ref: 3c6c5a02710e4d7a3da6121e9bfb8d2bc0d786dd 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