1 /* 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.debugger.windows.x86; 26 27 import sun.jvm.hotspot.debugger.*; 28 import sun.jvm.hotspot.debugger.x86.*; 29 import sun.jvm.hotspot.debugger.cdbg.*; 30 import sun.jvm.hotspot.debugger.cdbg.basic.*; 31 import sun.jvm.hotspot.debugger.windbg.*; 32 33 public class WindowsX86CFrame extends BasicCFrame { 34 private Address ebp; 35 private Address pc; 36 37 private static final int ADDRESS_SIZE = 4; 38 39 /** Constructor for topmost frame */ WindowsX86CFrame(WindbgDebugger dbg, Address ebp, Address pc)40 public WindowsX86CFrame(WindbgDebugger dbg, Address ebp, Address pc) { 41 super(dbg.getCDebugger()); 42 this.ebp = ebp; 43 this.pc = pc; 44 this.dbg = dbg; 45 } 46 sender(ThreadProxy thread)47 public CFrame sender(ThreadProxy thread) { 48 X86ThreadContext context = (X86ThreadContext) thread.getContext(); 49 /* 50 * Native code fills in the stack pointer register value using index 51 * X86ThreadContext.SP. 52 * See file sawindbg.cpp macro REG_INDEX(x). 53 * 54 * Be sure to use SP, or UESP which is aliased to SP in Java code, 55 * for the frame pointer validity check. 56 */ 57 Address esp = context.getRegisterAsAddress(X86ThreadContext.SP); 58 59 if ( (ebp == null) || ebp.lessThan(esp) ) { 60 return null; 61 } 62 63 // Check alignment of ebp 64 if ( dbg.getAddressValue(ebp) % ADDRESS_SIZE != 0) { 65 return null; 66 } 67 68 Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE); 69 if (nextEBP == null || nextEBP.lessThanOrEqual(ebp)) { 70 return null; 71 } 72 Address nextPC = ebp.getAddressAt( 1 * ADDRESS_SIZE); 73 if (nextPC == null) { 74 return null; 75 } 76 return new WindowsX86CFrame(dbg, nextEBP, nextPC); 77 } 78 pc()79 public Address pc() { 80 return pc; 81 } 82 localVariableBase()83 public Address localVariableBase() { 84 return ebp; 85 } 86 87 private WindbgDebugger dbg; 88 } 89