/* ###
 * IP: GHIDRA
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// Apply the information from a System.map file or /proc/ksyms to the listing.
// Symbol names are applied. If the symbol type is available, as in the
// System.map file, disassembly and function creation are done for text symbols.

//  The System.map file has the following format (it is generated by nm):
//  <tt>
//  [address] [type] [name]
//	-address is a hex value, say c010000
//	-type is the type of symbol: `man nm` for them all; T is a function
//	-name is the name of the symbol
//  </tt>
//  /proc/ksyms eliminates the middle column, and may add the name of the module
//  in square brackets at the end of the line.

//@category CustomerSubmission.Linux

import java.io.*;

import ghidra.app.script.GhidraScript;
import ghidra.program.model.address.*;
import ghidra.program.model.symbol.SourceType;
import ghidra.program.model.symbol.SymbolTable;
import ghidra.util.exception.InvalidInputException;

public class LinuxSystemMapImportScript extends GhidraScript {

	@Override
	public void run() throws Exception {
		File file = askFile("Please specify the System.Map to apply", "Apply");
		BufferedReader reader = new BufferedReader(new FileReader(file));
		try {
			readSystemMap(reader);
		}
		finally {
			reader.close();
		}
	}

	private void readSystemMap(BufferedReader reader) throws IOException {

		SymbolTable st = currentProgram.getSymbolTable();
		AddressSpace addrspace = currentProgram.getAddressFactory().getDefaultAddressSpace();
		if (currentSelection != null && !currentSelection.isEmpty()) {
			addrspace = currentProgram.getAddressFactory().getDefaultAddressSpace();
		}

		int lineno = 0;
		String line;
		while (!monitor.isCancelled() && (line = reader.readLine()) != null) {
			lineno++;
			line = line.trim();
			String address, type, name;

			String[] tokens = line.split("\\s");
			if (tokens.length == 3) {
				address = tokens[0];
				type = tokens[1];
				name = tokens[2];
				// account for /proc/ksyms output of the type: c0100000 modulesym [module]
				if (name.matches("^\\[.*]$")) {
					name = tokens[1] + "__" + tokens[2];
					type = "";
				}
			}
			else if (tokens.length == 2) {
				address = tokens[0];
				type = "";
				name = tokens[1];
			}
			else {
				println("Error parsing line " + lineno + ": \"" + line + "\".");
				continue;
			}

			Address addr = getAddress(addrspace, address);
			if (addr == null) {
				println("Error parsing line " + lineno + ": \"" + line +
					"\": could not parse address.");
				continue;
			}

			try {
				st.createLabel(addr, name, SourceType.USER_DEFINED);
			}
			catch (InvalidInputException e) {
				println("Error adding label for line " + lineno + ": \"" + line + "\"");
				continue;
			}

			if (type.equalsIgnoreCase("t")) {
				// This is a function
				disassemble(addr);
				createFunction(addr, name);
			}
		}
	}

	private Address getAddress(AddressSpace addrspace, String addressString) {
		try {
			return addrspace.getAddress("0x" + addressString);
		}
		catch (AddressFormatException e) {
			return null;
		}
	}
}