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I am using VirtualBoxVM and downloaded ubuntu(64-bit) in linux. I use the platform SASM for my assembly code in NASM in x86 mode. However when I try the use 64 bit operands (such as rax, rbx...) it gives the error "instruction not supported in 32-bit mode".

I tried fixing it but i don`t know what the problem is. Is the problem in my code or is it NASM? An hoe w can I fix it?

Peter Cordes
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oblong_buzzard
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    64-bit registers require 64-bit mode. Configure SASM to build your code as 64-bit if that's what you want to write. (You want it to run `nasm -felf64` rather than `nasm -felf32`.) – Peter Cordes Apr 22 '23 at 09:46

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