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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/include/linux/export.h
....@@ -1,3 +1,4 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 #ifndef _LINUX_EXPORT_H
23 #define _LINUX_EXPORT_H
34 
....@@ -18,9 +19,6 @@
1819 #define THIS_MODULE ((struct module *)0)
1920 #endif
2021 
21
-#ifdef CONFIG_MODULES
22
-
23
-#if defined(__KERNEL__) && !defined(__GENKSYMS__)
2422 #ifdef CONFIG_MODVERSIONS
2523 /* Mark the CRC weak since genksyms apparently decides not to
2624  * generate a checksums for some symbols */
....@@ -29,13 +27,13 @@
2927 	asm("	.section \"___kcrctab" sec "+" #sym "\", \"a\"	\n"	\
3028 	    "	.weak	__crc_" #sym "				\n"	\
3129 	    "	.long	__crc_" #sym " - .			\n"	\
32
-	    "	.previous					\n");
30
+	    "	.previous					\n")
3331 #else
3432 #define __CRC_SYMBOL(sym, sec)						\
3533 	asm("	.section \"___kcrctab" sec "+" #sym "\", \"a\"	\n"	\
3634 	    "	.weak	__crc_" #sym "				\n"	\
3735 	    "	.long	__crc_" #sym "				\n"	\
38
-	    "	.previous					\n");
36
+	    "	.previous					\n")
3937 #endif
4038 #else
4139 #define __CRC_SYMBOL(sym, sec)
....@@ -52,102 +50,159 @@
5250 #define __KSYMTAB_ENTRY(sym, sec)					\
5351 	__ADDRESSABLE(sym)						\
5452 	asm("	.section \"___ksymtab" sec "+" #sym "\", \"a\"	\n"	\
55
-	    "	.balign	8					\n"	\
53
+	    "	.balign	4					\n"	\
5654 	    "__ksymtab_" #sym ":				\n"	\
5755 	    "	.long	" #sym "- .				\n"	\
5856 	    "	.long	__kstrtab_" #sym "- .			\n"	\
57
+	    "	.long	__kstrtabns_" #sym "- .			\n"	\
5958 	    "	.previous					\n")
6059 
6160 struct kernel_symbol {
6261 	int value_offset;
6362 	int name_offset;
63
+	int namespace_offset;
6464 };
6565 #else
66
+#ifdef CONFIG_CFI_CLANG
67
+#include <linux/compiler.h>
68
+/*
69
+ * With -fno-sanitize-cfi-canonical-jump-tables, the compiler replaces
70
+ * references to functions with jump table addresses. Use inline assembly
71
+ * to emit ksymtab entries that point to the actual function instead.
72
+ */
73
+#define ___KSYMTAB_ENTRY(sym, sec, size)				\
74
+	__ADDRESSABLE(sym)						\
75
+	asm("	.section \"___ksymtab" sec "+" #sym "\", \"a\"	\n"	\
76
+	    "	.balign " #size "				\n"	\
77
+	    "__ksymtab_" #sym ":				\n"	\
78
+	    "	." #size "byte	" #sym "			\n"	\
79
+	    "	." #size "byte	__kstrtab_" #sym "		\n"	\
80
+	    "	." #size "byte	__kstrtabns_" #sym "		\n"	\
81
+	    "	.previous					\n")
82
+
83
+#ifdef CONFIG_64BIT
84
+#define __KSYMTAB_ENTRY(sym, sec)	___KSYMTAB_ENTRY(sym, sec, 8)
85
+#else
86
+#define __KSYMTAB_ENTRY(sym, sec)	___KSYMTAB_ENTRY(sym, sec, 4)
87
+#endif
88
+
89
+#else /* !CONFIG_CFI_CLANG */
90
+
6691 #define __KSYMTAB_ENTRY(sym, sec)					\
6792 	static const struct kernel_symbol __ksymtab_##sym		\
6893 	__attribute__((section("___ksymtab" sec "+" #sym), used))	\
69
-	= { (unsigned long)&sym, __kstrtab_##sym }
94
+	__aligned(sizeof(void *))					\
95
+	= { (unsigned long)&sym, __kstrtab_##sym, __kstrtabns_##sym }
96
+
97
+#endif
7098 
7199 struct kernel_symbol {
72100 	unsigned long value;
73101 	const char *name;
102
+	const char *namespace;
74103 };
75104 #endif
76105 
77
-/* For every exported symbol, place a struct in the __ksymtab section */
78
-#define ___EXPORT_SYMBOL(sym, sec)					\
79
-	extern typeof(sym) sym;						\
80
-	__CRC_SYMBOL(sym, sec)						\
81
-	static const char __kstrtab_##sym[]				\
82
-	__attribute__((section("__ksymtab_strings"), used, aligned(1)))	\
83
-	= #sym;								\
106
+#ifdef __GENKSYMS__
107
+
108
+#define ___EXPORT_SYMBOL(sym, sec, ns)	__GENKSYMS_EXPORT_SYMBOL(sym)
109
+
110
+#else
111
+
112
+/*
113
+ * For every exported symbol, do the following:
114
+ *
115
+ * - If applicable, place a CRC entry in the __kcrctab section.
116
+ * - Put the name of the symbol and namespace (empty string "" for none) in
117
+ *   __ksymtab_strings.
118
+ * - Place a struct kernel_symbol entry in the __ksymtab section.
119
+ *
120
+ * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
121
+ * section flag requires it. Use '%progbits' instead of '@progbits' since the
122
+ * former apparently works on all arches according to the binutils source.
123
+ */
124
+#define ___EXPORT_SYMBOL(sym, sec, ns)						\
125
+	extern typeof(sym) sym;							\
126
+	extern const char __kstrtab_##sym[];					\
127
+	extern const char __kstrtabns_##sym[];					\
128
+	__CRC_SYMBOL(sym, sec);							\
129
+	asm("	.section \"__ksymtab_strings\",\"aMS\",%progbits,1	\n"	\
130
+	    "__kstrtab_" #sym ":					\n"	\
131
+	    "	.asciz 	\"" #sym "\"					\n"	\
132
+	    "__kstrtabns_" #sym ":					\n"	\
133
+	    "	.asciz 	\"" ns "\"					\n"	\
134
+	    "	.previous						\n");	\
84135 	__KSYMTAB_ENTRY(sym, sec)
85136 
86
-#if defined(__DISABLE_EXPORTS)
137
+#endif
138
+
139
+#if !defined(CONFIG_MODULES) || defined(__DISABLE_EXPORTS)
87140 
88141 /*
89142  * Allow symbol exports to be disabled completely so that C code may
90143  * be reused in other execution contexts such as the UEFI stub or the
91144  * decompressor.
92145  */
93
-#define __EXPORT_SYMBOL(sym, sec)
94
-
95
-#elif defined(__KSYM_DEPS__)
96
-
97
-/*
98
- * For fine grained build dependencies, we want to tell the build system
99
- * about each possible exported symbol even if they're not actually exported.
100
- * We use a string pattern that is unlikely to be valid code that the build
101
- * system filters out from the preprocessor output (see ksym_dep_filter
102
- * in scripts/Kbuild.include).
103
- */
104
-#define __EXPORT_SYMBOL(sym, sec)	=== __KSYM_##sym ===
146
+#define __EXPORT_SYMBOL(sym, sec, ns)
105147 
106148 #elif defined(CONFIG_TRIM_UNUSED_KSYMS) && !defined(MODULE)
107149 
108150 #include <generated/autoksyms.h>
109151 
110
-#define __EXPORT_SYMBOL(sym, sec)				\
111
-	__cond_export_sym(sym, sec, __is_defined(__KSYM_##sym))
112
-#define __cond_export_sym(sym, sec, conf)			\
113
-	___cond_export_sym(sym, sec, conf)
114
-#define ___cond_export_sym(sym, sec, enabled)			\
115
-	__cond_export_sym_##enabled(sym, sec)
116
-#define __cond_export_sym_1(sym, sec) ___EXPORT_SYMBOL(sym, sec)
117
-#define __cond_export_sym_0(sym, sec) /* nothing */
152
+/*
153
+ * For fine grained build dependencies, we want to tell the build system
154
+ * about each possible exported symbol even if they're not actually exported.
155
+ * We use a symbol pattern __ksym_marker_<symbol> that the build system filters
156
+ * from the $(NM) output (see scripts/gen_ksymdeps.sh). These symbols are
157
+ * discarded in the final link stage.
158
+ */
159
+#define __ksym_marker(sym)	\
160
+	static int __ksym_marker_##sym[0] __section(".discard.ksym") __used
118161 
162
+#define __EXPORT_SYMBOL(sym, sec, ns)					\
163
+	__ksym_marker(sym);						\
164
+	__cond_export_sym(sym, sec, ns, __is_defined(__KSYM_##sym))
165
+#define __cond_export_sym(sym, sec, ns, conf)				\
166
+	___cond_export_sym(sym, sec, ns, conf)
167
+#define ___cond_export_sym(sym, sec, ns, enabled)			\
168
+	__cond_export_sym_##enabled(sym, sec, ns)
169
+#define __cond_export_sym_1(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns)
170
+
171
+#ifdef __GENKSYMS__
172
+#define __cond_export_sym_0(sym, sec, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
119173 #else
120
-#define __EXPORT_SYMBOL ___EXPORT_SYMBOL
174
+#define __cond_export_sym_0(sym, sec, ns) /* nothing */
121175 #endif
122176 
123
-#define EXPORT_SYMBOL(sym)					\
124
-	__EXPORT_SYMBOL(sym, "")
125
-
126
-#define EXPORT_SYMBOL_GPL(sym)					\
127
-	__EXPORT_SYMBOL(sym, "_gpl")
128
-
129
-#define EXPORT_SYMBOL_GPL_FUTURE(sym)				\
130
-	__EXPORT_SYMBOL(sym, "_gpl_future")
131
-
132
-#ifdef CONFIG_UNUSED_SYMBOLS
133
-#define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
134
-#define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
135177 #else
136
-#define EXPORT_UNUSED_SYMBOL(sym)
137
-#define EXPORT_UNUSED_SYMBOL_GPL(sym)
138
-#endif
139178 
140
-#endif	/* __GENKSYMS__ */
141
-
142
-#else /* !CONFIG_MODULES... */
143
-
144
-#define EXPORT_SYMBOL(sym)
145
-#define EXPORT_SYMBOL_GPL(sym)
146
-#define EXPORT_SYMBOL_GPL_FUTURE(sym)
147
-#define EXPORT_UNUSED_SYMBOL(sym)
148
-#define EXPORT_UNUSED_SYMBOL_GPL(sym)
179
+#define __EXPORT_SYMBOL(sym, sec, ns)	___EXPORT_SYMBOL(sym, sec, ns)
149180 
150181 #endif /* CONFIG_MODULES */
182
+
183
+#ifdef DEFAULT_SYMBOL_NAMESPACE
184
+#include <linux/stringify.h>
185
+#define _EXPORT_SYMBOL(sym, sec)	__EXPORT_SYMBOL(sym, sec, __stringify(DEFAULT_SYMBOL_NAMESPACE))
186
+#else
187
+#define _EXPORT_SYMBOL(sym, sec)	__EXPORT_SYMBOL(sym, sec, "")
188
+#endif
189
+
190
+#define EXPORT_SYMBOL(sym)		_EXPORT_SYMBOL(sym, "")
191
+#define EXPORT_SYMBOL_GPL(sym)		_EXPORT_SYMBOL(sym, "_gpl")
192
+#define EXPORT_SYMBOL_GPL_FUTURE(sym)	_EXPORT_SYMBOL(sym, "_gpl_future")
193
+#define _EXPORT_SYMBOL_NS(sym, ns)	__EXPORT_SYMBOL(sym, "", #ns)
194
+#define _EXPORT_SYMBOL_NS_GPL(sym, ns)	__EXPORT_SYMBOL(sym, "_gpl", #ns)
195
+#define EXPORT_SYMBOL_NS(sym, ns)	_EXPORT_SYMBOL_NS(sym, ns)
196
+#define EXPORT_SYMBOL_NS_GPL(sym, ns)	_EXPORT_SYMBOL_NS_GPL(sym, ns)
197
+
198
+#ifdef CONFIG_UNUSED_SYMBOLS
199
+#define EXPORT_UNUSED_SYMBOL(sym)	_EXPORT_SYMBOL(sym, "_unused")
200
+#define EXPORT_UNUSED_SYMBOL_GPL(sym)	_EXPORT_SYMBOL(sym, "_unused_gpl")
201
+#else
202
+#define EXPORT_UNUSED_SYMBOL(sym)
203
+#define EXPORT_UNUSED_SYMBOL_GPL(sym)
204
+#endif
205
+
151206 #endif /* !__ASSEMBLY__ */
152207 
153208 #endif /* _LINUX_EXPORT_H */