Assembly interrupt handlers in a C application? (mfarver)

Is there a way to have "all assembly" interrupt handlers in a C project? I created a .s file with the following: .global __T1Interrupt
__T1Interrupt:
btsc _appflag,0
goto 0x5000 + 0x30
goto 0x10000 + 0x30 but when I look at the prog..