Re: error to run systemtap in an ARM platform

[Da Zheng <zhengda1936@gmail.com>]

On 07/26/11 07:03, William Cohen wrote:
> On 07/25/2011 03:55 PM, Da Zheng wrote:
>> On 07/25/11 10:16, William Cohen wrote:
>>> On 07/23/2011 06:55 PM, Zheng Da wrote:
>>>> Hello,
>>>>
>>>> I'm still trying to fix the problem.
>>>> semantic error: failed to retrieve return value location for vfs_write
>>>> (/build/tegra2_seaboard/tmp/portage/sys-kernel/chromeos-kernel-9999/work/chromeos-kernel-9999/fs/read_write.c):
>>>> identifier '$return' at read-write.stp:7:6
>>>>           source:     if ($return>   0) {
>>>>                           ^
>>>> I'm pretty sure CONFIG_DEBUG_INFO is enabled, and in
>>>> /build/tegra2_seaboard/tmp/portage/sys-kernel/chromeos-kernel-9999/work/chromeos-kernel-9999/build/tegra2_seaboard,
>>>> a binary file vmlinux is 57MB. It should contain the debug information.
>>>>
>>>> (cr) zhengda@zdpc
>>>> /build/tegra2_seaboard/tmp/portage/sys-kernel/chromeos-kernel-9999/work/chromeos-k
>>>> ernel-9999/build/tegra2_seaboard $ ls -l vmlinux
>>>> -rwxr-xr-x 1 zhengda portage 59419805 Jul 22 20:55 vmlinux
>>>>
>>>> How does systemtap use the debug information? When it compiles the
>>>> script, does it need to read the debug information from the kernel
>>>> image? or it needs to read the .obj files of the kernel?
>>>> Any ideas how to debug the problem?
>>>>
>>>> Thanks,
>>>> Da
>>> I wonder if this might be Bug 440059 - Missing return value locations support for ARM in elfutils backend
>>>
>>> https://bugzilla.redhat.com/show_bug.cgi?id=440059
>>>
>>> How old is the version of elfutils you are using?
>> Problem is solved. I used a latest version of elfutils, and systemtap can compile the script now.
>>
>> Thanks,
>> Da
> Hi Da,
>
> Glad to hear that it is working with the newer elfutils. Which particular distribution of linux for arm are you using?
It's ChromeOS.
> Are you planning on probing modules with systemtap? We have noticed that probing modules does not currently work on arm. There is a bug entry for it: http://sourceware.org/bugzilla/show_bug.cgi?id=13022
Thanks for letting me know. I guess I won't probing modules.

Thanks,
Da