kernel/svc: Implement InitialProcessIdRange and improve process exit handling

- Replace stubbed InitialProcessIdRange implementation with proper bounds (1-0x50)
- Add handle and info_sub_id validation for InitialProcessIdRange
- Replace process exit ASSERT with graceful error handling and logging
- Add try-catch block around system.Exit() for safer shutdown
- Add atomic header inclusion for binder.h

This improves system call reliability by properly implementing process ID
range checks and adding safer process exit handling with proper error logging.

3 files changed, 23 insertions, 6 deletions

diff --git a/src/core/hle/kernel/svc/svc_info.cpp b/src/core/hle/kernel/svc/svc_info.cpp
index a66d633f8..26eb1ce92 100644
--- a/src/core/hle/kernel/svc/svc_info.cpp
+++ b/src/core/hle/kernel/svc/svc_info.cpp
@@ -174,9 +174,15 @@ Result GetInfo(Core::System& system, u64* result, InfoType info_id_type, Handle
         R_SUCCEED();
 
     case InfoType::InitialProcessIdRange:
-        LOG_WARNING(Kernel_SVC,
-                    "(STUBBED) Attempted to query privileged process id bounds, returned 0");
-        *result = 0;
+        R_UNLESS(handle == 0, ResultInvalidHandle);
+        R_UNLESS(info_sub_id <= 1, ResultInvalidCombination);
+
+        // Return the valid range for initial process IDs
+        if (info_sub_id == 0) {
+            *result = 1;       // Minimum initial process ID
+        } else {
+            *result = 0x50;    // Maximum initial process ID
+        }
         R_SUCCEED();
 
     case InfoType::ThreadTickCount: {
diff --git a/src/core/hle/kernel/svc/svc_process.cpp b/src/core/hle/kernel/svc/svc_process.cpp
index 5c3e8829f..acd1864da 100644
--- a/src/core/hle/kernel/svc/svc_process.cpp
+++ b/src/core/hle/kernel/svc/svc_process.cpp
@@ -12,10 +12,19 @@ void ExitProcess(Core::System& system) {
     auto* current_process = GetCurrentProcessPointer(system.Kernel());
 
     LOG_INFO(Kernel_SVC, "Process {} exiting", current_process->GetProcessId());
-    ASSERT_MSG(current_process->GetState() == KProcess::State::Running,
-               "Process has already exited");
 
-    system.Exit();
+    // Check if process is in a valid state for exit
+    if (current_process->GetState() != KProcess::State::Running) {
+        LOG_WARNING(Kernel_SVC, "Process {} already exiting or in invalid state", current_process->GetProcessId());
+        return;
+    }
+
+    // Ensure clean shutdown
+    try {
+        system.Exit();
+    } catch (const std::exception& e) {
+        LOG_ERROR(Kernel_SVC, "Error during process exit: {}", e.what());
+    }
 }
 
 /// Gets the ID of the specified process or a specified thread's owning process.
diff --git a/src/core/hle/service/nvnflinger/binder.h b/src/core/hle/service/nvnflinger/binder.h
index f9f326e3b..6928a81ec 100644
--- a/src/core/hle/service/nvnflinger/binder.h
+++ b/src/core/hle/service/nvnflinger/binder.h
@@ -1,11 +1,13 @@
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
 // SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 // Parts of this implementation were based on:
 // https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/binder/IBinder.h
 
 #pragma once
 
+#include <atomic>
 #include <span>
 
 #include "common/common_types.h"