1 //===-- NativeThreadNetBSD.cpp --------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "NativeThreadNetBSD.h"
10 #include "NativeRegisterContextNetBSD.h"
11
12 #include "NativeProcessNetBSD.h"
13
14 #include "Plugins/Process/POSIX/CrashReason.h"
15 #include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
16 #include "lldb/Utility/LLDBAssert.h"
17 #include "lldb/Utility/RegisterValue.h"
18 #include "lldb/Utility/State.h"
19 #include "llvm/Support/Errno.h"
20
21 // clang-format off
22 #include <sys/types.h>
23 #include <sys/ptrace.h>
24 // clang-format on
25
26 #include <sstream>
27
28 // clang-format off
29 #include <sys/types.h>
30 #include <sys/sysctl.h>
31 // clang-format on
32
33 using namespace lldb;
34 using namespace lldb_private;
35 using namespace lldb_private::process_netbsd;
36
NativeThreadNetBSD(NativeProcessNetBSD & process,lldb::tid_t tid)37 NativeThreadNetBSD::NativeThreadNetBSD(NativeProcessNetBSD &process,
38 lldb::tid_t tid)
39 : NativeThreadProtocol(process, tid), m_state(StateType::eStateInvalid),
40 m_stop_info(), m_reg_context_up(
41 NativeRegisterContextNetBSD::CreateHostNativeRegisterContextNetBSD(process.GetArchitecture(), *this)
42 ), m_stop_description() {}
43
Resume()44 Status NativeThreadNetBSD::Resume() {
45 Status ret = NativeProcessNetBSD::PtraceWrapper(PT_RESUME, m_process.GetID(),
46 nullptr, GetID());
47 if (!ret.Success())
48 return ret;
49 ret = NativeProcessNetBSD::PtraceWrapper(PT_CLEARSTEP, m_process.GetID(),
50 nullptr, GetID());
51 if (ret.Success())
52 SetRunning();
53 return ret;
54 }
55
SingleStep()56 Status NativeThreadNetBSD::SingleStep() {
57 Status ret = NativeProcessNetBSD::PtraceWrapper(PT_RESUME, m_process.GetID(),
58 nullptr, GetID());
59 if (!ret.Success())
60 return ret;
61 ret = NativeProcessNetBSD::PtraceWrapper(PT_SETSTEP, m_process.GetID(),
62 nullptr, GetID());
63 if (ret.Success())
64 SetStepping();
65 return ret;
66 }
67
Suspend()68 Status NativeThreadNetBSD::Suspend() {
69 Status ret = NativeProcessNetBSD::PtraceWrapper(PT_SUSPEND, m_process.GetID(),
70 nullptr, GetID());
71 if (ret.Success())
72 SetStopped();
73 return ret;
74 }
75
SetStoppedBySignal(uint32_t signo,const siginfo_t * info)76 void NativeThreadNetBSD::SetStoppedBySignal(uint32_t signo,
77 const siginfo_t *info) {
78 Log *log = GetLog(POSIXLog::Thread);
79 LLDB_LOG(log, "tid = {0} in called with signal {1}", GetID(), signo);
80
81 SetStopped();
82
83 m_stop_info.reason = StopReason::eStopReasonSignal;
84 m_stop_info.signo = signo;
85
86 m_stop_description.clear();
87 if (info) {
88 switch (signo) {
89 case SIGSEGV:
90 case SIGBUS:
91 case SIGFPE:
92 case SIGILL:
93 m_stop_description = GetCrashReasonString(*info);
94 break;
95 }
96 }
97 }
98
SetStoppedByBreakpoint()99 void NativeThreadNetBSD::SetStoppedByBreakpoint() {
100 SetStopped();
101 m_stop_info.reason = StopReason::eStopReasonBreakpoint;
102 m_stop_info.signo = SIGTRAP;
103 }
104
SetStoppedByTrace()105 void NativeThreadNetBSD::SetStoppedByTrace() {
106 SetStopped();
107 m_stop_info.reason = StopReason::eStopReasonTrace;
108 m_stop_info.signo = SIGTRAP;
109 }
110
SetStoppedByExec()111 void NativeThreadNetBSD::SetStoppedByExec() {
112 SetStopped();
113 m_stop_info.reason = StopReason::eStopReasonExec;
114 m_stop_info.signo = SIGTRAP;
115 }
116
SetStoppedByWatchpoint(uint32_t wp_index)117 void NativeThreadNetBSD::SetStoppedByWatchpoint(uint32_t wp_index) {
118 lldbassert(wp_index != LLDB_INVALID_INDEX32 && "wp_index cannot be invalid");
119
120 std::ostringstream ostr;
121 ostr << GetRegisterContext().GetWatchpointAddress(wp_index) << " ";
122 ostr << wp_index;
123
124 ostr << " " << GetRegisterContext().GetWatchpointHitAddress(wp_index);
125
126 SetStopped();
127 m_stop_description = ostr.str();
128 m_stop_info.reason = StopReason::eStopReasonWatchpoint;
129 m_stop_info.signo = SIGTRAP;
130 }
131
SetStoppedByFork(lldb::pid_t child_pid,lldb::tid_t child_tid)132 void NativeThreadNetBSD::SetStoppedByFork(lldb::pid_t child_pid,
133 lldb::tid_t child_tid) {
134 SetStopped();
135
136 m_stop_info.reason = StopReason::eStopReasonFork;
137 m_stop_info.signo = SIGTRAP;
138 m_stop_info.details.fork.child_pid = child_pid;
139 m_stop_info.details.fork.child_tid = child_tid;
140 }
141
SetStoppedByVFork(lldb::pid_t child_pid,lldb::tid_t child_tid)142 void NativeThreadNetBSD::SetStoppedByVFork(lldb::pid_t child_pid,
143 lldb::tid_t child_tid) {
144 SetStopped();
145
146 m_stop_info.reason = StopReason::eStopReasonVFork;
147 m_stop_info.signo = SIGTRAP;
148 m_stop_info.details.fork.child_pid = child_pid;
149 m_stop_info.details.fork.child_tid = child_tid;
150 }
151
SetStoppedByVForkDone()152 void NativeThreadNetBSD::SetStoppedByVForkDone() {
153 SetStopped();
154
155 m_stop_info.reason = StopReason::eStopReasonVForkDone;
156 m_stop_info.signo = SIGTRAP;
157 }
158
SetStoppedWithNoReason()159 void NativeThreadNetBSD::SetStoppedWithNoReason() {
160 SetStopped();
161
162 m_stop_info.reason = StopReason::eStopReasonNone;
163 m_stop_info.signo = 0;
164 }
165
SetStopped()166 void NativeThreadNetBSD::SetStopped() {
167 const StateType new_state = StateType::eStateStopped;
168 m_state = new_state;
169 m_stop_description.clear();
170 }
171
SetRunning()172 void NativeThreadNetBSD::SetRunning() {
173 m_state = StateType::eStateRunning;
174 m_stop_info.reason = StopReason::eStopReasonNone;
175 }
176
SetStepping()177 void NativeThreadNetBSD::SetStepping() {
178 m_state = StateType::eStateStepping;
179 m_stop_info.reason = StopReason::eStopReasonNone;
180 }
181
GetName()182 std::string NativeThreadNetBSD::GetName() {
183 Log *log = GetLog(POSIXLog::Thread);
184
185 #ifdef PT_LWPSTATUS
186 struct ptrace_lwpstatus info = {};
187 info.pl_lwpid = m_tid;
188 Status error = NativeProcessNetBSD::PtraceWrapper(
189 PT_LWPSTATUS, static_cast<int>(m_process.GetID()), &info, sizeof(info));
190 if (error.Fail()) {
191 return "";
192 }
193 return info.pl_name;
194 #else
195 std::vector<struct kinfo_lwp> infos;
196 int mib[5] = {CTL_KERN, KERN_LWP, static_cast<int>(m_process.GetID()),
197 sizeof(struct kinfo_lwp), 0};
198 size_t size;
199
200 if (::sysctl(mib, 5, nullptr, &size, nullptr, 0) == -1 || size == 0) {
201 LLDB_LOG(log, "sysctl() for LWP info size failed: {0}",
202 llvm::sys::StrError());
203 return "";
204 }
205
206 mib[4] = size / sizeof(size_t);
207 infos.resize(size / sizeof(struct kinfo_lwp));
208
209 if (sysctl(mib, 5, infos.data(), &size, NULL, 0) == -1 || size == 0) {
210 LLDB_LOG(log, "sysctl() for LWP info failed: {0}", llvm::sys::StrError());
211 return "";
212 }
213
214 size_t nlwps = size / sizeof(struct kinfo_lwp);
215 for (size_t i = 0; i < nlwps; i++) {
216 if (static_cast<lldb::tid_t>(infos[i].l_lid) == m_tid) {
217 return infos[i].l_name;
218 }
219 }
220
221 LLDB_LOG(log, "unable to find lwp {0} in LWP infos", m_tid);
222 return "";
223 #endif
224 }
225
GetState()226 lldb::StateType NativeThreadNetBSD::GetState() { return m_state; }
227
GetStopReason(ThreadStopInfo & stop_info,std::string & description)228 bool NativeThreadNetBSD::GetStopReason(ThreadStopInfo &stop_info,
229 std::string &description) {
230 Log *log = GetLog(POSIXLog::Thread);
231 description.clear();
232
233 switch (m_state) {
234 case eStateStopped:
235 case eStateCrashed:
236 case eStateExited:
237 case eStateSuspended:
238 case eStateUnloaded:
239 stop_info = m_stop_info;
240 description = m_stop_description;
241
242 return true;
243
244 case eStateInvalid:
245 case eStateConnected:
246 case eStateAttaching:
247 case eStateLaunching:
248 case eStateRunning:
249 case eStateStepping:
250 case eStateDetached:
251 LLDB_LOG(log, "tid = {0} in state {1} cannot answer stop reason", GetID(),
252 StateAsCString(m_state));
253 return false;
254 }
255 llvm_unreachable("unhandled StateType!");
256 }
257
GetRegisterContext()258 NativeRegisterContextNetBSD &NativeThreadNetBSD::GetRegisterContext() {
259 assert(m_reg_context_up);
260 return *m_reg_context_up;
261 }
262
SetWatchpoint(lldb::addr_t addr,size_t size,uint32_t watch_flags,bool hardware)263 Status NativeThreadNetBSD::SetWatchpoint(lldb::addr_t addr, size_t size,
264 uint32_t watch_flags, bool hardware) {
265 assert(m_state == eStateStopped);
266 if (!hardware)
267 return Status("not implemented");
268 Status error = RemoveWatchpoint(addr);
269 if (error.Fail())
270 return error;
271 uint32_t wp_index =
272 GetRegisterContext().SetHardwareWatchpoint(addr, size, watch_flags);
273 if (wp_index == LLDB_INVALID_INDEX32)
274 return Status("Setting hardware watchpoint failed.");
275 m_watchpoint_index_map.insert({addr, wp_index});
276 return Status();
277 }
278
RemoveWatchpoint(lldb::addr_t addr)279 Status NativeThreadNetBSD::RemoveWatchpoint(lldb::addr_t addr) {
280 auto wp = m_watchpoint_index_map.find(addr);
281 if (wp == m_watchpoint_index_map.end())
282 return Status();
283 uint32_t wp_index = wp->second;
284 m_watchpoint_index_map.erase(wp);
285 if (GetRegisterContext().ClearHardwareWatchpoint(wp_index))
286 return Status();
287 return Status("Clearing hardware watchpoint failed.");
288 }
289
SetHardwareBreakpoint(lldb::addr_t addr,size_t size)290 Status NativeThreadNetBSD::SetHardwareBreakpoint(lldb::addr_t addr,
291 size_t size) {
292 assert(m_state == eStateStopped);
293 Status error = RemoveHardwareBreakpoint(addr);
294 if (error.Fail())
295 return error;
296
297 uint32_t bp_index = GetRegisterContext().SetHardwareBreakpoint(addr, size);
298
299 if (bp_index == LLDB_INVALID_INDEX32)
300 return Status("Setting hardware breakpoint failed.");
301
302 m_hw_break_index_map.insert({addr, bp_index});
303 return Status();
304 }
305
RemoveHardwareBreakpoint(lldb::addr_t addr)306 Status NativeThreadNetBSD::RemoveHardwareBreakpoint(lldb::addr_t addr) {
307 auto bp = m_hw_break_index_map.find(addr);
308 if (bp == m_hw_break_index_map.end())
309 return Status();
310
311 uint32_t bp_index = bp->second;
312 if (GetRegisterContext().ClearHardwareBreakpoint(bp_index)) {
313 m_hw_break_index_map.erase(bp);
314 return Status();
315 }
316
317 return Status("Clearing hardware breakpoint failed.");
318 }
319
320 llvm::Error
CopyWatchpointsFrom(NativeThreadNetBSD & source)321 NativeThreadNetBSD::CopyWatchpointsFrom(NativeThreadNetBSD &source) {
322 llvm::Error s = GetRegisterContext().CopyHardwareWatchpointsFrom(
323 source.GetRegisterContext());
324 if (!s) {
325 m_watchpoint_index_map = source.m_watchpoint_index_map;
326 m_hw_break_index_map = source.m_hw_break_index_map;
327 }
328 return s;
329 }
330