object_file.cc revision 2665:a124942bacb8 
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
49#include "mem/translating_port.hh"
50
51using namespace std;
52
53ObjectFile::ObjectFile(const string &_filename, int _fd,
54                       size_t _len, uint8_t *_data,
55                       Arch _arch, OpSys _opSys)
56    : filename(_filename), descriptor(_fd), fileData(_data), len(_len),
57      arch(_arch), opSys(_opSys)
58{
59}
60
61
62ObjectFile::~ObjectFile()
63{
64    close();
65}
66
67
68bool
69ObjectFile::loadSection(Section *sec, Port *memPort, Addr addrMask)
70{
71    if (sec->size != 0) {
72        Addr addr = sec->baseAddr & addrMask;
73        if (sec->fileImage) {
74            memPort->writeBlob(addr, sec->fileImage, sec->size);
75        }
76        else {
77            // no image: must be bss
78            memPort->memsetBlob(addr, 0, sec->size);
79        }
80    }
81    return true;
82}
83
84
85bool
86ObjectFile::loadSections(Port *memPort, Addr addrMask)
87{
88    return (loadSection(&text, memPort, addrMask)
89            && loadSection(&data, memPort, addrMask)
90            && loadSection(&bss, memPort, addrMask));
91}
92
93
94void
95ObjectFile::close()
96{
97    if (descriptor >= 0) {
98        ::close(descriptor);
99        descriptor = -1;
100    }
101
102    if (fileData) {
103        ::munmap(fileData, len);
104        fileData = NULL;
105    }
106}
107
108
109ObjectFile *
110createObjectFile(const string &fname)
111{
112    // open the file
113    int fd = open(fname.c_str(), O_RDONLY);
114    if (fd < 0) {
115        return NULL;
116    }
117
118    // find the length of the file by seeking to the end
119    size_t len = (size_t)lseek(fd, 0, SEEK_END);
120
121    // mmap the whole shebang
122    uint8_t *fileData =
123        (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
124    if (fileData == MAP_FAILED) {
125        close(fd);
126        return NULL;
127    }
128
129    ObjectFile *fileObj = NULL;
130
131    // figure out what we have here
132    if ((fileObj = EcoffObject::tryFile(fname, fd, len, fileData)) != NULL) {
133        return fileObj;
134    }
135
136    if ((fileObj = AoutObject::tryFile(fname, fd, len, fileData)) != NULL) {
137        return fileObj;
138    }
139
140    if ((fileObj = ElfObject::tryFile(fname, fd, len, fileData)) != NULL) {
141        return fileObj;
142    }
143
144    // don't know what it is
145    close(fd);
146    munmap(fileData, len);
147    return NULL;
148}
149