1 /*
   2  * Copyright (c) 2006, 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,
  20  * CA 94065 USA or visit www.oracle.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.debugger.linux.sparc;
  26 
  27 import sun.jvm.hotspot.debugger.*;
  28 import sun.jvm.hotspot.debugger.sparc.*;
  29 import sun.jvm.hotspot.debugger.linux.*;
  30 import sun.jvm.hotspot.debugger.cdbg.*;
  31 import sun.jvm.hotspot.debugger.cdbg.basic.*;
  32 
  33 final public class LinuxSPARCCFrame extends BasicCFrame {
  34    // package/class internals only
  35 
  36    public LinuxSPARCCFrame(LinuxDebugger dbg, Address sp, Address pc, int address_size) {
  37       super(dbg.getCDebugger());
  38       this.sp = sp;
  39       this.pc = pc;
  40       this.dbg = dbg;
  41       this.address_size=address_size;
  42       if (address_size==8) SPARC_STACK_BIAS = 0x7ff;
  43       else SPARC_STACK_BIAS = 0x0;
  44    }
  45 
  46    // override base class impl to avoid ELF parsing
  47    public ClosestSymbol closestSymbolToPC() {
  48       // try native lookup in debugger.
  49       return dbg.lookup(dbg.getAddressValue(pc()));
  50    }
  51 
  52    public Address pc() {
  53       return     pc;
  54    }
  55 
  56    public Address localVariableBase() {
  57       return sp;
  58    }
  59 
  60    public CFrame sender() {
  61       if (sp == null) {
  62         return null;
  63       }
  64 
  65       Address nextSP = sp.getAddressAt( SPARCThreadContext.R_SP * address_size + SPARC_STACK_BIAS);
  66       if (nextSP == null) {
  67         return null;
  68       }
  69       Address nextPC  = sp.getAddressAt(SPARCThreadContext.R_O7 * address_size + SPARC_STACK_BIAS);
  70       if (nextPC == null) {
  71         return null;
  72       }
  73       return new LinuxSPARCCFrame(dbg, nextSP, nextPC,address_size);
  74    }
  75 
  76    public static int SPARC_STACK_BIAS;
  77    private static int address_size;
  78    private Address pc;
  79    private Address sp;
  80    private LinuxDebugger dbg;
  81 }