sys_utrace
return sys_utrace(l, &ua, retval);
.sy_call = (sy_call_t *)sys_utrace
__strong_alias(sys_utrace,sys_nosys);
{ 306, sys_utrace },
extern sy_call_t sys_utrace;
check_syscall_args(sys_utrace)
int sys_utrace(struct lwp *, const struct sys_utrace_args *, register_t *);