Re: [Qemu-devel] Porting QEMU to PalmOS

["Jonathan Kalbfeld" <jonathan.kalbfeld@gmail.com>]

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Wow, if you can make this work I will be thrilled.  I <3 my Treo 650.

jonathan

On 5/23/07, Wolfgang Schildbach <Wolfgang.Schildbach@codingtechnologies.com>
wrote:
>
> Try compiling as position-dependent (i.e. not PIC) code. GOT is a typical
> feature of position independent code.
>
> - Wolfgang
>
> qemu-devel-bounces+wolfgang.schildbach=codingtechnologies.com@nongnu.org
> wrote on 23.05.2007 13:20:22:
>
> > Hi Johannes,
> >
> >    thanks for your quick response.
> > I thought QEMU was already compiled and run on an ARM machine?
> > If so, how come that noone else had such problem (I searched for it
> > on google),
> > and PXA255 is a standard ARM CPU with a few additional instructions.
> > And how to make them not come from GOT, those vars are declared as
> extern,
> > so they are globals?
> >
> > BR,
> >    Voda.
>
> > ----- Original Message ----
> > From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
> > To: sinisa marovic <sinisamarovic@yahoo.com>
> > Cc: qemu-devel@nongnu.org
> > Sent: Wednesday, May 23, 2007 12:48:59 PM
> > Subject: Re: [Qemu-devel] Porting QEMU to PalmOS
>
> > Hi,
> >
> > On Wed, 23 May 2007, sinisa marovic wrote:
> >
> > > Relocation types that fail are 25 and 26, which are R_ARM_GOTPC and
> > > R_ARM_GOT32 respectively. Their names are:
> > >
> > > _GLOBAL_OFFSET_TABLE_
> > > cc_table
> > > __op_param1
> > > __op_param2
> > > __op_param3
> > >
> > > Is there a way to fix this?
> >
> > The GOT is an offset table. Many CPUs have fixed-size instruction sets,
> > which means that you cannot easily jump to an absolute address, since
> the
> > address alone would already fill up the size.
> >
> > Of course, this is a no-no for QEmu, since the _same_ function snippet
> > will be reused _multiple_ times. So, the address must not come from a
> GOT,
> > but be inserted directly into the code.
> >
> > I do not remember off-hand how I managed to do this a couple of years
> ago,
> > when I worked on a MIPS host, but there _are_ gcc options to avoid a
> GOT.
> >
> > Hth,
> > Dscho
> >
> >
> > Food fight? Enjoy some healthy debate
> > in the Yahoo! Answers Food & Drink Q&A.
>
>
>
>


-- 
--
Jonathan Kalbfeld
+1 323 620 6682

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