intel/sys/ucontext.h

	ucontext.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_UCONTEXT_H
#define _SYS_UCONTEXT_H

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/feature_tests.h>

#include <sys/types.h>
#include <sys/regset.h>
#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
#include <sys/signal.h>
#endif

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * Inclusion of <sys/signal.h> for sigset_t and stack_t definitions
 * breaks XPG4v2 namespace.  Therefore we must duplicate the defines
 * for these types here when _XPG4_2 is defined.
 */

#if defined(_XPG4_2) && !defined(__EXTENSIONS__)
#ifndef _SIGSET_T
#define _SIGSET_T
typedef struct {    /* signal set type */
    unsigned long   __sigbits[4];
} sigset_t;
#endif /* _SIGSET_T */

#ifndef _STACK_T
#define _STACK_T
typedef struct {
    void    *ss_sp;
    size_t  ss_size;
    int ss_flags;
} stack_t;
#endif /* _STACK_T */
#endif /* defined(_XPG4_2) && !defined(__EXTENSIONS__) */

#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
typedef struct ucontext ucontext_t;
#else
typedef struct __ucontext ucontext_t;
#endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */

#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
struct  ucontext {
#else
struct  __ucontext {
#endif
    unsigned long   uc_flags;
    ucontext_t  *uc_link;
    sigset_t    uc_sigmask;
    stack_t     uc_stack;
    mcontext_t  uc_mcontext;
    long        uc_filler[5];   /* see ABI spec for Intel386 */
};

#if defined(_SYSCALL32)

/* Kernel view of user ILP32 ucontext structure */

typedef struct ucontext32 {
    uint32_t    uc_flags;
    caddr32_t   uc_link;
    sigset32_t  uc_sigmask;
    stack32_t   uc_stack;
    mcontext32_t    uc_mcontext;
    int32_t     uc_filler[5];
} ucontext32_t;

#if defined(_KERNEL)
extern void ucontext_nto32(const ucontext_t *src, ucontext32_t *dest);
extern void ucontext_32ton(const ucontext32_t *src, ucontext_t *dest);
#endif

#endif  /* _SYSCALL32 */

#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
#define GETCONTEXT  0
#define SETCONTEXT  1
#define GETUSTACK   2
#define SETUSTACK   3

/*
 * values for uc_flags
 * these are implementation dependent flags, that should be hidden
 * from the user interface, defining which elements of ucontext
 * are valid, and should be restored on call to setcontext
 */

#define UC_SIGMASK  0x01
#define UC_STACK    0x02
#define UC_CPU      0x04
#define UC_MAU      0x08
#define UC_FPU      UC_MAU

#define UC_MCONTEXT (UC_CPU|UC_FPU)

/*
 * UC_ALL specifies the default context
 */

#define UC_ALL      (UC_SIGMASK|UC_STACK|UC_MCONTEXT)
#endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */

#ifdef _KERNEL
void savecontext(ucontext_t *, k_sigset_t);
void restorecontext(ucontext_t *);

#ifdef _SYSCALL32
extern void savecontext32(ucontext32_t *ucp, k_sigset_t mask);
#endif
#endif

#ifdef  __cplusplus
}
#endif

#endif /* _SYS_UCONTEXT_H */