On Mon, Aug 26, 2024 at 06:10:40PM +0000, Adhemerval Zanella wrote: > +static __always_inline ssize_t getrandom_syscall(void *buffer, size_t len, unsigned int flags) > +{ > + register long int x8 asm ("x8") = __NR_getrandom; > + register long int x0 asm ("x0") = (long int) buffer; > + register long int x1 asm ("x1") = (long int) len; > + register long int x2 asm ("x2") = (long int) flags; > + > + asm ("svc 0" : "=r"(x0) : "r"(x8), "0"(x0), "r"(x1), "r"(x2)); > + > + return x0; > +} More generally, it might be best to follow the format used by arch/arm64/include/asm/vdso/gettimeofday.h.