1//===- Relocation.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/Fragment/Relocation.h> 10#include <mcld/LD/Relocator.h> 11#include <mcld/LD/ResolveInfo.h> 12#include <mcld/LD/LDSymbol.h> 13#include <mcld/LD/LDSection.h> 14#include <mcld/LD/SectionData.h> 15#include <mcld/Support/MsgHandling.h> 16#include <mcld/LD/RelocationFactory.h> 17 18#include <llvm/Support/ManagedStatic.h> 19 20using namespace mcld; 21 22static llvm::ManagedStatic<RelocationFactory> g_RelocationFactory; 23 24//===----------------------------------------------------------------------===// 25// Relocation Factory Methods 26//===----------------------------------------------------------------------===// 27/// Initialize - set up the relocation factory 28void Relocation::SetUp(const LinkerConfig& pConfig) 29{ 30 g_RelocationFactory->setConfig(pConfig); 31} 32 33/// Clear - Clean up the relocation factory 34void Relocation::Clear() 35{ 36 g_RelocationFactory->clear(); 37} 38 39/// Create - produce an empty relocation entry 40Relocation* Relocation::Create() 41{ 42 return g_RelocationFactory->produceEmptyEntry(); 43} 44 45/// Create - produce a relocation entry 46/// @param pType [in] the type of the relocation entry 47/// @param pFragRef [in] the place to apply the relocation 48/// @param pAddend [in] the addend of the relocation entry 49Relocation* Relocation::Create(Type pType, FragmentRef& pFragRef, Address pAddend) 50{ 51 return g_RelocationFactory->produce(pType, pFragRef, pAddend); 52} 53 54/// Destroy - destroy a relocation entry 55void Relocation::Destroy(Relocation*& pRelocation) 56{ 57 g_RelocationFactory->destroy(pRelocation); 58 pRelocation = NULL; 59} 60 61//===----------------------------------------------------------------------===// 62// Relocation 63//===----------------------------------------------------------------------===// 64Relocation::Relocation() 65 : m_Type(0x0), m_TargetData(0x0), m_pSymInfo(NULL), m_Addend(0x0) { 66} 67 68Relocation::Relocation(Relocation::Type pType, 69 FragmentRef* pTargetRef, 70 Relocation::Address pAddend, 71 Relocation::DWord pTargetData) 72 : m_Type(pType), 73 m_TargetData(pTargetData), 74 m_pSymInfo(NULL), 75 m_Addend(pAddend) 76{ 77 if(NULL != pTargetRef) 78 m_TargetAddress.assign(*pTargetRef->frag(), pTargetRef->offset()) ; 79} 80 81Relocation::~Relocation() 82{ 83} 84 85Relocation::Address Relocation::place() const 86{ 87 Address sect_addr = m_TargetAddress.frag()->getParent()->getSection().addr(); 88 return sect_addr + m_TargetAddress.getOutputOffset(); 89} 90 91Relocation::Address Relocation::symValue() const 92{ 93 if (m_pSymInfo->type() == ResolveInfo::Section && 94 m_pSymInfo->outSymbol()->hasFragRef()) { 95 const FragmentRef* fragRef = m_pSymInfo->outSymbol()->fragRef(); 96 return fragRef->frag()->getParent()->getSection().addr() + 97 fragRef->getOutputOffset(); 98 } 99 return m_pSymInfo->outSymbol()->value(); 100} 101 102void Relocation::apply(Relocator& pRelocator) 103{ 104 Relocator::Result result = pRelocator.applyRelocation(*this); 105 106 switch (result) { 107 case Relocator::OK: { 108 // do nothing 109 return; 110 } 111 case Relocator::Overflow: { 112 error(diag::result_overflow) << pRelocator.getName(type()) 113 << symInfo()->name(); 114 return; 115 } 116 case Relocator::BadReloc: { 117 error(diag::result_badreloc) << pRelocator.getName(type()) 118 << symInfo()->name(); 119 return; 120 } 121 case Relocator::Unsupport: { 122 fatal(diag::unsupported_relocation) << type() 123 << "mclinker@googlegroups.com"; 124 return; 125 } 126 case Relocator::Unknown: { 127 fatal(diag::unknown_relocation) << type() << symInfo()->name(); 128 return; 129 } 130 } // end of switch 131} 132 133void Relocation::setType(Type pType) 134{ 135 m_Type = pType; 136} 137 138void Relocation::setAddend(Address pAddend) 139{ 140 m_Addend = pAddend; 141} 142 143void Relocation::setSymInfo(ResolveInfo* pSym) 144{ 145 m_pSymInfo = pSym; 146} 147 148Relocation::Size Relocation::size(Relocator& pRelocator) const 149{ 150 return pRelocator.getSize(m_Type); 151} 152 153void Relocation::updateAddend() 154{ 155 // Update value keep in addend if we meet a section symbol 156 if (m_pSymInfo->type() == ResolveInfo::Section) { 157 uint32_t offset = m_pSymInfo->outSymbol()->fragRef()->getOutputOffset(); 158 m_Addend += offset; 159 } 160} 161