From 4d1d51dc4b13af9771d8c35e16299c8744fc106d Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@redhat.com>
Date: Wed, 30 Jan 2008 13:30:40 +0100
Subject: [PATCH] --- yaml --- r: 79831 b: refs/heads/master c:
 5b93049337301d6fbd3cf55db99b34e6b0dbd3a3 h: refs/heads/master i:   79829:
 23bc87a4328449fadee82cace74b191eb121a07a   79827:
 002c85b08ffa7b03493ac111dde232f60d49c43b   79823:
 113233cd9fd91d3236aa43d06fdd4849547dff8b v: v3

---
 [refs]                         |  2 +-
 trunk/arch/x86/vdso/Makefile   | 14 ++++++++++++++
 trunk/arch/x86/vdso/vdso.lds.S | 10 ++++++++++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 9b6cd423c8b7..d12c495d9b61 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c1d171a002942ea2d93b4fbd0c9583c56fce0772
+refs/heads/master: 5b93049337301d6fbd3cf55db99b34e6b0dbd3a3
diff --git a/trunk/arch/x86/vdso/Makefile b/trunk/arch/x86/vdso/Makefile
index e7bff0fbac23..d8200adae9fa 100644
--- a/trunk/arch/x86/vdso/Makefile
+++ b/trunk/arch/x86/vdso/Makefile
@@ -55,6 +55,20 @@ SYSCFLAGS_vdso-syms.o = -r -d
 $(obj)/vdso-syms.o: $(src)/vdso.lds $(vobjs) FORCE
 	$(call if_changed,syscall)
 
+targets += vdso-syms.lds
+obj-y += vdso-syms.lds
+
+#
+# Match symbols in the DSO that look like VDSO*; produce a file of constants.
+#
+sed-vdsosym := -e 's/^00*/0/' \
+	-e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
+quiet_cmd_vdsosym = VDSOSYM $@
+      cmd_vdsosym = $(NM) $< | sed -n $(sed-vdsosym) | LC_ALL=C sort > $@
+
+$(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
+	$(call if_changed,vdsosym)
+
 quiet_cmd_vdso_install = INSTALL $@
       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
 vdso.so:
diff --git a/trunk/arch/x86/vdso/vdso.lds.S b/trunk/arch/x86/vdso/vdso.lds.S
index 667d3245d972..d40d0e906190 100644
--- a/trunk/arch/x86/vdso/vdso.lds.S
+++ b/trunk/arch/x86/vdso/vdso.lds.S
@@ -8,6 +8,16 @@
 
 #define VDSO_PRELINK 0xffffffffff700000
 
+/*
+ * Symbols we define here called VDSO* get their values into vdso-syms.lds
+ * and become visible to the kernel itself.
+ */
+VDSO64_PRELINK = VDSO_PRELINK;
+
+#define VEXTERN(x)	VDSO64_ ## x = vdso_ ## x;
+#include "vextern.h"
+#undef	VEXTERN
+
 SECTIONS
 {
   . = VDSO_PRELINK + SIZEOF_HEADERS;