service_runtime/nacl_memory_object.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 Simple/secure ELF loader (NaCl SEL) memory object.
  34  */
  35
  36 #include <stdlib.h>
  37
  38 #include "native_client/service_runtime/nacl_log.h"
  39 #include "native_client/service_runtime/nacl_sync_checked.h"
  40 #include "native_client/service_runtime/nacl_memory_object.h"
  41
  42 /*
  43  * Takes ownership of NaClDesc object, so no manipulation of ref count.
  44  */
  45 int NaClMemObjCtor(struct NaClMemObj  *nmop,
  46                    struct NaClDesc    *ndp,
  47                    off_t              nbytes,
  48                    off_t              offset)
  49 {
  50   if (NULL == ndp) {
  51     NaClLog(LOG_FATAL, "NaClMemObjCtor: ndp is NULL\n");
  52   }
  53   nmop->ndp = ndp;
  54   NaClDescRef(ndp);
  55   nmop->nbytes = nbytes;
  56   nmop->offset = offset;
  57   return 1;
  58 }
  59
  60 /*
  61  * Placement new copy ctor.
  62  */
  63 int NaClMemObjCopyCtorOff(struct NaClMemObj *nmop,
  64                           struct NaClMemObj *src,
  65                           off_t             additional)
  66 {
  67   nmop->ndp = src->ndp;
  68   NaClDescRef(nmop->ndp);
  69   nmop->nbytes = src->nbytes;
  70   nmop->offset = src->offset + additional;
  71   return 1;
  72 }
  73
  74 void NaClMemObjDtor(struct NaClMemObj *nmop)
  75 {
  76   NaClDescUnref(nmop->ndp);
  77   nmop->ndp = NULL;
  78   nmop->nbytes = 0;
  79   nmop->offset = 0;
  80 }
  81
  82 struct NaClMemObj *NaClMemObjMake(struct NaClDesc *ndp,
  83                                   off_t           nbytes,
  84                                   off_t           offset)
  85 {
  86   struct NaClMemObj *nmop;
  87
  88   if (NULL == ndp) {
  89     NaClLog(LOG_WARNING, "NaClMemObjMake: invoked with NULL ndp\n");
  90     return NULL;  /* anonymous paging file backed memory */
  91   }
  92   if (NULL == (nmop = malloc(sizeof *nmop))) {
  93     NaClLog(LOG_FATAL, ("NaClMemObjMake: out of memory creating object"
  94                         " (NaClDesc = 0x%08x, offset = 0x%x)\n"),
  95             (uintptr_t) ndp, offset);
  96   }
  97   (void) NaClMemObjCtor(nmop, ndp, nbytes, offset);
  98   return nmop;
  99 }
 100
 101 struct NaClMemObj *NaClMemObjSplit(struct NaClMemObj  *orig,
 102                                    off_t              additional)
 103 {
 104   struct NaClMemObj *nmop;
 105   if (orig == NULL)
 106     return NULL;
 107
 108   if (NULL == (nmop = malloc(sizeof *nmop))) {
 109     NaClLog(LOG_FATAL, ("NaClMemObjSplit: out of memory creating object"
 110                         " (NaClMemObj = 0x%08x, additional = 0x%x)\n"),
 111             (uintptr_t) orig, additional);
 112   }
 113   NaClMemObjCopyCtorOff(nmop, orig, additional);
 114   return nmop;
 115 }
 116
 117 void NaClMemObjIncOffset(struct NaClMemObj  *nmop,
 118                          off_t              additional)
 119 {
 120   nmop->offset += additional;
 121 }