sigframe.h

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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 __user *handler;       /* pointer to the plabel of the signal handler */
    struct siginfo info;
    struct sigcontext sc;
};

extern void ia64_do_signal (struct sigscratch *, long);