//
//===----------------------------------------------------------------------===//
-#include "ELFObjectWriter.h"
+#include "MCELF.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCELFObjectWriter.h"
+#include "llvm/MC/MCELFSymbolFlags.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/CommandLine.h"
-#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringSwitch.h"
-#include "../Target/X86/MCTargetDesc/X86FixupKinds.h"
-#include "../Target/ARM/MCTargetDesc/ARMFixupKinds.h"
-#include "../Target/PowerPC/MCTargetDesc/PPCFixupKinds.h"
-
#include <vector>
using namespace llvm;
#undef DEBUG_TYPE
#define DEBUG_TYPE "reloc-info"
+namespace {
+class ELFObjectWriter : public MCObjectWriter {
+ protected:
+
+ static bool isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind);
+ static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant);
+ static uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout);
+ static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data,
+ bool Used, bool Renamed);
+ static bool isLocal(const MCSymbolData &Data, bool isSignature,
+ bool isUsedInReloc);
+ static bool IsELFMetaDataSection(const MCSectionData &SD);
+ static uint64_t DataSectionSize(const MCSectionData &SD);
+ static uint64_t GetSectionFileSize(const MCAsmLayout &Layout,
+ const MCSectionData &SD);
+ static uint64_t GetSectionAddressSize(const MCAsmLayout &Layout,
+ const MCSectionData &SD);
+
+ void WriteDataSectionData(MCAssembler &Asm,
+ const MCAsmLayout &Layout,
+ const MCSectionELF &Section);
+
+ /*static bool isFixupKindX86RIPRel(unsigned Kind) {
+ return Kind == X86::reloc_riprel_4byte ||
+ Kind == X86::reloc_riprel_4byte_movq_load;
+ }*/
+
+ /// ELFSymbolData - Helper struct for containing some precomputed
+ /// information on symbols.
+ struct ELFSymbolData {
+ MCSymbolData *SymbolData;
+ uint64_t StringIndex;
+ uint32_t SectionIndex;
+
+ // Support lexicographic sorting.
+ bool operator<(const ELFSymbolData &RHS) const {
+ if (MCELF::GetType(*SymbolData) == ELF::STT_FILE)
+ return true;
+ if (MCELF::GetType(*RHS.SymbolData) == ELF::STT_FILE)
+ return false;
+ return SymbolData->getSymbol().getName() <
+ RHS.SymbolData->getSymbol().getName();
+ }
+ };
+
+ /// @name Relocation Data
+ /// @{
+
+ struct ELFRelocationEntry {
+ // Make these big enough for both 32-bit and 64-bit
+ uint64_t r_offset;
+ int Index;
+ unsigned Type;
+ const MCSymbol *Symbol;
+ uint64_t r_addend;
+
+ ELFRelocationEntry()
+ : r_offset(0), Index(0), Type(0), Symbol(0), r_addend(0) {}
+
+ ELFRelocationEntry(uint64_t RelocOffset, int Idx,
+ unsigned RelType, const MCSymbol *Sym,
+ uint64_t Addend)
+ : r_offset(RelocOffset), Index(Idx), Type(RelType),
+ Symbol(Sym), r_addend(Addend) {}
+
+ // Support lexicographic sorting.
+ bool operator<(const ELFRelocationEntry &RE) const {
+ return RE.r_offset < r_offset;
+ }
+ };
+
+ /// The target specific ELF writer instance.
+ llvm::OwningPtr<MCELFObjectTargetWriter> TargetObjectWriter;
+
+ SmallPtrSet<const MCSymbol *, 16> UsedInReloc;
+ SmallPtrSet<const MCSymbol *, 16> WeakrefUsedInReloc;
+ DenseMap<const MCSymbol *, const MCSymbol *> Renames;
+
+ llvm::DenseMap<const MCSectionData*,
+ std::vector<ELFRelocationEntry> > Relocations;
+ DenseMap<const MCSection*, uint64_t> SectionStringTableIndex;
+
+ /// @}
+ /// @name Symbol Table Data
+ /// @{
+
+ SmallString<256> StringTable;
+ std::vector<ELFSymbolData> LocalSymbolData;
+ std::vector<ELFSymbolData> ExternalSymbolData;
+ std::vector<ELFSymbolData> UndefinedSymbolData;
+
+ /// @}
+
+ bool NeedsGOT;
+
+ bool NeedsSymtabShndx;
+
+ // This holds the symbol table index of the last local symbol.
+ unsigned LastLocalSymbolIndex;
+ // This holds the .strtab section index.
+ unsigned StringTableIndex;
+ // This holds the .symtab section index.
+ unsigned SymbolTableIndex;
+
+ unsigned ShstrtabIndex;
+
+
+ const MCSymbol *SymbolToReloc(const MCAssembler &Asm,
+ const MCValue &Target,
+ const MCFragment &F,
+ const MCFixup &Fixup,
+ bool IsPCRel) const;
+
+ // TargetObjectWriter wrappers.
+ const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
+ const MCValue &Target,
+ const MCFragment &F,
+ const MCFixup &Fixup,
+ bool IsPCRel) const {
+ return TargetObjectWriter->ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel);
+ }
+
+ bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
+ bool hasRelocationAddend() const {
+ return TargetObjectWriter->hasRelocationAddend();
+ }
+ unsigned getEFlags() const {
+ return TargetObjectWriter->getEFlags();
+ }
+ unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
+ bool IsPCRel, bool IsRelocWithSymbol,
+ int64_t Addend) const {
+ return TargetObjectWriter->GetRelocType(Target, Fixup, IsPCRel,
+ IsRelocWithSymbol, Addend);
+ }
+
+
+ public:
+ ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS, bool IsLittleEndian)
+ : MCObjectWriter(_OS, IsLittleEndian),
+ TargetObjectWriter(MOTW),
+ NeedsGOT(false), NeedsSymtabShndx(false){
+ }
+
+ virtual ~ELFObjectWriter();
+
+ void WriteWord(uint64_t W) {
+ if (is64Bit())
+ Write64(W);
+ else
+ Write32(W);
+ }
+
+ void StringLE16(char *buf, uint16_t Value) {
+ buf[0] = char(Value >> 0);
+ buf[1] = char(Value >> 8);
+ }
+
+ void StringLE32(char *buf, uint32_t Value) {
+ StringLE16(buf, uint16_t(Value >> 0));
+ StringLE16(buf + 2, uint16_t(Value >> 16));
+ }
+
+ void StringLE64(char *buf, uint64_t Value) {
+ StringLE32(buf, uint32_t(Value >> 0));
+ StringLE32(buf + 4, uint32_t(Value >> 32));
+ }
+
+ void StringBE16(char *buf ,uint16_t Value) {
+ buf[0] = char(Value >> 8);
+ buf[1] = char(Value >> 0);
+ }
+
+ void StringBE32(char *buf, uint32_t Value) {
+ StringBE16(buf, uint16_t(Value >> 16));
+ StringBE16(buf + 2, uint16_t(Value >> 0));
+ }
+
+ void StringBE64(char *buf, uint64_t Value) {
+ StringBE32(buf, uint32_t(Value >> 32));
+ StringBE32(buf + 4, uint32_t(Value >> 0));
+ }
+
+ void String8(MCDataFragment &F, uint8_t Value) {
+ char buf[1];
+ buf[0] = Value;
+ F.getContents() += StringRef(buf, 1);
+ }
+
+ void String16(MCDataFragment &F, uint16_t Value) {
+ char buf[2];
+ if (isLittleEndian())
+ StringLE16(buf, Value);
+ else
+ StringBE16(buf, Value);
+ F.getContents() += StringRef(buf, 2);
+ }
+
+ void String32(MCDataFragment &F, uint32_t Value) {
+ char buf[4];
+ if (isLittleEndian())
+ StringLE32(buf, Value);
+ else
+ StringBE32(buf, Value);
+ F.getContents() += StringRef(buf, 4);
+ }
+
+ void String64(MCDataFragment &F, uint64_t Value) {
+ char buf[8];
+ if (isLittleEndian())
+ StringLE64(buf, Value);
+ else
+ StringBE64(buf, Value);
+ F.getContents() += StringRef(buf, 8);
+ }
+
+ void WriteHeader(uint64_t SectionDataSize,
+ unsigned NumberOfSections);
+
+ void WriteSymbolEntry(MCDataFragment *SymtabF,
+ MCDataFragment *ShndxF,
+ uint64_t name, uint8_t info,
+ uint64_t value, uint64_t size,
+ uint8_t other, uint32_t shndx,
+ bool Reserved);
+
+ void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
+ ELFSymbolData &MSD,
+ const MCAsmLayout &Layout);
+
+ typedef DenseMap<const MCSectionELF*, uint32_t> SectionIndexMapTy;
+ void WriteSymbolTable(MCDataFragment *SymtabF,
+ MCDataFragment *ShndxF,
+ const MCAssembler &Asm,
+ const MCAsmLayout &Layout,
+ const SectionIndexMapTy &SectionIndexMap);
+
+ virtual void RecordRelocation(const MCAssembler &Asm,
+ const MCAsmLayout &Layout,
+ const MCFragment *Fragment,
+ const MCFixup &Fixup,
+ MCValue Target, uint64_t &FixedValue);
+
+ uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm,
+ const MCSymbol *S);
+
+ // Map from a group section to the signature symbol
+ typedef DenseMap<const MCSectionELF*, const MCSymbol*> GroupMapTy;
+ // Map from a signature symbol to the group section
+ typedef DenseMap<const MCSymbol*, const MCSectionELF*> RevGroupMapTy;
+ // Map from a section to the section with the relocations
+ typedef DenseMap<const MCSectionELF*, const MCSectionELF*> RelMapTy;
+ // Map from a section to its offset
+ typedef DenseMap<const MCSectionELF*, uint64_t> SectionOffsetMapTy;
+
+ /// ComputeSymbolTable - Compute the symbol table data
+ ///
+ /// \param StringTable [out] - The string table data.
+ /// \param StringIndexMap [out] - Map from symbol names to offsets in the
+ /// string table.
+ void ComputeSymbolTable(MCAssembler &Asm,
+ const SectionIndexMapTy &SectionIndexMap,
+ RevGroupMapTy RevGroupMap,
+ unsigned NumRegularSections);
+
+ void ComputeIndexMap(MCAssembler &Asm,
+ SectionIndexMapTy &SectionIndexMap,
+ const RelMapTy &RelMap);
+
+ void CreateRelocationSections(MCAssembler &Asm, MCAsmLayout &Layout,
+ RelMapTy &RelMap);
+
+ void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout,
+ const RelMapTy &RelMap);
+
+ void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout,
+ SectionIndexMapTy &SectionIndexMap,
+ const RelMapTy &RelMap);
+
+ // Create the sections that show up in the symbol table. Currently
+ // those are the .note.GNU-stack section and the group sections.
+ void CreateIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout,
+ GroupMapTy &GroupMap,
+ RevGroupMapTy &RevGroupMap,
+ SectionIndexMapTy &SectionIndexMap,
+ const RelMapTy &RelMap);
+
+ virtual void ExecutePostLayoutBinding(MCAssembler &Asm,
+ const MCAsmLayout &Layout);
+
+ void WriteSectionHeader(MCAssembler &Asm, const GroupMapTy &GroupMap,
+ const MCAsmLayout &Layout,
+ const SectionIndexMapTy &SectionIndexMap,
+ const SectionOffsetMapTy &SectionOffsetMap);
+
+ void ComputeSectionOrder(MCAssembler &Asm,
+ std::vector<const MCSectionELF*> &Sections);
+
+ void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags,
+ uint64_t Address, uint64_t Offset,
+ uint64_t Size, uint32_t Link, uint32_t Info,
+ uint64_t Alignment, uint64_t EntrySize);
+
+ void WriteRelocationsFragment(const MCAssembler &Asm,
+ MCDataFragment *F,
+ const MCSectionData *SD);
+
+ virtual bool
+ IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
+ const MCSymbolData &DataA,
+ const MCFragment &FB,
+ bool InSet,
+ bool IsPCRel) const;
+
+ virtual void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout);
+ void WriteSection(MCAssembler &Asm,
+ const SectionIndexMapTy &SectionIndexMap,
+ uint32_t GroupSymbolIndex,
+ uint64_t Offset, uint64_t Size, uint64_t Alignment,
+ const MCSectionELF &Section);
+ };
+}
+
bool ELFObjectWriter::isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind) {
const MCFixupKindInfo &FKI =
Asm.getBackend().getFixupKindInfo((MCFixupKind) Kind);
Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION]
// e_ident[EI_OSABI]
- switch (TargetObjectWriter->getOSType()) {
- case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break;
- case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break;
- default: Write8(ELF::ELFOSABI_NONE); break;
- }
+ Write8(TargetObjectWriter->getOSABI());
Write8(0); // e_ident[EI_ABIVERSION]
WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD);
sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes
// e_flags = whatever the target wants
- WriteEFlags();
+ Write32(getEFlags());
// e_ehsize = ELF header size
Write16(is64Bit() ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr));
// e_shnum = # of section header ents
if (NumberOfSections >= ELF::SHN_LORESERVE)
- Write16(0);
+ Write16(ELF::SHN_UNDEF);
else
Write16(NumberOfSections);
// e_shstrndx = Section # of '.shstrtab'
- if (NumberOfSections >= ELF::SHN_LORESERVE)
+ if (ShstrtabIndex >= ELF::SHN_LORESERVE)
Write16(ELF::SHN_XINDEX);
else
Write16(ShstrtabIndex);
if (const MCExpr *Value = Symbol.getVariableValue()) {
int64_t IntValue;
if (Value->EvaluateAsAbsolute(IntValue, Layout))
- return (uint64_t)IntValue;
+ return (uint64_t)IntValue;
}
}
MCDataFragment *ShndxF,
const MCAssembler &Asm,
const MCAsmLayout &Layout,
- const SectionIndexMapTy &SectionIndexMap) {
+ const SectionIndexMapTy &SectionIndexMap) {
// The string table must be emitted first because we need the index
// into the string table for all the symbol names.
assert(StringTable.size() && "Missing string table");
if (Section.getType() == ELF::SHT_RELA ||
Section.getType() == ELF::SHT_REL ||
Section.getType() == ELF::SHT_STRTAB ||
- Section.getType() == ELF::SHT_SYMTAB)
+ Section.getType() == ELF::SHT_SYMTAB ||
+ Section.getType() == ELF::SHT_SYMTAB_SHNDX)
continue;
WriteSymbolEntry(SymtabF, ShndxF, 0, ELF::STT_SECTION, 0, 0,
- ELF::STV_DEFAULT, SectionIndexMap.lookup(&Section), false);
+ ELF::STV_DEFAULT, SectionIndexMap.lookup(&Section),
+ false);
LastLocalSymbolIndex++;
}
// Offset of the symbol in the section
int64_t a = Layout.getSymbolOffset(&SDB);
- // Ofeset of the relocation in the section
+ // Offset of the relocation in the section
int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
Value += b - a;
}
FixedValue = Value;
unsigned Type = GetRelocType(Target, Fixup, IsPCRel,
(RelocSymbol != 0), Addend);
+ MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
+ MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
+ if (RelocNeedsGOT(Modifier))
+ NeedsGOT = true;
uint64_t RelocOffset = Layout.getFragmentOffset(Fragment) +
Fixup.getOffset();
- adjustFixupOffset(Fixup, RelocOffset);
+ // FIXME: no tests cover this. Is adjustFixupOffset dead code?
+ TargetObjectWriter->adjustFixupOffset(Fixup, RelocOffset);
if (!hasRelocationAddend())
Addend = 0;
ExternalSymbolData[i].SymbolData->setIndex(Index++);
for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
UndefinedSymbolData[i].SymbolData->setIndex(Index++);
+
+ if (NumRegularSections > ELF::SHN_LORESERVE)
+ NeedsSymtabShndx = true;
}
void ELFObjectWriter::CreateRelocationSections(MCAssembler &Asm,
// Nothing to do.
break;
- case ELF::SHT_GROUP: {
+ case ELF::SHT_GROUP:
sh_link = SymbolTableIndex;
sh_info = GroupSymbolIndex;
break;
- }
default:
assert(0 && "FIXME: sh_type value not supported!");
WriteBytes(cast<MCDataFragment>(F).getContents().str());
}
} else {
- Asm.WriteSectionData(&SD, Layout);
+ Asm.writeSectionData(&SD, Layout);
}
}
FileOff = OS.tell();
- // ... and then the remainting sections ...
+ // ... and then the remaining sections ...
for (unsigned i = NumRegularSections + 1; i < NumSections; ++i)
WriteDataSectionData(Asm, Layout, *Sections[i]);
}
MCObjectWriter *llvm::createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
raw_ostream &OS,
bool IsLittleEndian) {
- switch (MOTW->getEMachine()) {
- case ELF::EM_386:
- case ELF::EM_X86_64:
- return new X86ELFObjectWriter(MOTW, OS, IsLittleEndian); break;
- case ELF::EM_ARM:
- return new ARMELFObjectWriter(MOTW, OS, IsLittleEndian); break;
- case ELF::EM_MBLAZE:
- return new MBlazeELFObjectWriter(MOTW, OS, IsLittleEndian); break;
- case ELF::EM_PPC:
- case ELF::EM_PPC64:
- return new PPCELFObjectWriter(MOTW, OS, IsLittleEndian); break;
- case ELF::EM_MIPS:
- return new MipsELFObjectWriter(MOTW, OS, IsLittleEndian); break;
- default: llvm_unreachable("Unsupported architecture"); break;
- }
-}
-
-
-/// START OF SUBCLASSES for ELFObjectWriter
-//===- ARMELFObjectWriter -------------------------------------------===//
-
-ARMELFObjectWriter::ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW,
- raw_ostream &_OS,
- bool IsLittleEndian)
- : ELFObjectWriter(MOTW, _OS, IsLittleEndian)
-{}
-
-ARMELFObjectWriter::~ARMELFObjectWriter()
-{}
-
-// FIXME: get the real EABI Version from the Triple.
-void ARMELFObjectWriter::WriteEFlags() {
- Write32(ELF::EF_ARM_EABIMASK & DefaultEABIVersion);
-}
-
-// In ARM, _MergedGlobals and other most symbols get emitted directly.
-// I.e. not as an offset to a section symbol.
-// This code is an approximation of what ARM/gcc does.
-
-STATISTIC(PCRelCount, "Total number of PIC Relocations");
-STATISTIC(NonPCRelCount, "Total number of non-PIC relocations");
-
-const MCSymbol *ARMELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
- const MCValue &Target,
- const MCFragment &F,
- const MCFixup &Fixup,
- bool IsPCRel) const {
- const MCSymbol &Symbol = Target.getSymA()->getSymbol();
- bool EmitThisSym = false;
-
- const MCSectionELF &Section =
- static_cast<const MCSectionELF&>(Symbol.getSection());
- bool InNormalSection = true;
- unsigned RelocType = 0;
- RelocType = GetRelocTypeInner(Target, Fixup, IsPCRel);
-
- DEBUG(
- const MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind();
- MCSymbolRefExpr::VariantKind Kind2;
- Kind2 = Target.getSymB() ? Target.getSymB()->getKind() :
- MCSymbolRefExpr::VK_None;
- dbgs() << "considering symbol "
- << Section.getSectionName() << "/"
- << Symbol.getName() << "/"
- << " Rel:" << (unsigned)RelocType
- << " Kind: " << (int)Kind << "/" << (int)Kind2
- << " Tmp:"
- << Symbol.isAbsolute() << "/" << Symbol.isDefined() << "/"
- << Symbol.isVariable() << "/" << Symbol.isTemporary()
- << " Counts:" << PCRelCount << "/" << NonPCRelCount << "\n");
-
- if (IsPCRel) { ++PCRelCount;
- switch (RelocType) {
- default:
- // Most relocation types are emitted as explicit symbols
- InNormalSection =
- StringSwitch<bool>(Section.getSectionName())
- .Case(".data.rel.ro.local", false)
- .Case(".data.rel", false)
- .Case(".bss", false)
- .Default(true);
- EmitThisSym = true;
- break;
- case ELF::R_ARM_ABS32:
- // But things get strange with R_ARM_ABS32
- // In this case, most things that go in .rodata show up
- // as section relative relocations
- InNormalSection =
- StringSwitch<bool>(Section.getSectionName())
- .Case(".data.rel.ro.local", false)
- .Case(".data.rel", false)
- .Case(".rodata", false)
- .Case(".bss", false)
- .Default(true);
- EmitThisSym = false;
- break;
- }
- } else {
- NonPCRelCount++;
- InNormalSection =
- StringSwitch<bool>(Section.getSectionName())
- .Case(".data.rel.ro.local", false)
- .Case(".rodata", false)
- .Case(".data.rel", false)
- .Case(".bss", false)
- .Default(true);
-
- switch (RelocType) {
- default: EmitThisSym = true; break;
- case ELF::R_ARM_ABS32: EmitThisSym = false; break;
- }
- }
-
- if (EmitThisSym)
- return &Symbol;
- if (! Symbol.isTemporary() && InNormalSection) {
- return &Symbol;
- }
- return NULL;
-}
-
-// Need to examine the Fixup when determining whether to
-// emit the relocation as an explicit symbol or as a section relative
-// offset
-unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
- const MCFixup &Fixup,
- bool IsPCRel,
- bool IsRelocWithSymbol,
- int64_t Addend) {
- MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
- MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
-
- unsigned Type = GetRelocTypeInner(Target, Fixup, IsPCRel);
-
- if (RelocNeedsGOT(Modifier))
- NeedsGOT = true;
-
- return Type;
-}
-
-unsigned ARMELFObjectWriter::GetRelocTypeInner(const MCValue &Target,
- const MCFixup &Fixup,
- bool IsPCRel) const {
- MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
- MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
-
- unsigned Type = 0;
- if (IsPCRel) {
- switch ((unsigned)Fixup.getKind()) {
- default: assert(0 && "Unimplemented");
- case FK_Data_4:
- switch (Modifier) {
- default: llvm_unreachable("Unsupported Modifier");
- case MCSymbolRefExpr::VK_None:
- Type = ELF::R_ARM_REL32;
- break;
- case MCSymbolRefExpr::VK_ARM_TLSGD:
- assert(0 && "unimplemented");
- break;
- case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
- Type = ELF::R_ARM_TLS_IE32;
- break;
- }
- break;
- case ARM::fixup_arm_uncondbranch:
- switch (Modifier) {
- case MCSymbolRefExpr::VK_ARM_PLT:
- Type = ELF::R_ARM_PLT32;
- break;
- default:
- Type = ELF::R_ARM_CALL;
- break;
- }
- break;
- case ARM::fixup_arm_condbranch:
- Type = ELF::R_ARM_JUMP24;
- break;
- case ARM::fixup_arm_movt_hi16:
- case ARM::fixup_arm_movt_hi16_pcrel:
- Type = ELF::R_ARM_MOVT_PREL;
- break;
- case ARM::fixup_arm_movw_lo16:
- case ARM::fixup_arm_movw_lo16_pcrel:
- Type = ELF::R_ARM_MOVW_PREL_NC;
- break;
- case ARM::fixup_t2_movt_hi16:
- case ARM::fixup_t2_movt_hi16_pcrel:
- Type = ELF::R_ARM_THM_MOVT_PREL;
- break;
- case ARM::fixup_t2_movw_lo16:
- case ARM::fixup_t2_movw_lo16_pcrel:
- Type = ELF::R_ARM_THM_MOVW_PREL_NC;
- break;
- case ARM::fixup_arm_thumb_bl:
- case ARM::fixup_arm_thumb_blx:
- switch (Modifier) {
- case MCSymbolRefExpr::VK_ARM_PLT:
- Type = ELF::R_ARM_THM_CALL;
- break;
- default:
- Type = ELF::R_ARM_NONE;
- break;
- }
- break;
- }
- } else {
- switch ((unsigned)Fixup.getKind()) {
- default: llvm_unreachable("invalid fixup kind!");
- case FK_Data_4:
- switch (Modifier) {
- default: llvm_unreachable("Unsupported Modifier"); break;
- case MCSymbolRefExpr::VK_ARM_GOT:
- Type = ELF::R_ARM_GOT_BREL;
- break;
- case MCSymbolRefExpr::VK_ARM_TLSGD:
- Type = ELF::R_ARM_TLS_GD32;
- break;
- case MCSymbolRefExpr::VK_ARM_TPOFF:
- Type = ELF::R_ARM_TLS_LE32;
- break;
- case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
- Type = ELF::R_ARM_TLS_IE32;
- break;
- case MCSymbolRefExpr::VK_None:
- Type = ELF::R_ARM_ABS32;
- break;
- case MCSymbolRefExpr::VK_ARM_GOTOFF:
- Type = ELF::R_ARM_GOTOFF32;
- break;
- }
- break;
- case ARM::fixup_arm_ldst_pcrel_12:
- case ARM::fixup_arm_pcrel_10:
- case ARM::fixup_arm_adr_pcrel_12:
- case ARM::fixup_arm_thumb_bl:
- case ARM::fixup_arm_thumb_cb:
- case ARM::fixup_arm_thumb_cp:
- case ARM::fixup_arm_thumb_br:
- assert(0 && "Unimplemented");
- break;
- case ARM::fixup_arm_uncondbranch:
- Type = ELF::R_ARM_CALL;
- break;
- case ARM::fixup_arm_condbranch:
- Type = ELF::R_ARM_JUMP24;
- break;
- case ARM::fixup_arm_movt_hi16:
- Type = ELF::R_ARM_MOVT_ABS;
- break;
- case ARM::fixup_arm_movw_lo16:
- Type = ELF::R_ARM_MOVW_ABS_NC;
- break;
- case ARM::fixup_t2_movt_hi16:
- Type = ELF::R_ARM_THM_MOVT_ABS;
- break;
- case ARM::fixup_t2_movw_lo16:
- Type = ELF::R_ARM_THM_MOVW_ABS_NC;
- break;
- }
- }
-
- return Type;
-}
-
-//===- PPCELFObjectWriter -------------------------------------------===//
-
-PPCELFObjectWriter::PPCELFObjectWriter(MCELFObjectTargetWriter *MOTW,
- raw_ostream &_OS,
- bool IsLittleEndian)
- : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {
-}
-
-PPCELFObjectWriter::~PPCELFObjectWriter() {
-}
-
-unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
- const MCFixup &Fixup,
- bool IsPCRel,
- bool IsRelocWithSymbol,
- int64_t Addend) {
- // 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_BRTAKEN; // XXX: or BRNTAKEN?_
- break;
- case PPC::fixup_ppc_ha16:
- Type = ELF::R_PPC_ADDR16_HA;
- break;
- case PPC::fixup_ppc_lo16:
- Type = ELF::R_PPC_ADDR16_LO;
- break;
- case PPC::fixup_ppc_lo14:
- Type = ELF::R_PPC_ADDR14;
- break;
- case FK_Data_4:
- Type = ELF::R_PPC_ADDR32;
- break;
- case FK_Data_2:
- Type = ELF::R_PPC_ADDR16;
- break;
- }
- }
- return Type;
-}
-
-void
-PPCELFObjectWriter::adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset) {
- switch ((unsigned)Fixup.getKind()) {
- case PPC::fixup_ppc_ha16:
- case PPC::fixup_ppc_lo16:
- RelocOffset += 2;
- break;
- default:
- break;
- }
-}
-
-//===- MBlazeELFObjectWriter -------------------------------------------===//
-
-MBlazeELFObjectWriter::MBlazeELFObjectWriter(MCELFObjectTargetWriter *MOTW,
- raw_ostream &_OS,
- bool IsLittleEndian)
- : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {
-}
-
-MBlazeELFObjectWriter::~MBlazeELFObjectWriter() {
-}
-
-unsigned MBlazeELFObjectWriter::GetRelocType(const MCValue &Target,
- const MCFixup &Fixup,
- bool IsPCRel,
- bool IsRelocWithSymbol,
- int64_t Addend) {
- // determine the type of the relocation
- unsigned Type;
- if (IsPCRel) {
- switch ((unsigned)Fixup.getKind()) {
- default:
- llvm_unreachable("Unimplemented");
- case FK_PCRel_4:
- Type = ELF::R_MICROBLAZE_64_PCREL;
- break;
- case FK_PCRel_2:
- Type = ELF::R_MICROBLAZE_32_PCREL;
- break;
- }
- } else {
- switch ((unsigned)Fixup.getKind()) {
- default: llvm_unreachable("invalid fixup kind!");
- case FK_Data_4:
- Type = ((IsRelocWithSymbol || Addend !=0)
- ? ELF::R_MICROBLAZE_32
- : ELF::R_MICROBLAZE_64);
- break;
- case FK_Data_2:
- Type = ELF::R_MICROBLAZE_32;
- break;
- }
- }
- return Type;
-}
-
-//===- X86ELFObjectWriter -------------------------------------------===//
-
-
-X86ELFObjectWriter::X86ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
- raw_ostream &_OS,
- bool IsLittleEndian)
- : ELFObjectWriter(MOTW, _OS, IsLittleEndian)
-{}
-
-X86ELFObjectWriter::~X86ELFObjectWriter()
-{}
-
-unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
- const MCFixup &Fixup,
- bool IsPCRel,
- bool IsRelocWithSymbol,
- int64_t Addend) {
- // determine the type of the relocation
-
- MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
- MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
- unsigned Type;
- if (is64Bit()) {
- if (IsPCRel) {
- switch ((unsigned)Fixup.getKind()) {
- default: llvm_unreachable("invalid fixup kind!");
-
- case FK_Data_8: Type = ELF::R_X86_64_PC64; break;
- case FK_Data_4: Type = ELF::R_X86_64_PC32; break;
- case FK_Data_2: Type = ELF::R_X86_64_PC16; break;
-
- case FK_PCRel_8:
- assert(Modifier == MCSymbolRefExpr::VK_None);
- Type = ELF::R_X86_64_PC64;
- break;
- case X86::reloc_signed_4byte:
- case X86::reloc_riprel_4byte_movq_load:
- case X86::reloc_riprel_4byte:
- case FK_PCRel_4:
- switch (Modifier) {
- default:
- llvm_unreachable("Unimplemented");
- case MCSymbolRefExpr::VK_None:
- Type = ELF::R_X86_64_PC32;
- break;
- case MCSymbolRefExpr::VK_PLT:
- Type = ELF::R_X86_64_PLT32;
- break;
- case MCSymbolRefExpr::VK_GOTPCREL:
- Type = ELF::R_X86_64_GOTPCREL;
- break;
- case MCSymbolRefExpr::VK_GOTTPOFF:
- Type = ELF::R_X86_64_GOTTPOFF;
- break;
- case MCSymbolRefExpr::VK_TLSGD:
- Type = ELF::R_X86_64_TLSGD;
- break;
- case MCSymbolRefExpr::VK_TLSLD:
- Type = ELF::R_X86_64_TLSLD;
- break;
- }
- break;
- case FK_PCRel_2:
- assert(Modifier == MCSymbolRefExpr::VK_None);
- Type = ELF::R_X86_64_PC16;
- break;
- case FK_PCRel_1:
- assert(Modifier == MCSymbolRefExpr::VK_None);
- Type = ELF::R_X86_64_PC8;
- break;
- }
- } else {
- switch ((unsigned)Fixup.getKind()) {
- default: llvm_unreachable("invalid fixup kind!");
- case FK_Data_8: Type = ELF::R_X86_64_64; break;
- case X86::reloc_signed_4byte:
- switch (Modifier) {
- default:
- llvm_unreachable("Unimplemented");
- case MCSymbolRefExpr::VK_None:
- Type = ELF::R_X86_64_32S;
- break;
- case MCSymbolRefExpr::VK_GOT:
- Type = ELF::R_X86_64_GOT32;
- break;
- case MCSymbolRefExpr::VK_GOTPCREL:
- Type = ELF::R_X86_64_GOTPCREL;
- break;
- case MCSymbolRefExpr::VK_TPOFF:
- Type = ELF::R_X86_64_TPOFF32;
- break;
- case MCSymbolRefExpr::VK_DTPOFF:
- Type = ELF::R_X86_64_DTPOFF32;
- break;
- }
- break;
- case FK_Data_4:
- Type = ELF::R_X86_64_32;
- break;
- case FK_Data_2: Type = ELF::R_X86_64_16; break;
- case FK_PCRel_1:
- case FK_Data_1: Type = ELF::R_X86_64_8; break;
- }
- }
- } else {
- if (IsPCRel) {
- switch (Modifier) {
- default:
- llvm_unreachable("Unimplemented");
- case MCSymbolRefExpr::VK_None:
- Type = ELF::R_386_PC32;
- break;
- case MCSymbolRefExpr::VK_PLT:
- Type = ELF::R_386_PLT32;
- break;
- }
- } else {
- switch ((unsigned)Fixup.getKind()) {
- default: llvm_unreachable("invalid fixup kind!");
-
- case X86::reloc_global_offset_table:
- Type = ELF::R_386_GOTPC;
- break;
-
- // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
- // instead?
- case X86::reloc_signed_4byte:
- case FK_PCRel_4:
- case FK_Data_4:
- switch (Modifier) {
- default:
- llvm_unreachable("Unimplemented");
- case MCSymbolRefExpr::VK_None:
- Type = ELF::R_386_32;
- break;
- case MCSymbolRefExpr::VK_GOT:
- Type = ELF::R_386_GOT32;
- break;
- case MCSymbolRefExpr::VK_GOTOFF:
- Type = ELF::R_386_GOTOFF;
- break;
- case MCSymbolRefExpr::VK_TLSGD:
- Type = ELF::R_386_TLS_GD;
- break;
- case MCSymbolRefExpr::VK_TPOFF:
- Type = ELF::R_386_TLS_LE_32;
- break;
- case MCSymbolRefExpr::VK_INDNTPOFF:
- Type = ELF::R_386_TLS_IE;
- break;
- case MCSymbolRefExpr::VK_NTPOFF:
- Type = ELF::R_386_TLS_LE;
- break;
- case MCSymbolRefExpr::VK_GOTNTPOFF:
- Type = ELF::R_386_TLS_GOTIE;
- break;
- case MCSymbolRefExpr::VK_TLSLDM:
- Type = ELF::R_386_TLS_LDM;
- break;
- case MCSymbolRefExpr::VK_DTPOFF:
- Type = ELF::R_386_TLS_LDO_32;
- break;
- case MCSymbolRefExpr::VK_GOTTPOFF:
- Type = ELF::R_386_TLS_IE_32;
- break;
- }
- break;
- case FK_Data_2: Type = ELF::R_386_16; break;
- case FK_PCRel_1:
- case FK_Data_1: Type = ELF::R_386_8; break;
- }
- }
- }
-
- if (RelocNeedsGOT(Modifier))
- NeedsGOT = true;
-
- return Type;
-}
-
-MipsELFObjectWriter::MipsELFObjectWriter(MCELFObjectTargetWriter *MOTW,
- raw_ostream &_OS,
- bool IsLittleEndian)
- : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {}
-
-MipsELFObjectWriter::~MipsELFObjectWriter() {}
-
-unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
- const MCFixup &Fixup,
- bool IsPCRel,
- bool IsRelocWithSymbol,
- int64_t Addend) {
- // tbd
- return 1;
+ return new ELFObjectWriter(MOTW, OS, IsLittleEndian);
}
projects / oota-llvm.git / blobdiff