Bug Summary

File:tools/lldb/include/lldb/Utility/TraceOptions.h
Warning:line 27, column 37
Undefined or garbage value returned to caller

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name NativeProcessLinux.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-8/lib/clang/8.0.0 -D HAVE_ROUND -D LLDB_CONFIGURATION_RELEASE -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/lldb/source/Plugins/Process/Linux -I /build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/lldb/include -I /build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/include -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/include -I /build/llvm-toolchain-snapshot-8~svn345461/include -I /usr/include/python2.7 -I /build/llvm-toolchain-snapshot-8~svn345461/tools/clang/include -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/lldb/../clang/include -I /build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/. -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/include/clang/8.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-8/lib/clang/8.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-deprecated-register -Wno-vla-extension -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/lldb/source/Plugins/Process/Linux -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-10-27-211344-32123-1 -x c++ /build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp -faddrsig

/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp

1//===-- NativeProcessLinux.cpp -------------------------------- -*- C++ -*-===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "NativeProcessLinux.h"
11
12// C Includes
13#include <errno(*__errno_location ()).h>
14#include <stdint.h>
15#include <string.h>
16#include <unistd.h>
17
18// C++ Includes
19#include <fstream>
20#include <mutex>
21#include <sstream>
22#include <string>
23#include <unordered_map>
24
25// Other libraries and framework includes
26#include "lldb/Core/EmulateInstruction.h"
27#include "lldb/Core/ModuleSpec.h"
28#include "lldb/Host/Host.h"
29#include "lldb/Host/HostProcess.h"
30#include "lldb/Host/PseudoTerminal.h"
31#include "lldb/Host/ThreadLauncher.h"
32#include "lldb/Host/common/NativeBreakpoint.h"
33#include "lldb/Host/common/NativeRegisterContext.h"
34#include "lldb/Host/linux/Ptrace.h"
35#include "lldb/Host/linux/Uio.h"
36#include "lldb/Host/posix/ProcessLauncherPosixFork.h"
37#include "lldb/Symbol/ObjectFile.h"
38#include "lldb/Target/Process.h"
39#include "lldb/Target/ProcessLaunchInfo.h"
40#include "lldb/Target/Target.h"
41#include "lldb/Utility/LLDBAssert.h"
42#include "lldb/Utility/RegisterValue.h"
43#include "lldb/Utility/State.h"
44#include "lldb/Utility/Status.h"
45#include "lldb/Utility/StringExtractor.h"
46#include "llvm/Support/Errno.h"
47#include "llvm/Support/FileSystem.h"
48#include "llvm/Support/Threading.h"
49
50#include "NativeThreadLinux.h"
51#include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
52#include "Procfs.h"
53
54#include <linux/unistd.h>
55#include <sys/socket.h>
56#include <sys/syscall.h>
57#include <sys/types.h>
58#include <sys/user.h>
59#include <sys/wait.h>
60
61// Support hardware breakpoints in case it has not been defined
62#ifndef TRAP_HWBKPT4
63#define TRAP_HWBKPT4 4
64#endif
65
66using namespace lldb;
67using namespace lldb_private;
68using namespace lldb_private::process_linux;
69using namespace llvm;
70
71// Private bits we only need internally.
72
73static bool ProcessVmReadvSupported() {
74 static bool is_supported;
75 static llvm::once_flag flag;
76
77 llvm::call_once(flag, [] {
78 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
79
80 uint32_t source = 0x47424742;
81 uint32_t dest = 0;
82
83 struct iovec local, remote;
84 remote.iov_base = &source;
85 local.iov_base = &dest;
86 remote.iov_len = local.iov_len = sizeof source;
87
88 // We shall try if cross-process-memory reads work by attempting to read a
89 // value from our own process.
90 ssize_t res = process_vm_readv(getpid(), &local, 1, &remote, 1, 0);
91 is_supported = (res == sizeof(source) && source == dest);
92 if (is_supported)
93 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Detected kernel support for process_vm_readv syscall. "
"Fast memory reads enabled."); } while (0)
94 "Detected kernel support for process_vm_readv syscall. "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Detected kernel support for process_vm_readv syscall. "
"Fast memory reads enabled."); } while (0)
95 "Fast memory reads enabled.")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Detected kernel support for process_vm_readv syscall. "
"Fast memory reads enabled."); } while (0)
;
96 else
97 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "syscall process_vm_readv failed (error: {0}). Fast memory "
"reads disabled.", llvm::sys::StrError()); } while (0)
98 "syscall process_vm_readv failed (error: {0}). Fast memory "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "syscall process_vm_readv failed (error: {0}). Fast memory "
"reads disabled.", llvm::sys::StrError()); } while (0)
99 "reads disabled.",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "syscall process_vm_readv failed (error: {0}). Fast memory "
"reads disabled.", llvm::sys::StrError()); } while (0)
100 llvm::sys::StrError())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "syscall process_vm_readv failed (error: {0}). Fast memory "
"reads disabled.", llvm::sys::StrError()); } while (0)
;
101 });
102
103 return is_supported;
104}
105
106namespace {
107void MaybeLogLaunchInfo(const ProcessLaunchInfo &info) {
108 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
109 if (!log)
110 return;
111
112 if (const FileAction *action = info.GetFileActionForFD(STDIN_FILENO0))
113 LLDB_LOG(log, "setting STDIN to '{0}'", action->GetFileSpec())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "setting STDIN to '{0}'", action->GetFileSpec(
)); } while (0)
;
114 else
115 LLDB_LOG(log, "leaving STDIN as is")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "leaving STDIN as is"); } while (0)
;
116
117 if (const FileAction *action = info.GetFileActionForFD(STDOUT_FILENO1))
118 LLDB_LOG(log, "setting STDOUT to '{0}'", action->GetFileSpec())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "setting STDOUT to '{0}'", action->GetFileSpec
()); } while (0)
;
119 else
120 LLDB_LOG(log, "leaving STDOUT as is")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "leaving STDOUT as is"); } while (0)
;
121
122 if (const FileAction *action = info.GetFileActionForFD(STDERR_FILENO2))
123 LLDB_LOG(log, "setting STDERR to '{0}'", action->GetFileSpec())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "setting STDERR to '{0}'", action->GetFileSpec
()); } while (0)
;
124 else
125 LLDB_LOG(log, "leaving STDERR as is")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "leaving STDERR as is"); } while (0)
;
126
127 int i = 0;
128 for (const char **args = info.GetArguments().GetConstArgumentVector(); *args;
129 ++args, ++i)
130 LLDB_LOG(log, "arg {0}: '{1}'", i, *args)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "arg {0}: '{1}'", i, *args); } while (0)
;
131}
132
133void DisplayBytes(StreamString &s, void *bytes, uint32_t count) {
134 uint8_t *ptr = (uint8_t *)bytes;
135 const uint32_t loop_count = std::min<uint32_t>(DEBUG_PTRACE_MAXBYTES20, count);
136 for (uint32_t i = 0; i < loop_count; i++) {
137 s.Printf("[%x]", *ptr);
138 ptr++;
139 }
140}
141
142void PtraceDisplayBytes(int &req, void *data, size_t data_size) {
143 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
144 if (!log)
145 return;
146 StreamString buf;
147
148 switch (req) {
149 case PTRACE_POKETEXT: {
150 DisplayBytes(buf, &data, 8);
151 LLDB_LOGV(log, "PTRACE_POKETEXT {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private
&& log_private->GetVerbose()) log_private->Format
("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "PTRACE_POKETEXT {0}", buf.GetData()); } while (0
)
;
152 break;
153 }
154 case PTRACE_POKEDATA: {
155 DisplayBytes(buf, &data, 8);
156 LLDB_LOGV(log, "PTRACE_POKEDATA {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private
&& log_private->GetVerbose()) log_private->Format
("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "PTRACE_POKEDATA {0}", buf.GetData()); } while (0
)
;
157 break;
158 }
159 case PTRACE_POKEUSER: {
160 DisplayBytes(buf, &data, 8);
161 LLDB_LOGV(log, "PTRACE_POKEUSER {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private
&& log_private->GetVerbose()) log_private->Format
("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "PTRACE_POKEUSER {0}", buf.GetData()); } while (0
)
;
162 break;
163 }
164 case PTRACE_SETREGS13: {
165 DisplayBytes(buf, data, data_size);
166 LLDB_LOGV(log, "PTRACE_SETREGS {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private
&& log_private->GetVerbose()) log_private->Format
("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "PTRACE_SETREGS {0}", buf.GetData()); } while (0)
;
167 break;
168 }
169 case PTRACE_SETFPREGS15: {
170 DisplayBytes(buf, data, data_size);
171 LLDB_LOGV(log, "PTRACE_SETFPREGS {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private
&& log_private->GetVerbose()) log_private->Format
("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "PTRACE_SETFPREGS {0}", buf.GetData()); } while (
0)
;
172 break;
173 }
174 case PTRACE_SETSIGINFO: {
175 DisplayBytes(buf, data, sizeof(siginfo_t));
176 LLDB_LOGV(log, "PTRACE_SETSIGINFO {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private
&& log_private->GetVerbose()) log_private->Format
("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "PTRACE_SETSIGINFO {0}", buf.GetData()); } while (
0)
;
177 break;
178 }
179 case PTRACE_SETREGSETPTRACE_SETREGSET: {
180 // Extract iov_base from data, which is a pointer to the struct iovec
181 DisplayBytes(buf, *(void **)data, data_size);
182 LLDB_LOGV(log, "PTRACE_SETREGSET {0}", buf.GetData())do { ::lldb_private::Log *log_private = (log); if (log_private
&& log_private->GetVerbose()) log_private->Format
("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "PTRACE_SETREGSET {0}", buf.GetData()); } while (
0)
;
183 break;
184 }
185 default: {}
186 }
187}
188
189static constexpr unsigned k_ptrace_word_size = sizeof(void *);
190static_assert(sizeof(long) >= k_ptrace_word_size,
191 "Size of long must be larger than ptrace word size");
192} // end of anonymous namespace
193
194// Simple helper function to ensure flags are enabled on the given file
195// descriptor.
196static Status EnsureFDFlags(int fd, int flags) {
197 Status error;
198
199 int status = fcntl(fd, F_GETFL3);
200 if (status == -1) {
201 error.SetErrorToErrno();
202 return error;
203 }
204
205 if (fcntl(fd, F_SETFL4, status | flags) == -1) {
206 error.SetErrorToErrno();
207 return error;
208 }
209
210 return error;
211}
212
213// -----------------------------------------------------------------------------
214// Public Static Methods
215// -----------------------------------------------------------------------------
216
217llvm::Expected<std::unique_ptr<NativeProcessProtocol>>
218NativeProcessLinux::Factory::Launch(ProcessLaunchInfo &launch_info,
219 NativeDelegate &native_delegate,
220 MainLoop &mainloop) const {
221 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
222
223 MaybeLogLaunchInfo(launch_info);
224
225 Status status;
226 ::pid_t pid = ProcessLauncherPosixFork()
227 .LaunchProcess(launch_info, status)
228 .GetProcessId();
229 LLDB_LOG(log, "pid = {0:x}", pid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0:x}", pid); } while (0)
;
230 if (status.Fail()) {
231 LLDB_LOG(log, "failed to launch process: {0}", status)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to launch process: {0}", status); } while
(0)
;
232 return status.ToError();
233 }
234
235 // Wait for the child process to trap on its call to execve.
236 int wstatus;
237 ::pid_t wpid = llvm::sys::RetryAfterSignal(-1, ::waitpid, pid, &wstatus, 0);
238 assert(wpid == pid)((wpid == pid) ? static_cast<void> (0) : __assert_fail (
"wpid == pid", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 238, __PRETTY_FUNCTION__))
;
239 (void)wpid;
240 if (!WIFSTOPPED(wstatus)(((wstatus) & 0xff) == 0x7f)) {
241 LLDB_LOG(log, "Could not sync with inferior process: wstatus={1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Could not sync with inferior process: wstatus={1}"
, WaitStatus::Decode(wstatus)); } while (0)
242 WaitStatus::Decode(wstatus))do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Could not sync with inferior process: wstatus={1}"
, WaitStatus::Decode(wstatus)); } while (0)
;
243 return llvm::make_error<StringError>("Could not sync with inferior process",
244 llvm::inconvertibleErrorCode());
245 }
246 LLDB_LOG(log, "inferior started, now in stopped state")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "inferior started, now in stopped state"); } while
(0)
;
247
248 ProcessInstanceInfo Info;
249 if (!Host::GetProcessInfo(pid, Info)) {
250 return llvm::make_error<StringError>("Cannot get process architecture",
251 llvm::inconvertibleErrorCode());
252 }
253
254 // Set the architecture to the exe architecture.
255 LLDB_LOG(log, "pid = {0:x}, detected architecture {1}", pid,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0:x}, detected architecture {1}", pid, Info
.GetArchitecture().GetArchitectureName()); } while (0)
256 Info.GetArchitecture().GetArchitectureName())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0:x}, detected architecture {1}", pid, Info
.GetArchitecture().GetArchitectureName()); } while (0)
;
257
258 status = SetDefaultPtraceOpts(pid);
259 if (status.Fail()) {
260 LLDB_LOG(log, "failed to set default ptrace options: {0}", status)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to set default ptrace options: {0}", status
); } while (0)
;
261 return status.ToError();
262 }
263
264 return std::unique_ptr<NativeProcessLinux>(new NativeProcessLinux(
265 pid, launch_info.GetPTY().ReleaseMasterFileDescriptor(), native_delegate,
266 Info.GetArchitecture(), mainloop, {pid}));
267}
268
269llvm::Expected<std::unique_ptr<NativeProcessProtocol>>
270NativeProcessLinux::Factory::Attach(
271 lldb::pid_t pid, NativeProcessProtocol::NativeDelegate &native_delegate,
272 MainLoop &mainloop) const {
273 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
274 LLDB_LOG(log, "pid = {0:x}", pid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0:x}", pid); } while (0)
;
275
276 // Retrieve the architecture for the running process.
277 ProcessInstanceInfo Info;
278 if (!Host::GetProcessInfo(pid, Info)) {
279 return llvm::make_error<StringError>("Cannot get process architecture",
280 llvm::inconvertibleErrorCode());
281 }
282
283 auto tids_or = NativeProcessLinux::Attach(pid);
284 if (!tids_or)
285 return tids_or.takeError();
286
287 return std::unique_ptr<NativeProcessLinux>(new NativeProcessLinux(
288 pid, -1, native_delegate, Info.GetArchitecture(), mainloop, *tids_or));
289}
290
291// -----------------------------------------------------------------------------
292// Public Instance Methods
293// -----------------------------------------------------------------------------
294
295NativeProcessLinux::NativeProcessLinux(::pid_t pid, int terminal_fd,
296 NativeDelegate &delegate,
297 const ArchSpec &arch, MainLoop &mainloop,
298 llvm::ArrayRef<::pid_t> tids)
299 : NativeProcessProtocol(pid, terminal_fd, delegate), m_arch(arch) {
300 if (m_terminal_fd != -1) {
301 Status status = EnsureFDFlags(m_terminal_fd, O_NONBLOCK04000);
302 assert(status.Success())((status.Success()) ? static_cast<void> (0) : __assert_fail
("status.Success()", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 302, __PRETTY_FUNCTION__))
;
303 }
304
305 Status status;
306 m_sigchld_handle = mainloop.RegisterSignal(
307 SIGCHLD17, [this](MainLoopBase &) { SigchldHandler(); }, status);
308 assert(m_sigchld_handle && status.Success())((m_sigchld_handle && status.Success()) ? static_cast
<void> (0) : __assert_fail ("m_sigchld_handle && status.Success()"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 308, __PRETTY_FUNCTION__))
;
309
310 for (const auto &tid : tids) {
311 NativeThreadLinux &thread = AddThread(tid);
312 thread.SetStoppedBySignal(SIGSTOP19);
313 ThreadWasCreated(thread);
314 }
315
316 // Let our process instance know the thread has stopped.
317 SetCurrentThreadID(tids[0]);
318 SetState(StateType::eStateStopped, false);
319
320 // Proccess any signals we received before installing our handler
321 SigchldHandler();
322}
323
324llvm::Expected<std::vector<::pid_t>> NativeProcessLinux::Attach(::pid_t pid) {
325 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
326
327 Status status;
328 // Use a map to keep track of the threads which we have attached/need to
329 // attach.
330 Host::TidMap tids_to_attach;
331 while (Host::FindProcessThreads(pid, tids_to_attach)) {
332 for (Host::TidMap::iterator it = tids_to_attach.begin();
333 it != tids_to_attach.end();) {
334 if (it->second == false) {
335 lldb::tid_t tid = it->first;
336
337 // Attach to the requested process.
338 // An attach will cause the thread to stop with a SIGSTOP.
339 if ((status = PtraceWrapper(PTRACE_ATTACH, tid)).Fail()) {
340 // No such thread. The thread may have exited. More error handling
341 // may be needed.
342 if (status.GetError() == ESRCH3) {
343 it = tids_to_attach.erase(it);
344 continue;
345 }
346 return status.ToError();
347 }
348
349 int wpid =
350 llvm::sys::RetryAfterSignal(-1, ::waitpid, tid, nullptr, __WALL0x40000000);
351 // Need to use __WALL otherwise we receive an error with errno=ECHLD At
352 // this point we should have a thread stopped if waitpid succeeds.
353 if (wpid < 0) {
354 // No such thread. The thread may have exited. More error handling
355 // may be needed.
356 if (errno(*__errno_location ()) == ESRCH3) {
357 it = tids_to_attach.erase(it);
358 continue;
359 }
360 return llvm::errorCodeToError(
361 std::error_code(errno(*__errno_location ()), std::generic_category()));
362 }
363
364 if ((status = SetDefaultPtraceOpts(tid)).Fail())
365 return status.ToError();
366
367 LLDB_LOG(log, "adding tid = {0}", tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "adding tid = {0}", tid); } while (0)
;
368 it->second = true;
369 }
370
371 // move the loop forward
372 ++it;
373 }
374 }
375
376 size_t tid_count = tids_to_attach.size();
377 if (tid_count == 0)
378 return llvm::make_error<StringError>("No such process",
379 llvm::inconvertibleErrorCode());
380
381 std::vector<::pid_t> tids;
382 tids.reserve(tid_count);
383 for (const auto &p : tids_to_attach)
384 tids.push_back(p.first);
385 return std::move(tids);
386}
387
388Status NativeProcessLinux::SetDefaultPtraceOpts(lldb::pid_t pid) {
389 long ptrace_opts = 0;
390
391 // Have the child raise an event on exit. This is used to keep the child in
392 // limbo until it is destroyed.
393 ptrace_opts |= PTRACE_O_TRACEEXIT;
394
395 // Have the tracer trace threads which spawn in the inferior process.
396 // TODO: if we want to support tracing the inferiors' child, add the
397 // appropriate ptrace flags here (PTRACE_O_TRACEFORK, PTRACE_O_TRACEVFORK)
398 ptrace_opts |= PTRACE_O_TRACECLONE;
399
400 // Have the tracer notify us before execve returns (needed to disable legacy
401 // SIGTRAP generation)
402 ptrace_opts |= PTRACE_O_TRACEEXEC;
403
404 return PtraceWrapper(PTRACE_SETOPTIONS, pid, nullptr, (void *)ptrace_opts);
405}
406
407// Handles all waitpid events from the inferior process.
408void NativeProcessLinux::MonitorCallback(lldb::pid_t pid, bool exited,
409 WaitStatus status) {
410 Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS(1u << 1)));
411
412 // Certain activities differ based on whether the pid is the tid of the main
413 // thread.
414 const bool is_main_thread = (pid == GetID());
415
416 // Handle when the thread exits.
417 if (exited) {
418 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "got exit signal({0}) , tid = {1} ({2} main thread), process "
"state = {3}", signal, pid, is_main_thread ? "is" : "is not"
, GetState()); } while (0)
419 "got exit signal({0}) , tid = {1} ({2} main thread), process "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "got exit signal({0}) , tid = {1} ({2} main thread), process "
"state = {3}", signal, pid, is_main_thread ? "is" : "is not"
, GetState()); } while (0)
420 "state = {3}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "got exit signal({0}) , tid = {1} ({2} main thread), process "
"state = {3}", signal, pid, is_main_thread ? "is" : "is not"
, GetState()); } while (0)
421 signal, pid, is_main_thread ? "is" : "is not", GetState())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "got exit signal({0}) , tid = {1} ({2} main thread), process "
"state = {3}", signal, pid, is_main_thread ? "is" : "is not"
, GetState()); } while (0)
;
422
423 // This is a thread that exited. Ensure we're not tracking it anymore.
424 StopTrackingThread(pid);
425
426 if (is_main_thread) {
427 // The main thread exited. We're done monitoring. Report to delegate.
428 SetExitStatus(status, true);
429
430 // Notify delegate that our process has exited.
431 SetState(StateType::eStateExited, true);
432 }
433 return;
434 }
435
436 siginfo_t info;
437 const auto info_err = GetSignalInfo(pid, &info);
438 auto thread_sp = GetThreadByID(pid);
439
440 if (!thread_sp) {
441 // Normally, the only situation when we cannot find the thread is if we
442 // have just received a new thread notification. This is indicated by
443 // GetSignalInfo() returning si_code == SI_USER and si_pid == 0
444 LLDB_LOG(log, "received notification about an unknown tid {0}.", pid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received notification about an unknown tid {0}."
, pid); } while (0)
;
445
446 if (info_err.Fail()) {
447 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "(tid {0}) GetSignalInfo failed ({1}). " "Ingoring this notification."
, pid, info_err); } while (0)
448 "(tid {0}) GetSignalInfo failed ({1}). "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "(tid {0}) GetSignalInfo failed ({1}). " "Ingoring this notification."
, pid, info_err); } while (0)
449 "Ingoring this notification.",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "(tid {0}) GetSignalInfo failed ({1}). " "Ingoring this notification."
, pid, info_err); } while (0)
450 pid, info_err)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "(tid {0}) GetSignalInfo failed ({1}). " "Ingoring this notification."
, pid, info_err); } while (0)
;
451 return;
452 }
453
454 LLDB_LOG(log, "tid {0}, si_code: {1}, si_pid: {2}", pid, info.si_code,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "tid {0}, si_code: {1}, si_pid: {2}", pid, info.si_code
, info._sifields._kill.si_pid); } while (0)
455 info.si_pid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "tid {0}, si_code: {1}, si_pid: {2}", pid, info.si_code
, info._sifields._kill.si_pid); } while (0)
;
456
457 NativeThreadLinux &thread = AddThread(pid);
458
459 // Resume the newly created thread.
460 ResumeThread(thread, eStateRunning, LLDB_INVALID_SIGNAL_NUMBER(2147483647));
461 ThreadWasCreated(thread);
462 return;
463 }
464
465 // Get details on the signal raised.
466 if (info_err.Success()) {
467 // We have retrieved the signal info. Dispatch appropriately.
468 if (info.si_signo == SIGTRAP5)
469 MonitorSIGTRAP(info, *thread_sp);
470 else
471 MonitorSignal(info, *thread_sp, exited);
472 } else {
473 if (info_err.GetError() == EINVAL22) {
474 // This is a group stop reception for this tid. We can reach here if we
475 // reinject SIGSTOP, SIGSTP, SIGTTIN or SIGTTOU into the tracee,
476 // triggering the group-stop mechanism. Normally receiving these would
477 // stop the process, pending a SIGCONT. Simulating this state in a
478 // debugger is hard and is generally not needed (one use case is
479 // debugging background task being managed by a shell). For general use,
480 // it is sufficient to stop the process in a signal-delivery stop which
481 // happens before the group stop. This done by MonitorSignal and works
482 // correctly for all signals.
483 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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(), pid); } while (0)
484 "received a group stop for pid {0} tid {1}. Transparent "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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(), pid); } while (0)
485 "handling of group stops not supported, resuming the "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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(), pid); } while (0)
486 "thread.",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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(), pid); } while (0)
487 GetID(), pid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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(), pid); } while (0)
;
488 ResumeThread(*thread_sp, thread_sp->GetState(),
489 LLDB_INVALID_SIGNAL_NUMBER(2147483647));
490 } else {
491 // ptrace(GETSIGINFO) failed (but not due to group-stop).
492
493 // A return value of ESRCH means the thread/process is no longer on the
494 // system, so it was killed somehow outside of our control. Either way,
495 // we can't do anything with it anymore.
496
497 // Stop tracking the metadata for the thread since it's entirely off the
498 // system now.
499 const bool thread_found = StopTrackingThread(pid);
500
501 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "GetSignalInfo failed: {0}, tid = {1}, signal = {2}, "
"status = {3}, main_thread = {4}, thread_found: {5}", info_err
, pid, signal, status, is_main_thread, thread_found); } while
(0)
502 "GetSignalInfo failed: {0}, tid = {1}, signal = {2}, "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "GetSignalInfo failed: {0}, tid = {1}, signal = {2}, "
"status = {3}, main_thread = {4}, thread_found: {5}", info_err
, pid, signal, status, is_main_thread, thread_found); } while
(0)
503 "status = {3}, main_thread = {4}, thread_found: {5}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "GetSignalInfo failed: {0}, tid = {1}, signal = {2}, "
"status = {3}, main_thread = {4}, thread_found: {5}", info_err
, pid, signal, status, is_main_thread, thread_found); } while
(0)
504 info_err, pid, signal, status, is_main_thread, thread_found)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "GetSignalInfo failed: {0}, tid = {1}, signal = {2}, "
"status = {3}, main_thread = {4}, thread_found: {5}", info_err
, pid, signal, status, is_main_thread, thread_found); } while
(0)
;
505
506 if (is_main_thread) {
507 // Notify the delegate - our process is not available but appears to
508 // have been killed outside our control. Is eStateExited the right
509 // exit state in this case?
510 SetExitStatus(status, true);
511 SetState(StateType::eStateExited, true);
512 } else {
513 // This thread was pulled out from underneath us. Anything to do here?
514 // Do we want to do an all stop?
515 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1} non-main thread exit occurred, didn't "
"tell delegate anything since thread disappeared out " "from underneath us"
, GetID(), pid); } while (0)
516 "pid {0} tid {1} non-main thread exit occurred, didn't "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1} non-main thread exit occurred, didn't "
"tell delegate anything since thread disappeared out " "from underneath us"
, GetID(), pid); } while (0)
517 "tell delegate anything since thread disappeared out "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1} non-main thread exit occurred, didn't "
"tell delegate anything since thread disappeared out " "from underneath us"
, GetID(), pid); } while (0)
518 "from underneath us",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1} non-main thread exit occurred, didn't "
"tell delegate anything since thread disappeared out " "from underneath us"
, GetID(), pid); } while (0)
519 GetID(), pid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1} non-main thread exit occurred, didn't "
"tell delegate anything since thread disappeared out " "from underneath us"
, GetID(), pid); } while (0)
;
520 }
521 }
522 }
523}
524
525void NativeProcessLinux::WaitForNewThread(::pid_t tid) {
526 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
527
528 if (GetThreadByID(tid)) {
529 // We are already tracking the thread - we got the event on the new thread
530 // (see MonitorSignal) before this one. We are done.
531 return;
532 }
533
534 // The thread is not tracked yet, let's wait for it to appear.
535 int status = -1;
536 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received thread creation event for tid {0}. tid not tracked "
"yet, waiting for thread to appear...", tid); } while (0)
537 "received thread creation event for tid {0}. tid not tracked "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received thread creation event for tid {0}. tid not tracked "
"yet, waiting for thread to appear...", tid); } while (0)
538 "yet, waiting for thread to appear...",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received thread creation event for tid {0}. tid not tracked "
"yet, waiting for thread to appear...", tid); } while (0)
539 tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received thread creation event for tid {0}. tid not tracked "
"yet, waiting for thread to appear...", tid); } while (0)
;
540 ::pid_t wait_pid = llvm::sys::RetryAfterSignal(-1, ::waitpid, tid, &status, __WALL0x40000000);
541 // Since we are waiting on a specific tid, this must be the creation event.
542 // But let's do some checks just in case.
543 if (wait_pid != tid) {
544 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waiting for tid {0} failed. Assuming the thread has "
"disappeared in the meantime", tid); } while (0)
545 "waiting for tid {0} failed. Assuming the thread has "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waiting for tid {0} failed. Assuming the thread has "
"disappeared in the meantime", tid); } while (0)
546 "disappeared in the meantime",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waiting for tid {0} failed. Assuming the thread has "
"disappeared in the meantime", tid); } while (0)
547 tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waiting for tid {0} failed. Assuming the thread has "
"disappeared in the meantime", tid); } while (0)
;
548 // The only way I know of this could happen is if the whole process was
549 // SIGKILLed in the mean time. In any case, we can't do anything about that
550 // now.
551 return;
552 }
553 if (WIFEXITED(status)(((status) & 0x7f) == 0)) {
554 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waiting for tid {0} returned an 'exited' event. Not "
"tracking the thread.", tid); } while (0)
555 "waiting for tid {0} returned an 'exited' event. Not "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waiting for tid {0} returned an 'exited' event. Not "
"tracking the thread.", tid); } while (0)
556 "tracking the thread.",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waiting for tid {0} returned an 'exited' event. Not "
"tracking the thread.", tid); } while (0)
557 tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waiting for tid {0} returned an 'exited' event. Not "
"tracking the thread.", tid); } while (0)
;
558 // Also a very improbable event.
559 return;
560 }
561
562 LLDB_LOG(log, "pid = {0}: tracking new thread tid {1}", GetID(), tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0}: tracking new thread tid {1}", GetID()
, tid); } while (0)
;
563 NativeThreadLinux &new_thread = AddThread(tid);
564
565 ResumeThread(new_thread, eStateRunning, LLDB_INVALID_SIGNAL_NUMBER(2147483647));
566 ThreadWasCreated(new_thread);
567}
568
569void NativeProcessLinux::MonitorSIGTRAP(const siginfo_t &info,
570 NativeThreadLinux &thread) {
571 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
572 const bool is_main_thread = (thread.GetID() == GetID());
573
574 assert(info.si_signo == SIGTRAP && "Unexpected child signal!")((info.si_signo == 5 && "Unexpected child signal!") ?
static_cast<void> (0) : __assert_fail ("info.si_signo == SIGTRAP && \"Unexpected child signal!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 574, __PRETTY_FUNCTION__))
;
575
576 switch (info.si_code) {
577 // TODO: these two cases are required if we want to support tracing of the
578 // inferiors' children. We'd need this to debug a monitor. case (SIGTRAP |
579 // (PTRACE_EVENT_FORK << 8)): case (SIGTRAP | (PTRACE_EVENT_VFORK << 8)):
580
581 case (SIGTRAP5 | (PTRACE_EVENT_CLONE << 8)): {
582 // This is the notification on the parent thread which informs us of new
583 // thread creation. We don't want to do anything with the parent thread so
584 // we just resume it. In case we want to implement "break on thread
585 // creation" functionality, we would need to stop here.
586
587 unsigned long event_message = 0;
588 if (GetEventMessage(thread.GetID(), &event_message).Fail()) {
589 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} received thread creation event but " "GetEventMessage failed so we don't know the new tid"
, thread.GetID()); } while (0)
590 "pid {0} received thread creation event but "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} received thread creation event but " "GetEventMessage failed so we don't know the new tid"
, thread.GetID()); } while (0)
591 "GetEventMessage failed so we don't know the new tid",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} received thread creation event but " "GetEventMessage failed so we don't know the new tid"
, thread.GetID()); } while (0)
592 thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} received thread creation event but " "GetEventMessage failed so we don't know the new tid"
, thread.GetID()); } while (0)
;
593 } else
594 WaitForNewThread(event_message);
595
596 ResumeThread(thread, thread.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647));
597 break;
598 }
599
600 case (SIGTRAP5 | (PTRACE_EVENT_EXEC << 8)): {
601 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received exec event, code = {0}", info.si_code ^
5); } while (0)
;
602
603 // Exec clears any pending notifications.
604 m_pending_notification_tid = LLDB_INVALID_THREAD_ID0;
605
606 // Remove all but the main thread here. Linux fork creates a new process
607 // which only copies the main thread.
608 LLDB_LOG(log, "exec received, stop tracking all but main thread")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "exec received, stop tracking all but main thread"
); } while (0)
;
609
610 for (auto i = m_threads.begin(); i != m_threads.end();) {
611 if ((*i)->GetID() == GetID())
612 i = m_threads.erase(i);
613 else
614 ++i;
615 }
616 assert(m_threads.size() == 1)((m_threads.size() == 1) ? static_cast<void> (0) : __assert_fail
("m_threads.size() == 1", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 616, __PRETTY_FUNCTION__))
;
617 auto *main_thread = static_cast<NativeThreadLinux *>(m_threads[0].get());
618
619 SetCurrentThreadID(main_thread->GetID());
620 main_thread->SetStoppedByExec();
621
622 // Tell coordinator about about the "new" (since exec) stopped main thread.
623 ThreadWasCreated(*main_thread);
624
625 // Let our delegate know we have just exec'd.
626 NotifyDidExec();
627
628 // Let the process know we're stopped.
629 StopRunningThreads(main_thread->GetID());
630
631 break;
632 }
633
634 case (SIGTRAP5 | (PTRACE_EVENT_EXIT << 8)): {
635 // The inferior process or one of its threads is about to exit. We don't
636 // want to do anything with the thread so we just resume it. In case we
637 // want to implement "break on thread exit" functionality, we would need to
638 // stop here.
639
640 unsigned long data = 0;
641 if (GetEventMessage(thread.GetID(), &data).Fail())
642 data = -1;
643
644 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
645 "received PTRACE_EVENT_EXIT, data = {0:x}, WIFEXITED={1}, "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
646 "WIFSIGNALED={2}, pid = {3}, main_thread = {4}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
647 data, WIFEXITED(data), WIFSIGNALED(data), thread.GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
648 is_main_thread)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
649
650
651 StateType state = thread.GetState();
652 if (!StateIsRunningState(state)) {
653 // Due to a kernel bug, we may sometimes get this stop after the inferior
654 // gets a SIGKILL. This confuses our state tracking logic in
655 // ResumeThread(), since normally, we should not be receiving any ptrace
656 // events while the inferior is stopped. This makes sure that the
657 // inferior is resumed and exits normally.
658 state = eStateRunning;
659 }
660 ResumeThread(thread, state, LLDB_INVALID_SIGNAL_NUMBER(2147483647));
661
662 break;
663 }
664
665 case 0:
666 case TRAP_TRACETRAP_TRACE: // We receive this on single stepping.
667 case TRAP_HWBKPT4: // We receive this on watchpoint hit
668 {
669 // If a watchpoint was hit, report it
670 uint32_t wp_index;
671 Status error = thread.GetRegisterContext().GetWatchpointHitIndex(
672 wp_index, (uintptr_t)info.si_addr_sifields._sigfault.si_addr);
673 if (error.Fail())
674 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received error while checking for watchpoint hits, pid = "
"{0}, error = {1}", thread.GetID(), error); } while (0)
675 "received error while checking for watchpoint hits, pid = "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received error while checking for watchpoint hits, pid = "
"{0}, error = {1}", thread.GetID(), error); } while (0)
676 "{0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received error while checking for watchpoint hits, pid = "
"{0}, error = {1}", thread.GetID(), error); } while (0)
677 thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received error while checking for watchpoint hits, pid = "
"{0}, error = {1}", thread.GetID(), error); } while (0)
;
678 if (wp_index != LLDB_INVALID_INDEX32(4294967295U)) {
679 MonitorWatchpoint(thread, wp_index);
680 break;
681 }
682
683 // If a breakpoint was hit, report it
684 uint32_t bp_index;
685 error = thread.GetRegisterContext().GetHardwareBreakHitIndex(
686 bp_index, (uintptr_t)info.si_addr_sifields._sigfault.si_addr);
687 if (error.Fail())
688 LLDB_LOG(log, "received error while checking for hardware "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
689 "breakpoint hits, pid = {0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
690 thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
691 if (bp_index != LLDB_INVALID_INDEX32(4294967295U)) {
692 MonitorBreakpoint(thread);
693 break;
694 }
695
696 // Otherwise, report step over
697 MonitorTrace(thread);
698 break;
699 }
700
701 case SI_KERNELSI_KERNEL:
702#if defined __mips__
703 // For mips there is no special signal for watchpoint So we check for
704 // watchpoint in kernel trap
705 {
706 // If a watchpoint was hit, report it
707 uint32_t wp_index;
708 Status error = thread.GetRegisterContext().GetWatchpointHitIndex(
709 wp_index, LLDB_INVALID_ADDRESS(18446744073709551615UL));
710 if (error.Fail())
711 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received error while checking for watchpoint hits, pid = "
"{0}, error = {1}", thread.GetID(), error); } while (0)
712 "received error while checking for watchpoint hits, pid = "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received error while checking for watchpoint hits, pid = "
"{0}, error = {1}", thread.GetID(), error); } while (0)
713 "{0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received error while checking for watchpoint hits, pid = "
"{0}, error = {1}", thread.GetID(), error); } while (0)
714 thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received error while checking for watchpoint hits, pid = "
"{0}, error = {1}", thread.GetID(), error); } while (0)
;
715 if (wp_index != LLDB_INVALID_INDEX32(4294967295U)) {
716 MonitorWatchpoint(thread, wp_index);
717 break;
718 }
719 }
720// NO BREAK
721#endif
722 case TRAP_BRKPTTRAP_BRKPT:
723 MonitorBreakpoint(thread);
724 break;
725
726 case SIGTRAP5:
727 case (SIGTRAP5 | 0x80):
728 LLDB_LOG(do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
729 log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
730 "received unknown SIGTRAP stop event ({0}, pid {1} tid {2}, resuming",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
731 info.si_code, GetID(), thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
732
733 // Ignore these signals until we know more about them.
734 ResumeThread(thread, thread.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647));
735 break;
736
737 default:
738 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
739 info.si_code, GetID(), thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
740 MonitorSignal(info, thread, false);
741 break;
742 }
743}
744
745void NativeProcessLinux::MonitorTrace(NativeThreadLinux &thread) {
746 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
747 LLDB_LOG(log, "received trace event, pid = {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received trace event, pid = {0}", thread.GetID()
); } while (0)
;
748
749 // This thread is currently stopped.
750 thread.SetStoppedByTrace();
751
752 StopRunningThreads(thread.GetID());
753}
754
755void NativeProcessLinux::MonitorBreakpoint(NativeThreadLinux &thread) {
756 Log *log(
757 GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS(1u << 1) | LIBLLDB_LOG_BREAKPOINTS(1u << 5)));
758 LLDB_LOG(log, "received breakpoint event, pid = {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received breakpoint event, pid = {0}", thread.GetID
()); } while (0)
;
759
760 // Mark the thread as stopped at breakpoint.
761 thread.SetStoppedByBreakpoint();
762 FixupBreakpointPCAsNeeded(thread);
763
764 if (m_threads_stepping_with_breakpoint.find(thread.GetID()) !=
765 m_threads_stepping_with_breakpoint.end())
766 thread.SetStoppedByTrace();
767
768 StopRunningThreads(thread.GetID());
769}
770
771void NativeProcessLinux::MonitorWatchpoint(NativeThreadLinux &thread,
772 uint32_t wp_index) {
773 Log *log(
774 GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS(1u << 1) | LIBLLDB_LOG_WATCHPOINTS(1u << 6)));
775 LLDB_LOG(log, "received watchpoint event, pid = {0}, wp_index = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received watchpoint event, pid = {0}, wp_index = {1}"
, thread.GetID(), wp_index); } while (0)
776 thread.GetID(), wp_index)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received watchpoint event, pid = {0}, wp_index = {1}"
, thread.GetID(), wp_index); } while (0)
;
777
778 // Mark the thread as stopped at watchpoint. The address is at
779 // (lldb::addr_t)info->si_addr if we need it.
780 thread.SetStoppedByWatchpoint(wp_index);
781
782 // We need to tell all other running threads before we notify the delegate
783 // about this stop.
784 StopRunningThreads(thread.GetID());
785}
786
787void NativeProcessLinux::MonitorSignal(const siginfo_t &info,
788 NativeThreadLinux &thread, bool exited) {
789 const int signo = info.si_signo;
790 const bool is_from_llgs = info.si_pid_sifields._kill.si_pid == getpid();
791
792 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
793
794 // POSIX says that process behaviour is undefined after it ignores a SIGFPE,
795 // SIGILL, SIGSEGV, or SIGBUS *unless* that signal was generated by a kill(2)
796 // or raise(3). Similarly for tgkill(2) on Linux.
797 //
798 // IOW, user generated signals never generate what we consider to be a
799 // "crash".
800 //
801 // Similarly, ACK signals generated by this monitor.
802
803 // Handle the signal.
804 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
805 "received signal {0} ({1}) with code {2}, (siginfo pid = {3}, "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
806 "waitpid pid = {4})",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
807 Host::GetSignalAsCString(signo), signo, info.si_code,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
808 thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
809
810 // Check for thread stop notification.
811 if (is_from_llgs && (info.si_code == SI_TKILLSI_TKILL) && (signo == SIGSTOP19)) {
812 // This is a tgkill()-based stop.
813 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1}, thread stopped", GetID(), thread
.GetID()); } while (0)
;
814
815 // Check that we're not already marked with a stop reason. Note this thread
816 // really shouldn't already be marked as stopped - if we were, that would
817 // imply that the kernel signaled us with the thread stopping which we
818 // handled and marked as stopped, and that, without an intervening resume,
819 // we received another stop. It is more likely that we are missing the
820 // marking of a run state somewhere if we find that the thread was marked
821 // as stopped.
822 const StateType thread_state = thread.GetState();
823 if (!StateIsStoppedState(thread_state, false)) {
824 // An inferior thread has stopped because of a SIGSTOP we have sent it.
825 // Generally, these are not important stops and we don't want to report
826 // them as they are just used to stop other threads when one thread (the
827 // one with the *real* stop reason) hits a breakpoint (watchpoint,
828 // etc...). However, in the case of an asynchronous Interrupt(), this
829 // *is* the real stop reason, so we leave the signal intact if this is
830 // the thread that was chosen as the triggering thread.
831 if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0) {
832 if (m_pending_notification_tid == thread.GetID())
833 thread.SetStoppedBySignal(SIGSTOP19, &info);
834 else
835 thread.SetStoppedWithNoReason();
836
837 SetCurrentThreadID(thread.GetID());
838 SignalIfAllThreadsStopped();
839 } else {
840 // We can end up here if stop was initiated by LLGS but by this time a
841 // thread stop has occurred - maybe initiated by another event.
842 Status error = ResumeThread(thread, thread.GetState(), 0);
843 if (error.Fail())
844 LLDB_LOG(log, "failed to resume thread {0}: {1}", thread.GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to resume thread {0}: {1}", thread.GetID(
), error); } while (0)
845 error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to resume thread {0}: {1}", thread.GetID(
), error); } while (0)
;
846 }
847 } else {
848 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
849 "pid {0} tid {1}, thread was already marked as a stopped "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
850 "state (state={2}), leaving stop signal as is",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
851 GetID(), thread.GetID(), thread_state)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
852 SignalIfAllThreadsStopped();
853 }
854
855 // Done handling.
856 return;
857 }
858
859 // Check if debugger should stop at this signal or just ignore it and resume
860 // the inferior.
861 if (m_signals_to_ignore.find(signo) != m_signals_to_ignore.end()) {
862 ResumeThread(thread, thread.GetState(), signo);
863 return;
864 }
865
866 // This thread is stopped.
867 LLDB_LOG(log, "received signal {0}", Host::GetSignalAsCString(signo))do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received signal {0}", Host::GetSignalAsCString(signo
)); } while (0)
;
868 thread.SetStoppedBySignal(signo, &info);
869
870 // Send a stop to the debugger after we get all other threads to stop.
871 StopRunningThreads(thread.GetID());
872}
873
874namespace {
875
876struct EmulatorBaton {
877 NativeProcessLinux &m_process;
878 NativeRegisterContext &m_reg_context;
879
880 // eRegisterKindDWARF -> RegsiterValue
881 std::unordered_map<uint32_t, RegisterValue> m_register_values;
882
883 EmulatorBaton(NativeProcessLinux &process, NativeRegisterContext &reg_context)
884 : m_process(process), m_reg_context(reg_context) {}
885};
886
887} // anonymous namespace
888
889static size_t ReadMemoryCallback(EmulateInstruction *instruction, void *baton,
890 const EmulateInstruction::Context &context,
891 lldb::addr_t addr, void *dst, size_t length) {
892 EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
893
894 size_t bytes_read;
895 emulator_baton->m_process.ReadMemory(addr, dst, length, bytes_read);
896 return bytes_read;
897}
898
899static bool ReadRegisterCallback(EmulateInstruction *instruction, void *baton,
900 const RegisterInfo *reg_info,
901 RegisterValue &reg_value) {
902 EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
903
904 auto it = emulator_baton->m_register_values.find(
905 reg_info->kinds[eRegisterKindDWARF]);
906 if (it != emulator_baton->m_register_values.end()) {
907 reg_value = it->second;
908 return true;
909 }
910
911 // The emulator only fill in the dwarf regsiter numbers (and in some case the
912 // generic register numbers). Get the full register info from the register
913 // context based on the dwarf register numbers.
914 const RegisterInfo *full_reg_info =
915 emulator_baton->m_reg_context.GetRegisterInfo(
916 eRegisterKindDWARF, reg_info->kinds[eRegisterKindDWARF]);
917
918 Status error =
919 emulator_baton->m_reg_context.ReadRegister(full_reg_info, reg_value);
920 if (error.Success())
921 return true;
922
923 return false;
924}
925
926static bool WriteRegisterCallback(EmulateInstruction *instruction, void *baton,
927 const EmulateInstruction::Context &context,
928 const RegisterInfo *reg_info,
929 const RegisterValue &reg_value) {
930 EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
931 emulator_baton->m_register_values[reg_info->kinds[eRegisterKindDWARF]] =
932 reg_value;
933 return true;
934}
935
936static size_t WriteMemoryCallback(EmulateInstruction *instruction, void *baton,
937 const EmulateInstruction::Context &context,
938 lldb::addr_t addr, const void *dst,
939 size_t length) {
940 return length;
941}
942
943static lldb::addr_t ReadFlags(NativeRegisterContext &regsiter_context) {
944 const RegisterInfo *flags_info = regsiter_context.GetRegisterInfo(
945 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS4);
946 return regsiter_context.ReadRegisterAsUnsigned(flags_info,
947 LLDB_INVALID_ADDRESS(18446744073709551615UL));
948}
949
950Status
951NativeProcessLinux::SetupSoftwareSingleStepping(NativeThreadLinux &thread) {
952 Status error;
953 NativeRegisterContext& register_context = thread.GetRegisterContext();
954
955 std::unique_ptr<EmulateInstruction> emulator_ap(
956 EmulateInstruction::FindPlugin(m_arch, eInstructionTypePCModifying,
957 nullptr));
958
959 if (emulator_ap == nullptr)
960 return Status("Instruction emulator not found!");
961
962 EmulatorBaton baton(*this, register_context);
963 emulator_ap->SetBaton(&baton);
964 emulator_ap->SetReadMemCallback(&ReadMemoryCallback);
965 emulator_ap->SetReadRegCallback(&ReadRegisterCallback);
966 emulator_ap->SetWriteMemCallback(&WriteMemoryCallback);
967 emulator_ap->SetWriteRegCallback(&WriteRegisterCallback);
968
969 if (!emulator_ap->ReadInstruction())
970 return Status("Read instruction failed!");
971
972 bool emulation_result =
973 emulator_ap->EvaluateInstruction(eEmulateInstructionOptionAutoAdvancePC);
974
975 const RegisterInfo *reg_info_pc = register_context.GetRegisterInfo(
976 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC0);
977 const RegisterInfo *reg_info_flags = register_context.GetRegisterInfo(
978 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS4);
979
980 auto pc_it =
981 baton.m_register_values.find(reg_info_pc->kinds[eRegisterKindDWARF]);
982 auto flags_it =
983 baton.m_register_values.find(reg_info_flags->kinds[eRegisterKindDWARF]);
984
985 lldb::addr_t next_pc;
986 lldb::addr_t next_flags;
987 if (emulation_result) {
988 assert(pc_it != baton.m_register_values.end() &&((pc_it != baton.m_register_values.end() && "Emulation was successfull but PC wasn't updated"
) ? static_cast<void> (0) : __assert_fail ("pc_it != baton.m_register_values.end() && \"Emulation was successfull but PC wasn't updated\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 989, __PRETTY_FUNCTION__))
989 "Emulation was successfull but PC wasn't updated")((pc_it != baton.m_register_values.end() && "Emulation was successfull but PC wasn't updated"
) ? static_cast<void> (0) : __assert_fail ("pc_it != baton.m_register_values.end() && \"Emulation was successfull but PC wasn't updated\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 989, __PRETTY_FUNCTION__))
;
990 next_pc = pc_it->second.GetAsUInt64();
991
992 if (flags_it != baton.m_register_values.end())
993 next_flags = flags_it->second.GetAsUInt64();
994 else
995 next_flags = ReadFlags(register_context);
996 } else if (pc_it == baton.m_register_values.end()) {
997 // Emulate instruction failed and it haven't changed PC. Advance PC with
998 // the size of the current opcode because the emulation of all
999 // PC modifying instruction should be successful. The failure most
1000 // likely caused by a not supported instruction which don't modify PC.
1001 next_pc = register_context.GetPC() + emulator_ap->GetOpcode().GetByteSize();
1002 next_flags = ReadFlags(register_context);
1003 } else {
1004 // The instruction emulation failed after it modified the PC. It is an
1005 // unknown error where we can't continue because the next instruction is
1006 // modifying the PC but we don't know how.
1007 return Status("Instruction emulation failed unexpectedly.");
1008 }
1009
1010 if (m_arch.GetMachine() == llvm::Triple::arm) {
1011 if (next_flags & 0x20) {
1012 // Thumb mode
1013 error = SetSoftwareBreakpoint(next_pc, 2);
1014 } else {
1015 // Arm mode
1016 error = SetSoftwareBreakpoint(next_pc, 4);
1017 }
1018 } else if (m_arch.GetMachine() == llvm::Triple::mips64 ||
1019 m_arch.GetMachine() == llvm::Triple::mips64el ||
1020 m_arch.GetMachine() == llvm::Triple::mips ||
1021 m_arch.GetMachine() == llvm::Triple::mipsel ||
1022 m_arch.GetMachine() == llvm::Triple::ppc64le)
1023 error = SetSoftwareBreakpoint(next_pc, 4);
1024 else {
1025 // No size hint is given for the next breakpoint
1026 error = SetSoftwareBreakpoint(next_pc, 0);
1027 }
1028
1029 // If setting the breakpoint fails because next_pc is out of the address
1030 // space, ignore it and let the debugee segfault.
1031 if (error.GetError() == EIO5 || error.GetError() == EFAULT14) {
1032 return Status();
1033 } else if (error.Fail())
1034 return error;
1035
1036 m_threads_stepping_with_breakpoint.insert({thread.GetID(), next_pc});
1037
1038 return Status();
1039}
1040
1041bool NativeProcessLinux::SupportHardwareSingleStepping() const {
1042 if (m_arch.GetMachine() == llvm::Triple::arm ||
1043 m_arch.GetMachine() == llvm::Triple::mips64 ||
1044 m_arch.GetMachine() == llvm::Triple::mips64el ||
1045 m_arch.GetMachine() == llvm::Triple::mips ||
1046 m_arch.GetMachine() == llvm::Triple::mipsel)
1047 return false;
1048 return true;
1049}
1050
1051Status NativeProcessLinux::Resume(const ResumeActionList &resume_actions) {
1052 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1053 LLDB_LOG(log, "pid {0}", GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0}", GetID()); } while (0)
;
1054
1055 bool software_single_step = !SupportHardwareSingleStepping();
1056
1057 if (software_single_step) {
1058 for (const auto &thread : m_threads) {
1059 assert(thread && "thread list should not contain NULL threads")((thread && "thread list should not contain NULL threads"
) ? static_cast<void> (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1059, __PRETTY_FUNCTION__))
;
1060
1061 const ResumeAction *const action =
1062 resume_actions.GetActionForThread(thread->GetID(), true);
1063 if (action == nullptr)
1064 continue;
1065
1066 if (action->state == eStateStepping) {
1067 Status error = SetupSoftwareSingleStepping(
1068 static_cast<NativeThreadLinux &>(*thread));
1069 if (error.Fail())
1070 return error;
1071 }
1072 }
1073 }
1074
1075 for (const auto &thread : m_threads) {
1076 assert(thread && "thread list should not contain NULL threads")((thread && "thread list should not contain NULL threads"
) ? static_cast<void> (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1076, __PRETTY_FUNCTION__))
;
1077
1078 const ResumeAction *const action =
1079 resume_actions.GetActionForThread(thread->GetID(), true);
1080
1081 if (action == nullptr) {
1082 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "no action specified for pid {0} tid {1}", GetID(
), thread->GetID()); } while (0)
1083 thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "no action specified for pid {0} tid {1}", GetID(
), thread->GetID()); } while (0)
;
1084 continue;
1085 }
1086
1087 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1088 action->state, GetID(), thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
1089
1090 switch (action->state) {
1091 case eStateRunning:
1092 case eStateStepping: {
1093 // Run the thread, possibly feeding it the signal.
1094 const int signo = action->signal;
1095 ResumeThread(static_cast<NativeThreadLinux &>(*thread), action->state,
1096 signo);
1097 break;
1098 }
1099
1100 case eStateSuspended:
1101 case eStateStopped:
1102 llvm_unreachable("Unexpected state")::llvm::llvm_unreachable_internal("Unexpected state", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1102)
;
1103
1104 default:
1105 return Status("NativeProcessLinux::%s (): unexpected state %s specified "
1106 "for pid %" PRIu64"l" "u" ", tid %" PRIu64"l" "u",
1107 __FUNCTION__, StateAsCString(action->state), GetID(),
1108 thread->GetID());
1109 }
1110 }
1111
1112 return Status();
1113}
1114
1115Status NativeProcessLinux::Halt() {
1116 Status error;
1117
1118 if (kill(GetID(), SIGSTOP19) != 0)
1119 error.SetErrorToErrno();
1120
1121 return error;
1122}
1123
1124Status NativeProcessLinux::Detach() {
1125 Status error;
1126
1127 // Stop monitoring the inferior.
1128 m_sigchld_handle.reset();
1129
1130 // Tell ptrace to detach from the process.
1131 if (GetID() == LLDB_INVALID_PROCESS_ID0)
1132 return error;
1133
1134 for (const auto &thread : m_threads) {
1135 Status e = Detach(thread->GetID());
1136 if (e.Fail())
1137 error =
1138 e; // Save the error, but still attempt to detach from other threads.
1139 }
1140
1141 m_processor_trace_monitor.clear();
1142 m_pt_proces_trace_id = LLDB_INVALID_UID(18446744073709551615UL);
1143
1144 return error;
1145}
1146
1147Status NativeProcessLinux::Signal(int signo) {
1148 Status error;
1149
1150 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1151 LLDB_LOG(log, "sending signal {0} ({1}) to pid {1}", signo,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "sending signal {0} ({1}) to pid {1}", signo, Host
::GetSignalAsCString(signo), GetID()); } while (0)
1152 Host::GetSignalAsCString(signo), GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "sending signal {0} ({1}) to pid {1}", signo, Host
::GetSignalAsCString(signo), GetID()); } while (0)
;
1153
1154 if (kill(GetID(), signo))
1155 error.SetErrorToErrno();
1156
1157 return error;
1158}
1159
1160Status NativeProcessLinux::Interrupt() {
1161 // Pick a running thread (or if none, a not-dead stopped thread) as the
1162 // chosen thread that will be the stop-reason thread.
1163 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1164
1165 NativeThreadProtocol *running_thread = nullptr;
1166 NativeThreadProtocol *stopped_thread = nullptr;
1167
1168 LLDB_LOG(log, "selecting running thread for interrupt target")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "selecting running thread for interrupt target");
} while (0)
;
1169 for (const auto &thread : m_threads) {
1170 // If we have a running or stepping thread, we'll call that the target of
1171 // the interrupt.
1172 const auto thread_state = thread->GetState();
1173 if (thread_state == eStateRunning || thread_state == eStateStepping) {
1174 running_thread = thread.get();
1175 break;
1176 } else if (!stopped_thread && StateIsStoppedState(thread_state, true)) {
1177 // Remember the first non-dead stopped thread. We'll use that as a
1178 // backup if there are no running threads.
1179 stopped_thread = thread.get();
1180 }
1181 }
1182
1183 if (!running_thread && !stopped_thread) {
1184 Status error("found no running/stepping or live stopped threads as target "
1185 "for interrupt");
1186 LLDB_LOG(log, "skipping due to error: {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "skipping due to error: {0}", error); } while (0)
;
1187
1188 return error;
1189 }
1190
1191 NativeThreadProtocol *deferred_signal_thread =
1192 running_thread ? running_thread : stopped_thread;
1193
1194 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1195 running_thread ? "running" : "stopped",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1196 deferred_signal_thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
1197
1198 StopRunningThreads(deferred_signal_thread->GetID());
1199
1200 return Status();
1201}
1202
1203Status NativeProcessLinux::Kill() {
1204 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1205 LLDB_LOG(log, "pid {0}", GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0}", GetID()); } while (0)
;
1206
1207 Status error;
1208
1209 switch (m_state) {
1210 case StateType::eStateInvalid:
1211 case StateType::eStateExited:
1212 case StateType::eStateCrashed:
1213 case StateType::eStateDetached:
1214 case StateType::eStateUnloaded:
1215 // Nothing to do - the process is already dead.
1216 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "ignored for PID {0} due to current state: {1}", GetID
(), m_state); } while (0)
1217 m_state)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "ignored for PID {0} due to current state: {1}", GetID
(), m_state); } while (0)
;
1218 return error;
1219
1220 case StateType::eStateConnected:
1221 case StateType::eStateAttaching:
1222 case StateType::eStateLaunching:
1223 case StateType::eStateStopped:
1224 case StateType::eStateRunning:
1225 case StateType::eStateStepping:
1226 case StateType::eStateSuspended:
1227 // We can try to kill a process in these states.
1228 break;
1229 }
1230
1231 if (kill(GetID(), SIGKILL9) != 0) {
1232 error.SetErrorToErrno();
1233 return error;
1234 }
1235
1236 return error;
1237}
1238
1239static Status
1240ParseMemoryRegionInfoFromProcMapsLine(llvm::StringRef &maps_line,
1241 MemoryRegionInfo &memory_region_info) {
1242 memory_region_info.Clear();
1243
1244 StringExtractor line_extractor(maps_line);
1245
1246 // Format: {address_start_hex}-{address_end_hex} perms offset dev inode
1247 // pathname perms: rwxp (letter is present if set, '-' if not, final
1248 // character is p=private, s=shared).
1249
1250 // Parse out the starting address
1251 lldb::addr_t start_address = line_extractor.GetHexMaxU64(false, 0);
1252
1253 // Parse out hyphen separating start and end address from range.
1254 if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != '-'))
1255 return Status(
1256 "malformed /proc/{pid}/maps entry, missing dash between address range");
1257
1258 // Parse out the ending address
1259 lldb::addr_t end_address = line_extractor.GetHexMaxU64(false, start_address);
1260
1261 // Parse out the space after the address.
1262 if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != ' '))
1263 return Status(
1264 "malformed /proc/{pid}/maps entry, missing space after range");
1265
1266 // Save the range.
1267 memory_region_info.GetRange().SetRangeBase(start_address);
1268 memory_region_info.GetRange().SetRangeEnd(end_address);
1269
1270 // Any memory region in /proc/{pid}/maps is by definition mapped into the
1271 // process.
1272 memory_region_info.SetMapped(MemoryRegionInfo::OptionalBool::eYes);
1273
1274 // Parse out each permission entry.
1275 if (line_extractor.GetBytesLeft() < 4)
1276 return Status("malformed /proc/{pid}/maps entry, missing some portion of "
1277 "permissions");
1278
1279 // Handle read permission.
1280 const char read_perm_char = line_extractor.GetChar();
1281 if (read_perm_char == 'r')
1282 memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eYes);
1283 else if (read_perm_char == '-')
1284 memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
1285 else
1286 return Status("unexpected /proc/{pid}/maps read permission char");
1287
1288 // Handle write permission.
1289 const char write_perm_char = line_extractor.GetChar();
1290 if (write_perm_char == 'w')
1291 memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eYes);
1292 else if (write_perm_char == '-')
1293 memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
1294 else
1295 return Status("unexpected /proc/{pid}/maps write permission char");
1296
1297 // Handle execute permission.
1298 const char exec_perm_char = line_extractor.GetChar();
1299 if (exec_perm_char == 'x')
1300 memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eYes);
1301 else if (exec_perm_char == '-')
1302 memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
1303 else
1304 return Status("unexpected /proc/{pid}/maps exec permission char");
1305
1306 line_extractor.GetChar(); // Read the private bit
1307 line_extractor.SkipSpaces(); // Skip the separator
1308 line_extractor.GetHexMaxU64(false, 0); // Read the offset
1309 line_extractor.GetHexMaxU64(false, 0); // Read the major device number
1310 line_extractor.GetChar(); // Read the device id separator
1311 line_extractor.GetHexMaxU64(false, 0); // Read the major device number
1312 line_extractor.SkipSpaces(); // Skip the separator
1313 line_extractor.GetU64(0, 10); // Read the inode number
1314
1315 line_extractor.SkipSpaces();
1316 const char *name = line_extractor.Peek();
1317 if (name)
1318 memory_region_info.SetName(name);
1319
1320 return Status();
1321}
1322
1323Status NativeProcessLinux::GetMemoryRegionInfo(lldb::addr_t load_addr,
1324 MemoryRegionInfo &range_info) {
1325 // FIXME review that the final memory region returned extends to the end of
1326 // the virtual address space,
1327 // with no perms if it is not mapped.
1328
1329 // Use an approach that reads memory regions from /proc/{pid}/maps. Assume
1330 // proc maps entries are in ascending order.
1331 // FIXME assert if we find differently.
1332
1333 if (m_supports_mem_region == LazyBool::eLazyBoolNo) {
1334 // We're done.
1335 return Status("unsupported");
1336 }
1337
1338 Status error = PopulateMemoryRegionCache();
1339 if (error.Fail()) {
1340 return error;
1341 }
1342
1343 lldb::addr_t prev_base_address = 0;
1344
1345 // FIXME start by finding the last region that is <= target address using
1346 // binary search. Data is sorted.
1347 // There can be a ton of regions on pthreads apps with lots of threads.
1348 for (auto it = m_mem_region_cache.begin(); it != m_mem_region_cache.end();
1349 ++it) {
1350 MemoryRegionInfo &proc_entry_info = it->first;
1351
1352 // Sanity check assumption that /proc/{pid}/maps entries are ascending.
1353 assert((proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) &&(((proc_entry_info.GetRange().GetRangeBase() >= prev_base_address
) && "descending /proc/pid/maps entries detected, unexpected"
) ? static_cast<void> (0) : __assert_fail ("(proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) && \"descending /proc/pid/maps entries detected, unexpected\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1354, __PRETTY_FUNCTION__))
1354 "descending /proc/pid/maps entries detected, unexpected")(((proc_entry_info.GetRange().GetRangeBase() >= prev_base_address
) && "descending /proc/pid/maps entries detected, unexpected"
) ? static_cast<void> (0) : __assert_fail ("(proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) && \"descending /proc/pid/maps entries detected, unexpected\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1354, __PRETTY_FUNCTION__))
;
1355 prev_base_address = proc_entry_info.GetRange().GetRangeBase();
1356 UNUSED_IF_ASSERT_DISABLED(prev_base_address)((void)(prev_base_address));
1357
1358 // If the target address comes before this entry, indicate distance to next
1359 // region.
1360 if (load_addr < proc_entry_info.GetRange().GetRangeBase()) {
1361 range_info.GetRange().SetRangeBase(load_addr);
1362 range_info.GetRange().SetByteSize(
1363 proc_entry_info.GetRange().GetRangeBase() - load_addr);
1364 range_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
1365 range_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
1366 range_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
1367 range_info.SetMapped(MemoryRegionInfo::OptionalBool::eNo);
1368
1369 return error;
1370 } else if (proc_entry_info.GetRange().Contains(load_addr)) {
1371 // The target address is within the memory region we're processing here.
1372 range_info = proc_entry_info;
1373 return error;
1374 }
1375
1376 // The target memory address comes somewhere after the region we just
1377 // parsed.
1378 }
1379
1380 // If we made it here, we didn't find an entry that contained the given
1381 // address. Return the load_addr as start and the amount of bytes betwwen
1382 // load address and the end of the memory as size.
1383 range_info.GetRange().SetRangeBase(load_addr);
1384 range_info.GetRange().SetRangeEnd(LLDB_INVALID_ADDRESS(18446744073709551615UL));
1385 range_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
1386 range_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
1387 range_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
1388 range_info.SetMapped(MemoryRegionInfo::OptionalBool::eNo);
1389 return error;
1390}
1391
1392Status NativeProcessLinux::PopulateMemoryRegionCache() {
1393 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1394
1395 // If our cache is empty, pull the latest. There should always be at least
1396 // one memory region if memory region handling is supported.
1397 if (!m_mem_region_cache.empty()) {
1398 LLDB_LOG(log, "reusing {0} cached memory region entries",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "reusing {0} cached memory region entries", m_mem_region_cache
.size()); } while (0)
1399 m_mem_region_cache.size())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "reusing {0} cached memory region entries", m_mem_region_cache
.size()); } while (0)
;
1400 return Status();
1401 }
1402
1403 auto BufferOrError = getProcFile(GetID(), "maps");
1404 if (!BufferOrError) {
1405 m_supports_mem_region = LazyBool::eLazyBoolNo;
1406 return BufferOrError.getError();
1407 }
1408 StringRef Rest = BufferOrError.get()->getBuffer();
1409 while (! Rest.empty()) {
1410 StringRef Line;
1411 std::tie(Line, Rest) = Rest.split('\n');
1412 MemoryRegionInfo info;
1413 const Status parse_error =
1414 ParseMemoryRegionInfoFromProcMapsLine(Line, info);
1415 if (parse_error.Fail()) {
1416 LLDB_LOG(log, "failed to parse proc maps line '{0}': {1}", Line,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to parse proc maps line '{0}': {1}", Line
, parse_error); } while (0)
1417 parse_error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to parse proc maps line '{0}': {1}", Line
, parse_error); } while (0)
;
1418 m_supports_mem_region = LazyBool::eLazyBoolNo;
1419 return parse_error;
1420 }
1421 m_mem_region_cache.emplace_back(
1422 info, FileSpec(info.GetName().GetCString(), true));
1423 }
1424
1425 if (m_mem_region_cache.empty()) {
1426 // No entries after attempting to read them. This shouldn't happen if
1427 // /proc/{pid}/maps is supported. Assume we don't support map entries via
1428 // procfs.
1429 m_supports_mem_region = LazyBool::eLazyBoolNo;
1430 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1431 "failed to find any procfs maps entries, assuming no support "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1432 "for memory region metadata retrieval")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
1433 return Status("not supported");
1434 }
1435
1436 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1437 m_mem_region_cache.size(), GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
1438
1439 // We support memory retrieval, remember that.
1440 m_supports_mem_region = LazyBool::eLazyBoolYes;
1441 return Status();
1442}
1443
1444void NativeProcessLinux::DoStopIDBumped(uint32_t newBumpId) {
1445 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1446 LLDB_LOG(log, "newBumpId={0}", newBumpId)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "newBumpId={0}", newBumpId); } while (0)
;
1447 LLDB_LOG(log, "clearing {0} entries from memory region cache",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "clearing {0} entries from memory region cache", m_mem_region_cache
.size()); } while (0)
1448 m_mem_region_cache.size())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "clearing {0} entries from memory region cache", m_mem_region_cache
.size()); } while (0)
;
1449 m_mem_region_cache.clear();
1450}
1451
1452Status NativeProcessLinux::AllocateMemory(size_t size, uint32_t permissions,
1453 lldb::addr_t &addr) {
1454// FIXME implementing this requires the equivalent of
1455// InferiorCallPOSIX::InferiorCallMmap, which depends on functional ThreadPlans
1456// working with Native*Protocol.
1457#if 1
1458 return Status("not implemented yet");
1459#else
1460 addr = LLDB_INVALID_ADDRESS(18446744073709551615UL);
1461
1462 unsigned prot = 0;
1463 if (permissions & lldb::ePermissionsReadable)
1464 prot |= eMmapProtRead;
1465 if (permissions & lldb::ePermissionsWritable)
1466 prot |= eMmapProtWrite;
1467 if (permissions & lldb::ePermissionsExecutable)
1468 prot |= eMmapProtExec;
1469
1470 // TODO implement this directly in NativeProcessLinux
1471 // (and lift to NativeProcessPOSIX if/when that class is refactored out).
1472 if (InferiorCallMmap(this, addr, 0, size, prot,
1473 eMmapFlagsAnon | eMmapFlagsPrivate, -1, 0)) {
1474 m_addr_to_mmap_size[addr] = size;
1475 return Status();
1476 } else {
1477 addr = LLDB_INVALID_ADDRESS(18446744073709551615UL);
1478 return Status("unable to allocate %" PRIu64"l" "u"
1479 " bytes of memory with permissions %s",
1480 size, GetPermissionsAsCString(permissions));
1481 }
1482#endif
1483}
1484
1485Status NativeProcessLinux::DeallocateMemory(lldb::addr_t addr) {
1486 // FIXME see comments in AllocateMemory - required lower-level
1487 // bits not in place yet (ThreadPlans)
1488 return Status("not implemented");
1489}
1490
1491lldb::addr_t NativeProcessLinux::GetSharedLibraryInfoAddress() {
1492 // punt on this for now
1493 return LLDB_INVALID_ADDRESS(18446744073709551615UL);
1494}
1495
1496size_t NativeProcessLinux::UpdateThreads() {
1497 // The NativeProcessLinux monitoring threads are always up to date with
1498 // respect to thread state and they keep the thread list populated properly.
1499 // All this method needs to do is return the thread count.
1500 return m_threads.size();
1501}
1502
1503Status NativeProcessLinux::SetBreakpoint(lldb::addr_t addr, uint32_t size,
1504 bool hardware) {
1505 if (hardware)
1506 return SetHardwareBreakpoint(addr, size);
1507 else
1508 return SetSoftwareBreakpoint(addr, size);
1509}
1510
1511Status NativeProcessLinux::RemoveBreakpoint(lldb::addr_t addr, bool hardware) {
1512 if (hardware)
1513 return RemoveHardwareBreakpoint(addr);
1514 else
1515 return NativeProcessProtocol::RemoveBreakpoint(addr);
1516}
1517
1518llvm::Expected<llvm::ArrayRef<uint8_t>>
1519NativeProcessLinux::GetSoftwareBreakpointTrapOpcode(size_t size_hint) {
1520 // The ARM reference recommends the use of 0xe7fddefe and 0xdefe but the
1521 // linux kernel does otherwise.
1522 static const uint8_t g_arm_opcode[] = {0xf0, 0x01, 0xf0, 0xe7};
1523 static const uint8_t g_thumb_opcode[] = {0x01, 0xde};
1524
1525 switch (GetArchitecture().GetMachine()) {
1526 case llvm::Triple::arm:
1527 switch (size_hint) {
1528 case 2:
1529 return llvm::makeArrayRef(g_thumb_opcode);
1530 case 4:
1531 return llvm::makeArrayRef(g_arm_opcode);
1532 default:
1533 return llvm::createStringError(llvm::inconvertibleErrorCode(),
1534 "Unrecognised trap opcode size hint!");
1535 }
1536 default:
1537 return NativeProcessProtocol::GetSoftwareBreakpointTrapOpcode(size_hint);
1538 }
1539}
1540
1541Status NativeProcessLinux::ReadMemory(lldb::addr_t addr, void *buf, size_t size,
1542 size_t &bytes_read) {
1543 if (ProcessVmReadvSupported()) {
1544 // The process_vm_readv path is about 50 times faster than ptrace api. We
1545 // want to use this syscall if it is supported.
1546
1547 const ::pid_t pid = GetID();
1548
1549 struct iovec local_iov, remote_iov;
1550 local_iov.iov_base = buf;
1551 local_iov.iov_len = size;
1552 remote_iov.iov_base = reinterpret_cast<void *>(addr);
1553 remote_iov.iov_len = size;
1554
1555 bytes_read = process_vm_readv(pid, &local_iov, 1, &remote_iov, 1, 0);
1556 const bool success = bytes_read == size;
1557
1558 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1559 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1560 "using process_vm_readv to read {0} bytes from inferior "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1561 "address {1:x}: {2}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1562 size, addr, success ? "Success" : llvm::sys::StrError(errno))do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
1563
1564 if (success)
1565 return Status();
1566 // else the call failed for some reason, let's retry the read using ptrace
1567 // api.
1568 }
1569
1570 unsigned char *dst = static_cast<unsigned char *>(buf);
1571 size_t remainder;
1572 long data;
1573
1574 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_MEMORY(1u << 4)));
1575 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "addr = {0}, buf = {1}, size = {2}", addr, buf, size
); } while (0)
;
1576
1577 for (bytes_read = 0; bytes_read < size; bytes_read += remainder) {
1578 Status error = NativeProcessLinux::PtraceWrapper(
1579 PTRACE_PEEKDATA, GetID(), (void *)addr, nullptr, 0, &data);
1580 if (error.Fail())
1581 return error;
1582
1583 remainder = size - bytes_read;
1584 remainder = remainder > k_ptrace_word_size ? k_ptrace_word_size : remainder;
1585
1586 // Copy the data into our buffer
1587 memcpy(dst, &data, remainder);
1588
1589 LLDB_LOG(log, "[{0:x}]:{1:x}", addr, data)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "[{0:x}]:{1:x}", addr, data); } while (0)
;
1590 addr += k_ptrace_word_size;
1591 dst += k_ptrace_word_size;
1592 }
1593 return Status();
1594}
1595
1596Status NativeProcessLinux::WriteMemory(lldb::addr_t addr, const void *buf,
1597 size_t size, size_t &bytes_written) {
1598 const unsigned char *src = static_cast<const unsigned char *>(buf);
1599 size_t remainder;
1600 Status error;
1601
1602 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_MEMORY(1u << 4)));
1603 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "addr = {0}, buf = {1}, size = {2}", addr, buf, size
); } while (0)
;
1604
1605 for (bytes_written = 0; bytes_written < size; bytes_written += remainder) {
1606 remainder = size - bytes_written;
1607 remainder = remainder > k_ptrace_word_size ? k_ptrace_word_size : remainder;
1608
1609 if (remainder == k_ptrace_word_size) {
1610 unsigned long data = 0;
1611 memcpy(&data, src, k_ptrace_word_size);
1612
1613 LLDB_LOG(log, "[{0:x}]:{1:x}", addr, data)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "[{0:x}]:{1:x}", addr, data); } while (0)
;
1614 error = NativeProcessLinux::PtraceWrapper(PTRACE_POKEDATA, GetID(),
1615 (void *)addr, (void *)data);
1616 if (error.Fail())
1617 return error;
1618 } else {
1619 unsigned char buff[8];
1620 size_t bytes_read;
1621 error = ReadMemory(addr, buff, k_ptrace_word_size, bytes_read);
1622 if (error.Fail())
1623 return error;
1624
1625 memcpy(buff, src, remainder);
1626
1627 size_t bytes_written_rec;
1628 error = WriteMemory(addr, buff, k_ptrace_word_size, bytes_written_rec);
1629 if (error.Fail())
1630 return error;
1631
1632 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "[{0:x}]:{1:x} ({2:x})", addr, *(const unsigned long
*)src, *(unsigned long *)buff); } while (0)
1633 *(unsigned long *)buff)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "[{0:x}]:{1:x} ({2:x})", addr, *(const unsigned long
*)src, *(unsigned long *)buff); } while (0)
;
1634 }
1635
1636 addr += k_ptrace_word_size;
1637 src += k_ptrace_word_size;
1638 }
1639 return error;
1640}
1641
1642Status NativeProcessLinux::GetSignalInfo(lldb::tid_t tid, void *siginfo) {
1643 return PtraceWrapper(PTRACE_GETSIGINFO, tid, nullptr, siginfo);
1644}
1645
1646Status NativeProcessLinux::GetEventMessage(lldb::tid_t tid,
1647 unsigned long *message) {
1648 return PtraceWrapper(PTRACE_GETEVENTMSG, tid, nullptr, message);
1649}
1650
1651Status NativeProcessLinux::Detach(lldb::tid_t tid) {
1652 if (tid == LLDB_INVALID_THREAD_ID0)
1653 return Status();
1654
1655 return PtraceWrapper(PTRACE_DETACH, tid);
1656}
1657
1658bool NativeProcessLinux::HasThreadNoLock(lldb::tid_t thread_id) {
1659 for (const auto &thread : m_threads) {
1660 assert(thread && "thread list should not contain NULL threads")((thread && "thread list should not contain NULL threads"
) ? static_cast<void> (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1660, __PRETTY_FUNCTION__))
;
1661 if (thread->GetID() == thread_id) {
1662 // We have this thread.
1663 return true;
1664 }
1665 }
1666
1667 // We don't have this thread.
1668 return false;
1669}
1670
1671bool NativeProcessLinux::StopTrackingThread(lldb::tid_t thread_id) {
1672 Log *const log = ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2));
1673 LLDB_LOG(log, "tid: {0})", thread_id)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "tid: {0})", thread_id); } while (0)
;
1674
1675 bool found = false;
1676 for (auto it = m_threads.begin(); it != m_threads.end(); ++it) {
1677 if (*it && ((*it)->GetID() == thread_id)) {
1678 m_threads.erase(it);
1679 found = true;
1680 break;
1681 }
1682 }
1683
1684 if (found)
1685 StopTracingForThread(thread_id);
1686 SignalIfAllThreadsStopped();
1687 return found;
1688}
1689
1690NativeThreadLinux &NativeProcessLinux::AddThread(lldb::tid_t thread_id) {
1691 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2)));
1692 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} adding thread with tid {1}", GetID(), thread_id
); } while (0)
;
1693
1694 assert(!HasThreadNoLock(thread_id) &&((!HasThreadNoLock(thread_id) && "attempted to add a thread by id that already exists"
) ? static_cast<void> (0) : __assert_fail ("!HasThreadNoLock(thread_id) && \"attempted to add a thread by id that already exists\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1695, __PRETTY_FUNCTION__))
1695 "attempted to add a thread by id that already exists")((!HasThreadNoLock(thread_id) && "attempted to add a thread by id that already exists"
) ? static_cast<void> (0) : __assert_fail ("!HasThreadNoLock(thread_id) && \"attempted to add a thread by id that already exists\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1695, __PRETTY_FUNCTION__))
;
1696
1697 // If this is the first thread, save it as the current thread
1698 if (m_threads.empty())
1699 SetCurrentThreadID(thread_id);
1700
1701 m_threads.push_back(llvm::make_unique<NativeThreadLinux>(*this, thread_id));
1702
1703 if (m_pt_proces_trace_id != LLDB_INVALID_UID(18446744073709551615UL)) {
1704 auto traceMonitor = ProcessorTraceMonitor::Create(
1705 GetID(), thread_id, m_pt_process_trace_config, true);
1706 if (traceMonitor) {
1707 m_pt_traced_thread_group.insert(thread_id);
1708 m_processor_trace_monitor.insert(
1709 std::make_pair(thread_id, std::move(*traceMonitor)));
1710 } else {
1711 LLDB_LOG(log, "failed to start trace on thread {0}", thread_id)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to start trace on thread {0}", thread_id)
; } while (0)
;
1712 Status error(traceMonitor.takeError());
1713 LLDB_LOG(log, "error {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "error {0}", error); } while (0)
;
1714 }
1715 }
1716
1717 return static_cast<NativeThreadLinux &>(*m_threads.back());
1718}
1719
1720Status NativeProcessLinux::GetLoadedModuleFileSpec(const char *module_path,
1721 FileSpec &file_spec) {
1722 Status error = PopulateMemoryRegionCache();
1723 if (error.Fail())
1724 return error;
1725
1726 FileSpec module_file_spec(module_path, true);
1727
1728 file_spec.Clear();
1729 for (const auto &it : m_mem_region_cache) {
1730 if (it.second.GetFilename() == module_file_spec.GetFilename()) {
1731 file_spec = it.second;
1732 return Status();
1733 }
1734 }
1735 return Status("Module file (%s) not found in /proc/%" PRIu64"l" "u" "/maps file!",
1736 module_file_spec.GetFilename().AsCString(), GetID());
1737}
1738
1739Status NativeProcessLinux::GetFileLoadAddress(const llvm::StringRef &file_name,
1740 lldb::addr_t &load_addr) {
1741 load_addr = LLDB_INVALID_ADDRESS(18446744073709551615UL);
1742 Status error = PopulateMemoryRegionCache();
1743 if (error.Fail())
1744 return error;
1745
1746 FileSpec file(file_name, false);
1747 for (const auto &it : m_mem_region_cache) {
1748 if (it.second == file) {
1749 load_addr = it.first.GetRange().GetRangeBase();
1750 return Status();
1751 }
1752 }
1753 return Status("No load address found for specified file.");
1754}
1755
1756NativeThreadLinux *NativeProcessLinux::GetThreadByID(lldb::tid_t tid) {
1757 return static_cast<NativeThreadLinux *>(
1758 NativeProcessProtocol::GetThreadByID(tid));
1759}
1760
1761Status NativeProcessLinux::ResumeThread(NativeThreadLinux &thread,
1762 lldb::StateType state, int signo) {
1763 Log *const log = ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2));
1764 LLDB_LOG(log, "tid: {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "tid: {0}", thread.GetID()); } while (0)
;
1765
1766 // Before we do the resume below, first check if we have a pending stop
1767 // notification that is currently waiting for all threads to stop. This is
1768 // potentially a buggy situation since we're ostensibly waiting for threads
1769 // to stop before we send out the pending notification, and here we are
1770 // resuming one before we send out the pending stop notification.
1771 if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0) {
1772 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1773 "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("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1774 "pending stop notification (tid {1}) that is actively "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1775 "waiting for this thread to stop. Valid sequence of events?",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1776 thread.GetID(), m_pending_notification_tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
1777 }
1778
1779 // Request a resume. We expect this to be synchronous and the system to
1780 // reflect it is running after this completes.
1781 switch (state) {
1782 case eStateRunning: {
1783 const auto resume_result = thread.Resume(signo);
1784 if (resume_result.Success())
1785 SetState(eStateRunning, true);
1786 return resume_result;
1787 }
1788 case eStateStepping: {
1789 const auto step_result = thread.SingleStep(signo);
1790 if (step_result.Success())
1791 SetState(eStateRunning, true);
1792 return step_result;
1793 }
1794 default:
1795 LLDB_LOG(log, "Unhandled state {0}.", state)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Unhandled state {0}.", state); } while (0)
;
1796 llvm_unreachable("Unhandled state for resume")::llvm::llvm_unreachable_internal("Unhandled state for resume"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1796)
;
1797 }
1798}
1799
1800//===----------------------------------------------------------------------===//
1801
1802void NativeProcessLinux::StopRunningThreads(const lldb::tid_t triggering_tid) {
1803 Log *const log = ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2));
1804 LLDB_LOG(log, "about to process event: (triggering_tid: {0})",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "about to process event: (triggering_tid: {0})", triggering_tid
); } while (0)
1805 triggering_tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "about to process event: (triggering_tid: {0})", triggering_tid
); } while (0)
;
1806
1807 m_pending_notification_tid = triggering_tid;
1808
1809 // Request a stop for all the thread stops that need to be stopped and are
1810 // not already known to be stopped.
1811 for (const auto &thread : m_threads) {
1812 if (StateIsRunningState(thread->GetState()))
1813 static_cast<NativeThreadLinux *>(thread.get())->RequestStop();
1814 }
1815
1816 SignalIfAllThreadsStopped();
1817 LLDB_LOG(log, "event processing done")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "event processing done"); } while (0)
;
1818}
1819
1820void NativeProcessLinux::SignalIfAllThreadsStopped() {
1821 if (m_pending_notification_tid == LLDB_INVALID_THREAD_ID0)
1822 return; // No pending notification. Nothing to do.
1823
1824 for (const auto &thread_sp : m_threads) {
1825 if (StateIsRunningState(thread_sp->GetState()))
1826 return; // Some threads are still running. Don't signal yet.
1827 }
1828
1829 // We have a pending notification and all threads have stopped.
1830 Log *log(
1831 GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS(1u << 1) | LIBLLDB_LOG_BREAKPOINTS(1u << 5)));
1832
1833 // Clear any temporary breakpoints we used to implement software single
1834 // stepping.
1835 for (const auto &thread_info : m_threads_stepping_with_breakpoint) {
1836 Status error = RemoveBreakpoint(thread_info.second);
1837 if (error.Fail())
1838 LLDB_LOG(log, "pid = {0} remove stepping breakpoint: {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0} remove stepping breakpoint: {1}", thread_info
.first, error); } while (0)
1839 thread_info.first, error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0} remove stepping breakpoint: {1}", thread_info
.first, error); } while (0)
;
1840 }
1841 m_threads_stepping_with_breakpoint.clear();
1842
1843 // Notify the delegate about the stop
1844 SetCurrentThreadID(m_pending_notification_tid);
1845 SetState(StateType::eStateStopped, true);
1846 m_pending_notification_tid = LLDB_INVALID_THREAD_ID0;
1847}
1848
1849void NativeProcessLinux::ThreadWasCreated(NativeThreadLinux &thread) {
1850 Log *const log = ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2));
1851 LLDB_LOG(log, "tid: {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "tid: {0}", thread.GetID()); } while (0)
;
1852
1853 if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0 &&
1854 StateIsRunningState(thread.GetState())) {
1855 // We will need to wait for this new thread to stop as well before firing
1856 // the notification.
1857 thread.RequestStop();
1858 }
1859}
1860
1861void NativeProcessLinux::SigchldHandler() {
1862 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1863 // Process all pending waitpid notifications.
1864 while (true) {
1865 int status = -1;
1866 ::pid_t wait_pid = llvm::sys::RetryAfterSignal(-1, ::waitpid, -1, &status,
1867 __WALL0x40000000 | __WNOTHREAD0x20000000 | WNOHANG1);
1868
1869 if (wait_pid == 0)
1870 break; // We are done.
1871
1872 if (wait_pid == -1) {
1873 Status error(errno(*__errno_location ()), eErrorTypePOSIX);
1874 LLDB_LOG(log, "waitpid (-1, &status, _) failed: {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waitpid (-1, &status, _) failed: {0}", error
); } while (0)
;
1875 break;
1876 }
1877
1878 WaitStatus wait_status = WaitStatus::Decode(status);
1879 bool exited = wait_status.type == WaitStatus::Exit ||
1880 (wait_status.type == WaitStatus::Signal &&
1881 wait_pid == static_cast<::pid_t>(GetID()));
1882
1883 LLDB_LOG(do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waitpid (-1, &status, _) => pid = {0}, status = {1}, exited = {2}"
, wait_pid, wait_status, exited); } while (0)
1884 log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waitpid (-1, &status, _) => pid = {0}, status = {1}, exited = {2}"
, wait_pid, wait_status, exited); } while (0)
1885 "waitpid (-1, &status, _) => pid = {0}, status = {1}, exited = {2}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waitpid (-1, &status, _) => pid = {0}, status = {1}, exited = {2}"
, wait_pid, wait_status, exited); } while (0)
1886 wait_pid, wait_status, exited)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waitpid (-1, &status, _) => pid = {0}, status = {1}, exited = {2}"
, wait_pid, wait_status, exited); } while (0)
;
1887
1888 MonitorCallback(wait_pid, exited, wait_status);
1889 }
1890}
1891
1892// Wrapper for ptrace to catch errors and log calls. Note that ptrace sets
1893// errno on error because -1 can be a valid result (i.e. for PTRACE_PEEK*)
1894Status NativeProcessLinux::PtraceWrapper(int req, lldb::pid_t pid, void *addr,
1895 void *data, size_t data_size,
1896 long *result) {
1897 Status error;
1898 long int ret;
1899
1900 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
1901
1902 PtraceDisplayBytes(req, data, data_size);
1903
1904 errno(*__errno_location ()) = 0;
1905 if (req == PTRACE_GETREGSETPTRACE_GETREGSET || req == PTRACE_SETREGSETPTRACE_SETREGSET)
1906 ret = ptrace(static_cast<__ptrace_request>(req), static_cast<::pid_t>(pid),
1907 *(unsigned int *)addr, data);
1908 else
1909 ret = ptrace(static_cast<__ptrace_request>(req), static_cast<::pid_t>(pid),
1910 addr, data);
1911
1912 if (ret == -1)
1913 error.SetErrorToErrno();
1914
1915 if (result)
1916 *result = ret;
1917
1918 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("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
1919 data_size, ret)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/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)
;
1920
1921 PtraceDisplayBytes(req, data, data_size);
1922
1923 if (error.Fail())
1924 LLDB_LOG(log, "ptrace() failed: {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "ptrace() failed: {0}", error); } while (0)
;
1925
1926 return error;
1927}
1928
1929llvm::Expected<ProcessorTraceMonitor &>
1930NativeProcessLinux::LookupProcessorTraceInstance(lldb::user_id_t traceid,
1931 lldb::tid_t thread) {
1932 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
1933 if (thread == LLDB_INVALID_THREAD_ID0 && traceid == m_pt_proces_trace_id) {
1934 LLDB_LOG(log, "thread not specified: {0}", traceid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "thread not specified: {0}", traceid); } while (0
)
;
1935 return Status("tracing not active thread not specified").ToError();
1936 }
1937
1938 for (auto& iter : m_processor_trace_monitor) {
1939 if (traceid == iter.second->GetTraceID() &&
1940 (thread == iter.first || thread == LLDB_INVALID_THREAD_ID0))
1941 return *(iter.second);
1942 }
1943
1944 LLDB_LOG(log, "traceid not being traced: {0}", traceid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid not being traced: {0}", traceid); } while
(0)
;
1945 return Status("tracing not active for this thread").ToError();
1946}
1947
1948Status NativeProcessLinux::GetMetaData(lldb::user_id_t traceid,
1949 lldb::tid_t thread,
1950 llvm::MutableArrayRef<uint8_t> &buffer,
1951 size_t offset) {
1952 TraceOptions trace_options;
1953 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
1954 Status error;
1955
1956 LLDB_LOG(log, "traceid {0}", traceid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid {0}", traceid); } while (0)
;
1957
1958 auto perf_monitor = LookupProcessorTraceInstance(traceid, thread);
1959 if (!perf_monitor) {
1960 LLDB_LOG(log, "traceid not being traced: {0}", traceid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid not being traced: {0}", traceid); } while
(0)
;
1961 buffer = buffer.slice(buffer.size());
1962 error = perf_monitor.takeError();
1963 return error;
1964 }
1965 return (*perf_monitor).ReadPerfTraceData(buffer, offset);
1966}
1967
1968Status NativeProcessLinux::GetData(lldb::user_id_t traceid, lldb::tid_t thread,
1969 llvm::MutableArrayRef<uint8_t> &buffer,
1970 size_t offset) {
1971 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
1972 Status error;
1973
1974 LLDB_LOG(log, "traceid {0}", traceid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid {0}", traceid); } while (0)
;
1975
1976 auto perf_monitor = LookupProcessorTraceInstance(traceid, thread);
1977 if (!perf_monitor) {
1978 LLDB_LOG(log, "traceid not being traced: {0}", traceid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid not being traced: {0}", traceid); } while
(0)
;
1979 buffer = buffer.slice(buffer.size());
1980 error = perf_monitor.takeError();
1981 return error;
1982 }
1983 return (*perf_monitor).ReadPerfTraceAux(buffer, offset);
1984}
1985
1986Status NativeProcessLinux::GetTraceConfig(lldb::user_id_t traceid,
1987 TraceOptions &config) {
1988 Status error;
1989 if (config.getThreadID() == LLDB_INVALID_THREAD_ID0 &&
5
Assuming the condition is true
7
Taking true branch
1990 m_pt_proces_trace_id == traceid) {
6
Assuming the condition is true
1991 if (m_pt_proces_trace_id == LLDB_INVALID_UID(18446744073709551615UL)) {
8
Assuming the condition is true
9
Taking true branch
1992 error.SetErrorString("tracing not active for this process");
1993 return error;
10
Returning without writing to 'config.m_type'
1994 }
1995 config = m_pt_process_trace_config;
1996 } else {
1997 auto perf_monitor =
1998 LookupProcessorTraceInstance(traceid, config.getThreadID());
1999 if (!perf_monitor) {
2000 error = perf_monitor.takeError();
2001 return error;
2002 }
2003 error = (*perf_monitor).GetTraceConfig(config);
2004 }
2005 return error;
2006}
2007
2008lldb::user_id_t
2009NativeProcessLinux::StartTraceGroup(const TraceOptions &config,
2010 Status &error) {
2011
2012 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2013 if (config.getType() != TraceType::eTraceTypeProcessorTrace)
2014 return LLDB_INVALID_UID(18446744073709551615UL);
2015
2016 if (m_pt_proces_trace_id != LLDB_INVALID_UID(18446744073709551615UL)) {
2017 error.SetErrorString("tracing already active on this process");
2018 return m_pt_proces_trace_id;
2019 }
2020
2021 for (const auto &thread_sp : m_threads) {
2022 if (auto traceInstance = ProcessorTraceMonitor::Create(
2023 GetID(), thread_sp->GetID(), config, true)) {
2024 m_pt_traced_thread_group.insert(thread_sp->GetID());
2025 m_processor_trace_monitor.insert(
2026 std::make_pair(thread_sp->GetID(), std::move(*traceInstance)));
2027 }
2028 }
2029
2030 m_pt_process_trace_config = config;
2031 error = ProcessorTraceMonitor::GetCPUType(m_pt_process_trace_config);
2032
2033 // Trace on Complete process will have traceid of 0
2034 m_pt_proces_trace_id = 0;
2035
2036 LLDB_LOG(log, "Process Trace ID {0}", m_pt_proces_trace_id)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Process Trace ID {0}", m_pt_proces_trace_id); } while
(0)
;
2037 return m_pt_proces_trace_id;
2038}
2039
2040lldb::user_id_t NativeProcessLinux::StartTrace(const TraceOptions &config,
2041 Status &error) {
2042 if (config.getType() != TraceType::eTraceTypeProcessorTrace)
2043 return NativeProcessProtocol::StartTrace(config, error);
2044
2045 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2046
2047 lldb::tid_t threadid = config.getThreadID();
2048
2049 if (threadid == LLDB_INVALID_THREAD_ID0)
2050 return StartTraceGroup(config, error);
2051
2052 auto thread_sp = GetThreadByID(threadid);
2053 if (!thread_sp) {
2054 // Thread not tracked by lldb so don't trace.
2055 error.SetErrorString("invalid thread id");
2056 return LLDB_INVALID_UID(18446744073709551615UL);
2057 }
2058
2059 const auto &iter = m_processor_trace_monitor.find(threadid);
2060 if (iter != m_processor_trace_monitor.end()) {
2061 LLDB_LOG(log, "Thread already being traced")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Thread already being traced"); } while (0)
;
2062 error.SetErrorString("tracing already active on this thread");
2063 return LLDB_INVALID_UID(18446744073709551615UL);
2064 }
2065
2066 auto traceMonitor =
2067 ProcessorTraceMonitor::Create(GetID(), threadid, config, false);
2068 if (!traceMonitor) {
2069 error = traceMonitor.takeError();
2070 LLDB_LOG(log, "error {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "error {0}", error); } while (0)
;
2071 return LLDB_INVALID_UID(18446744073709551615UL);
2072 }
2073 lldb::user_id_t ret_trace_id = (*traceMonitor)->GetTraceID();
2074 m_processor_trace_monitor.insert(
2075 std::make_pair(threadid, std::move(*traceMonitor)));
2076 return ret_trace_id;
2077}
2078
2079Status NativeProcessLinux::StopTracingForThread(lldb::tid_t thread) {
2080 Status error;
2081 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2082 LLDB_LOG(log, "Thread {0}", thread)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Thread {0}", thread); } while (0)
;
2083
2084 const auto& iter = m_processor_trace_monitor.find(thread);
2085 if (iter == m_processor_trace_monitor.end()) {
2086 error.SetErrorString("tracing not active for this thread");
2087 return error;
2088 }
2089
2090 if (iter->second->GetTraceID() == m_pt_proces_trace_id) {
2091 // traceid maps to the whole process so we have to erase it from the thread
2092 // group.
2093 LLDB_LOG(log, "traceid maps to process")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid maps to process"); } while (0)
;
2094 m_pt_traced_thread_group.erase(thread);
2095 }
2096 m_processor_trace_monitor.erase(iter);
2097
2098 return error;
2099}
2100
2101Status NativeProcessLinux::StopTrace(lldb::user_id_t traceid,
2102 lldb::tid_t thread) {
2103 Status error;
2104
2105 TraceOptions trace_options;
1
Calling default constructor for 'TraceOptions'
3
Returning from default constructor for 'TraceOptions'
2106 trace_options.setThreadID(thread);
2107 error = NativeProcessLinux::GetTraceConfig(traceid, trace_options);
4
Calling 'NativeProcessLinux::GetTraceConfig'
11
Returning from 'NativeProcessLinux::GetTraceConfig'
2108
2109 if (error.Fail())
12
Assuming the condition is false
13
Taking false branch
2110 return error;
2111
2112 switch (trace_options.getType()) {
14
Calling 'TraceOptions::getType'
2113 case lldb::TraceType::eTraceTypeProcessorTrace:
2114 if (traceid == m_pt_proces_trace_id &&
2115 thread == LLDB_INVALID_THREAD_ID0)
2116 StopProcessorTracingOnProcess();
2117 else
2118 error = StopProcessorTracingOnThread(traceid, thread);
2119 break;
2120 default:
2121 error.SetErrorString("trace not supported");
2122 break;
2123 }
2124
2125 return error;
2126}
2127
2128void NativeProcessLinux::StopProcessorTracingOnProcess() {
2129 for (auto thread_id_iter : m_pt_traced_thread_group)
2130 m_processor_trace_monitor.erase(thread_id_iter);
2131 m_pt_traced_thread_group.clear();
2132 m_pt_proces_trace_id = LLDB_INVALID_UID(18446744073709551615UL);
2133}
2134
2135Status NativeProcessLinux::StopProcessorTracingOnThread(lldb::user_id_t traceid,
2136 lldb::tid_t thread) {
2137 Status error;
2138 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2139
2140 if (thread == LLDB_INVALID_THREAD_ID0) {
2141 for (auto& iter : m_processor_trace_monitor) {
2142 if (iter.second->GetTraceID() == traceid) {
2143 // Stopping a trace instance for an individual thread hence there will
2144 // only be one traceid that can match.
2145 m_processor_trace_monitor.erase(iter.first);
2146 return error;
2147 }
2148 LLDB_LOG(log, "Trace ID {0}", iter.second->GetTraceID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Trace ID {0}", iter.second->GetTraceID()); } while
(0)
;
2149 }
2150
2151 LLDB_LOG(log, "Invalid TraceID")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Invalid TraceID"); } while (0)
;
2152 error.SetErrorString("invalid trace id");
2153 return error;
2154 }
2155
2156 // thread is specified so we can use find function on the map.
2157 const auto& iter = m_processor_trace_monitor.find(thread);
2158 if (iter == m_processor_trace_monitor.end()) {
2159 // thread not found in our map.
2160 LLDB_LOG(log, "thread not being traced")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "thread not being traced"); } while (0)
;
2161 error.SetErrorString("tracing not active for this thread");
2162 return error;
2163 }
2164 if (iter->second->GetTraceID() != traceid) {
2165 // traceid did not match so it has to be invalid.
2166 LLDB_LOG(log, "Invalid TraceID")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Invalid TraceID"); } while (0)
;
2167 error.SetErrorString("invalid trace id");
2168 return error;
2169 }
2170
2171 LLDB_LOG(log, "UID - {0} , Thread -{1}", traceid, thread)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "UID - {0} , Thread -{1}", traceid, thread); } while
(0)
;
2172
2173 if (traceid == m_pt_proces_trace_id) {
2174 // traceid maps to the whole process so we have to erase it from the thread
2175 // group.
2176 LLDB_LOG(log, "traceid maps to process")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid maps to process"); } while (0)
;
2177 m_pt_traced_thread_group.erase(thread);
2178 }
2179 m_processor_trace_monitor.erase(iter);
2180
2181 return error;
2182}

/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/include/lldb/Utility/TraceOptions.h

1//===-- TraceOptions.h ------------------------------------------*- C++ -*-===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef liblldb_TraceOptions_h_
11#define liblldb_TraceOptions_h_
12
13#include "lldb/lldb-defines.h"
14#include "lldb/lldb-enumerations.h"
15
16#include "lldb/Utility/StructuredData.h"
17
18namespace lldb_private {
19class TraceOptions {
20public:
21 TraceOptions() : m_trace_params(new StructuredData::Dictionary()) {}
2
Returning without writing to 'this->m_type'
22
23 const StructuredData::DictionarySP &getTraceParams() const {
24 return m_trace_params;
25 }
26
27 lldb::TraceType getType() const { return m_type; }
15
Undefined or garbage value returned to caller
28
29 uint64_t getTraceBufferSize() const { return m_trace_buffer_size; }
30
31 uint64_t getMetaDataBufferSize() const { return m_meta_data_buffer_size; }
32
33 void setTraceParams(const StructuredData::DictionarySP &dict_obj) {
34 m_trace_params = dict_obj;
35 }
36
37 void setType(lldb::TraceType type) { m_type = type; }
38
39 void setTraceBufferSize(uint64_t size) { m_trace_buffer_size = size; }
40
41 void setMetaDataBufferSize(uint64_t size) { m_meta_data_buffer_size = size; }
42
43 void setThreadID(lldb::tid_t thread_id) { m_thread_id = thread_id; }
44
45 lldb::tid_t getThreadID() const { return m_thread_id; }
46
47private:
48 lldb::TraceType m_type;
49 uint64_t m_trace_buffer_size;
50 uint64_t m_meta_data_buffer_size;
51 lldb::tid_t m_thread_id;
52
53 /// m_trace_params is meant to hold any custom parameters
54 /// apart from meta buffer size and trace size.
55 /// The interpretation of such parameters is left to
56 /// the lldb-server.
57 StructuredData::DictionarySP m_trace_params;
58};
59}
60
61#endif // liblldb_TraceOptions_h_