[Qemu-devel] Missing op on SPARC

[Qemu-devel] Missing op on SPARC

[陳韋任]

Hi, all

  I have a Linux/SPARC machine and want to run QEMU on it.
Here is the system information.

----------------------------------------------------------
$ uname -a
Linux sparc 2.6.37-rc5-git #1 SMP Tue Dec 21 17:03:53 CST 2010 sparc64 sun4v UltraSparc T2 (Niagara2) GNU/Linux
$ gcc --version
gcc (Gentoo 4.3.4 p1.0, pie-10.1.5) 4.3.4
----------------------------------------------------------

  QEMU is configured with "--sparc_cpu=v8plus". QEMU report
there are some missing op definitions. See below,

----------------------------------------------------------
$ qemu-sparc hello
Missing op definition for qemu_ld64
Missing op definition for qemu_st64
/tmp/chenwj/qemu-0.14.0/tcg/tcg.c:1116: tcg fatal error
Aborted
----------------------------------------------------------

  Is it possible to fix it? If so, how?

  Any sugguestions appreciated.

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Parallel Processing Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667

Re: [Qemu-devel] Missing op on SPARC

[Blue Swirl]

On Thu, Feb 24, 2011 at 11:12 AM, 陳韋任 <chenwj@iis.sinica.edu.tw> wrote:
> Hi, all
>
>  I have a Linux/SPARC machine and want to run QEMU on it.
> Here is the system information.
>
> ----------------------------------------------------------
> $ uname -a
> Linux sparc 2.6.37-rc5-git #1 SMP Tue Dec 21 17:03:53 CST 2010 sparc64 sun4v UltraSparc T2 (Niagara2) GNU/Linux
> $ gcc --version
> gcc (Gentoo 4.3.4 p1.0, pie-10.1.5) 4.3.4
> ----------------------------------------------------------
>
>  QEMU is configured with "--sparc_cpu=v8plus". QEMU report
> there are some missing op definitions. See below,
>
> ----------------------------------------------------------
> $ qemu-sparc hello
> Missing op definition for qemu_ld64
> Missing op definition for qemu_st64
> /tmp/chenwj/qemu-0.14.0/tcg/tcg.c:1116: tcg fatal error
> Aborted
> ----------------------------------------------------------
>
>  Is it possible to fix it? If so, how?

Yes, the place is in tcg/sparc/tcg-target.[ch].  Sparc generator for
TCG only implements the functions qemu_ld64/st64 on V9 (full 64 bit).
These should be implemented also for v8plus.

This can be implemented by adding a helper function to call the V9
versions of tcg_out_qemu_ld/st. One problem is that v8plus gives few
64 bit registers, %g1 to %g7, so addr_reg should probably be set up to
%g1 and data_reg to %g2 in the v8plus helper. Data and address must be
moved to/from these registers from/to 32 bit registers allocated by
TCG.

Re: [Qemu-devel] Missing op on SPARC

[陳韋任]

Hi, Blue

  Since my machine is UltraSparc T2, I should configure QEMU with
"--sparc_cpu=v9", right? But it gave me the error below,

ERROR: "gcc" either does not exist or does not work

  Maybe I should pass some flag to QEMU or update my gcc?

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Parallel Processing Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667

Re: [Qemu-devel] Missing op on SPARC

[Blue Swirl]

On Sat, Feb 26, 2011 at 12:07 PM, 陳韋任 <chenwj@iis.sinica.edu.tw> wrote:
> Hi, Blue
>
>  Since my machine is UltraSparc T2, I should configure QEMU with
> "--sparc_cpu=v9", right? But it gave me the error below,
>
> ERROR: "gcc" either does not exist or does not work
>
>  Maybe I should pass some flag to QEMU or update my gcc?

The logs probably tell the reason, but in general for V9 you'd need
fully 64 bit system libraries, at least for those that QEMU needs. For
example, Debian uses 32 bit userland (V8, maybe also v8plus), but
OpenBSD is fully 64 bit on Sparc64 (gcc can't even produce 32 bit
executables).

Configuring for v8 should work, since V9 CPUs can also run V8 software.