Hi,
You can look in C:\Program Files\Freescale\CodeWarrior for ColdFire V7.0\Help.
You'll see ColdFire_Build_Tools_Reference.chm which has the calling conventions info.
There is also Targeting_ColdFire.chm which has some of that information as well.
You might also find these in PDF format in C:\Program Files\Freescale\CodeWarrior for ColdFire V7.0\Help\PDF, though some of mine appear to be corrupt after installation. I have found uncorrupt PDFs searching the freescale.com website.
For information on the exception frames (for after you crash), check out chapter 11 of "ColdFire® Family Programmer’s Reference Manual" -- that'll tell you the details of why you crashed.
Good luck!
-- Rich