disassembler + first emulated commands
This commit is contained in:
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03af849213
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1d5d33a613
7 changed files with 566 additions and 0 deletions
BIN
ROM/invaders
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ROM/invaders
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ROM/invaders.e
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ROM/invaders.e
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ROM/invaders.f
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ROM/invaders.f
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ROM/invaders.g
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ROM/invaders.g
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ROM/invaders.h
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ROM/invaders.h
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disassembler.c
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disassembler.c
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#include<stdio.h>
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#include<stdlib.h>
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// gcc disassembler.c -o disassembler
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typedef struct buffer {
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unsigned char* buffer;
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int length;
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} buffer;
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buffer* read_file(char** argv) {
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FILE* file = fopen(argv[1], "rb");
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if (file == NULL) {
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printf("Issue opening the file.\n");
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return NULL;
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}
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//Get the file size and read it into a memory buffer
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fseek(file, 0L, SEEK_END);
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int fsize = ftell(file);
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fseek(file, 0L, SEEK_SET);
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buffer *b = malloc(sizeof(buffer));
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b->buffer=malloc(fsize);
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b->length=fsize;
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fread(b->buffer, fsize, 1, file);
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fclose(file);
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return b;
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}
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void print_buffer(buffer* b) {
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for (int i = 0; i < 40; i++) {
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printf("%02x \n", b->buffer[i]);
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}
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}
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int disassemble8080(buffer* b, int pc) {
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unsigned char *code = &(b->buffer[pc]);
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int opbytes = 1;
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printf("%04x ", pc);
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switch (*code) {
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case 0x00: printf("NOP"); break;
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case 0x01: printf("LXI B,#$%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x02: printf("STAX B"); break;
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case 0x03: printf("INX B"); break;
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case 0x04: printf("INR B"); break;
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case 0x05: printf("DCR B"); break;
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case 0x06: printf("MVI B,#$%02x", code[1]); opbytes = 2; break;
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case 0x07: printf("RLC"); break;
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case 0x08: printf("NOP"); break;
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case 0x09: printf("DAD B"); break;
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case 0x0a: printf("LDAX B"); break;
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case 0x0b: printf("DCX B"); break;
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case 0x0c: printf("INR C"); break;
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case 0x0d: printf("DCR C"); break;
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case 0x0e: printf("MVI C,#$%02x", code[1]); opbytes = 2; break;
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case 0x0f: printf("RRC"); break;
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case 0x10: printf("NOP"); break;
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case 0x11: printf("LXI D,#$%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x12: printf("STAX D"); break;
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case 0x13: printf("INX D"); break;
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case 0x14: printf("INR D"); break;
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case 0x15: printf("DCR D"); break;
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case 0x16: printf("MVI D,#$%02x", code[1]); opbytes = 2; break;
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case 0x17: printf("RAL"); break;
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case 0x18: printf("NOP"); break;
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case 0x19: printf("DAD D"); break;
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case 0x1a: printf("LDAX D"); break;
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case 0x1b: printf("DCX D"); break;
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case 0x1c: printf("INR E"); break;
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case 0x1d: printf("DCR E"); break;
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case 0x1e: printf("MVI E,#$%02x", code[1]); opbytes = 2; break;
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case 0x1f: printf("RAR"); break;
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case 0x20: printf("NOP"); break;
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case 0x21: printf("LXI H,#$%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x22: printf("SHLD $%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x23: printf("INX H"); break;
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case 0x24: printf("INR H"); break;
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case 0x25: printf("DCR H"); break;
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case 0x26: printf("MVI H,#$%02x", code[1]); opbytes = 2; break;
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case 0x27: printf("DAA"); break;
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case 0x28: printf("NOP"); break;
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case 0x29: printf("DAD H"); break;
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case 0x2a: printf("LHLD $%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x2b: printf("DCX H"); break;
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case 0x2c: printf("INR L"); break;
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case 0x2d: printf("DCR L"); break;
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case 0x2e: printf("MVI L,#$%02x", code[1]); opbytes = 2; break;
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case 0x2f: printf("CMA"); break;
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case 0x30: printf("NOP"); break;
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case 0x31: printf("LXI SP,#$%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x32: printf("STA $%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x33: printf("INX SP"); break;
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case 0x34: printf("INR M"); break;
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case 0x35: printf("DCR M"); break;
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case 0x36: printf("MVI M,#$%02x", code[1]); opbytes = 2; break;
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case 0x37: printf("STC"); break;
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case 0x38: printf("NOP"); break;
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case 0x39: printf("DAD SP"); break;
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case 0x3a: printf("LDA $%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x3b: printf("DCX SP"); break;
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case 0x3c: printf("INR A"); break;
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case 0x3d: printf("DCR A"); break;
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case 0x3e: printf("MVI A,#$%02x", code[1]); opbytes = 2; break;
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case 0x3f: printf("CMC"); break;
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case 0x40: printf("MOV B,B"); break;
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case 0x41: printf("MOV B,C"); break;
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case 0x42: printf("MOV B,D"); break;
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case 0x43: printf("MOV B,E"); break;
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case 0x44: printf("MOV B,H"); break;
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case 0x45: printf("MOV B,L"); break;
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case 0x46: printf("MOV B,M"); break;
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case 0x47: printf("MOV B,A"); break;
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case 0x48: printf("MOV C,B"); break;
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case 0x49: printf("MOV C,C"); break;
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case 0x4a: printf("MOV C,D"); break;
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case 0x4b: printf("MOV C,E"); break;
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case 0x4c: printf("MOV C,H"); break;
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case 0x4d: printf("MOV C,L"); break;
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case 0x4e: printf("MOV C,M"); break;
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case 0x4f: printf("MOV C,A"); break;
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case 0x50: printf("MOV D,B"); break;
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case 0x51: printf("MOV D,C"); break;
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case 0x52: printf("MOV D,D"); break;
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case 0x53: printf("MOV D,E"); break;
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case 0x54: printf("MOV D,H"); break;
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case 0x55: printf("MOV D,L"); break;
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case 0x56: printf("MOV D,M"); break;
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case 0x57: printf("MOV D,A"); break;
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case 0x58: printf("MOV E,B"); break;
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case 0x59: printf("MOV E,C"); break;
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case 0x5a: printf("MOV E,D"); break;
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case 0x5b: printf("MOV E,E"); break;
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case 0x5c: printf("MOV E,H"); break;
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case 0x5d: printf("MOV E,L"); break;
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case 0x5e: printf("MOV E,M"); break;
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case 0x5f: printf("MOV E,A"); break;
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case 0x60: printf("MOV H,B"); break;
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case 0x61: printf("MOV H,C"); break;
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case 0x62: printf("MOV H,D"); break;
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case 0x63: printf("MOV H,E"); break;
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case 0x64: printf("MOV H,H"); break;
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case 0x65: printf("MOV H,L"); break;
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case 0x66: printf("MOV H,M"); break;
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case 0x67: printf("MOV H,A"); break;
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case 0x68: printf("MOV L,B"); break;
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case 0x69: printf("MOV L,C"); break;
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case 0x6a: printf("MOV L,D"); break;
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case 0x6b: printf("MOV L,E"); break;
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case 0x6c: printf("MOV L,H"); break;
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case 0x6d: printf("MOV L,L"); break;
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case 0x6e: printf("MOV L,M"); break;
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case 0x6f: printf("MOV L,A"); break;
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case 0x70: printf("MOV M,B"); break;
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case 0x71: printf("MOV M,C"); break;
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case 0x72: printf("MOV M,D"); break;
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case 0x73: printf("MOV M,E"); break;
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case 0x74: printf("MOV M,H"); break;
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case 0x75: printf("MOV M,L"); break;
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case 0x76: printf("HLT"); break;
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case 0x77: printf("MOV M,A"); break;
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case 0x78: printf("MOV A,B"); break;
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case 0x79: printf("MOV A,C"); break;
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case 0x7a: printf("MOV A,D"); break;
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case 0x7b: printf("MOV A,E"); break;
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case 0x7c: printf("MOV A,H"); break;
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case 0x7d: printf("MOV A,L"); break;
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case 0x7e: printf("MOV A,M"); break;
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case 0x7f: printf("MOV A,A"); break;
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case 0x80: printf("ADD B"); break;
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case 0x81: printf("ADD C"); break;
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case 0x82: printf("ADD D"); break;
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case 0x83: printf("ADD E"); break;
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case 0x84: printf("ADD H"); break;
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case 0x85: printf("ADD L"); break;
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case 0x86: printf("ADD M"); break;
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case 0x87: printf("ADD A"); break;
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case 0x88: printf("ADC B"); break;
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case 0x89: printf("ADC C"); break;
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case 0x8a: printf("ADC D"); break;
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case 0x8b: printf("ADC E"); break;
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case 0x8c: printf("ADC H"); break;
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case 0x8d: printf("ADC L"); break;
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case 0x8e: printf("ADC M"); break;
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case 0x8f: printf("ADC A"); break;
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case 0x90: printf("SUB B"); break;
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case 0x91: printf("SUB C"); break;
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case 0x92: printf("SUB D"); break;
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case 0x93: printf("SUB E"); break;
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case 0x94: printf("SUB H"); break;
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case 0x95: printf("SUB L"); break;
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case 0x96: printf("SUB M"); break;
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case 0x97: printf("SUB A"); break;
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case 0x98: printf("SBB B"); break;
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case 0x99: printf("SBB C"); break;
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case 0x9a: printf("SBB D"); break;
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case 0x9b: printf("SBB E"); break;
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case 0x9c: printf("SBB H"); break;
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case 0x9d: printf("SBB L"); break;
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case 0x9e: printf("SBB M"); break;
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case 0x9f: printf("SBB A"); break;
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case 0xa0: printf("ANA B"); break;
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case 0xa1: printf("ANA C"); break;
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case 0xa2: printf("ANA D"); break;
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case 0xa3: printf("ANA E"); break;
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case 0xa4: printf("ANA H"); break;
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case 0xa5: printf("ANA L"); break;
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case 0xa6: printf("ANA M"); break;
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case 0xa7: printf("ANA A"); break;
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case 0xa8: printf("XRA B"); break;
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case 0xa9: printf("XRA C"); break;
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case 0xaa: printf("XRA D"); break;
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case 0xab: printf("XRA E"); break;
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case 0xac: printf("XRA H"); break;
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case 0xad: printf("XRA L"); break;
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case 0xae: printf("XRA M"); break;
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case 0xaf: printf("XRA A"); break;
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case 0xb0: printf("ORA B"); break;
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case 0xb1: printf("ORA C"); break;
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case 0xb2: printf("ORA D"); break;
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case 0xb3: printf("ORA E"); break;
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case 0xb4: printf("ORA H"); break;
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case 0xb5: printf("ORA L"); break;
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case 0xb6: printf("ORA M"); break;
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case 0xb7: printf("ORA A"); break;
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case 0xb8: printf("CMP B"); break;
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case 0xb9: printf("CMP C"); break;
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case 0xba: printf("CMP D"); break;
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case 0xbb: printf("CMP E"); break;
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case 0xbc: printf("CMP H"); break;
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case 0xbd: printf("CMP L"); break;
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case 0xbe: printf("CMP M"); break;
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case 0xbf: printf("CMP A"); break;
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case 0xc0: printf("RNZ"); break;
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case 0xc1: printf("POP B"); break;
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case 0xc2: printf("JNZ $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xc3: printf("JMP $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xc4: printf("CNZ $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xc5: printf("PUSH B"); break;
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case 0xc6: printf("ADI,#$%02x", code[1]); opbytes = 2; break;
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case 0xc7: printf("RST 0"); break;
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case 0xc8: printf("RZ"); break;
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case 0xc9: printf("RET"); break;
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case 0xca: printf("JZ $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xcb: printf("NOP"); break;
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case 0xcc: printf("CZ $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xcd: printf("CALL $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xce: printf("ACI,#$%02x", code[1]); opbytes = 2; break;
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case 0xcf: printf("RST 1"); break;
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case 0xd0: printf("RNC"); break;
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case 0xd1: printf("POP D"); break;
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case 0xd2: printf("JNC $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xd3: printf("OUT #$%02x", code[1]); opbytes = 2; break;
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case 0xd4: printf("CNC $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xd5: printf("PUSH D"); break;
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case 0xd6: printf("SUI,#$%02x", code[1]); opbytes = 2; break;
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case 0xd7: printf("RST 2"); break;
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case 0xd8: printf("RC"); break;
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case 0xd9: printf("NOP"); break;
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case 0xda: printf("JC $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xdb: printf("IN #$%02x", code[1]); opbytes = 2; break;
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case 0xdc: printf("CC $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xdd: printf("NOP"); break;
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case 0xde: printf("SBI,#$%02x", code[1]); opbytes = 2; break;
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case 0xdf: printf("RST 3"); break;
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case 0xe0: printf("RPO"); break;
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case 0xe1: printf("POP H"); break;
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case 0xe2: printf("JPO $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xe3: printf("XTHL"); break;
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case 0xe4: printf("CPO $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xe5: printf("PUSH H"); break;
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case 0xe6: printf("ANI,#$%02x", code[1]); opbytes = 2; break;
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case 0xe7: printf("RST 4"); break;
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case 0xe8: printf("RPE"); break;
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case 0xe9: printf("PCHL"); break;
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case 0xea: printf("JPE $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xeb: printf("XCHG"); break;
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case 0xec: printf("CPE $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xed: printf("NOP"); break;
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case 0xee: printf("XRI,#$%02x", code[1]); opbytes = 2; break;
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case 0xef: printf("RST 5"); break;
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case 0xf0: printf("RP"); break;
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case 0xf1: printf("POP PSW"); break;
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case 0xf2: printf("JP $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xf3: printf("DI"); break;
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case 0xf4: printf("CP $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xf5: printf("PUSH PSW"); break;
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case 0xf6: printf("ORI,#$%02x", code[1]); opbytes = 2; break;
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case 0xf7: printf("RST 6"); break;
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case 0xf8: printf("RM"); break;
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case 0xf9: printf("SPHL"); break;
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case 0xfa: printf("JM $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xfb: printf("EI"); break;
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case 0xfc: printf("CM $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xfd: printf("NOP"); break;
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case 0xfe: printf("CPI,#$%02x", code[1]); opbytes = 2; break;
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case 0xff: printf("RST 7"); break;
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}
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printf("\n");
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return opbytes;
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}
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int main (int argc, char** argv) {
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int pc = 0; //Program Counter
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buffer* buff = read_file(argv);
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if (buff == NULL) {
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printf("Fatal error.\n");
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return 1;
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}
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print_buffer(buff);
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while (pc < 40) {//buff->length) {
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pc += disassemble8080(buff, pc);
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}
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free(buff);
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return 0;
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}
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213
emulator_shell.c
Normal file
213
emulator_shell.c
Normal file
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#include <stdio.h>
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#include <stdint.h> // for the uintx_t's
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typedef struct ConditionCodes {
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//bitfields for condition codes
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//the number following the variables sets the number of bits
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uint8_t z:1;
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uint8_t s:1;
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uint8_t p:1;
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uint8_t cy:1;
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uint8_t ac:1;
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uint8_t pad:3;
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} ConditionCodes;
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typedef struct State8080 {
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uint8_t a;
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uint8_t b;
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uint8_t c;
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uint8_t d;
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||||
uint8_t e;
|
||||
uint8_t h;
|
||||
uint8_t l;
|
||||
uint16_t sp;
|
||||
uint16_t pc;
|
||||
uint8_t *memory;
|
||||
struct ConditionCodes cc;
|
||||
uint8_t int_enable;
|
||||
} State8080;
|
||||
|
||||
int unknownInstruction(State8080* state) {
|
||||
printf("Error: Unknown instruction");
|
||||
return 1;
|
||||
}
|
||||
|
||||
int parity(int x, int size)
|
||||
{
|
||||
int i;
|
||||
int p = 0;
|
||||
x = (x & ((1<<size)-1));
|
||||
for (i=0; i<size; i++)
|
||||
{
|
||||
if (x & 0x1) p++;
|
||||
x = x >> 1;
|
||||
}
|
||||
return (0 == (p & 0x1));
|
||||
}
|
||||
|
||||
int emulate8080(State8080* state) {
|
||||
unsigned char *opcode = &(state->memory[state->pc]);
|
||||
|
||||
switch(*opcode) {
|
||||
case 0x00: break; // NOP does nothing
|
||||
case 0x01: // LXI B, word
|
||||
state->c = opcode[1];
|
||||
state->b = opcode[2];
|
||||
state->pc += 2;
|
||||
break;
|
||||
case 0x05: // DCR B
|
||||
uint8_t res = state->b - 1;
|
||||
state->b = res;
|
||||
state->cc.z = (res == 0);
|
||||
state->cc.s = ((res & 0x80) != 0);
|
||||
state->cc.p = parity(res, 8);
|
||||
break;
|
||||
case 0x06: // MVI B, byte
|
||||
state->b = opcode[1];
|
||||
state->pc += 1;
|
||||
break;
|
||||
case 0x09: // DAD B
|
||||
uint32_t h1 = (state->h << 8) | state->l;
|
||||
uint32_t bc = (state->b << 8) | state->c;
|
||||
uint32_t res = h1 + bc;
|
||||
state->h = (res & 0xff) >> 8;
|
||||
state->l = res & 0xff;
|
||||
state->cc.cy = ((res > 0xffff) > 0);
|
||||
break;
|
||||
case 0x0e: // MVI C, byte
|
||||
state->c = opcode[1];
|
||||
state->pc += 1;
|
||||
break;
|
||||
case 0x11: // LXI D, word
|
||||
state->d = opcode[2];
|
||||
state->e = opcode[1];
|
||||
state->pc += 2;
|
||||
case 0x21: // LXI H, word
|
||||
state->h = opcode[2];
|
||||
state->l = opcode[1];
|
||||
state->pc += 2;
|
||||
case 0x26: // MVI H, byte
|
||||
state->h = opcode[1];
|
||||
state->pc += 1;
|
||||
break;
|
||||
case 0x31: // LXI SP, word
|
||||
state->sp = (opcode[2] << 8) | opcode[1]);
|
||||
state->pc += 2;
|
||||
case 0x36: // MVI M, byte
|
||||
state->m = opcode[1];
|
||||
state->pc += 1;
|
||||
break;
|
||||
case 0x3e: // MVI A, byte
|
||||
state->a = opcode[1];
|
||||
state->pc += 1;
|
||||
case 0x41: // MOV B, C
|
||||
state->b = state->c;
|
||||
break;
|
||||
case 0x42: // MOV B, D
|
||||
state->b = state->d;
|
||||
break;
|
||||
case 0x43: // MOV B, E
|
||||
state->b = state->e;
|
||||
break;
|
||||
case 0x80: // ADD B
|
||||
uint16_t answer = (uint16_t) state->a + (uint16_t) state->b;
|
||||
state->cc.z = ((answer & 0xff) == 0);
|
||||
state->cc.s = ((answer & 0x80) != 0);
|
||||
state->cc.cy = (answer > 0xff);
|
||||
state->cc.p = parity(answer & 0xff);
|
||||
state->a = answer & 0xff;
|
||||
break;
|
||||
|
||||
case 0x86: // ADD M
|
||||
uint16_t offset = (state->h<<8) | (state->l);
|
||||
uint16_t answer = (uint16_t) state->a + state->memory[offset];
|
||||
state->cc.z = ((answer & 0xff) == 0);
|
||||
state->cc.s = ((answer & 0x80) != 0);
|
||||
state->cc.cy = (answer > 0xff);
|
||||
state->cc.p = parity(answer & 0xff);
|
||||
state->a = answer & 0xff;
|
||||
break;
|
||||
|
||||
case 0xc1: // POP B
|
||||
state->c = state->memory[state->sp];
|
||||
state->b = state->memory[state->sp+1];
|
||||
state->sp += 2;
|
||||
break;
|
||||
|
||||
case 0xc2: // JNZ adress
|
||||
if (0 = state-> cc.z) {
|
||||
state->pc = (opcode[2] << 8) | opcode[1];
|
||||
} else {
|
||||
state->pc += 2;
|
||||
}
|
||||
break;
|
||||
|
||||
case 0xc3: // JMP adress
|
||||
state->pc = (opcode[2] << 8) | opcode[1];
|
||||
break;
|
||||
|
||||
case 0xc5: // PUSH B
|
||||
state->memory[state->sp-1] = state->b;
|
||||
state->memory[state->sp-2] = state->c;
|
||||
state->sp -= 2;
|
||||
break;
|
||||
|
||||
|
||||
case 0xc6: // ADI byte
|
||||
uint16_t answer = (uint16_t) state->a + (uint16_t) opcode[1];
|
||||
state->cc.z = ((state->a & 0xff) == 0);
|
||||
state->cc.s = ((state->a & 0x80) != 0);
|
||||
state->cc.cy = (state->a > 0xff);
|
||||
state->cc.p = parity(state->a & 0xff);
|
||||
state->pc += 1;
|
||||
break;
|
||||
case 0xcd: // CALL adress
|
||||
uint16_t ret = state -> pc+2;
|
||||
state->memory[state->sp-1] = (ret >> 8) & 0xff;
|
||||
state->memory[state->sp-2] = (ret & 0xff);
|
||||
state->sp -= 2;
|
||||
state->pc = (opcode[2] << 8) | opcode[1];
|
||||
break;
|
||||
case 0xc9: // RET
|
||||
state->sp += 2;
|
||||
state->pc = (state->memory[state->sp+1] << 8) | state->memory[state->sp];
|
||||
break;
|
||||
|
||||
case 0x2f: // CMA (NOT)
|
||||
state->a = ~state->a;
|
||||
break;
|
||||
case 0xe6: // ANI byte
|
||||
uint8_t x = state->a & opcode[1];
|
||||
state->cc.z = (x == 0);
|
||||
state->cc.s = (0x80 == (x & 0x80));
|
||||
state->cc.cy = 0;
|
||||
state->cc.p = parity(x, 8);
|
||||
state->pc++;
|
||||
break;
|
||||
|
||||
case 0x0f: // RRC
|
||||
uint8_t x = state->a;
|
||||
state->a = ((x & 1) << 7) | (x >> 1);
|
||||
state->cc.cy = (1 == (x & 1));
|
||||
break;
|
||||
|
||||
case 0x1f: // RAR
|
||||
uint8_t x = state->a;
|
||||
state->a = (state->cc.cy << 7) | (x >> 1);
|
||||
state->cc.cy = (1 == (x & 1));
|
||||
break;
|
||||
|
||||
case 0xfe: // CPI byte
|
||||
uint8_t x = state->a - opcode[1];
|
||||
state->cc.z = (x == 0);
|
||||
state->cc.s = (0x80 == (x & 0x80));
|
||||
state->cc.cy = (state->a < opcode[1]);
|
||||
state->cc.p = parity(x, 8);
|
||||
state->pc++;
|
||||
break;
|
||||
|
||||
default: unknownInstruction(state); break;
|
||||
}
|
||||
state->pc+1;
|
||||
}
|
||||
Loading…
Reference in a new issue