[ PATCH] Extend mode-switching to support toggle (1/2)

[Christian Bruel]

Hello,

He is a new version of the patch. It hookizes the mode-setting and
mode-toggling macros. Split in 2 parts.

Successfully bootstrapped/regtested on ix86 and SH4/SH4a.

I was able to do a limited build on Epiphany, if someone could give it a
try on it that would be great.

comments ? suggestions ?

many thanks,

Christian









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