> - ISR modifies the > program counter on return to userspace by decrementing or > incrementing it by a fixed offset, or to a nearest multiple of > 16/whatever. >
... and similar tricks: The ISR needs to know if the value already had been modified (i.e stored) or not. So it needs to check if the PC was before or after the store instruction and have the user space function either redo the critical section or just proceed. -Michael _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
