1//===- MipsLA25Stub.cpp ---------------------------------------------------===// 2// 3// The MCLinker Project 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9#include "mcld/LD/ResolveInfo.h" 10#include "MipsLA25Stub.h" 11#include "MipsLDBackend.h" 12 13namespace { 14 15const uint32_t STUB[] = { 16 0x3c190000, // lui $25,%hi(func) 17 0x08000000, // j func 18 0x27390000, // add $25,$25,%lo(func) 19 0x00000000 // nop 20}; 21 22} // anonymous namespace 23 24namespace mcld { 25 26//===----------------------------------------------------------------------===// 27// MipsLA25Stub 28//===----------------------------------------------------------------------===// 29 30MipsLA25Stub::MipsLA25Stub(const MipsGNULDBackend& pTarget) 31 : m_Target(pTarget), 32 m_Name("MipsLA25_Prototype"), 33 m_pData(STUB), 34 m_Size(sizeof(STUB)) { 35 addFixup(0, 0x0, llvm::ELF::R_MIPS_HI16); 36 addFixup(4, 0x0, llvm::ELF::R_MIPS_26); 37 addFixup(8, 0x0, llvm::ELF::R_MIPS_LO16); 38} 39 40MipsLA25Stub::MipsLA25Stub(const MipsGNULDBackend& pTarget, 41 const uint32_t* pData, 42 size_t pSize, 43 const_fixup_iterator pBegin, 44 const_fixup_iterator pEnd) 45 : m_Target(pTarget), m_Name("pic"), m_pData(pData), m_Size(pSize) { 46 for (const_fixup_iterator it = pBegin, ie = pEnd; it != ie; ++it) 47 addFixup(**it); 48} 49 50bool MipsLA25Stub::isMyDuty(const Relocation& pReloc, 51 uint64_t pSource, 52 uint64_t pTargetSymValue) const { 53 if (llvm::ELF::R_MIPS_26 != pReloc.type()) 54 return false; 55 56 const ResolveInfo* rsym = pReloc.symInfo(); 57 58 if (!rsym->isDefine()) 59 return false; 60 61 if (rsym->isDyn() || rsym->isUndef()) 62 return false; 63 64 if (!m_Target.hasNonPICBranch(rsym)) 65 return false; 66 67 return true; 68} 69 70const std::string& MipsLA25Stub::name() const { 71 return m_Name; 72} 73 74const uint8_t* MipsLA25Stub::getContent() const { 75 return reinterpret_cast<const uint8_t*>(m_pData); 76} 77 78size_t MipsLA25Stub::size() const { 79 return m_Size; 80} 81 82size_t MipsLA25Stub::alignment() const { 83 return 4; 84} 85 86Stub* MipsLA25Stub::doClone() { 87 return new MipsLA25Stub( 88 m_Target, m_pData, m_Size, fixup_begin(), fixup_end()); 89} 90 91} // namespace mcld 92