src/base/loader/elf_object.hh

/*
 * Copyright (c) 2013 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2003-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Steve Reinhardt
 */

#ifndef __ELF_OBJECT_HH__
#define __ELF_OBJECT_HH__

#include <set>
#include <vector>

#include "base/loader/object_file.hh"

class ElfObject : public ObjectFile
{
  protected:

    //The global definition of a "Section" is closest to elf's segments.
    typedef ObjectFile::Section Segment;

    //These values are provided to a linux process by the kernel, so we
    //need to keep them around.
    Addr _programHeaderTable;
    uint16_t _programHeaderSize;
    uint16_t _programHeaderCount;
    std::set<std::string> sectionNames;

    /// Helper functions for loadGlobalSymbols() and loadLocalSymbols().
    bool loadSomeSymbols(SymbolTable *symtab, int binding, Addr mask);

    ElfObject(const std::string &_filename, int _fd,
              size_t _len, uint8_t *_data,
              Arch _arch, OpSys _opSys);

    void getSections();
    bool sectionExists(std::string sec);

    std::vector<Segment> extraSegments;

  public:
    virtual ~ElfObject() {}

    bool loadSections(PortProxy& memProxy,
            Addr addrMask = std::numeric_limits<Addr>::max(),
            Addr offset = 0);
    virtual bool loadGlobalSymbols(SymbolTable *symtab, Addr addrMask =
            std::numeric_limits<Addr>::max());
    virtual bool loadLocalSymbols(SymbolTable *symtab, Addr addrMask =
            std::numeric_limits<Addr>::max());
    virtual bool loadWeakSymbols(SymbolTable *symtab, Addr addrMask =
            std::numeric_limits<Addr>::max());

    virtual bool isDynamic() { return sectionExists(".interp"); }
    virtual bool hasTLS() { return sectionExists(".tbss"); }

    static ObjectFile *tryFile(const std::string &fname, int fd,
                               size_t len, uint8_t *data);
    Addr programHeaderTable() {return _programHeaderTable;}
    uint16_t programHeaderSize() {return _programHeaderSize;}
    uint16_t programHeaderCount() {return _programHeaderCount;}
};

#endif // __ELF_OBJECT_HH__