//
//===----------------------------------------------------------------------===//
+#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"
#include "llvm/Target/TargetAsmBackend.h"
#include "../Target/X86/X86FixupKinds.h"
+#include "../Target/ARM/ARMFixupKinds.h"
#include <vector>
using namespace llvm;
return Visibility;
}
-static bool isFixupKindX86PCRel(unsigned Kind) {
- switch (Kind) {
- default:
- return false;
- case X86::reloc_pcrel_1byte:
- case X86::reloc_pcrel_4byte:
- case X86::reloc_riprel_4byte:
- case X86::reloc_riprel_4byte_movq_load:
- return true;
- }
-}
static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) {
switch (Variant) {
}
}
+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:
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;
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);
const SectionIndexMapTy &SectionIndexMap);
virtual void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
- const MCFragment *Fragment, const MCFixup &Fixup,
- MCValue Target, uint64_t &FixedValue) {
- assert(0 && "RecordRelocation is not specific enough");
- };
+ const MCFragment *Fragment, const MCFixup &Fixup,
+ MCValue Target, uint64_t &FixedValue);
virtual uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm,
const MCSymbol *S);
virtual void CreateGroupSections(MCAssembler &Asm, MCAsmLayout &Layout,
GroupMapTy &GroupMap, RevGroupMapTy &RevGroupMap);
- virtual void ExecutePostLayoutBinding(MCAssembler &Asm);
+ virtual void ExecutePostLayoutBinding(MCAssembler &Asm,
+ const MCAsmLayout &Layout);
virtual 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,
- const MCSectionData *SD);
+ virtual void WriteRelocationsFragment(const MCAssembler &Asm,
+ MCDataFragment *F,
+ const MCSectionData *SD);
virtual bool IsFixupFullyResolved(const MCAssembler &Asm,
const MCValue Target,
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;
};
//===- 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();
- virtual void RecordRelocation(const MCAssembler &Asm,
- const MCAsmLayout &Layout,
- const MCFragment *Fragment,
- const MCFixup &Fixup, MCValue Target,
- uint64_t &FixedValue);
+ protected:
+ virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
+ bool IsPCRel, bool IsRelocWithSymbol,
+ int64_t Addend);
};
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();
- virtual void RecordRelocation(const MCAssembler &Asm,
- const MCAsmLayout &Layout,
- const MCFragment *Fragment,
- const MCFixup &Fixup, MCValue Target,
- uint64_t &FixedValue);
+ protected:
+ virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
+ bool IsPCRel, bool IsRelocWithSymbol,
+ int64_t Addend);
+ };
+
+ //===- MBlazeELFObjectWriter -------------------------------------------===//
+
+ class MBlazeELFObjectWriter : public ELFObjectWriter {
+ public:
+ 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);
};
}
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;
- if (MCFragment *FF = Data.getFragment())
- return Layout.getSymbolAddress(&Data) -
- Layout.getSectionAddress(FF->getParent());
+ if (Data.getFragment())
+ return Layout.getSymbolOffset(&Data);
return 0;
}
-static const MCSymbol &AliasedSymbol(const MCSymbol &Symbol) {
- const MCSymbol *S = &Symbol;
- while (S->isVariable()) {
- const MCExpr *Value = S->getVariableValue();
- MCExpr::ExprKind Kind = Value->getKind();
- switch (Kind) {
- case MCExpr::SymbolRef: {
- const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value);
- S = &Ref->getSymbol();
- break;
- }
- case MCExpr::Target: {
- const MCTargetExpr *TExp = static_cast<const MCTargetExpr*>(Value);
- MCValue Res;
- TExp->EvaluateAsRelocatableImpl(Res, NULL);
- S = &Res.getSymA()->getSymbol();
- break;
- }
- default:
- return *S;
- }
- }
- return *S;
-}
-
-void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) {
+void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
+ const MCAsmLayout &Layout) {
// The presence of symbol versions causes undefined symbols and
// versions declared with @@@ to be renamed.
for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
ie = Asm.symbol_end(); it != ie; ++it) {
const MCSymbol &Alias = it->getSymbol();
- const MCSymbol &Symbol = AliasedSymbol(Alias);
+ const MCSymbol &Symbol = Alias.AliasedSymbol();
MCSymbolData &SD = Asm.getSymbolData(Symbol);
// Not an alias.
const MCAsmLayout &Layout) {
MCSymbolData &OrigData = *MSD.SymbolData;
MCSymbolData &Data =
- Layout.getAssembler().getSymbolData(AliasedSymbol(OrigData.getSymbol()));
+ Layout.getAssembler().getSymbolData(OrigData.getSymbol().AliasedSymbol());
bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() ||
Data.getSymbol().isVariable();
const MCValue &Target,
const MCFragment &F) const {
const MCSymbol &Symbol = Target.getSymA()->getSymbol();
- const MCSymbol &ASymbol = AliasedSymbol(Symbol);
- const MCSymbol *RenamedP = Renames.lookup(&Symbol);
-
- if (!RenamedP) {
- if (Target.getSymA()->getKind() == MCSymbolRefExpr::VK_None ||
- Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref)
- RenamedP = &ASymbol;
- else
- RenamedP = &Symbol;
+ const MCSymbol &ASymbol = Symbol.AliasedSymbol();
+ const MCSymbol *Renamed = Renames.lookup(&Symbol);
+ const MCSymbolData &SD = Asm.getSymbolData(Symbol);
+
+ if (ASymbol.isUndefined()) {
+ if (Renamed)
+ return Renamed;
+ return &ASymbol;
}
- const MCSymbol &Renamed = *RenamedP;
-
- MCSymbolData &SD = Asm.getSymbolData(Symbol);
- if (Symbol.isUndefined())
- return &Renamed;
-
- if (SD.isExternal())
- return &Renamed;
+ if (SD.isExternal()) {
+ if (Renamed)
+ return Renamed;
+ return &Symbol;
+ }
const MCSectionELF &Section =
- static_cast<const MCSectionELF&>(Symbol.getSection());
+ static_cast<const MCSectionELF&>(ASymbol.getSection());
+ const SectionKind secKind = Section.getKind();
- if (Section.getKind().isBSS())
+ if (secKind.isBSS())
return NULL;
+ if (secKind.isThreadLocal()) {
+ if (Renamed)
+ return Renamed;
+ return &Symbol;
+ }
+
MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind();
const MCSectionELF &Sec2 =
static_cast<const MCSectionELF&>(F.getParent()->getSection());
if (&Sec2 != &Section &&
(Kind == MCSymbolRefExpr::VK_PLT ||
Kind == MCSymbolRefExpr::VK_GOTPCREL ||
- Kind == MCSymbolRefExpr::VK_GOTOFF))
- return &Renamed;
+ Kind == MCSymbolRefExpr::VK_GOTOFF)) {
+ if (Renamed)
+ return Renamed;
+ return &Symbol;
+ }
if (Section.getFlags() & MCSectionELF::SHF_MERGE) {
- if (Target.getConstant() != 0)
- return &Renamed;
- return NULL;
+ if (Target.getConstant() == 0)
+ return NULL;
+ if (Renamed)
+ return Renamed;
+ return &Symbol;
}
return NULL;
}
+void ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
+ const MCAsmLayout &Layout,
+ const MCFragment *Fragment,
+ const MCFixup &Fixup,
+ MCValue Target,
+ uint64_t &FixedValue) {
+ int64_t Addend = 0;
+ int Index = 0;
+ int64_t Value = Target.getConstant();
+ const MCSymbol *RelocSymbol = NULL;
+
+ 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);
+
+ if (const MCSymbolRefExpr *RefB = Target.getSymB()) {
+ const MCSymbol &SymbolB = RefB->getSymbol();
+ MCSymbolData &SDB = Asm.getSymbolData(SymbolB);
+ IsPCRel = true;
+
+ // Offset of the symbol in the section
+ int64_t a = Layout.getSymbolOffset(&SDB);
+
+ // Ofeset of the relocation in the section
+ int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
+ Value += b - a;
+ }
+
+ if (!RelocSymbol) {
+ 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);
+ } else {
+ if (Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref)
+ WeakrefUsedInReloc.insert(RelocSymbol);
+ else
+ UsedInReloc.insert(RelocSymbol);
+ Index = -1;
+ }
+ Addend = Value;
+ // Compensate for the addend on i386.
+ if (is64Bit())
+ Value = 0;
+ }
+
+ FixedValue = Value;
+ unsigned Type = GetRelocType(Target, Fixup, IsPCRel,
+ (RelocSymbol != 0), Addend);
+
+ uint64_t RelocOffset = Layout.getFragmentOffset(Fragment) +
+ Fixup.getOffset();
+
+ if (!hasRelocationAddend())
+ Addend = 0;
+ ELFRelocationEntry ERE(RelocOffset, Index, Type, RelocSymbol, Addend);
+ Relocations[Fragment->getParent()].push_back(ERE);
+}
+
+
uint64_t
ELFObjectWriter::getSymbolIndexInSymbolTable(const MCAssembler &Asm,
const MCSymbol *S) {
if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_")
return true;
- const MCSymbol &A = AliasedSymbol(Symbol);
+ const MCSymbol &A = Symbol.AliasedSymbol();
if (!A.isVariable() && A.isUndefined() && !Data.isCommon())
return false;
return false;
const MCSymbol &Symbol = Data.getSymbol();
- const MCSymbol &RefSymbol = AliasedSymbol(Symbol);
+ const MCSymbol &RefSymbol = Symbol.AliasedSymbol();
if (RefSymbol.isUndefined() && !RefSymbol.isVariable()) {
if (isSignature && !isUsedInReloc)
ELFSymbolData MSD;
MSD.SymbolData = it;
- const MCSymbol &RefSymbol = AliasedSymbol(Symbol);
+ const MCSymbol &RefSymbol = Symbol.AliasedSymbol();
// Undefined symbols are global, but this is the first place we
// are able to set it.
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);
WriteRelocationsFragment(Asm, F, &SD);
-
- Asm.AddSectionToTheEnd(*this, RelaSD, Layout);
}
}
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
ELFRelocationEntry entry = Relocs[e - i - 1];
- if (entry.Index < 0)
+ if (!entry.Index)
+ ;
+ else if (entry.Index < 0)
entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol);
else
- entry.Index += LocalSymbolData.size() + 1;
- if (Is64Bit) {
+ entry.Index += LocalSymbolData.size();
+ 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;
MCDataFragment *ShndxF = NULL;
if (NeedsSymtabShndx) {
ShndxF = new MCDataFragment(SymtabShndxSD);
- Asm.AddSectionToTheEnd(*this, *SymtabShndxSD, Layout);
}
WriteSymbolTable(F, ShndxF, Asm, Layout, SectionIndexMap);
- Asm.AddSectionToTheEnd(*this, SymtabSD, Layout);
F = new MCDataFragment(&StrtabSD);
F->getContents().append(StringTable.begin(), StringTable.end());
- Asm.AddSectionToTheEnd(*this, StrtabSD, Layout);
F = new MCDataFragment(&ShstrtabSD);
F->getContents() += Name;
F->getContents() += '\x00';
}
-
- Asm.AddSectionToTheEnd(*this, ShstrtabSD, Layout);
}
bool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm,
const MCSymbol *SymbolA = 0;
if (const MCSymbolRefExpr *A = Target.getSymA()) {
SymbolA = &A->getSymbol();
- SectionA = &SymbolA->getSection();
+ SectionA = &SymbolA->AliasedSymbol().getSection();
}
const MCSection *SectionB = 0;
+ const MCSymbol *SymbolB = 0;
if (const MCSymbolRefExpr *B = Target.getSymB()) {
- SectionB = &B->getSymbol().getSection();
+ SymbolB = &B->getSymbol();
+ SectionB = &SymbolB->AliasedSymbol().getSection();
}
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 !SectionB && BaseSection == SectionA;
+ return BaseSection == SectionA;
}
void ELFObjectWriter::CreateGroupSections(MCAssembler &Asm,
MCDataFragment *F = new MCDataFragment(&Data);
String32(*F, NumGroups + Index);
}
-
- for (RevGroupMapTy::const_iterator i = RevGroupMap.begin(),
- e = RevGroupMap.end(); i != e; ++i) {
- const MCSectionELF *Group = i->second;
- MCSectionData &Data = Asm.getOrCreateSectionData(*Group);
- Asm.AddSectionToTheEnd(*this, Data, Layout);
- }
}
void ELFObjectWriter::WriteSection(MCAssembler &Asm,
Alignment, Section.getEntrySize());
}
+static bool IsELFMetaDataSection(const MCSectionData &SD) {
+ return SD.getOrdinal() == ~UINT32_C(0) &&
+ !SD.getSection().isVirtualSection();
+}
+
+static uint64_t DataSectionSize(const MCSectionData &SD) {
+ uint64_t Ret = 0;
+ for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e;
+ ++i) {
+ const MCFragment &F = *i;
+ assert(F.getKind() == MCFragment::FT_Data);
+ Ret += cast<MCDataFragment>(F).getContents().size();
+ }
+ return Ret;
+}
+
+static uint64_t 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) {
+ 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::WriteObject(MCAssembler &Asm,
const MCAsmLayout &Layout) {
GroupMapTy GroupMap;
// 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;
FileOff = RoundUpToAlignment(FileOff, SD.getAlignment());
// Get the size of the section in the output file (including padding).
- uint64_t Size = Layout.getSectionFileSize(&SD);
-
- FileOff += Size;
+ FileOff += GetSectionFileSize(Layout, SD);
}
FileOff = RoundUpToAlignment(FileOff, NaturalAlignment);
// Remember the offset into the file for this section.
SectionOffsetMap[&Section] = FileOff;
- FileOff += Layout.getSectionFileSize(&SD);
+ FileOff += GetSectionFileSize(Layout, SD);
- Asm.WriteSectionData(&SD, Layout, this);
+ if (IsELFMetaDataSection(SD))
+ WriteDataSectionData(this, SD);
+ else
+ Asm.WriteSectionData(&SD, Layout);
}
uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment);
else
GroupSymbolIndex = getSymbolIndexInSymbolTable(Asm, GroupMap[&Section]);
+ uint64_t Size = GetSectionAddressSize(Layout, SD);
+
WriteSection(Asm, SectionIndexMap, GroupSymbolIndex,
- SectionOffsetMap[&Section], Layout.getSectionSize(&SD),
+ SectionOffsetMap[&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) {
+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;
- default: assert(0 && "Unsupported architecture"); break;
+ return new ARMELFObjectWriter(MOTW, OS, IsLittleEndian); break;
+ case ELF::EM_MBLAZE:
+ 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()
{}
-void ARMELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
- const MCAsmLayout &Layout,
- const MCFragment *Fragment,
+unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
const MCFixup &Fixup,
- MCValue Target,
- uint64_t &FixedValue) {
- assert(0 && "ARMELFObjectWriter::RecordRelocation() unimplemented");
-}
-
-
-
-//===- X86ELFObjectWriter -------------------------------------------===//
-
+ bool IsPCRel,
+ bool IsRelocWithSymbol,
+ int64_t Addend) {
+ MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
+ MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
-X86ELFObjectWriter::X86ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit,
- bool _IsLittleEndian,
- uint16_t _EMachine, bool _HasRelocationAddend,
- Triple::OSType _OSType)
- : ELFObjectWriter(_OS, _Is64Bit, _IsLittleEndian, _EMachine,
- _HasRelocationAddend, _OSType)
-{}
+ 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;
+ }
+ }
-X86ELFObjectWriter::~X86ELFObjectWriter()
-{}
+ if (RelocNeedsGOT(Modifier))
+ NeedsGOT = true;
+
+ return Type;
+}
-void X86ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
- const MCAsmLayout &Layout,
- const MCFragment *Fragment,
- const MCFixup &Fixup,
- MCValue Target,
- uint64_t &FixedValue) {
- int64_t Addend = 0;
- int Index = 0;
- int64_t Value = Target.getConstant();
- const MCSymbol &Symbol = Target.getSymA()->getSymbol();
- const MCSymbol *RelocSymbol = SymbolToReloc(Asm, Target, *Fragment);
+//===- MBlazeELFObjectWriter -------------------------------------------===//
- bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind());
- if (!Target.isAbsolute()) {
- if (const MCSymbolRefExpr *RefB = Target.getSymB()) {
- const MCSymbol &SymbolB = RefB->getSymbol();
- MCSymbolData &SDB = Asm.getSymbolData(SymbolB);
- IsPCRel = true;
- MCSectionData *Sec = Fragment->getParent();
+MBlazeELFObjectWriter::MBlazeELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS,
+ bool IsLittleEndian)
+ : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {
+}
- // Offset of the symbol in the section
- int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec);
+MBlazeELFObjectWriter::~MBlazeELFObjectWriter() {
+}
- // Ofeset of the relocation in the section
- int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
- Value += b - a;
+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;
+}
- if (!RelocSymbol) {
- MCSymbolData &SD = Asm.getSymbolData(Symbol);
- MCFragment *F = SD.getFragment();
+//===- X86ELFObjectWriter -------------------------------------------===//
- Index = F->getParent()->getOrdinal();
- MCSectionData *FSD = F->getParent();
- // Offset of the symbol in the section
- Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD);
- } else {
- if (Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref)
- WeakrefUsedInReloc.insert(RelocSymbol);
- else
- UsedInReloc.insert(RelocSymbol);
- Index = -1;
- }
- Addend = Value;
- // Compensate for the addend on i386.
- if (Is64Bit)
- Value = 0;
- }
+X86ELFObjectWriter::X86ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+ raw_ostream &_OS,
+ bool IsLittleEndian)
+ : ELFObjectWriter(MOTW, _OS, IsLittleEndian)
+{}
- FixedValue = Value;
+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.getSymA()->getKind();
+ MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
+ MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
unsigned Type;
- if (Is64Bit) {
+ if (is64Bit()) {
if (IsPCRel) {
switch (Modifier) {
default:
default: llvm_unreachable("invalid fixup kind!");
case FK_Data_8: Type = ELF::R_X86_64_64; break;
case X86::reloc_signed_4byte:
- case X86::reloc_pcrel_4byte:
+ case FK_PCRel_4:
assert(isInt<32>(Target.getConstant()));
switch (Modifier) {
default:
Type = ELF::R_X86_64_32;
break;
case FK_Data_2: Type = ELF::R_X86_64_16; break;
- case X86::reloc_pcrel_1byte:
+ case FK_PCRel_1:
case FK_Data_1: Type = ELF::R_X86_64_8; break;
}
}
// FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
// instead?
case X86::reloc_signed_4byte:
- case X86::reloc_pcrel_4byte:
+ case FK_PCRel_4:
case FK_Data_4:
switch (Modifier) {
default:
}
break;
case FK_Data_2: Type = ELF::R_386_16; break;
- case X86::reloc_pcrel_1byte:
+ case FK_PCRel_1:
case FK_Data_1: Type = ELF::R_386_8; break;
}
}
if (RelocNeedsGOT(Modifier))
NeedsGOT = true;
- ELFRelocationEntry ERE;
-
- ERE.Index = Index;
- ERE.Type = Type;
- ERE.Symbol = RelocSymbol;
-
- ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
-
- if (HasRelocationAddend)
- ERE.r_addend = Addend;
- else
- ERE.r_addend = 0; // Silence compiler warning.
-
- Relocations[Fragment->getParent()].push_back(ERE);
+ return Type;
}
projects / oota-llvm.git / blobdiff