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92 lines
2.4 KiB
92 lines
2.4 KiB
4 months ago
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//===- MipsLA25Stub.cpp ---------------------------------------------------===//
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//
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// The MCLinker Project
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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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#include "mcld/LD/ResolveInfo.h"
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#include "MipsLA25Stub.h"
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#include "MipsLDBackend.h"
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namespace {
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const uint32_t STUB[] = {
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0x3c190000, // lui $25,%hi(func)
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0x08000000, // j func
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0x27390000, // add $25,$25,%lo(func)
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0x00000000 // nop
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};
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} // anonymous namespace
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namespace mcld {
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//===----------------------------------------------------------------------===//
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// MipsLA25Stub
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//===----------------------------------------------------------------------===//
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MipsLA25Stub::MipsLA25Stub(const MipsGNULDBackend& pTarget)
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: m_Target(pTarget),
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m_Name("MipsLA25_Prototype"),
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m_pData(STUB),
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m_Size(sizeof(STUB)) {
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addFixup(0, 0x0, llvm::ELF::R_MIPS_HI16);
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addFixup(4, 0x0, llvm::ELF::R_MIPS_26);
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addFixup(8, 0x0, llvm::ELF::R_MIPS_LO16);
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}
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MipsLA25Stub::MipsLA25Stub(const MipsGNULDBackend& pTarget,
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const uint32_t* pData,
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size_t pSize,
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const_fixup_iterator pBegin,
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const_fixup_iterator pEnd)
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: m_Target(pTarget), m_Name("pic"), m_pData(pData), m_Size(pSize) {
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for (const_fixup_iterator it = pBegin, ie = pEnd; it != ie; ++it)
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addFixup(**it);
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}
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bool MipsLA25Stub::isMyDuty(const Relocation& pReloc,
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uint64_t pSource,
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uint64_t pTargetSymValue) const {
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if (llvm::ELF::R_MIPS_26 != pReloc.type())
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return false;
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const ResolveInfo* rsym = pReloc.symInfo();
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if (!rsym->isDefine())
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return false;
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if (rsym->isDyn() || rsym->isUndef())
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return false;
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if (!m_Target.hasNonPICBranch(rsym))
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return false;
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return true;
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}
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const std::string& MipsLA25Stub::name() const {
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return m_Name;
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}
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const uint8_t* MipsLA25Stub::getContent() const {
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return reinterpret_cast<const uint8_t*>(m_pData);
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}
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size_t MipsLA25Stub::size() const {
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return m_Size;
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}
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size_t MipsLA25Stub::alignment() const {
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return 4;
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}
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Stub* MipsLA25Stub::doClone() {
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return new MipsLA25Stub(
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m_Target, m_pData, m_Size, fixup_begin(), fixup_end());
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}
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} // namespace mcld
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