mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-28 04:29:44 +00:00
b843060ecf
This adds an implementation of getDebugThreadLocalSymbol for (64-bit) PowerPC. This needs to return a generic MCExpr since on ppc64, we need to add a bias of 0x8000 to the value returned by the R_PPC64_DTPREL64 relocation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185461 91177308-0d34-0410-b5e6-96231b3b80d8
68 lines
2.6 KiB
C++
68 lines
2.6 KiB
C++
//===-- 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;
|
|
}
|
|
|
|
const MCExpr *PPC64LinuxTargetObjectFile::
|
|
getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
|
|
const MCExpr *Expr =
|
|
MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_PPC_DTPREL, getContext());
|
|
return MCBinaryExpr::CreateAdd(Expr,
|
|
MCConstantExpr::Create(0x8000, getContext()),
|
|
getContext());
|
|
}
|
|
|