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59b05e81f9
Commit r181723 introduced code to avoid placing initialized variables needing relocations into the .rodata section, which avoid copy relocs that do not work as expected on ppc64 function references. The same treatment is also needed for *named* .rodata.XXX sections. This patch changes PPC64LinuxTargetObjectFile::SelectSectionForGlobal to modify "Kind" *before* calling the default SelectSectionForGlobal routine, instead of first calling the default routine and then just checking for the (main) .rodata section afterwards. llvm-svn: 203921
64 lines
2.6 KiB
C++
64 lines
2.6 KiB
C++
//===-- PPCTargetObjectFile.cpp - PPC Object Info -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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const MCSection *PPC64LinuxTargetObjectFile::SelectSectionForGlobal(
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const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
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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 GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
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if (GVar && GVar->isConstant() &&
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(GVar->getInitializer()->getRelocationInfo() ==
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Constant::GlobalRelocations))
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Kind = SectionKind::getReadOnlyWithRel();
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}
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return TargetLoweringObjectFileELF::SelectSectionForGlobal(GV, Kind,
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Mang, 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_PPC_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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