ref: c7b8a9f86b3e6aecc69448a6aa724938a57c9de2 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