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-rw-r--r--arch/powerpc/kernel/exceptions-64s.S97
1 files changed, 59 insertions, 38 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index eb898112e577..1808876edcc9 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -12,6 +12,8 @@
*
*/
+#include <asm/exception-64s.h>
+
/*
* We layout physical memory as follows:
* 0x0000 - 0x00ff : Secondary processor spin code
@@ -22,18 +24,6 @@
* 0x8000 - : Early init and support code
*/
-
-/*
- * SPRG Usage
- *
- * Register Definition
- *
- * SPRG0 reserved for hypervisor
- * SPRG1 temp - used to save gpr
- * SPRG2 temp - used to save gpr
- * SPRG3 virt addr of paca
- */
-
/*
* This is the start of the interrupt handlers for pSeries
* This code runs with relocation off.
@@ -51,34 +41,44 @@ __start_interrupts:
. = 0x200
_machine_check_pSeries:
HMT_MEDIUM
- mtspr SPRN_SPRG1,r13 /* save r13 */
+ mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
. = 0x300
.globl data_access_pSeries
data_access_pSeries:
HMT_MEDIUM
- mtspr SPRN_SPRG1,r13
+ mtspr SPRN_SPRG_SCRATCH0,r13
BEGIN_FTR_SECTION
- mtspr SPRN_SPRG2,r12
- mfspr r13,SPRN_DAR
- mfspr r12,SPRN_DSISR
- srdi r13,r13,60
- rlwimi r13,r12,16,0x20
- mfcr r12
- cmpwi r13,0x2c
+ mfspr r13,SPRN_SPRG_PACA
+ std r9,PACA_EXSLB+EX_R9(r13)
+ std r10,PACA_EXSLB+EX_R10(r13)
+ mfspr r10,SPRN_DAR
+ mfspr r9,SPRN_DSISR
+ srdi r10,r10,60
+ rlwimi r10,r9,16,0x20
+ mfcr r9
+ cmpwi r10,0x2c
beq do_stab_bolted_pSeries
- mtcrf 0x80,r12
- mfspr r12,SPRN_SPRG2
-END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
+ ld r10,PACA_EXSLB+EX_R10(r13)
+ std r11,PACA_EXGEN+EX_R11(r13)
+ ld r11,PACA_EXSLB+EX_R9(r13)
+ std r12,PACA_EXGEN+EX_R12(r13)
+ mfspr r12,SPRN_SPRG_SCRATCH0
+ std r10,PACA_EXGEN+EX_R10(r13)
+ std r11,PACA_EXGEN+EX_R9(r13)
+ std r12,PACA_EXGEN+EX_R13(r13)
+ EXCEPTION_PROLOG_PSERIES_1(data_access_common)
+FTR_SECTION_ELSE
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common)
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_SLB)
. = 0x380
.globl data_access_slb_pSeries
data_access_slb_pSeries:
HMT_MEDIUM
- mtspr SPRN_SPRG1,r13
- mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
+ mtspr SPRN_SPRG_SCRATCH0,r13
+ mfspr r13,SPRN_SPRG_PACA /* get paca address into r13 */
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_DAR
std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
@@ -91,7 +91,7 @@ data_access_slb_pSeries:
std r10,PACA_EXSLB+EX_R10(r13)
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
- mfspr r10,SPRN_SPRG1
+ mfspr r10,SPRN_SPRG_SCRATCH0
std r10,PACA_EXSLB+EX_R13(r13)
mfspr r12,SPRN_SRR1 /* and SRR1 */
#ifndef CONFIG_RELOCATABLE
@@ -115,8 +115,8 @@ data_access_slb_pSeries:
.globl instruction_access_slb_pSeries
instruction_access_slb_pSeries:
HMT_MEDIUM
- mtspr SPRN_SPRG1,r13
- mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
+ mtspr SPRN_SPRG_SCRATCH0,r13
+ mfspr r13,SPRN_SPRG_PACA /* get paca address into r13 */
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
@@ -129,7 +129,7 @@ instruction_access_slb_pSeries:
std r10,PACA_EXSLB+EX_R10(r13)
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
- mfspr r10,SPRN_SPRG1
+ mfspr r10,SPRN_SPRG_SCRATCH0
std r10,PACA_EXSLB+EX_R13(r13)
mfspr r12,SPRN_SRR1 /* and SRR1 */
#ifndef CONFIG_RELOCATABLE
@@ -159,7 +159,7 @@ BEGIN_FTR_SECTION
beq- 1f
END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
mr r9,r13
- mfspr r13,SPRN_SPRG3
+ mfspr r13,SPRN_SPRG_PACA
mfspr r11,SPRN_SRR0
ld r12,PACAKBASE(r13)
ld r10,PACAKMSR(r13)
@@ -228,15 +228,17 @@ masked_interrupt:
rotldi r10,r10,16
mtspr SPRN_SRR1,r10
ld r10,PACA_EXGEN+EX_R10(r13)
- mfspr r13,SPRN_SPRG1
+ mfspr r13,SPRN_SPRG_SCRATCH0
rfid
b .
.align 7
do_stab_bolted_pSeries:
- mtcrf 0x80,r12
- mfspr r12,SPRN_SPRG2
- EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
+ std r11,PACA_EXSLB+EX_R11(r13)
+ std r12,PACA_EXSLB+EX_R12(r13)
+ mfspr r10,SPRN_SPRG_SCRATCH0
+ std r10,PACA_EXSLB+EX_R13(r13)
+ EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted)
#ifdef CONFIG_PPC_PSERIES
/*
@@ -246,14 +248,14 @@ do_stab_bolted_pSeries:
.align 7
system_reset_fwnmi:
HMT_MEDIUM
- mtspr SPRN_SPRG1,r13 /* save r13 */
+ mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
.globl machine_check_fwnmi
.align 7
machine_check_fwnmi:
HMT_MEDIUM
- mtspr SPRN_SPRG1,r13 /* save r13 */
+ mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
#endif /* CONFIG_PPC_PSERIES */
@@ -268,7 +270,7 @@ slb_miss_user_pseries:
std r10,PACA_EXGEN+EX_R10(r13)
std r11,PACA_EXGEN+EX_R11(r13)
std r12,PACA_EXGEN+EX_R12(r13)
- mfspr r10,SPRG1
+ mfspr r10,SPRG_SCRATCH0
ld r11,PACA_EXSLB+EX_R9(r13)
ld r12,PACA_EXSLB+EX_R3(r13)
std r10,PACA_EXGEN+EX_R13(r13)
@@ -729,6 +731,11 @@ BEGIN_FTR_SECTION
bne- do_ste_alloc /* If so handle it */
END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
+ clrrdi r11,r1,THREAD_SHIFT
+ lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
+ andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
+ bne 77f /* then don't call hash_page now */
+
/*
* On iSeries, we soft-disable interrupts here, then
* hard-enable interrupts so that the hash_page code can spin on
@@ -833,6 +840,20 @@ handle_page_fault:
bl .low_hash_fault
b .ret_from_except
+/*
+ * We come here as a result of a DSI at a point where we don't want
+ * to call hash_page, such as when we are accessing memory (possibly
+ * user memory) inside a PMU interrupt that occurred while interrupts
+ * were soft-disabled. We want to invoke the exception handler for
+ * the access, or panic if there isn't a handler.
+ */
+77: bl .save_nvgprs
+ mr r4,r3
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ li r5,SIGSEGV
+ bl .bad_page_fault
+ b .ret_from_except
+
/* here we have a segment miss */
do_ste_alloc:
bl .ste_allocate /* try to insert stab entry */
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