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__) 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 /* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the compiler (at least with GCC) */ 55 #if defined(__APPLE__) && defined(__MACH__) || defined(__ellcc__ ) 56 57 #ifdef __BIG_ENDIAN__ 58 #if __BIG_ENDIAN__ 59 #define _YUGA_LITTLE_ENDIAN 0 60 #define _YUGA_BIG_ENDIAN 1 61 #endif 62 #endif /* __BIG_ENDIAN__ */ 63 64 #ifdef __LITTLE_ENDIAN__ 65 #if __LITTLE_ENDIAN__ 66 #define _YUGA_LITTLE_ENDIAN 1 67 #define _YUGA_BIG_ENDIAN 0 68 #endif 69 #endif /* __LITTLE_ENDIAN__ */ 70 71 #endif /* Mac OSX */ 72 73 /* .. */ 74 75 #if defined(__linux__) 76 #include <endian.h> 77 78 #if __BYTE_ORDER == __BIG_ENDIAN 79 #define _YUGA_LITTLE_ENDIAN 0 80 #define _YUGA_BIG_ENDIAN 1 81 #elif __BYTE_ORDER == __LITTLE_ENDIAN 82 #define _YUGA_LITTLE_ENDIAN 1 83 #define _YUGA_BIG_ENDIAN 0 84 #endif /* __BYTE_ORDER */ 85 86 #endif /* GNU/Linux */ 87 88 /* . */ 89 90 #if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN) 91 #error Unable to determine endian 92 #endif /* Check we found an endianness correctly. */ 93 94 #endif /* ENDIANNESS_H */ 95