.text _start: movq %cr8, %rax movq %cr8, %rdi movq %rax, %cr8 movq %rdi, %cr8 .att_syntax noprefix movq cr8, rax movq cr8, rdi movq rax, cr8 movq rdi, cr8 .intel_syntax noprefix mov rax, cr8 mov rdi, cr8 mov cr8, rax mov cr8, rdi