1 files changed, 329 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp b/contrib/llvm-project/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp
new file mode 100644
index 000000000000..77b4301ea22e
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp
@@ -0,0 +1,329 @@
+//===-- NativeThreadNetBSD.cpp --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "NativeThreadNetBSD.h"
+#include "NativeRegisterContextNetBSD.h"
+
+#include "NativeProcessNetBSD.h"
+
+#include "Plugins/Process/POSIX/CrashReason.h"
+#include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
+#include "lldb/Utility/LLDBAssert.h"
+#include "lldb/Utility/RegisterValue.h"
+#include "lldb/Utility/State.h"
+#include "llvm/Support/Errno.h"
+
+// clang-format off
+#include <sys/types.h>
+#include <sys/ptrace.h>
+// clang-format on
+
+#include <sstream>
+
+// clang-format off
+#include <sys/types.h>
+#include <sys/sysctl.h>
+// clang-format on
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_netbsd;
+
+NativeThreadNetBSD::NativeThreadNetBSD(NativeProcessNetBSD &process,
+                                       lldb::tid_t tid)
+    : NativeThreadProtocol(process, tid), m_state(StateType::eStateInvalid),
+      m_stop_info(), m_reg_context_up(
+NativeRegisterContextNetBSD::CreateHostNativeRegisterContextNetBSD(process.GetArchitecture(), *this)
+), m_stop_description() {}
+
+Status NativeThreadNetBSD::Resume() {
+  Status ret = NativeProcessNetBSD::PtraceWrapper(PT_RESUME, m_process.GetID(),
+                                                  nullptr, GetID());
+  if (!ret.Success())
+    return ret;
+  ret = NativeProcessNetBSD::PtraceWrapper(PT_CLEARSTEP, m_process.GetID(),
+                                           nullptr, GetID());
+  if (ret.Success())
+    SetRunning();
+  return ret;
+}
+
+Status NativeThreadNetBSD::SingleStep() {
+  Status ret = NativeProcessNetBSD::PtraceWrapper(PT_RESUME, m_process.GetID(),
+                                                  nullptr, GetID());
+  if (!ret.Success())
+    return ret;
+  ret = NativeProcessNetBSD::PtraceWrapper(PT_SETSTEP, m_process.GetID(),
+                                           nullptr, GetID());
+  if (ret.Success())
+    SetStepping();
+  return ret;
+}
+
+Status NativeThreadNetBSD::Suspend() {
+  Status ret = NativeProcessNetBSD::PtraceWrapper(PT_SUSPEND, m_process.GetID(),
+                                                  nullptr, GetID());
+  if (ret.Success())
+    SetStopped();
+  return ret;
+}
+
+void NativeThreadNetBSD::SetStoppedBySignal(uint32_t signo,
+                                            const siginfo_t *info) {
+  Log *log = GetLog(POSIXLog::Thread);
+  LLDB_LOG(log, "tid = {0} in called with signal {1}", GetID(), signo);
+
+  SetStopped();
+
+  m_stop_info.reason = StopReason::eStopReasonSignal;
+  m_stop_info.signo = signo;
+
+  m_stop_description.clear();
+  if (info) {
+    switch (signo) {
+    case SIGSEGV:
+    case SIGBUS:
+    case SIGFPE:
+    case SIGILL:
+      m_stop_description = GetCrashReasonString(*info);
+      break;
+    }
+  }
+}
+
+void NativeThreadNetBSD::SetStoppedByBreakpoint() {
+  SetStopped();
+  m_stop_info.reason = StopReason::eStopReasonBreakpoint;
+  m_stop_info.signo = SIGTRAP;
+}
+
+void NativeThreadNetBSD::SetStoppedByTrace() {
+  SetStopped();
+  m_stop_info.reason = StopReason::eStopReasonTrace;
+  m_stop_info.signo = SIGTRAP;
+}
+
+void NativeThreadNetBSD::SetStoppedByExec() {
+  SetStopped();
+  m_stop_info.reason = StopReason::eStopReasonExec;
+  m_stop_info.signo = SIGTRAP;
+}
+
+void NativeThreadNetBSD::SetStoppedByWatchpoint(uint32_t wp_index) {
+  lldbassert(wp_index != LLDB_INVALID_INDEX32 && "wp_index cannot be invalid");
+
+  std::ostringstream ostr;
+  ostr << GetRegisterContext().GetWatchpointAddress(wp_index) << " ";
+  ostr << wp_index;
+
+  ostr << " " << GetRegisterContext().GetWatchpointHitAddress(wp_index);
+
+  SetStopped();
+  m_stop_description = ostr.str();
+  m_stop_info.reason = StopReason::eStopReasonWatchpoint;
+  m_stop_info.signo = SIGTRAP;
+}
+
+void NativeThreadNetBSD::SetStoppedByFork(lldb::pid_t child_pid,
+                                           lldb::tid_t child_tid) {
+  SetStopped();
+
+  m_stop_info.reason = StopReason::eStopReasonFork;
+  m_stop_info.signo = SIGTRAP;
+  m_stop_info.details.fork.child_pid = child_pid;
+  m_stop_info.details.fork.child_tid = child_tid;
+}
+
+void NativeThreadNetBSD::SetStoppedByVFork(lldb::pid_t child_pid,
+                                            lldb::tid_t child_tid) {
+  SetStopped();
+
+  m_stop_info.reason = StopReason::eStopReasonVFork;
+  m_stop_info.signo = SIGTRAP;
+  m_stop_info.details.fork.child_pid = child_pid;
+  m_stop_info.details.fork.child_tid = child_tid;
+}
+
+void NativeThreadNetBSD::SetStoppedByVForkDone() {
+  SetStopped();
+
+  m_stop_info.reason = StopReason::eStopReasonVForkDone;
+  m_stop_info.signo = SIGTRAP;
+}
+
+void NativeThreadNetBSD::SetStoppedWithNoReason() {
+  SetStopped();
+
+  m_stop_info.reason = StopReason::eStopReasonNone;
+  m_stop_info.signo = 0;
+}
+
+void NativeThreadNetBSD::SetStopped() {
+  const StateType new_state = StateType::eStateStopped;
+  m_state = new_state;
+  m_stop_description.clear();
+}
+
+void NativeThreadNetBSD::SetRunning() {
+  m_state = StateType::eStateRunning;
+  m_stop_info.reason = StopReason::eStopReasonNone;
+}
+
+void NativeThreadNetBSD::SetStepping() {
+  m_state = StateType::eStateStepping;
+  m_stop_info.reason = StopReason::eStopReasonNone;
+}
+
+std::string NativeThreadNetBSD::GetName() {
+#ifdef PT_LWPSTATUS
+  struct ptrace_lwpstatus info = {};
+  info.pl_lwpid = m_tid;
+  Status error = NativeProcessNetBSD::PtraceWrapper(
+      PT_LWPSTATUS, static_cast<int>(m_process.GetID()), &info, sizeof(info));
+  if (error.Fail()) {
+    return "";
+  }
+  return info.pl_name;
+#else
+  std::vector<struct kinfo_lwp> infos;
+  Log *log = GetLog(POSIXLog::Thread);
+
+  int mib[5] = {CTL_KERN, KERN_LWP, static_cast<int>(m_process.GetID()),
+                sizeof(struct kinfo_lwp), 0};
+  size_t size;
+
+  if (::sysctl(mib, 5, nullptr, &size, nullptr, 0) == -1 || size == 0) {
+    LLDB_LOG(log, "sysctl() for LWP info size failed: {0}",
+             llvm::sys::StrError());
+    return "";
+  }
+
+  mib[4] = size / sizeof(size_t);
+  infos.resize(size / sizeof(struct kinfo_lwp));
+
+  if (sysctl(mib, 5, infos.data(), &size, NULL, 0) == -1 || size == 0) {
+    LLDB_LOG(log, "sysctl() for LWP info failed: {0}", llvm::sys::StrError());
+    return "";
+  }
+
+  size_t nlwps = size / sizeof(struct kinfo_lwp);
+  for (size_t i = 0; i < nlwps; i++) {
+    if (static_cast<lldb::tid_t>(infos[i].l_lid) == m_tid) {
+      return infos[i].l_name;
+    }
+  }
+
+  LLDB_LOG(log, "unable to find lwp {0} in LWP infos", m_tid);
+  return "";
+#endif
+}
+
+lldb::StateType NativeThreadNetBSD::GetState() { return m_state; }
+
+bool NativeThreadNetBSD::GetStopReason(ThreadStopInfo &stop_info,
+                                       std::string &description) {
+  Log *log = GetLog(POSIXLog::Thread);
+  description.clear();
+
+  switch (m_state) {
+  case eStateStopped:
+  case eStateCrashed:
+  case eStateExited:
+  case eStateSuspended:
+  case eStateUnloaded:
+    stop_info = m_stop_info;
+    description = m_stop_description;
+
+    return true;
+
+  case eStateInvalid:
+  case eStateConnected:
+  case eStateAttaching:
+  case eStateLaunching:
+  case eStateRunning:
+  case eStateStepping:
+  case eStateDetached:
+    LLDB_LOG(log, "tid = {0} in state {1} cannot answer stop reason", GetID(),
+             StateAsCString(m_state));
+    return false;
+  }
+  llvm_unreachable("unhandled StateType!");
+}
+
+NativeRegisterContextNetBSD &NativeThreadNetBSD::GetRegisterContext() {
+  assert(m_reg_context_up);
+  return *m_reg_context_up;
+}
+
+Status NativeThreadNetBSD::SetWatchpoint(lldb::addr_t addr, size_t size,
+                                         uint32_t watch_flags, bool hardware) {
+  assert(m_state == eStateStopped);
+  if (!hardware)
+    return Status("not implemented");
+  Status error = RemoveWatchpoint(addr);
+  if (error.Fail())
+    return error;
+  uint32_t wp_index =
+      GetRegisterContext().SetHardwareWatchpoint(addr, size, watch_flags);
+  if (wp_index == LLDB_INVALID_INDEX32)
+    return Status("Setting hardware watchpoint failed.");
+  m_watchpoint_index_map.insert({addr, wp_index});
+  return Status();
+}
+
+Status NativeThreadNetBSD::RemoveWatchpoint(lldb::addr_t addr) {
+  auto wp = m_watchpoint_index_map.find(addr);
+  if (wp == m_watchpoint_index_map.end())
+    return Status();
+  uint32_t wp_index = wp->second;
+  m_watchpoint_index_map.erase(wp);
+  if (GetRegisterContext().ClearHardwareWatchpoint(wp_index))
+    return Status();
+  return Status("Clearing hardware watchpoint failed.");
+}
+
+Status NativeThreadNetBSD::SetHardwareBreakpoint(lldb::addr_t addr,
+                                                 size_t size) {
+  assert(m_state == eStateStopped);
+  Status error = RemoveHardwareBreakpoint(addr);
+  if (error.Fail())
+    return error;
+
+  uint32_t bp_index = GetRegisterContext().SetHardwareBreakpoint(addr, size);
+
+  if (bp_index == LLDB_INVALID_INDEX32)
+    return Status("Setting hardware breakpoint failed.");
+
+  m_hw_break_index_map.insert({addr, bp_index});
+  return Status();
+}
+
+Status NativeThreadNetBSD::RemoveHardwareBreakpoint(lldb::addr_t addr) {
+  auto bp = m_hw_break_index_map.find(addr);
+  if (bp == m_hw_break_index_map.end())
+    return Status();
+
+  uint32_t bp_index = bp->second;
+  if (GetRegisterContext().ClearHardwareBreakpoint(bp_index)) {
+    m_hw_break_index_map.erase(bp);
+    return Status();
+  }
+
+  return Status("Clearing hardware breakpoint failed.");
+}
+
+llvm::Error
+NativeThreadNetBSD::CopyWatchpointsFrom(NativeThreadNetBSD &source) {
+  llvm::Error s = GetRegisterContext().CopyHardwareWatchpointsFrom(
+      source.GetRegisterContext());
+  if (!s) {
+    m_watchpoint_index_map = source.m_watchpoint_index_map;
+    m_hw_break_index_map = source.m_hw_break_index_map;
+  }
+  return s;
+}