Kernel/SVC: Partially implemented svcExitProcess.

Terminating processes with ready threads is not currently implemented and will assert. It is currently unknown how the 3DS kernel stops ready threads or threads running in another core.

src/core/hle/kernel/process.cpp

@@ -40,6 +40,7 @@ SharedPtr<Process> Process::Create(SharedPtr<CodeSet> code_set) {
     process->codeset = std::move(code_set);
     process->flags.raw = 0;
     process->flags.memory_region.Assign(MemoryRegion::APPLICATION);
+    process->status = ProcessStatus::Created;
 
     process_list.push_back(process);
     return process;
@@ -151,6 +152,8 @@ void Process::Run(s32 main_thread_priority, u32 stack_size) {
         HandleSpecialMapping(vm_manager, mapping);
     }
 
+    status = ProcessStatus::Running;
+
     vm_manager.LogLayout(Log::Level::Debug);
     Kernel::SetupMainThread(codeset->entrypoint, main_thread_priority, this);
 }

src/core/hle/kernel/process.h

@@ -49,6 +49,8 @@ union ProcessFlags {
     BitField<12, 1, u16> loaded_high; ///< Application loaded high (not at 0x00100000).
 };
 
+enum class ProcessStatus { Created, Running, Exited };
+
 class ResourceLimit;
 struct MemoryRegionInfo;
 
@@ -122,6 +124,8 @@ public:
     u16 kernel_version = 0;
     /// The default CPU for this process, threads are scheduled on this cpu by default.
     u8 ideal_processor = 0;
+    /// Current status of the process
+    ProcessStatus status;
 
     /// The id of this process
     u32 process_id = next_process_id++;

src/core/hle/kernel/svc.cpp

@@ -143,6 +143,36 @@ static ResultCode ControlMemory(u32* out_addr, u32 operation, u32 addr0, u32 add
     return RESULT_SUCCESS;
 }
 
+static void ExitProcess() {
+    LOG_INFO(Kernel_SVC, "Process %u exiting", g_current_process->process_id);
+
+    ASSERT_MSG(g_current_process->status == ProcessStatus::Running, "Process has already exited");
+
+    g_current_process->status = ProcessStatus::Exited;
+
+    // Stop all the process threads that are currently waiting for objects.
+    auto& thread_list = GetThreadList();
+    for (auto& thread : thread_list) {
+        if (thread->owner_process != g_current_process)
+            continue;
+
+        if (thread == GetCurrentThread())
+            continue;
+
+        // TODO(Subv): When are the other running/ready threads terminated?
+        ASSERT_MSG(thread->status == THREADSTATUS_WAIT_SYNCH_ANY ||
+                       thread->status == THREADSTATUS_WAIT_SYNCH_ALL,
+                   "Exiting processes with non-waiting threads is currently unimplemented");
+
+        thread->Stop();
+    }
+
+    // Kill the current thread
+    GetCurrentThread()->Stop();
+
+    Core::System::GetInstance().PrepareReschedule();
+}
+
 /// Maps a memory block to specified address
 static ResultCode MapMemoryBlock(Handle handle, u32 addr, u32 permissions, u32 other_permissions) {
     LOG_TRACE(Kernel_SVC,
@@ -1232,7 +1262,7 @@ static const FunctionDef SVC_Table[] = {
     {0x00, nullptr, "Unknown"},
     {0x01, HLE::Wrap<ControlMemory>, "ControlMemory"},
     {0x02, HLE::Wrap<QueryMemory>, "QueryMemory"},
-    {0x03, nullptr, "ExitProcess"},
+    {0x03, ExitProcess, "ExitProcess"},
     {0x04, nullptr, "GetProcessAffinityMask"},
     {0x05, nullptr, "SetProcessAffinityMask"},
     {0x06, nullptr, "GetProcessIdealProcessor"},
@@ -1373,6 +1403,9 @@ void CallSVC(u32 immediate) {
     // Lock the global kernel mutex when we enter the kernel HLE.
     std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
 
+    ASSERT_MSG(g_current_process->status == ProcessStatus::Running,
+               "Running threads from exiting processes is unimplemented");
+
     const FunctionDef* info = GetSVCInfo(immediate);
     if (info) {
         if (info->func) {