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165 lines
5.1 KiB
165 lines
5.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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#ifndef _LINUX_EXPORT_H |
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#define _LINUX_EXPORT_H |
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/* |
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* Export symbols from the kernel to modules. Forked from module.h |
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* to reduce the amount of pointless cruft we feed to gcc when only |
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* exporting a simple symbol or two. |
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* |
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* Try not to add #includes here. It slows compilation and makes kernel |
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* hackers place grumpy comments in header files. |
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*/ |
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#ifndef __ASSEMBLY__ |
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#ifdef MODULE |
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extern struct module __this_module; |
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#define THIS_MODULE (&__this_module) |
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#else |
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#define THIS_MODULE ((struct module *)0) |
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#endif |
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#ifdef CONFIG_MODVERSIONS |
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/* Mark the CRC weak since genksyms apparently decides not to |
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* generate a checksums for some symbols */ |
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#if defined(CONFIG_MODULE_REL_CRCS) |
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#define __CRC_SYMBOL(sym, sec) \ |
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asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \ |
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" .weak __crc_" #sym " \n" \ |
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" .long __crc_" #sym " - . \n" \ |
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" .previous \n") |
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#else |
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#define __CRC_SYMBOL(sym, sec) \ |
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asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \ |
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" .weak __crc_" #sym " \n" \ |
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" .long __crc_" #sym " \n" \ |
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" .previous \n") |
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#endif |
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#else |
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#define __CRC_SYMBOL(sym, sec) |
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#endif |
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#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS |
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#include <linux/compiler.h> |
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/* |
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* Emit the ksymtab entry as a pair of relative references: this reduces |
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* the size by half on 64-bit architectures, and eliminates the need for |
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* absolute relocations that require runtime processing on relocatable |
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* kernels. |
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*/ |
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#define __KSYMTAB_ENTRY(sym, sec) \ |
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__ADDRESSABLE(sym) \ |
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asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \ |
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" .balign 4 \n" \ |
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"__ksymtab_" #sym ": \n" \ |
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" .long " #sym "- . \n" \ |
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" .long __kstrtab_" #sym "- . \n" \ |
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" .long __kstrtabns_" #sym "- . \n" \ |
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" .previous \n") |
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struct kernel_symbol { |
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int value_offset; |
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int name_offset; |
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int namespace_offset; |
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}; |
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#else |
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#define __KSYMTAB_ENTRY(sym, sec) \ |
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static const struct kernel_symbol __ksymtab_##sym \ |
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__attribute__((section("___ksymtab" sec "+" #sym), used)) \ |
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__aligned(sizeof(void *)) \ |
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= { (unsigned long)&sym, __kstrtab_##sym, __kstrtabns_##sym } |
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struct kernel_symbol { |
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unsigned long value; |
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const char *name; |
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const char *namespace; |
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}; |
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#endif |
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#ifdef __GENKSYMS__ |
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#define ___EXPORT_SYMBOL(sym, sec, ns) __GENKSYMS_EXPORT_SYMBOL(sym) |
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#else |
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/* |
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* For every exported symbol, do the following: |
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* |
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* - If applicable, place a CRC entry in the __kcrctab section. |
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* - Put the name of the symbol and namespace (empty string "" for none) in |
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* __ksymtab_strings. |
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* - Place a struct kernel_symbol entry in the __ksymtab section. |
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* |
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* note on .section use: we specify progbits since usage of the "M" (SHF_MERGE) |
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* section flag requires it. Use '%progbits' instead of '@progbits' since the |
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* former apparently works on all arches according to the binutils source. |
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*/ |
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#define ___EXPORT_SYMBOL(sym, sec, ns) \ |
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extern typeof(sym) sym; \ |
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extern const char __kstrtab_##sym[]; \ |
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extern const char __kstrtabns_##sym[]; \ |
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__CRC_SYMBOL(sym, sec); \ |
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asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1 \n" \ |
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"__kstrtab_" #sym ": \n" \ |
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" .asciz \"" #sym "\" \n" \ |
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"__kstrtabns_" #sym ": \n" \ |
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" .asciz \"" ns "\" \n" \ |
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" .previous \n"); \ |
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__KSYMTAB_ENTRY(sym, sec) |
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#endif |
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#if !defined(CONFIG_MODULES) || defined(__DISABLE_EXPORTS) |
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/* |
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* Allow symbol exports to be disabled completely so that C code may |
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* be reused in other execution contexts such as the UEFI stub or the |
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* decompressor. |
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*/ |
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#define __EXPORT_SYMBOL(sym, sec, ns) |
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#elif defined(CONFIG_TRIM_UNUSED_KSYMS) |
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#include <generated/autoksyms.h> |
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/* |
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* For fine grained build dependencies, we want to tell the build system |
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* about each possible exported symbol even if they're not actually exported. |
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* We use a symbol pattern __ksym_marker_<symbol> that the build system filters |
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* from the $(NM) output (see scripts/gen_ksymdeps.sh). These symbols are |
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* discarded in the final link stage. |
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*/ |
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#define __ksym_marker(sym) \ |
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static int __ksym_marker_##sym[0] __section(".discard.ksym") __used |
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#define __EXPORT_SYMBOL(sym, sec, ns) \ |
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__ksym_marker(sym); \ |
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__cond_export_sym(sym, sec, ns, __is_defined(__KSYM_##sym)) |
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#define __cond_export_sym(sym, sec, ns, conf) \ |
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___cond_export_sym(sym, sec, ns, conf) |
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#define ___cond_export_sym(sym, sec, ns, enabled) \ |
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__cond_export_sym_##enabled(sym, sec, ns) |
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#define __cond_export_sym_1(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns) |
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#define __cond_export_sym_0(sym, sec, ns) /* nothing */ |
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#else |
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#define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns) |
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#endif /* CONFIG_MODULES */ |
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#ifdef DEFAULT_SYMBOL_NAMESPACE |
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#include <linux/stringify.h> |
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#define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, __stringify(DEFAULT_SYMBOL_NAMESPACE)) |
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#else |
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#define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") |
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#endif |
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#define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "") |
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#define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl") |
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#define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", #ns) |
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#define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "_gpl", #ns) |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _LINUX_EXPORT_H */
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