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