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Linux/include/linux/unaligned/generic.h

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  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 */
 70 

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