src/base/loader/elf_object.hh

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