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