diff --git a/dlls/ntdll/ntdll_misc.h b/dlls/ntdll/ntdll_misc.h
index a17c5d9afb1..1393bbf6c66 100644
--- a/dlls/ntdll/ntdll_misc.h
+++ b/dlls/ntdll/ntdll_misc.h
@@ -57,7 +57,6 @@ extern NTSTATUS context_to_server( context_t *to, const CONTEXT *from ) DECLSPEC
 extern NTSTATUS context_from_server( CONTEXT *to, const context_t *from ) DECLSPEC_HIDDEN;
 extern NTSTATUS set_thread_context( HANDLE handle, const CONTEXT *context, BOOL *self ) DECLSPEC_HIDDEN;
 extern NTSTATUS get_thread_context( HANDLE handle, CONTEXT *context, BOOL *self ) DECLSPEC_HIDDEN;
-extern void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg ) DECLSPEC_NORETURN DECLSPEC_HIDDEN;
 
 /* debug helpers */
 extern LPCSTR debugstr_us( const UNICODE_STRING *str ) DECLSPEC_HIDDEN;
diff --git a/dlls/ntdll/signal_arm.c b/dlls/ntdll/signal_arm.c
index 0cdda2c4695..e1aa94f0728 100644
--- a/dlls/ntdll/signal_arm.c
+++ b/dlls/ntdll/signal_arm.c
@@ -1013,63 +1013,6 @@ void signal_init_process(void)
 }
 
 
-struct startup_info
-{
-    LPTHREAD_START_ROUTINE entry;
-    void                  *arg;
-};
-
-static void thread_startup( void *param )
-{
-    struct startup_info *info = param;
-    call_thread_entry_point( info->entry, info->arg );
-}
-
-
-/***********************************************************************
- *           signal_start_thread
- */
-void signal_start_thread( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend )
-{
-    CONTEXT context = { 0 };
-    struct startup_info info = { entry, arg };
-
-    /* build the initial context */
-    context.ContextFlags = CONTEXT_FULL;
-    context.R0 = (DWORD)entry;
-    context.R1 = (DWORD)arg;
-    context.Sp = (DWORD)NtCurrentTeb()->Tib.StackBase;
-    context.Pc = (DWORD)call_thread_entry_point;
-
-    if (suspend) wait_suspend( &context );
-
-    wine_call_on_stack( attach_dlls, (void *)1, NtCurrentTeb()->Tib.StackBase );
-    TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
-    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
-}
-
-
-/**********************************************************************
- *		signal_start_process
- */
-void signal_start_process( LPTHREAD_START_ROUTINE entry, BOOL suspend )
-{
-    CONTEXT context = { 0 };
-
-    /* build the initial context */
-    context.ContextFlags = CONTEXT_FULL;
-    context.R0 = (DWORD)kernel32_start_process;
-    context.R1 = (DWORD)entry;
-    context.Sp = (DWORD)NtCurrentTeb()->Tib.StackBase;
-    context.Pc = (DWORD)call_thread_entry_point;
-
-    if (suspend) wait_suspend( &context );
-
-    wine_call_on_stack( attach_dlls, (void *)1, (char *)NtCurrentTeb()->Tib.StackBase );
-    set_cpu_context( &context );
-}
-
-
 /**********************************************************************
  *              __wine_enter_vm86   (NTDLL.@)
  */
@@ -1250,10 +1193,11 @@ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer,
 /***********************************************************************
  *           call_thread_entry_point
  */
-void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
+static void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
 {
     __TRY
     {
+        TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
         exit_thread( entry( arg ));
     }
     __EXCEPT(unhandled_exception_filter)
@@ -1264,6 +1208,63 @@ void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
     abort();  /* should not be reached */
 }
 
+struct startup_info
+{
+    LPTHREAD_START_ROUTINE entry;
+    void                  *arg;
+    BOOL                   suspend;
+};
+
+/***********************************************************************
+ *           thread_startup
+ */
+static void thread_startup( void *param )
+{
+    CONTEXT context = { 0 };
+    struct startup_info *info = param;
+
+    /* build the initial context */
+    context.ContextFlags = CONTEXT_FULL;
+    context.R0 = (DWORD)info->entry;
+    context.R1 = (DWORD)info->arg;
+    context.Sp = (DWORD)NtCurrentTeb()->Tib.StackBase;
+    context.Pc = (DWORD)call_thread_entry_point;
+
+    if (info->suspend) wait_suspend( &context );
+    attach_dlls( &context );
+
+    set_cpu_context( &context );
+}
+
+/***********************************************************************
+ *           signal_start_thread
+ *
+ * Thread startup sequence:
+ * signal_start_thread()
+ *   -> thread_startup()
+ *     -> call_thread_entry_point()
+ */
+void signal_start_thread( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend )
+{
+    struct startup_info info = { entry, arg, suspend };
+    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
+}
+
+/**********************************************************************
+ *		signal_start_process
+ *
+ * Process startup sequence:
+ * signal_start_process()
+ *   -> thread_startup()
+ *     -> call_thread_entry_point()
+ *       -> kernel32_start_process()
+ */
+void signal_start_process( LPTHREAD_START_ROUTINE entry, BOOL suspend )
+{
+    struct startup_info info = { kernel32_start_process, entry, suspend };
+    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
+}
+
 /***********************************************************************
  *           RtlExitUserThread  (NTDLL.@)
  */
diff --git a/dlls/ntdll/signal_arm64.c b/dlls/ntdll/signal_arm64.c
index 537bd08aad1..3dc92ad2dbb 100644
--- a/dlls/ntdll/signal_arm64.c
+++ b/dlls/ntdll/signal_arm64.c
@@ -884,72 +884,6 @@ void signal_init_process(void)
 }
 
 
-struct startup_info
-{
-    LPTHREAD_START_ROUTINE entry;
-    void                  *arg;
-};
-
-static void thread_startup( void *param )
-{
-    struct startup_info *info = param;
-    call_thread_entry_point( info->entry, info->arg );
-}
-
-
-/***********************************************************************
- *           signal_start_thread
- */
-void signal_start_thread( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend )
-{
-    CONTEXT context = { 0 };
-    struct startup_info info = { entry, arg };
-
-    /* build the initial context */
-    context.ContextFlags = CONTEXT_FULL;
-    context.X0 = (DWORD_PTR)entry;
-    context.X1 = (DWORD_PTR)arg;
-    context.Sp = (DWORD_PTR)NtCurrentTeb()->Tib.StackBase;
-    context.Pc = (DWORD_PTR)call_thread_entry_point;
-
-    if (suspend) wait_suspend( &context );
-
-    wine_call_on_stack( attach_dlls, (void *)1, NtCurrentTeb()->Tib.StackBase );
-    TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
-    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
-}
-
-
-/***********************************************************************
- *           start_process
- */
-static void start_process( void *arg )
-{
-    CONTEXT *context = arg;
-    call_thread_entry_point( (LPTHREAD_START_ROUTINE)context->X0, (void *)context->X1 );
-}
-
-/**********************************************************************
- *		signal_start_process
- */
-void signal_start_process( LPTHREAD_START_ROUTINE entry, BOOL suspend )
-{
-    CONTEXT context = { 0 };
-
-    /* build the initial context */
-    context.ContextFlags = CONTEXT_FULL;
-    context.X0 = (DWORD_PTR)kernel32_start_process;
-    context.X1 = (DWORD_PTR)entry;
-    context.Sp = (DWORD_PTR)NtCurrentTeb()->Tib.StackBase;
-    context.Pc = (DWORD_PTR)call_thread_entry_point;
-
-    if (suspend) wait_suspend( &context );
-
-    wine_call_on_stack( attach_dlls, (void *)1, (void *)context.Sp );
-    wine_switch_to_stack( start_process, &context, (void *)context.Sp );
-}
-
-
 /**********************************************************************
  *              __wine_enter_vm86   (NTDLL.@)
  */
@@ -1002,10 +936,11 @@ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer,
 /***********************************************************************
  *           call_thread_entry_point
  */
-void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
+static void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
 {
     __TRY
     {
+        TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
         exit_thread( entry( arg ));
     }
     __EXCEPT(unhandled_exception_filter)
@@ -1016,6 +951,63 @@ void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
     abort();  /* should not be reached */
 }
 
+struct startup_info
+{
+    LPTHREAD_START_ROUTINE entry;
+    void                  *arg;
+    BOOL                   suspend;
+};
+
+/***********************************************************************
+ *           thread_startup
+ */
+static void thread_startup( void *param )
+{
+    CONTEXT context = { 0 };
+    struct startup_info *info = param;
+
+    /* build the initial context */
+    context.ContextFlags = CONTEXT_FULL;
+    context.X0 = (DWORD_PTR)info->entry;
+    context.X1 = (DWORD_PTR)info->arg;
+    context.Sp = (DWORD_PTR)NtCurrentTeb()->Tib.StackBase;
+    context.Pc = (DWORD_PTR)call_thread_entry_point;
+
+    if (info->suspend) wait_suspend( &context );
+    attach_dlls( &context );
+
+    call_thread_entry_point( (LPTHREAD_START_ROUTINE)context.X0, (void *)context.X1 );
+}
+
+/***********************************************************************
+ *           signal_start_thread
+ *
+ * Thread startup sequence:
+ * signal_start_thread()
+ *   -> thread_startup()
+ *     -> call_thread_entry_point()
+ */
+void signal_start_thread( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend )
+{
+    struct startup_info info = { entry, arg, suspend };
+    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
+}
+
+/**********************************************************************
+ *		signal_start_process
+ *
+ * Process startup sequence:
+ * signal_start_process()
+ *   -> thread_startup()
+ *     -> call_thread_entry_point()
+ *       -> kernel32_start_process()
+ */
+void signal_start_process( LPTHREAD_START_ROUTINE entry, BOOL suspend )
+{
+    struct startup_info info = { kernel32_start_process, entry, suspend };
+    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
+}
+
 /***********************************************************************
  *           RtlExitUserThread  (NTDLL.@)
  */
diff --git a/dlls/ntdll/signal_powerpc.c b/dlls/ntdll/signal_powerpc.c
index 53667cf1f0e..b0124975f35 100644
--- a/dlls/ntdll/signal_powerpc.c
+++ b/dlls/ntdll/signal_powerpc.c
@@ -1086,72 +1086,6 @@ void signal_init_process(void)
 }
 
 
-struct startup_info
-{
-    LPTHREAD_START_ROUTINE entry;
-    void                  *arg;
-};
-
-static void thread_startup( void *param )
-{
-    struct startup_info *info = param;
-    call_thread_entry_point( info->entry, info->arg );
-}
-
-
-/***********************************************************************
- *           signal_start_thread
- */
-void signal_start_thread( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend )
-{
-    CONTEXT context = { 0 };
-    struct startup_info info = { entry, arg };
-
-    /* build the initial context */
-    context.ContextFlags = CONTEXT_FULL;
-    context.Gpr1 = (DWORD)NtCurrentTeb()->Tib.StackBase;
-    context.Gpr3 = (DWORD)entry;
-    context.Gpr4 = (DWORD)arg;
-    context.Iar  = (DWORD)call_thread_entry_point;
-
-    if (suspend) wait_suspend( &context );
-
-    wine_call_on_stack( attach_dlls, (void *)1, NtCurrentTeb()->Tib.StackBase );
-    TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
-    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
-}
-
-
-/***********************************************************************
- *           start_process
- */
-static void start_process( void *arg )
-{
-    CONTEXT *context = arg;
-    call_thread_entry_point( (LPTHREAD_START_ROUTINE)context->Gpr3, (void *)context->Gpr4 );
-}
-
-/**********************************************************************
- *		signal_start_process
- */
-void signal_start_process( LPTHREAD_START_ROUTINE entry, BOOL suspend )
-{
-    CONTEXT context = { 0 };
-
-    /* build the initial context */
-    context.ContextFlags = CONTEXT_FULL;
-    context.Gpr1 = (DWORD)NtCurrentTeb()->Tib.StackBase;
-    context.Gpr3 = (DWORD)kernel32_start_process;
-    context.Gpr4 = (DWORD)entry;
-    context.Iar  = (DWORD)call_thread_entry_point;
-
-    if (suspend) wait_suspend( &context );
-
-    wine_call_on_stack( attach_dlls, (void *)1, (void *)context.Gpr1 );
-    wine_switch_to_stack( start_process, &context, (void *)context.Gpr1 );
-}
-
-
 /**********************************************************************
  *              __wine_enter_vm86   (NTDLL.@)
  */
@@ -1204,10 +1138,11 @@ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer,
 /***********************************************************************
  *           call_thread_entry_point
  */
-void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
+static void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
 {
     __TRY
     {
+        TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
         exit_thread( entry( arg ));
     }
     __EXCEPT(unhandled_exception_filter)
@@ -1218,6 +1153,63 @@ void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
     abort();  /* should not be reached */
 }
 
+struct startup_info
+{
+    LPTHREAD_START_ROUTINE entry;
+    void                  *arg;
+    BOOL                   suspend;
+};
+
+/***********************************************************************
+ *           thread_startup
+ */
+static void thread_startup( void *param )
+{
+    CONTEXT context = { 0 };
+    struct startup_info *info = param;
+
+    /* build the initial context */
+    context.ContextFlags = CONTEXT_FULL;
+    context.Gpr1 = (DWORD)NtCurrentTeb()->Tib.StackBase;
+    context.Gpr3 = (DWORD)info->entry;
+    context.Gpr4 = (DWORD)info->arg;
+    context.Iar  = (DWORD)call_thread_entry_point;
+
+    if (info->suspend) wait_suspend( &context );
+    attach_dlls( &context );
+
+    call_thread_entry_point( (LPTHREAD_START_ROUTINE)context.Gpr3, (void *)context.Gpr4 );
+}
+
+/***********************************************************************
+ *           signal_start_thread
+ *
+ * Thread startup sequence:
+ * signal_start_thread()
+ *   -> thread_startup()
+ *     -> call_thread_entry_point()
+ */
+void signal_start_thread( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend )
+{
+    struct startup_info info = { entry, arg, suspend };
+    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
+}
+
+/**********************************************************************
+ *		signal_start_process
+ *
+ * Process startup sequence:
+ * signal_start_process()
+ *   -> thread_startup()
+ *     -> call_thread_entry_point()
+ *       -> kernel32_start_process()
+ */
+void signal_start_process( LPTHREAD_START_ROUTINE entry, BOOL suspend )
+{
+    struct startup_info info = { kernel32_start_process, entry, suspend };
+    wine_switch_to_stack( thread_startup, &info, NtCurrentTeb()->Tib.StackBase );
+}
+
 /***********************************************************************
  *           RtlExitUserThread  (NTDLL.@)
  */