2023-01-16 19:28:03 +11:00
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use std::ops::{BitAnd, BitOr, BitXor};
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2023-01-16 12:13:53 +11:00
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use crate::{Inner, Memory, Register, State};
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2023-01-16 14:23:43 +11:00
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#[allow(dead_code)]
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2023-01-16 14:23:06 +11:00
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enum FLAGS {
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Z = 7,
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N = 6,
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H = 5,
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C = 4,
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}
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2023-01-16 12:13:53 +11:00
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pub struct CPU {
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pub memory: Memory,
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pub state: State,
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}
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impl CPU {
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pub fn exec_next(&mut self) -> u8 {
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let opcode = self.next_opcode();
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2023-01-16 19:28:03 +11:00
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unsafe { println!("exec {:#4X} from {:#4X}", opcode, self.state.pc.as_u16 - 1) };
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match opcode {
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0x0 => {
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// noop
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}
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2023-01-16 14:23:06 +11:00
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0x01 => self.state.bc = self.ld_immediate_word(),
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0x02 => unsafe {
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let address = self.state.bc.as_u16;
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self.memory.set(address, self.state.af.as_u8s.left);
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},
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2023-01-16 19:28:03 +11:00
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0x03 => unsafe { self.state.bc.as_u16 = self.state.bc.as_u16.wrapping_add(1) },
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0x04 => unsafe {
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self.state.bc.as_u8s.left = self.state.bc.as_u8s.left.wrapping_add(1)
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},
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0x05 => unsafe {
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self.state.bc.as_u8s.left = self.state.bc.as_u8s.left.wrapping_sub(1)
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},
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0x06 => self.state.bc.as_u8s.left = self.ld_immediate_byte(),
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0x07 => panic!("RCLA instruction: 0x07"),
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0x08 => unsafe {
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let address = self.ld_immediate_word().as_u16;
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let word = self.state.sp;
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self.store_word(address, word);
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},
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2023-01-16 19:28:03 +11:00
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0x09 => unsafe {
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self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(self.state.bc.as_u16)
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},
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0x0A => unsafe { self.state.af.as_u8s.left = self.memory.get(self.state.bc.as_u16) },
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2023-01-16 19:28:03 +11:00
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0x0B => unsafe { self.state.bc.as_u16 = self.state.bc.as_u16.wrapping_sub(0x1) },
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0x0C => unsafe {
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self.state.bc.as_u8s.right = self.state.bc.as_u8s.right.wrapping_add(0x1)
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},
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0x0D => unsafe {
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self.state.bc.as_u8s.right = self.state.bc.as_u8s.right.wrapping_sub(0x1)
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},
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2023-01-16 14:23:06 +11:00
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0x0E => self.state.bc.as_u8s.right = self.ld_immediate_byte(),
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0x0F => panic!("RRCA instruction: 0x0F"),
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0x10 => panic!("STOP instruction"),
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0x11 => self.state.de = self.ld_immediate_word(),
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0x12 => unsafe {
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let address = self.state.de.as_u16;
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let data = self.state.af.as_u8s.left;
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self.memory.set(address, data);
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},
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2023-01-16 19:28:03 +11:00
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0x13 => unsafe { self.state.de.as_u16 = self.state.de.as_u16.wrapping_sub(0x1) },
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0x14 => unsafe {
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self.state.de.as_u8s.left = self.state.de.as_u8s.left.wrapping_add(0x1)
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},
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0x15 => unsafe {
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self.state.de.as_u8s.left = self.state.de.as_u8s.left.wrapping_sub(0x1)
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},
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2023-01-16 14:23:06 +11:00
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0x16 => self.state.de.as_u8s.left = self.ld_immediate_byte(),
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0x17 => panic!("RLA instruction: 0x17"),
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0x18 => unsafe {
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self.state.pc.as_u16 = self
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.state
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.pc
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.as_u16
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.wrapping_add(self.ld_immediate_byte() as u16)
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},
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0x19 => unsafe {
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self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(self.state.de.as_u16)
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},
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2023-01-16 14:23:06 +11:00
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0x1A => unsafe { self.state.af.as_u8s.left = self.memory.get(self.state.de.as_u16) },
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0x1B => unsafe { self.state.de.as_u16 = self.state.de.as_u16.wrapping_sub(1) },
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0x1C => unsafe {
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self.state.de.as_u8s.right = self.state.de.as_u8s.right.wrapping_add(1)
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},
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0x1D => unsafe {
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self.state.de.as_u8s.right = self.state.de.as_u8s.right.wrapping_sub(1)
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},
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2023-01-16 14:23:06 +11:00
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0x1E => self.state.de.as_u8s.right = self.ld_immediate_byte(),
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0x1F => panic!("RRA instruction: 0x1F"),
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0x20 => {
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let jump_size = self.ld_immediate_byte();
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if self.get_flag(FLAGS::Z) == 0 {
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2023-01-16 19:28:03 +11:00
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unsafe {
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self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(jump_size as u16)
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}
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}
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}
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0x21 => self.state.hl = self.ld_immediate_word(),
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0x22 => unsafe {
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self.memory
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.set(self.state.hl.as_u16, self.state.af.as_u8s.left);
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2023-01-16 19:28:03 +11:00
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self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(1);
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},
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0x23 => unsafe { self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(1) },
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0x24 => unsafe {
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self.state.hl.as_u8s.left = self.state.hl.as_u8s.left.wrapping_add(1)
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},
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0x25 => unsafe {
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self.state.hl.as_u8s.left = self.state.hl.as_u8s.left.wrapping_sub(1)
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2023-01-16 14:23:06 +11:00
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},
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2023-01-16 14:43:27 +11:00
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0x26 => self.state.hl.as_u8s.left = self.ld_immediate_byte(),
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0x27 => panic!("DAA instruction: 0x27"),
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0x28 => {
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let jump_size = self.ld_immediate_byte();
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if self.get_flag(FLAGS::Z) == 1 {
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unsafe {
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self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(jump_size as u16)
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}
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}
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}
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0x29 => unsafe { self.state.hl.as_u16 *= 2 },
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0x2A => unsafe {
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self.state.af.as_u8s.left = self.memory.get(self.state.hl.as_u16);
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self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(1);
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},
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0x2B => unsafe { self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_sub(1) },
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0x2C => unsafe {
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self.state.hl.as_u8s.right = self.state.hl.as_u8s.right.wrapping_add(1)
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},
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0x2D => unsafe {
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self.state.hl.as_u8s.right = self.state.hl.as_u8s.right.wrapping_sub(1)
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},
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0x2E => self.state.hl.as_u8s.right = self.ld_immediate_byte(),
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0x2F => unsafe { self.state.af.as_u8s.left = !self.state.af.as_u8s.left },
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0x30 => {
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let jump_size = self.ld_immediate_byte();
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if self.get_flag(FLAGS::C) == 0 {
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unsafe {
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self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(jump_size as u16)
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}
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2023-01-16 14:43:27 +11:00
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}
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}
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2023-01-16 14:43:27 +11:00
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0x31 => self.state.sp = self.ld_immediate_word(),
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0x32 => unsafe {
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self.memory
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.set(self.state.hl.as_u16, self.state.af.as_u8s.left);
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self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_sub(1);
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},
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0x33 => unsafe { self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_add(1) },
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2023-01-16 14:43:27 +11:00
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0x34 => unsafe {
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let address = self.state.hl.as_u16;
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let data = self.memory.get(address) + 1;
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self.memory.set(address, data);
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},
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0x35 => unsafe {
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let address = self.state.hl.as_u16;
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let data = self.memory.get(address) - 1;
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self.memory.set(address, data);
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},
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0x36 => unsafe {
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let data = self.ld_immediate_byte();
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self.memory.set(self.state.hl.as_u16, data);
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},
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2023-01-16 19:28:03 +11:00
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0x37 => self.set_flag(FLAGS::C),
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0x38 => {
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let jump_size = self.ld_immediate_byte();
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if self.get_flag(FLAGS::C) == 1 {
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unsafe {
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self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(jump_size as u16)
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}
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2023-01-16 14:43:27 +11:00
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}
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}
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2023-01-16 19:28:03 +11:00
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0x39 => unsafe {
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self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(self.state.sp.as_u16)
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},
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2023-01-16 14:43:27 +11:00
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0x3A => unsafe {
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self.state.af.as_u8s.left = self.memory.get(self.state.hl.as_u16);
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self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_sub(1);
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},
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0x3B => unsafe { self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_sub(1) },
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0x3C => unsafe {
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self.state.af.as_u8s.left = self.state.af.as_u8s.left.wrapping_add(1)
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},
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0x3D => unsafe {
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self.state.af.as_u8s.left = self.state.af.as_u8s.left.wrapping_sub(1)
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2023-01-16 14:43:27 +11:00
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},
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0x3E => self.state.af.as_u8s.left = self.ld_immediate_byte(),
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0x3F => self.toggle_flag(FLAGS::C),
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0x40 => {}
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0x41 => unsafe { self.state.bc.as_u8s.left = self.state.bc.as_u8s.right },
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0x42 => unsafe { self.state.bc.as_u8s.left = self.state.de.as_u8s.left },
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0x43 => unsafe { self.state.bc.as_u8s.left = self.state.de.as_u8s.right },
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0x44 => unsafe { self.state.bc.as_u8s.left = self.state.hl.as_u8s.left },
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0x45 => unsafe { self.state.bc.as_u8s.left = self.state.hl.as_u8s.right },
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0x46 => unsafe { self.state.bc.as_u8s.left = self.memory.get(self.state.hl.as_u16) },
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0x47 => unsafe { self.state.bc.as_u8s.left = self.state.af.as_u8s.left },
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0x48 => unsafe { self.state.bc.as_u8s.right = self.state.bc.as_u8s.left },
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0x49 => {}
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0x4A => unsafe { self.state.bc.as_u8s.right = self.state.de.as_u8s.left },
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0x4B => unsafe { self.state.bc.as_u8s.right = self.state.de.as_u8s.right },
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0x4C => unsafe { self.state.bc.as_u8s.right = self.state.hl.as_u8s.left },
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0x4D => unsafe { self.state.bc.as_u8s.right = self.state.hl.as_u8s.right },
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0x4E => unsafe { self.state.bc.as_u8s.right = self.memory.get(self.state.hl.as_u16) },
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0x4F => unsafe { self.state.bc.as_u8s.right = self.state.af.as_u8s.left },
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0x50 => unsafe { self.state.de.as_u8s.left = self.state.bc.as_u8s.left },
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0x51 => unsafe { self.state.de.as_u8s.left = self.state.bc.as_u8s.right },
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0x52 => {}
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0x53 => unsafe { self.state.de.as_u8s.left = self.state.de.as_u8s.right },
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0x54 => unsafe { self.state.de.as_u8s.left = self.state.hl.as_u8s.left },
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0x55 => unsafe { self.state.de.as_u8s.left = self.state.hl.as_u8s.right },
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0x56 => unsafe { self.state.de.as_u8s.left = self.memory.get(self.state.hl.as_u16) },
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0x57 => unsafe { self.state.de.as_u8s.left = self.state.af.as_u8s.left },
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0x58 => unsafe { self.state.de.as_u8s.right = self.state.bc.as_u8s.left },
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0x59 => unsafe { self.state.de.as_u8s.right = self.state.bc.as_u8s.right },
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0x5A => unsafe { self.state.de.as_u8s.right = self.state.de.as_u8s.left },
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0x5B => {}
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0x5C => unsafe { self.state.de.as_u8s.right = self.state.hl.as_u8s.left },
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0x5D => unsafe { self.state.de.as_u8s.right = self.state.hl.as_u8s.right },
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0x5E => unsafe { self.state.de.as_u8s.right = self.memory.get(self.state.hl.as_u16) },
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0x5F => unsafe { self.state.de.as_u8s.right = self.state.af.as_u8s.left },
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0x60 => unsafe { self.state.hl.as_u8s.left = self.state.bc.as_u8s.left },
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0x61 => unsafe { self.state.hl.as_u8s.left = self.state.bc.as_u8s.right },
|
|
|
|
|
0x62 => unsafe { self.state.hl.as_u8s.left = self.state.de.as_u8s.left },
|
|
|
|
|
0x63 => unsafe { self.state.hl.as_u8s.left = self.state.de.as_u8s.right },
|
|
|
|
|
0x64 => {}
|
|
|
|
|
0x65 => unsafe { self.state.hl.as_u8s.left = self.state.hl.as_u8s.right },
|
|
|
|
|
0x66 => unsafe { self.state.hl.as_u8s.left = self.memory.get(self.state.hl.as_u16) },
|
|
|
|
|
0x67 => unsafe { self.state.hl.as_u8s.left = self.state.af.as_u8s.left },
|
|
|
|
|
0x68 => unsafe { self.state.hl.as_u8s.right = self.state.bc.as_u8s.left },
|
|
|
|
|
0x69 => unsafe { self.state.hl.as_u8s.right = self.state.bc.as_u8s.right },
|
|
|
|
|
0x6A => unsafe { self.state.hl.as_u8s.right = self.state.de.as_u8s.left },
|
|
|
|
|
0x6B => unsafe { self.state.hl.as_u8s.right = self.state.de.as_u8s.right },
|
|
|
|
|
0x6C => unsafe { self.state.hl.as_u8s.right = self.state.hl.as_u8s.left },
|
|
|
|
|
0x6D => {}
|
|
|
|
|
0x6E => unsafe { self.state.hl.as_u8s.right = self.memory.get(self.state.hl.as_u16) },
|
|
|
|
|
0x6F => unsafe { self.state.hl.as_u8s.right = self.state.af.as_u8s.left },
|
|
|
|
|
0x70 => unsafe {
|
|
|
|
|
self.memory
|
|
|
|
|
.set(self.state.hl.as_u16, self.state.bc.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x71 => unsafe {
|
|
|
|
|
self.memory
|
|
|
|
|
.set(self.state.hl.as_u16, self.state.bc.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x72 => unsafe {
|
|
|
|
|
self.memory
|
|
|
|
|
.set(self.state.hl.as_u16, self.state.de.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x73 => unsafe {
|
|
|
|
|
self.memory
|
|
|
|
|
.set(self.state.hl.as_u16, self.state.de.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x74 => unsafe {
|
|
|
|
|
self.memory
|
|
|
|
|
.set(self.state.hl.as_u16, self.state.hl.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x75 => unsafe {
|
|
|
|
|
self.memory
|
|
|
|
|
.set(self.state.hl.as_u16, self.state.hl.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x76 => panic!("HALT instruction: 0x76"),
|
|
|
|
|
0x77 => unsafe {
|
|
|
|
|
self.memory
|
|
|
|
|
.set(self.state.hl.as_u16, self.state.af.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x78 => unsafe { self.state.af.as_u8s.left = self.state.bc.as_u8s.left },
|
|
|
|
|
0x79 => unsafe { self.state.af.as_u8s.left = self.state.bc.as_u8s.right },
|
|
|
|
|
0x7A => unsafe { self.state.af.as_u8s.left = self.state.de.as_u8s.left },
|
|
|
|
|
0x7B => unsafe { self.state.af.as_u8s.left = self.state.de.as_u8s.right },
|
|
|
|
|
0x7C => unsafe { self.state.af.as_u8s.left = self.state.hl.as_u8s.left },
|
|
|
|
|
0x7D => unsafe { self.state.af.as_u8s.left = self.state.hl.as_u8s.right },
|
|
|
|
|
0x7E => unsafe { self.state.af.as_u8s.left = self.memory.get(self.state.hl.as_u16) },
|
|
|
|
|
0x7F => {}
|
|
|
|
|
0x80 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.bc.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x81 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.bc.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x82 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.de.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x83 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.de.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x84 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.hl.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x85 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.hl.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x86 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.memory.get(self.state.hl.as_u16))
|
|
|
|
|
},
|
|
|
|
|
0x87 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.af.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x88 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.bc.as_u8s.left + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x89 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.bc.as_u8s.right + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x8A => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.de.as_u8s.left + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x8B => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.de.as_u8s.right + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x8C => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.hl.as_u8s.left + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x8D => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.hl.as_u8s.right + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x8E => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.wrapping_add(
|
|
|
|
|
self.memory.get(self.state.hl.as_u16) + self.get_flag(FLAGS::C),
|
|
|
|
|
)
|
|
|
|
|
},
|
|
|
|
|
0x8F => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.state.af.as_u8s.left + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x90 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.bc.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x91 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.bc.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x92 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.de.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x93 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.de.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x94 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.hl.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x95 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.hl.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0x96 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.memory.get(self.state.hl.as_u16))
|
|
|
|
|
},
|
|
|
|
|
0x97 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.af.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0x98 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.bc.as_u8s.left + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x99 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.bc.as_u8s.right + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x9A => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.de.as_u8s.left + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x9B => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.de.as_u8s.right + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x9C => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.hl.as_u8s.left + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x9D => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.hl.as_u8s.right + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0x9E => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.wrapping_sub(
|
|
|
|
|
self.memory.get(self.state.hl.as_u16) + self.get_flag(FLAGS::C),
|
|
|
|
|
)
|
|
|
|
|
},
|
|
|
|
|
0x9F => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_sub(self.state.af.as_u8s.left + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0xA0 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitand(self.state.bc.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xA1 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitand(self.state.bc.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xA2 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitand(self.state.de.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xA3 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitand(self.state.de.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xA4 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitand(self.state.hl.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xA5 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitand(self.state.hl.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xA6 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.bitand(self.memory.get(self.state.hl.as_u16))
|
|
|
|
|
},
|
|
|
|
|
0xA7 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitand(self.state.af.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xA8 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitxor(self.state.bc.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xA9 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitxor(self.state.bc.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xAA => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitxor(self.state.de.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xAB => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitxor(self.state.de.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xAC => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitxor(self.state.hl.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xAD => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitxor(self.state.hl.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xAE => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.bitxor(self.memory.get(self.state.hl.as_u16))
|
|
|
|
|
},
|
|
|
|
|
0xAF => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitxor(self.state.af.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xB0 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitor(self.state.bc.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xB1 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitor(self.state.bc.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xB2 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitor(self.state.de.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xB3 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitor(self.state.de.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xB4 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitor(self.state.hl.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xB5 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitor(self.state.hl.as_u8s.right)
|
|
|
|
|
},
|
|
|
|
|
0xB6 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.bitor(self.memory.get(self.state.hl.as_u16))
|
|
|
|
|
},
|
|
|
|
|
0xB7 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left =
|
|
|
|
|
self.state.af.as_u8s.left.bitor(self.state.af.as_u8s.left)
|
|
|
|
|
},
|
|
|
|
|
0xB8 => unsafe {
|
|
|
|
|
if self.state.af.as_u8s.left == self.state.bc.as_u8s.left {
|
|
|
|
|
self.set_flag(FLAGS::Z);
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
0xB9 => unsafe {
|
|
|
|
|
if self.state.af.as_u8s.left == self.state.bc.as_u8s.right {
|
|
|
|
|
self.set_flag(FLAGS::Z);
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
0xBA => unsafe {
|
|
|
|
|
if self.state.af.as_u8s.left == self.state.de.as_u8s.left {
|
|
|
|
|
self.set_flag(FLAGS::Z);
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
0xBB => unsafe {
|
|
|
|
|
if self.state.af.as_u8s.left == self.state.de.as_u8s.right {
|
|
|
|
|
self.set_flag(FLAGS::Z);
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
0xBC => unsafe {
|
|
|
|
|
if self.state.af.as_u8s.left == self.state.hl.as_u8s.left {
|
|
|
|
|
self.set_flag(FLAGS::Z);
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
0xBD => unsafe {
|
|
|
|
|
if self.state.af.as_u8s.left == self.state.hl.as_u8s.right {
|
|
|
|
|
self.set_flag(FLAGS::Z);
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
0xBE => unsafe {
|
|
|
|
|
if self.state.af.as_u8s.left == self.memory.get(self.state.hl.as_u16) {
|
|
|
|
|
self.set_flag(FLAGS::Z);
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
0xBF => self.set_flag(FLAGS::Z),
|
|
|
|
|
0xC0 => unsafe {
|
|
|
|
|
if self.get_flag(FLAGS::Z) == 0 {
|
|
|
|
|
let address = self.state.sp.as_u16;
|
|
|
|
|
self.state.pc.as_u8s.left = self.memory.get(address);
|
|
|
|
|
self.state.pc.as_u8s.right = self.memory.get(address + 1);
|
|
|
|
|
self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_add(2);
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
0xC1 => unsafe {
|
|
|
|
|
let address = self.state.sp.as_u16;
|
|
|
|
|
self.state.bc.as_u8s.left = self.memory.get(address);
|
|
|
|
|
self.state.bc.as_u8s.right = self.memory.get(address + 1);
|
|
|
|
|
self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_add(2);
|
|
|
|
|
},
|
|
|
|
|
0xC2 => {
|
|
|
|
|
let word = self.ld_immediate_word();
|
|
|
|
|
if self.get_flag(FLAGS::Z) == 0 {
|
|
|
|
|
self.state.pc = word;
|
|
|
|
|
}
|
2023-01-16 12:13:53 +11:00
|
|
|
}
|
2023-01-16 19:28:03 +11:00
|
|
|
0xC3 => {
|
|
|
|
|
self.state.pc = self.ld_immediate_word();
|
2023-01-16 12:13:53 +11:00
|
|
|
}
|
2023-01-16 19:28:03 +11:00
|
|
|
0xC4 => {
|
|
|
|
|
let maybe_next = self.ld_immediate_word();
|
|
|
|
|
if self.get_flag(FLAGS::Z) == 0 {
|
|
|
|
|
self.push(self.state.pc);
|
|
|
|
|
self.state.pc = maybe_next;
|
|
|
|
|
}
|
2023-01-16 12:13:53 +11:00
|
|
|
}
|
2023-01-16 19:28:03 +11:00
|
|
|
0xC5 => self.push(self.state.bc),
|
|
|
|
|
0xC6 => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.ld_immediate_byte())
|
|
|
|
|
},
|
|
|
|
|
0xC7 => self.rst(0x00),
|
|
|
|
|
0xC8 => {
|
|
|
|
|
if self.get_flag(FLAGS::Z) == 1 {
|
|
|
|
|
self.state.pc = self.pop_word()
|
|
|
|
|
}
|
2023-01-16 12:13:53 +11:00
|
|
|
}
|
2023-01-16 19:28:03 +11:00
|
|
|
0xC9 => self.state.pc = self.pop_word(),
|
|
|
|
|
0xCA => {
|
|
|
|
|
let maybe_next = self.ld_immediate_word();
|
|
|
|
|
if self.get_flag(FLAGS::Z) == 1 {
|
|
|
|
|
self.state.pc = maybe_next;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
0xCB => println!("Undefined behaviour: opcode CB"),
|
|
|
|
|
0xCC => {
|
|
|
|
|
let maybe_next = self.ld_immediate_word();
|
|
|
|
|
if self.get_flag(FLAGS::Z) == 1 {
|
|
|
|
|
self.push(self.state.pc);
|
|
|
|
|
self.state.pc = maybe_next;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
0xCD => {
|
|
|
|
|
self.push(self.state.pc);
|
2023-01-16 12:13:53 +11:00
|
|
|
self.state.pc = self.ld_immediate_word();
|
|
|
|
|
}
|
2023-01-16 19:28:03 +11:00
|
|
|
0xCE => unsafe {
|
|
|
|
|
self.state.af.as_u8s.left = self
|
|
|
|
|
.state
|
|
|
|
|
.af
|
|
|
|
|
.as_u8s
|
|
|
|
|
.left
|
|
|
|
|
.wrapping_add(self.ld_immediate_byte() + self.get_flag(FLAGS::C))
|
|
|
|
|
},
|
|
|
|
|
0xCF => self.rst(0x08),
|
|
|
|
|
|
2023-01-16 12:13:53 +11:00
|
|
|
0xEA => {
|
|
|
|
|
unsafe {
|
|
|
|
|
let address = self.ld_immediate_word().as_u16;
|
|
|
|
|
self.memory.set(address, self.state.af.as_u8s.left);
|
|
|
|
|
};
|
|
|
|
|
}
|
|
|
|
|
_ => {
|
|
|
|
|
panic!("unimplemented opcode: {:#X}", opcode);
|
|
|
|
|
}
|
|
|
|
|
};
|
|
|
|
|
return opcode;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
fn next_opcode(&mut self) -> u8 {
|
|
|
|
|
unsafe {
|
|
|
|
|
let opcode = self.memory.get(self.state.pc.as_u16);
|
2023-01-16 19:28:03 +11:00
|
|
|
self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(0x1);
|
2023-01-16 12:13:53 +11:00
|
|
|
return opcode;
|
|
|
|
|
};
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-16 19:28:03 +11:00
|
|
|
fn rst(&mut self, address: u16) {
|
|
|
|
|
self.push(self.state.pc);
|
|
|
|
|
self.state.pc.as_u8s.left = 0x0;
|
|
|
|
|
self.state.pc.as_u8s.right = self.memory.get(address);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
fn push(&mut self, register: Register) {
|
|
|
|
|
unsafe {
|
|
|
|
|
let address = self.state.sp.as_u16;
|
|
|
|
|
self.memory.set(address - 1, register.as_u8s.right);
|
|
|
|
|
self.memory.set(address - 2, register.as_u8s.left);
|
|
|
|
|
self.state.sp.as_u16 = address - 2;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
fn pop_word(&mut self) -> Register {
|
|
|
|
|
unsafe {
|
|
|
|
|
let address = self.state.sp.as_u16;
|
|
|
|
|
self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_add(2);
|
|
|
|
|
Register {
|
|
|
|
|
as_u8s: Inner {
|
|
|
|
|
left: self.memory.get(address),
|
|
|
|
|
right: self.memory.get(address + 1),
|
|
|
|
|
},
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-16 14:23:06 +11:00
|
|
|
fn store_word(&mut self, address: u16, word: Register) {
|
|
|
|
|
unsafe {
|
|
|
|
|
self.memory.set(address, word.as_u8s.left);
|
|
|
|
|
self.memory.set(address + 1, word.as_u8s.right);
|
|
|
|
|
};
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-16 12:13:53 +11:00
|
|
|
fn ld_immediate_word(&mut self) -> Register {
|
|
|
|
|
Register {
|
|
|
|
|
as_u8s: Inner {
|
|
|
|
|
left: self.next_opcode(),
|
|
|
|
|
right: self.next_opcode(),
|
|
|
|
|
},
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
fn ld_immediate_byte(&mut self) -> u8 {
|
|
|
|
|
self.next_opcode()
|
|
|
|
|
}
|
2023-01-16 14:23:06 +11:00
|
|
|
|
|
|
|
|
fn get_flag(&mut self, flag: FLAGS) -> u8 {
|
|
|
|
|
unsafe {
|
|
|
|
|
return self.state.af.as_u8s.right & (1 << flag as u8);
|
|
|
|
|
}
|
|
|
|
|
}
|
2023-01-16 19:28:03 +11:00
|
|
|
|
|
|
|
|
fn set_flag(&mut self, flag: FLAGS) {
|
|
|
|
|
unsafe {
|
|
|
|
|
self.state.af.as_u8s.right = self.state.af.as_u8s.right.bitor(1 << flag as u8);
|
|
|
|
|
};
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[allow(dead_code)]
|
|
|
|
|
fn clear_flag(&mut self, flag: FLAGS) {
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|
|
|
|
unsafe {
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|
|
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self.state.af.as_u8s.right = self.state.af.as_u8s.right.bitand(!(1 << flag as u8));
|
|
|
|
|
};
|
|
|
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}
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|
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fn toggle_flag(&mut self, flag: FLAGS) {
|
|
|
|
|
unsafe {
|
|
|
|
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self.state.af.as_u8s.right = self.state.af.as_u8s.right.bitxor(1 << flag as u8);
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|
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};
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}
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2023-01-16 12:13:53 +11:00
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}
|
