Lev Olshvang wrote:
Hello all,
I am looking for explanation of the kgdb errors and usage advice.
I am running Linux 2.6.15.5 system with a kgdb patches from the
kgfb.linsyssoft.com.
I built a kernel with ethernet driver included (not module) and KGDB
remote debug enable over Ethernet.
I am trying to strictly follow the guide I had downloaded from
linsyssoft.com
First I tried to run debug other ethernet using kgdboe parameter on boot
I built a kernel with ethernet driver included (not module) and KGDB
remote debug enable over Ethernet.
And the gdb session was stuck because the target system did not
answered to ARP requsests
for 10.0.0.3
The corresponding section from gub.conf is
title Linux-2.6.15.5-kgdb(eth)
root (hd0,0)
kernel /boot/vmlinuz-2.6.15.5-kgdb ro root=/dev/hda1
kgdb...@10.0.0.6/,@10.0.0.3/
console=ttyS0,115200
So I suppose I should manually load network driver, but how can I do
it from boot line and assign IP address to it ?
The answers, as very often with such simple questions, are in the kernel
documentation directory:
Add
"ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>"
to the kernel command line. See
http://lxr.linux.no/linux+v2.6.28.4/Documentation/filesystems/nfsroot.txt#L80
for the details
-------------------------------------------------------------------------------------------------------------------
The second attempt I took with a serial 8250 driver
I had build new kernel with Serial driver configured for remote
debugging and
changed boot line to :
kernel /boot/vmlinuz-2.6.13-kgdb ro root=/dev/hda1 kgdbwait
kgdb8250=1,115200
*Question1 : - docs says it must be kgdb8250=ttyS1,115200,
*
but when I tried this , the debug session even did not come to kgdb
breakpoint.
I'm guessing it needs to be ttyS0 and not 1.
gdbmod-2.4 ./vmlinux itle Linux-2.6.15.5-kgdb(eth)
GNU gdb 6.4
Copyright 2005 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details.
This GDB was configured as "i686-pc-linux-gnu"...Using host
libthread_db library "/lib/libthread_db.so.1".
(gdb) set remotebaud 115200
(gdb) target remote /dev/ttyS0
Remote debugging using /dev/ttyS0
breakpoint () at kernel/kgdb.c:1888
1888 atomic_set(&kgdb_setting_breakpoint, 0);
(gdb) cont
Continuing.
[17179569.184000] Waiting for connection from remote gdb...
[*17179569.184000] Invalid syntax for option kgdb8250=*
[New thread 1737]
Error while mapping shared library sections:
ide_disk.ko: Success.
Error while reading shared library symbols:
ide_disk.ko: No such file or directory.
Error while reading shared library symbols:
ide_disk.ko: No such file or directory.
[New thread 1774]
Error while reading shared library symbols:
ide_disk.ko: No such file or directory.
Error while reading shared library symbols:
ide_disk.ko: No such file or directory.
[New thread 1747]
Error while mapping shared library sections:
generic.ko: Success.
Error while reading shared library symbols:
ide_disk.ko: No such file or directory.
Error while reading shared library symbols:
generic.ko: No such file or directory.
Error while reading shared library symbols:
ide_disk.ko: No such file or directory.
Error while reading shared library symbols:
generic.ko: No such file or directory.
[New thread 1757]
Error while mapping shared library sections
Question 3 : Are those Succeses and Errors normal
No. I think you are missing the path to where the target kernel modules
are. It should something like
set solib-absolute-prefix /dev/null
set solib-search-path /path/to/kernel/modules
Question 4: How I can command to load my module from gdb line and set
a breakpoint to the function I would like to debug ?
Just load your modules on the target and then break in gdb and plant the
break point. you can also plant a break point before loading the module
(a defered break point) if you want to break in the module init function.\
Gilad
Regards to the kenel gurus.
Lev
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