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On Sun, Jun 30, 2002 at 06:25:56AM +0200, Klaus Heinz wrote:
> Hi,
>=20
> I am unfamiliar with gcc/as assembler syntax (gcc 2.95.3, as 2.11.2,
> NetBSD 1.6_BETA3). The following code has a problem:
>=20
>   int vgar(volatile caddr_t ba, int idx)
>   {
>   register int erg;
>   asm volatile ("movel %1, a0;\
this should be %a0 (or escaped version thereof).
>                   movel %2,d1;
this should be %d1 (or escaped version thereof).
>                   movel a0@(d1), %0;" :\
>                   "=3Dr" (erg):\
>                   "g" (ba), "d" (idx) :\
>                   "a0", "d0", "d1");
this should be %a0, %d0 and %d1 (or escaped version thereof).
>   return erg;
>   }
>=20
>=20
> This gets translated into:
>=20
>   ...
>   #APP
>           movel %d2, a0;                movel %d3,d1;
>                   movel a0@(d1), %d2;
>   #NO_APP
>   ...
>=20
> and 'as' complains about:
>=20
>   /tmp/cc1Pws5c.s:41: Error: syntax error -- statement `movel a0@(d1),%d2=
' ignored
>=20
>=20
> From what I have found, I think every register name should be preceded by
> a '%' (%% in the C source file).
>=20
> Without the % in front of the register names, 'as' translates the above
> (according to objdump) to:
>=20
>   10:   23c2 0000 0000  movel %d2,0 <vgar>
>   16:   23c3 0000 0000  movel %d3,0 <vgar>
>   1c:   2430 0170 0000  movel %a0@(00000000),%d2

yes, because without the prefix the assembler doesn't know it is a=20
register. This is the new toolchain.

>=20
> which seems not to be the intended output:
>=20
>   10:   2042            moveal %d2,%a0
>   12:   2203            movel %d3,%d1
>   14:   2430 1800       movel %a0@(00000000,%d1:l),%d2
>=20
>=20
> Can someone confirm this?
>=20
> As the cvs log tells me this functions's file was last modified in 1997,
> I suppose there has been some change in assembler syntax since then?
yes.
=20
Regards,
	Ignatios

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