byteswap.hh (3980:9bcb2a2e9bb8) byteswap.hh (4176:2d52a9751dfc)
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;

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32
33//The purpose of this file is to provide endainness conversion utility
34//functions. Depending on the endianness of the guest system, either
35//the LittleEndianGuest or BigEndianGuest namespace is used.
36
37#ifndef __SIM_BYTE_SWAP_HH__
38#define __SIM_BYTE_SWAP_HH__
39
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;

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32
33//The purpose of this file is to provide endainness conversion utility
34//functions. Depending on the endianness of the guest system, either
35//the LittleEndianGuest or BigEndianGuest namespace is used.
36
37#ifndef __SIM_BYTE_SWAP_HH__
38#define __SIM_BYTE_SWAP_HH__
39
40#include "base/bigint.hh"
40#include "base/misc.hh"
41#include "sim/host.hh"
42
43// This lets us figure out what the byte order of the host system is
44#if defined(linux)
45#include <endian.h>
46// If this is a linux system, lets used the optimized definitions if they exist.
47// If one doesn't exist, we pretty much get what is listed below, so it all

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104#else
105 return (uint16_t)(((uint16_t)(x) & 0xff) << 8 |
106 ((uint16_t)(x) & 0xff00) >> 8);
107#endif
108}
109
110// This function lets the compiler figure out how to call the
111// swap_byte functions above for different data types. Since the
41#include "base/misc.hh"
42#include "sim/host.hh"
43
44// This lets us figure out what the byte order of the host system is
45#if defined(linux)
46#include <endian.h>
47// If this is a linux system, lets used the optimized definitions if they exist.
48// If one doesn't exist, we pretty much get what is listed below, so it all

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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
112// sizeof() values are known at compiel time, it should inline to a
113// sizeof() values are known at compile time, it should inline to a
113// direct call to the right swap_byteNN() function.
114template <typename T>
115static inline T swap_byte(T x) {
116 if (sizeof(T) == 8)
117 return swap_byte64((uint64_t)x);
118 else if (sizeof(T) == 4)
119 return swap_byte32((uint32_t)x);
120 else if (sizeof(T) == 2)
121 return swap_byte16((uint16_t)x);
122 else if (sizeof(T) == 1)
123 return x;
124 else
125 panic("Can't byte-swap values larger than 64 bits");
126}
127
114// direct call to the right swap_byteNN() function.
115template <typename T>
116static inline 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<>
130static inline Twin64_t swap_byte<Twin64_t>(Twin64_t x)
131{
132 x.a = swap_byte(x.a);
133 x.b = swap_byte(x.b);
134 return x;
135}
136
137template<>
138static inline Twin32_t swap_byte<Twin32_t>(Twin32_t x)
139{
140 x.a = swap_byte(x.a);
141 x.b = swap_byte(x.b);
142 return x;
143}
144
128//The conversion functions with fixed endianness on both ends don't need to
129//be in a namespace
130template <typename T> static inline T betole(T value) {return swap_byte(value);}
131template <typename T> static inline T letobe(T value) {return swap_byte(value);}
132
133//For conversions not involving the guest system, we can define the functions
134//conditionally based on the BYTE_ORDER macro and outside of the namespaces
135#if defined(_BIG_ENDIAN) || !defined(_LITTLE_ENDIAN) && BYTE_ORDER == BIG_ENDIAN

--- 49 unchanged lines hidden --- 		145//The conversion functions with fixed endianness on both ends don't need to
146//be in a namespace
147template <typename T> static inline T betole(T value) {return swap_byte(value);}
148template <typename T> static inline T letobe(T value) {return swap_byte(value);}
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

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