1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 #ifndef __ASM_GENERIC_EXPORT_H 3 #define __ASM_GENERIC_EXPORT_H 4 5 /* 6 * This comment block is used by fixdep. Please do not remove. 7 * 8 * When CONFIG_MODVERSIONS is changed from n to y, all source files having 9 * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a 10 * side effect of the *.o build rule. 11 */ 12 13 #ifndef KSYM_FUNC 14 #define KSYM_FUNC(x) x 15 #endif 16 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS 17 #define KSYM_ALIGN 4 18 #elif defined(CONFIG_64BIT) 19 #define KSYM_ALIGN 8 20 #else 21 #define KSYM_ALIGN 4 22 #endif 23 24 .macro __put, val, name 25 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS 26 .long \val - ., \name - ., 0 27 #elif defined(CONFIG_64BIT) 28 .quad \val, \name, 0 29 #else 30 .long \val, \name, 0 31 #endif 32 .endm 33 34 /* 35 * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE) 36 * section flag requires it. Use '%progbits' instead of '@progbits' since the 37 * former apparently works on all arches according to the binutils source. 38 */ 39 40 .macro ___EXPORT_SYMBOL name,val,sec 41 #if defined(CONFIG_MODULES) && !defined(__DISABLE_EXPORTS) 42 .section ___ksymtab\sec+\name,"a" 43 .balign KSYM_ALIGN 44 __ksymtab_\name: 45 __put \val, __kstrtab_\name 46 .previous 47 .section __ksymtab_strings,"aMS",%progbits,1 48 __kstrtab_\name: 49 .asciz "\name" 50 .previous 51 #endif 52 .endm 53 54 #if defined(CONFIG_TRIM_UNUSED_KSYMS) 55 56 #include <linux/kconfig.h> 57 #include <generated/autoksyms.h> 58 59 .macro __ksym_marker sym 60 .section ".discard.ksym","a" 61 __ksym_marker_\sym: 62 .previous 63 .endm 64 65 #define __EXPORT_SYMBOL(sym, val, sec) \ 66 __ksym_marker sym; \ 67 __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym)) 68 #define __cond_export_sym(sym, val, sec, conf) \ 69 ___cond_export_sym(sym, val, sec, conf) 70 #define ___cond_export_sym(sym, val, sec, enabled) \ 71 __cond_export_sym_##enabled(sym, val, sec) 72 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec 73 #define __cond_export_sym_0(sym, val, sec) /* nothing */ 74 75 #else 76 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec 77 #endif 78 79 #define EXPORT_SYMBOL(name) \ 80 __EXPORT_SYMBOL(name, KSYM_FUNC(name),) 81 #define EXPORT_SYMBOL_GPL(name) \ 82 __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl) 83 #define EXPORT_DATA_SYMBOL(name) \ 84 __EXPORT_SYMBOL(name, name,) 85 #define EXPORT_DATA_SYMBOL_GPL(name) \ 86 __EXPORT_SYMBOL(name, name,_gpl) 87 88 #endif 89