LCOM1920-T02G10

/*        $NetBSD: ucontext.h,v 1.18 2013/03/06 18:16:58 pooka Exp $        */

/*-

 * Copyright (c) 1999, 2003 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code is derived from software contributed to The NetBSD Foundation

 * by Klaus Klein, and by Jason R. Thorpe.

 *

 * 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.

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS

 * ``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 FOUNDATION OR CONTRIBUTORS

 * 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 _SYS_UCONTEXT_H_

#define _SYS_UCONTEXT_H_

#include <sys/sigtypes.h>

#include <machine/mcontext.h>

typedef struct __ucontext        ucontext_t;

struct __ucontext {

        unsigned int        uc_flags;        /* properties */

        ucontext_t *         uc_link;        /* context to resume */

        sigset_t        uc_sigmask;        /* signals blocked in this context */

        stack_t                uc_stack;        /* the stack used by this context */

        mcontext_t        uc_mcontext;        /* machine state */

#if defined(_UC_MACHINE_PAD)

        long                __uc_pad[_UC_MACHINE_PAD];

#endif

};

#ifndef _UC_UCONTEXT_ALIGN

#define _UC_UCONTEXT_ALIGN (~0)

#endif

/* uc_flags */

#define _UC_SIGMASK        0x01                /* valid uc_sigmask */

#define _UC_STACK        0x02                /* valid uc_stack */

#define _UC_CPU                0x04                /* valid GPR context in uc_mcontext */

#define _UC_FPU                0x08                /* valid FPU context in uc_mcontext */

#if defined(__minix)

#define        _UC_SWAPPED        0x10000

#define _UC_IGNFPU      0x20000

#define _UC_IGNSIGM     0x40000

#endif /* defined(__minix) */

#define        _UC_MD                0x400f0020        /* MD bits.  see below */

/*

 * if your port needs more MD bits, please try to choose bits from _UC_MD

 * first, rather than picking random unused bits.

 *

 * _UC_MD details

 *

 *         _UC_TLSBASE        Context contains valid pthread private pointer 

 *                        All ports must define this MD flag

 *                         0x00040000        hppa, mips

 *                         0x00000020        alpha

 *                        0x00080000        all other ports

 *

 *        _UC_SETSTACK        Context uses signal stack

 *                        0x00020000        arm

 *                        [undefined]        alpha, powerpc and vax

 *                        0x00010000        other ports

 *

 *        _UC_CLRSTACK        Context does not use signal stack

 *                        0x00040000        arm

 *                        [undefined]        alpha, powerpc and vax

 *                        0x00020000        other ports

 *

 *        _UC_POWERPC_VEC Context does not use signal stack

 *                        0x00010000        powerpc only

 *

 *        _UC_POWERPC_SPE        Context contains valid SPE context

 *                        0x00020000        powerpc only

 *

 *        _UC_M68K_UC_USER Used by m68k machdep code, but undocumented

 *                        0x40000000        m68k only

 *

 *        _UC_ARM_VFP        Unused

 *                        0x00010000        arm only

 *

 *        _UC_VM                Context contains valid virtual 8086 context

 *                        0x00040000        i386, amd64 only

 *

 *        _UC_FXSAVE        Context contains FPU context in that 

 *                        is in FXSAVE format in XMM space 

 *                        0x00000020        i386, amd64 only

 */

#ifdef _KERNEL

struct lwp;

void        getucontext(struct lwp *, ucontext_t *);

int        setucontext(struct lwp *, const ucontext_t *);

void        cpu_getmcontext(struct lwp *, mcontext_t *, unsigned int *);

int        cpu_setmcontext(struct lwp *, const mcontext_t *, unsigned int);

int        cpu_mcontext_validate(struct lwp *, const mcontext_t *);

#ifdef __UCONTEXT_SIZE

__CTASSERT(sizeof(ucontext_t) == __UCONTEXT_SIZE);

#endif

#endif /* _KERNEL */

#if defined(__minix)

__BEGIN_DECLS

void resumecontext(ucontext_t *ucp);

/* These functions get and set ucontext structure through PM/kernel. They don't

 * manipulate the stack. */

int getuctx(ucontext_t *ucp);

int setuctx(const ucontext_t *ucp);

__END_DECLS

#endif /* defined(__minix) */

#endif /* !_SYS_UCONTEXT_H_ */