1
2#ifndef _LINUX_EXPORT_H
3#define _LINUX_EXPORT_H
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12
13
14#ifndef __ASSEMBLY__
15#ifdef MODULE
16extern struct module __this_module;
17#define THIS_MODULE (&__this_module)
18#else
19#define THIS_MODULE ((struct module *)0)
20#endif
21
22#ifdef CONFIG_MODVERSIONS
23
24
25#if defined(CONFIG_MODULE_REL_CRCS)
26#define __CRC_SYMBOL(sym, sec) \
27 asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \
28 " .weak __crc_" #sym " \n" \
29 " .long __crc_" #sym " - . \n" \
30 " .previous \n")
31#else
32#define __CRC_SYMBOL(sym, sec) \
33 asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \
34 " .weak __crc_" #sym " \n" \
35 " .long __crc_" #sym " \n" \
36 " .previous \n")
37#endif
38#else
39#define __CRC_SYMBOL(sym, sec)
40#endif
41
42#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
43#include <linux/compiler.h>
44
45
46
47
48
49
50#define __KSYMTAB_ENTRY(sym, sec) \
51 __ADDRESSABLE(sym) \
52 asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \
53 " .balign 4 \n" \
54 "__ksymtab_" #sym ": \n" \
55 " .long " #sym "- . \n" \
56 " .long __kstrtab_" #sym "- . \n" \
57 " .long __kstrtabns_" #sym "- . \n" \
58 " .previous \n")
59
60struct kernel_symbol {
61 int value_offset;
62 int name_offset;
63 int namespace_offset;
64};
65#else
66#define __KSYMTAB_ENTRY(sym, sec) \
67 static const struct kernel_symbol __ksymtab_##sym \
68 __attribute__((section("___ksymtab" sec "+" #sym), used)) \
69 __aligned(sizeof(void *)) \
70 = { (unsigned long)&sym, __kstrtab_##sym, __kstrtabns_##sym }
71
72struct kernel_symbol {
73 unsigned long value;
74 const char *name;
75 const char *namespace;
76};
77#endif
78
79#ifdef __GENKSYMS__
80
81#define ___EXPORT_SYMBOL(sym, sec, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
82
83#else
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96
97#define ___EXPORT_SYMBOL(sym, sec, ns) \
98 extern typeof(sym) sym; \
99 extern const char __kstrtab_##sym[]; \
100 extern const char __kstrtabns_##sym[]; \
101 __CRC_SYMBOL(sym, sec); \
102 asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1 \n" \
103 "__kstrtab_" #sym ": \n" \
104 " .asciz \"" #sym "\" \n" \
105 "__kstrtabns_" #sym ": \n" \
106 " .asciz \"" ns "\" \n" \
107 " .previous \n"); \
108 __KSYMTAB_ENTRY(sym, sec)
109
110#endif
111
112#if !defined(CONFIG_MODULES) || defined(__DISABLE_EXPORTS)
113
114
115
116
117
118
119#define __EXPORT_SYMBOL(sym, sec, ns)
120
121#elif defined(CONFIG_TRIM_UNUSED_KSYMS)
122
123#include <generated/autoksyms.h>
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129
130
131
132#define __ksym_marker(sym) \
133 static int __ksym_marker_##sym[0] __section(".discard.ksym") __used
134
135#define __EXPORT_SYMBOL(sym, sec, ns) \
136 __ksym_marker(sym); \
137 __cond_export_sym(sym, sec, ns, __is_defined(__KSYM_##sym))
138#define __cond_export_sym(sym, sec, ns, conf) \
139 ___cond_export_sym(sym, sec, ns, conf)
140#define ___cond_export_sym(sym, sec, ns, enabled) \
141 __cond_export_sym_##enabled(sym, sec, ns)
142#define __cond_export_sym_1(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns)
143#define __cond_export_sym_0(sym, sec, ns)
144
145#else
146
147#define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns)
148
149#endif
150
151#ifdef DEFAULT_SYMBOL_NAMESPACE
152#include <linux/stringify.h>
153#define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, __stringify(DEFAULT_SYMBOL_NAMESPACE))
154#else
155#define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "")
156#endif
157
158#define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "")
159#define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl")
160#define EXPORT_SYMBOL_GPL_FUTURE(sym) _EXPORT_SYMBOL(sym, "_gpl_future")
161#define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", #ns)
162#define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "_gpl", #ns)
163
164#ifdef CONFIG_UNUSED_SYMBOLS
165#define EXPORT_UNUSED_SYMBOL(sym) _EXPORT_SYMBOL(sym, "_unused")
166#define EXPORT_UNUSED_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_unused_gpl")
167#else
168#define EXPORT_UNUSED_SYMBOL(sym)
169#define EXPORT_UNUSED_SYMBOL_GPL(sym)
170#endif
171
172#endif
173
174#endif
175