Re: Address of label which is defined within an asm statement?

["Ioannis E. Venetis" <venetis at capsl dot udel dot edu>]

Thank you David and Ian,

Based on your responses I finally figured out what I had to do. It works 
now!

Best regards,

Ioannis


David Fernandez wrote:
> On Wed, 2006-06-28 at 10:45 -0400, Ioannis E. Venetis wrote:
> > Hello Ian,
> >
> > Thanks for answering this. I need to access the address of the label 
> > within the assembly code that I write. This means that I will have to 
> > check again the documentation of this architecture. I hope that I will 
> > find something.
> >
> > Best regards,
> >
> > Ioannis
> >
> > > If you have a label in assembly code, and you want to use it in
> > > assembly code, then you need to write whatever is appropriate for your
> > > assembly language (e.g., "mov #MyLabel,r0").  That is not really a
> > > compiler issue.
> > >
> > > If you have a label in assembly code, and you want to use it in C code
> > > (e.g., by doing "goto MyLabel;"), then, sorry, you can't do that.
> > >
> > > Ian
>
> To obtain the label address could be somthing like "mov #MyLabel, %<n>"
> or "mov $MyLabel, %<n>" with <n> the output parameter number where you
> get the result like : "=g" (MyLabelAddressVar).
>
> To call a label from C code can be done using
> 	goto *MyLabelAddressVar
> I think that is a C Extension feature of gcc... You cold also pass the
> value to another assembler block to do the trick, but that would be
> architectural dependent some way...
> 	"jmp *%0"
> 	:
> 	: "r" (MyLabelAddressVar)
>
> David.