Thanks for your answer,
I assume you're running your executable as the root task.
indeed.
When the root task (or any task for that matter) starts, it doesn't have anything mapped into its address space. Upon trying to execute the first instruction it will therefore raise a page faults. This is probably the page fault you're observing in sigma0.
Can I avoid this ? I have to ask to map it to sigma0 ? Thanks one more time, xavier