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Atmosphere/libraries/libmesosphere/source/kern_k_debug_base.cpp
Michael Scire 28aab09b5d kern: implement process exit
2020-07-31 14:50:52 -07:00

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern {
namespace {
ALWAYS_INLINE KDebugBase *GetDebugObject(KProcess *process) {
return static_cast<KDebugBase *>(process->GetDebugObject());
}
}
void KDebugBase::Initialize() {
/* Clear the process and continue flags. */
this->process = nullptr;
this->continue_flags = 0;
}
Result KDebugBase::Attach(KProcess *target) {
/* Check that the process isn't null. */
MESOSPHERE_ASSERT(target != nullptr);
/* Attach to the process. */
{
/* Lock both ourselves, the target process, and the scheduler. */
KScopedLightLock state_lk(target->GetStateLock());
KScopedLightLock list_lk(target->GetListLock());
KScopedLightLock this_lk(this->lock);
KScopedSchedulerLock sl;
/* Check that the process isn't already being debugged. */
R_UNLESS(!target->IsAttachedToDebugger(), svc::ResultBusy());
{
/* Ensure the process is in a state that allows for debugging. */
const KProcess::State state = target->GetState();
switch (state) {
case KProcess::State_Created:
case KProcess::State_Running:
case KProcess::State_Crashed:
break;
case KProcess::State_CreatedAttached:
case KProcess::State_RunningAttached:
case KProcess::State_DebugBreak:
return svc::ResultBusy();
case KProcess::State_Terminating:
case KProcess::State_Terminated:
return svc::ResultProcessTerminated();
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
}
/* Set our process member, and open a reference to the target. */
this->process = target;
this->process->Open();
/* Set ourselves as the process's attached object. */
this->old_process_state = this->process->SetDebugObject(this);
/* Send an event for our attaching to the process. */
this->PushDebugEvent(ams::svc::DebugEvent_AttachProcess);
/* Send events for attaching to each thread in the process. */
{
auto end = this->process->GetThreadList().end();
for (auto it = this->process->GetThreadList().begin(); it != end; ++it) {
/* Request that we suspend the thread. */
it->RequestSuspend(KThread::SuspendType_Debug);
/* If the thread is in a state for us to do so, generate the event. */
if (const auto thread_state = it->GetState(); thread_state == KThread::ThreadState_Runnable || thread_state == KThread::ThreadState_Waiting) {
/* Mark the thread as attached to. */
it->SetDebugAttached();
/* Send the event. */
this->PushDebugEvent(ams::svc::DebugEvent_AttachThread, it->GetId(), GetInteger(it->GetThreadLocalRegionAddress()), it->GetEntrypoint());
}
}
}
/* Send the process's jit debug info, if relevant. */
if (KEventInfo *jit_info = this->process->GetJitDebugInfo(); jit_info != nullptr) {
this->EnqueueDebugEventInfo(jit_info);
}
/* Send an exception event to represent our attaching. */
this->PushDebugEvent(ams::svc::DebugEvent_Exception, ams::svc::DebugException_DebuggerAttached);
/* Signal. */
this->NotifyAvailable();
}
}
return ResultSuccess();
}
KEventInfo *KDebugBase::CreateDebugEvent(ams::svc::DebugEvent event, uintptr_t param0, uintptr_t param1, uintptr_t param2, uintptr_t param3, uintptr_t param4, u64 cur_thread_id) {
/* Allocate a new event. */
KEventInfo *info = KEventInfo::Allocate();
/* Populate the event info. */
if (info != nullptr) {
/* Set common fields. */
info->event = event;
info->thread_id = 0;
info->flags = 1; /* TODO: enum this in ams::svc */
/* Set event specific fields. */
switch (event) {
case ams::svc::DebugEvent_AttachProcess:
{
/* ... */
}
break;
case ams::svc::DebugEvent_AttachThread:
{
/* Set the thread id. */
info->thread_id = param0;
/* Set the thread creation info. */
info->info.create_thread.thread_id = param0;
info->info.create_thread.tls_address = param1;
info->info.create_thread.entrypoint = param2;
}
break;
case ams::svc::DebugEvent_ExitProcess:
{
/* Set the exit reason. */
info->info.exit_process.reason = static_cast<ams::svc::ProcessExitReason>(param0);
/* Clear the thread id and flags. */
info->thread_id = 0;
info->flags = 0 /* TODO: enum this in ams::svc */;
}
break;
case ams::svc::DebugEvent_ExitThread:
{
/* Set the thread id. */
info->thread_id = param0;
/* Set the exit reason. */
info->info.exit_thread.reason = static_cast<ams::svc::ThreadExitReason>(param1);
}
break;
case ams::svc::DebugEvent_Exception:
{
/* Set the thread id. */
info->thread_id = cur_thread_id;
/* Set the exception type, and clear the count. */
info->info.exception.exception_type = static_cast<ams::svc::DebugException>(param0);
info->info.exception.exception_data_count = 0;
switch (static_cast<ams::svc::DebugException>(param0)) {
case ams::svc::DebugException_UndefinedInstruction:
case ams::svc::DebugException_BreakPoint:
case ams::svc::DebugException_UndefinedSystemCall:
{
info->info.exception.exception_address = param1;
info->info.exception.exception_data_count = 1;
info->info.exception.exception_data[0] = param2;
}
break;
case ams::svc::DebugException_DebuggerAttached:
{
info->thread_id = 0;
info->info.exception.exception_address = 0;
}
break;
case ams::svc::DebugException_UserBreak:
{
info->info.exception.exception_address = param1;
info->info.exception.exception_data_count = 3;
info->info.exception.exception_data[0] = param2;
info->info.exception.exception_data[1] = param3;
info->info.exception.exception_data[2] = param4;
}
break;
case ams::svc::DebugException_DebuggerBreak:
{
info->thread_id = 0;
info->info.exception.exception_address = 0;
info->info.exception.exception_data_count = 4;
info->info.exception.exception_data[0] = param1;
info->info.exception.exception_data[1] = param2;
info->info.exception.exception_data[2] = param3;
info->info.exception.exception_data[3] = param4;
}
break;
case ams::svc::DebugException_MemorySystemError:
{
info->info.exception.exception_address = 0;
}
break;
case ams::svc::DebugException_InstructionAbort:
case ams::svc::DebugException_DataAbort:
case ams::svc::DebugException_AlignmentFault:
default:
{
info->info.exception.exception_address = param1;
}
break;
}
}
break;
}
}
return info;
}
void KDebugBase::PushDebugEvent(ams::svc::DebugEvent event, uintptr_t param0, uintptr_t param1, uintptr_t param2, uintptr_t param3, uintptr_t param4) {
/* Create and enqueue and event. */
if (KEventInfo *new_info = CreateDebugEvent(event, param0, param1, param2, param3, param4, GetCurrentThread().GetId()); new_info != nullptr) {
this->EnqueueDebugEventInfo(new_info);
}
}
void KDebugBase::EnqueueDebugEventInfo(KEventInfo *info) {
/* Lock the scheduler. */
KScopedSchedulerLock sl;
/* Push the event to the back of the list. */
this->event_info_list.push_back(*info);
}
KScopedAutoObject<KProcess> KDebugBase::GetProcess() {
/* Lock ourselves. */
KScopedLightLock lk(this->lock);
return this->process;
}
Result KDebugBase::GetDebugEventInfo(ams::svc::lp64::DebugEventInfo *out) {
/* Get the attached process. */
KScopedAutoObject process = this->GetProcess();
R_UNLESS(process.IsNotNull(), svc::ResultProcessTerminated());
/* Pop an event info from our queue. */
KEventInfo *info = nullptr;
{
KScopedSchedulerLock sl;
/* Check that we have an event to dequeue. */
R_UNLESS(!this->event_info_list.empty(), svc::ResultNoEvent());
/* Pop the event from the front of the queue. */
info = std::addressof(this->event_info_list.front());
this->event_info_list.pop_front();
}
MESOSPHERE_ASSERT(info != nullptr);
/* Free the event info once we're done with it. */
ON_SCOPE_EXIT { KEventInfo::Free(info); };
/* Set common fields. */
out->type = info->event;
out->thread_id = info->thread_id;
out->flags = info->flags;
/* Set event specific fields. */
switch (info->event) {
case ams::svc::DebugEvent_AttachProcess:
{
out->info.attach_process.program_id = process->GetProgramId();
out->info.attach_process.process_id = process->GetId();
out->info.attach_process.flags = process->GetCreateProcessFlags();
out->info.attach_process.user_exception_context_address = GetInteger(process->GetProcessLocalRegionAddress());
std::memcpy(out->info.attach_process.name, process->GetName(), sizeof(out->info.attach_process.name));
}
break;
case ams::svc::DebugEvent_AttachThread:
{
out->info.attach_thread.thread_id = info->info.create_thread.thread_id;
out->info.attach_thread.tls_address = info->info.create_thread.tls_address;
out->info.attach_thread.entrypoint = info->info.create_thread.entrypoint;
}
break;
case ams::svc::DebugEvent_ExitProcess:
{
out->info.exit_process.reason = info->info.exit_process.reason;
}
break;
case ams::svc::DebugEvent_ExitThread:
{
out->info.exit_thread.reason = info->info.exit_thread.reason;
}
break;
case ams::svc::DebugEvent_Exception:
{
out->info.exception.type = info->info.exception.exception_type;
out->info.exception.address = info->info.exception.exception_address;
switch (info->info.exception.exception_type) {
case ams::svc::DebugException_UndefinedInstruction:
{
MESOSPHERE_ASSERT(info->info.exception.exception_data_count == 1);
out->info.exception.specific.undefined_instruction.insn = info->info.exception.exception_data[0];
}
break;
case ams::svc::DebugException_BreakPoint:
{
MESOSPHERE_ASSERT(info->info.exception.exception_data_count == 1);
out->info.exception.specific.break_point.type = static_cast<ams::svc::BreakPointType>(info->info.exception.exception_data[0]);
out->info.exception.specific.break_point.address = 0;
}
break;
case ams::svc::DebugException_UserBreak:
{
MESOSPHERE_ASSERT(info->info.exception.exception_data_count == 3);
out->info.exception.specific.user_break.break_reason = static_cast<ams::svc::BreakReason>(info->info.exception.exception_data[0]);
out->info.exception.specific.user_break.address = info->info.exception.exception_data[1];
out->info.exception.specific.user_break.size = info->info.exception.exception_data[2];
}
break;
case ams::svc::DebugException_DebuggerBreak:
{
MESOSPHERE_ASSERT(info->info.exception.exception_data_count == 4);
out->info.exception.specific.debugger_break.active_thread_ids[0] = info->info.exception.exception_data[0];
out->info.exception.specific.debugger_break.active_thread_ids[1] = info->info.exception.exception_data[1];
out->info.exception.specific.debugger_break.active_thread_ids[2] = info->info.exception.exception_data[2];
out->info.exception.specific.debugger_break.active_thread_ids[3] = info->info.exception.exception_data[3];
}
break;
case ams::svc::DebugException_UndefinedSystemCall:
{
MESOSPHERE_ASSERT(info->info.exception.exception_data_count == 1);
out->info.exception.specific.undefined_system_call.id = info->info.exception.exception_data[0];
}
break;
default:
{
/* ... */
}
break;
}
}
break;
}
return ResultSuccess();
}
Result KDebugBase::GetDebugEventInfo(ams::svc::ilp32::DebugEventInfo *out) {
MESOSPHERE_UNIMPLEMENTED();
}
void KDebugBase::OnFinalizeSynchronizationObject() {
/* Detach from our process, if we have one. */
{
/* Get the attached process. */
KScopedAutoObject process = this->GetProcess();
/* If the process isn't null, detach. */
if (process.IsNotNull()) {
/* When we're done detaching, clear the reference we opened when we attached. */
ON_SCOPE_EXIT { process->Close(); };
/* Detach. */
{
/* Lock both ourselves and the target process. */
KScopedLightLock state_lk(process->GetStateLock());
KScopedLightLock list_lk(process->GetListLock());
KScopedLightLock this_lk(this->lock);
/* Ensure we finalize exactly once. */
if (this->process != nullptr) {
MESOSPHERE_ASSERT(this->process == process.GetPointerUnsafe());
{
KScopedSchedulerLock sl;
/* Detach ourselves from the process. */
process->ClearDebugObject(this->old_process_state);
/* Release all threads. */
const bool resume = (process->GetState() != KProcess::State_Crashed);
{
auto end = process->GetThreadList().end();
for (auto it = process->GetThreadList().begin(); it != end; ++it) {
if (resume) {
/* If the process isn't crashed, resume threads. */
it->Resume(KThread::SuspendType_Debug);
} else {
/* Otherwise, suspend them. */
it->RequestSuspend(KThread::SuspendType_Debug);
}
}
}
/* Clear our process. */
this->process = nullptr;
}
}
}
}
}
/* Free any pending events. */
{
KScopedSchedulerLock sl;
while (!this->event_info_list.empty()) {
KEventInfo *info = std::addressof(this->event_info_list.front());
this->event_info_list.pop_front();
KEventInfo::Free(info);
}
}
}
bool KDebugBase::IsSignaled() const {
KScopedSchedulerLock sl;
return (!this->event_info_list.empty()) || this->process == nullptr || this->process->IsTerminated();
}
Result KDebugBase::ProcessDebugEvent(ams::svc::DebugEvent event, uintptr_t param0, uintptr_t param1, uintptr_t param2, uintptr_t param3, uintptr_t param4) {
MESOSPHERE_UNIMPLEMENTED();
}
Result KDebugBase::OnDebugEvent(ams::svc::DebugEvent event, uintptr_t param0, uintptr_t param1, uintptr_t param2, uintptr_t param3, uintptr_t param4) {
if (KProcess *process = GetCurrentProcessPointer(); process != nullptr && process->IsAttachedToDebugger()) {
return ProcessDebugEvent(event, param0, param1, param2, param3, param4);
}
return ResultSuccess();
}
Result KDebugBase::OnExitProcess(KProcess *process) {
MESOSPHERE_ASSERT(process != nullptr);
if (process->IsAttachedToDebugger()) {
KScopedSchedulerLock sl;
if (KDebugBase *debug = GetDebugObject(process); debug != nullptr) {
debug->PushDebugEvent(ams::svc::DebugEvent_ExitProcess, ams::svc::ProcessExitReason_ExitProcess);
debug->NotifyAvailable();
}
}
return ResultSuccess();
}
Result KDebugBase::OnTerminateProcess(KProcess *process) {
MESOSPHERE_ASSERT(process != nullptr);
if (process->IsAttachedToDebugger()) {
KScopedSchedulerLock sl;
if (KDebugBase *debug = GetDebugObject(process); debug != nullptr) {
debug->PushDebugEvent(ams::svc::DebugEvent_ExitProcess, ams::svc::ProcessExitReason_TerminateProcess);
debug->NotifyAvailable();
}
}
return ResultSuccess();
}
Result KDebugBase::OnExitThread(KThread *thread) {
MESOSPHERE_ASSERT(thread != nullptr);
if (KProcess *process = thread->GetOwnerProcess(); process != nullptr && process->IsAttachedToDebugger()) {
R_TRY(OnDebugEvent(ams::svc::DebugEvent_ExitThread, thread->GetId(), thread->IsTerminationRequested() ? ams::svc::ThreadExitReason_TerminateThread : ams::svc::ThreadExitReason_ExitThread));
}
return ResultSuccess();
}
}
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