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 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 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 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 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 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 const auto reason = GetCrashReason(*info); 94 m_stop_description = GetCrashReasonString(reason, *info); 95 break; 96 } 97 } 98 } 99 100 void NativeThreadNetBSD::SetStoppedByBreakpoint() { 101 SetStopped(); 102 m_stop_info.reason = StopReason::eStopReasonBreakpoint; 103 m_stop_info.signo = SIGTRAP; 104 } 105 106 void NativeThreadNetBSD::SetStoppedByTrace() { 107 SetStopped(); 108 m_stop_info.reason = StopReason::eStopReasonTrace; 109 m_stop_info.signo = SIGTRAP; 110 } 111 112 void NativeThreadNetBSD::SetStoppedByExec() { 113 SetStopped(); 114 m_stop_info.reason = StopReason::eStopReasonExec; 115 m_stop_info.signo = SIGTRAP; 116 } 117 118 void NativeThreadNetBSD::SetStoppedByWatchpoint(uint32_t wp_index) { 119 lldbassert(wp_index != LLDB_INVALID_INDEX32 && "wp_index cannot be invalid"); 120 121 std::ostringstream ostr; 122 ostr << GetRegisterContext().GetWatchpointAddress(wp_index) << " "; 123 ostr << wp_index; 124 125 ostr << " " << GetRegisterContext().GetWatchpointHitAddress(wp_index); 126 127 SetStopped(); 128 m_stop_description = ostr.str(); 129 m_stop_info.reason = StopReason::eStopReasonWatchpoint; 130 m_stop_info.signo = SIGTRAP; 131 } 132 133 void NativeThreadNetBSD::SetStoppedByFork(lldb::pid_t child_pid, 134 lldb::tid_t child_tid) { 135 SetStopped(); 136 137 m_stop_info.reason = StopReason::eStopReasonFork; 138 m_stop_info.signo = SIGTRAP; 139 m_stop_info.details.fork.child_pid = child_pid; 140 m_stop_info.details.fork.child_tid = child_tid; 141 } 142 143 void NativeThreadNetBSD::SetStoppedByVFork(lldb::pid_t child_pid, 144 lldb::tid_t child_tid) { 145 SetStopped(); 146 147 m_stop_info.reason = StopReason::eStopReasonVFork; 148 m_stop_info.signo = SIGTRAP; 149 m_stop_info.details.fork.child_pid = child_pid; 150 m_stop_info.details.fork.child_tid = child_tid; 151 } 152 153 void NativeThreadNetBSD::SetStoppedByVForkDone() { 154 SetStopped(); 155 156 m_stop_info.reason = StopReason::eStopReasonVForkDone; 157 m_stop_info.signo = SIGTRAP; 158 } 159 160 void NativeThreadNetBSD::SetStoppedWithNoReason() { 161 SetStopped(); 162 163 m_stop_info.reason = StopReason::eStopReasonNone; 164 m_stop_info.signo = 0; 165 } 166 167 void NativeThreadNetBSD::SetStopped() { 168 const StateType new_state = StateType::eStateStopped; 169 m_state = new_state; 170 m_stop_description.clear(); 171 } 172 173 void NativeThreadNetBSD::SetRunning() { 174 m_state = StateType::eStateRunning; 175 m_stop_info.reason = StopReason::eStopReasonNone; 176 } 177 178 void NativeThreadNetBSD::SetStepping() { 179 m_state = StateType::eStateStepping; 180 m_stop_info.reason = StopReason::eStopReasonNone; 181 } 182 183 std::string NativeThreadNetBSD::GetName() { 184 Log *log = GetLog(POSIXLog::Thread); 185 186 #ifdef PT_LWPSTATUS 187 struct ptrace_lwpstatus info = {}; 188 info.pl_lwpid = m_tid; 189 Status error = NativeProcessNetBSD::PtraceWrapper( 190 PT_LWPSTATUS, static_cast<int>(m_process.GetID()), &info, sizeof(info)); 191 if (error.Fail()) { 192 return ""; 193 } 194 return info.pl_name; 195 #else 196 std::vector<struct kinfo_lwp> infos; 197 int mib[5] = {CTL_KERN, KERN_LWP, static_cast<int>(m_process.GetID()), 198 sizeof(struct kinfo_lwp), 0}; 199 size_t size; 200 201 if (::sysctl(mib, 5, nullptr, &size, nullptr, 0) == -1 || size == 0) { 202 LLDB_LOG(log, "sysctl() for LWP info size failed: {0}", 203 llvm::sys::StrError()); 204 return ""; 205 } 206 207 mib[4] = size / sizeof(size_t); 208 infos.resize(size / sizeof(struct kinfo_lwp)); 209 210 if (sysctl(mib, 5, infos.data(), &size, NULL, 0) == -1 || size == 0) { 211 LLDB_LOG(log, "sysctl() for LWP info failed: {0}", llvm::sys::StrError()); 212 return ""; 213 } 214 215 size_t nlwps = size / sizeof(struct kinfo_lwp); 216 for (size_t i = 0; i < nlwps; i++) { 217 if (static_cast<lldb::tid_t>(infos[i].l_lid) == m_tid) { 218 return infos[i].l_name; 219 } 220 } 221 222 LLDB_LOG(log, "unable to find lwp {0} in LWP infos", m_tid); 223 return ""; 224 #endif 225 } 226 227 lldb::StateType NativeThreadNetBSD::GetState() { return m_state; } 228 229 bool NativeThreadNetBSD::GetStopReason(ThreadStopInfo &stop_info, 230 std::string &description) { 231 Log *log = GetLog(POSIXLog::Thread); 232 description.clear(); 233 234 switch (m_state) { 235 case eStateStopped: 236 case eStateCrashed: 237 case eStateExited: 238 case eStateSuspended: 239 case eStateUnloaded: 240 stop_info = m_stop_info; 241 description = m_stop_description; 242 243 return true; 244 245 case eStateInvalid: 246 case eStateConnected: 247 case eStateAttaching: 248 case eStateLaunching: 249 case eStateRunning: 250 case eStateStepping: 251 case eStateDetached: 252 LLDB_LOG(log, "tid = {0} in state {1} cannot answer stop reason", GetID(), 253 StateAsCString(m_state)); 254 return false; 255 } 256 llvm_unreachable("unhandled StateType!"); 257 } 258 259 NativeRegisterContextNetBSD &NativeThreadNetBSD::GetRegisterContext() { 260 assert(m_reg_context_up); 261 return *m_reg_context_up; 262 } 263 264 Status NativeThreadNetBSD::SetWatchpoint(lldb::addr_t addr, size_t size, 265 uint32_t watch_flags, bool hardware) { 266 assert(m_state == eStateStopped); 267 if (!hardware) 268 return Status("not implemented"); 269 Status error = RemoveWatchpoint(addr); 270 if (error.Fail()) 271 return error; 272 uint32_t wp_index = 273 GetRegisterContext().SetHardwareWatchpoint(addr, size, watch_flags); 274 if (wp_index == LLDB_INVALID_INDEX32) 275 return Status("Setting hardware watchpoint failed."); 276 m_watchpoint_index_map.insert({addr, wp_index}); 277 return Status(); 278 } 279 280 Status NativeThreadNetBSD::RemoveWatchpoint(lldb::addr_t addr) { 281 auto wp = m_watchpoint_index_map.find(addr); 282 if (wp == m_watchpoint_index_map.end()) 283 return Status(); 284 uint32_t wp_index = wp->second; 285 m_watchpoint_index_map.erase(wp); 286 if (GetRegisterContext().ClearHardwareWatchpoint(wp_index)) 287 return Status(); 288 return Status("Clearing hardware watchpoint failed."); 289 } 290 291 Status NativeThreadNetBSD::SetHardwareBreakpoint(lldb::addr_t addr, 292 size_t size) { 293 assert(m_state == eStateStopped); 294 Status error = RemoveHardwareBreakpoint(addr); 295 if (error.Fail()) 296 return error; 297 298 uint32_t bp_index = GetRegisterContext().SetHardwareBreakpoint(addr, size); 299 300 if (bp_index == LLDB_INVALID_INDEX32) 301 return Status("Setting hardware breakpoint failed."); 302 303 m_hw_break_index_map.insert({addr, bp_index}); 304 return Status(); 305 } 306 307 Status NativeThreadNetBSD::RemoveHardwareBreakpoint(lldb::addr_t addr) { 308 auto bp = m_hw_break_index_map.find(addr); 309 if (bp == m_hw_break_index_map.end()) 310 return Status(); 311 312 uint32_t bp_index = bp->second; 313 if (GetRegisterContext().ClearHardwareBreakpoint(bp_index)) { 314 m_hw_break_index_map.erase(bp); 315 return Status(); 316 } 317 318 return Status("Clearing hardware breakpoint failed."); 319 } 320 321 llvm::Error 322 NativeThreadNetBSD::CopyWatchpointsFrom(NativeThreadNetBSD &source) { 323 llvm::Error s = GetRegisterContext().CopyHardwareWatchpointsFrom( 324 source.GetRegisterContext()); 325 if (!s) { 326 m_watchpoint_index_map = source.m_watchpoint_index_map; 327 m_hw_break_index_map = source.m_hw_break_index_map; 328 } 329 return s; 330 } 331