arm处理器软中断处理。a_swi.s文件是最开始处理的swi句柄,用arm汇编指令编写。c_swi.c文件是在执行a_swi.s文件之后调用执行的C语言swi句柄。 -arm processor soft interrupt handling. a_swi.s document is the beginning of the swi handler deal with the preparation of arm compilation directives. c_swi.c document