Status ProcessFreeBSD::GetWatchpointSupportInfo(uint32_t &num) {
Status error;
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(0, false).get());
if (thread)
num = thread->NumSupportedHardwareWatchpoints();
else
error.SetErrorString("Process does not exist.");
return error;
}
Status ProcessFreeBSD::EnableWatchpoint(Watchpoint *wp, bool notify) {
Status error;
if (wp) {
user_id_t watchID = wp->GetID();
addr_t addr = wp->GetLoadAddress();
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_WATCHPOINTS));
if (log)
log->Printf("ProcessFreeBSD::EnableWatchpoint(watchID = %" PRIu64 ")",
watchID);
if (wp->IsEnabled()) {
if (log)
log->Printf("ProcessFreeBSD::EnableWatchpoint(watchID = %" PRIu64
") addr = 0x%8.8" PRIx64 ": watchpoint already enabled.",
watchID, (uint64_t)addr);
return error;
}
// Try to find a vacant watchpoint slot in the inferiors' main thread
uint32_t wp_hw_index = LLDB_INVALID_INDEX32;
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(0, false).get());
if (thread)
wp_hw_index = thread->FindVacantWatchpointIndex();
if (wp_hw_index == LLDB_INVALID_INDEX32) {
error.SetErrorString("Setting hardware watchpoint failed.");
} else {
wp->SetHardwareIndex(wp_hw_index);
bool wp_enabled = true;
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i) {
thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(i, false).get());
if (thread)
wp_enabled &= thread->EnableHardwareWatchpoint(wp);
else
wp_enabled = false;
}
if (wp_enabled) {
wp->SetEnabled(true, notify);
return error;
} else {
// Watchpoint enabling failed on at least one of the threads so roll
// back all of them
DisableWatchpoint(wp, false);
error.SetErrorString("Setting hardware watchpoint failed");
}
}
} else
error.SetErrorString("Watchpoint argument was NULL.");
return error;
}
Status ProcessFreeBSD::SetupSoftwareSingleStepping(lldb::tid_t tid) {
std::unique_ptr<EmulateInstruction> emulator_ap(
EmulateInstruction::FindPlugin(GetTarget().GetArchitecture(),
eInstructionTypePCModifying, nullptr));
if (emulator_ap == nullptr)
return Status("Instruction emulator not found!");
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.FindThreadByID(tid, false).get());
if (thread == NULL)
return Status("Thread not found not found!");
lldb::RegisterContextSP register_context_sp = thread->GetRegisterContext();
EmulatorBaton baton(this, register_context_sp.get());
emulator_ap->SetBaton(&baton);
emulator_ap->SetReadMemCallback(&ReadMemoryCallback);
emulator_ap->SetReadRegCallback(&ReadRegisterCallback);
emulator_ap->SetWriteMemCallback(&WriteMemoryCallback);
emulator_ap->SetWriteRegCallback(&WriteRegisterCallback);
if (!emulator_ap->ReadInstruction())
return Status("Read instruction failed!");
bool emulation_result =
emulator_ap->EvaluateInstruction(eEmulateInstructionOptionAutoAdvancePC);
const RegisterInfo *reg_info_pc = register_context_sp->GetRegisterInfo(
eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
auto pc_it =
baton.m_register_values.find(reg_info_pc->kinds[eRegisterKindDWARF]);
lldb::addr_t next_pc;
if (emulation_result) {
assert(pc_it != baton.m_register_values.end() &&
"Emulation was successful but PC wasn't updated");
next_pc = pc_it->second.GetAsUInt64();
} else if (pc_it == baton.m_register_values.end()) {
// Emulate instruction failed and it haven't changed PC. Advance PC with
// the size of the current opcode because the emulation of all
// PC modifying instruction should be successful. The failure most
// likely caused by a not supported instruction which don't modify PC.
next_pc =
register_context_sp->GetPC() + emulator_ap->GetOpcode().GetByteSize();
} else {
// The instruction emulation failed after it modified the PC. It is an
// unknown error where we can't continue because the next instruction is
// modifying the PC but we don't know how.
return Status("Instruction emulation failed unexpectedly");
}
SetSoftwareSingleStepBreakpoint(tid, next_pc);
return Status();
}
Error
ProcessFreeBSD::GetWatchpointSupportInfo(uint32_t &num)
{
Error error;
Mutex::Locker lock(m_thread_list.GetMutex());
FreeBSDThread *thread = static_cast<FreeBSDThread*>(
m_thread_list.GetThreadAtIndex(0, false).get());
if (thread)
num = thread->NumSupportedHardwareWatchpoints();
else
error.SetErrorString("Process does not exist.");
return error;
}
Error
ProcessFreeBSD::DisableWatchpoint(Watchpoint *wp, bool notify)
{
Error error;
if (wp)
{
user_id_t watchID = wp->GetID();
addr_t addr = wp->GetLoadAddress();
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_WATCHPOINTS));
if (log)
log->Printf("ProcessFreeBSD::DisableWatchpoint(watchID = %" PRIu64 ")",
watchID);
if (!wp->IsEnabled())
{
if (log)
log->Printf("ProcessFreeBSD::DisableWatchpoint(watchID = %" PRIu64
") addr = 0x%8.8" PRIx64 ": watchpoint already disabled.",
watchID, (uint64_t)addr);
// This is needed (for now) to keep watchpoints disabled correctly
wp->SetEnabled(false, notify);
return error;
}
if (wp->IsHardware())
{
bool wp_disabled = true;
Mutex::Locker lock(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i)
{
FreeBSDThread *thread = static_cast<FreeBSDThread*>(
m_thread_list.GetThreadAtIndex(i, false).get());
if (thread)
wp_disabled &= thread->DisableHardwareWatchpoint(wp);
else
wp_disabled = false;
}
if (wp_disabled)
{
wp->SetHardwareIndex(LLDB_INVALID_INDEX32);
wp->SetEnabled(false, notify);
return error;
}
else
error.SetErrorString("Disabling hardware watchpoint failed");
}
}
else
error.SetErrorString("Watchpoint argument was NULL.");
return error;
}
bool ProcessFreeBSD::IsAThreadRunning() {
bool is_running = false;
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i) {
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(i, false).get());
StateType thread_state = thread->GetState();
if (thread_state == eStateRunning || thread_state == eStateStepping) {
is_running = true;
break;
}
}
return is_running;
}
void ProcessFreeBSD::RefreshStateAfterStop() {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
if (log && log->GetMask().Test(POSIX_LOG_VERBOSE))
log->Printf("ProcessFreeBSD::%s(), message_queue size = %d", __FUNCTION__,
(int)m_message_queue.size());
std::lock_guard<std::recursive_mutex> guard(m_message_mutex);
// This method used to only handle one message. Changing it to loop allows
// it to handle the case where we hit a breakpoint while handling a different
// breakpoint.
while (!m_message_queue.empty()) {
ProcessMessage &message = m_message_queue.front();
// Resolve the thread this message corresponds to and pass it along.
lldb::tid_t tid = message.GetTID();
if (log)
log->Printf(
"ProcessFreeBSD::%s(), message_queue size = %d, pid = %" PRIi64,
__FUNCTION__, (int)m_message_queue.size(), tid);
m_thread_list.RefreshStateAfterStop();
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
GetThreadList().FindThreadByID(tid, false).get());
if (thread)
thread->Notify(message);
if (message.GetKind() == ProcessMessage::eExitMessage) {
// FIXME: We should tell the user about this, but the limbo message is
// probably better for that.
if (log)
log->Printf("ProcessFreeBSD::%s() removing thread, tid = %" PRIi64,
__FUNCTION__, tid);
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
ThreadSP thread_sp = m_thread_list.RemoveThreadByID(tid, false);
thread_sp.reset();
m_seen_initial_stop.erase(tid);
}
m_message_queue.pop();
}
}
