diff --git a/rt/sys.fn b/rt/sys.fn
new file mode 100644
index 0000000..c0feabf
--- /dev/null
+++ b/rt/sys.fn
@@ -0,0 +1,350 @@
+module rt.sys;
+
+if (__x86 || __x86_64)
+public const tagged SCID
+{
+    read;
+    write;
+    open;
+    close;
+    stat;
+    fstat;
+    lstat;
+    poll;
+    lseek;
+    mmap;
+    mprotect;
+    munmap;
+    brk;
+    rt_sigaction;
+    rt_sigprocmask;
+    rt_sigreturn;
+    ioctl;
+    pread64;
+    pwrite64;
+    readv;
+    writev;
+    access;
+    pipe;
+    select;
+    sched_yield;
+    mremap;
+    msync;
+    mincore;
+    madvise;
+    shmget;
+    shmat;
+    shmctl;
+    dup;
+    dup2;
+    pause;
+    nanosleep;
+    getitimer;
+    alarm;
+    setitimer;
+    getpid;
+    sendfile;
+    socket;
+    connect;
+    accept;
+    sentto;
+    recvfrom;
+    sendmsg;
+    recvmsg;
+    shutdown;
+    bind;
+    listen;
+    getsockname;
+    getpeername;
+    socketpair;
+    setsockopt;
+    getsockopt;
+    clone;
+    fork;
+    vfork;
+    execve;
+    exit;
+    wait4;
+    kill;
+    uname;
+    semget;
+    semop;
+    semctl;
+    shmdt;
+    msgget;
+    msgsnd;
+    msgrcv;
+    msgctl;
+    fcntl;
+    flock;
+    fsync;
+    fdatasync;
+    truncate;
+    ftruncate;
+    getdents;
+    getcwd;
+    chdir;
+    fchdir;
+    rename;
+    mkdir;
+    rmdir;
+    creat;
+    link;
+    unlink;
+    symlink;
+    readlink;
+    chmod;
+    fchmod;
+    chown;
+    fchown;
+    lchown;
+    umask;
+    gettimeofday;
+    getrlimit;
+    getrusage;
+    sysinfo;
+    times;
+    ptrace;
+    getuid;
+    syslog;
+    getgid;
+    setuid;
+    setgid;
+    geteuid;
+    getegid;
+    setpgid;
+    getppid;
+    getpgrp;
+    setsid;
+    setreuid;
+    setregid;
+    getgroups;
+    setgroups;
+    setresuid;
+    getresuid;
+    setresgid;
+    getresgid;
+    getpgid;
+    setfsuid;
+    setfsgid;
+    getsid;
+    capget;
+    capset;
+    rt_sigpending;
+    rt_sigtimedwait;
+    rt_sigqueueinfo;
+    rt_sigsuspend;
+    sigaltstack;
+    utime;
+    mknod;
+    uselib;
+    personality;
+    ustat;
+    statfs;
+    fstatfs;
+    sysfs;
+    getpriority;
+    setpriority;
+    sched_setparam;
+    sched_getparam;
+    sched_setscheduler;
+    sched_getscheduler;
+    sched_get_priority_max;
+    sched_get_priority_min;
+    sched_rr_get_interval;
+    mlock;
+    munlock;
+    mlockall;
+    munlockall;
+    vhangup;
+    modify_ldt;
+    pivot_root;
+    _sysctl;
+    prctl;
+    arch_prctl;
+    adjtimex;
+    setrlimit;
+    chroot;
+    sync;
+    acct;
+    settimeofday;
+    mount;
+    umount2;
+    swapon;
+    swapoff;
+    reboot;
+    sethostname;
+    setdomainname;
+    iopl;
+    ioperm;
+    create_module;
+    init_module;
+    delete_module;
+    get_kernel_syms;
+    query_module;
+    quotactl;
+    nfsservctl;
+    getpmsg;
+    putpmsg;
+    afs_syscall;
+    tuxcall;
+    security;
+    gettid;
+    readahead;
+    setxattr;
+    lsetxattr;
+    fsetxattr;
+    getxattr;
+    lgetxattr;
+    fgetxattr;
+    listxattr;
+    llistxattr;
+    flistxattr;
+    removexattr;
+    lremovexattr;
+    fremovexattr;
+    tkill;
+    time;
+    futex;
+    sched_setaffinity;
+    sched_getaffinity;
+    set_thread_area;
+    io_setup;
+    io_destroy;
+    io_getevents;
+    io_submit;
+    io_cancel;
+    get_thread_area;
+    lookup_dcookie;
+    epoll_create;
+    epoll_ctl_old;
+    epoll_wait_old;
+    remap_file_pages;
+    getdents64;
+    set_tid_address;
+    restart_syscall;
+    semtimedop;
+    fadvise64;
+    timer_create;
+    timer_settime;
+    timer_gettime;
+    timer_getoverrun;
+    timer_delete;
+    clock_settime;
+    clock_gettime;
+    clock_getres;
+    clock_nanosleep;
+    exit_group;
+    epoll_wait;
+    epoll_ctl;
+    tgkill;
+    utimes;
+    vserver;
+    mbind;
+    set_mempolicy;
+    get_mempolicy;
+    mq_open;
+    mq_unlink;
+    mq_timedsend;
+    mq_timedreceive;
+    mq_notify;
+    mq_getsetattr;
+    kexec_load;
+    waitid;
+    add_key;
+    request_key;
+    keyctl;
+    ioprio_set;
+    ioprio_get;
+    inotify_init;
+    inotify_add_watch;
+    inotify_rm_watch;
+    migrate_pages;
+    openat;
+    mkdirat;
+    mknodat;
+    fchownat;
+    futimesat;
+    newfstatat;
+    unlinkat;
+    renameat;
+    linkat;
+    symlinkat;
+    readlinkat;
+    fchmodat;
+    faccessat;
+    pselect6;
+    ppoll;
+    unshare;
+    set_robust_list;
+    get_robust_list;
+    splice;
+    tee;
+    sync_file_range;
+    vmsplice;
+    move_pages;
+    utimensat;
+    epoll_pwait;
+    signalfd;
+    timerfd_create;
+    eventfd;
+    fallocate;
+    timerfd_settime;
+    timerfd_gettime;
+    accept4;
+    signalfd4;
+    eventfd2;
+    epoll_create1;
+    dup3;
+    pipe2;
+    inotify_init1;
+    preadv;
+    pwritev;
+    rt_tgsigqueueinfo;
+    perf_event_open;
+    recvmmsg;
+    fanotify_init;
+    fanotify_mark;
+    prlimit64;
+    name_to_handle_at;
+    open_by_handle_at;
+    clock_adjtime;
+    syncfs;
+    sendmmsg;
+    setns;
+    getcpu;
+    process_vm_readv;
+    process_vm_writev;
+    kcmp;
+    finit_module;
+    sched_setattr;
+    sched_getattr;
+    renameat2;
+    seccomp;
+    getrandom;
+    memfd_create;
+    kexec_file_load;
+    bpf;
+    execveat;
+    userfaultfd;
+    membarrier;
+    mlock2;
+    copy_file_range;
+    preadv2;
+    pwritev2;
+    pkey_mprotect;
+    pkey_alloc;
+    pkey_free;
+    statx;
+    io_pgetevents;
+    rseq;
+    pkey_mprotect2;
+}
+
+void __syscall(ARGS...)(SCID id, ARGS args) trusted;
+{
+    __asm(
+        syscall(none, id, unroll args);
+    );
+    return;
+}
\ No newline at end of file