EXPORT_SYMBOL() for asm

[cascardo/linux.git] / include / asm-generic / export.h

diff --git a/include/asm-generic/export.h b/include/asm-generic/export.h
new file mode 100644 (file)
index 0000000..43199a0
--- /dev/null
+++ b/include/asm-generic/export.h
@@ -0,0 +1,94 @@
+#ifndef __ASM_GENERIC_EXPORT_H
+#define __ASM_GENERIC_EXPORT_H
+
+#ifndef KSYM_FUNC
+#define KSYM_FUNC(x) x
+#endif
+#ifdef CONFIG_64BIT
+#define __put .quad
+#ifndef KSYM_ALIGN
+#define KSYM_ALIGN 8
+#endif
+#ifndef KCRC_ALIGN
+#define KCRC_ALIGN 8
+#endif
+#else
+#define __put .long
+#ifndef KSYM_ALIGN
+#define KSYM_ALIGN 4
+#endif
+#ifndef KCRC_ALIGN
+#define KCRC_ALIGN 4
+#endif
+#endif
+
+#ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
+#define KSYM(name) _##name
+#else
+#define KSYM(name) name
+#endif
+
+/*
+ * note on .section use: @progbits vs %progbits nastiness doesn't matter,
+ * since we immediately emit into those sections anyway.
+ */
+.macro ___EXPORT_SYMBOL name,val,sec
+#ifdef CONFIG_MODULES
+       .globl KSYM(__ksymtab_\name)
+       .section ___ksymtab\sec+\name,"a"
+       .balign KSYM_ALIGN
+KSYM(__ksymtab_\name):
+       __put \val, KSYM(__kstrtab_\name)
+       .previous
+       .section __ksymtab_strings,"a"
+KSYM(__kstrtab_\name):
+#ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
+       .asciz "_\name"
+#else
+       .asciz "\name"
+#endif
+       .previous
+#ifdef CONFIG_MODVERSIONS
+       .section ___kcrctab\sec+\name,"a"
+       .balign KCRC_ALIGN
+KSYM(__kcrctab_\name):
+       __put KSYM(__crc_\name)
+       .weak KSYM(__crc_\name)
+       .previous
+#endif
+#endif
+.endm
+#undef __put
+
+#if defined(__KSYM_DEPS__)
+
+#define __EXPORT_SYMBOL(sym, val, sec) === __KSYM_##sym ===
+
+#elif defined(CONFIG_TRIM_UNUSED_KSYMS)
+
+#include <linux/kconfig.h>
+#include <generated/autoksyms.h>
+
+#define __EXPORT_SYMBOL(sym, val, sec)                         \
+       __cond_export_sym(sym, val, sec, config_enabled(__KSYM_##sym))
+#define __cond_export_sym(sym, val, sec, conf)                 \
+       ___cond_export_sym(sym, val, sec, conf)
+#define ___cond_export_sym(sym, val, sec, enabled)             \
+       __cond_export_sym_##enabled(sym, val, sec)
+#define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
+#define __cond_export_sym_0(sym, val, sec) /* nothing */
+
+#else
+#define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
+#endif
+
+#define EXPORT_SYMBOL(name)                                    \
+       __EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)),)
+#define EXPORT_SYMBOL_GPL(name)                                \
+       __EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)), _gpl)
+#define EXPORT_DATA_SYMBOL(name)                               \
+       __EXPORT_SYMBOL(name, KSYM(name),)
+#define EXPORT_DATA_SYMBOL_GPL(name)                           \
+       __EXPORT_SYMBOL(name, KSYM(name),_gpl)
+
+#endif