cfeb2512fd
We don't need to repeat the template argument. They are not ambiguous. MIPS is parameterized for ELFT, so we can't do this for MIPS, though. llvm-svn: 234913
123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
//===--------- lib/ReaderWriter/ELF/ARM/ARMExecutableWriter.h -------------===//
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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_READER_WRITER_ELF_ARM_ARM_EXECUTABLE_WRITER_H
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#define LLD_READER_WRITER_ELF_ARM_ARM_EXECUTABLE_WRITER_H
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#include "ExecutableWriter.h"
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#include "ARMLinkingContext.h"
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#include "ARMTargetHandler.h"
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#include "ARMSymbolTable.h"
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#include "llvm/Support/ELF.h"
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namespace {
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const char *gotSymbol = "_GLOBAL_OFFSET_TABLE_";
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}
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namespace lld {
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namespace elf {
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class ARMExecutableWriter : public ExecutableWriter<ELF32LE> {
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public:
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ARMExecutableWriter(ARMLinkingContext &ctx, ARMTargetLayout &layout);
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protected:
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// Add any runtime files and their atoms to the output
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void createImplicitFiles(std::vector<std::unique_ptr<File>> &) override;
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void finalizeDefaultAtomValues() override;
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/// \brief Create symbol table.
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unique_bump_ptr<SymbolTable<ELF32LE>> createSymbolTable() override;
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void processUndefinedSymbol(StringRef symName,
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RuntimeFile<ELF32LE> &file) const override;
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// Setup the ELF header.
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std::error_code setELFHeader() override;
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private:
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ARMLinkingContext &_ctx;
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ARMTargetLayout &_armLayout;
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};
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ARMExecutableWriter::ARMExecutableWriter(ARMLinkingContext &ctx,
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ARMTargetLayout &layout)
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: ExecutableWriter(ctx, layout), _ctx(ctx), _armLayout(layout) {}
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void ARMExecutableWriter::createImplicitFiles(
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std::vector<std::unique_ptr<File>> &result) {
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ExecutableWriter::createImplicitFiles(result);
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}
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void ARMExecutableWriter::finalizeDefaultAtomValues() {
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// Finalize the atom values that are part of the parent.
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ExecutableWriter::finalizeDefaultAtomValues();
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AtomLayout *gotAtom = _armLayout.findAbsoluteAtom(gotSymbol);
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if (gotAtom) {
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if (auto gotpltSection = _armLayout.findOutputSection(".got.plt"))
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gotAtom->_virtualAddr = gotpltSection->virtualAddr();
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else if (auto gotSection = _armLayout.findOutputSection(".got"))
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gotAtom->_virtualAddr = gotSection->virtualAddr();
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else
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gotAtom->_virtualAddr = 0;
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}
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// TODO: resolve addresses of __exidx_start/_end atoms
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}
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unique_bump_ptr<SymbolTable<ELF32LE>> ARMExecutableWriter::createSymbolTable() {
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return unique_bump_ptr<SymbolTable<ELF32LE>>(new (_alloc)
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ARMSymbolTable(_ctx));
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}
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void ARMExecutableWriter::processUndefinedSymbol(
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StringRef symName, RuntimeFile<ELF32LE> &file) const {
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if (symName == gotSymbol) {
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file.addAbsoluteAtom(gotSymbol);
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} else if (symName.startswith("__exidx")) {
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file.addAbsoluteAtom("__exidx_start");
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file.addAbsoluteAtom("__exidx_end");
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}
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}
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std::error_code ARMExecutableWriter::setELFHeader() {
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if (std::error_code ec = ExecutableWriter::setELFHeader())
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return ec;
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// Set ARM-specific flags.
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_elfHeader->e_flags(llvm::ELF::EF_ARM_EABI_VER5 |
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llvm::ELF::EF_ARM_VFP_FLOAT);
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StringRef entryName = _ctx.entrySymbolName();
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if (const AtomLayout *al = _armLayout.findAtomLayoutByName(entryName)) {
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if (const auto *ea = dyn_cast<DefinedAtom>(al->_atom)) {
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switch (ea->codeModel()) {
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case DefinedAtom::codeNA:
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if (al->_virtualAddr & 0x3) {
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llvm::report_fatal_error(
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"Two least bits must be zero for ARM entry point");
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}
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break;
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case DefinedAtom::codeARMThumb:
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// Fixup entry point for Thumb code.
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_elfHeader->e_entry(al->_virtualAddr | 0x1);
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break;
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default:
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llvm_unreachable("Wrong code model of entry point atom");
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}
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}
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}
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return std::error_code();
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}
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} // namespace elf
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} // namespace lld
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#endif // LLD_READER_WRITER_ELF_ARM_ARM_EXECUTABLE_WRITER_H
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