D26629.diff
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	Index: head/sys/arm64/arm64/trap.c
	===================================================================
	--- head/sys/arm64/arm64/trap.c
	+++ head/sys/arm64/arm64/trap.c
	@@ -123,30 +123,31 @@
	cpu_fetch_syscall_args(struct thread *td)
	{
	struct proc *p;
	- register_t *ap;
	+ register_t ap, dst_ap;
	struct syscall_args *sa;
	- int nap;

	- nap = MAXARGS;
	p = td->td_proc;
	- ap = td->td_frame->tf_x;
	sa = &td->td_sa;
	+ ap = td->td_frame->tf_x;
	+ dst_ap = &sa->args[0];

	sa->code = td->td_frame->tf_x[8];

	- if (sa->code == SYS_syscall \|\| sa->code == SYS___syscall) {
	+ if (__predict_false(sa->code == SYS_syscall \|\| sa->code == SYS___syscall)) {
	sa->code = *ap++;
	- nap--;
	+ } else {
	+ dst_ap++ = ap++;
	}

	- if (sa->code >= p->p_sysent->sv_size)
	+ if (__predict_false(sa->code >= p->p_sysent->sv_size))
	sa->callp = &p->p_sysent->sv_table[0];
	else
	sa->callp = &p->p_sysent->sv_table[sa->code];

	- memcpy(sa->args, ap, nap * sizeof(register_t));
	- if (sa->callp->sy_narg > nap)
	- panic("ARM64TODO: Could we have more than %d args?", MAXARGS);
	+ KASSERT(sa->callp->sy_narg <= nitems(sa->args),
	+ ("Syscall %d takes too many arguments", sa->code));
	+
	+ memcpy(dst_ap, ap, (MAXARGS - 1) * sizeof(register_t));

	td->td_retval[0] = 0;
	td->td_retval[1] = 0;