ARMToARMStub.cpp revision 22add6ff3426df1a85089fe6a6e1597ee3b6f300
122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===- ARMToARMStub.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 "ARMToARMStub.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// ARMToARMStub 2222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 2322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t ARMToARMStub::PIC_TEMPLATE[] = { 2422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe59fc000, // ldr r12, [pc] 2522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe08ff00c, // add pc, pc, ip 2622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x0 // dcd R_ARM_REL32(X-4) 2722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 2822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 2922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint32_t ARMToARMStub::TEMPLATE[] = { 3022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0xe51ff004, // ldr pc, [pc, #-4] 3122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 0x0 // dcd R_ARM_ABS32(X) 3222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao}; 3322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoARMToARMStub::ARMToARMStub(bool pIsOutputPIC) 3522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao : Stub(), m_Name("A2A_prototype"), m_pData(NULL), m_Size(0x0) 3622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 3722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (pIsOutputPIC) { 3822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = PIC_TEMPLATE; 3922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(PIC_TEMPLATE); 4022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(8u, -4, llvm::ELF::R_ARM_REL32); 4122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 4222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao else { 4322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pData = TEMPLATE; 4422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Size = sizeof(TEMPLATE); 4522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao addFixup(4u, 0x0, llvm::ELF::R_ARM_ABS32); 4622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 4722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 4822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 4922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// for doClone 5022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoARMToARMStub::ARMToARMStub(const uint32_t* pData, 5122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao size_t pSize, 5222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao const_fixup_iterator pBegin, 5322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao const_fixup_iterator pEnd) 5422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao : Stub(), m_Name("A2A_veneer"), m_pData(pData), m_Size(pSize) 5522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 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 6022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoARMToARMStub::~ARMToARMStub() 6122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 6222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 6322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 6422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ARMToARMStub::isMyDuty(const class Relocation& pReloc, 6522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pSource, 6622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t pTargetSymValue) const 6722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 6822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao bool result = false; 6922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is ARM 7022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((pTargetSymValue & 0x1) == 0x0) { 7122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao switch (pReloc.type()) { 7222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_CALL: 7322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_JUMP24: 7422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::R_ARM_PLT32: { 7522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // Check if the branch target is too far 7622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint64_t dest = pTargetSymValue + pReloc.addend() + 8u; 7722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao int64_t branch_offset = static_cast<int64_t>(dest) - pSource; 7822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if ((branch_offset > ARMGNULDBackend::ARM_MAX_FWD_BRANCH_OFFSET) || 7922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (branch_offset < ARMGNULDBackend::ARM_MAX_BWD_BRANCH_OFFSET)) { 8022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao result = true; 8122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 8322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao default: 8522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 8622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 8822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return result; 8922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 9022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 9122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst std::string& ARMToARMStub::name() const 9222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 9322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Name; 9422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 9522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 9622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaoconst uint8_t* ARMToARMStub::getContent() const 9722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 9822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return reinterpret_cast<const uint8_t*>(m_pData); 9922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaosize_t ARMToARMStub::size() const 10222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 10322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return m_Size; 10422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 10522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 10622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaosize_t ARMToARMStub::alignment() const 10722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 10822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return 4u; 10922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 11122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoStub* ARMToARMStub::doClone() 11222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao{ 11322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return new ARMToARMStub(m_pData, m_Size, fixup_begin(), fixup_end()); 11422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao} 11522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 116