/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1999 Marcel Moolenaar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer 
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _X86_SIGFRAME_H_
#define _X86_SIGFRAME_H_

/*
 * Signal frames, arguments passed to application signal handlers.
 */

#ifdef __i386__
struct sigframe {
        /*
         * The first four members may be used by applications.
         *
         * NOTE: The 4th argument is undocumented, ill commented
         * on and seems to be somewhat BSD "standard".  Handlers
         * installed with sigvec may be using it.
         */
        register_t      sf_signum;
        register_t      sf_siginfo;     /* code or pointer to sf_si */
        register_t      sf_ucontext;    /* points to sf_uc */
        register_t      sf_addr;        /* undocumented 4th arg */

        union {
                __siginfohandler_t      *sf_action;
                __sighandler_t          *sf_handler;
        } sf_ahu;
        ucontext_t      sf_uc;          /* = *sf_ucontext */
        siginfo_t       sf_si;          /* = *sf_siginfo (SA_SIGINFO case) */
};
#endif /* __i386__ */

#ifdef __amd64__
struct sigframe {
        union {
                __siginfohandler_t      *sf_action;
                __sighandler_t          *sf_handler;
        } sf_ahu;
        ucontext_t      sf_uc;          /* = *sf_ucontext */
        siginfo_t       sf_si;          /* = *sf_siginfo (SA_SIGINFO case) */
};
#endif /* __amd64__ */

#endif /* _X86_SIGFRAME_H_ */