How to use older libs in 32bit mode?

[Peter Wemm]

On Friday 26 November 2004 10:46 am, Michael R. Wayne wrote:
> On Thu, Nov 25, 2004 at 12:42:33PM -0800, Peter Wemm wrote:
> > Things to check:
> >
> > * Make sure you have COMPAT_IA32 in your kernel config.  For
> > example, this command should work:
> >
> > peter at overcee[8:16pm]~/fbp4/hammer/sys/amd64/conf-120> sysctl
> > kern.elf32 kern.elf32.fallback_brand: -1
> > (The important thing is that it prints something, not the value)
>
> Yes:
>    > sysctl kern.elf32
>
>    kern.elf32.fallback_brand: -1
>
> > * Make sure you have NOT copied ld-elf or libc from an i386 system.
> > You *MUST* build at least these two on your machine.  How to check:
> >
> > peter at overcee[8:17pm]~-123> strings /libexec/ld-elf32.so.1 | grep
> > libmap32 /etc/libmap32.conf
> > If this comes up empty, you're in trouble.  Check that
> > /usr/libexec/ld-elf32.so.1 and /libexec/ld-elf.so.1 are the same
> > file.
>
> So far OK:
>    > strings /libexec/ld-elf32.so.1 | grep libmap32
>
>    /etc/libmap32.conf
> and
>    lrwxr-xr-x  1 root  wheel      22 Nov 15 17:13
> /usr/libexec/ld-elf32.so.1@ -> /libexec/ld-elf32.so.1
>
> > These will not be present on a 5.3-release system.
>
> Running 5.3-RELEASE so they are not present, as expected.
>
> > Oh wait a second.  Did you build your libraries with
> > WITH_LIB32=yes or by running build32.sh ?  I have a suspicion
> > that build32.sh will produce a bad library now.
>
> Aha.  Yes, I built with build32.sh as it was the only way I found to
> do it.  If this is not correct, perhaps someone could put up a
> quick "how-to" page and post a URL?
>
> It would also be useful to understand how to build a port for i386,
> google was not helpful in determining how to do this.
>
> > BTW: it is helpful to do a ktrace/kdump and show the last few
> > lines. I suspect there will be a sysarch syscall, followed by a
> > SIGSEGV.
>
> You are correct:
>    72509 hello    CALL  sysarch(0x1,0xffffd70c)
>    72509 hello    RET   sysarch -1 errno 22 Invalid argument
>    72509 hello    PSIG  SIGSEGV SIG_DFL
>    72509 hello    NAMI  "hello.core"
>
> So, it looks like build32.sh is broken on 5.3-RELEASE.  What now?

Oh no!  It means that FreeBSD/i386 binaries unconditionally use TLS 
(thread-local-storage) setup calls in early startup.  That means we are 
hosed until a bunch of TLS support routines are merged from 6.0 to 
5.3-stable.

Unfortunately, there is nothing that you can do for now.  :-(
-- 
Peter Wemm - peter at wemm.org; peter at FreeBSD.org; peter at yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5