The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/freebsd32/freebsd32_util.h

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    1 /*-
    2  * Copyright (c) 1998-1999 Andrew Gallatin
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software withough specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/5.4/sys/compat/freebsd32/freebsd32_util.h 123744 2003-12-23 02:48:11Z peter $
   29  */
   30 
   31 #include <vm/vm.h>
   32 #include <vm/vm_param.h>
   33 #include <vm/pmap.h>
   34 
   35 
   36 #include <sys/exec.h>
   37 #include <sys/sysent.h>
   38 #include <sys/cdefs.h>
   39 
   40 struct freebsd32_ps_strings {
   41         u_int32_t ps_argvstr;   /* first of 0 or more argument strings */
   42         int     ps_nargvstr;    /* the number of argument strings */
   43         u_int32_t ps_envstr;    /* first of 0 or more environment strings */
   44         int     ps_nenvstr;     /* the number of environment strings */
   45 };
   46 
   47 #if defined(__amd64__) || defined(__ia64__)
   48 #include <compat/ia32/ia32_util.h>
   49 #endif
   50 
   51 #define FREEBSD32_PS_STRINGS    \
   52         (FREEBSD32_USRSTACK - sizeof(struct freebsd32_ps_strings))
   53 
   54 static __inline caddr_t stackgap_init(void);
   55 static __inline void *stackgap_alloc(caddr_t *, size_t);
   56 
   57 static __inline caddr_t
   58 stackgap_init()
   59 {
   60 #define szsigcode (*(curproc->p_sysent->sv_szsigcode))
   61         return (caddr_t)(((caddr_t)FREEBSD32_PS_STRINGS) - szsigcode -
   62             SPARE_USRSPACE);
   63 #undef szsigcode
   64 }
   65 
   66 static __inline void *
   67 stackgap_alloc(sgp, sz)
   68         caddr_t *sgp;
   69         size_t   sz;
   70 {
   71         void *p;
   72 
   73         p = (void *) *sgp;
   74         *sgp += ALIGN(sz);
   75         return p;
   76 }

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