I have read some where recently that an ISR can have separate stack also i.e. an ISR need not share the stack of interrupted process. What I was thinking till now is, an ISR shares the stack of the process which was executing when the interrupt occured and ISR got invoked, thats why things are in fragile state when ISR is executing.
My question is:
Is it true that, an ISR can have seperate stack? If yes then please provide me pointers/link to the details. if no then why not? Won't life be easier if the ISR have their own stacks? I know may be this is not feasible on machines with less memory.
