001 // This file is part of the program FRYSK.
002 //
003 // Copyright 2007, 2008 Red Hat Inc.
004 //
005 // FRYSK is free software; you can redistribute it and/or modify it
006 // under the terms of the GNU General Public License as published by
007 // the Free Software Foundation; version 2 of the License.
008 //
009 // FRYSK is distributed in the hope that it will be useful, but
010 // WITHOUT ANY WARRANTY; without even the implied warranty of
011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 // General Public License for more details.
013 //
014 // You should have received a copy of the GNU General Public License
015 // along with FRYSK; if not, write to the Free Software Foundation,
016 // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
017 //
018 // In addition, as a special exception, Red Hat, Inc. gives You the
019 // additional right to link the code of FRYSK with code not covered
020 // under the GNU General Public License ("Non-GPL Code") and to
021 // distribute linked combinations including the two, subject to the
022 // limitations in this paragraph. Non-GPL Code permitted under this
023 // exception must only link to the code of FRYSK through those well
024 // defined interfaces identified in the file named EXCEPTION found in
025 // the source code files (the "Approved Interfaces"). The files of
026 // Non-GPL Code may instantiate templates or use macros or inline
027 // functions from the Approved Interfaces without causing the
028 // resulting work to be covered by the GNU General Public
029 // License. Only Red Hat, Inc. may make changes or additions to the
030 // list of Approved Interfaces. You must obey the GNU General Public
031 // License in all respects for all of the FRYSK code and other code
032 // used in conjunction with FRYSK except the Non-GPL Code covered by
033 // this exception. If you modify this file, you may extend this
034 // exception to your version of the file, but you are not obligated to
035 // do so. If you do not wish to provide this exception without
036 // modification, you must delete this exception statement from your
037 // version and license this file solely under the GPL without
038 // exception.
039
040 package frysk.proc.dead;
041
042 import lib.dwfl.ElfPrstatus;
043 import lib.dwfl.ElfPrFPRegSet;
044 import lib.dwfl.ElfPrXFPRegSet;
045 import inua.eio.ByteBuffer;
046 import inua.eio.ArrayByteBuffer;
047 import inua.eio.ByteOrder;
048 import frysk.isa.ISA;
049 import frysk.isa.banks.RegisterBanks;
050 import frysk.isa.registers.RegistersFactory;
051 import frysk.rsl.Log;
052
053 public class LinuxCoreTask extends DeadTask {
054
055 private static final Log fine = Log.fine(LinuxCoreTask.class);
056 private final LinuxCoreProc parent;
057
058 public ByteBuffer getMemory() {
059 // XXX: Get the Proc's memory (memory maps). Task and register
060 // information is handled differently (through notes) in core
061 // files. There's a potential here for task to have its own
062 // memory maps in some architectures, but not in the current
063 // ISAs. In an attempt to save system resources, get a
064 // reference to the proc's maps for now.
065
066 fine.log(this,"getMemory() called by ",Log.CALLER);
067 return parent.getMemory();
068 }
069
070 static private RegisterBanks simulateRegisterBanks(ElfPrstatus elfTask,
071 ElfPrFPRegSet elfFPRegs,
072 ElfPrXFPRegSet elfXFPRegs,
073 ISA isa) {
074 // XXX: Potentially this information should be constructed in
075 // CorefileRegisterBanksFactory. However that would require
076 // the factory to know about elf constructs which is not
077 // desirable.
078 ByteBuffer[] bankBuffers = new ByteBuffer[4];
079
080 // Create an empty page
081 byte[] emptyBuffer = new byte[4096];
082 for (int i=0; i<emptyBuffer.length; i++)
083 emptyBuffer[i]=0;
084
085 // Get ISA specific data
086 ByteOrder byteOrder = isa.order();
087 int wordSize = isa.wordSize();
088
089 // Set GP Registers
090 bankBuffers[0] = new ArrayByteBuffer(elfTask.getRawCoreRegisters());
091 bankBuffers[0].order(byteOrder);
092 bankBuffers[0].wordSize(wordSize);
093
094 // The following register banks are either fake (blank page) or
095 // actual core data. As corefiles may or may not contain various
096 // parts of register data, and there is an expectation throughout
097 // Frysk that each task will always provide register data
098 // regardless, we have to preset an empty page to avoid NPEs.
099
100 // If Floating Point Register are present
101 if (elfFPRegs != null)
102 bankBuffers[1] = new ArrayByteBuffer(elfFPRegs.getFPRegisterBuffer());
103 else
104 bankBuffers[1] = new ArrayByteBuffer(emptyBuffer);
105
106 bankBuffers[1].order(byteOrder);
107 bankBuffers[1].wordSize(wordSize);
108
109 // If X Floating Point Register are present
110 if (elfXFPRegs != null)
111 bankBuffers[2] = new ArrayByteBuffer(elfXFPRegs.getXFPRegisterBuffer());
112 else
113 bankBuffers[2] = new ArrayByteBuffer(emptyBuffer);
114
115 bankBuffers[2].order(byteOrder);
116 bankBuffers[2].wordSize(wordSize);
117
118 // XXX: Other register banks need to be filled in.
119 bankBuffers[3] = new ArrayByteBuffer(emptyBuffer);
120
121 return CorefileRegisterBanksFactory.create(isa, bankBuffers);
122 }
123
124 /**
125 * Create a new unattached Task.
126 */
127 LinuxCoreTask(LinuxCoreProc proc, ElfPrstatus elfTask, ElfPrFPRegSet
128 elfFPRegs, ElfPrXFPRegSet elfXFPRegs, ISA isa) {
129 super(proc, elfTask.getPrPid(), isa,
130 simulateRegisterBanks(elfTask, elfFPRegs, elfXFPRegs, isa));
131 this.parent = proc;
132 }
133
134 public long getPC() {
135 return getRegister(RegistersFactory
136 .getRegisters(getISA())
137 .getProgramCounter());
138 }
139 }