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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
59 lines
2.5 KiB
C++
59 lines
2.5 KiB
C++
//===-- PPCTargetObjectFile.cpp - PPC Object Info -------------------------===//
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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 "PPCTargetObjectFile.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCSectionELF.h"
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using namespace llvm;
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void
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PPC64LinuxTargetObjectFile::
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Initialize(MCContext &Ctx, const TargetMachine &TM) {
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TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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InitializeELF(TM.Options.UseInitArray);
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}
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MCSection *PPC64LinuxTargetObjectFile::SelectSectionForGlobal(
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const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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// Here override ReadOnlySection to DataRelROSection for PPC64 SVR4 ABI
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// when we have a constant that contains global relocations. This is
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// necessary because of this ABI's handling of pointers to functions in
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// a shared library. The address of a function is actually the address
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// of a function descriptor, which resides in the .opd section. Generated
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// code uses the descriptor directly rather than going via the GOT as some
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// other ABIs do, which means that initialized function pointers must
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// reference the descriptor. The linker must convert copy relocs of
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// pointers to functions in shared libraries into dynamic relocations,
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// because of an ordering problem with initialization of copy relocs and
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// PLT entries. The dynamic relocation will be initialized by the dynamic
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// linker, so we must use DataRelROSection instead of ReadOnlySection.
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// For more information, see the description of ELIMINATE_COPY_RELOCS in
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// GNU ld.
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if (Kind.isReadOnly()) {
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const auto *GVar = dyn_cast<GlobalVariable>(GO);
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if (GVar && GVar->isConstant() && GVar->getInitializer()->needsRelocation())
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Kind = SectionKind::getReadOnlyWithRel();
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}
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return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
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}
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const MCExpr *PPC64LinuxTargetObjectFile::
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getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
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const MCExpr *Expr =
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MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPREL, getContext());
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return MCBinaryExpr::createAdd(Expr,
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MCConstantExpr::create(0x8000, getContext()),
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getContext());
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}
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