[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/entry.S b/arch/ppc/kernel/entry.S
index 6615237..8377b6c 100644
--- a/arch/ppc/kernel/entry.S
+++ b/arch/ppc/kernel/entry.S
@@ -46,26 +46,23 @@
#ifdef CONFIG_BOOKE
#include "head_booke.h"
+#define TRANSFER_TO_HANDLER_EXC_LEVEL(exc_level) \
+ mtspr exc_level##_SPRG,r8; \
+ BOOKE_LOAD_EXC_LEVEL_STACK(exc_level); \
+ lwz r0,GPR10-INT_FRAME_SIZE(r8); \
+ stw r0,GPR10(r11); \
+ lwz r0,GPR11-INT_FRAME_SIZE(r8); \
+ stw r0,GPR11(r11); \
+ mfspr r8,exc_level##_SPRG
+
.globl mcheck_transfer_to_handler
mcheck_transfer_to_handler:
- mtspr MCHECK_SPRG,r8
- BOOKE_LOAD_MCHECK_STACK
- lwz r0,GPR10-INT_FRAME_SIZE(r8)
- stw r0,GPR10(r11)
- lwz r0,GPR11-INT_FRAME_SIZE(r8)
- stw r0,GPR11(r11)
- mfspr r8,MCHECK_SPRG
+ TRANSFER_TO_HANDLER_EXC_LEVEL(MCHECK)
b transfer_to_handler_full
.globl crit_transfer_to_handler
crit_transfer_to_handler:
- mtspr CRIT_SPRG,r8
- BOOKE_LOAD_CRIT_STACK
- lwz r0,GPR10-INT_FRAME_SIZE(r8)
- stw r0,GPR10(r11)
- lwz r0,GPR11-INT_FRAME_SIZE(r8)
- stw r0,GPR11(r11)
- mfspr r8,CRIT_SPRG
+ TRANSFER_TO_HANDLER_EXC_LEVEL(CRIT)
/* fall through */
#endif
@@ -783,99 +780,64 @@
* time of the critical interrupt.
*
*/
+#ifdef CONFIG_40x
+#define PPC_40x_TURN_OFF_MSR_DR \
+ /* avoid any possible TLB misses here by turning off MSR.DR, we \
+ * assume the instructions here are mapped by a pinned TLB entry */ \
+ li r10,MSR_IR; \
+ mtmsr r10; \
+ isync; \
+ tophys(r1, r1);
+#else
+#define PPC_40x_TURN_OFF_MSR_DR
+#endif
+
+#define RET_FROM_EXC_LEVEL(exc_lvl_srr0, exc_lvl_srr1, exc_lvl_rfi) \
+ REST_NVGPRS(r1); \
+ lwz r3,_MSR(r1); \
+ andi. r3,r3,MSR_PR; \
+ LOAD_MSR_KERNEL(r10,MSR_KERNEL); \
+ bne user_exc_return; \
+ lwz r0,GPR0(r1); \
+ lwz r2,GPR2(r1); \
+ REST_4GPRS(3, r1); \
+ REST_2GPRS(7, r1); \
+ lwz r10,_XER(r1); \
+ lwz r11,_CTR(r1); \
+ mtspr SPRN_XER,r10; \
+ mtctr r11; \
+ PPC405_ERR77(0,r1); \
+ stwcx. r0,0,r1; /* to clear the reservation */ \
+ lwz r11,_LINK(r1); \
+ mtlr r11; \
+ lwz r10,_CCR(r1); \
+ mtcrf 0xff,r10; \
+ PPC_40x_TURN_OFF_MSR_DR; \
+ lwz r9,_DEAR(r1); \
+ lwz r10,_ESR(r1); \
+ mtspr SPRN_DEAR,r9; \
+ mtspr SPRN_ESR,r10; \
+ lwz r11,_NIP(r1); \
+ lwz r12,_MSR(r1); \
+ mtspr exc_lvl_srr0,r11; \
+ mtspr exc_lvl_srr1,r12; \
+ lwz r9,GPR9(r1); \
+ lwz r12,GPR12(r1); \
+ lwz r10,GPR10(r1); \
+ lwz r11,GPR11(r1); \
+ lwz r1,GPR1(r1); \
+ PPC405_ERR77_SYNC; \
+ exc_lvl_rfi; \
+ b .; /* prevent prefetch past exc_lvl_rfi */
+
.globl ret_from_crit_exc
ret_from_crit_exc:
- REST_NVGPRS(r1)
- lwz r3,_MSR(r1)
- andi. r3,r3,MSR_PR
- LOAD_MSR_KERNEL(r10,MSR_KERNEL)
- bne user_exc_return
-
- lwz r0,GPR0(r1)
- lwz r2,GPR2(r1)
- REST_4GPRS(3, r1)
- REST_2GPRS(7, r1)
-
- lwz r10,_XER(r1)
- lwz r11,_CTR(r1)
- mtspr SPRN_XER,r10
- mtctr r11
-
- PPC405_ERR77(0,r1)
- stwcx. r0,0,r1 /* to clear the reservation */
-
- lwz r11,_LINK(r1)
- mtlr r11
- lwz r10,_CCR(r1)
- mtcrf 0xff,r10
-#ifdef CONFIG_40x
- /* avoid any possible TLB misses here by turning off MSR.DR, we
- * assume the instructions here are mapped by a pinned TLB entry */
- li r10,MSR_IR
- mtmsr r10
- isync
- tophys(r1, r1)
-#endif
- lwz r9,_DEAR(r1)
- lwz r10,_ESR(r1)
- mtspr SPRN_DEAR,r9
- mtspr SPRN_ESR,r10
- lwz r11,_NIP(r1)
- lwz r12,_MSR(r1)
- mtspr SPRN_CSRR0,r11
- mtspr SPRN_CSRR1,r12
- lwz r9,GPR9(r1)
- lwz r12,GPR12(r1)
- lwz r10,GPR10(r1)
- lwz r11,GPR11(r1)
- lwz r1,GPR1(r1)
- PPC405_ERR77_SYNC
- rfci
- b . /* prevent prefetch past rfci */
+ RET_FROM_EXC_LEVEL(SPRN_CSRR0, SPRN_CSRR1, RFCI)
#ifdef CONFIG_BOOKE
-/*
- * Return from a machine check interrupt, similar to a critical
- * interrupt.
- */
.globl ret_from_mcheck_exc
ret_from_mcheck_exc:
- REST_NVGPRS(r1)
- lwz r3,_MSR(r1)
- andi. r3,r3,MSR_PR
- LOAD_MSR_KERNEL(r10,MSR_KERNEL)
- bne user_exc_return
-
- lwz r0,GPR0(r1)
- lwz r2,GPR2(r1)
- REST_4GPRS(3, r1)
- REST_2GPRS(7, r1)
-
- lwz r10,_XER(r1)
- lwz r11,_CTR(r1)
- mtspr SPRN_XER,r10
- mtctr r11
-
- stwcx. r0,0,r1 /* to clear the reservation */
-
- lwz r11,_LINK(r1)
- mtlr r11
- lwz r10,_CCR(r1)
- mtcrf 0xff,r10
- lwz r9,_DEAR(r1)
- lwz r10,_ESR(r1)
- mtspr SPRN_DEAR,r9
- mtspr SPRN_ESR,r10
- lwz r11,_NIP(r1)
- lwz r12,_MSR(r1)
- mtspr SPRN_MCSRR0,r11
- mtspr SPRN_MCSRR1,r12
- lwz r9,GPR9(r1)
- lwz r12,GPR12(r1)
- lwz r10,GPR10(r1)
- lwz r11,GPR11(r1)
- lwz r1,GPR1(r1)
- RFMCI
+ RET_FROM_EXC_LEVEL(SPRN_MCSRR0, SPRN_MCSRR1, RFMCI)
#endif /* CONFIG_BOOKE */
/*