1/* 2 * Copyright (c) 2004 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; --- 48 unchanged lines hidden (view full) --- 57#if defined(__APPLE__) 58#include <libkern/OSByteOrder.h> 59#endif 60 61enum ByteOrder {BigEndianByteOrder, LittleEndianByteOrder}; 62 63//These functions actually perform the swapping for parameters 64//of various bit lengths |
65inline uint64_t |
66swap_byte64(uint64_t x) 67{ 68#if defined(linux) 69 return bswap_64(x); 70#elif defined(__APPLE__) 71 return OSSwapInt64(x); 72#else 73 return (uint64_t)((((uint64_t)(x) & 0xff) << 56) | 74 ((uint64_t)(x) & 0xff00ULL) << 40 | 75 ((uint64_t)(x) & 0xff0000ULL) << 24 | 76 ((uint64_t)(x) & 0xff000000ULL) << 8 | 77 ((uint64_t)(x) & 0xff00000000ULL) >> 8 | 78 ((uint64_t)(x) & 0xff0000000000ULL) >> 24 | 79 ((uint64_t)(x) & 0xff000000000000ULL) >> 40 | 80 ((uint64_t)(x) & 0xff00000000000000ULL) >> 56) ; 81#endif 82} 83 |
84inline uint32_t |
85swap_byte32(uint32_t x) 86{ 87#if defined(linux) 88 return bswap_32(x); 89#elif defined(__APPLE__) 90 return OSSwapInt32(x); 91#else 92 return (uint32_t)(((uint32_t)(x) & 0xff) << 24 | 93 ((uint32_t)(x) & 0xff00) << 8 | ((uint32_t)(x) & 0xff0000) >> 8 | 94 ((uint32_t)(x) & 0xff000000) >> 24); 95#endif 96} 97 |
98inline uint16_t |
99swap_byte16(uint16_t x) 100{ 101#if defined(linux) 102 return bswap_16(x); 103#elif defined(__APPLE__) 104 return OSSwapInt16(x); 105#else 106 return (uint16_t)(((uint16_t)(x) & 0xff) << 8 | 107 ((uint16_t)(x) & 0xff00) >> 8); 108#endif 109} 110 111// This function lets the compiler figure out how to call the 112// swap_byte functions above for different data types. Since the 113// sizeof() values are known at compile time, it should inline to a 114// direct call to the right swap_byteNN() function. 115template <typename T> |
116inline T swap_byte(T x) { |
117 if (sizeof(T) == 8) 118 return swap_byte64((uint64_t)x); 119 else if (sizeof(T) == 4) 120 return swap_byte32((uint32_t)x); 121 else if (sizeof(T) == 2) 122 return swap_byte16((uint16_t)x); 123 else if (sizeof(T) == 1) 124 return x; 125 else 126 panic("Can't byte-swap values larger than 64 bits"); 127} 128 129template<> |
130inline Twin64_t swap_byte |
131{ 132 x.a = swap_byte(x.a); 133 x.b = swap_byte(x.b); 134 return x; 135} 136 137template<> |
138inline Twin32_t swap_byte |
139{ 140 x.a = swap_byte(x.a); 141 x.b = swap_byte(x.b); 142 return x; 143} 144 145//The conversion functions with fixed endianness on both ends don't need to 146//be in a namespace |
147template 148template |
149 150//For conversions not involving the guest system, we can define the functions 151//conditionally based on the BYTE_ORDER macro and outside of the namespaces 152#if defined(_BIG_ENDIAN) || !defined(_LITTLE_ENDIAN) && BYTE_ORDER == BIG_ENDIAN 153const ByteOrder HostByteOrder = BigEndianByteOrder; |
154template 155template 156template 157template |
158#elif defined(_LITTLE_ENDIAN) || BYTE_ORDER == LITTLE_ENDIAN 159const ByteOrder HostByteOrder = LittleEndianByteOrder; |
160template 161template 162template 163template |
164#else 165 #error Invalid Endianess 166#endif 167 168namespace BigEndianGuest 169{ 170 const bool ByteOrderDiffers = (HostByteOrder != BigEndianByteOrder); 171 template <typename T> |
172 inline T gtole(T value) {return betole(value);} |
173 template <typename T> |
174 inline T letog(T value) {return letobe(value);} |
175 template <typename T> |
176 inline T gtobe(T value) {return value;} |
177 template <typename T> |
178 inline T betog(T value) {return value;} |
179 template <typename T> |
180 inline T htog(T value) {return htobe(value);} |
181 template <typename T> |
182 inline T gtoh(T value) {return betoh(value);} |
183} 184 185namespace LittleEndianGuest 186{ 187 const bool ByteOrderDiffers = (HostByteOrder != LittleEndianByteOrder); 188 template <typename T> |
189 inline T gtole(T value) {return value;} |
190 template <typename T> |
191 inline T letog(T value) {return value;} |
192 template <typename T> |
193 inline T gtobe(T value) {return letobe(value);} |
194 template <typename T> |
195 inline T betog(T value) {return betole(value);} |
196 template <typename T> |
197 inline T htog(T value) {return htole(value);} |
198 template <typename T> |
199 inline T gtoh(T value) {return letoh(value);} |
200} 201#endif // __SIM_BYTE_SWAP_HH__ |