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Date: Mon, 16 Apr 2007 18:01:04 +0300
From: "Blue Swirl" <blauwirbel@gmail.com>
Subject: Re: [Qemu-devel] qemu/pc-bios README openbios-sparc32 openbios-s...
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To: qemu-devel@nongnu.org

On 4/16/07, Daniel Jacobowitz <drow@false.org> wrote:
> On Sun, Apr 15, 2007 at 10:37:08PM +0300, Blue Swirl wrote:
> > On 4/15/07, Paul Brook <paul@codesourcery.com> wrote:
> > > On Sunday 15 April 2007 20:11, Blue Swirl wrote:
> > > > > Probably the linker is making sure the file offset and VMA are the same
> > > > > modulo the page size.
> > > >
> > > > But that would be one huge file, as the VMA is near 2TB:
> > >
> > > I said *modulo the pace size* :-)
> > > Lets say ld thinks the page size for your system is 1Mb (nor an unreasonable
> > > assumption).  The vma of .text is aligned on a 1Mb boundary. In order to
> > > allow loading via mmap, the location of .text within the file must also be
> > > aligned on a 1Mb boundary. It can't put it at address zero because the ELF
> > > headers get in the way, so the first viable location is 1Mb into the file.
> >
> > Nice theory (and I missed the modulo arithmetic, sorry), but on
> > Ultrasparc the page sizes available are 8k, 64k, 4M and 256M.
>
> #define ELF_MAXPAGESIZE 0x100000
>
> BFD and GNU ld think it's 1MB.

I stand corrected. Is there anything that can be done to reduce this waste?