ramanujan@dec-verdi.UUCP (04/22/86)
>What is a "red and green" stack violation? I've heard references to this >over the years, but no one has given me a satisfying explanation. >Does it exist only on obscure members of the PDP-11 family, or is it a >common, universal condition to which DEC has assigned a cute name? >(I may have the colors wrong. I'm colorblind anyway. :-) The colors I have heard of in reference to stack violations in the PDP-11 world are 'red' and 'yellow' . These are meant to protect the kernel mode stack . The following is my understanding of what these traps are : - If the virtual address of a kernel stack reference is less than 400 (octal) , a 'yellow' stack trap occurs at the end of the instruction making the reference. - If an abort of any kind occurs during a push to kernel stack due to an interrupt,trap or another abort sequence a 'red' stack trap will occur. Raj_Ramanujan *********************************************************************** General Disclaimer : The opinions expressed above are mine alone ....