From: fche@redhat.com (Frank Ch. Eigler)
To: Zheng Da <zhengda1936@gmail.com>
Cc: William Cohen <wcohen@redhat.com>,
"Turgis, Frederic" <f-turgis@ti.com>,
"systemtap@sourceware.org" <systemtap@sourceware.org>
Subject: Re: error to run systemtap in an ARM platform
Date: Sun, 24 Jul 2011 01:57:00 -0000 [thread overview]
Message-ID: <y0msjpwv3t8.fsf@fche.csb> (raw)
In-Reply-To: <CAFLer82o_0zj9OEsG8oSeE42LLZJHbM6YWoFfEGeT2EfdLPDZA@mail.gmail.com> (Zheng Da's message of "Sat, 23 Jul 2011 15:55:57 -0700")
Zheng Da <zhengda1936@gmail.com> writes:
> 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 believe this message is derived from elfutils, a library used within
systemtap. (See dwflpp.cxx:literal_stmt_for_return calling into
dwfl_module_return_value_location and follow from there.) elfutils
tells us where to find return values of functions in the ABI of each
architecture, as a function of types.
> 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?
It looks in the ELF and/or separated-DWARF files for the kernel:
basically the vmlinux and/or vmlinux.debug files. It does not need
the ordinary object files that were linked together to go into
vmlinux. (Kernel modules - .ko files - are different.)
> Any ideas how to debug the problem?
In this case, I might try focusing the debugger on the function
arm_return_value_location(), probably in elfutils' libebl_arm.so.
- FChE
next prev parent reply other threads:[~2011-07-24 1:57 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-15 0:58 Da Zheng
2011-07-15 9:43 ` Mark Wielaard
2011-07-15 20:00 ` Da Zheng
2011-07-15 20:15 ` Frank Ch. Eigler
[not found] ` <4E20A714.9020404@gmail.com>
2011-07-15 20:50 ` Frank Ch. Eigler
2011-07-15 20:46 ` William Cohen
2011-07-15 21:29 ` Da Zheng
2011-07-16 0:23 ` Turgis, Frederic
2011-07-18 14:13 ` William Cohen
2011-07-18 19:02 ` Da Zheng
2011-07-18 20:10 ` William Cohen
2011-07-18 20:18 ` William Cohen
2011-07-18 20:41 ` Da Zheng
2011-07-23 22:56 ` Zheng Da
2011-07-24 1:57 ` Frank Ch. Eigler [this message]
2011-07-24 16:10 ` Frank Ch. Eigler
2011-07-25 10:04 ` Mark Wielaard
2011-07-25 19:34 ` Da Zheng
2011-07-25 15:46 ` William Cohen
2011-07-25 19:36 ` Da Zheng
2011-07-25 20:46 ` Mark Wielaard
2011-07-25 17:17 ` William Cohen
2011-07-25 19:56 ` Da Zheng
2011-07-26 14:03 ` William Cohen
2011-07-26 17:47 ` Da Zheng
2011-07-19 11:38 ` Turgis, Frederic
2011-07-18 14:00 ` William Cohen
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