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
25package sun.jvm.hotspot.debugger.windows.x86;
26
27import sun.jvm.hotspot.debugger.*;
28import sun.jvm.hotspot.debugger.x86.*;
29import sun.jvm.hotspot.debugger.cdbg.*;
30import sun.jvm.hotspot.debugger.cdbg.basic.*;
31import sun.jvm.hotspot.debugger.windbg.*;
32
33public 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 */
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
47  public CFrame sender(ThreadProxy thread) {
48    X86ThreadContext context = (X86ThreadContext) thread.getContext();
49    Address esp = context.getRegisterAsAddress(X86ThreadContext.ESP);
50
51    if ( (ebp == null) || ebp.lessThan(esp) ) {
52      return null;
53    }
54
55    // Check alignment of ebp
56    if ( dbg.getAddressValue(ebp) % ADDRESS_SIZE != 0) {
57        return null;
58    }
59
60    Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE);
61    if (nextEBP == null || nextEBP.lessThanOrEqual(ebp)) {
62      return null;
63    }
64    Address nextPC  = ebp.getAddressAt( 1 * ADDRESS_SIZE);
65    if (nextPC == null) {
66      return null;
67    }
68    return new WindowsX86CFrame(dbg, nextEBP, nextPC);
69  }
70
71  public Address pc() {
72    return pc;
73  }
74
75  public Address localVariableBase() {
76    return ebp;
77  }
78
79  private WindbgDebugger dbg;
80}
81