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
25package sun.jvm.hotspot.debugger.bsd.x86;
26
27import sun.jvm.hotspot.debugger.*;
28import sun.jvm.hotspot.debugger.bsd.*;
29import sun.jvm.hotspot.debugger.cdbg.*;
30import sun.jvm.hotspot.debugger.cdbg.basic.*;
31import sun.jvm.hotspot.debugger.x86.*;
32
33final public class BsdX86CFrame extends BasicCFrame {
34   // package/class internals only
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
43   public ClosestSymbol closestSymbolToPC() {
44      // try native lookup in debugger.
45      return dbg.lookup(dbg.getAddressValue(pc()));
46   }
47
48   public Address pc() {
49      return pc;
50   }
51
52   public Address localVariableBase() {
53      return ebp;
54   }
55
56   public CFrame sender(ThreadProxy thread) {
57      X86ThreadContext context = (X86ThreadContext) thread.getContext();
58      Address esp = context.getRegisterAsAddress(X86ThreadContext.ESP);
59
60      if ( (ebp == null) || ebp.lessThan(esp) ) {
61        return null;
62      }
63
64      Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE);
65      if (nextEBP == null) {
66        return null;
67      }
68      Address nextPC  = ebp.getAddressAt( 1 * ADDRESS_SIZE);
69      if (nextPC == null) {
70        return null;
71      }
72      return new BsdX86CFrame(dbg, nextEBP, nextPC);
73   }
74
75   private static final int ADDRESS_SIZE = 4;
76   private Address pc;
77   private Address ebp;
78   private BsdDebugger dbg;
79}
80