[service] unstub process winding (#2590)

It's used on FW19+ and FW20+ but since all 20+ applets stuck on HID, you still can't boot into applets.
Should fix: Bioshock Infinite on FW19

Reviewed-on: #2590
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: unknown <sahyno1996@gmail.com>
Co-committed-by: unknown <sahyno1996@gmail.com>

src/core/hle/service/am/applet.h

@@ -8,6 +8,7 @@
 
 #include <deque>
 #include <mutex>
+#include <stack>
 
 #include "common/math_util.h"
 #include "core/hle/service/apm/apm_controller.h"
@@ -23,6 +24,7 @@
 #include "core/hle/service/am/hid_registration.h"
 #include "core/hle/service/am/lifecycle_manager.h"
 #include "core/hle/service/am/process_holder.h"
+#include "core/hle/service/am/service/storage.h"
 
 namespace Service::AM {
 
@@ -97,6 +99,9 @@ struct Applet {
     std::deque<std::vector<u8>> preselected_user_launch_parameter{};
     std::deque<std::vector<u8>> friend_invitation_storage_channel{};
 
+    // Context Stack
+    std::stack<SharedPointer<IStorage>> context_stack{};
+
     // Caller applet
     std::weak_ptr<Applet> caller_applet{};
     std::shared_ptr<AppletDataBroker> caller_applet_broker{};

src/core/hle/service/am/service/process_winding_controller.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -15,12 +18,12 @@ IProcessWindingController::IProcessWindingController(Core::System& system_,
     static const FunctionInfo functions[] = {
         {0, D<&IProcessWindingController::GetLaunchReason>, "GetLaunchReason"},
         {11, D<&IProcessWindingController::OpenCallingLibraryApplet>, "OpenCallingLibraryApplet"},
-        {21, nullptr, "PushContext"},
+        {21, D<&IProcessWindingController::PushContext>, "PushContext"},
-        {22, nullptr, "PopContext"},
+        {22, D<&IProcessWindingController::PopContext>, "PopContext"},
-        {23, nullptr, "CancelWindingReservation"},
+        {23, D<&IProcessWindingController::CancelWindingReservation>, "CancelWindingReservation"},
-        {30, nullptr, "WindAndDoReserved"},
+        {30, D<&IProcessWindingController::WindAndDoReserved>, "WindAndDoReserved"},
-        {40, nullptr, "ReserveToStartAndWaitAndUnwindThis"},
+        {40, D<&IProcessWindingController::ReserveToStartAndWaitAndUnwindThis>, "ReserveToStartAndWaitAndUnwindThis"},
-        {41, nullptr, "ReserveToStartAndWait"},
+        {41, D<&IProcessWindingController::ReserveToStartAndWait>, "ReserveToStartAndWait"},
     };
     // clang-format on
 
@@ -51,4 +54,43 @@ Result IProcessWindingController::OpenCallingLibraryApplet(
     R_SUCCEED();
 }
 
+Result IProcessWindingController::PushContext(SharedPointer<IStorage> context) {
+    LOG_INFO(Service_AM, "called");
+    m_applet->context_stack.push(context);
+    R_SUCCEED();
+}
+
+Result IProcessWindingController::PopContext(Out<SharedPointer<IStorage>> out_context) {
+    LOG_INFO(Service_AM, "called");
+
+    if (m_applet->context_stack.empty()) {
+        LOG_ERROR(Service_AM, "Context stack is empty");
+        R_THROW(ResultUnknown);
+    }
+
+    *out_context = m_applet->context_stack.top();
+    m_applet->context_stack.pop();
+    R_SUCCEED();
+}
+
+Result IProcessWindingController::CancelWindingReservation() {
+    LOG_WARNING(Service_AM, "STUBBED");
+    R_SUCCEED();
+}
+
+Result IProcessWindingController::WindAndDoReserved() {
+    LOG_WARNING(Service_AM, "STUBBED");
+    R_SUCCEED();
+}
+
+Result IProcessWindingController::ReserveToStartAndWaitAndUnwindThis() {
+    LOG_WARNING(Service_AM, "STUBBED");
+    R_SUCCEED();
+}
+
+Result IProcessWindingController::ReserveToStartAndWait() {
+    LOG_WARNING(Service_AM, "STUBBED");
+    R_SUCCEED();
+}
+
 } // namespace Service::AM

src/core/hle/service/am/service/process_winding_controller.h

@@ -1,8 +1,12 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
+#include "core/hle/service/am/service/storage.h"
 #include "core/hle/service/am/am_types.h"
 #include "core/hle/service/cmif_types.h"
 #include "core/hle/service/service.h"
@@ -21,6 +25,12 @@ private:
     Result GetLaunchReason(Out<AppletProcessLaunchReason> out_launch_reason);
     Result OpenCallingLibraryApplet(
         Out<SharedPointer<ILibraryAppletAccessor>> out_calling_library_applet);
+    Result PushContext(SharedPointer<IStorage> in_context);
+    Result PopContext(Out<SharedPointer<IStorage>> out_context);
+    Result CancelWindingReservation();
+    Result WindAndDoReserved();
+    Result ReserveToStartAndWaitAndUnwindThis();
+    Result ReserveToStartAndWait();
 
     const std::shared_ptr<Applet> m_applet;
 };

src/core/hle/service/am/service/self_controller.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -67,6 +70,7 @@ ISelfController::ISelfController(Core::System& system_, std::shared_ptr<Applet>
         {110, nullptr, "SetApplicationAlbumUserData"},
         {120, D<&ISelfController::SaveCurrentScreenshot>, "SaveCurrentScreenshot"},
         {130, D<&ISelfController::SetRecordVolumeMuted>, "SetRecordVolumeMuted"},
+        {230, D<&ISelfController::Unknown230>, "Unknown230"},
         {1000, nullptr, "GetDebugStorageChannel"},
     };
     // clang-format on
@@ -404,4 +408,12 @@ Result ISelfController::SetRecordVolumeMuted(bool muted) {
     R_SUCCEED();
 }
 
+Result ISelfController::Unknown230(u32 in_val, Out<u16> out_val) {
+    LOG_WARNING(Service_AM, "(STUBBED) called, in_val={}", in_val);
+
+    *out_val = 0;
+
+    R_SUCCEED();
+}
+
 } // namespace Service::AM

src/core/hle/service/am/service/self_controller.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -63,6 +66,7 @@ private:
     Result SetAlbumImageTakenNotificationEnabled(bool enabled);
     Result SaveCurrentScreenshot(Capture::AlbumReportOption album_report_option);
     Result SetRecordVolumeMuted(bool muted);
+    Result Unknown230(u32 in_val, Out<u16> out_val);
 
     Kernel::KProcess* const m_process;
     const std::shared_ptr<Applet> m_applet;