ucontext.h

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    1 /*      $NetBSD: ucontext.h,v 1.19 2018/02/27 23:09:02 uwe 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  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _SYS_UCONTEXT_H_
   33 #define _SYS_UCONTEXT_H_
   34 
   35 #include <sys/sigtypes.h>
   36 #include <machine/mcontext.h>
   37 
   38 typedef struct __ucontext       ucontext_t;
   39 
   40 struct __ucontext {
   41         unsigned int    uc_flags;       /* properties */
   42         ucontext_t *    uc_link;        /* context to resume */
   43         sigset_t        uc_sigmask;     /* signals blocked in this context */
   44         stack_t         uc_stack;       /* the stack used by this context */
   45         mcontext_t      uc_mcontext;    /* machine state */
   46 #if defined(_UC_MACHINE_PAD)
   47         long            __uc_pad[_UC_MACHINE_PAD];
   48 #endif
   49 };
   50 
   51 #ifndef _UC_UCONTEXT_ALIGN
   52 #define _UC_UCONTEXT_ALIGN (~0)
   53 #endif
   54 
   55 /* uc_flags */
   56 #define _UC_SIGMASK     0x01            /* valid uc_sigmask */
   57 #define _UC_STACK       0x02            /* valid uc_stack */
   58 #define _UC_CPU         0x04            /* valid GPR context in uc_mcontext */
   59 #define _UC_FPU         0x08            /* valid FPU context in uc_mcontext */
   60 #define _UC_MD          0x400f0020      /* MD bits.  see below */
   61 
   62 /*
   63  * if your port needs more MD bits, please try to choose bits from _UC_MD
   64  * first, rather than picking random unused bits.
   65  *
   66  * _UC_MD details
   67  *
   68  *      _UC_TLSBASE     Context contains valid pthread private pointer 
   69  *                      All ports must define this MD flag
   70  *                      0x00040000      hppa, mips
   71  *                      0x00000020      alpha
   72  *                      0x00080000      all other ports
   73  *
   74  *      _UC_SETSTACK    Context uses signal stack
   75  *                      0x00020000      arm
   76  *                      [undefined]     alpha, powerpc and vax
   77  *                      0x00010000      other ports
   78  *
   79  *      _UC_CLRSTACK    Context does not use signal stack
   80  *                      0x00040000      arm
   81  *                      [undefined]     alpha, powerpc and vax
   82  *                      0x00020000      other ports
   83  *
   84  *      _UC_POWERPC_VEC Context contains valid AltiVec context
   85  *                      0x00010000      powerpc only
   86  *
   87  *      _UC_POWERPC_SPE Context contains valid SPE context
   88  *                      0x00020000      powerpc only
   89  *
   90  *      _UC_M68K_UC_USER Used by m68k machdep code, but undocumented
   91  *                      0x40000000      m68k only
   92  *
   93  *      _UC_ARM_VFP     Unused
   94  *                      0x00010000      arm only
   95  *
   96  *      _UC_VM          Context contains valid virtual 8086 context
   97  *                      0x00040000      i386, amd64 only
   98  *
   99  *      _UC_FXSAVE      Context contains FPU context in that 
  100  *                      is in FXSAVE format in XMM space 
  101  *                      0x00000020      i386, amd64 only
  102  */
  103 
  104 #ifdef _KERNEL
  105 struct lwp;
  106 
  107 void    getucontext(struct lwp *, ucontext_t *);
  108 int     setucontext(struct lwp *, const ucontext_t *);
  109 void    cpu_getmcontext(struct lwp *, mcontext_t *, unsigned int *);
  110 int     cpu_setmcontext(struct lwp *, const mcontext_t *, unsigned int);
  111 int     cpu_mcontext_validate(struct lwp *, const mcontext_t *);
  112 
  113 #ifdef __UCONTEXT_SIZE
  114 __CTASSERT(sizeof(ucontext_t) == __UCONTEXT_SIZE);
  115 #endif
  116 #endif /* _KERNEL */
  117 
  118 #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