Re: [Qemu-devel] Problem with PPC user emulation.

[Jocelyn Mayer <l_indien@magic.fr>]

On Fri, 2004-05-14 at 21:26, Karel Gardas wrote:
> On Fri, 14 May 2004, Jocelyn Mayer wrote:
> 
> > On Fri, 2004-05-14 at 19:59, Karel Gardas wrote:
> > > Hello,
> > >
> > > I've tried PPC user emulation provided by this week source tree, but w/o
> > > success. I've tested crosstool's 4 test binaries (hello world in c/c++
> > > static and dynamic) but all four crash with:
> > >
> > > thinkpad:/mnt/karel/cross-gcc/result/powerpc-405-linux-gnu/gcc-3.4.0-glibc-2.3.2/tmp$ ppc.sh ./powerpc-405-linux-gnu-hello
> > > *** ERROR: idx a0 already assigned to a direct opcode
> > > *** ERROR: unable to join indirect table idx [a0-37]
> > > *** ERROR initializing PPC instruction 0xa0 0x37 0xfe
> > > /opt/qemu-scripts/bin/ppc.sh: line 3:  3496 Segmentation fault      qemu-ppc -L /mnt/karel/cross-gcc/result/powerpc-405-linux-gnu/gcc-3.4.0-glibc-2.3.2/powerpc-405-linux-gnu/ $@
> > > thinkpad:/mnt/karel/cross-gcc/result/powerpc-405-linux-gnu/gcc-3.4.0-glibc-2.3.2/tmp$
> > >
> > > I used crosstool-0.28-pre13 for building ppc crosscompiler which is
> > > gcc3.4.0 and glibc2.3.2 combination.
> > >
> >
> > What is your host machine ?
> 
> Debian GNU/Linux 3.0.

On a PC ?

> 
> > It seems there is a mess in the way sections are handled by this gcc
> > version and/or for your host machine.
> > This seems clear to me, because there can be no instruction with this
> > opcode, as major opcode is 6 bits long in PPC and so can't be 0xa0.
> >
> > Could you please send me the qemu binary by mail, so I could check the
> > executable structure (the opcode table structure, in fact...) ?
> 
> Sure! I will send you the smaller one (C statically linked hello world
> app)

Well, I need the Qemu executable, not the emulated program, because the
point you report is a bug inside qemu: it stops before trying to execute
any emulated code, and I want to study the way it's been compiled by
gcc...

> > But you may not be able to execute PPC405 dedicated binaries,
> > as this CPU implements some instructions that aren't in the PPC spec
> > then not emulated by Qemu.
> 
> Aha! This might be the issue.

This is not the issue for your crash, but you may have other problems
later, using PPC405 binaries. I will had the 405 dedicated instructions
later, when the PPC core will more stable (I still have ennoying bugs to
solve).

-- 
Jocelyn Mayer <l_indien@magic.fr>
Never organized