3 files changed, 33 insertions, 0 deletions
diff --git a/src/core/hle/kernel/k_process.cpp b/src/core/hle/kernel/k_process.cpp
index 490e31fc7..dcfeacccd 100644
--- a/src/core/hle/kernel/k_process.cpp
+++ b/src/core/hle/kernel/k_process.cpp
@@ -64,6 +64,10 @@ void SetupMainThread(Core::System& system, KProcess& owner_process, u32 priority
     {
         KScopedSchedulerLock lock{kernel};
         thread->SetState(ThreadState::Runnable);
+
+        if (system.DebuggerEnabled()) {
+            thread->RequestSuspend(SuspendType::Debug);
+        }
     }
 }
 } // Anonymous namespace
diff --git a/src/core/hle/kernel/k_thread.cpp b/src/core/hle/kernel/k_thread.cpp
index ab9ce6a86..940334f59 100644
--- a/src/core/hle/kernel/k_thread.cpp
+++ b/src/core/hle/kernel/k_thread.cpp
@@ -198,6 +198,10 @@ ResultCode KThread::Initialize(KThreadFunction func, uintptr_t arg, VAddr user_s
     resource_limit_release_hint = false;
     cpu_time = 0;
 
+    // Set debug context.
+    stack_top = user_stack_top;
+    argument = arg;
+
     // Clear our stack parameters.
     std::memset(static_cast<void*>(std::addressof(GetStackParameters())), 0,
                 sizeof(StackParameters));
diff --git a/src/core/hle/kernel/k_thread.h b/src/core/hle/kernel/k_thread.h
index b55a922ab..f4d83f99a 100644
--- a/src/core/hle/kernel/k_thread.h
+++ b/src/core/hle/kernel/k_thread.h
@@ -100,6 +100,12 @@ enum class ThreadWaitReasonForDebugging : u32 {
     Suspended,       ///< Thread is waiting due to process suspension
 };
 
+enum class StepState : u32 {
+    NotStepping,   ///< Thread is not currently stepping
+    StepPending,   ///< Thread will step when next scheduled
+    StepPerformed, ///< Thread has stepped, waiting to be scheduled again
+};
+
 [[nodiscard]] KThread* GetCurrentThreadPointer(KernelCore& kernel);
 [[nodiscard]] KThread& GetCurrentThread(KernelCore& kernel);
 [[nodiscard]] s32 GetCurrentCoreId(KernelCore& kernel);
@@ -267,6 +273,14 @@ public:
 
     void SetState(ThreadState state);
 
+    [[nodiscard]] StepState GetStepState() const {
+        return step_state;
+    }
+
+    void SetStepState(StepState state) {
+        step_state = state;
+    }
+
     [[nodiscard]] s64 GetLastScheduledTick() const {
         return last_scheduled_tick;
     }
@@ -646,6 +660,14 @@ public:
     void IfDummyThreadTryWait();
     void IfDummyThreadEndWait();
 
+    [[nodiscard]] uintptr_t GetArgument() const {
+        return argument;
+    }
+
+    [[nodiscard]] VAddr GetUserStackTop() const {
+        return stack_top;
+    }
+
 private:
     static constexpr size_t PriorityInheritanceCountMax = 10;
     union SyncObjectBuffer {
@@ -769,6 +791,7 @@ private:
     std::shared_ptr<Common::Fiber> host_context{};
     bool is_single_core{};
     ThreadType thread_type{};
+    StepState step_state{};
     std::mutex dummy_wait_lock;
     std::condition_variable dummy_wait_cv;
 
@@ -776,6 +799,8 @@ private:
     std::vector<KSynchronizationObject*> wait_objects_for_debugging;
     VAddr mutex_wait_address_for_debugging{};
     ThreadWaitReasonForDebugging wait_reason_for_debugging{};
+    uintptr_t argument;
+    VAddr stack_top;
 
 public:
     using ConditionVariableThreadTreeType = ConditionVariableThreadTree;