| /* |
| * This file contains the 64-bit "server" PowerPC variant |
| * of the low level exception handling including exception |
| * vectors, exception return, part of the slb and stab |
| * handling and other fixed offset specific things. |
| * |
| * This file is meant to be #included from head_64.S due to |
| * position dependent assembly. |
| * |
| * Most of this originates from head_64.S and thus has the same |
| * copyright history. |
| * |
| */ |
| |
| #include <asm/hw_irq.h> |
| #include <asm/exception-64s.h> |
| #include <asm/ptrace.h> |
| |
| /* |
| * We layout physical memory as follows: |
| * 0x0000 - 0x00ff : Secondary processor spin code |
| * 0x0100 - 0x2fff : pSeries Interrupt prologs |
| * 0x3000 - 0x5fff : interrupt support common interrupt prologs |
| * 0x6000 - 0x6fff : Initial (CPU0) segment table |
| * 0x7000 - 0x7fff : FWNMI data area |
| * 0x8000 - : Early init and support code |
| */ |
| |
| /* |
| * 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; |
| 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 |
| lbz r0,PACAPROCSTART(r13) |
| cmpwi r0,0x80 |
| bne 1f |
| li r0,1 |
| stb r0,PACAPROCSTART(r13) |
| 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 |
| */ |
| b machine_check_pSeries |
| |
| . = 0x300 |
| .globl data_access_pSeries |
| data_access_pSeries: |
| HMT_MEDIUM |
| SET_SCRATCH0(r13) |
| #ifndef CONFIG_POWER4_ONLY |
| BEGIN_FTR_SECTION |
| b data_access_check_stab |
| data_access_not_stab: |
| END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB) |
| #endif |
| EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD, |
| KVMTEST, 0x300) |
| |
| . = 0x380 |
| .globl data_access_slb_pSeries |
| data_access_slb_pSeries: |
| HMT_MEDIUM |
| SET_SCRATCH0(r13) |
| 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 |
| SET_SCRATCH0(r13) |
| EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480) |
| std r3,PACA_EXSLB+EX_R3(r13) |
| mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ |
| #ifdef __DISABLED__ |
| /* Keep that around for when we re-implement dynamic VSIDs */ |
| cmpdi r3,0 |
| bge slb_miss_user_pseries |
| #endif /* __DISABLED__ */ |
| mfspr r12,SPRN_SRR1 |
| #ifndef CONFIG_RELOCATABLE |
| b .slb_miss_realmode |
| #else |
| mfctr r11 |
| ld r10,PACAKBASE(r13) |
| LOAD_HANDLER(r10, .slb_miss_realmode) |
| mtctr r10 |
| bctr |
| #endif |
| |
| /* We open code these as we can't have a ". = x" (even with |
| * x = "." within a feature section |
| */ |
| . = 0x500; |
| .globl hardware_interrupt_pSeries; |
| .globl hardware_interrupt_hv; |
| hardware_interrupt_pSeries: |
| hardware_interrupt_hv: |
| BEGIN_FTR_SECTION |
| _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt, |
| EXC_HV, SOFTEN_TEST_HV) |
| KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502) |
| FTR_SECTION_ELSE |
| _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt, |
| EXC_STD, SOFTEN_TEST_HV_201) |
| KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500) |
| ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) |
| |
| STD_EXCEPTION_PSERIES(0x600, 0x600, alignment) |
| KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600) |
| |
| STD_EXCEPTION_PSERIES(0x700, 0x700, program_check) |
| KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700) |
| |
| STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable) |
| KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800) |
| |
| MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer) |
| MASKABLE_EXCEPTION_HV(0x980, 0x982, decrementer) |
| |
| STD_EXCEPTION_PSERIES(0xa00, 0xa00, trap_0a) |
| 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 |
| 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 |
| 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 */ |
| |
| KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) |
| |
| /* 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 . |
| |
| 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 |
| b h_data_storage_hv |
| . = 0xe20 |
| b h_instr_storage_hv |
| . = 0xe40 |
| b emulation_assist_hv |
| . = 0xe50 |
| b hmi_exception_hv |
| . = 0xe60 |
| b hmi_exception_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 |
| b performance_monitor_pSeries |
| |
| altivec_unavailable_pSeries_1: |
| . = 0xf20 |
| b altivec_unavailable_pSeries |
| |
| vsx_unavailable_pSeries_1: |
| . = 0xf40 |
| b vsx_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) |
| |
| #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) |
| #endif /* CONFIG_CBE_RAS */ |
| |
| . = 0x3000 |
| |
| /*** Out of line interrupts support ***/ |
| |
| /* moved from 0x200 */ |
| machine_check_pSeries: |
| .globl machine_check_fwnmi |
| machine_check_fwnmi: |
| HMT_MEDIUM |
| SET_SCRATCH0(r13) /* save r13 */ |
| EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common, |
| EXC_STD, KVMTEST, 0x200) |
| KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200) |
| |
| #ifndef CONFIG_POWER4_ONLY |
| /* 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) |
| #endif /* CONFIG_POWER4_ONLY */ |
| |
| 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) |
| |
| .align 7 |
| /* moved from 0xe00 */ |
| STD_EXCEPTION_HV(., 0xe02, h_data_storage) |
| KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02) |
| STD_EXCEPTION_HV(., 0xe22, h_instr_storage) |
| KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22) |
| STD_EXCEPTION_HV(., 0xe42, emulation_assist) |
| KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42) |
| STD_EXCEPTION_HV(., 0xe62, hmi_exception) /* need to flush cache ? */ |
| KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62) |
| |
| /* moved from 0xf00 */ |
| STD_EXCEPTION_PSERIES(., 0xf00, performance_monitor) |
| KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00) |
| STD_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable) |
| KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20) |
| STD_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable) |
| KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40) |
| |
| /* |
| * 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, 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); \ |
| andi. r10,r10,PACA_IRQ_DEC; \ |
| beq 1f; \ |
| lis r10,0x7fff; \ |
| ori r10,r10,0xffff; \ |
| mtspr SPRN_DEC,r10; \ |
| b 2f; \ |
| 1: 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 or 0x900 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 |
| 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 */ |