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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/PPCMCTargetDesc.h"
#include "MCTargetDesc/PPCFixupKinds.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.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);
virtual void sortRelocs(const MCAssembler &Asm,
std::vector<ELFRelocationEntry> &Relocs);
};
class PPCELFRelocationEntry : public ELFRelocationEntry {
public:
PPCELFRelocationEntry(const ELFRelocationEntry &RE);
bool operator<(const PPCELFRelocationEntry &RE) const {
return (RE.r_offset < r_offset ||
(RE.r_offset == r_offset && RE.Type > Type));
}
};
}
PPCELFRelocationEntry::PPCELFRelocationEntry(const ELFRelocationEntry &RE)
: ELFRelocationEntry(RE.r_offset, RE.Index, RE.Type, RE.Symbol,
RE.r_addend, *RE.Fixup) {}
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 PPC::fixup_ppc_brcond14:
Type = ELF::R_PPC_REL14;
break;
case FK_Data_4:
case FK_PCRel_4:
Type = ELF::R_PPC_REL32;
break;
case FK_Data_8:
case FK_PCRel_8:
Type = ELF::R_PPC64_REL64;
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_PPC_DTPREL16_HA:
Type = ELF::R_PPC64_DTPREL16_HA;
break;
case MCSymbolRefExpr::VK_PPC_GAS_HA16:
case MCSymbolRefExpr::VK_PPC_DARWIN_HA16:
Type = ELF::R_PPC_ADDR16_HA;
break;
case MCSymbolRefExpr::VK_PPC_TOC16_HA:
Type = ELF::R_PPC64_TOC16_HA;
break;
case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA:
Type = ELF::R_PPC64_GOT_TPREL16_HA;
break;
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
Type = ELF::R_PPC64_GOT_TLSGD16_HA;
break;
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA:
Type = ELF::R_PPC64_GOT_TLSLD16_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_PPC_DTPREL16_LO:
Type = ELF::R_PPC64_DTPREL16_LO;
break;
case MCSymbolRefExpr::VK_None:
Type = ELF::R_PPC_ADDR16;
break;
case MCSymbolRefExpr::VK_PPC_GAS_LO16:
case MCSymbolRefExpr::VK_PPC_DARWIN_LO16:
Type = ELF::R_PPC_ADDR16_LO;
break;
case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
Type = ELF::R_PPC64_TOC16;
break;
case MCSymbolRefExpr::VK_PPC_TOC16_LO:
Type = ELF::R_PPC64_TOC16_LO;
break;
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
Type = ELF::R_PPC64_GOT_TLSGD16_LO;
break;
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO:
Type = ELF::R_PPC64_GOT_TLSLD16_LO;
break;
}
break;
case PPC::fixup_ppc_lo16_ds:
switch (Modifier) {
default: llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_None:
Type = ELF::R_PPC64_ADDR16_DS;
break;
case MCSymbolRefExpr::VK_PPC_GAS_LO16:
case MCSymbolRefExpr::VK_PPC_DARWIN_LO16:
Type = ELF::R_PPC64_ADDR16_LO_DS;
break;
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;
case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO:
Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
break;
}
break;
case PPC::fixup_ppc_tlsreg:
Type = ELF::R_PPC64_TLS;
break;
case PPC::fixup_ppc_nofixup:
switch (Modifier) {
default: llvm_unreachable("Unsupported Modifier");
case MCSymbolRefExpr::VK_PPC_TLSGD:
Type = ELF::R_PPC64_TLSGD;
break;
case MCSymbolRefExpr::VK_PPC_TLSLD:
Type = ELF::R_PPC64_TLSLD;
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_lo16_ds:
RelocOffset += 2;
break;
default:
break;
}
}
// The standard sorter only sorts on the r_offset field, but PowerPC can
// have multiple relocations at the same offset. Sort secondarily on the
// relocation type to avoid nondeterminism.
void PPCELFObjectWriter::sortRelocs(const MCAssembler &Asm,
std::vector<ELFRelocationEntry> &Relocs) {
// Copy to a temporary vector of relocation entries having a different
// sort function.
std::vector<PPCELFRelocationEntry> TmpRelocs;
for (std::vector<ELFRelocationEntry>::iterator R = Relocs.begin();
R != Relocs.end(); ++R) {
TmpRelocs.push_back(PPCELFRelocationEntry(*R));
}
// Sort in place by ascending r_offset and descending r_type.
array_pod_sort(TmpRelocs.begin(), TmpRelocs.end());
// Copy back to the original vector.
unsigned I = 0;
for (std::vector<PPCELFRelocationEntry>::iterator R = TmpRelocs.begin();
R != TmpRelocs.end(); ++R, ++I) {
Relocs[I] = ELFRelocationEntry(R->r_offset, R->Index, R->Type,
R->Symbol, R->r_addend, *R->Fixup);
}
}
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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