/* * 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 /* * We layout physical memory as follows: * 0x0000 - 0x00ff : Secondary processor spin code * 0x0100 - 0x17ff : pSeries Interrupt prologs * 0x1800 - 0x4000 : interrupt support common interrupt prologs * 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1 * 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1 * 0x7000 - 0x7fff : FWNMI data area * 0x8000 - 0x8fff : Initial (CPU0) segment table * 0x9000 - : Early init and support code */ /* Syscall routine is used twice, in reloc-off and reloc-on paths */ #define SYSCALL_PSERIES_1 \ BEGIN_FTR_SECTION \ cmpdi r0,0x1ebe ; \ beq- 1f ; \ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \ mr r9,r13 ; \ GET_PACA(r13) ; \ mfspr r11,SPRN_SRR0 ; \ 0: #define SYSCALL_PSERIES_2_RFID \ mfspr r12,SPRN_SRR1 ; \ ld r10,PACAKBASE(r13) ; \ LOAD_HANDLER(r10, system_call_entry) ; \ mtspr SPRN_SRR0,r10 ; \ ld r10,PACAKMSR(r13) ; \ mtspr SPRN_SRR1,r10 ; \ rfid ; \ b . ; /* prevent speculative execution */ #define SYSCALL_PSERIES_3 \ /* Fast LE/BE switch system call */ \ 1: mfspr r12,SPRN_SRR1 ; \ xori r12,r12,MSR_LE ; \ mtspr SPRN_SRR1,r12 ; \ rfid ; /* return to userspace */ \ b . ; \ 2: mfspr r12,SPRN_SRR1 ; \ andi. r12,r12,MSR_PR ; \ bne 0b ; \ mtspr SPRN_SRR0,r3 ; \ mtspr SPRN_SRR1,r4 ; \ mtspr SPRN_SDR1,r5 ; \ rfid ; \ b . ; /* prevent speculative execution */ #if defined(CONFIG_RELOCATABLE) /* * We can't branch directly; in the direct case we use LR * and system_call_entry restores LR. (We thus need to move * LR to r10 in the RFID case too.) */ #define SYSCALL_PSERIES_2_DIRECT \ mflr r10 ; \ ld r12,PACAKBASE(r13) ; \ LOAD_HANDLER(r12, system_call_entry_direct) ; \ mtctr r12 ; \ mfspr r12,SPRN_SRR1 ; \ /* Re-use of r13... No spare regs to do this */ \ li r13,MSR_RI ; \ mtmsrd r13,1 ; \ GET_PACA(r13) ; /* get r13 back */ \ bctr ; #else /* We can branch directly */ #define SYSCALL_PSERIES_2_DIRECT \ mfspr r12,SPRN_SRR1 ; \ li r10,MSR_RI ; \ mtmsrd r10,1 ; /* Set RI (EE=0) */ \ b system_call_entry_direct ; #endif /* * This is the start of the interrupt handlers for pSeries * This code runs with relocation off. * Code from here to __end_interrupts gets copied down to real * address 0x100 when we are running a relocatable kernel. * Therefore any relative branches in this section must only * branch to labels in this section. */ . = 0x100 .globl __start_interrupts __start_interrupts: .globl system_reset_pSeries; system_reset_pSeries: HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) #ifdef CONFIG_PPC_P7_NAP BEGIN_FTR_SECTION /* Running native on arch 2.06 or later, check if we are * waking up from nap. We only handle no state loss and * supervisor state loss. We do -not- handle hypervisor * state loss at this time. */ mfspr r13,SPRN_SRR1 rlwinm. r13,r13,47-31,30,31 beq 9f /* waking up from powersave (nap) state */ cmpwi cr1,r13,2 /* Total loss of HV state is fatal, we could try to use the * PIR to locate a PACA, then use an emergency stack etc... * but for now, let's just stay stuck here */ bgt cr1,. GET_PACA(r13) #ifdef CONFIG_KVM_BOOK3S_64_HV li r0,KVM_HWTHREAD_IN_KERNEL stb r0,HSTATE_HWTHREAD_STATE(r13) /* Order setting hwthread_state vs. testing hwthread_req */ sync lbz r0,HSTATE_HWTHREAD_REQ(r13) cmpwi r0,0 beq 1f b kvm_start_guest 1: #endif beq cr1,2f b .power7_wakeup_noloss 2: b .power7_wakeup_loss 9: END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) #endif /* CONFIG_PPC_P7_NAP */ EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD, NOTEST, 0x100) . = 0x200 machine_check_pSeries_1: /* This is moved out of line as it can be patched by FW, but * some code path might still want to branch into the original * vector */ HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) /* save r13 */ EXCEPTION_PROLOG_0(PACA_EXMC) b machine_check_pSeries_0 . = 0x300 .globl data_access_pSeries data_access_pSeries: HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) BEGIN_FTR_SECTION b data_access_check_stab data_access_not_stab: END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB) EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD, KVMTEST, 0x300) . = 0x380 .globl data_access_slb_pSeries data_access_slb_pSeries: HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380) std r3,PACA_EXSLB+EX_R3(r13) mfspr r3,SPRN_DAR #ifdef __DISABLED__ /* Keep that around for when we re-implement dynamic VSIDs */ cmpdi r3,0 bge slb_miss_user_pseries #endif /* __DISABLED__ */ mfspr r12,SPRN_SRR1 #ifndef CONFIG_RELOCATABLE b .slb_miss_realmode #else /* * We can't just use a direct branch to .slb_miss_realmode * because the distance from here to there depends on where * the kernel ends up being put. */ mfctr r11 ld r10,PACAKBASE(r13) LOAD_HANDLER(r10, .slb_miss_realmode) mtctr r10 bctr #endif STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access) . = 0x480 .globl instruction_access_slb_pSeries instruction_access_slb_pSeries: HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480) std r3,PACA_EXSLB+EX_R3(r13) mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ #ifdef __DISABLED__ /* Keep that around for when we re-implement dynamic VSIDs */ cmpdi r3,0 bge slb_miss_user_pseries #endif /* __DISABLED__ */ mfspr r12,SPRN_SRR1 #ifndef CONFIG_RELOCATABLE b .slb_miss_realmode #else mfctr r11 ld r10,PACAKBASE(r13) LOAD_HANDLER(r10, .slb_miss_realmode) mtctr r10 bctr #endif /* We open code these as we can't have a ". = x" (even with * x = "." within a feature section */ . = 0x500; .globl hardware_interrupt_pSeries; .globl hardware_interrupt_hv; hardware_interrupt_pSeries: hardware_interrupt_hv: HMT_MEDIUM_PPR_DISCARD BEGIN_FTR_SECTION _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502) FTR_SECTION_ELSE _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_HV_201) KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500) ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) STD_EXCEPTION_PSERIES(0x600, 0x600, alignment) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600) STD_EXCEPTION_PSERIES(0x700, 0x700, program_check) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700) STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800) . = 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_PR(PACA_EXGEN, EXC_STD, 0xa00) STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00) . = 0xc00 .globl system_call_pSeries system_call_pSeries: HMT_MEDIUM #ifdef CONFIG_KVM_BOOK3S_64_HANDLER SET_SCRATCH0(r13) GET_PACA(r13) std r9,PACA_EXGEN+EX_R9(r13) std r10,PACA_EXGEN+EX_R10(r13) mfcr r9 KVMTEST(0xc00) GET_SCRATCH0(r13) #endif SYSCALL_PSERIES_1 SYSCALL_PSERIES_2_RFID SYSCALL_PSERIES_3 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00) /* At 0xe??? we have a bunch of hypervisor exceptions, we branch * out of line to handle them */ . = 0xe00 hv_exception_trampoline: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_data_storage_hv . = 0xe20 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_instr_storage_hv . = 0xe40 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b emulation_assist_hv . = 0xe60 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b hmi_exception_hv . = 0xe80 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_doorbell_hv /* We need to deal with the Altivec unavailable exception * here which is at 0xf20, thus in the middle of the * prolog code of the PerformanceMonitor one. A little * trickery is thus necessary */ performance_monitor_pSeries_1: . = 0xf00 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b performance_monitor_pSeries altivec_unavailable_pSeries_1: . = 0xf20 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b altivec_unavailable_pSeries vsx_unavailable_pSeries_1: . = 0xf40 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b vsx_unavailable_pSeries . = 0xf60 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b tm_unavailable_pSeries #ifdef CONFIG_CBE_RAS STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202) #endif /* CONFIG_CBE_RAS */ STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint) KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300) . = 0x1500 .global denorm_exception_hv denorm_exception_hv: HMT_MEDIUM_PPR_DISCARD mtspr SPRN_SPRG_HSCRATCH0,r13 EXCEPTION_PROLOG_0(PACA_EXGEN) std r11,PACA_EXGEN+EX_R11(r13) std r12,PACA_EXGEN+EX_R12(r13) mfspr r9,SPRN_SPRG_HSCRATCH0 std r9,PACA_EXGEN+EX_R13(r13) mfcr r9 #ifdef CONFIG_PPC_DENORMALISATION mfspr r10,SPRN_HSRR1 mfspr r11,SPRN_HSRR0 /* save HSRR0 */ andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */ addi r11,r11,-4 /* HSRR0 is next instruction */ bne+ denorm_assist #endif EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500) #ifdef CONFIG_CBE_RAS STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602) #endif /* CONFIG_CBE_RAS */ STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700) #ifdef CONFIG_CBE_RAS STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802) #else . = 0x1800 #endif /* CONFIG_CBE_RAS */ /*** Out of line interrupts support ***/ .align 7 /* moved from 0x200 */ machine_check_pSeries: .globl machine_check_fwnmi machine_check_fwnmi: HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) /* save r13 */ EXCEPTION_PROLOG_0(PACA_EXMC) machine_check_pSeries_0: EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200) EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD) KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200) /* moved from 0x300 */ data_access_check_stab: GET_PACA(r13) std r9,PACA_EXSLB+EX_R9(r13) std r10,PACA_EXSLB+EX_R10(r13) mfspr r10,SPRN_DAR mfspr r9,SPRN_DSISR srdi r10,r10,60 rlwimi r10,r9,16,0x20 #ifdef CONFIG_KVM_BOOK3S_PR lbz r9,HSTATE_IN_GUEST(r13) rlwimi r10,r9,8,0x300 #endif mfcr r9 cmpwi r10,0x2c beq do_stab_bolted_pSeries mtcrf 0x80,r9 ld r9,PACA_EXSLB+EX_R9(r13) ld r10,PACA_EXSLB+EX_R10(r13) b data_access_not_stab do_stab_bolted_pSeries: std r11,PACA_EXSLB+EX_R11(r13) std r12,PACA_EXSLB+EX_R12(r13) GET_SCRATCH0(r10) std r10,PACA_EXSLB+EX_R13(r13) EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300) KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400) KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982) #ifdef CONFIG_PPC_DENORMALISATION denorm_assist: BEGIN_FTR_SECTION /* * To denormalise we need to move a copy of the register to itself. * For POWER6 do that here for all FP regs. */ mfmsr r10 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1) xori r10,r10,(MSR_FE0|MSR_FE1) mtmsrd r10 sync fmr 0,0 fmr 1,1 fmr 2,2 fmr 3,3 fmr 4,4 fmr 5,5 fmr 6,6 fmr 7,7 fmr 8,8 fmr 9,9 fmr 10,10 fmr 11,11 fmr 12,12 fmr 13,13 fmr 14,14 fmr 15,15 fmr 16,16 fmr 17,17 fmr 18,18 fmr 19,19 fmr 20,20 fmr 21,21 fmr 22,22 fmr 23,23 fmr 24,24 fmr 25,25 fmr 26,26 fmr 27,27 fmr 28,28 fmr 29,29 fmr 30,30 fmr 31,31 FTR_SECTION_ELSE /* * To denormalise we need to move a copy of the register to itself. * For POWER7 do that here for the first 32 VSX registers only. */ mfmsr r10 oris r10,r10,MSR_VSX@h mtmsrd r10 sync XVCPSGNDP(0,0,0) XVCPSGNDP(1,1,1) XVCPSGNDP(2,2,2) XVCPSGNDP(3,3,3) XVCPSGNDP(4,4,4) XVCPSGNDP(5,5,5) XVCPSGNDP(6,6,6) XVCPSGNDP(7,7,7) XVCPSGNDP(8,8,8) XVCPSGNDP(9,9,9) XVCPSGNDP(10,10,10) XVCPSGNDP(11,11,11) XVCPSGNDP(12,12,12) XVCPSGNDP(13,13,13) XVCPSGNDP(14,14,14) XVCPSGNDP(15,15,15) XVCPSGNDP(16,16,16) XVCPSGNDP(17,17,17) XVCPSGNDP(18,18,18) XVCPSGNDP(19,19,19) XVCPSGNDP(20,20,20) XVCPSGNDP(21,21,21) XVCPSGNDP(22,22,22) XVCPSGNDP(23,23,23) XVCPSGNDP(24,24,24) XVCPSGNDP(25,25,25) XVCPSGNDP(26,26,26) XVCPSGNDP(27,27,27) XVCPSGNDP(28,28,28) XVCPSGNDP(29,29,29) XVCPSGNDP(30,30,30) XVCPSGNDP(31,31,31) ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) mtspr SPRN_HSRR0,r11 mtcrf 0x80,r9 ld r9,PACA_EXGEN+EX_R9(r13) RESTORE_PPR_PACA(PACA_EXGEN, r10) ld r10,PACA_EXGEN+EX_R10(r13) ld r11,PACA_EXGEN+EX_R11(r13) ld r12,PACA_EXGEN+EX_R12(r13) ld r13,PACA_EXGEN+EX_R13(r13) HRFID b . #endif .align 7 /* moved from 0xe00 */ STD_EXCEPTION_HV_OOL(0xe02, h_data_storage) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02) STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22) STD_EXCEPTION_HV_OOL(0xe42, emulation_assist) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42) STD_EXCEPTION_HV_OOL(0xe62, hmi_exception) /* need to flush cache ? */ KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62) MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82) /* moved from 0xf00 */ STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00) STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20) STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40) STD_EXCEPTION_PSERIES_OOL(0xf60, tm_unavailable) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60) /* * An interrupt came in while soft-disabled. We set paca->irq_happened, then: * - If it was a decrementer interrupt, we bump the dec to max and and return. * - If it was a doorbell we return immediately since doorbells are edge * triggered and won't automatically refire. * - else we hard disable and return. * This is called with r10 containing the value to OR to the paca field. */ #define MASKED_INTERRUPT(_H) \ masked_##_H##interrupt: \ std r11,PACA_EXGEN+EX_R11(r13); \ lbz r11,PACAIRQHAPPENED(r13); \ or r11,r11,r10; \ stb r11,PACAIRQHAPPENED(r13); \ cmpwi r10,PACA_IRQ_DEC; \ bne 1f; \ lis r10,0x7fff; \ ori r10,r10,0xffff; \ mtspr SPRN_DEC,r10; \ b 2f; \ 1: cmpwi r10,PACA_IRQ_DBELL; \ beq 2f; \ mfspr r10,SPRN_##_H##SRR1; \ rldicl r10,r10,48,1; /* clear MSR_EE */ \ rotldi r10,r10,16; \ mtspr SPRN_##_H##SRR1,r10; \ 2: mtcrf 0x80,r9; \ ld r9,PACA_EXGEN+EX_R9(r13); \ ld r10,PACA_EXGEN+EX_R10(r13); \ ld r11,PACA_EXGEN+EX_R11(r13); \ GET_SCRATCH0(r13); \ ##_H##rfid; \ b . MASKED_INTERRUPT() MASKED_INTERRUPT(H) /* * Called from arch_local_irq_enable when an interrupt needs * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate * which kind of interrupt. MSR:EE is already off. We generate a * stackframe like if a real interrupt had happened. * * Note: While MSR:EE is off, we need to make sure that _MSR * in the generated frame has EE set to 1 or the exception * handler will not properly re-enable them. */ _GLOBAL(__replay_interrupt) /* We are going to jump to the exception common code which * will retrieve various register values from the PACA which * we don't give a damn about, so we don't bother storing them. */ mfmsr r12 mflr r11 mfcr r9 ori r12,r12,MSR_EE cmpwi r3,0x900 beq decrementer_common cmpwi r3,0x500 beq hardware_interrupt_common BEGIN_FTR_SECTION cmpwi r3,0xe80 beq h_doorbell_common FTR_SECTION_ELSE cmpwi r3,0xa00 beq doorbell_super_common ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) blr #ifdef CONFIG_PPC_PSERIES /* * Vectors for the FWNMI option. Share common code. */ .globl system_reset_fwnmi .align 7 system_reset_fwnmi: HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) /* save r13 */ EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD, NOTEST, 0x100) #endif /* CONFIG_PPC_PSERIES */ #ifdef __DISABLED__ /* * This is used for when the SLB miss handler has to go virtual, * which doesn't happen for now anymore but will once we re-implement * dynamic VSIDs for shared page tables */ slb_miss_user_pseries: std r10,PACA_EXGEN+EX_R10(r13) std r11,PACA_EXGEN+EX_R11(r13) std r12,PACA_EXGEN+EX_R12(r13) GET_SCRATCH0(r10) ld r11,PACA_EXSLB+EX_R9(r13) ld r12,PACA_EXSLB+EX_R3(r13) std r10,PACA_EXGEN+EX_R13(r13) std r11,PACA_EXGEN+EX_R9(r13) std r12,PACA_EXGEN+EX_R3(r13) clrrdi r12,r13,32 mfmsr r10 mfspr r11,SRR0 /* save SRR0 */ ori r12,r12,slb_miss_user_common@l /* virt addr of handler */ ori r10,r10,MSR_IR|MSR_DR|MSR_RI mtspr SRR0,r12 mfspr r12,SRR1 /* and SRR1 */ mtspr SRR1,r10 rfid b . /* prevent spec. execution */ #endif /* __DISABLED__ */ /* * Code from here down to __end_handlers is invoked from the * exception prologs above. Because the prologs assemble the * addresses of these handlers using the LOAD_HANDLER macro, * which uses an ori instruction, these handlers must be in * the first 64k of the kernel image. */ /*** Common interrupt handlers ***/ STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception) /* * Machine check is different because we use a different * save area: PACA_EXMC instead of PACA_EXGEN. */ .align 7 .globl machine_check_common machine_check_common: EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) FINISH_NAP DISABLE_INTS bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD bl .machine_check_exception b .ret_from_except STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ) STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt) STD_EXCEPTION_COMMON(0x980, hdecrementer, .hdec_interrupt) #ifdef CONFIG_PPC_DOORBELL STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .doorbell_exception) #else STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .unknown_exception) #endif STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception) STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception) STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception) STD_EXCEPTION_COMMON(0xe40, emulation_assist, .program_check_exception) STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception) #ifdef CONFIG_PPC_DOORBELL STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .doorbell_exception) #else STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .unknown_exception) #endif STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception) STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception) STD_EXCEPTION_COMMON(0x1502, denorm, .unknown_exception) #ifdef CONFIG_ALTIVEC STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception) #else STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception) #endif #ifdef CONFIG_CBE_RAS STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception) STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception) STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception) #endif /* CONFIG_CBE_RAS */ /* * Relocation-on interrupts: A subset of the interrupts can be delivered * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering * it. Addresses are the same as the original interrupt addresses, but * offset by 0xc000000000004000. * It's impossible to receive interrupts below 0x300 via this mechanism. * KVM: None of these traps are from the guest ; anything that escalated * to HV=1 from HV=0 is delivered via real mode handlers. */ /* * This uses the standard macro, since the original 0x300 vector * only has extra guff for STAB-based processors -- which never * come here. */ STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access) . = 0x4380 .globl data_access_slb_relon_pSeries data_access_slb_relon_pSeries: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380) std r3,PACA_EXSLB+EX_R3(r13) mfspr r3,SPRN_DAR mfspr r12,SPRN_SRR1 #ifndef CONFIG_RELOCATABLE b .slb_miss_realmode #else /* * We can't just use a direct branch to .slb_miss_realmode * because the distance from here to there depends on where * the kernel ends up being put. */ mfctr r11 ld r10,PACAKBASE(r13) LOAD_HANDLER(r10, .slb_miss_realmode) mtctr r10 bctr #endif STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access) . = 0x4480 .globl instruction_access_slb_relon_pSeries instruction_access_slb_relon_pSeries: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480) std r3,PACA_EXSLB+EX_R3(r13) mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ mfspr r12,SPRN_SRR1 #ifndef CONFIG_RELOCATABLE b .slb_miss_realmode #else mfctr r11 ld r10,PACAKBASE(r13) LOAD_HANDLER(r10, .slb_miss_realmode) mtctr r10 bctr #endif . = 0x4500 .globl hardware_interrupt_relon_pSeries; .globl hardware_interrupt_relon_hv; hardware_interrupt_relon_pSeries: hardware_interrupt_relon_hv: BEGIN_FTR_SECTION _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV) FTR_SECTION_ELSE _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR) ALT_FTR_SECTION_END_IFSET(CPU_FTR_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 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_data_storage_relon_hv . = 0x4e20 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_instr_storage_relon_hv . = 0x4e40 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b emulation_assist_relon_hv . = 0x4e60 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b hmi_exception_relon_hv . = 0x4e80 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b h_doorbell_relon_hv performance_monitor_relon_pSeries_1: . = 0x4f00 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b performance_monitor_relon_pSeries altivec_unavailable_relon_pSeries_1: . = 0x4f20 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b altivec_unavailable_relon_pSeries vsx_unavailable_relon_pSeries_1: . = 0x4f40 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b vsx_unavailable_relon_pSeries tm_unavailable_relon_pSeries_1: . = 0x4f60 SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b tm_unavailable_relon_pSeries STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint) #ifdef CONFIG_PPC_DENORMALISATION . = 0x5500 b denorm_exception_hv #endif STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist) /* Other future vectors */ .align 7 .globl __end_interrupts __end_interrupts: .align 7 system_call_entry_direct: #if defined(CONFIG_RELOCATABLE) /* The first level prologue may have used LR to get here, saving * orig in r10. To save hacking/ifdeffing common code, restore here. */ mtlr r10 #endif system_call_entry: b system_call_common ppc64_runlatch_on_trampoline: b .__ppc64_runlatch_on /* * Here we have detected that the kernel stack pointer is bad. * R9 contains the saved CR, r13 points to the paca, * r10 contains the (bad) kernel stack pointer, * r11 and r12 contain the saved SRR0 and SRR1. * We switch to using an emergency stack, save the registers there, * and call kernel_bad_stack(), which panics. */ bad_stack: ld r1,PACAEMERGSP(r13) subi r1,r1,64+INT_FRAME_SIZE std r9,_CCR(r1) std r10,GPR1(r1) std r11,_NIP(r1) std r12,_MSR(r1) mfspr r11,SPRN_DAR mfspr r12,SPRN_DSISR std r11,_DAR(r1) std r12,_DSISR(r1) mflr r10 mfctr r11 mfxer r12 std r10,_LINK(r1) std r11,_CTR(r1) std r12,_XER(r1) SAVE_GPR(0,r1) SAVE_GPR(2,r1) ld r10,EX_R3(r3) std r10,GPR3(r1) SAVE_GPR(4,r1) SAVE_4GPRS(5,r1) ld r9,EX_R9(r3) ld r10,EX_R10(r3) SAVE_2GPRS(9,r1) ld r9,EX_R11(r3) ld r10,EX_R12(r3) ld r11,EX_R13(r3) std r9,GPR11(r1) std r10,GPR12(r1) std r11,GPR13(r1) BEGIN_FTR_SECTION ld r10,EX_CFAR(r3) std r10,ORIG_GPR3(r1) END_FTR_SECTION_IFSET(CPU_FTR_CFAR) SAVE_8GPRS(14,r1) SAVE_10GPRS(22,r1) lhz r12,PACA_TRAP_SAVE(r13) std r12,_TRAP(r1) addi r11,r1,INT_FRAME_SIZE std r11,0(r1) li r12,0 std r12,0(r11) ld r2,PACATOC(r13) ld r11,exception_marker@toc(r2) std r12,RESULT(r1) std r11,STACK_FRAME_OVERHEAD-16(r1) 1: addi r3,r1,STACK_FRAME_OVERHEAD bl .kernel_bad_stack b 1b /* * Here r13 points to the paca, r9 contains the saved CR, * SRR0 and SRR1 are saved in r11 and r12, * r9 - r13 are saved in paca->exgen. */ .align 7 .globl data_access_common data_access_common: mfspr r10,SPRN_DAR std r10,PACA_EXGEN+EX_DAR(r13) mfspr r10,SPRN_DSISR stw r10,PACA_EXGEN+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) DISABLE_INTS ld r12,_MSR(r1) ld r3,PACA_EXGEN+EX_DAR(r13) lwz r4,PACA_EXGEN+EX_DSISR(r13) li r5,0x300 b .do_hash_page /* Try to handle as hpte fault */ .align 7 .globl h_data_storage_common h_data_storage_common: mfspr r10,SPRN_HDAR std r10,PACA_EXGEN+EX_DAR(r13) mfspr r10,SPRN_HDSISR stw r10,PACA_EXGEN+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN) bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .unknown_exception b .ret_from_except .align 7 .globl instruction_access_common instruction_access_common: EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) DISABLE_INTS ld r12,_MSR(r1) ld r3,_NIP(r1) andis. r4,r12,0x5820 li r5,0x400 b .do_hash_page /* Try to handle as hpte fault */ STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception) /* * Here is the common SLB miss user that is used when going to virtual * mode for SLB misses, that is currently not used */ #ifdef __DISABLED__ .align 7 .globl slb_miss_user_common slb_miss_user_common: mflr r10 std r3,PACA_EXGEN+EX_DAR(r13) stw r9,PACA_EXGEN+EX_CCR(r13) std r10,PACA_EXGEN+EX_LR(r13) std r11,PACA_EXGEN+EX_SRR0(r13) bl .slb_allocate_user ld r10,PACA_EXGEN+EX_LR(r13) ld r3,PACA_EXGEN+EX_R3(r13) lwz r9,PACA_EXGEN+EX_CCR(r13) ld r11,PACA_EXGEN+EX_SRR0(r13) mtlr r10 beq- slb_miss_fault andi. r10,r12,MSR_RI /* check for unrecoverable exception */ beq- unrecov_user_slb mfmsr r10 .machine push .machine "power4" mtcrf 0x80,r9 .machine pop clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */ mtmsrd r10,1 mtspr SRR0,r11 mtspr SRR1,r12 ld r9,PACA_EXGEN+EX_R9(r13) ld r10,PACA_EXGEN+EX_R10(r13) ld r11,PACA_EXGEN+EX_R11(r13) ld r12,PACA_EXGEN+EX_R12(r13) ld r13,PACA_EXGEN+EX_R13(r13) rfid b . slb_miss_fault: EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN) ld r4,PACA_EXGEN+EX_DAR(r13) li r5,0 std r4,_DAR(r1) std r5,_DSISR(r1) b handle_page_fault unrecov_user_slb: EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN) DISABLE_INTS bl .save_nvgprs 1: addi r3,r1,STACK_FRAME_OVERHEAD bl .unrecoverable_exception b 1b #endif /* __DISABLED__ */ .align 7 .globl alignment_common alignment_common: mfspr r10,SPRN_DAR std r10,PACA_EXGEN+EX_DAR(r13) mfspr r10,SPRN_DSISR stw r10,PACA_EXGEN+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) ld r3,PACA_EXGEN+EX_DAR(r13) lwz r4,PACA_EXGEN+EX_DSISR(r13) std r3,_DAR(r1) std r4,_DSISR(r1) bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .alignment_exception b .ret_from_except .align 7 .globl program_check_common program_check_common: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .program_check_exception b .ret_from_except .align 7 .globl fp_unavailable_common fp_unavailable_common: EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) bne 1f /* if from user, just load it up */ bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .kernel_fp_unavailable_exception BUG_OPCODE 1: #ifdef CONFIG_PPC_TRANSACTIONAL_MEM BEGIN_FTR_SECTION /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in * transaction), go do TM stuff */ rldicl. r0, r12, (64-MSR_TS_LG), (64-2) bne- 2f END_FTR_SECTION_IFSET(CPU_FTR_TM) #endif bl .load_up_fpu b fast_exception_return #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2: /* User process was in a transaction */ bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .fp_unavailable_tm b .ret_from_except #endif .align 7 .globl altivec_unavailable_common altivec_unavailable_common: EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) #ifdef CONFIG_ALTIVEC BEGIN_FTR_SECTION beq 1f #ifdef CONFIG_PPC_TRANSACTIONAL_MEM BEGIN_FTR_SECTION_NESTED(69) /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in * transaction), go do TM stuff */ rldicl. r0, r12, (64-MSR_TS_LG), (64-2) bne- 2f END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) #endif bl .load_up_altivec b fast_exception_return #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2: /* User process was in a transaction */ bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .altivec_unavailable_tm b .ret_from_except #endif 1: END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) #endif bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .altivec_unavailable_exception b .ret_from_except .align 7 .globl vsx_unavailable_common vsx_unavailable_common: EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) #ifdef CONFIG_VSX BEGIN_FTR_SECTION beq 1f #ifdef CONFIG_PPC_TRANSACTIONAL_MEM BEGIN_FTR_SECTION_NESTED(69) /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in * transaction), go do TM stuff */ rldicl. r0, r12, (64-MSR_TS_LG), (64-2) bne- 2f END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69) #endif b .load_up_vsx #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2: /* User process was in a transaction */ bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .vsx_unavailable_tm b .ret_from_except #endif 1: END_FTR_SECTION_IFSET(CPU_FTR_VSX) #endif bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .vsx_unavailable_exception b .ret_from_except .align 7 .globl tm_unavailable_common tm_unavailable_common: EXCEPTION_PROLOG_COMMON(0xf60, PACA_EXGEN) bl .save_nvgprs DISABLE_INTS addi r3,r1,STACK_FRAME_OVERHEAD bl .tm_unavailable_exception b .ret_from_except .align 7 .globl __end_handlers __end_handlers: /* Equivalents to the above handlers for relocation-on interrupt vectors */ STD_RELON_EXCEPTION_HV_OOL(0xe00, h_data_storage) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe00) STD_RELON_EXCEPTION_HV_OOL(0xe20, h_instr_storage) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe20) STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe40) STD_RELON_EXCEPTION_HV_OOL(0xe60, hmi_exception) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe60) MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell) KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe80) STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor) STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable) STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable) STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, tm_unavailable) #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) /* * Data area reserved for FWNMI option. * This address (0x7000) is fixed by the RPA. */ .= 0x7000 .globl fwnmi_data_area fwnmi_data_area: /* pseries and powernv need to keep the whole page from * 0x7000 to 0x8000 free for use by the firmware */ . = 0x8000 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */ /* Space for CPU0's segment table */ .balign 4096 .globl initial_stab initial_stab: .space 4096 #ifdef CONFIG_PPC_POWERNV _GLOBAL(opal_mc_secondary_handler) HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) GET_PACA(r13) clrldi r3,r3,2 tovirt(r3,r3) std r3,PACA_OPAL_MC_EVT(r13) ld r13,OPAL_MC_SRR0(r3) mtspr SPRN_SRR0,r13 ld r13,OPAL_MC_SRR1(r3) mtspr SPRN_SRR1,r13 ld r3,OPAL_MC_GPR3(r3) GET_SCRATCH0(r13) b machine_check_pSeries #endif /* CONFIG_PPC_POWERNV */ /* * r13 points to the PACA, r9 contains the saved CR, * r12 contain the saved SRR1, SRR0 is still ready for return * r3 has the faulting address * r9 - r13 are saved in paca->exslb. * r3 is saved in paca->slb_r3 * We assume we aren't going to take any exceptions during this procedure. */ _GLOBAL(slb_miss_realmode) mflr r10 #ifdef CONFIG_RELOCATABLE mtctr r11 #endif stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ bl .slb_allocate_realmode /* All done -- return from exception. */ ld r10,PACA_EXSLB+EX_LR(r13) ld r3,PACA_EXSLB+EX_R3(r13) lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ mtlr r10 andi. r10,r12,MSR_RI /* check for unrecoverable exception */ beq- 2f .machine push .machine "power4" mtcrf 0x80,r9 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ .machine pop RESTORE_PPR_PACA(PACA_EXSLB, r9) ld r9,PACA_EXSLB+EX_R9(r13) ld r10,PACA_EXSLB+EX_R10(r13) ld r11,PACA_EXSLB+EX_R11(r13) ld r12,PACA_EXSLB+EX_R12(r13) ld r13,PACA_EXSLB+EX_R13(r13) rfid b . /* prevent speculative execution */ 2: mfspr r11,SPRN_SRR0 ld r10,PACAKBASE(r13) LOAD_HANDLER(r10,unrecov_slb) mtspr SPRN_SRR0,r10 ld r10,PACAKMSR(r13) mtspr SPRN_SRR1,r10 rfid b . unrecov_slb: EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) DISABLE_INTS bl .save_nvgprs 1: addi r3,r1,STACK_FRAME_OVERHEAD bl .unrecoverable_exception b 1b #ifdef CONFIG_PPC_970_NAP power4_fixup_nap: andc r9,r9,r10 std r9,TI_LOCAL_FLAGS(r11) ld r10,_LINK(r1) /* make idle task do the */ std r10,_NIP(r1) /* equivalent of a blr */ blr #endif /* * Hash table stuff */ .align 7 _STATIC(do_hash_page) std r3,_DAR(r1) std r4,_DSISR(r1) andis. r0,r4,0xa410 /* weird error? */ bne- handle_page_fault /* if not, try to insert a HPTE */ andis. r0,r4,DSISR_DABRMATCH@h bne- handle_dabr_fault BEGIN_FTR_SECTION andis. r0,r4,0x0020 /* Is it a segment table fault? */ bne- do_ste_alloc /* If so handle it */ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB) CURRENT_THREAD_INFO(r11, r1) lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */ andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */ bne 77f /* then don't call hash_page now */ /* * We need to set the _PAGE_USER bit if MSR_PR is set or if we are * accessing a userspace segment (even from the kernel). We assume * kernel addresses always have the high bit set. */ rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */ rotldi r0,r3,15 /* Move high bit into MSR_PR posn */ orc r0,r12,r0 /* MSR_PR | ~high_bit */ rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */ ori r4,r4,1 /* add _PAGE_PRESENT */ rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */ /* * r3 contains the faulting address * r4 contains the required access permissions * r5 contains the trap number * * at return r3 = 0 for success, 1 for page fault, negative for error */ bl .hash_page /* build HPTE if possible */ cmpdi r3,0 /* see if hash_page succeeded */ /* Success */ beq fast_exc_return_irq /* Return from exception on success */ /* Error */ blt- 13f /* Here we have a page fault that hash_page can't handle. */ handle_page_fault: 11: ld r4,_DAR(r1) ld r5,_DSISR(r1) addi r3,r1,STACK_FRAME_OVERHEAD bl .do_page_fault cmpdi r3,0 beq+ 12f bl .save_nvgprs mr r5,r3 addi r3,r1,STACK_FRAME_OVERHEAD lwz r4,_DAR(r1) bl .bad_page_fault b .ret_from_except /* We have a data breakpoint exception - handle it */ handle_dabr_fault: bl .save_nvgprs ld r4,_DAR(r1) ld r5,_DSISR(r1) addi r3,r1,STACK_FRAME_OVERHEAD bl .do_break 12: b .ret_from_except_lite /* We have a page fault that hash_page could handle but HV refused * the PTE insertion */ 13: bl .save_nvgprs mr r5,r3 addi r3,r1,STACK_FRAME_OVERHEAD ld r4,_DAR(r1) bl .low_hash_fault b .ret_from_except /* * We come here as a result of a DSI at a point where we don't want * to call hash_page, such as when we are accessing memory (possibly * user memory) inside a PMU interrupt that occurred while interrupts * were soft-disabled. We want to invoke the exception handler for * the access, or panic if there isn't a handler. */ 77: bl .save_nvgprs mr r4,r3 addi r3,r1,STACK_FRAME_OVERHEAD li r5,SIGSEGV bl .bad_page_fault b .ret_from_except /* here we have a segment miss */ do_ste_alloc: bl .ste_allocate /* try to insert stab entry */ cmpdi r3,0 bne- handle_page_fault b fast_exception_return /* * r13 points to the PACA, r9 contains the saved CR, * r11 and r12 contain the saved SRR0 and SRR1. * r9 - r13 are saved in paca->exslb. * We assume we aren't going to take any exceptions during this procedure. * We assume (DAR >> 60) == 0xc. */ .align 7 _GLOBAL(do_stab_bolted) stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */ mfspr r11,SPRN_DAR /* ea */ /* * check for bad kernel/user address * (ea & ~REGION_MASK) >= PGTABLE_RANGE */ rldicr. r9,r11,4,(63 - 46 - 4) li r9,0 /* VSID = 0 for bad address */ bne- 0f /* * Calculate VSID: * This is the kernel vsid, we take the top for context from * the range. context = (MAX_USER_CONTEXT) + ((ea >> 60) - 0xc) + 1 * Here we know that (ea >> 60) == 0xc */ lis r9,(MAX_USER_CONTEXT + 1)@ha addi r9,r9,(MAX_USER_CONTEXT + 1)@l srdi r10,r11,SID_SHIFT rldimi r10,r9,ESID_BITS,0 /* proto vsid */ ASM_VSID_SCRAMBLE(r10, r9, 256M) rldic r9,r10,12,16 /* r9 = vsid << 12 */ 0: /* Hash to the primary group */ ld r10,PACASTABVIRT(r13) srdi r11,r11,SID_SHIFT rldimi r10,r11,7,52 /* r10 = first ste of the group */ /* 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 */