dmnt-cheat: Implement real workaround for 6.0.0+ kernel bug

2025-05-27 13:14:15 -04:00 · 2019-03-15 03:30:51 -07:00 · 2019-03-15 03:30:51 -07:00 · e5ecd243f2
commit e5ecd243f2
parent 274035edd6
3 changed files with 237 additions and 33 deletions
--- a/stratosphere/dmnt/source/dmnt_cheat_debug_events_manager.cpp
+++ b/stratosphere/dmnt/source/dmnt_cheat_debug_events_manager.cpp
@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2018 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 <map>
+#include <switch.h>
+#include "dmnt_config.hpp"
+#include "dmnt_cheat_debug_events_manager.hpp"
+
+
+/* WORKAROUND: This design prevents a kernel deadlock from occurring on 6.0.0+ */
+
+static HosThread g_per_core_threads[DmntCheatDebugEventsManager::NumCores];
+static HosMessageQueue *g_per_core_queues[DmntCheatDebugEventsManager::NumCores];
+static HosSignal g_continued_signal;
+
+void DmntCheatDebugEventsManager::PerCoreThreadFunc(void *arg) {
+    /* This thread will simply wait on the appropriate message queue. */
+    size_t current_core = reinterpret_cast<size_t>(arg);
+    while (true) {
+        Handle debug_handle = 0;
+        /* Get the debug handle. */
+        {
+            uintptr_t x = 0;
+            g_per_core_queues[current_core]->Receive(&x);
+            debug_handle = static_cast<Handle>(x);
+        }
+        
+        /* Continue the process, if needed. */
+        if (kernelAbove300()) {
+            svcContinueDebugEvent(debug_handle, 5, nullptr, 0);
+        } else {
+            svcLegacyContinueDebugEvent(debug_handle, 5, 0);
+        }
+        
+        g_continued_signal.Signal();
+    }
+}
+
+void DmntCheatDebugEventsManager::ContinueCheatProcess(Handle cheat_dbg_hnd) {
+    /* Loop getting debug events. */
+    DebugEventInfo dbg_event;
+    while (R_SUCCEEDED(svcGetDebugEvent((u8 *)&dbg_event, cheat_dbg_hnd))) {
+        /* ... */
+    }
+    
+    size_t target_core = DmntCheatDebugEventsManager::NumCores - 1;
+    /* Retrieve correct core for new thread event. */
+    if (dbg_event.type == DebugEventType::AttachThread) {
+        u64 out64;
+        u32 out32;
+        Result rc = svcGetDebugThreadParam(&out64, &out32, cheat_dbg_hnd, dbg_event.info.attach_thread.thread_id, DebugThreadParam_CurrentCore);
+        if (R_FAILED(rc)) {
+            fatalSimple(rc);
+        }
+        
+        
+        target_core = out32;
+    }
+    
+    /* Make appropriate thread continue. */
+    g_per_core_queues[target_core]->Send(static_cast<uintptr_t>(cheat_dbg_hnd));
+    
+    /* Wait. */
+    g_continued_signal.Wait();
+    g_continued_signal.Reset();
+}
+
+void DmntCheatDebugEventsManager::Initialize() {
+    /* Spawn per core resources. */
+    for (size_t i = 0; i < DmntCheatDebugEventsManager::NumCores; i++) {
+        /* Create queue. */
+        g_per_core_queues[i] = new HosMessageQueue(1);
+        
+        /* Create thread. */
+        if (R_FAILED(g_per_core_threads[i].Initialize(&DmntCheatDebugEventsManager::PerCoreThreadFunc, reinterpret_cast<void *>(i), 0x1000, 24, i))) {
+            std::abort();
+        }
+        
+        /* Set core mask. */
+        if (R_FAILED(svcSetThreadCoreMask(g_per_core_threads[i].GetHandle(), i, (1u << i)))) {
+            std::abort();
+        }
+        
+        /* Start thread. */
+        if (R_FAILED(g_per_core_threads[i].Start())) {
+            std::abort();
+        }
+    }
+}