1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Please do not include this explicitly.
4 * This is used by C files generated by modpost.
5 */
6
7#ifndef __LINUX_EXPORT_INTERNAL_H__
8#define __LINUX_EXPORT_INTERNAL_H__
9
10#include <linux/compiler.h>
11#include <linux/types.h>
12
13#if defined(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)
14/*
15 * relative reference: this reduces the size by half on 64-bit architectures,
16 * and eliminates the need for absolute relocations that require runtime
17 * processing on relocatable kernels.
18 */
19#define __KSYM_ALIGN		".balign 4"
20#define __KSYM_REF(sym)		".long " #sym "- ."
21#elif defined(CONFIG_64BIT)
22#define __KSYM_ALIGN		".balign 8"
23#define __KSYM_REF(sym)		".quad " #sym
24#else
25#define __KSYM_ALIGN		".balign 4"
26#define __KSYM_REF(sym)		".long " #sym
27#endif
28
29/*
30 * For every exported symbol, do the following:
31 *
32 * - Put the name of the symbol and namespace (empty string "" for none) in
33 *   __ksymtab_strings.
34 * - Place a struct kernel_symbol entry in the __ksymtab section.
35 *
36 * Note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
37 * section flag requires it. Use '%progbits' instead of '@progbits' since the
38 * former apparently works on all arches according to the binutils source.
39 */
40#define __KSYMTAB(name, sym, sec, ns)						\
41	asm("	.section \"__ksymtab_strings\",\"aMS\",%progbits,1"	"\n"	\
42	    "__kstrtab_" #name ":"					"\n"	\
43	    "	.asciz \"" #name "\""					"\n"	\
44	    "__kstrtabns_" #name ":"					"\n"	\
45	    "	.asciz \"" ns "\""					"\n"	\
46	    "	.previous"						"\n"	\
47	    "	.section \"___ksymtab" sec "+" #name "\", \"a\""	"\n"	\
48		__KSYM_ALIGN						"\n"	\
49	    "__ksymtab_" #name ":"					"\n"	\
50		__KSYM_REF(sym)						"\n"	\
51		__KSYM_REF(__kstrtab_ ##name)				"\n"	\
52		__KSYM_REF(__kstrtabns_ ##name)				"\n"	\
53	    "	.previous"						"\n"	\
54	)
55
56#if defined(CONFIG_PARISC) && defined(CONFIG_64BIT)
57#define KSYM_FUNC(name)		P%name
58#else
59#define KSYM_FUNC(name)		name
60#endif
61
62#define KSYMTAB_FUNC(name, sec, ns)	__KSYMTAB(name, KSYM_FUNC(name), sec, ns)
63#define KSYMTAB_DATA(name, sec, ns)	__KSYMTAB(name, name, sec, ns)
64
65#define SYMBOL_CRC(sym, crc, sec)   \
66	asm(".section \"___kcrctab" sec "+" #sym "\",\"a\""	"\n" \
67	    ".balign 4"						"\n" \
68	    "__crc_" #sym ":"					"\n" \
69	    ".long " #crc					"\n" \
70	    ".previous"						"\n")
71
72#endif /* __LINUX_EXPORT_INTERNAL_H__ */
73