elf_object.hh revision 7581:692cdb71febd 
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
38class 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, Addr mask);
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__
85