src/base/loader/elf_object.hh

   1 /*
   2  * Copyright (c) 2013 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Copyright (c) 2003-2005 The Regents of The University of Michigan
  15  * All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions are
  19  * met: redistributions of source code must retain the above copyright
  20  * notice, this list of conditions and the following disclaimer;
  21  * redistributions in binary form must reproduce the above copyright
  22  * notice, this list of conditions and the following disclaimer in the
  23  * documentation and/or other materials provided with the distribution;
  24  * neither the name of the copyright holders nor the names of its
  25  * contributors may be used to endorse or promote products derived from
  26  * this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * Authors: Steve Reinhardt
  41  */
  42
  43 #ifndef __ELF_OBJECT_HH__
  44 #define __ELF_OBJECT_HH__
  45
  46 #include <set>
  47 #include <vector>
  48
  49 #include "base/loader/object_file.hh"
  50
  51 class ElfObject : public ObjectFile
  52 {
  53   protected:
  54
  55     //The global definition of a "Section" is closest to elf's segments.
  56     typedef ObjectFile::Section Segment;
  57
  58     //These values are provided to a linux process by the kernel, so we
  59     //need to keep them around.
  60     Addr _programHeaderTable;
  61     uint16_t _programHeaderSize;
  62     uint16_t _programHeaderCount;
  63     std::set<std::string> sectionNames;
  64
  65     /// Helper functions for loadGlobalSymbols() and loadLocalSymbols().
  66     bool loadSomeSymbols(SymbolTable *symtab, int binding, Addr mask);
  67
  68     ElfObject(const std::string &_filename, int _fd,
  69               size_t _len, uint8_t *_data,
  70               Arch _arch, OpSys _opSys);
  71
  72     void getSections();
  73     bool sectionExists(std::string sec);
  74
  75     std::vector<Segment> extraSegments;
  76
  77   public:
  78     virtual ~ElfObject() {}
  79
  80     bool loadSections(PortProxy& memProxy,
  81             Addr addrMask = std::numeric_limits<Addr>::max(),
  82             Addr offset = 0);
  83     virtual bool loadGlobalSymbols(SymbolTable *symtab, Addr addrMask =
  84             std::numeric_limits<Addr>::max());
  85     virtual bool loadLocalSymbols(SymbolTable *symtab, Addr addrMask =
  86             std::numeric_limits<Addr>::max());
  87     virtual bool loadWeakSymbols(SymbolTable *symtab, Addr addrMask =
  88             std::numeric_limits<Addr>::max());
  89
  90     virtual bool isDynamic() { return sectionExists(".interp"); }
  91     virtual bool hasTLS() { return sectionExists(".tbss"); }
  92
  93     static ObjectFile *tryFile(const std::string &fname, int fd,
  94                                size_t len, uint8_t *data);
  95     Addr programHeaderTable() {return _programHeaderTable;}
  96     uint16_t programHeaderSize() {return _programHeaderSize;}
  97     uint16_t programHeaderCount() {return _programHeaderCount;}
  98 };
  99
 100 #endif // __ELF_OBJECT_HH__