#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/IntervalMap.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringSwitch.h"
// Subclasses of ELFFile may need this for template instantiation
inline std::pair<unsigned char, unsigned char>
-getElfArchType(MemoryBuffer *Object) {
- if (Object->getBufferSize() < ELF::EI_NIDENT)
- return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE);
- return std::make_pair((uint8_t) Object->getBufferStart()[ELF::EI_CLASS],
- (uint8_t) Object->getBufferStart()[ELF::EI_DATA]);
+getElfArchType(StringRef Object) {
+ if (Object.size() < ELF::EI_NIDENT)
+ return std::make_pair((uint8_t)ELF::ELFCLASSNONE,
+ (uint8_t)ELF::ELFDATANONE);
+ return std::make_pair((uint8_t)Object[ELF::EI_CLASS],
+ (uint8_t)Object[ELF::EI_DATA]);
}
template <class ELFT>
return *this;
}
+ ELFEntityIterator &operator+(difference_type n) {
+ assert(Current && "Attempted to increment an invalid iterator!");
+ Current += (n * EntitySize);
+ return *this;
+ }
+
+ ELFEntityIterator &operator-(difference_type n) {
+ assert(Current && "Attempted to subtract an invalid iterator!");
+ Current -= (n * EntitySize);
+ return *this;
+ }
+
ELFEntityIterator operator ++(int) {
ELFEntityIterator Tmp = *this;
++*this;
return Tmp;
}
- ELFEntityIterator &operator =(const ELFEntityIterator &Other) {
- EntitySize = Other.EntitySize;
- Current = Other.Current;
- return *this;
- }
-
difference_type operator -(const ELFEntityIterator &Other) const {
assert(EntitySize == Other.EntitySize &&
"Subtracting iterators of different EntitySize!");
typedef Elf_Verneed_Impl<ELFT> Elf_Verneed;
typedef Elf_Vernaux_Impl<ELFT> Elf_Vernaux;
typedef Elf_Versym_Impl<ELFT> Elf_Versym;
+ typedef Elf_Hash_Impl<ELFT> Elf_Hash;
typedef ELFEntityIterator<const Elf_Dyn> Elf_Dyn_Iter;
+ typedef iterator_range<Elf_Dyn_Iter> Elf_Dyn_Range;
typedef ELFEntityIterator<const Elf_Rela> Elf_Rela_Iter;
typedef ELFEntityIterator<const Elf_Rel> Elf_Rel_Iter;
- typedef ELFEntityIterator<const Elf_Shdr> Elf_Shdr_Iter;
+ typedef iterator_range<const Elf_Shdr *> Elf_Shdr_Range;
/// \brief Archive files are 2 byte aligned, so we need this for
/// PointerIntPair to work.
enum { NumLowBitsAvailable = 1 };
};
- class Elf_Sym_Iter {
- public:
- typedef ptrdiff_t difference_type;
- typedef const Elf_Sym value_type;
- typedef std::random_access_iterator_tag iterator_category;
- typedef value_type &reference;
- typedef value_type *pointer;
-
- /// \brief Default construct iterator.
- Elf_Sym_Iter() : EntitySize(0), Current(0, false) {}
- Elf_Sym_Iter(uintX_t EntSize, const char *Start, bool IsDynamic)
- : EntitySize(EntSize), Current(Start, IsDynamic) {}
-
- reference operator*() {
- assert(Current.getPointer() &&
- "Attempted to dereference an invalid iterator!");
- return *reinterpret_cast<pointer>(Current.getPointer());
- }
-
- pointer operator->() {
- assert(Current.getPointer() &&
- "Attempted to dereference an invalid iterator!");
- return reinterpret_cast<pointer>(Current.getPointer());
- }
-
- bool operator==(const Elf_Sym_Iter &Other) {
- return Current == Other.Current;
- }
-
- bool operator!=(const Elf_Sym_Iter &Other) { return !(*this == Other); }
-
- Elf_Sym_Iter &operator++() {
- assert(Current.getPointer() &&
- "Attempted to increment an invalid iterator!");
- Current.setPointer(Current.getPointer() + EntitySize);
- return *this;
- }
-
- Elf_Sym_Iter operator++(int) {
- Elf_Sym_Iter Tmp = *this;
- ++*this;
- return Tmp;
- }
-
- Elf_Sym_Iter operator+(difference_type Dist) {
- assert(Current.getPointer() &&
- "Attempted to increment an invalid iterator!");
- Current.setPointer(Current.getPointer() + EntitySize * Dist);
- return *this;
- }
-
- Elf_Sym_Iter &operator=(const Elf_Sym_Iter &Other) {
- EntitySize = Other.EntitySize;
- Current = Other.Current;
- return *this;
- }
-
- difference_type operator-(const Elf_Sym_Iter &Other) const {
- assert(EntitySize == Other.EntitySize &&
- "Subtracting iterators of different EntitySize!");
- return (Current.getPointer() - Other.Current.getPointer()) / EntitySize;
- }
-
- const char *get() const { return Current.getPointer(); }
-
- bool isDynamic() const { return Current.getInt(); }
-
- uintX_t getEntSize() const { return EntitySize; }
-
- private:
- uintX_t EntitySize;
- PointerIntPair<const char *, 1, bool,
- ArchivePointerTypeTraits<const char> > Current;
- };
+ typedef iterator_range<const Elf_Sym *> Elf_Sym_Range;
private:
typedef SmallVector<const Elf_Shdr *, 2> Sections_t;
typedef DenseMap<unsigned, unsigned> IndexMap_t;
- MemoryBuffer *Buf;
+ StringRef Buf;
const uint8_t *base() const {
- return reinterpret_cast<const uint8_t *>(Buf->getBufferStart());
+ return reinterpret_cast<const uint8_t *>(Buf.data());
}
const Elf_Ehdr *Header;
- const Elf_Shdr *SectionHeaderTable;
- const Elf_Shdr *dot_shstrtab_sec; // Section header string table.
- const Elf_Shdr *dot_strtab_sec; // Symbol header string table.
- const Elf_Shdr *dot_symtab_sec; // Symbol table section.
-
- const Elf_Shdr *SymbolTableSectionHeaderIndex;
+ const Elf_Shdr *SectionHeaderTable = nullptr;
+ StringRef DotShstrtab; // Section header string table.
+ StringRef DotStrtab; // Symbol header string table.
+ const Elf_Shdr *dot_symtab_sec = nullptr; // Symbol table section.
+ StringRef DynSymStrTab; // Dynnamic symbol string table.
+ const Elf_Shdr *DotDynSymSec = nullptr; // Dynamic symbol table section.
+ const Elf_Hash *HashTable = nullptr;
+
+ const Elf_Shdr *SymbolTableSectionHeaderIndex = nullptr;
DenseMap<const Elf_Sym *, ELF::Elf64_Word> ExtendedSymbolTable;
- const Elf_Shdr *dot_gnu_version_sec; // .gnu.version
- const Elf_Shdr *dot_gnu_version_r_sec; // .gnu.version_r
- const Elf_Shdr *dot_gnu_version_d_sec; // .gnu.version_d
+ const Elf_Shdr *dot_gnu_version_sec = nullptr; // .gnu.version
+ const Elf_Shdr *dot_gnu_version_r_sec = nullptr; // .gnu.version_r
+ const Elf_Shdr *dot_gnu_version_d_sec = nullptr; // .gnu.version_d
/// \brief Represents a region described by entries in the .dynamic table.
struct DynRegionInfo {
DynRegionInfo DynamicRegion;
DynRegionInfo DynHashRegion;
- DynRegionInfo DynStrRegion;
- DynRegionInfo DynSymRegion;
+ DynRegionInfo DynRelaRegion;
// Pointer to SONAME entry in dynamic string table
// This is set the first time getLoadName is called.
- mutable const char *dt_soname;
+ mutable const char *dt_soname = nullptr;
// Records for each version index the corresponding Verdef or Vernaux entry.
// This is filled the first time LoadVersionMap() is called.
void LoadVersionNeeds(const Elf_Shdr *ec) const;
void LoadVersionMap() const;
+ void scanDynamicTable();
+
public:
template<typename T>
const T *getEntry(uint32_t Section, uint32_t Entry) const;
template <typename T>
const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const;
- const char *getString(uint32_t section, uint32_t offset) const;
- const char *getString(const Elf_Shdr *section, uint32_t offset) const;
+
+ const Elf_Shdr *getDotSymtabSec() const { return dot_symtab_sec; }
+ const Elf_Shdr *getDotDynSymSec() const { return DotDynSymSec; }
+ const Elf_Hash *getHashTable() const { return HashTable; }
+
+ ErrorOr<StringRef> getStringTable(const Elf_Shdr *Section) const;
const char *getDynamicString(uintX_t Offset) const;
ErrorOr<StringRef> getSymbolVersion(const Elf_Shdr *section,
const Elf_Sym *Symb,
std::pair<const Elf_Shdr *, const Elf_Sym *>
getRelocationSymbol(const Elf_Shdr *RelSec, const RelT *Rel) const;
- ELFFile(MemoryBuffer *Object, error_code &ec);
+ ELFFile(StringRef Object, std::error_code &EC);
+
+ bool isMipsELF64() const {
+ return Header->e_machine == ELF::EM_MIPS &&
+ Header->getFileClass() == ELF::ELFCLASS64;
+ }
bool isMips64EL() const {
return Header->e_machine == ELF::EM_MIPS &&
Header->getDataEncoding() == ELF::ELFDATA2LSB;
}
- Elf_Shdr_Iter begin_sections() const;
- Elf_Shdr_Iter end_sections() const;
+ const Elf_Shdr *section_begin() const;
+ const Elf_Shdr *section_end() const;
+ Elf_Shdr_Range sections() const {
+ return make_range(section_begin(), section_end());
+ }
- Elf_Sym_Iter begin_symbols() const;
- Elf_Sym_Iter end_symbols() const;
+ const Elf_Sym *symbol_begin() const;
+ const Elf_Sym *symbol_end() const;
+ Elf_Sym_Range symbols() const {
+ return make_range(symbol_begin(), symbol_end());
+ }
- Elf_Dyn_Iter begin_dynamic_table() const;
+ Elf_Dyn_Iter dynamic_table_begin() const;
/// \param NULLEnd use one past the first DT_NULL entry as the end instead of
/// the section size.
- Elf_Dyn_Iter end_dynamic_table(bool NULLEnd = false) const;
+ Elf_Dyn_Iter dynamic_table_end(bool NULLEnd = false) const;
+ Elf_Dyn_Range dynamic_table(bool NULLEnd = false) const {
+ return make_range(dynamic_table_begin(), dynamic_table_end(NULLEnd));
+ }
- Elf_Sym_Iter begin_dynamic_symbols() const {
- if (DynSymRegion.Addr)
- return Elf_Sym_Iter(DynSymRegion.EntSize, (const char *)DynSymRegion.Addr,
- true);
- return Elf_Sym_Iter(0, nullptr, true);
+ const Elf_Sym *dynamic_symbol_begin() const {
+ if (!DotDynSymSec)
+ return nullptr;
+ if (DotDynSymSec->sh_entsize != sizeof(Elf_Sym))
+ report_fatal_error("Invalid symbol size");
+ return reinterpret_cast<const Elf_Sym *>(base() + DotDynSymSec->sh_offset);
}
- Elf_Sym_Iter end_dynamic_symbols() const {
- if (DynSymRegion.Addr)
- return Elf_Sym_Iter(DynSymRegion.EntSize,
- (const char *)DynSymRegion.Addr + DynSymRegion.Size,
- true);
- return Elf_Sym_Iter(0, nullptr, true);
+ const Elf_Sym *dynamic_symbol_end() const {
+ if (!DotDynSymSec)
+ return nullptr;
+ return reinterpret_cast<const Elf_Sym *>(base() + DotDynSymSec->sh_offset +
+ DotDynSymSec->sh_size);
}
- Elf_Rela_Iter begin_rela(const Elf_Shdr *sec) const {
+ Elf_Sym_Range dynamic_symbols() const {
+ return make_range(dynamic_symbol_begin(), dynamic_symbol_end());
+ }
+
+ Elf_Rela_Iter dyn_rela_begin() const {
+ if (DynRelaRegion.Addr)
+ return Elf_Rela_Iter(DynRelaRegion.EntSize,
+ (const char *)DynRelaRegion.Addr);
+ return Elf_Rela_Iter(0, nullptr);
+ }
+
+ Elf_Rela_Iter dyn_rela_end() const {
+ if (DynRelaRegion.Addr)
+ return Elf_Rela_Iter(
+ DynRelaRegion.EntSize,
+ (const char *)DynRelaRegion.Addr + DynRelaRegion.Size);
+ return Elf_Rela_Iter(0, nullptr);
+ }
+
+ Elf_Rela_Iter rela_begin(const Elf_Shdr *sec) const {
return Elf_Rela_Iter(sec->sh_entsize,
(const char *)(base() + sec->sh_offset));
}
- Elf_Rela_Iter end_rela(const Elf_Shdr *sec) const {
+ Elf_Rela_Iter rela_end(const Elf_Shdr *sec) const {
return Elf_Rela_Iter(
sec->sh_entsize,
(const char *)(base() + sec->sh_offset + sec->sh_size));
}
- Elf_Rel_Iter begin_rel(const Elf_Shdr *sec) const {
+ Elf_Rel_Iter rel_begin(const Elf_Shdr *sec) const {
return Elf_Rel_Iter(sec->sh_entsize,
(const char *)(base() + sec->sh_offset));
}
- Elf_Rel_Iter end_rel(const Elf_Shdr *sec) const {
+ Elf_Rel_Iter rel_end(const Elf_Shdr *sec) const {
return Elf_Rel_Iter(sec->sh_entsize,
(const char *)(base() + sec->sh_offset + sec->sh_size));
}
/// \brief Iterate over program header table.
typedef ELFEntityIterator<const Elf_Phdr> Elf_Phdr_Iter;
- Elf_Phdr_Iter begin_program_headers() const {
+ Elf_Phdr_Iter program_header_begin() const {
return Elf_Phdr_Iter(Header->e_phentsize,
(const char*)base() + Header->e_phoff);
}
- Elf_Phdr_Iter end_program_headers() const {
+ Elf_Phdr_Iter program_header_end() const {
return Elf_Phdr_Iter(Header->e_phentsize,
(const char*)base() +
Header->e_phoff +
uint64_t getNumSections() const;
uintX_t getStringTableIndex() const;
- ELF::Elf64_Word getSymbolTableIndex(const Elf_Sym *symb) const;
+ ELF::Elf64_Word getExtendedSymbolTableIndex(const Elf_Sym *symb) const;
const Elf_Ehdr *getHeader() const { return Header; }
- const Elf_Shdr *getSection(const Elf_Sym *symb) const;
- const Elf_Shdr *getSection(uint32_t Index) const;
+ ErrorOr<const Elf_Shdr *> getSection(const Elf_Sym *symb) const;
+ ErrorOr<const Elf_Shdr *> getSection(uint32_t Index) const;
const Elf_Sym *getSymbol(uint32_t index) const;
- ErrorOr<StringRef> getSymbolName(Elf_Sym_Iter Sym) const;
+ ErrorOr<StringRef> getStaticSymbolName(const Elf_Sym *Symb) const;
+ ErrorOr<StringRef> getDynamicSymbolName(const Elf_Sym *Symb) const;
+ ErrorOr<StringRef> getSymbolName(const Elf_Sym *Symb, bool IsDynamic) const;
- /// \brief Get the name of \p Symb.
- /// \param SymTab The symbol table section \p Symb is contained in.
- /// \param Symb The symbol to get the name of.
- ///
- /// \p SymTab is used to lookup the string table to use to get the symbol's
- /// name.
- ErrorOr<StringRef> getSymbolName(const Elf_Shdr *SymTab,
- const Elf_Sym *Symb) const;
ErrorOr<StringRef> getSectionName(const Elf_Shdr *Section) const;
- uint64_t getSymbolIndex(const Elf_Sym *sym) const;
ErrorOr<ArrayRef<uint8_t> > getSectionContents(const Elf_Shdr *Sec) const;
StringRef getLoadName() const;
};
-// Use an alignment of 2 for the typedefs since that is the worst case for
-// ELF files in archives.
-typedef ELFFile<ELFType<support::little, 2, false> > ELF32LEFile;
-typedef ELFFile<ELFType<support::little, 2, true> > ELF64LEFile;
-typedef ELFFile<ELFType<support::big, 2, false> > ELF32BEFile;
-typedef ELFFile<ELFType<support::big, 2, true> > ELF64BEFile;
+typedef ELFFile<ELFType<support::little, false>> ELF32LEFile;
+typedef ELFFile<ELFType<support::little, true>> ELF64LEFile;
+typedef ELFFile<ELFType<support::big, false>> ELF32BEFile;
+typedef ELFFile<ELFType<support::big, true>> ELF64BEFile;
// Iterate through the version definitions, and place each Elf_Verdef
// in the VersionMap according to its index.
template <class ELFT>
void ELFFile<ELFT>::LoadVersionMap() const {
// If there is no dynamic symtab or version table, there is nothing to do.
- if (!DynSymRegion.Addr || !dot_gnu_version_sec)
+ if (!DotDynSymSec || !dot_gnu_version_sec)
return;
// Has the VersionMap already been loaded?
}
template <class ELFT>
-ELF::Elf64_Word ELFFile<ELFT>::getSymbolTableIndex(const Elf_Sym *symb) const {
- if (symb->st_shndx == ELF::SHN_XINDEX)
- return ExtendedSymbolTable.lookup(symb);
- return symb->st_shndx;
+ELF::Elf64_Word
+ELFFile<ELFT>::getExtendedSymbolTableIndex(const Elf_Sym *symb) const {
+ assert(symb->st_shndx == ELF::SHN_XINDEX);
+ return ExtendedSymbolTable.lookup(symb);
}
template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Shdr *
+ErrorOr<const typename ELFFile<ELFT>::Elf_Shdr *>
ELFFile<ELFT>::getSection(const Elf_Sym *symb) const {
- if (symb->st_shndx == ELF::SHN_XINDEX)
+ uint32_t Index = symb->st_shndx;
+ if (Index == ELF::SHN_XINDEX)
return getSection(ExtendedSymbolTable.lookup(symb));
- if (symb->st_shndx >= ELF::SHN_LORESERVE)
+ if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
return nullptr;
return getSection(symb->st_shndx);
}
template <class ELFT>
const typename ELFFile<ELFT>::Elf_Sym *
ELFFile<ELFT>::getSymbol(uint32_t Index) const {
- return &*(begin_symbols() + Index);
+ return &*(symbol_begin() + Index);
}
template <class ELFT>
ErrorOr<ArrayRef<uint8_t> >
ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
- if (Sec->sh_offset + Sec->sh_size > Buf->getBufferSize())
+ if (Sec->sh_offset + Sec->sh_size > Buf.size())
return object_error::parse_failed;
const uint8_t *Start = base() + Sec->sh_offset;
- return ArrayRef<uint8_t>(Start, Sec->sh_size);
+ return makeArrayRef(Start, Sec->sh_size);
}
template <class ELFT>
template <class ELFT>
void ELFFile<ELFT>::getRelocationTypeName(uint32_t Type,
SmallVectorImpl<char> &Result) const {
- if (!isMips64EL()) {
+ if (!isMipsELF64()) {
StringRef Name = getRelocationTypeName(Type);
Result.append(Name.begin(), Name.end());
} else {
+ // The Mips N64 ABI allows up to three operations to be specified per
+ // relocation record. Unfortunately there's no easy way to test for the
+ // presence of N64 ELFs as they have no special flag that identifies them
+ // as being N64. We can safely assume at the moment that all Mips
+ // ELFCLASS64 ELFs are N64. New Mips64 ABIs should provide enough
+ // information to disambiguate between old vs new ABIs.
uint8_t Type1 = (Type >> 0) & 0xFF;
uint8_t Type2 = (Type >> 8) & 0xFF;
uint8_t Type3 = (Type >> 16) & 0xFF;
const typename ELFFile<ELFT>::Elf_Sym *>
ELFFile<ELFT>::getRelocationSymbol(const Elf_Shdr *Sec, const RelT *Rel) const {
if (!Sec->sh_link)
- return std::make_pair((const Elf_Shdr *)0, (const Elf_Sym *)0);
- const Elf_Shdr *SymTable = getSection(Sec->sh_link);
+ return std::make_pair(nullptr, nullptr);
+ ErrorOr<const Elf_Shdr *> SymTableOrErr = getSection(Sec->sh_link);
+ if (std::error_code EC = SymTableOrErr.getError())
+ report_fatal_error(EC.message());
+ const Elf_Shdr *SymTable = *SymTableOrErr;
return std::make_pair(
SymTable, getEntry<Elf_Sym>(SymTable, Rel->getSymbol(isMips64EL())));
}
-// Verify that the last byte in the string table in a null.
-template <class ELFT>
-void ELFFile<ELFT>::VerifyStrTab(const Elf_Shdr *sh) const {
- const char *strtab = (const char *)base() + sh->sh_offset;
- if (strtab[sh->sh_size - 1] != 0)
- // FIXME: Proper error handling.
- report_fatal_error("String table must end with a null terminator!");
-}
-
template <class ELFT>
uint64_t ELFFile<ELFT>::getNumSections() const {
assert(Header && "Header not initialized!");
- if (Header->e_shnum == ELF::SHN_UNDEF) {
+ if (Header->e_shnum == ELF::SHN_UNDEF && Header->e_shoff > 0) {
assert(SectionHeaderTable && "SectionHeaderTable not initialized!");
return SectionHeaderTable->sh_size;
}
}
template <class ELFT>
-ELFFile<ELFT>::ELFFile(MemoryBuffer *Object, error_code &ec)
- : Buf(Object),
- SectionHeaderTable(nullptr),
- dot_shstrtab_sec(nullptr),
- dot_strtab_sec(nullptr),
- dot_symtab_sec(nullptr),
- SymbolTableSectionHeaderIndex(nullptr),
- dot_gnu_version_sec(nullptr),
- dot_gnu_version_r_sec(nullptr),
- dot_gnu_version_d_sec(nullptr),
- dt_soname(nullptr) {
- const uint64_t FileSize = Buf->getBufferSize();
+ELFFile<ELFT>::ELFFile(StringRef Object, std::error_code &EC)
+ : Buf(Object) {
+ const uint64_t FileSize = Buf.size();
- if (sizeof(Elf_Ehdr) > FileSize)
- // FIXME: Proper error handling.
- report_fatal_error("File too short!");
+ if (sizeof(Elf_Ehdr) > FileSize) {
+ // File too short!
+ EC = object_error::parse_failed;
+ return;
+ }
Header = reinterpret_cast<const Elf_Ehdr *>(base());
- if (Header->e_shoff == 0)
+ if (Header->e_shoff == 0) {
+ scanDynamicTable();
return;
+ }
const uint64_t SectionTableOffset = Header->e_shoff;
- if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize)
- // FIXME: Proper error handling.
- report_fatal_error("Section header table goes past end of file!");
+ if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize) {
+ // Section header table goes past end of file!
+ EC = object_error::parse_failed;
+ return;
+ }
// The getNumSections() call below depends on SectionHeaderTable being set.
SectionHeaderTable =
reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset);
const uint64_t SectionTableSize = getNumSections() * Header->e_shentsize;
- if (SectionTableOffset + SectionTableSize > FileSize)
- // FIXME: Proper error handling.
- report_fatal_error("Section table goes past end of file!");
+ if (SectionTableOffset + SectionTableSize > FileSize) {
+ // Section table goes past end of file!
+ EC = object_error::parse_failed;
+ return;
+ }
// Scan sections for special sections.
- for (Elf_Shdr_Iter SecI = begin_sections(), SecE = end_sections();
- SecI != SecE; ++SecI) {
- switch (SecI->sh_type) {
- case ELF::SHT_SYMTAB_SHNDX:
- if (SymbolTableSectionHeaderIndex)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .symtab_shndx!");
- SymbolTableSectionHeaderIndex = &*SecI;
+ for (const Elf_Shdr &Sec : sections()) {
+ switch (Sec.sh_type) {
+ case ELF::SHT_HASH:
+ if (HashTable) {
+ EC = object_error::parse_failed;
+ return;
+ }
+ HashTable = reinterpret_cast<const Elf_Hash *>(base() + Sec.sh_offset);
break;
- case ELF::SHT_SYMTAB:
- if (dot_symtab_sec)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .symtab!");
- dot_symtab_sec = &*SecI;
- dot_strtab_sec = getSection(SecI->sh_link);
+ case ELF::SHT_SYMTAB_SHNDX:
+ if (SymbolTableSectionHeaderIndex) {
+ // More than one .symtab_shndx!
+ EC = object_error::parse_failed;
+ return;
+ }
+ SymbolTableSectionHeaderIndex = &Sec;
break;
+ case ELF::SHT_SYMTAB: {
+ if (dot_symtab_sec) {
+ // More than one .symtab!
+ EC = object_error::parse_failed;
+ return;
+ }
+ dot_symtab_sec = &Sec;
+ ErrorOr<const Elf_Shdr *> SectionOrErr = getSection(Sec.sh_link);
+ if ((EC = SectionOrErr.getError()))
+ return;
+ ErrorOr<StringRef> SymtabOrErr = getStringTable(*SectionOrErr);
+ if ((EC = SymtabOrErr.getError()))
+ return;
+ DotStrtab = *SymtabOrErr;
+ } break;
case ELF::SHT_DYNSYM: {
- if (DynSymRegion.Addr)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .dynsym!");
- DynSymRegion.Addr = base() + SecI->sh_offset;
- DynSymRegion.Size = SecI->sh_size;
- DynSymRegion.EntSize = SecI->sh_entsize;
- const Elf_Shdr *DynStr = getSection(SecI->sh_link);
- DynStrRegion.Addr = base() + DynStr->sh_offset;
- DynStrRegion.Size = DynStr->sh_size;
- DynStrRegion.EntSize = DynStr->sh_entsize;
+ if (DotDynSymSec) {
+ // More than one .dynsym!
+ EC = object_error::parse_failed;
+ return;
+ }
+ DotDynSymSec = &Sec;
+ ErrorOr<const Elf_Shdr *> SectionOrErr = getSection(Sec.sh_link);
+ if ((EC = SectionOrErr.getError()))
+ return;
+ ErrorOr<StringRef> SymtabOrErr = getStringTable(*SectionOrErr);
+ if ((EC = SymtabOrErr.getError()))
+ return;
+ DynSymStrTab = *SymtabOrErr;
break;
}
case ELF::SHT_DYNAMIC:
- if (DynamicRegion.Addr)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .dynamic!");
- DynamicRegion.Addr = base() + SecI->sh_offset;
- DynamicRegion.Size = SecI->sh_size;
- DynamicRegion.EntSize = SecI->sh_entsize;
+ if (DynamicRegion.Addr) {
+ // More than one .dynamic!
+ EC = object_error::parse_failed;
+ return;
+ }
+ DynamicRegion.Addr = base() + Sec.sh_offset;
+ DynamicRegion.Size = Sec.sh_size;
+ DynamicRegion.EntSize = Sec.sh_entsize;
break;
case ELF::SHT_GNU_versym:
- if (dot_gnu_version_sec != nullptr)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .gnu.version section!");
- dot_gnu_version_sec = &*SecI;
+ if (dot_gnu_version_sec != nullptr) {
+ // More than one .gnu.version section!
+ EC = object_error::parse_failed;
+ return;
+ }
+ dot_gnu_version_sec = &Sec;
break;
case ELF::SHT_GNU_verdef:
- if (dot_gnu_version_d_sec != nullptr)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .gnu.version_d section!");
- dot_gnu_version_d_sec = &*SecI;
+ if (dot_gnu_version_d_sec != nullptr) {
+ // More than one .gnu.version_d section!
+ EC = object_error::parse_failed;
+ return;
+ }
+ dot_gnu_version_d_sec = &Sec;
break;
case ELF::SHT_GNU_verneed:
- if (dot_gnu_version_r_sec != nullptr)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .gnu.version_r section!");
- dot_gnu_version_r_sec = &*SecI;
+ if (dot_gnu_version_r_sec != nullptr) {
+ // More than one .gnu.version_r section!
+ EC = object_error::parse_failed;
+ return;
+ }
+ dot_gnu_version_r_sec = &Sec;
break;
}
}
// Get string table sections.
- dot_shstrtab_sec = getSection(getStringTableIndex());
- if (dot_shstrtab_sec) {
- // Verify that the last byte in the string table in a null.
- VerifyStrTab(dot_shstrtab_sec);
- }
+ ErrorOr<const Elf_Shdr *> StrTabSecOrErr = getSection(getStringTableIndex());
+ if ((EC = StrTabSecOrErr.getError()))
+ return;
+
+ ErrorOr<StringRef> SymtabOrErr = getStringTable(*StrTabSecOrErr);
+ if ((EC = SymtabOrErr.getError()))
+ return;
+ DotShstrtab = *SymtabOrErr;
// Build symbol name side-mapping if there is one.
if (SymbolTableSectionHeaderIndex) {
const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() +
SymbolTableSectionHeaderIndex->sh_offset);
- for (Elf_Sym_Iter SI = begin_symbols(), SE = end_symbols(); SI != SE;
- ++SI) {
+ for (const Elf_Sym &S : symbols()) {
if (*ShndxTable != ELF::SHN_UNDEF)
- ExtendedSymbolTable[&*SI] = *ShndxTable;
+ ExtendedSymbolTable[&S] = *ShndxTable;
++ShndxTable;
}
}
- // Scan program headers.
- for (Elf_Phdr_Iter PhdrI = begin_program_headers(),
- PhdrE = end_program_headers();
+ scanDynamicTable();
+
+ EC = std::error_code();
+}
+
+template <class ELFT>
+void ELFFile<ELFT>::scanDynamicTable() {
+ // Build load-address to file-offset map.
+ typedef IntervalMap<
+ uintX_t, uintptr_t,
+ IntervalMapImpl::NodeSizer<uintX_t, uintptr_t>::LeafSize,
+ IntervalMapHalfOpenInfo<uintX_t>> LoadMapT;
+ typename LoadMapT::Allocator Alloc;
+ LoadMapT LoadMap(Alloc);
+
+ for (Elf_Phdr_Iter PhdrI = program_header_begin(),
+ PhdrE = program_header_end();
PhdrI != PhdrE; ++PhdrI) {
if (PhdrI->p_type == ELF::PT_DYNAMIC) {
DynamicRegion.Addr = base() + PhdrI->p_offset;
DynamicRegion.Size = PhdrI->p_filesz;
DynamicRegion.EntSize = sizeof(Elf_Dyn);
- break;
+ continue;
}
+ if (PhdrI->p_type != ELF::PT_LOAD)
+ continue;
+ if (PhdrI->p_filesz == 0)
+ continue;
+ LoadMap.insert(PhdrI->p_vaddr, PhdrI->p_vaddr + PhdrI->p_filesz,
+ PhdrI->p_offset);
}
- ec = error_code::success();
-}
+ auto toMappedAddr = [&](uint64_t VAddr) -> const uint8_t * {
+ auto I = LoadMap.find(VAddr);
+ if (I == LoadMap.end())
+ return nullptr;
+ return this->base() + I.value() + (VAddr - I.start());
+ };
-// Get the symbol table index in the symtab section given a symbol
-template <class ELFT>
-uint64_t ELFFile<ELFT>::getSymbolIndex(const Elf_Sym *Sym) const {
- uintptr_t SymLoc = uintptr_t(Sym);
- uintptr_t SymTabLoc = uintptr_t(base() + dot_symtab_sec->sh_offset);
- assert(SymLoc > SymTabLoc && "Symbol not in symbol table!");
- uint64_t SymOffset = SymLoc - SymTabLoc;
- assert(SymOffset % dot_symtab_sec->sh_entsize == 0 &&
- "Symbol not multiple of symbol size!");
- return SymOffset / dot_symtab_sec->sh_entsize;
+ for (Elf_Dyn_Iter DynI = dynamic_table_begin(), DynE = dynamic_table_end();
+ DynI != DynE; ++DynI) {
+ switch (DynI->d_tag) {
+ case ELF::DT_HASH:
+ if (HashTable)
+ continue;
+ HashTable =
+ reinterpret_cast<const Elf_Hash *>(toMappedAddr(DynI->getPtr()));
+ break;
+ case ELF::DT_RELA:
+ if (!DynRelaRegion.Addr)
+ DynRelaRegion.Addr = toMappedAddr(DynI->getPtr());
+ break;
+ case ELF::DT_RELASZ:
+ DynRelaRegion.Size = DynI->getVal();
+ break;
+ case ELF::DT_RELAENT:
+ DynRelaRegion.EntSize = DynI->getVal();
+ }
+ }
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Shdr_Iter ELFFile<ELFT>::begin_sections() const {
- return Elf_Shdr_Iter(Header->e_shentsize,
- (const char *)base() + Header->e_shoff);
+const typename ELFFile<ELFT>::Elf_Shdr *ELFFile<ELFT>::section_begin() const {
+ if (Header->e_shentsize != sizeof(Elf_Shdr))
+ report_fatal_error(
+ "Invalid section header entry size (e_shentsize) in ELF header");
+ return reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Shdr_Iter ELFFile<ELFT>::end_sections() const {
- return Elf_Shdr_Iter(Header->e_shentsize,
- (const char *)base() + Header->e_shoff +
- (getNumSections() * Header->e_shentsize));
+const typename ELFFile<ELFT>::Elf_Shdr *ELFFile<ELFT>::section_end() const {
+ return section_begin() + getNumSections();
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Sym_Iter ELFFile<ELFT>::begin_symbols() const {
+const typename ELFFile<ELFT>::Elf_Sym *ELFFile<ELFT>::symbol_begin() const {
if (!dot_symtab_sec)
- return Elf_Sym_Iter(0, nullptr, false);
- return Elf_Sym_Iter(dot_symtab_sec->sh_entsize,
- (const char *)base() + dot_symtab_sec->sh_offset, false);
+ return nullptr;
+ if (dot_symtab_sec->sh_entsize != sizeof(Elf_Sym))
+ report_fatal_error("Invalid symbol size");
+ return reinterpret_cast<const Elf_Sym *>(base() + dot_symtab_sec->sh_offset);
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Sym_Iter ELFFile<ELFT>::end_symbols() const {
+const typename ELFFile<ELFT>::Elf_Sym *ELFFile<ELFT>::symbol_end() const {
if (!dot_symtab_sec)
- return Elf_Sym_Iter(0, nullptr, false);
- return Elf_Sym_Iter(dot_symtab_sec->sh_entsize,
- (const char *)base() + dot_symtab_sec->sh_offset +
- dot_symtab_sec->sh_size,
- false);
+ return nullptr;
+ return reinterpret_cast<const Elf_Sym *>(base() + dot_symtab_sec->sh_offset +
+ dot_symtab_sec->sh_size);
}
template <class ELFT>
typename ELFFile<ELFT>::Elf_Dyn_Iter
-ELFFile<ELFT>::begin_dynamic_table() const {
+ELFFile<ELFT>::dynamic_table_begin() const {
if (DynamicRegion.Addr)
return Elf_Dyn_Iter(DynamicRegion.EntSize,
(const char *)DynamicRegion.Addr);
template <class ELFT>
typename ELFFile<ELFT>::Elf_Dyn_Iter
-ELFFile<ELFT>::end_dynamic_table(bool NULLEnd) const {
+ELFFile<ELFT>::dynamic_table_end(bool NULLEnd) const {
if (!DynamicRegion.Addr)
return Elf_Dyn_Iter(0, nullptr);
Elf_Dyn_Iter Ret(DynamicRegion.EntSize,
(const char *)DynamicRegion.Addr + DynamicRegion.Size);
if (NULLEnd) {
- Elf_Dyn_Iter Start = begin_dynamic_table();
+ Elf_Dyn_Iter Start = dynamic_table_begin();
while (Start != Ret && Start->getTag() != ELF::DT_NULL)
++Start;
template <class ELFT>
StringRef ELFFile<ELFT>::getLoadName() const {
if (!dt_soname) {
+ dt_soname = "";
// Find the DT_SONAME entry
- Elf_Dyn_Iter it = begin_dynamic_table();
- Elf_Dyn_Iter ie = end_dynamic_table();
- while (it != ie && it->getTag() != ELF::DT_SONAME)
- ++it;
-
- if (it != ie) {
- dt_soname = getDynamicString(it->getVal());
- } else {
- dt_soname = "";
- }
+ for (const auto &Entry : dynamic_table())
+ if (Entry.getTag() == ELF::DT_SONAME) {
+ dt_soname = getDynamicString(Entry.getVal());
+ break;
+ }
}
return dt_soname;
}
template <class ELFT>
template <typename T>
const T *ELFFile<ELFT>::getEntry(uint32_t Section, uint32_t Entry) const {
- return getEntry<T>(getSection(Section), Entry);
+ ErrorOr<const Elf_Shdr *> Sec = getSection(Section);
+ if (std::error_code EC = Sec.getError())
+ report_fatal_error(EC.message());
+ return getEntry<T>(*Sec, Entry);
}
template <class ELFT>
}
template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Shdr *
-ELFFile<ELFT>::getSection(uint32_t index) const {
- if (index == 0)
- return nullptr;
- if (!SectionHeaderTable || index >= getNumSections())
- // FIXME: Proper error handling.
- report_fatal_error("Invalid section index!");
+ErrorOr<const typename ELFFile<ELFT>::Elf_Shdr *>
+ELFFile<ELFT>::getSection(uint32_t Index) const {
+ assert(SectionHeaderTable && "SectionHeaderTable not initialized!");
+ if (Index >= getNumSections())
+ return object_error::invalid_section_index;
return reinterpret_cast<const Elf_Shdr *>(
- reinterpret_cast<const char *>(SectionHeaderTable)
- + (index * Header->e_shentsize));
-}
-
-template <class ELFT>
-const char *ELFFile<ELFT>::getString(uint32_t section,
- ELF::Elf32_Word offset) const {
- return getString(getSection(section), offset);
+ reinterpret_cast<const char *>(SectionHeaderTable) +
+ (Index * Header->e_shentsize));
}
template <class ELFT>
-const char *ELFFile<ELFT>::getString(const Elf_Shdr *section,
- ELF::Elf32_Word offset) const {
- assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!");
- if (offset >= section->sh_size)
- // FIXME: Proper error handling.
- report_fatal_error("Symbol name offset outside of string table!");
- return (const char *)base() + section->sh_offset + offset;
+ErrorOr<StringRef>
+ELFFile<ELFT>::getStringTable(const Elf_Shdr *Section) const {
+ if (Section->sh_type != ELF::SHT_STRTAB)
+ return object_error::parse_failed;
+ uint64_t Offset = Section->sh_offset;
+ uint64_t Size = Section->sh_size;
+ if (Offset + Size > Buf.size())
+ return object_error::parse_failed;
+ StringRef Data((const char *)base() + Section->sh_offset, Size);
+ if (Data[Size - 1] != '\0')
+ return object_error::string_table_non_null_end;
+ return Data;
}
template <class ELFT>
const char *ELFFile<ELFT>::getDynamicString(uintX_t Offset) const {
- if (!DynStrRegion.Addr || Offset >= DynStrRegion.Size)
+ if (!DotDynSymSec || Offset >= DynSymStrTab.size())
return nullptr;
- return (const char *)DynStrRegion.Addr + Offset;
+ return (const char *)DynSymStrTab.begin() + Offset;
}
template <class ELFT>
-ErrorOr<StringRef> ELFFile<ELFT>::getSymbolName(Elf_Sym_Iter Sym) const {
- if (!Sym.isDynamic())
- return getSymbolName(dot_symtab_sec, &*Sym);
-
- if (!DynStrRegion.Addr || Sym->st_name >= DynStrRegion.Size)
- return object_error::parse_failed;
- return StringRef(getDynamicString(Sym->st_name));
+ErrorOr<StringRef>
+ELFFile<ELFT>::getStaticSymbolName(const Elf_Sym *Symb) const {
+ return Symb->getName(DotStrtab);
}
template <class ELFT>
-ErrorOr<StringRef> ELFFile<ELFT>::getSymbolName(const Elf_Shdr *Section,
- const Elf_Sym *Symb) const {
- if (Symb->st_name == 0) {
- const Elf_Shdr *ContainingSec = getSection(Symb);
- if (ContainingSec)
- return getSectionName(ContainingSec);
- }
+ErrorOr<StringRef>
+ELFFile<ELFT>::getDynamicSymbolName(const Elf_Sym *Symb) const {
+ return StringRef(getDynamicString(Symb->st_name));
+}
- const Elf_Shdr *StrTab = getSection(Section->sh_link);
- if (Symb->st_name >= StrTab->sh_size)
- return object_error::parse_failed;
- return StringRef(getString(StrTab, Symb->st_name));
+template <class ELFT>
+ErrorOr<StringRef> ELFFile<ELFT>::getSymbolName(const Elf_Sym *Symb,
+ bool IsDynamic) const {
+ if (IsDynamic)
+ return getDynamicSymbolName(Symb);
+ return getStaticSymbolName(Symb);
}
template <class ELFT>
ErrorOr<StringRef>
ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const {
- if (Section->sh_name >= dot_shstrtab_sec->sh_size)
+ uint32_t Offset = Section->sh_name;
+ if (Offset >= DotShstrtab.size())
return object_error::parse_failed;
- return StringRef(getString(dot_shstrtab_sec, Section->sh_name));
+ return StringRef(DotShstrtab.data() + Offset);
}
template <class ELFT>
ErrorOr<StringRef> ELFFile<ELFT>::getSymbolVersion(const Elf_Shdr *section,
const Elf_Sym *symb,
bool &IsDefault) const {
+ StringRef StrTab;
+ if (section) {
+ ErrorOr<StringRef> StrTabOrErr = getStringTable(section);
+ if (std::error_code EC = StrTabOrErr.getError())
+ return EC;
+ StrTab = *StrTabOrErr;
+ }
// Handle non-dynamic symbols.
- if (section != DynSymRegion.Addr && section != nullptr) {
+ if (section != DotDynSymSec && section != nullptr) {
// Non-dynamic symbols can have versions in their names
// A name of the form 'foo@V1' indicates version 'V1', non-default.
// A name of the form 'foo@@V2' indicates version 'V2', default version.
- ErrorOr<StringRef> SymName = getSymbolName(section, symb);
+ ErrorOr<StringRef> SymName = symb->getName(StrTab);
if (!SymName)
return SymName;
StringRef Name = *SymName;
}
// Determine the position in the symbol table of this entry.
- size_t entry_index = ((const char *)symb - (const char *)DynSymRegion.Addr) /
- DynSymRegion.EntSize;
+ size_t entry_index =
+ (reinterpret_cast<uintptr_t>(symb) - DotDynSymSec->sh_offset -
+ reinterpret_cast<uintptr_t>(base())) /
+ sizeof(Elf_Sym);
// Get the corresponding version index entry
const Elf_Versym *vs = getEntry<Elf_Versym>(dot_gnu_version_sec, entry_index);
IsDefault = false;
}
- if (name_offset >= DynStrRegion.Size)
+ if (name_offset >= DynSymStrTab.size())
return object_error::parse_failed;
return StringRef(getDynamicString(name_offset));
}
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