| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | #ifndef _LINUX_EXPORT_H |
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| 3 | #define _LINUX_EXPORT_H |
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| 4 | |
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| 5 | #include <linux/compiler.h> |
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| 6 | #include <linux/linkage.h> |
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| 7 | #include <linux/stringify.h> |
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| 8 | |
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| 9 | /* |
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| 10 | * This comment block is used by fixdep. Please do not remove. |
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| 11 | * |
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| 12 | * When CONFIG_MODVERSIONS is changed from n to y, all source files having |
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| 13 | * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a |
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| 14 | * side effect of the *.o build rule. |
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| 15 | */ |
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| 16 | |
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| 17 | #ifdef CONFIG_64BIT |
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| 18 | #define __EXPORT_SYMBOL_REF(sym) \ |
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| 19 | .balign 8 ASM_NL \ |
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| 20 | .quad sym |
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| 21 | #else |
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| 22 | #define __EXPORT_SYMBOL_REF(sym) \ |
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| 23 | .balign 4 ASM_NL \ |
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| 24 | .long sym |
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| 25 | #endif |
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| 26 | |
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| 27 | #define ___EXPORT_SYMBOL(sym, license, ns) \ |
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| 28 | .section ".export_symbol","a" ASM_NL \ |
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| 29 | __export_symbol_##sym: ASM_NL \ |
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| 30 | .asciz license ASM_NL \ |
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| 31 | .asciz ns ASM_NL \ |
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| 32 | __EXPORT_SYMBOL_REF(sym) ASM_NL \ |
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| 33 | .previous |
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| 34 | |
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| 35 | #if defined(__DISABLE_EXPORTS) |
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| 36 | |
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| 37 | /* |
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| 38 | * Allow symbol exports to be disabled completely so that C code may |
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| 39 | * be reused in other execution contexts such as the UEFI stub or the |
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| 40 | * decompressor. |
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| 41 | */ |
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| 42 | #define __EXPORT_SYMBOL(sym, license, ns) |
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| 43 | |
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| 44 | #elif defined(__GENKSYMS__) |
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| 45 | |
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| 46 | #define __EXPORT_SYMBOL(sym, license, ns) __GENKSYMS_EXPORT_SYMBOL(sym) |
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| 47 | |
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| 48 | #elif defined(__ASSEMBLY__) |
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| 49 | |
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| 50 | #define __EXPORT_SYMBOL(sym, license, ns) \ |
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| 51 | ___EXPORT_SYMBOL(sym, license, ns) |
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| 52 | |
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| 53 | #else |
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| 54 | |
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| 55 | #define __EXPORT_SYMBOL(sym, license, ns) \ |
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| 56 | extern typeof(sym) sym; \ |
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| 57 | __ADDRESSABLE(sym) \ |
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| 58 | asm(__stringify(___EXPORT_SYMBOL(sym, license, ns))) |
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| 59 | |
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| 60 | #endif |
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| 61 | |
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| 62 | #ifdef DEFAULT_SYMBOL_NAMESPACE |
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| 63 | #define _EXPORT_SYMBOL(sym, license) __EXPORT_SYMBOL(sym, license, __stringify(DEFAULT_SYMBOL_NAMESPACE)) |
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| 64 | #else |
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| 65 | #define _EXPORT_SYMBOL(sym, license) __EXPORT_SYMBOL(sym, license, "") |
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| 66 | #endif |
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| 67 | |
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| 68 | #define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "") |
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| 69 | #define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "GPL") |
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| 70 | #define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", __stringify(ns)) |
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| 71 | #define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "GPL", __stringify(ns)) |
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| 72 | |
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| 73 | #endif /* _LINUX_EXPORT_H */ |
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| 74 | |
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