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/linux/linux_util.h

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    1 /*
    2  * Copyright (c) 1994 Christos Zoulas
    3  * Copyright (c) 1995 Frank van der Linden
    4  * Copyright (c) 1995 Scott Bartram
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * from: svr4_util.h,v 1.5 1994/11/18 02:54:31 christos Exp
   30  * from: linux_util.h,v 1.2 1995/03/05 23:23:50 fvdl Exp
   31  * $FreeBSD: stable/4/sys/compat/linux/linux_util.h 68265 2000-11-02 23:31:28Z obrien $
   32  */
   33 
   34 /*
   35  * This file is pretty much the same as Christos' svr4_util.h
   36  * (for now).
   37  */
   38 
   39 #ifndef _LINUX_UTIL_H_
   40 #define _LINUX_UTIL_H_
   41 
   42 #include "opt_linux.h"
   43 
   44 #include <vm/vm.h>
   45 #include <vm/vm_param.h>
   46 #include <vm/pmap.h>
   47 #include <machine/vmparam.h>
   48 #include <sys/exec.h>
   49 #include <sys/sysent.h>
   50 #include <sys/cdefs.h>
   51 
   52 static __inline caddr_t stackgap_init(void);
   53 static __inline void *stackgap_alloc(caddr_t *, size_t);
   54 
   55 #define szsigcode (*(curproc->p_sysent->sv_szsigcode))
   56 
   57 static __inline caddr_t
   58 stackgap_init()
   59 {
   60         return (caddr_t)(PS_STRINGS - szsigcode - SPARE_USRSPACE);
   61 }
   62 
   63 static __inline void *
   64 stackgap_alloc(sgp, sz)
   65         caddr_t *sgp;
   66         size_t   sz;
   67 {
   68         void *p = (void *) *sgp;
   69 
   70         sz = ALIGN(sz);
   71         if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode))
   72                 return NULL;
   73         *sgp += sz;
   74         return p;
   75 }
   76 
   77 extern const char linux_emul_path[];
   78 
   79 int linux_emul_find __P((struct proc *, caddr_t *, const char *, char *,
   80                         char **, int));
   81 
   82 #define CHECKALT(p, sgp, path, i)                                       \
   83         do {                                                            \
   84                 int _error;                                             \
   85                                                                         \
   86                 _error = linux_emul_find(p, sgp, linux_emul_path, path, \
   87                     &path, i);                                          \
   88                 if (_error == EFAULT)                                   \
   89                         return (_error);                                \
   90         } while (0)
   91 
   92 #define CHECKALTEXIST(p, sgp, path) CHECKALT(p, sgp, path, 0)
   93 #define CHECKALTCREAT(p, sgp, path) CHECKALT(p, sgp, path, 1)
   94 
   95 #define DUMMY(s)                                                        \
   96 int                                                                     \
   97 linux_ ## s(struct proc *p, struct linux_ ## s ## _args *args)          \
   98 {                                                                       \
   99         return (unsupported_msg(p, #s));                                \
  100 }                                                                       \
  101 struct __hack
  102 
  103 static __inline int
  104 unsupported_msg(struct proc *p, const char *fname)
  105 {
  106 
  107         printf("linux: syscall %s is obsoleted or not implemented (pid=%ld)\n",
  108             fname, (long)p->p_pid);
  109         return (ENOSYS);
  110 }
  111 
  112 #endif /* !_LINUX_UTIL_H_ */

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