src/base/loader/object_file.cc

   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
  50 using namespace std;
  51
  52 ObjectFile::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
  61 ObjectFile::~ObjectFile()
  62 {
  63     close();
  64 }
  65
  66
  67 bool
  68 ObjectFile::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
  84 bool
  85 ObjectFile::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
  93 void
  94 ObjectFile::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
 108 ObjectFile *
 109 createObjectFile(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 }