Re: 32-bit binaries (was: Re: Star Office)
Okay thanks for the info. I'm unfortunately not a programmer (yet), and therfor only understand about half of this. If
there is someone out there that knows about this, I would love to make this happen, but need your help. So if you don't
mind helping a non-programmer, I would be glade to at least try and do this.
Thanks,
Ron
P.S. Sorry to leave the whole message below, but it is relevant to my request.
David Daniel (ddd@null.net) wrote:
> Christopher C Chimelis <chris@beezer.med.miami.edu> writes:
>
> > On 15 Sep 1999, Ron Farrer wrote:
> >
> > > There was a hack posted on the Rat Hat axp-list for ld? to fool it
> > > into making a 32-bit binary. I know the place in the > archive that
> > > it is located if you want me to post it. Does anyone know if this
> > > would work?
> >
> > I have it and it should work, but it probably could bear to be reposted
> > here in case others want to know. I have the linker script saved without
> > the message, so if you can dig up the original message and repost, it
> > would help :-)
> >
>
> Here's a compendium of the relevant messages (haven't tried it myself)...
> --
> David Daniel <ddd@null.net>
>
>
> Richard Henderson <rth@twiddle.net> writes:
>
> >Greg Lindahl <lindahl@cs.virginia.edu> writes:
> >
> > >Ivan Kokshaysky <ink@jurassic.park.msu.ru> writes:
> > >
> > > > Greg Lindahl <lindahl@cs.virginia.edu> writes:
> > > >
> > > > > What we really need is the -taso flag added to GNU ld. This flag links
> > > > > a process so that it runs in a 32-bit address space (e.g. it places
> > > > > everything so that the upper 32 bits of all addresses is zero). Minor
> > > > > kernel changes are also needed. That would allow Netscape and a
> > > > > variety of other broken programs to be easily compiled in AlphaLinux.
> > > >
> > > > Actually, it's possible right now. Create linker script with
> > > > `ld --verbose', edit it like this
> > > > - . = 0x120000000 + SIZEOF_HEADERS;
> > > > + . = 0x10000 + SIZEOF_HEADERS;
> > > > and link with it. Then you have to set 1 (EF_ALPHA_32BIT)
> > > > at file offset 0x30 (Elf64_Ehdr.e_flags) in the executable.
> > > > Any 2.2.x kernel supports this flag.
> > >
> > > OK, so you need to:
> > >
> > > ld --verbose > script
> > > delete up to the "============" and the one at the end
> > > make the above change
> > > ld -T script -static
> > > flip the bit at 0x30
> > >
> >
> > You don't have to make it static if you don't want.
> >
> > This bit [at 0x30] means you won't get anything mapped at addresses
> > above 0x7fffffff without explicitly requesting it (via mmap
> > MAP_FIXED).
> >
> > The upshot of this is that the shared libraries and the brk arena
> > wind up in the low 31 bits, which means you can cast pointers
> > through int and back without damage.
>
Reply to: