tfm.h contains declarations for the public part of the library.
tfm_private.h contains the function which are private to tfm and should
not be exposed to the public.
Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Previous patch modified constraints from =m to =g. Turns out this also
allows registers which doesn't work with the inline assembly
instructions.
If we change back to =m GCC 5.0 warns that constraints do not allow a
register.
In order to work around these issues we now pass the arguments in
registers and let GCC handle the loading & storing.
