Added XCHG Instruction #5. Placeholder class for LEA #1

Server/src/net/simon987/server/assembly/CPU.java

@@ -93,6 +93,7 @@ public class CPU implements JSONSerialisable{
         instructionSet.add(new JsInstruction(this));
         instructionSet.add(new HwiInstruction(this));
         instructionSet.add(new HwqInstruction(this));
+        instructionSet.add(new XchgInstruction(this));
 
         status = new Status();
         memory = new Memory(config.getInt("memory_size"));

Server/src/net/simon987/server/assembly/instruction/LeaInstruction.java

@@ -0,0 +1,14 @@
+package net.simon987.server.assembly.instruction;
+
+import net.simon987.server.assembly.Instruction;
+
+public class LeaInstruction extends Instruction {
+
+    public static final int OPCODE = 30;
+
+    public LeaInstruction() {
+        super("lea", OPCODE);
+    }
+
+
+}

Server/src/net/simon987/server/assembly/instruction/XchgInstruction.java

@@ -0,0 +1,33 @@
+package net.simon987.server.assembly.instruction;
+
+import net.simon987.server.assembly.CPU;
+import net.simon987.server.assembly.Instruction;
+import net.simon987.server.assembly.Status;
+import net.simon987.server.assembly.Target;
+
+
+/**
+ * Swap operands. Does not alter the flags
+ */
+public class XchgInstruction extends Instruction {
+
+    public static final int OPCODE = 31;
+
+    private CPU cpu;
+
+    public XchgInstruction(CPU cpu) {
+        super("xchg", OPCODE);
+
+        this.cpu = cpu;
+    }
+
+    @Override
+    public Status execute(Target dst, int dstIndex, Target src, int srcIndex, Status status) {
+
+        int tmp = dst.get(dstIndex);
+        dst.set(dstIndex, src.get(srcIndex));
+        src.set(srcIndex, tmp);
+
+        return status;
+    }
+}