Re: [Xen-devel] [PATCH v4 1/7] x86: provide executable fixmap facility

[Wei Liu <wl@xxxxxxx>]

On Wed, Jan 29, 2020 at 03:59:32PM +0100, Jan Beulich wrote:
[...]
> >> I seem to recall recommending to export absolute symbols from
> >> assembly code. The question is how easily usable they would
> >> be from C, or how clumsy the resulting code would look.
> > 
> > Even if I use absolute symbol I would still need to define a macro for
> > it. There is no way around it, because enum can't be used in asm or
> > linker script.
> 
> I'm afraid I don't understand. Why a macro? The absolute symbol would
> be there to communicate the relevant (enum-derived) value to the
> linker script. I.e. with
> 
> enum { e0, e1, e2 };
> 
> in some C file
> 
> asm ( ".equ GBL_e2, %c0; .global GBL_e2" :: "i" (e2) );
> 
> which I then hope would allow you to use GBL_e2 in the linker
> script ASSERT().
> 

OK. Let me see if this is possible.

Wei.

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