Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2#ifndef __ASM_GENERIC_EXPORT_H
3#define __ASM_GENERIC_EXPORT_H
4
5#ifndef KSYM_FUNC
6#define KSYM_FUNC(x) x
7#endif
8#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
9#define KSYM_ALIGN 4
10#elif defined(CONFIG_64BIT)
11#define KSYM_ALIGN 8
12#else
13#define KSYM_ALIGN 4
14#endif
15#ifndef KCRC_ALIGN
16#define KCRC_ALIGN 4
17#endif
18
19.macro __put, val, name
20#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
21 .long \val - ., \name - ., 0
22#elif defined(CONFIG_64BIT)
23 .quad \val, \name, 0
24#else
25 .long \val, \name, 0
26#endif
27.endm
28
29/*
30 * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
31 * section flag requires it. Use '%progbits' instead of '@progbits' since the
32 * former apparently works on all arches according to the binutils source.
33 */
34
35.macro ___EXPORT_SYMBOL name,val,sec
36#ifdef CONFIG_MODULES
37 .section ___ksymtab\sec+\name,"a"
38 .balign KSYM_ALIGN
39__ksymtab_\name:
40 __put \val, __kstrtab_\name
41 .previous
42 .section __ksymtab_strings,"aMS",%progbits,1
43__kstrtab_\name:
44 .asciz "\name"
45 .previous
46#ifdef CONFIG_MODVERSIONS
47 .section ___kcrctab\sec+\name,"a"
48 .balign KCRC_ALIGN
49#if defined(CONFIG_MODULE_REL_CRCS)
50 .long __crc_\name - .
51#else
52 .long __crc_\name
53#endif
54 .weak __crc_\name
55 .previous
56#endif
57#endif
58.endm
59
60#if defined(CONFIG_TRIM_UNUSED_KSYMS)
61
62#include <linux/kconfig.h>
63#include <generated/autoksyms.h>
64
65.macro __ksym_marker sym
66 .section ".discard.ksym","a"
67__ksym_marker_\sym:
68 .previous
69.endm
70
71#define __EXPORT_SYMBOL(sym, val, sec) \
72 __ksym_marker sym; \
73 __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
74#define __cond_export_sym(sym, val, sec, conf) \
75 ___cond_export_sym(sym, val, sec, conf)
76#define ___cond_export_sym(sym, val, sec, enabled) \
77 __cond_export_sym_##enabled(sym, val, sec)
78#define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
79#define __cond_export_sym_0(sym, val, sec) /* nothing */
80
81#else
82#define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
83#endif
84
85#define EXPORT_SYMBOL(name) \
86 __EXPORT_SYMBOL(name, KSYM_FUNC(name),)
87#define EXPORT_SYMBOL_GPL(name) \
88 __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
89#define EXPORT_DATA_SYMBOL(name) \
90 __EXPORT_SYMBOL(name, name,)
91#define EXPORT_DATA_SYMBOL_GPL(name) \
92 __EXPORT_SYMBOL(name, name,_gpl)
93
94#endif