ref: 12934f8fb43662ca8bc906caaad5f5e8ccbb6bc1 dir: /lib/c/arch/amd64/linux/_cerrno.s/
.file "_cerrno.s" .globl _cerrno _cerrno: cmpq $0,%rax js 1f retq 1: neg %rax mov %eax,(errno) mov $-1,%eax retq