kernel modules

[John Rushford]

Greetings,

I'm trying to learn something about loadable device drivers in
FreeBSD. I've built the following tutorial example on my AMD64 laptop
running FreeBSD 8.0-RC3 and a GENERIC kernel. When I try to load this
example, I get the following error:

# kldload ./hello_fsm.ko
kldload: can't load hello_fsm.ko: Exec format error

And in /var/log/messages:
Nov 22 14:03:53 jjr-laptop kernel: KLD hello_fsm.ko: depends on kernel
- not available or version mismatch
Nov 22 14:03:53 jjr-laptop kernel: linker_load_file: Unsupported file
type

The tutorial built fine, here is the source and makefile. What have I
missed?

Makefile:

# Declare Name of kernel module
KMOD = hello_fsm

# Enumerate Source files for kernel module
SRCS = hello_fsm.c

# Include kernel module makefile
.include <bsd.kmod.mk>

hello_fsm.c:

#include <sys/param.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/systm.h>

/* The function called at load/unload. */
static int event_handler(struct module *module, int event, void *arg)
{
int e = 0; /* Error, 0 for normal return status */
switch (event) {
case MOD_LOAD:
uprintf("Hello Free Software Magazine Readers! \n");
break;
case MOD_UNLOAD:
uprintf("Bye Bye FSM reader, be sure to check
http://freesoftwaremagazine.com !\n");
break;
default:
e = EOPNOTSUPP; /* Error, Operation Not Supported */
break;
}

return(e);
}

/* The second argument of DECLARE_MODULE. */
static moduledata_t hello_conf = {
"hello_fsm", /* module name */
event_handler, /* event handler */
NULL /* extra data */
};

DECLARE_MODULE(hello_fsm, hello_conf, SI_SUB_DRIVERS,
SI_ORDER_MIDDLE);

[Patrick Lamaizière]

John Rushford :

> And in /var/log/messages:
> Nov 22 14:03:53 jjr-laptop kernel: KLD hello_fsm.ko: depends on kernel
> - not available or version mismatch
> Nov 22 14:03:53 jjr-laptop kernel: linker_load_file: Unsupported file
> type
>
> The tutorial built fine, here is the source and makefile. What have I
> missed?

That works fine here. I think you've built the module with sources not
in sync with your kernel.

[John Rushford]

On Nov 23, 5:38 am, Patrick Lamaizière <adre...@est.invalid> wrote:
> John Rushford :
>
> > And in /var/log/messages:
> > Nov 22 14:03:53 jjr-laptop kernel: KLD hello_fsm.ko: depends on kernel
> > - not available or version mismatch
> > Nov 22 14:03:53 jjr-laptop kernel: linker_load_file: Unsupported file
> > type
>
> > The tutorial built fine, here is the source and makefile.  What have I

> > missed?t

>
> That works fine here. I think you've built the module with sources not
> in sync with your kernel.

Patrick, you were correct. Thanks very much

John