Re: [Xen-devel] [PATCH] gcov: Support gcc 4.7

[Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>]

On Mon, 2013-06-17 at 11:42 +0100, Ian Campbell wrote:
> On Mon, 2013-06-17 at 09:29 +0100, Frediano Ziglio wrote:
> > gcc 4.7 changed format used internally for coverage data.
> > This patch address these changes.
> > The information that gcc generate are mostly the same but to support common
> > sections.
> > The only difference in the blob exported by Xen is that functions have 2
> > different checksums instead of one.
> 
> Do we really need to reflect that in the Xen public API though? Could we
> condense it into the things we want/need and try and keep our API
> relatively stable? 
> 
> I'm a bit concerned that we are going to end up with dozens of variants
> of the API (and the internal code) supporting each new variant of this
> internal-to-gcc ABI.
> 
> I think you explained before why this couldn't be exported from the
> hypervisor as an opaque set of bytes to be interpreted by a userspace
> tool, which is a shame. I wonder if it is worth asking upstream if they
> have any advice.
> 
> Ian.
> 
> 

Perhaps a simple easy solution would be to allow privileged domains to
read/write arbitrary memory from Xen (write to reset counters).

Frediano



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