1/* SPDX-License-Identifier: GPL-2.0-only */
 2#ifndef __ASM_GENERIC_EXPORT_H
 3#define __ASM_GENERIC_EXPORT_H
 4
 5/*
 6 * This comment block is used by fixdep. Please do not remove.
 7 *
 8 * When CONFIG_MODVERSIONS is changed from n to y, all source files having
 9 * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
10 * side effect of the *.o build rule.
11 */
12
13#ifndef KSYM_FUNC
14#define KSYM_FUNC(x) x
15#endif
16#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
17#define KSYM_ALIGN 4
18#elif defined(CONFIG_64BIT)
19#define KSYM_ALIGN 8
20#else
21#define KSYM_ALIGN 4
22#endif
23
24.macro __put, val, name
25#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
26	.long	\val - ., \name - ., 0
27#elif defined(CONFIG_64BIT)
28	.quad	\val, \name, 0
29#else
30	.long	\val, \name, 0
31#endif
32.endm
33
34/*
35 * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
36 * section flag requires it. Use '%progbits' instead of '@progbits' since the
37 * former apparently works on all arches according to the binutils source.
38 */
39
40.macro ___EXPORT_SYMBOL name,val,sec
41#if defined(CONFIG_MODULES) && !defined(__DISABLE_EXPORTS)
42	.section ___ksymtab\sec+\name,"a"
43	.balign KSYM_ALIGN
44__ksymtab_\name:
45	__put \val, __kstrtab_\name
46	.previous
47	.section __ksymtab_strings,"aMS",%progbits,1
48__kstrtab_\name:
49	.asciz "\name"
50	.previous
51#endif
52.endm
53
54#if defined(CONFIG_TRIM_UNUSED_KSYMS)
55
56#include <linux/kconfig.h>
57#include <generated/autoksyms.h>
58
59.macro __ksym_marker sym
60	.section ".discard.ksym","a"
61__ksym_marker_\sym:
62	 .previous
63.endm
64
65#define __EXPORT_SYMBOL(sym, val, sec)				\
66	__ksym_marker sym;					\
67	__cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
68#define __cond_export_sym(sym, val, sec, conf)			\
69	___cond_export_sym(sym, val, sec, conf)
70#define ___cond_export_sym(sym, val, sec, enabled)		\
71	__cond_export_sym_##enabled(sym, val, sec)
72#define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
73#define __cond_export_sym_0(sym, val, sec) /* nothing */
74
75#else
76#define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
77#endif
78
79#define EXPORT_SYMBOL(name)					\
80	__EXPORT_SYMBOL(name, KSYM_FUNC(name),)
81#define EXPORT_SYMBOL_GPL(name) 				\
82	__EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
83#define EXPORT_DATA_SYMBOL(name)				\
84	__EXPORT_SYMBOL(name, name,)
85#define EXPORT_DATA_SYMBOL_GPL(name)				\
86	__EXPORT_SYMBOL(name, name,_gpl)
87
88#endif