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Re: Assembly macro with parameters

To: Fabrizio Fazzino <>
Subject: Re: Assembly macro with parameters
From: Daniel Jacobowitz <>
Date: Fri, 8 Apr 2005 12:57:17 -0400
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <>
User-agent: Mutt/1.5.8i
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

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