[ARM][x86_64]ElfTool - Pack and unpack boot image for sony mobile devices

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ElfTool

This tool will help you to pack and unpack boot image for sony mobile devices.

Usage :
For unpacking

elftool unpack -i input-path -o output-path

For packing
If you have header file containing address of kernel, ramdisk etc..

elftool pack -o output-path header=path/to/header kernel-path ramdisk-path,ramdisk ipl-path,ipl rpm-path,rpm cmdline-path@cmdline

Else

elftool pack -o output-path kernel-path@address ramdisk-path@address,ramdisk ipl-path@address,ipl rpm-path@address,rpm cmdline-path@cmdline

The tool was created for injecting twrp recovery ramdisk to fxp cm10 boot images to prevent overwriting of cwm ramdisk over twrp ramdisk. I hope this tool will be useful for other developers also.

Here is how I used it for injecting twrp to fxp cm10 boot images.

During start of twrp run backup.sh. This will extract twrp ramdisk from the boot partition and store it in /cache/backup

mount /cache
cd /cache
mkdir backup
cd backup
dump_image /dev/block/mmcblk0p3 /cache/backup/oldboot.img
mkdir oldboot
elftool unpack -i /cache/backup/oldboot.img -o /cache/backup/oldboot
cd oldboot
mkdir uramdisk
cd uramdisk
gzip -dc ../ramdisk | cpio -i
mv sbin/ramdisk-recovery.cpio /cache/backup/ramdisk-recovery.cpio
cd /cache/backup
rm -irf oldboot
rm oldboot.img

When a new zip file is installed inject.sh is run. This will extract the newly installed boot image and inject the twrp ramdisk into it and then flash the newly created bootimage.

#!/sbin/sh
mount /cache
dump_image /dev/block/mmcblk0p3 /cache/newboot.img
mkdir /cache/newboot
elftool unpack -i /cache/newboot.img -o /cache/newboot
rm cache/newboot.img
cd /cache/newboot
mkdir uramdisk
cd uramdisk
gzip -dc ../ramdisk | cpio -i
rm ../ramdisk
if [ -e "/cache/backup/ramdisk-recovery.cpio" ];then
	cp /cache/backup/ramdisk-recovery.cpio sbin/ramdisk-recovery.cpio
	cd ..
	mkbootfs uramdisk > ramdisk.cpio
	cat ramdisk.cpio | gzip > ramdisk
	rm -irf uramdisk
	rm ramdisk.cpio
	elftool pack -o /cache/injectboot.img kernel@0x00208000 ramdisk@0x01400000,ramdisk cmdline@cmdline
	cd /cache
	rm -irf newboot
	if [ -e "/cache/injectboot.img" ];then
		erase_image /dev/block/mmcblk0p3
		flash_image /dev/block/mmcblk0p3 /cache/injectboot.img
		rm /cache/injectboot.img
	fi
fi

Both arm and x86_64 versions are available.

Thanks to sony for providing boot image format in packelf.py

Source code can be found here

yeah
thanks bro