RFC: ABI support for special memory area

[Florian Weimer]

On 03/16/2017 07:22 PM, H.J. Lu wrote:

>> If the latter, why can't you use the existing ELF constructor mechanism for
>> this?  As far as I understand it, the call to __gnu_mbind_setup would just
>> happen before the constructor calls.
>
> That is correct.  The issue is to access the ELF segment header for each
> loaded object only once.  There is no good way to get this info from
> constructor.

I think you can get the data in a pretty straightforward manner using 
dlinfo.

I expect that libraries such as bdwgc might want to use the 
__gnu_mbind_setup callback as well, just to register freshly loaded 
shared objects and their data sections.  Can we make this work for 
multiple users?

Thanks,
Florian