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Re: x86_64 ld strange behaviour.
- From: Alan Modra <amodra at gmail dot com>
- To: Markus Duft <mduft at gentoo dot org>
- Cc: binutils at sourceware dot org
- Date: Sat, 27 Nov 2010 00:07:27 +1030
- Subject: Re: x86_64 ld strange behaviour.
- References: <4CEF87B3.6000906@gentoo.org>
On Fri, Nov 26, 2010 at 11:10:59AM +0100, Markus Duft wrote:
> i did not have any such problem with the i386 linker.
You do, actually. The difference is that the i386 max page size is a
lot smaller (0x1000 vs. 0x200000), so you didn't notice it..
The information you seem to be missing is that for many targets, by
default GNU ld produces executables suitable for demand paging. This
puts constraints on file layout. For the simple case where disk page
size is equal to virtual memory page size, if you don't have file
offset modulo page size equal to vm address modulo page size, then
pages off disk can't be read directly into process memory.
--
Alan Modra
Australia Development Lab, IBM