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Routine calls in Arm

Note: This was originally posted on 19th July 2010 at http://forums.arm.com

I have a quetion about mechanism used while making nested routine calls in ARM based products.

Say suppose at an instant my core is executing the routine A and routine B is invoked by encountering the instruction.

As it tells, the address of the immidiate instruction of routine A from where the execution turned its stream towards B is stoed on list register. Uptill this it is clear like crystal.

But what if now while routine B is executing any interrupt occurs or any call is made to say routine C . . .
Now we need to store the address of the next instruction of the B routine . .
If we store it onto the list register then how can we preserve its previous value which points to immediate instruction of routine A.

Pls eloberate on this.

Thanks in advance,