Develop Reference

Error in loading android kernel module (No symbol version for module_layout)

I am trying to load a kernel module for android.
First, I've download the kernel source code from the target device which MotoG5 from here: https://github.com/MotorolaMobilityLLC/kernel-msm. Also, I've added these files which contain f2fs for compilng the kernel (available here https://github.com/MotorolaMobilityLLC/motorola-kernel) . I was able to compile the kernel using the following commands :
export CROSS_COMPILE=/media/hero/HDD1/android-ndk-r15c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
export ARCH=arm
make clean && make mrproper
make msm8937-perf_defconfig
make -j4
make modules // to generate Module.symvers which can be used later to compile a kernel module.
Then, I wrote small kernel code as follow :
#include "linux/module.h"
#include "linux/kernel.h"
//replace the "" with angular brackets
int init_module(void)
{
printk(KERN_INFO "Hello android kernel...\n");
return 0;
}
void cleanup_module(void)
{
printk(KERN_INFO "Goodbye android kernel...\n");
}
android_module.c
obj-m += android_module.o
KDIR := /media/hero/HDD1/k3/kmsm/
PWD := $(shell pwd)
ARCH=arm
CROSS_COMPILE=/media/hero/HDD1/android-ndk-r15c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
all:
make -C $(KDIR) ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) M=$(PWD) modules
clean:
$(MAKE) -C $(KDIR) M=$(PWD) clean
Makefile
After that, I was able to compile the kernel successfully with no warning at all. here are some info about the vermagic and file command output for the generated kernel module.
root#root:/hello3# modinfo android_module.ko
filename: /media/hero/HDD1/hello3/android_module.ko
depends:
vermagic: 3.18.31-perf SMP preempt mod_unload modversions ARMv7 p2v8
root#root:/hello3# file android_module.ko
android_module.ko: ELF 32-bit LSB relocatable, ARM, EABI5 version 1 (SYSV), BuildID[sha1]=a9bcb514badd8f5799151e0ee4993fd73302175c, with debug_info, not stripped
I compare these info to an existing kernel module in the phone and they match exactly. this is a sample for existing loadable kernel.
modinfo *******.ko
filename: *******.ko
license: GPL
description: Input driver event debug module
author: Vojtech Pavlik <vojtech#ucw.cz>
alias: input:b*v*p*e*-e*k*r*a*m*l*s*f*w*
depends:
intree: Y
vermagic: 3.18.31-perf SMP preempt mod_unload modversions ARMv7 p2v8
file *******.ko
evbug.ko: ELF 32-bit LSB relocatable, ARM, EABI5 version 1 (SYSV), BuildID[sha1]=b14c49bf595842f41a31b9a5d0e66bc8523703a8, with debug_info, not stripped
Now. The problem is whenever I load the module I got this message
insmod: failed to load android_module.ko: Exec format error
Also, dmesg show the following :
android_module: no symbol version for module_layout
Please note that some answers online said that I should generate Module.symvers before compiling a kernel module so I did that and I did not encounter any error regarding missing Module.symvers while compiling the kernel module.
Any idea, why this module cannot be load ? please let me know.
Regards,

How to test android Goldfish Kernel 3.10 on Versatilepb Suported QEMU?

I'm trying to port Android on VersatilePB using [Android Goldfish 3.10 kernel](https://android.googlesource.com/kernel/goldfish/+/android-goldfish-3.10).
First, I configured kernel for versatile_defconfig and I successfully built it. I got .config file, renamed it as versatile_config and added Android base configuration to that using the following command
ARCH=arm scripts/kconfig/merge_config.sh versatile_config android/configs/android-base.cfg
Again, I built the kernel successfully. After that, I built the Android Google source code and I have taken ramdisk.img from google_src_v4.4/out/target/product/generic. After that, I tested using following command,
qemu-system-arm -M versatilepb -kernel ./arch/arm/boot/zImage -initrd ramdisk.img -append "console=ttyAMA0 root=/dev/ram0 rw" -serial stdio
but I'm getting the following error. Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
CPU: 0 PID: 1 Comm: init Not tainted 3.10.0 #15
[<c001271c>] (unwind_backtrace+0x0/0xe8) from [<c001129c>] (show_stack+0x10/0x14)
[<c001129c>] (show_stack+0x10/0x14) from [<c0368304>] (panic+0x8c/0x1d4)
[<c0368304>] (panic+0x8c/0x1d4) from [<c001fe94>] (do_exit+0x7f8/0x8d8)
[<c001fe94>] (do_exit+0x7f8/0x8d8) from [<c001ffe0>] (do_group_exit+0x40/0xd4)
[<c001ffe0>] (do_group_exit+0x40/0xd4) from [<c002a75c>] (get_signal_to_deliver+0x178/0x5c4)
[<c002a75c>] (get_signal_to_deliver+0x178/0x5c4) from [<c00109a4>] (do_signal+0xd0/0x434)
[<c00109a4>] (do_signal+0xd0/0x434) from [<c0010ea4>] (do_work_pending+0xa8/0xb8)
[] (do_work_pending+0xa8/0xb8) from [] (work_pending+0xc/0x20)

Somehow related to the "init()" function, where kernel is trying to create the very first process (in userspace) for the first time - this is also where LInux and Android differs. So did you use the QEMU from Android?:
https://github.com/android/platform_external_qemu
And see the discussion here:
https://balau82.wordpress.com/2010/03/22/compiling-linux-kernel-for-qemu-arm-emulator/
there are some hints here:
Run Android app in qemu-arm?
And here has commandline for emulation:
How to compile android goldfish 3.4 kernel and run on emulator

Building kernel module for Android

I need to add the FTDI USB module to the Android kernel (Android 2.3.1, Linux 2.6.32), so I got the 2.6.32 kernel and tried to build the module:
make modules ARCH=arm CROSS_COMPILE=arm-none-eabi-
But when I tried to do 'insmod ftdi_sio.ko', the error message was
insmod: init_module 'ftdi_sio.ko' failed (Exec format error)
In dmesg's output I found this
ftdi_sio: version magic '2.6.32.27 preempt mod_unload ARMv5 ' should be '2.6.32.27 preempt mod_unload ARMv7 '
I tried to add 'armv7-a' flag (as I read in Android NDK docs)
make modules ARCH=arm CROSS_COMPILE=arm-linux-androideabi- CFLAGS='-march=armv7-a -mfloat-abi=softfp'
Also, I tried following cross-compilers: arm-none-eabi-, arm-eabi-, arm-linux-android-eabi-
Every time result was the same - ARMv5 in the version magic.
How can I build the module for ARMv7?

Try setting up CONFIG_CPU_V7=y in your kernel .config file

Loading kernel module in Android kernel

I am listing my problem here.
I have a Google Nexus one a.k.a. "passion" phone with me. Fastboot and adb tools are installed in the phone. And the boot loader is unlocked.
My task: I have to add a linux kernel module to the Android kernel.
What I have done:
I followed the steps in http://source.android.com/source/initializing.html and downloaded the kernel for android-2.3.6_r1 (passion) and have built it. I am also able to flash it on the phone and the new android kernel also works fine. Now what I want is to modify the kernel and add my own kernel module and then flash it on the phone, so that the kernel on the phone is my modified kernel.
Now I have come across two approaches to do this.
1)
Cross Compile my kernel module with the android kernel and push it on the device with adb command. The Makefile I use in the kernel is as follows.
VERSION = 2
PATCHLEVEL = 3
SUBLEVEL = 6
EXTRAVERSION = -00054-g5f01537
obj-m += hello-1.o
KDIR=/home/apurva/android_dir
PWD := $(shell pwd)
all:
make -C $(KDIR) ARCH=arm CROSS_COMPILE=/home/apurva/android_dir/prebuilt/linux- x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi- SUBDIRS=$(PWD) modules
clean:
make -C $(KDIR) ARCH=arm CROSS_COMPILE=/home/apurva/android_dir/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi- SUBDIRS=$(PWD) clean
Now this is not able to generate new hello-1.ko. I do not know why, I guess there is some problem with the VERSION, PATCHLEVEL, SUBLEVEL and EXTRAVERSION values. Are these necessary? I tried these value from android-2.3.6_r1 also but still it does not work. I am not sure what is this EXTRAVERSION value?
I even tried with the hello-1.ko generated from the compiler in my ubuntu. I pushed this hello-1.ko into the emulator with the following adb command.
/root/bin/src/out/host/linux-x86/bin/adb shell mount
/root/bin/src/out/host/linux-x86/bin/adb push hello-1.ko /data
/root/bin/src/out/host/linux-x86/bin/adb insmod /data/hello-1.ko
But that hello-1.ko is not able to insmod and I get the following error.
insmod : Error in init_module() hello-1.ko function not implemented
Whereas the hello-1.c is quite simple:
#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_INFO */
int init_module(void)
{
printk(KERN_INFO "Hello world 1.\n");
return 0;
}
void cleanup_module(void)
{
printk(KERN_INFO "Goodbye world 1.\n");
}
2)
The second approach of doing this can be placing my source files of the kernel module in the kernel directory of android. May be in the system directory or somewhere else and ask the make to build these source files also along with the other source. But I am not sure where to ask the make process to do so. I tried to do so in main.mk and created a Android.mk file in the source directory of my source files but it did not work. May be this is a better solution but I could not find any help on this.
After doing this, my kernel modules should be able to control the wnic (Wireless Network Interface device) of the android phone. It should be able to put the wnic in sleep mode and then wake it up after receiving command from my kernel module. If you have some pointers on how to do this, that will be a help. I have found that on Android it is controlled through wpa_supplicant private driver. Commands, like:
wpa_cli driver powermode 0 - auto
wpa_cli driver powermode 1 - active
can do my task, but I am not sure since I have not tried. I have not reached that stage.
Please look into this and provide some help/guidance.
Thanks,
Apurva

Kernel modules (KO's) are much easier to work with than a static kernel - as long as the kernel has enabled them. The easiest way to tell is do an "adb shell lsmod". Second is to see if the kernel .config has enabled CONFIG_MODULES=y and CONFIG_MODULE_UNLOAD=y. Lots of info on the web about linux KO development.
Hummm, you're close but it looks like the makefile is screwy. First try to build the hello KO on your host for unit test, then build on your target. Here's a sample makefile I use on an OMAP36xx running gingerbread:
# Makefile for trivial android kernel module
obj-m += mod_hello.o
CROSS_COMPILE=/opt/distros/ARM/bin/arm-none-linux-gnueabi-
TARG_KDIR ?= /opt/android/dal/nook_kernel
HOST_KDIR=/lib/modules/$(shell uname -r)/build
# target creates:
# .<obj>.o: CC command line for the .o, including dependencies
# .<obj>.mod.o.cmd: CC command line for the mod.o, including dependencies
# .<obj>.ko.cmd: LD command line which links the .o and .mod.o to create the .ko
target:
#echo "Make module for target arm"
make -C $(TARG_KDIR) M=$(PWD) ARCH=arm CROSS_COMPILE=$(CROSS_COMPILE) modules
host:
#echo "Make module for host"
make -C $(HOST_KDIR) M=$(PWD) modules
clean:
#echo "cleaning target"
make -C $(TARG_KDIR) M=$(PWD) clean
#echo "cleaning host"
make -C $(HOST_KDIR) M=$(PWD) clean

First check in the .config if the module support is enabled. (CONFIG_MODULES=y and CONFIG_MODULE_UNLOAD=y) if not enable them using menuconfig.
Then place your module on the root of the kernel source and add this to the main makefile you find at the root
core-y := usr/ yourModule/
and this to the yourModule folders makefile
obj-m := yourModule.o

How do you create a loadable kernel module for Android?

I know there a number of walkthroughs and tutorials floating around out there which describe this activity, but after having read many of them I still can't get this working. If anyone has the patience to wade through the steps I've taken (posted below) and suggest where I may have gone off track I'd be very appreciative. I've spent about a day and a half staring at make files and reading walkthroughs so literally any suggestions would be helpful.
Environment:
I'm using an Ubuntu 10.04 32 bit vm.
I'm hosting from a 64 bit windows 7
My Core 2 Duo does not have the hardware support for 64 bit VMs so i'm trying to compile against Android 2.1 kernel
I have installed Java 1.5 from the Dapper repo and removed my 1.6 installation
The rest of the tooling has been acquired according the Android dev documentation...
As per Initializing a Build Environment:
Java:
$ sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu dapper main multiverse"
$ sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu dapper-updates main multiverse"
$ sudo apt-get update
$ sudo apt-get install sun-java5-jdk
Other required:
$ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev libc6-dev libncurses5-dev x11proto-core-dev libx11-dev libreadline5-dev libz-dev libgl1-mesa-dev
$ sudo apt-get install gcc-multilib g++-multilib libc6-i386 libc6-dev-i386
Then from Downloading the Source Tree:
Repo:
$ mkdir ~/bin
$ PATH=~/bin:$PATH
$ curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
$ chmod a+x ~/bin/repo
$ mkdir WORKING_DIRECTORY
$ cd WORKING_DIRECTORY
$ repo init -u https://android.googlesource.com/platform/manifest -b eclair
$ repo sync
$ gpg --import (imported the huge key)
And from Building the System:
Initialize:
$ source build/envsetup.sh
Choose a Target:
$ lunch generic-user
Build the Code:
$ make -j4
Added!
Output of make -j4:
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.1-update1
TARGET_PRODUCT=generic
TARGET_BUILD_VARIANT=eng
TARGET_SIMULATOR=
TARGET_BUILD_TYPE=release
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=ECLAIR
============================================
build/core/copy_headers.mk:15: warning: overriding commands for target `out/target/product/generic/obj/include/libpv/getactualaacconfig.h'
build/core/copy_headers.mk:15: warning: ignoring old commands for target `out/target/product/generic/obj/include/libpv/getactualaacconfig.h'
/bin/bash: line 0: cd: sdk/layoutopt/app/src/resources: No such file or directory
Install: out/host/linux-x86/bin/acp
target Generated: libclearsilver-jni <= out/host/common/obj/JAVA_LIBRARIES/clearsilver_intermediates/javalib.jar
target Generated: libclearsilver-jni <= out/host/common/obj/JAVA_LIBRARIES/clearsilver_intermediates/javalib.jar
host SharedLib: libneo_cs (out/host/linux-x86/obj/lib/libneo_cs.so)
host C++: aapt <= frameworks/base/tools/aapt/AaptAssets.cpp
host C++: aapt <= frameworks/base/tools/aapt/Command.cpp
error: error reading out/host/common/obj/JAVA_LIBRARIES/clearsilver_intermediates/javalib.jar; error in opening zip file
error: error reading out/host/common/obj/JAVA_LIBRARIES/clearsilver_intermediates/javalib.jar; error in opening zip file
error: error reading out/host/common/obj/JAVA_LIBRARIES/clearsilver_intermediates/javalib.jar; cannot read zip file
error: cannot access org.clearsilver.HDF
class file for org.clearsilver.HDF not found
javadoc: error - Class org.clearsilver.HDF not found.
Error: No classes were specified on the command line. Try -help.
make: *** [out/host/linux-x86/obj/SHARED_LIBRARIES/libclearsilver-jni_intermediates/org_clearsilver_HDF.h] Error 15
make: *** Waiting for unfinished jobs....
error: error reading out/host/common/obj/JAVA_LIBRARIES/clearsilver_intermediates/javalib.jar; cannot read zip file
error: cannot access org.clearsilver.CS
class file for org.clearsilver.CS not found
In file included from frameworks/base/tools/aapt/AaptAssets.h:18,
from frameworks/base/tools/aapt/AaptAssets.cpp:5:
frameworks/base/tools/aapt/ZipFile.h:65: warning: ‘typedef’ was ignored in this declaration
javadoc: error - Class org.clearsilver.CS not found.
Error: No classes were specified on the command line. Try -help.
In file included from frameworks/base/tools/aapt/AaptAssets.h:18,
from frameworks/base/tools/aapt/Main.h:14,
from frameworks/base/tools/aapt/Command.cpp:6:
frameworks/base/tools/aapt/ZipFile.h:65: warning: ‘typedef’ was ignored in this declaration
make: *** [out/host/linux-x86/obj/SHARED_LIBRARIES/libclearsilver-jni_intermediates/org_clearsilver_CS.h] Error 15
Added!
So it turns out i've got some problems here. I assume that once i've overcome these issues, i'll have an environment capable of compiling kernel modules. Please do correct me if I'm wrong.
Next I head into my directory containing my module.c file and it's makefile. Contents of makefile below:
obj-m += mymodule.o
CROSS_COMPILE=~/WORKING_DIRECTORY/prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/bin/arm-eabi-
KERNEL_DIR ?= /home/<myuser>/WORKING_DIRECTORY
VERSION = v1.1
all:
make -C $(KERNEL_DIR) M=$(PWD) ARCH=arm CROSS_COMPILE=$(CROSS_COMPILE) modules
rm -rf *.c~
rm -rf *.mod*
rm -rf *.o
clean:
make -C $(KERNEL_DIR) M=$(PWD) clean
I have very little experience with make and makefiles, but this looked reasonable to me. My main concern with this file is the KERNEL-DIR variable. I tried a few different values for that variable, but got all sorts of errors where I do not with it's current value. Of course, it could still be wrong, so any comments here are welcome.
So, as far as I know, I should be able to execute make with no args or anything and will figure out what it needs to do. I have tried make, make -f both with and without sudo. All four permutations yield the same results:
make -C /home/<myuser>/WORKING_DIRECTORY M=/home/<myuser>/Desktop/<MyModuleDir> ARCH=arm CROSS_COMPILE=~/WORKING_DIRECTORY/prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/bin/arm-eabi- modules
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.1-update1
TARGET_PRODUCT=generic
TARGET_BUILD_VARIANT=eng
TARGET_SIMULATOR=
TARGET_BUILD_TYPE=release
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=ECLAIR
============================================
make[1]: Entering directory `/home/<myuser>/WORKING_DIRECTORY'
build/core/copy_headers.mk:15: warning: overriding commands for target `out/target/product/generic/obj/include/libpv/getactualaacconfig.h'
build/core/copy_headers.mk:15: warning: ignoring old commands for target `out/target/product/generic/obj/include/libpv/getactualaacconfig.h'
/bin/bash: line 0: cd: sdk/layoutopt/app/src/resources: No such file or directory
Available sub-modules:
01-test dumpsys libminui LotsOfApps
20-dns.conf dvz libminzip lowstoragetest
95-configured dx libmp4recognizer_utility lsd
aapt dx-tests libmtdutils LunarLander
acc edify libnativehelper LunarLanderTests
AccountAndSyncSettings Email libneo_cgi MagicSmokeWallpapers
accRuntimeTest EmailTests libneo_cs make_cfst
acp emma libneo_util makedict
adb emmalib libnetutils make_g2g
adbd emulator libocr makekeycodes
add-property-tag emulator-arm libomx_aac_component_lib make_ve_grammar
afar emulator-hw libomx_aacdec_sharedlibrary mediaframeworktest
aidl emulator-tcg libomx_amr_component_lib MediaProvider
AlarmClock EnabledTestApp libomx_amrdec_sharedlibrary mediaserver
AliasActivity etc1tool libomx_amrenc_component_lib memtest
am eventanalyzer libomx_amrenc_sharedlibrary minigzip
android event-log-tags libomx_avc_component_lib mkbootfs
android.core.tests.annotation exc_dump libomx_avcdec_sharedlibrary mkbootimg
android.core.tests.archive ext libomx_baseclass_lib mksdcard
android.core.tests.concurrent Fallback libomx_common_lib mkstubs
android.core.tests.crypto fastboot libomx_m4v_component_lib mkyaffs2image
android.core.tests.dom FixedGridLayout libomx_m4vdec_sharedlibrary Mms
android.core.tests.logging flash_image libomx_mastercore_lib MmsTests
android.core.tests.luni.io FontLab libomx_mp3_component_lib monkey
android.core.tests.luni.lang framework libomx_mp3dec_sharedlibrary monkeyrunner
android.core.tests.luni.net FrameworkPermissionTests libomx_queue_lib mtpd
android.core.tests.luni.util framework-res libomx_sharedlibrary MultiResolution
android.core.tests.math FrameworkTest libop Music
android.core.tests.nio framework-tests libopencore_author MusicTests
android.core.tests.nio_char FrameworkTestTests libopencore_common nc
android.core.tests.prefs fsck_msdos libopencore_download netcfg
android.core.tests.regex fs_config libopencore_downloadreg netperf
android.core.tests.runner fs_get_stats libopencore_mp4local netserver
android.core.tests.security Gallery libopencore_mp4localreg ninepatch
android.core.tests.sql Gallery3D libopencore_net_support NinePatchLab
android.core.tests.text GalleryTests libopencore_player NoShareUidApp
android.core.tests.xml gdbserver libopencore_rtsp NotePad
android.core.tests.xnet genext2fs libopencore_rtspreg NotePadTests
android.cts.dpi GestureBuilder libosclbase opcontrol
android.cts.refapp GL2JNI libosclerror openssl
android.policy GLJNI libosclio OpenWnn
android.policy_mid GlobalSearch liboscllib oprofiled
android.policy_phone GlobalSearchBenchmarks libosclmemory org.eclipse.core.commands_3.4.0.I20080509-2000
androidprefs GlobalSearchPermissionTests libosclproc org.eclipse.equinox.common_3.4.0.v20080421-2006
android.test.runner GlobalSearchTests libosclregcli org.eclipse.jface_3.4.2.M20090107-0800
AndroidTests GlobalTime libosclregserv org-netbeans-api-visual
angeles GoogleContactsProvider libosclutil org-openide-util
ant GoogleContactsProviderTests libpagemap osgi
antlr-2.7.7 google-framework libpassthru_oma1 PackageInstaller
anttasks googlelogin-client libpcap parseStringTest
apicheck GoogleSearch libpixelflinger perm_checker
ApiDemos gpustate libpixelflinger_armv6 perm_checker.conf
ApiDemosReferenceTest gralloc.default libpixelflinger_static Phone
ApiDemosTests groovy-all-1.6.5 libplatform_library_jni PicoTts
apkbuilder grxmlcompile libpng ping
ApplicationsProvider gtest-filepath_test libpopt PinyinIME
applypatch gtest-linked_ptr_test libprotocolenginenode_base PlatformLibraryClient
applypatch_static gtest-message_test libprotocolenginenode_common platform.xml
app_process gtest-options_test libprotocolenginenode_download_common pm
AppWidgetHostTest gtest-port_test libprotocolenginenode_pdl post_trace
AppWidgetProvider gtest_pred_impl_unittest libprotocolenginenode_ps pppd
apriori gtest_prod_test libpv_aac_dec preload
archquery gtest-test-part_test libpvaacffparsernode ProcessTests
asm-3.1 gtest-typed-test2_test libpvaacffrecognizer procmem
atree gtest-typed-test_test libpvaacparser procrank
AudioHardwareRecord gtest_unittest libpvamrffparsernode profile_pid
AudioHardwareRecordLoop gzip libpvamrffrecognizer profile_trace
AudioInRecord HelloActivity libpv_amr_nb_common_lib Provision
backup_helper_test HelloActivityTests libpvamrwbdecoder pvplayer
BackupTest hierarchyviewer libpvauthorengine q2dm
BatteryWaster hist_trace libpv_avc_common_lib q2g
bb2sym Home libpvavcdecoder qemud
bb_dump hosttestlib libpvavifileparser qemu-props
bbprof hprof-conv libpv_config_parser qwerty2.kcm
bison HTMLViewer libpvdecoder_gsmamr qwerty.kcm
Bluetooth icache libpvdownloadinterface racoon
BluetoothChat icudata libpvdownloadmanagernode radiooptions
BluetoothDebug idegen libpvdownloadreginterface read_addr
bmgr ime libpvencoder_gsmamr read_method
bookmarks.xml ImfTest libpvfileoutputnode read_pid
bootanimation ImfTestTests libpvfileparserutils read_trace
Browser imgdiff libpvframemetadatautility recovery
BrowserPowerTests init libpvgendatastruct required_hardware.xml
BrowserTestPlugin input libpvgsmamrparser rgb2565
BrowserTests installd libpv_http_parcom rild
bsdiff invoke_mock_media_player libpvid3parcom rsg-generator
bspatch iptables libpvjitterbuffer RSSReader
btool ip-up-vpn libpvjitterbuffernode run-core-tests
bugreport iself libpvjitterbufferrtp run-core-tests-on-ri
BusinessCard isprelinked libpvlatmpayloadparser safe_iop_test
Calculator jarjar libpvmediadatastruct SampleBrowserPlugin
CalculatorTests jarutils libpvmediainputnode schedtest
Calendar jasmin libpvmedialayernode scp
CalendarProvider jasmin.jar libpvmediaoutputnode screenshot2
CalendarProviderTests javax.obex libpvmf sdklib
CalendarTests jcommon-1.0.12 libpvmfrecognizer sdkmanager
Camera jdiff libpvmimeutils SdkSetup
CameraTests jdwpspy libpvmioaviwavfileinput sdkstats
CertInstaller JETBoy libpvmiofileinput sdkuilib
cfassembler jfreechart-1.0.9 libpvmiofileoutput sdutil
check-lost+found jfreechart-1.0.9-swt libpvmp3 SearchableDictionary
check_prereq junit libpvmp3ff sensors.goldfish
check_stack jython libpvmp3ffparsernode service
check_trace kcm libpvmp3ffrecognizer servicemanager
clearsilver keystore libpvmp4decoder services
cmu2nuance keystore_cli libpvmp4ff Settings
com.android.inputmethod.pinyin.lib KeyStoreTests libpvmp4ffcomposer SettingsProvider
com.example.android.platform_library kxml2-2.3.0 libpvmp4ffcomposernode SettingsTests
commons-compress-1.0 latencytop libpvmp4ffparsernode sh
Compass LatinIME libpvmp4ffrecognizer ShareUidApp
ContactManager Launcher libpvmp4interface showlease
Contacts Launcher2 libpvmp4reginterface showmap
ContactsProvider launchperf libpvomxaudiodecnode showslab
ContactsProviderTests layoutlib libpvomxbasedecnode sig
ContactsTests layoutlib_api libpvomxencnode sig-check
core layoutlib_create libpv_omx_interface sig-create
core-tests layoutlib_utils libpvomx_proxy_lib signapk
CoreTests layoutopt libpvomxvideodecnode SignatureTest
coverage libabi libpvplayer_engine SignatureTestTests
cpueater libacc libpvpvxparser signature-tools
cpufeatures libaes libpvrtsp_cli_eng_node SimpleJNI
crasher libandroidpv libpvrtspinterface SkeletonApp
create_test_dmtrace libandroidpvauthor libpv_rtsp_parcom SkeletonAppTests
cts libandroid_runtime libpvrtspreginterface skia_bench
CtsAccessibilityServiceTestCases libandroid_servers libpvsdpparser skia_gm
CtsAccountManagerTestCases libapplypatch libpvsocketnode SlowSuggestions
CtsAppAccessData libarity libpvstreamingmanagernode SmokeTest
CtsAppSecurityTests libastl libpvthreadmessaging SmokeTestApp
CtsAppTestCases libaudioflinger libpvwav Snake
CtsAppWithData libaudiointerface libpvwavffparsernode SnakeTests
CtsBluetoothTestCases libaudiopolicygeneric libpvwavffrecognizer SoftKeyboard
CtsContentTestCases libbinder librank soslim
cts-dalvik-buildutil libbz libreference-cdma-sms sound
CtsDatabaseTestCases libc libreference-ril SoundRecorder
CtsDelegatingAccessibilityService libcameraservice libril SpammySuggestions
CtsDpiTestCases libcamerastub libRS SpareParts
CtsDpiTestCases2 libc_common librs_jni spec-progress
CtsExampleTestCases libc_debug librtppayloadparser sqlite3
CtsGestureTestCases libclearsilver-jni librtprtcp SRecTest
CtsGraphicsTestCases libc_nomalloc libsafe_iop SRecTestAudio
CtsHardwareTestCases libcolorconvert libsampleplugin ssh
CtsInstrumentationAppDiffCert libcpm libSDL SslLoad
CtsJniTestCases libcrypto libSDLmain stack_dump
CtsLocationTestCases libctest libsimplejni StatusBarTest
CtsMediaTestCases libcts_jni libskia Stk
CtsNetTestCases libctspermission_jni libskiagl strace
CtsOsTestCases libcutils libsonivox stringtemplate
CtsPerformance2TestCases libdb libsoundpool su
CtsPerformance3TestCases libdbus libspeex surfaceflinger
CtsPerformance4TestCases libdbus-tools-common libsqlite svc
CtsPerformance5TestCases libdex libsqlite3_android swing-worker-1.1
CtsPerformanceTestCases libdl libsqlite3_phone_number_utils_test swt
CtsPermission2TestCases libdrm1 libsqlite3_phonetic_string_utils_test system_server
CtsPermissionDeclareApp libdrm1_jni libSR_AcousticModels tcpdump
CtsPermissionTestCases libdrm2 libSR_AcousticState TelephonyProvider
CtsProviderTestCases libdvm libSR_AudioIn telephonytest
CtsSharedUidInstall libebl libSR_Core temp_layoutlib
CtsSharedUidInstallDiffCert libebl_arm libsrec_jni Term
CtsSimpleAppInstall libedify libSR_EventLog test_defs.xml
CtsSimpleAppInstallDiffCert libEGL libSR_G2P TestDeviceSetup
CtsSpeechTestCases libelf libSR_Grammar test-fb-refresh
CtsTargetInstrumentationApp libelfcopy libSR_Nametag test-fb-simple
CtsTelephonyTestCases libembunit libSR_Recognizer test_g2g
CtsTestStubs libemoji libSR_Semproc test-mdp
CtsTextTestCases libESR_Portable libSR_Session test-opengl-codegen
CtsUsePermissionDiffCert libESR_Shared libSR_Vocabulary test-opengl-fillrate
CtsUtilTestCases libETC1 libssl test-opengl-filter
CtsViewTestCases libexif libstagefright test-opengl-finish
CtsWebkitTestCases libexpat libstagefright_omx test-opengl-gl2_basic
CtsWidgetTestCases libext libstdc++ test-opengl-gl_basic
CubeLiveWallpapers libfdlibm libsurfaceflinger test-opengl-gralloc
CustomLocale libFFTEm libsvoxpico test-opengl-linetex
daemonize libfst libsystem_server test-opengl-swapinterval
dalvikvm libft2 libsysutils test-opengl-textures
dasm libgetactualaacconfig libterm test-opengl-tritex
dbus-daemon libgif libtestplugin test-progress
dbus-monitor libgl2jni libthread_db test-progress-new
dbus-send libGLES_android libthreadsafe_callback_ao test_swiarb
ddmlib libGLESv1_CM libtinyxml test_zipfile
ddms libGLESv2 libtomcrypt timeinfo
ddmuilib libgljni libtommath timetest
debuggerd libgoogleclient libttspico toolbox
DensityTest libgtest libttssynthproxy traceview
descGen libgtest_main libui TransformTest
DeskClock libhardware libunz TtsService
Development libhardware_legacy libutil tuttle2.kcm
dexdeps libhost libutils uix
dexdump libicudata-default libvorbisidec updater
dexlist libicudata-eu libwbxml UpgradeExample
dexopt libicudata-jp libwbxml_jni usbtest
dexopt-wrapper libicudata-large libwebcore UserDictionaryProvider
dexpreopt libicudata-us libwnndict VisualizationWallpapers
dex-tools libicui18n libWnnEngDic vm-tests
dhcpcd libicuuc libWnnJpnDic VoiceDialer
dhcpcd-run-hooks libiptc libwpa_client Voiper
dictTest libjavacore libxml2 vold
DisabledTestApp libjni_latinime libxml2wbxml VpnServices
dmtracedump libjni_pinyinime libz wbxmltest
DownloadProvider libjnitest libzipfile wdsclient
draw9patch libjpeg LightingTest webkitmerge
DrmProvider liblog line_endings Wiktionary
droiddoc libm linker WiktionarySimple
dumpeventlog libm4v_config LiveWallpapers xmlwriter
dumpkey libmedia LiveWallpapersPicker yuv420sp2rgb
dump_regions libmedia_jni localize zipalign
DumpRenderTree libmediaplayerservice logcat
dumpstate libmincrypt logwrapper
make[1]: Leaving directory `/home/<myuser>/WORKING_DIRECTORY'
rm -rf *.c~
rm -rf *.mod*
rm -rf *.o
You'll notice a few screwy warnings, but as best as I can tell, they are not real problems. If anyone feels differently about these, please say so.
make[1]: Entering directory `/home/<myuser>/WORKING_DIRECTORY'
build/core/copy_headers.mk:15: warning: overriding commands for target `out/target/product/generic/obj/include/libpv/getactualaacconfig.h'
build/core/copy_headers.mk:15: warning: ignoring old commands for target `out/target/product/generic/obj/include/libpv/getactualaacconfig.h'
/bin/bash: line 0: cd: sdk/layoutopt/app/src/resources: No such file or directory
I guess that last line sounds pretty suspicious but I have no idea what to do about it. Apart from the few strange things i've mentioned, it would appear that this all went smoothly. However, after the whole thing completes, I can't find the *.ko file anywere. I did a ls -alRg | grep *.ko on my home directory and it turns up nothing. I'm stumped. If I can provide any more information or run any tests or try anything differently i'll be checking in frequently.

Sorry for being late, but hope it helps:
http://tthtlc.wordpress.com/2011/12/29/how-to-write-a-kernel-module-on-android-sony-ericsson-xperia-arc-s/
I wrote and tested the code on my Sony Ericsson Xperia Arc S and it works (in general in should work for any Android phone).
Connecting via adb and USB, and “su” to root, the “lsmod” listed all the kernel module (in general, the article at
http://web.archive.org/web/20121106004141/http://developer.sonymobile.com/2011/05/06/how-to-build-a-linux-kernel gave a very good coverage of what to do in Linux kernel compilation for SonyEricsson phone):
lsmod
android_module 654 0 - Live 0x7f007000 (P)
sdio 16532 0 - Live 0x7f000000
“android_module” was the one I had inserted via insmod android_module.ko.
Here’s how to do it:
First the original program was copied from:
http://rechtzeit.wordpress.com/2011/03/21/77/
Or reproduced as follows:
android_module.c:
#include"linux/module.h"
#include"linux/kernel.h"
//replace the "" with angular brackets
int init_module(void)
{
printk(KERN_INFO "Hello android kernel...\n");
return 0;
}
void cleanup_module(void)
{
printk(KERN_INFO "Goodbye android kernel...\n");
}
Makefile:
obj-m += android_module.o
all:
make -C /home/tteikhua/android/sony_ericsson_src/58/kernel/ M=$(PWD) modules
clean:
make -C /home/tteikhua/android/sony_ericsson_src/58/kernel/ M=$(PWD) clean
The directory where the kernel is located (“-C” above) is where kernel is located.
And the following command will use the Makefile from above:
ARCH=arm CROSS_COMPILE=/opt/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-linux-gnueabi- make
As shown above, the cross compiler I had used is from CodeSourcery.
And after insmod android_module.ko you can see the debugging message in dmesg output:
<6>[11184.063507] Hello android kernel...
<7>[11619.209655] msmrtc_timeremote_set_time: 11/29/2011 10:09:36 (04)
<6>[11619.210418] RPC CALL -- TOD TIME UPDATE: ttick = 404244221
<6>[11619.210418] stamp=52910543933046785, freq = 0
<7>[11619.211578] msmrtc_tod_proc_result: 12/29/2011 10:09:36 (03)
<6>[11619.211578] rs30000048 rs30000048.262144: setting system clock to 2011-12-29 10:09:36 UTC (1325153376)
<6>[11662.112365] device rmnet0 left promiscuous mode
<6>[11662.112579] device rmnet0 entered promiscuous mode
<6>[11669.958221] device rmnet0 left promiscuous mode
<6>[11669.958435] device rmnet0 entered promiscuous mode
<7>[11698.181060] msmrtc_timeremote_set_time: 11/29/2011 10:10:55 (04)
<6>[11698.187622] RPC CALL -- TOD TIME UPDATE: ttick = 406832008
<6>[11698.187652] stamp=52910548228014081, freq = 0
<7>[11698.193939] msmrtc_tod_proc_result: 12/29/2011 10:10:55 (03)
<6>[11698.194030] rs30000048 rs30000048.262144: setting system clock to 2011-12-29 10:10:55 UTC (1325153455)
<6>[11814.442901] bq27520 0-0055: bq27520_handle_soc_worker() capacity=97 (100) flags=0x229 ctrl_status=0x28b soh_state=0x3, valid=1
<6>[11984.057373] Goodbye android kernel...
And the “Goodbye” is when rmmod android_module is executed. In between are debugging message from other components in the kernel.
Final words:
The above are written in 2011, for more modern resources, please refe to the following to get started:
https://source.android.com/docs/core/architecture/kernel/modular-kernels
https://source.android.com/docs/core/architecture/kernel
https://source.android.com/docs/setup/build/building-kernels
https://source.android.com/docs/core/architecture/kernel/loadable-kernel-modules

I think I've red that emulator kernel does not support module, so you must compile also the kernel with modules support.
I hope that this link will help you

There are two things you'll need to do. Firstly, create an emulator kernel that supports loadable kernel modules.
There's a comprehensive post here covering the process of setting up the emulator kernel.
There are 2 parts of the instructions to alter:
I find it easiest to keep the kernel within the repo area (in this case, ~/WORKING_DIRECTORY), like so:
cd ~/WORKING_DIRECTORY
mkdir kernel
cd kernel
git clone git://android.git.kernel.org/kernel/common.git
The branch information is no longer correct, however, so where it says:
git checkout -t origin/android-goldfish-2.6.29 -b goldfish
use this instead:
git checkout -t archive/android-gldfish-2.6.29 -b goldfish
As you've found out, the kernel by default is not configured with loadable module support. Enable before compiling. After, this step:
make ARCH=arm goldfish_defconfig
do this:
make ARCH=arm menuconfig
A text-based menu will show up. Use the Up/Down arrow keys to navigate, Space to select an option, Enter to expand a menu (menus have --->) at the end of the line, and Esc-Esc to go back a menu.
Select "Enable loadable module support" by scrolling down and hitting Space
Hit Esc-Esc to exit, and hit Enter to save the new configuration
Now build. Using your setup, it would be:
make ARCH=arm CROSS_COMPILE=/home/<myuser>/WORKING_DIRECTORY/prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/bin/arm-eabi-
Now that that's done you can do the second part, which is making a loadable kernel module. You were almost there, but because you didn't have the kernel source for the emulator, it didn't work. Just take the makefile you have and change KERNEL_DIR to:
KERNEL_DIR ?= /home/<myuser>/WORKING_DIRECTORY/kernel/common