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llvm-mirror/include/llvm/Object/ELFObjectFile.h
Rafael Espindola 23a6de77e7 Fix a nomenclature error in llvm-nm. 
What llvm-nm prints depends on the file format. On ELF for example, if the
file is relocatable, it prints offsets. If it is not, it prints addresses.
Since it doesn't really need to care what it is that it is printing, use the
generic term value.

Fix or implement getSymbolValue to keep llvm-nm working.

llvm-svn: 205479
2014-04-02 22:52:46 +00:00

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//===- 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_ELF_OBJECT_FILE_H
#define LLVM_OBJECT_ELF_OBJECT_FILE_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 {
template <class ELFT>
class ELFObjectFile : public ObjectFile {
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_Rel Elf_Rel;
typedef typename ELFFile<ELFT>::Elf_Rela Elf_Rela;
typedef typename ELFFile<ELFT>::Elf_Dyn Elf_Dyn;
typedef typename ELFFile<ELFT>::Elf_Sym_Iter Elf_Sym_Iter;
typedef typename ELFFile<ELFT>::Elf_Shdr_Iter Elf_Shdr_Iter;
typedef typename ELFFile<ELFT>::Elf_Dyn_Iter Elf_Dyn_Iter;
protected:
ELFFile<ELFT> EF;
void moveSymbolNext(DataRefImpl &Symb) const override;
error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const override;
error_code getSymbolFileOffset(DataRefImpl Symb,
uint64_t &Res) const override;
error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const override;
error_code getSymbolAlignment(DataRefImpl Symb, uint32_t &Res) const override;
error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const override;
uint32_t getSymbolFlags(DataRefImpl Symb) const override;
error_code getSymbolType(DataRefImpl Symb,
SymbolRef::Type &Res) const override;
error_code getSymbolSection(DataRefImpl Symb,
section_iterator &Res) const override;
error_code getSymbolValue(DataRefImpl Symb, uint64_t &Val) const override;
error_code getLibraryNext(DataRefImpl Data,
LibraryRef &Result) const override;
error_code getLibraryPath(DataRefImpl Data, StringRef &Res) const override;
void moveSectionNext(DataRefImpl &Sec) const override;
error_code getSectionName(DataRefImpl Sec, StringRef &Res) const override;
error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const override;
error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const override;
error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const override;
error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const override;
error_code isSectionText(DataRefImpl Sec, bool &Res) const override;
error_code isSectionData(DataRefImpl Sec, bool &Res) const override;
error_code isSectionBSS(DataRefImpl Sec, bool &Res) const override;
error_code isSectionRequiredForExecution(DataRefImpl Sec,
bool &Res) const override;
error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const override;
error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const override;
error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const override;
error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
bool &Result) const override;
relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
relocation_iterator section_rel_end(DataRefImpl Sec) const override;
bool section_rel_empty(DataRefImpl Sec) const override;
section_iterator getRelocatedSection(DataRefImpl Sec) const override;
void moveRelocationNext(DataRefImpl &Rel) const override;
error_code getRelocationAddress(DataRefImpl Rel,
uint64_t &Res) const override;
error_code getRelocationOffset(DataRefImpl Rel, uint64_t &Res) const override;
symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
error_code getRelocationType(DataRefImpl Rel, uint64_t &Res) const override;
error_code getRelocationTypeName(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const override;
error_code getRelocationValueString(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const override;
uint64_t getROffset(DataRefImpl Rel) const;
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_Rel *getRel(DataRefImpl Rel) const;
const Elf_Rela *getRela(DataRefImpl Rela) const;
Elf_Sym_Iter toELFSymIter(DataRefImpl Symb) const {
bool IsDynamic = Symb.p & 1;
if (IsDynamic)
return Elf_Sym_Iter(
EF.begin_dynamic_symbols().getEntSize(),
reinterpret_cast<const char *>(Symb.p & ~uintptr_t(1)), IsDynamic);
return Elf_Sym_Iter(EF.begin_symbols().getEntSize(),
reinterpret_cast<const char *>(Symb.p), IsDynamic);
}
DataRefImpl toDRI(Elf_Sym_Iter Symb) const {
DataRefImpl DRI;
DRI.p = reinterpret_cast<uintptr_t>(Symb.get()) |
static_cast<uintptr_t>(Symb.isDynamic());
return DRI;
}
Elf_Shdr_Iter toELFShdrIter(DataRefImpl Sec) const {
return Elf_Shdr_Iter(EF.getHeader()->e_shentsize,
reinterpret_cast<const char *>(Sec.p));
}
DataRefImpl toDRI(Elf_Shdr_Iter Sec) const {
DataRefImpl DRI;
DRI.p = reinterpret_cast<uintptr_t>(Sec.get());
return DRI;
}
DataRefImpl toDRI(const Elf_Shdr *Sec) const {
DataRefImpl DRI;
DRI.p = reinterpret_cast<uintptr_t>(Sec);
return DRI;
}
Elf_Dyn_Iter toELFDynIter(DataRefImpl Dyn) const {
return Elf_Dyn_Iter(EF.begin_dynamic_table().getEntSize(),
reinterpret_cast<const char *>(Dyn.p));
}
DataRefImpl toDRI(Elf_Dyn_Iter Dyn) const {
DataRefImpl DRI;
DRI.p = reinterpret_cast<uintptr_t>(Dyn.get());
return DRI;
}
// 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(MemoryBuffer *Object, error_code &EC, bool BufferOwned = true);
const Elf_Sym *getSymbol(DataRefImpl Symb) const;
basic_symbol_iterator symbol_begin_impl() const override;
basic_symbol_iterator symbol_end_impl() const override;
symbol_iterator dynamic_symbol_begin() const;
symbol_iterator dynamic_symbol_end() const;
section_iterator section_begin() const override;
section_iterator section_end() const override;
library_iterator needed_library_begin() const override;
library_iterator needed_library_end() const override;
error_code getRelocationAddend(DataRefImpl Rel, int64_t &Res) const;
error_code getSymbolVersion(SymbolRef Symb, StringRef &Version,
bool &IsDefault) const;
uint8_t getBytesInAddress() const override;
StringRef getFileFormatName() const override;
unsigned getArch() const override;
StringRef getLoadName() const override;
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);
}
};
// Use an alignment of 2 for the typedefs since that is the worst case for
// ELF files in archives.
typedef ELFObjectFile<ELFType<support::little, 2, false> > ELF32LEObjectFile;
typedef ELFObjectFile<ELFType<support::little, 2, true> > ELF64LEObjectFile;
typedef ELFObjectFile<ELFType<support::big, 2, false> > ELF32BEObjectFile;
typedef ELFObjectFile<ELFType<support::big, 2, true> > ELF64BEObjectFile;
template <class ELFT>
void ELFObjectFile<ELFT>::moveSymbolNext(DataRefImpl &Symb) const {
Symb = toDRI(++toELFSymIter(Symb));
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolName(DataRefImpl Symb,
StringRef &Result) const {
ErrorOr<StringRef> Name = EF.getSymbolName(toELFSymIter(Symb));
if (!Name)
return Name.getError();
Result = *Name;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolVersion(SymbolRef SymRef,
StringRef &Version,
bool &IsDefault) const {
DataRefImpl Symb = SymRef.getRawDataRefImpl();
const Elf_Sym *symb = getSymbol(Symb);
ErrorOr<StringRef> Ver =
EF.getSymbolVersion(EF.getSection(Symb.d.b), symb, IsDefault);
if (!Ver)
return Ver.getError();
Version = *Ver;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolFileOffset(DataRefImpl Symb,
uint64_t &Result) const {
const Elf_Sym *ESym = getSymbol(Symb);
const Elf_Shdr *ESec;
switch (EF.getSymbolTableIndex(ESym)) {
case ELF::SHN_COMMON:
// Unintialized symbols have no offset in the object file
case ELF::SHN_UNDEF:
Result = UnknownAddressOrSize;
return object_error::success;
case ELF::SHN_ABS:
Result = ESym->st_value;
return object_error::success;
default:
ESec = EF.getSection(ESym);
}
switch (ESym->getType()) {
case ELF::STT_SECTION:
Result = ESec ? ESec->sh_offset : UnknownAddressOrSize;
return object_error::success;
case ELF::STT_FUNC:
case ELF::STT_OBJECT:
case ELF::STT_NOTYPE:
Result = ESym->st_value + (ESec ? ESec->sh_offset : 0);
return object_error::success;
default:
Result = UnknownAddressOrSize;
return object_error::success;
}
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolAddress(DataRefImpl Symb,
uint64_t &Result) const {
const Elf_Sym *ESym = getSymbol(Symb);
const Elf_Shdr *ESec;
switch (EF.getSymbolTableIndex(ESym)) {
case ELF::SHN_COMMON:
case ELF::SHN_UNDEF:
Result = UnknownAddressOrSize;
return object_error::success;
case ELF::SHN_ABS:
Result = ESym->st_value;
return object_error::success;
default:
ESec = EF.getSection(ESym);
}
switch (ESym->getType()) {
case ELF::STT_SECTION:
Result = ESec ? ESec->sh_addr : UnknownAddressOrSize;
return object_error::success;
case ELF::STT_FUNC:
case ELF::STT_OBJECT:
case ELF::STT_NOTYPE:
case ELF::STT_TLS:
bool IsRelocatable;
switch (EF.getHeader()->e_type) {
case ELF::ET_EXEC:
case ELF::ET_DYN:
IsRelocatable = false;
break;
default:
IsRelocatable = true;
}
Result = ESym->st_value;
// Clear the ARM/Thumb indicator flag.
if (EF.getHeader()->e_machine == ELF::EM_ARM)
Result &= ~1;
if (IsRelocatable && ESec != 0)
Result += ESec->sh_addr;
return object_error::success;
default:
Result = UnknownAddressOrSize;
return object_error::success;
}
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolAlignment(DataRefImpl Symb,
uint32_t &Res) const {
Elf_Sym_Iter Sym = toELFSymIter(Symb);
if (Sym->st_shndx == ELF::SHN_COMMON)
Res = Sym->st_value;
else
Res = 0;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolSize(DataRefImpl Symb,
uint64_t &Result) const {
Result = toELFSymIter(Symb)->st_size;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolType(DataRefImpl Symb,
SymbolRef::Type &Result) const {
const Elf_Sym *ESym = getSymbol(Symb);
switch (ESym->getType()) {
case ELF::STT_NOTYPE:
Result = SymbolRef::ST_Unknown;
break;
case ELF::STT_SECTION:
Result = SymbolRef::ST_Debug;
break;
case ELF::STT_FILE:
Result = SymbolRef::ST_File;
break;
case ELF::STT_FUNC:
Result = SymbolRef::ST_Function;
break;
case ELF::STT_OBJECT:
case ELF::STT_COMMON:
case ELF::STT_TLS:
Result = SymbolRef::ST_Data;
break;
default:
Result = SymbolRef::ST_Other;
break;
}
return object_error::success;
}
template <class ELFT>
uint32_t ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Symb) const {
Elf_Sym_Iter EIter = toELFSymIter(Symb);
const Elf_Sym *ESym = &*EIter;
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 ||
EIter == EF.begin_symbols() || EIter == EF.begin_dynamic_symbols())
Result |= SymbolRef::SF_FormatSpecific;
if (EF.getSymbolTableIndex(ESym) == ELF::SHN_UNDEF)
Result |= SymbolRef::SF_Undefined;
if (ESym->getType() == ELF::STT_COMMON ||
EF.getSymbolTableIndex(ESym) == ELF::SHN_COMMON)
Result |= SymbolRef::SF_Common;
return Result;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolSection(DataRefImpl Symb,
section_iterator &Res) const {
const Elf_Sym *ESym = getSymbol(Symb);
const Elf_Shdr *ESec = EF.getSection(ESym);
if (!ESec)
Res = section_end();
else {
DataRefImpl Sec;
Sec.p = reinterpret_cast<intptr_t>(ESec);
Res = section_iterator(SectionRef(Sec, this));
}
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSymbolValue(DataRefImpl Symb,
uint64_t &Val) const {
const Elf_Sym *ESym = getSymbol(Symb);
switch (EF.getSymbolTableIndex(ESym)) {
default:
Val = ESym->st_value;
break;
case ELF::SHN_COMMON:
case ELF::SHN_UNDEF:
Val = UnknownAddressOrSize;
break;
}
return object_error::success;
}
template <class ELFT>
void ELFObjectFile<ELFT>::moveSectionNext(DataRefImpl &Sec) const {
Sec = toDRI(++toELFShdrIter(Sec));
}
template <class ELFT>
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 object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSectionAddress(DataRefImpl Sec,
uint64_t &Result) const {
Result = toELFShdrIter(Sec)->sh_addr;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSectionSize(DataRefImpl Sec,
uint64_t &Result) const {
Result = toELFShdrIter(Sec)->sh_size;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSectionContents(DataRefImpl Sec,
StringRef &Result) const {
Elf_Shdr_Iter EShdr = toELFShdrIter(Sec);
Result = StringRef((const char *)base() + EShdr->sh_offset, EShdr->sh_size);
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getSectionAlignment(DataRefImpl Sec,
uint64_t &Result) const {
Result = toELFShdrIter(Sec)->sh_addralign;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::isSectionText(DataRefImpl Sec,
bool &Result) const {
Result = toELFShdrIter(Sec)->sh_flags & ELF::SHF_EXECINSTR;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::isSectionData(DataRefImpl Sec,
bool &Result) const {
Elf_Shdr_Iter EShdr = toELFShdrIter(Sec);
Result = EShdr->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) &&
EShdr->sh_type == ELF::SHT_PROGBITS;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::isSectionBSS(DataRefImpl Sec,
bool &Result) const {
Elf_Shdr_Iter EShdr = toELFShdrIter(Sec);
Result = EShdr->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) &&
EShdr->sh_type == ELF::SHT_NOBITS;
return object_error::success;
}
template <class ELFT>
error_code
ELFObjectFile<ELFT>::isSectionRequiredForExecution(DataRefImpl Sec,
bool &Result) const {
Result = toELFShdrIter(Sec)->sh_flags & ELF::SHF_ALLOC;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::isSectionVirtual(DataRefImpl Sec,
bool &Result) const {
Result = toELFShdrIter(Sec)->sh_type == ELF::SHT_NOBITS;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::isSectionZeroInit(DataRefImpl Sec,
bool &Result) const {
Result = toELFShdrIter(Sec)->sh_type == ELF::SHT_NOBITS;
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::isSectionReadOnlyData(DataRefImpl Sec,
bool &Result) const {
Elf_Shdr_Iter EShdr = toELFShdrIter(Sec);
Result = !(EShdr->sh_flags & (ELF::SHF_WRITE | ELF::SHF_EXECINSTR));
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::sectionContainsSymbol(DataRefImpl Sec,
DataRefImpl Symb,
bool &Result) const {
Elf_Sym_Iter ESym = toELFSymIter(Symb);
uintX_t Index = ESym->st_shndx;
bool Reserved = Index >= ELF::SHN_LORESERVE && Index <= ELF::SHN_HIRESERVE;
Result = !Reserved && (&*toELFShdrIter(Sec) == EF.getSection(ESym->st_shndx));
return object_error::success;
}
template <class ELFT>
relocation_iterator
ELFObjectFile<ELFT>::section_rel_begin(DataRefImpl Sec) const {
DataRefImpl RelData;
uintptr_t SHT = reinterpret_cast<uintptr_t>(EF.begin_sections().get());
RelData.d.a = (Sec.p - SHT) / EF.getHeader()->e_shentsize;
RelData.d.b = 0;
return relocation_iterator(RelocationRef(RelData, this));
}
template <class ELFT>
relocation_iterator
ELFObjectFile<ELFT>::section_rel_end(DataRefImpl Sec) const {
DataRefImpl RelData;
uintptr_t SHT = reinterpret_cast<uintptr_t>(EF.begin_sections().get());
const Elf_Shdr *S = reinterpret_cast<const Elf_Shdr *>(Sec.p);
RelData.d.a = (Sec.p - SHT) / EF.getHeader()->e_shentsize;
if (S->sh_type != ELF::SHT_RELA && S->sh_type != ELF::SHT_REL)
RelData.d.b = 0;
else
RelData.d.b = S->sh_size / S->sh_entsize;
return relocation_iterator(RelocationRef(RelData, this));
}
template <class ELFT>
bool ELFObjectFile<ELFT>::section_rel_empty(DataRefImpl Sec) const {
const Elf_Shdr *S = reinterpret_cast<const Elf_Shdr *>(Sec.p);
return S->sh_size == 0;
}
template <class ELFT>
section_iterator
ELFObjectFile<ELFT>::getRelocatedSection(DataRefImpl Sec) const {
if (EF.getHeader()->e_type != ELF::ET_REL)
return section_end();
Elf_Shdr_Iter EShdr = toELFShdrIter(Sec);
uintX_t Type = EShdr->sh_type;
if (Type != ELF::SHT_REL && Type != ELF::SHT_RELA)
return section_end();
const Elf_Shdr *R = EF.getSection(EShdr->sh_info);
return section_iterator(SectionRef(toDRI(R), this));
}
// Relocations
template <class ELFT>
void ELFObjectFile<ELFT>::moveRelocationNext(DataRefImpl &Rel) const {
++Rel.d.b;
}
template <class ELFT>
symbol_iterator
ELFObjectFile<ELFT>::getRelocationSymbol(DataRefImpl Rel) const {
uint32_t symbolIdx;
const Elf_Shdr *sec = getRelSection(Rel);
switch (sec->sh_type) {
default:
report_fatal_error("Invalid section type in Rel!");
case ELF::SHT_REL: {
symbolIdx = getRel(Rel)->getSymbol(EF.isMips64EL());
break;
}
case ELF::SHT_RELA: {
symbolIdx = getRela(Rel)->getSymbol(EF.isMips64EL());
break;
}
}
if (!symbolIdx)
return symbol_end();
const Elf_Shdr *SymSec = EF.getSection(sec->sh_link);
DataRefImpl SymbolData;
switch (SymSec->sh_type) {
default:
report_fatal_error("Invalid symbol table section type!");
case ELF::SHT_SYMTAB:
SymbolData = toDRI(EF.begin_symbols() + symbolIdx);
break;
case ELF::SHT_DYNSYM:
SymbolData = toDRI(EF.begin_dynamic_symbols() + symbolIdx);
break;
}
return symbol_iterator(SymbolRef(SymbolData, this));
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getRelocationAddress(DataRefImpl Rel,
uint64_t &Result) const {
assert((EF.getHeader()->e_type == ELF::ET_EXEC ||
EF.getHeader()->e_type == ELF::ET_DYN) &&
"Only executable and shared objects files have relocation addresses");
Result = getROffset(Rel);
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getRelocationOffset(DataRefImpl Rel,
uint64_t &Result) const {
assert(EF.getHeader()->e_type == ELF::ET_REL &&
"Only relocatable object files have relocation offsets");
Result = getROffset(Rel);
return object_error::success;
}
template <class ELFT>
uint64_t ELFObjectFile<ELFT>::getROffset(DataRefImpl Rel) const {
const Elf_Shdr *sec = getRelSection(Rel);
switch (sec->sh_type) {
default:
report_fatal_error("Invalid section type in Rel!");
case ELF::SHT_REL:
return getRel(Rel)->r_offset;
case ELF::SHT_RELA:
return getRela(Rel)->r_offset;
}
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getRelocationType(DataRefImpl Rel,
uint64_t &Result) const {
const Elf_Shdr *sec = getRelSection(Rel);
switch (sec->sh_type) {
default:
report_fatal_error("Invalid section type in Rel!");
case ELF::SHT_REL: {
Result = getRel(Rel)->getType(EF.isMips64EL());
break;
}
case ELF::SHT_RELA: {
Result = getRela(Rel)->getType(EF.isMips64EL());
break;
}
}
return object_error::success;
}
template <class ELFT>
StringRef ELFObjectFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
return getELFRelocationTypeName(EF.getHeader()->e_machine, Type);
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getRelocationTypeName(
DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
const Elf_Shdr *sec = getRelSection(Rel);
uint32_t type;
switch (sec->sh_type) {
default:
return object_error::parse_failed;
case ELF::SHT_REL: {
type = getRel(Rel)->getType(EF.isMips64EL());
break;
}
case ELF::SHT_RELA: {
type = getRela(Rel)->getType(EF.isMips64EL());
break;
}
}
EF.getRelocationTypeName(type, Result);
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getRelocationAddend(DataRefImpl Rel,
int64_t &Result) const {
const Elf_Shdr *sec = getRelSection(Rel);
switch (sec->sh_type) {
default:
report_fatal_error("Invalid section type in Rel!");
case ELF::SHT_REL: {
Result = 0;
return object_error::success;
}
case ELF::SHT_RELA: {
Result = getRela(Rel)->r_addend;
return object_error::success;
}
}
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getRelocationValueString(
DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
const Elf_Shdr *sec = getRelSection(Rel);
uint8_t type;
StringRef res;
int64_t addend = 0;
uint16_t symbol_index = 0;
switch (sec->sh_type) {
default:
return object_error::parse_failed;
case ELF::SHT_REL: {
type = getRel(Rel)->getType(EF.isMips64EL());
symbol_index = getRel(Rel)->getSymbol(EF.isMips64EL());
// TODO: Read implicit addend from section data.
break;
}
case ELF::SHT_RELA: {
type = getRela(Rel)->getType(EF.isMips64EL());
symbol_index = getRela(Rel)->getSymbol(EF.isMips64EL());
addend = getRela(Rel)->r_addend;
break;
}
}
const Elf_Sym *symb =
EF.template getEntry<Elf_Sym>(sec->sh_link, symbol_index);
ErrorOr<StringRef> SymName =
EF.getSymbolName(EF.getSection(sec->sh_link), symb);
if (!SymName)
return SymName.getError();
switch (EF.getHeader()->e_machine) {
case ELF::EM_X86_64:
switch (type) {
case ELF::R_X86_64_PC8:
case ELF::R_X86_64_PC16:
case ELF::R_X86_64_PC32: {
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
fmt << *SymName << (addend < 0 ? "" : "+") << addend << "-P";
fmt.flush();
Result.append(fmtbuf.begin(), fmtbuf.end());
} break;
case ELF::R_X86_64_8:
case ELF::R_X86_64_16:
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S:
case ELF::R_X86_64_64: {
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
fmt << *SymName << (addend < 0 ? "" : "+") << addend;
fmt.flush();
Result.append(fmtbuf.begin(), fmtbuf.end());
} break;
default:
res = "Unknown";
}
break;
case ELF::EM_AARCH64: {
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
fmt << *SymName;
if (addend != 0)
fmt << (addend < 0 ? "" : "+") << addend;
fmt.flush();
Result.append(fmtbuf.begin(), fmtbuf.end());
break;
}
case ELF::EM_ARM:
case ELF::EM_HEXAGON:
case ELF::EM_MIPS:
res = *SymName;
break;
default:
res = "Unknown";
}
if (Result.empty())
Result.append(res.begin(), res.end());
return object_error::success;
}
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 {
return EF.template getEntry<Elf_Rel>(Rel.d.a, Rel.d.b);
}
template <class ELFT>
const typename ELFObjectFile<ELFT>::Elf_Rela *
ELFObjectFile<ELFT>::getRela(DataRefImpl Rela) const {
return EF.template getEntry<Elf_Rela>(Rela.d.a, Rela.d.b);
}
template <class ELFT>
ELFObjectFile<ELFT>::ELFObjectFile(MemoryBuffer *Object, error_code &ec,
bool BufferOwned)
: ObjectFile(getELFType(static_cast<endianness>(ELFT::TargetEndianness) ==
support::little,
ELFT::Is64Bits),
Object, BufferOwned),
EF(Object, ec) {}
template <class ELFT>
basic_symbol_iterator ELFObjectFile<ELFT>::symbol_begin_impl() const {
return basic_symbol_iterator(SymbolRef(toDRI(EF.begin_symbols()), this));
}
template <class ELFT>
basic_symbol_iterator ELFObjectFile<ELFT>::symbol_end_impl() const {
return basic_symbol_iterator(SymbolRef(toDRI(EF.end_symbols()), this));
}
template <class ELFT>
symbol_iterator ELFObjectFile<ELFT>::dynamic_symbol_begin() const {
return symbol_iterator(SymbolRef(toDRI(EF.begin_dynamic_symbols()), this));
}
template <class ELFT>
symbol_iterator ELFObjectFile<ELFT>::dynamic_symbol_end() const {
return symbol_iterator(SymbolRef(toDRI(EF.end_dynamic_symbols()), this));
}
template <class ELFT>
section_iterator ELFObjectFile<ELFT>::section_begin() const {
return section_iterator(SectionRef(toDRI(EF.begin_sections()), this));
}
template <class ELFT>
section_iterator ELFObjectFile<ELFT>::section_end() const {
return section_iterator(SectionRef(toDRI(EF.end_sections()), this));
}
template <class ELFT>
StringRef ELFObjectFile<ELFT>::getLoadName() const {
Elf_Dyn_Iter DI = EF.begin_dynamic_table();
Elf_Dyn_Iter DE = EF.end_dynamic_table();
while (DI != DE && DI->getTag() != ELF::DT_SONAME)
++DI;
if (DI != DE)
return EF.getDynamicString(DI->getVal());
return "";
}
template <class ELFT>
library_iterator ELFObjectFile<ELFT>::needed_library_begin() const {
Elf_Dyn_Iter DI = EF.begin_dynamic_table();
Elf_Dyn_Iter DE = EF.end_dynamic_table();
while (DI != DE && DI->getTag() != ELF::DT_SONAME)
++DI;
return library_iterator(LibraryRef(toDRI(DI), this));
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getLibraryNext(DataRefImpl Data,
LibraryRef &Result) const {
Elf_Dyn_Iter DI = toELFDynIter(Data);
Elf_Dyn_Iter DE = EF.end_dynamic_table();
// Skip to the next DT_NEEDED entry.
do
++DI;
while (DI != DE && DI->getTag() != ELF::DT_NEEDED);
Result = LibraryRef(toDRI(DI), this);
return object_error::success;
}
template <class ELFT>
error_code ELFObjectFile<ELFT>::getLibraryPath(DataRefImpl Data,
StringRef &Res) const {
Res = EF.getDynamicString(toELFDynIter(Data)->getVal());
return object_error::success;
}
template <class ELFT>
library_iterator ELFObjectFile<ELFT>::needed_library_end() const {
return library_iterator(LibraryRef(toDRI(EF.end_dynamic_table()), this));
}
template <class ELFT>
uint8_t ELFObjectFile<ELFT>::getBytesInAddress() const {
return ELFT::Is64Bits ? 8 : 4;
}
template <class ELFT>
StringRef ELFObjectFile<ELFT>::getFileFormatName() const {
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 "ELF32-arm";
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 "ELF64-aarch64";
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 {
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:
return (ELFT::TargetEndianness == support::little) ? Triple::mipsel
: Triple::mips;
case ELF::EM_PPC64:
return (ELFT::TargetEndianness == support::little) ? Triple::ppc64le
: Triple::ppc64;
case ELF::EM_S390:
return Triple::systemz;
case ELF::EM_SPARC:
case ELF::EM_SPARC32PLUS:
return Triple::sparc;
case ELF::EM_SPARCV9:
return Triple::sparcv9;
default:
return Triple::UnknownArch;
}
}
/// FIXME: Maybe we should have a base ElfObjectFile that is not a template
/// and make these member functions?
inline error_code getELFRelocationAddend(const RelocationRef R,
int64_t &Addend) {
const ObjectFile *Obj = R.getObjectFile();
DataRefImpl DRI = R.getRawDataRefImpl();
// Little-endian 32-bit
if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
return ELFObj->getRelocationAddend(DRI, Addend);
// Big-endian 32-bit
if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
return ELFObj->getRelocationAddend(DRI, Addend);
// Little-endian 64-bit
if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
return ELFObj->getRelocationAddend(DRI, Addend);
// Big-endian 64-bit
if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
return ELFObj->getRelocationAddend(DRI, Addend);
llvm_unreachable("Object passed to getELFRelocationAddend() is not ELF");
}
inline std::pair<symbol_iterator, symbol_iterator>
getELFDynamicSymbolIterators(SymbolicFile *Obj) {
if (const ELF32LEObjectFile *ELF = dyn_cast<ELF32LEObjectFile>(Obj))
return std::make_pair(ELF->dynamic_symbol_begin(),
ELF->dynamic_symbol_end());
if (const ELF64LEObjectFile *ELF = dyn_cast<ELF64LEObjectFile>(Obj))
return std::make_pair(ELF->dynamic_symbol_begin(),
ELF->dynamic_symbol_end());
if (const ELF32BEObjectFile *ELF = dyn_cast<ELF32BEObjectFile>(Obj))
return std::make_pair(ELF->dynamic_symbol_begin(),
ELF->dynamic_symbol_end());
if (const ELF64BEObjectFile *ELF = cast<ELF64BEObjectFile>(Obj))
return std::make_pair(ELF->dynamic_symbol_begin(),
ELF->dynamic_symbol_end());
llvm_unreachable(
"Object passed to getELFDynamicSymbolIterators() is not ELF");
}
/// This is a generic interface for retrieving GNU symbol version
/// information from an ELFObjectFile.
inline error_code GetELFSymbolVersion(const ObjectFile *Obj,
const SymbolRef &Sym, StringRef &Version,
bool &IsDefault) {
// Little-endian 32-bit
if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
return ELFObj->getSymbolVersion(Sym, Version, IsDefault);
// Big-endian 32-bit
if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
return ELFObj->getSymbolVersion(Sym, Version, IsDefault);
// Little-endian 64-bit
if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
return ELFObj->getSymbolVersion(Sym, Version, IsDefault);
// Big-endian 64-bit
if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
return ELFObj->getSymbolVersion(Sym, Version, IsDefault);
llvm_unreachable("Object passed to GetELFSymbolVersion() is not ELF");
}
}
}
#endif
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