Re: [Xen-devel] [PATCH 2/2] make use of .startof.() and .sizeof.() assembler expressions

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 12/08/16 15:48, Jan Beulich wrote:
> Section start symbols frequently obscure the actual symbol name living
> at the start of the section. Eliminate them where they can be replaced
> by linker resolved .startof.* symbols. (Section end symbols may have
> the same undesirable effect, but they're less easy to eliminate, as
> they'd need to be represented by the sum of .startof.<section> and
> .sizeof.<section>).
>
> Along those lines use .sizeof.* where section sizes get calculated
> from the difference of section and and section start symbols.
>
> Note that this would be nice for the build-id section too, but:
> - The generated (by ld) section names differ between ELF and COFF/PE
>   (ELF: .note.gnu.build-id; COFF/PE[2.26+]: .buildid), yet we compile
>   version.c just once (and hence can use only either of the necessary
>   .startof./.sizeof. forms).
> - The ELF section name needs to be quoted in the .startof./.sizeof.
>   expressions, yet that quoting is supported only by gas 2.26+.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Is there any documentation of these?  I cant seem to find any.

Does this work on Clang at all?

~Andrew

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