object_file.cc revision 360
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 46using namespace std; 47 48ObjectFile::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 57ObjectFile::~ObjectFile() 58{ 59 close(); 60} 61 62 63void 64ObjectFile::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 78ObjectFile * 79createObjectFile(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} 118