x86 vDSO: i386 vdso32

This makes the i386 kernel use the new vDSO build in arch/x86/vdso/vdso32/
to replace the old one from arch/x86/kernel/.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 17 insertions, 10 deletions

diff --git a/include/asm-x86/elf.h b/include/asm-x86/elf.h
index cd3204ebbbdd..70edff2d5671 100644
--- a/include/asm-x86/elf.h
+++ b/include/asm-x86/elf.h
@@ -78,6 +78,7 @@ typedef struct user_fxsr_struct elf_fpxregset_t;
 #include <asm/processor.h>
 #include <asm/system.h>         /* for savesegment */
 #include <asm/desc.h>
+#include <asm/vdso.h>
 
 /*
  * This is used to ensure we don't load something for the wrong architecture.
@@ -247,17 +248,9 @@ extern int dump_task_extended_fpu (struct task_struct *,
 
 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
-#define VDSO_PRELINK            0
 
-#define VDSO_SYM(x) \
-                (VDSO_CURRENT_BASE + (unsigned long)(x) - VDSO_PRELINK)
-
-#define VDSO_HIGH_EHDR          ((const struct elfhdr *) VDSO_HIGH_BASE)
-#define VDSO_EHDR               ((const struct elfhdr *) VDSO_CURRENT_BASE)
-
-extern void __kernel_vsyscall;
-
-#define VDSO_ENTRY              VDSO_SYM(&__kernel_vsyscall)
+#define VDSO_ENTRY \
+        ((unsigned long) VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
 
 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 
diff --git a/include/asm-x86/vdso.h b/include/asm-x86/vdso.h
index 9379ec06fd1f..629bcb6e8e45 100644
--- a/include/asm-x86/vdso.h
+++ b/include/asm-x86/vdso.h
@@ -1,6 +1,7 @@
 #ifndef _ASM_X86_VDSO_H
 #define _ASM_X86_VDSO_H 1
 
+#ifdef CONFIG_X86_64
 extern const char VDSO64_PRELINK[];
 
 /*
@@ -10,5 +11,18 @@ extern const char VDSO64_PRELINK[];
 #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 */