=> 0x7fc178b1b0a2 : lock xadd %eax,(%rdi) 0x7fc178b1b0a6 : retq 0x7fc178b1b0a7: nopw 0x0(%rax,%rax,1) 0x7fc178b1b0b0 : lock add %esi,(%rdi) 0x7fc178b1b0b3 : retq 0x7fc178b1b0b4: data32 data32 nopw %cs:0x0(%rax,%rax,1) 0x7fc178b1b0c0 : mov %esi,%eax 0x7fc178b1b0c2 : lock cmpxchg %edx,(%rdi) 0x7fc178b1b0c6 : sete %al 0x7fc178b1b0c9 : movzbl %al,%eax 0x7fc178b1b0cc : retq 0x7fc178b1b0cd: nopl (%rax) 0x7fc178b1b0d0 : mov %rsi,%rax 0x7fc178b1b0d3 : lock cmpxchg %rdx,(%rdi) 0x7fc178b1b0d8 : sete %al 0x7fc178b1b0db : movzbl %al,%eax