declutter main.rs
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use std::{fs, env};
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use std::{fs, env};
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use instructions::arithmetic;
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use instructions::arithmetic;
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use crate::structs::*;
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mod instructions;
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mod instructions;
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mod structs;
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const MEMORY_SIZE: usize = 8192;
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pub const MEMORY_SIZE: usize = 8192;
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pub struct EmulatorState {
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a: u8,
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b: u8,
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c: u8,
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d: u8,
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e: u8,
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h: u8,
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l: u8,
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cc: ConditionCodes,
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/// Stack pointer
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sp: u16,
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/// Memory pointer
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pc: u16,
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/// Enable interrupts
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ei: bool,
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/// Memory map
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memory: [u8; MEMORY_SIZE],
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}
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pub struct ConditionCodes {
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/// Zero (Z), set if the result is zero.
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z: bool,
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/// Sign (S), set if the result is negative.
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s: bool,
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/// Parity (P), set if the number of 1 bits in the result is even.
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p: bool,
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/// Carry (C), set if the last addition operation resulted in a carry or if the last subtraction operation required a borrow.
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c: bool,
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// Auxiliary carry (AC or H), used for binary-coded decimal arithmetic (BCD).
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// Can't test this so I won't implement it
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// ac: bool,
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}
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#[derive(PartialEq)]
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#[derive(Debug)]
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pub enum Register {
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B, C, D, E,
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H, L, M, A,
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SP,
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}
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/// Returns a Register enum based on the input number 0..7 in the order B,C,D,E,H,L,M,A
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fn register_from_num(b: u8) -> Register {
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match b {
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0 => Register::B,
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1 => Register::C,
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2 => Register::D,
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3 => Register::E,
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4 => Register::H,
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5 => Register::L,
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6 => Register::M,
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7 => Register::A,
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_ => panic!("'{b}' cannot be converted to register enum"),
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}
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}
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fn get_register(register: Register, state: &EmulatorState) -> u8 {
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match register {
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Register::B => state.b as u8,
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Register::C => state.c as u8,
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Register::D => state.d as u8,
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Register::E => state.e as u8,
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Register::H => state.h as u8,
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Register::L => state.l as u8,
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Register::A => state.a as u8,
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Register::M => state.memory[u16::from_le_bytes([state.l, state.h]) as usize],
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Register::SP => unreachable!(),
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}
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}
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fn set_register(register: Register, value: u8, state: &mut EmulatorState) {
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match register {
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Register::B => state.b = value,
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Register::C => state.c = value,
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Register::D => state.d = value,
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Register::E => state.e = value,
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Register::H => state.h = value,
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Register::L => state.l = value,
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Register::A => state.a = value,
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Register::M => state.memory[u16::from_le_bytes([state.l, state.h]) as usize] = value,
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Register::SP => panic!("Cannot set 'SP' through set_register()"),
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};
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}
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/// Print values of registers and flags to stdout
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fn print_state(state: &EmulatorState) {
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// State
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println!("\nsp\tpc\tei");
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println!("{:#06x}\t{:#06x}\t{}", state.sp, state.pc, state.ei);
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// Registers
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println!("\nB\tC\tD\tE\tH\tL\tA");
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println!("{:#04x}\t{:#04x}\t{:#04x}\t{:#04x}\t{:#04x}\t{:#04x}\t{:#04x}",
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state.b, state.c, state.d, state.e, state.h, state.l, state.a);
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// Flags
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println!("\nz\ts\tp\tc");
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println!("{}\t{}\t{}\t{}", state.cc.z, state.cc.s, state.cc.p, state.cc.c);
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}
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fn main() {
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fn main() {
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let mut state = EmulatorState {
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let mut state = EmulatorState {
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103
src/emulator/structs.rs
Normal file
103
src/emulator/structs.rs
Normal file
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@ -0,0 +1,103 @@
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use crate::MEMORY_SIZE;
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pub struct EmulatorState {
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pub a: u8,
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pub b: u8,
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pub c: u8,
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pub d: u8,
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pub e: u8,
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pub h: u8,
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pub l: u8,
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pub cc: ConditionCodes,
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/// Stack pointer
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pub sp: u16,
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/// Memory pointer
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pub pc: u16,
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/// Enable interrupts
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pub ei: bool,
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/// Memory map
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pub memory: [u8; MEMORY_SIZE],
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}
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pub struct ConditionCodes {
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/// Zero (Z), set if the result is zero.
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pub z: bool,
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/// Sign (S), set if the result is negative.
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pub s: bool,
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/// Parity (P), set if the number of 1 bits in the result is even.
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pub p: bool,
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/// Carry (C), set if the last addition operation resulted in a carry or if the last subtraction operation required a borrow.
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pub c: bool,
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// Auxiliary carry (AC or H), used for binary-coded decimal arithmetic (BCD).
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// Can't test this so I won't implement it
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// ac: bool,
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}
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#[derive(PartialEq)]
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#[derive(Debug)]
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pub enum Register {
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B, C, D, E,
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H, L, M, A,
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SP,
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}
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/// Returns a Register enum based on the input number 0..7 in the order B,C,D,E,H,L,M,A
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pub fn register_from_num(b: u8) -> Register {
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match b {
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0 => Register::B,
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1 => Register::C,
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2 => Register::D,
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3 => Register::E,
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4 => Register::H,
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5 => Register::L,
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6 => Register::M,
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7 => Register::A,
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_ => panic!("'{b}' cannot be converted to register enum"),
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}
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}
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pub fn get_register(register: Register, state: &EmulatorState) -> u8 {
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match register {
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Register::B => state.b as u8,
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Register::C => state.c as u8,
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Register::D => state.d as u8,
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Register::E => state.e as u8,
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Register::H => state.h as u8,
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Register::L => state.l as u8,
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Register::A => state.a as u8,
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Register::M => state.memory[u16::from_le_bytes([state.l, state.h]) as usize],
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Register::SP => unreachable!(),
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}
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}
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pub fn set_register(register: Register, value: u8, state: &mut EmulatorState) {
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match register {
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Register::B => state.b = value,
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Register::C => state.c = value,
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Register::D => state.d = value,
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Register::E => state.e = value,
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Register::H => state.h = value,
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Register::L => state.l = value,
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Register::A => state.a = value,
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Register::M => state.memory[u16::from_le_bytes([state.l, state.h]) as usize] = value,
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Register::SP => panic!("Cannot set 'SP' through set_register()"),
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};
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}
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/// Print values of registers and flags to stdout
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pub fn print_state(state: &EmulatorState) {
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// State
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println!("\nsp\tpc\tei");
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println!("{:#06x}\t{:#06x}\t{}", state.sp, state.pc, state.ei);
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// Registers
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println!("\nB\tC\tD\tE\tH\tL\tA");
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println!("{:#04x}\t{:#04x}\t{:#04x}\t{:#04x}\t{:#04x}\t{:#04x}\t{:#04x}",
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state.b, state.c, state.d, state.e, state.h, state.l, state.a);
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// Flags
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println!("\nz\ts\tp\tc");
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println!("{}\t{}\t{}\t{}", state.cc.z, state.cc.s, state.cc.p, state.cc.c);
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}
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