nes-proj/cpu/z80/loader/mef.h

96 lines
2.6 KiB
C

/*
* Copyright (c) 2007, Takahide Matsutsuka.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id: mef.h,v 1.1 2007/11/28 06:13:24 matsutsuka Exp $
*
*/
/*
* \file
* mef.h
* The Micro Executable Format
* \author
* Takahide Matsutsuka <markn@markn.org>
*/
/*
* MEF file format:
* [AreaDecls]
* BYTE nAreas (0-15)
* struct AreaSize[nAreas]
* [Data]
* binary*
* [Relocation]
* WORD nRelocs
* struct Relocation[nRelocs]
*/
#ifndef __MEF_H__
#define __MEF_H__
/*
* mode
* bit 7: read/write (1) / read only (0)
* bit 3-0: Area index
* checksum
* just a sum of all data of the area
*/
#define MEF_AREA_RW 0x80
#define MEF_AREA_MAX 0x10
struct Area {
unsigned char mode;
uint16_t size;
uint16_t checksum;
};
/*
* mode
* bit 7: Absolute (1) / Relative (0)
* bit 6: MSB (1) / LSB (0) (in byte mode)
* bit 5: Byte mode (1) / Word mode (0)
*/
#define MEF_RELOC_ABSOLUTE 0x80
#define MEF_RELOC_MSB_BYTE 0x60
#define MEF_RELOC_LSB_BYTE 0x20
struct Relocation {
unsigned char mode;
uint16_t address;
uint16_t data;
};
unsigned char load_byte();
void mef_load(unsigned char* offset);
unsigned char load_byte();
void mef_reloc(unsigned char* offset, struct Relocation* reloc);
#endif /* __MEF_H__ */