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powerpc/64s: Consolidate System Call 0xc00 interrupt

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Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2016-09-21 17:43:44 +10:00 committed by Michael Ellerman
parent 341215dc12
commit d807ad37e8
1 changed files with 61 additions and 60 deletions
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121
arch/powerpc/kernel/exceptions-64s.S
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@ -77,59 +77,6 @@ OPEN_TEXT_SECTION(0x7000)
USE_FIXED_SECTION(real_vectors)
#define LOAD_SYSCALL_HANDLER(reg) \
ld reg,PACAKBASE(r13); \
ori reg,reg,(ABS_ADDR(system_call_common))@l;
/* 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 ; \
LOAD_SYSCALL_HANDLER(r10) ; \
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 . ; /* prevent speculative execution */
#if defined(CONFIG_RELOCATABLE)
/*
* We can't branch directly so we do it via the CTR which
* is volatile across system calls.
*/
#define SYSCALL_PSERIES_2_DIRECT \
LOAD_SYSCALL_HANDLER(r12) ; \
mtctr r12 ; \
mfspr r12,SPRN_SRR1 ; \
li r10,MSR_RI ; \
mtmsrd r10,1 ; \
bctr ;
#else
/* We can branch directly */
#define SYSCALL_PSERIES_2_DIRECT \
mfspr r12,SPRN_SRR1 ; \
li r10,MSR_RI ; \
mtmsrd r10,1 ; /* Set RI (EE=0) */ \
b system_call_common ;
#endif
/*
* This is the start of the interrupt handlers for pSeries
* This code runs with relocation off.
@ -864,6 +811,59 @@ TRAMP_KVM(PACA_EXGEN, 0xb00)
EXC_COMMON(trap_0b_common, 0xb00, unknown_exception)
#define LOAD_SYSCALL_HANDLER(reg) \
ld reg,PACAKBASE(r13); \
ori reg,reg,(ABS_ADDR(system_call_common))@l;
/* 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 ; \
LOAD_SYSCALL_HANDLER(r10) ; \
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 . ; /* prevent speculative execution */
#if defined(CONFIG_RELOCATABLE)
/*
* We can't branch directly so we do it via the CTR which
* is volatile across system calls.
*/
#define SYSCALL_PSERIES_2_DIRECT \
LOAD_SYSCALL_HANDLER(r12) ; \
mtctr r12 ; \
mfspr r12,SPRN_SRR1 ; \
li r10,MSR_RI ; \
mtmsrd r10,1 ; \
bctr ;
#else
/* We can branch directly */
#define SYSCALL_PSERIES_2_DIRECT \
mfspr r12,SPRN_SRR1 ; \
li r10,MSR_RI ; \
mtmsrd r10,1 ; /* Set RI (EE=0) */ \
b system_call_common ;
#endif
EXC_REAL_BEGIN(system_call, 0xc00, 0xd00)
/*
* If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems
@ -891,8 +891,16 @@ EXC_REAL_BEGIN(system_call, 0xc00, 0xd00)
SYSCALL_PSERIES_3
EXC_REAL_END(system_call, 0xc00, 0xd00)
EXC_VIRT_BEGIN(system_call, 0x4c00, 0x4d00)
HMT_MEDIUM
SYSCALL_PSERIES_1
SYSCALL_PSERIES_2_DIRECT
SYSCALL_PSERIES_3
EXC_VIRT_END(system_call, 0x4c00, 0x4d00)
TRAMP_KVM(PACA_EXGEN, 0xc00)
EXC_REAL(single_step, 0xd00, 0xe00)
TRAMP_KVM(PACA_EXGEN, 0xd00)
@ -1240,13 +1248,6 @@ EXC_COMMON(altivec_assist_common, 0x1700, unknown_exception)
* come here.
*/
EXC_VIRT_BEGIN(system_call, 0x4c00, 0x4d00)
HMT_MEDIUM
SYSCALL_PSERIES_1
SYSCALL_PSERIES_2_DIRECT
SYSCALL_PSERIES_3
EXC_VIRT_END(system_call, 0x4c00, 0x4d00)
EXC_VIRT(single_step, 0x4d00, 0x4e00, 0xd00)
EXC_VIRT_BEGIN(unused, 0x4e00, 0x4e20)