object_file.cc revision 12 
1/*
2 * Copyright (c) 2003 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 "cprintf.hh"
39#include "object_file.hh"
40#include "symtab.hh"
41
42#include "ecoff_object.hh"
43#include "aout_object.hh"
44#include "elf_object.hh"
45
46using namespace std;
47
48ObjectFile::ObjectFile(const string &_filename, int _fd,
49                       size_t _len, uint8_t *_data)
50    : filename(_filename), descriptor(_fd), fileData(_data), len(_len)
51{
52}
53
54
55ObjectFile::~ObjectFile()
56{
57    close();
58}
59
60
61void
62ObjectFile::close()
63{
64    if (descriptor >= 0) {
65        ::close(descriptor);
66        descriptor = -1;
67    }
68
69    if (fileData) {
70        ::munmap(fileData, len);
71        fileData = NULL;
72    }
73}
74
75
76ObjectFile *
77createObjectFile(const string &fname)
78{
79    // open the file
80    int fd = open(fname.c_str(), O_RDONLY);
81    if (fd < 0) {
82        return NULL;
83    }
84
85    // find the length of the file by seeking to the end
86    size_t len = (size_t)lseek(fd, 0, SEEK_END);
87
88    // mmap the whole shebang
89    uint8_t *fileData =
90        (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
91    if (fileData == MAP_FAILED) {
92        close(fd);
93        return NULL;
94    }
95
96    ObjectFile *fileObj = NULL;
97
98    // figure out what we have here
99    if ((fileObj = EcoffObject::tryFile(fname, fd, len, fileData)) != NULL) {
100        return fileObj;
101    }
102
103    if ((fileObj = AoutObject::tryFile(fname, fd, len, fileData)) != NULL) {
104        return fileObj;
105    }
106
107    if ((fileObj = ElfObject::tryFile(fname, fd, len, fileData)) != NULL) {
108        return fileObj;
109    }
110
111    // don't know what it is
112    close(fd);
113    munmap(fileData, len);
114    return NULL;
115}
116