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: we specify progbits since usage of the "M" (SHF_MERGE) 31 * section flag requires it. Use '%progbits' instead of '@progbits' since the 32 * former apparently works on all arches according to the binutils source. 33 */ 34 35 .macro ___EXPORT_SYMBOL name,val,sec 36 #ifdef CONFIG_MODULES 37 .section ___ksymtab\sec+\name,"a" 38 .balign KSYM_ALIGN 39 __ksymtab_\name: 40 __put \val, __kstrtab_\name 41 .previous 42 .section __ksymtab_strings,"aMS",%progbits,1 43 __kstrtab_\name: 44 .asciz "\name" 45 .previous 46 #ifdef CONFIG_MODVERSIONS 47 .section ___kcrctab\sec+\name,"a" 48 .balign KCRC_ALIGN 49 #if defined(CONFIG_MODULE_REL_CRCS) 50 .long __crc_\name - . 51 #else 52 .long __crc_\name 53 #endif 54 .weak __crc_\name 55 .previous 56 #endif 57 #endif 58 .endm 59 60 #if defined(CONFIG_TRIM_UNUSED_KSYMS) 61 62 #include <linux/kconfig.h> 63 #include <generated/autoksyms.h> 64 65 .macro __ksym_marker sym 66 .section ".discard.ksym","a" 67 __ksym_marker_\sym: 68 .previous 69 .endm 70 71 #define __EXPORT_SYMBOL(sym, val, sec) \ 72 __ksym_marker sym; \ 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(name),) 87 #define EXPORT_SYMBOL_GPL(name) \ 88 __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl) 89 #define EXPORT_DATA_SYMBOL(name) \ 90 __EXPORT_SYMBOL(name, name,) 91 #define EXPORT_DATA_SYMBOL_GPL(name) \ 92 __EXPORT_SYMBOL(name, name,_gpl) 93 94 #endif 95