102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
//===- AMDGPUELFObjectWriter.cpp - AMDGPU 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 "AMDGPUFixupKinds.h"
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#include "AMDGPUMCTargetDesc.h"
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#include "MCTargetDesc/AMDGPUMCExpr.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCValue.h"
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using namespace llvm;
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namespace {
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class AMDGPUELFObjectWriter : public MCELFObjectTargetWriter {
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public:
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AMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI, bool HasRelocationAddend);
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protected:
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unsigned getRelocType(const MCFixup &, const MCValue &,
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bool IsPCRel) const override;
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};
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} // end anonymous namespace
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AMDGPUELFObjectWriter::AMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI,
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bool HasRelocationAddend)
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: MCELFObjectTargetWriter(Is64Bit, OSABI, ELF::EM_AMDGPU,
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HasRelocationAddend) {}
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unsigned AMDGPUELFObjectWriter::getRelocType(const MCFixup &Fixup,
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const MCValue &Target,
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bool IsPCRel) const {
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if (const auto *SymA = Target.getAddSym()) {
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// SCRATCH_RSRC_DWORD[01] is a special global variable that represents
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// the scratch buffer.
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if (SymA->getName() == "SCRATCH_RSRC_DWORD0" ||
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SymA->getName() == "SCRATCH_RSRC_DWORD1")
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return ELF::R_AMDGPU_ABS32_LO;
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}
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switch (AMDGPUMCExpr::Specifier(Target.getSpecifier())) {
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default:
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break;
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case AMDGPUMCExpr::S_GOTPCREL:
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return ELF::R_AMDGPU_GOTPCREL;
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case AMDGPUMCExpr::S_GOTPCREL32_LO:
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return ELF::R_AMDGPU_GOTPCREL32_LO;
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case AMDGPUMCExpr::S_GOTPCREL32_HI:
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return ELF::R_AMDGPU_GOTPCREL32_HI;
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case AMDGPUMCExpr::S_REL32_LO:
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return ELF::R_AMDGPU_REL32_LO;
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case AMDGPUMCExpr::S_REL32_HI:
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return ELF::R_AMDGPU_REL32_HI;
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case AMDGPUMCExpr::S_REL64:
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return ELF::R_AMDGPU_REL64;
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case AMDGPUMCExpr::S_ABS32_LO:
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return ELF::R_AMDGPU_ABS32_LO;
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case AMDGPUMCExpr::S_ABS32_HI:
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return ELF::R_AMDGPU_ABS32_HI;
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case AMDGPUMCExpr::S_ABS64:
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return ELF::R_AMDGPU_ABS64;
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}
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MCFixupKind Kind = Fixup.getKind();
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switch (Kind) {
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default: break;
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case FK_Data_4:
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case FK_SecRel_4:
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return IsPCRel ? ELF::R_AMDGPU_REL32 : ELF::R_AMDGPU_ABS32;
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case FK_Data_8:
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return IsPCRel ? ELF::R_AMDGPU_REL64 : ELF::R_AMDGPU_ABS64;
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}
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if (Fixup.getKind() == AMDGPU::fixup_si_sopp_br) {
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const auto *SymA = Target.getAddSym();
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assert(SymA);
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if (SymA->isUndefined()) {
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reportError(Fixup.getLoc(),
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Twine("undefined label '") + SymA->getName() + "'");
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return ELF::R_AMDGPU_NONE;
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}
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return ELF::R_AMDGPU_REL16;
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}
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llvm_unreachable("unhandled relocation type");
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}
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std::unique_ptr<MCObjectTargetWriter>
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llvm::createAMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI,
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bool HasRelocationAddend) {
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return std::make_unique<AMDGPUELFObjectWriter>(Is64Bit, OSABI,
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HasRelocationAddend);
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}
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