/*
    Example SWI (Software Interrupt)
    also known as SVC (go to SuperVisor)
*/
.data
calledme:
.string "fireswi() has been called\0"
doneme:
.string "fireswi() has done\0"

.text
.global fireswi
fireswi:
    push {lr}

    ldr r0, =calledme
    bl printkl
    swi #8
    ldr r0, =doneme
    bl printkl

    pop {lr}
    mov pc, lr