GNU AS inline question

GNU AS inline question

[Rich DAddio]

I am doing an os port along with a migration to gcc on a basic RISC. And I
am not quite sure if this is the right list for this question so upfront
apologies it this is not appropriate.

Inside one of the low-level init routines is a function and a piece of
inline assembly for a proprietary compiler assembler:

int storeIt;
void theInitCFunction()
{
  //inline assembly
  _AS("st %mp, [storeIt]");
}

Which stashes the value of mp.

Is there an easy way to do the same thing inline with gcc/as?? Do I have to
use extensions?


Thanks,

Rich D

Re: GNU AS inline question

[Ian Lance Taylor]

"Rich DAddio" <richdaddio@sandvideo.com> writes:

> I am doing an os port along with a migration to gcc on a basic RISC. And I
> am not quite sure if this is the right list for this question so upfront
> apologies it this is not appropriate.
> 
> Inside one of the low-level init routines is a function and a piece of
> inline assembly for a proprietary compiler assembler:
> 
> int storeIt;
> void theInitCFunction()
> {
>   //inline assembly
>   _AS("st %mp, [storeIt]");
> }
> 
> Which stashes the value of mp.
> 
> Is there an easy way to do the same thing inline with gcc/as?? Do I have to
> use extensions?

http://gcc.gnu.org/onlinedocs/gcc-3.2.2/gcc/Extended-Asm.html#Extended%20Asm

Ian

Re: GNU AS inline question

[Daniel Jacobowitz]

You probably want to look at the GCC manual, which has a chapter on
inline assembly.  You can do the same thing, but the syntax will be a
little different.  At a guess, probably something like:
  asm ("st %%mp, %0" : "=m" (storeIt));

On Wed, May 07, 2003 at 02:54:34PM -0400, Rich DAddio wrote:
> I am doing an os port along with a migration to gcc on a basic RISC. And I
> am not quite sure if this is the right list for this question so upfront
> apologies it this is not appropriate.
> 
> Inside one of the low-level init routines is a function and a piece of
> inline assembly for a proprietary compiler assembler:
> 
> int storeIt;
> void theInitCFunction()
> {
>   //inline assembly
>   _AS("st %mp, [storeIt]");
> }
> 
> Which stashes the value of mp.
> 
> Is there an easy way to do the same thing inline with gcc/as?? Do I have to
> use extensions?
> 
> 
> Thanks,
> 
> Rich D
> 
> 

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

Re: GNU AS inline question

[Eric Christopher]

On Wed, 2003-05-07 at 11:54, Rich DAddio wrote:
> I am doing an os port along with a migration to gcc on a basic RISC. And I
> am not quite sure if this is the right list for this question so upfront
> apologies it this is not appropriate.
> 

Wrong list, but close enough this time :)


> Is there an easy way to do the same thing inline with gcc/as?? Do I have to
> use extensions?

http://gcc.gnu.org/onlinedocs/gcc-3.2.2/gcc/Extended-Asm.html#Extended%20Asm

-eric
-- 
Eric Christopher <echristo@redhat.com>