base/loader/object_file.cc

   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
  46 using namespace std;
  47
  48 ObjectFile::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
  55 ObjectFile::~ObjectFile()
  56 {
  57     close();
  58 }
  59
  60
  61 void
  62 ObjectFile::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
  76 ObjectFile *
  77 createObjectFile(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 }