service_runtime/sel_util.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 Simple/secure ELF loader (NaCl SEL) misc utilities.
  34  */
  35 #ifndef NATIVE_CLIENT_SERVICE_RUNTIME_SEL_UTIL_H_
  36 #define NATIVE_CLIENT_SERVICE_RUNTIME_SEL_UTIL_H_ 1
  37
  38 #include "native_client/include/portability.h"
  39
  40 #include <sys/types.h>
  41
  42 #include "native_client/service_runtime/nacl_config.h"
  43
  44 size_t  NaClAppPow2Ceil(size_t  max_addr);
  45
  46 /*
  47  * NaClRoundPage is a bit of a misnomer -- it always rounds up to a
  48  * page size, not the nearest.
  49  */
  50 static INLINE size_t  NaClRoundPage(size_t    nbytes)
  51 {
  52   return (nbytes + NACL_PAGESIZE - 1) & ~(NACL_PAGESIZE - 1);
  53 }
  54
  55 static INLINE size_t  NaClRoundAllocPage(size_t    nbytes)
  56 {
  57   return (nbytes + NACL_MAP_PAGESIZE - 1) & ~(NACL_MAP_PAGESIZE - 1);
  58 }
  59
  60 static INLINE size_t NaClTruncPage(size_t  nbytes)
  61 {
  62   return nbytes & ~(NACL_PAGESIZE - 1);
  63 }
  64
  65 static INLINE size_t NaClTruncAllocPage(size_t  nbytes)
  66 {
  67   return nbytes & ~(NACL_MAP_PAGESIZE - 1);
  68 }
  69
  70 static INLINE size_t  NaClBytesToPages(size_t nbytes)
  71 {
  72   return (nbytes + NACL_PAGESIZE - 1) >> NACL_PAGESHIFT;
  73 }
  74
  75 static INLINE int /* bool */ NaClIsPageMultiple(uintptr_t addr_or_size)
  76 {
  77   return 0 == ((NACL_PAGESIZE - 1) & addr_or_size);
  78 }
  79
  80 static INLINE int /* bool */ NaClIsAllocPageMultiple(uintptr_t addr_or_size)
  81 {
  82   return 0 == ((NACL_MAP_PAGESIZE - 1) & addr_or_size);
  83 }
  84
  85 /*
  86  * True host-OS allocation unit.
  87  */
  88 static INLINE size_t NaClRoundHostAllocPage(size_t  nbytes)
  89 {
  90 #if NACL_WINDOWS
  91   return NaClRoundAllocPage(nbytes);
  92 #else   /* NACL_WINDOWS */
  93   return NaClRoundPage(nbytes);
  94 #endif  /* !NACL_WINDOWS */
  95 }
  96
  97 static INLINE size_t NaClRoundPageNumUpToMapMultiple(size_t npages)
  98 {
  99   return (npages + NACL_PAGES_PER_MAP - 1) & ~(NACL_PAGES_PER_MAP - 1);
 100 }
 101
 102 static INLINE size_t NaClTruncPageNumDownToMapMultiple(size_t npages)
 103 {
 104   return npages & ~(NACL_PAGES_PER_MAP - 1);
 105 }
 106
 107 #endif  /* NATIVE_CLIENT_SERVICE_RUNTIME_SEL_UTIL_H_ */