emu: Fake opcode ASSERT for testing

src/emu/operations.rs

@@ -1,3 +1,5 @@
+use std::fmt::Debug;
+
 use emu::byteorder::{ByteOrder, LittleEndian};
 use emu::dos;
 use emu::i8088::i8088;
@@ -5,6 +7,12 @@ use emu::operands::{Addr, Address, LValue, Reg, RValue};
 use emu::pc::Bus;
 use emu::util::segoff_to_addr;
 
+pub fn assert<T: Debug + Eq>(loc: &impl RValue<T>, val: &impl RValue<T>) {
+  assert_eq!(loc.read(), val.read(),
+             "ASSERT instruction failed: {:#2X?} != {:#2X?}", loc.read(), val.read());
+  println!("ASSERT pass: {:#2X?} == {:#2X?}", loc.read(), val.read());
+}
+
 pub fn show(cpu: &mut i8088) {
   println!("{:#X?}", cpu);
 }