1 files changed, 20 insertions, 13 deletions

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index ba9393f8e77a..aefafc6330c9 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -56,8 +56,17 @@
  * is necessary since the MMU is always on, for Book-E parts, and the stacks
  * are offset from KERNELBASE.
  *
+ * There is some space optimization to be had here if desired.  However
+ * to allow for a common kernel with support for debug exceptions either
+ * going to critical or their own debug level we aren't currently
+ * providing configurations that micro-optimize space usage.
  */
-#define BOOKE_EXCEPTION_STACK_SIZE      (8192)
+#ifdef CONFIG_44x
+#define NUM_EXCEPTION_LVLS      2
+#else
+#define NUM_EXCEPTION_LVLS      3
+#endif
+#define BOOKE_EXCEPTION_STACK_SIZE      (4096 * NUM_EXCEPTION_LVLS)
 
 /* CRIT_SPRG only used in critical exception handling */
 #define CRIT_SPRG       SPRN_SPRG2
@@ -68,7 +77,7 @@
 #define CRIT_STACK_TOP          (exception_stack_top)
 
 /* only on e200 for now */
-#define DEBUG_STACK_TOP         (exception_stack_top - 4096)
+#define DEBUG_STACK_TOP         (exception_stack_top - 8192)
 #define DEBUG_SPRG              SPRN_SPRG6W
 
 #ifdef CONFIG_SMP
@@ -212,9 +221,8 @@ label:
  * save (and later restore) the MSR via SPRN_CSRR1, which will still have
  * the MSR_DE bit set.
  */
-#ifdef CONFIG_E200
-#define DEBUG_EXCEPTION                                                       \
-        START_EXCEPTION(Debug);                                               \
+#define DEBUG_DEBUG_EXCEPTION                                                 \
+        START_EXCEPTION(DebugDebug);                                          \
         DEBUG_EXCEPTION_PROLOG;                                               \
                                                                               \
         /*                                                                    \
@@ -234,8 +242,8 @@ label:
         cmplw   r12,r10;                                                      \
         blt+    2f;                     /* addr below exception vectors */    \
                                                                               \
-        lis     r10,Debug@h;                                                  \
-        ori     r10,r10,Debug@l;                                              \
+        lis     r10,DebugDebug@h;                                             \
+        ori     r10,r10,DebugDebug@l;                                         \
         cmplw   r12,r10;                                                      \
         bgt+    2f;                     /* addr above exception vectors */    \
                                                                               \
@@ -265,9 +273,9 @@ label:
 2:      mfspr   r4,SPRN_DBSR;                                                 \
         addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
         EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, debug_transfer_to_handler, ret_from_debug_exc)
-#else
-#define DEBUG_EXCEPTION                                                       \
-        START_EXCEPTION(Debug);                                               \
+
+#define DEBUG_CRIT_EXCEPTION                                                  \
+        START_EXCEPTION(DebugCrit);                                           \
         CRITICAL_EXCEPTION_PROLOG;                                            \
                                                                               \
         /*                                                                    \
@@ -287,8 +295,8 @@ label:
         cmplw   r12,r10;                                                      \
         blt+    2f;                     /* addr below exception vectors */    \
                                                                               \
-        lis     r10,Debug@h;                                                  \
-        ori     r10,r10,Debug@l;                                              \
+        lis     r10,DebugCrit@h;                                                      \
+        ori     r10,r10,DebugCrit@l;                                          \
         cmplw   r12,r10;                                                      \
         bgt+    2f;                     /* addr above exception vectors */    \
                                                                               \
@@ -318,7 +326,6 @@ label:
 2:      mfspr   r4,SPRN_DBSR;                                                 \
         addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
         EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)
-#endif
 
 #define INSTRUCTION_STORAGE_EXCEPTION                                         \
         START_EXCEPTION(InstructionStorage)                                   \