1 files changed, 94 insertions, 0 deletions
diff --git a/include/asm-generic/export.h b/include/asm-generic/export.h
new file mode 100644
index 000000000..365345f9a
--- /dev/null
+++ b/include/asm-generic/export.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_GENERIC_EXPORT_H
+#define __ASM_GENERIC_EXPORT_H
+
+#ifndef KSYM_FUNC
+#define KSYM_FUNC(x) x
+#endif
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+#define KSYM_ALIGN 4
+#elif defined(CONFIG_64BIT)
+#define KSYM_ALIGN 8
+#else
+#define KSYM_ALIGN 4
+#endif
+#ifndef KCRC_ALIGN
+#define KCRC_ALIGN 4
+#endif
+
+.macro __put, val, name
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+	.long	\val - ., \name - ., 0
+#elif defined(CONFIG_64BIT)
+	.quad	\val, \name, 0
+#else
+	.long	\val, \name, 0
+#endif
+.endm
+
+/*
+ * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
+ * section flag requires it. Use '%progbits' instead of '@progbits' since the
+ * former apparently works on all arches according to the binutils source.
+ */
+
+.macro ___EXPORT_SYMBOL name,val,sec
+#ifdef CONFIG_MODULES
+	.section ___ksymtab\sec+\name,"a"
+	.balign KSYM_ALIGN
+__ksymtab_\name:
+	__put \val, __kstrtab_\name
+	.previous
+	.section __ksymtab_strings,"aMS",%progbits,1
+__kstrtab_\name:
+	.asciz "\name"
+	.previous
+#ifdef CONFIG_MODVERSIONS
+	.section ___kcrctab\sec+\name,"a"
+	.balign KCRC_ALIGN
+#if defined(CONFIG_MODULE_REL_CRCS)
+	.long __crc_\name - .
+#else
+	.long __crc_\name
+#endif
+	.weak __crc_\name
+	.previous
+#endif
+#endif
+.endm
+
+#if defined(CONFIG_TRIM_UNUSED_KSYMS)
+
+#include <linux/kconfig.h>
+#include <generated/autoksyms.h>
+
+.macro __ksym_marker sym
+	.section ".discard.ksym","a"
+__ksym_marker_\sym:
+	 .previous
+.endm
+
+#define __EXPORT_SYMBOL(sym, val, sec)				\
+	__ksym_marker sym;					\
+	__cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
+#define __cond_export_sym(sym, val, sec, conf)			\
+	___cond_export_sym(sym, val, sec, conf)
+#define ___cond_export_sym(sym, val, sec, enabled)		\
+	__cond_export_sym_##enabled(sym, val, sec)
+#define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
+#define __cond_export_sym_0(sym, val, sec) /* nothing */
+
+#else
+#define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
+#endif
+
+#define EXPORT_SYMBOL(name)					\
+	__EXPORT_SYMBOL(name, KSYM_FUNC(name),)
+#define EXPORT_SYMBOL_GPL(name) 				\
+	__EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
+#define EXPORT_DATA_SYMBOL(name)				\
+	__EXPORT_SYMBOL(name, name,)
+#define EXPORT_DATA_SYMBOL_GPL(name)				\
+	__EXPORT_SYMBOL(name, name,_gpl)
+
+#endif