[patch][0/5] powerpc V2 : Add support to fully comply with IEEE-754 standard

[Zhu Ebony-r57400]

Hi Paul,

These are the re-sent patches to add support to fully comply with
IEEE-754 standard for E500/E500v2 core when hardware floating
point compiling is used. Comparison with last patches I've submitted,
the following points was changed:

1. Add a rounding exception handler, to handle the exceptions that
would occur when rounding towards +Inf/-Inf

2. Using the existing exception entering/returning routine, and get the
exception
instructions from regs->nip instead of reading from SRR0

Thank you all for the comments you gave to me!

B.R.
Ebony