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 is in the implementation of a_swi.s document called the C language implementation of SWI handler.