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dasm.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "dasm.h"
#include "global.h"
#include "defs.h"
/* Parse assembly instruction from file stream at current position and return a pointer to the string */
char *parse_instr(long int curaddr) {
BYTE b = fgetc(fin); // Get first byte of instruction
BYTE mod;
BYTE ext;
char *ret = (char *) malloc(64 * sizeof(char)); // Return string
char *op = (char *) malloc(64 * sizeof(char)); // Opcode
char *opa1 = (char *) malloc(64 * sizeof(char)); // Operand
char *opa2 = (char *) malloc(64 * sizeof(char)); // Operand
char *tmp;
WORD w;
DWORD d;
int i;
// DEBUGGING show first byte of instruction
// printf("%.2X\t", b);
switch (b) {
case 0x00: // ADD Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "ADD %s,%s", opa1, opa2);
break;
case 0x01: // ADD Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "ADD %s,%s", opa1, opa2);
break;
case 0x02: // ADD Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "ADD %s,%s", opa1, opa2);
break;
case 0x03: // ADD Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "ADD %s,%s", opa1, opa2);
break;
case 0x04: // ADD AL,Ib
b = fgetc(fin);
sprintf(ret, "ADD AL,%X", b);
break;
case 0x05: // ADD EAX,Iv
d = get_dword();
sprintf(ret, "ADD EAX,%X", d);
break;
case 0x06: // PUSH ES
sprintf(ret, "PUSH ES");
break;
case 0x07: // POP ES
sprintf(ret, "POP ES");
break;
case 0x08: // OR Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "OR %s,%s", opa1, opa2);
break;
case 0x09: // OR Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "OR %s,%s", opa1, opa2);
break;
case 0x0A: // OR Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "OR %s,%s", opa1, opa2);
break;
case 0x0B: // OR Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "OR %s,%s", opa1, opa2);
break;
case 0x0C: // OR AL,Ib
b = fgetc(fin);
sprintf(ret, "OR AL,%X", b);
break;
case 0x0D: // OR EAX,Iv
d = get_dword();
sprintf(ret, "OR EAX,%X", d);
break;
case 0x0E: // PUSH CS
sprintf(ret, "PUSH CS");
break;
case 0x10: // ADC Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "ADC %s,%s", opa1, opa2);
break;
case 0x11: // ADC Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "ADC %s,%s", opa1, opa2);
break;
case 0x12: // ADC Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "ADC %s,%s", opa1, opa2);
break;
case 0x13: // ADC Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "ADC %s,%s", opa1, opa2);
break;
case 0x14: // ADC AL,Ib
b = fgetc(fin);
sprintf(ret, "ADC AL,%X", b);
break;
case 0x15: // ADC EAX,Iv
d = get_dword();
sprintf(ret, "ADC EAX,%X", d);
break;
case 0x16: // PUSH SS
sprintf(ret, "PUSH SS");
break;
case 0x17: // POP SS
sprintf(ret, "POP SS");
break;
case 0x18: // SBB Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "SBB %s,%s", opa1, opa2);
break;
case 0x19: // SBB Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "SBB %s,%s", opa1, opa2);
break;
case 0x1A: // SBB Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "SBB %s,%s", opa1, opa2);
break;
case 0x1B: // SBB Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "SBB %s,%s", opa1, opa2);
break;
case 0x1C: // SBB AL,Ib
b = fgetc(fin);
sprintf(ret, "SBB AL,%X", b);
break;
case 0x1D: // SBB EAX,Iv
d = get_dword();
sprintf(ret, "SBB EAX,%X", d);
break;
case 0x1E: // PUSH DS
sprintf(ret, "PUSH DS");
break;
case 0x1F: // POP DS
sprintf(ret, "POP DS");
break;
case 0x20: // AND Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "AND %s,%s", opa1, opa2);
break;
case 0x21: // AND Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "AND %s,%s", opa1, opa2);
break;
case 0x22: // AND Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "AND %s,%s", opa1, opa2);
break;
case 0x23: // AND Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "AND %s,%s", opa1, opa2);
break;
case 0x24: // AND AL,Ib
b = fgetc(fin);
sprintf(ret, "AND AL,%X", b);
break;
case 0x25: // AND EAX,Iv
d = get_dword();
sprintf(ret, "AND EAX,%X", d);
break;
case 0x26: // SEG=ES
sprintf(ret, "SEG=ES");
break;
case 0x27: // DAA
sprintf(ret, "DAA");
break;
case 0x28: // SUB Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "SUB %s,%s", opa1, opa2);
break;
case 0x29: // SUB Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "SUB %s,%s", opa1, opa2);
break;
case 0x2A: // SUB Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "SUB %s,%s", opa1, opa2);
break;
case 0x2B: // SUB Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "SUB %s,%s", opa1, opa2);
break;
case 0x2C: // SUB AL,Ib
b = fgetc(fin);
sprintf(ret, "SUB AL,%X", b);
break;
case 0x2D: // SUB EAX,Iv
d = get_dword();
sprintf(ret, "SUB EAX,%X", d);
break;
case 0x2E: // SEG=CS
sprintf(ret, "SEG=CS");
break;
case 0x2F: // DAS
sprintf(ret, "DAS");
break;
case 0x30: // XOR Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "XOR %s,%s", opa1, opa2);
break;
case 0x31: // XOR Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "XOR %s,%s", opa1, opa2);
break;
case 0x32: // XOR Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "XOR %s,%s", opa1, opa2);
break;
case 0x33: // XOR Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "XOR %s,%s", opa1, opa2);
break;
case 0x34: // XOR AL,Ib
b = fgetc(fin);
sprintf(ret, "XOR AL,%X", b);
break;
case 0x35: // XOR EAX,Iv
d = get_dword();
sprintf(ret, "XOR EAX,%X", d);
break;
case 0x36: // SEG=SS
sprintf(ret, "SEG=SS");
break;
case 0x37: // AAA
sprintf(ret, "AAA");
break;
case 0x38: // CMP Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "CMP %s,%s", opa1, opa2);
break;
case 0x39: // CMP Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "CMP %s,%s", opa1, opa2);
break;
case 0x3A: // CMP Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "CMP %s,%s", opa1, opa2);
break;
case 0x3B: // CMP Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "CMP %s,%s", opa1, opa2);
break;
case 0x3C: // CMP AL,Ib
b = fgetc(fin);
sprintf(ret, "CMP AL,%X", b);
break;
case 0x3D: // CMP EAX,Iv
d = get_dword();
sprintf(ret, "CMP EAX,%X", d);
break;
case 0x3E: // SEG=DS
sprintf(ret, "SEG=DS");
break;
case 0x3F: // AAS
sprintf(ret, "AAS");
break;
case 0x40: // INC EAX
case 0x41: // INC ECX
case 0x42: // INC EDX
case 0x43: // INC EBX
case 0x44: // INC ESP
case 0x45: // INC EBP
case 0x46: // INC ESI
case 0x47: // INC EDI
sprintf(ret, "INC %s", reg_table(b, 'd')); // Same order as reg table
break;
case 0x48: // DEC EAX
case 0x49: // DEC ECX
case 0x4A: // DEC EDX
case 0x4B: // DEC EBX
case 0x4C: // DEC ESP
case 0x4D: // DEC EBP
case 0x4E: // DEC ESI
case 0x4F: // DEC EDI
sprintf(ret, "DEC %s", reg_table(b, 'd'));
break;
case 0x50: // PUSH EAX
case 0x51: // PUSH ECX
case 0x52: // PUSH EDX
case 0x53: // PUSH EBX
case 0x54: // PUSH ESP
case 0x55: // PUSH EBP
case 0x56: // PUSH ESI
case 0x57: // PUSH EDI
sprintf(ret, "PUSH %s", reg_table(b, 'd'));
break;
case 0x58: // POP EAX
case 0x59: // POP ECX
case 0x5A: // POP EDX
case 0x5B: // POP EBX
case 0x5C: // POP ESP
case 0x5D: // POP EBP
case 0x5E: // POP ESI
case 0x5F: // POP EDI
sprintf(ret, "POP %s", reg_table(b, 'd'));
break;
case 0x60: // PUSHAD
sprintf(ret, "PUSHAD");
break;
case 0x61: // POPAD
sprintf(ret, "POPAD");
break;
case 0x62: // BOUND Gv,Ma
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "BOUND %s,%s", opa1, opa2);
break;
case 0x63: // ARPL Ew,Gw
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'w');
opa2 = parse_modrm(b, 'G', 'w');
sprintf(ret, "ARPL %s,%s", opa1, opa2);
break;
case 0x64: // SEG=FS
sprintf(ret, "SEG=FS");
break;
case 0x65: // SEG=GS
sprintf(ret, "SEG=GS");
break;
case 0x66: // Operand size override
sprintf(ret, "Opd Size 16");
break;
case 0x67: // Address size override
sprintf(ret, "Addr Size 16");
break;
case 0x68: // PUSH Iv
d = get_dword();
sprintf(ret, "PUSH %X", d);
break;
case 0x69: // IMUL Gv,Ev,Iv
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
d = get_dword();
sprintf(ret, "IMUL %s,%s,%X", opa1, opa2, d);
break;
case 0x6A: // PUSH Ib
b = fgetc(fin);
sprintf(ret, "PUSH %s", sign8x(b));
break;
case 0x6B: // IMUL Gv,Ev,Ib
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
b = fgetc(fin);
sprintf(ret, "IMUL %s,%s,%s", opa1, opa2, sign8x(b));
break;
case 0x6C: // INS Yb,DX
sprintf(ret, "INS BYTE PTR ES:[EDI],DX");
break;
case 0x6D: // INS Yv,DX
sprintf(ret, "INS DWORD PTR ES:[EDI],DX");
break;
case 0x6E: // OUTS DX,Xb
sprintf(ret, "OUTS DX,BYTE PTR ES:[EDI]");
break;
case 0x6F: // OUTS DX,Xv
sprintf(ret, "OUTS DX,DWORD PTR ES:[EDI]");
break;
case 0x70: // JO SHORT
b = fgetc(fin);
sprintf(ret, "JO SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x71: // JNO SHORT
b = fgetc(fin);
sprintf(ret, "JNO SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x72: // JB SHORT
b = fgetc(fin);
sprintf(ret, "JB SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x73: // JAE SHORT
b = fgetc(fin);
sprintf(ret, "JAE SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x74: // JE SHORT
b = fgetc(fin);
sprintf(ret, "JE SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x75: // JNE SHORT
b = fgetc(fin);
sprintf(ret, "JNE SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x76: // JBE SHORT
b = fgetc(fin);
sprintf(ret, "JBE SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x77: // JA SHORT
b = fgetc(fin);
sprintf(ret, "JA SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x78: // JS SHORT
b = fgetc(fin);
sprintf(ret, "JS SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x79: // JNS SHORT
b = fgetc(fin);
sprintf(ret, "JNS SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x7A: // JP SHORT
b = fgetc(fin);
sprintf(ret, "JP SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x7B: // JNP SHORT
b = fgetc(fin);
sprintf(ret, "JNP SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x7C: // JL SHORT
b = fgetc(fin);
sprintf(ret, "JL SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x7D: // JGE SHORT
b = fgetc(fin);
sprintf(ret, "JGE SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x7E: // JLE SHORT
b = fgetc(fin);
sprintf(ret, "JLE SHORT %X", curaddr + 2 + (int8_t) b);
break;
case 0x7F: // JG SHORT
b = fgetc(fin);
sprintf(ret, "JG SHORT %X", curaddr + 2 + (int8_t) b);
break;
// Immediate Group 1
case 0x80: // Eb,Ib
b = fgetc(fin);
op = group1_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'b');
b = fgetc(fin);
sprintf(ret, "%s %s,%X", op, opa1, b);
break;
// Immediate Group 1
case 0x81: // Ev,Iv
b = fgetc(fin);
op = group1_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'd');
d = get_dword();
sprintf(ret, "%s %s,%X", op, opa1, d);
break;
// Immediate Group 1
case 0x82: // Ev,Ib
b = fgetc(fin);
op = group1_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'd');
b = fgetc(fin);
sprintf(ret, "%s %s,%s", op, opa1, sign8x(b));
break;
// Immediate Group 1
case 0x83: // Ev,Ib
b = fgetc(fin);
op = group1_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'd');
b = fgetc(fin);
sprintf(ret, "%s %s,%s", op, opa1, sign8x(b));
break;
case 0x84: // TEST Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "TEST %s,%s", opa1, opa2);
break;
case 0x85: // TEST Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "TEST %s,%s", opa1, opa2);
break;
case 0x86: // XCHG Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "XCHG %s,%s", opa1, opa2);
break;
case 0x87: // XCHG Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "XCHG %s,%s", opa1, opa2);
break;
case 0x88: // MOV Eb,Gb
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
opa2 = parse_modrm(b, 'G', 'b');
sprintf(ret, "MOV %s,%s", opa1, opa2);
break;
case 0x89: // MOV Ev,Gv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
opa2 = parse_modrm(b, 'G', 'd');
sprintf(ret, "MOV %s,%s", opa1, opa2);
break;
case 0x8A: // MOV Gb,Eb
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'b');
opa2 = parse_modrm(b, 'E', 'b');
sprintf(ret, "MOV %s,%s", opa1, opa2);
break;
case 0x8B: // MOV Gv,Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "MOV %s,%s", opa1, opa2);
break;
case 0x8C: // MOV Ew,Sw
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'w');
opa2 = segreg_table(get_regop(b));
sprintf(ret, "MOV %s,%s", opa1, opa2);
break;
case 0x8D: // LEA Gv,M
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "LEA %s,%s", opa1, opa2);
break;
case 0x8E: // MOV Sw,Ew
b = fgetc(fin);
opa1 = segreg_table(get_regop(b));
opa2 = parse_modrm(b, 'E', 'w');
sprintf(ret, "MOV %s,%s", opa1, opa2);
break;
case 0x8F: // POP Ev
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
sprintf(ret, "POP %s", opa1);
break;
case 0x90: // NOP
sprintf(ret, "NOP");
break;
// XCHG register with EAX
case 0x91:
case 0x92:
case 0x93:
case 0x94:
case 0x95:
case 0x96:
case 0x97:
sprintf(ret, "XCHG EAX,%s", reg_table(b, 'd'));
break;
case 0x98: // CWDE
sprintf(ret, "CWDE");
break;
case 0x99: // CDQ
sprintf(ret, "CDQ");
break;
case 0x9A: // CALLF Ap
d = get_dword();
w = get_word();
sprintf(ret, "CALL FAR %X:%X", w, d);
break;
case 0x9B: // WAIT
sprintf(ret, "WAIT");
break;
case 0x9C: // PUSHFD
sprintf(ret, "PUSHFD");
break;
case 0x9D: // POPFD
sprintf(ret, "POPFD");
break;
case 0x9E: // SAHF
sprintf(ret, "SAHF");
break;
case 0x9F: // LAHF
sprintf(ret, "LAHF");
break;
case 0xA0: // MOV AL,Ob
d = get_dword();
sprintf(ret, "MOV AL,BYTE PTR [%X]", d);
break;
case 0xA1: // MOV EAX,Ov
d = get_dword();
sprintf(ret, "MOV EAX,DWORD PTR [%X]", d);
break;
case 0xA2: // MOV Ob,AL
d = get_dword();
sprintf(ret, "MOV BYTE PTR [%X],AL", d);
break;
case 0xA3: // MOV Ov,EAX
d = get_dword();
sprintf(ret, "MOV DWORD PTR [%X],EAX", d);
break;
case 0xA4: // MOVS Xb,Yb
sprintf(ret, "MOVS BYTE PTR [ESI],BYTE PTR [EDI]");
break;
case 0xA5: // MOVS Xv,Yv
sprintf(ret, "MOVS DWORD PTR [ESI],DWORD PTR [EDI]");
break;
case 0xA6: // CMPS Xb,Yb
sprintf(ret, "CMPS BYTE PTR [ESI],BYTE PTR [EDI]");
break;
case 0xA7: // CMPS Xv,Yv
sprintf(ret, "CMPS DWORD PTR [ESI],DWORD PTR [EDI]");
break;
case 0xA8: // TEST AL,Ib
b = fgetc(fin);
sprintf(ret, "TEST AL,%X", b);
break;
case 0xA9: // TEST EAX,Iv
d = get_dword();
sprintf(ret, "TEST EAX,%X", d);
break;
case 0xAA: // STOS Yb,AL
sprintf(ret, "STOS BYTE PTR [EDI],AL");
break;
case 0xAB: // STOS Yv,EAX
sprintf(ret, "STOS BYTE PTR [EDI],EAX");
break;
case 0xAC: // LODS AL,Xb
sprintf(ret, "LODS AL,BYTE PTR [ESI]");
break;
case 0xAD: // LODS EAX,Xv
sprintf(ret, "LODS EAX,DWORD PTR [ESI]");
break;
case 0xAE: // SCAS AL,Yb
sprintf(ret, "SCAS AL,BYTE PTR [EDI]");
break;
case 0xAF: // SCAS EAX,Xv
sprintf(ret, "LODS EAX,DWORD PTR [ESI]");
break;
case 0xB0: // MOV AL,Ib
case 0xB1: // MOV CL,Ib
case 0xB2: // MOV DL,Ib
case 0xB3: // MOV BL,Ib
case 0xB4: // MOV AH,Ib
case 0xB5: // MOV CH,Ib
case 0xB6: // MOV DH,Ib
case 0xB7: // MOV BH,Ib
opa1 = reg_table(b, 'b');
b = fgetc(fin);
sprintf(ret, "MOV %s,%X", opa1, b);
break;
case 0xB8: // MOV EAX,Iv
case 0xB9: // MOV ECX,Iv
case 0xBA: // MOV EDX,Iv
case 0xBB: // MOV EBX,Iv
case 0xBC: // MOV ESP,Iv
case 0xBD: // MOV EBP,Iv
case 0xBE: // MOV ESI,Iv
case 0xBF: // MOV EDI,Iv
opa1 = reg_table(b, 'd');
d = get_dword();
sprintf(ret, "MOV %s,%X", opa1, d);
break;
// Shift Group 2
case 0xC0: // Eb,Ib
b = fgetc(fin);
op = group2_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'b');
b = fgetc(fin);
sprintf(ret, "%s %s,%X", op, opa1, b);
break;
// Shift Group 2
case 0xC1: // Ev,Ib
b = fgetc(fin);
op = group2_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'v');
b = fgetc(fin);
sprintf(ret, "%s %s,%X", op, opa1, b);
break;
case 0xC2: // RETN Iw
w = get_word();
sprintf(ret, "RETN %X", w);
break;
case 0xC3: // RETN
sprintf(ret, "RETN");
break;
case 0xC4: // LES Gv,Mp
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "LES %s,%s", opa1, opa2);
break;
case 0xC5: // LDS Gv,Mp
b = fgetc(fin);
opa1 = parse_modrm(b, 'G', 'd');
opa2 = parse_modrm(b, 'E', 'd');
sprintf(ret, "LDS %s,%s", opa1, opa2);
break;
// Group 11
case 0xC6: // MOV Eb,Ib
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'b');
b = fgetc(fin);
sprintf(ret, "MOV %s,%X", opa1, b);
break;
// Group 11
case 0xC7: // MOV Ev,Iv
b = fgetc(fin);
opa1 = parse_modrm(b, 'E', 'd');
d = get_dword();
sprintf(ret, "MOV %s,%X", opa1, d);
break;
case 0xC8: // ENTER Iw,Ib
w = get_word();
b = fgetc(fin);
sprintf(ret, "ENTER %X,%X", w, b);
break;
case 0xC9: // LEAVE
sprintf(ret, "LEAVE");
break;
case 0xCA: // RETF Iw
w = get_word();
sprintf(ret, "RETF %X", w);
break;
case 0xCB: // RETF
sprintf(ret, "RETF");
break;
case 0xCC: // INT 3
sprintf(ret, "INT 3");
break;
case 0xCD: // INT Ib
b = fgetc(fin);
sprintf(ret, "INT %X", b);
break;
case 0xCE: // INTO
sprintf(ret, "INTO");
break;
case 0xCF: // IRET
sprintf(ret, "IRET");
break;
// Shift Group 2
case 0xD0: // Eb,1
b = fgetc(fin);
op = group2_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'b');
sprintf(ret, "%s %s,1", op, opa1);
break;
// Shift Group 2
case 0xD1: // Ev,1
b = fgetc(fin);
op = group2_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'd');
sprintf(ret, "%s %s,1", op, opa1);
break;
// Shift Group 2
case 0xD2: // Eb,CL
b = fgetc(fin);
op = group2_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'b');
sprintf(ret, "%s %s,CL", op, opa1);
break;
// Shift Group 2
case 0xD3: // Ev,CL
b = fgetc(fin);
op = group2_op(get_regop(b));
opa1 = parse_modrm(b, 'E', 'd');
sprintf(ret, "%s %s,CL", op, opa1);
break;
case 0xD4: // AAM Ib
b = fgetc(fin);
sprintf(ret, "AAM %X", b);
break;
case 0xD5: // AAD Ib
b = fgetc(fin);
sprintf(ret, "AAD %X", b);
break;
case 0xD6: // None
sprintf(ret, "OPCERR");
break;
case 0xD7: // XLAT