diff --git a/public/rtos/ape_spu/libsmartos.a b/public/rtos/ape_spu/libsmartos.a
index 25e7609..8027f63 100644
Binary files a/public/rtos/ape_spu/libsmartos.a and b/public/rtos/ape_spu/libsmartos.a differ
diff --git a/public/rtos/code/smartos_code/src/smartos.s.c b/public/rtos/code/smartos_code/src/smartos.s.c
index 9565d20..40762ac 100644
--- a/public/rtos/code/smartos_code/src/smartos.s.c
+++ b/public/rtos/code/smartos_code/src/smartos.s.c
@@ -97,7 +97,7 @@ void sys_task_reg(sys_info *task_val,start_hook_func *user_hook,int apeid)
         tcb_handle->loop_fun = task_val->loop_fun;
         tcb_handle->user_init_hook = user_hook;
         tcb_handle->apeid = apeid;
-        init_st_ptr = stack_top;
+        init_st_ptr = stack_down;
         smart_task_create(sys_entry,
                             tcb_handle,
                             (unsigned int*)stack_top,