> > +#define mfdcrx(rn) \
> > + ({ \
> > + unsigned long rval; \
> > + asm volatile("mfdcrx %0,%1" : "=r"(rval) : "g"(rn)); \
> > + rval; \
> > + })
>
> "g" is never correct on PowerPC, you want "r" here. You can write
> this as a static inline btw, you only need the #define stuff when
> there is an "i" constraint involved.
I think you can still use static inlines even when a
constraint is one that requires a compile time constant.
eg (not ppc, but the "n" become part of the instruction
word):
static __inline__ uint32_t
custom_inic(const uint32_t op, uint32_t a, const uint32_t b)
{
uint32_t result;
__asm__ ( "custom\t%1, %0, %2, c%3"
: "=r" (result) : "n" (op), "r" (a), "n" (b));
return result;
}
David
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