include/linux/unaligned/generic.h

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