forked from OSchip/llvm-project
598 lines
19 KiB
C++
598 lines
19 KiB
C++
//===- OutputSections.h -----------------------------------------*- C++ -*-===//
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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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#ifndef LLD_ELF_OUTPUT_SECTIONS_H
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#define LLD_ELF_OUTPUT_SECTIONS_H
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#include "Config.h"
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#include "lld/Core/LLVM.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/MC/StringTableBuilder.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Support/MD5.h"
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#include "llvm/Support/SHA1.h"
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namespace lld {
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namespace elf {
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class SymbolBody;
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template <class ELFT> class SymbolTable;
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template <class ELFT> class SymbolTableSection;
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template <class ELFT> class StringTableSection;
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template <class ELFT> class EHInputSection;
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template <class ELFT> class InputSection;
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template <class ELFT> class InputSectionBase;
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template <class ELFT> class MergeInputSection;
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template <class ELFT> class MipsReginfoInputSection;
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template <class ELFT> class OutputSection;
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template <class ELFT> class ObjectFile;
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template <class ELFT> class DefinedRegular;
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template <class ELFT>
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static inline typename ELFT::uint getAddend(const typename ELFT::Rel &Rel) {
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return 0;
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}
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template <class ELFT>
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static inline typename ELFT::uint getAddend(const typename ELFT::Rela &Rel) {
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return Rel.r_addend;
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}
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bool isValidCIdentifier(StringRef S);
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// This represents a section in an output file.
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// Different sub classes represent different types of sections. Some contain
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// input sections, others are created by the linker.
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// The writer creates multiple OutputSections and assign them unique,
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// non-overlapping file offsets and VAs.
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template <class ELFT> class OutputSectionBase {
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public:
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typedef typename ELFT::uint uintX_t;
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typedef typename ELFT::Shdr Elf_Shdr;
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OutputSectionBase(StringRef Name, uint32_t Type, uintX_t Flags);
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void setVA(uintX_t VA) { Header.sh_addr = VA; }
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uintX_t getVA() const { return Header.sh_addr; }
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void setFileOffset(uintX_t Off) { Header.sh_offset = Off; }
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void setSHName(unsigned Val) { Header.sh_name = Val; }
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void writeHeaderTo(Elf_Shdr *SHdr);
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StringRef getName() { return Name; }
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virtual void addSection(InputSectionBase<ELFT> *C) {}
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unsigned SectionIndex;
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// Returns the size of the section in the output file.
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uintX_t getSize() const { return Header.sh_size; }
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void setSize(uintX_t Val) { Header.sh_size = Val; }
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uintX_t getFlags() const { return Header.sh_flags; }
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uintX_t getFileOff() const { return Header.sh_offset; }
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uintX_t getAlign() const {
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// The ELF spec states that a value of 0 means the section has no alignment
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// constraits.
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return std::max<uintX_t>(Header.sh_addralign, 1);
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}
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uint32_t getType() const { return Header.sh_type; }
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void updateAlign(uintX_t Align) {
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if (Align > Header.sh_addralign)
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Header.sh_addralign = Align;
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}
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// If true, this section will be page aligned on disk.
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// Typically the first section of each PT_LOAD segment has this flag.
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bool PageAlign = false;
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virtual void finalize() {}
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virtual void
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forEachInputSection(std::function<void(InputSectionBase<ELFT> *)> F) {}
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virtual void writeTo(uint8_t *Buf) {}
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virtual ~OutputSectionBase() = default;
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protected:
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StringRef Name;
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Elf_Shdr Header;
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};
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template <class ELFT> class GotSection final : public OutputSectionBase<ELFT> {
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typedef OutputSectionBase<ELFT> Base;
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typedef typename ELFT::uint uintX_t;
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public:
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GotSection();
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void finalize() override;
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void writeTo(uint8_t *Buf) override;
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void addEntry(SymbolBody &Sym);
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bool addDynTlsEntry(SymbolBody &Sym);
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bool addTlsIndex();
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bool empty() const { return MipsLocalEntries == 0 && Entries.empty(); }
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uintX_t getMipsLocalEntryOffset(uintX_t EntryValue);
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uintX_t getMipsLocalPageOffset(uintX_t Addr);
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uintX_t getGlobalDynAddr(const SymbolBody &B) const;
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uintX_t getGlobalDynOffset(const SymbolBody &B) const;
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uintX_t getNumEntries() const { return Entries.size(); }
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// Returns the symbol which corresponds to the first entry of the global part
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// of GOT on MIPS platform. It is required to fill up MIPS-specific dynamic
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// table properties.
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// Returns nullptr if the global part is empty.
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const SymbolBody *getMipsFirstGlobalEntry() const;
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// Returns the number of entries in the local part of GOT including
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// the number of reserved entries. This method is MIPS-specific.
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unsigned getMipsLocalEntriesNum() const;
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uintX_t getTlsIndexVA() { return Base::getVA() + TlsIndexOff; }
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uint32_t getTlsIndexOff() { return TlsIndexOff; }
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private:
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std::vector<const SymbolBody *> Entries;
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uint32_t TlsIndexOff = -1;
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uint32_t MipsLocalEntries = 0;
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// Output sections referenced by MIPS GOT relocations.
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llvm::SmallPtrSet<const OutputSectionBase<ELFT> *, 10> MipsOutSections;
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llvm::DenseMap<uintX_t, size_t> MipsLocalGotPos;
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};
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template <class ELFT>
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class GotPltSection final : public OutputSectionBase<ELFT> {
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typedef typename ELFT::uint uintX_t;
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public:
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GotPltSection();
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void finalize() override;
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void writeTo(uint8_t *Buf) override;
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void addEntry(SymbolBody &Sym);
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bool empty() const;
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private:
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std::vector<const SymbolBody *> Entries;
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};
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template <class ELFT> class PltSection final : public OutputSectionBase<ELFT> {
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typedef OutputSectionBase<ELFT> Base;
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typedef typename ELFT::uint uintX_t;
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public:
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PltSection();
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void finalize() override;
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void writeTo(uint8_t *Buf) override;
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void addEntry(SymbolBody &Sym);
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bool empty() const { return Entries.empty(); }
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private:
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std::vector<std::pair<const SymbolBody *, unsigned>> Entries;
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};
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template <class ELFT> struct DynamicReloc {
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typedef typename ELFT::uint uintX_t;
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uint32_t Type;
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SymbolBody *Sym;
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const OutputSectionBase<ELFT> *OffsetSec;
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uintX_t OffsetInSec;
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bool UseSymVA;
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uintX_t Addend;
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DynamicReloc(uint32_t Type, const OutputSectionBase<ELFT> *OffsetSec,
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uintX_t OffsetInSec, bool UseSymVA, SymbolBody *Sym,
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uintX_t Addend)
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: Type(Type), Sym(Sym), OffsetSec(OffsetSec), OffsetInSec(OffsetInSec),
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UseSymVA(UseSymVA), Addend(Addend) {}
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};
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template <class ELFT>
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class SymbolTableSection final : public OutputSectionBase<ELFT> {
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public:
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typedef typename ELFT::Shdr Elf_Shdr;
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typedef typename ELFT::Sym Elf_Sym;
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typedef typename ELFT::SymRange Elf_Sym_Range;
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typedef typename ELFT::uint uintX_t;
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SymbolTableSection(SymbolTable<ELFT> &Table,
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StringTableSection<ELFT> &StrTabSec);
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void finalize() override;
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void writeTo(uint8_t *Buf) override;
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void addSymbol(SymbolBody *Body);
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StringTableSection<ELFT> &getStrTabSec() const { return StrTabSec; }
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unsigned getNumSymbols() const { return NumLocals + Symbols.size() + 1; }
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ArrayRef<std::pair<SymbolBody *, size_t>> getSymbols() const {
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return Symbols;
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}
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unsigned NumLocals = 0;
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StringTableSection<ELFT> &StrTabSec;
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private:
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void writeLocalSymbols(uint8_t *&Buf);
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void writeGlobalSymbols(uint8_t *Buf);
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const OutputSectionBase<ELFT> *getOutputSection(SymbolBody *Sym);
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SymbolTable<ELFT> &Table;
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// A vector of symbols and their string table offsets.
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std::vector<std::pair<SymbolBody *, size_t>> Symbols;
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};
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template <class ELFT>
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class RelocationSection final : public OutputSectionBase<ELFT> {
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typedef typename ELFT::Rel Elf_Rel;
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typedef typename ELFT::Rela Elf_Rela;
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typedef typename ELFT::uint uintX_t;
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public:
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RelocationSection(StringRef Name);
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void addReloc(const DynamicReloc<ELFT> &Reloc);
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unsigned getRelocOffset();
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void finalize() override;
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void writeTo(uint8_t *Buf) override;
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bool hasRelocs() const { return !Relocs.empty(); }
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bool Static = false;
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private:
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std::vector<DynamicReloc<ELFT>> Relocs;
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};
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template <class ELFT>
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class OutputSection final : public OutputSectionBase<ELFT> {
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public:
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typedef typename ELFT::Shdr Elf_Shdr;
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typedef typename ELFT::Sym Elf_Sym;
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typedef typename ELFT::Rel Elf_Rel;
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typedef typename ELFT::Rela Elf_Rela;
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typedef typename ELFT::uint uintX_t;
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OutputSection(StringRef Name, uint32_t Type, uintX_t Flags);
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void addSection(InputSectionBase<ELFT> *C) override;
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void sortInitFini();
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void sortCtorsDtors();
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void writeTo(uint8_t *Buf) override;
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void finalize() override;
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void
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forEachInputSection(std::function<void(InputSectionBase<ELFT> *)> F) override;
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std::vector<InputSection<ELFT> *> Sections;
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};
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template <class ELFT>
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class MergeOutputSection final : public OutputSectionBase<ELFT> {
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typedef typename ELFT::uint uintX_t;
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bool shouldTailMerge() const;
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public:
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MergeOutputSection(StringRef Name, uint32_t Type, uintX_t Flags,
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uintX_t Alignment);
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void addSection(InputSectionBase<ELFT> *S) override;
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void writeTo(uint8_t *Buf) override;
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unsigned getOffset(StringRef Val);
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void finalize() override;
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private:
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llvm::StringTableBuilder Builder;
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};
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// FDE or CIE
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template <class ELFT> struct EHRegion {
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typedef typename ELFT::uint uintX_t;
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EHRegion(EHInputSection<ELFT> *S, unsigned Index);
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StringRef data() const;
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EHInputSection<ELFT> *S;
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unsigned Index;
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};
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template <class ELFT> struct Cie : public EHRegion<ELFT> {
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Cie(EHInputSection<ELFT> *S, unsigned Index);
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std::vector<EHRegion<ELFT>> Fdes;
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uint8_t FdeEncoding;
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};
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template <class ELFT>
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class EHOutputSection final : public OutputSectionBase<ELFT> {
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public:
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typedef typename ELFT::uint uintX_t;
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typedef typename ELFT::Shdr Elf_Shdr;
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typedef typename ELFT::Rel Elf_Rel;
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typedef typename ELFT::Rela Elf_Rela;
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EHOutputSection(StringRef Name, uint32_t Type, uintX_t Flags);
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void writeTo(uint8_t *Buf) override;
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void finalize() override;
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void
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forEachInputSection(std::function<void(InputSectionBase<ELFT> *)> F) override;
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template <class RelTy>
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void addSectionAux(EHInputSection<ELFT> *S, llvm::ArrayRef<RelTy> Rels);
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void addSection(InputSectionBase<ELFT> *S) override;
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private:
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uint8_t getFdeEncoding(ArrayRef<uint8_t> D);
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std::vector<EHInputSection<ELFT> *> Sections;
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std::vector<Cie<ELFT>> Cies;
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// Maps CIE content + personality to a index in Cies.
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llvm::DenseMap<std::pair<StringRef, SymbolBody *>, unsigned> CieMap;
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bool Finalized = false;
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};
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template <class ELFT>
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class InterpSection final : public OutputSectionBase<ELFT> {
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public:
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InterpSection();
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void writeTo(uint8_t *Buf) override;
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};
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template <class ELFT>
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class StringTableSection final : public OutputSectionBase<ELFT> {
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public:
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typedef typename ELFT::uint uintX_t;
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StringTableSection(StringRef Name, bool Dynamic);
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unsigned addString(StringRef S, bool HashIt = true);
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void writeTo(uint8_t *Buf) override;
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unsigned getSize() const { return Size; }
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void finalize() override { this->Header.sh_size = getSize(); }
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bool isDynamic() const { return Dynamic; }
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private:
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const bool Dynamic;
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llvm::DenseMap<StringRef, unsigned> StringMap;
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std::vector<StringRef> Strings;
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unsigned Size = 1; // ELF string tables start with a NUL byte, so 1.
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};
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template <class ELFT>
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class HashTableSection final : public OutputSectionBase<ELFT> {
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typedef typename ELFT::Word Elf_Word;
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public:
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HashTableSection();
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void finalize() override;
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void writeTo(uint8_t *Buf) override;
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};
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// Outputs GNU Hash section. For detailed explanation see:
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// https://blogs.oracle.com/ali/entry/gnu_hash_elf_sections
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template <class ELFT>
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class GnuHashTableSection final : public OutputSectionBase<ELFT> {
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typedef typename ELFT::Off Elf_Off;
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typedef typename ELFT::Word Elf_Word;
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typedef typename ELFT::uint uintX_t;
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public:
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GnuHashTableSection();
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void finalize() override;
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void writeTo(uint8_t *Buf) override;
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// Adds symbols to the hash table.
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// Sorts the input to satisfy GNU hash section requirements.
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void addSymbols(std::vector<std::pair<SymbolBody *, size_t>> &Symbols);
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private:
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static unsigned calcNBuckets(unsigned NumHashed);
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static unsigned calcMaskWords(unsigned NumHashed);
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void writeHeader(uint8_t *&Buf);
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void writeBloomFilter(uint8_t *&Buf);
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void writeHashTable(uint8_t *Buf);
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struct SymbolData {
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SymbolBody *Body;
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size_t STName;
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uint32_t Hash;
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};
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std::vector<SymbolData> Symbols;
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unsigned MaskWords;
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unsigned NBuckets;
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unsigned Shift2;
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};
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template <class ELFT>
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class DynamicSection final : public OutputSectionBase<ELFT> {
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typedef OutputSectionBase<ELFT> Base;
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typedef typename ELFT::Dyn Elf_Dyn;
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typedef typename ELFT::Rel Elf_Rel;
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typedef typename ELFT::Rela Elf_Rela;
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typedef typename ELFT::Shdr Elf_Shdr;
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typedef typename ELFT::Sym Elf_Sym;
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typedef typename ELFT::uint uintX_t;
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// The .dynamic section contains information for the dynamic linker.
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// The section consists of fixed size entries, which consist of
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// type and value fields. Value are one of plain integers, symbol
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// addresses, or section addresses. This struct represents the entry.
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struct Entry {
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int32_t Tag;
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union {
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OutputSectionBase<ELFT> *OutSec;
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uint64_t Val;
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const SymbolBody *Sym;
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};
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enum KindT { SecAddr, SymAddr, PlainInt } Kind;
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Entry(int32_t Tag, OutputSectionBase<ELFT> *OutSec)
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: Tag(Tag), OutSec(OutSec), Kind(SecAddr) {}
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Entry(int32_t Tag, uint64_t Val) : Tag(Tag), Val(Val), Kind(PlainInt) {}
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Entry(int32_t Tag, const SymbolBody *Sym)
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: Tag(Tag), Sym(Sym), Kind(SymAddr) {}
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};
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// finalize() fills this vector with the section contents. finalize()
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// cannot directly create final section contents because when the
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// function is called, symbol or section addresses are not fixed yet.
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std::vector<Entry> Entries;
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public:
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DynamicSection(SymbolTable<ELFT> &SymTab);
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void finalize() override;
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void writeTo(uint8_t *Buf) override;
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OutputSectionBase<ELFT> *PreInitArraySec = nullptr;
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OutputSectionBase<ELFT> *InitArraySec = nullptr;
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OutputSectionBase<ELFT> *FiniArraySec = nullptr;
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private:
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SymbolTable<ELFT> &SymTab;
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};
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template <class ELFT>
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class MipsReginfoOutputSection final : public OutputSectionBase<ELFT> {
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typedef llvm::object::Elf_Mips_RegInfo<ELFT> Elf_Mips_RegInfo;
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public:
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MipsReginfoOutputSection();
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void writeTo(uint8_t *Buf) override;
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void addSection(InputSectionBase<ELFT> *S) override;
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private:
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uint32_t GprMask = 0;
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};
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// --eh-frame-hdr option tells linker to construct a header for all the
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// .eh_frame sections. This header is placed to a section named .eh_frame_hdr
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// and also to a PT_GNU_EH_FRAME segment.
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// At runtime the unwinder then can find all the PT_GNU_EH_FRAME segments by
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// calling dl_iterate_phdr.
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// This section contains a lookup table for quick binary search of FDEs.
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// Detailed info about internals can be found in Ian Lance Taylor's blog:
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// http://www.airs.com/blog/archives/460 (".eh_frame")
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// http://www.airs.com/blog/archives/462 (".eh_frame_hdr")
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template <class ELFT>
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class EhFrameHeader final : public OutputSectionBase<ELFT> {
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typedef typename ELFT::uint uintX_t;
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public:
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EhFrameHeader();
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void writeTo(uint8_t *Buf) override;
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void addFde(uint8_t Enc, size_t Off, uint8_t *PCRel);
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void assignEhFrame(EHOutputSection<ELFT> *Sec);
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void reserveFde();
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bool Live = false;
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EHOutputSection<ELFT> *Sec = nullptr;
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private:
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struct FdeData {
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uint8_t Enc;
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size_t Off;
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uint8_t *PCRel;
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};
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uintX_t getFdePc(uintX_t EhVA, const FdeData &F);
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std::vector<FdeData> FdeList;
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};
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template <class ELFT> class BuildIdSection : public OutputSectionBase<ELFT> {
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public:
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void writeTo(uint8_t *Buf) override;
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virtual void update(ArrayRef<uint8_t> Buf) = 0;
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virtual void writeBuildId() = 0;
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protected:
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BuildIdSection(size_t HashSize);
|
|
size_t HashSize;
|
|
uint8_t *HashBuf = nullptr;
|
|
};
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|
|
|
template <class ELFT> class BuildIdFnv1 final : public BuildIdSection<ELFT> {
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|
public:
|
|
BuildIdFnv1() : BuildIdSection<ELFT>(8) {}
|
|
void update(ArrayRef<uint8_t> Buf) override;
|
|
void writeBuildId() override;
|
|
|
|
private:
|
|
// 64-bit FNV-1 initial value
|
|
uint64_t Hash = 0xcbf29ce484222325;
|
|
};
|
|
|
|
template <class ELFT> class BuildIdMd5 final : public BuildIdSection<ELFT> {
|
|
public:
|
|
BuildIdMd5() : BuildIdSection<ELFT>(16) {}
|
|
void update(ArrayRef<uint8_t> Buf) override;
|
|
void writeBuildId() override;
|
|
|
|
private:
|
|
llvm::MD5 Hash;
|
|
};
|
|
|
|
template <class ELFT> class BuildIdSha1 final : public BuildIdSection<ELFT> {
|
|
public:
|
|
BuildIdSha1() : BuildIdSection<ELFT>(20) {}
|
|
void update(ArrayRef<uint8_t> Buf) override;
|
|
void writeBuildId() override;
|
|
|
|
private:
|
|
llvm::SHA1 Hash;
|
|
};
|
|
|
|
// All output sections that are hadnled by the linker specially are
|
|
// globally accessible. Writer initializes them, so don't use them
|
|
// until Writer is initialized.
|
|
template <class ELFT> struct Out {
|
|
typedef typename ELFT::uint uintX_t;
|
|
typedef typename ELFT::Phdr Elf_Phdr;
|
|
static BuildIdSection<ELFT> *BuildId;
|
|
static DynamicSection<ELFT> *Dynamic;
|
|
static EhFrameHeader<ELFT> *EhFrameHdr;
|
|
static GnuHashTableSection<ELFT> *GnuHashTab;
|
|
static GotPltSection<ELFT> *GotPlt;
|
|
static GotSection<ELFT> *Got;
|
|
static HashTableSection<ELFT> *HashTab;
|
|
static InterpSection<ELFT> *Interp;
|
|
static OutputSection<ELFT> *Bss;
|
|
static OutputSection<ELFT> *MipsRldMap;
|
|
static OutputSectionBase<ELFT> *Opd;
|
|
static uint8_t *OpdBuf;
|
|
static PltSection<ELFT> *Plt;
|
|
static RelocationSection<ELFT> *RelaDyn;
|
|
static RelocationSection<ELFT> *RelaPlt;
|
|
static StringTableSection<ELFT> *DynStrTab;
|
|
static StringTableSection<ELFT> *ShStrTab;
|
|
static StringTableSection<ELFT> *StrTab;
|
|
static SymbolTableSection<ELFT> *DynSymTab;
|
|
static SymbolTableSection<ELFT> *SymTab;
|
|
static Elf_Phdr *TlsPhdr;
|
|
static OutputSectionBase<ELFT> *ElfHeader;
|
|
static OutputSectionBase<ELFT> *ProgramHeaders;
|
|
};
|
|
|
|
template <class ELFT> BuildIdSection<ELFT> *Out<ELFT>::BuildId;
|
|
template <class ELFT> DynamicSection<ELFT> *Out<ELFT>::Dynamic;
|
|
template <class ELFT> EhFrameHeader<ELFT> *Out<ELFT>::EhFrameHdr;
|
|
template <class ELFT> GnuHashTableSection<ELFT> *Out<ELFT>::GnuHashTab;
|
|
template <class ELFT> GotPltSection<ELFT> *Out<ELFT>::GotPlt;
|
|
template <class ELFT> GotSection<ELFT> *Out<ELFT>::Got;
|
|
template <class ELFT> HashTableSection<ELFT> *Out<ELFT>::HashTab;
|
|
template <class ELFT> InterpSection<ELFT> *Out<ELFT>::Interp;
|
|
template <class ELFT> OutputSection<ELFT> *Out<ELFT>::Bss;
|
|
template <class ELFT> OutputSection<ELFT> *Out<ELFT>::MipsRldMap;
|
|
template <class ELFT> OutputSectionBase<ELFT> *Out<ELFT>::Opd;
|
|
template <class ELFT> uint8_t *Out<ELFT>::OpdBuf;
|
|
template <class ELFT> PltSection<ELFT> *Out<ELFT>::Plt;
|
|
template <class ELFT> RelocationSection<ELFT> *Out<ELFT>::RelaDyn;
|
|
template <class ELFT> RelocationSection<ELFT> *Out<ELFT>::RelaPlt;
|
|
template <class ELFT> StringTableSection<ELFT> *Out<ELFT>::DynStrTab;
|
|
template <class ELFT> StringTableSection<ELFT> *Out<ELFT>::ShStrTab;
|
|
template <class ELFT> StringTableSection<ELFT> *Out<ELFT>::StrTab;
|
|
template <class ELFT> SymbolTableSection<ELFT> *Out<ELFT>::DynSymTab;
|
|
template <class ELFT> SymbolTableSection<ELFT> *Out<ELFT>::SymTab;
|
|
template <class ELFT> typename ELFT::Phdr *Out<ELFT>::TlsPhdr;
|
|
template <class ELFT> OutputSectionBase<ELFT> *Out<ELFT>::ElfHeader;
|
|
template <class ELFT> OutputSectionBase<ELFT> *Out<ELFT>::ProgramHeaders;
|
|
|
|
} // namespace elf
|
|
} // namespace lld
|
|
|
|
#endif // LLD_ELF_OUTPUT_SECTIONS_H
|