9931f95bac
The following are the most significant peculiarities of MIPS target: - MIPS ABI requires some special tags in the dynamic table. - GOT consists of two parts local and global. The local part contains entries refer locally visible symbols. The global part contains entries refer global symbols. - Entries in the .dynsym section which have corresponded entries in the GOT should be: * Emitted at the end of .dynsym section * Sorted accordingly to theirs GOT counterparts - There are "paired" relocations. One or more R_MIPS_HI16 and R_MIPS_GOT16 relocations should be followed by R_MIPS_LO16 relocation. To calculate result of R_MIPS_HI16 and R_MIPS_GOT16 relocations we need to combine addends from these relocations and paired R_MIPS_LO16 relocation. The patch reviewed by Michael Spencer, Shankar Easwaran, Rui Ueyama. http://llvm-reviews.chandlerc.com/D2156 llvm-svn: 197342
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
//===- lib/ReaderWriter/ELF/DefaultTargetHandler.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_DEFAULT_TARGET_HANDLER_H
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#define LLD_READER_WRITER_ELF_DEFAULT_TARGET_HANDLER_H
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#include "DefaultLayout.h"
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#include "TargetHandler.h"
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#include "lld/ReaderWriter/ELFLinkingContext.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/ELF.h"
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namespace lld {
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namespace elf {
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template <class ELFT>
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class DefaultTargetHandler : public TargetHandler<ELFT> {
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public:
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DefaultTargetHandler(ELFLinkingContext &context)
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: TargetHandler<ELFT>(context) {}
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bool doesOverrideELFHeader() { return false; }
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void setELFHeader(ELFHeader<ELFT> *elfHeader) {
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llvm_unreachable("Target should provide implementation for function ");
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}
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/// TargetAtomHandler
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TargetAtomHandler<ELFT> &targetAtomHandler() {
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llvm_unreachable("Target should provide implementation for function ");
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}
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const TargetRelocationHandler<ELFT> &getRelocationHandler() const {
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llvm_unreachable("Target should provide implementation for function ");
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}
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/// Create a set of Default target sections that a target might needj
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void createDefaultSections() {}
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/// \brief Add a section to the current Layout
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void addSection(Section<ELFT> *section) {}
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/// \brief add new symbol file
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bool createImplicitFiles(std::vector<std::unique_ptr<File> > &) {
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return true;
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}
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/// \brief Finalize the symbol values
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void finalizeSymbolValues() {}
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/// \brief allocate Commons, some architectures may move small common
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/// symbols over to small data, this would also be used
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void allocateCommons() {}
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/// \brief create dynamic table
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LLD_UNIQUE_BUMP_PTR(DynamicTable<ELFT>) createDynamicTable() {
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return LLD_UNIQUE_BUMP_PTR(DynamicTable<ELFT>)(
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new (_alloc) DynamicTable<ELFT>(
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this->_context, ".dynamic", DefaultLayout<ELFT>::ORDER_DYNAMIC));
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}
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/// \brief create dynamic symbol table
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LLD_UNIQUE_BUMP_PTR(DynamicSymbolTable<ELFT>) createDynamicSymbolTable() {
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return LLD_UNIQUE_BUMP_PTR(DynamicSymbolTable<ELFT>)(
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new (_alloc) DynamicSymbolTable<ELFT>(
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this->_context, ".dynsym",
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DefaultLayout<ELFT>::ORDER_DYNAMIC_SYMBOLS));
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}
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private:
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llvm::BumpPtrAllocator _alloc;
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};
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} // end namespace elf
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} // end namespace lld
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#endif
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