arch/x86/include/asm/uaccess.h

   1 #ifndef _ASM_X86_UACCESS_H
   2 #define _ASM_X86_UACCESS_H
   3 /*
   4  * User space memory access functions
   5  */
   6 #include <linux/errno.h>
   7 #include <linux/compiler.h>
   8 #include <linux/thread_info.h>
   9 #include <linux/string.h>
  10 #include <asm/asm.h>
  11 #include <asm/page.h>
  12
  13 #define VERIFY_READ 0
  14 #define VERIFY_WRITE 1
  15
  16 /*
  17  * The fs value determines whether argument validity checking should be
  18  * performed or not.  If get_fs() == USER_DS, checking is performed, with
  19  * get_fs() == KERNEL_DS, checking is bypassed.
  20  *
  21  * For historical reasons, these macros are grossly misnamed.
  22  */
  23
  24 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  25
  26 #define KERNEL_DS       MAKE_MM_SEG(-1UL)
  27 #define USER_DS         MAKE_MM_SEG(TASK_SIZE_MAX)
  28
  29 #define get_ds()        (KERNEL_DS)
  30 #define get_fs()        (current_thread_info()->addr_limit)
  31 #define set_fs(x)       (current_thread_info()->addr_limit = (x))
  32
  33 #define segment_eq(a, b)        ((a).seg == (b).seg)
  34
  35 #define user_addr_max() (current_thread_info()->addr_limit.seg)
  36 #define __addr_ok(addr)         \
  37         ((unsigned long __force)(addr) < user_addr_max())
  38
  39 /*
  40  * Test whether a block of memory is a valid user space address.
  41  * Returns 0 if the range is valid, nonzero otherwise.
  42  *
  43  * This is equivalent to the following test:
  44  * (u33)addr + (u33)size > (u33)current->addr_limit.seg (u65 for x86_64)
  45  *
  46  * This needs 33-bit (65-bit for x86_64) arithmetic. We have a carry...
  47  */
  48
  49 #define __range_not_ok(addr, size, limit)                               \
  50 ({                                                                      \
  51         unsigned long flag, roksum;                                     \
  52         __chk_user_ptr(addr);                                           \
  53         asm("add %3,%1 ; sbb %0,%0 ; cmp %1,%4 ; sbb $0,%0"             \
  54             : "=&r" (flag), "=r" (roksum)                               \
  55             : "1" (addr), "g" ((long)(size)),                           \
  56               "rm" (limit));                                            \
  57         flag;                                                           \
  58 })
  59
  60 /**
  61  * access_ok: - Checks if a user space pointer is valid
  62  * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE.  Note that
  63  *        %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
  64  *        to write to a block, it is always safe to read from it.
  65  * @addr: User space pointer to start of block to check
  66  * @size: Size of block to check
  67  *
  68  * Context: User context only.  This function may sleep.
  69  *
  70  * Checks if a pointer to a block of memory in user space is valid.
  71  *
  72  * Returns true (nonzero) if the memory block may be valid, false (zero)
  73  * if it is definitely invalid.
  74  *
  75  * Note that, depending on architecture, this function probably just
  76  * checks that the pointer is in the user space range - after calling
  77  * this function, memory access functions may still return -EFAULT.
  78  */
  79 #define access_ok(type, addr, size) \
  80         (likely(__range_not_ok(addr, size, user_addr_max()) == 0))
  81
  82 /*
  83  * The exception table consists of pairs of addresses relative to the
  84  * exception table enty itself: the first is the address of an
  85  * instruction that is allowed to fault, and the second is the address
  86  * at which the program should continue.  No registers are modified,
  87  * so it is entirely up to the continuation code to figure out what to
  88  * do.
  89  *
  90  * All the routines below use bits of fixup code that are out of line
  91  * with the main instruction path.  This means when everything is well,
  92  * we don't even have to jump over them.  Further, they do not intrude
  93  * on our cache or tlb entries.
  94  */
  95
  96 struct exception_table_entry {
  97         int insn, fixup;
  98 };
  99 /* This is not the generic standard exception_table_entry format */
 100 #define ARCH_HAS_SORT_EXTABLE
 101 #define ARCH_HAS_SEARCH_EXTABLE
 102
 103 extern int fixup_exception(struct pt_regs *regs);
 104 extern int early_fixup_exception(unsigned long *ip);
 105
 106 /*
 107  * These are the main single-value transfer routines.  They automatically
 108  * use the right size if we just have the right pointer type.
 109  *
 110  * This gets kind of ugly. We want to return _two_ values in "get_user()"
 111  * and yet we don't want to do any pointers, because that is too much
 112  * of a performance impact. Thus we have a few rather ugly macros here,
 113  * and hide all the ugliness from the user.
 114  *
 115  * The "__xxx" versions of the user access functions are versions that
 116  * do not verify the address space, that must have been done previously
 117  * with a separate "access_ok()" call (this is used when we do multiple
 118  * accesses to the same area of user memory).
 119  */
 120
 121 extern int __get_user_1(void);
 122 extern int __get_user_2(void);
 123 extern int __get_user_4(void);
 124 extern int __get_user_8(void);
 125 extern int __get_user_bad(void);
 126
 127 #define __get_user_x(size, ret, x, ptr)               \
 128         asm volatile("call __get_user_" #size         \
 129                      : "=a" (ret), "=d" (x)           \
 130                      : "0" (ptr))                     \
 131
 132 /* Careful: we have to cast the result to the type of the pointer
 133  * for sign reasons */
 134
 135 /**
 136  * get_user: - Get a simple variable from user space.
 137  * @x:   Variable to store result.
 138  * @ptr: Source address, in user space.
 139  *
 140  * Context: User context only.  This function may sleep.
 141  *
 142  * This macro copies a single simple variable from user space to kernel
 143  * space.  It supports simple types like char and int, but not larger
 144  * data types like structures or arrays.
 145  *
 146  * @ptr must have pointer-to-simple-variable type, and the result of
 147  * dereferencing @ptr must be assignable to @x without a cast.
 148  *
 149  * Returns zero on success, or -EFAULT on error.
 150  * On error, the variable @x is set to zero.
 151  */
 152 #ifdef CONFIG_X86_32
 153 #define __get_user_8(__ret_gu, __val_gu, ptr)                           \
 154                 __get_user_x(X, __ret_gu, __val_gu, ptr)
 155 #else
 156 #define __get_user_8(__ret_gu, __val_gu, ptr)                           \
 157                 __get_user_x(8, __ret_gu, __val_gu, ptr)
 158 #endif
 159
 160 #define get_user(x, ptr)                                                \
 161 ({                                                                      \
 162         int __ret_gu;                                                   \
 163         unsigned long __val_gu;                                         \
 164         __chk_user_ptr(ptr);                                            \
 165         might_fault();                                                  \
 166         switch (sizeof(*(ptr))) {                                       \
 167         case 1:                                                         \
 168                 __get_user_x(1, __ret_gu, __val_gu, ptr);               \
 169                 break;                                                  \
 170         case 2:                                                         \
 171                 __get_user_x(2, __ret_gu, __val_gu, ptr);               \
 172                 break;                                                  \
 173         case 4:                                                         \
 174                 __get_user_x(4, __ret_gu, __val_gu, ptr);               \
 175                 break;                                                  \
 176         case 8:                                                         \
 177                 __get_user_8(__ret_gu, __val_gu, ptr);                  \
 178                 break;                                                  \
 179         default:                                                        \
 180                 __get_user_x(X, __ret_gu, __val_gu, ptr);               \
 181                 break;                                                  \
 182         }                                                               \
 183         (x) = (__typeof__(*(ptr)))__val_gu;                             \
 184         __ret_gu;                                                       \
 185 })
 186
 187 #define __put_user_x(size, x, ptr, __ret_pu)                    \
 188         asm volatile("call __put_user_" #size : "=a" (__ret_pu) \
 189                      : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
 190
 191
 192
 193 #ifdef CONFIG_X86_32
 194 #define __put_user_asm_u64(x, addr, err, errret)                        \
 195         asm volatile("1:        movl %%eax,0(%2)\n"                     \
 196                      "2:        movl %%edx,4(%2)\n"                     \
 197                      "3:\n"                                             \
 198                      ".section .fixup,\"ax\"\n"                         \
 199                      "4:        movl %3,%0\n"                           \
 200                      "  jmp 3b\n"                                       \
 201                      ".previous\n"                                      \
 202                      _ASM_EXTABLE(1b, 4b)                               \
 203                      _ASM_EXTABLE(2b, 4b)                               \
 204                      : "=r" (err)                                       \
 205                      : "A" (x), "r" (addr), "i" (errret), "0" (err))
 206
 207 #define __put_user_asm_ex_u64(x, addr)                                  \
 208         asm volatile("1:        movl %%eax,0(%1)\n"                     \
 209                      "2:        movl %%edx,4(%1)\n"                     \
 210                      "3:\n"                                             \
 211                      _ASM_EXTABLE_EX(1b, 2b)                            \
 212                      _ASM_EXTABLE_EX(2b, 3b)                            \
 213                      : : "A" (x), "r" (addr))
 214
 215 #define __put_user_x8(x, ptr, __ret_pu)                         \
 216         asm volatile("call __put_user_8" : "=a" (__ret_pu)      \
 217                      : "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
 218 #else
 219 #define __put_user_asm_u64(x, ptr, retval, errret) \
 220         __put_user_asm(x, ptr, retval, "q", "", "er", errret)
 221 #define __put_user_asm_ex_u64(x, addr)  \
 222         __put_user_asm_ex(x, addr, "q", "", "er")
 223 #define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
 224 #endif
 225
 226 extern void __put_user_bad(void);
 227
 228 /*
 229  * Strange magic calling convention: pointer in %ecx,
 230  * value in %eax(:%edx), return value in %eax. clobbers %rbx
 231  */
 232 extern void __put_user_1(void);
 233 extern void __put_user_2(void);
 234 extern void __put_user_4(void);
 235 extern void __put_user_8(void);
 236
 237 #ifdef CONFIG_X86_WP_WORKS_OK
 238
 239 /**
 240  * put_user: - Write a simple value into user space.
 241  * @x:   Value to copy to user space.
 242  * @ptr: Destination address, in user space.
 243  *
 244  * Context: User context only.  This function may sleep.
 245  *
 246  * This macro copies a single simple value from kernel space to user
 247  * space.  It supports simple types like char and int, but not larger
 248  * data types like structures or arrays.
 249  *
 250  * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 251  * to the result of dereferencing @ptr.
 252  *
 253  * Returns zero on success, or -EFAULT on error.
 254  */
 255 #define put_user(x, ptr)                                        \
 256 ({                                                              \
 257         int __ret_pu;                                           \
 258         __typeof__(*(ptr)) __pu_val;                            \
 259         __chk_user_ptr(ptr);                                    \
 260         might_fault();                                          \
 261         __pu_val = x;                                           \
 262         switch (sizeof(*(ptr))) {                               \
 263         case 1:                                                 \
 264                 __put_user_x(1, __pu_val, ptr, __ret_pu);       \
 265                 break;                                          \
 266         case 2:                                                 \
 267                 __put_user_x(2, __pu_val, ptr, __ret_pu);       \
 268                 break;                                          \
 269         case 4:                                                 \
 270                 __put_user_x(4, __pu_val, ptr, __ret_pu);       \
 271                 break;                                          \
 272         case 8:                                                 \
 273                 __put_user_x8(__pu_val, ptr, __ret_pu);         \
 274                 break;                                          \
 275         default:                                                \
 276                 __put_user_x(X, __pu_val, ptr, __ret_pu);       \
 277                 break;                                          \
 278         }                                                       \
 279         __ret_pu;                                               \
 280 })
 281
 282 #define __put_user_size(x, ptr, size, retval, errret)                   \
 283 do {                                                                    \
 284         retval = 0;                                                     \
 285         __chk_user_ptr(ptr);                                            \
 286         switch (size) {                                                 \
 287         case 1:                                                         \
 288                 __put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \
 289                 break;                                                  \
 290         case 2:                                                         \
 291                 __put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \
 292                 break;                                                  \
 293         case 4:                                                         \
 294                 __put_user_asm(x, ptr, retval, "l", "k", "ir", errret); \
 295                 break;                                                  \
 296         case 8:                                                         \
 297                 __put_user_asm_u64((__typeof__(*ptr))(x), ptr, retval,  \
 298                                    errret);                             \
 299                 break;                                                  \
 300         default:                                                        \
 301                 __put_user_bad();                                       \
 302         }                                                               \
 303 } while (0)
 304
 305 #define __put_user_size_ex(x, ptr, size)                                \
 306 do {                                                                    \
 307         __chk_user_ptr(ptr);                                            \
 308         switch (size) {                                                 \
 309         case 1:                                                         \
 310                 __put_user_asm_ex(x, ptr, "b", "b", "iq");              \
 311                 break;                                                  \
 312         case 2:                                                         \
 313                 __put_user_asm_ex(x, ptr, "w", "w", "ir");              \
 314                 break;                                                  \
 315         case 4:                                                         \
 316                 __put_user_asm_ex(x, ptr, "l", "k", "ir");              \
 317                 break;                                                  \
 318         case 8:                                                         \
 319                 __put_user_asm_ex_u64((__typeof__(*ptr))(x), ptr);      \
 320                 break;                                                  \
 321         default:                                                        \
 322                 __put_user_bad();                                       \
 323         }                                                               \
 324 } while (0)
 325
 326 #else
 327
 328 #define __put_user_size(x, ptr, size, retval, errret)                   \
 329 do {                                                                    \
 330         __typeof__(*(ptr))__pus_tmp = x;                                \
 331         retval = 0;                                                     \
 332                                                                         \
 333         if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0))    \
 334                 retval = errret;                                        \
 335 } while (0)
 336
 337 #define put_user(x, ptr)                                        \
 338 ({                                                              \
 339         int __ret_pu;                                           \
 340         __typeof__(*(ptr))__pus_tmp = x;                        \
 341         __ret_pu = 0;                                           \
 342         if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp,         \
 343                                        sizeof(*(ptr))) != 0))   \
 344                 __ret_pu = -EFAULT;                             \
 345         __ret_pu;                                               \
 346 })
 347 #endif
 348
 349 #ifdef CONFIG_X86_32
 350 #define __get_user_asm_u64(x, ptr, retval, errret)      (x) = __get_user_bad()
 351 #define __get_user_asm_ex_u64(x, ptr)                   (x) = __get_user_bad()
 352 #else
 353 #define __get_user_asm_u64(x, ptr, retval, errret) \
 354          __get_user_asm(x, ptr, retval, "q", "", "=r", errret)
 355 #define __get_user_asm_ex_u64(x, ptr) \
 356          __get_user_asm_ex(x, ptr, "q", "", "=r")
 357 #endif
 358
 359 #define __get_user_size(x, ptr, size, retval, errret)                   \
 360 do {                                                                    \
 361         retval = 0;                                                     \
 362         __chk_user_ptr(ptr);                                            \
 363         switch (size) {                                                 \
 364         case 1:                                                         \
 365                 __get_user_asm(x, ptr, retval, "b", "b", "=q", errret); \
 366                 break;                                                  \
 367         case 2:                                                         \
 368                 __get_user_asm(x, ptr, retval, "w", "w", "=r", errret); \
 369                 break;                                                  \
 370         case 4:                                                         \
 371                 __get_user_asm(x, ptr, retval, "l", "k", "=r", errret); \
 372                 break;                                                  \
 373         case 8:                                                         \
 374                 __get_user_asm_u64(x, ptr, retval, errret);             \
 375                 break;                                                  \
 376         default:                                                        \
 377                 (x) = __get_user_bad();                                 \
 378         }                                                               \
 379 } while (0)
 380
 381 #define __get_user_asm(x, addr, err, itype, rtype, ltype, errret)       \
 382         asm volatile("1:        mov"itype" %2,%"rtype"1\n"              \
 383                      "2:\n"                                             \
 384                      ".section .fixup,\"ax\"\n"                         \
 385                      "3:        mov %3,%0\n"                            \
 386                      "  xor"itype" %"rtype"1,%"rtype"1\n"               \
 387                      "  jmp 2b\n"                                       \
 388                      ".previous\n"                                      \
 389                      _ASM_EXTABLE(1b, 3b)                               \
 390                      : "=r" (err), ltype(x)                             \
 391                      : "m" (__m(addr)), "i" (errret), "0" (err))
 392
 393 #define __get_user_size_ex(x, ptr, size)                                \
 394 do {                                                                    \
 395         __chk_user_ptr(ptr);                                            \
 396         switch (size) {                                                 \
 397         case 1:                                                         \
 398                 __get_user_asm_ex(x, ptr, "b", "b", "=q");              \
 399                 break;                                                  \
 400         case 2:                                                         \
 401                 __get_user_asm_ex(x, ptr, "w", "w", "=r");              \
 402                 break;                                                  \
 403         case 4:                                                         \
 404                 __get_user_asm_ex(x, ptr, "l", "k", "=r");              \
 405                 break;                                                  \
 406         case 8:                                                         \
 407                 __get_user_asm_ex_u64(x, ptr);                          \
 408                 break;                                                  \
 409         default:                                                        \
 410                 (x) = __get_user_bad();                                 \
 411         }                                                               \
 412 } while (0)
 413
 414 #define __get_user_asm_ex(x, addr, itype, rtype, ltype)                 \
 415         asm volatile("1:        mov"itype" %1,%"rtype"0\n"              \
 416                      "2:\n"                                             \
 417                      _ASM_EXTABLE_EX(1b, 2b)                            \
 418                      : ltype(x) : "m" (__m(addr)))
 419
 420 #define __put_user_nocheck(x, ptr, size)                        \
 421 ({                                                              \
 422         int __pu_err;                                           \
 423         __put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
 424         __pu_err;                                               \
 425 })
 426
 427 #define __get_user_nocheck(x, ptr, size)                                \
 428 ({                                                                      \
 429         int __gu_err;                                                   \
 430         unsigned long __gu_val;                                         \
 431         __get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT);    \
 432         (x) = (__force __typeof__(*(ptr)))__gu_val;                     \
 433         __gu_err;                                                       \
 434 })
 435
 436 /* FIXME: this hack is definitely wrong -AK */
 437 struct __large_struct { unsigned long buf[100]; };
 438 #define __m(x) (*(struct __large_struct __user *)(x))
 439
 440 /*
 441  * Tell gcc we read from memory instead of writing: this is because
 442  * we do not write to any memory gcc knows about, so there are no
 443  * aliasing issues.
 444  */
 445 #define __put_user_asm(x, addr, err, itype, rtype, ltype, errret)       \
 446         asm volatile("1:        mov"itype" %"rtype"1,%2\n"              \
 447                      "2:\n"                                             \
 448                      ".section .fixup,\"ax\"\n"                         \
 449                      "3:        mov %3,%0\n"                            \
 450                      "  jmp 2b\n"                                       \
 451                      ".previous\n"                                      \
 452                      _ASM_EXTABLE(1b, 3b)                               \
 453                      : "=r"(err)                                        \
 454                      : ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
 455
 456 #define __put_user_asm_ex(x, addr, itype, rtype, ltype)                 \
 457         asm volatile("1:        mov"itype" %"rtype"0,%1\n"              \
 458                      "2:\n"                                             \
 459                      _ASM_EXTABLE_EX(1b, 2b)                            \
 460                      : : ltype(x), "m" (__m(addr)))
 461
 462 /*
 463  * uaccess_try and catch
 464  */
 465 #define uaccess_try     do {                                            \
 466         int prev_err = current_thread_info()->uaccess_err;              \
 467         current_thread_info()->uaccess_err = 0;                         \
 468         barrier();
 469
 470 #define uaccess_catch(err)                                              \
 471         (err) |= (current_thread_info()->uaccess_err ? -EFAULT : 0);    \
 472         current_thread_info()->uaccess_err = prev_err;                  \
 473 } while (0)
 474
 475 /**
 476  * __get_user: - Get a simple variable from user space, with less checking.
 477  * @x:   Variable to store result.
 478  * @ptr: Source address, in user space.
 479  *
 480  * Context: User context only.  This function may sleep.
 481  *
 482  * This macro copies a single simple variable from user space to kernel
 483  * space.  It supports simple types like char and int, but not larger
 484  * data types like structures or arrays.
 485  *
 486  * @ptr must have pointer-to-simple-variable type, and the result of
 487  * dereferencing @ptr must be assignable to @x without a cast.
 488  *
 489  * Caller must check the pointer with access_ok() before calling this
 490  * function.
 491  *
 492  * Returns zero on success, or -EFAULT on error.
 493  * On error, the variable @x is set to zero.
 494  */
 495
 496 #define __get_user(x, ptr)                                              \
 497         __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
 498
 499 /**
 500  * __put_user: - Write a simple value into user space, with less checking.
 501  * @x:   Value to copy to user space.
 502  * @ptr: Destination address, in user space.
 503  *
 504  * Context: User context only.  This function may sleep.
 505  *
 506  * This macro copies a single simple value from kernel space to user
 507  * space.  It supports simple types like char and int, but not larger
 508  * data types like structures or arrays.
 509  *
 510  * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 511  * to the result of dereferencing @ptr.
 512  *
 513  * Caller must check the pointer with access_ok() before calling this
 514  * function.
 515  *
 516  * Returns zero on success, or -EFAULT on error.
 517  */
 518
 519 #define __put_user(x, ptr)                                              \
 520         __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
 521
 522 #define __get_user_unaligned __get_user
 523 #define __put_user_unaligned __put_user
 524
 525 /*
 526  * {get|put}_user_try and catch
 527  *
 528  * get_user_try {
 529  *      get_user_ex(...);
 530  * } get_user_catch(err)
 531  */
 532 #define get_user_try            uaccess_try
 533 #define get_user_catch(err)     uaccess_catch(err)
 534
 535 #define get_user_ex(x, ptr)     do {                                    \
 536         unsigned long __gue_val;                                        \
 537         __get_user_size_ex((__gue_val), (ptr), (sizeof(*(ptr))));       \
 538         (x) = (__force __typeof__(*(ptr)))__gue_val;                    \
 539 } while (0)
 540
 541 #ifdef CONFIG_X86_WP_WORKS_OK
 542
 543 #define put_user_try            uaccess_try
 544 #define put_user_catch(err)     uaccess_catch(err)
 545
 546 #define put_user_ex(x, ptr)                                             \
 547         __put_user_size_ex((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
 548
 549 #else /* !CONFIG_X86_WP_WORKS_OK */
 550
 551 #define put_user_try            do {            \
 552         int __uaccess_err = 0;
 553
 554 #define put_user_catch(err)                     \
 555         (err) |= __uaccess_err;                 \
 556 } while (0)
 557
 558 #define put_user_ex(x, ptr)     do {            \
 559         __uaccess_err |= __put_user(x, ptr);    \
 560 } while (0)
 561
 562 #endif /* CONFIG_X86_WP_WORKS_OK */
 563
 564 extern unsigned long
 565 copy_from_user_nmi(void *to, const void __user *from, unsigned long n);
 566 extern __must_check long
 567 strncpy_from_user(char *dst, const char __user *src, long count);
 568
 569 extern __must_check long strlen_user(const char __user *str);
 570 extern __must_check long strnlen_user(const char __user *str, long n);
 571
 572 /*
 573  * movsl can be slow when source and dest are not both 8-byte aligned
 574  */
 575 #ifdef CONFIG_X86_INTEL_USERCOPY
 576 extern struct movsl_mask {
 577         int mask;
 578 } ____cacheline_aligned_in_smp movsl_mask;
 579 #endif
 580
 581 #define ARCH_HAS_NOCACHE_UACCESS 1
 582
 583 #ifdef CONFIG_X86_32
 584 # include "uaccess_32.h"
 585 #else
 586 # include "uaccess_64.h"
 587 #endif
 588
 589 #endif /* _ASM_X86_UACCESS_H */
 590