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//===-- PPCELFObjectWriter.cpp - PPC ELF Writer ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/PPCFixupKinds.h"
#include "MCTargetDesc/PPCMCTargetDesc.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCValue.h"
using namespace llvm;
namespace {
class PPCELFObjectWriter : public MCELFObjectTargetWriter {
public:
PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI);
virtual ~PPCELFObjectWriter();
protected:
virtual unsigned getRelocTypeInner(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const;
virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
bool IsPCRel, bool IsRelocWithSymbol,
int64_t Addend) const;
virtual const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const;
virtual void adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset);
};
}
PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
: MCELFObjectTargetWriter(Is64Bit, OSABI,
Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
/*HasRelocationAddend*/ true) {}
PPCELFObjectWriter::~PPCELFObjectWriter() {
}
unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const
{
MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
// determine the type of the relocation
unsigned Type;
if (IsPCRel) {
switch ((unsigned)Fixup.getKind()) {
default:
llvm_unreachable("Unimplemented");
case PPC::fixup_ppc_br24:
Type = ELF::R_PPC_REL24;
break;
case FK_PCRel_4:
Type = ELF::R_PPC_REL32;
break;
}
} else {
switch ((unsigned)Fixup.getKind()) {
default: llvm_unreachable("invalid fixup kind!");
case PPC::fixup_ppc_br24:
Type = ELF::R_PPC_ADDR24;
break;
case PPC::fixup_ppc_brcond14:
Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
break;
case PPC::fixup_ppc_ha16:
switch (Modifier) {
default: llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_PPC_TPREL16_HA:
Type = ELF::R_PPC_TPREL16_HA;
break;
case MCSymbolRefExpr::VK_None:
Type = ELF::R_PPC_ADDR16_HA;
break;
case MCSymbolRefExpr::VK_PPC_TOC16_HA:
Type = ELF::R_PPC64_TOC16_HA;
break;
}
break;
case PPC::fixup_ppc_lo16:
switch (Modifier) {
default: llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
Type = ELF::R_PPC_TPREL16_LO;
break;
case MCSymbolRefExpr::VK_None:
Type = ELF::R_PPC_ADDR16_LO;
break;
case MCSymbolRefExpr::VK_PPC_TOC16_LO:
Type = ELF::R_PPC64_TOC16_LO;
break;
}
break;
case PPC::fixup_ppc_lo14:
Type = ELF::R_PPC_ADDR14;
break;
case PPC::fixup_ppc_toc:
Type = ELF::R_PPC64_TOC;
break;
case PPC::fixup_ppc_toc16:
Type = ELF::R_PPC64_TOC16;
break;
case PPC::fixup_ppc_toc16_ds:
switch (Modifier) {
default: llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
Type = ELF::R_PPC64_TOC16_DS;
break;
case MCSymbolRefExpr::VK_PPC_TOC16_LO:
Type = ELF::R_PPC64_TOC16_LO_DS;
break;
}
break;
case FK_Data_8:
switch (Modifier) {
default: llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_PPC_TOC:
Type = ELF::R_PPC64_TOC;
break;
case MCSymbolRefExpr::VK_None:
Type = ELF::R_PPC64_ADDR64;
break;
}
break;
case FK_Data_4:
Type = ELF::R_PPC_ADDR32;
break;
case FK_Data_2:
Type = ELF::R_PPC_ADDR16;
break;
}
}
return Type;
}
unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel,
bool IsRelocWithSymbol,
int64_t Addend) const {
return getRelocTypeInner(Target, Fixup, IsPCRel);
}
const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const {
assert(Target.getSymA() && "SymA cannot be 0");
const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
// The .odp creation emits a relocation against the symbol ".TOC." which
// create a R_PPC64_TOC relocation. However the relocation symbol name
// in final object creation should be NULL, since the symbol does not
// really exist, it is just the reference to TOC base for the current
// object file.
bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
if (EmitThisSym && !Symbol.isTemporary())
return &Symbol;
return NULL;
}
void PPCELFObjectWriter::
adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset) {
switch ((unsigned)Fixup.getKind()) {
case PPC::fixup_ppc_ha16:
case PPC::fixup_ppc_lo16:
case PPC::fixup_ppc_toc16:
case PPC::fixup_ppc_toc16_ds:
RelocOffset += 2;
break;
default:
break;
}
}
MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
bool Is64Bit,
uint8_t OSABI) {
MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);
}
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