how to return from FIQ ISR in assembly?

I am writing an assembly FIQ ISR using GCC complier. I want to change return address in FIQ ISR so that after ISR, it returns to the requested address. the reason for doing that is because i am writing a RTOS.

what are the instruction for ISR return in assembly? is it

 SUBS PC, R14, #4

? i know in 8051, noraml function call return is RET, ISR return is RETI.