forked from OSchip/llvm-project
1554 lines
51 KiB
C++
1554 lines
51 KiB
C++
//===- OutputSections.cpp -------------------------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "OutputSections.h"
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#include "Config.h"
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#include "SymbolTable.h"
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#include "Target.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/MathExtras.h"
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#include <map>
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::support::endian;
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using namespace llvm::ELF;
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using namespace lld;
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using namespace lld::elf2;
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template <class ELFT>
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OutputSectionBase<ELFT>::OutputSectionBase(StringRef Name, uint32_t Type,
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uintX_t Flags)
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: Name(Name) {
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memset(&Header, 0, sizeof(Elf_Shdr));
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Header.sh_type = Type;
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Header.sh_flags = Flags;
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}
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template <class ELFT>
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GotPltSection<ELFT>::GotPltSection()
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: OutputSectionBase<ELFT>(".got.plt", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE) {
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this->Header.sh_addralign = sizeof(uintX_t);
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}
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template <class ELFT> void GotPltSection<ELFT>::addEntry(SymbolBody *Sym) {
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Sym->GotPltIndex = Target->GotPltHeaderEntriesNum + Entries.size();
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Entries.push_back(Sym);
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}
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template <class ELFT> bool GotPltSection<ELFT>::empty() const {
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return Entries.empty();
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}
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template <class ELFT> void GotPltSection<ELFT>::finalize() {
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this->Header.sh_size =
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(Target->GotPltHeaderEntriesNum + Entries.size()) * sizeof(uintX_t);
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}
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template <class ELFT> void GotPltSection<ELFT>::writeTo(uint8_t *Buf) {
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Target->writeGotPltHeader(Buf);
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Buf += Target->GotPltHeaderEntriesNum * sizeof(uintX_t);
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for (const SymbolBody *B : Entries) {
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Target->writeGotPlt(Buf, B->getPltVA<ELFT>());
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Buf += sizeof(uintX_t);
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}
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}
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template <class ELFT>
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GotSection<ELFT>::GotSection()
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: OutputSectionBase<ELFT>(".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE) {
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if (Config->EMachine == EM_MIPS)
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this->Header.sh_flags |= SHF_MIPS_GPREL;
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this->Header.sh_addralign = sizeof(uintX_t);
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}
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template <class ELFT> void GotSection<ELFT>::addEntry(SymbolBody *Sym) {
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Sym->GotIndex = Entries.size();
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Entries.push_back(Sym);
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}
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template <class ELFT> void GotSection<ELFT>::addMipsLocalEntry() {
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++MipsLocalEntries;
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}
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template <class ELFT> bool GotSection<ELFT>::addDynTlsEntry(SymbolBody *Sym) {
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if (Sym->hasGlobalDynIndex())
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return false;
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Sym->GlobalDynIndex = Target->GotHeaderEntriesNum + Entries.size();
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// Global Dynamic TLS entries take two GOT slots.
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Entries.push_back(Sym);
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Entries.push_back(nullptr);
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return true;
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}
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// Reserves TLS entries for a TLS module ID and a TLS block offset.
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// In total it takes two GOT slots.
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template <class ELFT> bool GotSection<ELFT>::addTlsIndex() {
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if (TlsIndexOff != uint32_t(-1))
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return false;
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TlsIndexOff = Entries.size() * sizeof(uintX_t);
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Entries.push_back(nullptr);
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Entries.push_back(nullptr);
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return true;
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}
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template <class ELFT>
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typename GotSection<ELFT>::uintX_t
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GotSection<ELFT>::getMipsLocalFullAddr(const SymbolBody &B) {
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return getMipsLocalEntryAddr(B.getVA<ELFT>());
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}
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template <class ELFT>
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typename GotSection<ELFT>::uintX_t
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GotSection<ELFT>::getMipsLocalPageAddr(uintX_t EntryValue) {
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// Initialize the entry by the %hi(EntryValue) expression
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// but without right-shifting.
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return getMipsLocalEntryAddr((EntryValue + 0x8000) & ~0xffff);
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}
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template <class ELFT>
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typename GotSection<ELFT>::uintX_t
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GotSection<ELFT>::getMipsLocalEntryAddr(uintX_t EntryValue) {
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size_t NewIndex = Target->GotHeaderEntriesNum + MipsLocalGotPos.size();
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auto P = MipsLocalGotPos.insert(std::make_pair(EntryValue, NewIndex));
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assert(!P.second || MipsLocalGotPos.size() <= MipsLocalEntries);
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return this->getVA() + P.first->second * sizeof(uintX_t);
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}
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template <class ELFT>
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typename GotSection<ELFT>::uintX_t
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GotSection<ELFT>::getGlobalDynAddr(const SymbolBody &B) const {
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return this->getVA() + B.GlobalDynIndex * sizeof(uintX_t);
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}
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template <class ELFT>
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const SymbolBody *GotSection<ELFT>::getMipsFirstGlobalEntry() const {
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return Entries.empty() ? nullptr : Entries.front();
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}
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template <class ELFT>
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unsigned GotSection<ELFT>::getMipsLocalEntriesNum() const {
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return Target->GotHeaderEntriesNum + MipsLocalEntries;
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}
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template <class ELFT> void GotSection<ELFT>::finalize() {
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this->Header.sh_size =
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(Target->GotHeaderEntriesNum + MipsLocalEntries + Entries.size()) *
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sizeof(uintX_t);
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}
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template <class ELFT> void GotSection<ELFT>::writeTo(uint8_t *Buf) {
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Target->writeGotHeader(Buf);
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for (std::pair<uintX_t, size_t> &L : MipsLocalGotPos) {
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uint8_t *Entry = Buf + L.second * sizeof(uintX_t);
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write<uintX_t, ELFT::TargetEndianness, sizeof(uintX_t)>(Entry, L.first);
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}
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Buf += Target->GotHeaderEntriesNum * sizeof(uintX_t);
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Buf += MipsLocalEntries * sizeof(uintX_t);
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for (const SymbolBody *B : Entries) {
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uint8_t *Entry = Buf;
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Buf += sizeof(uintX_t);
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if (!B)
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continue;
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// MIPS has special rules to fill up GOT entries.
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// See "Global Offset Table" in Chapter 5 in the following document
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// for detailed description:
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// ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf
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// As the first approach, we can just store addresses for all symbols.
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if (Config->EMachine != EM_MIPS && canBePreempted(B, false))
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continue; // The dynamic linker will take care of it.
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uintX_t VA = B->getVA<ELFT>();
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write<uintX_t, ELFT::TargetEndianness, sizeof(uintX_t)>(Entry, VA);
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}
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}
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template <class ELFT>
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PltSection<ELFT>::PltSection()
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: OutputSectionBase<ELFT>(".plt", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR) {
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this->Header.sh_addralign = 16;
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}
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template <class ELFT> void PltSection<ELFT>::writeTo(uint8_t *Buf) {
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size_t Off = 0;
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if (Target->UseLazyBinding) {
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// At beginning of PLT, we have code to call the dynamic linker
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// to resolve dynsyms at runtime. Write such code.
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Target->writePltZero(Buf);
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Off += Target->PltZeroSize;
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}
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for (auto &I : Entries) {
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const SymbolBody *B = I.first;
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unsigned RelOff = I.second;
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uint64_t Got =
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Target->UseLazyBinding ? B->getGotPltVA<ELFT>() : B->getGotVA<ELFT>();
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uint64_t Plt = this->getVA() + Off;
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Target->writePlt(Buf + Off, Got, Plt, B->PltIndex, RelOff);
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Off += Target->PltEntrySize;
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}
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}
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template <class ELFT> void PltSection<ELFT>::addEntry(SymbolBody *Sym) {
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Sym->PltIndex = Entries.size();
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unsigned RelOff = Target->UseLazyBinding
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? Out<ELFT>::RelaPlt->getRelocOffset()
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: Out<ELFT>::RelaDyn->getRelocOffset();
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Entries.push_back(std::make_pair(Sym, RelOff));
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}
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template <class ELFT> void PltSection<ELFT>::finalize() {
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this->Header.sh_size =
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Target->PltZeroSize + Entries.size() * Target->PltEntrySize;
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}
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template <class ELFT>
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RelocationSection<ELFT>::RelocationSection(StringRef Name, bool IsRela)
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: OutputSectionBase<ELFT>(Name, IsRela ? SHT_RELA : SHT_REL, SHF_ALLOC),
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IsRela(IsRela) {
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this->Header.sh_entsize = IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
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this->Header.sh_addralign = sizeof(uintX_t);
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}
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template <class ELFT>
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void RelocationSection<ELFT>::addReloc(const DynamicReloc<ELFT> &Reloc) {
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SymbolBody *Sym = Reloc.Sym;
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if (!Reloc.UseSymVA && Sym)
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Sym->setUsedInDynamicReloc();
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Relocs.push_back(Reloc);
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}
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template <class ELFT>
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static typename ELFFile<ELFT>::uintX_t
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getOffset(const DynamicReloc<ELFT> &Rel) {
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typedef typename ELFFile<ELFT>::uintX_t uintX_t;
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SymbolBody *Sym = Rel.Sym;
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switch (Rel.OKind) {
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case DynamicReloc<ELFT>::Off_GTlsIndex:
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return Out<ELFT>::Got->getGlobalDynAddr(*Sym);
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case DynamicReloc<ELFT>::Off_GTlsOffset:
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return Out<ELFT>::Got->getGlobalDynAddr(*Sym) + sizeof(uintX_t);
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case DynamicReloc<ELFT>::Off_LTlsIndex:
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return Out<ELFT>::Got->getTlsIndexVA();
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case DynamicReloc<ELFT>::Off_Sec:
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return Rel.OffsetSec->getOffset(Rel.OffsetInSec) +
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Rel.OffsetSec->OutSec->getVA();
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case DynamicReloc<ELFT>::Off_Bss:
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return cast<SharedSymbol<ELFT>>(Sym)->OffsetInBss + Out<ELFT>::Bss->getVA();
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case DynamicReloc<ELFT>::Off_Got:
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return Sym->getGotVA<ELFT>();
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case DynamicReloc<ELFT>::Off_GotPlt:
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return Sym->getGotPltVA<ELFT>();
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}
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llvm_unreachable("Invalid offset kind");
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}
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template <class ELFT> void RelocationSection<ELFT>::writeTo(uint8_t *Buf) {
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for (const DynamicReloc<ELFT> &Rel : Relocs) {
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auto *P = reinterpret_cast<Elf_Rel *>(Buf);
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Buf += IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
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SymbolBody *Sym = Rel.Sym;
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if (IsRela) {
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uintX_t VA = 0;
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if (Rel.UseSymVA)
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VA = Sym->getVA<ELFT>();
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else if (Rel.TargetSec)
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VA = Rel.TargetSec->getOffset(Rel.OffsetInTargetSec) +
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Rel.TargetSec->OutSec->getVA();
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reinterpret_cast<Elf_Rela *>(P)->r_addend = Rel.Addend + VA;
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}
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P->r_offset = getOffset(Rel);
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uint32_t SymIdx = (!Rel.UseSymVA && Sym) ? Sym->DynsymIndex : 0;
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P->setSymbolAndType(SymIdx, Rel.Type, Config->Mips64EL);
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}
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}
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template <class ELFT> unsigned RelocationSection<ELFT>::getRelocOffset() {
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const unsigned EntrySize = IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
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return EntrySize * Relocs.size();
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}
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template <class ELFT> void RelocationSection<ELFT>::finalize() {
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this->Header.sh_link = Static ? Out<ELFT>::SymTab->SectionIndex
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: Out<ELFT>::DynSymTab->SectionIndex;
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this->Header.sh_size = Relocs.size() * this->Header.sh_entsize;
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}
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template <class ELFT>
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InterpSection<ELFT>::InterpSection()
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: OutputSectionBase<ELFT>(".interp", SHT_PROGBITS, SHF_ALLOC) {
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this->Header.sh_size = Config->DynamicLinker.size() + 1;
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this->Header.sh_addralign = 1;
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}
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template <class ELFT>
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void OutputSectionBase<ELFT>::writeHeaderTo(Elf_Shdr *SHdr) {
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*SHdr = Header;
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}
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template <class ELFT> void InterpSection<ELFT>::writeTo(uint8_t *Buf) {
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memcpy(Buf, Config->DynamicLinker.data(), Config->DynamicLinker.size());
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}
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template <class ELFT>
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HashTableSection<ELFT>::HashTableSection()
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: OutputSectionBase<ELFT>(".hash", SHT_HASH, SHF_ALLOC) {
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this->Header.sh_entsize = sizeof(Elf_Word);
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this->Header.sh_addralign = sizeof(Elf_Word);
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}
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static uint32_t hashSysv(StringRef Name) {
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uint32_t H = 0;
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for (char C : Name) {
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H = (H << 4) + C;
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uint32_t G = H & 0xf0000000;
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if (G)
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H ^= G >> 24;
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H &= ~G;
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}
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return H;
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}
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template <class ELFT> void HashTableSection<ELFT>::finalize() {
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this->Header.sh_link = Out<ELFT>::DynSymTab->SectionIndex;
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unsigned NumEntries = 2; // nbucket and nchain.
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NumEntries += Out<ELFT>::DynSymTab->getNumSymbols(); // The chain entries.
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// Create as many buckets as there are symbols.
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// FIXME: This is simplistic. We can try to optimize it, but implementing
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// support for SHT_GNU_HASH is probably even more profitable.
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NumEntries += Out<ELFT>::DynSymTab->getNumSymbols();
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this->Header.sh_size = NumEntries * sizeof(Elf_Word);
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}
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template <class ELFT> void HashTableSection<ELFT>::writeTo(uint8_t *Buf) {
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unsigned NumSymbols = Out<ELFT>::DynSymTab->getNumSymbols();
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auto *P = reinterpret_cast<Elf_Word *>(Buf);
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*P++ = NumSymbols; // nbucket
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*P++ = NumSymbols; // nchain
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Elf_Word *Buckets = P;
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Elf_Word *Chains = P + NumSymbols;
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for (const std::pair<SymbolBody *, unsigned> &P :
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Out<ELFT>::DynSymTab->getSymbols()) {
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SymbolBody *Body = P.first;
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StringRef Name = Body->getName();
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unsigned I = Body->DynsymIndex;
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uint32_t Hash = hashSysv(Name) % NumSymbols;
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Chains[I] = Buckets[Hash];
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Buckets[Hash] = I;
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}
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}
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static uint32_t hashGnu(StringRef Name) {
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uint32_t H = 5381;
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for (uint8_t C : Name)
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H = (H << 5) + H + C;
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return H;
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}
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template <class ELFT>
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GnuHashTableSection<ELFT>::GnuHashTableSection()
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: OutputSectionBase<ELFT>(".gnu.hash", SHT_GNU_HASH, SHF_ALLOC) {
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this->Header.sh_entsize = ELFT::Is64Bits ? 0 : 4;
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this->Header.sh_addralign = sizeof(uintX_t);
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}
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template <class ELFT>
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unsigned GnuHashTableSection<ELFT>::calcNBuckets(unsigned NumHashed) {
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if (!NumHashed)
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return 0;
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// These values are prime numbers which are not greater than 2^(N-1) + 1.
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// In result, for any particular NumHashed we return a prime number
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// which is not greater than NumHashed.
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static const unsigned Primes[] = {
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1, 1, 3, 3, 7, 13, 31, 61, 127, 251,
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509, 1021, 2039, 4093, 8191, 16381, 32749, 65521, 131071};
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return Primes[std::min<unsigned>(Log2_32_Ceil(NumHashed),
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array_lengthof(Primes) - 1)];
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}
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// Bloom filter estimation: at least 8 bits for each hashed symbol.
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// GNU Hash table requirement: it should be a power of 2,
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// the minimum value is 1, even for an empty table.
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// Expected results for a 32-bit target:
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// calcMaskWords(0..4) = 1
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// calcMaskWords(5..8) = 2
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// calcMaskWords(9..16) = 4
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// For a 64-bit target:
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// calcMaskWords(0..8) = 1
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// calcMaskWords(9..16) = 2
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// calcMaskWords(17..32) = 4
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template <class ELFT>
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unsigned GnuHashTableSection<ELFT>::calcMaskWords(unsigned NumHashed) {
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if (!NumHashed)
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return 1;
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return NextPowerOf2((NumHashed - 1) / sizeof(Elf_Off));
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}
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template <class ELFT> void GnuHashTableSection<ELFT>::finalize() {
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unsigned NumHashed = HashedSymbols.size();
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NBuckets = calcNBuckets(NumHashed);
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MaskWords = calcMaskWords(NumHashed);
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// Second hash shift estimation: just predefined values.
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Shift2 = ELFT::Is64Bits ? 6 : 5;
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this->Header.sh_link = Out<ELFT>::DynSymTab->SectionIndex;
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this->Header.sh_size = sizeof(Elf_Word) * 4 // Header
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+ sizeof(Elf_Off) * MaskWords // Bloom Filter
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+ sizeof(Elf_Word) * NBuckets // Hash Buckets
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+ sizeof(Elf_Word) * NumHashed; // Hash Values
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}
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template <class ELFT> void GnuHashTableSection<ELFT>::writeTo(uint8_t *Buf) {
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writeHeader(Buf);
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if (HashedSymbols.empty())
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return;
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writeBloomFilter(Buf);
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writeHashTable(Buf);
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}
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template <class ELFT>
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void GnuHashTableSection<ELFT>::writeHeader(uint8_t *&Buf) {
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auto *P = reinterpret_cast<Elf_Word *>(Buf);
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*P++ = NBuckets;
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*P++ = Out<ELFT>::DynSymTab->getNumSymbols() - HashedSymbols.size();
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*P++ = MaskWords;
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*P++ = Shift2;
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Buf = reinterpret_cast<uint8_t *>(P);
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}
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template <class ELFT>
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void GnuHashTableSection<ELFT>::writeBloomFilter(uint8_t *&Buf) {
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unsigned C = sizeof(Elf_Off) * 8;
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auto *Masks = reinterpret_cast<Elf_Off *>(Buf);
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for (const HashedSymbolData &Item : HashedSymbols) {
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size_t Pos = (Item.Hash / C) & (MaskWords - 1);
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uintX_t V = (uintX_t(1) << (Item.Hash % C)) |
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(uintX_t(1) << ((Item.Hash >> Shift2) % C));
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Masks[Pos] |= V;
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}
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Buf += sizeof(Elf_Off) * MaskWords;
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}
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template <class ELFT>
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void GnuHashTableSection<ELFT>::writeHashTable(uint8_t *Buf) {
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Elf_Word *Buckets = reinterpret_cast<Elf_Word *>(Buf);
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Elf_Word *Values = Buckets + NBuckets;
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int PrevBucket = -1;
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int I = 0;
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|
for (const HashedSymbolData &Item : HashedSymbols) {
|
|
int Bucket = Item.Hash % NBuckets;
|
|
assert(PrevBucket <= Bucket);
|
|
if (Bucket != PrevBucket) {
|
|
Buckets[Bucket] = Item.Body->DynsymIndex;
|
|
PrevBucket = Bucket;
|
|
if (I > 0)
|
|
Values[I - 1] |= 1;
|
|
}
|
|
Values[I] = Item.Hash & ~1;
|
|
++I;
|
|
}
|
|
if (I > 0)
|
|
Values[I - 1] |= 1;
|
|
}
|
|
|
|
static bool includeInGnuHashTable(SymbolBody *B) {
|
|
// Assume that includeInDynsym() is already checked.
|
|
return !B->isUndefined();
|
|
}
|
|
|
|
template <class ELFT>
|
|
void GnuHashTableSection<ELFT>::addSymbols(
|
|
std::vector<std::pair<SymbolBody *, unsigned>> &Symbols) {
|
|
std::vector<std::pair<SymbolBody *, unsigned>> NotHashed;
|
|
NotHashed.reserve(Symbols.size());
|
|
HashedSymbols.reserve(Symbols.size());
|
|
for (const std::pair<SymbolBody *, unsigned> &P : Symbols) {
|
|
SymbolBody *B = P.first;
|
|
if (includeInGnuHashTable(B))
|
|
HashedSymbols.push_back(
|
|
HashedSymbolData{B, P.second, hashGnu(B->getName())});
|
|
else
|
|
NotHashed.push_back(P);
|
|
}
|
|
if (HashedSymbols.empty())
|
|
return;
|
|
|
|
unsigned NBuckets = calcNBuckets(HashedSymbols.size());
|
|
std::stable_sort(HashedSymbols.begin(), HashedSymbols.end(),
|
|
[&](const HashedSymbolData &L, const HashedSymbolData &R) {
|
|
return L.Hash % NBuckets < R.Hash % NBuckets;
|
|
});
|
|
|
|
Symbols = std::move(NotHashed);
|
|
for (const HashedSymbolData &Item : HashedSymbols)
|
|
Symbols.push_back(std::make_pair(Item.Body, Item.STName));
|
|
}
|
|
|
|
template <class ELFT>
|
|
DynamicSection<ELFT>::DynamicSection(SymbolTable<ELFT> &SymTab)
|
|
: OutputSectionBase<ELFT>(".dynamic", SHT_DYNAMIC, SHF_ALLOC | SHF_WRITE),
|
|
SymTab(SymTab) {
|
|
Elf_Shdr &Header = this->Header;
|
|
Header.sh_addralign = sizeof(uintX_t);
|
|
Header.sh_entsize = ELFT::Is64Bits ? 16 : 8;
|
|
|
|
// .dynamic section is not writable on MIPS.
|
|
// See "Special Section" in Chapter 4 in the following document:
|
|
// ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf
|
|
if (Config->EMachine == EM_MIPS)
|
|
Header.sh_flags = SHF_ALLOC;
|
|
}
|
|
|
|
template <class ELFT> void DynamicSection<ELFT>::finalize() {
|
|
if (this->Header.sh_size)
|
|
return; // Already finalized.
|
|
|
|
Elf_Shdr &Header = this->Header;
|
|
Header.sh_link = Out<ELFT>::DynStrTab->SectionIndex;
|
|
|
|
auto Add = [=](Entry E) { Entries.push_back(E); };
|
|
|
|
// Add strings. We know that these are the last strings to be added to
|
|
// DynStrTab and doing this here allows this function to set DT_STRSZ.
|
|
if (!Config->RPath.empty())
|
|
Add({Config->EnableNewDtags ? DT_RUNPATH : DT_RPATH,
|
|
Out<ELFT>::DynStrTab->addString(Config->RPath)});
|
|
for (const std::unique_ptr<SharedFile<ELFT>> &F : SymTab.getSharedFiles())
|
|
if (F->isNeeded())
|
|
Add({DT_NEEDED, Out<ELFT>::DynStrTab->addString(F->getSoName())});
|
|
if (!Config->SoName.empty())
|
|
Add({DT_SONAME, Out<ELFT>::DynStrTab->addString(Config->SoName)});
|
|
|
|
Out<ELFT>::DynStrTab->finalize();
|
|
|
|
if (Out<ELFT>::RelaDyn->hasRelocs()) {
|
|
bool IsRela = Out<ELFT>::RelaDyn->isRela();
|
|
Add({IsRela ? DT_RELA : DT_REL, Out<ELFT>::RelaDyn});
|
|
Add({IsRela ? DT_RELASZ : DT_RELSZ, Out<ELFT>::RelaDyn->getSize()});
|
|
Add({IsRela ? DT_RELAENT : DT_RELENT,
|
|
uintX_t(IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel))});
|
|
}
|
|
if (Out<ELFT>::RelaPlt && Out<ELFT>::RelaPlt->hasRelocs()) {
|
|
Add({DT_JMPREL, Out<ELFT>::RelaPlt});
|
|
Add({DT_PLTRELSZ, Out<ELFT>::RelaPlt->getSize()});
|
|
Add({Config->EMachine == EM_MIPS ? DT_MIPS_PLTGOT : DT_PLTGOT,
|
|
Out<ELFT>::GotPlt});
|
|
Add({DT_PLTREL, uint64_t(Out<ELFT>::RelaPlt->isRela() ? DT_RELA : DT_REL)});
|
|
}
|
|
|
|
Add({DT_SYMTAB, Out<ELFT>::DynSymTab});
|
|
Add({DT_SYMENT, sizeof(Elf_Sym)});
|
|
Add({DT_STRTAB, Out<ELFT>::DynStrTab});
|
|
Add({DT_STRSZ, Out<ELFT>::DynStrTab->getSize()});
|
|
if (Out<ELFT>::GnuHashTab)
|
|
Add({DT_GNU_HASH, Out<ELFT>::GnuHashTab});
|
|
if (Out<ELFT>::HashTab)
|
|
Add({DT_HASH, Out<ELFT>::HashTab});
|
|
|
|
if (PreInitArraySec) {
|
|
Add({DT_PREINIT_ARRAY, PreInitArraySec});
|
|
Add({DT_PREINIT_ARRAYSZ, PreInitArraySec->getSize()});
|
|
}
|
|
if (InitArraySec) {
|
|
Add({DT_INIT_ARRAY, InitArraySec});
|
|
Add({DT_INIT_ARRAYSZ, (uintX_t)InitArraySec->getSize()});
|
|
}
|
|
if (FiniArraySec) {
|
|
Add({DT_FINI_ARRAY, FiniArraySec});
|
|
Add({DT_FINI_ARRAYSZ, (uintX_t)FiniArraySec->getSize()});
|
|
}
|
|
|
|
if (SymbolBody *B = SymTab.find(Config->Init))
|
|
Add({DT_INIT, B});
|
|
if (SymbolBody *B = SymTab.find(Config->Fini))
|
|
Add({DT_FINI, B});
|
|
|
|
uint32_t DtFlags = 0;
|
|
uint32_t DtFlags1 = 0;
|
|
if (Config->Bsymbolic)
|
|
DtFlags |= DF_SYMBOLIC;
|
|
if (Config->ZNodelete)
|
|
DtFlags1 |= DF_1_NODELETE;
|
|
if (Config->ZNow) {
|
|
DtFlags |= DF_BIND_NOW;
|
|
DtFlags1 |= DF_1_NOW;
|
|
}
|
|
if (Config->ZOrigin) {
|
|
DtFlags |= DF_ORIGIN;
|
|
DtFlags1 |= DF_1_ORIGIN;
|
|
}
|
|
|
|
if (DtFlags)
|
|
Add({DT_FLAGS, DtFlags});
|
|
if (DtFlags1)
|
|
Add({DT_FLAGS_1, DtFlags1});
|
|
|
|
if (!Config->Entry.empty())
|
|
Add({DT_DEBUG, (uint64_t)0});
|
|
|
|
if (Config->EMachine == EM_MIPS) {
|
|
Add({DT_MIPS_RLD_VERSION, 1});
|
|
Add({DT_MIPS_FLAGS, RHF_NOTPOT});
|
|
Add({DT_MIPS_BASE_ADDRESS, (uintX_t)Target->getVAStart()});
|
|
Add({DT_MIPS_SYMTABNO, Out<ELFT>::DynSymTab->getNumSymbols()});
|
|
Add({DT_MIPS_LOCAL_GOTNO, Out<ELFT>::Got->getMipsLocalEntriesNum()});
|
|
if (const SymbolBody *B = Out<ELFT>::Got->getMipsFirstGlobalEntry())
|
|
Add({DT_MIPS_GOTSYM, B->DynsymIndex});
|
|
else
|
|
Add({DT_MIPS_GOTSYM, Out<ELFT>::DynSymTab->getNumSymbols()});
|
|
Add({DT_PLTGOT, Out<ELFT>::Got});
|
|
if (Out<ELFT>::MipsRldMap)
|
|
Add({DT_MIPS_RLD_MAP, Out<ELFT>::MipsRldMap});
|
|
}
|
|
|
|
// +1 for DT_NULL
|
|
Header.sh_size = (Entries.size() + 1) * Header.sh_entsize;
|
|
}
|
|
|
|
template <class ELFT> void DynamicSection<ELFT>::writeTo(uint8_t *Buf) {
|
|
auto *P = reinterpret_cast<Elf_Dyn *>(Buf);
|
|
|
|
for (const Entry &E : Entries) {
|
|
P->d_tag = E.Tag;
|
|
switch (E.Kind) {
|
|
case Entry::SecAddr:
|
|
P->d_un.d_ptr = E.OutSec->getVA();
|
|
break;
|
|
case Entry::SymAddr:
|
|
P->d_un.d_ptr = E.Sym->template getVA<ELFT>();
|
|
break;
|
|
case Entry::PlainInt:
|
|
P->d_un.d_val = E.Val;
|
|
break;
|
|
}
|
|
++P;
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
EhFrameHeader<ELFT>::EhFrameHeader()
|
|
: OutputSectionBase<ELFT>(".eh_frame_hdr", llvm::ELF::SHT_PROGBITS,
|
|
SHF_ALLOC) {
|
|
// It's a 4 bytes of header + pointer to the contents of the .eh_frame section
|
|
// + the number of FDE pointers in the table.
|
|
this->Header.sh_size = 12;
|
|
}
|
|
|
|
// We have to get PC values of FDEs. They depend on relocations
|
|
// which are target specific, so we run this code after performing
|
|
// all relocations. We read the values from ouput buffer according to the
|
|
// encoding given for FDEs. Return value is an offset to the initial PC value
|
|
// for the FDE.
|
|
template <class ELFT>
|
|
typename EhFrameHeader<ELFT>::uintX_t
|
|
EhFrameHeader<ELFT>::getFdePc(uintX_t EhVA, const FdeData &F) {
|
|
const endianness E = ELFT::TargetEndianness;
|
|
assert((F.Enc & 0xF0) != dwarf::DW_EH_PE_datarel);
|
|
|
|
uintX_t FdeOff = EhVA + F.Off + 8;
|
|
switch (F.Enc & 0xF) {
|
|
case dwarf::DW_EH_PE_udata2:
|
|
case dwarf::DW_EH_PE_sdata2:
|
|
return FdeOff + read16<E>(F.PCRel);
|
|
case dwarf::DW_EH_PE_udata4:
|
|
case dwarf::DW_EH_PE_sdata4:
|
|
return FdeOff + read32<E>(F.PCRel);
|
|
case dwarf::DW_EH_PE_udata8:
|
|
case dwarf::DW_EH_PE_sdata8:
|
|
return FdeOff + read64<E>(F.PCRel);
|
|
case dwarf::DW_EH_PE_absptr:
|
|
if (sizeof(uintX_t) == 8)
|
|
return FdeOff + read64<E>(F.PCRel);
|
|
return FdeOff + read32<E>(F.PCRel);
|
|
}
|
|
fatal("unknown FDE size encoding");
|
|
}
|
|
|
|
template <class ELFT> void EhFrameHeader<ELFT>::writeTo(uint8_t *Buf) {
|
|
const endianness E = ELFT::TargetEndianness;
|
|
|
|
const uint8_t Header[] = {1, dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4,
|
|
dwarf::DW_EH_PE_udata4,
|
|
dwarf::DW_EH_PE_datarel | dwarf::DW_EH_PE_sdata4};
|
|
memcpy(Buf, Header, sizeof(Header));
|
|
|
|
uintX_t EhVA = Sec->getVA();
|
|
uintX_t VA = this->getVA();
|
|
uintX_t EhOff = EhVA - VA - 4;
|
|
write32<E>(Buf + 4, EhOff);
|
|
write32<E>(Buf + 8, this->FdeList.size());
|
|
Buf += 12;
|
|
|
|
// InitialPC -> Offset in .eh_frame, sorted by InitialPC.
|
|
std::map<uintX_t, size_t> PcToOffset;
|
|
for (const FdeData &F : FdeList)
|
|
PcToOffset[getFdePc(EhVA, F)] = F.Off;
|
|
|
|
for (auto &I : PcToOffset) {
|
|
// The first four bytes are an offset to the initial PC value for the FDE.
|
|
write32<E>(Buf, I.first - VA);
|
|
// The last four bytes are an offset to the FDE data itself.
|
|
write32<E>(Buf + 4, EhVA + I.second - VA);
|
|
Buf += 8;
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
void EhFrameHeader<ELFT>::assignEhFrame(EHOutputSection<ELFT> *Sec) {
|
|
assert((!this->Sec || this->Sec == Sec) &&
|
|
"multiple .eh_frame sections not supported for .eh_frame_hdr");
|
|
Live = Config->EhFrameHdr;
|
|
this->Sec = Sec;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void EhFrameHeader<ELFT>::addFde(uint8_t Enc, size_t Off, uint8_t *PCRel) {
|
|
if (Live && (Enc & 0xF0) == dwarf::DW_EH_PE_datarel)
|
|
fatal("DW_EH_PE_datarel encoding unsupported for FDEs by .eh_frame_hdr");
|
|
FdeList.push_back(FdeData{Enc, Off, PCRel});
|
|
}
|
|
|
|
template <class ELFT> void EhFrameHeader<ELFT>::reserveFde() {
|
|
// Each FDE entry is 8 bytes long:
|
|
// The first four bytes are an offset to the initial PC value for the FDE. The
|
|
// last four byte are an offset to the FDE data itself.
|
|
this->Header.sh_size += 8;
|
|
}
|
|
|
|
template <class ELFT>
|
|
OutputSection<ELFT>::OutputSection(StringRef Name, uint32_t Type,
|
|
uintX_t Flags)
|
|
: OutputSectionBase<ELFT>(Name, Type, Flags) {}
|
|
|
|
template <class ELFT>
|
|
void OutputSection<ELFT>::addSection(InputSectionBase<ELFT> *C) {
|
|
auto *S = cast<InputSection<ELFT>>(C);
|
|
Sections.push_back(S);
|
|
S->OutSec = this;
|
|
uint32_t Align = S->getAlign();
|
|
this->updateAlign(Align);
|
|
|
|
uintX_t Off = this->Header.sh_size;
|
|
Off = alignTo(Off, Align);
|
|
S->OutSecOff = Off;
|
|
Off += S->getSize();
|
|
this->Header.sh_size = Off;
|
|
}
|
|
|
|
// Returns a VA which a relocatin RI refers to. Used only for local symbols.
|
|
// For non-local symbols, use SymbolBody::getVA instead.
|
|
template <class ELFT, bool IsRela>
|
|
typename ELFFile<ELFT>::uintX_t
|
|
elf2::getLocalRelTarget(const ObjectFile<ELFT> &File,
|
|
const Elf_Rel_Impl<ELFT, IsRela> &RI,
|
|
typename ELFFile<ELFT>::uintX_t Addend) {
|
|
typedef typename ELFFile<ELFT>::Elf_Sym Elf_Sym;
|
|
typedef typename ELFFile<ELFT>::uintX_t uintX_t;
|
|
|
|
// PPC64 has a special relocation representing the TOC base pointer
|
|
// that does not have a corresponding symbol.
|
|
if (Config->EMachine == EM_PPC64 && RI.getType(false) == R_PPC64_TOC)
|
|
return getPPC64TocBase() + Addend;
|
|
|
|
const Elf_Sym *Sym =
|
|
File.getObj().getRelocationSymbol(&RI, File.getSymbolTable());
|
|
|
|
if (!Sym)
|
|
fatal("Unsupported relocation without symbol");
|
|
|
|
InputSectionBase<ELFT> *Section = File.getSection(*Sym);
|
|
|
|
if (Sym->getType() == STT_TLS)
|
|
return (Section->OutSec->getVA() + Section->getOffset(*Sym) + Addend) -
|
|
Out<ELFT>::TlsPhdr->p_vaddr;
|
|
|
|
// According to the ELF spec reference to a local symbol from outside
|
|
// the group are not allowed. Unfortunately .eh_frame breaks that rule
|
|
// and must be treated specially. For now we just replace the symbol with
|
|
// 0.
|
|
if (Section == &InputSection<ELFT>::Discarded || !Section->isLive())
|
|
return Addend;
|
|
|
|
uintX_t Offset = Sym->st_value;
|
|
if (Sym->getType() == STT_SECTION) {
|
|
Offset += Addend;
|
|
Addend = 0;
|
|
}
|
|
return Section->OutSec->getVA() + Section->getOffset(Offset) + Addend;
|
|
}
|
|
|
|
// Returns true if a symbol can be replaced at load-time by a symbol
|
|
// with the same name defined in other ELF executable or DSO.
|
|
bool elf2::canBePreempted(const SymbolBody *Body, bool NeedsGot) {
|
|
if (!Body)
|
|
return false; // Body is a local symbol.
|
|
if (Body->isShared())
|
|
return true;
|
|
|
|
if (Body->isUndefined()) {
|
|
if (!Body->isWeak())
|
|
return true;
|
|
|
|
// This is an horrible corner case. Ideally we would like to say that any
|
|
// undefined symbol can be preempted so that the dynamic linker has a
|
|
// chance of finding it at runtime.
|
|
//
|
|
// The problem is that the code sequence used to test for weak undef
|
|
// functions looks like
|
|
// if (func) func()
|
|
// If the code is -fPIC the first reference is a load from the got and
|
|
// everything works.
|
|
// If the code is not -fPIC there is no reasonable way to solve it:
|
|
// * A relocation writing to the text segment will fail (it is ro).
|
|
// * A copy relocation doesn't work for functions.
|
|
// * The trick of using a plt entry as the address would fail here since
|
|
// the plt entry would have a non zero address.
|
|
// Since we cannot do anything better, we just resolve the symbol to 0 and
|
|
// don't produce a dynamic relocation.
|
|
//
|
|
// As an extra hack, assume that if we are producing a shared library the
|
|
// user knows what he or she is doing and can handle a dynamic relocation.
|
|
return Config->Shared || NeedsGot;
|
|
}
|
|
if (!Config->Shared)
|
|
return false;
|
|
if (Body->getVisibility() != STV_DEFAULT)
|
|
return false;
|
|
if (Config->Bsymbolic || (Config->BsymbolicFunctions && Body->isFunc()))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
template <class ELFT> void OutputSection<ELFT>::writeTo(uint8_t *Buf) {
|
|
for (InputSection<ELFT> *C : Sections)
|
|
C->writeTo(Buf);
|
|
}
|
|
|
|
template <class ELFT>
|
|
EHOutputSection<ELFT>::EHOutputSection(StringRef Name, uint32_t Type,
|
|
uintX_t Flags)
|
|
: OutputSectionBase<ELFT>(Name, Type, Flags) {
|
|
Out<ELFT>::EhFrameHdr->assignEhFrame(this);
|
|
}
|
|
|
|
template <class ELFT>
|
|
EHRegion<ELFT>::EHRegion(EHInputSection<ELFT> *S, unsigned Index)
|
|
: S(S), Index(Index) {}
|
|
|
|
template <class ELFT> StringRef EHRegion<ELFT>::data() const {
|
|
ArrayRef<uint8_t> SecData = S->getSectionData();
|
|
ArrayRef<std::pair<uintX_t, uintX_t>> Offsets = S->Offsets;
|
|
size_t Start = Offsets[Index].first;
|
|
size_t End =
|
|
Index == Offsets.size() - 1 ? SecData.size() : Offsets[Index + 1].first;
|
|
return StringRef((const char *)SecData.data() + Start, End - Start);
|
|
}
|
|
|
|
template <class ELFT>
|
|
Cie<ELFT>::Cie(EHInputSection<ELFT> *S, unsigned Index)
|
|
: EHRegion<ELFT>(S, Index) {}
|
|
|
|
// Read a byte and advance D by one byte.
|
|
static uint8_t readByte(ArrayRef<uint8_t> &D) {
|
|
if (D.empty())
|
|
fatal("corrupted or unsupported CIE information");
|
|
uint8_t B = D.front();
|
|
D = D.slice(1);
|
|
return B;
|
|
}
|
|
|
|
static void skipLeb128(ArrayRef<uint8_t> &D) {
|
|
while (!D.empty()) {
|
|
uint8_t Val = D.front();
|
|
D = D.slice(1);
|
|
if ((Val & 0x80) == 0)
|
|
return;
|
|
}
|
|
fatal("corrupted or unsupported CIE information");
|
|
}
|
|
|
|
template <class ELFT> static unsigned getSizeForEncoding(unsigned Enc) {
|
|
typedef typename ELFFile<ELFT>::uintX_t uintX_t;
|
|
switch (Enc & 0x0f) {
|
|
default:
|
|
fatal("unknown FDE encoding");
|
|
case dwarf::DW_EH_PE_absptr:
|
|
case dwarf::DW_EH_PE_signed:
|
|
return sizeof(uintX_t);
|
|
case dwarf::DW_EH_PE_udata2:
|
|
case dwarf::DW_EH_PE_sdata2:
|
|
return 2;
|
|
case dwarf::DW_EH_PE_udata4:
|
|
case dwarf::DW_EH_PE_sdata4:
|
|
return 4;
|
|
case dwarf::DW_EH_PE_udata8:
|
|
case dwarf::DW_EH_PE_sdata8:
|
|
return 8;
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
uint8_t EHOutputSection<ELFT>::getFdeEncoding(ArrayRef<uint8_t> D) {
|
|
auto Check = [](bool C) {
|
|
if (!C)
|
|
fatal("corrupted or unsupported CIE information");
|
|
};
|
|
|
|
Check(D.size() >= 8);
|
|
D = D.slice(8);
|
|
|
|
uint8_t Version = readByte(D);
|
|
if (Version != 1 && Version != 3)
|
|
fatal("FDE version 1 or 3 expected, but got " + Twine((unsigned)Version));
|
|
|
|
auto AugEnd = std::find(D.begin() + 1, D.end(), '\0');
|
|
Check(AugEnd != D.end());
|
|
ArrayRef<uint8_t> AugString(D.begin(), AugEnd - D.begin());
|
|
D = D.slice(AugString.size() + 1);
|
|
|
|
// Code alignment factor should always be 1 for .eh_frame.
|
|
if (readByte(D) != 1)
|
|
fatal("CIE code alignment must be 1");
|
|
// Skip data alignment factor
|
|
skipLeb128(D);
|
|
|
|
// Skip the return address register. In CIE version 1 this is a single
|
|
// byte. In CIE version 3 this is an unsigned LEB128.
|
|
if (Version == 1)
|
|
readByte(D);
|
|
else
|
|
skipLeb128(D);
|
|
|
|
while (!AugString.empty()) {
|
|
switch (readByte(AugString)) {
|
|
case 'z':
|
|
skipLeb128(D);
|
|
break;
|
|
case 'R':
|
|
return readByte(D);
|
|
case 'P': {
|
|
uint8_t Enc = readByte(D);
|
|
if ((Enc & 0xf0) == dwarf::DW_EH_PE_aligned)
|
|
fatal("DW_EH_PE_aligned encoding for address of a personality routine "
|
|
"handler not supported");
|
|
unsigned EncSize = getSizeForEncoding<ELFT>(Enc);
|
|
Check(D.size() >= EncSize);
|
|
D = D.slice(EncSize);
|
|
break;
|
|
}
|
|
case 'S':
|
|
case 'L':
|
|
// L: Language Specific Data Area (LSDA) encoding
|
|
// S: This CIE represents a stack frame for the invocation of a signal
|
|
// handler
|
|
break;
|
|
default:
|
|
fatal("unknown .eh_frame augmentation string value");
|
|
}
|
|
}
|
|
return dwarf::DW_EH_PE_absptr;
|
|
}
|
|
|
|
template <class ELFT>
|
|
template <bool IsRela>
|
|
void EHOutputSection<ELFT>::addSectionAux(
|
|
EHInputSection<ELFT> *S,
|
|
iterator_range<const Elf_Rel_Impl<ELFT, IsRela> *> Rels) {
|
|
const endianness E = ELFT::TargetEndianness;
|
|
|
|
S->OutSec = this;
|
|
this->updateAlign(S->getAlign());
|
|
Sections.push_back(S);
|
|
|
|
ArrayRef<uint8_t> SecData = S->getSectionData();
|
|
ArrayRef<uint8_t> D = SecData;
|
|
uintX_t Offset = 0;
|
|
auto RelI = Rels.begin();
|
|
auto RelE = Rels.end();
|
|
|
|
DenseMap<unsigned, unsigned> OffsetToIndex;
|
|
while (!D.empty()) {
|
|
unsigned Index = S->Offsets.size();
|
|
S->Offsets.push_back(std::make_pair(Offset, -1));
|
|
|
|
uintX_t Length = readEntryLength(D);
|
|
// If CIE/FDE data length is zero then Length is 4, this
|
|
// shall be considered a terminator and processing shall end.
|
|
if (Length == 4)
|
|
break;
|
|
StringRef Entry((const char *)D.data(), Length);
|
|
|
|
while (RelI != RelE && RelI->r_offset < Offset)
|
|
++RelI;
|
|
uintX_t NextOffset = Offset + Length;
|
|
bool HasReloc = RelI != RelE && RelI->r_offset < NextOffset;
|
|
|
|
uint32_t ID = read32<E>(D.data() + 4);
|
|
if (ID == 0) {
|
|
// CIE
|
|
Cie<ELFT> C(S, Index);
|
|
if (Config->EhFrameHdr)
|
|
C.FdeEncoding = getFdeEncoding(D);
|
|
|
|
StringRef Personality;
|
|
if (HasReloc) {
|
|
uint32_t SymIndex = RelI->getSymbol(Config->Mips64EL);
|
|
SymbolBody &Body = *S->getFile()->getSymbolBody(SymIndex)->repl();
|
|
Personality = Body.getName();
|
|
}
|
|
|
|
std::pair<StringRef, StringRef> CieInfo(Entry, Personality);
|
|
auto P = CieMap.insert(std::make_pair(CieInfo, Cies.size()));
|
|
if (P.second) {
|
|
Cies.push_back(C);
|
|
this->Header.sh_size += alignTo(Length, sizeof(uintX_t));
|
|
}
|
|
OffsetToIndex[Offset] = P.first->second;
|
|
} else {
|
|
if (!HasReloc)
|
|
fatal("FDE doesn't reference another section");
|
|
InputSectionBase<ELFT> *Target = S->getRelocTarget(*RelI);
|
|
if (Target != &InputSection<ELFT>::Discarded && Target->isLive()) {
|
|
uint32_t CieOffset = Offset + 4 - ID;
|
|
auto I = OffsetToIndex.find(CieOffset);
|
|
if (I == OffsetToIndex.end())
|
|
fatal("Invalid CIE reference");
|
|
Cies[I->second].Fdes.push_back(EHRegion<ELFT>(S, Index));
|
|
Out<ELFT>::EhFrameHdr->reserveFde();
|
|
this->Header.sh_size += alignTo(Length, sizeof(uintX_t));
|
|
}
|
|
}
|
|
|
|
Offset = NextOffset;
|
|
D = D.slice(Length);
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
typename EHOutputSection<ELFT>::uintX_t
|
|
EHOutputSection<ELFT>::readEntryLength(ArrayRef<uint8_t> D) {
|
|
const endianness E = ELFT::TargetEndianness;
|
|
|
|
if (D.size() < 4)
|
|
fatal("Truncated CIE/FDE length");
|
|
uint64_t Len = read32<E>(D.data());
|
|
if (Len < UINT32_MAX) {
|
|
if (Len > (UINT32_MAX - 4))
|
|
fatal("CIE/FIE size is too large");
|
|
if (Len + 4 > D.size())
|
|
fatal("CIE/FIE ends past the end of the section");
|
|
return Len + 4;
|
|
}
|
|
|
|
if (D.size() < 12)
|
|
fatal("Truncated CIE/FDE length");
|
|
Len = read64<E>(D.data() + 4);
|
|
if (Len > (UINT64_MAX - 12))
|
|
fatal("CIE/FIE size is too large");
|
|
if (Len + 12 > D.size())
|
|
fatal("CIE/FIE ends past the end of the section");
|
|
return Len + 12;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void EHOutputSection<ELFT>::addSection(InputSectionBase<ELFT> *C) {
|
|
auto *S = cast<EHInputSection<ELFT>>(C);
|
|
const Elf_Shdr *RelSec = S->RelocSection;
|
|
if (!RelSec) {
|
|
addSectionAux(S, make_range<const Elf_Rela *>(nullptr, nullptr));
|
|
return;
|
|
}
|
|
ELFFile<ELFT> &Obj = S->getFile()->getObj();
|
|
if (RelSec->sh_type == SHT_RELA)
|
|
addSectionAux(S, Obj.relas(RelSec));
|
|
else
|
|
addSectionAux(S, Obj.rels(RelSec));
|
|
}
|
|
|
|
template <class ELFT>
|
|
static typename ELFFile<ELFT>::uintX_t writeAlignedCieOrFde(StringRef Data,
|
|
uint8_t *Buf) {
|
|
typedef typename ELFFile<ELFT>::uintX_t uintX_t;
|
|
const endianness E = ELFT::TargetEndianness;
|
|
uint64_t Len = alignTo(Data.size(), sizeof(uintX_t));
|
|
write32<E>(Buf, Len - 4);
|
|
memcpy(Buf + 4, Data.data() + 4, Data.size() - 4);
|
|
return Len;
|
|
}
|
|
|
|
template <class ELFT> void EHOutputSection<ELFT>::writeTo(uint8_t *Buf) {
|
|
const endianness E = ELFT::TargetEndianness;
|
|
size_t Offset = 0;
|
|
for (const Cie<ELFT> &C : Cies) {
|
|
size_t CieOffset = Offset;
|
|
|
|
uintX_t CIELen = writeAlignedCieOrFde<ELFT>(C.data(), Buf + Offset);
|
|
C.S->Offsets[C.Index].second = Offset;
|
|
Offset += CIELen;
|
|
|
|
for (const EHRegion<ELFT> &F : C.Fdes) {
|
|
uintX_t Len = writeAlignedCieOrFde<ELFT>(F.data(), Buf + Offset);
|
|
write32<E>(Buf + Offset + 4, Offset + 4 - CieOffset); // Pointer
|
|
F.S->Offsets[F.Index].second = Offset;
|
|
Out<ELFT>::EhFrameHdr->addFde(C.FdeEncoding, Offset, Buf + Offset + 8);
|
|
Offset += Len;
|
|
}
|
|
}
|
|
|
|
for (EHInputSection<ELFT> *S : Sections) {
|
|
const Elf_Shdr *RelSec = S->RelocSection;
|
|
if (!RelSec)
|
|
continue;
|
|
ELFFile<ELFT> &EObj = S->getFile()->getObj();
|
|
if (RelSec->sh_type == SHT_RELA)
|
|
S->relocate(Buf, nullptr, EObj.relas(RelSec));
|
|
else
|
|
S->relocate(Buf, nullptr, EObj.rels(RelSec));
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
MergeOutputSection<ELFT>::MergeOutputSection(StringRef Name, uint32_t Type,
|
|
uintX_t Flags)
|
|
: OutputSectionBase<ELFT>(Name, Type, Flags) {}
|
|
|
|
template <class ELFT> void MergeOutputSection<ELFT>::writeTo(uint8_t *Buf) {
|
|
if (shouldTailMerge()) {
|
|
StringRef Data = Builder.data();
|
|
memcpy(Buf, Data.data(), Data.size());
|
|
return;
|
|
}
|
|
for (const std::pair<StringRef, size_t> &P : Builder.getMap()) {
|
|
StringRef Data = P.first;
|
|
memcpy(Buf + P.second, Data.data(), Data.size());
|
|
}
|
|
}
|
|
|
|
static size_t findNull(StringRef S, size_t EntSize) {
|
|
// Optimize the common case.
|
|
if (EntSize == 1)
|
|
return S.find(0);
|
|
|
|
for (unsigned I = 0, N = S.size(); I != N; I += EntSize) {
|
|
const char *B = S.begin() + I;
|
|
if (std::all_of(B, B + EntSize, [](char C) { return C == 0; }))
|
|
return I;
|
|
}
|
|
return StringRef::npos;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void MergeOutputSection<ELFT>::addSection(InputSectionBase<ELFT> *C) {
|
|
auto *S = cast<MergeInputSection<ELFT>>(C);
|
|
S->OutSec = this;
|
|
this->updateAlign(S->getAlign());
|
|
|
|
ArrayRef<uint8_t> D = S->getSectionData();
|
|
StringRef Data((const char *)D.data(), D.size());
|
|
uintX_t EntSize = S->getSectionHdr()->sh_entsize;
|
|
|
|
// If this is of type string, the contents are null-terminated strings.
|
|
if (this->Header.sh_flags & SHF_STRINGS) {
|
|
uintX_t Offset = 0;
|
|
while (!Data.empty()) {
|
|
size_t End = findNull(Data, EntSize);
|
|
if (End == StringRef::npos)
|
|
fatal("String is not null terminated");
|
|
StringRef Entry = Data.substr(0, End + EntSize);
|
|
uintX_t OutputOffset = Builder.add(Entry);
|
|
if (shouldTailMerge())
|
|
OutputOffset = -1;
|
|
S->Offsets.push_back(std::make_pair(Offset, OutputOffset));
|
|
uintX_t Size = End + EntSize;
|
|
Data = Data.substr(Size);
|
|
Offset += Size;
|
|
}
|
|
return;
|
|
}
|
|
|
|
// If this is not of type string, every entry has the same size.
|
|
for (unsigned I = 0, N = Data.size(); I != N; I += EntSize) {
|
|
StringRef Entry = Data.substr(I, EntSize);
|
|
size_t OutputOffset = Builder.add(Entry);
|
|
S->Offsets.push_back(std::make_pair(I, OutputOffset));
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
unsigned MergeOutputSection<ELFT>::getOffset(StringRef Val) {
|
|
return Builder.getOffset(Val);
|
|
}
|
|
|
|
template <class ELFT> bool MergeOutputSection<ELFT>::shouldTailMerge() const {
|
|
return Config->Optimize >= 2 && this->Header.sh_flags & SHF_STRINGS;
|
|
}
|
|
|
|
template <class ELFT> void MergeOutputSection<ELFT>::finalize() {
|
|
if (shouldTailMerge())
|
|
Builder.finalize();
|
|
this->Header.sh_size = Builder.getSize();
|
|
}
|
|
|
|
template <class ELFT>
|
|
StringTableSection<ELFT>::StringTableSection(StringRef Name, bool Dynamic)
|
|
: OutputSectionBase<ELFT>(Name, SHT_STRTAB,
|
|
Dynamic ? (uintX_t)SHF_ALLOC : 0),
|
|
Dynamic(Dynamic) {
|
|
this->Header.sh_addralign = 1;
|
|
}
|
|
|
|
// Adds a string to the string table. If HashIt is true we hash and check for
|
|
// duplicates. It is optional because the name of global symbols are already
|
|
// uniqued and hashing them again has a big cost for a small value: uniquing
|
|
// them with some other string that happens to be the same.
|
|
template <class ELFT>
|
|
unsigned StringTableSection<ELFT>::addString(StringRef S, bool HashIt) {
|
|
if (HashIt) {
|
|
auto R = StringMap.insert(std::make_pair(S, Size));
|
|
if (!R.second)
|
|
return R.first->second;
|
|
}
|
|
unsigned Ret = Size;
|
|
Size += S.size() + 1;
|
|
Strings.push_back(S);
|
|
return Ret;
|
|
}
|
|
|
|
template <class ELFT> void StringTableSection<ELFT>::writeTo(uint8_t *Buf) {
|
|
// ELF string tables start with NUL byte, so advance the pointer by one.
|
|
++Buf;
|
|
for (StringRef S : Strings) {
|
|
memcpy(Buf, S.data(), S.size());
|
|
Buf += S.size() + 1;
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
SymbolTableSection<ELFT>::SymbolTableSection(
|
|
SymbolTable<ELFT> &Table, StringTableSection<ELFT> &StrTabSec)
|
|
: OutputSectionBase<ELFT>(StrTabSec.isDynamic() ? ".dynsym" : ".symtab",
|
|
StrTabSec.isDynamic() ? SHT_DYNSYM : SHT_SYMTAB,
|
|
StrTabSec.isDynamic() ? (uintX_t)SHF_ALLOC : 0),
|
|
StrTabSec(StrTabSec), Table(Table) {
|
|
this->Header.sh_entsize = sizeof(Elf_Sym);
|
|
this->Header.sh_addralign = sizeof(uintX_t);
|
|
}
|
|
|
|
// Orders symbols according to their positions in the GOT,
|
|
// in compliance with MIPS ABI rules.
|
|
// See "Global Offset Table" in Chapter 5 in the following document
|
|
// for detailed description:
|
|
// ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf
|
|
static bool sortMipsSymbols(const std::pair<SymbolBody *, unsigned> &L,
|
|
const std::pair<SymbolBody *, unsigned> &R) {
|
|
if (!L.first->isInGot() || !R.first->isInGot())
|
|
return R.first->isInGot();
|
|
return L.first->GotIndex < R.first->GotIndex;
|
|
}
|
|
|
|
template <class ELFT> void SymbolTableSection<ELFT>::finalize() {
|
|
if (this->Header.sh_size)
|
|
return; // Already finalized.
|
|
|
|
this->Header.sh_size = getNumSymbols() * sizeof(Elf_Sym);
|
|
this->Header.sh_link = StrTabSec.SectionIndex;
|
|
this->Header.sh_info = NumLocals + 1;
|
|
|
|
if (!StrTabSec.isDynamic()) {
|
|
std::stable_sort(Symbols.begin(), Symbols.end(),
|
|
[](const std::pair<SymbolBody *, unsigned> &L,
|
|
const std::pair<SymbolBody *, unsigned> &R) {
|
|
return getSymbolBinding(L.first) == STB_LOCAL &&
|
|
getSymbolBinding(R.first) != STB_LOCAL;
|
|
});
|
|
return;
|
|
}
|
|
if (Out<ELFT>::GnuHashTab)
|
|
// NB: It also sorts Symbols to meet the GNU hash table requirements.
|
|
Out<ELFT>::GnuHashTab->addSymbols(Symbols);
|
|
else if (Config->EMachine == EM_MIPS)
|
|
std::stable_sort(Symbols.begin(), Symbols.end(), sortMipsSymbols);
|
|
size_t I = 0;
|
|
for (const std::pair<SymbolBody *, unsigned> &P : Symbols)
|
|
P.first->DynsymIndex = ++I;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void SymbolTableSection<ELFT>::addSymbol(SymbolBody *Body) {
|
|
Symbols.push_back(
|
|
std::make_pair(Body, StrTabSec.addString(Body->getName(), false)));
|
|
}
|
|
|
|
template <class ELFT> void SymbolTableSection<ELFT>::writeTo(uint8_t *Buf) {
|
|
Buf += sizeof(Elf_Sym);
|
|
|
|
// All symbols with STB_LOCAL binding precede the weak and global symbols.
|
|
// .dynsym only contains global symbols.
|
|
if (!Config->DiscardAll && !StrTabSec.isDynamic())
|
|
writeLocalSymbols(Buf);
|
|
|
|
writeGlobalSymbols(Buf);
|
|
}
|
|
|
|
template <class ELFT>
|
|
void SymbolTableSection<ELFT>::writeLocalSymbols(uint8_t *&Buf) {
|
|
// Iterate over all input object files to copy their local symbols
|
|
// to the output symbol table pointed by Buf.
|
|
for (const std::unique_ptr<ObjectFile<ELFT>> &File : Table.getObjectFiles()) {
|
|
for (const std::pair<const Elf_Sym *, unsigned> &P : File->KeptLocalSyms) {
|
|
const Elf_Sym *Sym = P.first;
|
|
|
|
auto *ESym = reinterpret_cast<Elf_Sym *>(Buf);
|
|
uintX_t VA = 0;
|
|
if (Sym->st_shndx == SHN_ABS) {
|
|
ESym->st_shndx = SHN_ABS;
|
|
VA = Sym->st_value;
|
|
} else {
|
|
InputSectionBase<ELFT> *Section = File->getSection(*Sym);
|
|
const OutputSectionBase<ELFT> *OutSec = Section->OutSec;
|
|
ESym->st_shndx = OutSec->SectionIndex;
|
|
VA = Section->getOffset(*Sym);
|
|
// Symbol offsets for AMDGPU need to be the offset in bytes of the
|
|
// symbol from the beginning of the section.
|
|
if (Config->EMachine != EM_AMDGPU)
|
|
VA += OutSec->getVA();
|
|
}
|
|
ESym->st_name = P.second;
|
|
ESym->st_size = Sym->st_size;
|
|
ESym->setBindingAndType(Sym->getBinding(), Sym->getType());
|
|
ESym->st_value = VA;
|
|
Buf += sizeof(*ESym);
|
|
}
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
static const typename llvm::object::ELFFile<ELFT>::Elf_Sym *
|
|
getElfSym(SymbolBody &Body) {
|
|
if (auto *EBody = dyn_cast<DefinedElf<ELFT>>(&Body))
|
|
return &EBody->Sym;
|
|
if (auto *EBody = dyn_cast<UndefinedElf<ELFT>>(&Body))
|
|
return &EBody->Sym;
|
|
return nullptr;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void SymbolTableSection<ELFT>::writeGlobalSymbols(uint8_t *Buf) {
|
|
// Write the internal symbol table contents to the output symbol table
|
|
// pointed by Buf.
|
|
auto *ESym = reinterpret_cast<Elf_Sym *>(Buf);
|
|
for (const std::pair<SymbolBody *, unsigned> &P : Symbols) {
|
|
SymbolBody *Body = P.first;
|
|
const OutputSectionBase<ELFT> *OutSec = nullptr;
|
|
|
|
switch (Body->kind()) {
|
|
case SymbolBody::DefinedSyntheticKind:
|
|
OutSec = &cast<DefinedSynthetic<ELFT>>(Body)->Section;
|
|
break;
|
|
case SymbolBody::DefinedRegularKind: {
|
|
auto *Sym = cast<DefinedRegular<ELFT>>(Body->repl());
|
|
if (InputSectionBase<ELFT> *Sec = Sym->Section) {
|
|
if (!Sec->isLive())
|
|
continue;
|
|
OutSec = Sec->OutSec;
|
|
}
|
|
break;
|
|
}
|
|
case SymbolBody::DefinedCommonKind:
|
|
OutSec = Out<ELFT>::Bss;
|
|
break;
|
|
case SymbolBody::SharedKind: {
|
|
if (cast<SharedSymbol<ELFT>>(Body)->NeedsCopy)
|
|
OutSec = Out<ELFT>::Bss;
|
|
break;
|
|
}
|
|
case SymbolBody::UndefinedElfKind:
|
|
case SymbolBody::UndefinedKind:
|
|
case SymbolBody::LazyKind:
|
|
break;
|
|
}
|
|
|
|
ESym->st_name = P.second;
|
|
|
|
unsigned char Type = STT_NOTYPE;
|
|
uintX_t Size = 0;
|
|
if (const Elf_Sym *InputSym = getElfSym<ELFT>(*Body)) {
|
|
Type = InputSym->getType();
|
|
Size = InputSym->st_size;
|
|
} else if (auto *C = dyn_cast<DefinedCommon>(Body)) {
|
|
Type = STT_OBJECT;
|
|
Size = C->Size;
|
|
}
|
|
|
|
ESym->setBindingAndType(getSymbolBinding(Body), Type);
|
|
ESym->st_size = Size;
|
|
ESym->setVisibility(Body->getVisibility());
|
|
ESym->st_value = Body->getVA<ELFT>();
|
|
|
|
if (OutSec)
|
|
ESym->st_shndx = OutSec->SectionIndex;
|
|
else if (isa<DefinedRegular<ELFT>>(Body))
|
|
ESym->st_shndx = SHN_ABS;
|
|
|
|
++ESym;
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
uint8_t SymbolTableSection<ELFT>::getSymbolBinding(SymbolBody *Body) {
|
|
uint8_t Visibility = Body->getVisibility();
|
|
if (Visibility != STV_DEFAULT && Visibility != STV_PROTECTED)
|
|
return STB_LOCAL;
|
|
if (const Elf_Sym *ESym = getElfSym<ELFT>(*Body))
|
|
return ESym->getBinding();
|
|
if (isa<DefinedSynthetic<ELFT>>(Body))
|
|
return STB_LOCAL;
|
|
return Body->isWeak() ? STB_WEAK : STB_GLOBAL;
|
|
}
|
|
|
|
template <class ELFT>
|
|
MipsReginfoOutputSection<ELFT>::MipsReginfoOutputSection()
|
|
: OutputSectionBase<ELFT>(".reginfo", SHT_MIPS_REGINFO, SHF_ALLOC) {
|
|
this->Header.sh_addralign = 4;
|
|
this->Header.sh_entsize = sizeof(Elf_Mips_RegInfo);
|
|
this->Header.sh_size = sizeof(Elf_Mips_RegInfo);
|
|
}
|
|
|
|
template <class ELFT>
|
|
void MipsReginfoOutputSection<ELFT>::writeTo(uint8_t *Buf) {
|
|
auto *R = reinterpret_cast<Elf_Mips_RegInfo *>(Buf);
|
|
R->ri_gp_value = getMipsGpAddr<ELFT>();
|
|
R->ri_gprmask = GprMask;
|
|
}
|
|
|
|
template <class ELFT>
|
|
void MipsReginfoOutputSection<ELFT>::addSection(InputSectionBase<ELFT> *C) {
|
|
// Copy input object file's .reginfo gprmask to output.
|
|
auto *S = cast<MipsReginfoInputSection<ELFT>>(C);
|
|
GprMask |= S->Reginfo->ri_gprmask;
|
|
}
|
|
|
|
namespace lld {
|
|
namespace elf2 {
|
|
template class OutputSectionBase<ELF32LE>;
|
|
template class OutputSectionBase<ELF32BE>;
|
|
template class OutputSectionBase<ELF64LE>;
|
|
template class OutputSectionBase<ELF64BE>;
|
|
|
|
template class EhFrameHeader<ELF32LE>;
|
|
template class EhFrameHeader<ELF32BE>;
|
|
template class EhFrameHeader<ELF64LE>;
|
|
template class EhFrameHeader<ELF64BE>;
|
|
|
|
template class GotPltSection<ELF32LE>;
|
|
template class GotPltSection<ELF32BE>;
|
|
template class GotPltSection<ELF64LE>;
|
|
template class GotPltSection<ELF64BE>;
|
|
|
|
template class GotSection<ELF32LE>;
|
|
template class GotSection<ELF32BE>;
|
|
template class GotSection<ELF64LE>;
|
|
template class GotSection<ELF64BE>;
|
|
|
|
template class PltSection<ELF32LE>;
|
|
template class PltSection<ELF32BE>;
|
|
template class PltSection<ELF64LE>;
|
|
template class PltSection<ELF64BE>;
|
|
|
|
template class RelocationSection<ELF32LE>;
|
|
template class RelocationSection<ELF32BE>;
|
|
template class RelocationSection<ELF64LE>;
|
|
template class RelocationSection<ELF64BE>;
|
|
|
|
template class InterpSection<ELF32LE>;
|
|
template class InterpSection<ELF32BE>;
|
|
template class InterpSection<ELF64LE>;
|
|
template class InterpSection<ELF64BE>;
|
|
|
|
template class GnuHashTableSection<ELF32LE>;
|
|
template class GnuHashTableSection<ELF32BE>;
|
|
template class GnuHashTableSection<ELF64LE>;
|
|
template class GnuHashTableSection<ELF64BE>;
|
|
|
|
template class HashTableSection<ELF32LE>;
|
|
template class HashTableSection<ELF32BE>;
|
|
template class HashTableSection<ELF64LE>;
|
|
template class HashTableSection<ELF64BE>;
|
|
|
|
template class DynamicSection<ELF32LE>;
|
|
template class DynamicSection<ELF32BE>;
|
|
template class DynamicSection<ELF64LE>;
|
|
template class DynamicSection<ELF64BE>;
|
|
|
|
template class OutputSection<ELF32LE>;
|
|
template class OutputSection<ELF32BE>;
|
|
template class OutputSection<ELF64LE>;
|
|
template class OutputSection<ELF64BE>;
|
|
|
|
template class EHOutputSection<ELF32LE>;
|
|
template class EHOutputSection<ELF32BE>;
|
|
template class EHOutputSection<ELF64LE>;
|
|
template class EHOutputSection<ELF64BE>;
|
|
|
|
template class MipsReginfoOutputSection<ELF32LE>;
|
|
template class MipsReginfoOutputSection<ELF32BE>;
|
|
template class MipsReginfoOutputSection<ELF64LE>;
|
|
template class MipsReginfoOutputSection<ELF64BE>;
|
|
|
|
template class MergeOutputSection<ELF32LE>;
|
|
template class MergeOutputSection<ELF32BE>;
|
|
template class MergeOutputSection<ELF64LE>;
|
|
template class MergeOutputSection<ELF64BE>;
|
|
|
|
template class StringTableSection<ELF32LE>;
|
|
template class StringTableSection<ELF32BE>;
|
|
template class StringTableSection<ELF64LE>;
|
|
template class StringTableSection<ELF64BE>;
|
|
|
|
template class SymbolTableSection<ELF32LE>;
|
|
template class SymbolTableSection<ELF32BE>;
|
|
template class SymbolTableSection<ELF64LE>;
|
|
template class SymbolTableSection<ELF64BE>;
|
|
|
|
template uint32_t getLocalRelTarget(const ObjectFile<ELF32LE> &,
|
|
const ELFFile<ELF32LE>::Elf_Rel &,
|
|
uint32_t);
|
|
template uint32_t getLocalRelTarget(const ObjectFile<ELF32BE> &,
|
|
const ELFFile<ELF32BE>::Elf_Rel &,
|
|
uint32_t);
|
|
template uint64_t getLocalRelTarget(const ObjectFile<ELF64LE> &,
|
|
const ELFFile<ELF64LE>::Elf_Rel &,
|
|
uint64_t);
|
|
template uint64_t getLocalRelTarget(const ObjectFile<ELF64BE> &,
|
|
const ELFFile<ELF64BE>::Elf_Rel &,
|
|
uint64_t);
|
|
template uint32_t getLocalRelTarget(const ObjectFile<ELF32LE> &,
|
|
const ELFFile<ELF32LE>::Elf_Rela &,
|
|
uint32_t);
|
|
template uint32_t getLocalRelTarget(const ObjectFile<ELF32BE> &,
|
|
const ELFFile<ELF32BE>::Elf_Rela &,
|
|
uint32_t);
|
|
template uint64_t getLocalRelTarget(const ObjectFile<ELF64LE> &,
|
|
const ELFFile<ELF64LE>::Elf_Rela &,
|
|
uint64_t);
|
|
template uint64_t getLocalRelTarget(const ObjectFile<ELF64BE> &,
|
|
const ELFFile<ELF64BE>::Elf_Rela &,
|
|
uint64_t);
|
|
}
|
|
}
|