To: linux-kernel@vger.kernel.org
From: Ben Pfaff <blp@cs.stanford.edu>
Subject: Re: Easier way to generate stuff like asm-offsets.
Date: Fri, 20 Nov 2009 20:43:16 -0800
Message-ID: <87aaygfpy3.fsf@blp.benpfaff.org>
References: <3f43f78b0911201656o6d222e6fkf5ef8533c8ee6e16@mail.gmail.com>
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Kaz Kylheku <kkylheku@gmail.com> writes:

> Then we can use the ``nm'' tool (the toolchain should have binutils in it):
>
> $ /path/to/toolchain/bin/arch-prefix-nm -t d -P foo.c   # decimal
> output, posix format
> offsetof_foo_member C 00000044 00000044

If those numbers are in decimal...

> There we go, 44 bytes.  Simple.  This is almost an #include file;
> we just have to do some simple filtering, such as:
>
> $ /path/to/toolchain/bin/arch-prefix-nm -t d -P test.o | awk '{ print
> "#define", $1, $4 }'
> #define offsetof_foo_member 00000044

...then the #define is wrong because it's interpreted as octal
there.

Cool trick!
-- 
Ben Pfaff 
http://benpfaff.org

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