1 /* 2 * Copyright (c) 2003, 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.bsd.x86; 26 27 import sun.jvm.hotspot.debugger.*; 28 import sun.jvm.hotspot.debugger.bsd.*; 29 import sun.jvm.hotspot.debugger.cdbg.*; 30 import sun.jvm.hotspot.debugger.cdbg.basic.*; 31 import sun.jvm.hotspot.debugger.x86.*; 32 33 final public class BsdX86CFrame extends BasicCFrame { 34 // package/class internals only BsdX86CFrame(BsdDebugger dbg, Address ebp, Address pc)35 public BsdX86CFrame(BsdDebugger dbg, Address ebp, Address pc) { 36 super(dbg.getCDebugger()); 37 this.ebp = ebp; 38 this.pc = pc; 39 this.dbg = dbg; 40 } 41 42 // override base class impl to avoid ELF parsing closestSymbolToPC()43 public ClosestSymbol closestSymbolToPC() { 44 // try native lookup in debugger. 45 return dbg.lookup(dbg.getAddressValue(pc())); 46 } 47 pc()48 public Address pc() { 49 return pc; 50 } 51 localVariableBase()52 public Address localVariableBase() { 53 return ebp; 54 } 55 sender(ThreadProxy thread)56 public CFrame sender(ThreadProxy thread) { 57 X86ThreadContext context = (X86ThreadContext) thread.getContext(); 58 /* 59 * Native code fills in the stack pointer register value using index 60 * X86ThreadContext.SP. 61 * See file BsdDebuggerLocal.c macro REG_INDEX(reg). 62 * 63 * Be sure to use SP, or UESP which is aliased to SP in Java code, 64 * for the frame pointer validity check. 65 */ 66 Address esp = context.getRegisterAsAddress(X86ThreadContext.SP); 67 68 if ( (ebp == null) || ebp.lessThan(esp) ) { 69 return null; 70 } 71 72 // Check alignment of ebp 73 if ( dbg.getAddressValue(ebp) % ADDRESS_SIZE != 0) { 74 return null; 75 } 76 77 Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE); 78 if (nextEBP == null || nextEBP.lessThanOrEqual(ebp)) { 79 return null; 80 } 81 Address nextPC = ebp.getAddressAt( 1 * ADDRESS_SIZE); 82 if (nextPC == null) { 83 return null; 84 } 85 return new BsdX86CFrame(dbg, nextEBP, nextPC); 86 } 87 88 private static final int ADDRESS_SIZE = 4; 89 private Address pc; 90 private Address ebp; 91 private BsdDebugger dbg; 92 } 93