forked from OSchip/llvm-project
103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
//===- InputSection.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 "InputSection.h"
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#include "Config.h"
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#include "Error.h"
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#include "InputFiles.h"
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#include "OutputSections.h"
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#include "Target.h"
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using namespace llvm;
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using namespace llvm::ELF;
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using namespace llvm::object;
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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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InputSection<ELFT>::InputSection(ObjectFile<ELFT> *F, const Elf_Shdr *Header)
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: File(F), Header(Header) {}
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template <class ELFT>
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template <bool isRela>
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void InputSection<ELFT>::relocate(
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uint8_t *Buf, uint8_t *BufEnd,
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iterator_range<const Elf_Rel_Impl<ELFT, isRela> *> Rels,
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const ObjectFile<ELFT> &File, uintX_t BaseAddr) {
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typedef Elf_Rel_Impl<ELFT, isRela> RelType;
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bool IsMips64EL = File.getObj().isMips64EL();
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for (const RelType &RI : Rels) {
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uint32_t SymIndex = RI.getSymbol(IsMips64EL);
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uint32_t Type = RI.getType(IsMips64EL);
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// Handle relocations for local symbols -- they never get
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// resolved so we don't allocate a SymbolBody.
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const Elf_Shdr *SymTab = File.getSymbolTable();
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if (SymIndex < SymTab->sh_info) {
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uintX_t SymVA = getLocalRelTarget(File, RI);
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Target->relocateOne(Buf, BufEnd, reinterpret_cast<const void *>(&RI),
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Type, BaseAddr, SymVA);
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continue;
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}
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SymbolBody &Body = *File.getSymbolBody(SymIndex)->repl();
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uintX_t SymVA = getSymVA<ELFT>(Body);
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if (Target->relocNeedsPlt(Type, Body)) {
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SymVA = Out<ELFT>::Plt->getEntryAddr(Body);
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Type = Target->getPLTRefReloc(Type);
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} else if (Target->relocNeedsGot(Type, Body)) {
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SymVA = Out<ELFT>::Got->getEntryAddr(Body);
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Type = Target->getGotRefReloc();
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} else if (Target->relocPointsToGot(Type)) {
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SymVA = Out<ELFT>::Got->getVA();
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Type = Target->getPCRelReloc();
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} else if (isa<SharedSymbol<ELFT>>(Body)) {
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continue;
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}
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Target->relocateOne(Buf, BufEnd, reinterpret_cast<const void *>(&RI), Type,
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BaseAddr, SymVA);
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}
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}
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template <class ELFT> void InputSection<ELFT>::writeTo(uint8_t *Buf) {
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if (Header->sh_type == SHT_NOBITS)
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return;
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// Copy section contents from source object file to output file.
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ArrayRef<uint8_t> Data = *File->getObj().getSectionContents(Header);
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memcpy(Buf + OutputSectionOff, Data.data(), Data.size());
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ObjectFile<ELFT> *File = getFile();
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ELFFile<ELFT> &EObj = File->getObj();
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uint8_t *Base = Buf + OutputSectionOff;
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uintX_t BaseAddr = OutputSection->getVA() + OutputSectionOff;
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// Iterate over all relocation sections that apply to this section.
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for (const Elf_Shdr *RelSec : RelocSections) {
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if (RelSec->sh_type == SHT_RELA)
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relocate(Base, Base + Data.size(), EObj.relas(RelSec), *File, BaseAddr);
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else
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relocate(Base, Base + Data.size(), EObj.rels(RelSec), *File, BaseAddr);
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}
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}
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template <class ELFT> StringRef InputSection<ELFT>::getSectionName() const {
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ErrorOr<StringRef> Name = File->getObj().getSectionName(Header);
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error(Name);
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return *Name;
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}
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namespace lld {
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namespace elf2 {
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template class InputSection<object::ELF32LE>;
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template class InputSection<object::ELF32BE>;
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template class InputSection<object::ELF64LE>;
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template class InputSection<object::ELF64BE>;
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}
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}
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