ref: bcedb21933bb5b585d6e65bd17eb2aaadf5f95a6 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