.data
panic_msg:
.string "=== PANIC : I'm afraid I have lost my towel"

.text

.extern c_printk
.global printk
printk:
    push {lr}

    /* disables IRQ and FIQ in CPU */
    cpsid if

    /* C-Implementation */
    bl c_printk

    /* enables IRQ and FIQ in CPU */
    cpsie if

    pop {pc}

/* TODO: to be implemented in a more useful way */
.global panic
panic:
    cpsid if

    ldr r0, =panic_msg
    bl printkl

1:
    wfi
    b 1b