> 3. Position independence is still problem.
>
> > - In SH4 asm, the MOVA is hidden behind a normal mov.l without a base
> > register, so in fact, it is used very often.
>
> Can't confirm this. Well, I can see now that it extensively uses 'mov.l
> @(disp,PC),Rn' for loading constants, but no mova... I.e. following is
> position-independent:
>
> mov.l label,rx
>
> label:
> .long xxxx
>
> Only[!] as long as xxxx is *not* another label, in which case a
> relocation record is generated voiding position independence.
>
>
> => I know, nevertheless, if you compile code on SH4 with gcc with -PIC,
> then the same apply, so currently, I don't see the point to make real
> PIC code on this CPU.
I can not confirm this, i.e. that gcc -fPIC generates
non-position-independent code on SH4 platform. At least code generated
by 3.4.6 is perfectly position-independent and there are no constructs
as above with xxxx being another label, it's always *offset* to the
other label. In other words if you want to pull reference to a [distant]
table you'd go:
mova pic_label,r0
mov.l @r0,rx
add r0,rx
...
pic_label:
.long table-pic_label
A.
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