1062 lines
27 KiB
ArmAsm
1062 lines
27 KiB
ArmAsm
/*
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* This file contains the 64-bit "server" PowerPC variant
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* of the low level exception handling including exception
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* vectors, exception return, part of the slb and stab
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* handling and other fixed offset specific things.
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*
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* This file is meant to be #included from head_64.S due to
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* position dependent assembly.
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*
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* Most of this originates from head_64.S and thus has the same
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* copyright history.
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*
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*/
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#include <asm/hw_irq.h>
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#include <asm/exception-64s.h>
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#include <asm/ptrace.h>
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/*
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* We layout physical memory as follows:
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* 0x0000 - 0x00ff : Secondary processor spin code
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* 0x0100 - 0x2fff : pSeries Interrupt prologs
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* 0x3000 - 0x5fff : interrupt support common interrupt prologs
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* 0x6000 - 0x6fff : Initial (CPU0) segment table
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* 0x7000 - 0x7fff : FWNMI data area
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* 0x8000 - : Early init and support code
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*/
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/*
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* This is the start of the interrupt handlers for pSeries
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* This code runs with relocation off.
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* Code from here to __end_interrupts gets copied down to real
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* address 0x100 when we are running a relocatable kernel.
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* Therefore any relative branches in this section must only
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* branch to labels in this section.
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*/
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. = 0x100
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.globl __start_interrupts
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__start_interrupts:
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.globl system_reset_pSeries;
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system_reset_pSeries:
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HMT_MEDIUM;
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SET_SCRATCH0(r13)
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#ifdef CONFIG_PPC_P7_NAP
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BEGIN_FTR_SECTION
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/* Running native on arch 2.06 or later, check if we are
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* waking up from nap. We only handle no state loss and
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* supervisor state loss. We do -not- handle hypervisor
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* state loss at this time.
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*/
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mfspr r13,SPRN_SRR1
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rlwinm. r13,r13,47-31,30,31
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beq 9f
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/* waking up from powersave (nap) state */
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cmpwi cr1,r13,2
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/* Total loss of HV state is fatal, we could try to use the
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* PIR to locate a PACA, then use an emergency stack etc...
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* but for now, let's just stay stuck here
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*/
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bgt cr1,.
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GET_PACA(r13)
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#ifdef CONFIG_KVM_BOOK3S_64_HV
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lbz r0,PACAPROCSTART(r13)
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cmpwi r0,0x80
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bne 1f
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li r0,1
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stb r0,PACAPROCSTART(r13)
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b kvm_start_guest
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1:
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#endif
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beq cr1,2f
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b .power7_wakeup_noloss
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2: b .power7_wakeup_loss
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9:
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END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
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#endif /* CONFIG_PPC_P7_NAP */
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EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
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NOTEST, 0x100)
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. = 0x200
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machine_check_pSeries_1:
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/* This is moved out of line as it can be patched by FW, but
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* some code path might still want to branch into the original
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* vector
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*/
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b machine_check_pSeries
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. = 0x300
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.globl data_access_pSeries
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data_access_pSeries:
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HMT_MEDIUM
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SET_SCRATCH0(r13)
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BEGIN_FTR_SECTION
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b data_access_check_stab
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data_access_not_stab:
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END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
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EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
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KVMTEST, 0x300)
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. = 0x380
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.globl data_access_slb_pSeries
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data_access_slb_pSeries:
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HMT_MEDIUM
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
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std r3,PACA_EXSLB+EX_R3(r13)
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mfspr r3,SPRN_DAR
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#ifdef __DISABLED__
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/* Keep that around for when we re-implement dynamic VSIDs */
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cmpdi r3,0
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bge slb_miss_user_pseries
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#endif /* __DISABLED__ */
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mfspr r12,SPRN_SRR1
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#ifndef CONFIG_RELOCATABLE
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b .slb_miss_realmode
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#else
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/*
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* We can't just use a direct branch to .slb_miss_realmode
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* because the distance from here to there depends on where
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* the kernel ends up being put.
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*/
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mfctr r11
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ld r10,PACAKBASE(r13)
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LOAD_HANDLER(r10, .slb_miss_realmode)
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mtctr r10
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bctr
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#endif
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STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
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. = 0x480
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.globl instruction_access_slb_pSeries
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instruction_access_slb_pSeries:
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HMT_MEDIUM
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
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std r3,PACA_EXSLB+EX_R3(r13)
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mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
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#ifdef __DISABLED__
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/* Keep that around for when we re-implement dynamic VSIDs */
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cmpdi r3,0
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bge slb_miss_user_pseries
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#endif /* __DISABLED__ */
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mfspr r12,SPRN_SRR1
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#ifndef CONFIG_RELOCATABLE
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b .slb_miss_realmode
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#else
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mfctr r11
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ld r10,PACAKBASE(r13)
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LOAD_HANDLER(r10, .slb_miss_realmode)
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mtctr r10
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bctr
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#endif
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/* We open code these as we can't have a ". = x" (even with
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* x = "." within a feature section
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*/
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. = 0x500;
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.globl hardware_interrupt_pSeries;
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.globl hardware_interrupt_hv;
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hardware_interrupt_pSeries:
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hardware_interrupt_hv:
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BEGIN_FTR_SECTION
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_MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
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EXC_HV, SOFTEN_TEST_HV)
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KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
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FTR_SECTION_ELSE
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_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
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EXC_STD, SOFTEN_TEST_HV_201)
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
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ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
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STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
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STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
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STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
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MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer)
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MASKABLE_EXCEPTION_HV(0x980, 0x982, decrementer)
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STD_EXCEPTION_PSERIES(0xa00, 0xa00, trap_0a)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
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STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
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. = 0xc00
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.globl system_call_pSeries
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system_call_pSeries:
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HMT_MEDIUM
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#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
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SET_SCRATCH0(r13)
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GET_PACA(r13)
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std r9,PACA_EXGEN+EX_R9(r13)
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std r10,PACA_EXGEN+EX_R10(r13)
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mfcr r9
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KVMTEST(0xc00)
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GET_SCRATCH0(r13)
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#endif
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BEGIN_FTR_SECTION
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cmpdi r0,0x1ebe
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beq- 1f
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END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
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mr r9,r13
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GET_PACA(r13)
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mfspr r11,SPRN_SRR0
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mfspr r12,SPRN_SRR1
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ld r10,PACAKBASE(r13)
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LOAD_HANDLER(r10, system_call_entry)
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mtspr SPRN_SRR0,r10
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ld r10,PACAKMSR(r13)
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mtspr SPRN_SRR1,r10
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rfid
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b . /* prevent speculative execution */
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
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/* Fast LE/BE switch system call */
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1: mfspr r12,SPRN_SRR1
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xori r12,r12,MSR_LE
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mtspr SPRN_SRR1,r12
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rfid /* return to userspace */
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b .
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STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
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/* At 0xe??? we have a bunch of hypervisor exceptions, we branch
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* out of line to handle them
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*/
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. = 0xe00
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b h_data_storage_hv
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. = 0xe20
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b h_instr_storage_hv
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. = 0xe40
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b emulation_assist_hv
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. = 0xe50
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b hmi_exception_hv
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. = 0xe60
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b hmi_exception_hv
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/* We need to deal with the Altivec unavailable exception
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* here which is at 0xf20, thus in the middle of the
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* prolog code of the PerformanceMonitor one. A little
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* trickery is thus necessary
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*/
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performance_monitor_pSeries_1:
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. = 0xf00
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b performance_monitor_pSeries
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altivec_unavailable_pSeries_1:
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. = 0xf20
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b altivec_unavailable_pSeries
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vsx_unavailable_pSeries_1:
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. = 0xf40
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b vsx_unavailable_pSeries
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#ifdef CONFIG_CBE_RAS
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STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
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KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
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#endif /* CONFIG_CBE_RAS */
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STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
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KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
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#ifdef CONFIG_CBE_RAS
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STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
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KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
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#endif /* CONFIG_CBE_RAS */
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STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
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#ifdef CONFIG_CBE_RAS
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STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
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KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
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#endif /* CONFIG_CBE_RAS */
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. = 0x3000
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/*** Out of line interrupts support ***/
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/* moved from 0x200 */
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machine_check_pSeries:
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.globl machine_check_fwnmi
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machine_check_fwnmi:
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HMT_MEDIUM
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SET_SCRATCH0(r13) /* save r13 */
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EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common,
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EXC_STD, KVMTEST, 0x200)
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KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
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/* moved from 0x300 */
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data_access_check_stab:
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GET_PACA(r13)
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std r9,PACA_EXSLB+EX_R9(r13)
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std r10,PACA_EXSLB+EX_R10(r13)
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mfspr r10,SPRN_DAR
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mfspr r9,SPRN_DSISR
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srdi r10,r10,60
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rlwimi r10,r9,16,0x20
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#ifdef CONFIG_KVM_BOOK3S_PR
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lbz r9,HSTATE_IN_GUEST(r13)
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rlwimi r10,r9,8,0x300
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#endif
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mfcr r9
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cmpwi r10,0x2c
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beq do_stab_bolted_pSeries
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mtcrf 0x80,r9
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ld r9,PACA_EXSLB+EX_R9(r13)
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ld r10,PACA_EXSLB+EX_R10(r13)
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b data_access_not_stab
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do_stab_bolted_pSeries:
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std r11,PACA_EXSLB+EX_R11(r13)
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std r12,PACA_EXSLB+EX_R12(r13)
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GET_SCRATCH0(r10)
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std r10,PACA_EXSLB+EX_R13(r13)
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EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
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KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
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KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
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KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
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KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
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.align 7
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/* moved from 0xe00 */
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STD_EXCEPTION_HV(., 0xe02, h_data_storage)
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KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
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STD_EXCEPTION_HV(., 0xe22, h_instr_storage)
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KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
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STD_EXCEPTION_HV(., 0xe42, emulation_assist)
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KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
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STD_EXCEPTION_HV(., 0xe62, hmi_exception) /* need to flush cache ? */
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KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
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/* moved from 0xf00 */
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STD_EXCEPTION_PSERIES(., 0xf00, performance_monitor)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
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STD_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
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STD_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable)
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KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
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/*
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* An interrupt came in while soft-disabled. We set paca->irq_happened,
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* then, if it was a decrementer interrupt, we bump the dec to max and
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* and return, else we hard disable and return. This is called with
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* r10 containing the value to OR to the paca field.
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*/
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#define MASKED_INTERRUPT(_H) \
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masked_##_H##interrupt: \
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std r11,PACA_EXGEN+EX_R11(r13); \
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lbz r11,PACAIRQHAPPENED(r13); \
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or r11,r11,r10; \
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stb r11,PACAIRQHAPPENED(r13); \
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andi. r10,r10,PACA_IRQ_DEC; \
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beq 1f; \
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lis r10,0x7fff; \
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ori r10,r10,0xffff; \
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mtspr SPRN_DEC,r10; \
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b 2f; \
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1: mfspr r10,SPRN_##_H##SRR1; \
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rldicl r10,r10,48,1; /* clear MSR_EE */ \
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rotldi r10,r10,16; \
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mtspr SPRN_##_H##SRR1,r10; \
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2: mtcrf 0x80,r9; \
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ld r9,PACA_EXGEN+EX_R9(r13); \
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ld r10,PACA_EXGEN+EX_R10(r13); \
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ld r11,PACA_EXGEN+EX_R11(r13); \
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GET_SCRATCH0(r13); \
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##_H##rfid; \
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b .
|
|
|
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MASKED_INTERRUPT()
|
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MASKED_INTERRUPT(H)
|
|
|
|
/*
|
|
* Called from arch_local_irq_enable when an interrupt needs
|
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* to be resent. r3 contains 0x500 or 0x900 to indicate which
|
|
* kind of interrupt. MSR:EE is already off. We generate a
|
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* 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
|
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mflr r11
|
|
mfcr r9
|
|
ori r12,r12,MSR_EE
|
|
andi. r3,r3,0x0800
|
|
bne decrementer_common
|
|
b hardware_interrupt_common
|
|
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
/*
|
|
* Vectors for the FWNMI option. Share common code.
|
|
*/
|
|
.globl system_reset_fwnmi
|
|
.align 7
|
|
system_reset_fwnmi:
|
|
HMT_MEDIUM
|
|
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__ */
|
|
|
|
.align 7
|
|
.globl __end_interrupts
|
|
__end_interrupts:
|
|
|
|
/*
|
|
* 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 addi instruction, these handlers must be in
|
|
* the first 32k 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(0xa00, trap_0a, .unknown_exception)
|
|
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)
|
|
STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception)
|
|
STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_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 */
|
|
|
|
.align 7
|
|
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
|
|
|
|
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: bl .load_up_fpu
|
|
b fast_exception_return
|
|
|
|
.align 7
|
|
.globl altivec_unavailable_common
|
|
altivec_unavailable_common:
|
|
EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
|
|
#ifdef CONFIG_ALTIVEC
|
|
BEGIN_FTR_SECTION
|
|
beq 1f
|
|
bl .load_up_altivec
|
|
b fast_exception_return
|
|
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
|
|
b .load_up_vsx
|
|
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 __end_handlers
|
|
__end_handlers:
|
|
|
|
/*
|
|
* 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)
|
|
|
|
clrrdi r11,r1,THREAD_SHIFT
|
|
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_dabr
|
|
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 */
|
|
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 */
|
|
|
|
#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
|
|
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 */
|