1 files changed, 46 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/095-ARC-unwind-ensure-that-.debug_frame-is-generated-vs..patch b/target/linux/generic/patches-4.4/095-ARC-unwind-ensure-that-.debug_frame-is-generated-vs..patch
new file mode 100644
index 0000000000..a1e287c6be
--- /dev/null
+++ b/target/linux/generic/patches-4.4/095-ARC-unwind-ensure-that-.debug_frame-is-generated-vs..patch
@@ -0,0 +1,46 @@
+From 23cd0de28cc7978130b770dd59b18ac143253351 Mon Sep 17 00:00:00 2001
+From: Vineet Gupta <vgupta@synopsys.com>
+Date: Tue, 28 Jun 2016 09:42:25 +0530
+Subject: [PATCH] ARC: unwind: ensure that .debug_frame is generated (vs.
+ .eh_frame)
+
+With recent binutils update to support dwarf CFI pseudo-ops in gas, we
+now get .eh_frame vs. .debug_frame. Although the call frame info is
+exactly the same in both, the CIE differs, which the current kernel
+unwinder can't cope with.
+
+This broke both the kernel unwinder as well as loadable modules (latter
+because of a new unhandled relo R_ARC_32_PCREL from .rela.eh_frame in
+the module loader)
+
+The ideal solution would be to switch unwinder to .eh_frame.
+For now however we can make do by just ensureing .debug_frame is
+generated by removing -fasynchronous-unwind-tables
+
+ .eh_frame    generated with -gdwarf-2 -fasynchronous-unwind-tables
+ .debug_frame generated with -gdwarf-2
+
+Fixes STAR 9001058196
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
+---
+ arch/arc/Makefile | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/arch/arc/Makefile b/arch/arc/Makefile
+index aeb1902..209d845 100644
+--- a/arch/arc/Makefile
++++ b/arch/arc/Makefile
+@@ -48,8 +48,6 @@ endif
+ 
+ endif
+ 
+-cflags-$(CONFIG_ARC_DW2_UNWIND)		+= -fasynchronous-unwind-tables
+-
+ # By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
+ ifeq ($(atleast_gcc48),y)
+ cflags-$(CONFIG_ARC_DW2_UNWIND)		+= -gdwarf-2
+-- 
+2.5.5
+