object_file.cc revision 3584:8c3cdb2c001c 
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 * Authors: Nathan Binkert
29 *          Steve Reinhardt
30 */
31
32#include <list>
33#include <string>
34
35#include <sys/types.h>
36#include <sys/mman.h>
37#include <fcntl.h>
38#include <stdio.h>
39#include <unistd.h>
40
41#include "base/cprintf.hh"
42#include "base/loader/object_file.hh"
43#include "base/loader/symtab.hh"
44
45#include "base/loader/ecoff_object.hh"
46#include "base/loader/aout_object.hh"
47#include "base/loader/elf_object.hh"
48#include "base/loader/raw_object.hh"
49
50#include "mem/translating_port.hh"
51
52using namespace std;
53
54ObjectFile::ObjectFile(const string &_filename, int _fd,
55                       size_t _len, uint8_t *_data,
56                       Arch _arch, OpSys _opSys)
57    : filename(_filename), descriptor(_fd), fileData(_data), len(_len),
58      arch(_arch), opSys(_opSys)
59{
60}
61
62
63ObjectFile::~ObjectFile()
64{
65    close();
66}
67
68
69bool
70ObjectFile::loadSection(Section *sec, Port *memPort, Addr addrMask)
71{
72    if (sec->size != 0) {
73        Addr addr = sec->baseAddr & addrMask;
74        if (sec->fileImage) {
75            memPort->writeBlob(addr, sec->fileImage, sec->size);
76        }
77        else {
78            // no image: must be bss
79            memPort->memsetBlob(addr, 0, sec->size);
80        }
81    }
82    return true;
83}
84
85
86bool
87ObjectFile::loadSections(Port *memPort, Addr addrMask)
88{
89    return (loadSection(&text, memPort, addrMask)
90            && loadSection(&data, memPort, addrMask)
91            && loadSection(&bss, memPort, addrMask));
92}
93
94
95void
96ObjectFile::close()
97{
98    if (descriptor >= 0) {
99        ::close(descriptor);
100        descriptor = -1;
101    }
102
103    if (fileData) {
104        ::munmap(fileData, len);
105        fileData = NULL;
106    }
107}
108
109
110ObjectFile *
111createObjectFile(const string &fname, bool raw)
112{
113    // open the file
114    int fd = open(fname.c_str(), O_RDONLY);
115    if (fd < 0) {
116        return NULL;
117    }
118
119    // find the length of the file by seeking to the end
120    size_t len = (size_t)lseek(fd, 0, SEEK_END);
121
122    // mmap the whole shebang
123    uint8_t *fileData =
124        (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
125    if (fileData == MAP_FAILED) {
126        close(fd);
127        return NULL;
128    }
129
130    ObjectFile *fileObj = NULL;
131
132    // figure out what we have here
133    if ((fileObj = EcoffObject::tryFile(fname, fd, len, fileData)) != NULL) {
134        return fileObj;
135    }
136
137    if ((fileObj = AoutObject::tryFile(fname, fd, len, fileData)) != NULL) {
138        return fileObj;
139    }
140
141    if ((fileObj = ElfObject::tryFile(fname, fd, len, fileData)) != NULL) {
142        return fileObj;
143    }
144
145    if (raw)
146        return RawObject::tryFile(fname, fd, len, fileData);
147
148    // don't know what it is
149    close(fd);
150    munmap(fileData, len);
151    return NULL;
152}
153