ARC: DWARF2 .debug_frame based stack unwinder

-Originally written by Rajeshwar Ranga
-Derived off of generic unwinder in 2.6.19 and adapted to ARC

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Rajeshwar Ranga <rajeshwar.ranga@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 52f5c072f6da..0979d8e6fc16 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -25,6 +25,7 @@ config ARC
         select HAVE_ARCH_TRACEHOOK
         select HAVE_GENERIC_HARDIRQS
         select HAVE_MEMBLOCK
+        select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
         select HAVE_OPROFILE
         select IRQ_DOMAIN
         select MODULES_USE_ELF_RELA
@@ -344,6 +345,20 @@ menuconfig ARC_DBG
         bool "ARC debugging"
         default y
 
+config ARC_DW2_UNWIND
+        bool "Enable DWARF specific kernel stack unwind"
+        depends on ARC_DBG
+        default y
+        select KALLSYMS
+        help
+          Compiles the kernel with DWARF unwind information and can be used
+          to get stack backtraces.
+
+          If you say Y here the resulting kernel image will be slightly larger
+          but not slower, and it will give very useful debugging information.
+          If you don't debug the kernel, you can say N, but we may not be able
+          to solve problems without frame unwind information
+
 config ARC_DBG_TLB_PARANOIA
         bool "Paranoia Checks in Low Level TLB Handlers"
         depends on ARC_DBG && !SMP