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debug.rs
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debug.rs
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use std::io;
use std::io::Write;
use std::sync::mpsc;
use crate::registers::Registers;
pub trait Debuggable {
fn step(&mut self);
fn resume(&mut self);
fn request_registers(&mut self) -> Option<Registers>;
fn request_next_instruction(&mut self) -> Option<[u8; 3]>;
fn set_breakpoint_on_instr(&mut self, instr: u8);
}
pub enum RemoteDebugMessage {
Step,
Resume,
RequestRegisters,
RequestNextInstr,
SetBreakpointOnInstr(u8),
}
pub enum RemoteDebugMessageResponse {
RequestRegisters(Registers),
RequestNextInstr([u8; 3]),
}
pub struct DebuggerRemote {
sender: mpsc::Sender<RemoteDebugMessage>,
receiver: mpsc::Receiver<RemoteDebugMessageResponse>,
}
impl DebuggerRemote {
pub fn new(
sender: mpsc::Sender<RemoteDebugMessage>,
receiver: mpsc::Receiver<RemoteDebugMessageResponse>,
) -> DebuggerRemote {
return DebuggerRemote {
sender: sender,
receiver: receiver,
};
}
pub fn wait_for_response(&mut self) {
let msg = self.receiver.recv().unwrap();
match msg {
RemoteDebugMessageResponse::RequestRegisters(registers) => {
println!("PC: {:04X}", registers.pc);
println!("SP: {:04X}", registers.sp);
println!("AF: {:04X}", registers.af);
println!("BC: {:04X}", registers.bc);
println!("DE: {:04X}", registers.de);
println!("HL: {:04X}", registers.hl);
}
RemoteDebugMessageResponse::RequestNextInstr(bytes) => {
println!("{:02X} {:02X} {:02X}", bytes[0], bytes[1], bytes[2]);
}
}
}
pub fn update(&mut self) {
let mut buffer = String::new();
print!("> ");
let _ = std::io::stdout().flush();
io::stdin().read_line(&mut buffer).unwrap();
if buffer.starts_with("reg") {
self.request_registers();
} else if buffer.starts_with("c") {
self.resume();
} else if buffer.starts_with("l") {
self.request_next_instruction();
} else if buffer.starts_with("s") {
self.step();
} else if buffer.starts_with("bi") {
if buffer.len() < 5 {
println!("Invalid argument");
} else {
let mut bytes = [0u8; 1];
hex::decode_to_slice(&buffer[3..5], &mut bytes as &mut [u8]).unwrap();
self.set_breakpoint_on_instr(bytes[0]);
}
}
}
}
impl Debuggable for DebuggerRemote {
fn step(&mut self) {
self.sender.send(RemoteDebugMessage::Step).unwrap();
}
fn resume(&mut self) {
self.sender.send(RemoteDebugMessage::Resume).unwrap();
}
fn request_registers(&mut self) -> Option<Registers> {
self.sender
.send(RemoteDebugMessage::RequestRegisters)
.unwrap();
self.wait_for_response();
return None;
}
fn request_next_instruction(&mut self) -> Option<[u8; 3]> {
self.sender
.send(RemoteDebugMessage::RequestNextInstr)
.unwrap();
self.wait_for_response();
return None;
}
fn set_breakpoint_on_instr(&mut self, instr: u8) {
self.sender
.send(RemoteDebugMessage::SetBreakpointOnInstr(instr))
.unwrap();
}
}
pub struct DebuggerHost {
receiver: mpsc::Receiver<RemoteDebugMessage>,
sender: mpsc::Sender<RemoteDebugMessageResponse>,
}
impl DebuggerHost {
pub fn new(
receiver: mpsc::Receiver<RemoteDebugMessage>,
sender: mpsc::Sender<RemoteDebugMessageResponse>,
) -> DebuggerHost {
return DebuggerHost {
receiver: receiver,
sender: sender,
};
}
pub fn update(&mut self, debuggable: &mut impl Debuggable) {
let msg = self.receiver.try_recv();
match msg {
Ok(msg) => match msg {
RemoteDebugMessage::Step => {
debuggable.step();
}
RemoteDebugMessage::Resume => {
debuggable.resume();
}
RemoteDebugMessage::RequestRegisters => {
let regs = debuggable.request_registers().unwrap();
self.sender
.send(RemoteDebugMessageResponse::RequestRegisters(regs))
.unwrap();
}
RemoteDebugMessage::RequestNextInstr => {
let bytes = debuggable.request_next_instruction().unwrap();
self.sender
.send(RemoteDebugMessageResponse::RequestNextInstr(bytes))
.unwrap();
}
RemoteDebugMessage::SetBreakpointOnInstr(instr) => {
debuggable.set_breakpoint_on_instr(instr);
}
},
Err(error) => match error {
mpsc::TryRecvError::Empty => {}
mpsc::TryRecvError::Disconnected => {
println!("Remote debugger disconnected");
}
},
}
}
}