Issues debugging remote leon3 system

[Orlando Arias]

Greetings,

Further providing information, I have found the following whilst
debugging the issue:

At some point, gdbserver sends the following string:
$T050e:0*,;1e:0*"00ef90f6a0;50:0*,;51:0*,;0f:0*,;thread:p37b.37b;core:0;#54

and gdb attempts to process:
T050e:0000000000000000;1e:0008a6a000080e14;50:0000000000000000;51:0000000000000000;0f:0000000000000000;thread:p37e.37e;core:0;

At the moment, I am not sure as to what I am looking at. I will continue
working on finding the root cause. If anybody has any ideas, please let
me know. Thank you.

Cheers,
Orlando.

On 01/15/2015 03:41 PM, Orlando Arias wrote:
> Greetings,
> 
> In hope anybody is seeing this, I have updated to GDB 7.8.2 and the
> issue is still persistent. I am configuring gdb in its own build
> directory with
> 
> mkdir gdb-build && cd gdb-build
> ../configure --prefix=/usr \
> 	--target=sparc-leon3-linux \
> 	--host=x86_64-unknown-linux-gnu \
> 	--build=x86_64-unknonw-linux-gnu \
> 	--with-sysroot=/usr/sparc-leon3-linux \
> 	--without-guile \
> 	--disable-nls \
> 	--with-python=/usr/bin/python2 \
> 	--with-system-readline
> 
> and gdbserver as a separate package with
> ../configure --prefix=/usr \
> 	--build=x86_64-unknown-linux-gnu \
> 	--host=sparc-leon3-linux \
> 	--program-prefix="" \
> 	--disable-nls
> 
> Please let me know if I am missing something. Thank you.
> 
> Cheers,
> Orlando.
> 
> 
> 
> On 01/09/2015 11:23 AM, Orlando Arias wrote:
>> Greetings
>>
>> I have a Spartan6 FPGA in a Xilinx SP605 board configured with a stock
>> Leon3 SPARC processor. Currently, I am running GNU/Linux on the device
>> (kernel version 3.14.26, uClibc version 0.9.33.2, BusyBox 1.23.0) and I
>> am attempting to run gdbserver on the device.
>>
>> Whenever I try to connect remotely through TCP, I get the following
>> error on the GDB client:
>>
>> $ sparc-leon3-linux-gdb hw
>> GNU gdb 7.8.1
>> Copyright (C) 2014 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=x86_64-unknown-linux-gnu
>> --target=sparc-leon3-linux".
>> Type "show configuration" for configuration details.
>> For bug reporting instructions, please see:
>> <https://hardwaresecurity.org>.
>> Find the GDB manual and other documentation resources online at:
>> <http://www.gnu.org/software/gdb/documentation/>.
>> For help, type "help".
>> Type "apropos word" to search for commands related to "word"...
>> Reading symbols from hw...done.
>> (gdb) target remote leon3:1234
>> Remote debugging using leon3:1234
>> Remote register badly formatted:
>> T050e:0000000000000000;1e:00000000efc4d6a0;50:0000000000000000;51:0000000000000000;0f:0000000000000000;thread:p37d.37d;core:0;
>> here:
>> 00000000;1e:00000000efc4d6a0;50:0000000000000000;51:0000000000000000;0f:0000000000000000;thread:p37d.37d;core:0;
>> (gdb)
>>
>>
>> Attached you can find the the output of gdbserver (debugging enabled,
>> not placed here). I have done a packet capture of the protocol for an
>> ARM target and compared it to a capture for the Leon3 target and noticed
>> that there a few XML files being transmitted on the ARM target which are
>> not present in the SPARC target. I am not sure if this is necessary.
>>
>> I do not have any other SPARC units on which I can test this issue and
>> searching online and the mailing lists has yielded no results. Please
>> advice. Thank you.
>>
>> Cheers,
>> Orlando.
>>
> 

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