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struct sigscratch {
	unsigned long scratch_unat;	/* ar.unat for the general registers saved in pt */
	unsigned long ar_pfs;		/* for syscalls, the user-level function-state  */
	struct pt_regs pt;
};
 
struct sigframe {
	/*
	 * Place signal handler args where user-level unwinder can find them easily.
	 * DO NOT MOVE THESE.  They are part of the IA-64 Linux ABI and there is
	 * user-level code that depends on their presence!
	 */
	unsigned long arg0;		/* signum */
	unsigned long arg1;		/* siginfo pointer */
	unsigned long arg2;		/* sigcontext pointer */
	/*
	 * End of architected state.
	 */
 
	void *handler;			/* pointer to the plabel of the signal handler */
	struct siginfo info;
	struct sigcontext sc;
};