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TOMOYO Linux Cross Reference
Linux/include/linux/unaligned/generic.h

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  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 */
 69 

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