#define    setcontext(u)    setmcontext(&(u)->uc_mcontext)
#define    getcontext(u)    getmcontext(&(u)->uc_mcontext)
typedef struct mcontext mcontext_t;
typedef struct ucontext ucontext_t;

extern    int        swapcontext(ucontext_t*, const ucontext_t*);
extern    void        makecontext(ucontext_t*, void(*)(), int, ...);
extern    int        getmcontext(mcontext_t*);
extern    void        setmcontext(const mcontext_t*);

/*-
 * 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.
 *
 * $FreeBSD: src/sys/sys/ucontext.h,v 1.4 1999/10/11 20:33:17 luoqi Exp $
 */

/* #include <machine/ucontext.h> */

/*-
 * 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.
 *
 * $FreeBSD: src/sys/i386/include/ucontext.h,v 1.4 1999/10/11 20:33:09 luoqi Exp $
 */

struct mcontext {
    /*
     * The first 20 fields must match the definition of
     * sigcontext. So that we can support sigcontext
     * and ucontext_t at the same time.
     */
    int    mc_onstack;        /* XXX - sigcontext compat. */
    int    mc_gs;
    int    mc_fs;
    int    mc_es;
    int    mc_ds;
    int    mc_edi;
    int    mc_esi;
    int    mc_ebp;
    int    mc_isp;
    int    mc_ebx;
    int    mc_edx;
    int    mc_ecx;
    int    mc_eax;
    int    mc_trapno;
    int    mc_err;
    int    mc_eip;
    int    mc_cs;
    int    mc_eflags;
    int    mc_esp;            /* machine state */
    int    mc_ss;

    int    mc_fpregs[28];        /* env87 + fpacc87 + u_long */
    int    __spare__[17];
};

struct ucontext {
    /*
     * Keep the order of the first two fields. Also,
     * keep them the first two fields in the structure.
     * This way we can have a union with struct
     * sigcontext and ucontext_t. This allows us to
     * support them both at the same time.
     * note: the union is not defined, though.
     */
    sigset_t    uc_sigmask;
    mcontext_t    uc_mcontext;

    struct __ucontext *uc_link;
    stack_t        uc_stack;
    int        __spare__[8];
};


