[avr-gcc-list] GCC guru question (progue/epilogue sequences)

[Marko Panger]

Hi all !!

 

I realy hope somebody could answer the following question. I will try to explain the situation and my problem.

 

So... I am writting a RTOS and I would like to have interrupt handlers written in C language. If I define a function as a INTERRUPT or SIGNAL the compiler generates the prologue/epilogue sequence automaticaly. But I don't need this. Registers saving an restoring is managed by my kernel.

 

There is another possibility. I could decalre the interrupt function with NAKED attribute. This would be fine for me since the compiler doesn't generate the prologue/epilogue sequence. But here comes the problem. What will happen if I decalare some local variables wich are putted on the stack ?

 

I was wondering if is possible to write my own pro/epi sequences ? How will I now how many variables are putted onto the stack ?