/**************************************************************/ /* DCC6502.c -> Main module of: */ /* Disassembler and Cycle Counter for the 6502 microprocessor */ /* */ /* (C) 1998-2003 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. */ /**************************************************************/ #include #include #include #define VERSION_INFO "v1.6" #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)1998-2003 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) 1998-2003 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"); } 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, defaulting to $8000\n",str); org = 0x8000; return; } org = hex2int(str,0x8000); } void set_max(char *str) { if (strlen(str) != 6) { max = 0xFFFF-org; fprintf(stderr,"WARNING -> %s is not a valid MAX switch, defaulting to $%04X\n",str,max); 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) && (PC < i)) { disassemble(tmpstring); fprintf(stdout,"%s\n",tmpstring); PC++; } return 0; }