1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Please do not include this explicitly. 4 * This is used by C files generated by modpost. 5 */ 6 7 #ifndef __LINUX_EXPORT_INTERNAL_H__ 8 #define __LINUX_EXPORT_INTERNAL_H__ 9 10 #include <linux/compiler.h> 11 #include <linux/types.h> 12 13 #if defined(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS) 14 /* 15 * relative reference: this reduces the size by half on 64-bit architectures, 16 * and eliminates the need for absolute relocations that require runtime 17 * processing on relocatable kernels. 18 */ 19 #define __KSYM_ALIGN ".balign 4" 20 #define __KSYM_REF(sym) ".long " #sym "- ." 21 #elif defined(CONFIG_64BIT) 22 #define __KSYM_ALIGN ".balign 8" 23 #define __KSYM_REF(sym) ".quad " #sym 24 #else 25 #define __KSYM_ALIGN ".balign 4" 26 #define __KSYM_REF(sym) ".long " #sym 27 #endif 28 29 /* 30 * For every exported symbol, do the following: 31 * 32 * - Put the name of the symbol and namespace (empty string "" for none) in 33 * __ksymtab_strings. 34 * - Place a struct kernel_symbol entry in the __ksymtab section. 35 * 36 * Note on .section use: we specify progbits since usage of the "M" (SHF_MERGE) 37 * section flag requires it. Use '%progbits' instead of '@progbits' since the 38 * former apparently works on all arches according to the binutils source. 39 */ 40 #define __KSYMTAB(name, sym, sec, ns) \ 41 asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1" "\n" \ 42 "__kstrtab_" #name ":" "\n" \ 43 " .asciz \"" #name "\"" "\n" \ 44 "__kstrtabns_" #name ":" "\n" \ 45 " .asciz \"" ns "\"" "\n" \ 46 " .previous" "\n" \ 47 " .section \"___ksymtab" sec "+" #name "\", \"a\"" "\n" \ 48 __KSYM_ALIGN "\n" \ 49 "__ksymtab_" #name ":" "\n" \ 50 __KSYM_REF(sym) "\n" \ 51 __KSYM_REF(__kstrtab_ ##name) "\n" \ 52 __KSYM_REF(__kstrtabns_ ##name) "\n" \ 53 " .previous" "\n" \ 54 ) 55 56 #ifdef CONFIG_IA64 57 #define KSYM_FUNC(name) @fptr(name) 58 #elif defined(CONFIG_PARISC) && defined(CONFIG_64BIT) 59 #define KSYM_FUNC(name) P%name 60 #else 61 #define KSYM_FUNC(name) name 62 #endif 63 64 #define KSYMTAB_FUNC(name, sec, ns) __KSYMTAB(name, KSYM_FUNC(name), sec, ns) 65 #define KSYMTAB_DATA(name, sec, ns) __KSYMTAB(name, name, sec, ns) 66 67 #define SYMBOL_CRC(sym, crc, sec) \ 68 asm(".section \"___kcrctab" sec "+" #sym "\",\"a\"" "\n" \ 69 ".balign 4" "\n" \ 70 "__crc_" #sym ":" "\n" \ 71 ".long " #crc "\n" \ 72 ".previous" "\n") 73 74 #endif /* __LINUX_EXPORT_INTERNAL_H__ */ 75