.code 32 .section .vect .extern startup intr_vector: b startup b intr_entry_undef b intr_entry_swi b intr_entry_iabort b intr_entry_dabort b intr_entry_irq @ FIQ entry point used for timer interrupts .extern num_ticks intr_entry_fiq: ldr r9, =num_ticks ldr r8, [r9] add r8, #1 str r8, [r9] subs pc, lr, #4 .text intr_entry_undef: intr_entry_swi: intr_entry_iabort: intr_entry_dabort: intr_entry_irq: subs pc, lr, #4