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linux_dsm_epyc7002/arch/powerpc/kernel/exceptions-64s.S
Michael Neuling 6a404806df powerpc: Avoid link stack corruption in MMU on syscall entry path 
Currently we use the link register to branch up high in the early MMU on
syscall entry path.  Unfortunately, this trashes the link stack as the
address we are going to is not associated with the earlier mflr.

This patch simply converts us to used the count register (volatile over
syscalls anyway) instead.  This is much better at predicting in this
scenario and doesn't trash link stack causing a bunch of additional
branch mispredicts later.  Benchmarking this on POWER8 saves a bunch of
cycles on Anton's null syscall benchmark here:
   http://ozlabs.org/~anton/junkcode/null_syscall.c

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-03-05 16:56:28 +11:00

1531 lines
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/*
* This file contains the 64-bit "server" PowerPC variant
* of the low level exception handling including exception
* vectors, exception return, part of the slb and stab
* handling and other fixed offset specific things.
*
* This file is meant to be #included from head_64.S due to
* position dependent assembly.
*
* Most of this originates from head_64.S and thus has the same
* copyright history.
*
*/
#include <asm/hw_irq.h>
#include <asm/exception-64s.h>
#include <asm/ptrace.h>
/*
* We layout physical memory as follows:
* 0x0000 - 0x00ff : Secondary processor spin code
* 0x0100 - 0x17ff : pSeries Interrupt prologs
* 0x1800 - 0x4000 : interrupt support common interrupt prologs
* 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1
* 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1
* 0x7000 - 0x7fff : FWNMI data area
* 0x8000 - 0x8fff : Initial (CPU0) segment table
* 0x9000 - : 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 */
#if defined(CONFIG_RELOCATABLE)
/*
* We can't branch directly; in the direct case we use LR
* and system_call_entry restores LR. (We thus need to move
* LR to r10 in the RFID case too.)
*/
#define SYSCALL_PSERIES_2_DIRECT \
mflr r10 ; \
ld r12,PACAKBASE(r13) ; \
LOAD_HANDLER(r12, system_call_entry_direct) ; \
mtctr r12 ; \
mfspr r12,SPRN_SRR1 ; \
/* Re-use of r13... No spare regs to do this */ \
li r13,MSR_RI ; \
mtmsrd r13,1 ; \
GET_PACA(r13) ; /* get r13 back */ \
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_entry_direct ;
#endif
/*
* This is the start of the interrupt handlers for pSeries
* This code runs with relocation off.
* Code from here to __end_interrupts gets copied down to real
* address 0x100 when we are running a relocatable kernel.
* Therefore any relative branches in this section must only
* branch to labels in this section.
*/
. = 0x100
.globl __start_interrupts
__start_interrupts:
.globl system_reset_pSeries;
system_reset_pSeries:
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
#ifdef CONFIG_PPC_P7_NAP
BEGIN_FTR_SECTION
/* Running native on arch 2.06 or later, check if we are
* waking up from nap. We only handle no state loss and
* supervisor state loss. We do -not- handle hypervisor
* state loss at this time.
*/
mfspr r13,SPRN_SRR1
rlwinm. r13,r13,47-31,30,31
beq 9f
/* waking up from powersave (nap) state */
cmpwi cr1,r13,2
/* Total loss of HV state is fatal, we could try to use the
* PIR to locate a PACA, then use an emergency stack etc...
* but for now, let's just stay stuck here
*/
bgt cr1,.
GET_PACA(r13)
#ifdef CONFIG_KVM_BOOK3S_64_HV
li r0,KVM_HWTHREAD_IN_KERNEL
stb r0,HSTATE_HWTHREAD_STATE(r13)
/* Order setting hwthread_state vs. testing hwthread_req */
sync
lbz r0,HSTATE_HWTHREAD_REQ(r13)
cmpwi r0,0
beq 1f
b kvm_start_guest
1:
#endif
beq cr1,2f
b .power7_wakeup_noloss
2: b .power7_wakeup_loss
9:
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
#endif /* CONFIG_PPC_P7_NAP */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
NOTEST, 0x100)
. = 0x200
machine_check_pSeries_1:
/* This is moved out of line as it can be patched by FW, but
* some code path might still want to branch into the original
* vector
*/
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_0(PACA_EXMC)
b machine_check_pSeries_0
. = 0x300
.globl data_access_pSeries
data_access_pSeries:
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
BEGIN_FTR_SECTION
b data_access_check_stab
data_access_not_stab:
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
KVMTEST, 0x300)
. = 0x380
.globl data_access_slb_pSeries
data_access_slb_pSeries:
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXSLB)
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_DAR
#ifdef __DISABLED__
/* Keep that around for when we re-implement dynamic VSIDs */
cmpdi r3,0
bge slb_miss_user_pseries
#endif /* __DISABLED__ */
mfspr r12,SPRN_SRR1
#ifndef CONFIG_RELOCATABLE
b .slb_miss_realmode
#else
/*
* We can't just use a direct branch to .slb_miss_realmode
* because the distance from here to there depends on where
* the kernel ends up being put.
*/
mfctr r11
ld r10,PACAKBASE(r13)
LOAD_HANDLER(r10, .slb_miss_realmode)
mtctr r10
bctr
#endif
STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
. = 0x480
.globl instruction_access_slb_pSeries
instruction_access_slb_pSeries:
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXSLB)
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
#ifdef __DISABLED__
/* Keep that around for when we re-implement dynamic VSIDs */
cmpdi r3,0
bge slb_miss_user_pseries
#endif /* __DISABLED__ */
mfspr r12,SPRN_SRR1
#ifndef CONFIG_RELOCATABLE
b .slb_miss_realmode
#else
mfctr r11
ld r10,PACAKBASE(r13)
LOAD_HANDLER(r10, .slb_miss_realmode)
mtctr r10
bctr
#endif
/* We open code these as we can't have a ". = x" (even with
* x = "." within a feature section
*/
. = 0x500;
.globl hardware_interrupt_pSeries;
.globl hardware_interrupt_hv;
hardware_interrupt_pSeries:
hardware_interrupt_hv:
BEGIN_FTR_SECTION
_MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
EXC_HV, SOFTEN_TEST_HV)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
FTR_SECTION_ELSE
_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
EXC_STD, SOFTEN_TEST_HV_201)
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer)
STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
. = 0xc00
.globl system_call_pSeries
system_call_pSeries:
HMT_MEDIUM
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
SET_SCRATCH0(r13)
GET_PACA(r13)
std r9,PACA_EXGEN+EX_R9(r13)
std r10,PACA_EXGEN+EX_R10(r13)
mfcr r9
KVMTEST(0xc00)
GET_SCRATCH0(r13)
#endif
SYSCALL_PSERIES_1
SYSCALL_PSERIES_2_RFID
SYSCALL_PSERIES_3
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
/* At 0xe??? we have a bunch of hypervisor exceptions, we branch
* out of line to handle them
*/
. = 0xe00
hv_exception_trampoline:
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b h_data_storage_hv
. = 0xe20
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b h_instr_storage_hv
. = 0xe40
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b emulation_assist_hv
. = 0xe60
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b hmi_exception_hv
. = 0xe80
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b h_doorbell_hv
/* We need to deal with the Altivec unavailable exception
* here which is at 0xf20, thus in the middle of the
* prolog code of the PerformanceMonitor one. A little
* trickery is thus necessary
*/
performance_monitor_pSeries_1:
. = 0xf00
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b performance_monitor_pSeries
altivec_unavailable_pSeries_1:
. = 0xf20
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b altivec_unavailable_pSeries
vsx_unavailable_pSeries_1:
. = 0xf40
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b vsx_unavailable_pSeries
. = 0xf60
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b tm_unavailable_pSeries
#ifdef CONFIG_CBE_RAS
STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
#endif /* CONFIG_CBE_RAS */
STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
. = 0x1500
.global denorm_exception_hv
denorm_exception_hv:
HMT_MEDIUM_PPR_DISCARD
mtspr SPRN_SPRG_HSCRATCH0,r13
EXCEPTION_PROLOG_0(PACA_EXGEN)
std r11,PACA_EXGEN+EX_R11(r13)
std r12,PACA_EXGEN+EX_R12(r13)
mfspr r9,SPRN_SPRG_HSCRATCH0
std r9,PACA_EXGEN+EX_R13(r13)
mfcr r9
#ifdef CONFIG_PPC_DENORMALISATION
mfspr r10,SPRN_HSRR1
mfspr r11,SPRN_HSRR0 /* save HSRR0 */
andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
addi r11,r11,-4 /* HSRR0 is next instruction */
bne+ denorm_assist
#endif
EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
#ifdef CONFIG_CBE_RAS
STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
#endif /* CONFIG_CBE_RAS */
STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
#ifdef CONFIG_CBE_RAS
STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
#else
. = 0x1800
#endif /* CONFIG_CBE_RAS */
/*** Out of line interrupts support ***/
.align 7
/* moved from 0x200 */
machine_check_pSeries:
.globl machine_check_fwnmi
machine_check_fwnmi:
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_0(PACA_EXMC)
machine_check_pSeries_0:
EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
/* moved from 0x300 */
data_access_check_stab:
GET_PACA(r13)
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
#ifdef CONFIG_KVM_BOOK3S_PR
lbz r9,HSTATE_IN_GUEST(r13)
rlwimi r10,r9,8,0x300
#endif
mfcr r9
cmpwi r10,0x2c
beq do_stab_bolted_pSeries
mtcrf 0x80,r9
ld r9,PACA_EXSLB+EX_R9(r13)
ld r10,PACA_EXSLB+EX_R10(r13)
b data_access_not_stab
do_stab_bolted_pSeries:
std r11,PACA_EXSLB+EX_R11(r13)
std r12,PACA_EXSLB+EX_R12(r13)
GET_SCRATCH0(r10)
std r10,PACA_EXSLB+EX_R13(r13)
EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
#ifdef CONFIG_PPC_DENORMALISATION
denorm_assist:
BEGIN_FTR_SECTION
/*
* To denormalise we need to move a copy of the register to itself.
* For POWER6 do that here for all FP regs.
*/
mfmsr r10
ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
xori r10,r10,(MSR_FE0|MSR_FE1)
mtmsrd r10
sync
fmr 0,0
fmr 1,1
fmr 2,2
fmr 3,3
fmr 4,4
fmr 5,5
fmr 6,6
fmr 7,7
fmr 8,8
fmr 9,9
fmr 10,10
fmr 11,11
fmr 12,12
fmr 13,13
fmr 14,14
fmr 15,15
fmr 16,16
fmr 17,17
fmr 18,18
fmr 19,19
fmr 20,20
fmr 21,21
fmr 22,22
fmr 23,23
fmr 24,24
fmr 25,25
fmr 26,26
fmr 27,27
fmr 28,28
fmr 29,29
fmr 30,30
fmr 31,31
FTR_SECTION_ELSE
/*
* To denormalise we need to move a copy of the register to itself.
* For POWER7 do that here for the first 32 VSX registers only.
*/
mfmsr r10
oris r10,r10,MSR_VSX@h
mtmsrd r10
sync
XVCPSGNDP(0,0,0)
XVCPSGNDP(1,1,1)
XVCPSGNDP(2,2,2)
XVCPSGNDP(3,3,3)
XVCPSGNDP(4,4,4)
XVCPSGNDP(5,5,5)
XVCPSGNDP(6,6,6)
XVCPSGNDP(7,7,7)
XVCPSGNDP(8,8,8)
XVCPSGNDP(9,9,9)
XVCPSGNDP(10,10,10)
XVCPSGNDP(11,11,11)
XVCPSGNDP(12,12,12)
XVCPSGNDP(13,13,13)
XVCPSGNDP(14,14,14)
XVCPSGNDP(15,15,15)
XVCPSGNDP(16,16,16)
XVCPSGNDP(17,17,17)
XVCPSGNDP(18,18,18)
XVCPSGNDP(19,19,19)
XVCPSGNDP(20,20,20)
XVCPSGNDP(21,21,21)
XVCPSGNDP(22,22,22)
XVCPSGNDP(23,23,23)
XVCPSGNDP(24,24,24)
XVCPSGNDP(25,25,25)
XVCPSGNDP(26,26,26)
XVCPSGNDP(27,27,27)
XVCPSGNDP(28,28,28)
XVCPSGNDP(29,29,29)
XVCPSGNDP(30,30,30)
XVCPSGNDP(31,31,31)
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
mtspr SPRN_HSRR0,r11
mtcrf 0x80,r9
ld r9,PACA_EXGEN+EX_R9(r13)
RESTORE_PPR_PACA(PACA_EXGEN, r10)
ld r10,PACA_EXGEN+EX_R10(r13)
ld r11,PACA_EXGEN+EX_R11(r13)
ld r12,PACA_EXGEN+EX_R12(r13)
ld r13,PACA_EXGEN+EX_R13(r13)
HRFID
b .
#endif
.align 7
/* moved from 0xe00 */
STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
STD_EXCEPTION_HV_OOL(0xe62, hmi_exception) /* need to flush cache ? */
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
/* moved from 0xf00 */
STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
STD_EXCEPTION_PSERIES_OOL(0xf60, tm_unavailable)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60)
/*
* An interrupt came in while soft-disabled. We set paca->irq_happened, then:
* - If it was a decrementer interrupt, we bump the dec to max and and return.
* - If it was a doorbell we return immediately since doorbells are edge
* triggered and won't automatically refire.
* - else we hard disable and return.
* This is called with r10 containing the value to OR to the paca field.
*/
#define MASKED_INTERRUPT(_H) \
masked_##_H##interrupt: \
std r11,PACA_EXGEN+EX_R11(r13); \
lbz r11,PACAIRQHAPPENED(r13); \
or r11,r11,r10; \
stb r11,PACAIRQHAPPENED(r13); \
cmpwi r10,PACA_IRQ_DEC; \
bne 1f; \
lis r10,0x7fff; \
ori r10,r10,0xffff; \
mtspr SPRN_DEC,r10; \
b 2f; \
1: cmpwi r10,PACA_IRQ_DBELL; \
beq 2f; \
mfspr r10,SPRN_##_H##SRR1; \
rldicl r10,r10,48,1; /* clear MSR_EE */ \
rotldi r10,r10,16; \
mtspr SPRN_##_H##SRR1,r10; \
2: mtcrf 0x80,r9; \
ld r9,PACA_EXGEN+EX_R9(r13); \
ld r10,PACA_EXGEN+EX_R10(r13); \
ld r11,PACA_EXGEN+EX_R11(r13); \
GET_SCRATCH0(r13); \
##_H##rfid; \
b .
MASKED_INTERRUPT()
MASKED_INTERRUPT(H)
/*
* Called from arch_local_irq_enable when an interrupt needs
* to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
* which kind of interrupt. MSR:EE is already off. We generate a
* stackframe like if a real interrupt had happened.
*
* Note: While MSR:EE is off, we need to make sure that _MSR
* in the generated frame has EE set to 1 or the exception
* handler will not properly re-enable them.
*/
_GLOBAL(__replay_interrupt)
/* We are going to jump to the exception common code which
* will retrieve various register values from the PACA which
* we don't give a damn about, so we don't bother storing them.
*/
mfmsr r12
mflr r11
mfcr r9
ori r12,r12,MSR_EE
cmpwi r3,0x900
beq decrementer_common
cmpwi r3,0x500
beq hardware_interrupt_common
BEGIN_FTR_SECTION
cmpwi r3,0xe80
beq h_doorbell_common
FTR_SECTION_ELSE
cmpwi r3,0xa00
beq doorbell_super_common
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
blr
#ifdef CONFIG_PPC_PSERIES
/*
* Vectors for the FWNMI option. Share common code.
*/
.globl system_reset_fwnmi
.align 7
system_reset_fwnmi:
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
NOTEST, 0x100)
#endif /* CONFIG_PPC_PSERIES */
#ifdef __DISABLED__
/*
* This is used for when the SLB miss handler has to go virtual,
* which doesn't happen for now anymore but will once we re-implement
* dynamic VSIDs for shared page tables
*/
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)
GET_SCRATCH0(r10)
ld r11,PACA_EXSLB+EX_R9(r13)
ld r12,PACA_EXSLB+EX_R3(r13)
std r10,PACA_EXGEN+EX_R13(r13)
std r11,PACA_EXGEN+EX_R9(r13)
std r12,PACA_EXGEN+EX_R3(r13)
clrrdi r12,r13,32
mfmsr r10
mfspr r11,SRR0 /* save SRR0 */
ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
ori r10,r10,MSR_IR|MSR_DR|MSR_RI
mtspr SRR0,r12
mfspr r12,SRR1 /* and SRR1 */
mtspr SRR1,r10
rfid
b . /* prevent spec. execution */
#endif /* __DISABLED__ */
/*
* Code from here down to __end_handlers is invoked from the
* exception prologs above. Because the prologs assemble the
* addresses of these handlers using the LOAD_HANDLER macro,
* which uses an ori instruction, these handlers must be in
* the first 64k of the kernel image.
*/
/*** Common interrupt handlers ***/
STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
/*
* Machine check is different because we use a different
* save area: PACA_EXMC instead of PACA_EXGEN.
*/
.align 7
.globl machine_check_common
machine_check_common:
EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
FINISH_NAP
DISABLE_INTS
bl .save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
bl .machine_check_exception
b .ret_from_except
STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt)
STD_EXCEPTION_COMMON(0x980, hdecrementer, .hdec_interrupt)
#ifdef CONFIG_PPC_DOORBELL
STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .doorbell_exception)
#else
STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .unknown_exception)
#endif
STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
STD_EXCEPTION_COMMON(0xe40, emulation_assist, .program_check_exception)
STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception)
#ifdef CONFIG_PPC_DOORBELL
STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .doorbell_exception)
#else
STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .unknown_exception)
#endif
STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception)
STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
STD_EXCEPTION_COMMON(0x1502, denorm, .unknown_exception)
#ifdef CONFIG_ALTIVEC
STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
#else
STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
#endif
#ifdef CONFIG_CBE_RAS
STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception)
STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception)
STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception)
#endif /* CONFIG_CBE_RAS */
/*
* Relocation-on interrupts: A subset of the interrupts can be delivered
* with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
* it. Addresses are the same as the original interrupt addresses, but
* offset by 0xc000000000004000.
* It's impossible to receive interrupts below 0x300 via this mechanism.
* KVM: None of these traps are from the guest ; anything that escalated
* to HV=1 from HV=0 is delivered via real mode handlers.
*/
/*
* This uses the standard macro, since the original 0x300 vector
* only has extra guff for STAB-based processors -- which never
* come here.
*/
STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
. = 0x4380
.globl data_access_slb_relon_pSeries
data_access_slb_relon_pSeries:
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXSLB)
EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_DAR
mfspr r12,SPRN_SRR1
#ifndef CONFIG_RELOCATABLE
b .slb_miss_realmode
#else
/*
* We can't just use a direct branch to .slb_miss_realmode
* because the distance from here to there depends on where
* the kernel ends up being put.
*/
mfctr r11
ld r10,PACAKBASE(r13)
LOAD_HANDLER(r10, .slb_miss_realmode)
mtctr r10
bctr
#endif
STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
. = 0x4480
.globl instruction_access_slb_relon_pSeries
instruction_access_slb_relon_pSeries:
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXSLB)
EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
mfspr r12,SPRN_SRR1
#ifndef CONFIG_RELOCATABLE
b .slb_miss_realmode
#else
mfctr r11
ld r10,PACAKBASE(r13)
LOAD_HANDLER(r10, .slb_miss_realmode)
mtctr r10
bctr
#endif
. = 0x4500
.globl hardware_interrupt_relon_pSeries;
.globl hardware_interrupt_relon_hv;
hardware_interrupt_relon_pSeries:
hardware_interrupt_relon_hv:
BEGIN_FTR_SECTION
_MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
FTR_SECTION_ELSE
_MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_206)
STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
. = 0x4c00
.globl system_call_relon_pSeries
system_call_relon_pSeries:
HMT_MEDIUM
SYSCALL_PSERIES_1
SYSCALL_PSERIES_2_DIRECT
SYSCALL_PSERIES_3
STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
. = 0x4e00
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b h_data_storage_relon_hv
. = 0x4e20
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b h_instr_storage_relon_hv
. = 0x4e40
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b emulation_assist_relon_hv
. = 0x4e60
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b hmi_exception_relon_hv
. = 0x4e80
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b h_doorbell_relon_hv
performance_monitor_relon_pSeries_1:
. = 0x4f00
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b performance_monitor_relon_pSeries
altivec_unavailable_relon_pSeries_1:
. = 0x4f20
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b altivec_unavailable_relon_pSeries
vsx_unavailable_relon_pSeries_1:
. = 0x4f40
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b vsx_unavailable_relon_pSeries
tm_unavailable_relon_pSeries_1:
. = 0x4f60
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b tm_unavailable_relon_pSeries
STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
#ifdef CONFIG_PPC_DENORMALISATION
. = 0x5500
b denorm_exception_hv
#endif
#ifdef CONFIG_HVC_SCOM
STD_RELON_EXCEPTION_HV(0x5600, 0x1600, maintence_interrupt)
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1600)
#endif /* CONFIG_HVC_SCOM */
STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
/* Other future vectors */
.align 7
.globl __end_interrupts
__end_interrupts:
.align 7
system_call_entry_direct:
#if defined(CONFIG_RELOCATABLE)
/* The first level prologue may have used LR to get here, saving
* orig in r10. To save hacking/ifdeffing common code, restore here.
*/
mtlr r10
#endif
system_call_entry:
b system_call_common
ppc64_runlatch_on_trampoline:
b .__ppc64_runlatch_on
/*
* Here we have detected that the kernel stack pointer is bad.
* R9 contains the saved CR, r13 points to the paca,
* r10 contains the (bad) kernel stack pointer,
* r11 and r12 contain the saved SRR0 and SRR1.
* We switch to using an emergency stack, save the registers there,
* and call kernel_bad_stack(), which panics.
*/
bad_stack:
ld r1,PACAEMERGSP(r13)
subi r1,r1,64+INT_FRAME_SIZE
std r9,_CCR(r1)
std r10,GPR1(r1)
std r11,_NIP(r1)
std r12,_MSR(r1)
mfspr r11,SPRN_DAR
mfspr r12,SPRN_DSISR
std r11,_DAR(r1)
std r12,_DSISR(r1)
mflr r10
mfctr r11
mfxer r12
std r10,_LINK(r1)
std r11,_CTR(r1)
std r12,_XER(r1)
SAVE_GPR(0,r1)
SAVE_GPR(2,r1)
ld r10,EX_R3(r3)
std r10,GPR3(r1)
SAVE_GPR(4,r1)
SAVE_4GPRS(5,r1)
ld r9,EX_R9(r3)
ld r10,EX_R10(r3)
SAVE_2GPRS(9,r1)
ld r9,EX_R11(r3)
ld r10,EX_R12(r3)
ld r11,EX_R13(r3)
std r9,GPR11(r1)
std r10,GPR12(r1)
std r11,GPR13(r1)
BEGIN_FTR_SECTION
ld r10,EX_CFAR(r3)
std r10,ORIG_GPR3(r1)
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
SAVE_8GPRS(14,r1)
SAVE_10GPRS(22,r1)
lhz r12,PACA_TRAP_SAVE(r13)
std r12,_TRAP(r1)
addi r11,r1,INT_FRAME_SIZE
std r11,0(r1)
li r12,0
std r12,0(r11)
ld r2,PACATOC(r13)
ld r11,exception_marker@toc(r2)
std r12,RESULT(r1)
std r11,STACK_FRAME_OVERHEAD-16(r1)
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl .kernel_bad_stack
b 1b
/*
* Here r13 points to the paca, r9 contains the saved CR,
* SRR0 and SRR1 are saved in r11 and r12,
* r9 - r13 are saved in paca->exgen.
*/
.align 7
.globl data_access_common
data_access_common:
mfspr r10,SPRN_DAR
std r10,PACA_EXGEN+EX_DAR(r13)
mfspr r10,SPRN_DSISR
stw r10,PACA_EXGEN+EX_DSISR(r13)
EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
DISABLE_INTS
ld r12,_MSR(r1)
ld r3,PACA_EXGEN+EX_DAR(r13)
lwz r4,PACA_EXGEN+EX_DSISR(r13)
li r5,0x300
b .do_hash_page /* Try to handle as hpte fault */
.align 7
.globl h_data_storage_common
h_data_storage_common:
mfspr r10,SPRN_HDAR
std r10,PACA_EXGEN+EX_DAR(r13)
mfspr r10,SPRN_HDSISR
stw r10,PACA_EXGEN+EX_DSISR(r13)
EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .unknown_exception
b .ret_from_except
.align 7
.globl instruction_access_common
instruction_access_common:
EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
DISABLE_INTS
ld r12,_MSR(r1)
ld r3,_NIP(r1)
andis. r4,r12,0x5820
li r5,0x400
b .do_hash_page /* Try to handle as hpte fault */
STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception)
/*
* Here is the common SLB miss user that is used when going to virtual
* mode for SLB misses, that is currently not used
*/
#ifdef __DISABLED__
.align 7
.globl slb_miss_user_common
slb_miss_user_common:
mflr r10
std r3,PACA_EXGEN+EX_DAR(r13)
stw r9,PACA_EXGEN+EX_CCR(r13)
std r10,PACA_EXGEN+EX_LR(r13)
std r11,PACA_EXGEN+EX_SRR0(r13)
bl .slb_allocate_user
ld r10,PACA_EXGEN+EX_LR(r13)
ld r3,PACA_EXGEN+EX_R3(r13)
lwz r9,PACA_EXGEN+EX_CCR(r13)
ld r11,PACA_EXGEN+EX_SRR0(r13)
mtlr r10
beq- slb_miss_fault
andi. r10,r12,MSR_RI /* check for unrecoverable exception */
beq- unrecov_user_slb
mfmsr r10
.machine push
.machine "power4"
mtcrf 0x80,r9
.machine pop
clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
mtmsrd r10,1
mtspr SRR0,r11
mtspr SRR1,r12
ld r9,PACA_EXGEN+EX_R9(r13)
ld r10,PACA_EXGEN+EX_R10(r13)
ld r11,PACA_EXGEN+EX_R11(r13)
ld r12,PACA_EXGEN+EX_R12(r13)
ld r13,PACA_EXGEN+EX_R13(r13)
rfid
b .
slb_miss_fault:
EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
ld r4,PACA_EXGEN+EX_DAR(r13)
li r5,0
std r4,_DAR(r1)
std r5,_DSISR(r1)
b handle_page_fault
unrecov_user_slb:
EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
DISABLE_INTS
bl .save_nvgprs
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl .unrecoverable_exception
b 1b
#endif /* __DISABLED__ */
/*
* r13 points to the PACA, r9 contains the saved CR,
* r12 contain the saved SRR1, SRR0 is still ready for return
* r3 has the faulting address
* r9 - r13 are saved in paca->exslb.
* r3 is saved in paca->slb_r3
* We assume we aren't going to take any exceptions during this procedure.
*/
_GLOBAL(slb_miss_realmode)
mflr r10
#ifdef CONFIG_RELOCATABLE
mtctr r11
#endif
stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
bl .slb_allocate_realmode
/* All done -- return from exception. */
ld r10,PACA_EXSLB+EX_LR(r13)
ld r3,PACA_EXSLB+EX_R3(r13)
lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
mtlr r10
andi. r10,r12,MSR_RI /* check for unrecoverable exception */
beq- 2f
.machine push
.machine "power4"
mtcrf 0x80,r9
mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
.machine pop
RESTORE_PPR_PACA(PACA_EXSLB, r9)
ld r9,PACA_EXSLB+EX_R9(r13)
ld r10,PACA_EXSLB+EX_R10(r13)
ld r11,PACA_EXSLB+EX_R11(r13)
ld r12,PACA_EXSLB+EX_R12(r13)
ld r13,PACA_EXSLB+EX_R13(r13)
rfid
b . /* prevent speculative execution */
2: mfspr r11,SPRN_SRR0
ld r10,PACAKBASE(r13)
LOAD_HANDLER(r10,unrecov_slb)
mtspr SPRN_SRR0,r10
ld r10,PACAKMSR(r13)
mtspr SPRN_SRR1,r10
rfid
b .
unrecov_slb:
EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
DISABLE_INTS
bl .save_nvgprs
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl .unrecoverable_exception
b 1b
#ifdef CONFIG_PPC_970_NAP
power4_fixup_nap:
andc r9,r9,r10
std r9,TI_LOCAL_FLAGS(r11)
ld r10,_LINK(r1) /* make idle task do the */
std r10,_NIP(r1) /* equivalent of a blr */
blr
#endif
.align 7
.globl alignment_common
alignment_common:
mfspr r10,SPRN_DAR
std r10,PACA_EXGEN+EX_DAR(r13)
mfspr r10,SPRN_DSISR
stw r10,PACA_EXGEN+EX_DSISR(r13)
EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
ld r3,PACA_EXGEN+EX_DAR(r13)
lwz r4,PACA_EXGEN+EX_DSISR(r13)
std r3,_DAR(r1)
std r4,_DSISR(r1)
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .alignment_exception
b .ret_from_except
.align 7
.globl program_check_common
program_check_common:
EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .program_check_exception
b .ret_from_except
.align 7
.globl fp_unavailable_common
fp_unavailable_common:
EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
bne 1f /* if from user, just load it up */
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .kernel_fp_unavailable_exception
BUG_OPCODE
1:
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
BEGIN_FTR_SECTION
/* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
* transaction), go do TM stuff
*/
rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
bne- 2f
END_FTR_SECTION_IFSET(CPU_FTR_TM)
#endif
bl .load_up_fpu
b fast_exception_return
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2: /* User process was in a transaction */
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .fp_unavailable_tm
b .ret_from_except
#endif
.align 7
.globl altivec_unavailable_common
altivec_unavailable_common:
EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
beq 1f
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
BEGIN_FTR_SECTION_NESTED(69)
/* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
* transaction), go do TM stuff
*/
rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
bne- 2f
END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
#endif
bl .load_up_altivec
b fast_exception_return
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2: /* User process was in a transaction */
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .altivec_unavailable_tm
b .ret_from_except
#endif
1:
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .altivec_unavailable_exception
b .ret_from_except
.align 7
.globl vsx_unavailable_common
vsx_unavailable_common:
EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
beq 1f
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
BEGIN_FTR_SECTION_NESTED(69)
/* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
* transaction), go do TM stuff
*/
rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
bne- 2f
END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
#endif
b .load_up_vsx
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2: /* User process was in a transaction */
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .vsx_unavailable_tm
b .ret_from_except
#endif
1:
END_FTR_SECTION_IFSET(CPU_FTR_VSX)
#endif
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .vsx_unavailable_exception
b .ret_from_except
.align 7
.globl tm_unavailable_common
tm_unavailable_common:
EXCEPTION_PROLOG_COMMON(0xf60, PACA_EXGEN)
bl .save_nvgprs
DISABLE_INTS
addi r3,r1,STACK_FRAME_OVERHEAD
bl .tm_unavailable_exception
b .ret_from_except
.align 7
.globl __end_handlers
__end_handlers:
/* Equivalents to the above handlers for relocation-on interrupt vectors */
STD_RELON_EXCEPTION_HV_OOL(0xe00, h_data_storage)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe00)
STD_RELON_EXCEPTION_HV_OOL(0xe20, h_instr_storage)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe20)
STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe40)
STD_RELON_EXCEPTION_HV_OOL(0xe60, hmi_exception)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe60)
MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe80)
STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, tm_unavailable)
#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
/*
* Data area reserved for FWNMI option.
* This address (0x7000) is fixed by the RPA.
*/
.= 0x7000
.globl fwnmi_data_area
fwnmi_data_area:
/* pseries and powernv need to keep the whole page from
* 0x7000 to 0x8000 free for use by the firmware
*/
. = 0x8000
#endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
/* Space for CPU0's segment table */
.balign 4096
.globl initial_stab
initial_stab:
.space 4096
#ifdef CONFIG_PPC_POWERNV
_GLOBAL(opal_mc_secondary_handler)
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
GET_PACA(r13)
clrldi r3,r3,2
tovirt(r3,r3)
std r3,PACA_OPAL_MC_EVT(r13)
ld r13,OPAL_MC_SRR0(r3)
mtspr SPRN_SRR0,r13
ld r13,OPAL_MC_SRR1(r3)
mtspr SPRN_SRR1,r13
ld r3,OPAL_MC_GPR3(r3)
GET_SCRATCH0(r13)
b machine_check_pSeries
#endif /* CONFIG_PPC_POWERNV */
/*
* Hash table stuff
*/
.align 7
_STATIC(do_hash_page)
std r3,_DAR(r1)
std r4,_DSISR(r1)
andis. r0,r4,0xa410 /* weird error? */
bne- handle_page_fault /* if not, try to insert a HPTE */
andis. r0,r4,DSISR_DABRMATCH@h
bne- handle_dabr_fault
BEGIN_FTR_SECTION
andis. r0,r4,0x0020 /* Is it a segment table fault? */
bne- do_ste_alloc /* If so handle it */
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
CURRENT_THREAD_INFO(r11, r1)
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 */
/*
* We need to set the _PAGE_USER bit if MSR_PR is set or if we are
* accessing a userspace segment (even from the kernel). We assume
* kernel addresses always have the high bit set.
*/
rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
orc r0,r12,r0 /* MSR_PR | ~high_bit */
rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
ori r4,r4,1 /* add _PAGE_PRESENT */
rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
/*
* r3 contains the faulting address
* r4 contains the required access permissions
* r5 contains the trap number
*
* at return r3 = 0 for success, 1 for page fault, negative for error
*/
bl .hash_page /* build HPTE if possible */
cmpdi r3,0 /* see if hash_page succeeded */
/* Success */
beq fast_exc_return_irq /* Return from exception on success */
/* Error */
blt- 13f
/* Here we have a page fault that hash_page can't handle. */
handle_page_fault:
11: ld r4,_DAR(r1)
ld r5,_DSISR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
bl .do_page_fault
cmpdi r3,0
beq+ 12f
bl .save_nvgprs
mr r5,r3
addi r3,r1,STACK_FRAME_OVERHEAD
lwz r4,_DAR(r1)
bl .bad_page_fault
b .ret_from_except
/* We have a data breakpoint exception - handle it */
handle_dabr_fault:
bl .save_nvgprs
ld r4,_DAR(r1)
ld r5,_DSISR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
bl .do_break
12: b .ret_from_except_lite
/* We have a page fault that hash_page could handle but HV refused
* the PTE insertion
*/
13: bl .save_nvgprs
mr r5,r3
addi r3,r1,STACK_FRAME_OVERHEAD
ld r4,_DAR(r1)
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 */
cmpdi r3,0
bne- handle_page_fault
b fast_exception_return
/*
* r13 points to the PACA, r9 contains the saved CR,
* r11 and r12 contain the saved SRR0 and SRR1.
* r9 - r13 are saved in paca->exslb.
* We assume we aren't going to take any exceptions during this procedure.
* We assume (DAR >> 60) == 0xc.
*/
.align 7
_GLOBAL(do_stab_bolted)
stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */
/* Hash to the primary group */
ld r10,PACASTABVIRT(r13)
mfspr r11,SPRN_DAR
srdi r11,r11,28
rldimi r10,r11,7,52 /* r10 = first ste of the group */
/* Calculate VSID */
/* This is a kernel address, so protovsid = ESID | 1 << 37 */
li r9,0x1
rldimi r11,r9,(CONTEXT_BITS + USER_ESID_BITS),0
ASM_VSID_SCRAMBLE(r11, r9, 256M)
rldic r9,r11,12,16 /* r9 = vsid << 12 */
/* Search the primary group for a free entry */
1: ld r11,0(r10) /* Test valid bit of the current ste */
andi. r11,r11,0x80
beq 2f
addi r10,r10,16
andi. r11,r10,0x70
bne 1b
/* Stick for only searching the primary group for now. */
/* At least for now, we use a very simple random castout scheme */
/* Use the TB as a random number ; OR in 1 to avoid entry 0 */
mftb r11
rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
ori r11,r11,0x10
/* r10 currently points to an ste one past the group of interest */
/* make it point to the randomly selected entry */
subi r10,r10,128
or r10,r10,r11 /* r10 is the entry to invalidate */
isync /* mark the entry invalid */
ld r11,0(r10)
rldicl r11,r11,56,1 /* clear the valid bit */
rotldi r11,r11,8
std r11,0(r10)
sync
clrrdi r11,r11,28 /* Get the esid part of the ste */
slbie r11
2: std r9,8(r10) /* Store the vsid part of the ste */
eieio
mfspr r11,SPRN_DAR /* Get the new esid */
clrrdi r11,r11,28 /* Permits a full 32b of ESID */
ori r11,r11,0x90 /* Turn on valid and kp */
std r11,0(r10) /* Put new entry back into the stab */
sync
/* All done -- return from exception. */
lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */
andi. r10,r12,MSR_RI
beq- unrecov_slb
mtcrf 0x80,r9 /* restore CR */
mfmsr r10
clrrdi r10,r10,2
mtmsrd r10,1
mtspr SPRN_SRR0,r11
mtspr SPRN_SRR1,r12
ld r9,PACA_EXSLB+EX_R9(r13)
ld r10,PACA_EXSLB+EX_R10(r13)
ld r11,PACA_EXSLB+EX_R11(r13)
ld r12,PACA_EXSLB+EX_R12(r13)
ld r13,PACA_EXSLB+EX_R13(r13)
rfid
b . /* prevent speculative execution */
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