It contains the last known value of the stack pointer for a given thread.
It is used by the garbage collector to determine the active part
of that thread's stack, which has to be scanned conservatively.

	- Godmar

> 
> what 's the use of restorePoint in ctx in thread implementation of Kaffe
> ?
> I can't understand it .
> can u give a reply ?
> thanks !
> 
> 
>