1 //===-- ThreadGDBRemote.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 "ThreadGDBRemote.h" 12 13 #include "lldb/Breakpoint/Watchpoint.h" 14 #include "lldb/Core/ArchSpec.h" 15 #include "lldb/Core/DataExtractor.h" 16 #include "lldb/Core/State.h" 17 #include "lldb/Core/StreamString.h" 18 #include "lldb/Target/Platform.h" 19 #include "lldb/Target/Process.h" 20 #include "lldb/Target/RegisterContext.h" 21 #include "lldb/Target/StopInfo.h" 22 #include "lldb/Target/SystemRuntime.h" 23 #include "lldb/Target/Target.h" 24 #include "lldb/Target/Unwind.h" 25 26 #include "ProcessGDBRemote.h" 27 #include "ProcessGDBRemoteLog.h" 28 #include "Utility/StringExtractorGDBRemote.h" 29 30 using namespace lldb; 31 using namespace lldb_private; 32 33 //---------------------------------------------------------------------- 34 // Thread Registers 35 //---------------------------------------------------------------------- 36 37 ThreadGDBRemote::ThreadGDBRemote (Process &process, lldb::tid_t tid) : 38 Thread(process, tid), 39 m_thread_name (), 40 m_dispatch_queue_name (), 41 m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS) 42 { 43 ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", 44 this, 45 process.GetID(), 46 GetID()); 47 } 48 49 ThreadGDBRemote::~ThreadGDBRemote () 50 { 51 ProcessSP process_sp(GetProcess()); 52 ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", 53 this, 54 process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID, 55 GetID()); 56 DestroyThread(); 57 } 58 59 const char * 60 ThreadGDBRemote::GetName () 61 { 62 if (m_thread_name.empty()) 63 return NULL; 64 return m_thread_name.c_str(); 65 } 66 67 68 const char * 69 ThreadGDBRemote::GetQueueName () 70 { 71 // Always re-fetch the dispatch queue name since it can change 72 73 if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS) 74 { 75 ProcessSP process_sp (GetProcess()); 76 if (process_sp) 77 { 78 SystemRuntime *runtime = process_sp->GetSystemRuntime (); 79 if (runtime) 80 { 81 m_dispatch_queue_name = runtime->GetQueueNameFromThreadQAddress (m_thread_dispatch_qaddr); 82 } 83 if (m_dispatch_queue_name.length() > 0) 84 { 85 return m_dispatch_queue_name.c_str(); 86 } 87 } 88 } 89 return NULL; 90 } 91 92 queue_id_t 93 ThreadGDBRemote::GetQueueID () 94 { 95 if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS) 96 { 97 ProcessSP process_sp (GetProcess()); 98 if (process_sp) 99 { 100 SystemRuntime *runtime = process_sp->GetSystemRuntime (); 101 if (runtime) 102 { 103 return runtime->GetQueueIDFromThreadQAddress (m_thread_dispatch_qaddr); 104 } 105 } 106 } 107 return LLDB_INVALID_QUEUE_ID; 108 } 109 110 addr_t 111 ThreadGDBRemote::GetQueueLibdispatchQueueAddress () 112 { 113 addr_t dispatch_queue_t_addr = LLDB_INVALID_ADDRESS; 114 if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS) 115 { 116 ProcessSP process_sp (GetProcess()); 117 if (process_sp) 118 { 119 SystemRuntime *runtime = process_sp->GetSystemRuntime (); 120 if (runtime) 121 { 122 dispatch_queue_t_addr = runtime->GetLibdispatchQueueAddressFromThreadQAddress (m_thread_dispatch_qaddr); 123 } 124 } 125 } 126 return dispatch_queue_t_addr; 127 } 128 129 void 130 ThreadGDBRemote::WillResume (StateType resume_state) 131 { 132 int signo = GetResumeSignal(); 133 const lldb::user_id_t tid = GetProtocolID(); 134 Log *log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD)); 135 if (log) 136 log->Printf ("Resuming thread: %4.4" PRIx64 " with state: %s.", tid, StateAsCString(resume_state)); 137 138 ProcessSP process_sp (GetProcess()); 139 if (process_sp) 140 { 141 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 142 switch (resume_state) 143 { 144 case eStateSuspended: 145 case eStateStopped: 146 // Don't append anything for threads that should stay stopped. 147 break; 148 149 case eStateRunning: 150 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 151 gdb_process->m_continue_C_tids.push_back(std::make_pair(tid, signo)); 152 else 153 gdb_process->m_continue_c_tids.push_back(tid); 154 break; 155 156 case eStateStepping: 157 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 158 gdb_process->m_continue_S_tids.push_back(std::make_pair(tid, signo)); 159 else 160 gdb_process->m_continue_s_tids.push_back(tid); 161 break; 162 163 default: 164 break; 165 } 166 } 167 } 168 169 void 170 ThreadGDBRemote::RefreshStateAfterStop() 171 { 172 // Invalidate all registers in our register context. We don't set "force" to 173 // true because the stop reply packet might have had some register values 174 // that were expedited and these will already be copied into the register 175 // context by the time this function gets called. The GDBRemoteRegisterContext 176 // class has been made smart enough to detect when it needs to invalidate 177 // which registers are valid by putting hooks in the register read and 178 // register supply functions where they check the process stop ID and do 179 // the right thing. 180 const bool force = false; 181 GetRegisterContext()->InvalidateIfNeeded (force); 182 } 183 184 bool 185 ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread) 186 { 187 return thread != 0; 188 } 189 190 void 191 ThreadGDBRemote::Dump(Log *log, uint32_t index) 192 { 193 } 194 195 196 bool 197 ThreadGDBRemote::ShouldStop (bool &step_more) 198 { 199 return true; 200 } 201 lldb::RegisterContextSP 202 ThreadGDBRemote::GetRegisterContext () 203 { 204 if (m_reg_context_sp.get() == NULL) 205 m_reg_context_sp = CreateRegisterContextForFrame (NULL); 206 return m_reg_context_sp; 207 } 208 209 lldb::RegisterContextSP 210 ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame) 211 { 212 lldb::RegisterContextSP reg_ctx_sp; 213 uint32_t concrete_frame_idx = 0; 214 215 if (frame) 216 concrete_frame_idx = frame->GetConcreteFrameIndex (); 217 218 219 if (concrete_frame_idx == 0) 220 { 221 ProcessSP process_sp (GetProcess()); 222 if (process_sp) 223 { 224 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 225 // read_all_registers_at_once will be true if 'p' packet is not supported. 226 bool read_all_registers_at_once = !gdb_process->GetGDBRemote().GetpPacketSupported (GetID()); 227 reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once)); 228 } 229 } 230 else 231 { 232 Unwind *unwinder = GetUnwinder (); 233 if (unwinder) 234 reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame); 235 } 236 return reg_ctx_sp; 237 } 238 239 bool 240 ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response) 241 { 242 GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get()); 243 assert (gdb_reg_ctx); 244 return gdb_reg_ctx->PrivateSetRegisterValue (reg, response); 245 } 246 247 bool 248 ThreadGDBRemote::CalculateStopInfo () 249 { 250 ProcessSP process_sp (GetProcess()); 251 if (process_sp) 252 { 253 StringExtractorGDBRemote stop_packet; 254 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 255 if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetProtocolID(), stop_packet)) 256 return gdb_process->SetThreadStopInfo (stop_packet) == eStateStopped; 257 } 258 return false; 259 } 260 261 262