xref: /openbmc/linux/include/asm-generic/export.h (revision 82003e04)
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 #ifndef KCRC_ALIGN
13 #define KCRC_ALIGN 8
14 #endif
15 #else
16 #define __put .long
17 #ifndef KSYM_ALIGN
18 #define KSYM_ALIGN 4
19 #endif
20 #ifndef KCRC_ALIGN
21 #define KCRC_ALIGN 4
22 #endif
23 #endif
24 
25 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
26 #define KSYM(name) _##name
27 #else
28 #define KSYM(name) name
29 #endif
30 
31 /*
32  * note on .section use: @progbits vs %progbits nastiness doesn't matter,
33  * since we immediately emit into those sections anyway.
34  */
35 .macro ___EXPORT_SYMBOL name,val,sec
36 #ifdef CONFIG_MODULES
37 	.globl KSYM(__ksymtab_\name)
38 	.section ___ksymtab\sec+\name,"a"
39 	.balign KSYM_ALIGN
40 KSYM(__ksymtab_\name):
41 	__put \val, KSYM(__kstrtab_\name)
42 	.previous
43 	.section __ksymtab_strings,"a"
44 KSYM(__kstrtab_\name):
45 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
46 	.asciz "_\name"
47 #else
48 	.asciz "\name"
49 #endif
50 	.previous
51 #ifdef CONFIG_MODVERSIONS
52 	.section ___kcrctab\sec+\name,"a"
53 	.balign KCRC_ALIGN
54 KSYM(__kcrctab_\name):
55 	__put KSYM(__crc_\name)
56 	.weak KSYM(__crc_\name)
57 	.previous
58 #endif
59 #endif
60 .endm
61 #undef __put
62 
63 #if defined(__KSYM_DEPS__)
64 
65 #define __EXPORT_SYMBOL(sym, val, sec)	=== __KSYM_##sym ===
66 
67 #elif defined(CONFIG_TRIM_UNUSED_KSYMS)
68 
69 #include <linux/kconfig.h>
70 #include <generated/autoksyms.h>
71 
72 #define __EXPORT_SYMBOL(sym, val, sec)				\
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(KSYM(name)),)
87 #define EXPORT_SYMBOL_GPL(name) 				\
88 	__EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)), _gpl)
89 #define EXPORT_DATA_SYMBOL(name)				\
90 	__EXPORT_SYMBOL(name, KSYM(name),)
91 #define EXPORT_DATA_SYMBOL_GPL(name)				\
92 	__EXPORT_SYMBOL(name, KSYM(name),_gpl)
93 
94 #endif
95