Ooops!1) - Why is the #interrupt directive ignored by the PowerPC version of GCC?
What does it do?
The direcive is of course "#pragma interrupt".
I expected it to instruct the compiler to generate a "return from interrupt" instruction at the end of the routine, instead of a "return from subroutine".
This is what happens for the SH2.
The PowerPC actually has a "rfi" instruction, but the compiler silently ignores the directive; the generated assembly code is the same and there is no "rfi" at the end of the routine.
2) - Is it possible to write an interrupt service routine in pure C language?
Yes.
Without embedded assembly?
You mean that prologue/epilogue are the same for interrupt services routines and normal functions?3) - Is there any prologue/epilogue code to be written for interrupt service routines?
No. Just the regular stuff, no blocking, quick, nested intr handling etc.
I took the decision to ask the mailing list after about one month of "googling" without finding really satisfying information (maybe there are better keywords than: GCC, GNU, EABI, interrupt, Powerpc, and so on... ;-) ).Google?
Thank you for your help! -- Mch
