Stub out reading registers and memory

src/gdbserver.rs

@@ -212,6 +212,33 @@ impl GdbConnection {
             } else if req.match_str("c") || req.match_str("vCont;c:") {
                 self.client.send_command(EmulatorCommand::Resume);
                 // Don't send a response until we hit a breakpoint or get interrupted
+            } else if req.match_str("p") {
+                let Some(register) = req.match_hex::<u32>() else {
+                    let res = self.response();
+                    self.send(res).await?;
+                    continue;
+                };
+                let res = self.response().write_hex(register);
+                self.send(res).await?;
+            } else if req.match_str("m") {
+                let mut read_params = || {
+                    let start = req.match_hex::<u32>()?;
+                    if !req.match_str(",") {
+                        return None;
+                    };
+                    let size = req.match_hex::<u32>()?;
+                    Some((start, size))
+                };
+                let Some((start, size)) = read_params() else {
+                    let res = self.response();
+                    self.send(res).await?;
+                    continue;
+                };
+                let mut res = self.response();
+                for i in 0..size {
+                    res = res.write_hex((start + i) as u8);
+                }
+                self.send(res).await?;
             } else {
                 // unrecognized command
                 let res = self.response();