r/asm

I am a Java programmer, and as a hobby, I want to learn C with a focus on operating systems—specifically to modify existing open-source operating systems like GNU/Linux or BSD.

However, I understand that before learning C, it is a good idea to learn some assembly language. What is the best way to learn x86_64 assembly?

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X: lds si,[bx+si]

add al,0xad

out 61h,al

jmp short X+1