mirror of
https://github.com/DrBeef/Raze.git
synced 2024-12-16 15:40:58 +00:00
718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
184 lines
6.1 KiB
C
184 lines
6.1 KiB
C
// CPU Byte Order Utilities
|
|
|
|
#ifndef BLARGG_ENDIAN
|
|
#define BLARGG_ENDIAN
|
|
|
|
#include "blargg_common.h"
|
|
|
|
// BLARGG_CPU_CISC: Defined if CPU has very few general-purpose registers (< 16)
|
|
#if defined (__i386__) || defined (__x86_64__) || defined (_M_IX86) || defined (_M_X64)
|
|
#define BLARGG_CPU_X86 1
|
|
#define BLARGG_CPU_CISC 1
|
|
#endif
|
|
|
|
#if defined (__powerpc__) || defined (__ppc__) || defined (__ppc64__) || \
|
|
defined (__POWERPC__) || defined (__powerc)
|
|
#define BLARGG_CPU_POWERPC 1
|
|
#define BLARGG_CPU_RISC 1
|
|
#endif
|
|
|
|
// BLARGG_BIG_ENDIAN, BLARGG_LITTLE_ENDIAN: Determined automatically, otherwise only
|
|
// one may be #defined to 1. Only needed if something actually depends on byte order.
|
|
#if !defined (BLARGG_BIG_ENDIAN) && !defined (BLARGG_LITTLE_ENDIAN)
|
|
#ifdef __GLIBC__
|
|
// GCC handles this for us
|
|
#include <endian.h>
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
#define BLARGG_LITTLE_ENDIAN 1
|
|
#elif __BYTE_ORDER == __BIG_ENDIAN
|
|
#define BLARGG_BIG_ENDIAN 1
|
|
#endif
|
|
#else
|
|
|
|
#if defined (LSB_FIRST) || defined (__LITTLE_ENDIAN__) || BLARGG_CPU_X86 || \
|
|
(defined (LITTLE_ENDIAN) && LITTLE_ENDIAN+0 != 1234)
|
|
#define BLARGG_LITTLE_ENDIAN 1
|
|
#endif
|
|
|
|
#if defined (MSB_FIRST) || defined (__BIG_ENDIAN__) || defined (WORDS_BIGENDIAN) || \
|
|
defined (__sparc__) || BLARGG_CPU_POWERPC || \
|
|
(defined (BIG_ENDIAN) && BIG_ENDIAN+0 != 4321)
|
|
#define BLARGG_BIG_ENDIAN 1
|
|
#elif !defined (__mips__)
|
|
// No endian specified; assume little-endian, since it's most common
|
|
#define BLARGG_LITTLE_ENDIAN 1
|
|
#endif
|
|
#endif
|
|
#endif
|
|
|
|
#if BLARGG_LITTLE_ENDIAN && BLARGG_BIG_ENDIAN
|
|
#undef BLARGG_LITTLE_ENDIAN
|
|
#undef BLARGG_BIG_ENDIAN
|
|
#endif
|
|
|
|
inline void blargg_verify_byte_order()
|
|
{
|
|
#ifndef NDEBUG
|
|
#if BLARGG_BIG_ENDIAN
|
|
volatile int i = 1;
|
|
assert( *(volatile char*) &i == 0 );
|
|
#elif BLARGG_LITTLE_ENDIAN
|
|
volatile int i = 1;
|
|
assert( *(volatile char*) &i != 0 );
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
inline unsigned get_le16( void const* p )
|
|
{
|
|
return (unsigned) ((unsigned char const*) p) [1] << 8 |
|
|
(unsigned) ((unsigned char const*) p) [0];
|
|
}
|
|
|
|
inline unsigned get_be16( void const* p )
|
|
{
|
|
return (unsigned) ((unsigned char const*) p) [0] << 8 |
|
|
(unsigned) ((unsigned char const*) p) [1];
|
|
}
|
|
|
|
inline blargg_ulong get_le32( void const* p )
|
|
{
|
|
return (blargg_ulong) ((unsigned char const*) p) [3] << 24 |
|
|
(blargg_ulong) ((unsigned char const*) p) [2] << 16 |
|
|
(blargg_ulong) ((unsigned char const*) p) [1] << 8 |
|
|
(blargg_ulong) ((unsigned char const*) p) [0];
|
|
}
|
|
|
|
inline blargg_ulong get_be32( void const* p )
|
|
{
|
|
return (blargg_ulong) ((unsigned char const*) p) [0] << 24 |
|
|
(blargg_ulong) ((unsigned char const*) p) [1] << 16 |
|
|
(blargg_ulong) ((unsigned char const*) p) [2] << 8 |
|
|
(blargg_ulong) ((unsigned char const*) p) [3];
|
|
}
|
|
|
|
inline void set_le16( void* p, unsigned n )
|
|
{
|
|
((unsigned char*) p) [1] = (unsigned char) (n >> 8);
|
|
((unsigned char*) p) [0] = (unsigned char) n;
|
|
}
|
|
|
|
inline void set_be16( void* p, unsigned n )
|
|
{
|
|
((unsigned char*) p) [0] = (unsigned char) (n >> 8);
|
|
((unsigned char*) p) [1] = (unsigned char) n;
|
|
}
|
|
|
|
inline void set_le32( void* p, blargg_ulong n )
|
|
{
|
|
((unsigned char*) p) [0] = (unsigned char) n;
|
|
((unsigned char*) p) [1] = (unsigned char) (n >> 8);
|
|
((unsigned char*) p) [2] = (unsigned char) (n >> 16);
|
|
((unsigned char*) p) [3] = (unsigned char) (n >> 24);
|
|
}
|
|
|
|
inline void set_be32( void* p, blargg_ulong n )
|
|
{
|
|
((unsigned char*) p) [3] = (unsigned char) n;
|
|
((unsigned char*) p) [2] = (unsigned char) (n >> 8);
|
|
((unsigned char*) p) [1] = (unsigned char) (n >> 16);
|
|
((unsigned char*) p) [0] = (unsigned char) (n >> 24);
|
|
}
|
|
|
|
#if BLARGG_NONPORTABLE
|
|
// Optimized implementation if byte order is known
|
|
#if BLARGG_LITTLE_ENDIAN
|
|
#define GET_LE16( addr ) (*(uint16_t*) (addr))
|
|
#define GET_LE32( addr ) (*(uint32_t*) (addr))
|
|
#define SET_LE16( addr, data ) (void) (*(uint16_t*) (addr) = (data))
|
|
#define SET_LE32( addr, data ) (void) (*(uint32_t*) (addr) = (data))
|
|
#elif BLARGG_BIG_ENDIAN
|
|
#define GET_BE16( addr ) (*(uint16_t*) (addr))
|
|
#define GET_BE32( addr ) (*(uint32_t*) (addr))
|
|
#define SET_BE16( addr, data ) (void) (*(uint16_t*) (addr) = (data))
|
|
#define SET_BE32( addr, data ) (void) (*(uint32_t*) (addr) = (data))
|
|
|
|
#if BLARGG_CPU_POWERPC
|
|
// PowerPC has special byte-reversed instructions
|
|
#if defined (__MWERKS__)
|
|
#define GET_LE16( addr ) (__lhbrx( addr, 0 ))
|
|
#define GET_LE32( addr ) (__lwbrx( addr, 0 ))
|
|
#define SET_LE16( addr, in ) (__sthbrx( in, addr, 0 ))
|
|
#define SET_LE32( addr, in ) (__stwbrx( in, addr, 0 ))
|
|
#elif defined (__GNUC__)
|
|
#define GET_LE16( addr ) ({unsigned short ppc_lhbrx_; __asm__ volatile( "lhbrx %0,0,%1" : "=r" (ppc_lhbrx_) : "r" (addr) : "memory" ); ppc_lhbrx_;})
|
|
#define GET_LE32( addr ) ({unsigned short ppc_lwbrx_; __asm__ volatile( "lwbrx %0,0,%1" : "=r" (ppc_lwbrx_) : "r" (addr) : "memory" ); ppc_lwbrx_;})
|
|
#define SET_LE16( addr, in ) ({__asm__ volatile( "sthbrx %0,0,%1" : : "r" (in), "r" (addr) : "memory" );})
|
|
#define SET_LE32( addr, in ) ({__asm__ volatile( "stwbrx %0,0,%1" : : "r" (in), "r" (addr) : "memory" );})
|
|
#endif
|
|
#endif
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef GET_LE16
|
|
#define GET_LE16( addr ) get_le16( addr )
|
|
#define SET_LE16( addr, data ) set_le16( addr, data )
|
|
#endif
|
|
|
|
#ifndef GET_LE32
|
|
#define GET_LE32( addr ) get_le32( addr )
|
|
#define SET_LE32( addr, data ) set_le32( addr, data )
|
|
#endif
|
|
|
|
#ifndef GET_BE16
|
|
#define GET_BE16( addr ) get_be16( addr )
|
|
#define SET_BE16( addr, data ) set_be16( addr, data )
|
|
#endif
|
|
|
|
#ifndef GET_BE32
|
|
#define GET_BE32( addr ) get_be32( addr )
|
|
#define SET_BE32( addr, data ) set_be32( addr, data )
|
|
#endif
|
|
|
|
// auto-selecting versions
|
|
|
|
inline void set_le( uint16_t* p, unsigned n ) { SET_LE16( p, n ); }
|
|
inline void set_le( uint32_t* p, blargg_ulong n ) { SET_LE32( p, n ); }
|
|
inline void set_be( uint16_t* p, unsigned n ) { SET_BE16( p, n ); }
|
|
inline void set_be( uint32_t* p, blargg_ulong n ) { SET_BE32( p, n ); }
|
|
inline unsigned get_le( uint16_t* p ) { return GET_LE16( p ); }
|
|
inline blargg_ulong get_le( uint32_t* p ) { return GET_LE32( p ); }
|
|
inline unsigned get_be( uint16_t* p ) { return GET_BE16( p ); }
|
|
inline blargg_ulong get_be( uint32_t* p ) { return GET_BE32( p ); }
|
|
|
|
#endif
|