summaryrefslogtreecommitdiff
path: root/include/linux/export.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/export.h')
-rw-r--r--include/linux/export.h91
1 files changed, 75 insertions, 16 deletions
diff --git a/include/linux/export.h b/include/linux/export.h
index 28a4d2150689..d59461e71478 100644
--- a/include/linux/export.h
+++ b/include/linux/export.h
@@ -20,6 +20,8 @@ extern struct module __this_module;
#ifdef CONFIG_MODULES
+#define NS_SEPARATOR "."
+
#if defined(__KERNEL__) && !defined(__GENKSYMS__)
#ifdef CONFIG_MODVERSIONS
/* Mark the CRC weak since genksyms apparently decides not to
@@ -29,13 +31,13 @@ extern struct module __this_module;
asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \
" .weak __crc_" #sym " \n" \
" .long __crc_" #sym " - . \n" \
- " .previous \n");
+ " .previous \n")
#else
#define __CRC_SYMBOL(sym, sec) \
asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \
" .weak __crc_" #sym " \n" \
" .long __crc_" #sym " \n" \
- " .previous \n");
+ " .previous \n")
#endif
#else
#define __CRC_SYMBOL(sym, sec)
@@ -49,6 +51,16 @@ extern struct module __this_module;
* absolute relocations that require runtime processing on relocatable
* kernels.
*/
+#define __KSYMTAB_ENTRY_NS(sym, sec, ns) \
+ __ADDRESSABLE(sym) \
+ asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \
+ " .balign 4 \n" \
+ "__ksymtab_" #sym NS_SEPARATOR #ns ": \n" \
+ " .long " #sym "- . \n" \
+ " .long __kstrtab_" #sym "- . \n" \
+ " .long __kstrtab_ns_" #sym "- . \n" \
+ " .previous \n")
+
#define __KSYMTAB_ENTRY(sym, sec) \
__ADDRESSABLE(sym) \
asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \
@@ -56,32 +68,53 @@ extern struct module __this_module;
"__ksymtab_" #sym ": \n" \
" .long " #sym "- . \n" \
" .long __kstrtab_" #sym "- . \n" \
+ " .long 0 - . \n" \
" .previous \n")
struct kernel_symbol {
int value_offset;
int name_offset;
+ int namespace_offset;
};
#else
+#define __KSYMTAB_ENTRY_NS(sym, sec, ns) \
+ static const struct kernel_symbol __ksymtab_##sym##__##ns \
+ asm("__ksymtab_" #sym NS_SEPARATOR #ns) \
+ __attribute__((section("___ksymtab" sec "+" #sym), used)) \
+ __aligned(sizeof(void *)) \
+ = { (unsigned long)&sym, __kstrtab_##sym, __kstrtab_ns_##sym }
+
#define __KSYMTAB_ENTRY(sym, sec) \
static const struct kernel_symbol __ksymtab_##sym \
+ asm("__ksymtab_" #sym) \
__attribute__((section("___ksymtab" sec "+" #sym), used)) \
__aligned(sizeof(void *)) \
- = { (unsigned long)&sym, __kstrtab_##sym }
+ = { (unsigned long)&sym, __kstrtab_##sym, NULL }
struct kernel_symbol {
unsigned long value;
const char *name;
+ const char *namespace;
};
#endif
-/* For every exported symbol, place a struct in the __ksymtab section */
-#define ___EXPORT_SYMBOL(sym, sec) \
+#define ___export_symbol_common(sym, sec) \
extern typeof(sym) sym; \
- __CRC_SYMBOL(sym, sec) \
+ __CRC_SYMBOL(sym, sec); \
static const char __kstrtab_##sym[] \
__attribute__((section("__ksymtab_strings"), used, aligned(1))) \
- = #sym; \
+ = #sym \
+
+/* For every exported symbol, place a struct in the __ksymtab section */
+#define ___EXPORT_SYMBOL_NS(sym, sec, ns) \
+ ___export_symbol_common(sym, sec); \
+ static const char __kstrtab_ns_##sym[] \
+ __attribute__((section("__ksymtab_strings"), used, aligned(1))) \
+ = #ns; \
+ __KSYMTAB_ENTRY_NS(sym, sec, ns)
+
+#define ___EXPORT_SYMBOL(sym, sec) \
+ ___export_symbol_common(sym, sec); \
__KSYMTAB_ENTRY(sym, sec)
#if defined(__DISABLE_EXPORTS)
@@ -91,6 +124,7 @@ struct kernel_symbol {
* be reused in other execution contexts such as the UEFI stub or the
* decompressor.
*/
+#define __EXPORT_SYMBOL_NS(sym, sec, ns)
#define __EXPORT_SYMBOL(sym, sec)
#elif defined(CONFIG_TRIM_UNUSED_KSYMS)
@@ -117,18 +151,26 @@ struct kernel_symbol {
#define __cond_export_sym_1(sym, sec) ___EXPORT_SYMBOL(sym, sec)
#define __cond_export_sym_0(sym, sec) /* nothing */
+#define __EXPORT_SYMBOL_NS(sym, sec, ns) \
+ __ksym_marker(sym); \
+ __cond_export_ns_sym(sym, sec, ns, __is_defined(__KSYM_##sym))
+#define __cond_export_ns_sym(sym, sec, ns, conf) \
+ ___cond_export_ns_sym(sym, sec, ns, conf)
+#define ___cond_export_ns_sym(sym, sec, ns, enabled) \
+ __cond_export_ns_sym_##enabled(sym, sec, ns)
+#define __cond_export_ns_sym_1(sym, sec, ns) ___EXPORT_SYMBOL_NS(sym, sec, ns)
+#define __cond_export_ns_sym_0(sym, sec, ns) /* nothing */
+
#else
+#define __EXPORT_SYMBOL_NS ___EXPORT_SYMBOL_NS
#define __EXPORT_SYMBOL ___EXPORT_SYMBOL
#endif
-#define EXPORT_SYMBOL(sym) \
- __EXPORT_SYMBOL(sym, "")
-
-#define EXPORT_SYMBOL_GPL(sym) \
- __EXPORT_SYMBOL(sym, "_gpl")
-
-#define EXPORT_SYMBOL_GPL_FUTURE(sym) \
- __EXPORT_SYMBOL(sym, "_gpl_future")
+#define EXPORT_SYMBOL(sym) __EXPORT_SYMBOL(sym, "")
+#define EXPORT_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_gpl")
+#define EXPORT_SYMBOL_GPL_FUTURE(sym) __EXPORT_SYMBOL(sym, "_gpl_future")
+#define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL_NS(sym, "", ns)
+#define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL_NS(sym, "_gpl", ns)
#ifdef CONFIG_UNUSED_SYMBOLS
#define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
@@ -138,11 +180,28 @@ struct kernel_symbol {
#define EXPORT_UNUSED_SYMBOL_GPL(sym)
#endif
-#endif /* __GENKSYMS__ */
+#endif /* __KERNEL__ && !__GENKSYMS__ */
+
+#if defined(__GENKSYMS__)
+/*
+ * When we're running genksyms, ignore the namespace and make the _NS
+ * variants look like the normal ones. There are two reasons for this:
+ * 1) In the normal definition of EXPORT_SYMBOL_NS, the 'ns' macro
+ * argument is itself not expanded because it's always tokenized or
+ * concatenated; but when running genksyms, a blank definition of the
+ * macro does allow the argument to be expanded; if a namespace
+ * happens to collide with a #define, this can cause issues.
+ * 2) There's no need to modify genksyms to deal with the _NS variants
+ */
+#define EXPORT_SYMBOL_NS(sym, ns) EXPORT_SYMBOL(sym)
+#define EXPORT_SYMBOL_NS_GPL(sym, ns) EXPORT_SYMBOL_GPL(sym)
+#endif
#else /* !CONFIG_MODULES... */
#define EXPORT_SYMBOL(sym)
+#define EXPORT_SYMBOL_NS(sym, ns)
+#define EXPORT_SYMBOL_NS_GPL(sym, ns)
#define EXPORT_SYMBOL_GPL(sym)
#define EXPORT_SYMBOL_GPL_FUTURE(sym)
#define EXPORT_UNUSED_SYMBOL(sym)