powerpc/booke: Add Stack Marking support to Booke Exception Prolog

This patch adds a marker to the exception stack frame to aid in debugging.
It's already inserted on other platforms and xmon recognizes it and
identifies exception frames when showing stack traces.

Signed-off-by: Torez Smith  <lnxtorez@linux.vnet.ibm.com>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 50504ae39cb7..a0bf158c8b47 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -1,6 +1,7 @@
 #ifndef __HEAD_BOOKE_H__
 #define __HEAD_BOOKE_H__
 
+#include <asm/ptrace.h> /* for STACK_FRAME_REGS_MARKER */
 /*
  * Macros used for common Book-e exception handling
  */
@@ -48,6 +49,9 @@
         stw     r10,0(r11);                                                  \
         rlwinm  r9,r9,0,14,12;          /* clear MSR_WE (necessary?)       */\
         stw     r0,GPR0(r11);                                                \
+        lis     r10, STACK_FRAME_REGS_MARKER@ha;/* exception frame marker */ \
+        addi    r10, r10, STACK_FRAME_REGS_MARKER@l;                         \
+        stw     r10, 8(r11);                                                 \
         SAVE_4GPRS(3, r11);                                                  \
         SAVE_2GPRS(7, r11)