linux-kernel - Re: [powerpc] ftrace warning kernel/trace/ftrace.c:2068 with code-patching selftests

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Date:   Thu, 27 Jan 2022 07:46:01 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Sven Schnelle <svens@...ux.ibm.com>,
        Yinan Liu <yinan@...ux.alibaba.com>,
        linuxppc-dev@...ts.ozlabs.org, Sachin Sant <sachinp@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, ardb@...nel.org,
        keescook@...omium.org
Subject: Re: [powerpc] ftrace warning kernel/trace/ftrace.c:2068 with
 code-patching selftests

On Thu, 27 Jan 2022 12:27:04 +0000
Mark Rutland <mark.rutland@....com> wrote:

> Ah, so those non-ELF relocations for the mcount_loc table just mean "apply the
> KASLR offset here", which is equivalent for all entries.
> 
> That makes sense, thanks!

And this is why we were having such a hard time understanding each other ;-)

I started a new project called "shelf", which is a shell interface to
read ELF files (Shelf on a ELF!).

It uses my ccli library:

   https://github.com/rostedt/libccli

and can be found here:

   https://github.com/rostedt/shelf

Build and install the latest libccli and then build this with just
"make".

  $ shelf vmlinux

and then you can see what is stored in the mcount location:

  shelf> dump symbol __start_mcount_loc - __stop_mcount_loc

I plan on adding more to include the REL and RELA sections and show how
they affect symbols and such.

Feel free to contribute too ;-)

-- Steve