PIE binaries are no longer mapped below 4 GiB on ppc64le

[Benjamin Herrenschmidt]

On Wed, 2018-10-31 at 18:54 +0100, Florian Weimer wrote:
> 
> It would matter to C code which returns the address of a global variable
> in the main program through and (implicit) int return value.
> 
> The old behavior hid some pointer truncation issues.

Hiding bugs like that is never a good idea..

> > Maybe it would be good idea to generate 64bit relocations on 64bit
> > targets?
> 
> Yes, the Go toolchain definitely needs fixing for PIE.  I don't dispute
> that.

There was never any ABI guarantee that programs would be loaded below
4G... it just *happened*, so that's not per-se an ABI change.

That said, I'm surprised of the choice of address.. I would have rather
moved to above 1TB to benefit from 1T segments...

Nick, Anton, do you know anything about that change ?

Ben.