object_file.cc revision 2632:1bb2f91485ea
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 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#include "mem/translating_port.hh" 47 48using namespace std; 49 50ObjectFile::ObjectFile(const string &_filename, int _fd, 51 size_t _len, uint8_t *_data, 52 Arch _arch, OpSys _opSys) 53 : filename(_filename), descriptor(_fd), fileData(_data), len(_len), 54 arch(_arch), opSys(_opSys) 55{ 56} 57 58 59ObjectFile::~ObjectFile() 60{ 61 close(); 62} 63 64 65bool 66ObjectFile::loadSection(Section *sec, Port *memPort, Addr addrMask) 67{ 68 if (sec->size != 0) { 69 Addr addr = sec->baseAddr & addrMask; 70 if (sec->fileImage) { 71 memPort->writeBlob(addr, sec->fileImage, sec->size); 72 } 73 else { 74 // no image: must be bss 75 memPort->memsetBlob(addr, 0, sec->size); 76 } 77 } 78 return true; 79} 80 81 82bool 83ObjectFile::loadSections(Port *memPort, Addr addrMask) 84{ 85 return (loadSection(&text, memPort, addrMask) 86 && loadSection(&data, memPort, addrMask) 87 && loadSection(&bss, memPort, addrMask)); 88} 89 90 91void 92ObjectFile::close() 93{ 94 if (descriptor >= 0) { 95 ::close(descriptor); 96 descriptor = -1; 97 } 98 99 if (fileData) { 100 ::munmap(fileData, len); 101 fileData = NULL; 102 } 103} 104 105 106ObjectFile * 107createObjectFile(const string &fname) 108{ 109 // open the file 110 int fd = open(fname.c_str(), O_RDONLY); 111 if (fd < 0) { 112 return NULL; 113 } 114 115 // find the length of the file by seeking to the end 116 size_t len = (size_t)lseek(fd, 0, SEEK_END); 117 118 // mmap the whole shebang 119 uint8_t *fileData = 120 (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 121 if (fileData == MAP_FAILED) { 122 close(fd); 123 return NULL; 124 } 125 126 ObjectFile *fileObj = NULL; 127 128 // figure out what we have here 129 if ((fileObj = EcoffObject::tryFile(fname, fd, len, fileData)) != NULL) { 130 return fileObj; 131 } 132 133 if ((fileObj = AoutObject::tryFile(fname, fd, len, fileData)) != NULL) { 134 return fileObj; 135 } 136 137 if ((fileObj = ElfObject::tryFile(fname, fd, len, fileData)) != NULL) { 138 return fileObj; 139 } 140 141 // don't know what it is 142 close(fd); 143 munmap(fileData, len); 144 return NULL; 145} 146