Re: [Qemu-devel] Using GDB to debug the sparc64 target

[Blue Swirl]

On 1/11/09, Jakub Jermar <address@hidden> wrote:
> Hi,
>
>  I'd like to help with debugging the sparc64 target (to get HelenOS
>  run on it). I'd like to use gdb for that purpose, however, I get
>  the following error when I try to connect to qemu from gdb:
>
>  GNU gdb 6.8
>  Copyright (C) 2008 Free Software Foundation, Inc.
>  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
>  This is free software: you are free to change and redistribute it.
>  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
>  and "show warranty" for details.
>  This GDB was configured as "--host=i686-pc-linux-gnu 
> --target=sparc64-linux-gnu".
>  (gdb) target remote localhost:1234
>  Remote debugging using localhost:1234
>  [New Thread 1]
>  Remote 'g' packet reply is too long: 
> 00000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
>  
> 00000000000000000000000000000000000000000000000000000000000000000000000000001fff0000020000001fff00000240000000000000407000000000000000000000000000000000000000000000000
>
>  Is this a known issue? Is there a workaround for this?
>  The qemu version I am running is trunk, the host is
>  an ordinary ia32 system.

The register size is still incorrect (32 bits) in the GDB you
produced. Also I can't make a working cross-gdb. The problem is on GDB
side: on Sparc64 OpenBSD, where everything is 64 bits, there is no
problem and the protocol matches what Qemu produces.

I'd be happy to be proven wrong, though. Currently my OpenBSD setup is
slightly broken, so this comes from memory.