service_runtime/sel_memory.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) memory protection abstractions.
  34  */
  35
  36 #ifndef SERVICE_RUNTIME_SEL_MEMORY_H__
  37 #define SERVICE_RUNTIME_SEL_MEMORY_H__ 1
  38
  39 #ifdef __cplusplus
  40 extern "C" {
  41 #endif /* __cplusplus */
  42
  43 /*
  44 * We do not use posix_memalign but instead directly attempt to mmap
  45 * (or VirtualAlloc) memory into aligned addresses, since we want to be
  46 * able to munmap pages to map in shared memory pages for the NaCl
  47 * versions of shmat or mmap, esp if SHM_REMAP is used.  Note that the
  48 * Windows ABI has 4KB pages for operations like page protection, but
  49 * 64KB allocation granularity (see nacl_config.h), and since we want
  50 * host-OS indistinguishability, this means we inherit this restriction
  51 * into our least-common-denominator design.
  52 */
  53 #define MAX_RETRIES     1024
  54
  55 int   NaCl_page_alloc(void    **p,
  56                       size_t  num_bytes);
  57
  58 void  NaCl_page_free(void     *p,
  59                      size_t   num_bytes);
  60
  61 int   NaCl_mprotect(void          *addr,
  62                     size_t        len,
  63                     int           prot);
  64
  65 int   NaCl_madvise(void           *start,
  66                    size_t         length,
  67                    int            advice);
  68 #ifdef __cplusplus
  69 };
  70 #endif /* __cplusplus */
  71
  72 #endif /*  SERVICE_RUNTIME_SEL_MEMORY_H__ */