I noticed that the test "gdb.base/pc-fp.exp: info register pc fp" was 
failing on Nios II targets because fp prints in decimal format while the 
test is expecting hex.  The attached patch fixes that by
giving register "fp" type "data_ptr" rather than "uint32".  While I was 
at it, I've made similar corrections to "gp", "ea", and "ra" 
(respectively, the global pointer, exception address, and return address 
registers).

OK for mainline?

-Sandra