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I've added the option to save all general purpose registers, if you don't do 
this you can get stuck in some loops + you can get bad return values!

What steps will reproduce the problem?
1. Create a thread
2. Run it
3. Let it finish

What is the expected output? What do you see instead?
I expected the timer IRQ, to keep fireing, but instead, it just stops.

Please take a look in the code to see if you can help me

I've added the option to save all general purpose registers, if you don't do 
this you can get stuck in some loops + you can get bad return values!

I've tried explain some more theory and made it up to date(changed to old code 
to the current code).

I've added the ability to save all the GPRs:
If you don't save all you're registers you can get stuck in a loop.

I've adapted:
thread.h
scheduler.h
scheduler.c
thread_asm.s

I've added the option to save all general purpose registers, if you don't do 
this you can get stuck in some loops + you can get bad return values!

BTW: Sorry for all the patch messages, I had to change quite a few different 
files.

Explanation mapping the tables and directory.

I've added the option to save all general purpose registers, if you don't do 
this you can get stuck in some loops + you can get bad return values!