[PATCH] ppc32: Factor out common exception code into macro's for 4xx/Book-E
4xx and Book-E PPC's have several exception levels. The code to handle
each level is fairly regular. Turning the code into macro's will ease the
handling of future exception levels (debug) in forth coming chips.
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/ppc/kernel/head_booke.h b/arch/ppc/kernel/head_booke.h
index f213d12..9c50f9d 100644
--- a/arch/ppc/kernel/head_booke.h
+++ b/arch/ppc/kernel/head_booke.h
@@ -67,46 +67,36 @@
#define CRIT_STACK_TOP (exception_stack_top)
#ifdef CONFIG_SMP
-#define BOOKE_LOAD_CRIT_STACK \
+#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
mfspr r8,SPRN_PIR; \
mulli r8,r8,BOOKE_EXCEPTION_STACK_SIZE; \
neg r8,r8; \
- addis r8,r8,CRIT_STACK_TOP@ha; \
- addi r8,r8,CRIT_STACK_TOP@l
-#define BOOKE_LOAD_MCHECK_STACK \
- mfspr r8,SPRN_PIR; \
- mulli r8,r8,BOOKE_EXCEPTION_STACK_SIZE; \
- neg r8,r8; \
- addis r8,r8,MCHECK_STACK_TOP@ha; \
- addi r8,r8,MCHECK_STACK_TOP@l
+ addis r8,r8,level##_STACK_TOP@ha; \
+ addi r8,r8,level##_STACK_TOP@l
#else
-#define BOOKE_LOAD_CRIT_STACK \
- lis r8,CRIT_STACK_TOP@h; \
- ori r8,r8,CRIT_STACK_TOP@l
-#define BOOKE_LOAD_MCHECK_STACK \
- lis r8,MCHECK_STACK_TOP@h; \
- ori r8,r8,MCHECK_STACK_TOP@l
+#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
+ lis r8,level##_STACK_TOP@h; \
+ ori r8,r8,level##_STACK_TOP@l
#endif
/*
- * Exception prolog for critical exceptions. This is a little different
- * from the normal exception prolog above since a critical exception
- * can potentially occur at any point during normal exception processing.
- * Thus we cannot use the same SPRG registers as the normal prolog above.
- * Instead we use a portion of the critical exception stack at low physical
- * addresses.
+ * Exception prolog for critical/machine check exceptions. This is a
+ * little different from the normal exception prolog above since a
+ * critical/machine check exception can potentially occur at any point
+ * during normal exception processing. Thus we cannot use the same SPRG
+ * registers as the normal prolog above. Instead we use a portion of the
+ * critical/machine check exception stack at low physical addresses.
*/
-
-#define CRITICAL_EXCEPTION_PROLOG \
- mtspr CRIT_SPRG,r8; \
- BOOKE_LOAD_CRIT_STACK; /* r8 points to the crit stack */ \
+#define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, exc_level_srr0, exc_level_srr1) \
+ mtspr exc_level##_SPRG,r8; \
+ BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \
stw r10,GPR10-INT_FRAME_SIZE(r8); \
stw r11,GPR11-INT_FRAME_SIZE(r8); \
mfcr r10; /* save CR in r10 for now */\
- mfspr r11,SPRN_CSRR1; /* check whether user or kernel */\
+ mfspr r11,exc_level_srr1; /* check whether user or kernel */\
andi. r11,r11,MSR_PR; \
mr r11,r8; \
- mfspr r8,CRIT_SPRG; \
+ mfspr r8,exc_level##_SPRG; \
beq 1f; \
/* COMING FROM USER MODE */ \
mfspr r11,SPRN_SPRG3; /* if from user, start at top of */\
@@ -122,9 +112,9 @@
stw r12,_DEAR(r11); /* since they may have had stuff */\
mfspr r9,SPRN_ESR; /* in them at the point where the */\
stw r9,_ESR(r11); /* exception was taken */\
- mfspr r12,SPRN_CSRR0; \
+ mfspr r12,exc_level_srr0; \
stw r1,GPR1(r11); \
- mfspr r9,SPRN_CSRR1; \
+ mfspr r9,exc_level_srr1; \
stw r1,0(r11); \
mr r1,r11; \
rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
@@ -132,45 +122,10 @@
SAVE_4GPRS(3, r11); \
SAVE_2GPRS(7, r11)
-/*
- * Exception prolog for machine check exceptions. This is similar to
- * the critical exception prolog, except that machine check exceptions
- * have their stack.
- */
-#define MCHECK_EXCEPTION_PROLOG \
- mtspr MCHECK_SPRG,r8; \
- BOOKE_LOAD_MCHECK_STACK; /* r8 points to the mcheck stack */\
- stw r10,GPR10-INT_FRAME_SIZE(r8); \
- stw r11,GPR11-INT_FRAME_SIZE(r8); \
- mfcr r10; /* save CR in r10 for now */\
- mfspr r11,SPRN_MCSRR1; /* check whether user or kernel */\
- andi. r11,r11,MSR_PR; \
- mr r11,r8; \
- mfspr r8,MCHECK_SPRG; \
- beq 1f; \
- /* COMING FROM USER MODE */ \
- mfspr r11,SPRN_SPRG3; /* if from user, start at top of */\
- lwz r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\
- addi r11,r11,THREAD_SIZE; \
-1: subi r11,r11,INT_FRAME_SIZE; /* Allocate an exception frame */\
- stw r10,_CCR(r11); /* save various registers */\
- stw r12,GPR12(r11); \
- stw r9,GPR9(r11); \
- mflr r10; \
- stw r10,_LINK(r11); \
- mfspr r12,SPRN_DEAR; /* save DEAR and ESR in the frame */\
- stw r12,_DEAR(r11); /* since they may have had stuff */\
- mfspr r9,SPRN_ESR; /* in them at the point where the */\
- stw r9,_ESR(r11); /* exception was taken */\
- mfspr r12,SPRN_MCSRR0; \
- stw r1,GPR1(r11); \
- mfspr r9,SPRN_MCSRR1; \
- stw r1,0(r11); \
- mr r1,r11; \
- rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
- stw r0,GPR0(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
+#define CRITICAL_EXCEPTION_PROLOG \
+ EXC_LEVEL_EXCEPTION_PROLOG(CRIT, SPRN_CSRR0, SPRN_CSRR1)
+#define MCHECK_EXCEPTION_PROLOG \
+ EXC_LEVEL_EXCEPTION_PROLOG(MCHECK, SPRN_MCSRR0, SPRN_MCSRR1)
/*
* Exception vectors.
@@ -237,7 +192,6 @@
EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, COPY_EE, transfer_to_handler, \
ret_from_except)
-
/* Check for a single step debug exception while in an exception
* handler before state has been saved. This is to catch the case
* where an instruction that we are trying to single step causes
@@ -291,7 +245,7 @@
lwz r9,GPR9(r11); \
lwz r12,GPR12(r11); \
mtspr CRIT_SPRG,r8; \
- BOOKE_LOAD_CRIT_STACK; /* r8 points to the crit stack */ \
+ BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */ \
lwz r10,GPR10-INT_FRAME_SIZE(r8); \
lwz r11,GPR11-INT_FRAME_SIZE(r8); \
mfspr r8,CRIT_SPRG; \