Date: Fri, 23 Feb 2001 14:33:16 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Marcel Moolenaar <marcel@cup.hp.com> Cc: arch@FreeBSD.org Subject: Re: sysctl kern.fallback_elf_brand Message-ID: <XFMail.010223143316.jhb@FreeBSD.org> In-Reply-To: <3A96AC92.F14A90B9@cup.hp.com>
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On 23-Feb-01 Marcel Moolenaar wrote:
> David O'Brien wrote:
>>
>> The real fix is to teach the ELF image loader to read the .note.ABI-tag
>> section. Then statically linked Linux binaries would be correctly
>> identified [since our branding scheme isn't accepted by anyone other than
>> us].
>
> The use of the section seems broken to me. It's the first time I've
> heard of it (so I won't really know how it's used :-). AFAICT, ABI
> information is written in e_ident[EI_OSABI] and annotated with flags in
> e_flags. That should be enough for our ELF loader.
I talked with O`Brien about this today. Many other people view this field as
being used when you _extend_ the ELF specification itself. Not as a mechanism
for running a plain ELF binary and marking which set of system calls, etc. it
assumes. The other method is apparently already used by Linux, BSD/OS,
{Net,Open}BSD, etc. I.e., by the rest of the world.
--
John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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