forked from OSchip/llvm-project
136 lines
4.3 KiB
C++
136 lines
4.3 KiB
C++
//===-- VEELFObjectWriter.cpp - VE ELF Writer -----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "VEFixupKinds.h"
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#include "VEMCExpr.h"
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#include "VEMCTargetDesc.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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namespace {
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class VEELFObjectWriter : public MCELFObjectTargetWriter {
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public:
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VEELFObjectWriter(uint8_t OSABI)
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: MCELFObjectTargetWriter(/* Is64Bit */ true, OSABI, ELF::EM_VE,
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/* HasRelocationAddend */ true) {}
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~VEELFObjectWriter() override {}
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protected:
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unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
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const MCFixup &Fixup, bool IsPCRel) const override;
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bool needsRelocateWithSymbol(const MCSymbol &Sym,
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unsigned Type) const override;
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};
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} // namespace
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unsigned VEELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const {
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if (const VEMCExpr *SExpr = dyn_cast<VEMCExpr>(Fixup.getValue())) {
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if (SExpr->getKind() == VEMCExpr::VK_VE_PC_LO32)
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return ELF::R_VE_PC_LO32;
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}
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if (IsPCRel) {
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switch (Fixup.getTargetKind()) {
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default:
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llvm_unreachable("Unimplemented fixup -> relocation");
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case FK_PCRel_1:
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llvm_unreachable("Unimplemented fixup fk_data_1 -> relocation");
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case FK_PCRel_2:
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llvm_unreachable("Unimplemented fixup fk_data_2 -> relocation");
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// FIXME: relative kind?
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case FK_PCRel_4:
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return ELF::R_VE_REFLONG;
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case FK_PCRel_8:
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return ELF::R_VE_REFQUAD;
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case VE::fixup_ve_pc_hi32:
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return ELF::R_VE_PC_HI32;
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case VE::fixup_ve_pc_lo32:
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return ELF::R_VE_PC_LO32;
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}
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}
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switch (Fixup.getTargetKind()) {
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default:
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llvm_unreachable("Unimplemented fixup -> relocation");
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case FK_Data_1:
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llvm_unreachable("Unimplemented fixup fk_data_1 -> relocation");
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case FK_Data_2:
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llvm_unreachable("Unimplemented fixup fk_data_2 -> relocation");
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case FK_Data_4:
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return ELF::R_VE_REFLONG;
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case FK_Data_8:
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return ELF::R_VE_REFQUAD;
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case VE::fixup_ve_reflong:
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return ELF::R_VE_REFLONG;
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case VE::fixup_ve_hi32:
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return ELF::R_VE_HI32;
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case VE::fixup_ve_lo32:
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return ELF::R_VE_LO32;
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case VE::fixup_ve_pc_hi32:
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llvm_unreachable("Unimplemented fixup pc_hi32 -> relocation");
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case VE::fixup_ve_pc_lo32:
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llvm_unreachable("Unimplemented fixup pc_lo32 -> relocation");
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case VE::fixup_ve_got_hi32:
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return ELF::R_VE_GOT_HI32;
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case VE::fixup_ve_got_lo32:
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return ELF::R_VE_GOT_LO32;
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case VE::fixup_ve_gotoff_hi32:
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return ELF::R_VE_GOTOFF_HI32;
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case VE::fixup_ve_gotoff_lo32:
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return ELF::R_VE_GOTOFF_LO32;
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case VE::fixup_ve_plt_hi32:
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return ELF::R_VE_PLT_HI32;
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case VE::fixup_ve_plt_lo32:
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return ELF::R_VE_PLT_LO32;
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case VE::fixup_ve_tls_gd_hi32:
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return ELF::R_VE_TLS_GD_HI32;
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case VE::fixup_ve_tls_gd_lo32:
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return ELF::R_VE_TLS_GD_LO32;
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case VE::fixup_ve_tpoff_hi32:
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return ELF::R_VE_TPOFF_HI32;
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case VE::fixup_ve_tpoff_lo32:
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return ELF::R_VE_TPOFF_LO32;
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}
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return ELF::R_VE_NONE;
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}
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bool VEELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
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unsigned Type) const {
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switch (Type) {
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default:
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return false;
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// All relocations that use a GOT need a symbol, not an offset, as
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// the offset of the symbol within the section is irrelevant to
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// where the GOT entry is. Don't need to list all the TLS entries,
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// as they're all marked as requiring a symbol anyways.
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case ELF::R_VE_GOT_HI32:
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case ELF::R_VE_GOT_LO32:
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case ELF::R_VE_GOTOFF_HI32:
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case ELF::R_VE_GOTOFF_LO32:
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case ELF::R_VE_TLS_GD_HI32:
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case ELF::R_VE_TLS_GD_LO32:
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return true;
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}
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}
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std::unique_ptr<MCObjectTargetWriter>
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llvm::createVEELFObjectWriter(uint8_t OSABI) {
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return std::make_unique<VEELFObjectWriter>(OSABI);
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}
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