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 m_stop_description = GetCrashReasonString(*info); 94 break; 95 } 96 } 97 } 98 99 void NativeThreadNetBSD::SetStoppedByBreakpoint() { 100 SetStopped(); 101 m_stop_info.reason = StopReason::eStopReasonBreakpoint; 102 m_stop_info.signo = SIGTRAP; 103 } 104 105 void NativeThreadNetBSD::SetStoppedByTrace() { 106 SetStopped(); 107 m_stop_info.reason = StopReason::eStopReasonTrace; 108 m_stop_info.signo = SIGTRAP; 109 } 110 111 void NativeThreadNetBSD::SetStoppedByExec() { 112 SetStopped(); 113 m_stop_info.reason = StopReason::eStopReasonExec; 114 m_stop_info.signo = SIGTRAP; 115 } 116 117 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 } 131 132 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 } 141 142 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 } 151 152 void NativeThreadNetBSD::SetStoppedByVForkDone() { 153 SetStopped(); 154 155 m_stop_info.reason = StopReason::eStopReasonVForkDone; 156 m_stop_info.signo = SIGTRAP; 157 } 158 159 void NativeThreadNetBSD::SetStoppedWithNoReason() { 160 SetStopped(); 161 162 m_stop_info.reason = StopReason::eStopReasonNone; 163 m_stop_info.signo = 0; 164 } 165 166 void NativeThreadNetBSD::SetStopped() { 167 const StateType new_state = StateType::eStateStopped; 168 m_state = new_state; 169 m_stop_description.clear(); 170 } 171 172 void NativeThreadNetBSD::SetRunning() { 173 m_state = StateType::eStateRunning; 174 m_stop_info.reason = StopReason::eStopReasonNone; 175 } 176 177 void NativeThreadNetBSD::SetStepping() { 178 m_state = StateType::eStateStepping; 179 m_stop_info.reason = StopReason::eStopReasonNone; 180 } 181 182 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 } 225 226 lldb::StateType NativeThreadNetBSD::GetState() { return m_state; } 227 228 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 } 257 258 NativeRegisterContextNetBSD &NativeThreadNetBSD::GetRegisterContext() { 259 assert(m_reg_context_up); 260 return *m_reg_context_up; 261 } 262 263 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 } 278 279 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 } 289 290 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 } 305 306 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 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