Write a subroutine in pic18f assembly language at address

Question

Question: Write a subroutine in PIC18F assembly language at address 0x200 to perform (X² + Y²), where X is a signed 8-bit number and Y is an unsigned 8-bit number. Use subroutine for signed multiplication in PIC18F assembly as needed. Also, write the main program at address 0x100 in PIC18F assembly language that will initialize FSR0 to 0x0070, X and Y to arbitrary data, initialize STKPTR to 0x10, call the subroutines to compute (X² + Y²), and then push 8-bit result onto the software stack pointed to by FSR0.