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Add in constants which let you explicitly check if endian conversion would do anything. This was needed for a case where a piece of data was within a larger data type. When the larger data type was swapped, the location of the smaller data type would move.

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--HG--
extra : convert_revision : 4c904c964678529c72b8f1044dfcb400604f6654
This commit is contained in:
Gabe Black 2006-12-16 07:37:33 -05:00
parent c6944e320c
commit 569e0e883b
1 changed files with 30 additions and 24 deletions
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54
src/sim/byteswap.hh
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@ -57,6 +57,8 @@
#include <libkern/OSByteOrder.h>
#endif
enum ByteOrder {BigEndianByteOrder, LittleEndianByteOrder};
//These functions actually perform the swapping for parameters
//of various bit lengths
static inline uint64_t
@ -131,11 +133,13 @@ template <typename T> 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 defined(_BIG_ENDIAN) || BYTE_ORDER == BIG_ENDIAN
const ByteOrder HostByteOrder = BigEndianByteOrder;
template <typename T> static inline T htole(T value) {return swap_byte(value);}
template <typename T> static inline T letoh(T value) {return swap_byte(value);}
template <typename T> static inline T htobe(T value) {return value;}
template <typename T> static inline T betoh(T value) {return value;}
#elif defined(_LITTLE_ENDIAN) || BYTE_ORDER == LITTLE_ENDIAN
const ByteOrder HostByteOrder = LittleEndianByteOrder;
template <typename T> static inline T htole(T value) {return value;}
template <typename T> static inline T letoh(T value) {return value;}
template <typename T> static inline T htobe(T value) {return swap_byte(value);}
@ -146,33 +150,35 @@ template <typename T> static inline T betoh(T value) {return swap_byte(value);}
namespace BigEndianGuest
{
template <typename T>
static inline T gtole(T value) {return betole(value);}
template <typename T>
static inline T letog(T value) {return letobe(value);}
template <typename T>
static inline T gtobe(T value) {return value;}
template <typename T>
static inline T betog(T value) {return value;}
template <typename T>
static inline T htog(T value) {return htobe(value);}
template <typename T>
static inline T gtoh(T value) {return betoh(value);}
const bool ByteOrderDiffers = (HostByteOrder != BigEndianByteOrder);
template <typename T>
static inline T gtole(T value) {return betole(value);}
template <typename T>
static inline T letog(T value) {return letobe(value);}
template <typename T>
static inline T gtobe(T value) {return value;}
template <typename T>
static inline T betog(T value) {return value;}
template <typename T>
static inline T htog(T value) {return htobe(value);}
template <typename T>
static inline T gtoh(T value) {return betoh(value);}
}
namespace LittleEndianGuest
{
template <typename T>
static inline T gtole(T value) {return value;}
template <typename T>
static inline T letog(T value) {return value;}
template <typename T>
static inline T gtobe(T value) {return letobe(value);}
template <typename T>
static inline T betog(T value) {return betole(value);}
template <typename T>
static inline T htog(T value) {return htole(value);}
template <typename T>
static inline T gtoh(T value) {return letoh(value);}
const bool ByteOrderDiffers = (HostByteOrder != LittleEndianByteOrder);
template <typename T>
static inline T gtole(T value) {return value;}
template <typename T>
static inline T letog(T value) {return value;}
template <typename T>
static inline T gtobe(T value) {return letobe(value);}
template <typename T>
static inline T betog(T value) {return betole(value);}
template <typename T>
static inline T htog(T value) {return htole(value);}
template <typename T>
static inline T gtoh(T value) {return letoh(value);}
}
#endif // __SIM_BYTE_SWAP_HH__