EEPW论坛

在有关堆栈的设置中，我不明白下段代码的意思

往高手指教：

sub sp,sp,#4 ;decrement sp(to store jump address) stmfd sp!,{r0} ;PUSH the work register to stack(lr does't push because it return to original address) ldr r0,=$HandleLabel;load the address of HandleXXX to r0 ldr r0,[r0] ;load the contents(service routine start address) of HandleXXX str r0,[sp,#4] ;store the contents(ISR) of HandleXXX to stack ldmfd sp!,{r0,pc} ;POP the work register and pc(jump to ISR)

多谢。有谁想要完整的源代码，我可以提供