| /******************************************************************************* |
| * Copyright (c) 2009, 2010 Nokia and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Nokia - Initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.cdt.debug.edc.x86.disassembler; |
| |
| import java.math.BigInteger; |
| import java.text.MessageFormat; |
| import java.util.ArrayList; |
| import java.util.StringTokenizer; |
| |
| import org.eclipse.cdt.core.IAddress; |
| import org.eclipse.cdt.debug.edc.IAddressExpressionEvaluator; |
| import org.eclipse.cdt.debug.edc.internal.EDCDebugger; |
| import org.eclipse.cdt.debug.edc.services.IEDCExecutionDMC; |
| import org.eclipse.cdt.debug.edc.services.IEDCMemory; |
| import org.eclipse.cdt.debug.edc.services.Registers; |
| import org.eclipse.cdt.dsf.debug.service.IMemory; |
| import org.eclipse.cdt.dsf.debug.service.IRegisters; |
| import org.eclipse.cdt.dsf.debug.service.IRunControl.IExecutionDMContext; |
| import org.eclipse.cdt.utils.Addr64; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.debug.core.model.MemoryByte; |
| |
| /** |
| * Address expression evaluator for x86.<br> |
| * <br> |
| * Examples expressions for x86: |
| * |
| * <pre> |
| * *%ecx : address in ECX register |
| * *0x831cffc : address in memory address 0x831cffc |
| * *0x831cee8(,%eax,4) : |
| * *0x3(%edx) |
| * $0xfebc,$0x12345 : offset 0x12345 in segment 0xfebc (?) |
| * </pre> |
| */ |
| public class AddressExpressionEvaluatorX86 implements IAddressExpressionEvaluator { |
| |
| public IAddress evaluate(IExecutionDMContext context, String expression, IRegisters regService, IMemory memService) |
| throws CoreException { |
| |
| IAddress ret = null, memAddr = null; |
| Registers edcRegService = (Registers) regService; |
| |
| if (expression.startsWith("*")) { |
| String str = expression.substring(1); |
| |
| StringTokenizer tokenizer = new StringTokenizer(str, "(,)"); |
| int tokenCnt = tokenizer.countTokens(); |
| |
| if (tokenCnt == 1) { |
| // "*%eax", "*(%esi)", or "*0x80000" |
| |
| String token = tokenizer.nextToken(); |
| |
| if (token.startsWith("%")) { |
| String regName = token.substring(1).toUpperCase(); |
| |
| String val = edcRegService.getRegisterValue(context, regName); |
| |
| memAddr = new Addr64(val, 16); |
| } else { // must be a hex string like 0x80000 |
| memAddr = new Addr64(token.substring(2), 16); |
| // read from the memAddr below. |
| } |
| } else if (tokenCnt >= 2 && tokenCnt <= 4) { |
| // 1) *0x3(%edx) |
| // 2) *0x831cee8(,%eax,4) |
| // 3) *0x831cee8(%ebx,%eax,4) |
| |
| String token = tokenizer.nextToken(); |
| |
| // offset can be negative |
| boolean is_negative = false; |
| if (token.startsWith("-")) { |
| is_negative = true; |
| token = token.substring(1); |
| } |
| |
| BigInteger offset = new BigInteger(token.substring(2), 16); |
| |
| if (is_negative) |
| offset = offset.negate(); |
| |
| String baseReg = null, indexReg = null; |
| int scale = 1; |
| |
| if (tokenCnt == 2) { |
| indexReg = tokenizer.nextToken().substring(1).toUpperCase(); |
| scale = 1; |
| } else if (tokenCnt == 3) { |
| indexReg = tokenizer.nextToken().substring(1).toUpperCase(); |
| scale = Integer.valueOf(tokenizer.nextToken()); |
| } else if (tokenCnt == 4) { |
| baseReg = tokenizer.nextToken().substring(1).toUpperCase(); |
| indexReg = tokenizer.nextToken().substring(1).toUpperCase(); |
| scale = Integer.valueOf(tokenizer.nextToken()); |
| } |
| |
| long base = 0, index = 0; |
| |
| if (baseReg != null) |
| base = Long.valueOf(edcRegService.getRegisterValue((IEDCExecutionDMC) context, baseReg), 16); |
| if (indexReg != null) |
| index = Long.valueOf(edcRegService.getRegisterValue((IEDCExecutionDMC) context, indexReg), 16); |
| |
| long sum = offset.longValue() + base + index * scale; |
| memAddr = new Addr64(BigInteger.valueOf(sum)); |
| // next read the memAddr to get the address we need. |
| } else { |
| // invalid |
| throw new CoreException(new Status(IStatus.ERROR, EDCDebugger.PLUGIN_ID, MessageFormat.format( |
| "Jump address expression {0} is invalid.", expression))); |
| } |
| } else if (expression.startsWith("$")) { |
| throw new CoreException(new Status(IStatus.ERROR, EDCDebugger.PLUGIN_ID, MessageFormat.format( |
| "Far jump address {0} is not supported yet.", expression))); |
| } |
| |
| // Now read memory to get our final address |
| // |
| if (ret == null && memAddr != null) { |
| ArrayList<MemoryByte> memBuffer = new ArrayList<MemoryByte>(); |
| |
| IStatus st = ((IEDCMemory)memService).getMemory((IEDCExecutionDMC) context, memAddr, memBuffer, 4, 1); |
| |
| if (!st.isOK()) |
| throw new CoreException(st); |
| |
| byte[] bytes = new byte[memBuffer.size()]; |
| assert(bytes.length == 4); |
| |
| for (int i = 0; i < 4; i++) { |
| // check each byte |
| if (!memBuffer.get(i).isReadable()) |
| throw new CoreException(new Status(IStatus.ERROR, EDCDebugger.PLUGIN_ID, |
| ("Cannot read memory at 0x" + memAddr.add(i).getValue().toString(16)))); |
| // Note we need the "bytes" in big-endian byte order. |
| bytes[i] = memBuffer.get(4-1-i).getValue(); |
| } |
| |
| ret = new Addr64(new BigInteger(bytes)); |
| } |
| |
| return ret; |
| } |
| |
| } |