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;};