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

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Submitter Dave Kleikamp
Date March 5, 2010, 8:43 p.m.
Message ID <20100305204301.18424.76490.sendpatchset@norville.austin.ibm.com>
Download mbox | patch
Permalink /patch/47021/
State Accepted, archived
Commit 471c70ff39809af783c7718defe574a9ba81dd26
Delegated to: Josh Boyer
Headers show

Comments

Dave Kleikamp - March 5, 2010, 8:43 p.m.
powerpc/booke: Add Stack Marking support to Booke Exception Prolog

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

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>
---

 arch/powerpc/kernel/head_booke.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 50504ae..a0bf158 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)