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/** Dispatch system call */
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/** Dispatch system call */
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__native syscall_handler(__native a1, __native a2, __native a3,
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__native syscall_handler(__native a1, __native a2, __native a3,
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             __native a4, __native id)
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             __native a4, __native id)
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{
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{
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    __native rc;
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    ipl_t ipl;
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    bool exit = false;
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    if (id < SYSCALL_END)
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    if (id < SYSCALL_END)
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        return syscall_table[id](a1,a2,a3,a4);
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        rc = syscall_table[id](a1,a2,a3,a4);
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    else
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    else
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        panic("Undefined syscall %d", id);
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        panic("Undefined syscall %d", id);
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    ipl = interrupts_disable();
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    spinlock_lock(&THREAD->lock);
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    if (THREAD->interrupted)
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        exit = true;
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    spinlock_unlock(&THREAD->lock);
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    interrupts_restore(ipl);
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    if (exit)
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        thread_exit();
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    return rc;
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}
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}
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syshandler_t syscall_table[SYSCALL_END] = {
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syshandler_t syscall_table[SYSCALL_END] = {
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    sys_io,
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    sys_io,
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    sys_tls_set,
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    sys_tls_set,