ARC: dw2 unwind: switch to .eh_frame based unwinding
So finally after almost 8 years of dealing with .debug_frame, we are
finally switching to .eh_frame. The reason being stripped kernel
binaries had non-functional unwinder as .debug_frame was gone.
Also, in general .eh_frame seems more common way of doing unwinding.
This also folds a revert of f52e126cc747 ("ARC: unwind: ensure that
.debug_frame is generated (vs. .eh_frame)") to ensure that we start
getting .eh_frame
Reported-by: Daniel Mentz <danielmentz@google.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/kernel/unwind.c b/arch/arc/kernel/unwind.c
index 4e5dbe7..61fd1ce 100644
--- a/arch/arc/kernel/unwind.c
+++ b/arch/arc/kernel/unwind.c
@@ -111,7 +111,7 @@
#define DW_EH_PE_indirect 0x80
#define DW_EH_PE_omit 0xff
-#define CIE_ID 0xffffffffUL
+#define CIE_ID 0
typedef unsigned long uleb128_t;
typedef signed long sleb128_t;
@@ -510,8 +510,7 @@
{
const u32 *cie;
- /* cie = fde + 1 - fde[1] / sizeof(*fde); */
- cie = (u32 *) fde[1];
+ cie = fde + 1 - fde[1] / sizeof(*fde);
return cie;
}