#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<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 Elf_Hash_Impl<ELFT> Elf_Hash;
+ 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
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;
};
DynRegionInfo DynamicRegion;
- DynRegionInfo DynHashRegion;
+ DynRegionInfo DynStrRegion;
DynRegionInfo DynRelaRegion;
- // Pointer to SONAME entry in dynamic string table
- // This is set the first time getLoadName is called.
- mutable const char *dt_soname = nullptr;
+ // SONAME entry in dynamic string table
+ StringRef DTSoname;
// Records for each version index the corresponding Verdef or Vernaux entry.
// This is filled the first time LoadVersionMap() is called.
return make_range(symbol_begin(), symbol_end());
}
- 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 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));
+ const Elf_Dyn *dynamic_table_begin() const;
+ const Elf_Dyn *dynamic_table_end() const;
+ Elf_Dyn_Range dynamic_table() const {
+ return make_range(dynamic_table_begin(), dynamic_table_end());
}
const Elf_Sym *dynamic_symbol_begin() 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);
+ 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);
}
- Elf_Rela_Iter rela_begin(const Elf_Shdr *sec) const {
- return Elf_Rela_Iter(sec->sh_entsize,
- (const char *)(base() + sec->sh_offset));
+ typedef iterator_range<const Elf_Rela *> Elf_Rela_Range;
+
+ Elf_Rela_Range dyn_relas() const {
+ return make_range(dyn_rela_begin(), dyn_rela_end());
+ }
+
+ 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);
+ }
+
+ 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_Rela_Range relas(const Elf_Shdr *Sec) const {
+ return make_range(rela_begin(Sec), rela_end(Sec));
}
- 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_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);
}
- Elf_Rel_Iter rel_begin(const Elf_Shdr *sec) const {
- return Elf_Rel_Iter(sec->sh_entsize,
- (const char *)(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);
}
- 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));
+ 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;
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) {
- // 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) {
// More than one .gnu.version section!
}
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);
+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;
continue;
}
- if (PhdrI->p_type != ELF::PT_LOAD)
- continue;
- if (PhdrI->p_filesz == 0)
+ if (Phdr.p_type != ELF::PT_LOAD || Phdr.p_filesz == 0)
continue;
- LoadMap.insert(PhdrI->p_vaddr, PhdrI->p_vaddr + PhdrI->p_filesz,
- PhdrI->p_offset);
+ LoadSegments.push_back(&Phdr);
}
auto toMappedAddr = [&](uint64_t VAddr) -> const uint8_t * {
- auto I = LoadMap.find(VAddr);
- if (I == LoadMap.end())
- return nullptr;
- return base() + I.value() + (VAddr - I.start());
+ 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) {
+ uint64_t SONameOffset = 0;
+ for (const Elf_Dyn &Dyn : dynamic_table()) {
+ switch (Dyn.d_tag) {
case ELF::DT_HASH:
if (HashTable)
continue;
HashTable =
- reinterpret_cast<const Elf_Hash *>(toMappedAddr(DynI->getPtr()));
+ reinterpret_cast<const Elf_Hash *>(toMappedAddr(Dyn.getPtr()));
+ break;
+ case ELF::DT_STRTAB:
+ if (!DynStrRegion.Addr)
+ DynStrRegion.Addr = toMappedAddr(Dyn.getPtr());
+ break;
+ case ELF::DT_STRSZ:
+ if (!DynStrRegion.Size)
+ DynStrRegion.Size = Dyn.getVal();
break;
case ELF::DT_RELA:
if (!DynRelaRegion.Addr)
- DynRelaRegion.Addr = toMappedAddr(DynI->getPtr());
+ DynRelaRegion.Addr = toMappedAddr(Dyn.getPtr());
break;
case ELF::DT_RELASZ:
- DynRelaRegion.Size = DynI->getVal();
+ DynRelaRegion.Size = Dyn.getVal();
break;
case ELF::DT_RELAENT:
- DynRelaRegion.EntSize = DynI->getVal();
+ DynRelaRegion.EntSize = Dyn.getVal();
+ break;
+ case ELF::DT_SONAME:
+ SONameOffset = Dyn.getVal();
+ break;
}
}
+ if (SONameOffset)
+ DTSoname = getDynamicString(SONameOffset);
}
template <class ELFT>
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Dyn_Iter
+const typename ELFFile<ELFT>::Elf_Dyn *
ELFFile<ELFT>::dynamic_table_begin() const {
- if (DynamicRegion.Addr)
- return Elf_Dyn_Iter(DynamicRegion.EntSize,
- (const char *)DynamicRegion.Addr);
- return Elf_Dyn_Iter(0, nullptr);
+ return reinterpret_cast<const Elf_Dyn *>(DynamicRegion.Addr);
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Dyn_Iter
-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 = dynamic_table_begin();
- while (Start != Ret && Start->getTag() != ELF::DT_NULL)
- ++Start;
-
- // Include the DT_NULL.
- if (Start != Ret)
- ++Start;
- Ret = Start;
- }
- return Ret;
+const typename ELFFile<ELFT>::Elf_Dyn *
+ELFFile<ELFT>::dynamic_table_end() const {
+ uint64_t Size = DynamicRegion.Size;
+ if (Size % sizeof(Elf_Dyn))
+ report_fatal_error("Invalid dynamic table size");
+
+ return dynamic_table_begin() + Size / sizeof(Elf_Dyn);
}
template <class ELFT>
StringRef ELFFile<ELFT>::getLoadName() const {
- if (!dt_soname) {
- dt_soname = "";
- // Find the DT_SONAME entry
- for (const auto &Entry : dynamic_table())
- if (Entry.getTag() == ELF::DT_SONAME) {
- dt_soname = getDynamicString(Entry.getVal());
- break;
- }
- }
- return dt_soname;
+ return DTSoname;
}
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));
}
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