THMToTHMStub.cpp revision 22add6ff3426df1a85089fe6a6e1597ee3b6f300
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 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// THMToTHMStub 2222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 2322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t THMToTHMStub::PIC_TEMPLATE[] = { 2422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x46c04778, // bx pc ... nop 2522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe59fc004, // ldr r12, [pc, #4] 2622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe08fc00c, // add ip, pc, ip 2722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe12fff1c, // bx ip 2822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x0 // dcd R_ARM_REL32(X) 2922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t THMToTHMStub::TEMPLATE[] = { 3222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x46c04778, // bx pc ... nop 3322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe59fc000, // ldr ip, [pc, #0] 3422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe12fff1c, // bx ip 3522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x0 // dcd R_ARM_ABS32(X) 3622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoTHMToTHMStub::THMToTHMStub(bool pIsOutputPIC) 3922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao : Stub(), m_Name("T2T_prototype"), m_pData(NULL), m_Size(0x0) 4022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 4122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (pIsOutputPIC) { 4222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = PIC_TEMPLATE; 4322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(PIC_TEMPLATE); 4422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(16u, 0x0, llvm::ELF::R_ARM_REL32); 4522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 4622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao else { 4722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = TEMPLATE; 4822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(TEMPLATE); 4922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(12u, 0x0, llvm::ELF::R_ARM_ABS32); 5022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 5122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 5222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 5322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// for doClone 5422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoTHMToTHMStub::THMToTHMStub(const uint32_t* pData, 5522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao size_t pSize, 5622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao const_fixup_iterator pBegin, 5722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao const_fixup_iterator pEnd) 5822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao : Stub(), m_Name("T2T_veneer"), m_pData(pData), m_Size(pSize) 5922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 6022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (const_fixup_iterator it = pBegin, ie = pEnd; it != ie; ++it) 6122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(**it); 6222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 6322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 6422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoTHMToTHMStub::~THMToTHMStub() 6522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 6622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 6722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 6822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool THMToTHMStub::isMyDuty(const class Relocation& pReloc, 6922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pSource, 7022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pTargetSymValue) const 7122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 7222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao bool result = false; 7322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is THUMB 7422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((pTargetSymValue & 0x1) != 0x0) { 7522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao switch (pReloc.type()) { 7622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_THM_CALL: 7722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_THM_JUMP24: { 7822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is too far 7922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t dest = pTargetSymValue + pReloc.addend() + 4u; 8022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao int64_t branch_offset = static_cast<int64_t>(dest) - pSource; 8122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((branch_offset > ARMGNULDBackend::THM_MAX_FWD_BRANCH_OFFSET) || 8222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (branch_offset < ARMGNULDBackend::THM_MAX_BWD_BRANCH_OFFSET)) 8322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao result = true; 8422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 8522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao default: 8722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 8822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 9022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return result; 9122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 9222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 9322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst std::string& THMToTHMStub::name() const 9422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 9522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Name; 9622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 9722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 9822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint8_t* THMToTHMStub::getContent() const 9922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 10022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return reinterpret_cast<const uint8_t*>(m_pData); 10122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaosize_t THMToTHMStub::size() const 10422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 10522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Size; 10622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaosize_t THMToTHMStub::alignment() const 10922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 11022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 4u; 11122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaouint64_t THMToTHMStub::initSymValue() const 11422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 11522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 0x1; 11622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoStub* THMToTHMStub::doClone() 11922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 12022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return new THMToTHMStub(m_pData, m_Size, fixup_begin(), fixup_end()); 12122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 12222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 123