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 11 #include "ThreadKDP.h" 12 13 #include "llvm/Support/MachO.h" 14 15 #include "lldb/Core/ArchSpec.h" 16 #include "lldb/Core/DataExtractor.h" 17 #include "lldb/Core/StreamString.h" 18 #include "lldb/Core/State.h" 19 #include "lldb/Target/Process.h" 20 #include "lldb/Target/RegisterContext.h" 21 #include "lldb/Target/StopInfo.h" 22 #include "lldb/Target/Target.h" 23 #include "lldb/Target/Unwind.h" 24 #include "lldb/Breakpoint/Watchpoint.h" 25 26 #include "ProcessKDP.h" 27 #include "ProcessKDPLog.h" 28 #include "RegisterContextKDP_arm.h" 29 #include "RegisterContextKDP_i386.h" 30 #include "RegisterContextKDP_x86_64.h" 31 #include "Plugins/Process/Utility/StopInfoMachException.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), 42 m_thread_name (), 43 m_dispatch_queue_name (), 44 m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS) 45 { 46 ProcessKDPLog::LogIf(KDP_LOG_THREAD, "%p: ThreadKDP::ThreadKDP (tid = 0x%4.4x)", this, GetID()); 47 } 48 49 ThreadKDP::~ThreadKDP () 50 { 51 ProcessKDPLog::LogIf(KDP_LOG_THREAD, "%p: ThreadKDP::~ThreadKDP (tid = 0x%4.4x)", this, GetID()); 52 DestroyThread(); 53 } 54 55 const char * 56 ThreadKDP::GetName () 57 { 58 if (m_thread_name.empty()) 59 return NULL; 60 return m_thread_name.c_str(); 61 } 62 63 const char * 64 ThreadKDP::GetQueueName () 65 { 66 return NULL; 67 } 68 69 void 70 ThreadKDP::RefreshStateAfterStop() 71 { 72 // Invalidate all registers in our register context. We don't set "force" to 73 // true because the stop reply packet might have had some register values 74 // that were expedited and these will already be copied into the register 75 // context by the time this function gets called. The KDPRegisterContext 76 // class has been made smart enough to detect when it needs to invalidate 77 // which registers are valid by putting hooks in the register read and 78 // register supply functions where they check the process stop ID and do 79 // the right thing. 80 const bool force = false; 81 lldb::RegisterContextSP reg_ctx_sp (GetRegisterContext()); 82 if (reg_ctx_sp) 83 reg_ctx_sp->InvalidateIfNeeded (force); 84 } 85 86 bool 87 ThreadKDP::ThreadIDIsValid (lldb::tid_t thread) 88 { 89 return thread != 0; 90 } 91 92 void 93 ThreadKDP::Dump(Log *log, uint32_t index) 94 { 95 } 96 97 98 bool 99 ThreadKDP::ShouldStop (bool &step_more) 100 { 101 return true; 102 } 103 lldb::RegisterContextSP 104 ThreadKDP::GetRegisterContext () 105 { 106 if (m_reg_context_sp.get() == NULL) 107 m_reg_context_sp = CreateRegisterContextForFrame (NULL); 108 return m_reg_context_sp; 109 } 110 111 lldb::RegisterContextSP 112 ThreadKDP::CreateRegisterContextForFrame (StackFrame *frame) 113 { 114 lldb::RegisterContextSP reg_ctx_sp; 115 uint32_t concrete_frame_idx = 0; 116 117 if (frame) 118 concrete_frame_idx = frame->GetConcreteFrameIndex (); 119 120 if (concrete_frame_idx == 0) 121 { 122 ProcessSP process_sp (CalculateProcess()); 123 if (process_sp) 124 { 125 switch (static_cast<ProcessKDP *>(process_sp.get())->GetCommunication().GetCPUType()) 126 { 127 case llvm::MachO::CPUTypeARM: 128 reg_ctx_sp.reset (new RegisterContextKDP_arm (*this, concrete_frame_idx)); 129 break; 130 case llvm::MachO::CPUTypeI386: 131 reg_ctx_sp.reset (new RegisterContextKDP_i386 (*this, concrete_frame_idx)); 132 break; 133 case llvm::MachO::CPUTypeX86_64: 134 reg_ctx_sp.reset (new RegisterContextKDP_x86_64 (*this, concrete_frame_idx)); 135 break; 136 default: 137 assert (!"Add CPU type support in KDP"); 138 break; 139 } 140 } 141 } 142 else 143 { 144 Unwind *unwinder = GetUnwinder (); 145 if (unwinder) 146 reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame); 147 } 148 return reg_ctx_sp; 149 } 150 151 lldb::StopInfoSP 152 ThreadKDP::GetPrivateStopReason () 153 { 154 ProcessSP process_sp (GetProcess()); 155 if (process_sp) 156 { 157 const uint32_t process_stop_id = process_sp->GetStopID(); 158 if (m_thread_stop_reason_stop_id != process_stop_id || 159 (m_actual_stop_info_sp && !m_actual_stop_info_sp->IsValid())) 160 { 161 if (IsStillAtLastBreakpointHit()) 162 return m_actual_stop_info_sp; 163 164 if (m_cached_stop_info_sp) 165 SetStopInfo (m_cached_stop_info_sp); 166 else 167 SetStopInfo(StopInfo::CreateStopReasonWithSignal (*this, SIGSTOP)); 168 } 169 } 170 return m_actual_stop_info_sp; 171 } 172 173 void 174 ThreadKDP::SetStopInfoFrom_KDP_EXCEPTION (const DataExtractor &exc_reply_packet) 175 { 176 lldb::offset_t offset = 0; 177 uint8_t reply_command = exc_reply_packet.GetU8(&offset); 178 if (reply_command == CommunicationKDP::KDP_EXCEPTION) 179 { 180 offset = 8; 181 const uint32_t count = exc_reply_packet.GetU32 (&offset); 182 if (count >= 1) 183 { 184 //const uint32_t cpu = exc_reply_packet.GetU32 (&offset); 185 offset += 4; // Skip the useless CPU field 186 const uint32_t exc_type = exc_reply_packet.GetU32 (&offset); 187 const uint32_t exc_code = exc_reply_packet.GetU32 (&offset); 188 const uint32_t exc_subcode = exc_reply_packet.GetU32 (&offset); 189 // We have to make a copy of the stop info because the thread list 190 // will iterate through the threads and clear all stop infos.. 191 192 // Let the StopInfoMachException::CreateStopReasonWithMachException() 193 // function update the PC if needed as we might hit a software breakpoint 194 // and need to decrement the PC (i386 and x86_64 need this) and KDP 195 // doesn't do this for us. 196 const bool pc_already_adjusted = false; 197 const bool adjust_pc_if_needed = true; 198 199 m_cached_stop_info_sp = StopInfoMachException::CreateStopReasonWithMachException (*this, 200 exc_type, 201 2, 202 exc_code, 203 exc_subcode, 204 0, 205 pc_already_adjusted, 206 adjust_pc_if_needed); 207 } 208 } 209 } 210 211