Trying to get gdbserver to connect

rahulthewall3000 · 07-28-2008, 08:19 AM

My problem is that I have a virtual ARM platform to which I ported the Linux Kernel. Then I created a filesystem using MontaVista tools and packaged it with the necessary software.
What I want to do is debug applications on the target machine from the host machine. The only solution that I could find for this was gdbserver.
But, I cannot connect to my virtual machine.

First of all, here are my network configurations.

*Host Machine*

Code:

bash-3.00$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:13:D4:03:95:80
          inet addr:192.168.10.78  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::213:d4ff:fe03:9580/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:68244461 errors:407 dropped:0 overruns:0 frame:0
          TX packets:86167715 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:651299170 (621.1 MiB)  TX bytes:31556850 (30.0 MiB)
          Interrupt:5 Base address:0xa000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:164464503 errors:0 dropped:0 overruns:0 frame:0
          TX packets:164464503 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:845988992 (806.7 MiB)  TX bytes:845988992 (806.7 MiB)

*Virtual Platform*

Code:

# ifconfig 
eth0      Link encap:Ethernet  HWaddr 52:54:00:12:34:56  
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1180 (1.1 KiB)  TX bytes:1180 (1.1 KiB)
          Interrupt:25 Base address:0x2000 DMA chan:ff 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Now, I fire up gdbserver on the target machine using this command:

Code:

gdbserver host:2345 ./fun

Then I try to connect to the virtual platform from the host machine.

Code:

target remote :2345

I do this after redirecting the port 2345 to communicate with the port 2345 of the virtual platform.

What I get as error is this:

Code:

(gdb) target remote :2345
Remote debugging using :2345
Ignoring packet error, continuing...
warning: unrecognized item "timeout" in "qSupported" response
Ignoring packet error, continuing...
Ignoring packet error, continuing...
Ignoring packet error, continuing...
Malformed response to offset query, timeout

If anybody can explain as to what is going wrong, I would be really grateful.

Thanks
Rahul

rahulthewall3000 · 07-28-2008, 08:32 AM

Also, it seems that my virtual machine is inaccessible via the host machine.

Code:

bash-3.00$ ping 10.0.2.15
PING 10.0.2.15 (10.0.2.15) 56(84) bytes of data.
From 87.234.11.217 icmp_seq=6 Destination Net Unreachable
From 87.234.11.217 icmp_seq=7 Destination Net Unreachable
From 87.234.11.217 icmp_seq=16 Destination Net Unreachable

--- 10.0.2.15 ping statistics ---
18 packets transmitted, 0 received, +3 errors, 100% packet loss, time 16998ms, pipe 2

rahulthewall3000 · 08-20-2008, 04:45 AM

The problem was with the ethernet controller, and not with gdbserver. Solved.