[RFC: PATCH 01/13] powerpc/booke: Add Stack Marking support to Booke Exception Prolog

[Dave Kleikamp]

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

From: Torez Smith <lnxtorez at linux.vnet.ibm.com>

Signed-off-by: Torez Smith  <lnxtorez at linux.vnet.ibm.com>
Signed-off-by: Dave Kleikamp <shaggy at linux.vnet.ibm.com>
---

 arch/powerpc/kernel/head_booke.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)


diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 50504ae..80d47f4 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -1,6 +1,8 @@
 #ifndef __HEAD_BOOKE_H__
 #define __HEAD_BOOKE_H__
 
+#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x72656773)
+
 /*
  * Macros used for common Book-e exception handling
  */
@@ -48,6 +50,9 @@
 	stw	r10,0(r11);						     \
 	rlwinm	r9,r9,0,14,12;		/* clear MSR_WE (necessary?)	   */\
 	stw	r0,GPR0(r11);						     \
+	lis	r10, STACK_FRAME_REGS_MARKER at ha;/* exception frame marker */ \
+	addi	r10, r10, STACK_FRAME_REGS_MARKER at l;			     \
+	stw	r10, 8(r11);						     \
 	SAVE_4GPRS(3, r11);						     \
 	SAVE_2GPRS(7, r11)
 

-- 
Dave Kleikamp
IBM Linux Technology Center