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/svr4/svr4_util.h

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    1 /*-
    2  * Copyright (c) 1998 Mark Newton
    3  * Copyright (c) 1994 Christos Zoulas
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   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 without 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  * $FreeBSD$
   29  */
   30 
   31 #ifndef _SVR4_UTIL_H_
   32 #define _SVR4_UTIL_H_
   33 
   34 /*#include <compat/common/compat_util.h>*/
   35 #include <vm/vm.h>
   36 #include <vm/vm_param.h>
   37 #include <vm/pmap.h>
   38 #include <machine/vmparam.h>
   39 #include <sys/exec.h>
   40 #include <sys/sysent.h>
   41 #include <sys/cdefs.h>
   42 
   43 #ifdef DEBUG_SVR4
   44 #define DPRINTF(a)      uprintf a;
   45 #else
   46 #define DPRINTF(a)
   47 #endif
   48 
   49 
   50 static __inline caddr_t stackgap_init(void);
   51 static __inline void *stackgap_alloc(caddr_t *, size_t);
   52 
   53 static __inline caddr_t
   54 stackgap_init()
   55 {
   56 #define szsigcode (*(curthread->td_proc->p_sysent->sv_szsigcode))
   57         return (caddr_t)(((caddr_t)PS_STRINGS) - szsigcode - SPARE_USRSPACE);
   58 }
   59 
   60 static __inline void *
   61 stackgap_alloc(sgp, sz)
   62         caddr_t *sgp;
   63         size_t   sz;
   64 {
   65         void    *p = (void *) *sgp;
   66         sz = ALIGN(sz);
   67         if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode))
   68                 return NULL;
   69         *sgp += sz;
   70         return p;
   71 }
   72 
   73 extern const char svr4_emul_path[];
   74 int svr4_emul_find(struct thread *, caddr_t *, const char *, char *,
   75                         char **, int);
   76 
   77 #define CHECKALT(p, sgp, path, i)                                       \
   78         do {                                                            \
   79                 int _error;                                             \
   80                                                                         \
   81                 _error = svr4_emul_find(p, sgp, svr4_emul_path, path,   \
   82                     &path, i);                                          \
   83                 if (_error == EFAULT)                                   \
   84                         return (_error);                                \
   85         } while (0)
   86 
   87 #define CHECKALTEXIST(p, sgp, path) CHECKALT(p, sgp, path, 0)
   88 #define CHECKALTCREAT(p, sgp, path) CHECKALT(p, sgp, path, 1)
   89 
   90 #endif /* !_SVR4_UTIL_H_ */

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