1 /* ===-- endianness.h - configuration header for libgcc replacement --------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is dual licensed under the MIT and the University of Illinois Open 6 * Source Licenses. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file is a configuration header for libgcc replacement. 11 * This file is not part of the interface of this library. 12 * 13 * ===----------------------------------------------------------------------=== 14 */ 15 16 #ifndef ENDIANNESS_H 17 #define ENDIANNESS_H 18 19 /* 20 * Known limitations: 21 * Middle endian systems are not handled currently. 22 */ 23 24 #if defined(__SVR4) && defined(__sun) 25 #include <sys/byteorder.h> 26 27 #if _BYTE_ORDER == _BIG_ENDIAN 28 #define _YUGA_LITTLE_ENDIAN 0 29 #define _YUGA_BIG_ENDIAN 1 30 #elif _BYTE_ORDER == _LITTLE_ENDIAN 31 #define _YUGA_LITTLE_ENDIAN 1 32 #define _YUGA_BIG_ENDIAN 0 33 #endif /* _BYTE_ORDER */ 34 35 #endif /* Solaris and AuroraUX. */ 36 37 /* .. */ 38 39 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonflyBSD__) || defined(__minix) 40 #include <sys/endian.h> 41 42 #if _BYTE_ORDER == _BIG_ENDIAN 43 #define _YUGA_LITTLE_ENDIAN 0 44 #define _YUGA_BIG_ENDIAN 1 45 #elif _BYTE_ORDER == _LITTLE_ENDIAN 46 #define _YUGA_LITTLE_ENDIAN 1 47 #define _YUGA_BIG_ENDIAN 0 48 #endif /* _BYTE_ORDER */ 49 50 #endif /* *BSD */ 51 52 /* .. */ 53 54 #if defined(__OpenBSD__) || defined(__Bitrig__) 55 #include <machine/endian.h> 56 57 #if _BYTE_ORDER == _BIG_ENDIAN 58 #define _YUGA_LITTLE_ENDIAN 0 59 #define _YUGA_BIG_ENDIAN 1 60 #elif _BYTE_ORDER == _LITTLE_ENDIAN 61 #define _YUGA_LITTLE_ENDIAN 1 62 #define _YUGA_BIG_ENDIAN 0 63 #endif /* _BYTE_ORDER */ 64 65 #endif /* OpenBSD and Bitrig. */ 66 67 /* .. */ 68 69 /* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the compiler (at least with GCC) */ 70 #if defined(__APPLE__) && defined(__MACH__) || defined(__ellcc__ ) 71 72 #ifdef __BIG_ENDIAN__ 73 #if __BIG_ENDIAN__ 74 #define _YUGA_LITTLE_ENDIAN 0 75 #define _YUGA_BIG_ENDIAN 1 76 #endif 77 #endif /* __BIG_ENDIAN__ */ 78 79 #ifdef __LITTLE_ENDIAN__ 80 #if __LITTLE_ENDIAN__ 81 #define _YUGA_LITTLE_ENDIAN 1 82 #define _YUGA_BIG_ENDIAN 0 83 #endif 84 #endif /* __LITTLE_ENDIAN__ */ 85 86 #endif /* Mac OSX */ 87 88 /* .. */ 89 90 #if defined(__linux__) 91 #include <endian.h> 92 93 #if __BYTE_ORDER == __BIG_ENDIAN 94 #define _YUGA_LITTLE_ENDIAN 0 95 #define _YUGA_BIG_ENDIAN 1 96 #elif __BYTE_ORDER == __LITTLE_ENDIAN 97 #define _YUGA_LITTLE_ENDIAN 1 98 #define _YUGA_BIG_ENDIAN 0 99 #endif /* __BYTE_ORDER */ 100 101 #endif /* GNU/Linux */ 102 103 /* . */ 104 105 #if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN) 106 #error Unable to determine endian 107 #endif /* Check we found an endianness correctly. */ 108 109 #endif /* ENDIANNESS_H */ 110
