LinuxPPC64CFrame.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.debugger.linux.ppc64;

import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.ppc64.*;
import sun.jvm.hotspot.debugger.linux.*;
import sun.jvm.hotspot.debugger.cdbg.*;
import sun.jvm.hotspot.debugger.cdbg.basic.*;

final public class LinuxPPC64CFrame extends BasicCFrame {
  // package/class internals only

  public LinuxPPC64CFrame(LinuxDebugger dbg, Address sp, Address pc, int address_size) {
    super(dbg.getCDebugger());
    this.sp = sp;
    this.pc = pc;
    this.dbg = dbg;
    this.address_size = address_size;
  }

  // override base class impl to avoid ELF parsing
  public ClosestSymbol closestSymbolToPC() {
    // try native lookup in debugger.
    return dbg.lookup(dbg.getAddressValue(pc()));
  }

  public Address pc() {
    return pc;
  }

  public Address localVariableBase() {
    return sp;
  }

  public CFrame sender(ThreadProxy thread) {
    if (sp == null) {
      return null;
    }

    Address nextSP = sp.getAddressAt(0);
    if (nextSP == null) {
      return null;
    }
    Address nextPC  = sp.getAddressAt(2 * address_size);
    if (nextPC == null) {
      return null;
    }
    return new LinuxPPC64CFrame(dbg, nextSP, nextPC, address_size);
  }

  public static int PPC64_STACK_BIAS = 0;
  private static int address_size;
  private Address pc;
  private Address sp;
  private LinuxDebugger dbg;
}