Improved syscall handling.

dcb-exe/src/inst/basic.rs

@@ -207,9 +207,8 @@ impl Executable for Inst {
 			Inst::Mult (inst) => inst.exec(state),
 			Inst::Shift(inst) => inst.exec(state),
 			Inst::Store(inst) => inst.exec(state),
-			//Inst::Sys  (inst) => inst.exec(state),
-			//Inst::Co   (inst) => inst.exec(state),
-			_ => todo!(),
+			Inst::Sys  (inst) => inst.exec(state),
+			Inst::Co   (_) => todo!(),
 		}
 	}
 }

dcb-exe/src/inst/basic/sys.rs

@@ -4,6 +4,7 @@
 use super::ModifiesReg;
 use crate::inst::{
 	basic::{Decode, TryEncode},
+	exec::{ExecCtx, ExecError, Executable},
 	parse::LineArg,
 	DisplayCtx, InstDisplay, InstFmtArg, Parsable, ParseCtx, ParseError, Register,
 };
@@ -121,3 +122,9 @@ impl ModifiesReg for Inst {
 		false
 	}
 }
+
+impl Executable for Inst {
+	fn exec<Ctx: ExecCtx>(&self, state: &mut Ctx) -> Result<(), ExecError> {
+		state.sys(*self)
+	}
+}

dcb-exe/src/inst/exec.rs

@@ -7,6 +7,7 @@ pub mod error;
 pub use error::ExecError;
 
 // Imports
+use super::basic;
 use crate::{
 	inst::{basic::mult::MultReg, Register},
 	Pos,
@@ -40,6 +41,9 @@ pub trait ExecCtx:
 
 	/// Writes a byte
 	fn write_byte(&mut self, pos: Pos, value: u8) -> Result<(), ExecError>;
+
+	/// Executes a syscall
+	fn sys(&mut self, inst: basic::sys::Inst) -> Result<(), ExecError>;
 }
 
 /// An executable instruction

dcb-exe/src/inst/exec/error.rs

@@ -33,6 +33,9 @@ pub enum ExecError {
 	JumpWhileJumping,
 
 	/// Unknown syscall
-	#[error("Unknown syscall")]
-	UnknownSys,
+	#[error("Unknown syscall {comment:#x}")]
+	UnknownSys {
+		/// Syscall comment
+		comment: u32,
+	},
 }