12754fe60SDimitry Andric //===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===// 22754fe60SDimitry Andric // 32754fe60SDimitry Andric // The LLVM Compiler Infrastructure 42754fe60SDimitry Andric // 52754fe60SDimitry Andric // This file is distributed under the University of Illinois Open Source 62754fe60SDimitry Andric // License. See LICENSE.TXT for details. 72754fe60SDimitry Andric // 82754fe60SDimitry Andric //===----------------------------------------------------------------------===// 92754fe60SDimitry Andric // 10dff0c46cSDimitry Andric // Part of the ELFObjectFile class implementation. 112754fe60SDimitry Andric // 122754fe60SDimitry Andric //===----------------------------------------------------------------------===// 132754fe60SDimitry Andric 14f785676fSDimitry Andric #include "llvm/Object/ELFObjectFile.h" 15139f7f9bSDimitry Andric #include "llvm/Support/MathExtras.h" 162754fe60SDimitry Andric 17dff0c46cSDimitry Andric namespace llvm { 182754fe60SDimitry Andric using namespace object; 192754fe60SDimitry Andric 20dff0c46cSDimitry Andric // Creates an in-memory object-file by default: createELFObjectFile(Buffer) 212754fe60SDimitry Andric ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) { 222754fe60SDimitry Andric std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); 2317a519f9SDimitry Andric error_code ec; 24dff0c46cSDimitry Andric 25139f7f9bSDimitry Andric std::size_t MaxAlignment = 26f785676fSDimitry Andric 1ULL << countTrailingZeros(uintptr_t(Object->getBufferStart())); 27139f7f9bSDimitry Andric 282754fe60SDimitry Andric if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) 29139f7f9bSDimitry Andric #if !LLVM_IS_UNALIGNED_ACCESS_FAST 30139f7f9bSDimitry Andric if (MaxAlignment >= 4) 31139f7f9bSDimitry Andric return new ELFObjectFile<ELFType<support::little, 4, false> >(Object, ec); 32139f7f9bSDimitry Andric else 33139f7f9bSDimitry Andric #endif 34139f7f9bSDimitry Andric if (MaxAlignment >= 2) 35139f7f9bSDimitry Andric return new ELFObjectFile<ELFType<support::little, 2, false> >(Object, ec); 36139f7f9bSDimitry Andric else 37139f7f9bSDimitry Andric llvm_unreachable("Invalid alignment for ELF file!"); 382754fe60SDimitry Andric else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) 39139f7f9bSDimitry Andric #if !LLVM_IS_UNALIGNED_ACCESS_FAST 40139f7f9bSDimitry Andric if (MaxAlignment >= 4) 41139f7f9bSDimitry Andric return new ELFObjectFile<ELFType<support::big, 4, false> >(Object, ec); 42139f7f9bSDimitry Andric else 43139f7f9bSDimitry Andric #endif 44139f7f9bSDimitry Andric if (MaxAlignment >= 2) 45139f7f9bSDimitry Andric return new ELFObjectFile<ELFType<support::big, 2, false> >(Object, ec); 46139f7f9bSDimitry Andric else 47139f7f9bSDimitry Andric llvm_unreachable("Invalid alignment for ELF file!"); 482754fe60SDimitry Andric else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) 49139f7f9bSDimitry Andric #if !LLVM_IS_UNALIGNED_ACCESS_FAST 50139f7f9bSDimitry Andric if (MaxAlignment >= 8) 51139f7f9bSDimitry Andric return new ELFObjectFile<ELFType<support::big, 8, true> >(Object, ec); 52139f7f9bSDimitry Andric else 53139f7f9bSDimitry Andric #endif 54139f7f9bSDimitry Andric if (MaxAlignment >= 2) 55139f7f9bSDimitry Andric return new ELFObjectFile<ELFType<support::big, 2, true> >(Object, ec); 56139f7f9bSDimitry Andric else 57139f7f9bSDimitry Andric llvm_unreachable("Invalid alignment for ELF file!"); 58dff0c46cSDimitry Andric else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { 59139f7f9bSDimitry Andric #if !LLVM_IS_UNALIGNED_ACCESS_FAST 60139f7f9bSDimitry Andric if (MaxAlignment >= 8) 61139f7f9bSDimitry Andric return new ELFObjectFile<ELFType<support::little, 8, true> >(Object, ec); 62139f7f9bSDimitry Andric else 63139f7f9bSDimitry Andric #endif 64139f7f9bSDimitry Andric if (MaxAlignment >= 2) 65139f7f9bSDimitry Andric return new ELFObjectFile<ELFType<support::little, 2, true> >(Object, ec); 66139f7f9bSDimitry Andric else 67139f7f9bSDimitry Andric llvm_unreachable("Invalid alignment for ELF file!"); 68dff0c46cSDimitry Andric } 69dff0c46cSDimitry Andric 70dff0c46cSDimitry Andric report_fatal_error("Buffer is not an ELF object file!"); 712754fe60SDimitry Andric } 722754fe60SDimitry Andric 732754fe60SDimitry Andric } // end namespace llvm 74