[PATCH] powerpc/vdso64: inline __get_datapage()

[Christophe Leroy]

Le 21/08/2019 à 14:15, Segher Boessenkool a écrit :
> On Wed, Aug 21, 2019 at 01:50:52PM +0200, Christophe Leroy wrote:
>> Do you have any idea on how to avoid that bcl/mflr stuff ?
> 
> Do a load from some fixed address?  Maybe an absolute address, even?
> lwz r3,-12344(0)  or similar (that address is in kernel space...)
> 
> There aren't many options, and certainly not many *good* options!
> 

IIUC, the VDSO is seen by apps the same way as a dynamic lib. Couldn't 
the relocation be done only once when the app loads the VDSO as for a 
regular .so lib ?

It looks like it is what others do, at least x86 and arm64, unless I 
misunderstood their code.

Christophe