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Re: [patch] MIPS gas problems with gcc's explicit relocs
On Fri, 4 Jun 2004 cgd@broadcom.com wrote:
> > > - Work around the problem by not using "m" constraints for (d)la in
> > > the inline assembler, that is instead of
> > >
> > > asm("dla\t%0,%1" : "=r" (result) : "m" (foo));
> > >
> > > something like
> > >
> > > asm("dla\t%0,foo" : "=r" (result));
> >
> > I like this I think the most. It fits with what people are trying to do
> > with the la instruction, i.e. load an address for a symbol that they
> > know.
[...]
> assuming there are no other references to 'foo' in the file, this can
> lose w/ unit-at-a-time compilation (e.g., if 'foo' is a static data
> object). Need to reference 'foo' from C code.
>
> Also, historically speaking, putting 'foo' in the asm might have been
> a bad idea, because of of the question of underscores or not at the
> start of C symbols. Nicer to let the compiler take care of it for
> you. (not clear that this matters today, though.)
I suppose this should work anyway with the asm label GCC extension, like
this:
int foo asm ("foo");
It doesn't work for automatic variables, though (no surprise).
--
+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+--------------------------------------------------------------+
+ e-mail: macro@ds2.pg.gda.pl, PGP key available +