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aed2e151eb
Summary: The Mips implementation only covers the feature bits described by the ELF e_flags so far. Mips stores additional feature bits such as MSA in the .MIPS.abiflags section. Also fixed a small bug this revealed where microMIPS wouldn't add the EF_MIPS_MICROMIPS flag when using -filetype=obj. Reviewers: echristo, rafael Subscribers: rafael, mehdi_amini, dsanders, sdardis, llvm-commits Differential Revision: http://reviews.llvm.org/D21125 llvm-svn: 272880
126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
//===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Part of the ELFObjectFile class implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Support/MathExtras.h"
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namespace llvm {
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using namespace object;
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ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source)
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: ObjectFile(Type, Source) {}
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ErrorOr<std::unique_ptr<ObjectFile>>
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ObjectFile::createELFObjectFile(MemoryBufferRef Obj) {
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std::pair<unsigned char, unsigned char> Ident =
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getElfArchType(Obj.getBuffer());
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std::size_t MaxAlignment =
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1ULL << countTrailingZeros(uintptr_t(Obj.getBufferStart()));
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if (MaxAlignment < 2)
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return object_error::parse_failed;
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std::error_code EC;
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std::unique_ptr<ObjectFile> R;
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if (Ident.first == ELF::ELFCLASS32) {
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if (Ident.second == ELF::ELFDATA2LSB)
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R.reset(new ELFObjectFile<ELFType<support::little, false>>(Obj, EC));
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else if (Ident.second == ELF::ELFDATA2MSB)
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R.reset(new ELFObjectFile<ELFType<support::big, false>>(Obj, EC));
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else
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return object_error::parse_failed;
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} else if (Ident.first == ELF::ELFCLASS64) {
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if (Ident.second == ELF::ELFDATA2LSB)
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R.reset(new ELFObjectFile<ELFType<support::little, true>>(Obj, EC));
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else if (Ident.second == ELF::ELFDATA2MSB)
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R.reset(new ELFObjectFile<ELFType<support::big, true>>(Obj, EC));
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else
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return object_error::parse_failed;
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} else {
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return object_error::parse_failed;
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}
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if (EC)
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return EC;
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return std::move(R);
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}
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SubtargetFeatures ELFObjectFileBase::getFeatures() const {
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switch (getEMachine()) {
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case ELF::EM_MIPS: {
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SubtargetFeatures Features;
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unsigned PlatformFlags;
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getPlatformFlags(PlatformFlags);
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switch (PlatformFlags & ELF::EF_MIPS_ARCH) {
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case ELF::EF_MIPS_ARCH_1:
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break;
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case ELF::EF_MIPS_ARCH_2:
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Features.AddFeature("mips2");
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break;
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case ELF::EF_MIPS_ARCH_3:
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Features.AddFeature("mips3");
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break;
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case ELF::EF_MIPS_ARCH_4:
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Features.AddFeature("mips4");
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break;
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case ELF::EF_MIPS_ARCH_5:
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Features.AddFeature("mips5");
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break;
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case ELF::EF_MIPS_ARCH_32:
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Features.AddFeature("mips32");
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break;
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case ELF::EF_MIPS_ARCH_64:
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Features.AddFeature("mips64");
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break;
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case ELF::EF_MIPS_ARCH_32R2:
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Features.AddFeature("mips32r2");
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break;
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case ELF::EF_MIPS_ARCH_64R2:
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Features.AddFeature("mips64r2");
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break;
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case ELF::EF_MIPS_ARCH_32R6:
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Features.AddFeature("mips32r6");
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break;
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case ELF::EF_MIPS_ARCH_64R6:
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Features.AddFeature("mips64r6");
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break;
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default:
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llvm_unreachable("Unknown EF_MIPS_ARCH value");
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}
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switch (PlatformFlags & ELF::EF_MIPS_MACH) {
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case ELF::EF_MIPS_MACH_NONE:
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// No feature associated with this value.
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break;
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case ELF::EF_MIPS_MACH_OCTEON:
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Features.AddFeature("cnmips");
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break;
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default:
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llvm_unreachable("Unknown EF_MIPS_ARCH value");
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}
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if (PlatformFlags & ELF::EF_MIPS_ARCH_ASE_M16)
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Features.AddFeature("mips16");
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if (PlatformFlags & ELF::EF_MIPS_MICROMIPS)
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Features.AddFeature("micromips");
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return Features;
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}
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default:
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return SubtargetFeatures();
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}
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}
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} // end namespace llvm
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