llvm-6502/include/llvm/Object/ELFObjectFile.h
Rafael Espindola 7b7c81cd35 Delete UnknownAddress. It is a perfectly valid symbol value.
getSymbolValue now returns a value that in convenient for most callers:
* 0 for undefined
* symbol size for common symbols
* offset/address for symbols the rest

Code that needs something more specific can check getSymbolFlags.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241605 91177308-0d34-0410-b5e6-96231b3b80d8
2015-07-07 17:12:59 +00:00

906 lines
28 KiB
C++

//===- ELFObjectFile.h - ELF object file implementation ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the ELFObjectFile template class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_OBJECT_ELFOBJECTFILE_H
#define LLVM_OBJECT_ELFOBJECTFILE_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Object/ELF.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cctype>
#include <limits>
#include <utility>
namespace llvm {
namespace object {
class elf_symbol_iterator;
class ELFSymbolRef;
class ELFRelocationRef;
class ELFObjectFileBase : public ObjectFile {
friend class ELFSymbolRef;
friend class ELFSectionRef;
friend class ELFRelocationRef;
protected:
ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source);
virtual uint64_t getSymbolSize(DataRefImpl Symb) const = 0;
virtual uint8_t getSymbolOther(DataRefImpl Symb) const = 0;
virtual uint8_t getSymbolELFType(DataRefImpl Symb) const = 0;
virtual uint32_t getSectionType(DataRefImpl Sec) const = 0;
virtual uint64_t getSectionFlags(DataRefImpl Sec) const = 0;
virtual ErrorOr<int64_t> getRelocationAddend(DataRefImpl Rel) const = 0;
public:
typedef iterator_range<elf_symbol_iterator> elf_symbol_iterator_range;
virtual elf_symbol_iterator_range getDynamicSymbolIterators() const = 0;
elf_symbol_iterator_range symbols() const;
static inline bool classof(const Binary *v) { return v->isELF(); }
};
class ELFSectionRef : public SectionRef {
public:
ELFSectionRef(const SectionRef &B) : SectionRef(B) {
assert(isa<ELFObjectFileBase>(SectionRef::getObject()));
}
const ELFObjectFileBase *getObject() const {
return cast<ELFObjectFileBase>(SectionRef::getObject());
}
uint32_t getType() const {
return getObject()->getSectionType(getRawDataRefImpl());
}
uint64_t getFlags() const {
return getObject()->getSectionFlags(getRawDataRefImpl());
}
};
class elf_section_iterator : public section_iterator {
public:
elf_section_iterator(const section_iterator &B) : section_iterator(B) {
assert(isa<ELFObjectFileBase>(B->getObject()));
}
const ELFSectionRef *operator->() const {
return static_cast<const ELFSectionRef *>(section_iterator::operator->());
}
const ELFSectionRef &operator*() const {
return static_cast<const ELFSectionRef &>(section_iterator::operator*());
}
};
class ELFSymbolRef : public SymbolRef {
public:
ELFSymbolRef(const SymbolRef &B) : SymbolRef(B) {
assert(isa<ELFObjectFileBase>(SymbolRef::getObject()));
}
const ELFObjectFileBase *getObject() const {
return cast<ELFObjectFileBase>(BasicSymbolRef::getObject());
}
uint64_t getSize() const {
return getObject()->getSymbolSize(getRawDataRefImpl());
}
uint8_t getOther() const {
return getObject()->getSymbolOther(getRawDataRefImpl());
}
uint8_t getELFType() const {
return getObject()->getSymbolELFType(getRawDataRefImpl());
}
};
class elf_symbol_iterator : public symbol_iterator {
public:
elf_symbol_iterator(const basic_symbol_iterator &B)
: symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
cast<ELFObjectFileBase>(B->getObject()))) {}
const ELFSymbolRef *operator->() const {
return static_cast<const ELFSymbolRef *>(symbol_iterator::operator->());
}
const ELFSymbolRef &operator*() const {
return static_cast<const ELFSymbolRef &>(symbol_iterator::operator*());
}
};
class ELFRelocationRef : public RelocationRef {
public:
ELFRelocationRef(const RelocationRef &B) : RelocationRef(B) {
assert(isa<ELFObjectFileBase>(RelocationRef::getObject()));
}
const ELFObjectFileBase *getObject() const {
return cast<ELFObjectFileBase>(RelocationRef::getObject());
}
ErrorOr<int64_t> getAddend() const {
return getObject()->getRelocationAddend(getRawDataRefImpl());
}
};
class elf_relocation_iterator : public relocation_iterator {
public:
elf_relocation_iterator(const relocation_iterator &B)
: relocation_iterator(RelocationRef(
B->getRawDataRefImpl(), cast<ELFObjectFileBase>(B->getObject()))) {}
const ELFRelocationRef *operator->() const {
return static_cast<const ELFRelocationRef *>(
relocation_iterator::operator->());
}
const ELFRelocationRef &operator*() const {
return static_cast<const ELFRelocationRef &>(
relocation_iterator::operator*());
}
};
inline ELFObjectFileBase::elf_symbol_iterator_range
ELFObjectFileBase::symbols() const {
return elf_symbol_iterator_range(symbol_begin(), symbol_end());
}
template <class ELFT> class ELFObjectFile : public ELFObjectFileBase {
uint64_t getSymbolSize(DataRefImpl Sym) const override;
public:
LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
typedef typename ELFFile<ELFT>::uintX_t uintX_t;
typedef typename ELFFile<ELFT>::Elf_Sym Elf_Sym;
typedef typename ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
typedef typename ELFFile<ELFT>::Elf_Ehdr Elf_Ehdr;
typedef typename ELFFile<ELFT>::Elf_Rel Elf_Rel;
typedef typename ELFFile<ELFT>::Elf_Rela Elf_Rela;
typedef typename ELFFile<ELFT>::Elf_Dyn Elf_Dyn;
typedef typename ELFFile<ELFT>::Elf_Dyn_Iter Elf_Dyn_Iter;
protected:
ELFFile<ELFT> EF;
void moveSymbolNext(DataRefImpl &Symb) const override;
ErrorOr<StringRef> getSymbolName(DataRefImpl Symb) const override;
ErrorOr<uint64_t> getSymbolAddress(DataRefImpl Symb) const override;
uint64_t getSymbolValueImpl(DataRefImpl Symb) const override;
uint32_t getSymbolAlignment(DataRefImpl Symb) const override;
uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const override;
uint32_t getSymbolFlags(DataRefImpl Symb) const override;
uint8_t getSymbolOther(DataRefImpl Symb) const override;
uint8_t getSymbolELFType(DataRefImpl Symb) const override;
SymbolRef::Type getSymbolType(DataRefImpl Symb) const override;
section_iterator getSymbolSection(const Elf_Sym *Symb) const;
std::error_code getSymbolSection(DataRefImpl Symb,
section_iterator &Res) const override;
void moveSectionNext(DataRefImpl &Sec) const override;
std::error_code getSectionName(DataRefImpl Sec,
StringRef &Res) const override;
uint64_t getSectionAddress(DataRefImpl Sec) const override;
uint64_t getSectionSize(DataRefImpl Sec) const override;
std::error_code getSectionContents(DataRefImpl Sec,
StringRef &Res) const override;
uint64_t getSectionAlignment(DataRefImpl Sec) const override;
bool isSectionText(DataRefImpl Sec) const override;
bool isSectionData(DataRefImpl Sec) const override;
bool isSectionBSS(DataRefImpl Sec) const override;
bool isSectionVirtual(DataRefImpl Sec) const override;
relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
relocation_iterator section_rel_end(DataRefImpl Sec) const override;
section_iterator getRelocatedSection(DataRefImpl Sec) const override;
void moveRelocationNext(DataRefImpl &Rel) const override;
uint64_t getRelocationOffset(DataRefImpl Rel) const override;
symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
uint64_t getRelocationType(DataRefImpl Rel) const override;
void getRelocationTypeName(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const override;
uint32_t getSectionType(DataRefImpl Sec) const override;
uint64_t getSectionFlags(DataRefImpl Sec) const override;
StringRef getRelocationTypeName(uint32_t Type) const;
/// \brief Get the relocation section that contains \a Rel.
const Elf_Shdr *getRelSection(DataRefImpl Rel) const {
return *EF.getSection(Rel.d.a);
}
const Elf_Sym *toELFSymIter(DataRefImpl Sym) const {
return EF.template getEntry<Elf_Sym>(Sym.d.a, Sym.d.b);
}
DataRefImpl toDRI(const Elf_Shdr *SymTable, unsigned SymbolNum) const {
DataRefImpl DRI;
if (!SymTable) {
DRI.d.a = 0;
DRI.d.b = 0;
return DRI;
}
assert(SymTable->sh_type == ELF::SHT_SYMTAB ||
SymTable->sh_type == ELF::SHT_DYNSYM);
uintptr_t SHT = reinterpret_cast<uintptr_t>(EF.section_begin());
unsigned SymTableIndex =
(reinterpret_cast<uintptr_t>(SymTable) - SHT) / sizeof(Elf_Shdr);
DRI.d.a = SymTableIndex;
DRI.d.b = SymbolNum;
return DRI;
}
const Elf_Shdr *toELFShdrIter(DataRefImpl Sec) const {
return reinterpret_cast<const Elf_Shdr *>(Sec.p);
}
DataRefImpl toDRI(const Elf_Shdr *Sec) const {
DataRefImpl DRI;
DRI.p = reinterpret_cast<uintptr_t>(Sec);
return DRI;
}
DataRefImpl toDRI(Elf_Dyn_Iter Dyn) const {
DataRefImpl DRI;
DRI.p = reinterpret_cast<uintptr_t>(Dyn.get());
return DRI;
}
bool isExportedToOtherDSO(const Elf_Sym *ESym) const {
unsigned char Binding = ESym->getBinding();
unsigned char Visibility = ESym->getVisibility();
// A symbol is exported if its binding is either GLOBAL or WEAK, and its
// visibility is either DEFAULT or PROTECTED. All other symbols are not
// exported.
if ((Binding == ELF::STB_GLOBAL || Binding == ELF::STB_WEAK) &&
(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_PROTECTED))
return true;
return false;
}
// This flag is used for classof, to distinguish ELFObjectFile from
// its subclass. If more subclasses will be created, this flag will
// have to become an enum.
bool isDyldELFObject;
public:
ELFObjectFile(MemoryBufferRef Object, std::error_code &EC);
const Elf_Rel *getRel(DataRefImpl Rel) const;
const Elf_Rela *getRela(DataRefImpl Rela) const;
const Elf_Sym *getSymbol(DataRefImpl Symb) const;
basic_symbol_iterator symbol_begin_impl() const override;
basic_symbol_iterator symbol_end_impl() const override;
elf_symbol_iterator dynamic_symbol_begin() const;
elf_symbol_iterator dynamic_symbol_end() const;
section_iterator section_begin() const override;
section_iterator section_end() const override;
ErrorOr<int64_t> getRelocationAddend(DataRefImpl Rel) const override;
uint8_t getBytesInAddress() const override;
StringRef getFileFormatName() const override;
unsigned getArch() const override;
StringRef getLoadName() const;
std::error_code getPlatformFlags(unsigned &Result) const override {
Result = EF.getHeader()->e_flags;
return std::error_code();
}
const ELFFile<ELFT> *getELFFile() const { return &EF; }
bool isDyldType() const { return isDyldELFObject; }
static inline bool classof(const Binary *v) {
return v->getType() == getELFType(ELFT::TargetEndianness == support::little,
ELFT::Is64Bits);
}
elf_symbol_iterator_range getDynamicSymbolIterators() const override;
bool isRelocatableObject() const override;
};
typedef ELFObjectFile<ELFType<support::little, false>> ELF32LEObjectFile;
typedef ELFObjectFile<ELFType<support::little, true>> ELF64LEObjectFile;
typedef ELFObjectFile<ELFType<support::big, false>> ELF32BEObjectFile;
typedef ELFObjectFile<ELFType<support::big, true>> ELF64BEObjectFile;
template <class ELFT>
void ELFObjectFile<ELFT>::moveSymbolNext(DataRefImpl &Sym) const {
++Sym.d.b;
}
template <class ELFT>
ErrorOr<StringRef> ELFObjectFile<ELFT>::getSymbolName(DataRefImpl Sym) const {
const Elf_Sym *ESym = toELFSymIter(Sym);
const Elf_Shdr *SymTableSec = *EF.getSection(Sym.d.a);
const Elf_Shdr *StringTableSec = *EF.getSection(SymTableSec->sh_link);
StringRef SymTable = *EF.getStringTable(StringTableSec);
return ESym->getName(SymTable);
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getSectionFlags(DataRefImpl Sec) const {
return toELFShdrIter(Sec)->sh_flags;
}
template <class ELFT>
uint32_t ELFObjectFile<ELFT>::getSectionType(DataRefImpl Sec) const {
return toELFShdrIter(Sec)->sh_type;
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getSymbolValueImpl(DataRefImpl Symb) const {
const Elf_Sym *ESym = getSymbol(Symb);
uint64_t Ret = ESym->st_value;
if (ESym->st_shndx == ELF::SHN_ABS)
return Ret;
const Elf_Ehdr *Header = EF.getHeader();
// Clear the ARM/Thumb or microMIPS indicator flag.
if ((Header->e_machine == ELF::EM_ARM || Header->e_machine == ELF::EM_MIPS) &&
ESym->getType() == ELF::STT_FUNC)
Ret &= ~1;
return Ret;
}
template <class ELFT>
ErrorOr<uint64_t>
ELFObjectFile<ELFT>::getSymbolAddress(DataRefImpl Symb) const {
uint64_t Result = getSymbolValue(Symb);
const Elf_Sym *ESym = getSymbol(Symb);
switch (ESym->st_shndx) {
case ELF::SHN_COMMON:
case ELF::SHN_UNDEF:
case ELF::SHN_ABS:
return Result;
}
const Elf_Ehdr *Header = EF.getHeader();
if (Header->e_type == ELF::ET_REL) {
ErrorOr<const Elf_Shdr *> SectionOrErr = EF.getSection(ESym);
if (std::error_code EC = SectionOrErr.getError())
return EC;
const Elf_Shdr *Section = *SectionOrErr;
if (Section)
Result += Section->sh_addr;
}
return Result;
}
template <class ELFT>
uint32_t ELFObjectFile<ELFT>::getSymbolAlignment(DataRefImpl Symb) const {
const Elf_Sym *Sym = toELFSymIter(Symb);
if (Sym->st_shndx == ELF::SHN_COMMON)
return Sym->st_value;
return 0;
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getSymbolSize(DataRefImpl Sym) const {
return toELFSymIter(Sym)->st_size;
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
return toELFSymIter(Symb)->st_size;
}
template <class ELFT>
uint8_t ELFObjectFile<ELFT>::getSymbolOther(DataRefImpl Symb) const {
return toELFSymIter(Symb)->st_other;
}
template <class ELFT>
uint8_t ELFObjectFile<ELFT>::getSymbolELFType(DataRefImpl Symb) const {
return toELFSymIter(Symb)->getType();
}
template <class ELFT>
SymbolRef::Type ELFObjectFile<ELFT>::getSymbolType(DataRefImpl Symb) const {
const Elf_Sym *ESym = getSymbol(Symb);
switch (ESym->getType()) {
case ELF::STT_NOTYPE:
return SymbolRef::ST_Unknown;
case ELF::STT_SECTION:
return SymbolRef::ST_Debug;
case ELF::STT_FILE:
return SymbolRef::ST_File;
case ELF::STT_FUNC:
return SymbolRef::ST_Function;
case ELF::STT_OBJECT:
case ELF::STT_COMMON:
case ELF::STT_TLS:
return SymbolRef::ST_Data;
default:
return SymbolRef::ST_Other;
}
}
template <class ELFT>
uint32_t ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Sym) const {
const Elf_Sym *ESym = toELFSymIter(Sym);
uint32_t Result = SymbolRef::SF_None;
if (ESym->getBinding() != ELF::STB_LOCAL)
Result |= SymbolRef::SF_Global;
if (ESym->getBinding() == ELF::STB_WEAK)
Result |= SymbolRef::SF_Weak;
if (ESym->st_shndx == ELF::SHN_ABS)
Result |= SymbolRef::SF_Absolute;
if (ESym->getType() == ELF::STT_FILE || ESym->getType() == ELF::STT_SECTION ||
ESym == EF.symbol_begin() || ESym == EF.dynamic_symbol_begin())
Result |= SymbolRef::SF_FormatSpecific;
if (EF.getHeader()->e_machine == ELF::EM_ARM) {
if (ErrorOr<StringRef> NameOrErr = getSymbolName(Sym)) {
StringRef Name = *NameOrErr;
if (Name.startswith("$d") || Name.startswith("$t") ||
Name.startswith("$a"))
Result |= SymbolRef::SF_FormatSpecific;
}
}
if (ESym->st_shndx == ELF::SHN_UNDEF)
Result |= SymbolRef::SF_Undefined;
if (ESym->getType() == ELF::STT_COMMON || ESym->st_shndx == ELF::SHN_COMMON)
Result |= SymbolRef::SF_Common;
if (isExportedToOtherDSO(ESym))
Result |= SymbolRef::SF_Exported;
if (ESym->getVisibility() == ELF::STV_HIDDEN)
Result |= SymbolRef::SF_Hidden;
return Result;
}
template <class ELFT>
section_iterator
ELFObjectFile<ELFT>::getSymbolSection(const Elf_Sym *ESym) const {
ErrorOr<const Elf_Shdr *> ESecOrErr = EF.getSection(ESym);
if (std::error_code EC = ESecOrErr.getError())
report_fatal_error(EC.message());
const Elf_Shdr *ESec = *ESecOrErr;
if (!ESec)
return section_end();
DataRefImpl Sec;
Sec.p = reinterpret_cast<intptr_t>(ESec);
return section_iterator(SectionRef(Sec, this));
}
template <class ELFT>
std::error_code
ELFObjectFile<ELFT>::getSymbolSection(DataRefImpl Symb,
section_iterator &Res) const {
Res = getSymbolSection(getSymbol(Symb));
return std::error_code();
}
template <class ELFT>
void ELFObjectFile<ELFT>::moveSectionNext(DataRefImpl &Sec) const {
const Elf_Shdr *ESec = toELFShdrIter(Sec);
Sec = toDRI(++ESec);
}
template <class ELFT>
std::error_code ELFObjectFile<ELFT>::getSectionName(DataRefImpl Sec,
StringRef &Result) const {
ErrorOr<StringRef> Name = EF.getSectionName(&*toELFShdrIter(Sec));
if (!Name)
return Name.getError();
Result = *Name;
return std::error_code();
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getSectionAddress(DataRefImpl Sec) const {
return toELFShdrIter(Sec)->sh_addr;
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getSectionSize(DataRefImpl Sec) const {
return toELFShdrIter(Sec)->sh_size;
}
template <class ELFT>
std::error_code
ELFObjectFile<ELFT>::getSectionContents(DataRefImpl Sec,
StringRef &Result) const {
const Elf_Shdr *EShdr = toELFShdrIter(Sec);
Result = StringRef((const char *)base() + EShdr->sh_offset, EShdr->sh_size);
return std::error_code();
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getSectionAlignment(DataRefImpl Sec) const {
return toELFShdrIter(Sec)->sh_addralign;
}
template <class ELFT>
bool ELFObjectFile<ELFT>::isSectionText(DataRefImpl Sec) const {
return toELFShdrIter(Sec)->sh_flags & ELF::SHF_EXECINSTR;
}
template <class ELFT>
bool ELFObjectFile<ELFT>::isSectionData(DataRefImpl Sec) const {
const Elf_Shdr *EShdr = toELFShdrIter(Sec);
return EShdr->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) &&
EShdr->sh_type == ELF::SHT_PROGBITS;
}
template <class ELFT>
bool ELFObjectFile<ELFT>::isSectionBSS(DataRefImpl Sec) const {
const Elf_Shdr *EShdr = toELFShdrIter(Sec);
return EShdr->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) &&
EShdr->sh_type == ELF::SHT_NOBITS;
}
template <class ELFT>
bool ELFObjectFile<ELFT>::isSectionVirtual(DataRefImpl Sec) const {
return toELFShdrIter(Sec)->sh_type == ELF::SHT_NOBITS;
}
template <class ELFT>
relocation_iterator
ELFObjectFile<ELFT>::section_rel_begin(DataRefImpl Sec) const {
DataRefImpl RelData;
uintptr_t SHT = reinterpret_cast<uintptr_t>(EF.section_begin());
RelData.d.a = (Sec.p - SHT) / EF.getHeader()->e_shentsize;
RelData.d.b = 0;
const Elf_Shdr *S = reinterpret_cast<const Elf_Shdr *>(Sec.p);
if (S->sh_type != ELF::SHT_RELA && S->sh_type != ELF::SHT_REL)
return relocation_iterator(RelocationRef(RelData, this));
const Elf_Shdr *RelSec = getRelSection(RelData);
ErrorOr<const Elf_Shdr *> SymSecOrErr = EF.getSection(RelSec->sh_link);
if (std::error_code EC = SymSecOrErr.getError())
report_fatal_error(EC.message());
const Elf_Shdr *SymSec = *SymSecOrErr;
uint32_t SymSecType = SymSec->sh_type;
if (SymSecType != ELF::SHT_SYMTAB && SymSecType != ELF::SHT_DYNSYM)
report_fatal_error("Invalid symbol table section type!");
if (SymSecType == ELF::SHT_DYNSYM)
RelData.d.b = 1;
return relocation_iterator(RelocationRef(RelData, this));
}
template <class ELFT>
relocation_iterator
ELFObjectFile<ELFT>::section_rel_end(DataRefImpl Sec) const {
const Elf_Shdr *S = reinterpret_cast<const Elf_Shdr *>(Sec.p);
relocation_iterator Begin = section_rel_begin(Sec);
if (S->sh_type != ELF::SHT_RELA && S->sh_type != ELF::SHT_REL)
return Begin;
DataRefImpl RelData = Begin->getRawDataRefImpl();
RelData.d.b += (S->sh_size / S->sh_entsize) << 1;
return relocation_iterator(RelocationRef(RelData, this));
}
template <class ELFT>
section_iterator
ELFObjectFile<ELFT>::getRelocatedSection(DataRefImpl Sec) const {
if (EF.getHeader()->e_type != ELF::ET_REL)
return section_end();
const Elf_Shdr *EShdr = toELFShdrIter(Sec);
uintX_t Type = EShdr->sh_type;
if (Type != ELF::SHT_REL && Type != ELF::SHT_RELA)
return section_end();
ErrorOr<const Elf_Shdr *> R = EF.getSection(EShdr->sh_info);
if (std::error_code EC = R.getError())
report_fatal_error(EC.message());
return section_iterator(SectionRef(toDRI(*R), this));
}
// Relocations
template <class ELFT>
void ELFObjectFile<ELFT>::moveRelocationNext(DataRefImpl &Rel) const {
Rel.d.b += 2;
}
template <class ELFT>
symbol_iterator
ELFObjectFile<ELFT>::getRelocationSymbol(DataRefImpl Rel) const {
uint32_t symbolIdx;
const Elf_Shdr *sec = getRelSection(Rel);
if (sec->sh_type == ELF::SHT_REL)
symbolIdx = getRel(Rel)->getSymbol(EF.isMips64EL());
else
symbolIdx = getRela(Rel)->getSymbol(EF.isMips64EL());
if (!symbolIdx)
return symbol_end();
bool IsDyn = Rel.d.b & 1;
DataRefImpl SymbolData;
if (IsDyn)
SymbolData = toDRI(EF.getDotDynSymSec(), symbolIdx);
else
SymbolData = toDRI(EF.getDotSymtabSec(), symbolIdx);
return symbol_iterator(SymbolRef(SymbolData, this));
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getRelocationOffset(DataRefImpl Rel) const {
assert(EF.getHeader()->e_type == ELF::ET_REL &&
"Only relocatable object files have relocation offsets");
const Elf_Shdr *sec = getRelSection(Rel);
if (sec->sh_type == ELF::SHT_REL)
return getRel(Rel)->r_offset;
return getRela(Rel)->r_offset;
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getRelocationType(DataRefImpl Rel) const {
const Elf_Shdr *sec = getRelSection(Rel);
if (sec->sh_type == ELF::SHT_REL)
return getRel(Rel)->getType(EF.isMips64EL());
else
return getRela(Rel)->getType(EF.isMips64EL());
}
template <class ELFT>
StringRef ELFObjectFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
return getELFRelocationTypeName(EF.getHeader()->e_machine, Type);
}
template <class ELFT>
void ELFObjectFile<ELFT>::getRelocationTypeName(
DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
uint32_t type = getRelocationType(Rel);
EF.getRelocationTypeName(type, Result);
}
template <class ELFT>
ErrorOr<int64_t>
ELFObjectFile<ELFT>::getRelocationAddend(DataRefImpl Rel) const {
if (getRelSection(Rel)->sh_type != ELF::SHT_RELA)
return object_error::parse_failed;
return (int64_t)getRela(Rel)->r_addend;
}
template <class ELFT>
const typename ELFFile<ELFT>::Elf_Sym *
ELFObjectFile<ELFT>::getSymbol(DataRefImpl Symb) const {
return &*toELFSymIter(Symb);
}
template <class ELFT>
const typename ELFObjectFile<ELFT>::Elf_Rel *
ELFObjectFile<ELFT>::getRel(DataRefImpl Rel) const {
assert(getRelSection(Rel)->sh_type == ELF::SHT_REL);
return EF.template getEntry<Elf_Rel>(Rel.d.a, Rel.d.b >> 1);
}
template <class ELFT>
const typename ELFObjectFile<ELFT>::Elf_Rela *
ELFObjectFile<ELFT>::getRela(DataRefImpl Rela) const {
assert(getRelSection(Rela)->sh_type == ELF::SHT_RELA);
return EF.template getEntry<Elf_Rela>(Rela.d.a, Rela.d.b >> 1);
}
template <class ELFT>
ELFObjectFile<ELFT>::ELFObjectFile(MemoryBufferRef Object, std::error_code &EC)
: ELFObjectFileBase(
getELFType(static_cast<endianness>(ELFT::TargetEndianness) ==
support::little,
ELFT::Is64Bits),
Object),
EF(Data.getBuffer(), EC) {}
template <class ELFT>
basic_symbol_iterator ELFObjectFile<ELFT>::symbol_begin_impl() const {
DataRefImpl Sym = toDRI(EF.getDotSymtabSec(), 0);
return basic_symbol_iterator(SymbolRef(Sym, this));
}
template <class ELFT>
basic_symbol_iterator ELFObjectFile<ELFT>::symbol_end_impl() const {
const Elf_Shdr *SymTab = EF.getDotSymtabSec();
if (!SymTab)
return symbol_begin_impl();
DataRefImpl Sym = toDRI(SymTab, SymTab->sh_size / sizeof(Elf_Sym));
return basic_symbol_iterator(SymbolRef(Sym, this));
}
template <class ELFT>
elf_symbol_iterator ELFObjectFile<ELFT>::dynamic_symbol_begin() const {
DataRefImpl Sym = toDRI(EF.getDotDynSymSec(), 0);
return symbol_iterator(SymbolRef(Sym, this));
}
template <class ELFT>
elf_symbol_iterator ELFObjectFile<ELFT>::dynamic_symbol_end() const {
const Elf_Shdr *SymTab = EF.getDotDynSymSec();
DataRefImpl Sym = toDRI(SymTab, SymTab->sh_size / sizeof(Elf_Sym));
return basic_symbol_iterator(SymbolRef(Sym, this));
}
template <class ELFT>
section_iterator ELFObjectFile<ELFT>::section_begin() const {
return section_iterator(SectionRef(toDRI(EF.section_begin()), this));
}
template <class ELFT>
section_iterator ELFObjectFile<ELFT>::section_end() const {
return section_iterator(SectionRef(toDRI(EF.section_end()), this));
}
template <class ELFT>
StringRef ELFObjectFile<ELFT>::getLoadName() const {
Elf_Dyn_Iter DI = EF.dynamic_table_begin();
Elf_Dyn_Iter DE = EF.dynamic_table_end();
while (DI != DE && DI->getTag() != ELF::DT_SONAME)
++DI;
if (DI != DE)
return EF.getDynamicString(DI->getVal());
return "";
}
template <class ELFT>
uint8_t ELFObjectFile<ELFT>::getBytesInAddress() const {
return ELFT::Is64Bits ? 8 : 4;
}
template <class ELFT>
StringRef ELFObjectFile<ELFT>::getFileFormatName() const {
bool IsLittleEndian = ELFT::TargetEndianness == support::little;
switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
case ELF::ELFCLASS32:
switch (EF.getHeader()->e_machine) {
case ELF::EM_386:
return "ELF32-i386";
case ELF::EM_X86_64:
return "ELF32-x86-64";
case ELF::EM_ARM:
return (IsLittleEndian ? "ELF32-arm-little" : "ELF32-arm-big");
case ELF::EM_HEXAGON:
return "ELF32-hexagon";
case ELF::EM_MIPS:
return "ELF32-mips";
case ELF::EM_PPC:
return "ELF32-ppc";
case ELF::EM_SPARC:
case ELF::EM_SPARC32PLUS:
return "ELF32-sparc";
default:
return "ELF32-unknown";
}
case ELF::ELFCLASS64:
switch (EF.getHeader()->e_machine) {
case ELF::EM_386:
return "ELF64-i386";
case ELF::EM_X86_64:
return "ELF64-x86-64";
case ELF::EM_AARCH64:
return (IsLittleEndian ? "ELF64-aarch64-little" : "ELF64-aarch64-big");
case ELF::EM_PPC64:
return "ELF64-ppc64";
case ELF::EM_S390:
return "ELF64-s390";
case ELF::EM_SPARCV9:
return "ELF64-sparc";
case ELF::EM_MIPS:
return "ELF64-mips";
default:
return "ELF64-unknown";
}
default:
// FIXME: Proper error handling.
report_fatal_error("Invalid ELFCLASS!");
}
}
template <class ELFT>
unsigned ELFObjectFile<ELFT>::getArch() const {
bool IsLittleEndian = ELFT::TargetEndianness == support::little;
switch (EF.getHeader()->e_machine) {
case ELF::EM_386:
return Triple::x86;
case ELF::EM_X86_64:
return Triple::x86_64;
case ELF::EM_AARCH64:
return Triple::aarch64;
case ELF::EM_ARM:
return Triple::arm;
case ELF::EM_HEXAGON:
return Triple::hexagon;
case ELF::EM_MIPS:
switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
case ELF::ELFCLASS32:
return IsLittleEndian ? Triple::mipsel : Triple::mips;
case ELF::ELFCLASS64:
return IsLittleEndian ? Triple::mips64el : Triple::mips64;
default:
report_fatal_error("Invalid ELFCLASS!");
}
case ELF::EM_PPC:
return Triple::ppc;
case ELF::EM_PPC64:
return IsLittleEndian ? Triple::ppc64le : Triple::ppc64;
case ELF::EM_S390:
return Triple::systemz;
case ELF::EM_SPARC:
case ELF::EM_SPARC32PLUS:
return IsLittleEndian ? Triple::sparcel : Triple::sparc;
case ELF::EM_SPARCV9:
return Triple::sparcv9;
default:
return Triple::UnknownArch;
}
}
template <class ELFT>
ELFObjectFileBase::elf_symbol_iterator_range
ELFObjectFile<ELFT>::getDynamicSymbolIterators() const {
return make_range(dynamic_symbol_begin(), dynamic_symbol_end());
}
template <class ELFT> bool ELFObjectFile<ELFT>::isRelocatableObject() const {
return EF.getHeader()->e_type == ELF::ET_REL;
}
}
}
#endif