Re: Assembly macro with parameters

[Daniel Jacobowitz <dan@debian.org>]

On Fri, Apr 08, 2005 at 06:47:58PM +0200, Fabrizio Fazzino wrote:
> Ralf Baechle wrote:
> >Fabrizio Fazzino wrote:
> >
> >>It works, but I need a way to set the values of the parameters
> >>at runtime; so I've tried the following macro:
> >>
> >>	#define fzmin(rd, rs, rt) asm("lwc1 $rt, rd<<11($rs)");
> >
> >Which will leave the assembler entirely unimpressed ;-)
> 
> I thought that the compiler was able to substitute also the
> values inside strings... Is there any way to force it to do so?
> 
> >Unless you only have a few instructions and are going for a quick hack
> >I really suggest to add proper support for these instructions to binutils.
> >Having working support in as, gdb, objdump will make your life so much
> >easier.
> 
> The processor I'm designing probably will not be implemented in
> any way (we just have to simulate the VHDL hardware description),
> so we just need a quick-and-dirty way to make the opcode
> conversion.

You should probably be using .word then, and generating the instruction
completely by hand.

-- 
Daniel Jacobowitz
CodeSourcery, LLC