Programming :: Compiling Kernel Module Using (/asm/system.h)
Apr 3, 2011
I`m trying to compile sources of kernel module which has been written for kernel 2.6.9. There were many changes in kernel headers since then in current kernel sources. I`ve found that old /asm/system.h was moved under architecture dedicated directory /arch/*/include/asm/system.h. Anyway during sources compilation I`m having errors related to kernel sources. It looks like there is something wrong with this /asm/system.h
Code:
../asm/system.h: In function �__cmpxchg�:
../asm/system.h:248: error: expected string literal before �LOCK_PREFIX�
../asm/system.h:254: error: expected string literal before �LOCK_PREFIX�
[code]....
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Jul 6, 2010
I have just started learning Device driver programming in Linux and am stuck in my first program. Its just to see init_module and cleanup_module calls to use printk and see results using dmesg. program is:
Code:
#define MODULE
#include<linux/module.h>
int init_module(void)
[code].....
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Aug 27, 2014
I'm trying to compile a Linux kernel module called hello-2.c using the command "make -C /lib/modules/$(uname -r)/build M=${PWD} modules" (without the quotes) (which I found online), and the following is the (seemingly successful) output.:
Code: Select allmake: Entering directory `/usr/src/linux-headers-3.2.0-4-amd64'
Building modules, stage 2.
MODPOST 0 modules
make: Leaving directory `/usr/src/linux-headers-3.2.0-4-amd64'
However, I don't see a hello-2.ko (in the same folder or anywhere else for that matter). I'm Using Debian GNU/Linux 7.6.
Everything I am doing is within a folder/directory called "thefolder" (without the quotes) in the "/tmp" directory (without the quotes).
Why I can't see a hello-2.ko, and what to do to get it?
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Apr 2, 2009
I want to test my system call that be goint to add to kernel, But when i finish compiling kernel, i found my system call code not work. the code i want to return the system time "struct timespec":
/*----------Start of mycall.c----------*/
#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/kernel.h>
[code]....
so i want a method to test the new system call before compiling kernel.
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Sep 25, 2015
I'm having problems to compile XIllybus kernel module. As this guide explains, [URL] ..... (on the top of page 8 of 25) I unpackaged the tar.gz file and compiled the kernel module by typing the make command in the proper path. When I compile the module with make command, I get the following error:
make -C /lib/modules/3.16.0-0.bpo.4-amd64/build SUBDIRS=/home/xillybus/module modules
make: *** /lib/modules/3.16.0-0.bpo.4-amd64/build: No such file or directory. Stop.
make: *** [default] Error 2
/lib/modules/3.16.0-0.bpo.4-amd64/build path does not exist. What does it mean? Should I have to install some kernel packet? www does not work for me.
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Mar 19, 2011
I'm trying to set it up so that I don't have to recompile the driver for my RAID card manually every time there is a kernel upgrade.I found a thread on it, here and a help page here, and it looks like it builds the module fine, but for some reason it's not being inserted into the new kernel, or something. It's like the new kernel doesn't know it exists, even tho modprobe -l shows the newly built module exists (and is in the correct place)Here's the script that I wrote up to get the drivers set up in DKMS:
Code:
#!/bin/bash
set -e
[code]....
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Mar 13, 2011
I update my last kernl to 2.6.38-rc7 but when I launch VirtualBox, on stdout.The vboxdrv kernel module is not loaded. Either there is no module available for the current kernel (2.6.38-rc7) or it failed to load. Please recompile the kernel module and install it by sudo /etc/init.d/vboxdrv setup.
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Jan 4, 2011
I am trying to figure out how to compile qcserial.c kernel module from the latest kernel source file located in the 2.6.37-rc8 kernel tree. I have installed the sources for my current kernel 2.6.35-24-generic on maverick and it seems that my includes are not in the right place to make the qcserial.c file happy.
I overcame this issue by passing the -I option to gcc that points to the directories that it is looking for. I am currently getting errors while compiling and I was wondering if it is impossible to compile qcserial.c on my current kernel? I am looking to get the diagnostic port and GPS port enabled for my built-in 3G card.
I havent built modules for quite some time and that was on opensuse with the fglrx module.
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Apr 20, 2011
Using the rpmbuild to compile the kernel, every time the patches will be applied to the source code. So even if no changes are made to the source code and no patches are added to kernel.spec, the whole kernel will still be recompiled, wasting a lot of time
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Jan 5, 2011
do you have any code to flash led lights with paralel port (device driver programming)or any lecture about this subject .if there is a working code this would be better ofcourse.
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Nov 14, 2013
I just finished building a cross-compiler for i386-elf. But when I try to use it, the terminal gives me this error:
Code: Select all/home/isaac/Cross-compiler/lib/gcc/i386-elf/4.8.2/../../../../i386-elf/bin/ld: cannot find crt0.o: No such file or directory
/home/isaac/Cross-compiler/lib/gcc/i386-elf/4.8.2/../../../../i386-elf/bin/ld: cannot find -lc
collect2: error: ld returned 1 exit status
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Dec 8, 2013
I'm trying to build the kernel module for dvbhdhomerun. The problem is the linux kernel headers provided by Debian do not have the dvb header files. Trying to set up my own kernel source tree to use is not working out so well.
I'm following the instructions in the Debian section here: [URL] ....
My first try compiled, but the modules ender up under /lib/modules/3.2.51/extra instead of /lib/modules/3.2.0-4-amd64/extra. Why?
I tried to start over, but noticed this while running apt-get source linux-image-3.2.0-4-amd64:
Code: Select allReading package lists... Done
Building dependency tree
Reading state information... Done
Picking 'linux' as source package instead of 'linux-image-3.2.0-4-amd64'
NOTICE: 'linux' packaging is maintained in the 'Svn' version control system at:
svn://svn.debian.org/svn/kernel/dists/trunk/linux/
[Code] ....
The failure to verify the signature has me concerned, but beyond that, what do I do about the different version number when compiling and installing the kernel modules?
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Jan 14, 2011
I am looking for information to insert kernel module into kernel. I am not looking at dynamically insert of kernel module using insmod, modprobe etc. I am looking for statically insertion of kernel module procedure, such as what to change on makefile, what to change on menuconfig, what to change on .config file, etc.
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Feb 22, 2011
There is a file called elevator.c. It is written as a module (i.e it has specific init and exit functions). However we are not able to see it in lsmod listing. We are working on a project where we need to modify this file. Compiling every time we change something will be time consuming. Is it possible to compile just this file and insert it as a normal module?
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May 28, 2010
I am trying to learn how to write a kernel module. I am following the excellent guide from The Linux Documentation Project called The Linux Kernel Module Programming Guide v.2.6.4.
My machine is running Ubuntu Lucid Lynx (10.04)
Code:
I installed the corresponding linux headers and just to make sure I also installed the linux source and extracted it in /usr/src
I am trying to run the following trivial kernel module
Code:
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Mar 2, 2011
I'm currently doing a tutorial for writing kernel modules. Right now I'm still at the very beginning, i.e. writing my helloworld stuff.
But what I like to do now is to write stuff onto the console, and I don't get it. According to my tutorials I can print stuff on the console using the printk()-function as long as the priority-level of the macro used in printk() is lower than the console_loglevel (how can I find that value out btw?).
But it doesn't work for me. Even if I use KERN_EMERG it still gets only logged, but not printed on the console and I thought KERN_EMERG get always printed...
Here's my code:
Code:
Code:
Everything works fine. But as soon as there are any blanks in mystring, e.g.
Code:
I always get
Code:
Why do I get this error and how can I insert string with blanks?
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Apr 27, 2010
There is a module A which is compiled with the kernel. I wrote an external module B which exported a symbol using EXPORT_SYMBOL.The module A now needs to talk with that exported symbol (function call). For that i modified A so that it includes the function call from B. However i now get unidentified symbol errors during 'make' operation as symbols of B are not present during kernel compile and A now kind of depends on B.
One solution is that make B part of the kernel as well. However, it would mean that whenever now i try to compile a kernel with a different source, i have to modify the config files and everything to accommodate B.Hence i am seeking a solution which does not include modifying the kernel.
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Apr 13, 2011
I'm trying to debug a module I programmed but I don't want to do it on the running host but against UML (don't want to reboot every 5 minutes).
The UML kernel I downloaded is 2.6.38.2. I have already downloaded the ubuntu kernel headers for this version (they belong to natty though I'm running maverick.... when I installed the .deb file with dpkg I had no problem at all).
Now I'd like to build said module against these headers. How can I do it?
Here's the makefile for my module code...
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Apr 16, 2010
I need a module that flash Caps-Lock led. Is it possible to use outb() function here for sending data to keyboard via port 0x64 ?
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Jun 10, 2010
How can we fire a shell command like ls,./a.out automatically in kernel space via a kernel module ? i.e. replacement of system() function of user space into kernel space.We need to develop a kernel module which can fire some shell command let say "firefox [url]" automatically to open google automatically from module.
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May 14, 2010
I'm currently working with wireless network kernel module.
This device initialiy gets its IP address by using DHCP,
but the problem is sometimes the new IP assigned for internal reason.
So what I want to do is assigning new(changed)IP address into exsiting
interface, or occuring DHCP renew event to cause update IP from kernel
level. This shold be done without user's intervention, so whenever the
kernel module detects IP changed(via underlying wireless
communication), it automatically correct update its IP address.
Q1) any functions or api to cause DHCP renew event from kernel level?
Q2) or any functions or api to assign IP address to specific interface?
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Sep 16, 2010
i'm using this guide videos - howto: debian linux kernel compilation, part 1 and the author says i need kernel 2.6.26 this version of kernel doesnt longer exist in kernel.org website and the only 2.6.26 i found is a patch here. should i use the patch? or download another version of kernel?
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May 1, 2010
This for Kernel 2.6.29.6. I'm trying to code a kernel module that displays process information.
how to count opened file descriptors per task. I have been able to write a module that lists all the current process names along with their pid number in /var/log/messages. Basically, I cycle through the ring of processes using the macro for_each_process(task) and printk the comm and pid of each task. I'm trying to see how many file descriptors each task has open. I've been reading up in books and all over the internet. At first I thought I needed to access max_fds under files_struct, but that just lists the maximum number of file descriptors that can be opened per task, which by default is set at 256. I then thought about counting the elements in the fd_array. But then I learned that every task's fd_array is initially set at 32. Now I know that I need to access open_fds of type fd_set * in files_struct. open_fds is a pointer to all the open file descriptors. The problem is that I don't know how to access a pointer of type fd_set.
Is there a good guide or book that really focuses on type fd_set and open_fds? Every book and resource I've read never really go into depth on this. relationship between files struct, open_fds, and the open file descriptors in task?
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Apr 22, 2010
I want to add some code in existing linux2.6.33.2 to enhance kernelI want to know how to start and where to add code.
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Jan 30, 2011
I need to install module u32 into the netfilter module for kernel 2.6.27.
I did not see the source code in the kernel version I have. where can I find the code for U32 module.
I have checked "netfilter.org" and looks like POM is discontinued. Is the u32 module committed to kernel version 2.6.27 or need to patch it. If yes, where can I find the patch?
I building the kernel for a MIPS processor.
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Sep 27, 2010
Actually, I have posted this problem here but I don�t know if is best to ask it here. The problem is that I have upgraded my OS to Slackware 13.1 64 bits, and now, I can�t compile the module RT73 from serialmonkey
There are a lot of similar tutorials explaining the steps for a succesfully installation. I had followed any of them before, and I had no problem never.
But now, I get this error:
Code:
make[1]:Entering directory "/usr/src/linux-2.6.33.4"
Building modules, stage 2
MODPOST 0 modules
make [1]: Leaving directory "/usr/src/linux-2.6.33.4"
rt73.ko failed to build!
make:*** [module] Error 1
On the other hand, in the serialmonkey page they said that the driver was included into the kernel yet, but I don�t know how can I now if I have the driver installed. The true is that my usb doesn�t work.
It�s is a USB D-Link System AirPlus G DWL-G122 Wireless Adapter (rec.C1) [Ralink RT73]
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May 24, 2011
A friend is running Ubuntu 10.04 on a laptop that uses the Ralink RT5390 chip for wifi which requires compiling and adding a module. My plan is to...
1. download on my 10.04 laptop whatever .dpkg packages are needed to compile a new module,
2. meet at a location that has a good wifi (just in case),
3. connect the two laptops with a cross-over Ethernet cable,
4. download and install the compiling tools + module source on her laptop, I need to know three things:
1. Which Ubuntu packages must I download to be able to compile a new module? Is "build-essential" enough?
2. Where can I find those packages as .dpkg, so I can install from those offline files instead of fetching them from the Net?
3. To get an Ethernet connection going between the two laptops, do I need to do anything extra on her laptop besides assigning it an IP manually that is in the same range as my laptop?
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May 24, 2011
A friend is running Ubuntu 10.04 on a laptop that uses the Ralink RT5390 chip for wifi which requires compiling and adding a module. My plan is to...
1. download on my 10.04 laptop whatever .dpkg packages are needed to compile a new module,
2. meet at a location that has a good wifi (just in case),
3. connect the two laptops with a cross-over Ethernet cable,
4. download and install the compiling tools + module source on her laptop, and
5. cross my fingers.
So I need to know three things:
1. Which Ubuntu packages must I download to be able to compile a new module? Is "build-essential" enough?
2. Where can I find those packages as .dpkg, so I can install from those offline files instead of fetching them from the Net?
3. To get an Ethernet connection going between the two laptops, do I need to do anything extra on her laptop besides assigning it an IP manually that is in the same range as my laptop?
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Nov 2, 2010
I've never compiled/built/installed any Apache module before, and I just can't seem to get it working on ArchLinux. I got the source code from here: [URL] Then I tried doing this...
Code:
apxs -c -L/usr/lib/mysql -I/usr/include/mysql -lmysqlclient -lm -lz mod_auth_mysql.c
And I get this...
Quote:
/usr/share/apr-1/build/libtool --silent --mode=compile gcc -prefer-pic -march=x86-64 -mtune=generic -O2 -pipe -DLINU X=2 -D_REENTRANT -D_GNU_SOURCE -pthread -I/usr/include/httpd -I/usr/include/apr-1 -I/usr/include/apr-1 -I/usr/incl ude -I/usr/include/mysql -c -o mod_auth_mysql.lo mod_auth_mysql.c && touch mod_auth_mysql.slo mod_auth_mysql.c:591:2: error: expected expression before
[code]...
I would eventually like to modify the mod_auth_mysql.c source code so I can append a salt/padding to the end of the hashes (that mod_auth_mysql reads from the database), but I will be happy if I can just install the damn thing.
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Apr 6, 2010
I wrote a character device driver for an Embedded Linux build (Kernel Revision 2.6.17.1) running on ARM9. In the module's "read()" function, I'm returning the number of bytes that were copied into the user buffer. I saw some module code samples online and in most cases the "read()" function is returning the number of bytes read.The very strange behavior I saw in my case was, if I use a variable to return the value from the module's "read()" function, the user application reading from the module always saw "0".For instance:
Code:
static int zlg7289_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
[code]....
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