sh: Terminate .eh_frame in VDSO with a 4-byte 0.

It's assumed that .eh_frame is terminated with 4-byte 0 in shared
libraries and executable.  It seems to be the case for VDSOs too.
Without this terminator, I saw failures when unwinding from VDSO,
though I don't know how other architectures handle this issue.
For the normal libs, crtendS.o gives this terminator.  We can use
such terminating objects.  Or we can add a 4-byte 0 with modifying
the linker script like as the patch below.

Signed-off-by: Kaz Kojima <kkojima@rr.iij4u.or.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/sh/kernel/vsyscall/vsyscall.lds.S b/arch/sh/kernel/vsyscall/vsyscall.lds.S
index c9bf2af35d35..6d59ee7c23dd 100644
--- a/arch/sh/kernel/vsyscall/vsyscall.lds.S
+++ b/arch/sh/kernel/vsyscall/vsyscall.lds.S
@@ -38,7 +38,10 @@ SECTIONS
         .text           : { *(.text) }                  :text   =0x90909090
         .note           : { *(.note.*) }                :text   :note
         .eh_frame_hdr   : { *(.eh_frame_hdr ) }         :text   :eh_frame_hdr
-        .eh_frame       : { KEEP (*(.eh_frame)) }       :text
+        .eh_frame       : {
+                KEEP (*(.eh_frame))
+                LONG (0)
+        }                                               :text
         .dynamic        : { *(.dynamic) }               :text   :dynamic
         .useless        : {
               *(.got.plt) *(.got)