-//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -------------------===//
+//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -----------------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
-#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/MC/MCELFObjectWriter.h"
+#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/Twine.h"
-#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCELF.h"
#include "llvm/MC/MCELFSymbolFlags.h"
#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSectionELF.h"
-#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ELF.h"
-#include "llvm/Target/TargetAsmBackend.h"
-
-#include "../Target/X86/X86FixupKinds.h"
-#include "../Target/ARM/ARMFixupKinds.h"
-
+#include "llvm/Support/ErrorHandling.h"
#include <vector>
using namespace llvm;
-static unsigned GetType(const MCSymbolData &SD) {
- uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift;
- assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
- Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
- Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
- Type == ELF::STT_TLS);
- return Type;
-}
-
-static unsigned GetBinding(const MCSymbolData &SD) {
- uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift;
- assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
- Binding == ELF::STB_WEAK);
- return Binding;
-}
-
-static void SetBinding(MCSymbolData &SD, unsigned Binding) {
- assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
- Binding == ELF::STB_WEAK);
- uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift);
- SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift));
-}
-
-static unsigned GetVisibility(MCSymbolData &SD) {
- unsigned Visibility =
- (SD.getFlags() & (0xf << ELF_STV_Shift)) >> ELF_STV_Shift;
- assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
- Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
- return Visibility;
-}
-
-
-static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) {
- switch (Variant) {
- default:
- return false;
- case MCSymbolRefExpr::VK_GOT:
- case MCSymbolRefExpr::VK_PLT:
- case MCSymbolRefExpr::VK_GOTPCREL:
- case MCSymbolRefExpr::VK_TPOFF:
- case MCSymbolRefExpr::VK_TLSGD:
- case MCSymbolRefExpr::VK_GOTTPOFF:
- case MCSymbolRefExpr::VK_INDNTPOFF:
- case MCSymbolRefExpr::VK_NTPOFF:
- case MCSymbolRefExpr::VK_GOTNTPOFF:
- case MCSymbolRefExpr::VK_TLSLDM:
- case MCSymbolRefExpr::VK_DTPOFF:
- case MCSymbolRefExpr::VK_TLSLD:
- return true;
- }
-}
+#undef DEBUG_TYPE
+#define DEBUG_TYPE "reloc-info"
namespace {
- class ELFObjectWriter : public MCObjectWriter {
+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.
+ /// ELFSymbolData - Helper struct for containing some precomputed
+ /// information on symbols.
struct ELFSymbolData {
MCSymbolData *SymbolData;
uint64_t StringIndex;
// Support lexicographic sorting.
bool operator<(const ELFSymbolData &RHS) const {
- if (GetType(*SymbolData) == ELF::STT_FILE)
+ if (MCELF::GetType(*SymbolData) == ELF::STT_FILE)
return true;
- if (GetType(*RHS.SymbolData) == ELF::STT_FILE)
+ 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;
bool NeedsSymtabShndx;
- unsigned Is64Bit : 1;
-
- bool HasRelocationAddend;
-
- Triple::OSType OSType;
-
- uint16_t EMachine;
-
// This holds the symbol table index of the last local symbol.
unsigned LastLocalSymbolIndex;
// This holds the .strtab section index.
const MCSymbol *SymbolToReloc(const MCAssembler &Asm,
const MCValue &Target,
- const MCFragment &F) const;
+ 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);
+ }
+ const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
+ const MCFixup &Fixup,
+ bool IsPCRel) const {
+ return TargetObjectWriter->undefinedExplicitRelSym(Target, Fixup,
+ IsPCRel);
+ }
+
+ bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
+ bool hasRelocationAddend() const {
+ return TargetObjectWriter->hasRelocationAddend();
+ }
+ 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(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
- uint16_t _EMachine, bool _HasRelAddend,
- Triple::OSType _OSType)
+ ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS, bool IsLittleEndian)
: MCObjectWriter(_OS, IsLittleEndian),
- NeedsGOT(false), NeedsSymtabShndx(false),
- Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend),
- OSType(_OSType), EMachine(_EMachine) {
+ TargetObjectWriter(MOTW),
+ NeedsGOT(false), NeedsSymtabShndx(false) {
}
virtual ~ELFObjectWriter();
void WriteWord(uint64_t W) {
- if (Is64Bit)
+ if (is64Bit())
Write64(W);
else
Write32(W);
void String8(MCDataFragment &F, uint8_t Value) {
char buf[1];
buf[0] = Value;
- F.getContents() += StringRef(buf, 1);
+ F.getContents().append(&buf[0], &buf[1]);
}
void String16(MCDataFragment &F, uint16_t Value) {
StringLE16(buf, Value);
else
StringBE16(buf, Value);
- F.getContents() += StringRef(buf, 2);
+ F.getContents().append(&buf[0], &buf[2]);
}
void String32(MCDataFragment &F, uint32_t Value) {
StringLE32(buf, Value);
else
StringBE32(buf, Value);
- F.getContents() += StringRef(buf, 4);
+ F.getContents().append(&buf[0], &buf[4]);
}
void String64(MCDataFragment &F, uint64_t Value) {
StringLE64(buf, Value);
else
StringBE64(buf, Value);
- F.getContents() += StringRef(buf, 8);
+ F.getContents().append(&buf[0], &buf[8]);
}
- virtual void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections);
+ void WriteHeader(const MCAssembler &Asm,
+ uint64_t SectionDataSize,
+ unsigned NumberOfSections);
- virtual void WriteSymbolEntry(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
+ 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);
- virtual void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
+ void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
ELFSymbolData &MSD,
const MCAsmLayout &Layout);
typedef DenseMap<const MCSectionELF*, uint32_t> SectionIndexMapTy;
- virtual void WriteSymbolTable(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
+ 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,
+ virtual void RecordRelocation(const MCAssembler &Asm,
+ const MCAsmLayout &Layout,
+ const MCFragment *Fragment,
+ const MCFixup &Fixup,
MCValue Target, uint64_t &FixedValue);
- virtual uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm,
+ 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.
- virtual void ComputeSymbolTable(MCAssembler &Asm,
+ /// \param Asm - The assembler.
+ /// \param SectionIndexMap - Maps a section to its index.
+ /// \param RevGroupMap - Maps a signature symbol to the group section.
+ /// \param NumRegularSections - Number of non-relocation sections.
+ void ComputeSymbolTable(MCAssembler &Asm,
const SectionIndexMapTy &SectionIndexMap,
- RevGroupMapTy RevGroupMap);
+ RevGroupMapTy RevGroupMap,
+ unsigned NumRegularSections);
- virtual void ComputeIndexMap(MCAssembler &Asm,
- SectionIndexMapTy &SectionIndexMap);
+ void ComputeIndexMap(MCAssembler &Asm,
+ SectionIndexMapTy &SectionIndexMap,
+ const RelMapTy &RelMap);
- virtual void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout,
- const MCSectionData &SD);
+ void CreateRelocationSections(MCAssembler &Asm, MCAsmLayout &Layout,
+ RelMapTy &RelMap);
- virtual void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) {
- for (MCAssembler::const_iterator it = Asm.begin(),
- ie = Asm.end(); it != ie; ++it) {
- WriteRelocation(Asm, Layout, *it);
- }
- }
+ void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout,
+ const RelMapTy &RelMap);
- virtual void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout,
- const SectionIndexMapTy &SectionIndexMap);
+ void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout,
+ SectionIndexMapTy &SectionIndexMap,
+ const RelMapTy &RelMap);
- virtual void CreateGroupSections(MCAssembler &Asm, MCAsmLayout &Layout,
- GroupMapTy &GroupMap, RevGroupMapTy &RevGroupMap);
+ // 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);
- virtual void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags,
+ 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);
- virtual void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F,
+ void WriteRelocationsFragment(const MCAssembler &Asm,
+ MCDataFragment *F,
const MCSectionData *SD);
- virtual bool IsFixupFullyResolved(const MCAssembler &Asm,
- const MCValue Target,
- bool IsPCRel,
- const MCFragment *DF) const;
+ 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);
- virtual void WriteSection(MCAssembler &Asm,
+ void WriteSection(MCAssembler &Asm,
const SectionIndexMapTy &SectionIndexMap,
uint32_t GroupSymbolIndex,
uint64_t Offset, uint64_t Size, uint64_t Alignment,
const MCSectionELF &Section);
-
- protected:
- virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
- bool IsPCRel, bool IsRelocWithSymbol,
- int64_t Addend) = 0;
-
- virtual bool isFixupKindPCRel(unsigned Kind) const = 0;
- };
-
- //===- X86ELFObjectWriter -------------------------------------------===//
-
- class X86ELFObjectWriter : public ELFObjectWriter {
- public:
- X86ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
- uint16_t _EMachine, bool _HasRelAddend,
- Triple::OSType _OSType);
-
- virtual ~X86ELFObjectWriter();
- protected:
- virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
- bool IsPCRel, bool IsRelocWithSymbol,
- int64_t Addend);
-
- virtual bool isFixupKindPCRel(unsigned Kind) const {
- switch (Kind) {
- default:
- return false;
- case FK_PCRel_1:
- case FK_PCRel_2:
- case FK_PCRel_4:
- case X86::reloc_riprel_4byte:
- case X86::reloc_riprel_4byte_movq_load:
- return true;
- }
- }
- };
-
-
- //===- ARMELFObjectWriter -------------------------------------------===//
-
- class ARMELFObjectWriter : public ELFObjectWriter {
- public:
- ARMELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
- uint16_t _EMachine, bool _HasRelAddend,
- Triple::OSType _OSType);
-
- virtual ~ARMELFObjectWriter();
- protected:
- virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
- bool IsPCRel, bool IsRelocWithSymbol,
- int64_t Addend);
- virtual bool isFixupKindPCRel(unsigned Kind) const {
- switch (Kind) {
- default:
- return false;
- case FK_PCRel_1:
- case FK_PCRel_2:
- case FK_PCRel_4:
- case ARM::fixup_arm_ldst_pcrel_12:
- case ARM::fixup_arm_pcrel_10:
- case ARM::fixup_arm_branch:
- return true;
- }
- }
};
+}
- //===- MBlazeELFObjectWriter -------------------------------------------===//
+bool ELFObjectWriter::isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind) {
+ const MCFixupKindInfo &FKI =
+ Asm.getBackend().getFixupKindInfo((MCFixupKind) Kind);
- class MBlazeELFObjectWriter : public ELFObjectWriter {
- public:
- MBlazeELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
- uint16_t _EMachine, bool _HasRelAddend,
- Triple::OSType _OSType);
+ return FKI.Flags & MCFixupKindInfo::FKF_IsPCRel;
+}
- virtual ~MBlazeELFObjectWriter();
- protected:
- virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
- bool IsPCRel, bool IsRelocWithSymbol,
- int64_t Addend);
-
- virtual bool isFixupKindPCRel(unsigned Kind) const {
- switch (Kind) {
- default:
- return false;
- case FK_PCRel_1:
- case FK_PCRel_2:
- case FK_PCRel_4:
- return true;
- }
- }
- };
+bool ELFObjectWriter::RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) {
+ switch (Variant) {
+ default:
+ return false;
+ case MCSymbolRefExpr::VK_GOT:
+ case MCSymbolRefExpr::VK_PLT:
+ case MCSymbolRefExpr::VK_GOTPCREL:
+ case MCSymbolRefExpr::VK_GOTOFF:
+ case MCSymbolRefExpr::VK_TPOFF:
+ case MCSymbolRefExpr::VK_TLSGD:
+ case MCSymbolRefExpr::VK_GOTTPOFF:
+ case MCSymbolRefExpr::VK_INDNTPOFF:
+ case MCSymbolRefExpr::VK_NTPOFF:
+ case MCSymbolRefExpr::VK_GOTNTPOFF:
+ case MCSymbolRefExpr::VK_TLSLDM:
+ case MCSymbolRefExpr::VK_DTPOFF:
+ case MCSymbolRefExpr::VK_TLSLD:
+ return true;
+ }
}
ELFObjectWriter::~ELFObjectWriter()
{}
// Emit the ELF header.
-void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize,
+void ELFObjectWriter::WriteHeader(const MCAssembler &Asm,
+ uint64_t SectionDataSize,
unsigned NumberOfSections) {
// ELF Header
// ----------
Write8('L'); // e_ident[EI_MAG2]
Write8('F'); // e_ident[EI_MAG3]
- Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS]
+ Write8(is64Bit() ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS]
// e_ident[EI_DATA]
Write8(isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB);
Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION]
// e_ident[EI_OSABI]
- switch (OSType) {
- 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);
Write16(ELF::ET_REL); // e_type
- Write16(EMachine); // e_machine = target
+ Write16(TargetObjectWriter->getEMachine()); // e_machine = target
Write32(ELF::EV_CURRENT); // e_version
WriteWord(0); // e_entry, no entry point in .o file
WriteWord(0); // e_phoff, no program header for .o
- WriteWord(SectionDataSize + (Is64Bit ? sizeof(ELF::Elf64_Ehdr) :
+ WriteWord(SectionDataSize + (is64Bit() ? sizeof(ELF::Elf64_Ehdr) :
sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes
- // FIXME: Make this configurable.
- Write32(0); // e_flags = whatever the target wants
+ // e_flags = whatever the target wants
+ Write32(Asm.getELFHeaderEFlags());
// e_ehsize = ELF header size
- Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr));
+ Write16(is64Bit() ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr));
Write16(0); // e_phentsize = prog header entry size
Write16(0); // e_phnum = # prog header entries = 0
// e_shentsize = Section header entry size
- Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr));
+ Write16(is64Bit() ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr));
// 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);
uint16_t Index = (shndx >= ELF::SHN_LORESERVE && !Reserved) ?
uint16_t(ELF::SHN_XINDEX) : shndx;
- if (Is64Bit) {
+ if (is64Bit()) {
String32(*SymtabF, name); // st_name
String8(*SymtabF, info); // st_info
String8(*SymtabF, other); // st_other
}
}
-static uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) {
+uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &Data,
+ const MCAsmLayout &Layout) {
if (Data.isCommon() && Data.isExternal())
return Data.getCommonAlignment();
const MCSymbol &Symbol = Data.getSymbol();
+
+ if (Symbol.isAbsolute() && Symbol.isVariable()) {
+ if (const MCExpr *Value = Symbol.getVariableValue()) {
+ int64_t IntValue;
+ if (Value->EvaluateAsAbsolute(IntValue, Layout))
+ return (uint64_t)IntValue;
+ }
+ }
+
if (!Symbol.isInSection())
return 0;
- if (Data.getFragment())
- return Layout.getSymbolOffset(&Data);
+
+ if (Data.getFragment()) {
+ if (Data.getFlags() & ELF_Other_ThumbFunc)
+ return Layout.getSymbolOffset(&Data)+1;
+ else
+ return Layout.getSymbolOffset(&Data);
+ }
return 0;
}
// Aliases defined with .symvar copy the binding from the symbol they alias.
// This is the first place we are able to copy this information.
it->setExternal(SD.isExternal());
- SetBinding(*it, GetBinding(SD));
+ MCELF::SetBinding(*it, MCELF::GetBinding(SD));
StringRef Rest = AliasName.substr(Pos);
if (!Symbol.isUndefined() && !Rest.startswith("@@@"))
bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() ||
Data.getSymbol().isVariable();
- uint8_t Binding = GetBinding(OrigData);
- uint8_t Visibility = GetVisibility(OrigData);
- uint8_t Type = GetType(Data);
-
+ // Binding and Type share the same byte as upper and lower nibbles
+ uint8_t Binding = MCELF::GetBinding(OrigData);
+ uint8_t Type = MCELF::GetType(Data);
uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift);
- uint8_t Other = Visibility;
+
+ // Other and Visibility share the same byte with Visability using the lower
+ // 2 bits
+ uint8_t Visibility = MCELF::GetVisibility(OrigData);
+ uint8_t Other = MCELF::getOther(OrigData) <<
+ (ELF_Other_Shift - ELF_STV_Shift);
+ Other |= Visibility;
uint64_t Value = SymbolValue(Data, Layout);
uint64_t Size = 0;
- const MCExpr *ESize;
assert(!(Data.isCommon() && !Data.isExternal()));
- ESize = Data.getSize();
- if (Data.getSize()) {
- MCValue Res;
- if (ESize->getKind() == MCExpr::Binary) {
- const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize);
-
- if (BE->EvaluateAsRelocatable(Res, &Layout)) {
- assert(!Res.getSymA() || !Res.getSymA()->getSymbol().isDefined());
- assert(!Res.getSymB() || !Res.getSymB()->getSymbol().isDefined());
- Size = Res.getConstant();
- }
- } else if (ESize->getKind() == MCExpr::Constant) {
- Size = static_cast<const MCConstantExpr *>(ESize)->getValue();
- } else {
- assert(0 && "Unsupported size expression");
- }
+ const MCExpr *ESize = Data.getSize();
+ if (ESize) {
+ int64_t Res;
+ if (!ESize->EvaluateAsAbsolute(Res, Layout))
+ report_fatal_error("Size expression must be absolute.");
+ Size = Res;
}
// Write out the symbol table entry
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++;
}
(Data.getFlags() & ELF_STB_Weak)) &&
"External symbol requires STB_GLOBAL or STB_WEAK flag");
WriteSymbol(SymtabF, ShndxF, MSD, Layout);
- if (GetBinding(Data) == ELF::STB_LOCAL)
+ if (MCELF::GetBinding(Data) == ELF::STB_LOCAL)
LastLocalSymbolIndex++;
}
ELFSymbolData &MSD = UndefinedSymbolData[i];
MCSymbolData &Data = *MSD.SymbolData;
WriteSymbol(SymtabF, ShndxF, MSD, Layout);
- if (GetBinding(Data) == ELF::STB_LOCAL)
+ if (MCELF::GetBinding(Data) == ELF::STB_LOCAL)
LastLocalSymbolIndex++;
}
}
const MCSymbol *ELFObjectWriter::SymbolToReloc(const MCAssembler &Asm,
const MCValue &Target,
- const MCFragment &F) const {
+ const MCFragment &F,
+ const MCFixup &Fixup,
+ bool IsPCRel) const {
const MCSymbol &Symbol = Target.getSymA()->getSymbol();
const MCSymbol &ASymbol = Symbol.AliasedSymbol();
const MCSymbol *Renamed = Renames.lookup(&Symbol);
if (ASymbol.isUndefined()) {
if (Renamed)
return Renamed;
- return &ASymbol;
+ return undefinedExplicitRelSym(Target, Fixup, IsPCRel);
}
if (SD.isExternal()) {
const SectionKind secKind = Section.getKind();
if (secKind.isBSS())
- return NULL;
+ return ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel);
if (secKind.isThreadLocal()) {
if (Renamed)
return &Symbol;
}
- if (Section.getFlags() & MCSectionELF::SHF_MERGE) {
+ if (Section.getFlags() & ELF::SHF_MERGE) {
if (Target.getConstant() == 0)
- return NULL;
+ return ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel);
if (Renamed)
return Renamed;
return &Symbol;
}
- return NULL;
+ return ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel);
+
}
int64_t Value = Target.getConstant();
const MCSymbol *RelocSymbol = NULL;
- bool IsPCRel = isFixupKindPCRel(Fixup.getKind());
+ bool IsPCRel = isFixupKindPCRel(Asm, Fixup.getKind());
if (!Target.isAbsolute()) {
const MCSymbol &Symbol = Target.getSymA()->getSymbol();
const MCSymbol &ASymbol = Symbol.AliasedSymbol();
- RelocSymbol = SymbolToReloc(Asm, Target, *Fragment);
+ RelocSymbol = SymbolToReloc(Asm, Target, *Fragment, Fixup, IsPCRel);
if (const MCSymbolRefExpr *RefB = Target.getSymB()) {
const MCSymbol &SymbolB = RefB->getSymbol();
// 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;
}
MCSymbolData &SD = Asm.getSymbolData(ASymbol);
MCFragment *F = SD.getFragment();
- Index = F->getParent()->getOrdinal() + 1;
-
- // Offset of the symbol in the section
- Value += Layout.getSymbolOffset(&SD);
+ if (F) {
+ Index = F->getParent()->getOrdinal() + 1;
+ // Offset of the symbol in the section
+ Value += Layout.getSymbolOffset(&SD);
+ } else {
+ Index = 0;
+ }
} else {
if (Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref)
WeakrefUsedInReloc.insert(RelocSymbol);
Index = -1;
}
Addend = Value;
- // Compensate for the addend on i386.
- if (Is64Bit)
+ if (hasRelocationAddend())
Value = 0;
}
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();
- if (!HasRelocationAddend) Addend = 0;
- ELFRelocationEntry ERE(RelocOffset, Index, Type, RelocSymbol, Addend);
+ if (!hasRelocationAddend())
+ Addend = 0;
+
+ if (is64Bit())
+ assert(isInt<64>(Addend));
+ else
+ assert(isInt<32>(Addend));
+
+ ELFRelocationEntry ERE(RelocOffset, Index, Type, RelocSymbol, Addend, Fixup);
Relocations[Fragment->getParent()].push_back(ERE);
}
return SD.getIndex();
}
-static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data,
- bool Used, bool Renamed) {
+bool ELFObjectWriter::isInSymtab(const MCAssembler &Asm,
+ const MCSymbolData &Data,
+ bool Used, bool Renamed) {
if (Data.getFlags() & ELF_Other_Weakref)
return false;
return true;
const MCSymbol &A = Symbol.AliasedSymbol();
- if (!A.isVariable() && A.isUndefined() && !Data.isCommon())
+ if (Symbol.isVariable() && !A.isVariable() && A.isUndefined())
+ return false;
+
+ bool IsGlobal = MCELF::GetBinding(Data) == ELF::STB_GLOBAL;
+ if (!Symbol.isVariable() && Symbol.isUndefined() && !IsGlobal)
return false;
if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined())
return true;
}
-static bool isLocal(const MCSymbolData &Data, bool isSignature,
- bool isUsedInReloc) {
+bool ELFObjectWriter::isLocal(const MCSymbolData &Data, bool isSignature,
+ bool isUsedInReloc) {
if (Data.isExternal())
return false;
}
void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm,
- SectionIndexMapTy &SectionIndexMap) {
+ SectionIndexMapTy &SectionIndexMap,
+ const RelMapTy &RelMap) {
unsigned Index = 1;
for (MCAssembler::iterator it = Asm.begin(),
ie = Asm.end(); it != ie; ++it) {
ie = Asm.end(); it != ie; ++it) {
const MCSectionELF &Section =
static_cast<const MCSectionELF &>(it->getSection());
- if (Section.getType() == ELF::SHT_GROUP)
+ if (Section.getType() == ELF::SHT_GROUP ||
+ Section.getType() == ELF::SHT_REL ||
+ Section.getType() == ELF::SHT_RELA)
continue;
SectionIndexMap[&Section] = Index++;
+ const MCSectionELF *RelSection = RelMap.lookup(&Section);
+ if (RelSection)
+ SectionIndexMap[RelSection] = Index++;
}
}
void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm,
const SectionIndexMapTy &SectionIndexMap,
- RevGroupMapTy RevGroupMap) {
+ RevGroupMapTy RevGroupMap,
+ unsigned NumRegularSections) {
// FIXME: Is this the correct place to do this?
+ // FIXME: Why is an undefined reference to _GLOBAL_OFFSET_TABLE_ needed?
if (NeedsGOT) {
- llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_";
+ StringRef Name = "_GLOBAL_OFFSET_TABLE_";
MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name);
MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym);
Data.setExternal(true);
- SetBinding(Data, ELF::STB_GLOBAL);
+ MCELF::SetBinding(Data, ELF::STB_GLOBAL);
}
- // Build section lookup table.
- int NumRegularSections = Asm.size();
-
// Index 0 is always the empty string.
StringMap<uint64_t> StringIndexMap;
StringTable += '\x00';
+ // FIXME: We could optimize suffixes in strtab in the same way we
+ // optimize them in shstrtab.
+
// Add the data for the symbols.
for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
ie = Asm.symbol_end(); it != ie; ++it) {
// Undefined symbols are global, but this is the first place we
// are able to set it.
bool Local = isLocal(*it, isSignature, Used);
- if (!Local && GetBinding(*it) == ELF::STB_LOCAL) {
+ if (!Local && MCELF::GetBinding(*it) == ELF::STB_LOCAL) {
MCSymbolData &SD = Asm.getSymbolData(RefSymbol);
- SetBinding(*it, ELF::STB_GLOBAL);
- SetBinding(SD, ELF::STB_GLOBAL);
+ MCELF::SetBinding(*it, ELF::STB_GLOBAL);
+ MCELF::SetBinding(SD, ELF::STB_GLOBAL);
}
if (RefSymbol.isUndefined() && !Used && WeakrefUsed)
- SetBinding(*it, ELF::STB_WEAK);
+ MCELF::SetBinding(*it, ELF::STB_WEAK);
if (it->isCommon()) {
assert(!Local);
ExternalSymbolData[i].SymbolData->setIndex(Index++);
for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
UndefinedSymbolData[i].SymbolData->setIndex(Index++);
+
+ if (Index >= ELF::SHN_LORESERVE)
+ NeedsSymtabShndx = true;
}
-void ELFObjectWriter::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout,
- const MCSectionData &SD) {
- if (!Relocations[&SD].empty()) {
+void ELFObjectWriter::CreateRelocationSections(MCAssembler &Asm,
+ MCAsmLayout &Layout,
+ RelMapTy &RelMap) {
+ for (MCAssembler::const_iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it) {
+ const MCSectionData &SD = *it;
+ if (Relocations[&SD].empty())
+ continue;
+
MCContext &Ctx = Asm.getContext();
- const MCSectionELF *RelaSection;
const MCSectionELF &Section =
static_cast<const MCSectionELF&>(SD.getSection());
const StringRef SectionName = Section.getSectionName();
- std::string RelaSectionName = HasRelocationAddend ? ".rela" : ".rel";
+ std::string RelaSectionName = hasRelocationAddend() ? ".rela" : ".rel";
RelaSectionName += SectionName;
unsigned EntrySize;
- if (HasRelocationAddend)
- EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela);
+ if (hasRelocationAddend())
+ EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela);
else
- EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
+ EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
+
+ const MCSectionELF *RelaSection =
+ Ctx.getELFSection(RelaSectionName, hasRelocationAddend() ?
+ ELF::SHT_RELA : ELF::SHT_REL, 0,
+ SectionKind::getReadOnly(),
+ EntrySize, "");
+ RelMap[&Section] = RelaSection;
+ Asm.getOrCreateSectionData(*RelaSection);
+ }
+}
- RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ?
- ELF::SHT_RELA : ELF::SHT_REL, 0,
- SectionKind::getReadOnly(),
- EntrySize, "");
+void ELFObjectWriter::WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout,
+ const RelMapTy &RelMap) {
+ for (MCAssembler::const_iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it) {
+ const MCSectionData &SD = *it;
+ const MCSectionELF &Section =
+ static_cast<const MCSectionELF&>(SD.getSection());
+ const MCSectionELF *RelaSection = RelMap.lookup(&Section);
+ if (!RelaSection)
+ continue;
MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection);
- RelaSD.setAlignment(Is64Bit ? 8 : 4);
+ RelaSD.setAlignment(is64Bit() ? 8 : 4);
MCDataFragment *F = new MCDataFragment(&RelaSD);
-
- WriteRelocationsFragment(Asm, F, &SD);
+ WriteRelocationsFragment(Asm, F, &*it);
}
}
MCDataFragment *F,
const MCSectionData *SD) {
std::vector<ELFRelocationEntry> &Relocs = Relocations[SD];
- // sort by the r_offset just like gnu as does
- array_pod_sort(Relocs.begin(), Relocs.end());
+
+ // Sort the relocation entries. Most targets just sort by r_offset, but some
+ // (e.g., MIPS) have additional constraints.
+ TargetObjectWriter->sortRelocs(Asm, Relocs);
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
ELFRelocationEntry entry = Relocs[e - i - 1];
entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol);
else
entry.Index += LocalSymbolData.size();
- if (Is64Bit) {
+ if (is64Bit()) {
String64(*F, entry.r_offset);
+ if (TargetObjectWriter->isN64()) {
+ String32(*F, entry.Index);
- struct ELF::Elf64_Rela ERE64;
- ERE64.setSymbolAndType(entry.Index, entry.Type);
- String64(*F, ERE64.r_info);
-
- if (HasRelocationAddend)
+ String8(*F, TargetObjectWriter->getRSsym(entry.Type));
+ String8(*F, TargetObjectWriter->getRType3(entry.Type));
+ String8(*F, TargetObjectWriter->getRType2(entry.Type));
+ String8(*F, TargetObjectWriter->getRType(entry.Type));
+ }
+ else {
+ struct ELF::Elf64_Rela ERE64;
+ ERE64.setSymbolAndType(entry.Index, entry.Type);
+ String64(*F, ERE64.r_info);
+ }
+ if (hasRelocationAddend())
String64(*F, entry.r_addend);
} else {
String32(*F, entry.r_offset);
ERE32.setSymbolAndType(entry.Index, entry.Type);
String32(*F, ERE32.r_info);
- if (HasRelocationAddend)
+ if (hasRelocationAddend())
String32(*F, entry.r_addend);
}
}
}
+static int compareBySuffix(const void *a, const void *b) {
+ const MCSectionELF *secA = *static_cast<const MCSectionELF* const *>(a);
+ const MCSectionELF *secB = *static_cast<const MCSectionELF* const *>(b);
+ const StringRef &NameA = secA->getSectionName();
+ const StringRef &NameB = secB->getSectionName();
+ const unsigned sizeA = NameA.size();
+ const unsigned sizeB = NameB.size();
+ const unsigned len = std::min(sizeA, sizeB);
+ for (unsigned int i = 0; i < len; ++i) {
+ char ca = NameA[sizeA - i - 1];
+ char cb = NameB[sizeB - i - 1];
+ if (ca != cb)
+ return cb - ca;
+ }
+
+ return sizeB - sizeA;
+}
+
void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
MCAsmLayout &Layout,
- const SectionIndexMapTy &SectionIndexMap) {
+ SectionIndexMapTy &SectionIndexMap,
+ const RelMapTy &RelMap) {
MCContext &Ctx = Asm.getContext();
MCDataFragment *F;
- unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32;
+ unsigned EntrySize = is64Bit() ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32;
// We construct .shstrtab, .symtab and .strtab in this order to match gnu as.
const MCSectionELF *ShstrtabSection =
SectionKind::getReadOnly());
MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection);
ShstrtabSD.setAlignment(1);
- ShstrtabIndex = Asm.size();
const MCSectionELF *SymtabSection =
Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0,
SectionKind::getReadOnly(),
EntrySize, "");
MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection);
- SymtabSD.setAlignment(Is64Bit ? 8 : 4);
- SymbolTableIndex = Asm.size();
+ SymtabSD.setAlignment(is64Bit() ? 8 : 4);
MCSectionData *SymtabShndxSD = NULL;
SymtabShndxSD->setAlignment(4);
}
- const MCSection *StrtabSection;
+ const MCSectionELF *StrtabSection;
StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0,
SectionKind::getReadOnly());
MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection);
StrtabSD.setAlignment(1);
- StringTableIndex = Asm.size();
- WriteRelocations(Asm, Layout);
+ ComputeIndexMap(Asm, SectionIndexMap, RelMap);
+
+ ShstrtabIndex = SectionIndexMap.lookup(ShstrtabSection);
+ SymbolTableIndex = SectionIndexMap.lookup(SymtabSection);
+ StringTableIndex = SectionIndexMap.lookup(StrtabSection);
// Symbol table
F = new MCDataFragment(&SymtabSD);
F = new MCDataFragment(&ShstrtabSD);
+ std::vector<const MCSectionELF*> Sections;
+ for (MCAssembler::const_iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it) {
+ const MCSectionELF &Section =
+ static_cast<const MCSectionELF&>(it->getSection());
+ Sections.push_back(&Section);
+ }
+ array_pod_sort(Sections.begin(), Sections.end(), compareBySuffix);
+
// Section header string table.
//
// The first entry of a string table holds a null character so skip
// section 0.
uint64_t Index = 1;
- F->getContents() += '\x00';
+ F->getContents().push_back('\x00');
- StringMap<uint64_t> SecStringMap;
- for (MCAssembler::const_iterator it = Asm.begin(),
- ie = Asm.end(); it != ie; ++it) {
- const MCSectionELF &Section =
- static_cast<const MCSectionELF&>(it->getSection());
- // FIXME: We could merge suffixes like in .text and .rela.text.
+ for (unsigned int I = 0, E = Sections.size(); I != E; ++I) {
+ const MCSectionELF &Section = *Sections[I];
StringRef Name = Section.getSectionName();
- if (SecStringMap.count(Name)) {
- SectionStringTableIndex[&Section] = SecStringMap[Name];
- continue;
+ if (I != 0) {
+ StringRef PreviousName = Sections[I - 1]->getSectionName();
+ if (PreviousName.endswith(Name)) {
+ SectionStringTableIndex[&Section] = Index - Name.size() - 1;
+ continue;
+ }
}
// Remember the index into the string table so we can write it
// into the sh_name field of the section header table.
SectionStringTableIndex[&Section] = Index;
- SecStringMap[Name] = Index;
Index += Name.size() + 1;
- F->getContents() += Name;
- F->getContents() += '\x00';
+ F->getContents().append(Name.begin(), Name.end());
+ F->getContents().push_back('\x00');
}
}
-bool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm,
- const MCValue Target,
- bool IsPCRel,
- const MCFragment *DF) const {
- // If this is a PCrel relocation, find the section this fixup value is
- // relative to.
- const MCSection *BaseSection = 0;
- if (IsPCRel) {
- BaseSection = &DF->getParent()->getSection();
- assert(BaseSection);
- }
-
- const MCSection *SectionA = 0;
- const MCSymbol *SymbolA = 0;
- if (const MCSymbolRefExpr *A = Target.getSymA()) {
- SymbolA = &A->getSymbol();
- SectionA = &SymbolA->AliasedSymbol().getSection();
- }
-
- const MCSection *SectionB = 0;
- const MCSymbol *SymbolB = 0;
- if (const MCSymbolRefExpr *B = Target.getSymB()) {
- SymbolB = &B->getSymbol();
- SectionB = &SymbolB->AliasedSymbol().getSection();
+void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm,
+ MCAsmLayout &Layout,
+ GroupMapTy &GroupMap,
+ RevGroupMapTy &RevGroupMap,
+ SectionIndexMapTy &SectionIndexMap,
+ const RelMapTy &RelMap) {
+ // Create the .note.GNU-stack section if needed.
+ MCContext &Ctx = Asm.getContext();
+ if (Asm.getNoExecStack()) {
+ const MCSectionELF *GnuStackSection =
+ Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS, 0,
+ SectionKind::getReadOnly());
+ Asm.getOrCreateSectionData(*GnuStackSection);
}
- if (!BaseSection)
- return SectionA == SectionB;
-
- if (SymbolB)
- return false;
-
- // Absolute address but PCrel instruction, so we need a relocation.
- if (!SymbolA)
- return false;
-
- // FIXME: This is in here just to match gnu as output. If the two ends
- // are in the same section, there is nothing that the linker can do to
- // break it.
- const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA);
- if (DataA.isExternal())
- return false;
-
- return BaseSection == SectionA;
-}
-
-void ELFObjectWriter::CreateGroupSections(MCAssembler &Asm,
- MCAsmLayout &Layout,
- GroupMapTy &GroupMap,
- RevGroupMapTy &RevGroupMap) {
// Build the groups
for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end();
it != ie; ++it) {
const MCSectionELF &Section =
static_cast<const MCSectionELF&>(it->getSection());
- if (!(Section.getFlags() & MCSectionELF::SHF_GROUP))
+ if (!(Section.getFlags() & ELF::SHF_GROUP))
continue;
const MCSymbol *SignatureSymbol = Section.getGroup();
Asm.getOrCreateSymbolData(*SignatureSymbol);
const MCSectionELF *&Group = RevGroupMap[SignatureSymbol];
if (!Group) {
- Group = Asm.getContext().CreateELFGroupSection();
+ Group = Ctx.CreateELFGroupSection();
MCSectionData &Data = Asm.getOrCreateSectionData(*Group);
Data.setAlignment(4);
MCDataFragment *F = new MCDataFragment(&Data);
GroupMap[Group] = SignatureSymbol;
}
+ ComputeIndexMap(Asm, SectionIndexMap, RelMap);
+
// Add sections to the groups
- unsigned Index = 1;
- unsigned NumGroups = RevGroupMap.size();
for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end();
- it != ie; ++it, ++Index) {
+ it != ie; ++it) {
const MCSectionELF &Section =
static_cast<const MCSectionELF&>(it->getSection());
- if (!(Section.getFlags() & MCSectionELF::SHF_GROUP))
+ if (!(Section.getFlags() & ELF::SHF_GROUP))
continue;
const MCSectionELF *Group = RevGroupMap[Section.getGroup()];
MCSectionData &Data = Asm.getOrCreateSectionData(*Group);
// FIXME: we could use the previous fragment
MCDataFragment *F = new MCDataFragment(&Data);
- String32(*F, NumGroups + Index);
+ unsigned Index = SectionIndexMap.lookup(&Section);
+ String32(*F, Index);
}
}
case ELF::SHT_PROGBITS:
case ELF::SHT_STRTAB:
case ELF::SHT_NOBITS:
+ case ELF::SHT_NOTE:
case ELF::SHT_NULL:
case ELF::SHT_ARM_ATTRIBUTES:
+ case ELF::SHT_INIT_ARRAY:
+ case ELF::SHT_FINI_ARRAY:
+ case ELF::SHT_PREINIT_ARRAY:
+ case ELF::SHT_X86_64_UNWIND:
+ case ELF::SHT_MIPS_REGINFO:
+ case ELF::SHT_MIPS_OPTIONS:
// 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!");
break;
}
+ if (TargetObjectWriter->getEMachine() == ELF::EM_ARM &&
+ Section.getType() == ELF::SHT_ARM_EXIDX) {
+ StringRef SecName(Section.getSectionName());
+ if (SecName == ".ARM.exidx") {
+ sh_link = SectionIndexMap.lookup(
+ Asm.getContext().getELFSection(".text",
+ ELF::SHT_PROGBITS,
+ ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
+ SectionKind::getText()));
+ } else if (SecName.startswith(".ARM.exidx")) {
+ sh_link = SectionIndexMap.lookup(
+ Asm.getContext().getELFSection(SecName.substr(sizeof(".ARM.exidx") - 1),
+ ELF::SHT_PROGBITS,
+ ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
+ SectionKind::getText()));
+ }
+ }
+
WriteSecHdrEntry(SectionStringTableIndex[&Section], Section.getType(),
Section.getFlags(), 0, Offset, Size, sh_link, sh_info,
Alignment, Section.getEntrySize());
}
-static bool IsELFMetaDataSection(const MCSectionData &SD) {
+bool ELFObjectWriter::IsELFMetaDataSection(const MCSectionData &SD) {
return SD.getOrdinal() == ~UINT32_C(0) &&
!SD.getSection().isVirtualSection();
}
-static uint64_t DataSectionSize(const MCSectionData &SD) {
+uint64_t ELFObjectWriter::DataSectionSize(const MCSectionData &SD) {
uint64_t Ret = 0;
for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e;
++i) {
return Ret;
}
-static uint64_t GetSectionFileSize(const MCAsmLayout &Layout,
- const MCSectionData &SD) {
+uint64_t ELFObjectWriter::GetSectionFileSize(const MCAsmLayout &Layout,
+ const MCSectionData &SD) {
if (IsELFMetaDataSection(SD))
return DataSectionSize(SD);
return Layout.getSectionFileSize(&SD);
}
-static uint64_t GetSectionAddressSize(const MCAsmLayout &Layout,
- const MCSectionData &SD) {
+uint64_t ELFObjectWriter::GetSectionAddressSize(const MCAsmLayout &Layout,
+ const MCSectionData &SD) {
if (IsELFMetaDataSection(SD))
return DataSectionSize(SD);
return Layout.getSectionAddressSize(&SD);
}
-static void WriteDataSectionData(ELFObjectWriter *W, const MCSectionData &SD) {
- for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e;
- ++i) {
- const MCFragment &F = *i;
- assert(F.getKind() == MCFragment::FT_Data);
- W->WriteBytes(cast<MCDataFragment>(F).getContents().str());
- }
-}
+void ELFObjectWriter::WriteDataSectionData(MCAssembler &Asm,
+ const MCAsmLayout &Layout,
+ const MCSectionELF &Section) {
+ const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
-void ELFObjectWriter::WriteObject(MCAssembler &Asm,
- const MCAsmLayout &Layout) {
- GroupMapTy GroupMap;
- RevGroupMapTy RevGroupMap;
- CreateGroupSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap,
- RevGroupMap);
-
- SectionIndexMapTy SectionIndexMap;
-
- ComputeIndexMap(Asm, SectionIndexMap);
-
- // Compute symbol table information.
- ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap);
-
- CreateMetadataSections(const_cast<MCAssembler&>(Asm),
- const_cast<MCAsmLayout&>(Layout),
- SectionIndexMap);
+ uint64_t Padding = OffsetToAlignment(OS.tell(), SD.getAlignment());
+ WriteZeros(Padding);
- // Update to include the metadata sections.
- ComputeIndexMap(Asm, SectionIndexMap);
+ if (IsELFMetaDataSection(SD)) {
+ for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e;
+ ++i) {
+ const MCFragment &F = *i;
+ assert(F.getKind() == MCFragment::FT_Data);
+ WriteBytes(cast<MCDataFragment>(F).getContents());
+ }
+ } else {
+ Asm.writeSectionData(&SD, Layout);
+ }
+}
- // Add 1 for the null section.
- unsigned NumSections = Asm.size() + 1;
- uint64_t NaturalAlignment = Is64Bit ? 8 : 4;
- uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr);
- uint64_t FileOff = HeaderSize;
+void ELFObjectWriter::WriteSectionHeader(MCAssembler &Asm,
+ const GroupMapTy &GroupMap,
+ const MCAsmLayout &Layout,
+ const SectionIndexMapTy &SectionIndexMap,
+ const SectionOffsetMapTy &SectionOffsetMap) {
+ const unsigned NumSections = Asm.size() + 1;
std::vector<const MCSectionELF*> Sections;
- Sections.resize(NumSections);
+ Sections.resize(NumSections - 1);
for (SectionIndexMapTy::const_iterator i=
SectionIndexMap.begin(), e = SectionIndexMap.end(); i != e; ++i) {
const std::pair<const MCSectionELF*, uint32_t> &p = *i;
- Sections[p.second] = p.first;
- }
-
- for (unsigned i = 1; i < NumSections; ++i) {
- const MCSectionELF &Section = *Sections[i];
- const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
-
- FileOff = RoundUpToAlignment(FileOff, SD.getAlignment());
-
- // Get the size of the section in the output file (including padding).
- FileOff += GetSectionFileSize(Layout, SD);
- }
-
- FileOff = RoundUpToAlignment(FileOff, NaturalAlignment);
-
- // Write out the ELF header ...
- WriteHeader(FileOff - HeaderSize, NumSections);
-
- FileOff = HeaderSize;
-
- // ... then all of the sections ...
- DenseMap<const MCSection*, uint64_t> SectionOffsetMap;
-
- for (unsigned i = 1; i < NumSections; ++i) {
- const MCSectionELF &Section = *Sections[i];
- const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
-
- uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment());
- WriteZeros(Padding);
- FileOff += Padding;
-
- // Remember the offset into the file for this section.
- SectionOffsetMap[&Section] = FileOff;
-
- FileOff += GetSectionFileSize(Layout, SD);
-
- if (IsELFMetaDataSection(SD))
- WriteDataSectionData(this, SD);
- else
- Asm.WriteSectionData(&SD, Layout, this);
+ Sections[p.second - 1] = p.first;
}
- uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment);
- WriteZeros(Padding);
- FileOff += Padding;
-
- // ... and then the section header table.
- // Should we align the section header table?
- //
// Null section first.
uint64_t FirstSectionSize =
NumSections >= ELF::SHN_LORESERVE ? NumSections : 0;
ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0;
WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0);
- for (unsigned i = 1; i < NumSections; ++i) {
+ for (unsigned i = 0; i < NumSections - 1; ++i) {
const MCSectionELF &Section = *Sections[i];
const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
uint32_t GroupSymbolIndex;
if (Section.getType() != ELF::SHT_GROUP)
GroupSymbolIndex = 0;
else
- GroupSymbolIndex = getSymbolIndexInSymbolTable(Asm, GroupMap[&Section]);
+ GroupSymbolIndex = getSymbolIndexInSymbolTable(Asm,
+ GroupMap.lookup(&Section));
uint64_t Size = GetSectionAddressSize(Layout, SD);
WriteSection(Asm, SectionIndexMap, GroupSymbolIndex,
- SectionOffsetMap[&Section], Size,
+ SectionOffsetMap.lookup(&Section), Size,
SD.getAlignment(), Section);
}
}
-MCObjectWriter *llvm::createELFObjectWriter(raw_ostream &OS,
- bool Is64Bit,
- Triple::OSType OSType,
- uint16_t EMachine,
- bool IsLittleEndian,
- bool HasRelocationAddend) {
- switch (EMachine) {
- case ELF::EM_386:
- case ELF::EM_X86_64:
- return new X86ELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine,
- HasRelocationAddend, OSType); break;
- case ELF::EM_ARM:
- return new ARMELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine,
- HasRelocationAddend, OSType); break;
- case ELF::EM_MBLAZE:
- return new MBlazeELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine,
- HasRelocationAddend, OSType); break;
- default: llvm_unreachable("Unsupported architecture"); break;
+void ELFObjectWriter::ComputeSectionOrder(MCAssembler &Asm,
+ std::vector<const MCSectionELF*> &Sections) {
+ for (MCAssembler::iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it) {
+ const MCSectionELF &Section =
+ static_cast<const MCSectionELF &>(it->getSection());
+ if (Section.getType() == ELF::SHT_GROUP)
+ Sections.push_back(&Section);
+ }
+
+ for (MCAssembler::iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it) {
+ const MCSectionELF &Section =
+ static_cast<const MCSectionELF &>(it->getSection());
+ if (Section.getType() != ELF::SHT_GROUP &&
+ Section.getType() != ELF::SHT_REL &&
+ Section.getType() != ELF::SHT_RELA)
+ Sections.push_back(&Section);
+ }
+
+ for (MCAssembler::iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it) {
+ const MCSectionELF &Section =
+ static_cast<const MCSectionELF &>(it->getSection());
+ if (Section.getType() == ELF::SHT_REL ||
+ Section.getType() == ELF::SHT_RELA)
+ Sections.push_back(&Section);
}
}
+void ELFObjectWriter::WriteObject(MCAssembler &Asm,
+ const MCAsmLayout &Layout) {
+ GroupMapTy GroupMap;
+ RevGroupMapTy RevGroupMap;
+ SectionIndexMapTy SectionIndexMap;
-/// START OF SUBCLASSES for ELFObjectWriter
-//===- ARMELFObjectWriter -------------------------------------------===//
+ unsigned NumUserSections = Asm.size();
-ARMELFObjectWriter::ARMELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
- bool _IsLittleEndian,
- uint16_t _EMachine, bool _HasRelocationAddend,
- Triple::OSType _OSType)
- : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
- _HasRelocationAddend, _OSType)
-{}
+ DenseMap<const MCSectionELF*, const MCSectionELF*> RelMap;
+ CreateRelocationSections(Asm, const_cast<MCAsmLayout&>(Layout), RelMap);
-ARMELFObjectWriter::~ARMELFObjectWriter()
-{}
+ const unsigned NumUserAndRelocSections = Asm.size();
+ CreateIndexedSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap,
+ RevGroupMap, SectionIndexMap, RelMap);
+ const unsigned AllSections = Asm.size();
+ const unsigned NumIndexedSections = AllSections - NumUserAndRelocSections;
-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 NumRegularSections = NumUserSections + NumIndexedSections;
- 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_BASE_PREL; break;
- case MCSymbolRefExpr::VK_ARM_TLSGD:
- assert(0 && "unimplemented"); break;
- case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
- Type = ELF::R_ARM_TLS_IE32;
- } break;
- case ARM::fixup_arm_branch:
- switch (Modifier) {
- case MCSymbolRefExpr::VK_ARM_PLT:
- Type = ELF::R_ARM_PLT32; break;
- default:
- Type = ELF::R_ARM_CALL; 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_branch:
- // FIXME: Differentiate between R_ARM_CALL and
- // R_ARM_JUMP24 (latter used for conditional jumps)
- Type = ELF::R_ARM_CALL; 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;
- }
- }
+ // Compute symbol table information.
+ ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap, NumRegularSections);
- if (RelocNeedsGOT(Modifier))
- NeedsGOT = true;
-
- return Type;
-}
-//===- MBlazeELFObjectWriter -------------------------------------------===//
+ WriteRelocations(Asm, const_cast<MCAsmLayout&>(Layout), RelMap);
-MBlazeELFObjectWriter::MBlazeELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
- bool _IsLittleEndian,
- uint16_t _EMachine,
- bool _HasRelocationAddend,
- Triple::OSType _OSType)
- : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
- _HasRelocationAddend, _OSType) {
-}
+ CreateMetadataSections(const_cast<MCAssembler&>(Asm),
+ const_cast<MCAsmLayout&>(Layout),
+ SectionIndexMap,
+ RelMap);
-MBlazeELFObjectWriter::~MBlazeELFObjectWriter() {
-}
+ uint64_t NaturalAlignment = is64Bit() ? 8 : 4;
+ uint64_t HeaderSize = is64Bit() ? sizeof(ELF::Elf64_Ehdr) :
+ sizeof(ELF::Elf32_Ehdr);
+ uint64_t FileOff = HeaderSize;
-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;
- }
+ std::vector<const MCSectionELF*> Sections;
+ ComputeSectionOrder(Asm, Sections);
+ unsigned NumSections = Sections.size();
+ SectionOffsetMapTy SectionOffsetMap;
+ for (unsigned i = 0; i < NumRegularSections + 1; ++i) {
+ const MCSectionELF &Section = *Sections[i];
+ const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
+
+ FileOff = RoundUpToAlignment(FileOff, SD.getAlignment());
+
+ // Remember the offset into the file for this section.
+ SectionOffsetMap[&Section] = FileOff;
+
+ // Get the size of the section in the output file (including padding).
+ FileOff += GetSectionFileSize(Layout, SD);
}
- return Type;
-}
-//===- X86ELFObjectWriter -------------------------------------------===//
+ FileOff = RoundUpToAlignment(FileOff, NaturalAlignment);
+ const unsigned SectionHeaderOffset = FileOff - HeaderSize;
-X86ELFObjectWriter::X86ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
- bool _IsLittleEndian,
- uint16_t _EMachine, bool _HasRelocationAddend,
- Triple::OSType _OSType)
- : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
- _HasRelocationAddend, _OSType)
-{}
+ uint64_t SectionHeaderEntrySize = is64Bit() ?
+ sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr);
+ FileOff += (NumSections + 1) * SectionHeaderEntrySize;
-X86ELFObjectWriter::~X86ELFObjectWriter()
-{}
+ for (unsigned i = NumRegularSections + 1; i < NumSections; ++i) {
+ const MCSectionELF &Section = *Sections[i];
+ const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
-unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
- const MCFixup &Fixup,
- bool IsPCRel,
- bool IsRelocWithSymbol,
- int64_t Addend) {
- // determine the type of the relocation
+ FileOff = RoundUpToAlignment(FileOff, SD.getAlignment());
- MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
- MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
- unsigned Type;
- if (Is64Bit) {
- if (IsPCRel) {
- 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;
- }
- } 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:
- case FK_PCRel_4:
- assert(isInt<32>(Target.getConstant()));
- 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;
- }
- 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;
- }
- }
+ // Remember the offset into the file for this section.
+ SectionOffsetMap[&Section] = FileOff;
+
+ // Get the size of the section in the output file (including padding).
+ FileOff += GetSectionFileSize(Layout, SD);
}
- if (RelocNeedsGOT(Modifier))
- NeedsGOT = true;
+ // Write out the ELF header ...
+ WriteHeader(Asm, SectionHeaderOffset, NumSections + 1);
+
+ // ... then the regular sections ...
+ // + because of .shstrtab
+ for (unsigned i = 0; i < NumRegularSections + 1; ++i)
+ WriteDataSectionData(Asm, Layout, *Sections[i]);
+
+ uint64_t Padding = OffsetToAlignment(OS.tell(), NaturalAlignment);
+ WriteZeros(Padding);
+
+ // ... then the section header table ...
+ WriteSectionHeader(Asm, GroupMap, Layout, SectionIndexMap,
+ SectionOffsetMap);
+
+ // ... and then the remaining sections ...
+ for (unsigned i = NumRegularSections + 1; i < NumSections; ++i)
+ WriteDataSectionData(Asm, Layout, *Sections[i]);
+}
+
+bool
+ELFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
+ const MCSymbolData &DataA,
+ const MCFragment &FB,
+ bool InSet,
+ bool IsPCRel) const {
+ if (DataA.getFlags() & ELF_STB_Weak)
+ return false;
+ return MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(
+ Asm, DataA, FB,InSet, IsPCRel);
+}
- return Type;
+MCObjectWriter *llvm::createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &OS,
+ bool IsLittleEndian) {
+ return new ELFObjectWriter(MOTW, OS, IsLittleEndian);
}
projects / oota-llvm.git / blobdiff