NULL pointer

[hutch--]

I am not sure of your point here, the world is full of things that many people don't understand.

> I only see a bizarre program that accomplishes absolutely nothing.

It is probably the case that your value judgement about what and why the code was posted is not something you understand, many people write test code or demo code and there is no guarantee that many others will grasp what it is but they usually do and with a complex subject, this is nothing abnormal.

[deeR44]

...In linux, main entry point don't start at static address 401000h if we choose Position Independent Code...

You may be correct, since Linux was mentioned. I tried the version that mineiro said runs on Windows and all it did was call a procedure with an argument and the procedure returned the argument it received in a register. Now I may not understand something that complex as you pointed out, but that doesn't help me understand all the strange code in the program to accomplish that.