include/linux/unaligned/generic.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_UNALIGNED_GENERIC_H
   3 #define _LINUX_UNALIGNED_GENERIC_H
   4
   5 /*
   6  * Cause a link-time error if we try an unaligned access other than
   7  * 1,2,4 or 8 bytes long
   8  */
   9 extern void __bad_unaligned_access_size(void);
  10
  11 #define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({                     \
  12         __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr),                      \
  13         __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)),   \
  14         __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)),   \
  15         __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)),   \
  16         __bad_unaligned_access_size()))));                                      \
  17         }))
  18
  19 #define __get_unaligned_be(ptr) ((__force typeof(*(ptr)))({                     \
  20         __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr),                      \
  21         __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)),   \
  22         __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)),   \
  23         __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)),   \
  24         __bad_unaligned_access_size()))));                                      \
  25         }))
  26
  27 #define __put_unaligned_le(val, ptr) ({                                 \
  28         void *__gu_p = (ptr);                                           \
  29         switch (sizeof(*(ptr))) {                                       \
  30         case 1:                                                         \
  31                 *(u8 *)__gu_p = (__force u8)(val);                      \
  32                 break;                                                  \
  33         case 2:                                                         \
  34                 put_unaligned_le16((__force u16)(val), __gu_p);         \
  35                 break;                                                  \
  36         case 4:                                                         \
  37                 put_unaligned_le32((__force u32)(val), __gu_p);         \
  38                 break;                                                  \
  39         case 8:                                                         \
  40                 put_unaligned_le64((__force u64)(val), __gu_p);         \
  41                 break;                                                  \
  42         default:                                                        \
  43                 __bad_unaligned_access_size();                          \
  44                 break;                                                  \
  45         }                                                               \
  46         (void)0; })
  47
  48 #define __put_unaligned_be(val, ptr) ({                                 \
  49         void *__gu_p = (ptr);                                           \
  50         switch (sizeof(*(ptr))) {                                       \
  51         case 1:                                                         \
  52                 *(u8 *)__gu_p = (__force u8)(val);                      \
  53                 break;                                                  \
  54         case 2:                                                         \
  55                 put_unaligned_be16((__force u16)(val), __gu_p);         \
  56                 break;                                                  \
  57         case 4:                                                         \
  58                 put_unaligned_be32((__force u32)(val), __gu_p);         \
  59                 break;                                                  \
  60         case 8:                                                         \
  61                 put_unaligned_be64((__force u64)(val), __gu_p);         \
  62                 break;                                                  \
  63         default:                                                        \
  64                 __bad_unaligned_access_size();                          \
  65                 break;                                                  \
  66         }                                                               \
  67         (void)0; })
  68
  69 #endif /* _LINUX_UNALIGNED_GENERIC_H */