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