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PATCH: Map GNU attributes section to PT_GNU_ATTR (aka PT_GNU_STACK) segment

Daniel Jacobowitz drow@false.org
Thu Aug 16 13:44:00 GMT 2007 
On Thu, Aug 16, 2007 at 06:20:50AM -0700, H.J. Lu wrote:
> Not if the size of GNU_ATTR is 0.

It is unlikely to be in the future.  I expect we will use this
mechanism for many platforms.  We already do on ARM, MIPS, and Power.

> > How are you planning to use this in the loader, and have you discussed
> > it with the glibc maintainers at all?
> 
> My patch only makes the existing info available to run-time loader.
> It is up to run-time loader to decide if it wants to look at it.
> At the moment, I don't have an attribute the run-time loader has
> to check. But things may change in the future. 

If the run time loader wants to check, your mechanism will not be
suitable.  There's no chance that glibc will do an extra mmap or
seek/read to get at this information.

I don't think this patch is a good idea.  I would prefer to back it
out until there is a clear use case and support from at least one
consumer.

> Assuming we want to make the attribute section SHF_ALLOC, what kind
> of problem will it cause for ARM EABI?

Apparently none; the EABI does not specify that the section is
non-ALLOC.

-- 
Daniel Jacobowitz
CodeSourcery
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