service_runtime/nacl_globals.c

   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 global scoped objects for handling global resources.
  34  */
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38
  39 #include "native_client/include/portability.h"
  40
  41 #include "native_client/service_runtime/nacl_globals.h"
  42 /* LDT_ENTRIES */
  43
  44 #include "native_client/service_runtime/nacl_config.h"
  45 #include "native_client/service_runtime/nacl_sync.h"
  46 #include "native_client/service_runtime/nacl_threads.h"
  47 #include "native_client/service_runtime/nacl_log.h"
  48 #include "native_client/service_runtime/nacl_secure_random.h"
  49
  50 #include "native_client/service_runtime/sel_rt.h"
  51
  52 struct NaClThreadContext    *nacl_user[LDT_ENTRIES];
  53 struct NaClThreadContext    *nacl_sys[LDT_ENTRIES];
  54
  55 struct NaClMutex            nacl_thread_mu;
  56 struct NaClAppThread        *nacl_thread[LDT_ENTRIES];  /* 8K entries */
  57
  58 uint16_t                    nacl_global_cs;
  59 uint16_t                    nacl_global_ds;
  60
  61 struct NaClTsdKey           nacl_cur_thread_key;
  62
  63 void NaClGlobalModuleInit(void)
  64 {
  65   NaClMutexCtor(&nacl_thread_mu);
  66   nacl_global_cs = NaClGetCs();
  67   nacl_global_ds = NaClGetDs();
  68   /* key for TSD */
  69   if (!NaClTsdKeyCreate(&nacl_cur_thread_key)) {
  70     NaClLog(LOG_FATAL,
  71             "Could not create thread specific data key for cur_thread\n");
  72   }
  73 }
  74
  75 void  NaClGlobalModuleFini(void)
  76 {
  77   NaClMutexDtor(&nacl_thread_mu);
  78 }
  79
  80 struct NaClAppThread  *GetCurThread(void)
  81 {
  82   return NaClTsdGetSpecific(&nacl_cur_thread_key);
  83 }
  84
  85 struct NaClApp *GetCurProc(void)
  86 {
  87   struct NaClAppThread *natp;
  88
  89   natp = GetCurThread();
  90   if (NULL == natp) {
  91     /*
  92      * This should never happen; if we are so lost as to not be able
  93      * to figure out the current thread, we probably cannot log....
  94      */
  95     NaClLog(LOG_FATAL,
  96             "The puce potion hits me and shatters.  Which thread am I?!?\n");
  97     return (struct NaClApp *) NULL;
  98   }
  99   return natp->nap;
 100 }