Powerpc64 does not generate copy relocation for shared library variable

Alan Modra amodra@gmail.com
Tue Jul 30 06:23:00 GMT 2019


On Tue, Jul 30, 2019 at 10:47:32AM +0530, kamlesh kumar wrote:
> Hi Alan,
> I was expecting same behavior from ppc64 as on ppc32.
> excerpt from
> https://docs.oracle.com/cd/E19120-01/open.solaris/819-0690/chapter4-84604/index.html
> 
> Dynamic executables, however, are generally not created from
> position-independent code.
> Any references to external data they make can seemingly only be achieved at
> runtime by modifying the code that makes the reference.

Right, but ppc64 does generate PIC.

> Modifying a read-only text segment is to be avoided. The *copy* relocation
> technique can solve this reference.

Thus generally doesn't need copies of shared library variables in
.dynbss.

-- 
Alan Modra
Australia Development Lab, IBM



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