Re: [Xen-devel] Xen domU module debugging using GDBSX

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Mon, 21 Apr 2014 11:29:40 +0900
êìê <kllaf28@xxxxxxxxx> wrote:

> Hi.
> 
> I've tried to use the GDBSX for debugging a domU module, but there is
> a problem loading module symbols.
> 
> I'm using
> xen : 4.2
> dom0 : fedora core 14 (linux kernel 2.6.32.57)
> domU : ubuntu 10.04 (linux kernel 2.6.37.1)
> 
> This is what I've done
> 1. I created a PV domU.
> 2. On dom0 command line, I wrote "gdbsx -a 1 64 9999"
> 3. Using gdb, I connected to the gdbsx from dom0
> dom0 > gdb vmlinux
> gdb > target remote localhost:9999
> 
> 4. In the domU, insmod mymodule.ko
> 
> 5. On dom0 gdb, I added mymodule.ko using add-symbol-file command with
> text, bss, data, rodata address found in the directory
> /sys/module/mymodule/sections
> 
> After these steps, I could break 'some' functions like
> cleanup_module(). And I think it works well. But some functions are
> not working and most of all, i can't see the codes. How can I add
> remote directories dynamically using GDBSX?

Could the functions be inlined? Have you tried adding "noinline" to
function declaration? I assume you are referring to functions in the
kernel and not loaded modules.

Mukesh



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