/* * 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 #include #include #include /* * 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 . ; /* prevent speculative execution */ #if defined(CONFIG_RELOCATABLE) /* * We can't branch directly so we do it via the CTR which * is volatile across system calls. */ #define SYSCALL_PSERIES_2_DIRECT \ mflr r10 ; \ ld r12,PACAKBASE(r13) ; \ LOAD_HANDLER(r12, system_call_entry) ; \ 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_common ; #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: 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/sleep/winkle. */ mfspr r13,SPRN_SRR1 rlwinm. r13,r13,47-31,30,31 beq 9f cmpwi cr3,r13,2 /* * Check if last bit of HSPGR0 is set. This indicates whether we are * waking up from winkle. */ GET_PACA(r13) clrldi r5,r13,63 clrrdi r13,r13,1 cmpwi cr4,r5,1 mtspr SPRN_HSPRG0,r13 lbz r0,PACA_THREAD_IDLE_STATE(r13) cmpwi cr2,r0,PNV_THREAD_NAP bgt cr2,8f /* Either sleep or Winkle */ /* Waking up from nap should not cause hypervisor state loss */ bgt cr3,. /* Waking up from nap */ li r0,PNV_THREAD_RUNNING stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */ #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 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 beq cr3,2f b power7_wakeup_noloss 2: b power7_wakeup_loss /* Fast Sleep wakeup on PowerNV */ 8: GET_PACA(r13) b power7_wakeup_tb_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 */ SET_SCRATCH0(r13) /* save 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 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR) beq 9f mfspr r13,SPRN_SRR1 rlwinm. r13,r13,47-31,30,31 /* waking up from powersave (nap) state */ cmpwi cr1,r13,2 /* Total loss of HV state is fatal. let's just stay stuck here */ OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR) bgt cr1,. 9: OPT_SET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR) END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) #endif /* CONFIG_PPC_P7_NAP */ EXCEPTION_PROLOG_0(PACA_EXMC) BEGIN_FTR_SECTION b machine_check_pSeries_early FTR_SECTION_ELSE b machine_check_pSeries_0 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) . = 0x300 .globl data_access_pSeries data_access_pSeries: SET_SCRATCH0(r13) EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD, KVMTEST, 0x300) . = 0x380 .globl data_access_slb_pSeries data_access_slb_pSeries: 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: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 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_PR) 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(PACA_EXGEN, EXC_STD, 0x600) STD_EXCEPTION_PSERIES(0x700, 0x700, program_check) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x700) STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x800) . = 0x900 .globl decrementer_pSeries decrementer_pSeries: _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR) STD_EXCEPTION_HV(0x980, 0x982, hdecrementer) MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xa00) STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xb00) . = 0xc00 .globl system_call_pSeries system_call_pSeries: /* * 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 CONFIG_KVM_BOOK3S_64_HANDLER 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(0xc00) GET_SCRATCH0(r13) #else HMT_MEDIUM; #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(PACA_EXGEN, EXC_STD, 0xd00) /* At 0xe??? we have a bunch of hypervisor exceptions, we branch * out of line to handle them */ . = 0xe00 hv_data_storage_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_data_storage_hv . = 0xe20 hv_instr_storage_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_instr_storage_hv . = 0xe40 emulation_assist_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b emulation_assist_hv . = 0xe60 hv_exception_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b hmi_exception_early . = 0xe80 hv_doorbell_trampoline: 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 */ . = 0xf00 performance_monitor_pseries_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b performance_monitor_pSeries . = 0xf20 altivec_unavailable_pseries_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b altivec_unavailable_pSeries . = 0xf40 vsx_unavailable_pseries_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b vsx_unavailable_pSeries . = 0xf60 facility_unavailable_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b facility_unavailable_pSeries . = 0xf80 hv_facility_unavailable_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b facility_unavailable_hv #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_SKIP(PACA_EXGEN, EXC_STD, 0x1300) . = 0x1500 .global denorm_exception_hv denorm_exception_hv: mtspr SPRN_SPRG_HSCRATCH0,r13 EXCEPTION_PROLOG_0(PACA_EXGEN) EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500) #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 KVMTEST(0x1500) 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(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_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 */ ld r12,PACAKBASE(r13) /* get high part of &label */ 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) ld r12,PACAKBASE(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) 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, 0x200) EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD) KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300) KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x400) KVM_HANDLER(PACA_EXSLB, EXC_STD, 0x480) KVM_HANDLER(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 #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 .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) MASKABLE_EXCEPTION_HV_OOL(0xe62, hmi_exception) 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(PACA_EXGEN, EXC_STD, 0xf00) STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf20) STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf40) STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf60) STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82) /* * 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 . 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: 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__ */ #ifdef CONFIG_KVM_BOOK3S_64_HANDLER 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 . 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 /* * 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) 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, emulation_assist_interrupt) STD_EXCEPTION_COMMON_ASYNC(0xe60, hmi_exception, handle_hmi_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_HVMODE) 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 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ . = 0x4e20 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ . = 0x4e40 emulation_assist_relon_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b emulation_assist_relon_hv . = 0x4e60 b . /* Can't happen, see v2.07 Book III-S section 6.5 */ . = 0x4e80 h_doorbell_relon_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_doorbell_relon_hv . = 0x4f00 performance_monitor_relon_pseries_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b performance_monitor_relon_pSeries . = 0x4f20 altivec_unavailable_relon_pseries_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b altivec_unavailable_relon_pSeries . = 0x4f40 vsx_unavailable_relon_pseries_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b vsx_unavailable_relon_pSeries . = 0x4f60 facility_unavailable_relon_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b facility_unavailable_relon_pSeries . = 0x4f80 hv_facility_unavailable_relon_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b hv_facility_unavailable_relon_hv STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint) #ifdef CONFIG_PPC_DENORMALISATION . = 0x5500 b denorm_exception_hv #endif STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist) /* Other future vectors */ .align 7 .globl __end_interrupts __end_interrupts: .align 7 system_call_entry: b system_call_common ppc64_runlatch_on_trampoline: b __ppc64_runlatch_on /* * 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) 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 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 RECONCILE_IRQ_STATE(r10, r11) 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) RECONCILE_IRQ_STATE(r10, r11) 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) RECONCILE_IRQ_STATE(r10, r11) bl save_nvgprs 1: addi r3,r1,STACK_FRAME_OVERHEAD bl unrecoverable_exception b 1b #endif /* __DISABLED__ */ /* * 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: 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(0x200, PACA_EXMC) FINISH_NAP RECONCILE_IRQ_STATE(r10, r11) 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 addi r3,r1,STACK_FRAME_OVERHEAD bl machine_check_exception b ret_from_except .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 RECONCILE_IRQ_STATE(r10, r11) 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 RECONCILE_IRQ_STATE(r10, r11) 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 RECONCILE_IRQ_STATE(r10, r11) 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 RECONCILE_IRQ_STATE(r10, r11) 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 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 .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 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 STD_EXCEPTION_COMMON(0xf60, facility_unavailable, facility_unavailable_exception) STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, facility_unavailable_exception) .align 7 .globl __end_handlers __end_handlers: /* Equivalents to the above handlers for relocation-on interrupt vectors */ STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist) MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell) 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, facility_unavailable) STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_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) */ .globl hmi_exception_early hmi_exception_early: EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 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 hmi_exception_hv #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. */ .align 7 .globl machine_check_handle_early 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 CONFIG_PPC_P7_NAP /* * 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 or * supervisor state loss * * Go back to nap 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 bne 3f /* Supervisor 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) li r3,PNV_THREAD_NAP b power7_enter_nap_mode 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 CONFIG_KVM_BOOK3S_64_HANDLER /* * 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 ld r10,PACAKBASE(r13) 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 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 /* * 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. */ 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) RECONCILE_IRQ_STATE(r10, r11) 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 /* * Hash table stuff */ .align 7 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 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 /* 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 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