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