1 //===-- NativeThreadNetBSD.cpp -------------------------------- -*- C++ -*-===//
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(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_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.details.signal.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 const auto reason = GetCrashReason(*info);
94 m_stop_description = GetCrashReasonString(reason, *info);
95 break;
96 }
97 }
98 }
99
SetStoppedByBreakpoint()100 void NativeThreadNetBSD::SetStoppedByBreakpoint() {
101 SetStopped();
102 m_stop_info.reason = StopReason::eStopReasonBreakpoint;
103 m_stop_info.details.signal.signo = SIGTRAP;
104 }
105
SetStoppedByTrace()106 void NativeThreadNetBSD::SetStoppedByTrace() {
107 SetStopped();
108 m_stop_info.reason = StopReason::eStopReasonTrace;
109 m_stop_info.details.signal.signo = SIGTRAP;
110 }
111
SetStoppedByExec()112 void NativeThreadNetBSD::SetStoppedByExec() {
113 SetStopped();
114 m_stop_info.reason = StopReason::eStopReasonExec;
115 m_stop_info.details.signal.signo = SIGTRAP;
116 }
117
SetStoppedByWatchpoint(uint32_t wp_index)118 void NativeThreadNetBSD::SetStoppedByWatchpoint(uint32_t wp_index) {
119 SetStopped();
120
121 lldbassert(wp_index != LLDB_INVALID_INDEX32 && "wp_index cannot be invalid");
122
123 std::ostringstream ostr;
124 ostr << GetRegisterContext().GetWatchpointAddress(wp_index) << " ";
125 ostr << wp_index;
126
127 ostr << " " << GetRegisterContext().GetWatchpointHitAddress(wp_index);
128
129 m_stop_description = ostr.str();
130
131 m_stop_info.reason = StopReason::eStopReasonWatchpoint;
132 m_stop_info.details.signal.signo = SIGTRAP;
133 }
134
SetStoppedWithNoReason()135 void NativeThreadNetBSD::SetStoppedWithNoReason() {
136 SetStopped();
137
138 m_stop_info.reason = StopReason::eStopReasonNone;
139 m_stop_info.details.signal.signo = 0;
140 }
141
SetStopped()142 void NativeThreadNetBSD::SetStopped() {
143 const StateType new_state = StateType::eStateStopped;
144 m_state = new_state;
145 m_stop_description.clear();
146 }
147
SetRunning()148 void NativeThreadNetBSD::SetRunning() {
149 m_state = StateType::eStateRunning;
150 m_stop_info.reason = StopReason::eStopReasonNone;
151 }
152
SetStepping()153 void NativeThreadNetBSD::SetStepping() {
154 m_state = StateType::eStateStepping;
155 m_stop_info.reason = StopReason::eStopReasonNone;
156 }
157
GetName()158 std::string NativeThreadNetBSD::GetName() {
159 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD));
160
161 #ifdef PT_LWPSTATUS
162 struct ptrace_lwpstatus info = {};
163 info.pl_lwpid = m_tid;
164 Status error = NativeProcessNetBSD::PtraceWrapper(
165 PT_LWPSTATUS, static_cast<int>(m_process.GetID()), &info, sizeof(info));
166 if (error.Fail()) {
167 return "";
168 }
169 return info.pl_name;
170 #else
171 std::vector<struct kinfo_lwp> infos;
172 int mib[5] = {CTL_KERN, KERN_LWP, static_cast<int>(m_process.GetID()),
173 sizeof(struct kinfo_lwp), 0};
174 size_t size;
175
176 if (::sysctl(mib, 5, nullptr, &size, nullptr, 0) == -1 || size == 0) {
177 LLDB_LOG(log, "sysctl() for LWP info size failed: {0}",
178 llvm::sys::StrError());
179 return "";
180 }
181
182 mib[4] = size / sizeof(size_t);
183 infos.resize(size / sizeof(struct kinfo_lwp));
184
185 if (sysctl(mib, 5, infos.data(), &size, NULL, 0) == -1 || size == 0) {
186 LLDB_LOG(log, "sysctl() for LWP info failed: {0}", llvm::sys::StrError());
187 return "";
188 }
189
190 size_t nlwps = size / sizeof(struct kinfo_lwp);
191 for (size_t i = 0; i < nlwps; i++) {
192 if (static_cast<lldb::tid_t>(infos[i].l_lid) == m_tid) {
193 return infos[i].l_name;
194 }
195 }
196
197 LLDB_LOG(log, "unable to find lwp {0} in LWP infos", m_tid);
198 return "";
199 #endif
200 }
201
GetState()202 lldb::StateType NativeThreadNetBSD::GetState() { return m_state; }
203
GetStopReason(ThreadStopInfo & stop_info,std::string & description)204 bool NativeThreadNetBSD::GetStopReason(ThreadStopInfo &stop_info,
205 std::string &description) {
206 Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD));
207
208 description.clear();
209
210 switch (m_state) {
211 case eStateStopped:
212 case eStateCrashed:
213 case eStateExited:
214 case eStateSuspended:
215 case eStateUnloaded:
216 stop_info = m_stop_info;
217 description = m_stop_description;
218
219 return true;
220
221 case eStateInvalid:
222 case eStateConnected:
223 case eStateAttaching:
224 case eStateLaunching:
225 case eStateRunning:
226 case eStateStepping:
227 case eStateDetached:
228 LLDB_LOG(log, "tid = {0} in state {1} cannot answer stop reason", GetID(),
229 StateAsCString(m_state));
230 return false;
231 }
232 llvm_unreachable("unhandled StateType!");
233 }
234
GetRegisterContext()235 NativeRegisterContextNetBSD &NativeThreadNetBSD::GetRegisterContext() {
236 assert(m_reg_context_up);
237 return *m_reg_context_up;
238 }
239
SetWatchpoint(lldb::addr_t addr,size_t size,uint32_t watch_flags,bool hardware)240 Status NativeThreadNetBSD::SetWatchpoint(lldb::addr_t addr, size_t size,
241 uint32_t watch_flags, bool hardware) {
242 if (!hardware)
243 return Status("not implemented");
244 if (m_state == eStateLaunching)
245 return Status();
246 Status error = RemoveWatchpoint(addr);
247 if (error.Fail())
248 return error;
249 uint32_t wp_index = GetRegisterContext().SetHardwareWatchpoint(addr, size, watch_flags);
250 if (wp_index == LLDB_INVALID_INDEX32)
251 return Status("Setting hardware watchpoint failed.");
252 m_watchpoint_index_map.insert({addr, wp_index});
253 return Status();
254 }
255
RemoveWatchpoint(lldb::addr_t addr)256 Status NativeThreadNetBSD::RemoveWatchpoint(lldb::addr_t addr) {
257 auto wp = m_watchpoint_index_map.find(addr);
258 if (wp == m_watchpoint_index_map.end())
259 return Status();
260 uint32_t wp_index = wp->second;
261 m_watchpoint_index_map.erase(wp);
262 if (GetRegisterContext().ClearHardwareWatchpoint(wp_index))
263 return Status();
264 return Status("Clearing hardware watchpoint failed.");
265 }
266
SetHardwareBreakpoint(lldb::addr_t addr,size_t size)267 Status NativeThreadNetBSD::SetHardwareBreakpoint(lldb::addr_t addr,
268 size_t size) {
269 if (m_state == eStateLaunching)
270 return Status();
271
272 Status error = RemoveHardwareBreakpoint(addr);
273 if (error.Fail())
274 return error;
275
276 uint32_t bp_index = GetRegisterContext().SetHardwareBreakpoint(addr, size);
277
278 if (bp_index == LLDB_INVALID_INDEX32)
279 return Status("Setting hardware breakpoint failed.");
280
281 m_hw_break_index_map.insert({addr, bp_index});
282 return Status();
283 }
284
RemoveHardwareBreakpoint(lldb::addr_t addr)285 Status NativeThreadNetBSD::RemoveHardwareBreakpoint(lldb::addr_t addr) {
286 auto bp = m_hw_break_index_map.find(addr);
287 if (bp == m_hw_break_index_map.end())
288 return Status();
289
290 uint32_t bp_index = bp->second;
291 if (GetRegisterContext().ClearHardwareBreakpoint(bp_index)) {
292 m_hw_break_index_map.erase(bp);
293 return Status();
294 }
295
296 return Status("Clearing hardware breakpoint failed.");
297 }
298
CopyWatchpointsFrom(NativeThreadNetBSD & source)299 Status NativeThreadNetBSD::CopyWatchpointsFrom(NativeThreadNetBSD &source) {
300 Status s = GetRegisterContext().CopyHardwareWatchpointsFrom(
301 source.GetRegisterContext());
302 if (!s.Fail()) {
303 m_watchpoint_index_map = source.m_watchpoint_index_map;
304 m_hw_break_index_map = source.m_hw_break_index_map;
305 }
306 return s;
307 }
308