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There is no magic in what the linker is doing. It just needs to create an ELF file with two sections and set the start address.

Check this out http://www.muppetlabs.com/~breadbox/software/tiny/teensy.htm...

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Sigh... "just". Find me 100 programmers capable of writing a C function to call another and tell me how many of them understand the ELF format, or even know that it exists. It's a subject worthy of its own tutorial (which you conveniently linked to), and specifically it's a subject that is rather more complicated than how to write an two x86 Linux system calls.

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