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 iterator_range<const Elf_Shdr *> Elf_Shdr_Range;
/// \brief Archive files are 2 byte aligned, so we need this for
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;
DynRegionInfo DynamicRegion;
DynRegionInfo DynHashRegion;
+ DynRegionInfo DynStrRegion;
DynRegionInfo DynRelaRegion;
// Pointer to SONAME entry in dynamic string table
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 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,
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);
+ const Elf_Rela *dyn_rela_begin() const {
+ if (DynRelaRegion.Size && DynRelaRegion.EntSize != sizeof(Elf_Rela))
+ report_fatal_error("Invalid relocation entry size");
+ return reinterpret_cast<const Elf_Rela *>(DynRelaRegion.Addr);
}
- 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);
+ const Elf_Rela *dyn_rela_end() const {
+ uint64_t Size = DynRelaRegion.Size;
+ if (Size % sizeof(Elf_Rela))
+ report_fatal_error("Invalid relocation table size");
+ return dyn_rela_begin() + Size / sizeof(Elf_Rela);
+ }
+
+ typedef iterator_range<const Elf_Rela *> Elf_Rela_Range;
+
+ Elf_Rela_Range dyn_relas() const {
+ return make_range(dyn_rela_begin(), dyn_rela_end());
}
- Elf_Rela_Iter rela_begin(const Elf_Shdr *sec) const {
- return Elf_Rela_Iter(sec->sh_entsize,
- (const char *)(base() + sec->sh_offset));
+ const Elf_Rela *rela_begin(const Elf_Shdr *sec) const {
+ if (sec->sh_entsize != sizeof(Elf_Rela))
+ report_fatal_error("Invalid relocation entry size");
+ return reinterpret_cast<const Elf_Rela *>(base() + sec->sh_offset);
}
- 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));
+ const Elf_Rela *rela_end(const Elf_Shdr *sec) const {
+ uint64_t Size = sec->sh_size;
+ if (Size % sizeof(Elf_Rela))
+ report_fatal_error("Invalid relocation table size");
+ return rela_begin(sec) + Size / sizeof(Elf_Rela);
}
- Elf_Rel_Iter rel_begin(const Elf_Shdr *sec) const {
- return Elf_Rel_Iter(sec->sh_entsize,
- (const char *)(base() + sec->sh_offset));
+ Elf_Rela_Range relas(const Elf_Shdr *Sec) const {
+ return make_range(rela_begin(Sec), rela_end(Sec));
}
- 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));
+ const Elf_Rel *rel_begin(const Elf_Shdr *sec) const {
+ if (sec->sh_entsize != sizeof(Elf_Rel))
+ report_fatal_error("Invalid relocation entry size");
+ return reinterpret_cast<const Elf_Rel *>(base() + sec->sh_offset);
+ }
+
+ const Elf_Rel *rel_end(const Elf_Shdr *sec) const {
+ uint64_t Size = sec->sh_size;
+ if (Size % sizeof(Elf_Rel))
+ report_fatal_error("Invalid relocation table size");
+ return rel_begin(sec) + Size / sizeof(Elf_Rel);
+ }
+
+ typedef iterator_range<const Elf_Rel *> Elf_Rel_Range;
+ Elf_Rel_Range rels(const Elf_Shdr *Sec) const {
+ return make_range(rel_begin(Sec), rel_end(Sec));
}
/// \brief Iterate over program header table.
- typedef ELFEntityIterator<const Elf_Phdr> Elf_Phdr_Iter;
+ const Elf_Phdr *program_header_begin() const {
+ if (Header->e_phnum && Header->e_phentsize != sizeof(Elf_Phdr))
+ report_fatal_error("Invalid program header size");
+ return reinterpret_cast<const Elf_Phdr *>(base() + Header->e_phoff);
+ }
- Elf_Phdr_Iter program_header_begin() const {
- return Elf_Phdr_Iter(Header->e_phentsize,
- (const char*)base() + Header->e_phoff);
+ const Elf_Phdr *program_header_end() const {
+ return program_header_begin() + Header->e_phnum;
}
- Elf_Phdr_Iter program_header_end() const {
- return Elf_Phdr_Iter(Header->e_phentsize,
- (const char*)base() +
- Header->e_phoff +
- (Header->e_phnum * Header->e_phentsize));
+ typedef iterator_range<const Elf_Phdr *> Elf_Phdr_Range;
+
+ const Elf_Phdr_Range program_headers() const {
+ return make_range(program_header_begin(), program_header_end());
}
uint64_t getNumSections() const;
ErrorOr<StringRef> getSymbolName(const Elf_Sym *Symb, bool IsDynamic) 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;
};
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;
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_SHNDX:
if (SymbolTableSectionHeaderIndex) {
// More than one .symtab_shndx!
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:
}
}
- // Scan program headers.
- 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;
+ scanDynamicTable();
+
+ EC = std::error_code();
+}
+
+template <class ELFT>
+static bool compareAddr(uint64_t VAddr, const Elf_Phdr_Impl<ELFT> *Phdr) {
+ return VAddr < Phdr->p_vaddr;
+}
+
+template <class ELFT> void ELFFile<ELFT>::scanDynamicTable() {
+ SmallVector<const Elf_Phdr *, 4> LoadSegments;
+ for (const Elf_Phdr &Phdr : program_headers()) {
+ if (Phdr.p_type == ELF::PT_DYNAMIC) {
+ DynamicRegion.Addr = base() + Phdr.p_offset;
+ DynamicRegion.Size = Phdr.p_filesz;
DynamicRegion.EntSize = sizeof(Elf_Dyn);
- break;
+ continue;
}
+ if (Phdr.p_type != ELF::PT_LOAD || Phdr.p_filesz == 0)
+ continue;
+ LoadSegments.push_back(&Phdr);
}
- // Scan dynamic table.
+ auto toMappedAddr = [&](uint64_t VAddr) -> const uint8_t * {
+ const Elf_Phdr **I = std::upper_bound(
+ LoadSegments.begin(), LoadSegments.end(), VAddr, compareAddr<ELFT>);
+ if (I == LoadSegments.begin())
+ report_fatal_error("Virtual address is not in any segment");
+ --I;
+ const Elf_Phdr &Phdr = **I;
+ uint64_t Delta = VAddr - Phdr.p_vaddr;
+ if (Delta >= Phdr.p_filesz)
+ report_fatal_error("Virtual address is not in any segment");
+ return this->base() + Phdr.p_offset + Delta;
+ };
+
for (Elf_Dyn_Iter DynI = dynamic_table_begin(), DynE = dynamic_table_end();
DynI != DynE; ++DynI) {
switch (DynI->d_tag) {
- case ELF::DT_RELA: {
- uint64_t VBase = 0;
- const uint8_t *FBase = nullptr;
- for (Elf_Phdr_Iter PhdrI = program_header_begin(),
- PhdrE = program_header_end();
- PhdrI != PhdrE; ++PhdrI) {
- if (PhdrI->p_type != ELF::PT_LOAD)
- continue;
- if (DynI->getPtr() >= PhdrI->p_vaddr &&
- DynI->getPtr() < PhdrI->p_vaddr + PhdrI->p_memsz) {
- VBase = PhdrI->p_vaddr;
- FBase = base() + PhdrI->p_offset;
- break;
- }
- }
- if (!VBase)
- return;
- DynRelaRegion.Addr = FBase + DynI->getPtr() - VBase;
+ case ELF::DT_HASH:
+ if (HashTable)
+ continue;
+ HashTable =
+ reinterpret_cast<const Elf_Hash *>(toMappedAddr(DynI->getPtr()));
+ break;
+ case ELF::DT_STRTAB:
+ if (!DynStrRegion.Addr)
+ DynStrRegion.Addr = toMappedAddr(DynI->getPtr());
+ break;
+ case ELF::DT_STRSZ:
+ if (!DynStrRegion.Size)
+ DynStrRegion.Size = DynI->getVal();
+ break;
+ case ELF::DT_RELA:
+ if (!DynRelaRegion.Addr)
+ DynRelaRegion.Addr = toMappedAddr(DynI->getPtr());
break;
- }
case ELF::DT_RELASZ:
DynRelaRegion.Size = DynI->getVal();
break;
DynRelaRegion.EntSize = DynI->getVal();
}
}
-
- EC = std::error_code();
-}
-
-// 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;
}
template <class ELFT>
template <class ELFT>
const char *ELFFile<ELFT>::getDynamicString(uintX_t Offset) const {
- if (!DotDynSymSec || Offset >= DynSymStrTab.size())
+ if (Offset >= DynStrRegion.Size)
return nullptr;
- return (const char *)DynSymStrTab.begin() + Offset;
+ return (const char *)DynStrRegion.Addr + Offset;
}
template <class ELFT>
IsDefault = false;
}
- if (name_offset >= DynSymStrTab.size())
+ if (name_offset >= DynStrRegion.Size)
return object_error::parse_failed;
return StringRef(getDynamicString(name_offset));
}
projects / oota-llvm.git / blobdiff