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 "base/cprintf.hh"
  39 #include "base/loader/object_file.hh"
  40 #include "base/loader/symtab.hh"
  41
  42 #include "base/loader/ecoff_object.hh"
  43 #include "base/loader/aout_object.hh"
  44 #include "base/loader/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                        Arch _arch, OpSys _opSys)
  51     : filename(_filename), descriptor(_fd), fileData(_data), len(_len),
  52       arch(_arch), opSys(_opSys)
  53 {
  54 }
  55
  56
  57 ObjectFile::~ObjectFile()
  58 {
  59     close();
  60 }
  61
  62
  63 void
  64 ObjectFile::close()
  65 {
  66     if (descriptor >= 0) {
  67         ::close(descriptor);
  68         descriptor = -1;
  69     }
  70
  71     if (fileData) {
  72         ::munmap(fileData, len);
  73         fileData = NULL;
  74     }
  75 }
  76
  77
  78 ObjectFile *
  79 createObjectFile(const string &fname)
  80 {
  81     // open the file
  82     int fd = open(fname.c_str(), O_RDONLY);
  83     if (fd < 0) {
  84         return NULL;
  85     }
  86
  87     // find the length of the file by seeking to the end
  88     size_t len = (size_t)lseek(fd, 0, SEEK_END);
  89
  90     // mmap the whole shebang
  91     uint8_t *fileData =
  92         (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
  93     if (fileData == MAP_FAILED) {
  94         close(fd);
  95         return NULL;
  96     }
  97
  98     ObjectFile *fileObj = NULL;
  99
 100     // figure out what we have here
 101     if ((fileObj = EcoffObject::tryFile(fname, fd, len, fileData)) != NULL) {
 102         return fileObj;
 103     }
 104
 105     if ((fileObj = AoutObject::tryFile(fname, fd, len, fileData)) != NULL) {
 106         return fileObj;
 107     }
 108
 109     if ((fileObj = ElfObject::tryFile(fname, fd, len, fileData)) != NULL) {
 110         return fileObj;
 111     }
 112
 113     // don't know what it is
 114     close(fd);
 115     munmap(fileData, len);
 116     return NULL;
 117 }