86 lines
2.5 KiB
Java
86 lines
2.5 KiB
Java
package com.bytezone.diskbrowser.applefile;
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import java.util.ArrayList;
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import java.util.List;
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// -----------------------------------------------------------------------------------//
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public class AssemblerBlocks
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// -----------------------------------------------------------------------------------//
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{
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// ---------------------------------------------------------------------------------//
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public AssemblerBlocks (byte[] buffer, int loadAddress)
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// ---------------------------------------------------------------------------------//
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{
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int ptr = 0;
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boolean inCode = true;
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int address = loadAddress;
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List<Integer> loadTargets = new ArrayList<> ();
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List<Integer> branchTargets = new ArrayList<> ();
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while (ptr < buffer.length)
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{
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if (branchTargets.contains (address))
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inCode = true;
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if (inCode)
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{
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AssemblerStatement cmd = new AssemblerStatement (buffer[ptr]);
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if (cmd.size == 2 && ptr < buffer.length - 1)
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cmd.addData (buffer[ptr + 1]);
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else if (cmd.size == 3 && ptr < buffer.length - 2)
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cmd.addData (buffer[ptr + 1], buffer[ptr + 2]);
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else
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cmd.size = 1;
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cmd.address = address;
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if (branchTargets.contains (address))
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System.out.print ("> ");
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else
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System.out.print (" ");
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System.out.printf ("%s%n", cmd);
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ptr += cmd.size;
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address += cmd.size;
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// RTS, JMP
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if (cmd.opcode == 0x60 || cmd.opcode == 0x4C)
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inCode = false;
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// JMP, JMP, JSR
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// System.out.printf ("%02X %02X %02X%n", cmd.opcode, cmd.operand1, cmd.operand2);
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if (cmd.opcode == 0x4C || cmd.opcode == 0x6C || cmd.opcode == 0x20)
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{
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branchTargets.add (cmd.target);
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}
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if (cmd.opcode == 0xB9)
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{
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int target = ((cmd.operand2 & 0xFF) << 8) | (cmd.operand1 & 0xFF);
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loadTargets.add (target);
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}
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// branch relative
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if (cmd.offset != 0)
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branchTargets.add (cmd.address + cmd.offset + 2);
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}
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else
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{
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if (loadTargets.contains (address))
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System.out.print ("* ");
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else
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System.out.print (" ");
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System.out.printf ("%06X %02X %s%n", address, buffer[ptr],
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(char) (buffer[ptr] & 0x7F));
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ptr += 1;
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address += 1;
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}
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}
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for (int loadTarget : loadTargets)
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System.out.printf ("load : $%04X%n", loadTarget);
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for (int branchTarget : branchTargets)
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System.out.printf ("branch: $%04X%n", branchTarget);
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}
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}
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