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RE: Section (.sdata2) being omitted but SIZEOF(.sdata2) is not zero?
- From: Douglas Graham <douglas dot graham at ericsson dot com>
- To: Alan Modra <amodra at gmail dot com>
- Cc: "binutils at sourceware dot org" <binutils at sourceware dot org>
- Date: Tue, 21 Jan 2014 15:16:20 +0000
- Subject: RE: Section (.sdata2) being omitted but SIZEOF(.sdata2) is not zero?
- Authentication-results: sourceware.org; auth=none
- References: <E36F5062C1BCFC48B8230995895548DF02C35784 at eusaamb109 dot ericsson dot se> <E36F5062C1BCFC48B8230995895548DF02C357A9 at eusaamb109 dot ericsson dot se> <20140119092749 dot GJ5390 at bubble dot grove dot modra dot org> <E36F5062C1BCFC48B8230995895548DF02C359DC at eusaamb109 dot ericsson dot se> <E36F5062C1BCFC48B8230995895548DF02C359F8 at eusaamb109 dot ericsson dot se> <20140120045856 dot GL5390 at bubble dot grove dot modra dot org> <E36F5062C1BCFC48B8230995895548DF02C36026 at eusaamb109 dot ericsson dot se> <20140121080319 dot GQ5390 at bubble dot grove dot modra dot org>
>
> Yes, I think you've nailed it (a nice debugging effort!). We strip sections early
> based on their sizes before relaxation. Your .sdata2 section is empty except
> for the padding, and the layout before relaxation just happens to need no
> padding. After relaxation you need padding but the section with the padding
> has gone. :-(
Does this fully explain the case where both .sdata2 is missing *and* the following .data section is not aligned on a 4KB boundary? I can't find an elf file showing that at the moment, but I think I included objdump output somewhere in this thread showing it. IIRC, .data started 0x200 bytes beyond a page boundary. I think the phantom .sdata2 section was 0x400 bytes in that case.
--Doug