//
//===----------------------------------------------------------------------===//
+#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFSymbolFlags.h"
#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSymbol.h"
}
}
+static bool isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind) {
+ const MCFixupKindInfo &FKI =
+ Asm.getBackend().getFixupKindInfo((MCFixupKind) Kind);
+
+ return FKI.Flags & MCFixupKindInfo::FKF_IsPCRel;
+}
+
namespace {
class ELFObjectWriter : public MCObjectWriter {
protected:
}
};
+ /// 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;
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 MCValue &Target,
const MCFragment &F) const;
+ bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
+ bool hasRelocationAddend() const {
+ return TargetObjectWriter->hasRelocationAddend();
+ }
+
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);
uint64_t Size, uint32_t Link, uint32_t Info,
uint64_t Alignment, uint64_t EntrySize);
- virtual void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F,
- const MCSectionData *SD);
+ virtual void WriteRelocationsFragment(const MCAssembler &Asm,
+ MCDataFragment *F,
+ const MCSectionData *SD);
virtual bool IsFixupFullyResolved(const MCAssembler &Asm,
const MCValue Target,
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);
+ X86ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS,
+ bool IsLittleEndian);
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;
- }
- }
};
class ARMELFObjectWriter : public ELFObjectWriter {
public:
- ARMELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
- uint16_t _EMachine, bool _HasRelAddend,
- Triple::OSType _OSType);
+ ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS,
+ bool IsLittleEndian);
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 -------------------------------------------===//
class MBlazeELFObjectWriter : public ELFObjectWriter {
public:
- MBlazeELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian,
- uint16_t _EMachine, bool _HasRelAddend,
- Triple::OSType _OSType);
+ MBlazeELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS,
+ bool IsLittleEndian);
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;
- }
- }
};
}
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) {
+ 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;
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_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)
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
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;
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
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();
}
Addend = Value;
// Compensate for the addend on i386.
- if (Is64Bit)
+ if (is64Bit())
Value = 0;
}
uint64_t RelocOffset = Layout.getFragmentOffset(Fragment) +
Fixup.getOffset();
- if (!HasRelocationAddend) Addend = 0;
+ if (!hasRelocationAddend())
+ Addend = 0;
ELFRelocationEntry ERE(RelocOffset, Index, Type, RelocSymbol, Addend);
Relocations[Fragment->getParent()].push_back(ERE);
}
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);
- RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ?
+ RelaSection = Ctx.getELFSection(RelaSectionName, hasRelocationAddend() ?
ELF::SHT_RELA : ELF::SHT_REL, 0,
SectionKind::getReadOnly(),
EntrySize, "");
MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection);
- RelaSD.setAlignment(Is64Bit ? 8 : 4);
+ RelaSD.setAlignment(is64Bit() ? 8 : 4);
MCDataFragment *F = new MCDataFragment(&RelaSD);
entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol);
else
entry.Index += LocalSymbolData.size();
- if (Is64Bit) {
+ if (is64Bit()) {
String64(*F, entry.r_offset);
struct ELF::Elf64_Rela ERE64;
ERE64.setSymbolAndType(entry.Index, entry.Type);
String64(*F, ERE64.r_info);
- if (HasRelocationAddend)
+ 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);
}
}
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(),
EntrySize, "");
MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection);
- SymtabSD.setAlignment(Is64Bit ? 8 : 4);
+ SymtabSD.setAlignment(is64Bit() ? 8 : 4);
SymbolTableIndex = Asm.size();
MCSectionData *SymtabShndxSD = NULL;
// 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 NaturalAlignment = is64Bit() ? 8 : 4;
+ uint64_t HeaderSize = is64Bit() ? sizeof(ELF::Elf64_Ehdr) :
+ sizeof(ELF::Elf32_Ehdr);
uint64_t FileOff = HeaderSize;
std::vector<const MCSectionELF*> Sections;
if (IsELFMetaDataSection(SD))
WriteDataSectionData(this, SD);
else
- Asm.WriteSectionData(&SD, Layout, this);
+ Asm.WriteSectionData(&SD, Layout);
}
uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment);
}
}
-MCObjectWriter *llvm::createELFObjectWriter(raw_ostream &OS,
- bool Is64Bit,
- Triple::OSType OSType,
- uint16_t EMachine,
- bool IsLittleEndian,
- bool HasRelocationAddend) {
- switch (EMachine) {
+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(OS, Is64Bit, IsLittleEndian, EMachine,
- HasRelocationAddend, OSType); break;
+ return new X86ELFObjectWriter(MOTW, OS, IsLittleEndian); break;
case ELF::EM_ARM:
- return new ARMELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine,
- HasRelocationAddend, OSType); break;
+ return new ARMELFObjectWriter(MOTW, OS, IsLittleEndian); break;
case ELF::EM_MBLAZE:
- return new MBlazeELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine,
- HasRelocationAddend, OSType); break;
+ return new MBlazeELFObjectWriter(MOTW, OS, IsLittleEndian); break;
default: llvm_unreachable("Unsupported architecture"); break;
}
}
/// START OF SUBCLASSES for ELFObjectWriter
//===- ARMELFObjectWriter -------------------------------------------===//
-ARMELFObjectWriter::ARMELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
- bool _IsLittleEndian,
- uint16_t _EMachine, bool _HasRelocationAddend,
- Triple::OSType _OSType)
- : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
- _HasRelocationAddend, _OSType)
+ARMELFObjectWriter::ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS,
+ bool IsLittleEndian)
+ : ELFObjectWriter(MOTW, _OS, IsLittleEndian)
{}
ARMELFObjectWriter::~ARMELFObjectWriter()
unsigned Type = 0;
if (IsPCRel) {
- switch (Modifier) {
- default: assert(0 && "Unimplemented Modifier");
- case MCSymbolRefExpr::VK_None: break;
- }
switch ((unsigned)Fixup.getKind()) {
default: assert(0 && "Unimplemented");
- case ARM::fixup_arm_branch: Type = ELF::R_ARM_CALL; break;
+ 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");
+ 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;
+ 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_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;
//===- MBlazeELFObjectWriter -------------------------------------------===//
-MBlazeELFObjectWriter::MBlazeELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
- bool _IsLittleEndian,
- uint16_t _EMachine,
- bool _HasRelocationAddend,
- Triple::OSType _OSType)
- : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
- _HasRelocationAddend, _OSType) {
+MBlazeELFObjectWriter::MBlazeELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS,
+ bool IsLittleEndian)
+ : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {
}
MBlazeELFObjectWriter::~MBlazeELFObjectWriter() {
//===- X86ELFObjectWriter -------------------------------------------===//
-X86ELFObjectWriter::X86ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
- bool _IsLittleEndian,
- uint16_t _EMachine, bool _HasRelocationAddend,
- Triple::OSType _OSType)
- : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
- _HasRelocationAddend, _OSType)
+X86ELFObjectWriter::X86ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS,
+ bool IsLittleEndian)
+ : ELFObjectWriter(MOTW, _OS, IsLittleEndian)
{}
X86ELFObjectWriter::~X86ELFObjectWriter()
MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
unsigned Type;
- if (Is64Bit) {
+ if (is64Bit()) {
if (IsPCRel) {
switch (Modifier) {
default:
projects / oota-llvm.git / blobdiff