dingusppc/memaccess.h
2021-02-03 12:19:18 +01:00

103 lines
5.0 KiB
C

/** @file Set of macros for accessing host memory units of various sizes
and endianness.
*/
#ifndef MEM_ACCESS_H
#define MEM_ACCESS_H
#include "endianswap.h"
#include <cinttypes>
/* read an aligned big-endian WORD (16bit) */
#define READ_WORD_BE_A(addr) (BYTESWAP_16(*((uint16_t*)((addr)))))
/* read an aligned big-endian DWORD (32bit) */
#define READ_DWORD_BE_A(addr) (BYTESWAP_32(*((uint32_t*)((addr)))))
/* read an aligned big-endian QWORD (64bit) */
#define READ_QWORD_BE_A(addr) (BYTESWAP_64(*((uint64_t*)((addr)))))
/* read an aligned little-endian WORD (16bit) */
#define READ_WORD_LE_A(addr) (*(uint16_t*)((addr)))
/* read an aligned little-endian DWORD (32bit) */
#define READ_DWORD_LE_A(addr) (*(uint32_t*)((addr)))
/* read an aligned little-endian QWORD (64bit) */
#define READ_QWORD_LE_A(addr) (*(uint64_t*)((addr)))
/* read an unaligned big-endian WORD (16bit) */
#define READ_WORD_BE_U(addr) (((addr)[0] << 8) | (addr)[1])
/* read an unaligned big-endian DWORD (32bit) */
#define READ_DWORD_BE_U(addr) (((addr)[0] << 24) | ((addr)[1] << 16) | ((addr)[2] << 8) | (addr)[3])
/* read an unaligned big-endian QWORD (32bit) */
#define READ_QWORD_BE_U(addr) \
(((addr)[0] << 56) | ((addr)[1] << 48) | ((addr)[2] << 40) | ((addr)[3] << 32) | \
((addr)[4] << 24) | ((addr)[5] << 16) | ((addr)[6] << 8) | (addr)[7])
/* read an unaligned little-endian WORD (16bit) */
#define READ_WORD_LE_U(addr) (((addr)[1] << 8) | (addr)[0])
/* read an unaligned little-endian DWORD (32bit) */
#define READ_DWORD_LE_U(addr) (((addr)[3] << 24) | ((addr)[2] << 16) | ((addr)[1] << 8) | (addr)[0])
/* read an unaligned little-endian DWORD (32bit) */
#define READ_QWORD_LE_U(addr) \
(((addr)[7] << 56) | ((addr)[6] << 48) | ((addr)[5] << 40) | ((addr)[4] << 32) | \
((addr)[3] << 24) | ((addr)[2] << 16) | ((addr)[1] << 8) | (addr)[0])
/* write an aligned big-endian WORD (16bit) */
#define WRITE_WORD_BE_A(addr, val) (*((uint16_t*)((addr))) = BYTESWAP_16(val))
/* write an aligned big-endian DWORD (32bit) */
#define WRITE_DWORD_BE_A(addr, val) (*((uint32_t*)((addr))) = BYTESWAP_32(val))
/* write an aligned big-endian QWORD (64bit) */
#define WRITE_QWORD_BE_A(addr, val) (*((uint64_t*)((addr))) = BYTESWAP_64(val))
/* write an unaligned big-endian WORD (16bit) */
#define WRITE_WORD_BE_U(addr, val) \
do { \
(addr)[0] = ((val) >> 8) & 0xFF; \
(addr)[1] = (val)&0xFF; \
} while (0)
/* write an unaligned big-endian DWORD (32bit) */
#define WRITE_DWORD_BE_U(addr, val) \
do { \
(addr)[0] = ((val) >> 24) & 0xFF; \
(addr)[1] = ((val) >> 16) & 0xFF; \
(addr)[2] = ((val) >> 8) & 0xFF; \
(addr)[3] = (val)&0xFF; \
} while (0)
/* write an aligned little-endian WORD (16bit) */
#define WRITE_WORD_LE_A(addr, val) (*((uint16_t*)((addr))) = (val))
/* write an aligned little-endian DWORD (32bit) */
#define WRITE_DWORD_LE_A(addr, val) (*((uint32_t*)((addr))) = (val))
/* write an aligned little-endian QWORD (64bit) */
#define WRITE_QWORD_LE_A(addr, val) (*((uint64_t*)((addr))) = (val))
/* write an unaligned little-endian WORD (16bit) */
#define WRITE_WORD_LE_U(addr, val) \
do { \
(addr)[0] = (val)&0xFF; \
(addr)[1] = ((val) >> 8) & 0xFF; \
} while (0)
/* write an unaligned little-endian DWORD (32bit) */
#define WRITE_DWORD_LE_U(addr, val) \
do { \
(addr)[0] = (val)&0xFF; \
(addr)[1] = ((val) >> 8) & 0xFF; \
(addr)[2] = ((val) >> 16) & 0xFF; \
(addr)[3] = ((val) >> 24) & 0xFF; \
} while (0)
#endif /* MEM_ACCESS_H */