What pragma can you use? I couldn't find that in the docs.

I did use the naked function OK in the ISR of the code I was working on today. Seemed to be OK.

Actually a better question would have been about good shareware/freeware simulators that work well alongside SDCC. The main reason I am going back to my other setup for now is that I had problems using JSIM as the other half of my coding / testing loop (it seems to have a problem with mixed asm and C).