ref: 2472ad09ad5d993096556543f2c5ce8f786223c1 dir: /src/libc/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