Implement DIV

src/instructions.rs

@@ -40,6 +40,7 @@ pub(crate) fn find_and_exec(instr: Instruction, core: &mut Core) -> Result<(), E
             (0b101, 0b0100000) => rvi::sra(core, instr),
             (0b111, 0b0000000) => rvi::and(core, instr),
             (0b100, 0b0000000) => rvi::xor(core, instr),
+            (0b100, 0b0000001) => rvm::div(core, instr),
             (0b110, 0b0000000) => rvi::or(core, instr),
             _ => illegal(instr),
         },

src/instructions/rvm.rs

@@ -6,4 +6,11 @@
 //
 use crate::{core::Core, decode::Instruction, exceptions::Exception};
 
+// multiplication
 instr_op_r!(mul, u64::wrapping_mul);
+
+// division
+instr_op_r!(div, |a, b| match b {
+    0 => -1,
+    _ => i64::wrapping_div(a as i64, b as i64),
+} as u64);