#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"
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;
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 DynSymRegion;
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,
}
const Elf_Sym *dynamic_symbol_begin() const {
- if (!DynSymRegion.Addr)
+ if (!DotDynSymSec)
return nullptr;
- if (DynSymRegion.EntSize != sizeof(Elf_Sym))
+ if (DotDynSymSec->sh_entsize != sizeof(Elf_Sym))
report_fatal_error("Invalid symbol size");
- return reinterpret_cast<const Elf_Sym *>(DynSymRegion.Addr);
+ return reinterpret_cast<const Elf_Sym *>(base() + DotDynSymSec->sh_offset);
}
const Elf_Sym *dynamic_symbol_end() const {
- if (!DynSymRegion.Addr)
+ if (!DotDynSymSec)
return nullptr;
- return reinterpret_cast<const Elf_Sym *>(
- ((const char *)DynSymRegion.Addr + DynSymRegion.Size));
+ return reinterpret_cast<const Elf_Sym *>(base() + DotDynSymSec->sh_offset +
+ DotDynSymSec->sh_size);
}
Elf_Sym_Range dynamic_symbols() 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;
};
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?
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!
DotStrtab = *SymtabOrErr;
} break;
case ELF::SHT_DYNSYM: {
- if (DynSymRegion.Addr) {
+ if (DotDynSymSec) {
// More than one .dynsym!
EC = object_error::parse_failed;
return;
}
- DynSymRegion.Addr = base() + Sec.sh_offset;
- DynSymRegion.Size = Sec.sh_size;
- DynSymRegion.EntSize = Sec.sh_entsize;
- ErrorOr<const Elf_Shdr *> DynStrOrErr = getSection(Sec.sh_link);
- if ((EC = DynStrOrErr.getError()))
+ 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;
- const Elf_Shdr *DynStr = *DynStrOrErr;
- DynStrRegion.Addr = base() + DynStr->sh_offset;
- DynStrRegion.Size = DynStr->sh_size;
- DynStrRegion.EntSize = DynStr->sh_entsize;
+ DynSymStrTab = *SymtabOrErr;
break;
}
case ELF::SHT_DYNAMIC:
}
}
- // Scan 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) {
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);
}
- // Scan dynamic table.
+ 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());
+ };
+
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_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 (!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>
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.
}
// 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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