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C/C++ Source or Header  |  2008-12-24  |  2.1 KB  |  69 lines
  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.