File: | build/source/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp |
Warning: | line 143, column 5 2nd function call argument is an uninitialized value |
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1 | //===-- NativeProcessLinux.cpp --------------------------------------------===// | |||
2 | // | |||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
4 | // See https://llvm.org/LICENSE.txt for license information. | |||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | ||||
9 | #include "NativeProcessLinux.h" | |||
10 | ||||
11 | #include <cerrno> | |||
12 | #include <cstdint> | |||
13 | #include <cstring> | |||
14 | #include <unistd.h> | |||
15 | ||||
16 | #include <fstream> | |||
17 | #include <mutex> | |||
18 | #include <optional> | |||
19 | #include <sstream> | |||
20 | #include <string> | |||
21 | #include <unordered_map> | |||
22 | ||||
23 | #include "NativeThreadLinux.h" | |||
24 | #include "Plugins/Process/POSIX/ProcessPOSIXLog.h" | |||
25 | #include "Plugins/Process/Utility/LinuxProcMaps.h" | |||
26 | #include "Procfs.h" | |||
27 | #include "lldb/Core/ModuleSpec.h" | |||
28 | #include "lldb/Host/Host.h" | |||
29 | #include "lldb/Host/HostProcess.h" | |||
30 | #include "lldb/Host/ProcessLaunchInfo.h" | |||
31 | #include "lldb/Host/PseudoTerminal.h" | |||
32 | #include "lldb/Host/ThreadLauncher.h" | |||
33 | #include "lldb/Host/common/NativeRegisterContext.h" | |||
34 | #include "lldb/Host/linux/Host.h" | |||
35 | #include "lldb/Host/linux/Ptrace.h" | |||
36 | #include "lldb/Host/linux/Uio.h" | |||
37 | #include "lldb/Host/posix/ProcessLauncherPosixFork.h" | |||
38 | #include "lldb/Symbol/ObjectFile.h" | |||
39 | #include "lldb/Target/Process.h" | |||
40 | #include "lldb/Target/Target.h" | |||
41 | #include "lldb/Utility/LLDBAssert.h" | |||
42 | #include "lldb/Utility/LLDBLog.h" | |||
43 | #include "lldb/Utility/State.h" | |||
44 | #include "lldb/Utility/Status.h" | |||
45 | #include "lldb/Utility/StringExtractor.h" | |||
46 | #include "llvm/ADT/ScopeExit.h" | |||
47 | #include "llvm/Support/Errno.h" | |||
48 | #include "llvm/Support/Error.h" | |||
49 | #include "llvm/Support/FileSystem.h" | |||
50 | #include "llvm/Support/Threading.h" | |||
51 | ||||
52 | #include <linux/unistd.h> | |||
53 | #include <sys/socket.h> | |||
54 | #include <sys/syscall.h> | |||
55 | #include <sys/types.h> | |||
56 | #include <sys/user.h> | |||
57 | #include <sys/wait.h> | |||
58 | ||||
59 | #ifdef __aarch64__ | |||
60 | #include <asm/hwcap.h> | |||
61 | #include <sys/auxv.h> | |||
62 | #endif | |||
63 | ||||
64 | // Support hardware breakpoints in case it has not been defined | |||
65 | #ifndef TRAP_HWBKPTTRAP_HWBKPT | |||
66 | #define TRAP_HWBKPTTRAP_HWBKPT 4 | |||
67 | #endif | |||
68 | ||||
69 | #ifndef HWCAP2_MTE(1 << 18) | |||
70 | #define HWCAP2_MTE(1 << 18) (1 << 18) | |||
71 | #endif | |||
72 | ||||
73 | using namespace lldb; | |||
74 | using namespace lldb_private; | |||
75 | using namespace lldb_private::process_linux; | |||
76 | using namespace llvm; | |||
77 | ||||
78 | // Private bits we only need internally. | |||
79 | ||||
80 | static bool ProcessVmReadvSupported() { | |||
81 | static bool is_supported; | |||
82 | static llvm::once_flag flag; | |||
83 | ||||
84 | llvm::call_once(flag, [] { | |||
85 | Log *log = GetLog(POSIXLog::Process); | |||
86 | ||||
87 | uint32_t source = 0x47424742; | |||
88 | uint32_t dest = 0; | |||
89 | ||||
90 | struct iovec local, remote; | |||
91 | remote.iov_base = &source; | |||
92 | local.iov_base = &dest; | |||
93 | remote.iov_len = local.iov_len = sizeof source; | |||
94 | ||||
95 | // We shall try if cross-process-memory reads work by attempting to read a | |||
96 | // value from our own process. | |||
97 | ssize_t res = process_vm_readv(getpid(), &local, 1, &remote, 1, 0); | |||
98 | is_supported = (res == sizeof(source) && source == dest); | |||
99 | if (is_supported) | |||
100 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Detected kernel support for process_vm_readv syscall. " "Fast memory reads enabled."); } while (0) | |||
101 | "Detected kernel support for process_vm_readv syscall. "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Detected kernel support for process_vm_readv syscall. " "Fast memory reads enabled."); } while (0) | |||
102 | "Fast memory reads enabled.")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Detected kernel support for process_vm_readv syscall. " "Fast memory reads enabled."); } while (0); | |||
103 | else | |||
104 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "syscall process_vm_readv failed (error: {0}). Fast memory " "reads disabled.", llvm::sys::StrError()); } while (0) | |||
105 | "syscall process_vm_readv failed (error: {0}). Fast memory "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "syscall process_vm_readv failed (error: {0}). Fast memory " "reads disabled.", llvm::sys::StrError()); } while (0) | |||
106 | "reads disabled.",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "syscall process_vm_readv failed (error: {0}). Fast memory " "reads disabled.", llvm::sys::StrError()); } while (0) | |||
107 | llvm::sys::StrError())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "syscall process_vm_readv failed (error: {0}). Fast memory " "reads disabled.", llvm::sys::StrError()); } while (0); | |||
108 | }); | |||
109 | ||||
110 | return is_supported; | |||
111 | } | |||
112 | ||||
113 | static void MaybeLogLaunchInfo(const ProcessLaunchInfo &info) { | |||
114 | Log *log = GetLog(POSIXLog::Process); | |||
115 | if (!log) | |||
116 | return; | |||
117 | ||||
118 | if (const FileAction *action = info.GetFileActionForFD(STDIN_FILENO0)) | |||
119 | LLDB_LOG(log, "setting STDIN to '{0}'", action->GetFileSpec())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "setting STDIN to '{0}'", action->GetFileSpec( )); } while (0); | |||
120 | else | |||
121 | LLDB_LOG(log, "leaving STDIN as is")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "leaving STDIN as is"); } while (0); | |||
122 | ||||
123 | if (const FileAction *action = info.GetFileActionForFD(STDOUT_FILENO1)) | |||
124 | LLDB_LOG(log, "setting STDOUT to '{0}'", action->GetFileSpec())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "setting STDOUT to '{0}'", action->GetFileSpec ()); } while (0); | |||
125 | else | |||
126 | LLDB_LOG(log, "leaving STDOUT as is")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "leaving STDOUT as is"); } while (0); | |||
127 | ||||
128 | if (const FileAction *action = info.GetFileActionForFD(STDERR_FILENO2)) | |||
129 | LLDB_LOG(log, "setting STDERR to '{0}'", action->GetFileSpec())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "setting STDERR to '{0}'", action->GetFileSpec ()); } while (0); | |||
130 | else | |||
131 | LLDB_LOG(log, "leaving STDERR as is")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "leaving STDERR as is"); } while (0); | |||
132 | ||||
133 | int i = 0; | |||
134 | for (const char **args = info.GetArguments().GetConstArgumentVector(); *args; | |||
135 | ++args, ++i) | |||
136 | LLDB_LOG(log, "arg {0}: '{1}'", i, *args)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "arg {0}: '{1}'", i, *args); } while (0); | |||
137 | } | |||
138 | ||||
139 | static void DisplayBytes(StreamString &s, void *bytes, uint32_t count) { | |||
140 | uint8_t *ptr = (uint8_t *)bytes; | |||
141 | const uint32_t loop_count = std::min<uint32_t>(DEBUG_PTRACE_MAXBYTES20, count); | |||
142 | for (uint32_t i = 0; i < loop_count; i++) { | |||
143 | s.Printf("[%x]", *ptr); | |||
| ||||
144 | ptr++; | |||
145 | } | |||
146 | } | |||
147 | ||||
148 | static void PtraceDisplayBytes(int &req, void *data, size_t data_size) { | |||
149 | Log *log = GetLog(POSIXLog::Ptrace); | |||
150 | if (!log
| |||
151 | return; | |||
152 | StreamString buf; | |||
153 | ||||
154 | switch (req) { | |||
155 | case PTRACE_POKETEXT: { | |||
156 | DisplayBytes(buf, &data, 8); | |||
157 | LLDB_LOGV(log, "PTRACE_POKETEXT {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private && log_private->GetVerbose()) log_private->Format ("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", __func__ , "PTRACE_POKETEXT {0}", buf.GetData()); } while (0); | |||
158 | break; | |||
159 | } | |||
160 | case PTRACE_POKEDATA: { | |||
161 | DisplayBytes(buf, &data, 8); | |||
162 | LLDB_LOGV(log, "PTRACE_POKEDATA {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private && log_private->GetVerbose()) log_private->Format ("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", __func__ , "PTRACE_POKEDATA {0}", buf.GetData()); } while (0); | |||
163 | break; | |||
164 | } | |||
165 | case PTRACE_POKEUSER: { | |||
166 | DisplayBytes(buf, &data, 8); | |||
167 | LLDB_LOGV(log, "PTRACE_POKEUSER {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private && log_private->GetVerbose()) log_private->Format ("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", __func__ , "PTRACE_POKEUSER {0}", buf.GetData()); } while (0); | |||
168 | break; | |||
169 | } | |||
170 | case PTRACE_SETREGS13: { | |||
171 | DisplayBytes(buf, data, data_size); | |||
172 | LLDB_LOGV(log, "PTRACE_SETREGS {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private && log_private->GetVerbose()) log_private->Format ("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", __func__ , "PTRACE_SETREGS {0}", buf.GetData()); } while (0); | |||
173 | break; | |||
174 | } | |||
175 | case PTRACE_SETFPREGS15: { | |||
176 | DisplayBytes(buf, data, data_size); | |||
177 | LLDB_LOGV(log, "PTRACE_SETFPREGS {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private && log_private->GetVerbose()) log_private->Format ("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", __func__ , "PTRACE_SETFPREGS {0}", buf.GetData()); } while (0); | |||
178 | break; | |||
179 | } | |||
180 | case PTRACE_SETSIGINFO: { | |||
181 | DisplayBytes(buf, data, sizeof(siginfo_t)); | |||
182 | LLDB_LOGV(log, "PTRACE_SETSIGINFO {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private && log_private->GetVerbose()) log_private->Format ("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", __func__ , "PTRACE_SETSIGINFO {0}", buf.GetData()); } while (0); | |||
183 | break; | |||
184 | } | |||
185 | case PTRACE_SETREGSETPTRACE_SETREGSET: { | |||
186 | // Extract iov_base from data, which is a pointer to the struct iovec | |||
187 | DisplayBytes(buf, *(void **)data, data_size); | |||
188 | LLDB_LOGV(log, "PTRACE_SETREGSET {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private && log_private->GetVerbose()) log_private->Format ("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", __func__ , "PTRACE_SETREGSET {0}", buf.GetData()); } while (0); | |||
189 | break; | |||
190 | } | |||
191 | default: {} | |||
192 | } | |||
193 | } | |||
194 | ||||
195 | static constexpr unsigned k_ptrace_word_size = sizeof(void *); | |||
196 | static_assert(sizeof(long) >= k_ptrace_word_size, | |||
197 | "Size of long must be larger than ptrace word size"); | |||
198 | ||||
199 | // Simple helper function to ensure flags are enabled on the given file | |||
200 | // descriptor. | |||
201 | static Status EnsureFDFlags(int fd, int flags) { | |||
202 | Status error; | |||
203 | ||||
204 | int status = fcntl(fd, F_GETFL3); | |||
205 | if (status == -1) { | |||
206 | error.SetErrorToErrno(); | |||
207 | return error; | |||
208 | } | |||
209 | ||||
210 | if (fcntl(fd, F_SETFL4, status | flags) == -1) { | |||
211 | error.SetErrorToErrno(); | |||
212 | return error; | |||
213 | } | |||
214 | ||||
215 | return error; | |||
216 | } | |||
217 | ||||
218 | static llvm::Error AddPtraceScopeNote(llvm::Error original_error) { | |||
219 | Expected<int> ptrace_scope = GetPtraceScope(); | |||
220 | if (auto E = ptrace_scope.takeError()) { | |||
221 | Log *log = GetLog(POSIXLog::Process); | |||
222 | LLDB_LOG(log, "error reading value of ptrace_scope: {0}", E)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "error reading value of ptrace_scope: {0}", E); } while (0); | |||
223 | ||||
224 | // The original error is probably more interesting than not being able to | |||
225 | // read or interpret ptrace_scope. | |||
226 | return original_error; | |||
227 | } | |||
228 | ||||
229 | // We only have suggestions to provide for 1-3. | |||
230 | switch (*ptrace_scope) { | |||
231 | case 1: | |||
232 | case 2: | |||
233 | return llvm::createStringError( | |||
234 | std::error_code(errno(*__errno_location ()), std::generic_category()), | |||
235 | "The current value of ptrace_scope is %d, which can cause ptrace to " | |||
236 | "fail to attach to a running process. To fix this, run:\n" | |||
237 | "\tsudo sysctl -w kernel.yama.ptrace_scope=0\n" | |||
238 | "For more information, see: " | |||
239 | "https://www.kernel.org/doc/Documentation/security/Yama.txt.", | |||
240 | *ptrace_scope); | |||
241 | case 3: | |||
242 | return llvm::createStringError( | |||
243 | std::error_code(errno(*__errno_location ()), std::generic_category()), | |||
244 | "The current value of ptrace_scope is 3, which will cause ptrace to " | |||
245 | "fail to attach to a running process. This value cannot be changed " | |||
246 | "without rebooting.\n" | |||
247 | "For more information, see: " | |||
248 | "https://www.kernel.org/doc/Documentation/security/Yama.txt."); | |||
249 | case 0: | |||
250 | default: | |||
251 | return original_error; | |||
252 | } | |||
253 | } | |||
254 | ||||
255 | NativeProcessLinux::Manager::Manager(MainLoop &mainloop) | |||
256 | : NativeProcessProtocol::Manager(mainloop) { | |||
257 | Status status; | |||
258 | m_sigchld_handle = mainloop.RegisterSignal( | |||
259 | SIGCHLD17, [this](MainLoopBase &) { SigchldHandler(); }, status); | |||
260 | assert(m_sigchld_handle && status.Success())(static_cast <bool> (m_sigchld_handle && status .Success()) ? void (0) : __assert_fail ("m_sigchld_handle && status.Success()" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 260, __extension__ __PRETTY_FUNCTION__)); | |||
261 | } | |||
262 | ||||
263 | llvm::Expected<std::unique_ptr<NativeProcessProtocol>> | |||
264 | NativeProcessLinux::Manager::Launch(ProcessLaunchInfo &launch_info, | |||
265 | NativeDelegate &native_delegate) { | |||
266 | Log *log = GetLog(POSIXLog::Process); | |||
267 | ||||
268 | MaybeLogLaunchInfo(launch_info); | |||
269 | ||||
270 | Status status; | |||
271 | ::pid_t pid = ProcessLauncherPosixFork() | |||
272 | .LaunchProcess(launch_info, status) | |||
273 | .GetProcessId(); | |||
274 | LLDB_LOG(log, "pid = {0:x}", pid)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid = {0:x}", pid); } while (0); | |||
275 | if (status.Fail()) { | |||
276 | LLDB_LOG(log, "failed to launch process: {0}", status)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "failed to launch process: {0}", status); } while (0); | |||
277 | return status.ToError(); | |||
278 | } | |||
279 | ||||
280 | // Wait for the child process to trap on its call to execve. | |||
281 | int wstatus = 0; | |||
282 | ::pid_t wpid = llvm::sys::RetryAfterSignal(-1, ::waitpid, pid, &wstatus, 0); | |||
283 | assert(wpid == pid)(static_cast <bool> (wpid == pid) ? void (0) : __assert_fail ("wpid == pid", "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , 283, __extension__ __PRETTY_FUNCTION__)); | |||
284 | (void)wpid; | |||
285 | if (!WIFSTOPPED(wstatus)(((wstatus) & 0xff) == 0x7f)) { | |||
286 | LLDB_LOG(log, "Could not sync with inferior process: wstatus={1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Could not sync with inferior process: wstatus={1}" , WaitStatus::Decode(wstatus)); } while (0) | |||
287 | WaitStatus::Decode(wstatus))do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Could not sync with inferior process: wstatus={1}" , WaitStatus::Decode(wstatus)); } while (0); | |||
288 | return llvm::make_error<StringError>("Could not sync with inferior process", | |||
289 | llvm::inconvertibleErrorCode()); | |||
290 | } | |||
291 | LLDB_LOG(log, "inferior started, now in stopped state")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "inferior started, now in stopped state"); } while (0); | |||
292 | ||||
293 | status = SetDefaultPtraceOpts(pid); | |||
294 | if (status.Fail()) { | |||
295 | LLDB_LOG(log, "failed to set default ptrace options: {0}", status)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "failed to set default ptrace options: {0}", status ); } while (0); | |||
296 | return status.ToError(); | |||
297 | } | |||
298 | ||||
299 | llvm::Expected<ArchSpec> arch_or = | |||
300 | NativeRegisterContextLinux::DetermineArchitecture(pid); | |||
301 | if (!arch_or) | |||
302 | return arch_or.takeError(); | |||
303 | ||||
304 | return std::unique_ptr<NativeProcessLinux>(new NativeProcessLinux( | |||
305 | pid, launch_info.GetPTY().ReleasePrimaryFileDescriptor(), native_delegate, | |||
306 | *arch_or, *this, {pid})); | |||
307 | } | |||
308 | ||||
309 | llvm::Expected<std::unique_ptr<NativeProcessProtocol>> | |||
310 | NativeProcessLinux::Manager::Attach( | |||
311 | lldb::pid_t pid, NativeProcessProtocol::NativeDelegate &native_delegate) { | |||
312 | Log *log = GetLog(POSIXLog::Process); | |||
313 | LLDB_LOG(log, "pid = {0:x}", pid)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid = {0:x}", pid); } while (0); | |||
314 | ||||
315 | auto tids_or = NativeProcessLinux::Attach(pid); | |||
316 | if (!tids_or) | |||
317 | return tids_or.takeError(); | |||
318 | ArrayRef<::pid_t> tids = *tids_or; | |||
319 | llvm::Expected<ArchSpec> arch_or = | |||
320 | NativeRegisterContextLinux::DetermineArchitecture(tids[0]); | |||
321 | if (!arch_or) | |||
322 | return arch_or.takeError(); | |||
323 | ||||
324 | return std::unique_ptr<NativeProcessLinux>( | |||
325 | new NativeProcessLinux(pid, -1, native_delegate, *arch_or, *this, tids)); | |||
326 | } | |||
327 | ||||
328 | NativeProcessLinux::Extension | |||
329 | NativeProcessLinux::Manager::GetSupportedExtensions() const { | |||
330 | NativeProcessLinux::Extension supported = | |||
331 | Extension::multiprocess | Extension::fork | Extension::vfork | | |||
332 | Extension::pass_signals | Extension::auxv | Extension::libraries_svr4 | | |||
333 | Extension::siginfo_read; | |||
334 | ||||
335 | #ifdef __aarch64__ | |||
336 | // At this point we do not have a process so read auxv directly. | |||
337 | if ((getauxval(AT_HWCAP2) & HWCAP2_MTE(1 << 18))) | |||
338 | supported |= Extension::memory_tagging; | |||
339 | #endif | |||
340 | ||||
341 | return supported; | |||
342 | } | |||
343 | ||||
344 | static std::optional<std::pair<lldb::pid_t, WaitStatus>> WaitPid() { | |||
345 | Log *log = GetLog(POSIXLog::Process); | |||
346 | ||||
347 | int status; | |||
348 | ::pid_t wait_pid = llvm::sys::RetryAfterSignal( | |||
349 | -1, ::waitpid, -1, &status, __WALL0x40000000 | __WNOTHREAD0x20000000 | WNOHANG1); | |||
350 | ||||
351 | if (wait_pid == 0) | |||
352 | return std::nullopt; | |||
353 | ||||
354 | if (wait_pid == -1) { | |||
355 | Status error(errno(*__errno_location ()), eErrorTypePOSIX); | |||
356 | LLDB_LOG(log, "waitpid(-1, &status, _) failed: {1}", error)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "waitpid(-1, &status, _) failed: {1}", error) ; } while (0); | |||
357 | return std::nullopt; | |||
358 | } | |||
359 | ||||
360 | WaitStatus wait_status = WaitStatus::Decode(status); | |||
361 | ||||
362 | LLDB_LOG(log, "waitpid(-1, &status, _) = {0}, status = {1}", wait_pid,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "waitpid(-1, &status, _) = {0}, status = {1}" , wait_pid, wait_status); } while (0) | |||
363 | wait_status)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "waitpid(-1, &status, _) = {0}, status = {1}" , wait_pid, wait_status); } while (0); | |||
364 | return std::make_pair(wait_pid, wait_status); | |||
365 | } | |||
366 | ||||
367 | void NativeProcessLinux::Manager::SigchldHandler() { | |||
368 | Log *log = GetLog(POSIXLog::Process); | |||
369 | while (true) { | |||
370 | auto wait_result = WaitPid(); | |||
371 | if (!wait_result) | |||
372 | return; | |||
373 | lldb::pid_t pid = wait_result->first; | |||
374 | WaitStatus status = wait_result->second; | |||
375 | ||||
376 | // Ask each process whether it wants to handle the event. Each event should | |||
377 | // be handled by exactly one process, but thread creation events require | |||
378 | // special handling. | |||
379 | // Thread creation consists of two events (one on the parent and one on the | |||
380 | // child thread) and they can arrive in any order nondeterministically. The | |||
381 | // parent event carries the information about the child thread, but not | |||
382 | // vice-versa. This means that if the child event arrives first, it may not | |||
383 | // be handled by any process (because it doesn't know the thread belongs to | |||
384 | // it). | |||
385 | bool handled = llvm::any_of(m_processes, [&](NativeProcessLinux *process) { | |||
386 | return process->TryHandleWaitStatus(pid, status); | |||
387 | }); | |||
388 | if (!handled) { | |||
389 | if (status.type == WaitStatus::Stop && status.status == SIGSTOP19) { | |||
390 | // Store the thread creation event for later collection. | |||
391 | m_unowned_threads.insert(pid); | |||
392 | } else { | |||
393 | LLDB_LOG(log, "Ignoring waitpid event {0} for pid {1}", status, pid)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Ignoring waitpid event {0} for pid {1}", status, pid); } while (0); | |||
394 | } | |||
395 | } | |||
396 | } | |||
397 | } | |||
398 | ||||
399 | void NativeProcessLinux::Manager::CollectThread(::pid_t tid) { | |||
400 | Log *log = GetLog(POSIXLog::Process); | |||
401 | ||||
402 | if (m_unowned_threads.erase(tid)) | |||
403 | return; // We've encountered this thread already. | |||
404 | ||||
405 | // The TID is not tracked yet, let's wait for it to appear. | |||
406 | int status = -1; | |||
407 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received clone event for tid {0}. tid not tracked yet, " "waiting for it to appear...", tid); } while (0) | |||
408 | "received clone event for tid {0}. tid not tracked yet, "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received clone event for tid {0}. tid not tracked yet, " "waiting for it to appear...", tid); } while (0) | |||
409 | "waiting for it to appear...",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received clone event for tid {0}. tid not tracked yet, " "waiting for it to appear...", tid); } while (0) | |||
410 | tid)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received clone event for tid {0}. tid not tracked yet, " "waiting for it to appear...", tid); } while (0); | |||
411 | ::pid_t wait_pid = | |||
412 | llvm::sys::RetryAfterSignal(-1, ::waitpid, tid, &status, __WALL0x40000000); | |||
413 | ||||
414 | // It's theoretically possible to get other events if the entire process was | |||
415 | // SIGKILLed before we got a chance to check this. In that case, we'll just | |||
416 | // clean everything up when we get the process exit event. | |||
417 | ||||
418 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "waitpid({0}, &status, __WALL) => {1} (errno: {2}, status = {3})" , tid, wait_pid, (*__errno_location ()), WaitStatus::Decode(status )); } while (0) | |||
419 | "waitpid({0}, &status, __WALL) => {1} (errno: {2}, status = {3})",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "waitpid({0}, &status, __WALL) => {1} (errno: {2}, status = {3})" , tid, wait_pid, (*__errno_location ()), WaitStatus::Decode(status )); } while (0) | |||
420 | tid, wait_pid, errno, WaitStatus::Decode(status))do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "waitpid({0}, &status, __WALL) => {1} (errno: {2}, status = {3})" , tid, wait_pid, (*__errno_location ()), WaitStatus::Decode(status )); } while (0); | |||
421 | } | |||
422 | ||||
423 | // Public Instance Methods | |||
424 | ||||
425 | NativeProcessLinux::NativeProcessLinux(::pid_t pid, int terminal_fd, | |||
426 | NativeDelegate &delegate, | |||
427 | const ArchSpec &arch, Manager &manager, | |||
428 | llvm::ArrayRef<::pid_t> tids) | |||
429 | : NativeProcessELF(pid, terminal_fd, delegate), m_manager(manager), | |||
430 | m_arch(arch), m_intel_pt_collector(*this) { | |||
431 | manager.AddProcess(*this); | |||
432 | if (m_terminal_fd != -1) { | |||
433 | Status status = EnsureFDFlags(m_terminal_fd, O_NONBLOCK04000); | |||
434 | assert(status.Success())(static_cast <bool> (status.Success()) ? void (0) : __assert_fail ("status.Success()", "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , 434, __extension__ __PRETTY_FUNCTION__)); | |||
435 | } | |||
436 | ||||
437 | for (const auto &tid : tids) { | |||
438 | NativeThreadLinux &thread = AddThread(tid, /*resume*/ false); | |||
439 | ThreadWasCreated(thread); | |||
440 | } | |||
441 | ||||
442 | // Let our process instance know the thread has stopped. | |||
443 | SetCurrentThreadID(tids[0]); | |||
444 | SetState(StateType::eStateStopped, false); | |||
445 | } | |||
446 | ||||
447 | llvm::Expected<std::vector<::pid_t>> NativeProcessLinux::Attach(::pid_t pid) { | |||
448 | Log *log = GetLog(POSIXLog::Process); | |||
449 | ||||
450 | Status status; | |||
451 | // Use a map to keep track of the threads which we have attached/need to | |||
452 | // attach. | |||
453 | Host::TidMap tids_to_attach; | |||
454 | while (Host::FindProcessThreads(pid, tids_to_attach)) { | |||
455 | for (Host::TidMap::iterator it = tids_to_attach.begin(); | |||
456 | it != tids_to_attach.end();) { | |||
457 | if (it->second == false) { | |||
458 | lldb::tid_t tid = it->first; | |||
459 | ||||
460 | // Attach to the requested process. | |||
461 | // An attach will cause the thread to stop with a SIGSTOP. | |||
462 | if ((status = PtraceWrapper(PTRACE_ATTACH, tid)).Fail()) { | |||
463 | // No such thread. The thread may have exited. More error handling | |||
464 | // may be needed. | |||
465 | if (status.GetError() == ESRCH3) { | |||
466 | it = tids_to_attach.erase(it); | |||
467 | continue; | |||
468 | } | |||
469 | if (status.GetError() == EPERM1) { | |||
470 | // Depending on the value of ptrace_scope, we can return a different | |||
471 | // error that suggests how to fix it. | |||
472 | return AddPtraceScopeNote(status.ToError()); | |||
473 | } | |||
474 | return status.ToError(); | |||
475 | } | |||
476 | ||||
477 | int wpid = | |||
478 | llvm::sys::RetryAfterSignal(-1, ::waitpid, tid, nullptr, __WALL0x40000000); | |||
479 | // Need to use __WALL otherwise we receive an error with errno=ECHLD At | |||
480 | // this point we should have a thread stopped if waitpid succeeds. | |||
481 | if (wpid < 0) { | |||
482 | // No such thread. The thread may have exited. More error handling | |||
483 | // may be needed. | |||
484 | if (errno(*__errno_location ()) == ESRCH3) { | |||
485 | it = tids_to_attach.erase(it); | |||
486 | continue; | |||
487 | } | |||
488 | return llvm::errorCodeToError( | |||
489 | std::error_code(errno(*__errno_location ()), std::generic_category())); | |||
490 | } | |||
491 | ||||
492 | if ((status = SetDefaultPtraceOpts(tid)).Fail()) | |||
493 | return status.ToError(); | |||
494 | ||||
495 | LLDB_LOG(log, "adding tid = {0}", tid)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "adding tid = {0}", tid); } while (0); | |||
496 | it->second = true; | |||
497 | } | |||
498 | ||||
499 | // move the loop forward | |||
500 | ++it; | |||
501 | } | |||
502 | } | |||
503 | ||||
504 | size_t tid_count = tids_to_attach.size(); | |||
505 | if (tid_count == 0) | |||
506 | return llvm::make_error<StringError>("No such process", | |||
507 | llvm::inconvertibleErrorCode()); | |||
508 | ||||
509 | std::vector<::pid_t> tids; | |||
510 | tids.reserve(tid_count); | |||
511 | for (const auto &p : tids_to_attach) | |||
512 | tids.push_back(p.first); | |||
513 | return std::move(tids); | |||
514 | } | |||
515 | ||||
516 | Status NativeProcessLinux::SetDefaultPtraceOpts(lldb::pid_t pid) { | |||
517 | long ptrace_opts = 0; | |||
518 | ||||
519 | // Have the child raise an event on exit. This is used to keep the child in | |||
520 | // limbo until it is destroyed. | |||
521 | ptrace_opts |= PTRACE_O_TRACEEXIT; | |||
522 | ||||
523 | // Have the tracer trace threads which spawn in the inferior process. | |||
524 | ptrace_opts |= PTRACE_O_TRACECLONE; | |||
525 | ||||
526 | // Have the tracer notify us before execve returns (needed to disable legacy | |||
527 | // SIGTRAP generation) | |||
528 | ptrace_opts |= PTRACE_O_TRACEEXEC; | |||
529 | ||||
530 | // Have the tracer trace forked children. | |||
531 | ptrace_opts |= PTRACE_O_TRACEFORK; | |||
532 | ||||
533 | // Have the tracer trace vforks. | |||
534 | ptrace_opts |= PTRACE_O_TRACEVFORK; | |||
535 | ||||
536 | // Have the tracer trace vfork-done in order to restore breakpoints after | |||
537 | // the child finishes sharing memory. | |||
538 | ptrace_opts |= PTRACE_O_TRACEVFORKDONE; | |||
539 | ||||
540 | return PtraceWrapper(PTRACE_SETOPTIONS, pid, nullptr, (void *)ptrace_opts); | |||
541 | } | |||
542 | ||||
543 | bool NativeProcessLinux::TryHandleWaitStatus(lldb::pid_t pid, | |||
544 | WaitStatus status) { | |||
545 | if (pid == GetID() && | |||
546 | (status.type == WaitStatus::Exit || status.type == WaitStatus::Signal)) { | |||
547 | // The process exited. We're done monitoring. Report to delegate. | |||
548 | SetExitStatus(status, true); | |||
549 | return true; | |||
550 | } | |||
551 | if (NativeThreadLinux *thread = GetThreadByID(pid)) { | |||
552 | MonitorCallback(*thread, status); | |||
553 | return true; | |||
554 | } | |||
555 | return false; | |||
556 | } | |||
557 | ||||
558 | void NativeProcessLinux::MonitorCallback(NativeThreadLinux &thread, | |||
559 | WaitStatus status) { | |||
560 | Log *log = GetLog(LLDBLog::Process); | |||
561 | ||||
562 | // Certain activities differ based on whether the pid is the tid of the main | |||
563 | // thread. | |||
564 | const bool is_main_thread = (thread.GetID() == GetID()); | |||
565 | ||||
566 | // Handle when the thread exits. | |||
567 | if (status.type == WaitStatus::Exit || status.type == WaitStatus::Signal) { | |||
568 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "got exit status({0}) , tid = {1} ({2} main thread), process " "state = {3}", status, thread.GetID(), is_main_thread ? "is" : "is not", GetState()); } while (0) | |||
569 | "got exit status({0}) , tid = {1} ({2} main thread), process "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "got exit status({0}) , tid = {1} ({2} main thread), process " "state = {3}", status, thread.GetID(), is_main_thread ? "is" : "is not", GetState()); } while (0) | |||
570 | "state = {3}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "got exit status({0}) , tid = {1} ({2} main thread), process " "state = {3}", status, thread.GetID(), is_main_thread ? "is" : "is not", GetState()); } while (0) | |||
571 | status, thread.GetID(), is_main_thread ? "is" : "is not",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "got exit status({0}) , tid = {1} ({2} main thread), process " "state = {3}", status, thread.GetID(), is_main_thread ? "is" : "is not", GetState()); } while (0) | |||
572 | GetState())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "got exit status({0}) , tid = {1} ({2} main thread), process " "state = {3}", status, thread.GetID(), is_main_thread ? "is" : "is not", GetState()); } while (0); | |||
573 | ||||
574 | // This is a thread that exited. Ensure we're not tracking it anymore. | |||
575 | StopTrackingThread(thread); | |||
576 | ||||
577 | assert(!is_main_thread && "Main thread exits handled elsewhere")(static_cast <bool> (!is_main_thread && "Main thread exits handled elsewhere" ) ? void (0) : __assert_fail ("!is_main_thread && \"Main thread exits handled elsewhere\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 577, __extension__ __PRETTY_FUNCTION__)); | |||
578 | return; | |||
579 | } | |||
580 | ||||
581 | siginfo_t info; | |||
582 | const auto info_err = GetSignalInfo(thread.GetID(), &info); | |||
583 | ||||
584 | // Get details on the signal raised. | |||
585 | if (info_err.Success()) { | |||
586 | // We have retrieved the signal info. Dispatch appropriately. | |||
587 | if (info.si_signo == SIGTRAP5) | |||
588 | MonitorSIGTRAP(info, thread); | |||
589 | else | |||
590 | MonitorSignal(info, thread); | |||
591 | } else { | |||
592 | if (info_err.GetError() == EINVAL22) { | |||
593 | // This is a group stop reception for this tid. We can reach here if we | |||
594 | // reinject SIGSTOP, SIGSTP, SIGTTIN or SIGTTOU into the tracee, | |||
595 | // triggering the group-stop mechanism. Normally receiving these would | |||
596 | // stop the process, pending a SIGCONT. Simulating this state in a | |||
597 | // debugger is hard and is generally not needed (one use case is | |||
598 | // debugging background task being managed by a shell). For general use, | |||
599 | // it is sufficient to stop the process in a signal-delivery stop which | |||
600 | // happens before the group stop. This done by MonitorSignal and works | |||
601 | // correctly for all signals. | |||
602 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received a group stop for pid {0} tid {1}. Transparent " "handling of group stops not supported, resuming the " "thread." , GetID(), thread.GetID()); } while (0) | |||
603 | "received a group stop for pid {0} tid {1}. Transparent "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received a group stop for pid {0} tid {1}. Transparent " "handling of group stops not supported, resuming the " "thread." , GetID(), thread.GetID()); } while (0) | |||
604 | "handling of group stops not supported, resuming the "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received a group stop for pid {0} tid {1}. Transparent " "handling of group stops not supported, resuming the " "thread." , GetID(), thread.GetID()); } while (0) | |||
605 | "thread.",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received a group stop for pid {0} tid {1}. Transparent " "handling of group stops not supported, resuming the " "thread." , GetID(), thread.GetID()); } while (0) | |||
606 | GetID(), thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received a group stop for pid {0} tid {1}. Transparent " "handling of group stops not supported, resuming the " "thread." , GetID(), thread.GetID()); } while (0); | |||
607 | ResumeThread(thread, thread.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647)); | |||
608 | } else { | |||
609 | // ptrace(GETSIGINFO) failed (but not due to group-stop). | |||
610 | ||||
611 | // A return value of ESRCH means the thread/process has died in the mean | |||
612 | // time. This can (e.g.) happen when another thread does an exit_group(2) | |||
613 | // or the entire process get SIGKILLed. | |||
614 | // We can't do anything with this thread anymore, but we keep it around | |||
615 | // until we get the WIFEXITED event. | |||
616 | ||||
617 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "GetSignalInfo({0}) failed: {1}, status = {2}, main_thread = " "{3}. Expecting WIFEXITED soon.", thread.GetID(), info_err, status , is_main_thread); } while (0) | |||
618 | "GetSignalInfo({0}) failed: {1}, status = {2}, main_thread = "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "GetSignalInfo({0}) failed: {1}, status = {2}, main_thread = " "{3}. Expecting WIFEXITED soon.", thread.GetID(), info_err, status , is_main_thread); } while (0) | |||
619 | "{3}. Expecting WIFEXITED soon.",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "GetSignalInfo({0}) failed: {1}, status = {2}, main_thread = " "{3}. Expecting WIFEXITED soon.", thread.GetID(), info_err, status , is_main_thread); } while (0) | |||
620 | thread.GetID(), info_err, status, is_main_thread)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "GetSignalInfo({0}) failed: {1}, status = {2}, main_thread = " "{3}. Expecting WIFEXITED soon.", thread.GetID(), info_err, status , is_main_thread); } while (0); | |||
621 | } | |||
622 | } | |||
623 | } | |||
624 | ||||
625 | void NativeProcessLinux::MonitorSIGTRAP(const siginfo_t &info, | |||
626 | NativeThreadLinux &thread) { | |||
627 | Log *log = GetLog(POSIXLog::Process); | |||
628 | const bool is_main_thread = (thread.GetID() == GetID()); | |||
629 | ||||
630 | assert(info.si_signo == SIGTRAP && "Unexpected child signal!")(static_cast <bool> (info.si_signo == 5 && "Unexpected child signal!" ) ? void (0) : __assert_fail ("info.si_signo == SIGTRAP && \"Unexpected child signal!\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 630, __extension__ __PRETTY_FUNCTION__)); | |||
631 | ||||
632 | switch (info.si_code) { | |||
633 | case (SIGTRAP5 | (PTRACE_EVENT_FORK << 8)): | |||
634 | case (SIGTRAP5 | (PTRACE_EVENT_VFORK << 8)): | |||
635 | case (SIGTRAP5 | (PTRACE_EVENT_CLONE << 8)): { | |||
636 | // This can either mean a new thread or a new process spawned via | |||
637 | // clone(2) without SIGCHLD or CLONE_VFORK flag. Note that clone(2) | |||
638 | // can also cause PTRACE_EVENT_FORK and PTRACE_EVENT_VFORK if one | |||
639 | // of these flags are passed. | |||
640 | ||||
641 | unsigned long event_message = 0; | |||
642 | if (GetEventMessage(thread.GetID(), &event_message).Fail()) { | |||
643 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} received clone() event but GetEventMessage failed " "so we don't know the new pid/tid", thread.GetID()); } while (0) | |||
644 | "pid {0} received clone() event but GetEventMessage failed "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} received clone() event but GetEventMessage failed " "so we don't know the new pid/tid", thread.GetID()); } while (0) | |||
645 | "so we don't know the new pid/tid",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} received clone() event but GetEventMessage failed " "so we don't know the new pid/tid", thread.GetID()); } while (0) | |||
646 | thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} received clone() event but GetEventMessage failed " "so we don't know the new pid/tid", thread.GetID()); } while (0); | |||
647 | ResumeThread(thread, thread.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647)); | |||
648 | } else { | |||
649 | MonitorClone(thread, event_message, info.si_code >> 8); | |||
650 | } | |||
651 | ||||
652 | break; | |||
653 | } | |||
654 | ||||
655 | case (SIGTRAP5 | (PTRACE_EVENT_EXEC << 8)): { | |||
656 | LLDB_LOG(log, "received exec event, code = {0}", info.si_code ^ SIGTRAP)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received exec event, code = {0}", info.si_code ^ 5); } while (0); | |||
657 | ||||
658 | // Exec clears any pending notifications. | |||
659 | m_pending_notification_tid = LLDB_INVALID_THREAD_ID0; | |||
660 | ||||
661 | // Remove all but the main thread here. Linux fork creates a new process | |||
662 | // which only copies the main thread. | |||
663 | LLDB_LOG(log, "exec received, stop tracking all but main thread")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "exec received, stop tracking all but main thread" ); } while (0); | |||
664 | ||||
665 | llvm::erase_if(m_threads, [&](std::unique_ptr<NativeThreadProtocol> &t) { | |||
666 | return t->GetID() != GetID(); | |||
667 | }); | |||
668 | assert(m_threads.size() == 1)(static_cast <bool> (m_threads.size() == 1) ? void (0) : __assert_fail ("m_threads.size() == 1", "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , 668, __extension__ __PRETTY_FUNCTION__)); | |||
669 | auto *main_thread = static_cast<NativeThreadLinux *>(m_threads[0].get()); | |||
670 | ||||
671 | SetCurrentThreadID(main_thread->GetID()); | |||
672 | main_thread->SetStoppedByExec(); | |||
673 | ||||
674 | // Tell coordinator about about the "new" (since exec) stopped main thread. | |||
675 | ThreadWasCreated(*main_thread); | |||
676 | ||||
677 | // Let our delegate know we have just exec'd. | |||
678 | NotifyDidExec(); | |||
679 | ||||
680 | // Let the process know we're stopped. | |||
681 | StopRunningThreads(main_thread->GetID()); | |||
682 | ||||
683 | break; | |||
684 | } | |||
685 | ||||
686 | case (SIGTRAP5 | (PTRACE_EVENT_EXIT << 8)): { | |||
687 | // The inferior process or one of its threads is about to exit. We don't | |||
688 | // want to do anything with the thread so we just resume it. In case we | |||
689 | // want to implement "break on thread exit" functionality, we would need to | |||
690 | // stop here. | |||
691 | ||||
692 | unsigned long data = 0; | |||
693 | if (GetEventMessage(thread.GetID(), &data).Fail()) | |||
694 | data = -1; | |||
695 | ||||
696 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received PTRACE_EVENT_EXIT, data = {0:x}, WIFEXITED={1}, " "WIFSIGNALED={2}, pid = {3}, main_thread = {4}", data, (((data ) & 0x7f) == 0), (((signed char) (((data) & 0x7f) + 1 ) >> 1) > 0), thread.GetID(), is_main_thread); } while (0) | |||
697 | "received PTRACE_EVENT_EXIT, data = {0:x}, WIFEXITED={1}, "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received PTRACE_EVENT_EXIT, data = {0:x}, WIFEXITED={1}, " "WIFSIGNALED={2}, pid = {3}, main_thread = {4}", data, (((data ) & 0x7f) == 0), (((signed char) (((data) & 0x7f) + 1 ) >> 1) > 0), thread.GetID(), is_main_thread); } while (0) | |||
698 | "WIFSIGNALED={2}, pid = {3}, main_thread = {4}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received PTRACE_EVENT_EXIT, data = {0:x}, WIFEXITED={1}, " "WIFSIGNALED={2}, pid = {3}, main_thread = {4}", data, (((data ) & 0x7f) == 0), (((signed char) (((data) & 0x7f) + 1 ) >> 1) > 0), thread.GetID(), is_main_thread); } while (0) | |||
699 | data, WIFEXITED(data), WIFSIGNALED(data), thread.GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received PTRACE_EVENT_EXIT, data = {0:x}, WIFEXITED={1}, " "WIFSIGNALED={2}, pid = {3}, main_thread = {4}", data, (((data ) & 0x7f) == 0), (((signed char) (((data) & 0x7f) + 1 ) >> 1) > 0), thread.GetID(), is_main_thread); } while (0) | |||
700 | is_main_thread)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received PTRACE_EVENT_EXIT, data = {0:x}, WIFEXITED={1}, " "WIFSIGNALED={2}, pid = {3}, main_thread = {4}", data, (((data ) & 0x7f) == 0), (((signed char) (((data) & 0x7f) + 1 ) >> 1) > 0), thread.GetID(), is_main_thread); } while (0); | |||
701 | ||||
702 | ||||
703 | StateType state = thread.GetState(); | |||
704 | if (!StateIsRunningState(state)) { | |||
705 | // Due to a kernel bug, we may sometimes get this stop after the inferior | |||
706 | // gets a SIGKILL. This confuses our state tracking logic in | |||
707 | // ResumeThread(), since normally, we should not be receiving any ptrace | |||
708 | // events while the inferior is stopped. This makes sure that the | |||
709 | // inferior is resumed and exits normally. | |||
710 | state = eStateRunning; | |||
711 | } | |||
712 | ResumeThread(thread, state, LLDB_INVALID_SIGNAL_NUMBER(2147483647)); | |||
713 | ||||
714 | if (is_main_thread) { | |||
715 | // Main thread report the read (WIFEXITED) event only after all threads in | |||
716 | // the process exit, so we need to stop tracking it here instead of in | |||
717 | // MonitorCallback | |||
718 | StopTrackingThread(thread); | |||
719 | } | |||
720 | ||||
721 | break; | |||
722 | } | |||
723 | ||||
724 | case (SIGTRAP5 | (PTRACE_EVENT_VFORK_DONE << 8)): { | |||
725 | if (bool(m_enabled_extensions & Extension::vfork)) { | |||
726 | thread.SetStoppedByVForkDone(); | |||
727 | StopRunningThreads(thread.GetID()); | |||
728 | } | |||
729 | else | |||
730 | ResumeThread(thread, thread.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647)); | |||
731 | break; | |||
732 | } | |||
733 | ||||
734 | case 0: | |||
735 | case TRAP_TRACETRAP_TRACE: // We receive this on single stepping. | |||
736 | case TRAP_HWBKPTTRAP_HWBKPT: // We receive this on watchpoint hit | |||
737 | { | |||
738 | // If a watchpoint was hit, report it | |||
739 | uint32_t wp_index; | |||
740 | Status error = thread.GetRegisterContext().GetWatchpointHitIndex( | |||
741 | wp_index, (uintptr_t)info.si_addr_sifields._sigfault.si_addr); | |||
742 | if (error.Fail()) | |||
743 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for watchpoint hits, pid = " "{0}, error = {1}", thread.GetID(), error); } while (0) | |||
744 | "received error while checking for watchpoint hits, pid = "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for watchpoint hits, pid = " "{0}, error = {1}", thread.GetID(), error); } while (0) | |||
745 | "{0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for watchpoint hits, pid = " "{0}, error = {1}", thread.GetID(), error); } while (0) | |||
746 | thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for watchpoint hits, pid = " "{0}, error = {1}", thread.GetID(), error); } while (0); | |||
747 | if (wp_index != LLDB_INVALID_INDEX32(4294967295U)) { | |||
748 | MonitorWatchpoint(thread, wp_index); | |||
749 | break; | |||
750 | } | |||
751 | ||||
752 | // If a breakpoint was hit, report it | |||
753 | uint32_t bp_index; | |||
754 | error = thread.GetRegisterContext().GetHardwareBreakHitIndex( | |||
755 | bp_index, (uintptr_t)info.si_addr_sifields._sigfault.si_addr); | |||
756 | if (error.Fail()) | |||
757 | LLDB_LOG(log, "received error while checking for hardware "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for hardware " "breakpoint hits, pid = {0}, error = {1}" , thread.GetID(), error); } while (0) | |||
758 | "breakpoint hits, pid = {0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for hardware " "breakpoint hits, pid = {0}, error = {1}" , thread.GetID(), error); } while (0) | |||
759 | thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for hardware " "breakpoint hits, pid = {0}, error = {1}" , thread.GetID(), error); } while (0); | |||
760 | if (bp_index != LLDB_INVALID_INDEX32(4294967295U)) { | |||
761 | MonitorBreakpoint(thread); | |||
762 | break; | |||
763 | } | |||
764 | ||||
765 | // Otherwise, report step over | |||
766 | MonitorTrace(thread); | |||
767 | break; | |||
768 | } | |||
769 | ||||
770 | case SI_KERNELSI_KERNEL: | |||
771 | #if defined __mips__ | |||
772 | // For mips there is no special signal for watchpoint So we check for | |||
773 | // watchpoint in kernel trap | |||
774 | { | |||
775 | // If a watchpoint was hit, report it | |||
776 | uint32_t wp_index; | |||
777 | Status error = thread.GetRegisterContext().GetWatchpointHitIndex( | |||
778 | wp_index, LLDB_INVALID_ADDRESS(18446744073709551615UL)); | |||
779 | if (error.Fail()) | |||
780 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for watchpoint hits, pid = " "{0}, error = {1}", thread.GetID(), error); } while (0) | |||
781 | "received error while checking for watchpoint hits, pid = "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for watchpoint hits, pid = " "{0}, error = {1}", thread.GetID(), error); } while (0) | |||
782 | "{0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for watchpoint hits, pid = " "{0}, error = {1}", thread.GetID(), error); } while (0) | |||
783 | thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received error while checking for watchpoint hits, pid = " "{0}, error = {1}", thread.GetID(), error); } while (0); | |||
784 | if (wp_index != LLDB_INVALID_INDEX32(4294967295U)) { | |||
785 | MonitorWatchpoint(thread, wp_index); | |||
786 | break; | |||
787 | } | |||
788 | } | |||
789 | // NO BREAK | |||
790 | #endif | |||
791 | case TRAP_BRKPTTRAP_BRKPT: | |||
792 | MonitorBreakpoint(thread); | |||
793 | break; | |||
794 | ||||
795 | case SIGTRAP5: | |||
796 | case (SIGTRAP5 | 0x80): | |||
797 | LLDB_LOG(do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}, resuming" , info.si_code, GetID(), thread.GetID()); } while (0) | |||
798 | log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}, resuming" , info.si_code, GetID(), thread.GetID()); } while (0) | |||
799 | "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}, resuming",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}, resuming" , info.si_code, GetID(), thread.GetID()); } while (0) | |||
800 | info.si_code, GetID(), thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}, resuming" , info.si_code, GetID(), thread.GetID()); } while (0); | |||
801 | ||||
802 | // Ignore these signals until we know more about them. | |||
803 | ResumeThread(thread, thread.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647)); | |||
804 | break; | |||
805 | ||||
806 | default: | |||
807 | LLDB_LOG(log, "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}" , info.si_code, GetID(), thread.GetID()); } while (0) | |||
808 | info.si_code, GetID(), thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}" , info.si_code, GetID(), thread.GetID()); } while (0); | |||
809 | MonitorSignal(info, thread); | |||
810 | break; | |||
811 | } | |||
812 | } | |||
813 | ||||
814 | void NativeProcessLinux::MonitorTrace(NativeThreadLinux &thread) { | |||
815 | Log *log = GetLog(POSIXLog::Process); | |||
816 | LLDB_LOG(log, "received trace event, pid = {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received trace event, pid = {0}", thread.GetID() ); } while (0); | |||
817 | ||||
818 | // This thread is currently stopped. | |||
819 | thread.SetStoppedByTrace(); | |||
820 | ||||
821 | StopRunningThreads(thread.GetID()); | |||
822 | } | |||
823 | ||||
824 | void NativeProcessLinux::MonitorBreakpoint(NativeThreadLinux &thread) { | |||
825 | Log *log = GetLog(LLDBLog::Process | LLDBLog::Breakpoints); | |||
826 | LLDB_LOG(log, "received breakpoint event, pid = {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received breakpoint event, pid = {0}", thread.GetID ()); } while (0); | |||
827 | ||||
828 | // Mark the thread as stopped at breakpoint. | |||
829 | thread.SetStoppedByBreakpoint(); | |||
830 | FixupBreakpointPCAsNeeded(thread); | |||
831 | ||||
832 | if (m_threads_stepping_with_breakpoint.find(thread.GetID()) != | |||
833 | m_threads_stepping_with_breakpoint.end()) | |||
834 | thread.SetStoppedByTrace(); | |||
835 | ||||
836 | StopRunningThreads(thread.GetID()); | |||
837 | } | |||
838 | ||||
839 | void NativeProcessLinux::MonitorWatchpoint(NativeThreadLinux &thread, | |||
840 | uint32_t wp_index) { | |||
841 | Log *log = GetLog(LLDBLog::Process | LLDBLog::Watchpoints); | |||
842 | LLDB_LOG(log, "received watchpoint event, pid = {0}, wp_index = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received watchpoint event, pid = {0}, wp_index = {1}" , thread.GetID(), wp_index); } while (0) | |||
843 | thread.GetID(), wp_index)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received watchpoint event, pid = {0}, wp_index = {1}" , thread.GetID(), wp_index); } while (0); | |||
844 | ||||
845 | // Mark the thread as stopped at watchpoint. The address is at | |||
846 | // (lldb::addr_t)info->si_addr if we need it. | |||
847 | thread.SetStoppedByWatchpoint(wp_index); | |||
848 | ||||
849 | // We need to tell all other running threads before we notify the delegate | |||
850 | // about this stop. | |||
851 | StopRunningThreads(thread.GetID()); | |||
852 | } | |||
853 | ||||
854 | void NativeProcessLinux::MonitorSignal(const siginfo_t &info, | |||
855 | NativeThreadLinux &thread) { | |||
856 | const int signo = info.si_signo; | |||
857 | const bool is_from_llgs = info.si_pid_sifields._kill.si_pid == getpid(); | |||
858 | ||||
859 | Log *log = GetLog(POSIXLog::Process); | |||
860 | ||||
861 | // POSIX says that process behaviour is undefined after it ignores a SIGFPE, | |||
862 | // SIGILL, SIGSEGV, or SIGBUS *unless* that signal was generated by a kill(2) | |||
863 | // or raise(3). Similarly for tgkill(2) on Linux. | |||
864 | // | |||
865 | // IOW, user generated signals never generate what we consider to be a | |||
866 | // "crash". | |||
867 | // | |||
868 | // Similarly, ACK signals generated by this monitor. | |||
869 | ||||
870 | // Handle the signal. | |||
871 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received signal {0} ({1}) with code {2}, (siginfo pid = {3}, " "waitpid pid = {4})", Host::GetSignalAsCString(signo), signo , info.si_code, thread.GetID()); } while (0) | |||
872 | "received signal {0} ({1}) with code {2}, (siginfo pid = {3}, "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received signal {0} ({1}) with code {2}, (siginfo pid = {3}, " "waitpid pid = {4})", Host::GetSignalAsCString(signo), signo , info.si_code, thread.GetID()); } while (0) | |||
873 | "waitpid pid = {4})",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received signal {0} ({1}) with code {2}, (siginfo pid = {3}, " "waitpid pid = {4})", Host::GetSignalAsCString(signo), signo , info.si_code, thread.GetID()); } while (0) | |||
874 | Host::GetSignalAsCString(signo), signo, info.si_code,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received signal {0} ({1}) with code {2}, (siginfo pid = {3}, " "waitpid pid = {4})", Host::GetSignalAsCString(signo), signo , info.si_code, thread.GetID()); } while (0) | |||
875 | thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received signal {0} ({1}) with code {2}, (siginfo pid = {3}, " "waitpid pid = {4})", Host::GetSignalAsCString(signo), signo , info.si_code, thread.GetID()); } while (0); | |||
876 | ||||
877 | // Check for thread stop notification. | |||
878 | if (is_from_llgs && (info.si_code == SI_TKILLSI_TKILL) && (signo == SIGSTOP19)) { | |||
879 | // This is a tgkill()-based stop. | |||
880 | LLDB_LOG(log, "pid {0} tid {1}, thread stopped", GetID(), thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} tid {1}, thread stopped", GetID(), thread .GetID()); } while (0); | |||
881 | ||||
882 | // Check that we're not already marked with a stop reason. Note this thread | |||
883 | // really shouldn't already be marked as stopped - if we were, that would | |||
884 | // imply that the kernel signaled us with the thread stopping which we | |||
885 | // handled and marked as stopped, and that, without an intervening resume, | |||
886 | // we received another stop. It is more likely that we are missing the | |||
887 | // marking of a run state somewhere if we find that the thread was marked | |||
888 | // as stopped. | |||
889 | const StateType thread_state = thread.GetState(); | |||
890 | if (!StateIsStoppedState(thread_state, false)) { | |||
891 | // An inferior thread has stopped because of a SIGSTOP we have sent it. | |||
892 | // Generally, these are not important stops and we don't want to report | |||
893 | // them as they are just used to stop other threads when one thread (the | |||
894 | // one with the *real* stop reason) hits a breakpoint (watchpoint, | |||
895 | // etc...). However, in the case of an asynchronous Interrupt(), this | |||
896 | // *is* the real stop reason, so we leave the signal intact if this is | |||
897 | // the thread that was chosen as the triggering thread. | |||
898 | if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0) { | |||
899 | if (m_pending_notification_tid == thread.GetID()) | |||
900 | thread.SetStoppedBySignal(SIGSTOP19, &info); | |||
901 | else | |||
902 | thread.SetStoppedWithNoReason(); | |||
903 | ||||
904 | SetCurrentThreadID(thread.GetID()); | |||
905 | SignalIfAllThreadsStopped(); | |||
906 | } else { | |||
907 | // We can end up here if stop was initiated by LLGS but by this time a | |||
908 | // thread stop has occurred - maybe initiated by another event. | |||
909 | Status error = ResumeThread(thread, thread.GetState(), 0); | |||
910 | if (error.Fail()) | |||
911 | LLDB_LOG(log, "failed to resume thread {0}: {1}", thread.GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "failed to resume thread {0}: {1}", thread.GetID( ), error); } while (0) | |||
912 | error)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "failed to resume thread {0}: {1}", thread.GetID( ), error); } while (0); | |||
913 | } | |||
914 | } else { | |||
915 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} tid {1}, thread was already marked as a stopped " "state (state={2}), leaving stop signal as is", GetID(), thread .GetID(), thread_state); } while (0) | |||
916 | "pid {0} tid {1}, thread was already marked as a stopped "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} tid {1}, thread was already marked as a stopped " "state (state={2}), leaving stop signal as is", GetID(), thread .GetID(), thread_state); } while (0) | |||
917 | "state (state={2}), leaving stop signal as is",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} tid {1}, thread was already marked as a stopped " "state (state={2}), leaving stop signal as is", GetID(), thread .GetID(), thread_state); } while (0) | |||
918 | GetID(), thread.GetID(), thread_state)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} tid {1}, thread was already marked as a stopped " "state (state={2}), leaving stop signal as is", GetID(), thread .GetID(), thread_state); } while (0); | |||
919 | SignalIfAllThreadsStopped(); | |||
920 | } | |||
921 | ||||
922 | // Done handling. | |||
923 | return; | |||
924 | } | |||
925 | ||||
926 | // Check if debugger should stop at this signal or just ignore it and resume | |||
927 | // the inferior. | |||
928 | if (m_signals_to_ignore.contains(signo)) { | |||
929 | ResumeThread(thread, thread.GetState(), signo); | |||
930 | return; | |||
931 | } | |||
932 | ||||
933 | // This thread is stopped. | |||
934 | LLDB_LOG(log, "received signal {0}", Host::GetSignalAsCString(signo))do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "received signal {0}", Host::GetSignalAsCString(signo )); } while (0); | |||
935 | thread.SetStoppedBySignal(signo, &info); | |||
936 | ||||
937 | // Send a stop to the debugger after we get all other threads to stop. | |||
938 | StopRunningThreads(thread.GetID()); | |||
939 | } | |||
940 | ||||
941 | bool NativeProcessLinux::MonitorClone(NativeThreadLinux &parent, | |||
942 | lldb::pid_t child_pid, int event) { | |||
943 | Log *log = GetLog(POSIXLog::Process); | |||
944 | LLDB_LOG(log, "parent_tid={0}, child_pid={1}, event={2}", parent.GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "parent_tid={0}, child_pid={1}, event={2}", parent .GetID(), child_pid, event); } while (0) | |||
945 | child_pid, event)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "parent_tid={0}, child_pid={1}, event={2}", parent .GetID(), child_pid, event); } while (0); | |||
946 | ||||
947 | m_manager.CollectThread(child_pid); | |||
948 | ||||
949 | switch (event) { | |||
950 | case PTRACE_EVENT_CLONE: { | |||
951 | // PTRACE_EVENT_CLONE can either mean a new thread or a new process. | |||
952 | // Try to grab the new process' PGID to figure out which one it is. | |||
953 | // If PGID is the same as the PID, then it's a new process. Otherwise, | |||
954 | // it's a thread. | |||
955 | auto tgid_ret = getPIDForTID(child_pid); | |||
956 | if (tgid_ret != child_pid) { | |||
957 | // A new thread should have PGID matching our process' PID. | |||
958 | assert(!tgid_ret || *tgid_ret == GetID())(static_cast <bool> (!tgid_ret || *tgid_ret == GetID()) ? void (0) : __assert_fail ("!tgid_ret || *tgid_ret == GetID()" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 958, __extension__ __PRETTY_FUNCTION__)); | |||
959 | ||||
960 | NativeThreadLinux &child_thread = AddThread(child_pid, /*resume*/ true); | |||
961 | ThreadWasCreated(child_thread); | |||
962 | ||||
963 | // Resume the parent. | |||
964 | ResumeThread(parent, parent.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647)); | |||
965 | break; | |||
966 | } | |||
967 | } | |||
968 | [[fallthrough]]; | |||
969 | case PTRACE_EVENT_FORK: | |||
970 | case PTRACE_EVENT_VFORK: { | |||
971 | bool is_vfork = event == PTRACE_EVENT_VFORK; | |||
972 | std::unique_ptr<NativeProcessLinux> child_process{new NativeProcessLinux( | |||
973 | static_cast<::pid_t>(child_pid), m_terminal_fd, m_delegate, m_arch, | |||
974 | m_manager, {static_cast<::pid_t>(child_pid)})}; | |||
975 | if (!is_vfork) | |||
976 | child_process->m_software_breakpoints = m_software_breakpoints; | |||
977 | ||||
978 | Extension expected_ext = is_vfork ? Extension::vfork : Extension::fork; | |||
979 | if (bool(m_enabled_extensions & expected_ext)) { | |||
980 | m_delegate.NewSubprocess(this, std::move(child_process)); | |||
981 | // NB: non-vfork clone() is reported as fork | |||
982 | parent.SetStoppedByFork(is_vfork, child_pid); | |||
983 | StopRunningThreads(parent.GetID()); | |||
984 | } else { | |||
985 | child_process->Detach(); | |||
986 | ResumeThread(parent, parent.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647)); | |||
987 | } | |||
988 | break; | |||
989 | } | |||
990 | default: | |||
991 | llvm_unreachable("unknown clone_info.event")::llvm::llvm_unreachable_internal("unknown clone_info.event", "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 991 ); | |||
992 | } | |||
993 | ||||
994 | return true; | |||
995 | } | |||
996 | ||||
997 | bool NativeProcessLinux::SupportHardwareSingleStepping() const { | |||
998 | if (m_arch.IsMIPS() || m_arch.GetMachine() == llvm::Triple::arm || | |||
999 | m_arch.GetTriple().isRISCV() || m_arch.GetTriple().isLoongArch()) | |||
1000 | return false; | |||
1001 | return true; | |||
1002 | } | |||
1003 | ||||
1004 | Status NativeProcessLinux::Resume(const ResumeActionList &resume_actions) { | |||
1005 | Log *log = GetLog(POSIXLog::Process); | |||
1006 | LLDB_LOG(log, "pid {0}", GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0}", GetID()); } while (0); | |||
1007 | ||||
1008 | NotifyTracersProcessWillResume(); | |||
1009 | ||||
1010 | bool software_single_step = !SupportHardwareSingleStepping(); | |||
1011 | ||||
1012 | if (software_single_step) { | |||
1013 | for (const auto &thread : m_threads) { | |||
1014 | assert(thread && "thread list should not contain NULL threads")(static_cast <bool> (thread && "thread list should not contain NULL threads" ) ? void (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1014, __extension__ __PRETTY_FUNCTION__)); | |||
1015 | ||||
1016 | const ResumeAction *const action = | |||
1017 | resume_actions.GetActionForThread(thread->GetID(), true); | |||
1018 | if (action == nullptr) | |||
1019 | continue; | |||
1020 | ||||
1021 | if (action->state == eStateStepping) { | |||
1022 | Status error = SetupSoftwareSingleStepping( | |||
1023 | static_cast<NativeThreadLinux &>(*thread)); | |||
1024 | if (error.Fail()) | |||
1025 | return error; | |||
1026 | } | |||
1027 | } | |||
1028 | } | |||
1029 | ||||
1030 | for (const auto &thread : m_threads) { | |||
1031 | assert(thread && "thread list should not contain NULL threads")(static_cast <bool> (thread && "thread list should not contain NULL threads" ) ? void (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1031, __extension__ __PRETTY_FUNCTION__)); | |||
1032 | ||||
1033 | const ResumeAction *const action = | |||
1034 | resume_actions.GetActionForThread(thread->GetID(), true); | |||
1035 | ||||
1036 | if (action == nullptr) { | |||
1037 | LLDB_LOG(log, "no action specified for pid {0} tid {1}", GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "no action specified for pid {0} tid {1}", GetID( ), thread->GetID()); } while (0) | |||
1038 | thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "no action specified for pid {0} tid {1}", GetID( ), thread->GetID()); } while (0); | |||
1039 | continue; | |||
1040 | } | |||
1041 | ||||
1042 | LLDB_LOG(log, "processing resume action state {0} for pid {1} tid {2}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "processing resume action state {0} for pid {1} tid {2}" , action->state, GetID(), thread->GetID()); } while (0) | |||
1043 | action->state, GetID(), thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "processing resume action state {0} for pid {1} tid {2}" , action->state, GetID(), thread->GetID()); } while (0); | |||
1044 | ||||
1045 | switch (action->state) { | |||
1046 | case eStateRunning: | |||
1047 | case eStateStepping: { | |||
1048 | // Run the thread, possibly feeding it the signal. | |||
1049 | const int signo = action->signal; | |||
1050 | Status error = ResumeThread(static_cast<NativeThreadLinux &>(*thread), | |||
1051 | action->state, signo); | |||
1052 | if (error.Fail()) | |||
1053 | return Status("NativeProcessLinux::%s: failed to resume thread " | |||
1054 | "for pid %" PRIu64"l" "u" ", tid %" PRIu64"l" "u" ", error = %s", | |||
1055 | __FUNCTION__, GetID(), thread->GetID(), | |||
1056 | error.AsCString()); | |||
1057 | ||||
1058 | break; | |||
1059 | } | |||
1060 | ||||
1061 | case eStateSuspended: | |||
1062 | case eStateStopped: | |||
1063 | break; | |||
1064 | ||||
1065 | default: | |||
1066 | return Status("NativeProcessLinux::%s (): unexpected state %s specified " | |||
1067 | "for pid %" PRIu64"l" "u" ", tid %" PRIu64"l" "u", | |||
1068 | __FUNCTION__, StateAsCString(action->state), GetID(), | |||
1069 | thread->GetID()); | |||
1070 | } | |||
1071 | } | |||
1072 | ||||
1073 | return Status(); | |||
1074 | } | |||
1075 | ||||
1076 | Status NativeProcessLinux::Halt() { | |||
1077 | Status error; | |||
1078 | ||||
1079 | if (kill(GetID(), SIGSTOP19) != 0) | |||
1080 | error.SetErrorToErrno(); | |||
1081 | ||||
1082 | return error; | |||
1083 | } | |||
1084 | ||||
1085 | Status NativeProcessLinux::Detach() { | |||
1086 | Status error; | |||
1087 | ||||
1088 | // Tell ptrace to detach from the process. | |||
1089 | if (GetID() == LLDB_INVALID_PROCESS_ID0) | |||
1090 | return error; | |||
1091 | ||||
1092 | for (const auto &thread : m_threads) { | |||
1093 | Status e = Detach(thread->GetID()); | |||
1094 | if (e.Fail()) | |||
1095 | error = | |||
1096 | e; // Save the error, but still attempt to detach from other threads. | |||
1097 | } | |||
1098 | ||||
1099 | m_intel_pt_collector.Clear(); | |||
1100 | ||||
1101 | return error; | |||
1102 | } | |||
1103 | ||||
1104 | Status NativeProcessLinux::Signal(int signo) { | |||
1105 | Status error; | |||
1106 | ||||
1107 | Log *log = GetLog(POSIXLog::Process); | |||
1108 | LLDB_LOG(log, "sending signal {0} ({1}) to pid {1}", signo,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "sending signal {0} ({1}) to pid {1}", signo, Host ::GetSignalAsCString(signo), GetID()); } while (0) | |||
1109 | Host::GetSignalAsCString(signo), GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "sending signal {0} ({1}) to pid {1}", signo, Host ::GetSignalAsCString(signo), GetID()); } while (0); | |||
1110 | ||||
1111 | if (kill(GetID(), signo)) | |||
1112 | error.SetErrorToErrno(); | |||
1113 | ||||
1114 | return error; | |||
1115 | } | |||
1116 | ||||
1117 | Status NativeProcessLinux::Interrupt() { | |||
1118 | // Pick a running thread (or if none, a not-dead stopped thread) as the | |||
1119 | // chosen thread that will be the stop-reason thread. | |||
1120 | Log *log = GetLog(POSIXLog::Process); | |||
1121 | ||||
1122 | NativeThreadProtocol *running_thread = nullptr; | |||
1123 | NativeThreadProtocol *stopped_thread = nullptr; | |||
1124 | ||||
1125 | LLDB_LOG(log, "selecting running thread for interrupt target")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "selecting running thread for interrupt target"); } while (0); | |||
1126 | for (const auto &thread : m_threads) { | |||
1127 | // If we have a running or stepping thread, we'll call that the target of | |||
1128 | // the interrupt. | |||
1129 | const auto thread_state = thread->GetState(); | |||
1130 | if (thread_state == eStateRunning || thread_state == eStateStepping) { | |||
1131 | running_thread = thread.get(); | |||
1132 | break; | |||
1133 | } else if (!stopped_thread && StateIsStoppedState(thread_state, true)) { | |||
1134 | // Remember the first non-dead stopped thread. We'll use that as a | |||
1135 | // backup if there are no running threads. | |||
1136 | stopped_thread = thread.get(); | |||
1137 | } | |||
1138 | } | |||
1139 | ||||
1140 | if (!running_thread && !stopped_thread) { | |||
1141 | Status error("found no running/stepping or live stopped threads as target " | |||
1142 | "for interrupt"); | |||
1143 | LLDB_LOG(log, "skipping due to error: {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "skipping due to error: {0}", error); } while (0); | |||
1144 | ||||
1145 | return error; | |||
1146 | } | |||
1147 | ||||
1148 | NativeThreadProtocol *deferred_signal_thread = | |||
1149 | running_thread ? running_thread : stopped_thread; | |||
1150 | ||||
1151 | LLDB_LOG(log, "pid {0} {1} tid {2} chosen for interrupt target", GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} {1} tid {2} chosen for interrupt target" , GetID(), running_thread ? "running" : "stopped", deferred_signal_thread ->GetID()); } while (0) | |||
1152 | running_thread ? "running" : "stopped",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} {1} tid {2} chosen for interrupt target" , GetID(), running_thread ? "running" : "stopped", deferred_signal_thread ->GetID()); } while (0) | |||
1153 | deferred_signal_thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} {1} tid {2} chosen for interrupt target" , GetID(), running_thread ? "running" : "stopped", deferred_signal_thread ->GetID()); } while (0); | |||
1154 | ||||
1155 | StopRunningThreads(deferred_signal_thread->GetID()); | |||
1156 | ||||
1157 | return Status(); | |||
1158 | } | |||
1159 | ||||
1160 | Status NativeProcessLinux::Kill() { | |||
1161 | Log *log = GetLog(POSIXLog::Process); | |||
1162 | LLDB_LOG(log, "pid {0}", GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0}", GetID()); } while (0); | |||
1163 | ||||
1164 | Status error; | |||
1165 | ||||
1166 | switch (m_state) { | |||
1167 | case StateType::eStateInvalid: | |||
1168 | case StateType::eStateExited: | |||
1169 | case StateType::eStateCrashed: | |||
1170 | case StateType::eStateDetached: | |||
1171 | case StateType::eStateUnloaded: | |||
1172 | // Nothing to do - the process is already dead. | |||
1173 | LLDB_LOG(log, "ignored for PID {0} due to current state: {1}", GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "ignored for PID {0} due to current state: {1}", GetID (), m_state); } while (0) | |||
1174 | m_state)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "ignored for PID {0} due to current state: {1}", GetID (), m_state); } while (0); | |||
1175 | return error; | |||
1176 | ||||
1177 | case StateType::eStateConnected: | |||
1178 | case StateType::eStateAttaching: | |||
1179 | case StateType::eStateLaunching: | |||
1180 | case StateType::eStateStopped: | |||
1181 | case StateType::eStateRunning: | |||
1182 | case StateType::eStateStepping: | |||
1183 | case StateType::eStateSuspended: | |||
1184 | // We can try to kill a process in these states. | |||
1185 | break; | |||
1186 | } | |||
1187 | ||||
1188 | if (kill(GetID(), SIGKILL9) != 0) { | |||
1189 | error.SetErrorToErrno(); | |||
1190 | return error; | |||
1191 | } | |||
1192 | ||||
1193 | return error; | |||
1194 | } | |||
1195 | ||||
1196 | Status NativeProcessLinux::GetMemoryRegionInfo(lldb::addr_t load_addr, | |||
1197 | MemoryRegionInfo &range_info) { | |||
1198 | // FIXME review that the final memory region returned extends to the end of | |||
1199 | // the virtual address space, | |||
1200 | // with no perms if it is not mapped. | |||
1201 | ||||
1202 | // Use an approach that reads memory regions from /proc/{pid}/maps. Assume | |||
1203 | // proc maps entries are in ascending order. | |||
1204 | // FIXME assert if we find differently. | |||
1205 | ||||
1206 | if (m_supports_mem_region == LazyBool::eLazyBoolNo) { | |||
1207 | // We're done. | |||
1208 | return Status("unsupported"); | |||
1209 | } | |||
1210 | ||||
1211 | Status error = PopulateMemoryRegionCache(); | |||
1212 | if (error.Fail()) { | |||
1213 | return error; | |||
1214 | } | |||
1215 | ||||
1216 | lldb::addr_t prev_base_address = 0; | |||
1217 | ||||
1218 | // FIXME start by finding the last region that is <= target address using | |||
1219 | // binary search. Data is sorted. | |||
1220 | // There can be a ton of regions on pthreads apps with lots of threads. | |||
1221 | for (auto it = m_mem_region_cache.begin(); it != m_mem_region_cache.end(); | |||
1222 | ++it) { | |||
1223 | MemoryRegionInfo &proc_entry_info = it->first; | |||
1224 | ||||
1225 | // Sanity check assumption that /proc/{pid}/maps entries are ascending. | |||
1226 | assert((proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) &&(static_cast <bool> ((proc_entry_info.GetRange().GetRangeBase () >= prev_base_address) && "descending /proc/pid/maps entries detected, unexpected" ) ? void (0) : __assert_fail ("(proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) && \"descending /proc/pid/maps entries detected, unexpected\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1227, __extension__ __PRETTY_FUNCTION__)) | |||
1227 | "descending /proc/pid/maps entries detected, unexpected")(static_cast <bool> ((proc_entry_info.GetRange().GetRangeBase () >= prev_base_address) && "descending /proc/pid/maps entries detected, unexpected" ) ? void (0) : __assert_fail ("(proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) && \"descending /proc/pid/maps entries detected, unexpected\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1227, __extension__ __PRETTY_FUNCTION__)); | |||
1228 | prev_base_address = proc_entry_info.GetRange().GetRangeBase(); | |||
1229 | UNUSED_IF_ASSERT_DISABLED(prev_base_address)((void)(prev_base_address)); | |||
1230 | ||||
1231 | // If the target address comes before this entry, indicate distance to next | |||
1232 | // region. | |||
1233 | if (load_addr < proc_entry_info.GetRange().GetRangeBase()) { | |||
1234 | range_info.GetRange().SetRangeBase(load_addr); | |||
1235 | range_info.GetRange().SetByteSize( | |||
1236 | proc_entry_info.GetRange().GetRangeBase() - load_addr); | |||
1237 | range_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo); | |||
1238 | range_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo); | |||
1239 | range_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo); | |||
1240 | range_info.SetMapped(MemoryRegionInfo::OptionalBool::eNo); | |||
1241 | ||||
1242 | return error; | |||
1243 | } else if (proc_entry_info.GetRange().Contains(load_addr)) { | |||
1244 | // The target address is within the memory region we're processing here. | |||
1245 | range_info = proc_entry_info; | |||
1246 | return error; | |||
1247 | } | |||
1248 | ||||
1249 | // The target memory address comes somewhere after the region we just | |||
1250 | // parsed. | |||
1251 | } | |||
1252 | ||||
1253 | // If we made it here, we didn't find an entry that contained the given | |||
1254 | // address. Return the load_addr as start and the amount of bytes betwwen | |||
1255 | // load address and the end of the memory as size. | |||
1256 | range_info.GetRange().SetRangeBase(load_addr); | |||
1257 | range_info.GetRange().SetRangeEnd(LLDB_INVALID_ADDRESS(18446744073709551615UL)); | |||
1258 | range_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo); | |||
1259 | range_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo); | |||
1260 | range_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo); | |||
1261 | range_info.SetMapped(MemoryRegionInfo::OptionalBool::eNo); | |||
1262 | return error; | |||
1263 | } | |||
1264 | ||||
1265 | Status NativeProcessLinux::PopulateMemoryRegionCache() { | |||
1266 | Log *log = GetLog(POSIXLog::Process); | |||
1267 | ||||
1268 | // If our cache is empty, pull the latest. There should always be at least | |||
1269 | // one memory region if memory region handling is supported. | |||
1270 | if (!m_mem_region_cache.empty()) { | |||
1271 | LLDB_LOG(log, "reusing {0} cached memory region entries",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "reusing {0} cached memory region entries", m_mem_region_cache .size()); } while (0) | |||
1272 | m_mem_region_cache.size())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "reusing {0} cached memory region entries", m_mem_region_cache .size()); } while (0); | |||
1273 | return Status(); | |||
1274 | } | |||
1275 | ||||
1276 | Status Result; | |||
1277 | LinuxMapCallback callback = [&](llvm::Expected<MemoryRegionInfo> Info) { | |||
1278 | if (Info) { | |||
1279 | FileSpec file_spec(Info->GetName().GetCString()); | |||
1280 | FileSystem::Instance().Resolve(file_spec); | |||
1281 | m_mem_region_cache.emplace_back(*Info, file_spec); | |||
1282 | return true; | |||
1283 | } | |||
1284 | ||||
1285 | Result = Info.takeError(); | |||
1286 | m_supports_mem_region = LazyBool::eLazyBoolNo; | |||
1287 | LLDB_LOG(log, "failed to parse proc maps: {0}", Result)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "failed to parse proc maps: {0}", Result); } while (0); | |||
1288 | return false; | |||
1289 | }; | |||
1290 | ||||
1291 | // Linux kernel since 2.6.14 has /proc/{pid}/smaps | |||
1292 | // if CONFIG_PROC_PAGE_MONITOR is enabled | |||
1293 | auto BufferOrError = getProcFile(GetID(), GetCurrentThreadID(), "smaps"); | |||
1294 | if (BufferOrError) | |||
1295 | ParseLinuxSMapRegions(BufferOrError.get()->getBuffer(), callback); | |||
1296 | else { | |||
1297 | BufferOrError = getProcFile(GetID(), GetCurrentThreadID(), "maps"); | |||
1298 | if (!BufferOrError) { | |||
1299 | m_supports_mem_region = LazyBool::eLazyBoolNo; | |||
1300 | return BufferOrError.getError(); | |||
1301 | } | |||
1302 | ||||
1303 | ParseLinuxMapRegions(BufferOrError.get()->getBuffer(), callback); | |||
1304 | } | |||
1305 | ||||
1306 | if (Result.Fail()) | |||
1307 | return Result; | |||
1308 | ||||
1309 | if (m_mem_region_cache.empty()) { | |||
1310 | // No entries after attempting to read them. This shouldn't happen if | |||
1311 | // /proc/{pid}/maps is supported. Assume we don't support map entries via | |||
1312 | // procfs. | |||
1313 | m_supports_mem_region = LazyBool::eLazyBoolNo; | |||
1314 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "failed to find any procfs maps entries, assuming no support " "for memory region metadata retrieval"); } while (0) | |||
1315 | "failed to find any procfs maps entries, assuming no support "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "failed to find any procfs maps entries, assuming no support " "for memory region metadata retrieval"); } while (0) | |||
1316 | "for memory region metadata retrieval")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "failed to find any procfs maps entries, assuming no support " "for memory region metadata retrieval"); } while (0); | |||
1317 | return Status("not supported"); | |||
1318 | } | |||
1319 | ||||
1320 | LLDB_LOG(log, "read {0} memory region entries from /proc/{1}/maps",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "read {0} memory region entries from /proc/{1}/maps" , m_mem_region_cache.size(), GetID()); } while (0) | |||
1321 | m_mem_region_cache.size(), GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "read {0} memory region entries from /proc/{1}/maps" , m_mem_region_cache.size(), GetID()); } while (0); | |||
1322 | ||||
1323 | // We support memory retrieval, remember that. | |||
1324 | m_supports_mem_region = LazyBool::eLazyBoolYes; | |||
1325 | return Status(); | |||
1326 | } | |||
1327 | ||||
1328 | void NativeProcessLinux::DoStopIDBumped(uint32_t newBumpId) { | |||
1329 | Log *log = GetLog(POSIXLog::Process); | |||
1330 | LLDB_LOG(log, "newBumpId={0}", newBumpId)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "newBumpId={0}", newBumpId); } while (0); | |||
1331 | LLDB_LOG(log, "clearing {0} entries from memory region cache",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "clearing {0} entries from memory region cache", m_mem_region_cache .size()); } while (0) | |||
1332 | m_mem_region_cache.size())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "clearing {0} entries from memory region cache", m_mem_region_cache .size()); } while (0); | |||
1333 | m_mem_region_cache.clear(); | |||
1334 | } | |||
1335 | ||||
1336 | llvm::Expected<uint64_t> | |||
1337 | NativeProcessLinux::Syscall(llvm::ArrayRef<uint64_t> args) { | |||
1338 | PopulateMemoryRegionCache(); | |||
1339 | auto region_it = llvm::find_if(m_mem_region_cache, [](const auto &pair) { | |||
1340 | return pair.first.GetExecutable() == MemoryRegionInfo::eYes && | |||
1341 | pair.first.GetShared() != MemoryRegionInfo::eYes; | |||
1342 | }); | |||
1343 | if (region_it == m_mem_region_cache.end()) | |||
1344 | return llvm::createStringError(llvm::inconvertibleErrorCode(), | |||
1345 | "No executable memory region found!"); | |||
1346 | ||||
1347 | addr_t exe_addr = region_it->first.GetRange().GetRangeBase(); | |||
1348 | ||||
1349 | NativeThreadLinux &thread = *GetCurrentThread(); | |||
1350 | assert(thread.GetState() == eStateStopped)(static_cast <bool> (thread.GetState() == eStateStopped ) ? void (0) : __assert_fail ("thread.GetState() == eStateStopped" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1350, __extension__ __PRETTY_FUNCTION__)); | |||
1351 | NativeRegisterContextLinux ®_ctx = thread.GetRegisterContext(); | |||
1352 | ||||
1353 | NativeRegisterContextLinux::SyscallData syscall_data = | |||
1354 | *reg_ctx.GetSyscallData(); | |||
1355 | ||||
1356 | WritableDataBufferSP registers_sp; | |||
1357 | if (llvm::Error Err = reg_ctx.ReadAllRegisterValues(registers_sp).ToError()) | |||
1358 | return std::move(Err); | |||
1359 | auto restore_regs = llvm::make_scope_exit( | |||
1360 | [&] { reg_ctx.WriteAllRegisterValues(registers_sp); }); | |||
1361 | ||||
1362 | llvm::SmallVector<uint8_t, 8> memory(syscall_data.Insn.size()); | |||
1363 | size_t bytes_read; | |||
1364 | if (llvm::Error Err = | |||
1365 | ReadMemory(exe_addr, memory.data(), memory.size(), bytes_read) | |||
1366 | .ToError()) { | |||
1367 | return std::move(Err); | |||
1368 | } | |||
1369 | ||||
1370 | auto restore_mem = llvm::make_scope_exit( | |||
1371 | [&] { WriteMemory(exe_addr, memory.data(), memory.size(), bytes_read); }); | |||
1372 | ||||
1373 | if (llvm::Error Err = reg_ctx.SetPC(exe_addr).ToError()) | |||
1374 | return std::move(Err); | |||
1375 | ||||
1376 | for (const auto &zip : llvm::zip_first(args, syscall_data.Args)) { | |||
1377 | if (llvm::Error Err = | |||
1378 | reg_ctx | |||
1379 | .WriteRegisterFromUnsigned(std::get<1>(zip), std::get<0>(zip)) | |||
1380 | .ToError()) { | |||
1381 | return std::move(Err); | |||
1382 | } | |||
1383 | } | |||
1384 | if (llvm::Error Err = WriteMemory(exe_addr, syscall_data.Insn.data(), | |||
1385 | syscall_data.Insn.size(), bytes_read) | |||
1386 | .ToError()) | |||
1387 | return std::move(Err); | |||
1388 | ||||
1389 | m_mem_region_cache.clear(); | |||
1390 | ||||
1391 | // With software single stepping the syscall insn buffer must also include a | |||
1392 | // trap instruction to stop the process. | |||
1393 | int req = SupportHardwareSingleStepping() ? PTRACE_SINGLESTEP : PTRACE_CONT; | |||
1394 | if (llvm::Error Err = | |||
1395 | PtraceWrapper(req, thread.GetID(), nullptr, nullptr).ToError()) | |||
1396 | return std::move(Err); | |||
1397 | ||||
1398 | int status; | |||
1399 | ::pid_t wait_pid = llvm::sys::RetryAfterSignal(-1, ::waitpid, thread.GetID(), | |||
1400 | &status, __WALL0x40000000); | |||
1401 | if (wait_pid == -1) { | |||
1402 | return llvm::errorCodeToError( | |||
1403 | std::error_code(errno(*__errno_location ()), std::generic_category())); | |||
1404 | } | |||
1405 | assert((unsigned)wait_pid == thread.GetID())(static_cast <bool> ((unsigned)wait_pid == thread.GetID ()) ? void (0) : __assert_fail ("(unsigned)wait_pid == thread.GetID()" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1405, __extension__ __PRETTY_FUNCTION__)); | |||
1406 | ||||
1407 | uint64_t result = reg_ctx.ReadRegisterAsUnsigned(syscall_data.Result, -ESRCH3); | |||
1408 | ||||
1409 | // Values larger than this are actually negative errno numbers. | |||
1410 | uint64_t errno_threshold = | |||
1411 | (uint64_t(-1) >> (64 - 8 * m_arch.GetAddressByteSize())) - 0x1000; | |||
1412 | if (result > errno_threshold) { | |||
1413 | return llvm::errorCodeToError( | |||
1414 | std::error_code(-result & 0xfff, std::generic_category())); | |||
1415 | } | |||
1416 | ||||
1417 | return result; | |||
1418 | } | |||
1419 | ||||
1420 | llvm::Expected<addr_t> | |||
1421 | NativeProcessLinux::AllocateMemory(size_t size, uint32_t permissions) { | |||
1422 | ||||
1423 | std::optional<NativeRegisterContextLinux::MmapData> mmap_data = | |||
1424 | GetCurrentThread()->GetRegisterContext().GetMmapData(); | |||
1425 | if (!mmap_data) | |||
1426 | return llvm::make_error<UnimplementedError>(); | |||
1427 | ||||
1428 | unsigned prot = PROT_NONE0x0; | |||
1429 | assert((permissions & (ePermissionsReadable | ePermissionsWritable |(static_cast <bool> ((permissions & (ePermissionsReadable | ePermissionsWritable | ePermissionsExecutable)) == permissions && "Unknown permission!") ? void (0) : __assert_fail ("(permissions & (ePermissionsReadable | ePermissionsWritable | ePermissionsExecutable)) == permissions && \"Unknown permission!\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1431, __extension__ __PRETTY_FUNCTION__)) | |||
1430 | ePermissionsExecutable)) == permissions &&(static_cast <bool> ((permissions & (ePermissionsReadable | ePermissionsWritable | ePermissionsExecutable)) == permissions && "Unknown permission!") ? void (0) : __assert_fail ("(permissions & (ePermissionsReadable | ePermissionsWritable | ePermissionsExecutable)) == permissions && \"Unknown permission!\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1431, __extension__ __PRETTY_FUNCTION__)) | |||
1431 | "Unknown permission!")(static_cast <bool> ((permissions & (ePermissionsReadable | ePermissionsWritable | ePermissionsExecutable)) == permissions && "Unknown permission!") ? void (0) : __assert_fail ("(permissions & (ePermissionsReadable | ePermissionsWritable | ePermissionsExecutable)) == permissions && \"Unknown permission!\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1431, __extension__ __PRETTY_FUNCTION__)); | |||
1432 | if (permissions & ePermissionsReadable) | |||
1433 | prot |= PROT_READ0x1; | |||
1434 | if (permissions & ePermissionsWritable) | |||
1435 | prot |= PROT_WRITE0x2; | |||
1436 | if (permissions & ePermissionsExecutable) | |||
1437 | prot |= PROT_EXEC0x4; | |||
1438 | ||||
1439 | llvm::Expected<uint64_t> Result = | |||
1440 | Syscall({mmap_data->SysMmap, 0, size, prot, MAP_ANONYMOUS0x20 | MAP_PRIVATE0x02, | |||
1441 | uint64_t(-1), 0}); | |||
1442 | if (Result) | |||
1443 | m_allocated_memory.try_emplace(*Result, size); | |||
1444 | return Result; | |||
1445 | } | |||
1446 | ||||
1447 | llvm::Error NativeProcessLinux::DeallocateMemory(lldb::addr_t addr) { | |||
1448 | std::optional<NativeRegisterContextLinux::MmapData> mmap_data = | |||
1449 | GetCurrentThread()->GetRegisterContext().GetMmapData(); | |||
1450 | if (!mmap_data) | |||
1451 | return llvm::make_error<UnimplementedError>(); | |||
1452 | ||||
1453 | auto it = m_allocated_memory.find(addr); | |||
1454 | if (it == m_allocated_memory.end()) | |||
1455 | return llvm::createStringError(llvm::errc::invalid_argument, | |||
1456 | "Memory not allocated by the debugger."); | |||
1457 | ||||
1458 | llvm::Expected<uint64_t> Result = | |||
1459 | Syscall({mmap_data->SysMunmap, addr, it->second}); | |||
1460 | if (!Result) | |||
1461 | return Result.takeError(); | |||
1462 | ||||
1463 | m_allocated_memory.erase(it); | |||
1464 | return llvm::Error::success(); | |||
1465 | } | |||
1466 | ||||
1467 | Status NativeProcessLinux::ReadMemoryTags(int32_t type, lldb::addr_t addr, | |||
1468 | size_t len, | |||
1469 | std::vector<uint8_t> &tags) { | |||
1470 | llvm::Expected<NativeRegisterContextLinux::MemoryTaggingDetails> details = | |||
1471 | GetCurrentThread()->GetRegisterContext().GetMemoryTaggingDetails(type); | |||
1472 | if (!details) | |||
1473 | return Status(details.takeError()); | |||
1474 | ||||
1475 | // Ignore 0 length read | |||
1476 | if (!len) | |||
1477 | return Status(); | |||
1478 | ||||
1479 | // lldb will align the range it requests but it is not required to by | |||
1480 | // the protocol so we'll do it again just in case. | |||
1481 | // Remove tag bits too. Ptrace calls may work regardless but that | |||
1482 | // is not a guarantee. | |||
1483 | MemoryTagManager::TagRange range(details->manager->RemoveTagBits(addr), len); | |||
1484 | range = details->manager->ExpandToGranule(range); | |||
1485 | ||||
1486 | // Allocate enough space for all tags to be read | |||
1487 | size_t num_tags = range.GetByteSize() / details->manager->GetGranuleSize(); | |||
1488 | tags.resize(num_tags * details->manager->GetTagSizeInBytes()); | |||
1489 | ||||
1490 | struct iovec tags_iovec; | |||
1491 | uint8_t *dest = tags.data(); | |||
1492 | lldb::addr_t read_addr = range.GetRangeBase(); | |||
1493 | ||||
1494 | // This call can return partial data so loop until we error or | |||
1495 | // get all tags back. | |||
1496 | while (num_tags) { | |||
1497 | tags_iovec.iov_base = dest; | |||
1498 | tags_iovec.iov_len = num_tags; | |||
1499 | ||||
1500 | Status error = NativeProcessLinux::PtraceWrapper( | |||
1501 | details->ptrace_read_req, GetCurrentThreadID(), | |||
1502 | reinterpret_cast<void *>(read_addr), static_cast<void *>(&tags_iovec), | |||
1503 | 0, nullptr); | |||
1504 | ||||
1505 | if (error.Fail()) { | |||
1506 | // Discard partial reads | |||
1507 | tags.resize(0); | |||
1508 | return error; | |||
1509 | } | |||
1510 | ||||
1511 | size_t tags_read = tags_iovec.iov_len; | |||
1512 | assert(tags_read && (tags_read <= num_tags))(static_cast <bool> (tags_read && (tags_read <= num_tags)) ? void (0) : __assert_fail ("tags_read && (tags_read <= num_tags)" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1512, __extension__ __PRETTY_FUNCTION__)); | |||
1513 | ||||
1514 | dest += tags_read * details->manager->GetTagSizeInBytes(); | |||
1515 | read_addr += details->manager->GetGranuleSize() * tags_read; | |||
1516 | num_tags -= tags_read; | |||
1517 | } | |||
1518 | ||||
1519 | return Status(); | |||
1520 | } | |||
1521 | ||||
1522 | Status NativeProcessLinux::WriteMemoryTags(int32_t type, lldb::addr_t addr, | |||
1523 | size_t len, | |||
1524 | const std::vector<uint8_t> &tags) { | |||
1525 | llvm::Expected<NativeRegisterContextLinux::MemoryTaggingDetails> details = | |||
1526 | GetCurrentThread()->GetRegisterContext().GetMemoryTaggingDetails(type); | |||
1527 | if (!details) | |||
| ||||
1528 | return Status(details.takeError()); | |||
1529 | ||||
1530 | // Ignore 0 length write | |||
1531 | if (!len) | |||
1532 | return Status(); | |||
1533 | ||||
1534 | // lldb will align the range it requests but it is not required to by | |||
1535 | // the protocol so we'll do it again just in case. | |||
1536 | // Remove tag bits too. Ptrace calls may work regardless but that | |||
1537 | // is not a guarantee. | |||
1538 | MemoryTagManager::TagRange range(details->manager->RemoveTagBits(addr), len); | |||
1539 | range = details->manager->ExpandToGranule(range); | |||
1540 | ||||
1541 | // Not checking number of tags here, we may repeat them below | |||
1542 | llvm::Expected<std::vector<lldb::addr_t>> unpacked_tags_or_err = | |||
1543 | details->manager->UnpackTagsData(tags); | |||
1544 | if (!unpacked_tags_or_err) | |||
1545 | return Status(unpacked_tags_or_err.takeError()); | |||
1546 | ||||
1547 | llvm::Expected<std::vector<lldb::addr_t>> repeated_tags_or_err = | |||
1548 | details->manager->RepeatTagsForRange(*unpacked_tags_or_err, range); | |||
1549 | if (!repeated_tags_or_err) | |||
1550 | return Status(repeated_tags_or_err.takeError()); | |||
1551 | ||||
1552 | // Repack them for ptrace to use | |||
1553 | llvm::Expected<std::vector<uint8_t>> final_tag_data = | |||
1554 | details->manager->PackTags(*repeated_tags_or_err); | |||
1555 | if (!final_tag_data) | |||
1556 | return Status(final_tag_data.takeError()); | |||
1557 | ||||
1558 | struct iovec tags_vec; | |||
1559 | uint8_t *src = final_tag_data->data(); | |||
1560 | lldb::addr_t write_addr = range.GetRangeBase(); | |||
1561 | // unpacked tags size because the number of bytes per tag might not be 1 | |||
1562 | size_t num_tags = repeated_tags_or_err->size(); | |||
1563 | ||||
1564 | // This call can partially write tags, so we loop until we | |||
1565 | // error or all tags have been written. | |||
1566 | while (num_tags > 0) { | |||
1567 | tags_vec.iov_base = src; | |||
1568 | tags_vec.iov_len = num_tags; | |||
1569 | ||||
1570 | Status error = NativeProcessLinux::PtraceWrapper( | |||
1571 | details->ptrace_write_req, GetCurrentThreadID(), | |||
1572 | reinterpret_cast<void *>(write_addr), static_cast<void *>(&tags_vec), 0, | |||
1573 | nullptr); | |||
1574 | ||||
1575 | if (error.Fail()) { | |||
1576 | // Don't attempt to restore the original values in the case of a partial | |||
1577 | // write | |||
1578 | return error; | |||
1579 | } | |||
1580 | ||||
1581 | size_t tags_written = tags_vec.iov_len; | |||
1582 | assert(tags_written && (tags_written <= num_tags))(static_cast <bool> (tags_written && (tags_written <= num_tags)) ? void (0) : __assert_fail ("tags_written && (tags_written <= num_tags)" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1582, __extension__ __PRETTY_FUNCTION__)); | |||
1583 | ||||
1584 | src += tags_written * details->manager->GetTagSizeInBytes(); | |||
1585 | write_addr += details->manager->GetGranuleSize() * tags_written; | |||
1586 | num_tags -= tags_written; | |||
1587 | } | |||
1588 | ||||
1589 | return Status(); | |||
1590 | } | |||
1591 | ||||
1592 | size_t NativeProcessLinux::UpdateThreads() { | |||
1593 | // The NativeProcessLinux monitoring threads are always up to date with | |||
1594 | // respect to thread state and they keep the thread list populated properly. | |||
1595 | // All this method needs to do is return the thread count. | |||
1596 | return m_threads.size(); | |||
1597 | } | |||
1598 | ||||
1599 | Status NativeProcessLinux::SetBreakpoint(lldb::addr_t addr, uint32_t size, | |||
1600 | bool hardware) { | |||
1601 | if (hardware) | |||
1602 | return SetHardwareBreakpoint(addr, size); | |||
1603 | else | |||
1604 | return SetSoftwareBreakpoint(addr, size); | |||
1605 | } | |||
1606 | ||||
1607 | Status NativeProcessLinux::RemoveBreakpoint(lldb::addr_t addr, bool hardware) { | |||
1608 | if (hardware) | |||
1609 | return RemoveHardwareBreakpoint(addr); | |||
1610 | else | |||
1611 | return NativeProcessProtocol::RemoveBreakpoint(addr); | |||
1612 | } | |||
1613 | ||||
1614 | llvm::Expected<llvm::ArrayRef<uint8_t>> | |||
1615 | NativeProcessLinux::GetSoftwareBreakpointTrapOpcode(size_t size_hint) { | |||
1616 | // The ARM reference recommends the use of 0xe7fddefe and 0xdefe but the | |||
1617 | // linux kernel does otherwise. | |||
1618 | static const uint8_t g_arm_opcode[] = {0xf0, 0x01, 0xf0, 0xe7}; | |||
1619 | static const uint8_t g_thumb_opcode[] = {0x01, 0xde}; | |||
1620 | ||||
1621 | switch (GetArchitecture().GetMachine()) { | |||
1622 | case llvm::Triple::arm: | |||
1623 | switch (size_hint) { | |||
1624 | case 2: | |||
1625 | return llvm::ArrayRef(g_thumb_opcode); | |||
1626 | case 4: | |||
1627 | return llvm::ArrayRef(g_arm_opcode); | |||
1628 | default: | |||
1629 | return llvm::createStringError(llvm::inconvertibleErrorCode(), | |||
1630 | "Unrecognised trap opcode size hint!"); | |||
1631 | } | |||
1632 | default: | |||
1633 | return NativeProcessProtocol::GetSoftwareBreakpointTrapOpcode(size_hint); | |||
1634 | } | |||
1635 | } | |||
1636 | ||||
1637 | Status NativeProcessLinux::ReadMemory(lldb::addr_t addr, void *buf, size_t size, | |||
1638 | size_t &bytes_read) { | |||
1639 | if (ProcessVmReadvSupported()) { | |||
1640 | // The process_vm_readv path is about 50 times faster than ptrace api. We | |||
1641 | // want to use this syscall if it is supported. | |||
1642 | ||||
1643 | struct iovec local_iov, remote_iov; | |||
1644 | local_iov.iov_base = buf; | |||
1645 | local_iov.iov_len = size; | |||
1646 | remote_iov.iov_base = reinterpret_cast<void *>(addr); | |||
1647 | remote_iov.iov_len = size; | |||
1648 | ||||
1649 | bytes_read = process_vm_readv(GetCurrentThreadID(), &local_iov, 1, | |||
1650 | &remote_iov, 1, 0); | |||
1651 | const bool success = bytes_read == size; | |||
1652 | ||||
1653 | Log *log = GetLog(POSIXLog::Process); | |||
1654 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "using process_vm_readv to read {0} bytes from inferior " "address {1:x}: {2}", size, addr, success ? "Success" : llvm ::sys::StrError((*__errno_location ()))); } while (0) | |||
1655 | "using process_vm_readv to read {0} bytes from inferior "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "using process_vm_readv to read {0} bytes from inferior " "address {1:x}: {2}", size, addr, success ? "Success" : llvm ::sys::StrError((*__errno_location ()))); } while (0) | |||
1656 | "address {1:x}: {2}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "using process_vm_readv to read {0} bytes from inferior " "address {1:x}: {2}", size, addr, success ? "Success" : llvm ::sys::StrError((*__errno_location ()))); } while (0) | |||
1657 | size, addr, success ? "Success" : llvm::sys::StrError(errno))do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "using process_vm_readv to read {0} bytes from inferior " "address {1:x}: {2}", size, addr, success ? "Success" : llvm ::sys::StrError((*__errno_location ()))); } while (0); | |||
1658 | ||||
1659 | if (success) | |||
1660 | return Status(); | |||
1661 | // else the call failed for some reason, let's retry the read using ptrace | |||
1662 | // api. | |||
1663 | } | |||
1664 | ||||
1665 | unsigned char *dst = static_cast<unsigned char *>(buf); | |||
1666 | size_t remainder; | |||
1667 | long data; | |||
1668 | ||||
1669 | Log *log = GetLog(POSIXLog::Memory); | |||
1670 | LLDB_LOG(log, "addr = {0}, buf = {1}, size = {2}", addr, buf, size)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "addr = {0}, buf = {1}, size = {2}", addr, buf, size ); } while (0); | |||
1671 | ||||
1672 | for (bytes_read = 0; bytes_read < size; bytes_read += remainder) { | |||
1673 | Status error = NativeProcessLinux::PtraceWrapper( | |||
1674 | PTRACE_PEEKDATA, GetCurrentThreadID(), (void *)addr, nullptr, 0, &data); | |||
1675 | if (error.Fail()) | |||
1676 | return error; | |||
1677 | ||||
1678 | remainder = size - bytes_read; | |||
1679 | remainder = remainder > k_ptrace_word_size ? k_ptrace_word_size : remainder; | |||
1680 | ||||
1681 | // Copy the data into our buffer | |||
1682 | memcpy(dst, &data, remainder); | |||
1683 | ||||
1684 | LLDB_LOG(log, "[{0:x}]:{1:x}", addr, data)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "[{0:x}]:{1:x}", addr, data); } while (0); | |||
1685 | addr += k_ptrace_word_size; | |||
1686 | dst += k_ptrace_word_size; | |||
1687 | } | |||
1688 | return Status(); | |||
1689 | } | |||
1690 | ||||
1691 | Status NativeProcessLinux::WriteMemory(lldb::addr_t addr, const void *buf, | |||
1692 | size_t size, size_t &bytes_written) { | |||
1693 | const unsigned char *src = static_cast<const unsigned char *>(buf); | |||
1694 | size_t remainder; | |||
1695 | Status error; | |||
1696 | ||||
1697 | Log *log = GetLog(POSIXLog::Memory); | |||
1698 | LLDB_LOG(log, "addr = {0}, buf = {1}, size = {2}", addr, buf, size)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "addr = {0}, buf = {1}, size = {2}", addr, buf, size ); } while (0); | |||
1699 | ||||
1700 | for (bytes_written = 0; bytes_written < size; bytes_written += remainder) { | |||
1701 | remainder = size - bytes_written; | |||
1702 | remainder = remainder > k_ptrace_word_size ? k_ptrace_word_size : remainder; | |||
1703 | ||||
1704 | if (remainder == k_ptrace_word_size) { | |||
1705 | unsigned long data = 0; | |||
1706 | memcpy(&data, src, k_ptrace_word_size); | |||
1707 | ||||
1708 | LLDB_LOG(log, "[{0:x}]:{1:x}", addr, data)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "[{0:x}]:{1:x}", addr, data); } while (0); | |||
1709 | error = NativeProcessLinux::PtraceWrapper( | |||
1710 | PTRACE_POKEDATA, GetCurrentThreadID(), (void *)addr, (void *)data); | |||
1711 | if (error.Fail()) | |||
1712 | return error; | |||
1713 | } else { | |||
1714 | unsigned char buff[8]; | |||
1715 | size_t bytes_read; | |||
1716 | error = ReadMemory(addr, buff, k_ptrace_word_size, bytes_read); | |||
1717 | if (error.Fail()) | |||
1718 | return error; | |||
1719 | ||||
1720 | memcpy(buff, src, remainder); | |||
1721 | ||||
1722 | size_t bytes_written_rec; | |||
1723 | error = WriteMemory(addr, buff, k_ptrace_word_size, bytes_written_rec); | |||
1724 | if (error.Fail()) | |||
1725 | return error; | |||
1726 | ||||
1727 | LLDB_LOG(log, "[{0:x}]:{1:x} ({2:x})", addr, *(const unsigned long *)src,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "[{0:x}]:{1:x} ({2:x})", addr, *(const unsigned long *)src, *(unsigned long *)buff); } while (0) | |||
1728 | *(unsigned long *)buff)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "[{0:x}]:{1:x} ({2:x})", addr, *(const unsigned long *)src, *(unsigned long *)buff); } while (0); | |||
1729 | } | |||
1730 | ||||
1731 | addr += k_ptrace_word_size; | |||
1732 | src += k_ptrace_word_size; | |||
1733 | } | |||
1734 | return error; | |||
1735 | } | |||
1736 | ||||
1737 | Status NativeProcessLinux::GetSignalInfo(lldb::tid_t tid, void *siginfo) const { | |||
1738 | return PtraceWrapper(PTRACE_GETSIGINFO, tid, nullptr, siginfo); | |||
1739 | } | |||
1740 | ||||
1741 | Status NativeProcessLinux::GetEventMessage(lldb::tid_t tid, | |||
1742 | unsigned long *message) { | |||
1743 | return PtraceWrapper(PTRACE_GETEVENTMSG, tid, nullptr, message); | |||
1744 | } | |||
1745 | ||||
1746 | Status NativeProcessLinux::Detach(lldb::tid_t tid) { | |||
1747 | if (tid == LLDB_INVALID_THREAD_ID0) | |||
1748 | return Status(); | |||
1749 | ||||
1750 | return PtraceWrapper(PTRACE_DETACH, tid); | |||
1751 | } | |||
1752 | ||||
1753 | bool NativeProcessLinux::HasThreadNoLock(lldb::tid_t thread_id) { | |||
1754 | for (const auto &thread : m_threads) { | |||
1755 | assert(thread && "thread list should not contain NULL threads")(static_cast <bool> (thread && "thread list should not contain NULL threads" ) ? void (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1755, __extension__ __PRETTY_FUNCTION__)); | |||
1756 | if (thread->GetID() == thread_id) { | |||
1757 | // We have this thread. | |||
1758 | return true; | |||
1759 | } | |||
1760 | } | |||
1761 | ||||
1762 | // We don't have this thread. | |||
1763 | return false; | |||
1764 | } | |||
1765 | ||||
1766 | void NativeProcessLinux::StopTrackingThread(NativeThreadLinux &thread) { | |||
1767 | Log *const log = GetLog(POSIXLog::Thread); | |||
1768 | lldb::tid_t thread_id = thread.GetID(); | |||
1769 | LLDB_LOG(log, "tid: {0}", thread_id)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "tid: {0}", thread_id); } while (0); | |||
1770 | ||||
1771 | auto it = llvm::find_if(m_threads, [&](const auto &thread_up) { | |||
1772 | return thread_up.get() == &thread; | |||
1773 | }); | |||
1774 | assert(it != m_threads.end())(static_cast <bool> (it != m_threads.end()) ? void (0) : __assert_fail ("it != m_threads.end()", "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , 1774, __extension__ __PRETTY_FUNCTION__)); | |||
1775 | m_threads.erase(it); | |||
1776 | ||||
1777 | NotifyTracersOfThreadDestroyed(thread_id); | |||
1778 | SignalIfAllThreadsStopped(); | |||
1779 | } | |||
1780 | ||||
1781 | void NativeProcessLinux::NotifyTracersProcessDidStop() { | |||
1782 | m_intel_pt_collector.ProcessDidStop(); | |||
1783 | } | |||
1784 | ||||
1785 | void NativeProcessLinux::NotifyTracersProcessWillResume() { | |||
1786 | m_intel_pt_collector.ProcessWillResume(); | |||
1787 | } | |||
1788 | ||||
1789 | Status NativeProcessLinux::NotifyTracersOfNewThread(lldb::tid_t tid) { | |||
1790 | Log *log = GetLog(POSIXLog::Thread); | |||
1791 | Status error(m_intel_pt_collector.OnThreadCreated(tid)); | |||
1792 | if (error.Fail()) | |||
1793 | LLDB_LOG(log, "Failed to trace a new thread with intel-pt, tid = {0}. {1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Failed to trace a new thread with intel-pt, tid = {0}. {1}" , tid, error.AsCString()); } while (0) | |||
1794 | tid, error.AsCString())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Failed to trace a new thread with intel-pt, tid = {0}. {1}" , tid, error.AsCString()); } while (0); | |||
1795 | return error; | |||
1796 | } | |||
1797 | ||||
1798 | Status NativeProcessLinux::NotifyTracersOfThreadDestroyed(lldb::tid_t tid) { | |||
1799 | Log *log = GetLog(POSIXLog::Thread); | |||
1800 | Status error(m_intel_pt_collector.OnThreadDestroyed(tid)); | |||
1801 | if (error.Fail()) | |||
1802 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Failed to stop a destroyed thread with intel-pt, tid = {0}. {1}" , tid, error.AsCString()); } while (0) | |||
1803 | "Failed to stop a destroyed thread with intel-pt, tid = {0}. {1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Failed to stop a destroyed thread with intel-pt, tid = {0}. {1}" , tid, error.AsCString()); } while (0) | |||
1804 | tid, error.AsCString())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Failed to stop a destroyed thread with intel-pt, tid = {0}. {1}" , tid, error.AsCString()); } while (0); | |||
1805 | return error; | |||
1806 | } | |||
1807 | ||||
1808 | NativeThreadLinux &NativeProcessLinux::AddThread(lldb::tid_t thread_id, | |||
1809 | bool resume) { | |||
1810 | Log *log = GetLog(POSIXLog::Thread); | |||
1811 | LLDB_LOG(log, "pid {0} adding thread with tid {1}", GetID(), thread_id)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid {0} adding thread with tid {1}", GetID(), thread_id ); } while (0); | |||
1812 | ||||
1813 | assert(!HasThreadNoLock(thread_id) &&(static_cast <bool> (!HasThreadNoLock(thread_id) && "attempted to add a thread by id that already exists") ? void (0) : __assert_fail ("!HasThreadNoLock(thread_id) && \"attempted to add a thread by id that already exists\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1814, __extension__ __PRETTY_FUNCTION__)) | |||
1814 | "attempted to add a thread by id that already exists")(static_cast <bool> (!HasThreadNoLock(thread_id) && "attempted to add a thread by id that already exists") ? void (0) : __assert_fail ("!HasThreadNoLock(thread_id) && \"attempted to add a thread by id that already exists\"" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1814, __extension__ __PRETTY_FUNCTION__)); | |||
1815 | ||||
1816 | // If this is the first thread, save it as the current thread | |||
1817 | if (m_threads.empty()) | |||
1818 | SetCurrentThreadID(thread_id); | |||
1819 | ||||
1820 | m_threads.push_back(std::make_unique<NativeThreadLinux>(*this, thread_id)); | |||
1821 | NativeThreadLinux &thread = | |||
1822 | static_cast<NativeThreadLinux &>(*m_threads.back()); | |||
1823 | ||||
1824 | Status tracing_error = NotifyTracersOfNewThread(thread.GetID()); | |||
1825 | if (tracing_error.Fail()) { | |||
1826 | thread.SetStoppedByProcessorTrace(tracing_error.AsCString()); | |||
1827 | StopRunningThreads(thread.GetID()); | |||
1828 | } else if (resume) | |||
1829 | ResumeThread(thread, eStateRunning, LLDB_INVALID_SIGNAL_NUMBER(2147483647)); | |||
1830 | else | |||
1831 | thread.SetStoppedBySignal(SIGSTOP19); | |||
1832 | ||||
1833 | return thread; | |||
1834 | } | |||
1835 | ||||
1836 | Status NativeProcessLinux::GetLoadedModuleFileSpec(const char *module_path, | |||
1837 | FileSpec &file_spec) { | |||
1838 | Status error = PopulateMemoryRegionCache(); | |||
1839 | if (error.Fail()) | |||
1840 | return error; | |||
1841 | ||||
1842 | FileSpec module_file_spec(module_path); | |||
1843 | FileSystem::Instance().Resolve(module_file_spec); | |||
1844 | ||||
1845 | file_spec.Clear(); | |||
1846 | for (const auto &it : m_mem_region_cache) { | |||
1847 | if (it.second.GetFilename() == module_file_spec.GetFilename()) { | |||
1848 | file_spec = it.second; | |||
1849 | return Status(); | |||
1850 | } | |||
1851 | } | |||
1852 | return Status("Module file (%s) not found in /proc/%" PRIu64"l" "u" "/maps file!", | |||
1853 | module_file_spec.GetFilename().AsCString(), GetID()); | |||
1854 | } | |||
1855 | ||||
1856 | Status NativeProcessLinux::GetFileLoadAddress(const llvm::StringRef &file_name, | |||
1857 | lldb::addr_t &load_addr) { | |||
1858 | load_addr = LLDB_INVALID_ADDRESS(18446744073709551615UL); | |||
1859 | Status error = PopulateMemoryRegionCache(); | |||
1860 | if (error.Fail()) | |||
1861 | return error; | |||
1862 | ||||
1863 | FileSpec file(file_name); | |||
1864 | for (const auto &it : m_mem_region_cache) { | |||
1865 | if (it.second == file) { | |||
1866 | load_addr = it.first.GetRange().GetRangeBase(); | |||
1867 | return Status(); | |||
1868 | } | |||
1869 | } | |||
1870 | return Status("No load address found for specified file."); | |||
1871 | } | |||
1872 | ||||
1873 | NativeThreadLinux *NativeProcessLinux::GetThreadByID(lldb::tid_t tid) { | |||
1874 | return static_cast<NativeThreadLinux *>( | |||
1875 | NativeProcessProtocol::GetThreadByID(tid)); | |||
1876 | } | |||
1877 | ||||
1878 | NativeThreadLinux *NativeProcessLinux::GetCurrentThread() { | |||
1879 | return static_cast<NativeThreadLinux *>( | |||
1880 | NativeProcessProtocol::GetCurrentThread()); | |||
1881 | } | |||
1882 | ||||
1883 | Status NativeProcessLinux::ResumeThread(NativeThreadLinux &thread, | |||
1884 | lldb::StateType state, int signo) { | |||
1885 | Log *const log = GetLog(POSIXLog::Thread); | |||
1886 | LLDB_LOG(log, "tid: {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "tid: {0}", thread.GetID()); } while (0); | |||
1887 | ||||
1888 | // Before we do the resume below, first check if we have a pending stop | |||
1889 | // notification that is currently waiting for all threads to stop. This is | |||
1890 | // potentially a buggy situation since we're ostensibly waiting for threads | |||
1891 | // to stop before we send out the pending notification, and here we are | |||
1892 | // resuming one before we send out the pending stop notification. | |||
1893 | if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0) { | |||
1894 | LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "about to resume tid {0} per explicit request but we have a " "pending stop notification (tid {1}) that is actively " "waiting for this thread to stop. Valid sequence of events?" , thread.GetID(), m_pending_notification_tid); } while (0) | |||
1895 | "about to resume tid {0} per explicit request but we have a "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "about to resume tid {0} per explicit request but we have a " "pending stop notification (tid {1}) that is actively " "waiting for this thread to stop. Valid sequence of events?" , thread.GetID(), m_pending_notification_tid); } while (0) | |||
1896 | "pending stop notification (tid {1}) that is actively "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "about to resume tid {0} per explicit request but we have a " "pending stop notification (tid {1}) that is actively " "waiting for this thread to stop. Valid sequence of events?" , thread.GetID(), m_pending_notification_tid); } while (0) | |||
1897 | "waiting for this thread to stop. Valid sequence of events?",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "about to resume tid {0} per explicit request but we have a " "pending stop notification (tid {1}) that is actively " "waiting for this thread to stop. Valid sequence of events?" , thread.GetID(), m_pending_notification_tid); } while (0) | |||
1898 | thread.GetID(), m_pending_notification_tid)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "about to resume tid {0} per explicit request but we have a " "pending stop notification (tid {1}) that is actively " "waiting for this thread to stop. Valid sequence of events?" , thread.GetID(), m_pending_notification_tid); } while (0); | |||
1899 | } | |||
1900 | ||||
1901 | // Request a resume. We expect this to be synchronous and the system to | |||
1902 | // reflect it is running after this completes. | |||
1903 | switch (state) { | |||
1904 | case eStateRunning: { | |||
1905 | const auto resume_result = thread.Resume(signo); | |||
1906 | if (resume_result.Success()) | |||
1907 | SetState(eStateRunning, true); | |||
1908 | return resume_result; | |||
1909 | } | |||
1910 | case eStateStepping: { | |||
1911 | const auto step_result = thread.SingleStep(signo); | |||
1912 | if (step_result.Success()) | |||
1913 | SetState(eStateRunning, true); | |||
1914 | return step_result; | |||
1915 | } | |||
1916 | default: | |||
1917 | LLDB_LOG(log, "Unhandled state {0}.", state)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "Unhandled state {0}.", state); } while (0); | |||
1918 | llvm_unreachable("Unhandled state for resume")::llvm::llvm_unreachable_internal("Unhandled state for resume" , "lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp", 1918); | |||
1919 | } | |||
1920 | } | |||
1921 | ||||
1922 | //===----------------------------------------------------------------------===// | |||
1923 | ||||
1924 | void NativeProcessLinux::StopRunningThreads(const lldb::tid_t triggering_tid) { | |||
1925 | Log *const log = GetLog(POSIXLog::Thread); | |||
1926 | LLDB_LOG(log, "about to process event: (triggering_tid: {0})",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "about to process event: (triggering_tid: {0})", triggering_tid ); } while (0) | |||
1927 | triggering_tid)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "about to process event: (triggering_tid: {0})", triggering_tid ); } while (0); | |||
1928 | ||||
1929 | m_pending_notification_tid = triggering_tid; | |||
1930 | ||||
1931 | // Request a stop for all the thread stops that need to be stopped and are | |||
1932 | // not already known to be stopped. | |||
1933 | for (const auto &thread : m_threads) { | |||
1934 | if (StateIsRunningState(thread->GetState())) | |||
1935 | static_cast<NativeThreadLinux *>(thread.get())->RequestStop(); | |||
1936 | } | |||
1937 | ||||
1938 | SignalIfAllThreadsStopped(); | |||
1939 | LLDB_LOG(log, "event processing done")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "event processing done"); } while (0); | |||
1940 | } | |||
1941 | ||||
1942 | void NativeProcessLinux::SignalIfAllThreadsStopped() { | |||
1943 | if (m_pending_notification_tid == LLDB_INVALID_THREAD_ID0) | |||
1944 | return; // No pending notification. Nothing to do. | |||
1945 | ||||
1946 | for (const auto &thread_sp : m_threads) { | |||
1947 | if (StateIsRunningState(thread_sp->GetState())) | |||
1948 | return; // Some threads are still running. Don't signal yet. | |||
1949 | } | |||
1950 | ||||
1951 | // We have a pending notification and all threads have stopped. | |||
1952 | Log *log = GetLog(LLDBLog::Process | LLDBLog::Breakpoints); | |||
1953 | ||||
1954 | // Clear any temporary breakpoints we used to implement software single | |||
1955 | // stepping. | |||
1956 | for (const auto &thread_info : m_threads_stepping_with_breakpoint) { | |||
1957 | Status error = RemoveBreakpoint(thread_info.second); | |||
1958 | if (error.Fail()) | |||
1959 | LLDB_LOG(log, "pid = {0} remove stepping breakpoint: {1}",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid = {0} remove stepping breakpoint: {1}", thread_info .first, error); } while (0) | |||
1960 | thread_info.first, error)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "pid = {0} remove stepping breakpoint: {1}", thread_info .first, error); } while (0); | |||
1961 | } | |||
1962 | m_threads_stepping_with_breakpoint.clear(); | |||
1963 | ||||
1964 | // Notify the delegate about the stop | |||
1965 | SetCurrentThreadID(m_pending_notification_tid); | |||
1966 | SetState(StateType::eStateStopped, true); | |||
1967 | m_pending_notification_tid = LLDB_INVALID_THREAD_ID0; | |||
1968 | } | |||
1969 | ||||
1970 | void NativeProcessLinux::ThreadWasCreated(NativeThreadLinux &thread) { | |||
1971 | Log *const log = GetLog(POSIXLog::Thread); | |||
1972 | LLDB_LOG(log, "tid: {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "tid: {0}", thread.GetID()); } while (0); | |||
1973 | ||||
1974 | if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0 && | |||
1975 | StateIsRunningState(thread.GetState())) { | |||
1976 | // We will need to wait for this new thread to stop as well before firing | |||
1977 | // the notification. | |||
1978 | thread.RequestStop(); | |||
1979 | } | |||
1980 | } | |||
1981 | ||||
1982 | // Wrapper for ptrace to catch errors and log calls. Note that ptrace sets | |||
1983 | // errno on error because -1 can be a valid result (i.e. for PTRACE_PEEK*) | |||
1984 | Status NativeProcessLinux::PtraceWrapper(int req, lldb::pid_t pid, void *addr, | |||
1985 | void *data, size_t data_size, | |||
1986 | long *result) { | |||
1987 | Status error; | |||
1988 | long int ret; | |||
1989 | ||||
1990 | Log *log = GetLog(POSIXLog::Ptrace); | |||
1991 | ||||
1992 | PtraceDisplayBytes(req, data, data_size); | |||
1993 | ||||
1994 | errno(*__errno_location ()) = 0; | |||
1995 | if (req == PTRACE_GETREGSETPTRACE_GETREGSET || req == PTRACE_SETREGSETPTRACE_SETREGSET) | |||
1996 | ret = ptrace(static_cast<__ptrace_request>(req), static_cast<::pid_t>(pid), | |||
1997 | *(unsigned int *)addr, data); | |||
1998 | else | |||
1999 | ret = ptrace(static_cast<__ptrace_request>(req), static_cast<::pid_t>(pid), | |||
2000 | addr, data); | |||
2001 | ||||
2002 | if (ret == -1) | |||
2003 | error.SetErrorToErrno(); | |||
2004 | ||||
2005 | if (result) | |||
2006 | *result = ret; | |||
2007 | ||||
2008 | LLDB_LOG(log, "ptrace({0}, {1}, {2}, {3}, {4})={5:x}", req, pid, addr, data,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "ptrace({0}, {1}, {2}, {3}, {4})={5:x}", req, pid , addr, data, data_size, ret); } while (0) | |||
2009 | data_size, ret)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "ptrace({0}, {1}, {2}, {3}, {4})={5:x}", req, pid , addr, data, data_size, ret); } while (0); | |||
2010 | ||||
2011 | PtraceDisplayBytes(req, data, data_size); | |||
2012 | ||||
2013 | if (error.Fail()) | |||
2014 | LLDB_LOG(log, "ptrace() failed: {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp" , __func__, "ptrace() failed: {0}", error); } while (0); | |||
2015 | ||||
2016 | return error; | |||
2017 | } | |||
2018 | ||||
2019 | llvm::Expected<TraceSupportedResponse> NativeProcessLinux::TraceSupported() { | |||
2020 | if (IntelPTCollector::IsSupported()) | |||
2021 | return TraceSupportedResponse{"intel-pt", "Intel Processor Trace"}; | |||
2022 | return NativeProcessProtocol::TraceSupported(); | |||
2023 | } | |||
2024 | ||||
2025 | Error NativeProcessLinux::TraceStart(StringRef json_request, StringRef type) { | |||
2026 | if (type == "intel-pt") { | |||
2027 | if (Expected<TraceIntelPTStartRequest> request = | |||
2028 | json::parse<TraceIntelPTStartRequest>(json_request, | |||
2029 | "TraceIntelPTStartRequest")) { | |||
2030 | return m_intel_pt_collector.TraceStart(*request); | |||
2031 | } else | |||
2032 | return request.takeError(); | |||
2033 | } | |||
2034 | ||||
2035 | return NativeProcessProtocol::TraceStart(json_request, type); | |||
2036 | } | |||
2037 | ||||
2038 | Error NativeProcessLinux::TraceStop(const TraceStopRequest &request) { | |||
2039 | if (request.type == "intel-pt") | |||
2040 | return m_intel_pt_collector.TraceStop(request); | |||
2041 | return NativeProcessProtocol::TraceStop(request); | |||
2042 | } | |||
2043 | ||||
2044 | Expected<json::Value> NativeProcessLinux::TraceGetState(StringRef type) { | |||
2045 | if (type == "intel-pt") | |||
2046 | return m_intel_pt_collector.GetState(); | |||
2047 | return NativeProcessProtocol::TraceGetState(type); | |||
2048 | } | |||
2049 | ||||
2050 | Expected<std::vector<uint8_t>> NativeProcessLinux::TraceGetBinaryData( | |||
2051 | const TraceGetBinaryDataRequest &request) { | |||
2052 | if (request.type == "intel-pt") | |||
2053 | return m_intel_pt_collector.GetBinaryData(request); | |||
2054 | return NativeProcessProtocol::TraceGetBinaryData(request); | |||
2055 | } |