From 159ab62ebfae70a0fef61142602026df0b5e8b0e Mon Sep 17 00:00:00 2001
From: dogeystamp <dogeystamp@disroot.org>
Date: Sat, 6 Jan 2024 16:44:19 -0500
Subject: [PATCH] opcode: JMP

---
 src/vm/instruction.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/vm/instruction.rs b/src/vm/instruction.rs
index 86cf402..92b0010 100644
--- a/src/vm/instruction.rs
+++ b/src/vm/instruction.rs
@@ -85,7 +85,7 @@ pub fn execute_instruction(vm: &mut VM, instr: u16) {
         OpCode::NOT => op_not(vm, instr),
         OpCode::LDI => op_ldi(vm, instr),
         OpCode::STI => op_sti(vm, instr),
-        OpCode::JMP => todo!("JMP"),
+        OpCode::JMP => op_jmp(vm, instr),
         OpCode::RES => todo!("RES"),
         OpCode::LEA => op_lea(vm, instr),
         OpCode::TRAP => op_trap(vm, instr),
@@ -169,6 +169,13 @@ fn op_br(vm: &mut VM, instr: u16) {
     }
 }
 
+fn op_jmp(vm: &mut VM, instr: u16) {
+    // RET is a special case of this where BaseR is R7
+    let base_r = (instr >> 6) & 0b111;
+
+    vm.registers.pc = vm.registers.get_reg(base_r);
+}
+
 ////////////////
 // Store ops
 ////////////////