#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.
     */
    long    mc_onstack;        /* XXX - sigcontext compat. */
    long    mc_rdi;            /* machine state (struct trapframe) */
    long    mc_rsi;
    long    mc_rdx;
    long    mc_rcx;
    long    mc_r8;
    long    mc_r9;
    long    mc_rax;
    long    mc_rbx;
    long    mc_rbp;
    long    mc_r10;
    long    mc_r11;
    long    mc_r12;
    long    mc_r13;
    long    mc_r14;
    long    mc_r15;
    long    mc_trapno;
    long    mc_addr;
    long    mc_flags;
    long    mc_err;
    long    mc_rip;
    long    mc_cs;
    long    mc_rflags;
    long    mc_rsp;
    long    mc_ss;

    long    mc_len;            /* sizeof(mcontext_t) */
#define    _MC_FPFMT_NODEV        0x10000    /* device not present or configured */
#define    _MC_FPFMT_XMM        0x10002
    long    mc_fpformat;
#define    _MC_FPOWNED_NONE    0x20000    /* FP state not used */
#define    _MC_FPOWNED_FPU        0x20001    /* FP state came from FPU */
#define    _MC_FPOWNED_PCB        0x20002    /* FP state came from PCB */
    long    mc_ownedfp;
    /*
     * See <machine/fpu.h> for the internals of mc_fpstate[].
     */
    long    mc_fpstate[64];
    long    mc_spare[8];
};

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];
};


