1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 #ifndef __ASM_GENERIC_EXPORT_H 3 #define __ASM_GENERIC_EXPORT_H 4 5 #ifndef KSYM_FUNC 6 #define KSYM_FUNC(x) x 7 #endif 8 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS 9 #define KSYM_ALIGN 4 10 #elif defined(CONFIG_64BIT) 11 #define KSYM_ALIGN 8 12 #else 13 #define KSYM_ALIGN 4 14 #endif 15 #ifndef KCRC_ALIGN 16 #define KCRC_ALIGN 4 17 #endif 18 19 .macro __put, val, name 20 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS 21 .long \val - ., \name - ., 0 22 #elif defined(CONFIG_64BIT) 23 .quad \val, \name, 0 24 #else 25 .long \val, \name, 0 26 #endif 27 .endm 28 29 /* 30 * note on .section use: @progbits vs %progbits nastiness doesn't matter, 31 * since we immediately emit into those sections anyway. 32 */ 33 .macro ___EXPORT_SYMBOL name,val,sec 34 #ifdef CONFIG_MODULES 35 .section ___ksymtab\sec+\name,"a" 36 .balign KSYM_ALIGN 37 __ksymtab_\name: 38 __put \val, __kstrtab_\name 39 .previous 40 .section __ksymtab_strings,"a" 41 __kstrtab_\name: 42 .asciz "\name" 43 .previous 44 #ifdef CONFIG_MODVERSIONS 45 .section ___kcrctab\sec+\name,"a" 46 .balign KCRC_ALIGN 47 #if defined(CONFIG_MODULE_REL_CRCS) 48 .long __crc_\name - . 49 #else 50 .long __crc_\name 51 #endif 52 .weak __crc_\name 53 .previous 54 #endif 55 #endif 56 .endm 57 58 #if defined(CONFIG_TRIM_UNUSED_KSYMS) 59 60 #include <linux/kconfig.h> 61 #include <generated/autoksyms.h> 62 63 .macro __ksym_marker sym 64 .section ".discard.ksym","a" 65 __ksym_marker_\sym: 66 .previous 67 .endm 68 69 #define __EXPORT_SYMBOL(sym, val, sec) \ 70 __ksym_marker sym; \ 71 __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym)) 72 #define __cond_export_sym(sym, val, sec, conf) \ 73 ___cond_export_sym(sym, val, sec, conf) 74 #define ___cond_export_sym(sym, val, sec, enabled) \ 75 __cond_export_sym_##enabled(sym, val, sec) 76 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec 77 #define __cond_export_sym_0(sym, val, sec) /* nothing */ 78 79 #else 80 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec 81 #endif 82 83 #define EXPORT_SYMBOL(name) \ 84 __EXPORT_SYMBOL(name, KSYM_FUNC(name),) 85 #define EXPORT_SYMBOL_GPL(name) \ 86 __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl) 87 #define EXPORT_DATA_SYMBOL(name) \ 88 __EXPORT_SYMBOL(name, name,) 89 #define EXPORT_DATA_SYMBOL_GPL(name) \ 90 __EXPORT_SYMBOL(name, name,_gpl) 91 92 #endif 93