3 files changed, 14 insertions, 0 deletions

diff --git a/arch/sh/include/asm/entry-macros.S b/arch/sh/include/asm/entry-macros.S
index 1bdd93891cd7..64fd0de24daf 100644
--- a/arch/sh/include/asm/entry-macros.S
+++ b/arch/sh/include/asm/entry-macros.S
@@ -108,3 +108,15 @@
 #else
 # define PREF(x)        nop
 #endif
+
+        /*
+         * Macro for use within assembly. Because the DWARF unwinder
+         * needs to use the frame register to unwind the stack, we
+         * need to setup r14 with the value of the stack pointer as
+         * the return address is usually on the stack somewhere.
+         */
+        .macro  setup_frame_reg
+#ifdef CONFIG_DWARF_UNWINDER
+        mov     r15, r14
+#endif
+        .endm
diff --git a/arch/sh/kernel/cpu/sh3/entry.S b/arch/sh/kernel/cpu/sh3/entry.S
index 3cb531f233f2..67ad6467c694 100644
--- a/arch/sh/kernel/cpu/sh3/entry.S
+++ b/arch/sh/kernel/cpu/sh3/entry.S
@@ -137,6 +137,7 @@ ENTRY(tlb_protection_violation_store)
          mov    #1, r5
 
 call_dpf:
+        setup_frame_reg
         mov.l   1f, r0
         mov     r5, r8
         mov.l   @r0, r6
diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S
index fc26ccd82789..b3b215fb21f7 100644
--- a/arch/sh/kernel/entry-common.S
+++ b/arch/sh/kernel/entry-common.S
@@ -285,6 +285,7 @@ ret_from_fork:
  * system calls and debug traps through their respective jump tables.
  */
 ENTRY(system_call)
+        setup_frame_reg
 #if !defined(CONFIG_CPU_SH2)
         mov.l   1f, r9
         mov.l   @r9, r8         ! Read from TRA (Trap Address) Register