1 files changed, 28 insertions, 0 deletions

diff --git a/include/asm-x86/vdso.h b/include/asm-x86/vdso.h
new file mode 100644
index 000000000000..629bcb6e8e45
--- /dev/null
+++ b/include/asm-x86/vdso.h
@@ -0,0 +1,28 @@
+#ifndef _ASM_X86_VDSO_H
+#define _ASM_X86_VDSO_H 1
+
+#ifdef CONFIG_X86_64
+extern const char VDSO64_PRELINK[];
+
+/*
+ * Given a pointer to the vDSO image, find the pointer to VDSO64_name
+ * as that symbol is defined in the vDSO sources or linker script.
+ */
+#define VDSO64_SYMBOL(base, name) ({            \
+        extern const char VDSO64_##name[];      \
+        (void *) (VDSO64_##name - VDSO64_PRELINK + (unsigned long) (base)); })
+#endif
+
+#if defined CONFIG_X86_32 || defined CONFIG_COMPAT
+extern const char VDSO32_PRELINK[];
+
+/*
+ * Given a pointer to the vDSO image, find the pointer to VDSO32_name
+ * as that symbol is defined in the vDSO sources or linker script.
+ */
+#define VDSO32_SYMBOL(base, name) ({            \
+        extern const char VDSO32_##name[];      \
+        (void *) (VDSO32_##name - VDSO32_PRELINK + (unsigned long) (base)); })
+#endif
+
+#endif  /* asm-x86/vdso.h */