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