117 lines
3.8 KiB
Java
117 lines
3.8 KiB
Java
/* ###
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* IP: GHIDRA
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* REVIEWED: YES
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//With cursor on switch's "add pc, .." command, this script will add references on the switch offset table to corresponding code.
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//Make sure your table consists of defined data (db,dw,etc).
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//@category ARM
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/*
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* This script has 2 preconditions:
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* 1. Your switch table should already be defined data
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* 2. Make sure your cursor is on the "add pc, .." command.
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*/
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import ghidra.app.script.GhidraScript;
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import ghidra.program.model.address.*;
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import ghidra.program.model.data.*;
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import ghidra.program.model.listing.*;
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import ghidra.program.model.symbol.*;
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import ghidra.util.NumericUtilities;
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public class AddReferencesInSwitchTable extends GhidraScript {
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@Override
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public void run() throws Exception {
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println("This script attempts to add references to a switch table to corresponding code.\n"
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+ "BEFORE running this script, \n"
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+ " 1. Your switch table should already be defined data.\n"
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+ " 2. Make sure your cursor is on the \"add pc, ..\" command.\n"
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+ "Note: Adding the same reference twice does not have any impact.\n");
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Program program = currentProgram;
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Listing listing = program.getListing();
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Address startAddr = currentAddress;
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Address pc = startAddr.add(4);
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Address prevAddr = null;
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int diff = 0;
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// Get data iterator
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DataIterator dataIter = listing.getDefinedData(startAddr, true);
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// Find and add reference to first table entry
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Data data = dataIter.next();
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CalcAndAddReference( data, pc );
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prevAddr = data.getMinAddress();
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// Determine address difference between each switch table entry
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DataType type = data.getDataType();
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String typeName = type.getName();
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//println( "type: " + typeName );
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if ( typeName.equalsIgnoreCase("byte") )
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diff = 1;
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else if ( type.getName().equalsIgnoreCase("word") )
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diff = 2;
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else if ( type.getName().equalsIgnoreCase("dword") )
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diff = 4;
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else {
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popup( "Sorry, type " + typeName + " is not supported yet. (Try adding it yourself.)");
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return;
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}
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// Iterate through rest of table
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while (dataIter.hasNext() && !monitor.isCancelled()) {
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data = dataIter.next();
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Address currAddr = data.getMinAddress();
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monitor.setMessage(currAddr.toString());
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// Check if consecutive next entry in switch table
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if ( currAddr.subtract(prevAddr) == diff ) {
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// Save currAddr as prevAddr
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prevAddr = currAddr;
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// Add reference
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CalcAndAddReference( data, pc );
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}
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else {
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// Passed end of switch table...Exit script
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break;
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}
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}
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} // end run()
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private void CalcAndAddReference(Data data, Address pc) {
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// Get current data value in switch table
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//println("value: " + data.getValue().toString().substring(2));
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long currVal = NumericUtilities.parseHexLong(data.getValue().toString().substring(2));
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// Calculate referenced addr
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// (using addWrap so that an exception is not thrown when past the switch table)
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Address refAddr = pc.addWrap(2 * currVal);
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// Add reference
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println("Adding ref " + refAddr.toString() + " to address " + data.getAddressString(false, true));
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data.addValueReference(refAddr, RefType.COMPUTED_JUMP);
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}
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}
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