object_file.cc revision 1762 
1/*
2 * Copyright (c) 2002-2004 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
29#include <list>
30#include <string>
31
32#include <sys/types.h>
33#include <sys/mman.h>
34#include <fcntl.h>
35#include <stdio.h>
36#include <unistd.h>
37
38#include "base/cprintf.hh"
39#include "base/loader/object_file.hh"
40#include "base/loader/symtab.hh"
41
42#include "base/loader/ecoff_object.hh"
43#include "base/loader/aout_object.hh"
44#include "base/loader/elf_object.hh"
45
46using namespace std;
47
48ObjectFile::ObjectFile(const string &_filename, int _fd,
49                       size_t _len, uint8_t *_data,
50                       Arch _arch, OpSys _opSys)
51    : filename(_filename), descriptor(_fd), fileData(_data), len(_len),
52      arch(_arch), opSys(_opSys)
53{
54}
55
56
57ObjectFile::~ObjectFile()
58{
59    close();
60}
61
62
63void
64ObjectFile::close()
65{
66    if (descriptor >= 0) {
67        ::close(descriptor);
68        descriptor = -1;
69    }
70
71    if (fileData) {
72        ::munmap(fileData, len);
73        fileData = NULL;
74    }
75}
76
77
78ObjectFile *
79createObjectFile(const string &fname)
80{
81    // open the file
82    int fd = open(fname.c_str(), O_RDONLY);
83    if (fd < 0) {
84        return NULL;
85    }
86
87    // find the length of the file by seeking to the end
88    size_t len = (size_t)lseek(fd, 0, SEEK_END);
89
90    // mmap the whole shebang
91    uint8_t *fileData =
92        (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
93    if (fileData == MAP_FAILED) {
94        close(fd);
95        return NULL;
96    }
97
98    ObjectFile *fileObj = NULL;
99
100    // figure out what we have here
101    if ((fileObj = EcoffObject::tryFile(fname, fd, len, fileData)) != NULL) {
102        return fileObj;
103    }
104
105    if ((fileObj = AoutObject::tryFile(fname, fd, len, fileData)) != NULL) {
106        return fileObj;
107    }
108
109    if ((fileObj = ElfObject::tryFile(fname, fd, len, fileData)) != NULL) {
110        return fileObj;
111    }
112
113    // don't know what it is
114    close(fd);
115    munmap(fileData, len);
116    return NULL;
117}
118