linux-kernel - Re: [PATCH] Translate asm version of ELFNOTE macro into preprocessor macro

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Message-ID: <44EC72F3.70505@goop.org>
Date:	Wed, 23 Aug 2006 08:23:31 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ian Campbell <Ian.Campbell@...Source.com>
CC:	Andrew Morton <akpm@...l.org>,
	Virtualization <virtualization@...ts.osdl.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] Translate asm version of ELFNOTE macro into	preprocessor
 macro

Ian Campbell wrote:
>> OK, seems reasonable.  Eric Biederman solved this by having NOTE/ENDNOTE 
>> (or something like that) in his "bzImage with ELF header" patch, but I 
>> don't remember it being used in any way which is incompatible with using 
>> a CPP macro.
>>     
>
> I can't find that patch, does NOTE/ENDNOTE just do the push/pop .note
> section?
>
> That would solve the problem with the first argument of the macro being
> a string but the final argument could still be for .asciz note contents.
>   

It looks like:

.macro note name, type
      .balign 4
      .int    2f - 1f            # n_namesz
      .int    4f - 3f            # n_descsz
      .int    \type            # n_type
      .balign 4
1:    .asciz "\name"
2:    .balign 4
3:
.endm
.macro enote
4:    .balign 4
.endm


so it allows you to put arbitrary stuff in the desc part of the note.  
The downside is that its a little more cumbersome syntactically for the 
common case.

    J
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