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	* The arguments to the syscall are passed in the out registers by the caller,			* The arguments to the syscall are passed in the out registers by the caller,
	* and are saved in the trap frame. The syscall number is passed in %g1 (and			* and are saved in the trap frame. The syscall number is passed in %g1 (and
	* also saved in the trap frame).			* also saved in the trap frame).
	*/			*/
	void			void
	syscall(struct trapframe *tf)			syscall(struct trapframe *tf)
	{			{
	struct thread *td;			struct thread *td;
	int error;

	td = curthread;			td = curthread;
	td->td_frame = tf;			td->td_frame = tf;

	KASSERT(td != NULL, ("trap: curthread NULL"));			KASSERT(td != NULL, ("trap: curthread NULL"));
	KASSERT(td->td_proc != NULL, ("trap: curproc NULL"));			KASSERT(td->td_proc != NULL, ("trap: curproc NULL"));

	/*			/*
	* For syscalls, we don't want to retry the faulting instruction			* For syscalls, we don't want to retry the faulting instruction
	* (usually), instead we need to advance one instruction.			* (usually), instead we need to advance one instruction.
	*/			*/
	td->td_pcb->pcb_tpc = tf->tf_tpc;			td->td_pcb->pcb_tpc = tf->tf_tpc;
	TF_DONE(tf);			TF_DONE(tf);

	error = syscallenter(td);			syscallenter(td);
	syscallret(td, error);			syscallret(td);
	}			}