4 files changed, 30 insertions, 1 deletions
diff --git a/src/core/hle/service/acc/acc.cpp b/src/core/hle/service/acc/acc.cpp
index eb54cb123..6b1613510 100644
--- a/src/core/hle/service/acc/acc.cpp
+++ b/src/core/hle/service/acc/acc.cpp
@@ -774,6 +774,17 @@ void Module::Interface::ListQualifiedUsers(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
 }
 
+void Module::Interface::LoadOpenContext(Kernel::HLERequestContext& ctx) {
+    LOG_WARNING(Service_ACC, "(STUBBED) called");
+
+    // This is similar to GetBaasAccountManagerForApplication
+    // This command is used concurrently with ListOpenContextStoredUsers
+    // TODO: Find the differences between this and GetBaasAccountManagerForApplication
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(RESULT_SUCCESS);
+    rb.PushIpcInterface<IManagerForApplication>(profile_manager->GetLastOpenedUser());
+}
+
 void Module::Interface::ListOpenContextStoredUsers(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_ACC, "(STUBBED) called");
 
diff --git a/src/core/hle/service/acc/acc.h b/src/core/hle/service/acc/acc.h
index d4c6395c6..c611efd89 100644
--- a/src/core/hle/service/acc/acc.h
+++ b/src/core/hle/service/acc/acc.h
@@ -34,6 +34,7 @@ public:
         void IsUserAccountSwitchLocked(Kernel::HLERequestContext& ctx);
         void GetProfileEditor(Kernel::HLERequestContext& ctx);
         void ListQualifiedUsers(Kernel::HLERequestContext& ctx);
+        void LoadOpenContext(Kernel::HLERequestContext& ctx);
         void ListOpenContextStoredUsers(Kernel::HLERequestContext& ctx);
 
     private:
diff --git a/src/core/hle/service/acc/acc_u0.cpp b/src/core/hle/service/acc/acc_u0.cpp
index cb44e06b7..75a24f8f5 100644
--- a/src/core/hle/service/acc/acc_u0.cpp
+++ b/src/core/hle/service/acc/acc_u0.cpp
@@ -29,7 +29,7 @@ ACC_U0::ACC_U0(std::shared_ptr<Module> module, std::shared_ptr<ProfileManager> p
         {110, nullptr, "StoreSaveDataThumbnail"},
         {111, nullptr, "ClearSaveDataThumbnail"},
         {120, nullptr, "CreateGuestLoginRequest"},
-        {130, nullptr, "LoadOpenContext"}, // 5.0.0+
+        {130, &ACC_U0::LoadOpenContext, "LoadOpenContext"}, // 5.0.0+
         {131, &ACC_U0::ListOpenContextStoredUsers, "ListOpenContextStoredUsers"}, // 6.0.0+
         {140, &ACC_U0::InitializeApplicationInfoRestricted, "InitializeApplicationInfoRestricted"}, // 6.0.0+
         {141, &ACC_U0::ListQualifiedUsers, "ListQualifiedUsers"}, // 6.0.0+
diff --git a/src/core/hle/service/service.cpp b/src/core/hle/service/service.cpp
index 76b3533ec..ba9159ee0 100644
--- a/src/core/hle/service/service.cpp
+++ b/src/core/hle/service/service.cpp
@@ -72,6 +72,23 @@
 
 namespace Service {
 
+/**
+ * Creates a function string for logging, complete with the name (or header code, depending
+ * on what's passed in) the port name, and all the cmd_buff arguments.
+ */
+[[maybe_unused]] static std::string MakeFunctionString(std::string_view name,
+                                                       std::string_view port_name,
+                                                       const u32* cmd_buff) {
+    // Number of params == bits 0-5 + bits 6-11
+    int num_params = (cmd_buff[0] & 0x3F) + ((cmd_buff[0] >> 6) & 0x3F);
+
+    std::string function_string = fmt::format("function '{}': port={}", name, port_name);
+    for (int i = 1; i <= num_params; ++i) {
+        function_string += fmt::format(", cmd_buff[{}]=0x{:X}", i, cmd_buff[i]);
+    }
+    return function_string;
+}
+
 ServiceFrameworkBase::ServiceFrameworkBase(const char* service_name, u32 max_sessions,
                                            InvokerFn* handler_invoker)
     : service_name(service_name), max_sessions(max_sessions), handler_invoker(handler_invoker) {}