# subroutine call: b = fact( a )
                                  #   7. No T registers to push
         lw      $a0,0($fp)       #   8. Put argument into $a0
         jal     fact             #   9. Jump and link to subroutine
         
                                  # return from subroutine 
                                  #   10. No T registers to restore
                                  
         sw     $v0,4($fp)        # b = fact( a )

More main()

Next main() does some routine things:

                       
                                  # print( b )
         lw     $a0,4($fp)        # load b into $a0
         li     $v0,1             # print integer service
         syscall                                  
                                  # end the print line
         li     $v0,4             #   print string service
         la     $a0,lf            #   address of line feed
         syscall

Finally, main() ends with a subroutine epilog.

                       
                                  # epilog
         li    $v0,10             # 11. return to QTSPIM
         syscall

The data for the prompts is not stored on the stack.

                       
         .data
prompt1: .asciiz "enter an int:"
prompt2: .asciiz "factorial is:"
lf:      .asciiz "\n"