Linux kernel mirror (for testing)
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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_REF(sym) ".long " #sym "- ."
20#elif defined(CONFIG_64BIT)
21#define __KSYM_REF(sym) ".quad " #sym
22#else
23#define __KSYM_REF(sym) ".long " #sym
24#endif
25
26/*
27 * For every exported symbol, do the following:
28 *
29 * - Put the name of the symbol and namespace (empty string "" for none) in
30 * __ksymtab_strings.
31 * - Place a struct kernel_symbol entry in the __ksymtab section.
32 *
33 * Note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
34 * section flag requires it. Use '%progbits' instead of '@progbits' since the
35 * former apparently works on all arches according to the binutils source.
36 */
37#define __KSYMTAB(name, sym, sec, ns) \
38 asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1" "\n" \
39 "__kstrtab_" #name ":" "\n" \
40 " .asciz \"" #name "\"" "\n" \
41 "__kstrtabns_" #name ":" "\n" \
42 " .asciz \"" ns "\"" "\n" \
43 " .previous" "\n" \
44 " .section \"___ksymtab" sec "+" #name "\", \"a\"" "\n" \
45 " .balign 4" "\n" \
46 "__ksymtab_" #name ":" "\n" \
47 __KSYM_REF(sym) "\n" \
48 __KSYM_REF(__kstrtab_ ##name) "\n" \
49 __KSYM_REF(__kstrtabns_ ##name) "\n" \
50 " .previous" "\n" \
51 )
52
53#ifdef CONFIG_IA64
54#define KSYM_FUNC(name) @fptr(name)
55#else
56#define KSYM_FUNC(name) name
57#endif
58
59#define KSYMTAB_FUNC(name, sec, ns) __KSYMTAB(name, KSYM_FUNC(name), sec, ns)
60#define KSYMTAB_DATA(name, sec, ns) __KSYMTAB(name, name, sec, ns)
61
62#define SYMBOL_CRC(sym, crc, sec) \
63 asm(".section \"___kcrctab" sec "+" #sym "\",\"a\"" "\n" \
64 "__crc_" #sym ":" "\n" \
65 ".long " #crc "\n" \
66 ".previous" "\n")
67
68#endif /* __LINUX_EXPORT_INTERNAL_H__ */