[U-Boot] Irq handler code is not working in u-boot

Hi, In start.S file irq_handler code is used for handling the irq interrupts though iam able to handle the interrupt, iam not able to restore the previous state. irq_restore_user_regs label is given generally in all u-boots for restoring the state but not happens. Please do needful how i come out from this.

Thanks balaji