Mentor Graphics would like to contribute the attached libffi port for 
the Altera Nios II processor.  It passes the testsuite except for the 
uninitialized variable bug I posted a fix for the other day:

https://sourceware.org/ml/libffi-discuss/2013/msg00179.html

Unfortunately, the Nios II GCC port hasn't been committed to the FSF 
repository yet; it's been accepted by the steering committee but is 
still stuck awaiting technical review.  I used Mentor's GCC 4.7-based 
toolchain for testing instead.

-Sandra