1 /*
   2  * Copyright (c) 2003, 2012, 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.amd64;
  26 
  27 import sun.jvm.hotspot.debugger.*;
  28 import sun.jvm.hotspot.debugger.amd64.*;
  29 import sun.jvm.hotspot.debugger.bsd.*;
  30 import sun.jvm.hotspot.debugger.cdbg.*;
  31 import sun.jvm.hotspot.debugger.cdbg.basic.*;
  32 
  33 final public class BsdAMD64CFrame extends BasicCFrame {
  34    public BsdAMD64CFrame(BsdDebugger dbg, Address rbp, Address rip) {
  35       super(dbg.getCDebugger());
  36       this.rbp = rbp;
  37       this.rip = rip;
  38       this.dbg = dbg;
  39    }
  40 
  41    // override base class impl to avoid ELF parsing
  42    public ClosestSymbol closestSymbolToPC() {
  43       // try native lookup in debugger.
  44       return dbg.lookup(dbg.getAddressValue(pc()));
  45    }
  46 
  47    public Address pc() {
  48       return rip;
  49    }
  50 
  51    public Address localVariableBase() {
  52       return rbp;
  53    }
  54 
  55    public CFrame sender(ThreadProxy thread) {
  56       AMD64ThreadContext context = (AMD64ThreadContext) thread.getContext();
  57       Address rsp = context.getRegisterAsAddress(AMD64ThreadContext.RSP);
  58 
  59       if ( (rbp == null) || rbp.lessThan(rsp) ) {
  60         return null;
  61       }
  62 
  63       Address nextRBP = rbp.getAddressAt( 0 * ADDRESS_SIZE);
  64       if (nextRBP == null) {
  65         return null;
  66       }
  67       Address nextPC  = rbp.getAddressAt( 1 * ADDRESS_SIZE);
  68       if (nextPC == null) {
  69         return null;
  70       }
  71       return new BsdAMD64CFrame(dbg, nextRBP, nextPC);
  72    }
  73 
  74    // package/class internals only
  75    private static final int ADDRESS_SIZE = 8;
  76    private Address rip;
  77    private Address rbp;
  78    private BsdDebugger dbg;
  79 }