service_runtime/nacl_globals.h

   1 /*
   2  * Copyright 2008, Google Inc.
   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 are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * NaCl Server Runtime globals.
  34  */
  35
  36 #ifndef SERVICE_RUNTIME_NACL_GLOBALS_H__
  37 #define SERVICE_RUNTIME_NACL_GLOBALS_H__  1
  38
  39 /* for LDT_ENTRIES */
  40 #include "native_client/include/nacl_platform.h"
  41
  42 #include "native_client/service_runtime/nacl_config.h"
  43 #include "native_client/service_runtime/nacl_sync.h"
  44 #include "native_client/service_runtime/sel_rt.h"
  45 #include "native_client/service_runtime/nacl_app_thread.h"
  46
  47 extern struct NaClThreadContext *nacl_user[LDT_ENTRIES];
  48 extern struct NaClThreadContext *nacl_sys[LDT_ENTRIES];
  49 /*
  50  * nacl_user and nacl_sys are accessed w/o holding any locks.  once a
  51  * thread is live, only that thread itself may read/write the register
  52  * context contents (based on its %gs), and this allows a thread to
  53  * context switch from the application to the runtime, since we must
  54  * have a secure stack before calling any code, including lock
  55  * acquisition code.
  56  */
  57
  58 extern struct NaClMutex         nacl_thread_mu;
  59 extern struct NaClAppThread     *nacl_thread[LDT_ENTRIES];
  60 /*
  61  * nacl_thread_mu protects access to nacl_thread, which are
  62  * dynamically allocated (kernel stacks are too large to keep around
  63  * one for each potential thread).  once the pointer is accessed and
  64  * the object's lock held, nacl_thread_mu may be dropped.
  65  */
  66
  67 void  NaClGlobalModuleInit(void);
  68 void  NaClGlobalModuleFini(void);
  69
  70 extern uint16_t nacl_global_cs;
  71 extern uint16_t nacl_global_ds;
  72
  73 /* hack for gdb */
  74 extern uintptr_t nacl_global_xlate_base;
  75
  76 struct NaClApp        *GetCurProc(void);
  77 struct NaClAppThread  *GetCurThread(void);
  78
  79 extern int NaClSrpcFileDescriptor;
  80 #endif