[Qemu-discuss] Debugging linux modules with gdb under qemu

[sdrb]

Hello everyone,

I need to debug Linux modules for ARM architecture.
I've compiled Yocto Linux distribution and run it under qemu.
Qemu is run with "-s" option so I can connect with gdb to qemu.

Here is what I'm trying to do:
Under Yocto Linux I'm loading bonding module:

# insmod bonding.ko

Then I run gdb and type following commands:

file vmlinux
target remote 0:1234
add-symbol-file bonding.ko 0xbf000000 -s .bss 0xbf016420 -s .data 
0xbf015e58 -s .gnu.linkonce.this_module 0xbf016240


From gdb I'm trying to access some area of memory:

(gdb) p modules
$24 = {next = 0xbf016244, prev = 0xbf016244}
(gdb) x/x 0xbf016244
0xbf016244: Cannot access memory at address 0xbf016244

but I got error that this memory address is not accessible.

My question is - why I got this error? Is that mean that the memory 
region 0xbf016244 is not readable?

How can I make it accessible? By changing Linux kernel somehow or is it 
possible from the gdb or qemu point of view?