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

From: Eric W. Biederman
Date: Wed Aug 23 2006 - 13:09:11 EST

Jeremy Fitzhardinge <jeremy@xxxxxxxx> writes:

> 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.

I don't expect it to be much more cumbersome, as two pieces, and you need the extra
alignment at the end to ensure each not entry is 4 byte aligned. Being able to
push and pop a section wouldn't hurt either.


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