basic skeleton

Server/src/main/java/net/simon987/server/assembly/instruction/SetccInstruction.java

@@ -0,0 +1,77 @@
+package net.simon987.server.assembly.instruction;
+
+import net.simon987.server.assembly.Instruction;
+import net.simon987.server.assembly.Status;
+import net.simon987.server.assembly.Target;
+import net.simon987.server.assembly.Util;
+import net.simon987.server.assembly.Operand;;
+
+import net.simon987.server.assembly.exception.IllegalOperandException;
+
+import java.io.ByteArrayOutputStream;
+
+/**
+ * Implementation of the SETcc family of instructions
+ * http://www.ousob.com/ng/iapx86/ng22d84.php
+ * 
+ * Current problems to get this working is:
+ * - The assembler uses the instruction set to get an instruction by mnemonic, have to check how other alias instructions will be implemented
+ * 
+ * Stuff to consider
+ * - move the implementation of each instruction to its own class that extends this class
+ */
+public class SetccInstruction extends Instruction {
+
+    public static final int OPCODE = 50;
+
+    public SetccInstruction() {
+        // NOTE: The assembler treat this string as a valid mnemonic
+        super("setcc", OPCODE);
+    }
+
+    public SetccInstruction(String mnemonic) {
+        super(mnemonic, OPCODE);
+    }
+
+    /**
+     * Generic switch on the (family) opcode
+     * The SET instructions set the 8-bit destination to 1 if the
+     * specified condition is true, otherwise destination is set to 0.
+     * 
+     *   Instruction        SET to 1 if ... else to 0            Flags
+     *   SETA, SETNBE       Above, Not Below or Equal            CF=0 AND ZF=0
+     *   SETAE,SETNB,SETNC  Above or Equal, Not Below, No Carry  CF=0
+     *   SETBE, SETNA       Below or Equal, Not Above            CF=1 OR ZF=1
+     *   SETB, SETC,SETNAE  Below, Carry, Not Above or Equal     CF=1
+     *   SETE, SETZ         Equal, Zero                          ZF=1
+     *   SETNE, SETNZ       Not Equal, Not Zero                  ZF=0
+     *
+     *   SETG, SETNLE       Greater, Not Less or Equal           SF=OF AND ZF=0
+     *   SETGE, SETNL       Greater or Equal, Not Less           SF=OF
+     *   SETLE, SETNG       Less or Equal, Not Greater           SF<>OF OR ZF=1
+     *   SETL, SETNGE       Less, Not Greater or Equal           SF<>OF
+     *   SETO               Overflow                             OF=1
+     *   SETNO              No Overflow                          OF=0
+     *   SETS               Sign (negative)                      SF=1
+     *   SETNS              No Sign (positive)                   SF=0
+     */
+    private static Status setcc(Target dst, int dstIndex, int familyOpCode, Status status) {
+        return status;
+    }
+
+    /**
+     * Target can be a memory location or register adressable by dst[dstIndex]
+     * FamilyOpcode is the value encoded in the source operand as immideate value
+     * it will be used to determince what specfic SETcc operation should be execute
+     */
+    @Override
+    public Status execute(Target dst, int dstIndex, int familyOpCode, Status status) {
+        return setcc(dst, dstIndex, familyOpCode, status);
+    }
+
+    @Override
+    public void encode(ByteArrayOutputStream out, Operand o1, int currentLine) {
+
+        return;
+    }
+}