x86_64 module loader reloc problem

From: Jason Baietto <jason.baietto@ccur.com>
To: lkml <linux-kernel@vger.kernel.org>
Subject: x86_64 module loader reloc problem
Date: Wed, 29 Oct 2003 14:18:22 -0500	[thread overview]
Message-ID: <1067455102.444.18.camel@broccoli> (raw)

Using test8 I'm only able to load kernel modules on x86_64 systems if I
comment out the overflow check for R_X86_64_32 relocation entries in
arch/x64_64/kernel/module.c.

With the check in place I get errors like this:

   overflow in relocation type 10 val ffffff0000426b88" errors
   `test' likely not compiled with -mcmodel=kernel
   insmod: error inserting 'test.ko': -1 Invalid module format

Yes, I'm using -mcmodel=kernel.  I'm also using module-init-tools
0.9.15-pre2.  Once loaded, the modules appear to be working properly,
but it wouldn't surprise me if a time bomb was lurking there.

What am I doing wrong?  Compiler used for both kernel and modules is gcc
(GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-20).

Note that in my linked test module, objdump shows 632 R_X86_64_32 reloc
entries and only 18 R_X86_64_64 reloc entries.

Take care,
Jason