elf_object.hh revision 9641:2285b98847d7 
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 <set>
35#include <vector>
36
37#include "base/loader/object_file.hh"
38
39class ElfObject : public ObjectFile
40{
41  protected:
42
43    //The global definition of a "Section" is closest to elf's segments.
44    typedef ObjectFile::Section Segment;
45
46    //These values are provided to a linux process by the kernel, so we
47    //need to keep them around.
48    Addr _programHeaderTable;
49    uint16_t _programHeaderSize;
50    uint16_t _programHeaderCount;
51    std::set<std::string> sectionNames;
52
53    /// Helper functions for loadGlobalSymbols() and loadLocalSymbols().
54    bool loadSomeSymbols(SymbolTable *symtab, int binding, Addr mask);
55
56    ElfObject(const std::string &_filename, int _fd,
57              size_t _len, uint8_t *_data,
58              Arch _arch, OpSys _opSys);
59
60    void getSections();
61    bool sectionExists(std::string sec);
62
63    std::vector<Segment> extraSegments;
64
65  public:
66    virtual ~ElfObject() {}
67
68    bool loadSections(PortProxy& memProxy,
69            Addr addrMask = std::numeric_limits<Addr>::max());
70    virtual bool loadGlobalSymbols(SymbolTable *symtab, Addr addrMask =
71            std::numeric_limits<Addr>::max());
72    virtual bool loadLocalSymbols(SymbolTable *symtab, Addr addrMask =
73            std::numeric_limits<Addr>::max());
74    virtual bool loadWeakSymbols(SymbolTable *symtab, Addr addrMask =
75            std::numeric_limits<Addr>::max());
76
77    virtual bool isDynamic() { return sectionExists(".interp"); }
78    virtual bool hasTLS() { return sectionExists(".tbss"); }
79
80    static ObjectFile *tryFile(const std::string &fname, int fd,
81                               size_t len, uint8_t *data);
82    Addr programHeaderTable() {return _programHeaderTable;}
83    uint16_t programHeaderSize() {return _programHeaderSize;}
84    uint16_t programHeaderCount() {return _programHeaderCount;}
85};
86
87#endif // __ELF_OBJECT_HH__
88