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 1322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <llvm/Support/ELF.h> 1422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/ResolveInfo.h> 1522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/LDSymbol.h> 1622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Fragment/Relocation.h> 1722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaousing namespace mcld; 1922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 2022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 2122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// THMToARMStub 2222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 2322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t THMToARMStub::PIC_TEMPLATE[] = { 2422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x46c04778, // bx pc ... nop 2522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe59fc000, // ldr ip, [pc, #0] 2622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe08cf00f, // add pc, ip, pc 2722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x0 // dcd R_ARM_REL32(X) 2822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 2922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t THMToARMStub::TEMPLATE[] = { 3122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x46c04778, // bx pc ... nop 3222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe51ff004, // ldr pc, [pc, #-4] 3322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x0 // dcd R_ARM_ABS32(X) 3422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 36a790f0a8f3175183bea088389b3e4ae41813e192Stephen HinesTHMToARMStub::THMToARMStub(bool pIsOutputPIC, bool pUsingThumb2) 37a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines : m_pData(NULL), 38a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines m_Name("T2A_prototype"), 39a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines m_Size(0x0), 40a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines m_bUsingThumb2(pUsingThumb2) 4122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 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); 46a790f0a8f3175183bea088389b3e4ae41813e192Stephen 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, 57a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines const_fixup_iterator pEnd, 58a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines bool pUsingThumb2) 59a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines : m_pData(pData), 60a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines m_Name("T2A_veneer"), 61a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines m_Size(pSize), 62a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines m_bUsingThumb2(pUsingThumb2) 6322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 6422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (const_fixup_iterator it = pBegin, ie = pEnd; it != ie; ++it) 6522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(**it); 6622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 6722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 6822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoTHMToARMStub::~THMToARMStub() 6922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 7022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 7122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 7222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool THMToARMStub::isMyDuty(const class Relocation& pReloc, 7322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pSource, 7422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pTargetSymValue) const 7522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 7622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao bool result = false; 7722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is ARM 7822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((pTargetSymValue & 0x1) == 0x0) { 7922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao switch (pReloc.type()) { 8022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_THM_CALL: { 8122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // FIXME: Assuming blx is available (i.e., target is armv5 or above!) 8222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // then, we do not need a stub unless the branch target is too far. 8322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t dest = pTargetSymValue + pReloc.addend() + 4u; 8422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao int64_t branch_offset = static_cast<int64_t>(dest) - pSource; 85a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines if (m_bUsingThumb2) { 86a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines if ((branch_offset > ARMGNULDBackend::THM2_MAX_FWD_BRANCH_OFFSET) || 87a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines (branch_offset < ARMGNULDBackend::THM2_MAX_BWD_BRANCH_OFFSET)) { 88a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines result = true; 89a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines break; 90a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines } 91a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines } else { 92a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines if ((branch_offset > ARMGNULDBackend::THM_MAX_FWD_BRANCH_OFFSET) || 93a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines (branch_offset < ARMGNULDBackend::THM_MAX_BWD_BRANCH_OFFSET)) { 94a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines result = true; 95a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines break; 96a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines } 97a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines } 9822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 9922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_THM_JUMP24: { 10122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // always need a stub to switch mode 10222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao result = true; 10322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 10422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao default: 10622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 10722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 10922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return result; 11022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst std::string& THMToARMStub::name() const 11322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 11422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Name; 11522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint8_t* THMToARMStub::getContent() const 11822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 11922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return reinterpret_cast<const uint8_t*>(m_pData); 12022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 12122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 12222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaosize_t THMToARMStub::size() const 12322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 12422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Size; 12522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 12622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 12722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaosize_t THMToARMStub::alignment() const 12822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 12922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 4u; 13022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 13122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 13222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// for T bit of this stub 13322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaouint64_t THMToARMStub::initSymValue() const 13422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 13522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 0x1; 13622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 13722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 13822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoStub* THMToARMStub::doClone() 13922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 140a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines return new THMToARMStub(m_pData, 141a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines m_Size, 142a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines fixup_begin(), 143a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines fixup_end(), 144a790f0a8f3175183bea088389b3e4ae41813e192Stephen Hines m_bUsingThumb2); 14522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 146