/*
* 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>
#include <asm/cpuidle.h>
#include <asm/head-64.h>
/*
* There are a few constraints to be concerned with.
* - Real mode exceptions code/data must be located at their physical location.
* - Virtual mode exceptions must be mapped at their 0xc000... location.
* - Fixed location code must not call directly beyond the __end_interrupts
* area when built with CONFIG_RELOCATABLE. LOAD_HANDLER / bctr sequence
* must be used.
* - LOAD_HANDLER targets must be within first 64K of physical 0 /
* virtual 0xc00...
* - Conditional branch targets must be within +/-32K of caller.
*
* "Virtual exceptions" run with relocation on (MSR_IR=1, MSR_DR=1), and
* therefore don't have to run in physically located code or rfid to
* virtual mode kernel code. However on relocatable kernels they do have
* to branch to KERNELBASE offset because the rest of the kernel (outside
* the exception vectors) may be located elsewhere.
*
* Virtual exceptions correspond with physical, except their entry points
* are offset by 0xc000000000000000 and also tend to get an added 0x4000
* offset applied. Virtual exceptions are enabled with the Alternate
* Interrupt Location (AIL) bit set in the LPCR. However this does not
* guarantee they will be delivered virtually. Some conditions (see the ISA)
* cause exceptions to be delivered in real mode.
*
* It's impossible to receive interrupts below 0x300 via AIL.
*
* KVM: None of the virtual exceptions are from the guest. Anything that
* escalated to HV=1 from HV=0 is delivered via real mode handlers.
*
*
* We layout physical memory as follows:
* 0x0000 - 0x00ff : Secondary processor spin code
* 0x0100 - 0x18ff : Real mode pSeries interrupt vectors
* 0x1900 - 0x3fff : Real mode trampolines
* 0x4000 - 0x58ff : Relon (IR=1,DR=1) mode pSeries interrupt vectors
* 0x5900 - 0x6fff : Relon mode trampolines
* 0x7000 - 0x7fff : FWNMI data area
* 0x8000 - .... : Common interrupt handlers, remaining early
* setup code, rest of kernel.
*
* We could reclaim 0x4000-0x42ff for real mode trampolines if the space
* is necessary. Until then it's more consistent to explicitly put VIRT_NONE
* vectors there.
*/
OPEN_FIXED_SECTION(real_vectors, 0x0100, 0x1900)
OPEN_FIXED_SECTION(real_trampolines, 0x1900, 0x4000)
OPEN_FIXED_SECTION(virt_vectors, 0x4000, 0x5900)
OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000)
#if defined([31mCONFIG_PPC_PSERIES[0m) || defined([31mCONFIG_PPC_POWERNV[0m)
/*
* Data area reserved for FWNMI option.
* This address (0x7000) is fixed by the RPA.
* pseries and powernv need to keep the whole page from
* 0x7000 to 0x8000 free for use by the firmware
*/
ZERO_FIXED_SECTION(fwnmi_page, 0x7000, 0x8000)
OPEN_TEXT_SECTION(0x8000)
#else
OPEN_TEXT_SECTION(0x7000)
#endif
USE_FIXED_SECTION(real_vectors)
/*
* 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.
*/
.globl __start_interrupts
__start_interrupts:
/* No virt vectors corresponding with 0x0..0x100 */
EXC_VIRT_NONE(0x4000, 0x4100)
#ifdef [31mCONFIG_PPC_P7_NAP[0m
/*
* If running native on arch 2.06 or later, check if we are waking up
* from nap/sleep/winkle, and branch to idle handler.
*/
#define IDLETEST(n) \
BEGIN_FTR_SECTION ; \
mfspr r10,SPRN_SRR1 ; \
rlwinm. r10,r10,47-31,30,31 ; \
beq- 1f ; \
cmpwi cr3,r10,2 ; \
BRANCH_TO_COMMON(r10, system_reset_idle_common) ; \
1: \
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
#else
#define IDLETEST NOTEST
#endif
EXC_REAL_BEGIN(system_reset, 0x100, 0x200)
SET_SCRATCH0(r13)
GET_PACA(r13)
clrrdi r13,r13,1 /* Last bit of HSPRG0 is set if waking from winkle */
EXCEPTION_PROLOG_PSERIES_PACA(PACA_EXGEN, system_reset_common, EXC_STD,
IDLETEST, 0x100)
EXC_REAL_END(system_reset, 0x100, 0x200)
EXC_VIRT_NONE(0x4100, 0x4200)
#ifdef [31mCONFIG_PPC_P7_NAP[0m
EXC_COMMON_BEGIN(system_reset_idle_common)
BEGIN_FTR_SECTION
GET_PACA(r13) /* Restore HSPRG0 to get the winkle bit in r13 */
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
bl pnv_restore_hyp_resource
li r0,PNV_THREAD_RUNNING
stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */
#ifdef [31mCONFIG_KVM_BOOK3S_HV_POSSIBLE[0m
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
/* Return SRR1 from power7_nap() */
mfspr r3,SPRN_SRR1
blt cr3,2f
b pnv_wakeup_loss
2: b pnv_wakeup_noloss
#endif
EXC_COMMON(system_reset_common, 0x100, system_reset_exception)
#ifdef [31mCONFIG_PPC_PSERIES[0m
/*
* Vectors for the FWNMI option. Share common code.
*/
TRAMP_REAL_BEGIN(system_reset_fwnmi)
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
NOTEST, 0x100)
#endif /* CONFIG_PPC_PSERIES */
EXC_REAL_BEGIN(machine_check, 0x200, 0x300)
/* 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
*/
SET_SCRATCH0(r13) /* save r13 */
/*
* Running native on arch 2.06 or later, we may wakeup from winkle
* inside machine check. If yes, then last bit of HSPRG0 would be set
* to 1. Hence clear it unconditionally.
*/
GET_PACA(r13)
clrrdi r13,r13,1
SET_PACA(r13)
EXCEPTION_PROLOG_0(PACA_EXMC)
BEGIN_FTR_SECTION
b machine_check_powernv_early
FTR_SECTION_ELSE
b machine_check_pSeries_0
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
EXC_REAL_END(machine_check, 0x200, 0x300)
EXC_VIRT_NONE(0x4200, 0x4300)
TRAMP_REAL_BEGIN(machine_check_powernv_early)
BEGIN_FTR_SECTION
EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
/*
* Register contents:
* R13 = PACA
* R9 = CR
* Original R9 to R13 is saved on PACA_EXMC
*
* Switch to mc_emergency stack and handle re-entrancy (we limit
* the nested MCE upto level 4 to avoid stack overflow).
* Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
*
* We use paca->in_mce to check whether this is the first entry or
* nested machine check. We increment paca->in_mce to track nested
* machine checks.
*
* If this is the first entry then set stack pointer to
* paca->mc_emergency_sp, otherwise r1 is already pointing to
* stack frame on mc_emergency stack.
*
* NOTE: We are here with MSR_ME=0 (off), which means we risk a
* checkstop if we get another machine check exception before we do
* rfid with MSR_ME=1.
*/
mr r11,r1 /* Save r1 */
lhz r10,PACA_IN_MCE(r13)
cmpwi r10,0 /* Are we in nested machine check */
bne 0f /* Yes, we are. */
/* First machine check entry */
ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
addi r10,r10,1 /* increment paca->in_mce */
sth r10,PACA_IN_MCE(r13)
/* Limit nested MCE to level 4 to avoid stack overflow */
cmpwi r10,4
bgt 2f /* Check if we hit limit of 4 */
std r11,GPR1(r1) /* Save r1 on the stack. */
std r11,0(r1) /* make stack chain pointer */
mfspr r11,SPRN_SRR0 /* Save SRR0 */
std r11,_NIP(r1)
mfspr r11,SPRN_SRR1 /* Save SRR1 */
std r11,_MSR(r1)
mfspr r11,SPRN_DAR /* Save DAR */
std r11,_DAR(r1)
mfspr r11,SPRN_DSISR /* Save DSISR */
std r11,_DSISR(r1)
std r9,_CCR(r1) /* Save CR in stackframe */
/* Save r9 through r13 from EXMC save area to stack frame. */
EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
mfmsr r11 /* get MSR value */
ori r11,r11,MSR_ME /* turn on ME bit */
ori r11,r11,MSR_RI /* turn on RI bit */
LOAD_HANDLER(r12, machine_check_handle_early)
1: mtspr SPRN_SRR0,r12
mtspr SPRN_SRR1,r11
rfid
b . /* prevent speculative execution */
2:
/* Stack overflow. Stay on emergency stack and panic.
* Keep the ME bit off while panic-ing, so that if we hit
* another machine check we checkstop.
*/
addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */
ld r11,PACAKMSR(r13)
LOAD_HANDLER(r12, unrecover_mce)
li r10,MSR_ME
andc r11,r11,r10 /* Turn off MSR_ME */
b 1b
b . /* prevent speculative execution */
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
TRAMP_REAL_BEGIN(machine_check_pSeries)
.globl machine_check_fwnmi
machine_check_fwnmi:
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_0(PACA_EXMC)
machine_check_pSeries_0:
EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200)
/*
* The following is essentially EXCEPTION_PROLOG_PSERIES_1 with the
* difference that MSR_RI is not enabled, because PACA_EXMC is being
* used, so nested machine check corrupts it. machine_check_common
* enables MSR_RI.
*/
ld r10,PACAKMSR(r13)
xori r10,r10,MSR_RI
mfspr r11,SPRN_SRR0
LOAD_HANDLER(r12, machine_check_common)
mtspr SPRN_SRR0,r12
mfspr r12,SPRN_SRR1
mtspr SPRN_SRR1,r10
rfid
b . /* prevent speculative execution */
TRAMP_KVM_SKIP(PACA_EXMC, 0x200)
EXC_COMMON_BEGIN(machine_check_common)
/*
* Machine check is different because we use a different
* save area: PACA_EXMC instead of PACA_EXGEN.
*/
mfspr r10,SPRN_DAR
std r10,PACA_EXMC+EX_DAR(r13)
mfspr r10,SPRN_DSISR
stw r10,PACA_EXMC+EX_DSISR(r13)
EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
FINISH_NAP
RECONCILE_IRQ_STATE(r10, r11)
ld r3,PACA_EXMC+EX_DAR(r13)
lwz r4,PACA_EXMC+EX_DSISR(r13)
/* Enable MSR_RI when finished with PACA_EXMC */
li r10,MSR_RI
mtmsrd r10,1
std r3,_DAR(r1)
std r4,_DSISR(r1)
bl save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
bl machine_check_exception
b ret_from_except
#define MACHINE_CHECK_HANDLER_WINDUP \
/* Clear MSR_RI before setting SRR0 and SRR1. */\
li r0,MSR_RI; \
mfmsr r9; /* get MSR value */ \
andc r9,r9,r0; \
mtmsrd r9,1; /* Clear MSR_RI */ \
/* Move original SRR0 and SRR1 into the respective regs */ \
ld r9,_MSR(r1); \
mtspr SPRN_SRR1,r9; \
ld r3,_NIP(r1); \
mtspr SPRN_SRR0,r3; \
ld r9,_CTR(r1); \
mtctr r9; \
ld r9,_XER(r1); \
mtxer r9; \
ld r9,_LINK(r1); \
mtlr r9; \
REST_GPR(0, r1); \
REST_8GPRS(2, r1); \
REST_GPR(10, r1); \
ld r11,_CCR(r1); \
mtcr r11; \
/* Decrement paca->in_mce. */ \
lhz r12,PACA_IN_MCE(r13); \
subi r12,r12,1; \
sth r12,PACA_IN_MCE(r13); \
REST_GPR(11, r1); \
REST_2GPRS(12, r1); \
/* restore original r1. */ \
ld r1,GPR1(r1)
/*
* Handle machine check early in real mode. We come here with
* ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
*/
EXC_COMMON_BEGIN(machine_check_handle_early)
std r0,GPR0(r1) /* Save r0 */
EXCEPTION_PROLOG_COMMON_3(0x200)
bl save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
bl machine_check_early
std r3,RESULT(r1) /* Save result */
ld r12,_MSR(r1)
#ifdef [31mCONFIG_PPC_P7_NAP[0m
/*
* Check if thread was in power saving mode. We come here when any
* of the following is true:
* a. thread wasn't in power saving mode
* b. thread was in power saving mode with no state loss,
* supervisor state loss or hypervisor state loss.
*
* Go back to nap/sleep/winkle mode again if (b) is true.
*/
rlwinm. r11,r12,47-31,30,31 /* Was it in power saving mode? */
beq 4f /* No, it wasn;t */
/* Thread was in power saving mode. Go back to nap again. */
cmpwi r11,2
blt 3f
/* Supervisor/Hypervisor state loss */
li r0,1
stb r0,PACA_NAPSTATELOST(r13)
3: bl machine_check_queue_event
MACHINE_CHECK_HANDLER_WINDUP
GET_PACA(r13)
ld r1,PACAR1(r13)
/*
* Check what idle state this CPU was in and go back to same mode
* again.
*/
lbz r3,PACA_THREAD_IDLE_STATE(r13)
cmpwi r3,PNV_THREAD_NAP
bgt 10f
IDLE_STATE_ENTER_SEQ(PPC_NAP)
/* No return */
10:
cmpwi r3,PNV_THREAD_SLEEP
bgt 2f
IDLE_STATE_ENTER_SEQ(PPC_SLEEP)
/* No return */
2:
/*
* Go back to winkle. Please note that this thread was woken up in
* machine check from winkle and have not restored the per-subcore
* state. Hence before going back to winkle, set last bit of HSPRG0
* to 1. This will make sure that if this thread gets woken up
* again at reset vector 0x100 then it will get chance to restore
* the subcore state.
*/
ori r13,r13,1
SET_PACA(r13)
IDLE_STATE_ENTER_SEQ(PPC_WINKLE)
/* No return */
4:
#endif
/*
* Check if we are coming from hypervisor userspace. If yes then we
* continue in host kernel in V mode to deliver the MC event.
*/
rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
beq 5f
andi. r11,r12,MSR_PR /* See if coming from user. */
bne 9f /* continue in V mode if we are. */
5:
#ifdef [31mCONFIG_KVM_BOOK3S_64_HANDLER[0m
/*
* We are coming from kernel context. Check if we are coming from
* guest. if yes, then we can continue. We will fall through
* do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
*/
lbz r11,HSTATE_IN_GUEST(r13)
cmpwi r11,0 /* Check if coming from guest */
bne 9f /* continue if we are. */
#endif
/*
* At this point we are not sure about what context we come from.
* Queue up the MCE event and return from the interrupt.
* But before that, check if this is an un-recoverable exception.
* If yes, then stay on emergency stack and panic.
*/
andi. r11,r12,MSR_RI
bne 2f
1: mfspr r11,SPRN_SRR0
LOAD_HANDLER(r10,unrecover_mce)
mtspr SPRN_SRR0,r10
ld r10,PACAKMSR(r13)
/*
* We are going down. But there are chances that we might get hit by
* another MCE during panic path and we may run into unstable state
* with no way out. Hence, turn ME bit off while going down, so that
* when another MCE is hit during panic path, system will checkstop
* and hypervisor will get restarted cleanly by SP.
*/
li r3,MSR_ME
andc r10,r10,r3 /* Turn off MSR_ME */
mtspr SPRN_SRR1,r10
rfid
b .
2:
/*
* Check if we have successfully handled/recovered from error, if not
* then stay on emergency stack and panic.
*/
ld r3,RESULT(r1) /* Load result */
cmpdi r3,0 /* see if we handled MCE successfully */
beq 1b /* if !handled then panic */
/*
* Return from MC interrupt.
* Queue up the MCE event so that we can log it later, while
* returning from kernel or opal call.
*/
bl machine_check_queue_event
MACHINE_CHECK_HANDLER_WINDUP
rfid
9:
/* Deliver the machine check to host kernel in V mode. */
MACHINE_CHECK_HANDLER_WINDUP
b machine_check_pSeries
EXC_COMMON_BEGIN(unrecover_mce)
/* Invoke machine_check_exception to print MCE event and panic. */
addi r3,r1,STACK_FRAME_OVERHEAD
bl machine_check_exception
/*
* We will not reach here. Even if we did, there is no way out. Call
* unrecoverable_exception and die.
*/
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl unrecoverable_exception
b 1b
EXC_REAL(data_access, 0x300, 0x380)
EXC_VIRT(data_access, 0x4300, 0x4380, 0x300)
TRAMP_KVM_SKIP(PACA_EXGEN, 0x300)
EXC_COMMON_BEGIN(data_access_common)
/*
* 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.
*/
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)
RECONCILE_IRQ_STATE(r10, r11)
ld r12,_MSR(r1)
ld r3,PACA_EXGEN+EX_DAR(r13)
lwz r4,PACA_EXGEN+EX_DSISR(r13)
li r5,0x300
std r3,_DAR(r1)
std r4,_DSISR(r1)
BEGIN_MMU_FTR_SECTION
b do_hash_page /* Try to handle as hpte fault */
MMU_FTR_SECTION_ELSE
b handle_page_fault
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
EXC_REAL_BEGIN(data_access_slb, 0x380, 0x400)
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXSLB)
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_DAR
mfspr r12,SPRN_SRR1
crset 4*cr6+eq
#ifndef [31mCONFIG_RELOCATABLE[0m
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
LOAD_HANDLER(r10, slb_miss_realmode)
mtctr r10
bctr
#endif
EXC_REAL_END(data_access_slb, 0x380, 0x400)
EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x4400)
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
crset 4*cr6+eq
#ifndef [31mCONFIG_RELOCATABLE[0m
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
LOAD_HANDLER(r10, slb_miss_realmode)
mtctr r10
bctr
#endif
EXC_VIRT_END(data_access_slb, 0x4380, 0x4400)
TRAMP_KVM_SKIP(PACA_EXSLB, 0x380)
EXC_REAL(instruction_access, 0x400, 0x480)
EXC_VIRT(instruction_access, 0x4400, 0x4480, 0x400)
TRAMP_KVM(PACA_EXGEN, 0x400)
EXC_COMMON_BEGIN(instruction_access_common)
EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
RECONCILE_IRQ_STATE(r10, r11)
ld r12,_MSR(r1)
ld r3,_NIP(r1)
andis. r4,r12,0x5820
li r5,0x400
std r3,_DAR(r1)
std r4,_DSISR(r1)
BEGIN_MMU_FTR_SECTION
b do_hash_page /* Try to handle as hpte fault */
MMU_FTR_SECTION_ELSE
b handle_page_fault
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x500)
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 */
mfspr r12,SPRN_SRR1
crclr 4*cr6+eq
#ifndef [31mCONFIG_RELOCATABLE[0m
b slb_miss_realmode
#else
mfctr r11
LOAD_HANDLER(r10, slb_miss_realmode)
mtctr r10
bctr
#endif
EXC_REAL_END(instruction_access_slb, 0x480, 0x500)
EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x4500)
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
crclr 4*cr6+eq
#ifndef [31mCONFIG_RELOCATABLE[0m
b slb_miss_realmode
#else
mfctr r11
LOAD_HANDLER(r10, slb_miss_realmode)
mtctr r10
bctr
#endif
EXC_VIRT_END(instruction_access_slb, 0x4480, 0x4500)
TRAMP_KVM(PACA_EXSLB, 0x480)
/* This handler is used by both 0x380 and 0x480 slb miss interrupts */
EXC_COMMON_BEGIN(slb_miss_realmode)
/*
* 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
* cr6.eq is set for a D-SLB miss, clear for a I-SLB miss
* We assume we aren't going to take any exceptions during this
* procedure.
*/
mflr r10
#ifdef [31mCONFIG_RELOCATABLE[0m
mtctr r11
#endif
stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
std r3,PACA_EXSLB+EX_DAR(r13)
crset 4*cr0+eq
#ifdef [31mCONFIG_PPC_STD_MMU_64[0m
BEGIN_MMU_FTR_SECTION
bl slb_allocate_realmode
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
#endif
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
beq 8f /* if bad address, make full stack frame */
andi. r10,r12,MSR_RI /* check for unrecoverable exception */
beq- 2f
/* All done -- return from exception. */
.machine push
.machine "power4"
mtcrf 0x80,r9
mtcrf 0x02,r9 /* I/D indication is in cr6 */
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
LOAD_HANDLER(r10,unrecov_slb)
mtspr SPRN_SRR0,r10
ld r10,PACAKMSR(r13)
mtspr SPRN_SRR1,r10
rfid
b .
8: mfspr r11,SPRN_SRR0
LOAD_HANDLER(r10,bad_addr_slb)
mtspr SPRN_SRR0,r10
ld r10,PACAKMSR(r13)
mtspr SPRN_SRR1,r10
rfid
b .
EXC_COMMON_BEGIN(unrecov_slb)
EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
RECONCILE_IRQ_STATE(r10, r11)
bl save_nvgprs
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl unrecoverable_exception
b 1b
EXC_COMMON_BEGIN(bad_addr_slb)
EXCEPTION_PROLOG_COMMON(0x380, PACA_EXSLB)
RECONCILE_IRQ_STATE(r10, r11)
ld r3, PACA_EXSLB+EX_DAR(r13)
std r3, _DAR(r1)
beq cr6, 2f
li r10, 0x480 /* fix trap number for I-SLB miss */
std r10, _TRAP(r1)
2: bl save_nvgprs
addi r3, r1, STACK_FRAME_OVERHEAD
bl slb_miss_bad_addr
b ret_from_except
EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x600)
.globl hardware_interrupt_hv;
hardware_interrupt_hv:
BEGIN_FTR_SECTION
_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common,
EXC_HV, SOFTEN_TEST_HV)
do_kvm_H0x500:
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
FTR_SECTION_ELSE
_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common,
EXC_STD, SOFTEN_TEST_PR)
do_kvm_0x500:
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
EXC_REAL_END(hardware_interrupt, 0x500, 0x600)
EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x4600)
.globl hardware_interrupt_relon_hv;
hardware_interrupt_relon_hv:
BEGIN_FTR_SECTION
_MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_HV, SOFTEN_TEST_HV)
FTR_SECTION_ELSE
_MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_STD, SOFTEN_TEST_PR)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
EXC_VIRT_END(hardware_interrupt, 0x4500, 0x4600)
EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ)
EXC_REAL(alignment, 0x600, 0x700)
EXC_VIRT(alignment, 0x4600, 0x4700, 0x600)
TRAMP_KVM(PACA_EXGEN, 0x600)
EXC_COMMON_BEGIN(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
RECONCILE_IRQ_STATE(r10, r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl alignment_exception
b ret_from_except
EXC_REAL(program_check, 0x700, 0x800)
EXC_VIRT(program_check, 0x4700, 0x4800, 0x700)
TRAMP_KVM(PACA_EXGEN, 0x700)
EXC_COMMON_BEGIN(program_check_common)
EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
bl save_nvgprs
RECONCILE_IRQ_STATE(r10, r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl program_check_exception
b ret_from_except
EXC_REAL(fp_unavailable, 0x800, 0x900)
EXC_VIRT(fp_unavailable, 0x4800, 0x4900, 0x800)
TRAMP_KVM(PACA_EXGEN, 0x800)
EXC_COMMON_BEGIN(fp_unavailable_common)
EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
bne 1f /* if from user, just load it up */
bl save_nvgprs
RECONCILE_IRQ_STATE(r10, r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl kernel_fp_unavailable_exception
BUG_OPCODE
1:
#ifdef [31mCONFIG_PPC_TRANSACTIONAL_MEM[0m
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 [31mCONFIG_PPC_TRANSACTIONAL_MEM[0m
2: /* User process was in a transaction */
bl save_nvgprs
RECONCILE_IRQ_STATE(r10, r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl fp_unavailable_tm
b ret_from_except
#endif
EXC_REAL_MASKABLE(decrementer, 0x900, 0x980)
EXC_VIRT_MASKABLE(decrementer, 0x4900, 0x4980, 0x900)
TRAMP_KVM(PACA_EXGEN, 0x900)
EXC_COMMON_ASYNC(decrementer_common, 0x900, timer_interrupt)
EXC_REAL_HV(hdecrementer, 0x980, 0xa00)
EXC_VIRT_HV(hdecrementer, 0x4980, 0x4a00, 0x980)
TRAMP_KVM_HV(PACA_EXGEN, 0x980)
EXC_COMMON(hdecrementer_common, 0x980, hdec_interrupt)
EXC_REAL_MASKABLE(doorbell_super, 0xa00, 0xb00)
EXC_VIRT_MASKABLE(doorbell_super, 0x4a00, 0x4b00, 0xa00)
TRAMP_KVM(PACA_EXGEN, 0xa00)
#ifdef [31mCONFIG_PPC_DOORBELL[0m
EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, doorbell_exception)
#else
EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, unknown_exception)
#endif
EXC_REAL(trap_0b, 0xb00, 0xc00)
EXC_VIRT(trap_0b, 0x4b00, 0x4c00, 0xb00)
TRAMP_KVM(PACA_EXGEN, 0xb00)
EXC_COMMON(trap_0b_common, 0xb00, unknown_exception)
#define LOAD_SYSCALL_HANDLER(reg) \
__LOAD_HANDLER(reg, system_call_common)
/* 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([31mCONFIG_RELOCATABLE[0m)
/*
* 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
* that support it) before changing to HMT_MEDIUM. That allows the KVM
* code to save that value into the guest state (it is the guest's PPR
* value). Otherwise just change to HMT_MEDIUM as userspace has
* already saved the PPR.
*/
#ifdef [31mCONFIG_KVM_BOOK3S_64_HANDLER[0m
SET_SCRATCH0(r13)
GET_PACA(r13)
std r9,PACA_EXGEN+EX_R9(r13)
OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);
HMT_MEDIUM;
std r10,PACA_EXGEN+EX_R10(r13)
OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR);
mfcr r9
KVMTEST_PR(0xc00)
GET_SCRATCH0(r13)
#else
HMT_MEDIUM;
#endif
SYSCALL_PSERIES_1
SYSCALL_PSERIES_2_RFID
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)
EXC_VIRT(single_step, 0x4d00, 0x4e00, 0xd00)
TRAMP_KVM(PACA_EXGEN, 0xd00)
EXC_COMMON(single_step_common, 0xd00, single_step_exception)
EXC_REAL_OOL_HV(h_data_storage, 0xe00, 0xe20)
EXC_VIRT_NONE(0x4e00, 0x4e20)
TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00)
EXC_COMMON_BEGIN(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
RECONCILE_IRQ_STATE(r10, r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl unknown_exception
b ret_from_except
EXC_REAL_OOL_HV(h_instr_storage, 0xe20, 0xe40)
EXC_VIRT_NONE(0x4e20, 0x4e40)
TRAMP_KVM_HV(PACA_EXGEN, 0xe20)
EXC_COMMON(h_instr_storage_common, 0xe20, unknown_exception)
EXC_REAL_OOL_HV(emulation_assist, 0xe40, 0xe60)
EXC_VIRT_OOL_HV(emulation_assist, 0x4e40, 0x4e60, 0xe40)
TRAMP_KVM_HV(PACA_EXGEN, 0xe40)
EXC_COMMON(emulation_assist_common, 0xe40, emulation_assist_interrupt)
/*
* hmi_exception trampoline is a special case. It jumps to hmi_exception_early
* first, and then eventaully from there to the trampoline to get into virtual
* mode.
*/
__EXC_REAL_OOL_HV_DIRECT(hmi_exception, 0xe60, 0xe80, hmi_exception_early)
__TRAMP_REAL_REAL_OOL_MASKABLE_HV(hmi_exception, 0xe60)
EXC_VIRT_NONE(0x4e60, 0x4e80)
TRAMP_KVM_HV(PACA_EXGEN, 0xe60)
TRAMP_REAL_BEGIN(hmi_exception_early)
EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, 0xe60)
mr r10,r1 /* Save r1 */
ld r1,PACAEMERGSP(r13) /* Use emergency stack */
subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
std r9,_CCR(r1) /* save CR in stackframe */
mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
std r11,_NIP(r1) /* save HSRR0 in stackframe */
mfspr r12,SPRN_HSRR1 /* Save SRR1 */
std r12,_MSR(r1) /* save SRR1 in stackframe */
std r10,0(r1) /* make stack chain pointer */
std r0,GPR0(r1) /* save r0 in stackframe */
std r10,GPR1(r1) /* save r1 in stackframe */
EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
EXCEPTION_PROLOG_COMMON_3(0xe60)
addi r3,r1,STACK_FRAME_OVERHEAD
bl hmi_exception_realmode
/* Windup the stack. */
/* Move original HSRR0 and HSRR1 into the respective regs */
ld r9,_MSR(r1)
mtspr SPRN_HSRR1,r9
ld r3,_NIP(r1)
mtspr SPRN_HSRR0,r3
ld r9,_CTR(r1)
mtctr r9
ld r9,_XER(r1)
mtxer r9
ld r9,_LINK(r1)
mtlr r9
REST_GPR(0, r1)
REST_8GPRS(2, r1)
REST_GPR(10, r1)
ld r11,_CCR(r1)
mtcr r11
REST_GPR(11, r1)
REST_2GPRS(12, r1)
/* restore original r1. */
ld r1,GPR1(r1)
/*
* Go to virtual mode and pull the HMI event information from
* firmware.
*/
.globl hmi_exception_after_realmode
hmi_exception_after_realmode:
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXGEN)
b tramp_real_hmi_exception
EXC_COMMON_ASYNC(hmi_exception_common, 0xe60, handle_hmi_exception)
EXC_REAL_OOL_MASKABLE_HV(h_doorbell, 0xe80, 0xea0)
EXC_VIRT_OOL_MASKABLE_HV(h_doorbell, 0x4e80, 0x4ea0, 0xe80)
TRAMP_KVM_HV(PACA_EXGEN, 0xe80)
#ifdef [31mCONFIG_PPC_DOORBELL[0m
EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, doorbell_exception)
#else
EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, unknown_exception)
#endif
EXC_REAL_OOL_MASKABLE_HV(h_virt_irq, 0xea0, 0xec0)
EXC_VIRT_OOL_MASKABLE_HV(h_virt_irq, 0x4ea0, 0x4ec0, 0xea0)
TRAMP_KVM_HV(PACA_EXGEN, 0xea0)
EXC_COMMON_ASYNC(h_virt_irq_common, 0xea0, do_IRQ)
EXC_REAL_NONE(0xec0, 0xf00)
EXC_VIRT_NONE(0x4ec0, 0x4f00)
EXC_REAL_OOL(performance_monitor, 0xf00, 0xf20)
EXC_VIRT_OOL(performance_monitor, 0x4f00, 0x4f20, 0xf00)
TRAMP_KVM(PACA_EXGEN, 0xf00)
EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception)
EXC_REAL_OOL(altivec_unavailable, 0xf20, 0xf40)
EXC_VIRT_OOL(altivec_unavailable, 0x4f20, 0x4f40, 0xf20)
TRAMP_KVM(PACA_EXGEN, 0xf20)
EXC_COMMON_BEGIN(altivec_unavailable_common)
EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
#ifdef [31mCONFIG_ALTIVEC[0m
BEGIN_FTR_SECTION
beq 1f
#ifdef [31mCONFIG_PPC_TRANSACTIONAL_MEM[0m
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 [31mCONFIG_PPC_TRANSACTIONAL_MEM[0m
2: /* User process was in a transaction */
bl save_nvgprs
RECONCILE_IRQ_STATE(r10, r11)
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
RECONCILE_IRQ_STATE(r10, r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl altivec_unavailable_exception
b ret_from_except
EXC_REAL_OOL(vsx_unavailable, 0xf40, 0xf60)
EXC_VIRT_OOL(vsx_unavailable, 0x4f40, 0x4f60, 0xf40)
TRAMP_KVM(PACA_EXGEN, 0xf40)
EXC_COMMON_BEGIN(vsx_unavailable_common)
EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
#ifdef [31mCONFIG_VSX[0m
BEGIN_FTR_SECTION
beq 1f
#ifdef [31mCONFIG_PPC_TRANSACTIONAL_MEM[0m
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 [31mCONFIG_PPC_TRANSACTIONAL_MEM[0m
2: /* User process was in a transaction */
bl save_nvgprs
RECONCILE_IRQ_STATE(r10, r11)
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
RECONCILE_IRQ_STATE(r10, r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl vsx_unavailable_exception
b ret_from_except
EXC_REAL_OOL(facility_unavailable, 0xf60, 0xf80)
EXC_VIRT_OOL(facility_unavailable, 0x4f60, 0x4f80, 0xf60)
TRAMP_KVM(PACA_EXGEN, 0xf60)
EXC_COMMON(facility_unavailable_common, 0xf60, facility_unavailable_exception)
EXC_REAL_OOL_HV(h_facility_unavailable, 0xf80, 0xfa0)
EXC_VIRT_OOL_HV(h_facility_unavailable, 0x4f80, 0x4fa0, 0xf80)
TRAMP_KVM_HV(PACA_EXGEN, 0xf80)
EXC_COMMON(h_facility_unavailable_common, 0xf80, facility_unavailable_exception)
EXC_REAL_NONE(0xfa0, 0x1200)
EXC_VIRT_NONE(0x4fa0, 0x5200)
#ifdef [31mCONFIG_CBE_RAS[0m
EXC_REAL_HV(cbe_system_error, 0x1200, 0x1300)
EXC_VIRT_NONE(0x5200, 0x5300)
TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1200)
EXC_COMMON(cbe_system_error_common, 0x1200, cbe_system_error_exception)
#else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1200, 0x1300)
EXC_VIRT_NONE(0x5200, 0x5300)
#endif
EXC_REAL(instruction_breakpoint, 0x1300, 0x1400)
EXC_VIRT(instruction_breakpoint, 0x5300, 0x5400, 0x1300)
TRAMP_KVM_SKIP(PACA_EXGEN, 0x1300)
EXC_COMMON(instruction_breakpoint_common, 0x1300, instruction_breakpoint_exception)
EXC_REAL_NONE(0x1400, 0x1500)
EXC_VIRT_NONE(0x5400, 0x5500)
EXC_REAL_BEGIN(denorm_exception_hv, 0x1500, 0x1600)
mtspr SPRN_SPRG_HSCRATCH0,r13
EXCEPTION_PROLOG_0(PACA_EXGEN)
EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
#ifdef [31mCONFIG_PPC_DENORMALISATION[0m
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
KVMTEST_PR(0x1500)
EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
EXC_REAL_END(denorm_exception_hv, 0x1500, 0x1600)
#ifdef [31mCONFIG_PPC_DENORMALISATION[0m
EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x5600)
b exc_real_0x1500_denorm_exception_hv
EXC_VIRT_END(denorm_exception, 0x5500, 0x5600)
#else
EXC_VIRT_NONE(0x5500, 0x5600)
#endif
TRAMP_KVM_SKIP(PACA_EXGEN, 0x1500)
#ifdef [31mCONFIG_PPC_DENORMALISATION[0m
TRAMP_REAL_BEGIN(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
#define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
#define FMR4(n) FMR2(n) ; FMR2(n+2)
#define FMR8(n) FMR4(n) ; FMR4(n+4)
#define FMR16(n) FMR8(n) ; FMR8(n+8)
#define FMR32(n) FMR16(n) ; FMR16(n+16)
FMR32(0)
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
#define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
#define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
#define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
#define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
#define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
XVCPSGNDP32(0)
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
BEGIN_FTR_SECTION
b denorm_done
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
/*
* To denormalise we need to move a copy of the register to itself.
* For POWER8 we need to do that for all 64 VSX registers
*/
XVCPSGNDP32(32)
denorm_done:
mtspr SPRN_HSRR0,r11
mtcrf 0x80,r9
ld r9,PACA_EXGEN+EX_R9(r13)
RESTORE_PPR_PACA(PACA_EXGEN, r10)
BEGIN_FTR_SECTION
ld r10,PACA_EXGEN+EX_CFAR(r13)
mtspr SPRN_CFAR,r10
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
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
EXC_COMMON_HV(denorm_common, 0x1500, unknown_exception)
#ifdef [31mCONFIG_CBE_RAS[0m
EXC_REAL_HV(cbe_maintenance, 0x1600, 0x1700)
EXC_VIRT_NONE(0x5600, 0x5700)
TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1600)
EXC_COMMON(cbe_maintenance_common, 0x1600, cbe_maintenance_exception)
#else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1600, 0x1700)
EXC_VIRT_NONE(0x5600, 0x5700)
#endif
EXC_REAL(altivec_assist, 0x1700, 0x1800)
EXC_VIRT(altivec_assist, 0x5700, 0x5800, 0x1700)
TRAMP_KVM(PACA_EXGEN, 0x1700)
#ifdef [31mCONFIG_ALTIVEC[0m
EXC_COMMON(altivec_assist_common, 0x1700, altivec_assist_exception)
#else
EXC_COMMON(altivec_assist_common, 0x1700, unknown_exception)
#endif
#ifdef [31mCONFIG_CBE_RAS[0m
EXC_REAL_HV(cbe_thermal, 0x1800, 0x1900)
EXC_VIRT_NONE(0x5800, 0x5900)
TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1800)
EXC_COMMON(cbe_thermal_common, 0x1800, cbe_thermal_exception)
#else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1800, 0x1900)
EXC_VIRT_NONE(0x5800, 0x5900)
#endif
/*
* 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.
* - If it was a HMI we return immediately since we handled it in realmode
* and it won't 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; \
cmpwi r10,PACA_IRQ_HMI; \
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 .
/*
* Real mode exceptions actually use this too, but alternate
* instruction code patches (which end up in the common .text area)
* cannot reach these if they are put there.
*/
USE_FIXED_SECTION(virt_trampolines)
MASKED_INTERRUPT()
MASKED_INTERRUPT(H)
#ifdef [31mCONFIG_KVM_BOOK3S_64_HANDLER[0m
TRAMP_REAL_BEGIN(kvmppc_skip_interrupt)
/*
* Here all GPRs are unchanged from when the interrupt happened
* except for r13, which is saved in SPRG_SCRATCH0.
*/
mfspr r13, SPRN_SRR0
addi r13, r13, 4
mtspr SPRN_SRR0, r13
GET_SCRATCH0(r13)
rfid
b .
TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt)
/*
* Here all GPRs are unchanged from when the interrupt happened
* except for r13, which is saved in SPRG_SCRATCH0.
*/
mfspr r13, SPRN_HSRR0
addi r13, r13, 4
mtspr SPRN_HSRR0, r13
GET_SCRATCH0(r13)
hrfid
b .
#endif
/*
* Ensure that any handlers that get invoked from the exception prologs
* above are below the first 64KB (0x10000) of the kernel image because
* the prologs assemble the addresses of these handlers using the
* LOAD_HANDLER macro, which uses an ori instruction.
*/
/*** Common interrupt handlers ***/
/*
* 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.
*/
EXC_COMMON_BEGIN(ppc64_runlatch_on_trampoline)
b __ppc64_runlatch_on
USE_FIXED_SECTION(virt_trampolines)
/*
* The __end_interrupts marker must be past the out-of-line (OOL)
* handlers, so that they are copied to real address 0x100 when running
* a relocatable kernel. This ensures they can be reached from the short
* trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch
* directly, without using LOAD_HANDLER().
*/
.align 7
.globl __end_interrupts
__end_interrupts:
DEFINE_FIXED_SYMBOL(__end_interrupts)
#ifdef [31mCONFIG_PPC_970_NAP[0m
EXC_COMMON_BEGIN(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
CLOSE_FIXED_SECTION(real_vectors);
CLOSE_FIXED_SECTION(real_trampolines);
CLOSE_FIXED_SECTION(virt_vectors);
CLOSE_FIXED_SECTION(virt_trampolines);
USE_TEXT_SECTION()
/*
* Hash table stuff
*/
.balign IFETCH_ALIGN_BYTES
do_hash_page:
#ifdef [31mCONFIG_PPC_STD_MMU_64[0m
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
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 */
/*
* r3 contains the faulting address
* r4 msr
* r5 contains the trap number
* r6 contains dsisr
*
* at return r3 = 0 for success, 1 for page fault, negative for error
*/
mr r4,r12
ld r6,_DSISR(r1)
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
#endif /* CONFIG_PPC_STD_MMU_64 */
/* 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
#ifdef [31mCONFIG_PPC_STD_MMU_64[0m
/* 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
#endif
/*
* 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 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
/*
* 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
cmpwi r3,0xea0
beq h_virt_irq_common
cmpwi r3,0xe60
beq hmi_exception_common
FTR_SECTION_ELSE
cmpwi r3,0xa00
beq doorbell_super_common
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
blr