Disassembly of sections in a c program [closed]

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I wrote a very basic Hello World program to know about sections. After using objdump I got all sections. I am using ubuntu 12.04.

in output I found it like that :

1. Disassembly of section .init

2. Disassembly of section .plt

3. Disassembly of section .text

4. __do_global_dtors_aux

5. Disassembly of section .fini

I want to know what those sections are? what data they store? Specially .plt and .fini. About .init and .text I can guess, but what about others?

Answer 1

You should google it : here is the first result. It's a good start to learn more about ELF format.

About .init and .fini, it's here.

Here is a list of the ELF sections with a brief description.

Answer 2

From this handy page:

The next section I want to mention is the .plt section. This contains the jump table that is used when we call functions in the shared library.

And from this page:

.fini

This section holds executable instructions that contribute to the process termination code. That is, when a program exits normally, the system arranges to execute the code in this section.

Answer 3

you might find this brief tutorial helpful. It also contains links to related literature.

"The linker demystified, part 1": http://www.rtos.be/?p=2166

I hope it helps.

Fernando