#ifndef LLVM_OBJECT_ELF_H
#define LLVM_OBJECT_ELF_H
-#include "llvm/ADT/ArrayRef.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/ELFTypes.h"
-#include "llvm/Object/Error.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/ELF.h"
-#include "llvm/Support/Endian.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <limits>
-#include <utility>
namespace llvm {
namespace object {
typedef typename std::conditional<ELFT::Is64Bits,
uint64_t, uint32_t>::type uintX_t;
- /// \brief Iterate over constant sized entities.
- template <class EntT>
- class ELFEntityIterator {
- public:
- typedef ptrdiff_t difference_type;
- typedef EntT value_type;
- typedef std::forward_iterator_tag iterator_category;
- typedef value_type &reference;
- typedef value_type *pointer;
-
- /// \brief Default construct iterator.
- ELFEntityIterator() : EntitySize(0), Current(nullptr) {}
- ELFEntityIterator(uintX_t EntSize, const char *Start)
- : EntitySize(EntSize), Current(Start) {}
-
- reference operator *() {
- assert(Current && "Attempted to dereference an invalid iterator!");
- return *reinterpret_cast<pointer>(Current);
- }
-
- pointer operator ->() {
- assert(Current && "Attempted to dereference an invalid iterator!");
- return reinterpret_cast<pointer>(Current);
- }
-
- bool operator ==(const ELFEntityIterator &Other) {
- return Current == Other.Current;
- }
-
- bool operator !=(const ELFEntityIterator &Other) {
- return !(*this == Other);
- }
-
- ELFEntityIterator &operator ++() {
- assert(Current && "Attempted to increment an invalid iterator!");
- Current += EntitySize;
- 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;
- }
-
- difference_type operator -(const ELFEntityIterator &Other) const {
- assert(EntitySize == Other.EntitySize &&
- "Subtracting iterators of different EntitySize!");
- return (Current - Other.Current) / EntitySize;
- }
-
- const char *get() const { return Current; }
-
- uintX_t getEntSize() const { return EntitySize; }
-
- private:
- uintX_t EntitySize;
- const char *Current;
- };
-
typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
typedef Elf_Shdr_Impl<ELFT> Elf_Shdr;
typedef Elf_Sym_Impl<ELFT> Elf_Sym;
typedef Elf_Vernaux_Impl<ELFT> Elf_Vernaux;
typedef Elf_Versym_Impl<ELFT> Elf_Versym;
typedef Elf_Hash_Impl<ELFT> Elf_Hash;
+ typedef Elf_GnuHash_Impl<ELFT> Elf_GnuHash;
typedef iterator_range<const Elf_Dyn *> Elf_Dyn_Range;
typedef iterator_range<const Elf_Shdr *> Elf_Shdr_Range;
-
- /// \brief Archive files are 2 byte aligned, so we need this for
- /// PointerIntPair to work.
- template <typename T>
- class ArchivePointerTypeTraits {
- public:
- static inline const void *getAsVoidPointer(T *P) { return P; }
- static inline T *getFromVoidPointer(const void *P) {
- return static_cast<T *>(P);
- }
- enum { NumLowBitsAvailable = 1 };
- };
-
typedef iterator_range<const Elf_Sym *> Elf_Sym_Range;
const uint8_t *base() const {
}
private:
- typedef SmallVector<const Elf_Shdr *, 2> Sections_t;
- typedef DenseMap<unsigned, unsigned> IndexMap_t;
StringRef Buf;
const Elf_Ehdr *Header;
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.
- const Elf_Shdr *DotDynSymSec = nullptr; // Dynamic symbol table section.
-
- const Elf_Shdr *SymbolTableSectionHeaderIndex = nullptr;
- DenseMap<const Elf_Sym *, ELF::Elf64_Word> ExtendedSymbolTable;
-
- 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
-
- // Records for each version index the corresponding Verdef or Vernaux entry.
- // This is filled the first time LoadVersionMap() is called.
- class VersionMapEntry : public PointerIntPair<const void*, 1> {
- public:
- // If the integer is 0, this is an Elf_Verdef*.
- // If the integer is 1, this is an Elf_Vernaux*.
- VersionMapEntry() : PointerIntPair<const void*, 1>(nullptr, 0) { }
- VersionMapEntry(const Elf_Verdef *verdef)
- : PointerIntPair<const void*, 1>(verdef, 0) { }
- VersionMapEntry(const Elf_Vernaux *vernaux)
- : PointerIntPair<const void*, 1>(vernaux, 1) { }
- bool isNull() const { return getPointer() == nullptr; }
- bool isVerdef() const { return !isNull() && getInt() == 0; }
- bool isVernaux() const { return !isNull() && getInt() == 1; }
- const Elf_Verdef *getVerdef() const {
- return isVerdef() ? (const Elf_Verdef*)getPointer() : nullptr;
- }
- const Elf_Vernaux *getVernaux() const {
- return isVernaux() ? (const Elf_Vernaux*)getPointer() : nullptr;
- }
- };
- mutable SmallVector<VersionMapEntry, 16> VersionMap;
- void LoadVersionDefs(const Elf_Shdr *sec) const;
- void LoadVersionNeeds(const Elf_Shdr *ec) const;
- void LoadVersionMap() const;
public:
template<typename T>
template <typename T>
const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const;
- const Elf_Shdr *getDotSymtabSec() const { return dot_symtab_sec; }
- const Elf_Shdr *getDotDynSymSec() const { return DotDynSymSec; }
-
ErrorOr<StringRef> getStringTable(const Elf_Shdr *Section) const;
ErrorOr<StringRef> getStringTableForSymtab(const Elf_Shdr &Section) const;
- ErrorOr<StringRef> getSymbolVersion(StringRef StrTab, const Elf_Sym *Symb,
- bool &IsDefault) const;
+ ErrorOr<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section) const;
+
void VerifyStrTab(const Elf_Shdr *sh) const;
StringRef getRelocationTypeName(uint32_t Type) const;
void getRelocationTypeName(uint32_t Type,
SmallVectorImpl<char> &Result) const;
- /// \brief Get the symbol table section and symbol for a given relocation.
- template <class RelT>
- std::pair<const Elf_Shdr *, const Elf_Sym *>
- getRelocationSymbol(const Elf_Shdr *RelSec, const RelT *Rel) const;
+ /// \brief Get the symbol for a given relocation.
+ const Elf_Sym *getRelocationSymbol(const Elf_Rel *Rel,
+ const Elf_Shdr *SymTab) const;
ELFFile(StringRef Object, std::error_code &EC);
Header->getDataEncoding() == ELF::ELFDATA2LSB;
}
+ ErrorOr<const Elf_Dyn *> dynamic_table_begin(const Elf_Phdr *Phdr) const;
+ ErrorOr<const Elf_Dyn *> dynamic_table_end(const Elf_Phdr *Phdr) const;
+ ErrorOr<Elf_Dyn_Range> dynamic_table(const Elf_Phdr *Phdr) const {
+ ErrorOr<const Elf_Dyn *> Begin = dynamic_table_begin(Phdr);
+ if (std::error_code EC = Begin.getError())
+ return EC;
+ ErrorOr<const Elf_Dyn *> End = dynamic_table_end(Phdr);
+ if (std::error_code EC = End.getError())
+ return EC;
+ return make_range(*Begin, *End);
+ }
+
const Elf_Shdr *section_begin() const;
const Elf_Shdr *section_end() const;
Elf_Shdr_Range sections() const {
return make_range(section_begin(), section_end());
}
- const Elf_Sym *symbol_begin() const;
- const Elf_Sym *symbol_end() const;
- Elf_Sym_Range symbols() const {
- return make_range(symbol_begin(), symbol_end());
- }
-
- const Elf_Sym *dynamic_symbol_begin() const {
- if (!DotDynSymSec)
+ const Elf_Sym *symbol_begin(const Elf_Shdr *Sec) const {
+ if (!Sec)
return nullptr;
- if (DotDynSymSec->sh_entsize != sizeof(Elf_Sym))
+ if (Sec->sh_entsize != sizeof(Elf_Sym))
report_fatal_error("Invalid symbol size");
- return reinterpret_cast<const Elf_Sym *>(base() + DotDynSymSec->sh_offset);
+ return reinterpret_cast<const Elf_Sym *>(base() + Sec->sh_offset);
}
-
- const Elf_Sym *dynamic_symbol_end() const {
- if (!DotDynSymSec)
+ const Elf_Sym *symbol_end(const Elf_Shdr *Sec) const {
+ if (!Sec)
return nullptr;
- return reinterpret_cast<const Elf_Sym *>(base() + DotDynSymSec->sh_offset +
- DotDynSymSec->sh_size);
+ uint64_t Size = Sec->sh_size;
+ if (Size % sizeof(Elf_Sym))
+ report_fatal_error("Invalid symbol table size");
+ return symbol_begin(Sec) + Size / sizeof(Elf_Sym);
}
-
- Elf_Sym_Range dynamic_symbols() const {
- return make_range(dynamic_symbol_begin(), dynamic_symbol_end());
+ Elf_Sym_Range symbols(const Elf_Shdr *Sec) const {
+ return make_range(symbol_begin(Sec), symbol_end(Sec));
}
typedef iterator_range<const Elf_Rela *> Elf_Rela_Range;
uint64_t getNumSections() const;
uintX_t getStringTableIndex() const;
- ELF::Elf64_Word getExtendedSymbolTableIndex(const Elf_Sym *symb) const;
+ uint32_t getExtendedSymbolTableIndex(const Elf_Sym *Sym,
+ const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const;
const Elf_Ehdr *getHeader() const { return Header; }
- ErrorOr<const Elf_Shdr *> getSection(const Elf_Sym *symb) const;
+ ErrorOr<const Elf_Shdr *> getSection(const Elf_Sym *Sym,
+ const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const;
ErrorOr<const Elf_Shdr *> getSection(uint32_t Index) const;
- const Elf_Sym *getSymbol(uint32_t index) const;
+
+ const Elf_Sym *getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
+ return &*(symbol_begin(Sec) + Index);
+ }
ErrorOr<StringRef> getSectionName(const Elf_Shdr *Section) const;
+ template <typename T>
+ ErrorOr<ArrayRef<T>> getSectionContentsAsArray(const Elf_Shdr *Sec) const;
ErrorOr<ArrayRef<uint8_t> > getSectionContents(const Elf_Shdr *Sec) const;
};
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>::LoadVersionDefs(const Elf_Shdr *sec) const {
- unsigned vd_size = sec->sh_size; // Size of section in bytes
- unsigned vd_count = sec->sh_info; // Number of Verdef entries
- const char *sec_start = (const char*)base() + sec->sh_offset;
- const char *sec_end = sec_start + vd_size;
- // The first Verdef entry is at the start of the section.
- const char *p = sec_start;
- for (unsigned i = 0; i < vd_count; i++) {
- if (p + sizeof(Elf_Verdef) > sec_end)
- report_fatal_error("Section ended unexpectedly while scanning "
- "version definitions.");
- const Elf_Verdef *vd = reinterpret_cast<const Elf_Verdef *>(p);
- if (vd->vd_version != ELF::VER_DEF_CURRENT)
- report_fatal_error("Unexpected verdef version");
- size_t index = vd->vd_ndx & ELF::VERSYM_VERSION;
- if (index >= VersionMap.size())
- VersionMap.resize(index + 1);
- VersionMap[index] = VersionMapEntry(vd);
- p += vd->vd_next;
- }
-}
-
-// Iterate through the versions needed section, and place each Elf_Vernaux
-// in the VersionMap according to its index.
template <class ELFT>
-void ELFFile<ELFT>::LoadVersionNeeds(const Elf_Shdr *sec) const {
- unsigned vn_size = sec->sh_size; // Size of section in bytes
- unsigned vn_count = sec->sh_info; // Number of Verneed entries
- const char *sec_start = (const char *)base() + sec->sh_offset;
- const char *sec_end = sec_start + vn_size;
- // The first Verneed entry is at the start of the section.
- const char *p = sec_start;
- for (unsigned i = 0; i < vn_count; i++) {
- if (p + sizeof(Elf_Verneed) > sec_end)
- report_fatal_error("Section ended unexpectedly while scanning "
- "version needed records.");
- const Elf_Verneed *vn = reinterpret_cast<const Elf_Verneed *>(p);
- if (vn->vn_version != ELF::VER_NEED_CURRENT)
- report_fatal_error("Unexpected verneed version");
- // Iterate through the Vernaux entries
- const char *paux = p + vn->vn_aux;
- for (unsigned j = 0; j < vn->vn_cnt; j++) {
- if (paux + sizeof(Elf_Vernaux) > sec_end)
- report_fatal_error("Section ended unexpected while scanning auxiliary "
- "version needed records.");
- const Elf_Vernaux *vna = reinterpret_cast<const Elf_Vernaux *>(paux);
- size_t index = vna->vna_other & ELF::VERSYM_VERSION;
- if (index >= VersionMap.size())
- VersionMap.resize(index + 1);
- VersionMap[index] = VersionMapEntry(vna);
- paux += vna->vna_next;
- }
- p += vn->vn_next;
- }
-}
-
-template <class ELFT>
-void ELFFile<ELFT>::LoadVersionMap() const {
- // If there is no dynamic symtab or version table, there is nothing to do.
- if (!DotDynSymSec || !dot_gnu_version_sec)
- return;
-
- // Has the VersionMap already been loaded?
- if (VersionMap.size() > 0)
- return;
-
- // The first two version indexes are reserved.
- // Index 0 is LOCAL, index 1 is GLOBAL.
- VersionMap.push_back(VersionMapEntry());
- VersionMap.push_back(VersionMapEntry());
-
- if (dot_gnu_version_d_sec)
- LoadVersionDefs(dot_gnu_version_d_sec);
-
- if (dot_gnu_version_r_sec)
- LoadVersionNeeds(dot_gnu_version_r_sec);
-}
-
-template <class ELFT>
-ELF::Elf64_Word
-ELFFile<ELFT>::getExtendedSymbolTableIndex(const Elf_Sym *symb) const {
- assert(symb->st_shndx == ELF::SHN_XINDEX);
- return ExtendedSymbolTable.lookup(symb);
+uint32_t ELFFile<ELFT>::getExtendedSymbolTableIndex(
+ const Elf_Sym *Sym, const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const {
+ assert(Sym->st_shndx == ELF::SHN_XINDEX);
+ unsigned Index = Sym - symbol_begin(SymTab);
+
+ // The size of the table was checked in getSHNDXTable.
+ return ShndxTable[Index];
}
template <class ELFT>
ErrorOr<const typename ELFFile<ELFT>::Elf_Shdr *>
-ELFFile<ELFT>::getSection(const Elf_Sym *symb) const {
- uint32_t Index = symb->st_shndx;
+ELFFile<ELFT>::getSection(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const {
+ uint32_t Index = Sym->st_shndx;
if (Index == ELF::SHN_XINDEX)
- return getSection(ExtendedSymbolTable.lookup(symb));
+ return getSection(getExtendedSymbolTableIndex(Sym, SymTab, ShndxTable));
+
if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
return nullptr;
- return getSection(symb->st_shndx);
+ return getSection(Sym->st_shndx);
}
template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Sym *
-ELFFile<ELFT>::getSymbol(uint32_t Index) const {
- return &*(symbol_begin() + Index);
+template <typename T>
+ErrorOr<ArrayRef<T>>
+ELFFile<ELFT>::getSectionContentsAsArray(const Elf_Shdr *Sec) const {
+ uintX_t Offset = Sec->sh_offset;
+ uintX_t Size = Sec->sh_size;
+
+ if (Size % sizeof(T))
+ return object_error::parse_failed;
+ if (Offset + Size > Buf.size())
+ return object_error::parse_failed;
+
+ const T *Start = reinterpret_cast<const T *>(base() + Offset);
+ return makeArrayRef(Start, Size / sizeof(T));
}
template <class ELFT>
-ErrorOr<ArrayRef<uint8_t> >
+ErrorOr<ArrayRef<uint8_t>>
ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
- if (Sec->sh_offset + Sec->sh_size > Buf.size())
- return object_error::parse_failed;
- const uint8_t *Start = base() + Sec->sh_offset;
- return makeArrayRef(Start, Sec->sh_size);
+ return getSectionContentsAsArray<uint8_t>(Sec);
}
template <class ELFT>
}
template <class ELFT>
-template <class RelT>
-std::pair<const typename ELFFile<ELFT>::Elf_Shdr *,
- 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(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())));
+const typename ELFFile<ELFT>::Elf_Sym *
+ELFFile<ELFT>::getRelocationSymbol(const Elf_Rel *Rel,
+ const Elf_Shdr *SymTab) const {
+ uint32_t Index = Rel->getSymbol(isMips64EL());
+ if (Index == 0)
+ return nullptr;
+ return getEntry<Elf_Sym>(SymTab, Index);
}
template <class ELFT>
return;
}
- // Scan sections for special sections.
-
- for (const Elf_Shdr &Sec : sections()) {
- switch (Sec.sh_type) {
- 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<StringRef> SymtabOrErr = getStringTableForSymtab(Sec);
- if ((EC = SymtabOrErr.getError()))
- return;
- DotStrtab = *SymtabOrErr;
- } break;
- case ELF::SHT_DYNSYM: {
- if (DotDynSymSec) {
- // More than one .dynsym!
- EC = object_error::parse_failed;
- return;
- }
- DotDynSymSec = &Sec;
- break;
- }
- case ELF::SHT_GNU_versym:
- 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) {
- // 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) {
- // More than one .gnu.version_r section!
- EC = object_error::parse_failed;
- return;
- }
- dot_gnu_version_r_sec = &Sec;
- break;
- }
- }
-
// Get string table sections.
uintX_t StringTableIndex = getStringTableIndex();
if (StringTableIndex) {
- ErrorOr<const Elf_Shdr *> StrTabSecOrErr =
- getSection(getStringTableIndex());
+ ErrorOr<const Elf_Shdr *> StrTabSecOrErr = getSection(StringTableIndex);
if ((EC = StrTabSecOrErr.getError()))
return;
- ErrorOr<StringRef> SymtabOrErr = getStringTable(*StrTabSecOrErr);
- if ((EC = SymtabOrErr.getError()))
+ ErrorOr<StringRef> StringTableOrErr = getStringTable(*StrTabSecOrErr);
+ if ((EC = StringTableOrErr.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 (const Elf_Sym &S : symbols()) {
- if (*ShndxTable != ELF::SHN_UNDEF)
- ExtendedSymbolTable[&S] = *ShndxTable;
- ++ShndxTable;
- }
+ DotShstrtab = *StringTableOrErr;
}
EC = std::error_code();
}
template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Sym *ELFFile<ELFT>::symbol_begin() const {
- if (!dot_symtab_sec)
+ErrorOr<const typename ELFFile<ELFT>::Elf_Dyn *>
+ELFFile<ELFT>::dynamic_table_begin(const Elf_Phdr *Phdr) const {
+ if (!Phdr)
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);
+ assert(Phdr->p_type == ELF::PT_DYNAMIC && "Got the wrong program header");
+ uintX_t Offset = Phdr->p_offset;
+ if (Offset > Buf.size())
+ return object_error::parse_failed;
+ return reinterpret_cast<const Elf_Dyn *>(base() + Offset);
}
template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Sym *ELFFile<ELFT>::symbol_end() const {
- if (!dot_symtab_sec)
+ErrorOr<const typename ELFFile<ELFT>::Elf_Dyn *>
+ELFFile<ELFT>::dynamic_table_end(const Elf_Phdr *Phdr) const {
+ if (!Phdr)
return nullptr;
- return reinterpret_cast<const Elf_Sym *>(base() + dot_symtab_sec->sh_offset +
- dot_symtab_sec->sh_size);
+ assert(Phdr->p_type == ELF::PT_DYNAMIC && "Got the wrong program header");
+ uintX_t Size = Phdr->p_filesz;
+ if (Size % sizeof(Elf_Dyn))
+ return object_error::elf_invalid_dynamic_table_size;
+ // FIKME: Check for overflow?
+ uintX_t End = Phdr->p_offset + Size;
+ if (End > Buf.size())
+ return object_error::parse_failed;
+ return reinterpret_cast<const Elf_Dyn *>(base() + End);
}
template <class ELFT>
return Data;
}
+template <class ELFT>
+ErrorOr<ArrayRef<typename ELFFile<ELFT>::Elf_Word>>
+ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section) const {
+ assert(Section.sh_type == ELF::SHT_SYMTAB_SHNDX);
+ const Elf_Word *ShndxTableBegin =
+ reinterpret_cast<const Elf_Word *>(base() + Section.sh_offset);
+ uintX_t Size = Section.sh_size;
+ if (Size % sizeof(uint32_t))
+ return object_error::parse_failed;
+ uintX_t NumSymbols = Size / sizeof(uint32_t);
+ const Elf_Word *ShndxTableEnd = ShndxTableBegin + NumSymbols;
+ if (reinterpret_cast<const char *>(ShndxTableEnd) > Buf.end())
+ return object_error::parse_failed;
+ ErrorOr<const Elf_Shdr *> SymTableOrErr = getSection(Section.sh_link);
+ if (std::error_code EC = SymTableOrErr.getError())
+ return EC;
+ const Elf_Shdr &SymTable = **SymTableOrErr;
+ if (SymTable.sh_type != ELF::SHT_SYMTAB &&
+ SymTable.sh_type != ELF::SHT_DYNSYM)
+ return object_error::parse_failed;
+ if (NumSymbols != (SymTable.sh_size / sizeof(Elf_Sym)))
+ return object_error::parse_failed;
+ return makeArrayRef(ShndxTableBegin, ShndxTableEnd);
+}
+
template <class ELFT>
ErrorOr<StringRef>
ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec) const {
return StringRef(DotShstrtab.data() + Offset);
}
-template <class ELFT>
-ErrorOr<StringRef> ELFFile<ELFT>::getSymbolVersion(StringRef StrTab,
- const Elf_Sym *symb,
- bool &IsDefault) const {
- // This is a dynamic symbol. Look in the GNU symbol version table.
- if (!dot_gnu_version_sec) {
- // No version table.
- IsDefault = false;
- return StringRef("");
- }
-
- // Determine the position in the symbol table of this entry.
- 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);
- size_t version_index = vs->vs_index & ELF::VERSYM_VERSION;
-
- // Special markers for unversioned symbols.
- if (version_index == ELF::VER_NDX_LOCAL ||
- version_index == ELF::VER_NDX_GLOBAL) {
- IsDefault = false;
- return StringRef("");
- }
-
- // Lookup this symbol in the version table
- LoadVersionMap();
- if (version_index >= VersionMap.size() || VersionMap[version_index].isNull())
- return object_error::parse_failed;
- const VersionMapEntry &entry = VersionMap[version_index];
-
- // Get the version name string
- size_t name_offset;
- if (entry.isVerdef()) {
- // The first Verdaux entry holds the name.
- name_offset = entry.getVerdef()->getAux()->vda_name;
- } else {
- name_offset = entry.getVernaux()->vna_name;
- }
-
- // Set IsDefault
- if (entry.isVerdef()) {
- IsDefault = !(vs->vs_index & ELF::VERSYM_HIDDEN);
- } else {
- IsDefault = false;
- }
-
- if (name_offset >= StrTab.size())
- return object_error::parse_failed;
- return StringRef(StrTab.data() + name_offset);
-}
-
/// This function returns the hash value for a symbol in the .dynsym section
/// Name of the API remains consistent as specified in the libelf
/// REF : http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#hash
projects / oota-llvm.git / blobdiff