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mod cpu;
mod instructions;
mod memory;
use cpu::CPU;
use memory::Memory;
use instructions::Instruction;
fn main() {
let mut cpu = CPU::default();
let mut mem = Memory::new();
// a = 10
mem.write(0x0000, Instruction::MOV as u8);
mem.write(0x0001, 0);
mem.write(0x0002, 5);
// b = 2
mem.write(0x0003, Instruction::MOV as u8);
mem.write(0x0004, 1);
mem.write(0x0005, 3);
// a = a + b
mem.write(0x0006, Instruction::SUB as u8);
mem.write(0x0007, 0);
mem.write(0x0008, 1);
// JMP to halt
mem.write(0x0009, Instruction::JNZ as u8);
mem.write(0x000a, 0x0f); // Low
mem.write(0x000b, 0x00); // High
// set b = 0
mem.write(0x000c, Instruction::MOV as u8);
mem.write(0x000d, 1);
mem.write(0x000e, 0);
// halt
mem.write(0x000f, Instruction::HLT as u8);
while !cpu.halted {
let opcode = mem.read(cpu.pc);
cpu.inc_pc();
match opcode {
x if x == Instruction::MOV as u8 => cpu.mov(&mut mem),
x if x == Instruction::ADD as u8 => cpu.add(&mut mem),
x if x == Instruction::SUB as u8 => cpu.sub(&mut mem),
x if x == Instruction::JMP as u8 => cpu.jmp(&mut mem),
x if x == Instruction::JZ as u8 => cpu.jz(&mut mem),
x if x == Instruction::JNZ as u8 => cpu.jnz(&mut mem),
x if x == Instruction::HLT as u8 => cpu.halt(),
_ => panic!("Unknown opcode {:02X}", opcode),
}
}
println!("{:#?}", cpu);
}
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