Regarding GOT table in PIC code

[Chethan Palakshamurthy]

Thanks Ian, Andrew.

- chethan

On Tue, Jan 10, 2012 at 10:31 PM, Ian Lance Taylor <iant@google.com> wrote:
>
> Chethan Palakshamurthy <pchethan@gmail.com> writes:
>
> >>> 1. Does the dynamic linker map the physical pages for .data segments
> >>> such that GOT is at a fixed offset from code in logical address space?
> >>> is this true?
> >>
> >>Yes, it has to do this or it wouldn't be possible to find the GOT.
> >
> > So, this method of paging is what makes it possible to share code
> > pages across processes? Several sources online(/books) mention that
> > PIC is the one which make code sharing across processes possible.
>
> I would not say that it's the method of paging that makes that
> possible.  That is merely a detail in how the GOT is implemented.
>
> The GOT makes sharing possible because it separates the final address of
> the variable from the code.  Thus the code can be shared even though the
> address of the variable will be different in different processes.
>
> Ian