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Diffstat (limited to 'include/llvm/Object/ELFObjectFile.h')
| -rw-r--r-- | include/llvm/Object/ELFObjectFile.h | 1027 |
1 files changed, 1027 insertions, 0 deletions
diff --git a/include/llvm/Object/ELFObjectFile.h b/include/llvm/Object/ELFObjectFile.h new file mode 100644 index 0000000..962a3e2 --- /dev/null +++ b/include/llvm/Object/ELFObjectFile.h @@ -0,0 +1,1027 @@ +//===- 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; + + virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const; + virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const; + virtual error_code getSymbolFileOffset(DataRefImpl Symb, uint64_t &Res) const; + virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const; + virtual error_code getSymbolAlignment(DataRefImpl Symb, uint32_t &Res) const; + virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const; + virtual error_code getSymbolFlags(DataRefImpl Symb, uint32_t &Res) const; + virtual error_code getSymbolType(DataRefImpl Symb, + SymbolRef::Type &Res) const; + virtual error_code getSymbolSection(DataRefImpl Symb, + section_iterator &Res) const; + virtual error_code getSymbolValue(DataRefImpl Symb, uint64_t &Val) const; + + virtual error_code getLibraryNext(DataRefImpl Data, LibraryRef &Result) const; + virtual error_code getLibraryPath(DataRefImpl Data, StringRef &Res) const; + + virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const; + virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const; + virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const; + virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const; + virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const; + virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const; + virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionRequiredForExecution(DataRefImpl Sec, + bool &Res) const; + virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const; + virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const; + virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb, + bool &Result) const; + virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const; + virtual relocation_iterator section_rel_end(DataRefImpl Sec) const; + virtual section_iterator getRelocatedSection(DataRefImpl Sec) const; + + virtual error_code getRelocationNext(DataRefImpl Rel, + RelocationRef &Res) const; + virtual error_code getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const; + virtual error_code getRelocationOffset(DataRefImpl Rel, uint64_t &Res) const; + virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const; + virtual error_code getRelocationType(DataRefImpl Rel, uint64_t &Res) const; + virtual error_code getRelocationTypeName(DataRefImpl Rel, + SmallVectorImpl<char> &Result) const; + virtual error_code + getRelocationValueString(DataRefImpl Rel, + SmallVectorImpl<char> &Result) const; + + 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); + + const Elf_Sym *getSymbol(DataRefImpl Symb) const; + + virtual symbol_iterator begin_symbols() const; + virtual symbol_iterator end_symbols() const; + + virtual symbol_iterator begin_dynamic_symbols() const; + virtual symbol_iterator end_dynamic_symbols() const; + + virtual section_iterator begin_sections() const; + virtual section_iterator end_sections() const; + + virtual library_iterator begin_libraries_needed() const; + virtual library_iterator end_libraries_needed() const; + + error_code getRelocationAddend(DataRefImpl Rel, int64_t &Res) const; + error_code getSymbolVersion(SymbolRef Symb, StringRef &Version, + bool &IsDefault) const; + + virtual uint8_t getBytesInAddress() const; + virtual StringRef getFileFormatName() const; + virtual StringRef getObjectType() const { return "ELF"; } + virtual unsigned getArch() const; + virtual StringRef getLoadName() const; + + 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> +error_code ELFObjectFile<ELFT>::getSymbolNext(DataRefImpl Symb, + SymbolRef &Result) const { + Result = SymbolRef(toDRI(++toELFSymIter(Symb)), this); + return object_error::success; +} + +template <class ELFT> +error_code ELFObjectFile<ELFT>::getSymbolName(DataRefImpl Symb, + StringRef &Result) const { + ErrorOr<StringRef> Name = EF.getSymbolName(toELFSymIter(Symb)); + if (!Name) + return Name; + 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; + 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: + 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> +error_code ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Symb, + uint32_t &Result) const { + const Elf_Sym *ESym = getSymbol(Symb); + + 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.begin_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; + + if (ESym->getType() == ELF::STT_TLS) + Result |= SymbolRef::SF_ThreadLocal; + + return object_error::success; +} + +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 = end_sections(); + 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); + Val = ESym->st_value; + return object_error::success; +} + +template <class ELFT> +error_code ELFObjectFile<ELFT>::getSectionNext(DataRefImpl Sec, + SectionRef &Result) const { + Result = SectionRef(toDRI(++toELFShdrIter(Sec)), this); + return object_error::success; +} + +template <class ELFT> +error_code ELFObjectFile<ELFT>::getSectionName(DataRefImpl Sec, + StringRef &Result) const { + ErrorOr<StringRef> Name = EF.getSectionName(&*toELFShdrIter(Sec)); + if (!Name) + return Name; + 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 end_sections(); + + Elf_Shdr_Iter EShdr = toELFShdrIter(Sec); + uintX_t Type = EShdr->sh_type; + if (Type != ELF::SHT_REL && Type != ELF::SHT_RELA) + return end_sections(); + + const Elf_Shdr *R = EF.getSection(EShdr->sh_info); + return section_iterator(SectionRef(toDRI(R), this)); +} + +// Relocations +template <class ELFT> +error_code ELFObjectFile<ELFT>::getRelocationNext(DataRefImpl Rel, + RelocationRef &Result) const { + ++Rel.d.b; + Result = RelocationRef(Rel, this); + return object_error::success; +} + +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 end_symbols(); + + 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 { + Result = getROffset(Rel); + return object_error::success; +} + +template <class ELFT> +error_code ELFObjectFile<ELFT>::getRelocationOffset(DataRefImpl Rel, + uint64_t &Result) const { + 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; + 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: + 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) + : ObjectFile(getELFType(static_cast<endianness>(ELFT::TargetEndianness) == + support::little, + ELFT::Is64Bits), + Object), + EF(Object, ec) {} + +template <class ELFT> +symbol_iterator ELFObjectFile<ELFT>::begin_symbols() const { + return symbol_iterator(SymbolRef(toDRI(EF.begin_symbols()), this)); +} + +template <class ELFT> +symbol_iterator ELFObjectFile<ELFT>::end_symbols() const { + return symbol_iterator(SymbolRef(toDRI(EF.end_symbols()), this)); +} + +template <class ELFT> +symbol_iterator ELFObjectFile<ELFT>::begin_dynamic_symbols() const { + return symbol_iterator(SymbolRef(toDRI(EF.begin_dynamic_symbols()), this)); +} + +template <class ELFT> +symbol_iterator ELFObjectFile<ELFT>::end_dynamic_symbols() const { + return symbol_iterator(SymbolRef(toDRI(EF.end_dynamic_symbols()), this)); +} + +template <class ELFT> +section_iterator ELFObjectFile<ELFT>::begin_sections() const { + return section_iterator(SectionRef(toDRI(EF.begin_sections()), this)); +} + +template <class ELFT> +section_iterator ELFObjectFile<ELFT>::end_sections() 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>::begin_libraries_needed() 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>::end_libraries_needed() 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"; + 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"; + 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; + default: + return Triple::UnknownArch; + } +} + +/// FIXME: Maybe we should have a base ElfObjectFile that is not a template +/// and make these member functions? +static 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"); +} + +/// This is a generic interface for retrieving GNU symbol version +/// information from an ELFObjectFile. +static 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 |