122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===- ARMToTHMStub.cpp ---------------------------------------------------===// 222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// 322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// The MCLinker Project 422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// 522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// This file is distributed under the University of Illinois Open Source 622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// License. See LICENSE.TXT for details. 722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// 822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include "ARMToTHMStub.h" 1122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include "ARMLDBackend.h" 1222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1337b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/Fragment/Relocation.h" 1437b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/LD/LDSymbol.h" 1537b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/LD/ResolveInfo.h" 1637b74a387bb3993387029859c2d9d051c41c724eStephen Hines 1722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <llvm/Support/ELF.h> 1822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1937b74a387bb3993387029859c2d9d051c41c724eStephen Hinesnamespace mcld { 2022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 2122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 2222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// ARMToTHMStub 2322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 2422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t ARMToTHMStub::PIC_TEMPLATE[] = { 2537b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe59fc004, // ldr r12, [pc, #4] 2637b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe08fc00c, // add ip, pc, ip 2737b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe12fff1c, // bx ip 2837b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x0 // dcd R_ARM_REL32(X) 2922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t ARMToTHMStub::TEMPLATE[] = { 3237b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe59fc000, // ldr ip, [pc, #0] 3337b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe12fff1c, // bx ip 3437b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x0 // dcd R_ARM_ABS32(X) 3522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoARMToTHMStub::ARMToTHMStub(bool pIsOutputPIC) 3837b74a387bb3993387029859c2d9d051c41c724eStephen Hines : m_pData(NULL), m_Name("A2T_prototype"), m_Size(0x0) { 3922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (pIsOutputPIC) { 4022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = PIC_TEMPLATE; 4122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(PIC_TEMPLATE); 4222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(12u, 0x0, llvm::ELF::R_ARM_REL32); 4337b74a387bb3993387029859c2d9d051c41c724eStephen Hines } else { 4422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = TEMPLATE; 4522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(TEMPLATE); 4622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(8u, 0x0, llvm::ELF::R_ARM_ABS32); 4722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 4822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 4922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 5022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// for doClone 5122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoARMToTHMStub::ARMToTHMStub(const uint32_t* pData, 5222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao size_t pSize, 5322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao const_fixup_iterator pBegin, 5422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao const_fixup_iterator pEnd) 5537b74a387bb3993387029859c2d9d051c41c724eStephen Hines : m_pData(pData), m_Name("A2T_veneer"), m_Size(pSize) { 5622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (const_fixup_iterator it = pBegin, ie = pEnd; it != ie; ++it) 5722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(**it); 5822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 5922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 6037b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMToTHMStub::~ARMToTHMStub() { 6122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 6222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 6322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ARMToTHMStub::isMyDuty(const class Relocation& pReloc, 6422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pSource, 6537b74a387bb3993387029859c2d9d051c41c724eStephen Hines uint64_t pTargetSymValue) const { 6622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao bool result = false; 6722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is THUMB 6822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((pTargetSymValue & 0x1) != 0x0) { 6922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao switch (pReloc.type()) { 7022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_CALL: { 7122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // FIXME: Assuming blx is available (i.e., target is armv5 or above!) 7222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // then, we do not need a stub unless the branch target is too far. 7322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t dest = pTargetSymValue + pReloc.addend() + 8u; 7422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao int64_t branch_offset = static_cast<int64_t>(dest) - pSource; 7522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((branch_offset > ARMGNULDBackend::ARM_MAX_FWD_BRANCH_OFFSET) || 7622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (branch_offset < ARMGNULDBackend::ARM_MAX_BWD_BRANCH_OFFSET)) { 7722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao result = true; 7822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 7922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 8122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 82f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_PC24: 8322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_JUMP24: 8422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_PLT32: { 8522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // always need a stub to switch mode 8622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao result = true; 8722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 8822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao default: 9022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 9122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 9222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 9322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return result; 9422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 9522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 9637b74a387bb3993387029859c2d9d051c41c724eStephen Hinesconst std::string& ARMToTHMStub::name() const { 9722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Name; 9822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 9922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10037b74a387bb3993387029859c2d9d051c41c724eStephen Hinesconst uint8_t* ARMToTHMStub::getContent() const { 10122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return reinterpret_cast<const uint8_t*>(m_pData); 10222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10437b74a387bb3993387029859c2d9d051c41c724eStephen Hinessize_t ARMToTHMStub::size() const { 10522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Size; 10622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10837b74a387bb3993387029859c2d9d051c41c724eStephen Hinessize_t ARMToTHMStub::alignment() const { 10922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 4u; 11022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11237b74a387bb3993387029859c2d9d051c41c724eStephen HinesStub* ARMToTHMStub::doClone() { 11322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return new ARMToTHMStub(m_pData, m_Size, fixup_begin(), fixup_end()); 11422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11537b74a387bb3993387029859c2d9d051c41c724eStephen Hines 11637b74a387bb3993387029859c2d9d051c41c724eStephen Hines} // namespace mcld 117