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26169930ef
Summary: Change VEAsmParser to support identification with relocation information in assmebler. Change VEAsmBackend to support relocation information in MC layer. Change VEDisassembler and VEMCCodeEmitter to support binary generation of branch target operands. Add REFLONG fixup and variant kind to support new R_VE_REFLONG ELF symbol. And, add regression test in both MC and CodeGen to check binary genaration with relocation information. Differential Revision: https://reviews.llvm.org/D81553
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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