xref: /openbmc/linux/include/asm-generic/export.h (revision 4da722ca)
1 #ifndef __ASM_GENERIC_EXPORT_H
2 #define __ASM_GENERIC_EXPORT_H
3 
4 #ifndef KSYM_FUNC
5 #define KSYM_FUNC(x) x
6 #endif
7 #ifdef CONFIG_64BIT
8 #define __put .quad
9 #ifndef KSYM_ALIGN
10 #define KSYM_ALIGN 8
11 #endif
12 #else
13 #define __put .long
14 #ifndef KSYM_ALIGN
15 #define KSYM_ALIGN 4
16 #endif
17 #endif
18 #ifndef KCRC_ALIGN
19 #define KCRC_ALIGN 4
20 #endif
21 
22 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
23 #define KSYM(name) _##name
24 #else
25 #define KSYM(name) name
26 #endif
27 
28 /*
29  * note on .section use: @progbits vs %progbits nastiness doesn't matter,
30  * since we immediately emit into those sections anyway.
31  */
32 .macro ___EXPORT_SYMBOL name,val,sec
33 #ifdef CONFIG_MODULES
34 	.globl KSYM(__ksymtab_\name)
35 	.section ___ksymtab\sec+\name,"a"
36 	.balign KSYM_ALIGN
37 KSYM(__ksymtab_\name):
38 	__put \val, KSYM(__kstrtab_\name)
39 	.previous
40 	.section __ksymtab_strings,"a"
41 KSYM(__kstrtab_\name):
42 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
43 	.asciz "_\name"
44 #else
45 	.asciz "\name"
46 #endif
47 	.previous
48 #ifdef CONFIG_MODVERSIONS
49 	.section ___kcrctab\sec+\name,"a"
50 	.balign KCRC_ALIGN
51 KSYM(__kcrctab_\name):
52 #if defined(CONFIG_MODULE_REL_CRCS)
53 	.long KSYM(__crc_\name) - .
54 #else
55 	.long KSYM(__crc_\name)
56 #endif
57 	.weak KSYM(__crc_\name)
58 	.previous
59 #endif
60 #endif
61 .endm
62 #undef __put
63 
64 #if defined(__KSYM_DEPS__)
65 
66 #define __EXPORT_SYMBOL(sym, val, sec)	=== __KSYM_##sym ===
67 
68 #elif defined(CONFIG_TRIM_UNUSED_KSYMS)
69 
70 #include <linux/kconfig.h>
71 #include <generated/autoksyms.h>
72 
73 #define __EXPORT_SYMBOL(sym, val, sec)				\
74 	__cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
75 #define __cond_export_sym(sym, val, sec, conf)			\
76 	___cond_export_sym(sym, val, sec, conf)
77 #define ___cond_export_sym(sym, val, sec, enabled)		\
78 	__cond_export_sym_##enabled(sym, val, sec)
79 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
80 #define __cond_export_sym_0(sym, val, sec) /* nothing */
81 
82 #else
83 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
84 #endif
85 
86 #define EXPORT_SYMBOL(name)					\
87 	__EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)),)
88 #define EXPORT_SYMBOL_GPL(name) 				\
89 	__EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)), _gpl)
90 #define EXPORT_DATA_SYMBOL(name)				\
91 	__EXPORT_SYMBOL(name, KSYM(name),)
92 #define EXPORT_DATA_SYMBOL_GPL(name)				\
93 	__EXPORT_SYMBOL(name, KSYM(name),_gpl)
94 
95 #endif
96