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Re: [PATCH] Reduce file size for PT_GNU_RELRO segment
- From: Alan Modra <amodra at gmail dot com>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>
- Cc: Binutils <binutils at sourceware dot org>
- Date: Mon, 30 Mar 2015 23:09:34 +1030
- Subject: Re: [PATCH] Reduce file size for PT_GNU_RELRO segment
- Authentication-results: sourceware.org; auth=none
- References: <20150319130244 dot GA22592 at intel dot com> <20150326022246 dot GU26234 at bubble dot grove dot modra dot org> <CAMe9rOrVpthhMfZEXcMkKzmHcxymfQHKuTuZPi_y36=s6KJ9iA at mail dot gmail dot com> <20150328041540 dot GE26234 at bubble dot grove dot modra dot org> <CAMe9rOoVzbOvdE1_apgUbHtm0gG89d3_9qbnA8=Y3Qu9MznUPA at mail dot gmail dot com> <CAMe9rOp8sdCbOp0eVzRmwMhe_3c2K0EJ6fmnMMWyA01KYamzLw at mail dot gmail dot com> <20150329034858 dot GH26234 at bubble dot grove dot modra dot org> <CAMe9rOrJB7xNLn4FEq5+N8VbnfZuYxkM4tPNMQzOKapVheGOpQ at mail dot gmail dot com>
On Sun, Mar 29, 2015 at 06:58:45AM -0700, H.J. Lu wrote:
> On Sat, Mar 28, 2015 at 8:48 PM, Alan Modra <amodra@gmail.com> wrote:
> > lang_size_sections). I think it important that we keep the relro base
> > alignment code all in one place.
>
> It is not about the base alignment. It is about setting the address of
> the first section in PT_GNU_RELRO segment, given the addresses
> of PT_GNU_RELRO segment. It is impossible to set address of the first
> section in PT_GNU_RELRO segment from lang_size_sections.
Look again at the code for exp_dataseg_relro_adjust. If you change
expld.dataseg.base there you will change addresses of sections in the
relro segment.
--
Alan Modra
Australia Development Lab, IBM