diff options
Diffstat (limited to 'lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp')
-rw-r--r-- | lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp | 333 |
1 files changed, 236 insertions, 97 deletions
diff --git a/lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp b/lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp index 8b6f9fbc33c3..4313d27e11e9 100644 --- a/lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp +++ b/lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp @@ -8,8 +8,7 @@ #include "NativeProcessNetBSD.h" - - +#include "Plugins/Process/NetBSD/NativeRegisterContextNetBSD.h" #include "Plugins/Process/POSIX/ProcessPOSIXLog.h" #include "lldb/Host/HostProcess.h" #include "lldb/Host/common/NativeRegisterContext.h" @@ -99,6 +98,17 @@ NativeProcessNetBSD::Factory::Launch(ProcessLaunchInfo &launch_info, pid, launch_info.GetPTY().ReleaseMasterFileDescriptor(), native_delegate, Info.GetArchitecture(), mainloop)); + // Enable event reporting + ptrace_event_t events; + status = PtraceWrapper(PT_GET_EVENT_MASK, pid, &events, sizeof(events)); + if (status.Fail()) + return status.ToError(); + // TODO: PTRACE_FORK | PTRACE_VFORK | PTRACE_POSIX_SPAWN? + events.pe_set_event |= PTRACE_LWP_CREATE | PTRACE_LWP_EXIT; + status = PtraceWrapper(PT_SET_EVENT_MASK, pid, &events, sizeof(events)); + if (status.Fail()) + return status.ToError(); + status = process_up->ReinitializeThreads(); if (status.Fail()) return status.ToError(); @@ -211,17 +221,32 @@ void NativeProcessNetBSD::MonitorSIGTRAP(lldb::pid_t pid) { return; } + NativeThreadNetBSD* thread = nullptr; + if (info.psi_lwpid > 0) { + for (const auto &t : m_threads) { + if (t->GetID() == static_cast<lldb::tid_t>(info.psi_lwpid)) { + thread = static_cast<NativeThreadNetBSD *>(t.get()); + break; + } + static_cast<NativeThreadNetBSD *>(t.get())->SetStoppedWithNoReason(); + } + if (!thread) + LLDB_LOG(log, + "thread not found in m_threads, pid = {0}, LWP = {1}", pid, + info.psi_lwpid); + } + switch (info.psi_siginfo.si_code) { case TRAP_BRKPT: - for (const auto &thread : m_threads) { - static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByBreakpoint(); - FixupBreakpointPCAsNeeded(static_cast<NativeThreadNetBSD &>(*thread)); + if (thread) { + thread->SetStoppedByBreakpoint(); + FixupBreakpointPCAsNeeded(*thread); } SetState(StateType::eStateStopped, true); break; case TRAP_TRACE: - for (const auto &thread : m_threads) - static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByTrace(); + if (thread) + thread->SetStoppedByTrace(); SetState(StateType::eStateStopped, true); break; case TRAP_EXEC: { @@ -238,54 +263,66 @@ void NativeProcessNetBSD::MonitorSIGTRAP(lldb::pid_t pid) { static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByExec(); SetState(StateType::eStateStopped, true); } break; - case TRAP_DBREG: { - // Find the thread. - NativeThreadNetBSD* thread = nullptr; - for (const auto &t : m_threads) { - if (t->GetID() == info.psi_lwpid) { - thread = static_cast<NativeThreadNetBSD *>(t.get()); + case TRAP_LWP: { + ptrace_state_t pst; + Status error = PtraceWrapper(PT_GET_PROCESS_STATE, pid, &pst, sizeof(pst)); + if (error.Fail()) { + SetState(StateType::eStateInvalid); + return; + } + + switch (pst.pe_report_event) { + case PTRACE_LWP_CREATE: { + LLDB_LOG(log, + "monitoring new thread, pid = {0}, LWP = {1}", pid, + pst.pe_lwp); + NativeThreadNetBSD& t = AddThread(pst.pe_lwp); + error = t.CopyWatchpointsFrom( + static_cast<NativeThreadNetBSD &>(*GetCurrentThread())); + if (error.Fail()) { + LLDB_LOG(log, + "failed to copy watchpoints to new thread {0}: {1}", + pst.pe_lwp, error); + SetState(StateType::eStateInvalid); + return; + } + } break; + case PTRACE_LWP_EXIT: + LLDB_LOG(log, + "removing exited thread, pid = {0}, LWP = {1}", pid, + pst.pe_lwp); + RemoveThread(pst.pe_lwp); break; - } } - if (!thread) { - LLDB_LOG(log, - "thread not found in m_threads, pid = {0}, LWP = {1}", - GetID(), info.psi_lwpid); - break; + + error = PtraceWrapper(PT_CONTINUE, pid, reinterpret_cast<void*>(1), 0); + if (error.Fail()) { + SetState(StateType::eStateInvalid); + return; } + } break; + case TRAP_DBREG: { + if (!thread) + break; - // If a watchpoint was hit, report it + auto ®ctx = static_cast<NativeRegisterContextNetBSD &>( + thread->GetRegisterContext()); uint32_t wp_index = LLDB_INVALID_INDEX32; - Status error = thread->GetRegisterContext().GetWatchpointHitIndex( - wp_index, (uintptr_t)info.psi_siginfo.si_addr); + Status error = regctx.GetWatchpointHitIndex(wp_index, + (uintptr_t)info.psi_siginfo.si_addr); if (error.Fail()) LLDB_LOG(log, "received error while checking for watchpoint hits, pid = " - "{0}, LWP = {1}, error = {2}", - GetID(), info.psi_lwpid, error); + "{0}, LWP = {1}, error = {2}", pid, info.psi_lwpid, error); if (wp_index != LLDB_INVALID_INDEX32) { - for (const auto &thread : m_threads) - static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByWatchpoint( - wp_index); + thread->SetStoppedByWatchpoint(wp_index); + regctx.ClearWatchpointHit(wp_index); SetState(StateType::eStateStopped, true); break; } - // If a breakpoint was hit, report it - uint32_t bp_index = LLDB_INVALID_INDEX32; - error = thread->GetRegisterContext().GetHardwareBreakHitIndex( - bp_index, (uintptr_t)info.psi_siginfo.si_addr); - if (error.Fail()) - LLDB_LOG(log, - "received error while checking for hardware " - "breakpoint hits, pid = {0}, LWP = {1}, error = {2}", - GetID(), info.psi_lwpid, error); - if (bp_index != LLDB_INVALID_INDEX32) { - for (const auto &thread : m_threads) - static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByBreakpoint(); - SetState(StateType::eStateStopped, true); - break; - } + thread->SetStoppedByTrace(); + SetState(StateType::eStateStopped, true); } break; } } @@ -295,9 +332,14 @@ void NativeProcessNetBSD::MonitorSignal(lldb::pid_t pid, int signal) { const auto siginfo_err = PtraceWrapper(PT_GET_SIGINFO, pid, &info, sizeof(info)); - for (const auto &thread : m_threads) { - static_cast<NativeThreadNetBSD &>(*thread).SetStoppedBySignal( - info.psi_siginfo.si_signo, &info.psi_siginfo); + for (const auto &abs_thread : m_threads) { + NativeThreadNetBSD &thread = static_cast<NativeThreadNetBSD &>(*abs_thread); + assert(info.psi_lwpid >= 0); + if (info.psi_lwpid == 0 || + static_cast<lldb::tid_t>(info.psi_lwpid) == thread.GetID()) + thread.SetStoppedBySignal(info.psi_siginfo.si_signo, &info.psi_siginfo); + else + thread.SetStoppedWithNoReason(); } SetState(StateType::eStateStopped, true); } @@ -325,68 +367,137 @@ Status NativeProcessNetBSD::PtraceWrapper(int req, lldb::pid_t pid, void *addr, return error; } +static llvm::Expected<ptrace_siginfo_t> ComputeSignalInfo( + const std::vector<std::unique_ptr<NativeThreadProtocol>> &threads, + const ResumeActionList &resume_actions) { + // We need to account for three possible scenarios: + // 1. no signal being sent. + // 2. a signal being sent to one thread. + // 3. a signal being sent to the whole process. + + // Count signaled threads. While at it, determine which signal is being sent + // and ensure there's only one. + size_t signaled_threads = 0; + int signal = LLDB_INVALID_SIGNAL_NUMBER; + lldb::tid_t signaled_lwp; + for (const auto &thread : threads) { + assert(thread && "thread list should not contain NULL threads"); + const ResumeAction *action = + resume_actions.GetActionForThread(thread->GetID(), true); + if (action) { + if (action->signal != LLDB_INVALID_SIGNAL_NUMBER) { + signaled_threads++; + if (action->signal != signal) { + if (signal != LLDB_INVALID_SIGNAL_NUMBER) + return Status("NetBSD does not support passing multiple signals " + "simultaneously") + .ToError(); + signal = action->signal; + signaled_lwp = thread->GetID(); + } + } + } + } + + if (signaled_threads == 0) { + ptrace_siginfo_t siginfo; + siginfo.psi_siginfo.si_signo = LLDB_INVALID_SIGNAL_NUMBER; + return siginfo; + } + + if (signaled_threads > 1 && signaled_threads < threads.size()) + return Status("NetBSD does not support passing signal to 1<i<all threads") + .ToError(); + + ptrace_siginfo_t siginfo; + siginfo.psi_siginfo.si_signo = signal; + siginfo.psi_siginfo.si_code = SI_USER; + siginfo.psi_siginfo.si_pid = getpid(); + siginfo.psi_siginfo.si_uid = getuid(); + if (signaled_threads == 1) + siginfo.psi_lwpid = signaled_lwp; + else // signal for the whole process + siginfo.psi_lwpid = 0; + return siginfo; +} + Status NativeProcessNetBSD::Resume(const ResumeActionList &resume_actions) { Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS)); LLDB_LOG(log, "pid {0}", GetID()); - const auto &thread = m_threads[0]; - const ResumeAction *const action = - resume_actions.GetActionForThread(thread->GetID(), true); + Status ret; - if (action == nullptr) { - LLDB_LOG(log, "no action specified for pid {0} tid {1}", GetID(), - thread->GetID()); - return Status(); - } + Expected<ptrace_siginfo_t> siginfo = + ComputeSignalInfo(m_threads, resume_actions); + if (!siginfo) + return Status(siginfo.takeError()); - Status error; - int signal = - action->signal != LLDB_INVALID_SIGNAL_NUMBER ? action->signal : 0; - - switch (action->state) { - case eStateRunning: { - // Run the thread, possibly feeding it the signal. - error = NativeProcessNetBSD::PtraceWrapper(PT_CONTINUE, GetID(), (void *)1, - signal); - if (!error.Success()) - return error; - for (const auto &thread : m_threads) - static_cast<NativeThreadNetBSD &>(*thread).SetRunning(); - SetState(eStateRunning, true); - break; - } - case eStateStepping: - // Run the thread, possibly feeding it the signal. - error = NativeProcessNetBSD::PtraceWrapper(PT_STEP, GetID(), (void *)1, - signal); - if (!error.Success()) - return error; - for (const auto &thread : m_threads) - static_cast<NativeThreadNetBSD &>(*thread).SetStepping(); - SetState(eStateStepping, true); - break; + for (const auto &abs_thread : m_threads) { + assert(abs_thread && "thread list should not contain NULL threads"); + NativeThreadNetBSD &thread = static_cast<NativeThreadNetBSD &>(*abs_thread); - case eStateSuspended: - case eStateStopped: - llvm_unreachable("Unexpected state"); + const ResumeAction *action = + resume_actions.GetActionForThread(thread.GetID(), true); + // we need to explicit issue suspend requests, so it is simpler to map it + // into proper action + ResumeAction suspend_action{thread.GetID(), eStateSuspended, + LLDB_INVALID_SIGNAL_NUMBER}; - default: - return Status("NativeProcessNetBSD::%s (): unexpected state %s specified " - "for pid %" PRIu64 ", tid %" PRIu64, - __FUNCTION__, StateAsCString(action->state), GetID(), - thread->GetID()); + if (action == nullptr) { + LLDB_LOG(log, "no action specified for pid {0} tid {1}", GetID(), + thread.GetID()); + action = &suspend_action; + } + + LLDB_LOG( + log, + "processing resume action state {0} signal {1} for pid {2} tid {3}", + action->state, action->signal, GetID(), thread.GetID()); + + switch (action->state) { + case eStateRunning: + ret = thread.Resume(); + break; + case eStateStepping: + ret = thread.SingleStep(); + break; + case eStateSuspended: + case eStateStopped: + if (action->signal != LLDB_INVALID_SIGNAL_NUMBER) + return Status("Passing signal to suspended thread unsupported"); + + ret = thread.Suspend(); + break; + + default: + return Status("NativeProcessNetBSD::%s (): unexpected state %s specified " + "for pid %" PRIu64 ", tid %" PRIu64, + __FUNCTION__, StateAsCString(action->state), GetID(), + thread.GetID()); + } + + if (!ret.Success()) + return ret; } - return Status(); + int signal = 0; + if (siginfo->psi_siginfo.si_signo != LLDB_INVALID_SIGNAL_NUMBER) { + ret = PtraceWrapper(PT_SET_SIGINFO, GetID(), &siginfo.get(), + sizeof(*siginfo)); + if (!ret.Success()) + return ret; + signal = siginfo->psi_siginfo.si_signo; + } + + ret = PtraceWrapper(PT_CONTINUE, GetID(), reinterpret_cast<void *>(1), + signal); + if (ret.Success()) + SetState(eStateRunning, true); + return ret; } Status NativeProcessNetBSD::Halt() { - Status error; - - if (kill(GetID(), SIGSTOP) != 0) - error.SetErrorToErrno(); - - return error; + return PtraceWrapper(PT_STOP, GetID()); } Status NativeProcessNetBSD::Detach() { @@ -411,6 +522,10 @@ Status NativeProcessNetBSD::Signal(int signo) { return error; } +Status NativeProcessNetBSD::Interrupt() { + return PtraceWrapper(PT_STOP, GetID()); +} + Status NativeProcessNetBSD::Kill() { Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS)); LLDB_LOG(log, "pid {0}", GetID()); @@ -650,10 +765,10 @@ bool NativeProcessNetBSD::HasThreadNoLock(lldb::tid_t thread_id) { } NativeThreadNetBSD &NativeProcessNetBSD::AddThread(lldb::tid_t thread_id) { - Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD)); LLDB_LOG(log, "pid {0} adding thread with tid {1}", GetID(), thread_id); + assert(thread_id > 0); assert(!HasThreadNoLock(thread_id) && "attempted to add a thread by id that already exists"); @@ -665,6 +780,22 @@ NativeThreadNetBSD &NativeProcessNetBSD::AddThread(lldb::tid_t thread_id) { return static_cast<NativeThreadNetBSD &>(*m_threads.back()); } +void NativeProcessNetBSD::RemoveThread(lldb::tid_t thread_id) { + Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD)); + LLDB_LOG(log, "pid {0} removing thread with tid {1}", GetID(), thread_id); + + assert(thread_id > 0); + assert(HasThreadNoLock(thread_id) && + "attempted to remove a thread that does not exist"); + + for (auto it = m_threads.begin(); it != m_threads.end(); ++it) { + if ((*it)->GetID() == thread_id) { + m_threads.erase(it); + break; + } + } +} + Status NativeProcessNetBSD::Attach() { // Attach to the requested process. // An attach will cause the thread to stop with a SIGSTOP. @@ -783,15 +914,23 @@ Status NativeProcessNetBSD::ReinitializeThreads() { m_threads.clear(); // Initialize new thread +#ifdef PT_LWPSTATUS + struct ptrace_lwpstatus info = {}; + int op = PT_LWPNEXT; +#else struct ptrace_lwpinfo info = {}; - Status error = PtraceWrapper(PT_LWPINFO, GetID(), &info, sizeof(info)); + int op = PT_LWPINFO; +#endif + + Status error = PtraceWrapper(op, GetID(), &info, sizeof(info)); + if (error.Fail()) { return error; } // Reinitialize from scratch threads and register them in process while (info.pl_lwpid != 0) { AddThread(info.pl_lwpid); - error = PtraceWrapper(PT_LWPINFO, GetID(), &info, sizeof(info)); + error = PtraceWrapper(op, GetID(), &info, sizeof(info)); if (error.Fail()) { return error; } |