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Understanding ELF using readelf and objdump

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HowTos

What is ELF? ELF (Executable and Linking Format) is file format that defines how an object file is composed and organized. With this information, your kernel and the binary loader know how to load the file, where to look for the code, where to look the initialized data, which shared library that needs to be loaded and so on.

First of all, you should know about different kind of ELF object:

Relocatable file: an object file that holds code and data suitable for linking with other object files to create an executable or a shared object file. In other word, you can say that relocatable file is a foundation for creating executables and libraries.

This is kind of file you get if you compile a source code like this:

$ gcc -c test.c

That will produce test.o, which is a relocatable file.

Kernel module (either suffixed with .o or .ko) is also a form of relocatable file.

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