0x7f258f1c005b : cmp $0xfffffffffffff000,%rax 0x7f258f1c0061 : ja 0x7f258f1c0065 0x7f258f1c0063 : repz retq 0x7f258f1c0065 : mov 0x207f14(%rip),%rdx # 0x7f258f3c7f80 0x7f258f1c006c : neg %eax 0x7f258f1c006e : mov %eax,%fs:(%rdx) 0x7f258f1c0071 : or $0xffffffffffffffff,%eax 0x7f258f1c0074 : retq 0x7f258f1c0075: nop 0x7f258f1c0076: nop 0x7f258f1c0077: nop 0x7f258f1c0078: nop 0x7f258f1c0079: nop 0x7f258f1c007a: nop 0x7f258f1c007b: nop 0x7f258f1c007c: nop