https://www.youtube.com/watch?v=6S5KRJv-7RU

rdi
rsi
r8
r - 64 bit pointer

mov rdi,8
mov rdi,rsi

memory operations

mov rdi, qword ptr[rsi]  values from memory into register
mov qword ptr[rsi], rdi  store into memory operation

https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/


Compilation:
    as -c assemblyexample1.asm -o assemblyexample1.o
    gcc assemblyexample1.o -o assemblyexample1 -nostdlib -static

Check error code:
    echo $?