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llvm-6502/include/llvm/Object/ELFObjectFile.h
Rafael Espindola 7df9059541 Implement getRelocationAddress for MachO and ET_REL elf files. 
With that, fix the symbolizer to work with any ELF file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205588 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-03 23:54:35 +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_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_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 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 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;
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>::getSymbolAddress(DataRefImpl Symb,
uint64_t &Result) const {
const Elf_Sym *ESym = getSymbol(Symb);
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:
break;
}
const Elf_Ehdr *Header = EF.getHeader();
Result = ESym->st_value;
// Clear the ARM/Thumb indicator flag.
if (Header->e_machine == ELF::EM_ARM && ESym->getType() == ELF::STT_FUNC)
Result &= ~1;
if (Header->e_type == ELF::ET_REL)
Result += EF.getSection(ESym)->sh_addr;
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>
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>
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 {
uint64_t ROffset = getROffset(Rel);
const Elf_Ehdr *Header = EF.getHeader();
if (Header->e_type == ELF::ET_REL) {
const Elf_Shdr *RelocationSec = getRelSection(Rel);
const Elf_Shdr *RelocatedSec = EF.getSection(RelocationSec->sh_info);
Result = ROffset + RelocatedSec->sh_addr;
} else {
Result = ROffset;
}
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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