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1 /*
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2 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.debugger.linux.x86;
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26
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27 import sun.jvm.hotspot.debugger.*;
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28 import sun.jvm.hotspot.debugger.linux.*;
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29 import sun.jvm.hotspot.debugger.cdbg.*;
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30 import sun.jvm.hotspot.debugger.cdbg.basic.*;
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31
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32 final public class LinuxX86CFrame extends BasicCFrame {
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33 // package/class internals only
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34 public LinuxX86CFrame(LinuxDebugger dbg, Address ebp, Address pc) {
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35 super(dbg.getCDebugger());
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36 this.ebp = ebp;
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37 this.pc = pc;
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38 this.dbg = dbg;
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39 }
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40
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41 // override base class impl to avoid ELF parsing
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42 public ClosestSymbol closestSymbolToPC() {
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43 // try native lookup in debugger.
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44 return dbg.lookup(dbg.getAddressValue(pc()));
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45 }
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46
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47 public Address pc() {
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48 return pc;
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49 }
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50
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51 public Address localVariableBase() {
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52 return ebp;
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53 }
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54
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55 public CFrame sender() {
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56 if (ebp == null) {
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57 return null;
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58 }
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59
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60 Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE);
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61 if (nextEBP == null) {
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62 return null;
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63 }
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64 Address nextPC = ebp.getAddressAt( 1 * ADDRESS_SIZE);
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65 if (nextPC == null) {
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66 return null;
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67 }
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68 return new LinuxX86CFrame(dbg, nextEBP, nextPC);
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69 }
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70
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71 private static final int ADDRESS_SIZE = 4;
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72 private Address pc;
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73 private Address ebp;
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74 private LinuxDebugger dbg;
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75 }
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