Thomas Koeller wrote: > Hi, > > the following code snippet is from > arch/mips/pmc-sierra/yosemite/irq-handler.S: > > ll_duart_irq: > li a0, 4 > move a1, sp > jal do_IRQ > j ret_from_irq > > I wonder if this is correct. AFAIK, a jump instruction > must not occupy the delay slot of another branch or > jump instruction. Since the 'jal' returns to the first > instruction after the delay slot, I would expect the > effect of the 'j' instruction to be cancelled. Or > is this some kind of trick I do not understand? I guess this code has no preceeding ".set noreorder" directive. By default, your friendly assembler handles delay slots for you. :-) Thiemo
