generic.h

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#ifndef _LINUX_UNALIGNED_GENERIC_H
#define _LINUX_UNALIGNED_GENERIC_H

/*
 * Cause a link-time error if we try an unaligned access other than
 * 1,2,4 or 8 bytes long
 */
extern void __bad_unaligned_access_size(void);

#define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({         \
    __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr),          \
    __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)),   \
    __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)),   \
    __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)),   \
    __bad_unaligned_access_size()))));                  \
    }))

#define __get_unaligned_be(ptr) ((__force typeof(*(ptr)))({         \
    __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr),          \
    __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)),   \
    __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)),   \
    __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)),   \
    __bad_unaligned_access_size()))));                  \
    }))

#define __put_unaligned_le(val, ptr) ({                 \
    void *__gu_p = (ptr);                       \
    switch (sizeof(*(ptr))) {                   \
    case 1:                             \
        *(u8 *)__gu_p = (__force u8)(val);          \
        break;                          \
    case 2:                             \
        put_unaligned_le16((__force u16)(val), __gu_p);     \
        break;                          \
    case 4:                             \
        put_unaligned_le32((__force u32)(val), __gu_p);     \
        break;                          \
    case 8:                             \
        put_unaligned_le64((__force u64)(val), __gu_p);     \
        break;                          \
    default:                            \
        __bad_unaligned_access_size();              \
        break;                          \
    }                               \
    (void)0; })

#define __put_unaligned_be(val, ptr) ({                 \
    void *__gu_p = (ptr);                       \
    switch (sizeof(*(ptr))) {                   \
    case 1:                             \
        *(u8 *)__gu_p = (__force u8)(val);          \
        break;                          \
    case 2:                             \
        put_unaligned_be16((__force u16)(val), __gu_p);     \
        break;                          \
    case 4:                             \
        put_unaligned_be32((__force u32)(val), __gu_p);     \
        break;                          \
    case 8:                             \
        put_unaligned_be64((__force u64)(val), __gu_p);     \
        break;                          \
    default:                            \
        __bad_unaligned_access_size();              \
        break;                          \
    }                               \
    (void)0; })

#endif /* _LINUX_UNALIGNED_GENERIC_H */