Re: make command on target gives segmentation fault

["Subramani Venkatesh" <subbu31mani@xxxxxxxxx>]

Hello Russel,
Thank you very much for the response. I am sorry for incomplete details.
Here are details of my board and the changes what I did for my port.

I am working on ARMv4 Compatible processor, FA526, ARM922 compatible.
I have 16KB Instruction and Datacache, 2 way Assoctivity
4 ways Unified TLBS
Linux kernel  linux-2.6.16.11

Changes were made in
1. linux/arch/arm/mm/copypage-v4wb.S
in function copyuser-page and clearuser-page,
instead of clean and invalidating single entry for cache, I gave completely
clean and Invalidating cache as shown below
mcr p15, 0, ip, c7, c14, 0
. when I tried giving single entry I get segmentation fault often when I run
any commands on shell.

2. linux/arch/arm/mm/proc-x.S (Here I used proc-arm922 as my refernce)
i. in function flush_user_cache_all
I couldn't do single entry clean and invalidating the cache,  I have to
again go for complete cache cleaning and invalidating, where I have to
replace the entire loop to
mcr p15, 0, ip, c7, c14, 0

ii. similarly in function
cpu_x_switch_mm
I had to replace the the loop of clean and invalidating the single entry I
had to replace the whole cache as shown above.

After doing above changes I was able to get console and shell prompt,
even applications
does runs which are compliled on the host, but when I tried compiling on
target I get segmentation fault.

Also am I need to do any changes to the functions given below related
to clean and invalidating cache?
arm922_coherent_kern_range,

Now let me try the CONFIG_DEBUG_USER, and let you know the details for sure.

Regards
Subbu

On 6/24/06, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> wrote:
> On Sat, Jun 24, 2006 at 02:13:32PM +0530, Subramani Venkatesh wrote:
> > Previously I mailed to the group with respect to cache problem, that is
> > switching my kernel to usr application program "/sbin/init" to get login
> > prompt , now after modifing cache related application in
> > linux/arch/arm/mm/*.S I am able to run /sbin/init and login prompt too,
> now
> > I am currently facing a problem related to segmentaion fault when I run
> some
> > of the applications like make command and other few in lmbench.
> > Can some one suggest me where could be the problem.
>
> Your message is soo vague that it's impossible to make any suggestions.
> There's no information on the CPU you're using, no information on the
> modifications, no information on what media you're using for userspace,
> etc.
>
> Also, check whether you get kernel output when your applications SEGV,
> and if you do, post that output as well.  If not, enable CONFIG_DEBUG_USER
> and pass 'user_debug=31' to the kernel and reproduce.

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