linux-kernel - Re: Easier way to generate stuff like asm-offsets.

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Date:	Fri, 20 Nov 2009 20:43:16 -0800
From:	Ben Pfaff <blp@...stanford.edu>
To:	linux-kernel@...r.kernel.org
Subject:  Re: Easier way to generate stuff like asm-offsets.

Kaz Kylheku <kkylheku@...il.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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