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//===- lib/ReaderWriter/ELF/Mips/MipsELFWriters.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_MIPS_MIPS_ELF_WRITERS_H
#define LLD_READER_WRITER_ELF_MIPS_MIPS_ELF_WRITERS_H
#include "MipsLinkingContext.h"
#include "OutputELFWriter.h"
namespace lld {
namespace elf {
template <class ELFT> class MipsTargetLayout;
template <typename ELFT> class MipsELFWriter {
public:
MipsELFWriter(MipsLinkingContext &context,
MipsTargetLayout<ELFT> &targetLayout)
: _context(context), _targetLayout(targetLayout) {}
void setELFHeader(ELFHeader<ELFT> &elfHeader) {
elfHeader.e_version(1);
elfHeader.e_ident(llvm::ELF::EI_VERSION, llvm::ELF::EV_CURRENT);
elfHeader.e_ident(llvm::ELF::EI_OSABI, llvm::ELF::ELFOSABI_NONE);
if (_targetLayout.findOutputSection(".got.plt"))
elfHeader.e_ident(llvm::ELF::EI_ABIVERSION, 1);
else
elfHeader.e_ident(llvm::ELF::EI_ABIVERSION, 0);
// FIXME (simon): Read elf flags from all inputs, check compatibility,
// merge them and write result here.
uint32_t flags = llvm::ELF::EF_MIPS_NOREORDER | llvm::ELF::EF_MIPS_ABI_O32 |
llvm::ELF::EF_MIPS_CPIC | llvm::ELF::EF_MIPS_ARCH_32R2;
if (_context.getOutputELFType() == llvm::ELF::ET_DYN)
flags |= EF_MIPS_PIC;
elfHeader.e_flags(flags);
}
void finalizeMipsRuntimeAtomValues() {
if (!_context.isDynamic())
return;
auto gotSection = _targetLayout.findOutputSection(".got");
auto got = gotSection ? gotSection->virtualAddr() : 0;
auto gp = gotSection ? got + _targetLayout.getGPOffset() : 0;
setAtomValue("_GLOBAL_OFFSET_TABLE_", got);
setAtomValue("_gp", gp);
setAtomValue("_gp_disp", gp);
}
bool hasGlobalGOTEntry(const Atom *a) const {
return _targetLayout.getGOTSection().hasGlobalGOTEntry(a);
}
std::unique_ptr<MipsRuntimeFile<ELFT>> createRuntimeFile() {
auto file = llvm::make_unique<MipsRuntimeFile<ELFT>>(_context);
if (_context.isDynamic()) {
file->addAbsoluteAtom("_GLOBAL_OFFSET_TABLE_");
file->addAbsoluteAtom("_gp");
file->addAbsoluteAtom("_gp_disp");
}
return file;
}
private:
MipsLinkingContext &_context;
MipsTargetLayout<ELFT> &_targetLayout;
void setAtomValue(StringRef name, uint64_t value) {
auto atom = _targetLayout.findAbsoluteAtom(name);
assert(atom != _targetLayout.absoluteAtoms().end());
(*atom)->_virtualAddr = value;
}
};
} // elf
} // lld
#endif
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