Decompile Kernel - Android Q&A, Help & Troubleshooting

Hey does anybody have a TUT in how to decompile an existing kernel so i can make some changes and then recompile it?
Sent from my GT-I9001 using XDA

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Hey did you ever get your answer? I am also looking to do the same thanks.

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EternalFame said:
Hey does anybody have a TUT in how to decompile an existing kernel so i can make some changes and then recompile it?
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This is not the way it's done.
You'll have to get your kernels configuration. This is done either by see if there's a /proc/config.gz using the running kernel, or using the extract-ikconfig script shipped with the kernel source to extract the configuration from the kernel file.
Code:
$ extract-ikconfig kernel.img-kernel
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.32.9
#
CONFIG_ARM=y
CONFIG_SYS_SUPPORTS_APM_EMULATION=y
CONFIG_GENERIC_GPIO=y
CONFIG_GENERIC_TIME=y
[...]
This configuration you supply to the kernel source. If the vendor got some specific patches (they do), you'll have to get the kernel source from them, patches included. They must supply you the source, or be in violation of the GNU General Public License.
Building the Android boot image using mkbootimg, you'll also have to get the base address from this config.
Code:
$ extract-ikconfig kernel.img-kernel | grep PHYS_OFFSET
CONFIG_PHYS_OFFSET=[B]0x00200000[/B]
Now you have everything you'll need to build a correctly configured kernel and making the Android boot image. Detailed build instructions are included in the kernel source as well.

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Wow thank you
Sent from my SGH-T989 using xda premium

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Can we extract kernel with dsixda kitchen?
Edward Cullen

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Kernel can be extracted, rename to *.zip

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purrungo said:
Kernel can be extracted, rename to *.zip
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it kernel.lz or etc format when use extractor it say corrupted archive

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why manufacturers have to provide kernel to users when they don't want users to modify their products?. Many manufacturers just sell devices, and strangely there are many dev.er who CaN overclock or patch, modify the kernel with boot.img, HOW did they do thAt??? Kernel source code sometimes is their devevloper source code, not from manufacture stock source code.

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i want to de and recompile kernel file for WSA
(windows subsystem for android)
any help?

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foxhackerr said:
Any help?
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Depending on what/how much you want to modify it can be easier to patch an existing kernel than to build from scratch. Me? I'm lazy. I never build anything.
Get boot image
Extract kernel
Decompress kernel
Extract kallsyms
Disassemble kernel
Come up with a patch and patch it
Put it back together
(Steps 4 & 5 may be combined depending on your tools. I do them separately.)

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Renate said:
Depending on what/how much you want to modify it can be easier to patch an existing kernel than to build from scratch. Me? I'm lazy. I never build anything.
Get boot image
Extract kernel
Decompress kernel
Extract kallsyms
Disassemble kernel
Come up with a patch and patch it
Put it back together
(Steps 4 & 5 may be combined depending on your tools. I do them separately.)
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How to do this??

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kxrma said:
How to do this??
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Use dd if rooted or EDL or extract from update
I use my imgutil.exe
I use my imgutil.exe
I use my kallsyms.exe or cat /proc/kallsyms on a running system
I use the stock objdump processed afterward with my own findref.exe (not really released yet). You could use Ghidra.
Use any hex editor. I also use my own kpatch.exe (not really released yet).
I use my imgutil.exe