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powerpc: Turn syscall handler into macros 

This turns the syscall handler into macros as we are going to want to reuse
them again later.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2012-11-02 17:16:01 +11:00 committed by Benjamin Herrenschmidt
parent 61e2390ede
commit 742415d6b6
1 changed files with 40 additions and 23 deletions
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63
arch/powerpc/kernel/exceptions-64s.S
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@ -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)