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/types.h>
   9 #include <asm/segment.h>
  10
  11 /* We let the MMU do all checking */
  12 static inline int access_ok(int type, const void __user *addr,
  13                             unsigned long size)
  14 {
  15         return 1;
  16 }
  17
  18 /*
  19  * Not all varients of the 68k family support the notion of address spaces.
  20  * The traditional 680x0 parts do, and they use the sfc/dfc registers and
  21  * the "moves" instruction to access user space from kernel space. Other
  22  * family members like ColdFire don't support this, and only have a single
  23  * address space, and use the usual "move" instruction for user space access.
  24  *
  25  * Outside of this difference the user space access functions are the same.
  26  * So lets keep the code simple and just define in what we need to use.
  27  */
  28 #ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
  29 #define MOVES   "moves"
  30 #else
  31 #define MOVES   "move"
  32 #endif
  33
  34 extern int __put_user_bad(void);
  35 extern int __get_user_bad(void);
  36
  37 #define __put_user_asm(res, x, ptr, bwl, reg, err)      \
  38 asm volatile ("\n"                                      \
  39         "1:     "MOVES"."#bwl"  %2,%1\n"                \
  40         "2:\n"                                          \
  41         "       .section .fixup,\"ax\"\n"               \
  42         "       .even\n"                                \
  43         "10:    moveq.l %3,%0\n"                        \
  44         "       jra 2b\n"                               \
  45         "       .previous\n"                            \
  46         "\n"                                            \
  47         "       .section __ex_table,\"a\"\n"            \
  48         "       .align  4\n"                            \
  49         "       .long   1b,10b\n"                       \
  50         "       .long   2b,10b\n"                       \
  51         "       .previous"                              \
  52         : "+d" (res), "=m" (*(ptr))                     \
  53         : #reg (x), "i" (err))
  54
  55 /*
  56  * These are the main single-value transfer routines.  They automatically
  57  * use the right size if we just have the right pointer type.
  58  */
  59
  60 #define __put_user(x, ptr)                                              \
  61 ({                                                                      \
  62         typeof(*(ptr)) __pu_val = (x);                                  \
  63         int __pu_err = 0;                                               \
  64         __chk_user_ptr(ptr);                                            \
  65         switch (sizeof (*(ptr))) {                                      \
  66         case 1:                                                         \
  67                 __put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \
  68                 break;                                                  \
  69         case 2:                                                         \
  70                 __put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT); \
  71                 break;                                                  \
  72         case 4:                                                         \
  73                 __put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \
  74                 break;                                                  \
  75         case 8:                                                         \
  76             {                                                           \
  77                 const void __user *__pu_ptr = (ptr);                    \
  78                 asm volatile ("\n"                                      \
  79                         "1:     "MOVES".l       %2,(%1)+\n"             \
  80                         "2:     "MOVES".l       %R2,(%1)\n"             \
  81                         "3:\n"                                          \
  82                         "       .section .fixup,\"ax\"\n"               \
  83                         "       .even\n"                                \
  84                         "10:    movel %3,%0\n"                          \
  85                         "       jra 3b\n"                               \
  86                         "       .previous\n"                            \
  87                         "\n"                                            \
  88                         "       .section __ex_table,\"a\"\n"            \
  89                         "       .align 4\n"                             \
  90                         "       .long 1b,10b\n"                         \
  91                         "       .long 2b,10b\n"                         \
  92                         "       .long 3b,10b\n"                         \
  93                         "       .previous"                              \
  94                         : "+d" (__pu_err), "+a" (__pu_ptr)              \
  95                         : "r" (__pu_val), "i" (-EFAULT)                 \
  96                         : "memory");                                    \
  97                 break;                                                  \
  98             }                                                           \
  99         default:                                                        \
 100                 __pu_err = __put_user_bad();                            \
 101                 break;                                                  \
 102         }                                                               \
 103         __pu_err;                                                       \
 104 })
 105 #define put_user(x, ptr)        __put_user(x, ptr)
 106
 107
 108 #define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({             \
 109         type __gu_val;                                                  \
 110         asm volatile ("\n"                                              \
 111                 "1:     "MOVES"."#bwl"  %2,%1\n"                        \
 112                 "2:\n"                                                  \
 113                 "       .section .fixup,\"ax\"\n"                       \
 114                 "       .even\n"                                        \
 115                 "10:    move.l  %3,%0\n"                                \
 116                 "       sub.l   %1,%1\n"                                \
 117                 "       jra     2b\n"                                   \
 118                 "       .previous\n"                                    \
 119                 "\n"                                                    \
 120                 "       .section __ex_table,\"a\"\n"                    \
 121                 "       .align  4\n"                                    \
 122                 "       .long   1b,10b\n"                               \
 123                 "       .previous"                                      \
 124                 : "+d" (res), "=&" #reg (__gu_val)                      \
 125                 : "m" (*(ptr)), "i" (err));                             \
 126         (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val;  \
 127 })
 128
 129 #define __get_user(x, ptr)                                              \
 130 ({                                                                      \
 131         int __gu_err = 0;                                               \
 132         __chk_user_ptr(ptr);                                            \
 133         switch (sizeof(*(ptr))) {                                       \
 134         case 1:                                                         \
 135                 __get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT);    \
 136                 break;                                                  \
 137         case 2:                                                         \
 138                 __get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT);   \
 139                 break;                                                  \
 140         case 4:                                                         \
 141                 __get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT);   \
 142                 break;                                                  \
 143 /*      case 8: disabled because gcc-4.1 has a broken typeof            \
 144             {                                                           \
 145                 const void *__gu_ptr = (ptr);                           \
 146                 u64 __gu_val;                                           \
 147                 asm volatile ("\n"                                      \
 148                         "1:     "MOVES".l       (%2)+,%1\n"             \
 149                         "2:     "MOVES".l       (%2),%R1\n"             \
 150                         "3:\n"                                          \
 151                         "       .section .fixup,\"ax\"\n"               \
 152                         "       .even\n"                                \
 153                         "10:    move.l  %3,%0\n"                        \
 154                         "       sub.l   %1,%1\n"                        \
 155                         "       sub.l   %R1,%R1\n"                      \
 156                         "       jra     3b\n"                           \
 157                         "       .previous\n"                            \
 158                         "\n"                                            \
 159                         "       .section __ex_table,\"a\"\n"            \
 160                         "       .align  4\n"                            \
 161                         "       .long   1b,10b\n"                       \
 162                         "       .long   2b,10b\n"                       \
 163                         "       .previous"                              \
 164                         : "+d" (__gu_err), "=&r" (__gu_val),            \
 165                           "+a" (__gu_ptr)                               \
 166                         : "i" (-EFAULT)                                 \
 167                         : "memory");                                    \
 168                 (x) = (__force typeof(*(ptr)))__gu_val;                 \
 169                 break;                                                  \
 170             }   */                                                      \
 171         default:                                                        \
 172                 __gu_err = __get_user_bad();                            \
 173                 break;                                                  \
 174         }                                                               \
 175         __gu_err;                                                       \
 176 })
 177 #define get_user(x, ptr) __get_user(x, ptr)
 178
 179 unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n);
 180 unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n);
 181
 182 #define __suffix0
 183 #define __suffix1 b
 184 #define __suffix2 w
 185 #define __suffix4 l
 186
 187 #define ____constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)\
 188         asm volatile ("\n"                                              \
 189                 "1:     "MOVES"."#s1"   (%2)+,%3\n"                     \
 190                 "       move."#s1"      %3,(%1)+\n"                     \
 191                 "       .ifnc   \""#s2"\",\"\"\n"                       \
 192                 "2:     "MOVES"."#s2"   (%2)+,%3\n"                     \
 193                 "       move."#s2"      %3,(%1)+\n"                     \
 194                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 195                 "3:     "MOVES"."#s3"   (%2)+,%3\n"                     \
 196                 "       move."#s3"      %3,(%1)+\n"                     \
 197                 "       .endif\n"                                       \
 198                 "       .endif\n"                                       \
 199                 "4:\n"                                                  \
 200                 "       .section __ex_table,\"a\"\n"                    \
 201                 "       .align  4\n"                                    \
 202                 "       .long   1b,10f\n"                               \
 203                 "       .ifnc   \""#s2"\",\"\"\n"                       \
 204                 "       .long   2b,20f\n"                               \
 205                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 206                 "       .long   3b,30f\n"                               \
 207                 "       .endif\n"                                       \
 208                 "       .endif\n"                                       \
 209                 "       .previous\n"                                    \
 210                 "\n"                                                    \
 211                 "       .section .fixup,\"ax\"\n"                       \
 212                 "       .even\n"                                        \
 213                 "10:    addq.l #"#n1",%0\n"                             \
 214                 "       .ifnc   \""#s2"\",\"\"\n"                       \
 215                 "20:    addq.l #"#n2",%0\n"                             \
 216                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 217                 "30:    addq.l #"#n3",%0\n"                             \
 218                 "       .endif\n"                                       \
 219                 "       .endif\n"                                       \
 220                 "       jra     4b\n"                                   \
 221                 "       .previous\n"                                    \
 222                 : "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp)      \
 223                 : : "memory")
 224
 225 #define ___constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)\
 226         ____constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)
 227 #define __constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3)   \
 228         ___constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3,  \
 229                                         __suffix##n1, __suffix##n2, __suffix##n3)
 230
 231 static __always_inline unsigned long
 232 __constant_copy_from_user(void *to, const void __user *from, unsigned long n)
 233 {
 234         unsigned long res = 0, tmp;
 235
 236         switch (n) {
 237         case 1:
 238                 __constant_copy_from_user_asm(res, to, from, tmp, 1, 0, 0);
 239                 break;
 240         case 2:
 241                 __constant_copy_from_user_asm(res, to, from, tmp, 2, 0, 0);
 242                 break;
 243         case 3:
 244                 __constant_copy_from_user_asm(res, to, from, tmp, 2, 1, 0);
 245                 break;
 246         case 4:
 247                 __constant_copy_from_user_asm(res, to, from, tmp, 4, 0, 0);
 248                 break;
 249         case 5:
 250                 __constant_copy_from_user_asm(res, to, from, tmp, 4, 1, 0);
 251                 break;
 252         case 6:
 253                 __constant_copy_from_user_asm(res, to, from, tmp, 4, 2, 0);
 254                 break;
 255         case 7:
 256                 __constant_copy_from_user_asm(res, to, from, tmp, 4, 2, 1);
 257                 break;
 258         case 8:
 259                 __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 0);
 260                 break;
 261         case 9:
 262                 __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 1);
 263                 break;
 264         case 10:
 265                 __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 2);
 266                 break;
 267         case 12:
 268                 __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 4);
 269                 break;
 270         default:
 271                 /* we limit the inlined version to 3 moves */
 272                 return __generic_copy_from_user(to, from, n);
 273         }
 274
 275         return res;
 276 }
 277
 278 #define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3)  \
 279         asm volatile ("\n"                                              \
 280                 "       move."#s1"      (%2)+,%3\n"                     \
 281                 "11:    "MOVES"."#s1"   %3,(%1)+\n"                     \
 282                 "12:    move."#s2"      (%2)+,%3\n"                     \
 283                 "21:    "MOVES"."#s2"   %3,(%1)+\n"                     \
 284                 "22:\n"                                                 \
 285                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 286                 "       move."#s3"      (%2)+,%3\n"                     \
 287                 "31:    "MOVES"."#s3"   %3,(%1)+\n"                     \
 288                 "32:\n"                                                 \
 289                 "       .endif\n"                                       \
 290                 "4:\n"                                                  \
 291                 "\n"                                                    \
 292                 "       .section __ex_table,\"a\"\n"                    \
 293                 "       .align  4\n"                                    \
 294                 "       .long   11b,5f\n"                               \
 295                 "       .long   12b,5f\n"                               \
 296                 "       .long   21b,5f\n"                               \
 297                 "       .long   22b,5f\n"                               \
 298                 "       .ifnc   \""#s3"\",\"\"\n"                       \
 299                 "       .long   31b,5f\n"                               \
 300                 "       .long   32b,5f\n"                               \
 301                 "       .endif\n"                                       \
 302                 "       .previous\n"                                    \
 303                 "\n"                                                    \
 304                 "       .section .fixup,\"ax\"\n"                       \
 305                 "       .even\n"                                        \
 306                 "5:     moveq.l #"#n",%0\n"                             \
 307                 "       jra     4b\n"                                   \
 308                 "       .previous\n"                                    \
 309                 : "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp)       \
 310                 : : "memory")
 311
 312 static __always_inline unsigned long
 313 __constant_copy_to_user(void __user *to, const void *from, unsigned long n)
 314 {
 315         unsigned long res = 0, tmp;
 316
 317         switch (n) {
 318         case 1:
 319                 __put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1);
 320                 break;
 321         case 2:
 322                 __put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, r, 2);
 323                 break;
 324         case 3:
 325                 __constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
 326                 break;
 327         case 4:
 328                 __put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4);
 329                 break;
 330         case 5:
 331                 __constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
 332                 break;
 333         case 6:
 334                 __constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,);
 335                 break;
 336         case 7:
 337                 __constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b);
 338                 break;
 339         case 8:
 340                 __constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,);
 341                 break;
 342         case 9:
 343                 __constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b);
 344                 break;
 345         case 10:
 346                 __constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w);
 347                 break;
 348         case 12:
 349                 __constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l);
 350                 break;
 351         default:
 352                 /* limit the inlined version to 3 moves */
 353                 return __generic_copy_to_user(to, from, n);
 354         }
 355
 356         return res;
 357 }
 358
 359 static inline unsigned long
 360 raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 361 {
 362         if (__builtin_constant_p(n))
 363                 return __constant_copy_from_user(to, from, n);
 364         return __generic_copy_from_user(to, from, n);
 365 }
 366
 367 static inline unsigned long
 368 raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 369 {
 370         if (__builtin_constant_p(n))
 371                 return __constant_copy_to_user(to, from, n);
 372         return __generic_copy_to_user(to, from, n);
 373 }
 374 #define INLINE_COPY_FROM_USER
 375 #define INLINE_COPY_TO_USER
 376
 377 #define user_addr_max() \
 378         (uaccess_kernel() ? ~0UL : TASK_SIZE)
 379
 380 extern long strncpy_from_user(char *dst, const char __user *src, long count);
 381 extern __must_check long strnlen_user(const char __user *str, long n);
 382
 383 unsigned long __clear_user(void __user *to, unsigned long n);
 384
 385 #define clear_user      __clear_user
 386
 387 #endif /* _M68K_UACCESS_H */