Re: [microblaze-uclinux] Kernel module driver crash

[David Wong <davidikwong@xxxxxxxxx>]

Hi Ian, Giulio and Wendy,

I would very much like to keep up with the issue you are working on. I ran your code (rename your code to test.c) on ML506 board but seeing:

---------------------------------------------
# insmod ./test.ko
Using ./test.ko
insmod: Not configured to support old kernels
---------------------------------------------

Do you know what's going on here? Looks like that I am not at your pace yet. Any insight would be greatly appreciated. Let me know if I can be of any help.

David

--- On Wed, 4/22/09, Whitmore Ian J <IJWHITMORE@xxxxxxxxxxx> wrote:

> From: Whitmore Ian J <IJWHITMORE@xxxxxxxxxxx>
> Subject: [microblaze-uclinux] Kernel module driver crash
> To: microblaze-uclinux@xxxxxxxxxxxxxx
> Date: Wednesday, April 22, 2009, 2:11 AM
> 
> 
> 
>  
>  
> 
> 
> 
> 
> 
> 
>  
> 
> 
> 
> Hi
> all, 
> 
> 
>   
> 
> I am writing a
> module driver and have run into a problem and
> just wanted to check I’m not doing anything
> stupid! 
> 
> 
>   
> 
> I am not
> currently using the latest SVN version I am using
> an export from the 25/2/09 – I am in the process of
> updating to the
> latest version. 
> 
> 
>   
> 
> I have made an
> example which on my system causes an illegal
> instruction Oops: 
> 
> 
>   
> 
> ---------------------------------------
> 
> 
> #include
> <linux/kernel.h> 
> 
> #include
> <linux/init.h> 
> 
> #include
> <linux/module.h> 
> 
> 
>   
> 
> MODULE_AUTHOR("Ian
> Whitmore"); 
> 
> MODULE_DESCRIPTION("Discovery
> communications
> example"); 
> 
> MODULE_LICENSE("Dual
> BSD/GPL"); 
> 
> 
>   
> 
> static void
> test1(void); 
> 
> static void
> test2(void); 
> 
> 
>   
> 
> static int
> __init startGoing(void) 
> 
> {
> 
> 
>   
> printk("I'm in
> startGoing\n"); 
> 
>   
> test1(); 
> 
>   
> test1(); 
> 
>   
> return 0; 
> 
> }
> 
> 
> 
>   
> 
> static void
> __exit stopGoing(void) 
> 
> {
> 
> 
>   
> printk("I'm in
> stopGoing\n"); 
> 
>   
> test1(); 
> 
>   
> test1(); 
> 
>   
> return; 
> 
> }
> 
> 
> 
>   
> 
> 
>   
> 
> static void
> test1(void) 
> 
> {
> 
> 
>   
> printk("I'm in
> test1\n"); 
> 
>   
> test2(); 
> 
>   
> test2();          
> //If
> this call is commented out the module does not crash!
>  
> 
>   
> return; 
> 
> }
> 
> 
> 
>   
> 
> static void
> test2(void) 
> 
> {
> 
> 
>   
> printk("I'm in
> test2\n"); 
> 
>   
> return; 
> 
> }
> 
> 
> 
>   
> 
> module_init(startGoing);
> 
> 
> 
> 
> module_exit(stopGoing);
> 
> 
> 
> 
> 
>   
> 
> This is the
> error message I get: 
> 
> 
> 
> 
>   
> 
> 
> 
> # insmod
> discovery-module.ko 
> 
> I'm in
> startGoing 
> 
> Oops: Exception
> in kernel mode, sig: 4 
> 
>  Registers
> dump: mode=8816FEC0 
> 
>  r1=88038130,
> r2=8809408C, r3=00000015, r4=FFFFFFFF 
> 
>  r5=881605A4,
> r6=00000001, r7=FFFFFFFF, r8=00000000 
> 
>  r9=23410000,
> r10=00000049, r11=00000000, r12=84000000 
> 
>  r13=8F023B10,
> r14=88096654, r15=8F5881B0, r16=881788F8 
> 
>  r17=881787DC,
> r18=00000000, r19=8802651C, r20=881788E0 
> 
>  r21=00000001,
> r22=881788F8, r23=00000001, r24=00000004 
> 
>  r25=00000001,
> r26=88004598, r27=8818172C, r28=8813F808 
> 
>  r29=88178904,
> r30=00000000, r31=00000000, rPC=88175968 
> 
>  msr=00000000,
> ear=00000000, esr=880020B4, fsr=00000A33 
> 
> Illegal
> instruction 
> 
> ---------------------------------------
> 
> 
> 
>   
> 
> 
>   
> 
> If I comment out
> the 2nd call to test2()  the
> module does not crash: 
> 
> ---------------------------------------
> 
> 
> # insmod
> discovery-module.ko 
> 
> I'm in
> startGoing 
> 
> I'm in
> test1 
> 
> I'm in
> test2 
> 
> I'm in
> test1 
> 
> 
> 
> I'm in
> test2 
> 
> #
> 
> 
> 
> 
> 
>   
> 
> Has anyone got
> any ideas? 
> 
> 
>   
> 
> Ian.
> 
> 
> 
>   
> 
> PS. sorry about
> the footer to this email – It’s
> a work address and I can’t get rid of
> it!!! 
> 
> 
> 
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