| //===-- BPFELFObjectWriter.cpp - BPF ELF Writer ---------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "MCTargetDesc/BPFMCTargetDesc.h" |
| #include "llvm/BinaryFormat/ELF.h" |
| #include "llvm/MC/MCELFObjectWriter.h" |
| #include "llvm/MC/MCFixup.h" |
| #include "llvm/MC/MCObjectWriter.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include <cstdint> |
| |
| using namespace llvm; |
| |
| namespace { |
| |
| class BPFELFObjectWriter : public MCELFObjectTargetWriter { |
| public: |
| BPFELFObjectWriter(uint8_t OSABI); |
| ~BPFELFObjectWriter() override = default; |
| |
| protected: |
| unsigned getRelocType(MCContext &Ctx, const MCValue &Target, |
| const MCFixup &Fixup, bool IsPCRel) const override; |
| }; |
| |
| } // end anonymous namespace |
| |
| BPFELFObjectWriter::BPFELFObjectWriter(uint8_t OSABI) |
| : MCELFObjectTargetWriter(/*Is64Bit*/ true, OSABI, ELF::EM_BPF, |
| /*HasRelocationAddend*/ false) {} |
| |
| unsigned BPFELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target, |
| const MCFixup &Fixup, |
| bool IsPCRel) const { |
| // determine the type of the relocation |
| switch ((unsigned)Fixup.getKind()) { |
| default: |
| llvm_unreachable("invalid fixup kind!"); |
| case FK_SecRel_8: |
| return ELF::R_BPF_64_64; |
| case FK_PCRel_4: |
| case FK_SecRel_4: |
| return ELF::R_BPF_64_32; |
| case FK_Data_8: |
| return ELF::R_BPF_64_64; |
| case FK_Data_4: |
| return ELF::R_BPF_64_32; |
| } |
| } |
| |
| std::unique_ptr<MCObjectTargetWriter> |
| llvm::createBPFELFObjectWriter(uint8_t OSABI) { |
| return llvm::make_unique<BPFELFObjectWriter>(OSABI); |
| } |