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>

4 files changed, 23 insertions, 6 deletions

diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile
index a02e1ca2a1bc..ca2aabf8ed39 100644
--- a/arch/x86/vdso/Makefile
+++ b/arch/x86/vdso/Makefile
@@ -14,7 +14,8 @@ vdso-install-$(VDSO32-y)	+= $(vdso32-y:=.so)
 vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vvar.o
 
 # files to link into kernel
-obj-y := vma.o vdso.o
+obj-$(VDSO64-y)                 += vma.o vdso.o
+obj-$(CONFIG_X86_32)            += vdso32.o
 
 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
 
@@ -52,7 +53,7 @@ $(obj)/vclock_gettime.o: KBUILD_CFLAGS = $(CFL)
 $(obj)/vgetcpu.o: KBUILD_CFLAGS = $(CFL)
 
 targets += vdso-syms.lds
-obj-y += vdso-syms.lds
+obj-$(VDSO64-y)                 += vdso-syms.lds
 
 #
 # Match symbols in the DSO that look like VDSO*; produce a file of constants.
@@ -68,6 +69,7 @@ $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
 #
 # Build multiple 32-bit vDSO images to choose from at boot time.
 #
+obj-$(VDSO32-y)                 += vdso32-syms.lds
 vdso32.so-$(CONFIG_X86_32)      += int80
 vdso32.so-$(VDSO32-y)           += sysenter
 
@@ -84,6 +86,8 @@ targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o)
 
 extra-y += $(vdso32.so-y:%=vdso32-%.so)
 
+$(obj)/vdso32.o: $(vdso32.so-y:%=$(obj)/vdso32-%.so)
+
 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
 $(vdso32.so-y:%=$(obj)/vdso32-%.so.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
 $(vdso32.so-y:%=$(obj)/vdso32-%.so.dbg): asflags-$(CONFIG_X86_64) += -m32
diff --git a/arch/x86/vdso/vdso32.S b/arch/x86/vdso/vdso32.S
new file mode 100644
index 000000000000..cab020c99c3d
--- /dev/null
+++ b/arch/x86/vdso/vdso32.S
@@ -0,0 +1,15 @@
+#include <linux/init.h>
+
+__INITDATA
+
+        .globl vsyscall_int80_start, vsyscall_int80_end
+vsyscall_int80_start:
+        .incbin "arch/x86/vdso/vdso32-int80.so"
+vsyscall_int80_end:
+
+        .globl vsyscall_sysenter_start, vsyscall_sysenter_end
+vsyscall_sysenter_start:
+        .incbin "arch/x86/vdso/vdso32-sysenter.so"
+vsyscall_sysenter_end:
+
+__FINIT
diff --git a/arch/x86/vdso/vdso32/note.S b/arch/x86/vdso/vdso32/note.S
index 0cf934f2633e..c83f25734696 100644
--- a/arch/x86/vdso/vdso32/note.S
+++ b/arch/x86/vdso/vdso32/note.S
@@ -35,10 +35,9 @@ ELFNOTE_END
 
 #include "../../xen/vdso.h"     /* Defines VDSO_NOTE_NONEGSEG_BIT.  */
 
-        .globl VDSO_NOTE_MASK
 ELFNOTE_START(GNU, 2, "a")
         .long 1                 /* ncaps */
-VDSO_NOTE_MASK:
+VDSO32_NOTE_MASK:               /* Symbol used by arch/x86/xen/setup.c */
         .long 0                 /* mask */
         .byte VDSO_NOTE_NONEGSEG_BIT; .asciz "nosegneg" /* bit, name */
 ELFNOTE_END
diff --git a/arch/x86/vdso/vdso32/sysenter.S b/arch/x86/vdso/vdso32/sysenter.S
index 4b98fc41d3e0..109bfa394eaa 100644
--- a/arch/x86/vdso/vdso32/sysenter.S
+++ b/arch/x86/vdso/vdso32/sysenter.S
@@ -45,8 +45,7 @@ __kernel_vsyscall:
         /* 14: System call restart point is here! (SYSENTER_RETURN-2) */
         jmp .Lenter_kernel
         /* 16: System call normal return point is here! */
-        .globl SYSENTER_RETURN  /* Symbol used by sysenter.c  */
-SYSENTER_RETURN:
+VDSO32_SYSENTER_RETURN: /* Symbol used by sysenter.c via vdso32-syms.h */
         pop %ebp
 .Lpop_ebp:
         pop %edx