diff options
Diffstat (limited to 'include/linux/export.h')
| -rw-r--r-- | include/linux/export.h | 57 |
1 files changed, 45 insertions, 12 deletions
diff --git a/include/linux/export.h b/include/linux/export.h index b768d6dd3c90..ae072bc5aacf 100644 --- a/include/linux/export.h +++ b/include/linux/export.h @@ -18,12 +18,6 @@ #define VMLINUX_SYMBOL_STR(x) __VMLINUX_SYMBOL_STR(x) #ifndef __ASSEMBLY__ -struct kernel_symbol -{ - unsigned long value; - const char *name; -}; - #ifdef MODULE extern struct module __this_module; #define THIS_MODULE (&__this_module) @@ -54,19 +48,58 @@ extern struct module __this_module; #define __CRC_SYMBOL(sym, sec) #endif +#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS +#include <linux/compiler.h> +/* + * Emit the ksymtab entry as a pair of relative references: this reduces + * the size by half on 64-bit architectures, and eliminates the need for + * absolute relocations that require runtime processing on relocatable + * kernels. + */ +#define __KSYMTAB_ENTRY(sym, sec) \ + __ADDRESSABLE(sym) \ + asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \ + " .balign 8 \n" \ + "__ksymtab_" #sym ": \n" \ + " .long " #sym "- . \n" \ + " .long __kstrtab_" #sym "- . \n" \ + " .previous \n") + +struct kernel_symbol { + int value_offset; + int name_offset; +}; +#else +#define __KSYMTAB_ENTRY(sym, sec) \ + static const struct kernel_symbol __ksymtab_##sym \ + __attribute__((section("___ksymtab" sec "+" #sym), used)) \ + = { (unsigned long)&sym, __kstrtab_##sym } + +struct kernel_symbol { + unsigned long value; + const char *name; +}; +#endif + /* For every exported symbol, place a struct in the __ksymtab section */ #define ___EXPORT_SYMBOL(sym, sec) \ extern typeof(sym) sym; \ __CRC_SYMBOL(sym, sec) \ static const char __kstrtab_##sym[] \ - __attribute__((section("__ksymtab_strings"), aligned(1))) \ + __attribute__((section("__ksymtab_strings"), used, aligned(1))) \ = #sym; \ - static const struct kernel_symbol __ksymtab_##sym \ - __used \ - __attribute__((section("___ksymtab" sec "+" #sym), used)) \ - = { (unsigned long)&sym, __kstrtab_##sym } + __KSYMTAB_ENTRY(sym, sec) + +#if defined(__DISABLE_EXPORTS) + +/* + * Allow symbol exports to be disabled completely so that C code may + * be reused in other execution contexts such as the UEFI stub or the + * decompressor. + */ +#define __EXPORT_SYMBOL(sym, sec) -#if defined(__KSYM_DEPS__) +#elif defined(__KSYM_DEPS__) /* * For fine grained build dependencies, we want to tell the build system |