object_file.cc revision 10422 
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/dtb_object.hh"
43#include "base/loader/ecoff_object.hh"
44#include "base/loader/elf_object.hh"
45#include "base/loader/object_file.hh"
46#include "base/loader/raw_object.hh"
47#include "base/loader/symtab.hh"
48#include "base/cprintf.hh"
49#include "mem/port_proxy.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), entry(0), globalPtr(0),
58      text{0, nullptr, 0}, data{0, nullptr, 0}, bss{0, nullptr, 0}
59{
60}
61
62
63ObjectFile::~ObjectFile()
64{
65    close();
66}
67
68
69bool
70ObjectFile::loadSection(Section *sec, PortProxy& memProxy, Addr addrMask, Addr offset)
71{
72    if (sec->size != 0) {
73        Addr addr = (sec->baseAddr & addrMask) + offset;
74        if (sec->fileImage) {
75            memProxy.writeBlob(addr, sec->fileImage, sec->size);
76        }
77        else {
78            // no image: must be bss
79            memProxy.memsetBlob(addr, 0, sec->size);
80        }
81    }
82    return true;
83}
84
85
86bool
87ObjectFile::loadSections(PortProxy& memProxy, Addr addrMask, Addr offset)
88{
89    return (loadSection(&text, memProxy, addrMask, offset)
90            && loadSection(&data, memProxy, addrMask, offset)
91            && loadSection(&bss, memProxy, addrMask, offset));
92}
93
94
95void
96ObjectFile::close()
97{
98    if (descriptor >= 0) {
99        ::close(descriptor);
100        descriptor = -1;
101    }
102
103    if (fileData) {
104        ::munmap((char*)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    off_t off = lseek(fd, 0, SEEK_END);
121    fatal_if(off < 0, "Failed to determine size of object file %s\n", fname);
122    size_t len = static_cast<size_t>(off);
123
124    // mmap the whole shebang
125    uint8_t *fileData =
126        (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
127    if (fileData == MAP_FAILED) {
128        close(fd);
129        return NULL;
130    }
131
132    ObjectFile *fileObj = NULL;
133
134    // figure out what we have here
135    if ((fileObj = EcoffObject::tryFile(fname, fd, len, fileData)) != NULL) {
136        return fileObj;
137    }
138
139    if ((fileObj = AoutObject::tryFile(fname, fd, len, fileData)) != NULL) {
140        return fileObj;
141    }
142
143    if ((fileObj = ElfObject::tryFile(fname, fd, len, fileData)) != NULL) {
144        return fileObj;
145    }
146
147    if ((fileObj = DtbObject::tryFile(fname, fd, len, fileData)) != NULL) {
148        return fileObj;
149    }
150
151    if (raw)
152        return RawObject::tryFile(fname, fd, len, fileData);
153
154    // don't know what it is
155    close(fd);
156    munmap((char*)fileData, len);
157    return NULL;
158}
159