Bug Summary

File:tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
Warning:line 2240, column 18
Dereference of null pointer

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-eagerly-assume -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-7/lib/clang/7.0.0 -D HAVE_ROUND -D LLDB_CONFIGURATION_RELEASE -D LLDB_USE_BUILTIN_DEMANGLER -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn326425/build-llvm/tools/lldb/source/Plugins/Process/Linux -I /build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux -I /build/llvm-toolchain-snapshot-7~svn326425/build-llvm/tools/lldb/include -I /build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/include -I /build/llvm-toolchain-snapshot-7~svn326425/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn326425/include -I /usr/include/python2.7 -I /build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326425/build-llvm/tools/lldb/../clang/include -I /build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/. -I /build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/. -I /build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/../POSIX -I /build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/../Utility -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/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-7~svn326425/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-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-03-01-211340-26438-1 -x c++ /build/llvm-toolchain-snapshot-7~svn326425/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/Core/RegisterValue.h"
29#include "lldb/Core/State.h"
30#include "lldb/Host/Host.h"
31#include "lldb/Host/HostProcess.h"
32#include "lldb/Host/PseudoTerminal.h"
33#include "lldb/Host/ThreadLauncher.h"
34#include "lldb/Host/common/NativeBreakpoint.h"
35#include "lldb/Host/common/NativeRegisterContext.h"
36#include "lldb/Host/linux/Ptrace.h"
37#include "lldb/Host/linux/Uio.h"
38#include "lldb/Host/posix/ProcessLauncherPosixFork.h"
39#include "lldb/Symbol/ObjectFile.h"
40#include "lldb/Target/Process.h"
41#include "lldb/Target/ProcessLaunchInfo.h"
42#include "lldb/Target/Target.h"
43#include "lldb/Utility/LLDBAssert.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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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)(static_cast <bool> (wpid == pid) ? void (0) : __assert_fail
("wpid == pid", "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 238, __extension__ __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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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())(static_cast <bool> (status.Success()) ? void (0) : __assert_fail
("status.Success()", "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 302, __extension__ __PRETTY_FUNCTION__));
303 }
304
305 Status status;
306 m_sigchld_handle = mainloop.RegisterSignal(
307 SIGCHLD17, [this](MainLoopBase &) { SigchldHandler(); }, status);
1
Calling 'NativeProcessLinux::SigchldHandler'
→
308 assert(m_sigchld_handle && status.Success())(static_cast <bool> (m_sigchld_handle && status
.Success()) ? void (0) : __assert_fail ("m_sigchld_handle && status.Success()"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 308, __extension__ __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.
341 // More error handling 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
352 // At this point we should have a thread stopped if waitpid succeeds.
353 if (wpid < 0) {
354 // No such thread. The thread may have exited.
355 // More error handling 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-7~svn326425/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
401 // (needed to disable legacy 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) {
9
←
Taking false branch
→
418 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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);
10
←
Calling 'NativeProcessLinux::GetSignalInfo'
→
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 have
442 // 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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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.
475 // We can reach here if we reinject SIGSTOP, SIGSTP, SIGTTIN or SIGTTOU
476 // into the tracee, triggering the group-stop mechanism. Normally
477 // receiving these would stop the process, pending a SIGCONT. Simulating
478 // this state in a debugger is hard and is generally not needed (one use
479 // case is debugging background task being managed by a shell). For
480 // general use, it is sufficient to stop the process in a signal-delivery
481 // stop which happens before the group stop. This done by MonitorSignal
482 // and works 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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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
509 // our control. Is eStateExited the right 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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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-7~svn326425/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!")(static_cast <bool> (info.si_signo == 5 && "Unexpected child signal!"
) ? void (0) : __assert_fail ("info.si_signo == SIGTRAP && \"Unexpected child signal!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 574, __extension__ __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.
579 // case (SIGTRAP | (PTRACE_EVENT_FORK << 8)):
580 // case (SIGTRAP | (PTRACE_EVENT_VFORK << 8)):
581
582 case (SIGTRAP5 | (PTRACE_EVENT_CLONE << 8)): {
583 // This is the notification on the parent thread which informs us of new
584 // thread
585 // creation.
586 // We don't want to do anything with the parent thread so we just resume it.
587 // In case we
588 // want to implement "break on thread creation" functionality, we would need
589 // to stop
590 // here.
591
592 unsigned long event_message = 0;
593 if (GetEventMessage(thread.GetID(), &event_message).Fail()) {
594 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
595 "pid {0} received thread creation event but "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
596 "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-7~svn326425/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)
597 thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
598 } else
599 WaitForNewThread(event_message);
600
601 ResumeThread(thread, thread.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647));
602 break;
603 }
604
605 case (SIGTRAP5 | (PTRACE_EVENT_EXEC << 8)): {
606 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received exec event, code = {0}", info.si_code ^
5); } while (0);
607
608 // Exec clears any pending notifications.
609 m_pending_notification_tid = LLDB_INVALID_THREAD_ID0;
610
611 // Remove all but the main thread here. Linux fork creates a new process
612 // which only copies the main thread.
613 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "exec received, stop tracking all but main thread"
); } while (0);
614
615 for (auto i = m_threads.begin(); i != m_threads.end();) {
616 if ((*i)->GetID() == GetID())
617 i = m_threads.erase(i);
618 else
619 ++i;
620 }
621 assert(m_threads.size() == 1)(static_cast <bool> (m_threads.size() == 1) ? void (0) :
__assert_fail ("m_threads.size() == 1", "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 621, __extension__ __PRETTY_FUNCTION__));
622 auto *main_thread = static_cast<NativeThreadLinux *>(m_threads[0].get());
623
624 SetCurrentThreadID(main_thread->GetID());
625 main_thread->SetStoppedByExec();
626
627 // Tell coordinator about about the "new" (since exec) stopped main thread.
628 ThreadWasCreated(*main_thread);
629
630 // Let our delegate know we have just exec'd.
631 NotifyDidExec();
632
633 // Let the process know we're stopped.
634 StopRunningThreads(main_thread->GetID());
635
636 break;
637 }
638
639 case (SIGTRAP5 | (PTRACE_EVENT_EXIT << 8)): {
640 // The inferior process or one of its threads is about to exit.
641 // We don't want to do anything with the thread so we just resume it. In
642 // case we want to implement "break on thread exit" functionality, we would
643 // need to stop here.
644
645 unsigned long data = 0;
646 if (GetEventMessage(thread.GetID(), &data).Fail())
647 data = -1;
648
649 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
650 "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-7~svn326425/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)
651 "WIFSIGNALED={2}, pid = {3}, main_thread = {4}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
652 data, WIFEXITED(data), WIFSIGNALED(data), thread.GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
653 is_main_thread)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
654
655
656 StateType state = thread.GetState();
657 if (!StateIsRunningState(state)) {
658 // Due to a kernel bug, we may sometimes get this stop after the inferior
659 // gets a SIGKILL. This confuses our state tracking logic in
660 // ResumeThread(), since normally, we should not be receiving any ptrace
661 // events while the inferior is stopped. This makes sure that the inferior
662 // is resumed and exits normally.
663 state = eStateRunning;
664 }
665 ResumeThread(thread, state, LLDB_INVALID_SIGNAL_NUMBER(2147483647));
666
667 break;
668 }
669
670 case 0:
671 case TRAP_TRACETRAP_TRACE: // We receive this on single stepping.
672 case TRAP_HWBKPT4: // We receive this on watchpoint hit
673 {
674 // If a watchpoint was hit, report it
675 uint32_t wp_index;
676 Status error = thread.GetRegisterContext().GetWatchpointHitIndex(
677 wp_index, (uintptr_t)info.si_addr_sifields._sigfault.si_addr);
678 if (error.Fail())
679 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
680 "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-7~svn326425/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)
681 "{0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
682 thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
683 if (wp_index != LLDB_INVALID_INDEX32(4294967295U)) {
684 MonitorWatchpoint(thread, wp_index);
685 break;
686 }
687
688 // If a breakpoint was hit, report it
689 uint32_t bp_index;
690 error = thread.GetRegisterContext().GetHardwareBreakHitIndex(
691 bp_index, (uintptr_t)info.si_addr_sifields._sigfault.si_addr);
692 if (error.Fail())
693 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-7~svn326425/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)
694 "breakpoint hits, pid = {0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
695 thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
696 if (bp_index != LLDB_INVALID_INDEX32(4294967295U)) {
697 MonitorBreakpoint(thread);
698 break;
699 }
700
701 // Otherwise, report step over
702 MonitorTrace(thread);
703 break;
704 }
705
706 case SI_KERNELSI_KERNEL:
707#if defined __mips__
708 // For mips there is no special signal for watchpoint
709 // So we check for watchpoint in kernel trap
710 {
711 // If a watchpoint was hit, report it
712 uint32_t wp_index;
713 Status error = thread.GetRegisterContext().GetWatchpointHitIndex(
714 wp_index, LLDB_INVALID_ADDRESS(18446744073709551615UL));
715 if (error.Fail())
716 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
717 "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-7~svn326425/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)
718 "{0}, error = {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
719 thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
720 if (wp_index != LLDB_INVALID_INDEX32(4294967295U)) {
721 MonitorWatchpoint(thread, wp_index);
722 break;
723 }
724 }
725// NO BREAK
726#endif
727 case TRAP_BRKPTTRAP_BRKPT:
728 MonitorBreakpoint(thread);
729 break;
730
731 case SIGTRAP5:
732 case (SIGTRAP5 | 0x80):
733 LLDB_LOG(do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
734 log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
735 "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-7~svn326425/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)
736 info.si_code, GetID(), thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
737
738 // Ignore these signals until we know more about them.
739 ResumeThread(thread, thread.GetState(), LLDB_INVALID_SIGNAL_NUMBER(2147483647));
740 break;
741
742 default:
743 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-7~svn326425/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)
744 info.si_code, GetID(), thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
745 MonitorSignal(info, thread, false);
746 break;
747 }
748}
749
750void NativeProcessLinux::MonitorTrace(NativeThreadLinux &thread) {
751 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
752 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received trace event, pid = {0}", thread.GetID()
); } while (0);
753
754 // This thread is currently stopped.
755 thread.SetStoppedByTrace();
756
757 StopRunningThreads(thread.GetID());
758}
759
760void NativeProcessLinux::MonitorBreakpoint(NativeThreadLinux &thread) {
761 Log *log(
762 GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS(1u << 1) | LIBLLDB_LOG_BREAKPOINTS(1u << 5)));
763 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received breakpoint event, pid = {0}", thread.GetID
()); } while (0);
764
765 // Mark the thread as stopped at breakpoint.
766 thread.SetStoppedByBreakpoint();
767 Status error = FixupBreakpointPCAsNeeded(thread);
768 if (error.Fail())
769 LLDB_LOG(log, "pid = {0} fixup: {1}", thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0} fixup: {1}", thread.GetID(), error); }
while (0);
770
771 if (m_threads_stepping_with_breakpoint.find(thread.GetID()) !=
772 m_threads_stepping_with_breakpoint.end())
773 thread.SetStoppedByTrace();
774
775 StopRunningThreads(thread.GetID());
776}
777
778void NativeProcessLinux::MonitorWatchpoint(NativeThreadLinux &thread,
779 uint32_t wp_index) {
780 Log *log(
781 GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS(1u << 1) | LIBLLDB_LOG_WATCHPOINTS(1u << 6)));
782 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received watchpoint event, pid = {0}, wp_index = {1}"
, thread.GetID(), wp_index); } while (0)
783 thread.GetID(), wp_index)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received watchpoint event, pid = {0}, wp_index = {1}"
, thread.GetID(), wp_index); } while (0);
784
785 // Mark the thread as stopped at watchpoint.
786 // The address is at (lldb::addr_t)info->si_addr if we need it.
787 thread.SetStoppedByWatchpoint(wp_index);
788
789 // We need to tell all other running threads before we notify the delegate
790 // about this stop.
791 StopRunningThreads(thread.GetID());
792}
793
794void NativeProcessLinux::MonitorSignal(const siginfo_t &info,
795 NativeThreadLinux &thread, bool exited) {
796 const int signo = info.si_signo;
797 const bool is_from_llgs = info.si_pid_sifields._kill.si_pid == getpid();
798
799 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
800
801 // POSIX says that process behaviour is undefined after it ignores a SIGFPE,
802 // SIGILL, SIGSEGV, or SIGBUS *unless* that signal was generated by a
803 // kill(2) or raise(3). Similarly for tgkill(2) on Linux.
804 //
805 // IOW, user generated signals never generate what we consider to be a
806 // "crash".
807 //
808 // Similarly, ACK signals generated by this monitor.
809
810 // Handle the signal.
811 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
812 "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-7~svn326425/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)
813 "waitpid pid = {4})",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
814 Host::GetSignalAsCString(signo), signo, info.si_code,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
815 thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
816
817 // Check for thread stop notification.
818 if (is_from_llgs && (info.si_code == SI_TKILLSI_TKILL) && (signo == SIGSTOP19)) {
819 // This is a tgkill()-based stop.
820 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1}, thread stopped", GetID(), thread
.GetID()); } while (0);
821
822 // Check that we're not already marked with a stop reason.
823 // Note this thread really shouldn't already be marked as stopped - if we
824 // were, that would imply that the kernel signaled us with the thread
825 // stopping which we handled and marked as stopped, and that, without an
826 // intervening resume, we received another stop. It is more likely that we
827 // are missing the marking of a run state somewhere if we find that the
828 // thread was marked as stopped.
829 const StateType thread_state = thread.GetState();
830 if (!StateIsStoppedState(thread_state, false)) {
831 // An inferior thread has stopped because of a SIGSTOP we have sent it.
832 // Generally, these are not important stops and we don't want to report
833 // them as they are just used to stop other threads when one thread (the
834 // one with the *real* stop reason) hits a breakpoint (watchpoint,
835 // etc...). However, in the case of an asynchronous Interrupt(), this *is*
836 // the real stop reason, so we leave the signal intact if this is the
837 // thread that was chosen as the triggering thread.
838 if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0) {
839 if (m_pending_notification_tid == thread.GetID())
840 thread.SetStoppedBySignal(SIGSTOP19, &info);
841 else
842 thread.SetStoppedWithNoReason();
843
844 SetCurrentThreadID(thread.GetID());
845 SignalIfAllThreadsStopped();
846 } else {
847 // We can end up here if stop was initiated by LLGS but by this time a
848 // thread stop has occurred - maybe initiated by another event.
849 Status error = ResumeThread(thread, thread.GetState(), 0);
850 if (error.Fail())
851 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to resume thread {0}: {1}", thread.GetID(
), error); } while (0)
852 error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to resume thread {0}: {1}", thread.GetID(
), error); } while (0);
853 }
854 } else {
855 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
856 "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-7~svn326425/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)
857 "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-7~svn326425/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)
858 GetID(), thread.GetID(), thread_state)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
859 SignalIfAllThreadsStopped();
860 }
861
862 // Done handling.
863 return;
864 }
865
866 // Check if debugger should stop at this signal or just ignore it
867 // and resume the inferior.
868 if (m_signals_to_ignore.find(signo) != m_signals_to_ignore.end()) {
869 ResumeThread(thread, thread.GetState(), signo);
870 return;
871 }
872
873 // This thread is stopped.
874 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "received signal {0}", Host::GetSignalAsCString(signo
)); } while (0);
875 thread.SetStoppedBySignal(signo, &info);
876
877 // Send a stop to the debugger after we get all other threads to stop.
878 StopRunningThreads(thread.GetID());
879}
880
881namespace {
882
883struct EmulatorBaton {
884 NativeProcessLinux &m_process;
885 NativeRegisterContext &m_reg_context;
886
887 // eRegisterKindDWARF -> RegsiterValue
888 std::unordered_map<uint32_t, RegisterValue> m_register_values;
889
890 EmulatorBaton(NativeProcessLinux &process, NativeRegisterContext &reg_context)
891 : m_process(process), m_reg_context(reg_context) {}
892};
893
894} // anonymous namespace
895
896static size_t ReadMemoryCallback(EmulateInstruction *instruction, void *baton,
897 const EmulateInstruction::Context &context,
898 lldb::addr_t addr, void *dst, size_t length) {
899 EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
900
901 size_t bytes_read;
902 emulator_baton->m_process.ReadMemory(addr, dst, length, bytes_read);
903 return bytes_read;
904}
905
906static bool ReadRegisterCallback(EmulateInstruction *instruction, void *baton,
907 const RegisterInfo *reg_info,
908 RegisterValue &reg_value) {
909 EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
910
911 auto it = emulator_baton->m_register_values.find(
912 reg_info->kinds[eRegisterKindDWARF]);
913 if (it != emulator_baton->m_register_values.end()) {
914 reg_value = it->second;
915 return true;
916 }
917
918 // The emulator only fill in the dwarf regsiter numbers (and in some case
919 // the generic register numbers). Get the full register info from the
920 // register context based on the dwarf register numbers.
921 const RegisterInfo *full_reg_info =
922 emulator_baton->m_reg_context.GetRegisterInfo(
923 eRegisterKindDWARF, reg_info->kinds[eRegisterKindDWARF]);
924
925 Status error =
926 emulator_baton->m_reg_context.ReadRegister(full_reg_info, reg_value);
927 if (error.Success())
928 return true;
929
930 return false;
931}
932
933static bool WriteRegisterCallback(EmulateInstruction *instruction, void *baton,
934 const EmulateInstruction::Context &context,
935 const RegisterInfo *reg_info,
936 const RegisterValue &reg_value) {
937 EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
938 emulator_baton->m_register_values[reg_info->kinds[eRegisterKindDWARF]] =
939 reg_value;
940 return true;
941}
942
943static size_t WriteMemoryCallback(EmulateInstruction *instruction, void *baton,
944 const EmulateInstruction::Context &context,
945 lldb::addr_t addr, const void *dst,
946 size_t length) {
947 return length;
948}
949
950static lldb::addr_t ReadFlags(NativeRegisterContext &regsiter_context) {
951 const RegisterInfo *flags_info = regsiter_context.GetRegisterInfo(
952 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS4);
953 return regsiter_context.ReadRegisterAsUnsigned(flags_info,
954 LLDB_INVALID_ADDRESS(18446744073709551615UL));
955}
956
957Status
958NativeProcessLinux::SetupSoftwareSingleStepping(NativeThreadLinux &thread) {
959 Status error;
960 NativeRegisterContext& register_context = thread.GetRegisterContext();
961
962 std::unique_ptr<EmulateInstruction> emulator_ap(
963 EmulateInstruction::FindPlugin(m_arch, eInstructionTypePCModifying,
964 nullptr));
965
966 if (emulator_ap == nullptr)
967 return Status("Instruction emulator not found!");
968
969 EmulatorBaton baton(*this, register_context);
970 emulator_ap->SetBaton(&baton);
971 emulator_ap->SetReadMemCallback(&ReadMemoryCallback);
972 emulator_ap->SetReadRegCallback(&ReadRegisterCallback);
973 emulator_ap->SetWriteMemCallback(&WriteMemoryCallback);
974 emulator_ap->SetWriteRegCallback(&WriteRegisterCallback);
975
976 if (!emulator_ap->ReadInstruction())
977 return Status("Read instruction failed!");
978
979 bool emulation_result =
980 emulator_ap->EvaluateInstruction(eEmulateInstructionOptionAutoAdvancePC);
981
982 const RegisterInfo *reg_info_pc = register_context.GetRegisterInfo(
983 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC0);
984 const RegisterInfo *reg_info_flags = register_context.GetRegisterInfo(
985 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS4);
986
987 auto pc_it =
988 baton.m_register_values.find(reg_info_pc->kinds[eRegisterKindDWARF]);
989 auto flags_it =
990 baton.m_register_values.find(reg_info_flags->kinds[eRegisterKindDWARF]);
991
992 lldb::addr_t next_pc;
993 lldb::addr_t next_flags;
994 if (emulation_result) {
995 assert(pc_it != baton.m_register_values.end() &&(static_cast <bool> (pc_it != baton.m_register_values.end
() && "Emulation was successfull but PC wasn't updated"
) ? void (0) : __assert_fail ("pc_it != baton.m_register_values.end() && \"Emulation was successfull but PC wasn't updated\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 996, __extension__ __PRETTY_FUNCTION__))
996 "Emulation was successfull but PC wasn't updated")(static_cast <bool> (pc_it != baton.m_register_values.end
() && "Emulation was successfull but PC wasn't updated"
) ? void (0) : __assert_fail ("pc_it != baton.m_register_values.end() && \"Emulation was successfull but PC wasn't updated\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 996, __extension__ __PRETTY_FUNCTION__));
997 next_pc = pc_it->second.GetAsUInt64();
998
999 if (flags_it != baton.m_register_values.end())
1000 next_flags = flags_it->second.GetAsUInt64();
1001 else
1002 next_flags = ReadFlags(register_context);
1003 } else if (pc_it == baton.m_register_values.end()) {
1004 // Emulate instruction failed and it haven't changed PC. Advance PC
1005 // with the size of the current opcode because the emulation of all
1006 // PC modifying instruction should be successful. The failure most
1007 // likely caused by a not supported instruction which don't modify PC.
1008 next_pc = register_context.GetPC() + emulator_ap->GetOpcode().GetByteSize();
1009 next_flags = ReadFlags(register_context);
1010 } else {
1011 // The instruction emulation failed after it modified the PC. It is an
1012 // unknown error where we can't continue because the next instruction is
1013 // modifying the PC but we don't know how.
1014 return Status("Instruction emulation failed unexpectedly.");
1015 }
1016
1017 if (m_arch.GetMachine() == llvm::Triple::arm) {
1018 if (next_flags & 0x20) {
1019 // Thumb mode
1020 error = SetSoftwareBreakpoint(next_pc, 2);
1021 } else {
1022 // Arm mode
1023 error = SetSoftwareBreakpoint(next_pc, 4);
1024 }
1025 } else if (m_arch.GetMachine() == llvm::Triple::mips64 ||
1026 m_arch.GetMachine() == llvm::Triple::mips64el ||
1027 m_arch.GetMachine() == llvm::Triple::mips ||
1028 m_arch.GetMachine() == llvm::Triple::mipsel ||
1029 m_arch.GetMachine() == llvm::Triple::ppc64le)
1030 error = SetSoftwareBreakpoint(next_pc, 4);
1031 else {
1032 // No size hint is given for the next breakpoint
1033 error = SetSoftwareBreakpoint(next_pc, 0);
1034 }
1035
1036 // If setting the breakpoint fails because next_pc is out of
1037 // the address space, ignore it and let the debugee segfault.
1038 if (error.GetError() == EIO5 || error.GetError() == EFAULT14) {
1039 return Status();
1040 } else if (error.Fail())
1041 return error;
1042
1043 m_threads_stepping_with_breakpoint.insert({thread.GetID(), next_pc});
1044
1045 return Status();
1046}
1047
1048bool NativeProcessLinux::SupportHardwareSingleStepping() const {
1049 if (m_arch.GetMachine() == llvm::Triple::arm ||
1050 m_arch.GetMachine() == llvm::Triple::mips64 ||
1051 m_arch.GetMachine() == llvm::Triple::mips64el ||
1052 m_arch.GetMachine() == llvm::Triple::mips ||
1053 m_arch.GetMachine() == llvm::Triple::mipsel)
1054 return false;
1055 return true;
1056}
1057
1058Status NativeProcessLinux::Resume(const ResumeActionList &resume_actions) {
1059 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1060 LLDB_LOG(log, "pid {0}", GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0}", GetID()); } while (0);
1061
1062 bool software_single_step = !SupportHardwareSingleStepping();
1063
1064 if (software_single_step) {
1065 for (const auto &thread : m_threads) {
1066 assert(thread && "thread list should not contain NULL threads")(static_cast <bool> (thread && "thread list should not contain NULL threads"
) ? void (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1066, __extension__ __PRETTY_FUNCTION__));
1067
1068 const ResumeAction *const action =
1069 resume_actions.GetActionForThread(thread->GetID(), true);
1070 if (action == nullptr)
1071 continue;
1072
1073 if (action->state == eStateStepping) {
1074 Status error = SetupSoftwareSingleStepping(
1075 static_cast<NativeThreadLinux &>(*thread));
1076 if (error.Fail())
1077 return error;
1078 }
1079 }
1080 }
1081
1082 for (const auto &thread : m_threads) {
1083 assert(thread && "thread list should not contain NULL threads")(static_cast <bool> (thread && "thread list should not contain NULL threads"
) ? void (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1083, __extension__ __PRETTY_FUNCTION__));
1084
1085 const ResumeAction *const action =
1086 resume_actions.GetActionForThread(thread->GetID(), true);
1087
1088 if (action == nullptr) {
1089 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "no action specified for pid {0} tid {1}", GetID(
), thread->GetID()); } while (0)
1090 thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "no action specified for pid {0} tid {1}", GetID(
), thread->GetID()); } while (0);
1091 continue;
1092 }
1093
1094 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-7~svn326425/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)
1095 action->state, GetID(), thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
1096
1097 switch (action->state) {
1098 case eStateRunning:
1099 case eStateStepping: {
1100 // Run the thread, possibly feeding it the signal.
1101 const int signo = action->signal;
1102 ResumeThread(static_cast<NativeThreadLinux &>(*thread), action->state,
1103 signo);
1104 break;
1105 }
1106
1107 case eStateSuspended:
1108 case eStateStopped:
1109 llvm_unreachable("Unexpected state")::llvm::llvm_unreachable_internal("Unexpected state", "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1109);
1110
1111 default:
1112 return Status("NativeProcessLinux::%s (): unexpected state %s specified "
1113 "for pid %" PRIu64"l" "u" ", tid %" PRIu64"l" "u",
1114 __FUNCTION__, StateAsCString(action->state), GetID(),
1115 thread->GetID());
1116 }
1117 }
1118
1119 return Status();
1120}
1121
1122Status NativeProcessLinux::Halt() {
1123 Status error;
1124
1125 if (kill(GetID(), SIGSTOP19) != 0)
1126 error.SetErrorToErrno();
1127
1128 return error;
1129}
1130
1131Status NativeProcessLinux::Detach() {
1132 Status error;
1133
1134 // Stop monitoring the inferior.
1135 m_sigchld_handle.reset();
1136
1137 // Tell ptrace to detach from the process.
1138 if (GetID() == LLDB_INVALID_PROCESS_ID0)
1139 return error;
1140
1141 for (const auto &thread : m_threads) {
1142 Status e = Detach(thread->GetID());
1143 if (e.Fail())
1144 error =
1145 e; // Save the error, but still attempt to detach from other threads.
1146 }
1147
1148 m_processor_trace_monitor.clear();
1149 m_pt_proces_trace_id = LLDB_INVALID_UID(18446744073709551615UL);
1150
1151 return error;
1152}
1153
1154Status NativeProcessLinux::Signal(int signo) {
1155 Status error;
1156
1157 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1158 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "sending signal {0} ({1}) to pid {1}", signo, Host
::GetSignalAsCString(signo), GetID()); } while (0)
1159 Host::GetSignalAsCString(signo), GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "sending signal {0} ({1}) to pid {1}", signo, Host
::GetSignalAsCString(signo), GetID()); } while (0);
1160
1161 if (kill(GetID(), signo))
1162 error.SetErrorToErrno();
1163
1164 return error;
1165}
1166
1167Status NativeProcessLinux::Interrupt() {
1168 // Pick a running thread (or if none, a not-dead stopped thread) as
1169 // the chosen thread that will be the stop-reason thread.
1170 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1171
1172 NativeThreadProtocol *running_thread = nullptr;
1173 NativeThreadProtocol *stopped_thread = nullptr;
1174
1175 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "selecting running thread for interrupt target");
} while (0);
1176 for (const auto &thread : m_threads) {
1177 // If we have a running or stepping thread, we'll call that the
1178 // target of the interrupt.
1179 const auto thread_state = thread->GetState();
1180 if (thread_state == eStateRunning || thread_state == eStateStepping) {
1181 running_thread = thread.get();
1182 break;
1183 } else if (!stopped_thread && StateIsStoppedState(thread_state, true)) {
1184 // Remember the first non-dead stopped thread. We'll use that as a backup
1185 // if there are no running threads.
1186 stopped_thread = thread.get();
1187 }
1188 }
1189
1190 if (!running_thread && !stopped_thread) {
1191 Status error("found no running/stepping or live stopped threads as target "
1192 "for interrupt");
1193 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "skipping due to error: {0}", error); } while (0);
1194
1195 return error;
1196 }
1197
1198 NativeThreadProtocol *deferred_signal_thread =
1199 running_thread ? running_thread : stopped_thread;
1200
1201 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-7~svn326425/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)
1202 running_thread ? "running" : "stopped",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
1203 deferred_signal_thread->GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
1204
1205 StopRunningThreads(deferred_signal_thread->GetID());
1206
1207 return Status();
1208}
1209
1210Status NativeProcessLinux::Kill() {
1211 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1212 LLDB_LOG(log, "pid {0}", GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0}", GetID()); } while (0);
1213
1214 Status error;
1215
1216 switch (m_state) {
1217 case StateType::eStateInvalid:
1218 case StateType::eStateExited:
1219 case StateType::eStateCrashed:
1220 case StateType::eStateDetached:
1221 case StateType::eStateUnloaded:
1222 // Nothing to do - the process is already dead.
1223 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "ignored for PID {0} due to current state: {1}", GetID
(), m_state); } while (0)
1224 m_state)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "ignored for PID {0} due to current state: {1}", GetID
(), m_state); } while (0);
1225 return error;
1226
1227 case StateType::eStateConnected:
1228 case StateType::eStateAttaching:
1229 case StateType::eStateLaunching:
1230 case StateType::eStateStopped:
1231 case StateType::eStateRunning:
1232 case StateType::eStateStepping:
1233 case StateType::eStateSuspended:
1234 // We can try to kill a process in these states.
1235 break;
1236 }
1237
1238 if (kill(GetID(), SIGKILL9) != 0) {
1239 error.SetErrorToErrno();
1240 return error;
1241 }
1242
1243 return error;
1244}
1245
1246static Status
1247ParseMemoryRegionInfoFromProcMapsLine(llvm::StringRef &maps_line,
1248 MemoryRegionInfo &memory_region_info) {
1249 memory_region_info.Clear();
1250
1251 StringExtractor line_extractor(maps_line);
1252
1253 // Format: {address_start_hex}-{address_end_hex} perms offset dev inode
1254 // pathname
1255 // perms: rwxp (letter is present if set, '-' if not, final character is
1256 // p=private, s=shared).
1257
1258 // Parse out the starting address
1259 lldb::addr_t start_address = line_extractor.GetHexMaxU64(false, 0);
1260
1261 // Parse out hyphen separating start and end address from range.
1262 if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != '-'))
1263 return Status(
1264 "malformed /proc/{pid}/maps entry, missing dash between address range");
1265
1266 // Parse out the ending address
1267 lldb::addr_t end_address = line_extractor.GetHexMaxU64(false, start_address);
1268
1269 // Parse out the space after the address.
1270 if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != ' '))
1271 return Status(
1272 "malformed /proc/{pid}/maps entry, missing space after range");
1273
1274 // Save the range.
1275 memory_region_info.GetRange().SetRangeBase(start_address);
1276 memory_region_info.GetRange().SetRangeEnd(end_address);
1277
1278 // Any memory region in /proc/{pid}/maps is by definition mapped into the
1279 // process.
1280 memory_region_info.SetMapped(MemoryRegionInfo::OptionalBool::eYes);
1281
1282 // Parse out each permission entry.
1283 if (line_extractor.GetBytesLeft() < 4)
1284 return Status("malformed /proc/{pid}/maps entry, missing some portion of "
1285 "permissions");
1286
1287 // Handle read permission.
1288 const char read_perm_char = line_extractor.GetChar();
1289 if (read_perm_char == 'r')
1290 memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eYes);
1291 else if (read_perm_char == '-')
1292 memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
1293 else
1294 return Status("unexpected /proc/{pid}/maps read permission char");
1295
1296 // Handle write permission.
1297 const char write_perm_char = line_extractor.GetChar();
1298 if (write_perm_char == 'w')
1299 memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eYes);
1300 else if (write_perm_char == '-')
1301 memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
1302 else
1303 return Status("unexpected /proc/{pid}/maps write permission char");
1304
1305 // Handle execute permission.
1306 const char exec_perm_char = line_extractor.GetChar();
1307 if (exec_perm_char == 'x')
1308 memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eYes);
1309 else if (exec_perm_char == '-')
1310 memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
1311 else
1312 return Status("unexpected /proc/{pid}/maps exec permission char");
1313
1314 line_extractor.GetChar(); // Read the private bit
1315 line_extractor.SkipSpaces(); // Skip the separator
1316 line_extractor.GetHexMaxU64(false, 0); // Read the offset
1317 line_extractor.GetHexMaxU64(false, 0); // Read the major device number
1318 line_extractor.GetChar(); // Read the device id separator
1319 line_extractor.GetHexMaxU64(false, 0); // Read the major device number
1320 line_extractor.SkipSpaces(); // Skip the separator
1321 line_extractor.GetU64(0, 10); // Read the inode number
1322
1323 line_extractor.SkipSpaces();
1324 const char *name = line_extractor.Peek();
1325 if (name)
1326 memory_region_info.SetName(name);
1327
1328 return Status();
1329}
1330
1331Status NativeProcessLinux::GetMemoryRegionInfo(lldb::addr_t load_addr,
1332 MemoryRegionInfo &range_info) {
1333 // FIXME review that the final memory region returned extends to the end of
1334 // the virtual address space,
1335 // with no perms if it is not mapped.
1336
1337 // Use an approach that reads memory regions from /proc/{pid}/maps.
1338 // Assume proc maps entries are in ascending order.
1339 // FIXME assert if we find differently.
1340
1341 if (m_supports_mem_region == LazyBool::eLazyBoolNo) {
1342 // We're done.
1343 return Status("unsupported");
1344 }
1345
1346 Status error = PopulateMemoryRegionCache();
1347 if (error.Fail()) {
1348 return error;
1349 }
1350
1351 lldb::addr_t prev_base_address = 0;
1352
1353 // FIXME start by finding the last region that is <= target address using
1354 // binary search. Data is sorted.
1355 // There can be a ton of regions on pthreads apps with lots of threads.
1356 for (auto it = m_mem_region_cache.begin(); it != m_mem_region_cache.end();
1357 ++it) {
1358 MemoryRegionInfo &proc_entry_info = it->first;
1359
1360 // Sanity check assumption that /proc/{pid}/maps entries are ascending.
1361 assert((proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) &&(static_cast <bool> ((proc_entry_info.GetRange().GetRangeBase
() >= prev_base_address) && "descending /proc/pid/maps entries detected, unexpected"
) ? void (0) : __assert_fail ("(proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) && \"descending /proc/pid/maps entries detected, unexpected\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1362, __extension__ __PRETTY_FUNCTION__))
1362 "descending /proc/pid/maps entries detected, unexpected")(static_cast <bool> ((proc_entry_info.GetRange().GetRangeBase
() >= prev_base_address) && "descending /proc/pid/maps entries detected, unexpected"
) ? void (0) : __assert_fail ("(proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) && \"descending /proc/pid/maps entries detected, unexpected\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1362, __extension__ __PRETTY_FUNCTION__));
1363 prev_base_address = proc_entry_info.GetRange().GetRangeBase();
1364 UNUSED_IF_ASSERT_DISABLED(prev_base_address)((void)(prev_base_address));
1365
1366 // If the target address comes before this entry, indicate distance to next
1367 // region.
1368 if (load_addr < proc_entry_info.GetRange().GetRangeBase()) {
1369 range_info.GetRange().SetRangeBase(load_addr);
1370 range_info.GetRange().SetByteSize(
1371 proc_entry_info.GetRange().GetRangeBase() - load_addr);
1372 range_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
1373 range_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
1374 range_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
1375 range_info.SetMapped(MemoryRegionInfo::OptionalBool::eNo);
1376
1377 return error;
1378 } else if (proc_entry_info.GetRange().Contains(load_addr)) {
1379 // The target address is within the memory region we're processing here.
1380 range_info = proc_entry_info;
1381 return error;
1382 }
1383
1384 // The target memory address comes somewhere after the region we just
1385 // parsed.
1386 }
1387
1388 // If we made it here, we didn't find an entry that contained the given
1389 // address. Return the
1390 // load_addr as start and the amount of bytes betwwen load address and the end
1391 // of the memory as
1392 // size.
1393 range_info.GetRange().SetRangeBase(load_addr);
1394 range_info.GetRange().SetRangeEnd(LLDB_INVALID_ADDRESS(18446744073709551615UL));
1395 range_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
1396 range_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
1397 range_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
1398 range_info.SetMapped(MemoryRegionInfo::OptionalBool::eNo);
1399 return error;
1400}
1401
1402Status NativeProcessLinux::PopulateMemoryRegionCache() {
1403 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1404
1405 // If our cache is empty, pull the latest. There should always be at least
1406 // one memory region if memory region handling is supported.
1407 if (!m_mem_region_cache.empty()) {
1408 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "reusing {0} cached memory region entries", m_mem_region_cache
.size()); } while (0)
1409 m_mem_region_cache.size())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "reusing {0} cached memory region entries", m_mem_region_cache
.size()); } while (0);
1410 return Status();
1411 }
1412
1413 auto BufferOrError = getProcFile(GetID(), "maps");
1414 if (!BufferOrError) {
1415 m_supports_mem_region = LazyBool::eLazyBoolNo;
1416 return BufferOrError.getError();
1417 }
1418 StringRef Rest = BufferOrError.get()->getBuffer();
1419 while (! Rest.empty()) {
1420 StringRef Line;
1421 std::tie(Line, Rest) = Rest.split('\n');
1422 MemoryRegionInfo info;
1423 const Status parse_error =
1424 ParseMemoryRegionInfoFromProcMapsLine(Line, info);
1425 if (parse_error.Fail()) {
1426 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to parse proc maps line '{0}': {1}", Line
, parse_error); } while (0)
1427 parse_error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to parse proc maps line '{0}': {1}", Line
, parse_error); } while (0);
1428 m_supports_mem_region = LazyBool::eLazyBoolNo;
1429 return parse_error;
1430 }
1431 m_mem_region_cache.emplace_back(
1432 info, FileSpec(info.GetName().GetCString(), true));
1433 }
1434
1435 if (m_mem_region_cache.empty()) {
1436 // No entries after attempting to read them. This shouldn't happen if
1437 // /proc/{pid}/maps is supported. Assume we don't support map entries
1438 // via procfs.
1439 m_supports_mem_region = LazyBool::eLazyBoolNo;
1440 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
1441 "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-7~svn326425/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)
1442 "for memory region metadata retrieval")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
1443 return Status("not supported");
1444 }
1445
1446 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-7~svn326425/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)
1447 m_mem_region_cache.size(), GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
1448
1449 // We support memory retrieval, remember that.
1450 m_supports_mem_region = LazyBool::eLazyBoolYes;
1451 return Status();
1452}
1453
1454void NativeProcessLinux::DoStopIDBumped(uint32_t newBumpId) {
1455 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1456 LLDB_LOG(log, "newBumpId={0}", newBumpId)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "newBumpId={0}", newBumpId); } while (0);
1457 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "clearing {0} entries from memory region cache", m_mem_region_cache
.size()); } while (0)
1458 m_mem_region_cache.size())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "clearing {0} entries from memory region cache", m_mem_region_cache
.size()); } while (0);
1459 m_mem_region_cache.clear();
1460}
1461
1462Status NativeProcessLinux::AllocateMemory(size_t size, uint32_t permissions,
1463 lldb::addr_t &addr) {
1464// FIXME implementing this requires the equivalent of
1465// InferiorCallPOSIX::InferiorCallMmap, which depends on
1466// functional ThreadPlans working with Native*Protocol.
1467#if 1
1468 return Status("not implemented yet");
1469#else
1470 addr = LLDB_INVALID_ADDRESS(18446744073709551615UL);
1471
1472 unsigned prot = 0;
1473 if (permissions & lldb::ePermissionsReadable)
1474 prot |= eMmapProtRead;
1475 if (permissions & lldb::ePermissionsWritable)
1476 prot |= eMmapProtWrite;
1477 if (permissions & lldb::ePermissionsExecutable)
1478 prot |= eMmapProtExec;
1479
1480 // TODO implement this directly in NativeProcessLinux
1481 // (and lift to NativeProcessPOSIX if/when that class is
1482 // refactored out).
1483 if (InferiorCallMmap(this, addr, 0, size, prot,
1484 eMmapFlagsAnon | eMmapFlagsPrivate, -1, 0)) {
1485 m_addr_to_mmap_size[addr] = size;
1486 return Status();
1487 } else {
1488 addr = LLDB_INVALID_ADDRESS(18446744073709551615UL);
1489 return Status("unable to allocate %" PRIu64"l" "u"
1490 " bytes of memory with permissions %s",
1491 size, GetPermissionsAsCString(permissions));
1492 }
1493#endif
1494}
1495
1496Status NativeProcessLinux::DeallocateMemory(lldb::addr_t addr) {
1497 // FIXME see comments in AllocateMemory - required lower-level
1498 // bits not in place yet (ThreadPlans)
1499 return Status("not implemented");
1500}
1501
1502lldb::addr_t NativeProcessLinux::GetSharedLibraryInfoAddress() {
1503 // punt on this for now
1504 return LLDB_INVALID_ADDRESS(18446744073709551615UL);
1505}
1506
1507size_t NativeProcessLinux::UpdateThreads() {
1508 // The NativeProcessLinux monitoring threads are always up to date
1509 // with respect to thread state and they keep the thread list
1510 // populated properly. All this method needs to do is return the
1511 // thread count.
1512 return m_threads.size();
1513}
1514
1515Status NativeProcessLinux::GetSoftwareBreakpointPCOffset(
1516 uint32_t &actual_opcode_size) {
1517 // FIXME put this behind a breakpoint protocol class that can be
1518 // set per architecture. Need ARM, MIPS support here.
1519 static const uint8_t g_i386_opcode[] = {0xCC};
1520 static const uint8_t g_s390x_opcode[] = {0x00, 0x01};
1521
1522 switch (m_arch.GetMachine()) {
1523 case llvm::Triple::x86:
1524 case llvm::Triple::x86_64:
1525 actual_opcode_size = static_cast<uint32_t>(sizeof(g_i386_opcode));
1526 return Status();
1527
1528 case llvm::Triple::systemz:
1529 actual_opcode_size = static_cast<uint32_t>(sizeof(g_s390x_opcode));
1530 return Status();
1531
1532 case llvm::Triple::arm:
1533 case llvm::Triple::aarch64:
1534 case llvm::Triple::mips64:
1535 case llvm::Triple::mips64el:
1536 case llvm::Triple::mips:
1537 case llvm::Triple::mipsel:
1538 case llvm::Triple::ppc64le:
1539 // On these architectures the PC don't get updated for breakpoint hits
1540 actual_opcode_size = 0;
1541 return Status();
1542
1543 default:
1544 assert(false && "CPU type not supported!")(static_cast <bool> (false && "CPU type not supported!"
) ? void (0) : __assert_fail ("false && \"CPU type not supported!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1544, __extension__ __PRETTY_FUNCTION__));
1545 return Status("CPU type not supported");
1546 }
1547}
1548
1549Status NativeProcessLinux::SetBreakpoint(lldb::addr_t addr, uint32_t size,
1550 bool hardware) {
1551 if (hardware)
1552 return SetHardwareBreakpoint(addr, size);
1553 else
1554 return SetSoftwareBreakpoint(addr, size);
1555}
1556
1557Status NativeProcessLinux::RemoveBreakpoint(lldb::addr_t addr, bool hardware) {
1558 if (hardware)
1559 return RemoveHardwareBreakpoint(addr);
1560 else
1561 return NativeProcessProtocol::RemoveBreakpoint(addr);
1562}
1563
1564Status NativeProcessLinux::GetSoftwareBreakpointTrapOpcode(
1565 size_t trap_opcode_size_hint, size_t &actual_opcode_size,
1566 const uint8_t *&trap_opcode_bytes) {
1567 // FIXME put this behind a breakpoint protocol class that can be set per
1568 // architecture. Need MIPS support here.
1569 static const uint8_t g_aarch64_opcode[] = {0x00, 0x00, 0x20, 0xd4};
1570 // The ARM reference recommends the use of 0xe7fddefe and 0xdefe but the
1571 // linux kernel does otherwise.
1572 static const uint8_t g_arm_breakpoint_opcode[] = {0xf0, 0x01, 0xf0, 0xe7};
1573 static const uint8_t g_i386_opcode[] = {0xCC};
1574 static const uint8_t g_mips64_opcode[] = {0x00, 0x00, 0x00, 0x0d};
1575 static const uint8_t g_mips64el_opcode[] = {0x0d, 0x00, 0x00, 0x00};
1576 static const uint8_t g_s390x_opcode[] = {0x00, 0x01};
1577 static const uint8_t g_thumb_breakpoint_opcode[] = {0x01, 0xde};
1578 static const uint8_t g_ppc64le_opcode[] = {0x08, 0x00, 0xe0, 0x7f}; // trap
1579
1580 switch (m_arch.GetMachine()) {
1581 case llvm::Triple::aarch64:
1582 trap_opcode_bytes = g_aarch64_opcode;
1583 actual_opcode_size = sizeof(g_aarch64_opcode);
1584 return Status();
1585
1586 case llvm::Triple::arm:
1587 switch (trap_opcode_size_hint) {
1588 case 2:
1589 trap_opcode_bytes = g_thumb_breakpoint_opcode;
1590 actual_opcode_size = sizeof(g_thumb_breakpoint_opcode);
1591 return Status();
1592 case 4:
1593 trap_opcode_bytes = g_arm_breakpoint_opcode;
1594 actual_opcode_size = sizeof(g_arm_breakpoint_opcode);
1595 return Status();
1596 default:
1597 assert(false && "Unrecognised trap opcode size hint!")(static_cast <bool> (false && "Unrecognised trap opcode size hint!"
) ? void (0) : __assert_fail ("false && \"Unrecognised trap opcode size hint!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1597, __extension__ __PRETTY_FUNCTION__));
1598 return Status("Unrecognised trap opcode size hint!");
1599 }
1600
1601 case llvm::Triple::x86:
1602 case llvm::Triple::x86_64:
1603 trap_opcode_bytes = g_i386_opcode;
1604 actual_opcode_size = sizeof(g_i386_opcode);
1605 return Status();
1606
1607 case llvm::Triple::mips:
1608 case llvm::Triple::mips64:
1609 trap_opcode_bytes = g_mips64_opcode;
1610 actual_opcode_size = sizeof(g_mips64_opcode);
1611 return Status();
1612
1613 case llvm::Triple::mipsel:
1614 case llvm::Triple::mips64el:
1615 trap_opcode_bytes = g_mips64el_opcode;
1616 actual_opcode_size = sizeof(g_mips64el_opcode);
1617 return Status();
1618
1619 case llvm::Triple::systemz:
1620 trap_opcode_bytes = g_s390x_opcode;
1621 actual_opcode_size = sizeof(g_s390x_opcode);
1622 return Status();
1623
1624 case llvm::Triple::ppc64le:
1625 trap_opcode_bytes = g_ppc64le_opcode;
1626 actual_opcode_size = sizeof(g_ppc64le_opcode);
1627 return Status();
1628
1629 default:
1630 assert(false && "CPU type not supported!")(static_cast <bool> (false && "CPU type not supported!"
) ? void (0) : __assert_fail ("false && \"CPU type not supported!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1630, __extension__ __PRETTY_FUNCTION__));
1631 return Status("CPU type not supported");
1632 }
1633}
1634
1635#if 0
1636ProcessMessage::CrashReason
1637NativeProcessLinux::GetCrashReasonForSIGSEGV(const siginfo_t *info)
1638{
1639 ProcessMessage::CrashReason reason;
1640 assert(info->si_signo == SIGSEGV)(static_cast <bool> (info->si_signo == 11) ? void (0
) : __assert_fail ("info->si_signo == SIGSEGV", "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1640, __extension__ __PRETTY_FUNCTION__));
1641
1642 reason = ProcessMessage::eInvalidCrashReason;
1643
1644 switch (info->si_code)
1645 {
1646 default:
1647 assert(false && "unexpected si_code for SIGSEGV")(static_cast <bool> (false && "unexpected si_code for SIGSEGV"
) ? void (0) : __assert_fail ("false && \"unexpected si_code for SIGSEGV\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1647, __extension__ __PRETTY_FUNCTION__));
1648 break;
1649 case SI_KERNELSI_KERNEL:
1650 // Linux will occasionally send spurious SI_KERNEL codes.
1651 // (this is poorly documented in sigaction)
1652 // One way to get this is via unaligned SIMD loads.
1653 reason = ProcessMessage::eInvalidAddress; // for lack of anything better
1654 break;
1655 case SEGV_MAPERRSEGV_MAPERR:
1656 reason = ProcessMessage::eInvalidAddress;
1657 break;
1658 case SEGV_ACCERRSEGV_ACCERR:
1659 reason = ProcessMessage::ePrivilegedAddress;
1660 break;
1661 }
1662
1663 return reason;
1664}
1665#endif
1666
1667#if 0
1668ProcessMessage::CrashReason
1669NativeProcessLinux::GetCrashReasonForSIGILL(const siginfo_t *info)
1670{
1671 ProcessMessage::CrashReason reason;
1672 assert(info->si_signo == SIGILL)(static_cast <bool> (info->si_signo == 4) ? void (0)
: __assert_fail ("info->si_signo == SIGILL", "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1672, __extension__ __PRETTY_FUNCTION__));
1673
1674 reason = ProcessMessage::eInvalidCrashReason;
1675
1676 switch (info->si_code)
1677 {
1678 default:
1679 assert(false && "unexpected si_code for SIGILL")(static_cast <bool> (false && "unexpected si_code for SIGILL"
) ? void (0) : __assert_fail ("false && \"unexpected si_code for SIGILL\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1679, __extension__ __PRETTY_FUNCTION__));
1680 break;
1681 case ILL_ILLOPCILL_ILLOPC:
1682 reason = ProcessMessage::eIllegalOpcode;
1683 break;
1684 case ILL_ILLOPNILL_ILLOPN:
1685 reason = ProcessMessage::eIllegalOperand;
1686 break;
1687 case ILL_ILLADRILL_ILLADR:
1688 reason = ProcessMessage::eIllegalAddressingMode;
1689 break;
1690 case ILL_ILLTRPILL_ILLTRP:
1691 reason = ProcessMessage::eIllegalTrap;
1692 break;
1693 case ILL_PRVOPCILL_PRVOPC:
1694 reason = ProcessMessage::ePrivilegedOpcode;
1695 break;
1696 case ILL_PRVREGILL_PRVREG:
1697 reason = ProcessMessage::ePrivilegedRegister;
1698 break;
1699 case ILL_COPROCILL_COPROC:
1700 reason = ProcessMessage::eCoprocessorError;
1701 break;
1702 case ILL_BADSTKILL_BADSTK:
1703 reason = ProcessMessage::eInternalStackError;
1704 break;
1705 }
1706
1707 return reason;
1708}
1709#endif
1710
1711#if 0
1712ProcessMessage::CrashReason
1713NativeProcessLinux::GetCrashReasonForSIGFPE(const siginfo_t *info)
1714{
1715 ProcessMessage::CrashReason reason;
1716 assert(info->si_signo == SIGFPE)(static_cast <bool> (info->si_signo == 8) ? void (0)
: __assert_fail ("info->si_signo == SIGFPE", "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1716, __extension__ __PRETTY_FUNCTION__));
1717
1718 reason = ProcessMessage::eInvalidCrashReason;
1719
1720 switch (info->si_code)
1721 {
1722 default:
1723 assert(false && "unexpected si_code for SIGFPE")(static_cast <bool> (false && "unexpected si_code for SIGFPE"
) ? void (0) : __assert_fail ("false && \"unexpected si_code for SIGFPE\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1723, __extension__ __PRETTY_FUNCTION__));
1724 break;
1725 case FPE_INTDIVFPE_INTDIV:
1726 reason = ProcessMessage::eIntegerDivideByZero;
1727 break;
1728 case FPE_INTOVFFPE_INTOVF:
1729 reason = ProcessMessage::eIntegerOverflow;
1730 break;
1731 case FPE_FLTDIVFPE_FLTDIV:
1732 reason = ProcessMessage::eFloatDivideByZero;
1733 break;
1734 case FPE_FLTOVFFPE_FLTOVF:
1735 reason = ProcessMessage::eFloatOverflow;
1736 break;
1737 case FPE_FLTUNDFPE_FLTUND:
1738 reason = ProcessMessage::eFloatUnderflow;
1739 break;
1740 case FPE_FLTRESFPE_FLTRES:
1741 reason = ProcessMessage::eFloatInexactResult;
1742 break;
1743 case FPE_FLTINVFPE_FLTINV:
1744 reason = ProcessMessage::eFloatInvalidOperation;
1745 break;
1746 case FPE_FLTSUBFPE_FLTSUB:
1747 reason = ProcessMessage::eFloatSubscriptRange;
1748 break;
1749 }
1750
1751 return reason;
1752}
1753#endif
1754
1755#if 0
1756ProcessMessage::CrashReason
1757NativeProcessLinux::GetCrashReasonForSIGBUS(const siginfo_t *info)
1758{
1759 ProcessMessage::CrashReason reason;
1760 assert(info->si_signo == SIGBUS)(static_cast <bool> (info->si_signo == 7) ? void (0)
: __assert_fail ("info->si_signo == SIGBUS", "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1760, __extension__ __PRETTY_FUNCTION__));
1761
1762 reason = ProcessMessage::eInvalidCrashReason;
1763
1764 switch (info->si_code)
1765 {
1766 default:
1767 assert(false && "unexpected si_code for SIGBUS")(static_cast <bool> (false && "unexpected si_code for SIGBUS"
) ? void (0) : __assert_fail ("false && \"unexpected si_code for SIGBUS\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1767, __extension__ __PRETTY_FUNCTION__));
1768 break;
1769 case BUS_ADRALNBUS_ADRALN:
1770 reason = ProcessMessage::eIllegalAlignment;
1771 break;
1772 case BUS_ADRERRBUS_ADRERR:
1773 reason = ProcessMessage::eIllegalAddress;
1774 break;
1775 case BUS_OBJERRBUS_OBJERR:
1776 reason = ProcessMessage::eHardwareError;
1777 break;
1778 }
1779
1780 return reason;
1781}
1782#endif
1783
1784Status NativeProcessLinux::ReadMemory(lldb::addr_t addr, void *buf, size_t size,
1785 size_t &bytes_read) {
1786 if (ProcessVmReadvSupported()) {
1787 // The process_vm_readv path is about 50 times faster than ptrace api. We
1788 // want to use
1789 // this syscall if it is supported.
1790
1791 const ::pid_t pid = GetID();
1792
1793 struct iovec local_iov, remote_iov;
1794 local_iov.iov_base = buf;
1795 local_iov.iov_len = size;
1796 remote_iov.iov_base = reinterpret_cast<void *>(addr);
1797 remote_iov.iov_len = size;
1798
1799 bytes_read = process_vm_readv(pid, &local_iov, 1, &remote_iov, 1, 0);
1800 const bool success = bytes_read == size;
1801
1802 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
1803 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
1804 "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-7~svn326425/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)
1805 "address {1:x}: {2}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
1806 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-7~svn326425/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);
1807
1808 if (success)
1809 return Status();
1810 // else the call failed for some reason, let's retry the read using ptrace
1811 // api.
1812 }
1813
1814 unsigned char *dst = static_cast<unsigned char *>(buf);
1815 size_t remainder;
1816 long data;
1817
1818 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_MEMORY(1u << 4)));
1819 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "addr = {0}, buf = {1}, size = {2}", addr, buf, size
); } while (0);
1820
1821 for (bytes_read = 0; bytes_read < size; bytes_read += remainder) {
1822 Status error = NativeProcessLinux::PtraceWrapper(
1823 PTRACE_PEEKDATA, GetID(), (void *)addr, nullptr, 0, &data);
1824 if (error.Fail())
1825 return error;
1826
1827 remainder = size - bytes_read;
1828 remainder = remainder > k_ptrace_word_size ? k_ptrace_word_size : remainder;
1829
1830 // Copy the data into our buffer
1831 memcpy(dst, &data, remainder);
1832
1833 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "[{0:x}]:{1:x}", addr, data); } while (0);
1834 addr += k_ptrace_word_size;
1835 dst += k_ptrace_word_size;
1836 }
1837 return Status();
1838}
1839
1840Status NativeProcessLinux::ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf,
1841 size_t size,
1842 size_t &bytes_read) {
1843 Status error = ReadMemory(addr, buf, size, bytes_read);
1844 if (error.Fail())
1845 return error;
1846 return m_breakpoint_list.RemoveTrapsFromBuffer(addr, buf, size);
1847}
1848
1849Status NativeProcessLinux::WriteMemory(lldb::addr_t addr, const void *buf,
1850 size_t size, size_t &bytes_written) {
1851 const unsigned char *src = static_cast<const unsigned char *>(buf);
1852 size_t remainder;
1853 Status error;
1854
1855 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_MEMORY(1u << 4)));
1856 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "addr = {0}, buf = {1}, size = {2}", addr, buf, size
); } while (0);
1857
1858 for (bytes_written = 0; bytes_written < size; bytes_written += remainder) {
1859 remainder = size - bytes_written;
1860 remainder = remainder > k_ptrace_word_size ? k_ptrace_word_size : remainder;
1861
1862 if (remainder == k_ptrace_word_size) {
1863 unsigned long data = 0;
1864 memcpy(&data, src, k_ptrace_word_size);
1865
1866 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "[{0:x}]:{1:x}", addr, data); } while (0);
1867 error = NativeProcessLinux::PtraceWrapper(PTRACE_POKEDATA, GetID(),
1868 (void *)addr, (void *)data);
1869 if (error.Fail())
1870 return error;
1871 } else {
1872 unsigned char buff[8];
1873 size_t bytes_read;
1874 error = ReadMemory(addr, buff, k_ptrace_word_size, bytes_read);
1875 if (error.Fail())
1876 return error;
1877
1878 memcpy(buff, src, remainder);
1879
1880 size_t bytes_written_rec;
1881 error = WriteMemory(addr, buff, k_ptrace_word_size, bytes_written_rec);
1882 if (error.Fail())
1883 return error;
1884
1885 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-7~svn326425/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)
1886 *(unsigned long *)buff)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
1887 }
1888
1889 addr += k_ptrace_word_size;
1890 src += k_ptrace_word_size;
1891 }
1892 return error;
1893}
1894
1895Status NativeProcessLinux::GetSignalInfo(lldb::tid_t tid, void *siginfo) {
1896 return PtraceWrapper(PTRACE_GETSIGINFO, tid, nullptr, siginfo);
11
←
Passing null pointer value via 3rd parameter 'addr'
→
12
←
Calling 'NativeProcessLinux::PtraceWrapper'
→
1897}
1898
1899Status NativeProcessLinux::GetEventMessage(lldb::tid_t tid,
1900 unsigned long *message) {
1901 return PtraceWrapper(PTRACE_GETEVENTMSG, tid, nullptr, message);
1902}
1903
1904Status NativeProcessLinux::Detach(lldb::tid_t tid) {
1905 if (tid == LLDB_INVALID_THREAD_ID0)
1906 return Status();
1907
1908 return PtraceWrapper(PTRACE_DETACH, tid);
1909}
1910
1911bool NativeProcessLinux::HasThreadNoLock(lldb::tid_t thread_id) {
1912 for (const auto &thread : m_threads) {
1913 assert(thread && "thread list should not contain NULL threads")(static_cast <bool> (thread && "thread list should not contain NULL threads"
) ? void (0) : __assert_fail ("thread && \"thread list should not contain NULL threads\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1913, __extension__ __PRETTY_FUNCTION__));
1914 if (thread->GetID() == thread_id) {
1915 // We have this thread.
1916 return true;
1917 }
1918 }
1919
1920 // We don't have this thread.
1921 return false;
1922}
1923
1924bool NativeProcessLinux::StopTrackingThread(lldb::tid_t thread_id) {
1925 Log *const log = ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2));
1926 LLDB_LOG(log, "tid: {0})", thread_id)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "tid: {0})", thread_id); } while (0);
1927
1928 bool found = false;
1929 for (auto it = m_threads.begin(); it != m_threads.end(); ++it) {
1930 if (*it && ((*it)->GetID() == thread_id)) {
1931 m_threads.erase(it);
1932 found = true;
1933 break;
1934 }
1935 }
1936
1937 if (found)
1938 StopTracingForThread(thread_id);
1939 SignalIfAllThreadsStopped();
1940 return found;
1941}
1942
1943NativeThreadLinux &NativeProcessLinux::AddThread(lldb::tid_t thread_id) {
1944 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2)));
1945 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} adding thread with tid {1}", GetID(), thread_id
); } while (0);
1946
1947 assert(!HasThreadNoLock(thread_id) &&(static_cast <bool> (!HasThreadNoLock(thread_id) &&
"attempted to add a thread by id that already exists") ? void
(0) : __assert_fail ("!HasThreadNoLock(thread_id) && \"attempted to add a thread by id that already exists\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1948, __extension__ __PRETTY_FUNCTION__))
1948 "attempted to add a thread by id that already exists")(static_cast <bool> (!HasThreadNoLock(thread_id) &&
"attempted to add a thread by id that already exists") ? void
(0) : __assert_fail ("!HasThreadNoLock(thread_id) && \"attempted to add a thread by id that already exists\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 1948, __extension__ __PRETTY_FUNCTION__));
1949
1950 // If this is the first thread, save it as the current thread
1951 if (m_threads.empty())
1952 SetCurrentThreadID(thread_id);
1953
1954 m_threads.push_back(llvm::make_unique<NativeThreadLinux>(*this, thread_id));
1955
1956 if (m_pt_proces_trace_id != LLDB_INVALID_UID(18446744073709551615UL)) {
1957 auto traceMonitor = ProcessorTraceMonitor::Create(
1958 GetID(), thread_id, m_pt_process_trace_config, true);
1959 if (traceMonitor) {
1960 m_pt_traced_thread_group.insert(thread_id);
1961 m_processor_trace_monitor.insert(
1962 std::make_pair(thread_id, std::move(*traceMonitor)));
1963 } else {
1964 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "failed to start trace on thread {0}", thread_id)
; } while (0);
1965 Status error(traceMonitor.takeError());
1966 LLDB_LOG(log, "error {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "error {0}", error); } while (0);
1967 }
1968 }
1969
1970 return static_cast<NativeThreadLinux &>(*m_threads.back());
1971}
1972
1973Status
1974NativeProcessLinux::FixupBreakpointPCAsNeeded(NativeThreadLinux &thread) {
1975 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_BREAKPOINTS(1u << 7)));
1976
1977 Status error;
1978
1979 // Find out the size of a breakpoint (might depend on where we are in the
1980 // code).
1981 NativeRegisterContext &context = thread.GetRegisterContext();
1982
1983 uint32_t breakpoint_size = 0;
1984 error = GetSoftwareBreakpointPCOffset(breakpoint_size);
1985 if (error.Fail()) {
1986 LLDB_LOG(log, "GetBreakpointSize() failed: {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "GetBreakpointSize() failed: {0}", error); } while
(0);
1987 return error;
1988 } else
1989 LLDB_LOG(log, "breakpoint size: {0}", breakpoint_size)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "breakpoint size: {0}", breakpoint_size); } while
(0);
1990
1991 // First try probing for a breakpoint at a software breakpoint location: PC -
1992 // breakpoint size.
1993 const lldb::addr_t initial_pc_addr = context.GetPCfromBreakpointLocation();
1994 lldb::addr_t breakpoint_addr = initial_pc_addr;
1995 if (breakpoint_size > 0) {
1996 // Do not allow breakpoint probe to wrap around.
1997 if (breakpoint_addr >= breakpoint_size)
1998 breakpoint_addr -= breakpoint_size;
1999 }
2000
2001 // Check if we stopped because of a breakpoint.
2002 NativeBreakpointSP breakpoint_sp;
2003 error = m_breakpoint_list.GetBreakpoint(breakpoint_addr, breakpoint_sp);
2004 if (!error.Success() || !breakpoint_sp) {
2005 // We didn't find one at a software probe location. Nothing to do.
2006 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} no lldb breakpoint found at current pc with "
"adjustment: {1}", GetID(), breakpoint_addr); } while (0)
2007 "pid {0} no lldb breakpoint found at current pc with "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} no lldb breakpoint found at current pc with "
"adjustment: {1}", GetID(), breakpoint_addr); } while (0)
2008 "adjustment: {1}",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} no lldb breakpoint found at current pc with "
"adjustment: {1}", GetID(), breakpoint_addr); } while (0)
2009 GetID(), breakpoint_addr)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} no lldb breakpoint found at current pc with "
"adjustment: {1}", GetID(), breakpoint_addr); } while (0);
2010 return Status();
2011 }
2012
2013 // If the breakpoint is not a software breakpoint, nothing to do.
2014 if (!breakpoint_sp->IsSoftwareBreakpoint()) {
2015 LLDB_LOG(do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} breakpoint found at {1:x}, not software, nothing to adjust"
, GetID(), breakpoint_addr); } while (0)
2016 log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} breakpoint found at {1:x}, not software, nothing to adjust"
, GetID(), breakpoint_addr); } while (0)
2017 "pid {0} breakpoint found at {1:x}, not software, nothing to adjust",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} breakpoint found at {1:x}, not software, nothing to adjust"
, GetID(), breakpoint_addr); } while (0)
2018 GetID(), breakpoint_addr)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} breakpoint found at {1:x}, not software, nothing to adjust"
, GetID(), breakpoint_addr); } while (0);
2019 return Status();
2020 }
2021
2022 //
2023 // We have a software breakpoint and need to adjust the PC.
2024 //
2025
2026 // Sanity check.
2027 if (breakpoint_size == 0) {
2028 // Nothing to do! How did we get here?
2029 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} breakpoint found at {1:x}, it is software, but the "
"size is zero, nothing to do (unexpected)", GetID(), breakpoint_addr
); } while (0)
2030 "pid {0} breakpoint found at {1:x}, it is software, but the "do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} breakpoint found at {1:x}, it is software, but the "
"size is zero, nothing to do (unexpected)", GetID(), breakpoint_addr
); } while (0)
2031 "size is zero, nothing to do (unexpected)",do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} breakpoint found at {1:x}, it is software, but the "
"size is zero, nothing to do (unexpected)", GetID(), breakpoint_addr
); } while (0)
2032 GetID(), breakpoint_addr)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} breakpoint found at {1:x}, it is software, but the "
"size is zero, nothing to do (unexpected)", GetID(), breakpoint_addr
); } while (0);
2033 return Status();
2034 }
2035
2036 // Change the program counter.
2037 LLDB_LOG(log, "pid {0} tid {1}: changing PC from {2:x} to {3:x}", GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1}: changing PC from {2:x} to {3:x}"
, GetID(), thread.GetID(), initial_pc_addr, breakpoint_addr);
} while (0)
2038 thread.GetID(), initial_pc_addr, breakpoint_addr)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1}: changing PC from {2:x} to {3:x}"
, GetID(), thread.GetID(), initial_pc_addr, breakpoint_addr);
} while (0);
2039
2040 error = context.SetPC(breakpoint_addr);
2041 if (error.Fail()) {
2042 LLDB_LOG(log, "pid {0} tid {1}: failed to set PC: {2}", GetID(),do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1}: failed to set PC: {2}", GetID()
, thread.GetID(), error); } while (0)
2043 thread.GetID(), error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid {0} tid {1}: failed to set PC: {2}", GetID()
, thread.GetID(), error); } while (0);
2044 return error;
2045 }
2046
2047 return error;
2048}
2049
2050Status NativeProcessLinux::GetLoadedModuleFileSpec(const char *module_path,
2051 FileSpec &file_spec) {
2052 Status error = PopulateMemoryRegionCache();
2053 if (error.Fail())
2054 return error;
2055
2056 FileSpec module_file_spec(module_path, true);
2057
2058 file_spec.Clear();
2059 for (const auto &it : m_mem_region_cache) {
2060 if (it.second.GetFilename() == module_file_spec.GetFilename()) {
2061 file_spec = it.second;
2062 return Status();
2063 }
2064 }
2065 return Status("Module file (%s) not found in /proc/%" PRIu64"l" "u" "/maps file!",
2066 module_file_spec.GetFilename().AsCString(), GetID());
2067}
2068
2069Status NativeProcessLinux::GetFileLoadAddress(const llvm::StringRef &file_name,
2070 lldb::addr_t &load_addr) {
2071 load_addr = LLDB_INVALID_ADDRESS(18446744073709551615UL);
2072 Status error = PopulateMemoryRegionCache();
2073 if (error.Fail())
2074 return error;
2075
2076 FileSpec file(file_name, false);
2077 for (const auto &it : m_mem_region_cache) {
2078 if (it.second == file) {
2079 load_addr = it.first.GetRange().GetRangeBase();
2080 return Status();
2081 }
2082 }
2083 return Status("No load address found for specified file.");
2084}
2085
2086NativeThreadLinux *NativeProcessLinux::GetThreadByID(lldb::tid_t tid) {
2087 return static_cast<NativeThreadLinux *>(
2088 NativeProcessProtocol::GetThreadByID(tid));
2089}
2090
2091Status NativeProcessLinux::ResumeThread(NativeThreadLinux &thread,
2092 lldb::StateType state, int signo) {
2093 Log *const log = ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2));
2094 LLDB_LOG(log, "tid: {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "tid: {0}", thread.GetID()); } while (0);
2095
2096 // Before we do the resume below, first check if we have a pending
2097 // stop notification that is currently waiting for
2098 // all threads to stop. This is potentially a buggy situation since
2099 // we're ostensibly waiting for threads to stop before we send out the
2100 // pending notification, and here we are resuming one before we send
2101 // out the pending stop notification.
2102 if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0) {
2103 LLDB_LOG(log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
2104 "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-7~svn326425/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)
2105 "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-7~svn326425/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)
2106 "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-7~svn326425/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)
2107 thread.GetID(), m_pending_notification_tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
2108 }
2109
2110 // Request a resume. We expect this to be synchronous and the system
2111 // to reflect it is running after this completes.
2112 switch (state) {
2113 case eStateRunning: {
2114 const auto resume_result = thread.Resume(signo);
2115 if (resume_result.Success())
2116 SetState(eStateRunning, true);
2117 return resume_result;
2118 }
2119 case eStateStepping: {
2120 const auto step_result = thread.SingleStep(signo);
2121 if (step_result.Success())
2122 SetState(eStateRunning, true);
2123 return step_result;
2124 }
2125 default:
2126 LLDB_LOG(log, "Unhandled state {0}.", state)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Unhandled state {0}.", state); } while (0);
2127 llvm_unreachable("Unhandled state for resume")::llvm::llvm_unreachable_internal("Unhandled state for resume"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, 2127);
2128 }
2129}
2130
2131//===----------------------------------------------------------------------===//
2132
2133void NativeProcessLinux::StopRunningThreads(const lldb::tid_t triggering_tid) {
2134 Log *const log = ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2));
2135 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "about to process event: (triggering_tid: {0})", triggering_tid
); } while (0)
2136 triggering_tid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "about to process event: (triggering_tid: {0})", triggering_tid
); } while (0);
2137
2138 m_pending_notification_tid = triggering_tid;
2139
2140 // Request a stop for all the thread stops that need to be stopped
2141 // and are not already known to be stopped.
2142 for (const auto &thread : m_threads) {
2143 if (StateIsRunningState(thread->GetState()))
2144 static_cast<NativeThreadLinux *>(thread.get())->RequestStop();
2145 }
2146
2147 SignalIfAllThreadsStopped();
2148 LLDB_LOG(log, "event processing done")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "event processing done"); } while (0);
2149}
2150
2151void NativeProcessLinux::SignalIfAllThreadsStopped() {
2152 if (m_pending_notification_tid == LLDB_INVALID_THREAD_ID0)
2153 return; // No pending notification. Nothing to do.
2154
2155 for (const auto &thread_sp : m_threads) {
2156 if (StateIsRunningState(thread_sp->GetState()))
2157 return; // Some threads are still running. Don't signal yet.
2158 }
2159
2160 // We have a pending notification and all threads have stopped.
2161 Log *log(
2162 GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS(1u << 1) | LIBLLDB_LOG_BREAKPOINTS(1u << 5)));
2163
2164 // Clear any temporary breakpoints we used to implement software single
2165 // stepping.
2166 for (const auto &thread_info : m_threads_stepping_with_breakpoint) {
2167 Status error = RemoveBreakpoint(thread_info.second);
2168 if (error.Fail())
2169 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0} remove stepping breakpoint: {1}", thread_info
.first, error); } while (0)
2170 thread_info.first, error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "pid = {0} remove stepping breakpoint: {1}", thread_info
.first, error); } while (0);
2171 }
2172 m_threads_stepping_with_breakpoint.clear();
2173
2174 // Notify the delegate about the stop
2175 SetCurrentThreadID(m_pending_notification_tid);
2176 SetState(StateType::eStateStopped, true);
2177 m_pending_notification_tid = LLDB_INVALID_THREAD_ID0;
2178}
2179
2180void NativeProcessLinux::ThreadWasCreated(NativeThreadLinux &thread) {
2181 Log *const log = ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD(1u << 2));
2182 LLDB_LOG(log, "tid: {0}", thread.GetID())do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "tid: {0}", thread.GetID()); } while (0);
2183
2184 if (m_pending_notification_tid != LLDB_INVALID_THREAD_ID0 &&
2185 StateIsRunningState(thread.GetState())) {
2186 // We will need to wait for this new thread to stop as well before firing
2187 // the
2188 // notification.
2189 thread.RequestStop();
2190 }
2191}
2192
2193void NativeProcessLinux::SigchldHandler() {
2194 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS(1u << 1)));
2195 // Process all pending waitpid notifications.
2196 while (true) {
2
←
Loop condition is true. Entering loop body
→
2197 int status = -1;
2198 ::pid_t wait_pid = llvm::sys::RetryAfterSignal(-1, ::waitpid, -1, &status,
2199 __WALL0x40000000 | __WNOTHREAD0x20000000 | WNOHANG1);
2200
2201 if (wait_pid == 0)
3
←
Assuming 'wait_pid' is not equal to 0
→
4
←
Taking false branch
→
2202 break; // We are done.
2203
2204 if (wait_pid == -1) {
5
←
Taking false branch
→
2205 Status error(errno(*__errno_location ()), eErrorTypePOSIX);
2206 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "waitpid (-1, &status, _) failed: {0}", error
); } while (0);
2207 break;
2208 }
2209
2210 WaitStatus wait_status = WaitStatus::Decode(status);
2211 bool exited = wait_status.type == WaitStatus::Exit ||
6
←
Assuming the condition is false
→
2212 (wait_status.type == WaitStatus::Signal &&
7
←
Assuming the condition is false
→
2213 wait_pid == static_cast<::pid_t>(GetID()));
2214
2215 LLDB_LOG(do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
2216 log,do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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)
2217 "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-7~svn326425/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)
2218 wait_pid, wait_status, exited)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
2219
2220 MonitorCallback(wait_pid, exited, wait_status);
8
←
Calling 'NativeProcessLinux::MonitorCallback'
→
2221 }
2222}
2223
2224// Wrapper for ptrace to catch errors and log calls.
2225// Note that ptrace sets errno on error because -1 can be a valid result (i.e.
2226// for PTRACE_PEEK*)
2227Status NativeProcessLinux::PtraceWrapper(int req, lldb::pid_t pid, void *addr,
2228 void *data, size_t data_size,
2229 long *result) {
2230 Status error;
2231 long int ret;
2232
2233 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2234
2235 PtraceDisplayBytes(req, data, data_size);
2236
2237 errno(*__errno_location ()) = 0;
2238 if (req == PTRACE_GETREGSETPTRACE_GETREGSET || req == PTRACE_SETREGSETPTRACE_SETREGSET)
13
←
Assuming 'req' is equal to PTRACE_GETREGSET
→
2239 ret = ptrace(static_cast<__ptrace_request>(req), static_cast<::pid_t>(pid),
2240 *(unsigned int *)addr, data);
14
←
Dereference of null pointer
2241 else
2242 ret = ptrace(static_cast<__ptrace_request>(req), static_cast<::pid_t>(pid),
2243 addr, data);
2244
2245 if (ret == -1)
2246 error.SetErrorToErrno();
2247
2248 if (result)
2249 *result = ret;
2250
2251 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-7~svn326425/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)
2252 data_size, ret)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/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);
2253
2254 PtraceDisplayBytes(req, data, data_size);
2255
2256 if (error.Fail())
2257 LLDB_LOG(log, "ptrace() failed: {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "ptrace() failed: {0}", error); } while (0);
2258
2259 return error;
2260}
2261
2262llvm::Expected<ProcessorTraceMonitor &>
2263NativeProcessLinux::LookupProcessorTraceInstance(lldb::user_id_t traceid,
2264 lldb::tid_t thread) {
2265 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2266 if (thread == LLDB_INVALID_THREAD_ID0 && traceid == m_pt_proces_trace_id) {
2267 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "thread not specified: {0}", traceid); } while (0
);
2268 return Status("tracing not active thread not specified").ToError();
2269 }
2270
2271 for (auto& iter : m_processor_trace_monitor) {
2272 if (traceid == iter.second->GetTraceID() &&
2273 (thread == iter.first || thread == LLDB_INVALID_THREAD_ID0))
2274 return *(iter.second);
2275 }
2276
2277 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid not being traced: {0}", traceid); } while
(0);
2278 return Status("tracing not active for this thread").ToError();
2279}
2280
2281Status NativeProcessLinux::GetMetaData(lldb::user_id_t traceid,
2282 lldb::tid_t thread,
2283 llvm::MutableArrayRef<uint8_t> &buffer,
2284 size_t offset) {
2285 TraceOptions trace_options;
2286 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2287 Status error;
2288
2289 LLDB_LOG(log, "traceid {0}", traceid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid {0}", traceid); } while (0);
2290
2291 auto perf_monitor = LookupProcessorTraceInstance(traceid, thread);
2292 if (!perf_monitor) {
2293 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid not being traced: {0}", traceid); } while
(0);
2294 buffer = buffer.slice(buffer.size());
2295 error = perf_monitor.takeError();
2296 return error;
2297 }
2298 return (*perf_monitor).ReadPerfTraceData(buffer, offset);
2299}
2300
2301Status NativeProcessLinux::GetData(lldb::user_id_t traceid, lldb::tid_t thread,
2302 llvm::MutableArrayRef<uint8_t> &buffer,
2303 size_t offset) {
2304 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2305 Status error;
2306
2307 LLDB_LOG(log, "traceid {0}", traceid)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid {0}", traceid); } while (0);
2308
2309 auto perf_monitor = LookupProcessorTraceInstance(traceid, thread);
2310 if (!perf_monitor) {
2311 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid not being traced: {0}", traceid); } while
(0);
2312 buffer = buffer.slice(buffer.size());
2313 error = perf_monitor.takeError();
2314 return error;
2315 }
2316 return (*perf_monitor).ReadPerfTraceAux(buffer, offset);
2317}
2318
2319Status NativeProcessLinux::GetTraceConfig(lldb::user_id_t traceid,
2320 TraceOptions &config) {
2321 Status error;
2322 if (config.getThreadID() == LLDB_INVALID_THREAD_ID0 &&
2323 m_pt_proces_trace_id == traceid) {
2324 if (m_pt_proces_trace_id == LLDB_INVALID_UID(18446744073709551615UL)) {
2325 error.SetErrorString("tracing not active for this process");
2326 return error;
2327 }
2328 config = m_pt_process_trace_config;
2329 } else {
2330 auto perf_monitor =
2331 LookupProcessorTraceInstance(traceid, config.getThreadID());
2332 if (!perf_monitor) {
2333 error = perf_monitor.takeError();
2334 return error;
2335 }
2336 error = (*perf_monitor).GetTraceConfig(config);
2337 }
2338 return error;
2339}
2340
2341lldb::user_id_t
2342NativeProcessLinux::StartTraceGroup(const TraceOptions &config,
2343 Status &error) {
2344
2345 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2346 if (config.getType() != TraceType::eTraceTypeProcessorTrace)
2347 return LLDB_INVALID_UID(18446744073709551615UL);
2348
2349 if (m_pt_proces_trace_id != LLDB_INVALID_UID(18446744073709551615UL)) {
2350 error.SetErrorString("tracing already active on this process");
2351 return m_pt_proces_trace_id;
2352 }
2353
2354 for (const auto &thread_sp : m_threads) {
2355 if (auto traceInstance = ProcessorTraceMonitor::Create(
2356 GetID(), thread_sp->GetID(), config, true)) {
2357 m_pt_traced_thread_group.insert(thread_sp->GetID());
2358 m_processor_trace_monitor.insert(
2359 std::make_pair(thread_sp->GetID(), std::move(*traceInstance)));
2360 }
2361 }
2362
2363 m_pt_process_trace_config = config;
2364 error = ProcessorTraceMonitor::GetCPUType(m_pt_process_trace_config);
2365
2366 // Trace on Complete process will have traceid of 0
2367 m_pt_proces_trace_id = 0;
2368
2369 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Process Trace ID {0}", m_pt_proces_trace_id); } while
(0);
2370 return m_pt_proces_trace_id;
2371}
2372
2373lldb::user_id_t NativeProcessLinux::StartTrace(const TraceOptions &config,
2374 Status &error) {
2375 if (config.getType() != TraceType::eTraceTypeProcessorTrace)
2376 return NativeProcessProtocol::StartTrace(config, error);
2377
2378 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2379
2380 lldb::tid_t threadid = config.getThreadID();
2381
2382 if (threadid == LLDB_INVALID_THREAD_ID0)
2383 return StartTraceGroup(config, error);
2384
2385 auto thread_sp = GetThreadByID(threadid);
2386 if (!thread_sp) {
2387 // Thread not tracked by lldb so don't trace.
2388 error.SetErrorString("invalid thread id");
2389 return LLDB_INVALID_UID(18446744073709551615UL);
2390 }
2391
2392 const auto &iter = m_processor_trace_monitor.find(threadid);
2393 if (iter != m_processor_trace_monitor.end()) {
2394 LLDB_LOG(log, "Thread already being traced")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Thread already being traced"); } while (0);
2395 error.SetErrorString("tracing already active on this thread");
2396 return LLDB_INVALID_UID(18446744073709551615UL);
2397 }
2398
2399 auto traceMonitor =
2400 ProcessorTraceMonitor::Create(GetID(), threadid, config, false);
2401 if (!traceMonitor) {
2402 error = traceMonitor.takeError();
2403 LLDB_LOG(log, "error {0}", error)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "error {0}", error); } while (0);
2404 return LLDB_INVALID_UID(18446744073709551615UL);
2405 }
2406 lldb::user_id_t ret_trace_id = (*traceMonitor)->GetTraceID();
2407 m_processor_trace_monitor.insert(
2408 std::make_pair(threadid, std::move(*traceMonitor)));
2409 return ret_trace_id;
2410}
2411
2412Status NativeProcessLinux::StopTracingForThread(lldb::tid_t thread) {
2413 Status error;
2414 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2415 LLDB_LOG(log, "Thread {0}", thread)do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Thread {0}", thread); } while (0);
2416
2417 const auto& iter = m_processor_trace_monitor.find(thread);
2418 if (iter == m_processor_trace_monitor.end()) {
2419 error.SetErrorString("tracing not active for this thread");
2420 return error;
2421 }
2422
2423 if (iter->second->GetTraceID() == m_pt_proces_trace_id) {
2424 // traceid maps to the whole process so we have to erase it from the
2425 // thread group.
2426 LLDB_LOG(log, "traceid maps to process")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid maps to process"); } while (0);
2427 m_pt_traced_thread_group.erase(thread);
2428 }
2429 m_processor_trace_monitor.erase(iter);
2430
2431 return error;
2432}
2433
2434Status NativeProcessLinux::StopTrace(lldb::user_id_t traceid,
2435 lldb::tid_t thread) {
2436 Status error;
2437
2438 TraceOptions trace_options;
2439 trace_options.setThreadID(thread);
2440 error = NativeProcessLinux::GetTraceConfig(traceid, trace_options);
2441
2442 if (error.Fail())
2443 return error;
2444
2445 switch (trace_options.getType()) {
2446 case lldb::TraceType::eTraceTypeProcessorTrace:
2447 if (traceid == m_pt_proces_trace_id &&
2448 thread == LLDB_INVALID_THREAD_ID0)
2449 StopProcessorTracingOnProcess();
2450 else
2451 error = StopProcessorTracingOnThread(traceid, thread);
2452 break;
2453 default:
2454 error.SetErrorString("trace not supported");
2455 break;
2456 }
2457
2458 return error;
2459}
2460
2461void NativeProcessLinux::StopProcessorTracingOnProcess() {
2462 for (auto thread_id_iter : m_pt_traced_thread_group)
2463 m_processor_trace_monitor.erase(thread_id_iter);
2464 m_pt_traced_thread_group.clear();
2465 m_pt_proces_trace_id = LLDB_INVALID_UID(18446744073709551615UL);
2466}
2467
2468Status NativeProcessLinux::StopProcessorTracingOnThread(lldb::user_id_t traceid,
2469 lldb::tid_t thread) {
2470 Status error;
2471 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE(1u << 5)));
2472
2473 if (thread == LLDB_INVALID_THREAD_ID0) {
2474 for (auto& iter : m_processor_trace_monitor) {
2475 if (iter.second->GetTraceID() == traceid) {
2476 // Stopping a trace instance for an individual thread
2477 // hence there will only be one traceid that can match.
2478 m_processor_trace_monitor.erase(iter.first);
2479 return error;
2480 }
2481 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Trace ID {0}", iter.second->GetTraceID()); } while
(0);
2482 }
2483
2484 LLDB_LOG(log, "Invalid TraceID")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Invalid TraceID"); } while (0);
2485 error.SetErrorString("invalid trace id");
2486 return error;
2487 }
2488
2489 // thread is specified so we can use find function on the map.
2490 const auto& iter = m_processor_trace_monitor.find(thread);
2491 if (iter == m_processor_trace_monitor.end()) {
2492 // thread not found in our map.
2493 LLDB_LOG(log, "thread not being traced")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "thread not being traced"); } while (0);
2494 error.SetErrorString("tracing not active for this thread");
2495 return error;
2496 }
2497 if (iter->second->GetTraceID() != traceid) {
2498 // traceid did not match so it has to be invalid.
2499 LLDB_LOG(log, "Invalid TraceID")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "Invalid TraceID"); } while (0);
2500 error.SetErrorString("invalid trace id");
2501 return error;
2502 }
2503
2504 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-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "UID - {0} , Thread -{1}", traceid, thread); } while
(0);
2505
2506 if (traceid == m_pt_proces_trace_id) {
2507 // traceid maps to the whole process so we have to erase it from the
2508 // thread group.
2509 LLDB_LOG(log, "traceid maps to process")do { ::lldb_private::Log *log_private = (log); if (log_private
) log_private->Format("/build/llvm-toolchain-snapshot-7~svn326425/tools/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp"
, __func__, "traceid maps to process"); } while (0);
2510 m_pt_traced_thread_group.erase(thread);
2511 }
2512 m_processor_trace_monitor.erase(iter);
2513
2514 return error;
2515}