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-rw-r--r--include/asm-generic/export.h94
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