sys/emulation/linux/linux_util.h

   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 1.11 2006/12/23 00:27:02 swildner 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 "opt_global.h"
  44
  45 #include <vm/vm.h>
  46 #include <vm/vm_param.h>
  47 #include <vm/pmap.h>
  48 #include <machine/vmparam.h>
  49 #include <sys/exec.h>
  50 #include <sys/sysent.h>
  51 #include <sys/cdefs.h>
  52
  53 #define LINUX_PATH_CREATE 1
  54 #define LINUX_PATH_EXISTS 2
  55
  56 int linux_translate_path(char *, int);
  57 int linux_copyin_path(char *, char **, int);
  58
  59 static __inline void
  60 linux_free_path(char **kname) {
  61         if (*kname) {
  62                 kfree(*kname, M_TEMP);
  63                 *kname = NULL;
  64         }
  65 }
  66
  67 static __inline caddr_t stackgap_init(void);
  68 static __inline void *stackgap_alloc(caddr_t *, size_t);
  69
  70 #define szsigcode(p) (*((p)->p_sysent->sv_szsigcode))
  71
  72 static __inline caddr_t
  73 stackgap_init(void)
  74 {
  75         return (caddr_t)(PS_STRINGS - szsigcode(curproc) - SPARE_USRSPACE);
  76 }
  77
  78 static __inline void *
  79 stackgap_alloc(caddr_t *sgp, size_t sz)
  80 {
  81         void *p = (void *) *sgp;
  82
  83         sz = ALIGN(sz);
  84         if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode(curproc)))
  85                 return NULL;
  86         *sgp += sz;
  87         return p;
  88 }
  89
  90 #define DUMMY(s)                                                        \
  91 int                                                                     \
  92 sys_linux_ ## s(struct linux_ ## s ## _args *args)                      \
  93 {                                                                       \
  94         return (unsupported_msg(#s));                                   \
  95 }                                                                       \
  96 struct __hack
  97
  98 static __inline int
  99 unsupported_msg(const char *fname)
 100 {
 101         struct thread *td = curthread;
 102         if (td->td_proc) {
 103             kprintf(
 104                 "linux: syscall %s is obsoleted or not implemented (pid=%d)\n",
 105                 fname, (int)td->td_proc->p_pid
 106             );
 107         } else {
 108             kprintf(
 109                 "linux: syscall %s is obsoleted or not implemented (td=%p)\n",
 110                 fname, td
 111             );
 112         }
 113         return (ENOSYS);
 114 }
 115
 116 #endif /* !_LINUX_UTIL_H_ */