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Re: [Qemu-devel] Porting QEMU to PalmOS

From: sinisa marovic
Subject: Re: [Qemu-devel] Porting QEMU to PalmOS
Date: Mon, 4 Jun 2007 08:33:38 -0700 (PDT)

   thanks for the tip about position-independent. I did compile with -fno-pic, and the
op.h was then generated without error. Now I have a different problem that might be
related to PIC. The thing is, because of the nature of PalmOS, I had to link with -fPIC.
Now, after removing the faults, I have reached the execution loop in cpu-exec.c and
invoking of gen_func, nothing is realy happening, the loop is being executed, but after
printing the data at the address of gen_func, I could see that there are all zeroes.
Might that be because of linking with -fPIC? If so, I will have to use different way
to link it, and it might take a while.
If not, where to search for the fault? I have also debugged the host_alarm_handler,
and found out that although realtime timer expires, it is not initialized again. Where exactly
in the code is it done? I tried to find the place, but those timer functions are structure
members, and it is hard to find a place.
----- Original Message ----
From: Wolfgang Schildbach <address@hidden>
To: address@hidden
Sent: Wednesday, May 23, 2007 5:23:51 PM
Subject: Re: [Qemu-devel] Porting QEMU to PalmOS

Try compiling as position-dependent (i.e. not PIC) code. GOT is a typical
feature of position independent code.

- Wolfgang

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
> so they are globals?
> BR,
>    Voda.

> ----- Original Message ----
> From: Johannes Schindelin <address@hidden>
> To: sinisa marovic <address@hidden>
> Cc: address@hidden
> 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:
> >
> > 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
> 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
> but be inserted directly into the code.
> I do not remember off-hand how I managed to do this a couple of years
> when I worked on a MIPS host, but there _are_ gcc options to avoid a
> Hth,
> Dscho
> Food fight? Enjoy some healthy debate
> in the Yahoo! Answers Food & Drink Q&A.

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