122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===- THMToARMStub.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 "THMToARMStub.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// THMToARMStub 2322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 2422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t THMToARMStub::PIC_TEMPLATE[] = { 2537b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x46c04778, // bx pc ... nop 2637b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe59fc000, // ldr ip, [pc, #0] 2737b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe08cf00f, // add pc, ip, pc 2837b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x0 // dcd R_ARM_REL32(X) 2922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t THMToARMStub::TEMPLATE[] = { 3237b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x46c04778, // bx pc ... nop 3337b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe51ff004, // ldr pc, [pc, #-4] 3437b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x0 // dcd R_ARM_ABS32(X) 3522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 370dea6bc96bb52346737966839ac68644f7939f58Stephen HinesTHMToARMStub::THMToARMStub(bool pIsOutputPIC, bool pUsingThumb2) 3837b74a387bb3993387029859c2d9d051c41c724eStephen Hines : m_pData(NULL), 3937b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_Name("T2A_prototype"), 4037b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_Size(0x0), 4137b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_bUsingThumb2(pUsingThumb2) { 4222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (pIsOutputPIC) { 4322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = PIC_TEMPLATE; 4422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(PIC_TEMPLATE); 4522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(12u, -4, llvm::ELF::R_ARM_REL32); 460dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } else { 4722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = TEMPLATE; 4822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(TEMPLATE); 4922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(8u, 0x0, llvm::ELF::R_ARM_ABS32); 5022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 5122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 5222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 5322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// for doClone 5422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoTHMToARMStub::THMToARMStub(const uint32_t* pData, 5522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao size_t pSize, 5622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao const_fixup_iterator pBegin, 570dea6bc96bb52346737966839ac68644f7939f58Stephen Hines const_fixup_iterator pEnd, 580dea6bc96bb52346737966839ac68644f7939f58Stephen Hines bool pUsingThumb2) 5937b74a387bb3993387029859c2d9d051c41c724eStephen Hines : m_pData(pData), 6037b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_Name("T2A_veneer"), 6137b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_Size(pSize), 6237b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_bUsingThumb2(pUsingThumb2) { 6322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (const_fixup_iterator it = pBegin, ie = pEnd; it != ie; ++it) 6422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(**it); 6522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 6622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 6737b74a387bb3993387029859c2d9d051c41c724eStephen HinesTHMToARMStub::~THMToARMStub() { 6822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 6922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 7022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool THMToARMStub::isMyDuty(const class Relocation& pReloc, 7122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pSource, 7237b74a387bb3993387029859c2d9d051c41c724eStephen Hines uint64_t pTargetSymValue) const { 7322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao bool result = false; 7422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is ARM 7522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((pTargetSymValue & 0x1) == 0x0) { 7622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao switch (pReloc.type()) { 7722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_THM_CALL: { 7822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // FIXME: Assuming blx is available (i.e., target is armv5 or above!) 7922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // then, we do not need a stub unless the branch target is too far. 8022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t dest = pTargetSymValue + pReloc.addend() + 4u; 8122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao int64_t branch_offset = static_cast<int64_t>(dest) - pSource; 820dea6bc96bb52346737966839ac68644f7939f58Stephen Hines if (m_bUsingThumb2) { 830dea6bc96bb52346737966839ac68644f7939f58Stephen Hines if ((branch_offset > ARMGNULDBackend::THM2_MAX_FWD_BRANCH_OFFSET) || 840dea6bc96bb52346737966839ac68644f7939f58Stephen Hines (branch_offset < ARMGNULDBackend::THM2_MAX_BWD_BRANCH_OFFSET)) { 850dea6bc96bb52346737966839ac68644f7939f58Stephen Hines result = true; 860dea6bc96bb52346737966839ac68644f7939f58Stephen Hines break; 870dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } 880dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } else { 890dea6bc96bb52346737966839ac68644f7939f58Stephen Hines if ((branch_offset > ARMGNULDBackend::THM_MAX_FWD_BRANCH_OFFSET) || 900dea6bc96bb52346737966839ac68644f7939f58Stephen Hines (branch_offset < ARMGNULDBackend::THM_MAX_BWD_BRANCH_OFFSET)) { 910dea6bc96bb52346737966839ac68644f7939f58Stephen Hines result = true; 920dea6bc96bb52346737966839ac68644f7939f58Stephen Hines break; 930dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } 940dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } 9522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 9622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 9722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_THM_JUMP24: { 9822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // always need a stub to switch mode 9922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao result = true; 10022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 10122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao default: 10322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 10422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return result; 10722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10937b74a387bb3993387029859c2d9d051c41c724eStephen Hinesconst std::string& THMToARMStub::name() const { 11022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Name; 11122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11337b74a387bb3993387029859c2d9d051c41c724eStephen Hinesconst uint8_t* THMToARMStub::getContent() const { 11422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return reinterpret_cast<const uint8_t*>(m_pData); 11522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11737b74a387bb3993387029859c2d9d051c41c724eStephen Hinessize_t THMToARMStub::size() const { 11822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Size; 11922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 12022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 12137b74a387bb3993387029859c2d9d051c41c724eStephen Hinessize_t THMToARMStub::alignment() const { 12222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 4u; 12322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 12422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 12522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// for T bit of this stub 12637b74a387bb3993387029859c2d9d051c41c724eStephen Hinesuint64_t THMToARMStub::initSymValue() const { 12722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 0x1; 12822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 12922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 13037b74a387bb3993387029859c2d9d051c41c724eStephen HinesStub* THMToARMStub::doClone() { 13137b74a387bb3993387029859c2d9d051c41c724eStephen Hines return new THMToARMStub( 13237b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_pData, m_Size, fixup_begin(), fixup_end(), m_bUsingThumb2); 13322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 13437b74a387bb3993387029859c2d9d051c41c724eStephen Hines 13537b74a387bb3993387029859c2d9d051c41c724eStephen Hines} // namespace mcld 136