release/src-rt/include/packed_section_start.h

   1 /*
   2  * Declare directives for structure packing. No padding will be provided
   3  * between the members of packed structures, and therefore, there is no
   4  * guarantee that structure members will be aligned.
   5  *
   6  * Declaring packed structures is compiler specific. In order to handle all
   7  * cases, packed structures should be delared as:
   8  *
   9  * #include <packed_section_start.h>
  10  *
  11  * typedef BWL_PRE_PACKED_STRUCT struct foobar_t {
  12  *    some_struct_members;
  13  * } BWL_POST_PACKED_STRUCT foobar_t;
  14  *
  15  * #include <packed_section_end.h>
  16  *
  17  *
  18  * Copyright (C) 2010, Broadcom Corporation. All Rights Reserved.
  19  *
  20  * Permission to use, copy, modify, and/or distribute this software for any
  21  * purpose with or without fee is hereby granted, provided that the above
  22  * copyright notice and this permission notice appear in all copies.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  25  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  27  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  28  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  29  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  30  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  31  * $Id: packed_section_start.h,v 1.4 2008-12-09 23:43:22 Exp $
  32  */
  33
  34
  35 /* Error check - BWL_PACKED_SECTION is defined in packed_section_start.h
  36  * and undefined in packed_section_end.h. If it is already defined at this
  37  * point, then there is a missing include of packed_section_end.h.
  38  */
  39 #ifdef BWL_PACKED_SECTION
  40         #error "BWL_PACKED_SECTION is already defined!"
  41 #else
  42         #define BWL_PACKED_SECTION
  43 #endif
  44
  45
  46 #if defined(_MSC_VER)
  47         /* Disable compiler warning about pragma pack changing alignment. */
  48         #pragma warning(disable:4103)
  49
  50         /* The Microsoft compiler uses pragmas for structure packing. Other
  51          * compilers use structure attribute modifiers. Refer to
  52          * BWL_PRE_PACKED_STRUCT and BWL_POST_PACKED_STRUCT defined below.
  53          */
  54         #if defined(BWL_DEFAULT_PACKING)
  55                 /* Default structure packing */
  56                 #pragma pack(push, 8)
  57         #else   /* BWL_PACKED_SECTION */
  58                 #pragma pack(1)
  59         #endif   /* BWL_PACKED_SECTION */
  60 #endif   /* _MSC_VER */
  61
  62
  63 /* Declare compiler-specific directives for structure packing. */
  64 #if defined(_MSC_VER)
  65         #define BWL_PRE_PACKED_STRUCT
  66         #define BWL_POST_PACKED_STRUCT
  67 #elif defined(__GNUC__)
  68         #define BWL_PRE_PACKED_STRUCT
  69         #define BWL_POST_PACKED_STRUCT  __attribute__((packed))
  70 #elif defined(__CC_ARM)
  71         #define BWL_PRE_PACKED_STRUCT   __packed
  72         #define BWL_POST_PACKED_STRUCT
  73 #else
  74         #error "Unknown compiler!"
  75 #endif