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X86-assmebler.cpp
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X86-assmebler.cpp
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#include<bits/stdc++.h>
#include<string>
#include <iostream>
using namespace std;
string binary_to_hexadecimal(int binaryNum)
{
int hex=0, mul=1, chk=1, rem, i=0;
string hexDecNum = "";
for(int j = 0; j < (to_string(binaryNum)).length() / 4; j++)
hexDecNum+= " ";
while(binaryNum!=0)
{
rem = binaryNum%10;
hex = hex + (rem*mul);
if(chk%4==0)
{
if(hex<10)
hexDecNum[i] = hex+48;
else
hexDecNum[i] = hex+55;
mul = 1;
hex = 0;
chk = 1;
i++;
}
else
{
mul = mul*2;
chk++;
}
binaryNum = binaryNum/10;
}
if(chk!=1)
hexDecNum[i] = hex+48;
if(chk==1)
i--;
reverse(hexDecNum.begin(), hexDecNum.end());
return hexDecNum;
}
string find_reg(string reg){
if(reg == "al" || reg == "ax" || reg == "eax")
return "000";
else if(reg == "cl" || reg == "cx" || reg == "ecx")
return "001";
else if(reg == "dl" || reg == "dx" || reg == "edx")
return "010";
else if(reg == "bl" || reg == "bx" || reg == "ebx")
return "011";
else if(reg == "ah" || reg == "sp" || reg == "esp")
return "100";
else if(reg == "ch" || reg == "bp" || reg == "ebp")
return "101";
else if(reg == "dh" || reg == "si" || reg == "esi")
return "110";
else if(reg == "bh" || reg == "di" || reg == "edi")
return "111";
}
string add(string operand1, string operand2){
string opcode;
if(operand1[1] == 'h' || operand1[1] == 'l') // reg8
opcode = "02";
else // reg16/32
opcode = "03";
return opcode;
}
string sub(string operand1, string operand2){
string opcode;
if(operand1[1] == 'h' || operand1[1] == 'l') // reg8
opcode = "2A";
else // reg16/32
opcode = "2B";
return opcode;
}
string Or(string operand1, string operand2){
string opcode;
if(operand1[1] == 'h' || operand1[1] == 'l') // reg8
opcode = "0A";
else // reg16/32
opcode = "0B";
return opcode;
}
string And(string operand1, string operand2){
string opcode;
if(operand1[1] == 'h' || operand1[1] == 'l') // reg8
opcode = "22";
else // reg16/32
opcode = "23";
return opcode;
}
string assemble(string operation ,string operand1, string operand2){
string ans = "";
string secondbyte = "11" + find_reg(operand1) + find_reg(operand2);
int binary_num = stoi(secondbyte);
if(operation == "add"){
ans += add(operand1, operand2);
}
else if(operation == "sub"){
ans += sub(operand1, operand2);
}
else if(operation == "and"){
ans += And(operand1, operand2);
}
else if(operation == "or"){
ans += Or(operand1, operand2);
}
ans += " " + binary_to_hexadecimal(binary_num);
if(operand1[1] == 'x' || operand1 == "si" || operand1 == "di" || operand1 == "bp" || operand1 == "sp")
ans = "66 "+ ans;
return ans;
}
int main() {
string operation;
string operand1;
string operand2;
cout << "Please Enter your operation: ";
cin >> operation;
cout << "Please Enter your first operand: ";
cin >> operand1;
cout << "Please Enter your second operand: ";
cin >> operand2;
transform(operation.begin(), operation.end(), operation.begin(), ::tolower); // to lowercase
transform(operand1.begin(), operand1.end(), operand1.begin(), ::tolower);
transform(operand2.begin(), operand2.end(), operand2.begin(), ::tolower);
cout << assemble(operation, operand1, operand2);
}