122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===- THMToTHMStub.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 "THMToTHMStub.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// THMToTHMStub 2322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 2422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t THMToTHMStub::PIC_TEMPLATE[] = { 2537b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x46c04778, // bx pc ... nop 2637b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe59fc004, // ldr r12, [pc, #4] 2737b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe08fc00c, // add ip, pc, ip 2837b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe12fff1c, // bx ip 2937b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x0 // dcd R_ARM_REL32(X) 3022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t THMToTHMStub::TEMPLATE[] = { 3337b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x46c04778, // bx pc ... nop 3437b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe59fc000, // ldr ip, [pc, #0] 3537b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0xe12fff1c, // bx ip 3637b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x0 // dcd R_ARM_ABS32(X) 3722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 390dea6bc96bb52346737966839ac68644f7939f58Stephen HinesTHMToTHMStub::THMToTHMStub(bool pIsOutputPIC, bool pUsingThumb2) 4037b74a387bb3993387029859c2d9d051c41c724eStephen Hines : m_pData(NULL), 4137b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_Name("T2T_prototype"), 4237b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_Size(0x0), 4337b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_bUsingThumb2(pUsingThumb2) { 4422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (pIsOutputPIC) { 4522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = PIC_TEMPLATE; 4622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(PIC_TEMPLATE); 4722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(16u, 0x0, llvm::ELF::R_ARM_REL32); 480dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } else { 4922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = TEMPLATE; 5022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(TEMPLATE); 5122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(12u, 0x0, llvm::ELF::R_ARM_ABS32); 5222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 5322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 5422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 5522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// for doClone 5622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoTHMToTHMStub::THMToTHMStub(const uint32_t* pData, 5722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao size_t pSize, 5822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao const_fixup_iterator pBegin, 590dea6bc96bb52346737966839ac68644f7939f58Stephen Hines const_fixup_iterator pEnd, 600dea6bc96bb52346737966839ac68644f7939f58Stephen Hines bool pUsingThumb2) 6137b74a387bb3993387029859c2d9d051c41c724eStephen Hines : m_pData(pData), 6237b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_Name("T2T_veneer"), 6337b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_Size(pSize), 6437b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_bUsingThumb2(pUsingThumb2) { 6522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (const_fixup_iterator it = pBegin, ie = pEnd; it != ie; ++it) 6622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(**it); 6722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 6822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 6937b74a387bb3993387029859c2d9d051c41c724eStephen HinesTHMToTHMStub::~THMToTHMStub() { 7022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 7122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 7222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool THMToTHMStub::isMyDuty(const class Relocation& pReloc, 7322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pSource, 7437b74a387bb3993387029859c2d9d051c41c724eStephen Hines uint64_t pTargetSymValue) const { 7522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao bool result = false; 7622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is THUMB 7722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((pTargetSymValue & 0x1) != 0x0) { 7822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao switch (pReloc.type()) { 7922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_THM_CALL: 8022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_THM_JUMP24: { 8122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is too far 8222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t dest = pTargetSymValue + pReloc.addend() + 4u; 8322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao int64_t branch_offset = static_cast<int64_t>(dest) - pSource; 840dea6bc96bb52346737966839ac68644f7939f58Stephen Hines if (m_bUsingThumb2) { 8537b74a387bb3993387029859c2d9d051c41c724eStephen Hines if ((branch_offset > ARMGNULDBackend::THM2_MAX_FWD_BRANCH_OFFSET) || 8637b74a387bb3993387029859c2d9d051c41c724eStephen Hines (branch_offset < ARMGNULDBackend::THM2_MAX_BWD_BRANCH_OFFSET)) { 8737b74a387bb3993387029859c2d9d051c41c724eStephen Hines result = true; 8837b74a387bb3993387029859c2d9d051c41c724eStephen Hines break; 8937b74a387bb3993387029859c2d9d051c41c724eStephen Hines } 900dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } else { 910dea6bc96bb52346737966839ac68644f7939f58Stephen Hines if ((branch_offset > ARMGNULDBackend::THM_MAX_FWD_BRANCH_OFFSET) || 920dea6bc96bb52346737966839ac68644f7939f58Stephen Hines (branch_offset < ARMGNULDBackend::THM_MAX_BWD_BRANCH_OFFSET)) { 930dea6bc96bb52346737966839ac68644f7939f58Stephen Hines result = true; 940dea6bc96bb52346737966839ac68644f7939f58Stephen Hines break; 950dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } 960dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } 9722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 9822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 9922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao default: 10022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 10122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return result; 10422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10637b74a387bb3993387029859c2d9d051c41c724eStephen Hinesconst std::string& THMToTHMStub::name() const { 10722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Name; 10822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11037b74a387bb3993387029859c2d9d051c41c724eStephen Hinesconst uint8_t* THMToTHMStub::getContent() const { 11122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return reinterpret_cast<const uint8_t*>(m_pData); 11222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11437b74a387bb3993387029859c2d9d051c41c724eStephen Hinessize_t THMToTHMStub::size() const { 11522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Size; 11622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11837b74a387bb3993387029859c2d9d051c41c724eStephen Hinessize_t THMToTHMStub::alignment() const { 11922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 4u; 12022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 12122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 12237b74a387bb3993387029859c2d9d051c41c724eStephen Hinesuint64_t THMToTHMStub::initSymValue() const { 12322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 0x1; 12422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 12522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 12637b74a387bb3993387029859c2d9d051c41c724eStephen HinesStub* THMToTHMStub::doClone() { 12737b74a387bb3993387029859c2d9d051c41c724eStephen Hines return new THMToTHMStub( 12837b74a387bb3993387029859c2d9d051c41c724eStephen Hines m_pData, m_Size, fixup_begin(), fixup_end(), m_bUsingThumb2); 12922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 13037b74a387bb3993387029859c2d9d051c41c724eStephen Hines 13137b74a387bb3993387029859c2d9d051c41c724eStephen Hines} // namespace mcld 132