Re: thoughts on architectures

[utsl@quic.net]

On Mon, Feb 11, 2002 at 04:41:07AM +0100, Marcus Brinkmann wrote:
> On Mon, Feb 11, 2002 at 02:35:50PM +1100, matthew green wrote:
> >    
> >    > Also, FreeBSD (and possibly NetBSD as well) uses the ELF OSABI field to mark
> >    > it's binaries.
> >    
> >    The GNU/Hurd does it as well.
> > 
> > 
> > hmm, last i looked hurd used an ELF note, like NetBSD.
> 
> Yes, sorry, I thought that was he meant (and he did :).  I did not even know
> about a special OSABI field.
> 
> ulysses:/tmp/x# objdump -s -j .note.ABI-tag /bin/bash
> 
> /bin/bash:     file format elf32-i386
> 
> Contents of section .note.ABI-tag:
>  8048108 04000000 10000000 01000000 474e5500  ............GNU.
>  8048118 00000000 02000000 00000000 1e000000  ................
> ulysses:/tmp/x# objdump -s -j .note.ABI-tag /gnu/bin/bash
> 
> /gnu/bin/bash:     file format elf32-i386
> 
> Contents of section .note.ABI-tag:
>  8048100 04000000 10000000 01000000 474e5500  ............GNU.
>  8048110 01000000 00000000 00000000 00000000  ................

There's a field in the ELF header called OS/ABI. Readelf -h finds it, and it
looks like this:

Normal binaries:
  OS/ABI:                            UNIX - System V

FreeBSD binaries:
  OS/ABI:                            UNIX - FreeBSD

I need to look into it a bit more, and figure out exactly what FreeBSD does
and doesn't do with this.