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109 lines
3.0 KiB
109 lines
3.0 KiB
//===- ARMToARMStub.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 "ARMToARMStub.h"
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#include "ARMLDBackend.h"
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#include "mcld/Fragment/Relocation.h"
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#include "mcld/LD/LDSymbol.h"
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#include "mcld/LD/ResolveInfo.h"
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#include <llvm/Support/ELF.h>
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namespace mcld {
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//===----------------------------------------------------------------------===//
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// ARMToARMStub
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//===----------------------------------------------------------------------===//
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const uint32_t ARMToARMStub::PIC_TEMPLATE[] = {
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0xe59fc000, // ldr r12, [pc]
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0xe08ff00c, // add pc, pc, ip
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0x0 // dcd R_ARM_REL32(X-4)
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};
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const uint32_t ARMToARMStub::TEMPLATE[] = {
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0xe51ff004, // ldr pc, [pc, #-4]
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0x0 // dcd R_ARM_ABS32(X)
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};
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ARMToARMStub::ARMToARMStub(bool pIsOutputPIC)
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: m_pData(NULL), m_Name("A2A_prototype"), m_Size(0x0) {
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if (pIsOutputPIC) {
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m_pData = PIC_TEMPLATE;
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m_Size = sizeof(PIC_TEMPLATE);
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addFixup(8u, -4, llvm::ELF::R_ARM_REL32);
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} else {
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m_pData = TEMPLATE;
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m_Size = sizeof(TEMPLATE);
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addFixup(4u, 0x0, llvm::ELF::R_ARM_ABS32);
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}
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}
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/// for doClone
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ARMToARMStub::ARMToARMStub(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_pData(pData), m_Name("A2A_veneer"), 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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ARMToARMStub::~ARMToARMStub() {
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}
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bool ARMToARMStub::isMyDuty(const class Relocation& pReloc,
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uint64_t pSource,
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uint64_t pTargetSymValue) const {
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bool result = false;
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// Check if the branch target is ARM
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if ((pTargetSymValue & 0x1) == 0x0) {
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switch (pReloc.type()) {
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case llvm::ELF::R_ARM_PC24:
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case llvm::ELF::R_ARM_CALL:
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case llvm::ELF::R_ARM_JUMP24:
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case llvm::ELF::R_ARM_PLT32: {
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// Check if the branch target is too far
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uint64_t dest = pTargetSymValue + pReloc.addend() + 8u;
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int64_t branch_offset = static_cast<int64_t>(dest) - pSource;
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if ((branch_offset > ARMGNULDBackend::ARM_MAX_FWD_BRANCH_OFFSET) ||
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(branch_offset < ARMGNULDBackend::ARM_MAX_BWD_BRANCH_OFFSET)) {
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result = true;
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}
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break;
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}
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default:
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break;
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}
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}
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return result;
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}
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const std::string& ARMToARMStub::name() const {
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return m_Name;
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}
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const uint8_t* ARMToARMStub::getContent() const {
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return reinterpret_cast<const uint8_t*>(m_pData);
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}
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size_t ARMToARMStub::size() const {
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return m_Size;
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}
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size_t ARMToARMStub::alignment() const {
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return 4u;
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}
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Stub* ARMToARMStub::doClone() {
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return new ARMToARMStub(m_pData, m_Size, fixup_begin(), fixup_end());
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}
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} // namespace mcld
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