ucontext.h

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    1 /*      $NetBSD: ucontext.h,v 1.6 2005/02/26 22:25:34 perry Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 1999, 2003 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Klaus Klein, and by Jason R. Thorpe.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 #ifndef _SYS_UCONTEXT_H_
   40 #define _SYS_UCONTEXT_H_
   41 
   42 #if defined(_KERNEL_OPT)
   43 #include "opt_compat_netbsd32.h"
   44 #endif
   45 
   46 #include <sys/sigtypes.h>
   47 #include <machine/mcontext.h>
   48 
   49 typedef struct __ucontext       ucontext_t;
   50 
   51 struct __ucontext {
   52         unsigned int    uc_flags;       /* properties */
   53         ucontext_t *    uc_link;        /* context to resume */
   54         sigset_t        uc_sigmask;     /* signals blocked in this context */
   55         stack_t         uc_stack;       /* the stack used by this context */
   56         mcontext_t      uc_mcontext;    /* machine state */
   57 #if defined(_UC_MACHINE_PAD)
   58         long            __uc_pad[_UC_MACHINE_PAD];
   59 #endif
   60 };
   61 
   62 #ifndef _UC_UCONTEXT_ALIGN
   63 #define _UC_UCONTEXT_ALIGN (~0)
   64 #endif
   65 
   66 #if defined(COMPAT_NETBSD32) && defined(_KERNEL)
   67 
   68 typedef struct __ucontext32       ucontext32_t;
   69 
   70 struct __ucontext32 {
   71         unsigned int    uc_flags;       /* properties */
   72         uint32_t        uc_link;        /* context to resume */
   73         sigset_t        uc_sigmask;     /* signals blocked in this context */
   74         stack32_t       uc_stack;       /* the stack used by this context */
   75         mcontext32_t    uc_mcontext;    /* machine state */
   76 #if defined(_UC_MACHINE32_PAD)
   77         int             __uc_pad[_UC_MACHINE32_PAD];
   78 #endif
   79 };
   80 
   81 #endif /* COMPAT_NETBSD32 && _KERNEL */
   82 
   83 /* uc_flags */
   84 #define _UC_SIGMASK     0x01            /* valid uc_sigmask */
   85 #define _UC_STACK       0x02            /* valid uc_stack */
   86 #define _UC_CPU         0x04            /* valid GPR context in uc_mcontext */
   87 #define _UC_FPU         0x08            /* valid FPU context in uc_mcontext */
   88 
   89 /*
   90  * The following macros are used to convert from a ucontext to sigcontext,
   91  * and vice-versa.  This is for building a sigcontext to deliver to old-style
   92  * signal handlers, and converting back (in the event the handler modifies
   93  * the context).
   94  *
   95  * The only valid use of these macros is to convert a ucontext to a
   96  * sigcontext for old-style signal delivery and then back to the same
   97  * ucontext after the handler has returned.
   98  *
   99  * The _MCONTEXT_TO_SIGCONTEXT() and _SIGCONTEXT_TO_MCONTEXT() macros
  100  * should be provided by <machine/signal.h>.
  101  */
  102 #define _UCONTEXT_TO_SIGCONTEXT(uc, sc)                                 \
  103 do {                                                                    \
  104         (sc)->sc_mask = (uc)->uc_sigmask;                               \
  105         if (((uc)->uc_flags & _UC_STACK) != 0 &&                        \
  106             ((uc)->uc_stack.ss_flags & SS_ONSTACK) != 0)                \
  107                 (sc)->sc_onstack = 1;                                   \
  108         else                                                            \
  109                 (sc)->sc_onstack = 0;                                   \
  110                                                                         \
  111         _MCONTEXT_TO_SIGCONTEXT(uc, sc);                                \
  112 } while (/*CONSTCOND*/0)
  113 
  114 #define _SIGCONTEXT_TO_UCONTEXT(sc, uc)                                 \
  115 do {                                                                    \
  116         (uc)->uc_sigmask = (sc)->sc_mask;                               \
  117                                                                         \
  118         /*                                                              \
  119          * XXX What do do about uc_stack?  See                          \
  120          * XXX kern_sig.c:setucontext().                                \
  121          */                                                             \
  122                                                                         \
  123         _SIGCONTEXT_TO_MCONTEXT(sc, uc);                                \
  124 } while (/*CONSTCOND*/0)
  125 
  126 #ifdef _KERNEL
  127 struct lwp;
  128 
  129 void    getucontext(struct lwp *, ucontext_t *);
  130 int     setucontext(struct lwp *, const ucontext_t *);
  131 void    cpu_getmcontext(struct lwp *, mcontext_t *, unsigned int *);
  132 int     cpu_setmcontext(struct lwp *, const mcontext_t *, unsigned int);
  133 #ifdef COMPAT_NETBSD32
  134 void    getucontext32(struct lwp *, ucontext32_t *);
  135 int     setucontext32(struct lwp *, const ucontext32_t *);
  136 void    cpu_getmcontext32(struct lwp *, mcontext32_t *, unsigned int *);
  137 int     cpu_setmcontext32(struct lwp *, const mcontext32_t *, unsigned int);
  138 #endif /* COMPAT_NETBSD32 */
  139 #endif /* _KERNEL */
  140 
  141 #endif /* !_SYS_UCONTEXT_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/sys/ucontext.h

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sys/sys/ucontext.h