1 //===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Part of the ELFObjectFile class implementation. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Object/ELFObjectFile.h" 15 #include "llvm/Support/MathExtras.h" 16 17 namespace llvm { 18 using namespace object; 19 20 ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source) 21 : ObjectFile(Type, Source) {} 22 23 ErrorOr<std::unique_ptr<ObjectFile>> 24 ObjectFile::createELFObjectFile(MemoryBufferRef Obj) { 25 std::pair<unsigned char, unsigned char> Ident = 26 getElfArchType(Obj.getBuffer()); 27 std::size_t MaxAlignment = 28 1ULL << countTrailingZeros(uintptr_t(Obj.getBufferStart())); 29 30 if (MaxAlignment < 2) 31 return object_error::parse_failed; 32 33 std::error_code EC; 34 std::unique_ptr<ObjectFile> R; 35 if (Ident.first == ELF::ELFCLASS32) { 36 if (Ident.second == ELF::ELFDATA2LSB) 37 R.reset(new ELFObjectFile<ELFType<support::little, false>>(Obj, EC)); 38 else if (Ident.second == ELF::ELFDATA2MSB) 39 R.reset(new ELFObjectFile<ELFType<support::big, false>>(Obj, EC)); 40 else 41 return object_error::parse_failed; 42 } else if (Ident.first == ELF::ELFCLASS64) { 43 if (Ident.second == ELF::ELFDATA2LSB) 44 R.reset(new ELFObjectFile<ELFType<support::little, true>>(Obj, EC)); 45 else if (Ident.second == ELF::ELFDATA2MSB) 46 R.reset(new ELFObjectFile<ELFType<support::big, true>>(Obj, EC)); 47 else 48 return object_error::parse_failed; 49 } else { 50 return object_error::parse_failed; 51 } 52 53 if (EC) 54 return EC; 55 return std::move(R); 56 } 57 58 SubtargetFeatures ELFObjectFileBase::getFeatures() const { 59 switch (getEMachine()) { 60 case ELF::EM_MIPS: { 61 SubtargetFeatures Features; 62 unsigned PlatformFlags; 63 getPlatformFlags(PlatformFlags); 64 65 switch (PlatformFlags & ELF::EF_MIPS_ARCH) { 66 case ELF::EF_MIPS_ARCH_1: 67 break; 68 case ELF::EF_MIPS_ARCH_2: 69 Features.AddFeature("mips2"); 70 break; 71 case ELF::EF_MIPS_ARCH_3: 72 Features.AddFeature("mips3"); 73 break; 74 case ELF::EF_MIPS_ARCH_4: 75 Features.AddFeature("mips4"); 76 break; 77 case ELF::EF_MIPS_ARCH_5: 78 Features.AddFeature("mips5"); 79 break; 80 case ELF::EF_MIPS_ARCH_32: 81 Features.AddFeature("mips32"); 82 break; 83 case ELF::EF_MIPS_ARCH_64: 84 Features.AddFeature("mips64"); 85 break; 86 case ELF::EF_MIPS_ARCH_32R2: 87 Features.AddFeature("mips32r2"); 88 break; 89 case ELF::EF_MIPS_ARCH_64R2: 90 Features.AddFeature("mips64r2"); 91 break; 92 case ELF::EF_MIPS_ARCH_32R6: 93 Features.AddFeature("mips32r6"); 94 break; 95 case ELF::EF_MIPS_ARCH_64R6: 96 Features.AddFeature("mips64r6"); 97 break; 98 default: 99 llvm_unreachable("Unknown EF_MIPS_ARCH value"); 100 } 101 102 switch (PlatformFlags & ELF::EF_MIPS_MACH) { 103 case ELF::EF_MIPS_MACH_NONE: 104 // No feature associated with this value. 105 break; 106 case ELF::EF_MIPS_MACH_OCTEON: 107 Features.AddFeature("cnmips"); 108 break; 109 default: 110 llvm_unreachable("Unknown EF_MIPS_ARCH value"); 111 } 112 113 if (PlatformFlags & ELF::EF_MIPS_ARCH_ASE_M16) 114 Features.AddFeature("mips16"); 115 if (PlatformFlags & ELF::EF_MIPS_MICROMIPS) 116 Features.AddFeature("micromips"); 117 118 return Features; 119 } 120 default: 121 return SubtargetFeatures(); 122 } 123 } 124 125 // FIXME Encode from a tablegen description or target parser. 126 void ELFObjectFileBase::setARMSubArch(Triple &TheTriple) const { 127 if (TheTriple.getSubArch() != Triple::NoSubArch) 128 return; 129 130 ARMAttributeParser Attributes; 131 std::error_code EC = getBuildAttributes(Attributes); 132 if (EC) 133 return; 134 135 std::string Triple; 136 // Default to ARM, but use the triple if it's been set. 137 if (TheTriple.getArch() == Triple::thumb || 138 TheTriple.getArch() == Triple::thumbeb) 139 Triple = "thumb"; 140 else 141 Triple = "arm"; 142 143 switch(Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch)) { 144 case ARMBuildAttrs::v4: 145 Triple += "v4"; 146 break; 147 case ARMBuildAttrs::v4T: 148 Triple += "v4t"; 149 break; 150 case ARMBuildAttrs::v5T: 151 Triple += "v5t"; 152 break; 153 case ARMBuildAttrs::v5TE: 154 Triple += "v5te"; 155 break; 156 case ARMBuildAttrs::v5TEJ: 157 Triple += "v5tej"; 158 break; 159 case ARMBuildAttrs::v6: 160 Triple += "v6"; 161 break; 162 case ARMBuildAttrs::v6KZ: 163 Triple += "v6kz"; 164 break; 165 case ARMBuildAttrs::v6T2: 166 Triple += "v6t2"; 167 break; 168 case ARMBuildAttrs::v6K: 169 Triple += "v6k"; 170 break; 171 case ARMBuildAttrs::v7: 172 Triple += "v7"; 173 break; 174 case ARMBuildAttrs::v6_M: 175 Triple += "v6m"; 176 break; 177 case ARMBuildAttrs::v6S_M: 178 Triple += "v6sm"; 179 break; 180 case ARMBuildAttrs::v7E_M: 181 Triple += "v7em"; 182 break; 183 } 184 if (!isLittleEndian()) 185 Triple += "eb"; 186 187 TheTriple.setArchName(Triple); 188 } 189 190 } // end namespace llvm 191