| 648db22b |
1 | #ifndef ASM_UNALIGNED_H |
| 2 | #define ASM_UNALIGNED_H |
| 3 | |
| 4 | #include <assert.h> |
| 5 | #include <linux/types.h> |
| 6 | |
| 7 | #ifndef __LITTLE_ENDIAN |
| 8 | # if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || defined(__LITTLE_ENDIAN__) |
| 9 | # define __LITTLE_ENDIAN 1 |
| 10 | # endif |
| 11 | #endif |
| 12 | |
| 13 | #ifdef __LITTLE_ENDIAN |
| 14 | # define _IS_LITTLE_ENDIAN 1 |
| 15 | #else |
| 16 | # define _IS_LITTLE_ENDIAN 0 |
| 17 | #endif |
| 18 | |
| 19 | static unsigned _isLittleEndian(void) |
| 20 | { |
| 21 | const union { uint32_t u; uint8_t c[4]; } one = { 1 }; |
| 22 | assert(_IS_LITTLE_ENDIAN == one.c[0]); |
| 23 | (void)one; |
| 24 | return _IS_LITTLE_ENDIAN; |
| 25 | } |
| 26 | |
| 27 | static uint16_t _swap16(uint16_t in) |
| 28 | { |
| 29 | return ((in & 0xF) << 8) + ((in & 0xF0) >> 8); |
| 30 | } |
| 31 | |
| 32 | static uint32_t _swap32(uint32_t in) |
| 33 | { |
| 34 | return __builtin_bswap32(in); |
| 35 | } |
| 36 | |
| 37 | static uint64_t _swap64(uint64_t in) |
| 38 | { |
| 39 | return __builtin_bswap64(in); |
| 40 | } |
| 41 | |
| 42 | /* Little endian */ |
| 43 | static uint16_t get_unaligned_le16(const void* memPtr) |
| 44 | { |
| 45 | uint16_t val; |
| 46 | __builtin_memcpy(&val, memPtr, sizeof(val)); |
| 47 | if (!_isLittleEndian()) _swap16(val); |
| 48 | return val; |
| 49 | } |
| 50 | |
| 51 | static uint32_t get_unaligned_le32(const void* memPtr) |
| 52 | { |
| 53 | uint32_t val; |
| 54 | __builtin_memcpy(&val, memPtr, sizeof(val)); |
| 55 | if (!_isLittleEndian()) _swap32(val); |
| 56 | return val; |
| 57 | } |
| 58 | |
| 59 | static uint64_t get_unaligned_le64(const void* memPtr) |
| 60 | { |
| 61 | uint64_t val; |
| 62 | __builtin_memcpy(&val, memPtr, sizeof(val)); |
| 63 | if (!_isLittleEndian()) _swap64(val); |
| 64 | return val; |
| 65 | } |
| 66 | |
| 67 | static void put_unaligned_le16(uint16_t value, void* memPtr) |
| 68 | { |
| 69 | if (!_isLittleEndian()) value = _swap16(value); |
| 70 | __builtin_memcpy(memPtr, &value, sizeof(value)); |
| 71 | } |
| 72 | |
| 73 | static void put_unaligned_le32(uint32_t value, void* memPtr) |
| 74 | { |
| 75 | if (!_isLittleEndian()) value = _swap32(value); |
| 76 | __builtin_memcpy(memPtr, &value, sizeof(value)); |
| 77 | } |
| 78 | |
| 79 | static void put_unaligned_le64(uint64_t value, void* memPtr) |
| 80 | { |
| 81 | if (!_isLittleEndian()) value = _swap64(value); |
| 82 | __builtin_memcpy(memPtr, &value, sizeof(value)); |
| 83 | } |
| 84 | |
| 85 | /* big endian */ |
| 86 | static uint32_t get_unaligned_be32(const void* memPtr) |
| 87 | { |
| 88 | uint32_t val; |
| 89 | __builtin_memcpy(&val, memPtr, sizeof(val)); |
| 90 | if (_isLittleEndian()) _swap32(val); |
| 91 | return val; |
| 92 | } |
| 93 | |
| 94 | static uint64_t get_unaligned_be64(const void* memPtr) |
| 95 | { |
| 96 | uint64_t val; |
| 97 | __builtin_memcpy(&val, memPtr, sizeof(val)); |
| 98 | if (_isLittleEndian()) _swap64(val); |
| 99 | return val; |
| 100 | } |
| 101 | |
| 102 | static void put_unaligned_be32(uint32_t value, void* memPtr) |
| 103 | { |
| 104 | if (_isLittleEndian()) value = _swap32(value); |
| 105 | __builtin_memcpy(memPtr, &value, sizeof(value)); |
| 106 | } |
| 107 | |
| 108 | static void put_unaligned_be64(uint64_t value, void* memPtr) |
| 109 | { |
| 110 | if (_isLittleEndian()) value = _swap64(value); |
| 111 | __builtin_memcpy(memPtr, &value, sizeof(value)); |
| 112 | } |
| 113 | |
| 114 | /* generic */ |
| 115 | extern void __bad_unaligned_access_size(void); |
| 116 | |
| 117 | #define __get_unaligned_le(ptr) ((typeof(*(ptr)))({ \ |
| 118 | __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \ |
| 119 | __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)), \ |
| 120 | __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)), \ |
| 121 | __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)), \ |
| 122 | __bad_unaligned_access_size())))); \ |
| 123 | })) |
| 124 | |
| 125 | #define __get_unaligned_be(ptr) ((typeof(*(ptr)))({ \ |
| 126 | __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \ |
| 127 | __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)), \ |
| 128 | __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)), \ |
| 129 | __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)), \ |
| 130 | __bad_unaligned_access_size())))); \ |
| 131 | })) |
| 132 | |
| 133 | #define __put_unaligned_le(val, ptr) \ |
| 134 | ({ \ |
| 135 | void *__gu_p = (ptr); \ |
| 136 | switch (sizeof(*(ptr))) { \ |
| 137 | case 1: \ |
| 138 | *(uint8_t *)__gu_p = (uint8_t)(val); \ |
| 139 | break; \ |
| 140 | case 2: \ |
| 141 | put_unaligned_le16((uint16_t)(val), __gu_p); \ |
| 142 | break; \ |
| 143 | case 4: \ |
| 144 | put_unaligned_le32((uint32_t)(val), __gu_p); \ |
| 145 | break; \ |
| 146 | case 8: \ |
| 147 | put_unaligned_le64((uint64_t)(val), __gu_p); \ |
| 148 | break; \ |
| 149 | default: \ |
| 150 | __bad_unaligned_access_size(); \ |
| 151 | break; \ |
| 152 | } \ |
| 153 | (void)0; \ |
| 154 | }) |
| 155 | |
| 156 | #define __put_unaligned_be(val, ptr) \ |
| 157 | ({ \ |
| 158 | void *__gu_p = (ptr); \ |
| 159 | switch (sizeof(*(ptr))) { \ |
| 160 | case 1: \ |
| 161 | *(uint8_t *)__gu_p = (uint8_t)(val); \ |
| 162 | break; \ |
| 163 | case 2: \ |
| 164 | put_unaligned_be16((uint16_t)(val), __gu_p); \ |
| 165 | break; \ |
| 166 | case 4: \ |
| 167 | put_unaligned_be32((uint32_t)(val), __gu_p); \ |
| 168 | break; \ |
| 169 | case 8: \ |
| 170 | put_unaligned_be64((uint64_t)(val), __gu_p); \ |
| 171 | break; \ |
| 172 | default: \ |
| 173 | __bad_unaligned_access_size(); \ |
| 174 | break; \ |
| 175 | } \ |
| 176 | (void)0; \ |
| 177 | }) |
| 178 | |
| 179 | #if _IS_LITTLE_ENDIAN |
| 180 | # define get_unaligned __get_unaligned_le |
| 181 | # define put_unaligned __put_unaligned_le |
| 182 | #else |
| 183 | # define get_unaligned __get_unaligned_be |
| 184 | # define put_unaligned __put_unaligned_be |
| 185 | #endif |
| 186 | |
| 187 | #endif // ASM_UNALIGNED_H |
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