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
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