This turns the syscall handler into macros as we are going to want to reuse
them again later.
Signed-off-by: Matt Evans <m...@ozlabs.org>
Signed-off-by: Michael Neuling <mi...@neuling.org>
---
arch/powerpc/kernel/exceptions-64s.S | 63 +++++++++++++++++++++-------------
1 file changed, 40 insertions(+), 23 deletions(-)
diff --git a/arch/powerpc/kernel/exceptions-64s.S
b/arch/powerpc/kernel/exceptions-64s.S
index 0969b7f..85b3c7e 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -25,6 +25,43 @@
* 0x7000 - 0x7fff : FWNMI data area
* 0x8000 - : Early init and support code
*/
+ /* Syscall routine is used twice, in reloc-off and reloc-on paths */
+#define SYSCALL_PSERIES_1 \
+BEGIN_FTR_SECTION \
+ cmpdi r0,0x1ebe ; \
+ beq- 1f ; \
+END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
+ mr r9,r13 ; \
+ GET_PACA(r13) ; \
+ mfspr r11,SPRN_SRR0 ; \
+0:
+
+#define SYSCALL_PSERIES_2_RFID \
+ mfspr r12,SPRN_SRR1 ; \
+ ld r10,PACAKBASE(r13) ; \
+ LOAD_HANDLER(r10, system_call_entry) ; \
+ mtspr SPRN_SRR0,r10 ; \
+ ld r10,PACAKMSR(r13) ; \
+ mtspr SPRN_SRR1,r10 ; \
+ rfid ; \
+ b . ; /* prevent speculative execution */
+
+#define SYSCALL_PSERIES_3 \
+ /* Fast LE/BE switch system call */ \
+1: mfspr r12,SPRN_SRR1 ; \
+ xori r12,r12,MSR_LE ; \
+ mtspr SPRN_SRR1,r12 ; \
+ rfid ; /* return to userspace */ \
+ b . ; \
+2: mfspr r12,SPRN_SRR1 ; \
+ andi. r12,r12,MSR_PR ; \
+ bne 0b ; \
+ mtspr SPRN_SRR0,r3 ; \
+ mtspr SPRN_SRR1,r4 ; \
+ mtspr SPRN_SDR1,r5 ; \
+ rfid ; \
+ b . ; /* prevent speculative execution */
+
/*
* This is the start of the interrupt handlers for pSeries
@@ -207,31 +244,11 @@ system_call_pSeries:
KVMTEST(0xc00)
GET_SCRATCH0(r13)
#endif
-BEGIN_FTR_SECTION
- cmpdi r0,0x1ebe
- beq- 1f
-END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
- mr r9,r13
- GET_PACA(r13)
- mfspr r11,SPRN_SRR0
- mfspr r12,SPRN_SRR1
- ld r10,PACAKBASE(r13)
- LOAD_HANDLER(r10, system_call_entry)
- mtspr SPRN_SRR0,r10
- ld r10,PACAKMSR(r13)
- mtspr SPRN_SRR1,r10
- rfid
- b . /* prevent speculative execution */
-
+ SYSCALL_PSERIES_1
+ SYSCALL_PSERIES_2_RFID
+ SYSCALL_PSERIES_3
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
-/* Fast LE/BE switch system call */
-1: mfspr r12,SPRN_SRR1
- xori r12,r12,MSR_LE
- mtspr SPRN_SRR1,r12
- rfid /* return to userspace */
- b .
-
STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
--
1.7.9.5
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