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How to use older libs in 32bit mode?
- Subject: How to use older libs in 32bit mode?
- From: amd64 at wayne47.com (Michael R. Wayne)
- Date: Fri Nov 26 10:48:52 2004
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)
> sysctl kern.elf32
> * 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
> 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
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?