object_file.cc revision 8229:78bf55f23338 
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 <sys/mman.h>
33#include <sys/types.h>
34#include <fcntl.h>
35#include <unistd.h>
36
37#include <cstdio>
38#include <list>
39#include <string>
40
41#include "base/loader/aout_object.hh"
42#include "base/loader/ecoff_object.hh"
43#include "base/loader/elf_object.hh"
44#include "base/loader/object_file.hh"
45#include "base/loader/raw_object.hh"
46#include "base/loader/symtab.hh"
47#include "base/cprintf.hh"
48#include "mem/translating_port.hh"
49
50using namespace std;
51
52ObjectFile::ObjectFile(const string &_filename, int _fd,
53                       size_t _len, uint8_t *_data,
54                       Arch _arch, OpSys _opSys)
55    : filename(_filename), descriptor(_fd), fileData(_data), len(_len),
56      arch(_arch), opSys(_opSys)
57{
58}
59
60
61ObjectFile::~ObjectFile()
62{
63    close();
64}
65
66
67bool
68ObjectFile::loadSection(Section *sec, Port *memPort, Addr addrMask)
69{
70    if (sec->size != 0) {
71        Addr addr = sec->baseAddr & addrMask;
72        if (sec->fileImage) {
73            memPort->writeBlob(addr, sec->fileImage, sec->size);
74        }
75        else {
76            // no image: must be bss
77            memPort->memsetBlob(addr, 0, sec->size);
78        }
79    }
80    return true;
81}
82
83
84bool
85ObjectFile::loadSections(Port *memPort, Addr addrMask)
86{
87    return (loadSection(&text, memPort, addrMask)
88            && loadSection(&data, memPort, addrMask)
89            && loadSection(&bss, memPort, addrMask));
90}
91
92
93void
94ObjectFile::close()
95{
96    if (descriptor >= 0) {
97        ::close(descriptor);
98        descriptor = -1;
99    }
100
101    if (fileData) {
102        ::munmap((char*)fileData, len);
103        fileData = NULL;
104    }
105}
106
107
108ObjectFile *
109createObjectFile(const string &fname, bool raw)
110{
111    // open the file
112    int fd = open(fname.c_str(), O_RDONLY);
113    if (fd < 0) {
114        return NULL;
115    }
116
117    // find the length of the file by seeking to the end
118    size_t len = (size_t)lseek(fd, 0, SEEK_END);
119
120    // mmap the whole shebang
121    uint8_t *fileData =
122        (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
123    if (fileData == MAP_FAILED) {
124        close(fd);
125        return NULL;
126    }
127
128    ObjectFile *fileObj = NULL;
129
130    // figure out what we have here
131    if ((fileObj = EcoffObject::tryFile(fname, fd, len, fileData)) != NULL) {
132        return fileObj;
133    }
134
135    if ((fileObj = AoutObject::tryFile(fname, fd, len, fileData)) != NULL) {
136        return fileObj;
137    }
138
139    if ((fileObj = ElfObject::tryFile(fname, fd, len, fileData)) != NULL) {
140        return fileObj;
141    }
142
143    if (raw)
144        return RawObject::tryFile(fname, fd, len, fileData);
145
146    // don't know what it is
147    close(fd);
148    munmap((char*)fileData, len);
149    return NULL;
150}
151