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Re: leading padding in ELF segment

From: Nathan Sidwell <nathan at codesourcery dot com>
To: Paul Brook <paul at codesourcery dot com>
Cc: binutils at sourceware dot org
Date: Tue, 12 Dec 2006 16:06:40 +0000
Subject: Re: leading padding in ELF segment
References: <457ECEB5.2060000@codesourcery.com> <200612121600.27456.paul@codesourcery.com>

Paul Brook wrote:

I've also seen armcc generate similar things.

Many OS require the file offset to be aligned so they can use mmap, but I think that's an OS specific requirements on top of the basic ELF spec.

I thought that alignment applied to segments not sections. BFD seems slightly confused about that, in that it sets a segment's alignment from the maximally aligned contained section (and looking at the algorithm it uses, I think it only works when the first section is the maximally aligned one. Because a later section's offset depends on the sizes of the preceeding sections).

nathan
--
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

References:
- leading padding in ELF segment
  - From: Nathan Sidwell
- Re: leading padding in ELF segment
  - From: Paul Brook

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