1 files changed, 115 insertions, 0 deletions
diff --git a/lib/ReaderWriter/ELF/Mips/MipsDynamicTable.h b/lib/ReaderWriter/ELF/Mips/MipsDynamicTable.h
new file mode 100644
index 000000000000..2b9562f42b57
--- /dev/null
+++ b/lib/ReaderWriter/ELF/Mips/MipsDynamicTable.h
@@ -0,0 +1,115 @@
+//===- lib/ReaderWriter/ELF/Mips/MipsDynamicTable.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_DYNAMIC_TABLE_H
+#define LLD_READER_WRITER_ELF_MIPS_MIPS_DYNAMIC_TABLE_H
+
+#include "DefaultLayout.h"
+#include "SectionChunks.h"
+
+namespace lld {
+namespace elf {
+
+template <class ELFType> class MipsTargetLayout;
+
+template <class MipsELFType>
+class MipsDynamicTable : public DynamicTable<MipsELFType> {
+public:
+  MipsDynamicTable(const ELFLinkingContext &ctx,
+                   MipsTargetLayout<MipsELFType> &layout)
+      : DynamicTable<MipsELFType>(ctx, layout, ".dynamic",
+                                  DefaultLayout<MipsELFType>::ORDER_DYNAMIC),
+        _mipsTargetLayout(layout) {}
+
+  void createDefaultEntries() override {
+    DynamicTable<MipsELFType>::createDefaultEntries();
+
+    typename DynamicTable<MipsELFType>::Elf_Dyn dyn;
+
+    // Version id for the Runtime Linker Interface.
+    dyn.d_un.d_val = 1;
+    dyn.d_tag = DT_MIPS_RLD_VERSION;
+    this->addEntry(dyn);
+
+    // MIPS flags.
+    dyn.d_un.d_val = RHF_NOTPOT;
+    dyn.d_tag = DT_MIPS_FLAGS;
+    this->addEntry(dyn);
+
+    // The base address of the segment.
+    dyn.d_un.d_ptr = 0;
+    dyn.d_tag = DT_MIPS_BASE_ADDRESS;
+    _dt_baseaddr = this->addEntry(dyn);
+
+    // Number of local global offset table entries.
+    dyn.d_un.d_val = 0;
+    dyn.d_tag = DT_MIPS_LOCAL_GOTNO;
+    _dt_localgot = this->addEntry(dyn);
+
+    // Number of entries in the .dynsym section.
+    dyn.d_un.d_val = 0;
+    dyn.d_tag = DT_MIPS_SYMTABNO;
+    _dt_symtabno = this->addEntry(dyn);
+
+    // The index of the first dynamic symbol table entry that corresponds
+    // to an entry in the global offset table.
+    dyn.d_un.d_val = 0;
+    dyn.d_tag = DT_MIPS_GOTSYM;
+    _dt_gotsym = this->addEntry(dyn);
+
+    // Address of the .got section.
+    dyn.d_un.d_val = 0;
+    dyn.d_tag = DT_PLTGOT;
+    _dt_pltgot = this->addEntry(dyn);
+  }
+
+  void updateDynamicTable() override {
+    DynamicTable<MipsELFType>::updateDynamicTable();
+
+    // Assign the minimum segment address to the DT_MIPS_BASE_ADDRESS tag.
+    auto baseAddr = std::numeric_limits<uint64_t>::max();
+    for (auto si : _mipsTargetLayout.segments())
+      if (si->segmentType() != llvm::ELF::PT_NULL)
+        baseAddr = std::min(baseAddr, si->virtualAddr());
+    this->_entries[_dt_baseaddr].d_un.d_val = baseAddr;
+
+    auto &got = _mipsTargetLayout.getGOTSection();
+
+    this->_entries[_dt_symtabno].d_un.d_val = this->getSymbolTable()->size();
+    this->_entries[_dt_gotsym].d_un.d_val =
+       this-> getSymbolTable()->size() - got.getGlobalCount();
+    this->_entries[_dt_localgot].d_un.d_val = got.getLocalCount();
+    this->_entries[_dt_pltgot].d_un.d_ptr =
+        _mipsTargetLayout.findOutputSection(".got")->virtualAddr();
+  }
+
+  int64_t getGotPltTag() override { return DT_MIPS_PLTGOT; }
+
+protected:
+  /// \brief Adjust the symbol's value for microMIPS code.
+  uint64_t getAtomVirtualAddress(const AtomLayout *al) const override {
+    if (const auto *da = dyn_cast<DefinedAtom>(al->_atom))
+      if (da->codeModel() == DefinedAtom::codeMipsMicro ||
+          da->codeModel() == DefinedAtom::codeMipsMicroPIC)
+        return al->_virtualAddr | 1;
+    return al->_virtualAddr;
+  }
+
+private:
+  std::size_t _dt_symtabno;
+  std::size_t _dt_localgot;
+  std::size_t _dt_gotsym;
+  std::size_t _dt_pltgot;
+  std::size_t _dt_baseaddr;
+  MipsTargetLayout<MipsELFType> &_mipsTargetLayout;
+};
+
+} // end namespace elf
+} // end namespace lld
+
+#endif