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Diffstat (limited to 'lib/Target/PowerPC/PPCTargetObjectFile.cpp')
-rw-r--r-- | lib/Target/PowerPC/PPCTargetObjectFile.cpp | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCTargetObjectFile.cpp b/lib/Target/PowerPC/PPCTargetObjectFile.cpp new file mode 100644 index 0000000000..90e4f15452 --- /dev/null +++ b/lib/Target/PowerPC/PPCTargetObjectFile.cpp @@ -0,0 +1,57 @@ +//===-- PPCTargetObjectFile.cpp - PPC Object Info -------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "PPCTargetObjectFile.h" +#include "llvm/MC/MCContext.h" +#include "llvm/MC/MCExpr.h" +#include "llvm/MC/MCSectionELF.h" +#include "llvm/Target/Mangler.h" + +using namespace llvm; + +void +PPC64LinuxTargetObjectFile:: +Initialize(MCContext &Ctx, const TargetMachine &TM) { + TargetLoweringObjectFileELF::Initialize(Ctx, TM); + InitializeELF(TM.Options.UseInitArray); +} + +const MCSection * PPC64LinuxTargetObjectFile:: +SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, + Mangler *Mang, const TargetMachine &TM) const { + + const MCSection *DefaultSection = + TargetLoweringObjectFileELF::SelectSectionForGlobal(GV, Kind, Mang, TM); + + if (DefaultSection != ReadOnlySection) + return DefaultSection; + + // Here override ReadOnlySection to DataRelROSection for PPC64 SVR4 ABI + // when we have a constant that contains global relocations. This is + // necessary because of this ABI's handling of pointers to functions in + // a shared library. The address of a function is actually the address + // of a function descriptor, which resides in the .opd section. Generated + // code uses the descriptor directly rather than going via the GOT as some + // other ABIs do, which means that initialized function pointers must + // reference the descriptor. The linker must convert copy relocs of + // pointers to functions in shared libraries into dynamic relocations, + // because of an ordering problem with initialization of copy relocs and + // PLT entries. The dynamic relocation will be initialized by the dynamic + // linker, so we must use DataRelROSection instead of ReadOnlySection. + // For more information, see the description of ELIMINATE_COPY_RELOCS in + // GNU ld. + const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV); + + if (GVar && GVar->isConstant() && + (GVar->getInitializer()->getRelocationInfo() == + Constant::GlobalRelocations)) + return DataRelROSection; + + return DefaultSection; +} |