1 //===-- ThreadKDP.cpp -------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "ThreadKDP.h" 11 12 #include "lldb/Utility/SafeMachO.h" 13 14 #include "lldb/Breakpoint/Watchpoint.h" 15 #include "lldb/Core/State.h" 16 #include "lldb/Target/Process.h" 17 #include "lldb/Target/RegisterContext.h" 18 #include "lldb/Target/StopInfo.h" 19 #include "lldb/Target/Target.h" 20 #include "lldb/Target/Unwind.h" 21 #include "lldb/Utility/ArchSpec.h" 22 #include "lldb/Utility/DataExtractor.h" 23 #include "lldb/Utility/StreamString.h" 24 25 #include "Plugins/Process/Utility/StopInfoMachException.h" 26 #include "ProcessKDP.h" 27 #include "ProcessKDPLog.h" 28 #include "RegisterContextKDP_arm.h" 29 #include "RegisterContextKDP_arm64.h" 30 #include "RegisterContextKDP_i386.h" 31 #include "RegisterContextKDP_x86_64.h" 32 33 using namespace lldb; 34 using namespace lldb_private; 35 36 //---------------------------------------------------------------------- 37 // Thread Registers 38 //---------------------------------------------------------------------- 39 40 ThreadKDP::ThreadKDP(Process &process, lldb::tid_t tid) 41 : Thread(process, tid), m_thread_name(), m_dispatch_queue_name(), 42 m_thread_dispatch_qaddr(LLDB_INVALID_ADDRESS) { 43 Log *log = ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_THREAD); 44 LLDB_LOG(log, "this = {0}, tid = {1:x}", this, GetID()); 45 } 46 47 ThreadKDP::~ThreadKDP() { 48 Log *log = ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_THREAD); 49 LLDB_LOG(log, "this = {0}, tid = {1:x}", this, GetID()); 50 DestroyThread(); 51 } 52 53 const char *ThreadKDP::GetName() { 54 if (m_thread_name.empty()) 55 return NULL; 56 return m_thread_name.c_str(); 57 } 58 59 const char *ThreadKDP::GetQueueName() { return NULL; } 60 61 void ThreadKDP::RefreshStateAfterStop() { 62 // Invalidate all registers in our register context. We don't set "force" to 63 // true because the stop reply packet might have had some register values 64 // that were expedited and these will already be copied into the register 65 // context by the time this function gets called. The KDPRegisterContext 66 // class has been made smart enough to detect when it needs to invalidate 67 // which registers are valid by putting hooks in the register read and 68 // register supply functions where they check the process stop ID and do the 69 // right thing. 70 const bool force = false; 71 lldb::RegisterContextSP reg_ctx_sp(GetRegisterContext()); 72 if (reg_ctx_sp) 73 reg_ctx_sp->InvalidateIfNeeded(force); 74 } 75 76 bool ThreadKDP::ThreadIDIsValid(lldb::tid_t thread) { return thread != 0; } 77 78 void ThreadKDP::Dump(Log *log, uint32_t index) {} 79 80 bool ThreadKDP::ShouldStop(bool &step_more) { return true; } 81 lldb::RegisterContextSP ThreadKDP::GetRegisterContext() { 82 if (m_reg_context_sp.get() == NULL) 83 m_reg_context_sp = CreateRegisterContextForFrame(NULL); 84 return m_reg_context_sp; 85 } 86 87 lldb::RegisterContextSP 88 ThreadKDP::CreateRegisterContextForFrame(StackFrame *frame) { 89 lldb::RegisterContextSP reg_ctx_sp; 90 uint32_t concrete_frame_idx = 0; 91 92 if (frame) 93 concrete_frame_idx = frame->GetConcreteFrameIndex(); 94 95 if (concrete_frame_idx == 0) { 96 ProcessSP process_sp(CalculateProcess()); 97 if (process_sp) { 98 switch (static_cast<ProcessKDP *>(process_sp.get()) 99 ->GetCommunication() 100 .GetCPUType()) { 101 case llvm::MachO::CPU_TYPE_ARM: 102 reg_ctx_sp.reset(new RegisterContextKDP_arm(*this, concrete_frame_idx)); 103 break; 104 case llvm::MachO::CPU_TYPE_ARM64: 105 reg_ctx_sp.reset( 106 new RegisterContextKDP_arm64(*this, concrete_frame_idx)); 107 break; 108 case llvm::MachO::CPU_TYPE_I386: 109 reg_ctx_sp.reset( 110 new RegisterContextKDP_i386(*this, concrete_frame_idx)); 111 break; 112 case llvm::MachO::CPU_TYPE_X86_64: 113 reg_ctx_sp.reset( 114 new RegisterContextKDP_x86_64(*this, concrete_frame_idx)); 115 break; 116 default: 117 llvm_unreachable("Add CPU type support in KDP"); 118 } 119 } 120 } else { 121 Unwind *unwinder = GetUnwinder(); 122 if (unwinder) 123 reg_ctx_sp = unwinder->CreateRegisterContextForFrame(frame); 124 } 125 return reg_ctx_sp; 126 } 127 128 bool ThreadKDP::CalculateStopInfo() { 129 ProcessSP process_sp(GetProcess()); 130 if (process_sp) { 131 if (m_cached_stop_info_sp) { 132 SetStopInfo(m_cached_stop_info_sp); 133 } else { 134 SetStopInfo(StopInfo::CreateStopReasonWithSignal(*this, SIGSTOP)); 135 } 136 return true; 137 } 138 return false; 139 } 140 141 void ThreadKDP::SetStopInfoFrom_KDP_EXCEPTION( 142 const DataExtractor &exc_reply_packet) { 143 lldb::offset_t offset = 0; 144 uint8_t reply_command = exc_reply_packet.GetU8(&offset); 145 if (reply_command == CommunicationKDP::KDP_EXCEPTION) { 146 offset = 8; 147 const uint32_t count = exc_reply_packet.GetU32(&offset); 148 if (count >= 1) { 149 // const uint32_t cpu = exc_reply_packet.GetU32 (&offset); 150 offset += 4; // Skip the useless CPU field 151 const uint32_t exc_type = exc_reply_packet.GetU32(&offset); 152 const uint32_t exc_code = exc_reply_packet.GetU32(&offset); 153 const uint32_t exc_subcode = exc_reply_packet.GetU32(&offset); 154 // We have to make a copy of the stop info because the thread list will 155 // iterate through the threads and clear all stop infos.. 156 157 // Let the StopInfoMachException::CreateStopReasonWithMachException() 158 // function update the PC if needed as we might hit a software breakpoint 159 // and need to decrement the PC (i386 and x86_64 need this) and KDP 160 // doesn't do this for us. 161 const bool pc_already_adjusted = false; 162 const bool adjust_pc_if_needed = true; 163 164 m_cached_stop_info_sp = 165 StopInfoMachException::CreateStopReasonWithMachException( 166 *this, exc_type, 2, exc_code, exc_subcode, 0, pc_already_adjusted, 167 adjust_pc_if_needed); 168 } 169 } 170 } 171