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//===--------- lib/ReaderWriter/ELF/ARM/ARMExecutableWriter.h -------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLD_READER_WRITER_ELF_ARM_ARM_EXECUTABLE_WRITER_H
#define LLD_READER_WRITER_ELF_ARM_ARM_EXECUTABLE_WRITER_H
#include "ExecutableWriter.h"
#include "ARMLinkingContext.h"
#include "ARMTargetHandler.h"
#include "ARMSymbolTable.h"
namespace {
const char *gotSymbol = "_GLOBAL_OFFSET_TABLE_";
}
namespace lld {
namespace elf {
template <class ELFT>
class ARMExecutableWriter : public ExecutableWriter<ELFT> {
public:
ARMExecutableWriter(ARMLinkingContext &context,
ARMTargetLayout<ELFT> &layout);
protected:
// Add any runtime files and their atoms to the output
bool createImplicitFiles(std::vector<std::unique_ptr<File>> &) override;
void finalizeDefaultAtomValues() override;
void addDefaultAtoms() override {
ExecutableWriter<ELFT>::addDefaultAtoms();
}
/// \brief Create symbol table.
unique_bump_ptr<SymbolTable<ELFT>> createSymbolTable() override;
void processUndefinedSymbol(StringRef symName,
RuntimeFile<ELFT> &file) const override;
// Setup the ELF header.
std::error_code setELFHeader() override;
private:
ARMLinkingContext &_context;
ARMTargetLayout<ELFT> &_armLayout;
};
template <class ELFT>
ARMExecutableWriter<ELFT>::ARMExecutableWriter(ARMLinkingContext &context,
ARMTargetLayout<ELFT> &layout)
: ExecutableWriter<ELFT>(context, layout), _context(context),
_armLayout(layout) {}
template <class ELFT>
bool ARMExecutableWriter<ELFT>::createImplicitFiles(
std::vector<std::unique_ptr<File>> &result) {
ExecutableWriter<ELFT>::createImplicitFiles(result);
return true;
}
template <class ELFT>
void ARMExecutableWriter<ELFT>::finalizeDefaultAtomValues() {
// Finalize the atom values that are part of the parent.
ExecutableWriter<ELFT>::finalizeDefaultAtomValues();
auto gotAtomIter = _armLayout.findAbsoluteAtom(gotSymbol);
if (gotAtomIter != _armLayout.absoluteAtoms().end()) {
auto *gotAtom = *gotAtomIter;
if (auto gotpltSection = _armLayout.findOutputSection(".got.plt"))
gotAtom->_virtualAddr = gotpltSection->virtualAddr();
else if (auto gotSection = _armLayout.findOutputSection(".got"))
gotAtom->_virtualAddr = gotSection->virtualAddr();
else
gotAtom->_virtualAddr = 0;
}
// TODO: resolve addresses of __exidx_start/_end atoms
}
template <class ELFT>
unique_bump_ptr<SymbolTable<ELFT>>
ARMExecutableWriter<ELFT>::createSymbolTable() {
return unique_bump_ptr<SymbolTable<ELFT>>(
new (this->_alloc) ARMSymbolTable<ELFT>(this->_context));
}
template <class ELFT>
void ARMExecutableWriter<ELFT>::processUndefinedSymbol(
StringRef symName, RuntimeFile<ELFT> &file) const {
if (symName == gotSymbol) {
file.addAbsoluteAtom(gotSymbol);
} else if (symName.startswith("__exidx")) {
file.addAbsoluteAtom("__exidx_start");
file.addAbsoluteAtom("__exidx_end");
}
}
template <class ELFT>
std::error_code ARMExecutableWriter<ELFT>::setELFHeader() {
if (std::error_code ec = ExecutableWriter<ELFT>::setELFHeader())
return ec;
// Fixup entry point for Thumb code.
StringRef entryName = _context.entrySymbolName();
if (const AtomLayout *al = _armLayout.findAtomLayoutByName(entryName)) {
const auto *ea = dyn_cast<DefinedAtom>(al->_atom);
if (ea && ea->codeModel() == DefinedAtom::codeARMThumb)
this->_elfHeader->e_entry(al->_virtualAddr | 0x1);
}
return std::error_code();
}
} // namespace elf
} // namespace lld
#endif // LLD_READER_WRITER_ELF_ARM_ARM_EXECUTABLE_WRITER_H
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