mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-12 15:05:06 +00:00
a00a62acd0
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145911 91177308-0d34-0410-b5e6-96231b3b80d8
461 lines
17 KiB
C++
461 lines
17 KiB
C++
//===- lib/MC/ELFObjectWriter.h - ELF File Writer -------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements ELF object file writer information.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_MC_ELFOBJECTWRITER_H
|
|
#define LLVM_MC_ELFOBJECTWRITER_H
|
|
|
|
#include "MCELF.h"
|
|
#include "llvm/ADT/OwningPtr.h"
|
|
#include "llvm/ADT/SmallPtrSet.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/MC/MCAssembler.h"
|
|
#include "llvm/MC/MCELFObjectWriter.h"
|
|
#include "llvm/MC/MCELFSymbolFlags.h"
|
|
#include "llvm/MC/MCObjectWriter.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
|
|
#include <vector>
|
|
|
|
namespace llvm {
|
|
|
|
class MCSection;
|
|
class MCDataFragment;
|
|
class MCSectionELF;
|
|
|
|
class ELFObjectWriter : public MCObjectWriter {
|
|
protected:
|
|
|
|
static bool isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind);
|
|
static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant);
|
|
static uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout);
|
|
static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data,
|
|
bool Used, bool Renamed);
|
|
static bool isLocal(const MCSymbolData &Data, bool isSignature,
|
|
bool isUsedInReloc);
|
|
static bool IsELFMetaDataSection(const MCSectionData &SD);
|
|
static uint64_t DataSectionSize(const MCSectionData &SD);
|
|
static uint64_t GetSectionFileSize(const MCAsmLayout &Layout,
|
|
const MCSectionData &SD);
|
|
static uint64_t GetSectionAddressSize(const MCAsmLayout &Layout,
|
|
const MCSectionData &SD);
|
|
|
|
void WriteDataSectionData(MCAssembler &Asm,
|
|
const MCAsmLayout &Layout,
|
|
const MCSectionELF &Section);
|
|
|
|
/*static bool isFixupKindX86RIPRel(unsigned Kind) {
|
|
return Kind == X86::reloc_riprel_4byte ||
|
|
Kind == X86::reloc_riprel_4byte_movq_load;
|
|
}*/
|
|
|
|
/// ELFSymbolData - Helper struct for containing some precomputed
|
|
/// information on symbols.
|
|
struct ELFSymbolData {
|
|
MCSymbolData *SymbolData;
|
|
uint64_t StringIndex;
|
|
uint32_t SectionIndex;
|
|
|
|
// Support lexicographic sorting.
|
|
bool operator<(const ELFSymbolData &RHS) const {
|
|
if (MCELF::GetType(*SymbolData) == ELF::STT_FILE)
|
|
return true;
|
|
if (MCELF::GetType(*RHS.SymbolData) == ELF::STT_FILE)
|
|
return false;
|
|
return SymbolData->getSymbol().getName() <
|
|
RHS.SymbolData->getSymbol().getName();
|
|
}
|
|
};
|
|
|
|
/// @name Relocation Data
|
|
/// @{
|
|
|
|
struct ELFRelocationEntry {
|
|
// Make these big enough for both 32-bit and 64-bit
|
|
uint64_t r_offset;
|
|
int Index;
|
|
unsigned Type;
|
|
const MCSymbol *Symbol;
|
|
uint64_t r_addend;
|
|
|
|
ELFRelocationEntry()
|
|
: r_offset(0), Index(0), Type(0), Symbol(0), r_addend(0) {}
|
|
|
|
ELFRelocationEntry(uint64_t RelocOffset, int Idx,
|
|
unsigned RelType, const MCSymbol *Sym,
|
|
uint64_t Addend)
|
|
: r_offset(RelocOffset), Index(Idx), Type(RelType),
|
|
Symbol(Sym), r_addend(Addend) {}
|
|
|
|
// Support lexicographic sorting.
|
|
bool operator<(const ELFRelocationEntry &RE) const {
|
|
return RE.r_offset < r_offset;
|
|
}
|
|
};
|
|
|
|
/// The target specific ELF writer instance.
|
|
llvm::OwningPtr<MCELFObjectTargetWriter> TargetObjectWriter;
|
|
|
|
SmallPtrSet<const MCSymbol *, 16> UsedInReloc;
|
|
SmallPtrSet<const MCSymbol *, 16> WeakrefUsedInReloc;
|
|
DenseMap<const MCSymbol *, const MCSymbol *> Renames;
|
|
|
|
llvm::DenseMap<const MCSectionData*,
|
|
std::vector<ELFRelocationEntry> > Relocations;
|
|
DenseMap<const MCSection*, uint64_t> SectionStringTableIndex;
|
|
|
|
/// @}
|
|
/// @name Symbol Table Data
|
|
/// @{
|
|
|
|
SmallString<256> StringTable;
|
|
std::vector<ELFSymbolData> LocalSymbolData;
|
|
std::vector<ELFSymbolData> ExternalSymbolData;
|
|
std::vector<ELFSymbolData> UndefinedSymbolData;
|
|
|
|
/// @}
|
|
|
|
bool NeedsGOT;
|
|
|
|
bool NeedsSymtabShndx;
|
|
|
|
// This holds the symbol table index of the last local symbol.
|
|
unsigned LastLocalSymbolIndex;
|
|
// This holds the .strtab section index.
|
|
unsigned StringTableIndex;
|
|
// This holds the .symtab section index.
|
|
unsigned SymbolTableIndex;
|
|
|
|
unsigned ShstrtabIndex;
|
|
|
|
|
|
virtual const MCSymbol *SymbolToReloc(const MCAssembler &Asm,
|
|
const MCValue &Target,
|
|
const MCFragment &F,
|
|
const MCFixup &Fixup,
|
|
bool IsPCRel) const;
|
|
|
|
// For arch-specific emission of explicit reloc symbol
|
|
virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
|
|
const MCValue &Target,
|
|
const MCFragment &F,
|
|
const MCFixup &Fixup,
|
|
bool IsPCRel) const {
|
|
return NULL;
|
|
}
|
|
|
|
bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
|
|
bool hasRelocationAddend() const {
|
|
return TargetObjectWriter->hasRelocationAddend();
|
|
}
|
|
|
|
public:
|
|
ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
|
|
raw_ostream &_OS, bool IsLittleEndian)
|
|
: MCObjectWriter(_OS, IsLittleEndian),
|
|
TargetObjectWriter(MOTW),
|
|
NeedsGOT(false), NeedsSymtabShndx(false){
|
|
}
|
|
|
|
virtual ~ELFObjectWriter();
|
|
|
|
void WriteWord(uint64_t W) {
|
|
if (is64Bit())
|
|
Write64(W);
|
|
else
|
|
Write32(W);
|
|
}
|
|
|
|
void StringLE16(char *buf, uint16_t Value) {
|
|
buf[0] = char(Value >> 0);
|
|
buf[1] = char(Value >> 8);
|
|
}
|
|
|
|
void StringLE32(char *buf, uint32_t Value) {
|
|
StringLE16(buf, uint16_t(Value >> 0));
|
|
StringLE16(buf + 2, uint16_t(Value >> 16));
|
|
}
|
|
|
|
void StringLE64(char *buf, uint64_t Value) {
|
|
StringLE32(buf, uint32_t(Value >> 0));
|
|
StringLE32(buf + 4, uint32_t(Value >> 32));
|
|
}
|
|
|
|
void StringBE16(char *buf ,uint16_t Value) {
|
|
buf[0] = char(Value >> 8);
|
|
buf[1] = char(Value >> 0);
|
|
}
|
|
|
|
void StringBE32(char *buf, uint32_t Value) {
|
|
StringBE16(buf, uint16_t(Value >> 16));
|
|
StringBE16(buf + 2, uint16_t(Value >> 0));
|
|
}
|
|
|
|
void StringBE64(char *buf, uint64_t Value) {
|
|
StringBE32(buf, uint32_t(Value >> 32));
|
|
StringBE32(buf + 4, uint32_t(Value >> 0));
|
|
}
|
|
|
|
void String8(MCDataFragment &F, uint8_t Value) {
|
|
char buf[1];
|
|
buf[0] = Value;
|
|
F.getContents() += StringRef(buf, 1);
|
|
}
|
|
|
|
void String16(MCDataFragment &F, uint16_t Value) {
|
|
char buf[2];
|
|
if (isLittleEndian())
|
|
StringLE16(buf, Value);
|
|
else
|
|
StringBE16(buf, Value);
|
|
F.getContents() += StringRef(buf, 2);
|
|
}
|
|
|
|
void String32(MCDataFragment &F, uint32_t Value) {
|
|
char buf[4];
|
|
if (isLittleEndian())
|
|
StringLE32(buf, Value);
|
|
else
|
|
StringBE32(buf, Value);
|
|
F.getContents() += StringRef(buf, 4);
|
|
}
|
|
|
|
void String64(MCDataFragment &F, uint64_t Value) {
|
|
char buf[8];
|
|
if (isLittleEndian())
|
|
StringLE64(buf, Value);
|
|
else
|
|
StringBE64(buf, Value);
|
|
F.getContents() += StringRef(buf, 8);
|
|
}
|
|
|
|
virtual void WriteHeader(uint64_t SectionDataSize,
|
|
unsigned NumberOfSections);
|
|
|
|
/// Default e_flags = 0
|
|
virtual void WriteEFlags() { Write32(0); }
|
|
|
|
virtual 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,
|
|
ELFSymbolData &MSD,
|
|
const MCAsmLayout &Layout);
|
|
|
|
typedef DenseMap<const MCSectionELF*, uint32_t> SectionIndexMapTy;
|
|
virtual void WriteSymbolTable(MCDataFragment *SymtabF,
|
|
MCDataFragment *ShndxF,
|
|
const MCAssembler &Asm,
|
|
const MCAsmLayout &Layout,
|
|
const SectionIndexMapTy &SectionIndexMap);
|
|
|
|
virtual void RecordRelocation(const MCAssembler &Asm,
|
|
const MCAsmLayout &Layout,
|
|
const MCFragment *Fragment,
|
|
const MCFixup &Fixup,
|
|
MCValue Target, uint64_t &FixedValue);
|
|
|
|
virtual 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,
|
|
const SectionIndexMapTy &SectionIndexMap,
|
|
RevGroupMapTy RevGroupMap,
|
|
unsigned NumRegularSections);
|
|
|
|
virtual void ComputeIndexMap(MCAssembler &Asm,
|
|
SectionIndexMapTy &SectionIndexMap,
|
|
const RelMapTy &RelMap);
|
|
|
|
void CreateRelocationSections(MCAssembler &Asm, MCAsmLayout &Layout,
|
|
RelMapTy &RelMap);
|
|
|
|
void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout,
|
|
const RelMapTy &RelMap);
|
|
|
|
virtual void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout,
|
|
SectionIndexMapTy &SectionIndexMap,
|
|
const RelMapTy &RelMap);
|
|
|
|
// Create the sections that show up in the symbol table. Currently
|
|
// those are the .note.GNU-stack section and the group sections.
|
|
virtual void CreateIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout,
|
|
GroupMapTy &GroupMap,
|
|
RevGroupMapTy &RevGroupMap,
|
|
SectionIndexMapTy &SectionIndexMap,
|
|
const RelMapTy &RelMap);
|
|
|
|
virtual void ExecutePostLayoutBinding(MCAssembler &Asm,
|
|
const MCAsmLayout &Layout);
|
|
|
|
void WriteSectionHeader(MCAssembler &Asm, const GroupMapTy &GroupMap,
|
|
const MCAsmLayout &Layout,
|
|
const SectionIndexMapTy &SectionIndexMap,
|
|
const SectionOffsetMapTy &SectionOffsetMap);
|
|
|
|
void ComputeSectionOrder(MCAssembler &Asm,
|
|
std::vector<const MCSectionELF*> &Sections);
|
|
|
|
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 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,
|
|
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 void adjustFixupOffset(const MCFixup &Fixup,
|
|
uint64_t &RelocOffset) {}
|
|
};
|
|
|
|
//===- X86ELFObjectWriter -------------------------------------------===//
|
|
|
|
class X86ELFObjectWriter : public ELFObjectWriter {
|
|
public:
|
|
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);
|
|
};
|
|
|
|
|
|
//===- ARMELFObjectWriter -------------------------------------------===//
|
|
|
|
class ARMELFObjectWriter : public ELFObjectWriter {
|
|
public:
|
|
// FIXME: MCAssembler can't yet return the Subtarget,
|
|
enum { DefaultEABIVersion = 0x05000000U };
|
|
|
|
ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW,
|
|
raw_ostream &_OS,
|
|
bool IsLittleEndian);
|
|
|
|
virtual ~ARMELFObjectWriter();
|
|
|
|
virtual void WriteEFlags();
|
|
protected:
|
|
virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
|
|
const MCValue &Target,
|
|
const MCFragment &F,
|
|
const MCFixup &Fixup,
|
|
bool IsPCRel) const;
|
|
|
|
virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
|
|
bool IsPCRel, bool IsRelocWithSymbol,
|
|
int64_t Addend);
|
|
private:
|
|
unsigned GetRelocTypeInner(const MCValue &Target,
|
|
const MCFixup &Fixup, bool IsPCRel) const;
|
|
|
|
};
|
|
|
|
//===- PPCELFObjectWriter -------------------------------------------===//
|
|
|
|
class PPCELFObjectWriter : public ELFObjectWriter {
|
|
public:
|
|
PPCELFObjectWriter(MCELFObjectTargetWriter *MOTW,
|
|
raw_ostream &_OS,
|
|
bool IsLittleEndian);
|
|
|
|
virtual ~PPCELFObjectWriter();
|
|
protected:
|
|
virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
|
|
bool IsPCRel, bool IsRelocWithSymbol,
|
|
int64_t Addend);
|
|
virtual void adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset);
|
|
};
|
|
|
|
//===- 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);
|
|
};
|
|
|
|
//===- MipsELFObjectWriter -------------------------------------------===//
|
|
|
|
class MipsELFObjectWriter : public ELFObjectWriter {
|
|
public:
|
|
MipsELFObjectWriter(MCELFObjectTargetWriter *MOTW,
|
|
raw_ostream &_OS,
|
|
bool IsLittleEndian);
|
|
|
|
virtual ~MipsELFObjectWriter();
|
|
virtual void WriteEFlags();
|
|
|
|
protected:
|
|
virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
|
|
const MCValue &Target,
|
|
const MCFragment &F,
|
|
const MCFixup &Fixup,
|
|
bool IsPCRel) const;
|
|
|
|
virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
|
|
bool IsPCRel, bool IsRelocWithSymbol,
|
|
int64_t Addend);
|
|
};
|
|
}
|
|
|
|
#endif
|