type, const void __user *addr,
  23                             unsigned long size)
  24 {
  25         return 1;
  26 }
  27
  28 /*
  29  * The exception table consists of pairs of addresses: the first is the
  30  * address of an instruction that is allowed to fault, and the second is
  31  * the address at which the program should continue.  No registers are
  32  * modified, so it is entirely up to the continuation code to figure out
  33  * what to do.
  34  *
  35  * All the routines below use bits of fixup code that are out of line
  36  * with the main instruction path.  This means when everything is well,
  37  * we don't even have to jump over them.  Further, they do not intrude
  38  * on our cache or tlb entries.
  39  */
  40
  41 struct exception_table_entry
  42 {
  43         unsigned long insn, fixup;
  44 };
  45
  46 extern int __put_user_bad(void);
  47 extern int __get_user_bad(void);
  48
  49 #define __put_user_asm(res, x, ptr, bwl, reg, err)      \
  50 asm volatile ("\n"                                      \
  51         "1:     moves."#bwl"    %2,%1\n"                \
  52         "2:\n"                                          \
  53         "       .section .fixup,\"ax\"\n"               \
  54         "       .even\n"                                \
  55         "10:    moveq.l %3,%0\n"                        \
  56         "       jra 2b\n"                               \
  57         "       .previous\n"                            \
  58         "\n"                                            \
  59         "       .section __ex_table,\"a\"\n"            \
  60         "       .align  4\n"                            \
  61         "       .long   1b,10b\n"                       \
  62         "       .long   2b,10b\n"                       \
  63         "       .previous"                              \
  64         : "+d" (res), "=m" (*(ptr))                     \
  65         : #reg (x), "i" (err))
  66
  67 /*
  68  * These are the main single-value transfer routines.  They automatically
  69  * use the right size if we just have the right pointer type.
  70  */
  71
  72 #define __put_user(x, ptr)                                              \
  73 ({                                                                      \
  74         typeof(*(ptr)) __pu_val = (x);                                  \
  75         int __pu_err = 0;                                               \
  76         __chk_user_ptr(ptr);                                            \
  77         switch (sizeof (*(ptr))) {                                      \
  78         case 1:                                                         \
  79                 __put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \
  80                 break;                                                  \
  81         case 2:                                                         \
  82                 __put_user_asm(__pu_err, __pu_val, ptr, w, d, -EFAULT); \
  83                 break;                                                  \
  84         case 4:                                                         \
  85                 __put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \
  86                 break;                                                  \
  87         case 8:                                                         \
  88             {                                                           \
  89                 const void __user *__pu_ptr = (ptr);                    \
  90                 asm volatile ("\n"                                      \
  91                         "1:     moves.l %2,(%1)+\n"                     \
  92                         "2:     moves.l %R2,(%1)\n"                     \
  93                         "3:\n"                                          \
  94                         "       .section .fixup,\"ax\"\n"               \
  95                         "       .even\n"                                \
  96                         "10:    movel %3,%0\n"                          \
  97                         "       jra 3b\n"                               \
  98                         "       .previous\n"                            \
  99                         "\n"                                            \
 100                         "       .section __ex_table,\"a\"\n"            \
 101                         "       .align 4\n"                             \
 102                         "       .long 1b,10b\n"                         \
 103                         "       .long 2b,10b\n"                         \
 104                         "       .long 3b,10b\n"                         \
 105                         "       .previous"                              \
 106                         : "+d" (__pu_err), "+a" (__pu_ptr)              \
 107                         : "r" (__pu_val), "i" (-EFAULT)                 \
 108                         : "memory");                                    \
 109                 break;                                                  \
 110             }                                                           \
 111         default:                                                        \
 112                 __pu_err = __put_user_bad();                            \
 113                 break;                                                  \
 114         }                                                               \
 115         __pu_err;                                                       \
 116 })
 117 #define put_user(x, ptr)        __put_user(x, ptr)
 118
 119
 120 #define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({     \
 121         type __gu_val;                                          \
 122         asm volatile ("\n"                                      \
 123                 "1:     moves."#bwl"    %2,%1\n"                \
 124                 "2:\n"                                          \
 125                 "       .section .fixup,\"ax\"\n"               \
 126                 "       .even\n"                                \
 127                 "10:    move.l  %3,%0\n"                        \
 128                 "       sub."#bwl"      %1,%1\n"                \
 129                 "       jra     2b\n"                           \
 130                 "       .previous\n"                            \
 131                 "\n"                                            \
 132                 "       .section __ex_table,\"a\"\n"            \
 133                 "       .align  4\n"                            \
 134                 "       .long   1b,10b\n"                       \
 135                 "       .previous"                              \
 136                 : "+d" (res), "=&" #reg (__gu_val)              \
 137                 : "m" (*(ptr)), "i" (err));                     \
 138         (x) = (typeof(*(ptr)))(unsigned long)__gu_val;          \
 139 })
 140
 141 #define __get_user(x, ptr)                                              \
 142 ({                                                                      \
 143         int __gu_err = 0;                                               \
 144         __chk_user_ptr(ptr);                                            \
 145         switch (sizeof(*(ptr))) {                                       \
 146         case 1:                                                         \
 147                 __get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT);    \
 148                 break;                                                  \
 149         case 2:                                                         \
 150                 __get_user_asm(__gu_err, x, ptr, u16, w, d, -EFAULT);   \
 151                 break;                                                  \
 152         case 4:                                                         \
 153                 __get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT);   \
 154                 break;                                                  \
 155 /*      case 8: disabled because gcc-4.1 has a broken typeof            \
 156             {                                                           \
 157                 const void *__gu_ptr = (ptr);                           \
 158                 u64 __gu_val;                                           \
 159                 asm volatile ("\n"                                      \
 160                         "1:     moves.l (%2)+,%1\n"                     \
 161                         "2:     moves.l (%2),%R1\n"                     \
 162                         "3:\n"                                          \
 163                         "       .section .fixup,\"ax\"\n"               \
 164                         "       .even\n"                                \
 165                         "10:    move.l  %3,%0\n"                        \
 166                         "       sub.l   %1,%1\n"                        \
 167                         "       sub.l   %R1,%R1\n"                      \
 168                         "       jra     3b\n"                           \
 169                         "       .previous\n"                            \
 170                         "\n"                                            \
 171                         "       .section __ex_table,\"a\"\n"            \
 172                         "       .align  4\n"                            \
 173                         "       .long   1b,10b\n"                       \
 174                         "       .long   2b,10b\n"                       \
 175                         "       .previous"                              \
 176                         : "+d" (__gu_err), "=&r" (__gu_val),            \
 177                           "+a" (__gu_ptr)                               \
 178                         : "i" (-EFAULT)                                 \
 179                         : "memory");                                    \
 180                 (x) = (typeof(*(ptr)))__gu_val;                         \
 181                 break;                                                  \
 182             }   */                                                      \
 183         default:                                                        \
 184                 __gu_err = __get_user_bad();                            \
 185                 break;                                                  \
 186         }                                                               \
 187         __gu_err;                                                       \
 188 })
 189 #define get_user(x, ptr) __get_user(x, ptr)
 190
 191 unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n);
 192 unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n);
 193
 194 #define __constant_copy_from_user_asm(res, to, from, tmp, n, s1, s2, s3)\
 195         asm volatile ("\n"                                              \
 196                 "1:     moves."#s1"     (%2)+,%3\n"                     \
 197                 "       move."#s1"      %3,(%1)+\n"                     \
 198                 "2:     moves."#s2"     (%2)+,%3\n"                     \
 199                 "       move."#s2"      %3,(%1)+\n"                     \
 200                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 201                 "3:     moves."#s3"     (%2)+,%3\n"                     \
 202                 "       move."#s3"      %3,(%1)+\n"                     \
 203                 "       .endif\n"                                       \
 204                 "4:\n"                                                  \
 205                 "       .section __ex_table,\"a\"\n"                    \
 206                 "       .align  4\n"                                    \
 207                 "       .long   1b,10f\n"                               \
 208                 "       .long   2b,20f\n"                               \
 209                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 210                 "       .long   3b,30f\n"                               \
 211                 "       .endif\n"                                       \
 212                 "       .previous\n"                                    \
 213                 "\n"                                                    \
 214                 "       .section .fixup,\"ax\"\n"                       \
 215                 "       .even\n"                                        \
 216                 "10:    clr."#s1"       (%1)+\n"                        \
 217                 "20:    clr."#s2"       (%1)+\n"                        \
 218                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 219                 "30:    clr."#s3"       (%1)+\n"                        \
 220                 "       .endif\n"                                       \
 221                 "       moveq.l #"#n",%0\n"                             \
 222                 "       jra     4b\n"                                   \
 223                 "       .previous\n"                                    \
 224                 : "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp)      \
 225                 : : "memory")
 226
 227 static __always_inline unsigned long
 228 __constant_copy_from_user(void *to, const void __user *from, unsigned long n)
 229 {
 230         unsigned long res = 0, tmp;
 231
 232         switch (n) {
 233         case 1:
 234                 __get_user_asm(res, *(u8 *)to, (u8 __user *)from, u8, b, d, 1);
 235                 break;
 236         case 2:
 237                 __get_user_asm(res, *(u16 *)to, (u16 __user *)from, u16, w, d, 2);
 238                 break;
 239         case 3:
 240                 __constant_copy_from_user_asm(res, to, from, tmp, 3, w, b,);
 241                 break;
 242         case 4:
 243                 __get_user_asm(res, *(u32 *)to, (u32 __user *)from, u32, l, r, 4);
 244                 break;
 245         case 5:
 246                 __constant_copy_from_user_asm(res, to, from, tmp, 5, l, b,);
 247                 break;
 248         case 6:
 249                 __constant_copy_from_user_asm(res, to, from, tmp, 6, l, w,);
 250                 break;
 251         case 7:
 252                 __constant_copy_from_user_asm(res, to, from, tmp, 7, l, w, b);
 253                 break;
 254         case 8:
 255                 __constant_copy_from_user_asm(res, to, from, tmp, 8, l, l,);
 256                 break;
 257         case 9:
 258                 __constant_copy_from_user_asm(res, to, from, tmp, 9, l, l, b);
 259                 break;
 260         case 10:
 261                 __constant_copy_from_user_asm(res, to, from, tmp, 10, l, l, w);
 262                 break;
 263         case 12:
 264                 __constant_copy_from_user_asm(res, to, from, tmp, 12, l, l, l);
 265                 break;
 266         default:
 267                 /* we limit the inlined version to 3 moves */
 268                 return __generic_copy_from_user(to, from, n);
 269         }
 270
 271         return res;
 272 }
 273
 274 #define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3)  \
 275         asm volatile ("\n"                                              \
 276                 "       move."#s1"      (%2)+,%3\n"                     \
 277                 "11:    moves."#s1"     %3,(%1)+\n"                     \
 278                 "12:    move."#s2"      (%2)+,%3\n"                     \
 279                 "21:    moves."#s2"     %3,(%1)+\n"                     \
 280                 "22:\n"                                                 \
 281                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 282                 "       move."#s3"      (%2)+,%3\n"                     \
 283                 "31:    moves."#s3"     %3,(%1)+\n"                     \
 284                 "32:\n"                                                 \
 285                 "       .endif\n"                                       \
 286                 "4:\n"                                                  \
 287                 "\n"                                                    \
 288                 "       .section __ex_table,\"a\"\n"                    \
 289                 "       .align  4\n"                                    \
 290                 "       .long   11b,5f\n"                               \
 291                 "       .long   12b,5f\n"                               \
 292                 "       .long   21b,5f\n"                               \
 293                 "       .long   22b,5f\n"                               \
 294                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 295                 "       .long   31b,5f\n"                               \
 296                 "       .long   32b,5f\n"                               \
 297                 "       .endif\n"                                       \
 298                 "       .previous\n"                                    \
 299                 "\n"                                                    \
 300                 "       .section .fixup,\"ax\"\n"                       \
 301                 "       .even\n"                                        \
 302                 "5:     moveq.l #"#n",%0\n"                             \
 303                 "       jra     4b\n"                                   \
 304                 "       .previous\n"                                    \
 305                 : "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp)       \
 306                 : : "memory")
 307
 308 static __always_inline unsigned long
 309 __constant_copy_to_user(void __user *to, const void *from, unsigned long n)
 310 {
 311         unsigned long res = 0, tmp;
 312
 313         switch (n) {
 314         case 1:
 315                 __put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1);
 316                 break;
 317         case 2:
 318                 __put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, d, 2);
 319                 break;
 320         case 3:
 321                 __constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
 322                 break;
 323         case 4:
 324                 __put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4);
 325                 break;
 326         case 5:
 327                 __constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
 328                 break;
 329         case 6:
 330                 __constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,);
 331                 break;
 332         case 7:
 333                 __constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b);
 334                 break;
 335         case 8:
 336                 __constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,);
 337                 break;
 338         case 9:
 339                 __constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b);
 340                 break;
 341         case 10:
 342                 __constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w);
 343                 break;
 344         case 12:
 345                 __constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l);
 346                 break;
 347         default:
 348                 /* limit the inlined version to 3 moves */
 349                 return __generic_copy_to_user(to, from, n);
 350         }
 351
 352         return res;
 353 }
 354
 355 #define __copy_from_user(to, from, n)           \
 356 (__builtin_constant_p(n) ?                      \
 357  __constant_copy_from_user(to, from, n) :       \
 358  __generic_copy_from_user(to, from, n))
 359
 360 #define __copy_to_user(to, from, n)             \
 361 (__builtin_constant_p(n) ?                      \
 362  __constant_copy_to_user(to, from, n) :         \
 363  __generic_copy_to_user(to, from, n))
 364
 365 #define __copy_to_user_inatomic         __copy_to_user
 366 #define __copy_from_user_inatomic       __copy_from_user
 367
 368 #define copy_from_user(to, from, n)     __copy_from_user(to, from, n)
 369 #define copy_to_user(to, from, n)       __copy_to_user(to, from, n)
 370
 371 long strncpy_from_user(char *dst, const char __user *src, long count);
 372 long strnlen_user(const char __user *src, long n);
 373 unsigned long __clear_user(void __user *to, unsigned long n);
 374
 375 #define clear_user      __clear_user
 376
 377 #define strlen_user(str) strnlen_user(str, 32767)
 378
 379 #endif /* _M68K_UACCESS_H */