From 33a91e242794881fd345cdeac2e7975d1b31edc6 Mon Sep 17 00:00:00 2001 From: Tennessee Carmel-Veilleux Date: Wed, 23 Jul 2014 13:52:56 -0400 Subject: [PATCH] Commit of version 1.4 --- dcc6502.c | 736 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 736 insertions(+) create mode 100644 dcc6502.c diff --git a/dcc6502.c b/dcc6502.c new file mode 100644 index 0000000..15ce259 --- /dev/null +++ b/dcc6502.c @@ -0,0 +1,736 @@ +/**************************************************************/ +/* DCC6502.c -> Main module of: */ +/* Disassembler and Cycle Counter for the 6502 microprocessor */ +/* */ +/* (C) 1998-2001 Tennessee Carmel-Veilleux(veilleux@ameth.org)*/ +/* This code is offered as FREEware. You cannot modify nor */ +/* distribute modified versions of this software without */ +/* prior written consent of the author(s). The author shall */ +/* NOT be responsible for ANY damage purely physical, */ +/* emotional, material and magical to either you or anyone */ +/* in the universe. */ +/**************************************************************/ + +#include +#include + +#define VERSION_INFO "v1.4" +#define NUMBER_OPCODES 151 + +/* The 6502's 13 addressing modes */ +#define IMMED 0 /* Immediate */ +#define ABSOL 1 /* Absolute */ +#define ZEROP 2 /* Zero Page */ +#define IMPLI 3 /* Implied */ +#define INDIA 4 /* Indirect Absolute */ +#define ABSIX 5 /* Absolute indexed with X */ +#define ABSIY 6 /* Absolute indexed with Y */ +#define ZEPIX 7 /* Zero page indexed with X */ +#define ZEPIY 8 /* Zero page indexed with Y */ +#define INDIN 9 /* Indexed indirect (with x) */ +#define ININD 10 /* Indirect indexed (with y) */ +#define RELAT 11 /* Relative */ +#define ACCUM 12 /* Accumulator */ + +#define LSB_FIRST + +typedef struct OPcode { + unsigned char number; /* Number of the opcode */ + unsigned char name; /* Index in the name table */ + unsigned char addressing; /* Addressing mode */ + unsigned char cycles; /* Number of cycles */ + unsigned char cross_page; /* 1 if cross-page boundaries affect cycles */ +} OPcode; + +typedef union +{ +#ifdef LSB_FIRST + struct { unsigned char l,h; } B; +#else + struct { byte h,l; } B; +#endif + unsigned short W; +} word; + +char name_table[56][4]={ + "ADC","AND","ASL","BCC","BCS","BEQ","BIT","BMI","BNE","BPL", + "BRK","BVC","BVS","CLC","CLD","CLI","CLV","CMP","CPX","CPY", + "DEC","DEX","DEY","EOR","INC","INX","INY","JMP","JSR","LDA", + "LDX","LDY","LSR","NOP","ORA","PHA","PHP","PLA","PLP","ROL", + "ROR","RTI","RTS","SBC","SEC","SED","SEI","STA","STX","STY", + "TAX","TAY","TSX","TXA","TXS","TYA"}; + +/* Opcode table */ +OPcode opcode_table[NUMBER_OPCODES] = { + {0x69,0,IMMED,2,1}, /* ADC */ + {0x65,0,ZEROP,3,1}, + {0x75,0,ZEPIX,4,1}, + {0x6D,0,ABSOL,4,1}, + {0x7D,0,ABSIX,4,1}, + {0x79,0,ABSIY,4,1}, + {0x61,0,INDIN,6,1}, + {0x71,0,ININD,5,1}, + + {0x29,1,IMMED,2,1}, /* AND */ + {0x25,1,ZEROP,3,1}, + {0x35,1,ZEPIX,4,1}, + {0x2D,1,ABSOL,4,1}, + {0x3D,1,ABSIX,4,1}, + {0x39,1,ABSIY,4,1}, + {0x21,1,INDIN,6,1}, + {0x31,1,ININD,5,1}, + + {0x0A,2,ACCUM,2,0}, /* ASL */ + {0x06,2,ZEROP,5,0}, + {0x16,2,ZEPIX,6,0}, + {0x0E,2,ABSOL,6,0}, + {0x1E,2,ABSIX,6,0}, + + {0x90,3,RELAT,4,1}, /* BCC */ + + {0xB0,4,RELAT,4,1}, /* BCS */ + + {0xF0,5,RELAT,4,1}, /* BEQ */ + + {0x24,6,ZEROP,3,0}, /* BIT */ + {0x2C,6,ABSOL,4,0}, + + {0x30,7,RELAT,4,1}, /* BMI */ + + {0xD0,8,RELAT,4,1}, /* BNE */ + + {0x10,9,RELAT,4,1}, /* BPL */ + + {0x00,10,IMPLI,7,0}, /* BRK */ + + {0x50,11,RELAT,4,1}, /* BVC */ + + {0x70,12,RELAT,4,1}, /* BVS */ + + {0x18,13,IMPLI,2,0}, /* CLC */ + + {0xD8,14,IMPLI,2,0}, /* CLD */ + + {0x58,15,IMPLI,2,0}, /* CLI */ + + {0xB8,16,IMPLI,2,0}, /* CLV */ + + {0xC9,17,IMMED,2,0}, /* CMP */ + {0xC5,17,ZEROP,3,0}, + {0xD5,17,ZEPIX,4,0}, + {0xCD,17,ABSOL,4,0}, + {0xDD,17,ABSIX,4,0}, + {0xD9,17,ABSIY,4,0}, + {0xC1,17,INDIN,6,0}, + {0xD1,17,ININD,5,0}, + + {0xE0,18,IMMED,2,0}, /* CPX */ + {0xE4,18,ZEROP,3,0}, + {0xEC,18,ABSOL,4,0}, + + {0xC0,19,IMMED,2,0}, /* CPY */ + {0xC4,19,ZEROP,3,0}, + {0xCC,19,ABSOL,4,0}, + + {0xC6,20,ZEROP,5,0}, /* DEC */ + {0xD6,20,ZEPIX,6,0}, + {0xCE,20,ABSOL,6,0}, + {0xDE,20,ABSIX,6,0}, + + {0xCA,21,IMPLI,2,0}, /* DEX */ + + {0x88,22,IMPLI,2,0}, /* DEY */ + + {0x49,23,IMMED,2,1}, /* EOR */ + {0x45,23,ZEROP,3,1}, + {0x55,23,ZEPIX,4,1}, + {0x4D,23,ABSOL,4,1}, + {0x5D,23,ABSIX,4,1}, + {0x59,23,ABSIY,4,1}, + {0x41,23,INDIN,6,1}, + {0x51,23,ININD,5,1}, + + {0xE6,24,ZEROP,5,0}, /* INC */ + {0xF6,24,ZEPIX,6,0}, + {0xEE,24,ABSOL,6,0}, + {0xFE,24,ABSIX,6,0}, + + {0xE8,25,IMPLI,2,0}, /* INX */ + + {0xC8,26,IMPLI,2,0}, /* INY */ + + {0x4C,27,ABSOL,3,0}, /* JMP */ + {0x6C,27,INDIA,5,0}, + + {0x20,28,ABSOL,6,0}, /* JSR */ + + {0xA9,29,IMMED,2,1}, /* LDA */ + {0xA5,29,ZEROP,3,1}, + {0xB5,29,ZEPIX,4,1}, + {0xAD,29,ABSOL,4,1}, + {0xBD,29,ABSIX,4,1}, + {0xB9,29,ABSIY,4,1}, + {0xA1,29,INDIN,6,1}, + {0xB1,29,ININD,5,1}, + + {0xA2,30,IMMED,2,1}, /* LDX */ + {0xA6,30,ZEROP,3,1}, + {0xB6,30,ZEPIY,4,1}, + {0xAE,30,ABSOL,4,1}, + {0xBE,30,ABSIY,4,1}, + + {0xA0,31,IMMED,2,1}, /* LDY */ + {0xA4,31,ZEROP,3,1}, + {0xB4,31,ZEPIX,4,1}, + {0xAC,31,ABSOL,4,1}, + {0xBC,31,ABSIX,4,1}, + + {0x4A,32,ACCUM,2,0}, /* LSR */ + {0x46,32,ZEROP,5,0}, + {0x56,32,ZEPIX,6,0}, + {0x4E,32,ABSOL,6,0}, + {0x5E,32,ABSIX,6,0}, + + {0xEA,33,IMPLI,2,0}, /* NOP */ + + {0x09,34,IMMED,2,0}, /* ORA */ + {0x05,34,ZEROP,3,0}, + {0x15,34,ZEPIX,4,0}, + {0x0D,34,ABSOL,4,0}, + {0x1D,34,ABSIX,4,0}, + {0x19,34,ABSIY,4,0}, + {0x01,34,INDIN,6,0}, + {0x11,34,ININD,5,0}, + + {0x48,35,IMPLI,3,0}, /* PHA */ + + {0x08,36,IMPLI,3,0}, /* PHP */ + + {0x68,37,IMPLI,4,0}, /* PLA */ + + {0x28,38,IMPLI,4,0}, /* PLP */ + + {0x2A,39,ACCUM,2,0}, /* ROL */ + {0x26,39,ZEROP,5,0}, + {0x36,39,ZEPIX,6,0}, + {0x2E,39,ABSOL,6,0}, + {0x3E,39,ABSIX,6,0}, + + {0x6A,40,ACCUM,2,0}, /* ROR */ + {0x66,40,ZEROP,5,0}, + {0x76,40,ZEPIX,6,0}, + {0x6E,40,ABSOL,6,0}, + {0x7E,40,ABSIX,6,0}, + + {0x40,41,IMPLI,6,0}, /* RTI */ + + {0x60,42,IMPLI,6,0}, /* RTS */ + + {0xE9,43,IMMED,2,1}, /* SBC */ + {0xE5,43,ZEROP,3,1}, + {0xF5,43,ZEPIX,4,1}, + {0xED,43,ABSOL,4,1}, + {0xFD,43,ABSIX,4,1}, + {0xF9,43,ABSIY,4,1}, + {0xE1,43,INDIN,6,1}, + {0xF1,43,ININD,5,1}, + + {0x38,44,IMPLI,2,0}, /* SEC */ + + {0xF8,45,IMPLI,2,0}, /* SED */ + + {0x78,46,IMPLI,2,0}, /* SEI */ + + {0x85,47,ZEROP,3,0}, /* STA */ + {0x95,47,ZEPIX,4,0}, + {0x8D,47,ABSOL,4,0}, + {0x9D,47,ABSIX,4,0}, + {0x99,47,ABSIY,4,0}, + {0x81,47,INDIN,6,0}, + {0x91,47,ININD,5,0}, + + {0x86,48,ZEROP,3,0}, /* STX */ + {0x96,48,ZEPIY,4,0}, + {0x8E,48,ABSOL,4,0}, + + {0x84,49,ZEROP,3,0}, /* STY */ + {0x94,49,ZEPIX,4,0}, + {0x8C,49,ABSOL,4,0}, + + {0xAA,50,IMPLI,2,0}, /* TAX */ + + {0xA8,51,IMPLI,2,0}, /* TAY */ + + {0xBA,52,IMPLI,2,0}, /* TSX */ + + {0x8A,53,IMPLI,2,0}, /* TXA */ + + {0x9A,54,IMPLI,2,0}, /* TXS */ + + {0x98,55,IMPLI,2,0} /* TYA */ +}; + +unsigned short org; /* Origin of addresses */ +char hex_output = 0; /* 1 if hex output is desired at beginning of line */ +char cycle_counting = 0; /* 1 if we want cycle counting */ +char nes_mode = 0; /* 1 if NES commenting and warnings are enabled */ +FILE *f; /* Input file */ +unsigned char buffer[0xffff]; /* Memory buffer */ +unsigned short PC=0; /* Program counter */ +unsigned short max=0xffff; /* Maximum number of bytes to disassemble */ +char line[512]; + +/* This function emits a comment header with information about the file + being disassembled */ + +void emit_header(char *filename, int fsize, unsigned short org) { + fprintf(stdout,"; Source generated by DCC6502 version %s\n",VERSION_INFO); + fprintf(stdout,"; For more info about DCC6502, e-mail veilleux@ameth.org\n;\n"); + fprintf(stdout,"; FILENAME: %s, File Size: %d, ORG: $%04X\n",filename,fsize,org); + if (hex_output) fprintf(stdout,"; -> Hex output enabled\n"); + if (cycle_counting) fprintf(stdout,"; -> Cycle counting enabled\n"); + if (nes_mode) fprintf(stdout,"; -> NES mode enabled\n"); + fprintf(stdout,";---------------------------------------------------------------------------\n"); +} + +/* This function appends cycle counting to the comment block */ +void append_cycle(char *input, unsigned char entry, unsigned short arg, unsigned short cur_PC) { + char tmpstr[256]; + int cycles = 0; + + cycles = opcode_table[entry].cycles; + + sprintf(tmpstr," Cycles: %d ",cycles); + if (opcode_table[entry].cross_page) strcat(tmpstr,"*!* "); + strcat(input,tmpstr); +} + +void add_nes_str(char *instr, char *instr2) { + strcat(instr," [NES] "); + strcat(instr,instr2); +} + +/* This function put NES-specific info in the comment block */ +void append_nes(char *input, unsigned short arg) { + + switch(arg) { + case 0x2000: add_nes_str(input,"PPU setup #1"); break; + case 0x2001: add_nes_str(input,"PPU setup #2"); break; + case 0x2002: add_nes_str(input,"PPU status"); break; + case 0x2003: add_nes_str(input,"SPR-RAM address select"); break; + case 0x2004: add_nes_str(input,"SPR-RAM data"); break; + case 0x2005: add_nes_str(input,"PPU scroll"); break; + case 0x2006: add_nes_str(input,"VRAM address select"); break; + case 0x2007: add_nes_str(input,"VRAM data"); break; + case 0x4000: add_nes_str(input,"Audio -> Square 1"); break; + case 0x4001: add_nes_str(input,"Audio -> Square 1"); break; + case 0x4002: add_nes_str(input,"Audio -> Square 1"); break; + case 0x4003: add_nes_str(input,"Audio -> Square 1"); break; + case 0x4004: add_nes_str(input,"Audio -> Square 2"); break; + case 0x4005: add_nes_str(input,"Audio -> Square 2"); break; + case 0x4006: add_nes_str(input,"Audio -> Square 2"); break; + case 0x4007: add_nes_str(input,"Audio -> Square 2"); break; + case 0x4008: add_nes_str(input,"Audio -> Triangle"); break; + case 0x4009: add_nes_str(input,"Audio -> Triangle"); break; + case 0x400a: add_nes_str(input,"Audio -> Triangle"); break; + case 0x400b: add_nes_str(input,"Audio -> Triangle"); break; + case 0x400c: add_nes_str(input,"Audio -> Noise control reg"); break; + case 0x400e: add_nes_str(input,"Audio -> Noise Frequency reg #1"); break; + case 0x400f: add_nes_str(input,"Audio -> Noise Frequency reg #2"); break; + case 0x4010: add_nes_str(input,"Audio -> DPCM control"); break; + case 0x4011: add_nes_str(input,"Audio -> DPCM D/A data"); break; + case 0x4012: add_nes_str(input,"Audio -> DPCM address"); break; + case 0x4013: add_nes_str(input,"Audio -> DPCM data length"); break; + case 0x4014: add_nes_str(input,"Sprite DMA trigger"); break; + case 0x4015: add_nes_str(input,"IRQ status / Sound enable"); break; + case 0x4016: add_nes_str(input,"Joypad & I/O port for port #1"); break; + case 0x4017: add_nes_str(input,"Joypad & I/O port for port #2"); break; + } +} + +/* This function disassembles the opcode at the PC and outputs it in *output */ +void disassemble(char *output) { + unsigned char tmp_byte1, tmp_byte2, opcode; + char argument_signed; + word tmp_word; + + char tmpstr[256],tmpstr2[256],tmpstr3[256]; + + int i,j,entry,found = 0; + + opcode = buffer[PC]; + + for (i = 0; i < NUMBER_OPCODES; i++) { + if (opcode == opcode_table[i].number) { + found = 1; /* Found the opcode */ + entry = i; /* Note the entry number in the table */ + } + } + + if (!found) { + if (hex_output) { + sprintf(tmpstr,"$%04X> %02X:\t.byte $%02x\t\t; INVALID OPCODE !!!\n",org+PC,opcode,opcode); + strncpy(output, tmpstr, 254); + } else { + sprintf(tmpstr,"$%04X\t.byte $%02x\t; INVALID OPCODE !!!\n",org+PC,opcode); + strncpy(output, tmpstr, 254); + } + } else { + switch (opcode_table[entry].addressing) { + case IMMED: + PC++; + tmp_byte1 = buffer[PC]; /* Get immediate value */ + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X:\t%s #$%02x\t;",org+PC-1,opcode,tmp_byte1,name_table[opcode_table[entry].name],tmp_byte1); + else + sprintf(tmpstr,"$%04X\t%s #$%02x\t;",org+PC-1,name_table[opcode_table[entry].name],tmp_byte1); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC-1,org+PC-1); + strncpy(output,tmpstr,254); + break; + + case ABSOL: + PC++; + tmp_word.B.l = buffer[PC]; /* Get low byte of address */ + PC++; + tmp_word.B.h = buffer[PC]; /* Get high byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X%02X:\t%s $%02X%02X\t;",org+PC-2,opcode,tmp_word.B.l,tmp_word.B.h,name_table[opcode_table[entry].name],tmp_word.B.h,tmp_word.B.l); + else + sprintf(tmpstr,"$%04X\t%s $%02X%02X\t;",org+PC-2,name_table[opcode_table[entry].name],tmp_word.B.h,tmp_word.B.l); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,tmp_word.W,org+PC-2); + + /* Add NES port info if necessary */ + if (nes_mode) append_nes(tmpstr,tmp_word.W); + strncpy(output,tmpstr,254); + break; + + case ZEROP: + PC++; + tmp_byte1 = buffer[PC]; /* Get low byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X:\t%s $%02X\t\t;",org+PC-1,opcode,tmp_byte1,name_table[opcode_table[entry].name],tmp_byte1); + else + sprintf(tmpstr,"$%04X\t%s $%02X\t\t;",org+PC-1,name_table[opcode_table[entry].name],tmp_byte1); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC-1,org+PC-1); + + strncpy(output,tmpstr,254); + break; + + case IMPLI: + if (hex_output) + sprintf(tmpstr,"$%04X> %02X:\t%s\t\t;",org+PC,opcode,name_table[opcode_table[entry].name]); + else + sprintf(tmpstr,"$%04X\t%s\t\t;",org+PC,name_table[opcode_table[entry].name]); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC,org+PC); + + strncpy(output,tmpstr,254); + break; + + case INDIA: + PC++; + tmp_word.B.l = buffer[PC]; /* Get low byte of address */ + PC++; + tmp_word.B.h = buffer[PC]; /* Get high byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X%02X:\t%s ($%02X%02X)\t;",org+PC-2,opcode,tmp_word.B.l,tmp_word.B.h,name_table[opcode_table[entry].name],tmp_word.B.h,tmp_word.B.l); + else + sprintf(tmpstr,"$%04X\t%s ($%02X%02X)\t;",org+PC-2,name_table[opcode_table[entry].name],tmp_word.B.h,tmp_word.B.l); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,tmp_word.W,org+PC-2); + + strncpy(output,tmpstr,254); + break; + + case ABSIX: + PC++; + tmp_word.B.l = buffer[PC]; /* Get low byte of address */ + PC++; + tmp_word.B.h = buffer[PC]; /* Get high byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X%02X:\t%s $%02X%02X,X\t;",org+PC-2,opcode,tmp_word.B.l,tmp_word.B.h,name_table[opcode_table[entry].name],tmp_word.B.h,tmp_word.B.l); + else + sprintf(tmpstr,"$%04X\t%s $%02X%02X,X\t;",org+PC-2,name_table[opcode_table[entry].name],tmp_word.B.h,tmp_word.B.l); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,tmp_word.W,org+PC-2); + + /* Add NES port info if necessary */ + if (nes_mode) append_nes(tmpstr,tmp_word.W); + strncpy(output,tmpstr,254); + break; + + case ABSIY: + PC++; + tmp_word.B.l = buffer[PC]; /* Get low byte of address */ + PC++; + tmp_word.B.h = buffer[PC]; /* Get high byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X%02X:\t%s $%02X%02X,Y\t;",org+PC-2,opcode,tmp_word.B.l,tmp_word.B.h,name_table[opcode_table[entry].name],tmp_word.B.h,tmp_word.B.l); + else + sprintf(tmpstr,"$%04X\t%s $%02X%02X,Y\t;",org+PC-2,name_table[opcode_table[entry].name],tmp_word.B.h,tmp_word.B.l); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,tmp_word.W,org+PC-2); + + /* Add NES port info if necessary */ + if (nes_mode) append_nes(tmpstr,tmp_word.W); + strncpy(output,tmpstr,254); + break; + + case ZEPIX: + PC++; + tmp_byte1 = buffer[PC]; /* Get low byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X:\t%s $%02X,X\t\t;",org+PC-1,opcode,tmp_byte1,name_table[opcode_table[entry].name],tmp_byte1); + else + sprintf(tmpstr,"$%04X\t%s $%02X,X\t;",org+PC-1,name_table[opcode_table[entry].name],tmp_byte1); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC-1,org+PC-1); + + strncpy(output,tmpstr,254); + break; + + case ZEPIY: + PC++; + tmp_byte1 = buffer[PC]; /* Get low byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X:\t%s $%02X,Y\t\t;",org+PC-1,opcode,tmp_byte1,name_table[opcode_table[entry].name],tmp_byte1); + else + sprintf(tmpstr,"$%04X\t%s $%02X,Y\t;",org+PC-1,name_table[opcode_table[entry].name],tmp_byte1); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC-1,org+PC-1); + + strncpy(output,tmpstr,254); + break; + + case INDIN: + PC++; + tmp_byte1 = buffer[PC]; /* Get low byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X:\t%s ($%02X,X)\t\t;",org+PC-1,opcode,tmp_byte1,name_table[opcode_table[entry].name],tmp_byte1); + else + sprintf(tmpstr,"$%04X\t%s ($%02X,X)\t;",org+PC-1,name_table[opcode_table[entry].name],tmp_byte1); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC-1,org+PC-1); + + strncpy(output,tmpstr,254); + break; + + case ININD: + PC++; + tmp_byte1 = buffer[PC]; /* Get low byte of address */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X:\t%s ($%02X),Y\t\t;",org+PC-1,opcode,tmp_byte1,name_table[opcode_table[entry].name],tmp_byte1); + else + sprintf(tmpstr,"$%04X\t%s ($%02X),Y\t;",org+PC-1,name_table[opcode_table[entry].name],tmp_byte1); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC-1,org+PC-1); + + strncpy(output,tmpstr,254); + break; + + case RELAT: + PC++; + tmp_byte1 = buffer[PC]; /* Get relative modifier */ + + if (hex_output) + sprintf(tmpstr,"$%04X> %02X %02X:\t%s $%04X\t\t;",org+PC-1,opcode,tmp_byte1,name_table[opcode_table[entry].name],(org+PC)+(signed char)(tmp_byte1)+1); + else + sprintf(tmpstr,"$%04X\t%s $%04X\t;",org+PC-1,name_table[opcode_table[entry].name],(org+PC)+(signed char)(tmp_byte1)+1); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC,org+PC); + + strncpy(output,tmpstr,254); + break; + + case ACCUM: + if (hex_output) + sprintf(tmpstr,"$%04X> %02X:\t%s A\t\t;",org+PC,opcode,name_table[opcode_table[entry].name]); + else + sprintf(tmpstr,"$%04X\t%s A\t\t;",org+PC,name_table[opcode_table[entry].name]); + + /* Add cycle count if necessary */ + if (cycle_counting) append_cycle(tmpstr,entry,org+PC,org+PC); + + strncpy(output,tmpstr,254); + break; + + default: + break; + } + } + +} + +void version(void) { + fprintf(stderr,"DCC6502 %s (C)1998-2001 Tennessee Carmel-Veilleux\n",VERSION_INFO); + fprintf(stderr,"This is free software. To see the LICENSE, use the -v parameter\n"); +} + +void usage_helper(char *str) { + fprintf(stderr,"\t%s\n",str); +} + +void usage(void) { + usage_helper("-? -> Show this help message"); + usage_helper("-oXXXX -> Set the origin (ORG) [dfl: $8000]"); + usage_helper("-h -> Get hex info about disassembly"); + usage_helper("-mXXXX -> Only disassemble the first XXXX bytes"); + usage_helper("-n -> Enable NES mode"); + usage_helper("-v -> Get only version information"); + usage_helper("-c -> Get cycle counting info"); + fprintf(stderr,"\n"); +} + +void license(void) { + fprintf(stderr,"(C) 1998-2001 Tennessee Carmel-Veilleux(veilleux@ameth.org)\n"); + fprintf(stderr,"This code is offered as FREEware. You cannot modify nor\n"); + fprintf(stderr,"distribute modified versions of this software without\n"); + fprintf(stderr,"prior written consent of the author(s). The author shall\n"); + fprintf(stderr,"NOT be responsible for ANY damage purely physical,\n"); + fprintf(stderr,"emotional, material and magical to either you or anyone\n"); + fprintf(stderr,"in the universe.\n"); +} + +unsigned short hex2int (char *str, unsigned short dfl) { + char HEX_digits[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'}; + int i,j; + char c,k,shift; + unsigned short tmp=0; + + shift = 0; + for (i = 5; i >= 2; i--) { + if (!isxdigit(str[i])) { + tmp = dfl; + break; + } + c = toupper(str[i]); + for (j = 0; j < 16; j++) { + if (c == HEX_digits[j]) k = j; + } + tmp |= ((k&0xf) << shift); + shift += 4; + } + return tmp; +} + +void set_org(char *str) { + if (strlen(str) < 6) { + fprintf(stderr,"WARNING -> %s is not a valid ORG switch, deafaulting to $8000\n"); + org = 0x8000; + return; + } + + org = hex2int(str,0x8000); +} + +void set_max(char *str) { + if (strlen(str) != 6) { + fprintf(stderr,"WARNING -> %s is not a valid MAX switch, defaulting to $%04X\n",0xffff); + max = 0xFFFF-org; + return; + } + + max = hex2int(str,0xFFFF); +} + +int main(int argc, char *argv[]) { + int i=0; + char c; + char tmpstring[512]; + char filename[512]; + + cycle_counting = 0; + hex_output = 0; + org = 0x8000; + + if (argc < 2) { + version(); + usage(); + exit(1); + } + + if (argc > 2) { + for (i = 1; i < argc - 1; i++) { + if (argv[i][0] != '-') { + version(); + usage(); + fprintf(stderr,"Unrecognized switch: %s\n",argv[i]); + exit(1); + } + switch (argv[i][1]) { + case '?': version(); usage(); license(); exit(0); break; + case 'n': nes_mode = 1; break; + case 'c': cycle_counting = 1; break; + case 'h': hex_output = 1; break; + case 'v': version(); license(); exit(0); break; + case 'o': set_org(argv[i]); break; + case 'm': set_max(argv[i]); break; + + default: version(); usage(); fprintf(stderr,"Unrecognized switch: %s\n",argv[i]); exit(1); + } + } + } else { + + if (argv[1][0] != '-') { + strncpy(filename,argv[1],511); + } else + + switch (argv[1][1]) { + case '?': version(); usage(); license(); exit(0); break; + case 'v': version(); license(); exit(0); break; + default: version(); usage(); fprintf(stderr,"Unrecognized switch: %s\n",argv[1]); exit(1); + } + } + + strncpy(filename,argv[argc-1],511); + + f = fopen(filename,"rb"); + + if (!f) { + version(); + fprintf(stderr,"File not found or invalid filename : %s\n",filename); + exit(1); + } + + i = 0; + while(!feof(f) && ((i+org) < 65535)) { + fread(&buffer[i],1,1,f); + i++; + } + + fclose(f); + + emit_header(filename,i,org); + PC = 0; + while(PC+org < 65535 && PC <= max) { + disassemble(tmpstring); + fprintf(stdout,"%s\n",tmpstring); + PC++; + } + + return 0; +}