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/emulation/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: src/sys/compat/linux/linux_util.h,v 1.12.2.2 2000/11/02 23:31:28 obrien Exp $
   32  * $DragonFly: src/sys/emulation/linux/linux_util.h,v 1.12 2008/09/28 05:08:16 dillon Exp $
   33  */
   34 
   35 /*
   36  * This file is pretty much the same as Christos' svr4_util.h
   37  * (for now).
   38  */
   39 
   40 #ifndef _LINUX_UTIL_H_
   41 #define _LINUX_UTIL_H_
   42 
   43 #include <vm/vm.h>
   44 #include <vm/vm_param.h>
   45 #include <vm/pmap.h>
   46 #include <machine/vmparam.h>
   47 #include <sys/exec.h>
   48 #include <sys/sysent.h>
   49 #include <sys/cdefs.h>
   50 
   51 #define LINUX_PATH_CREATE 1
   52 #define LINUX_PATH_EXISTS 2
   53 
   54 int linux_translate_path(char *, int);
   55 int linux_copyin_path(char *, char **, int);
   56 
   57 static __inline void
   58 linux_free_path(char **kname) {
   59         if (*kname) {
   60                 kfree(*kname, M_TEMP);
   61                 *kname = NULL;
   62         }
   63 }
   64 
   65 static __inline caddr_t stackgap_init(void);
   66 static __inline void *stackgap_alloc(caddr_t *, size_t);
   67 
   68 #define szsigcode(p) (*((p)->p_sysent->sv_szsigcode))
   69 
   70 static __inline caddr_t
   71 stackgap_init(void)
   72 {
   73         return (caddr_t)(PS_STRINGS - szsigcode(curproc) - SPARE_USRSPACE);
   74 }
   75 
   76 static __inline void *
   77 stackgap_alloc(caddr_t *sgp, size_t sz)
   78 {
   79         void *p = (void *) *sgp;
   80 
   81         sz = ALIGN(sz);
   82         if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode(curproc)))
   83                 return NULL;
   84         *sgp += sz;
   85         return p;
   86 }
   87 
   88 #define DUMMY(s)                                                        \
   89 int                                                                     \
   90 sys_linux_ ## s(struct linux_ ## s ## _args *args)                      \
   91 {                                                                       \
   92         return (unsupported_msg(#s));                                   \
   93 }                                                                       \
   94 struct __hack
   95 
   96 static __inline int
   97 unsupported_msg(const char *fname)
   98 {
   99         struct thread *td = curthread;
  100         if (td->td_proc) {
  101             kprintf(
  102                 "linux: syscall %s is obsoleted or not implemented (pid=%d)\n",
  103                 fname, (int)td->td_proc->p_pid
  104             );
  105         } else {
  106             kprintf(
  107                 "linux: syscall %s is obsoleted or not implemented (td=%p)\n",
  108                 fname, td
  109             );
  110         }
  111         return (ENOSYS);
  112 }
  113 
  114 #define INO64TO32(v64)  ((l_ulong)(v64) ^ (l_ulong)((v64) >> 32))
  115 
  116 #endif /* !_LINUX_UTIL_H_ */

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