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 76