I am puzzled about the register naming in intel architectures. Some sources present them as rax, for example, while other sources, including the dissasembly from objdump, as %rax. What is the meaning of that percent sign?
There are two major syntax forms for x86 assembly language - Intel and AT&T, and percent sign indicates AT&T one, which is historically used in unix universe.
It's not only about naming. Operation arguments direction is reversed, addressing is a little different, and some other things.
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