/* * Copyright (c) 2004 The Regents of The University of Michigan * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer; * redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution; * neither the name of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Authors: Gabe Black */ //The purpose of this file is to provide endainness conversion utility //functions. Depending on the endianness of the guest system, either //the LittleEndianGuest or BigEndianGuest namespace is used. #ifndef __SIM_BYTE_SWAP_HH__ #define __SIM_BYTE_SWAP_HH__ #include "sim/host.hh" // This lets us figure out what the byte order of the host system is #if defined(linux) #include // If this is a linux system, lets used the optimized definitions if they exist. // If one doesn't exist, we pretty much get what is listed below, so it all // works out #include #else #include #endif //These functions actually perform the swapping for parameters //of various bit lengths static inline uint64_t swap_byte64(uint64_t x) { #if defined(linux) return bswap_64(x); #else return (uint64_t)((((uint64_t)(x) & 0xff) << 56) | ((uint64_t)(x) & 0xff00ULL) << 40 | ((uint64_t)(x) & 0xff0000ULL) << 24 | ((uint64_t)(x) & 0xff000000ULL) << 8 | ((uint64_t)(x) & 0xff00000000ULL) >> 8 | ((uint64_t)(x) & 0xff0000000000ULL) >> 24 | ((uint64_t)(x) & 0xff000000000000ULL) >> 40 | ((uint64_t)(x) & 0xff00000000000000ULL) >> 56) ; #endif } static inline uint32_t swap_byte32(uint32_t x) { #if defined(linux) return bswap_32(x); #else return (uint32_t)(((uint32_t)(x) & 0xff) << 24 | ((uint32_t)(x) & 0xff00) << 8 | ((uint32_t)(x) & 0xff0000) >> 8 | ((uint32_t)(x) & 0xff000000) >> 24); #endif } static inline uint16_t swap_byte16(uint16_t x) { #if defined(linux) return bswap_16(x); #else return (uint16_t)(((uint16_t)(x) & 0xff) << 8 | ((uint16_t)(x) & 0xff00) >> 8); #endif } //This lets the compiler figure out how to call the swap_byte functions above //for different data types. static inline uint64_t swap_byte(uint64_t x) {return swap_byte64(x);} static inline int64_t swap_byte(int64_t x) {return swap_byte64((uint64_t)x);} static inline uint32_t swap_byte(uint32_t x) {return swap_byte32(x);} static inline int32_t swap_byte(int32_t x) {return swap_byte32((uint32_t)x);} //This is to prevent the following two functions from compiling on //64bit machines. It won't detect everything, so it should be changed. #ifndef __x86_64__ static inline long swap_byte(long x) {return swap_byte32((long)x);} static inline unsigned long swap_byte(unsigned long x) { return swap_byte32((unsigned long)x);} #endif static inline uint16_t swap_byte(uint16_t x) {return swap_byte32(x);} static inline int16_t swap_byte(int16_t x) {return swap_byte16((uint16_t)x);} static inline uint8_t swap_byte(uint8_t x) {return x;} static inline int8_t swap_byte(int8_t x) {return x;} static inline double swap_byte(double x) {return swap_byte64((uint64_t)x);} static inline float swap_byte(float x) {return swap_byte32((uint32_t)x);} //The conversion functions with fixed endianness on both ends don't need to //be in a namespace template static inline T betole(T value) {return swap_byte(value);} template static inline T letobe(T value) {return swap_byte(value);} //For conversions not involving the guest system, we can define the functions //conditionally based on the BYTE_ORDER macro and outside of the namespaces #if BYTE_ORDER == BIG_ENDIAN template static inline T htole(T value) {return swap_byte(value);} template static inline T letoh(T value) {return swap_byte(value);} template static inline T htobe(T value) {return value;} template static inline T betoh(T value) {return value;} #elif BYTE_ORDER == LITTLE_ENDIAN template static inline T htole(T value) {return value;} template static inline T letoh(T value) {return value;} template static inline T htobe(T value) {return swap_byte(value);} template static inline T betoh(T value) {return swap_byte(value);} #else #error Invalid Endianess #endif namespace BigEndianGuest { template static inline T gtole(T value) {return betole(value);} template static inline T letog(T value) {return letobe(value);} template static inline T gtobe(T value) {return value;} template static inline T betog(T value) {return value;} template static inline T htog(T value) {return htobe(value);} template static inline T gtoh(T value) {return betoh(value);} } namespace LittleEndianGuest { template static inline T gtole(T value) {return value;} template static inline T letog(T value) {return value;} template static inline T gtobe(T value) {return letobe(value);} template static inline T betog(T value) {return betole(value);} template static inline T htog(T value) {return htole(value);} template static inline T gtoh(T value) {return letoh(value);} } #endif // __SIM_BYTE_SWAP_HH__