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_emul.h

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    1 /*-
    2  * Copyright (c) 2006 Roman Divacky
    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 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: releng/10.2/sys/compat/linux/linux_emul.h 235063 2012-05-05 19:42:38Z netchild $
   29  */
   30 
   31 #ifndef _LINUX_EMUL_H_
   32 #define _LINUX_EMUL_H_
   33 
   34 #define EMUL_SHARED_HASXSTAT    0x01
   35 
   36 struct linux_emuldata_shared {
   37         int     refs;
   38         int     flags;
   39         int     xstat;
   40         pid_t   group_pid;
   41 
   42         LIST_HEAD(, linux_emuldata) threads; /* head of list of linux threads */
   43 };
   44 
   45 /*
   46  * modeled after similar structure in NetBSD
   47  * this will be extended as we need more functionality
   48  */
   49 struct linux_emuldata {
   50         pid_t   pid;
   51 
   52         int    *child_set_tid;  /* in clone(): Child's TID to set on clone */
   53         int    *child_clear_tid;/* in clone(): Child's TID to clear on exit */
   54 
   55         struct linux_emuldata_shared *shared;
   56 
   57         int     pdeath_signal;          /* parent death signal */
   58         int     flags;                  /* different emuldata flags */
   59 
   60         struct  linux_robust_list_head  *robust_futexes;
   61 
   62         LIST_ENTRY(linux_emuldata) threads;     /* list of linux threads */
   63 };
   64 
   65 struct linux_emuldata   *em_find(struct proc *, int locked);
   66 
   67 /*
   68  * DTrace probes for locks should be fired after locking and before releasing
   69  * to prevent races (to provide data/function stability in dtrace, see the
   70  * output of "dtrace -v ..." and the corresponding dtrace docs).
   71  */
   72 #define EMUL_LOCK(l)            do { \
   73                                     mtx_lock(l); \
   74                                     LIN_SDT_PROBE1(locks, emul_lock, \
   75                                         locked, l); \
   76                                 } while (0)
   77 #define EMUL_UNLOCK(l)          do { \
   78                                     LIN_SDT_PROBE1(locks, emul_lock, \
   79                                         unlock, l); \
   80                                     mtx_unlock(l); \
   81                                 } while (0)
   82 
   83 #define EMUL_SHARED_RLOCK(l)    do { \
   84                                     sx_slock(l); \
   85                                     LIN_SDT_PROBE1(locks, emul_shared_rlock, \
   86                                         locked, l); \
   87                                 } while (0)
   88 #define EMUL_SHARED_RUNLOCK(l)  do { \
   89                                     LIN_SDT_PROBE1(locks, emul_shared_rlock, \
   90                                         unlock, l); \
   91                                     sx_sunlock(l); \
   92                                 } while (0)
   93 #define EMUL_SHARED_WLOCK(l)    do { \
   94                                     sx_xlock(l); \
   95                                     LIN_SDT_PROBE1(locks, emul_shared_wlock, \
   96                                         locked, l); \
   97                                 } while (0)
   98 #define EMUL_SHARED_WUNLOCK(l)  do { \
   99                                     LIN_SDT_PROBE1(locks, emul_shared_wlock, \
  100                                         unlock, l); \
  101                                     sx_xunlock(l); \
  102                                 } while (0)
  103 
  104 /* for em_find use */
  105 #define EMUL_DOLOCK             1
  106 #define EMUL_DONTLOCK           0
  107 
  108 /* emuldata flags */
  109 #define LINUX_XDEPR_REQUEUEOP   0x00000001      /* uses deprecated
  110                                                    futex REQUEUE op*/
  111 
  112 int     linux_proc_init(struct thread *, pid_t, int);
  113 void    linux_proc_exit(void *, struct proc *);
  114 void    linux_schedtail(struct thread *);
  115 void    linux_proc_exec(void *, struct proc *, struct image_params *);
  116 void    linux_kill_threads(struct thread *, int);
  117 
  118 extern struct sx        emul_shared_lock;
  119 extern struct mtx       emul_lock;
  120 
  121 #endif  /* !_LINUX_EMUL_H_ */

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