106 lines · cpp
1//===-- LoongArchELFObjectWriter.cpp - LoongArch ELF Writer ---*- C++ -*---===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "MCTargetDesc/LoongArchFixupKinds.h"10#include "MCTargetDesc/LoongArchMCTargetDesc.h"11#include "llvm/BinaryFormat/ELF.h"12#include "llvm/MC/MCContext.h"13#include "llvm/MC/MCELFObjectWriter.h"14#include "llvm/MC/MCFixup.h"15#include "llvm/MC/MCObjectWriter.h"16#include "llvm/MC/MCValue.h"17#include "llvm/Support/ErrorHandling.h"18 19using namespace llvm;20 21namespace {22class LoongArchELFObjectWriter : public MCELFObjectTargetWriter {23public:24 LoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit);25 26 ~LoongArchELFObjectWriter() override;27 28 bool needsRelocateWithSymbol(const MCValue &, unsigned Type) const override {29 return true;30 }31 32protected:33 unsigned getRelocType(const MCFixup &, const MCValue &,34 bool IsPCRel) const override;35};36} // end namespace37 38LoongArchELFObjectWriter::LoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit)39 : MCELFObjectTargetWriter(Is64Bit, OSABI, ELF::EM_LOONGARCH,40 /*HasRelocationAddend=*/true) {}41 42LoongArchELFObjectWriter::~LoongArchELFObjectWriter() = default;43 44unsigned LoongArchELFObjectWriter::getRelocType(const MCFixup &Fixup,45 const MCValue &Target,46 bool IsPCRel) const {47 switch (Target.getSpecifier()) {48 case ELF::R_LARCH_TLS_LE_HI20:49 case ELF::R_LARCH_TLS_IE_PC_HI20:50 case ELF::R_LARCH_TLS_IE_HI20:51 case ELF::R_LARCH_TLS_LD_PC_HI20:52 case ELF::R_LARCH_TLS_LD_HI20:53 case ELF::R_LARCH_TLS_GD_PC_HI20:54 case ELF::R_LARCH_TLS_GD_HI20:55 case ELF::R_LARCH_TLS_DESC_PC_HI20:56 case ELF::R_LARCH_TLS_DESC_HI20:57 case ELF::R_LARCH_TLS_LE_HI20_R:58 case ELF::R_LARCH_TLS_LD_PCREL20_S2:59 case ELF::R_LARCH_TLS_GD_PCREL20_S2:60 case ELF::R_LARCH_TLS_DESC_PCREL20_S2:61 if (auto *SA = const_cast<MCSymbol *>(Target.getAddSym()))62 static_cast<MCSymbolELF *>(SA)->setType(ELF::STT_TLS);63 break;64 default:65 break;66 }67 68 auto Kind = Fixup.getKind();69 if (mc::isRelocation(Fixup.getKind()))70 return Kind;71 switch (Kind) {72 default:73 reportError(Fixup.getLoc(), "Unsupported relocation type");74 return ELF::R_LARCH_NONE;75 case FK_Data_1:76 reportError(Fixup.getLoc(), "1-byte data relocations not supported");77 return ELF::R_LARCH_NONE;78 case FK_Data_2:79 reportError(Fixup.getLoc(), "2-byte data relocations not supported");80 return ELF::R_LARCH_NONE;81 case FK_Data_4:82 return IsPCRel ? ELF::R_LARCH_32_PCREL : ELF::R_LARCH_32;83 case FK_Data_8:84 return IsPCRel ? ELF::R_LARCH_64_PCREL : ELF::R_LARCH_64;85 case LoongArch::fixup_loongarch_b16:86 return ELF::R_LARCH_B16;87 case LoongArch::fixup_loongarch_b21:88 return ELF::R_LARCH_B21;89 case LoongArch::fixup_loongarch_b26:90 return ELF::R_LARCH_B26;91 case LoongArch::fixup_loongarch_abs_hi20:92 return ELF::R_LARCH_ABS_HI20;93 case LoongArch::fixup_loongarch_abs_lo12:94 return ELF::R_LARCH_ABS_LO12;95 case LoongArch::fixup_loongarch_abs64_lo20:96 return ELF::R_LARCH_ABS64_LO20;97 case LoongArch::fixup_loongarch_abs64_hi12:98 return ELF::R_LARCH_ABS64_HI12;99 }100}101 102std::unique_ptr<MCObjectTargetWriter>103llvm::createLoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit) {104 return std::make_unique<LoongArchELFObjectWriter>(OSABI, Is64Bit);105}106