1 //===-- NativeProcessDarwin.h --------------------------------- -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef NativeProcessDarwin_h
11 #define NativeProcessDarwin_h
13 // NOTE: this code should only be compiled on Apple Darwin systems. It is
14 // not cross-platform code and is not intended to build on any other platform.
15 // Therefore, platform-specific headers and code are okay here.
18 #include <mach/mach_types.h>
22 #include <unordered_set>
24 // Other libraries and framework includes
25 #include "lldb/Core/ArchSpec.h"
26 #include "lldb/Host/Debug.h"
27 #include "lldb/Host/FileSpec.h"
28 #include "lldb/Host/HostThread.h"
29 #include "lldb/Host/Pipe.h"
30 #include "lldb/Host/common/NativeProcessProtocol.h"
31 #include "lldb/Target/MemoryRegionInfo.h"
32 #include "lldb/lldb-types.h"
34 #include "LaunchFlavor.h"
35 #include "MachException.h"
36 #include "NativeThreadDarwin.h"
37 #include "NativeThreadListDarwin.h"
39 namespace lldb_private {
43 namespace process_darwin {
45 /// @class NativeProcessDarwin
46 /// @brief Manages communication with the inferior (debugee) process.
48 /// Upon construction, this class prepares and launches an inferior
49 /// process for debugging.
51 /// Changes in the inferior process state are broadcasted.
52 class NativeProcessDarwin : public NativeProcessProtocol {
53 friend Error NativeProcessProtocol::Launch(
54 ProcessLaunchInfo &launch_info, NativeDelegate &native_delegate,
55 MainLoop &mainloop, NativeProcessProtocolSP &process_sp);
57 friend Error NativeProcessProtocol::Attach(
58 lldb::pid_t pid, NativeProcessProtocol::NativeDelegate &native_delegate,
59 MainLoop &mainloop, NativeProcessProtocolSP &process_sp);
62 ~NativeProcessDarwin() override;
64 // -----------------------------------------------------------------
65 // NativeProcessProtocol Interface
66 // -----------------------------------------------------------------
67 Error Resume(const ResumeActionList &resume_actions) override;
69 Error Halt() override;
71 Error Detach() override;
73 Error Signal(int signo) override;
75 Error Interrupt() override;
77 Error Kill() override;
79 Error GetMemoryRegionInfo(lldb::addr_t load_addr,
80 MemoryRegionInfo &range_info) override;
82 Error ReadMemory(lldb::addr_t addr, void *buf, size_t size,
83 size_t &bytes_read) override;
85 Error ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf, size_t size,
86 size_t &bytes_read) override;
88 Error WriteMemory(lldb::addr_t addr, const void *buf, size_t size,
89 size_t &bytes_written) override;
91 Error AllocateMemory(size_t size, uint32_t permissions,
92 lldb::addr_t &addr) override;
94 Error DeallocateMemory(lldb::addr_t addr) override;
96 lldb::addr_t GetSharedLibraryInfoAddress() override;
98 size_t UpdateThreads() override;
100 bool GetArchitecture(ArchSpec &arch) const override;
102 Error SetBreakpoint(lldb::addr_t addr, uint32_t size, bool hardware) override;
104 void DoStopIDBumped(uint32_t newBumpId) override;
106 Error GetLoadedModuleFileSpec(const char *module_path,
107 FileSpec &file_spec) override;
109 Error GetFileLoadAddress(const llvm::StringRef &file_name,
110 lldb::addr_t &load_addr) override;
112 NativeThreadDarwinSP GetThreadByID(lldb::tid_t id);
114 task_t GetTask() const { return m_task; }
116 // -----------------------------------------------------------------
117 // Interface used by NativeRegisterContext-derived classes.
118 // -----------------------------------------------------------------
119 static Error PtraceWrapper(int req, lldb::pid_t pid, void *addr = nullptr,
120 void *data = nullptr, size_t data_size = 0,
121 long *result = nullptr);
123 bool SupportHardwareSingleStepping() const;
126 // -----------------------------------------------------------------
127 // NativeProcessProtocol protected interface
128 // -----------------------------------------------------------------
130 GetSoftwareBreakpointTrapOpcode(size_t trap_opcode_size_hint,
131 size_t &actual_opcode_size,
132 const uint8_t *&trap_opcode_bytes) override;
135 // -----------------------------------------------------------------
136 /// Mach task-related Member Variables
137 // -----------------------------------------------------------------
139 // The task port for the inferior process.
140 mutable task_t m_task;
142 // True if the inferior process did an exec since we started
146 // The CPU type of this process.
147 mutable cpu_type_t m_cpu_type;
149 // -----------------------------------------------------------------
150 /// Exception/Signal Handling Member Variables
151 // -----------------------------------------------------------------
153 // Exception port on which we will receive child exceptions
154 mach_port_t m_exception_port;
156 // Saved state of the child exception port prior to us installing
157 // our own intercepting port.
158 MachException::PortInfo m_exc_port_info;
160 // The thread that runs the Mach exception read and reply handler.
161 pthread_t m_exception_thread;
163 // TODO see if we can remove this if we get the exception collection
164 // and distribution to happen in a single-threaded fashion.
165 std::recursive_mutex m_exception_messages_mutex;
167 // A collection of exception messages caught when listening to the
169 MachException::Message::collection m_exception_messages;
171 // When we call MachProcess::Interrupt(), we want to send this
172 // signal (if non-zero).
173 int m_sent_interrupt_signo;
175 // If we resume the process and still haven't received our
176 // interrupt signal (if this is non-zero).
177 int m_auto_resume_signo;
179 // -----------------------------------------------------------------
180 /// Thread-related Member Variables
181 // -----------------------------------------------------------------
182 NativeThreadListDarwin m_thread_list;
183 ResumeActionList m_thread_actions;
185 // -----------------------------------------------------------------
186 /// Process Lifetime Member Variable
187 // -----------------------------------------------------------------
189 // The pipe over which the waitpid thread and the main loop will
193 // The thread that runs the waitpid handler.
194 pthread_t m_waitpid_thread;
196 // waitpid reader callback handle.
197 MainLoop::ReadHandleUP m_waitpid_reader_handle;
202 LazyBool m_supports_mem_region;
203 std::vector<MemoryRegionInfo> m_mem_region_cache;
205 lldb::tid_t m_pending_notification_tid;
207 // List of thread ids stepping with a breakpoint with the address of
208 // the relevan breakpoint
209 std::map<lldb::tid_t, lldb::addr_t>
210 m_threads_stepping_with_breakpoint;
213 // -----------------------------------------------------------------
214 // Private Instance Methods
215 // -----------------------------------------------------------------
216 NativeProcessDarwin(lldb::pid_t pid, int pty_master_fd);
218 // -----------------------------------------------------------------
219 /// Finalize the launch.
221 /// This method associates the NativeProcessDarwin instance with
222 /// the host process that was just launched. It peforms actions
223 /// like attaching a listener to the inferior exception port,
224 /// ptracing the process, and the like.
226 /// @param[in] launch_flavor
227 /// The launch flavor that was used to launch the process.
229 /// @param[in] main_loop
230 /// The main loop that will run the process monitor. Work
231 /// that needs to be done (e.g. reading files) gets registered
232 /// here along with callbacks to process the work.
235 /// Any error that occurred during the aforementioned
236 /// operations. Failure here will force termination of the
237 /// launched process and debugging session.
238 // -----------------------------------------------------------------
239 Error FinalizeLaunch(LaunchFlavor launch_flavor, MainLoop &main_loop);
241 Error SaveExceptionPortInfo();
243 void ExceptionMessageReceived(const MachException::Message &message);
245 void MaybeRaiseThreadPriority();
247 Error StartExceptionThread();
249 Error SendInferiorExitStatusToMainLoop(::pid_t pid, int status);
251 Error HandleWaitpidResult();
253 bool ProcessUsingSpringBoard() const;
255 bool ProcessUsingBackBoard() const;
257 static void *ExceptionThread(void *arg);
259 void *DoExceptionThread();
261 lldb::addr_t GetDYLDAllImageInfosAddress(Error &error) const;
263 static uint32_t GetCPUTypeForLocalProcess(::pid_t pid);
265 uint32_t GetCPUType() const;
267 task_t ExceptionMessageBundleComplete();
269 void StartSTDIOThread();
271 Error StartWaitpidThread(MainLoop &main_loop);
273 static void *WaitpidThread(void *arg);
275 void *DoWaitpidThread();
277 task_t TaskPortForProcessID(Error &error, bool force = false) const;
279 /// Attaches to an existing process. Forms the
280 /// implementation of Process::DoAttach.
281 void AttachToInferior(MainLoop &mainloop, lldb::pid_t pid, Error &error);
283 ::pid_t Attach(lldb::pid_t pid, Error &error);
285 Error PrivateResume();
287 Error ReplyToAllExceptions();
291 bool IsTaskValid() const;
293 bool IsTaskValid(task_t task) const;
295 mach_port_t GetExceptionPort() const;
297 bool IsExceptionPortValid() const;
299 Error GetTaskBasicInfo(task_t task, struct task_basic_info *info) const;
303 static Error SetDefaultPtraceOpts(const lldb::pid_t);
305 static void *MonitorThread(void *baton);
307 void MonitorCallback(lldb::pid_t pid, bool exited, int signal, int status);
309 void WaitForNewThread(::pid_t tid);
311 void MonitorSIGTRAP(const siginfo_t &info, NativeThreadDarwin &thread);
313 void MonitorTrace(NativeThreadDarwin &thread);
315 void MonitorBreakpoint(NativeThreadDarwin &thread);
317 void MonitorWatchpoint(NativeThreadDarwin &thread, uint32_t wp_index);
319 void MonitorSignal(const siginfo_t &info, NativeThreadDarwin &thread,
322 Error SetupSoftwareSingleStepping(NativeThreadDarwin &thread);
325 static ::ProcessMessage::CrashReason
326 GetCrashReasonForSIGSEGV(const siginfo_t *info);
328 static ::ProcessMessage::CrashReason
329 GetCrashReasonForSIGILL(const siginfo_t *info);
331 static ::ProcessMessage::CrashReason
332 GetCrashReasonForSIGFPE(const siginfo_t *info);
334 static ::ProcessMessage::CrashReason
335 GetCrashReasonForSIGBUS(const siginfo_t *info);
338 bool HasThreadNoLock(lldb::tid_t thread_id);
340 bool StopTrackingThread(lldb::tid_t thread_id);
342 NativeThreadDarwinSP AddThread(lldb::tid_t thread_id);
344 Error GetSoftwareBreakpointPCOffset(uint32_t &actual_opcode_size);
346 Error FixupBreakpointPCAsNeeded(NativeThreadDarwin &thread);
348 /// Writes a siginfo_t structure corresponding to the given thread
349 /// ID to the memory region pointed to by @p siginfo.
350 Error GetSignalInfo(lldb::tid_t tid, void *siginfo);
352 /// Writes the raw event message code (vis-a-vis PTRACE_GETEVENTMSG)
353 /// corresponding to the given thread ID to the memory pointed to
355 Error GetEventMessage(lldb::tid_t tid, unsigned long *message);
357 void NotifyThreadDeath(lldb::tid_t tid);
359 Error Detach(lldb::tid_t tid);
361 // This method is requests a stop on all threads which are still
362 // running. It sets up a deferred delegate notification, which will
363 // fire once threads report as stopped. The triggerring_tid will be
364 // set as the current thread (main stop reason).
365 void StopRunningThreads(lldb::tid_t triggering_tid);
367 // Notify the delegate if all threads have stopped.
368 void SignalIfAllThreadsStopped();
370 // Resume the given thread, optionally passing it the given signal.
371 // The type of resume operation (continue, single-step) depends on
372 // the state parameter.
373 Error ResumeThread(NativeThreadDarwin &thread, lldb::StateType state,
376 void ThreadWasCreated(NativeThreadDarwin &thread);
378 void SigchldHandler();
381 } // namespace process_darwin
382 } // namespace lldb_private
384 #endif /* NativeProcessDarwin_h */