ref: c7b8a9f86b3e6aecc69448a6aa724938a57c9de2 dir: /lib/c/arch/arm64/linux/_cerrno.s/
.file "_cerrno.s" .globl _cerrno _cerrno: cmp x0,#0 b.lt 1f ret 1: neg x0,x0 adr x1,errno str w1,[x0] mov x0,#-1 ret