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 #include "lldb/Host/Debug.h"
25 #include "lldb/Host/HostThread.h"
26 #include "lldb/Host/Pipe.h"
27 #include "lldb/Host/common/NativeProcessProtocol.h"
28 #include "lldb/Target/MemoryRegionInfo.h"
29 #include "lldb/Utility/ArchSpec.h"
30 #include "lldb/Utility/FileSpec.h"
31 #include "lldb/lldb-types.h"
33 #include "LaunchFlavor.h"
34 #include "MachException.h"
35 #include "NativeThreadDarwin.h"
36 #include "NativeThreadListDarwin.h"
38 namespace lldb_private {
42 namespace process_darwin {
44 /// @class NativeProcessDarwin
45 /// Manages communication with the inferior (debugee) process.
47 /// Upon construction, this class prepares and launches an inferior process
50 /// Changes in the inferior process state are broadcasted.
51 class NativeProcessDarwin : public NativeProcessProtocol {
52 friend Status NativeProcessProtocol::Launch(
53 ProcessLaunchInfo &launch_info, NativeDelegate &native_delegate,
54 MainLoop &mainloop, NativeProcessProtocolSP &process_sp);
56 friend Status NativeProcessProtocol::Attach(
57 lldb::pid_t pid, NativeProcessProtocol::NativeDelegate &native_delegate,
58 MainLoop &mainloop, NativeProcessProtocolSP &process_sp);
61 ~NativeProcessDarwin() override;
63 // -----------------------------------------------------------------
64 // NativeProcessProtocol Interface
65 // -----------------------------------------------------------------
66 Status Resume(const ResumeActionList &resume_actions) override;
68 Status Halt() override;
70 Status Detach() override;
72 Status Signal(int signo) override;
74 Status Interrupt() override;
76 Status Kill() override;
78 Status GetMemoryRegionInfo(lldb::addr_t load_addr,
79 MemoryRegionInfo &range_info) override;
81 Status ReadMemory(lldb::addr_t addr, void *buf, size_t size,
82 size_t &bytes_read) override;
84 Status ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf, size_t size,
85 size_t &bytes_read) override;
87 Status WriteMemory(lldb::addr_t addr, const void *buf, size_t size,
88 size_t &bytes_written) override;
90 Status AllocateMemory(size_t size, uint32_t permissions,
91 lldb::addr_t &addr) override;
93 Status DeallocateMemory(lldb::addr_t addr) override;
95 lldb::addr_t GetSharedLibraryInfoAddress() override;
97 size_t UpdateThreads() override;
99 bool GetArchitecture(ArchSpec &arch) const override;
101 Status SetBreakpoint(lldb::addr_t addr, uint32_t size,
102 bool hardware) override;
104 void DoStopIDBumped(uint32_t newBumpId) override;
106 Status GetLoadedModuleFileSpec(const char *module_path,
107 FileSpec &file_spec) override;
109 Status 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 Status 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;
199 // -----------------------------------------------------------------
200 // Private Instance Methods
201 // -----------------------------------------------------------------
202 NativeProcessDarwin(lldb::pid_t pid, int pty_master_fd);
204 // -----------------------------------------------------------------
205 /// Finalize the launch.
207 /// This method associates the NativeProcessDarwin instance with the host
208 /// process that was just launched. It peforms actions like attaching a
209 /// listener to the inferior exception port, ptracing the process, and the
212 /// @param[in] launch_flavor
213 /// The launch flavor that was used to launch the process.
215 /// @param[in] main_loop
216 /// The main loop that will run the process monitor. Work
217 /// that needs to be done (e.g. reading files) gets registered
218 /// here along with callbacks to process the work.
221 /// Any error that occurred during the aforementioned
222 /// operations. Failure here will force termination of the
223 /// launched process and debugging session.
224 // -----------------------------------------------------------------
225 Status FinalizeLaunch(LaunchFlavor launch_flavor, MainLoop &main_loop);
227 Status SaveExceptionPortInfo();
229 void ExceptionMessageReceived(const MachException::Message &message);
231 void MaybeRaiseThreadPriority();
233 Status StartExceptionThread();
235 Status SendInferiorExitStatusToMainLoop(::pid_t pid, int status);
237 Status HandleWaitpidResult();
239 bool ProcessUsingSpringBoard() const;
241 bool ProcessUsingBackBoard() const;
243 static void *ExceptionThread(void *arg);
245 void *DoExceptionThread();
247 lldb::addr_t GetDYLDAllImageInfosAddress(Status &error) const;
249 static uint32_t GetCPUTypeForLocalProcess(::pid_t pid);
251 uint32_t GetCPUType() const;
253 task_t ExceptionMessageBundleComplete();
255 void StartSTDIOThread();
257 Status StartWaitpidThread(MainLoop &main_loop);
259 static void *WaitpidThread(void *arg);
261 void *DoWaitpidThread();
263 task_t TaskPortForProcessID(Status &error, bool force = false) const;
265 /// Attaches to an existing process. Forms the implementation of
266 /// Process::DoAttach.
267 void AttachToInferior(MainLoop &mainloop, lldb::pid_t pid, Status &error);
269 ::pid_t Attach(lldb::pid_t pid, Status &error);
271 Status PrivateResume();
273 Status ReplyToAllExceptions();
277 bool IsTaskValid() const;
279 bool IsTaskValid(task_t task) const;
281 mach_port_t GetExceptionPort() const;
283 bool IsExceptionPortValid() const;
285 Status GetTaskBasicInfo(task_t task, struct task_basic_info *info) const;
287 Status SuspendTask();
289 static Status SetDefaultPtraceOpts(const lldb::pid_t);
291 static void *MonitorThread(void *baton);
293 void MonitorCallback(lldb::pid_t pid, bool exited, int signal, int status);
295 void WaitForNewThread(::pid_t tid);
297 void MonitorSIGTRAP(const siginfo_t &info, NativeThreadDarwin &thread);
299 void MonitorTrace(NativeThreadDarwin &thread);
301 void MonitorBreakpoint(NativeThreadDarwin &thread);
303 void MonitorWatchpoint(NativeThreadDarwin &thread, uint32_t wp_index);
305 void MonitorSignal(const siginfo_t &info, NativeThreadDarwin &thread,
308 Status SetupSoftwareSingleStepping(NativeThreadDarwin &thread);
310 bool HasThreadNoLock(lldb::tid_t thread_id);
312 bool StopTrackingThread(lldb::tid_t thread_id);
314 NativeThreadDarwinSP AddThread(lldb::tid_t thread_id);
316 Status GetSoftwareBreakpointPCOffset(uint32_t &actual_opcode_size);
318 Status FixupBreakpointPCAsNeeded(NativeThreadDarwin &thread);
320 /// Writes a siginfo_t structure corresponding to the given thread
321 /// ID to the memory region pointed to by @p siginfo.
322 Status GetSignalInfo(lldb::tid_t tid, void *siginfo);
324 /// Writes the raw event message code (vis-a-vis PTRACE_GETEVENTMSG)
325 /// corresponding to the given thread ID to the memory pointed to by @p
327 Status GetEventMessage(lldb::tid_t tid, unsigned long *message);
329 void NotifyThreadDeath(lldb::tid_t tid);
331 Status Detach(lldb::tid_t tid);
333 // This method is requests a stop on all threads which are still
334 // running. It sets up a deferred delegate notification, which will
335 // fire once threads report as stopped. The triggerring_tid will be
336 // set as the current thread (main stop reason).
337 void StopRunningThreads(lldb::tid_t triggering_tid);
339 // Notify the delegate if all threads have stopped.
340 void SignalIfAllThreadsStopped();
342 // Resume the given thread, optionally passing it the given signal.
343 // The type of resume operation (continue, single-step) depends on
344 // the state parameter.
345 Status ResumeThread(NativeThreadDarwin &thread, lldb::StateType state,
348 void ThreadWasCreated(NativeThreadDarwin &thread);
350 void SigchldHandler();
353 } // namespace process_darwin
354 } // namespace lldb_private
356 #endif /* NativeProcessDarwin_h */