SWT Interrupt handler

Hello, I am working on NXP S32v234 EVB2. (Board Used - s32v234 evb 29288, DTB file - s32v234-evb28899, QNX7.0). I am working on SWT (watchdog timer). I have successfully configured and tested SWT4 but now I am interested to implement it using ITR(Interrupt then Reset). When I enable ITR bit of SWT_CR in uboot then I can see its effect on SWT working but as I want to edit its handler now for my application but unable to find its interrupt handler (ISR routine). There are handlers written for other peripherals e.g. I2C, PCI etc…but unable to find SWT handler. Can anyone help me hoe can I find its handler in QNX BSP?