1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Declare directives for structure packing. No padding will be provided
3*4882a593Smuzhiyun * between the members of packed structures, and therefore, there is no
4*4882a593Smuzhiyun * guarantee that structure members will be aligned.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Declaring packed structures is compiler specific. In order to handle all
7*4882a593Smuzhiyun * cases, packed structures should be delared as:
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * #include <packed_section_start.h>
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * typedef BWL_PRE_PACKED_STRUCT struct foobar_t {
12*4882a593Smuzhiyun * some_struct_members;
13*4882a593Smuzhiyun * } BWL_POST_PACKED_STRUCT foobar_t;
14*4882a593Smuzhiyun *
15*4882a593Smuzhiyun * #include <packed_section_end.h>
16*4882a593Smuzhiyun *
17*4882a593Smuzhiyun *
18*4882a593Smuzhiyun * Copyright (C) 2020, Broadcom.
19*4882a593Smuzhiyun *
20*4882a593Smuzhiyun * Unless you and Broadcom execute a separate written software license
21*4882a593Smuzhiyun * agreement governing use of this software, this software is licensed to you
22*4882a593Smuzhiyun * under the terms of the GNU General Public License version 2 (the "GPL"),
23*4882a593Smuzhiyun * available at http://www.broadcom.com/licenses/GPLv2.php, with the
24*4882a593Smuzhiyun * following added to such license:
25*4882a593Smuzhiyun *
26*4882a593Smuzhiyun * As a special exception, the copyright holders of this software give you
27*4882a593Smuzhiyun * permission to link this software with independent modules, and to copy and
28*4882a593Smuzhiyun * distribute the resulting executable under terms of your choice, provided that
29*4882a593Smuzhiyun * you also meet, for each linked independent module, the terms and conditions of
30*4882a593Smuzhiyun * the license of that module. An independent module is a module which is not
31*4882a593Smuzhiyun * derived from this software. The special exception does not apply to any
32*4882a593Smuzhiyun * modifications of the software.
33*4882a593Smuzhiyun *
34*4882a593Smuzhiyun *
35*4882a593Smuzhiyun * <<Broadcom-WL-IPTag/Dual:>>
36*4882a593Smuzhiyun */
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun /* EFI does not support STATIC_ASSERT */
39*4882a593Smuzhiyun #if defined(EFI)
40*4882a593Smuzhiyun #define _alignment_test_
41*4882a593Smuzhiyun #endif /* EFI */
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun #ifndef _alignment_test_
44*4882a593Smuzhiyun #define _alignment_test_
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun /* ASSERT default packing */
47*4882a593Smuzhiyun typedef struct T4 {
48*4882a593Smuzhiyun uint8 a;
49*4882a593Smuzhiyun uint32 b;
50*4882a593Smuzhiyun uint16 c;
51*4882a593Smuzhiyun uint8 d;
52*4882a593Smuzhiyun } T4_t;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun /* 4 byte alignment support */
55*4882a593Smuzhiyun /*
56*4882a593Smuzhiyun * a . . .
57*4882a593Smuzhiyun * b b b b
58*4882a593Smuzhiyun * c c d .
59*4882a593Smuzhiyun */
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun /*
62*4882a593Smuzhiyun * Below function is meant to verify that this file is compiled with the default alignment of 4.
63*4882a593Smuzhiyun * Function will fail to compile if the condition is not met.
64*4882a593Smuzhiyun */
65*4882a593Smuzhiyun #ifdef __GNUC__
66*4882a593Smuzhiyun #define VARIABLE_IS_NOT_USED __attribute__ ((unused))
67*4882a593Smuzhiyun #else
68*4882a593Smuzhiyun #define VARIABLE_IS_NOT_USED
69*4882a593Smuzhiyun #endif
70*4882a593Smuzhiyun static void alignment_test(void);
71*4882a593Smuzhiyun static void
alignment_test(void)72*4882a593Smuzhiyun VARIABLE_IS_NOT_USED alignment_test(void)
73*4882a593Smuzhiyun {
74*4882a593Smuzhiyun /* verify 4 byte alignment support */
75*4882a593Smuzhiyun STATIC_ASSERT(sizeof(T4_t) == 12);
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun #endif /* _alignment_test_ */
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun /* Error check - BWL_PACKED_SECTION is defined in packed_section_start.h
80*4882a593Smuzhiyun * and undefined in packed_section_end.h. If it is already defined at this
81*4882a593Smuzhiyun * point, then there is a missing include of packed_section_end.h.
82*4882a593Smuzhiyun */
83*4882a593Smuzhiyun #ifdef BWL_PACKED_SECTION
84*4882a593Smuzhiyun #error "BWL_PACKED_SECTION is already defined!"
85*4882a593Smuzhiyun #else
86*4882a593Smuzhiyun #define BWL_PACKED_SECTION
87*4882a593Smuzhiyun #endif
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun #if defined(BWL_DEFAULT_PACKING)
90*4882a593Smuzhiyun /* generate an error if BWL_DEFAULT_PACKING is defined */
91*4882a593Smuzhiyun #error "BWL_DEFAULT_PACKING not supported any more."
92*4882a593Smuzhiyun #endif /* BWL_PACKED_SECTION */
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun #if defined(_MSC_VER)
95*4882a593Smuzhiyun #pragma warning(disable:4103)
96*4882a593Smuzhiyun #pragma pack(push)
97*4882a593Smuzhiyun #pragma pack(1)
98*4882a593Smuzhiyun #endif
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun #if defined(__GNUC__) && defined(EFI)
101*4882a593Smuzhiyun #pragma pack(push)
102*4882a593Smuzhiyun #pragma pack(1)
103*4882a593Smuzhiyun #endif
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun /* Declare compiler-specific directives for structure packing. */
106*4882a593Smuzhiyun #if defined(_MSC_VER)
107*4882a593Smuzhiyun #define BWL_PRE_PACKED_STRUCT
108*4882a593Smuzhiyun #define BWL_POST_PACKED_STRUCT
109*4882a593Smuzhiyun #elif defined(__GNUC__) || defined(__lint)
110*4882a593Smuzhiyun #define BWL_PRE_PACKED_STRUCT
111*4882a593Smuzhiyun #define BWL_POST_PACKED_STRUCT __attribute__ ((packed))
112*4882a593Smuzhiyun #elif defined(__CC_ARM)
113*4882a593Smuzhiyun #define BWL_PRE_PACKED_STRUCT __packed
114*4882a593Smuzhiyun #define BWL_POST_PACKED_STRUCT
115*4882a593Smuzhiyun #else
116*4882a593Smuzhiyun #error "Unknown compiler!"
117*4882a593Smuzhiyun #endif
118