/* SPDX-License-Identifier: GPL-2.0 */ /* * 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 #include /* * There are a few constraints to be concerned with. * - Real mode exceptions code/data must be located at their physical location. * - Virtual mode exceptions must be mapped at their 0xc000... location. * - Fixed location code must not call directly beyond the __end_interrupts * area when built with CONFIG_RELOCATABLE. LOAD_HANDLER / bctr sequence * must be used. * - LOAD_HANDLER targets must be within first 64K of physical 0 / * virtual 0xc00... * - Conditional branch targets must be within +/-32K of caller. * * "Virtual exceptions" run with relocation on (MSR_IR=1, MSR_DR=1), and * therefore don't have to run in physically located code or rfid to * virtual mode kernel code. However on relocatable kernels they do have * to branch to KERNELBASE offset because the rest of the kernel (outside * the exception vectors) may be located elsewhere. * * Virtual exceptions correspond with physical, except their entry points * are offset by 0xc000000000000000 and also tend to get an added 0x4000 * offset applied. Virtual exceptions are enabled with the Alternate * Interrupt Location (AIL) bit set in the LPCR. However this does not * guarantee they will be delivered virtually. Some conditions (see the ISA) * cause exceptions to be delivered in real mode. * * It's impossible to receive interrupts below 0x300 via AIL. * * KVM: None of the virtual exceptions are from the guest. Anything that * escalated to HV=1 from HV=0 is delivered via real mode handlers. * * * We layout physical memory as follows: * 0x0000 - 0x00ff : Secondary processor spin code * 0x0100 - 0x18ff : Real mode pSeries interrupt vectors * 0x1900 - 0x3fff : Real mode trampolines * 0x4000 - 0x58ff : Relon (IR=1,DR=1) mode pSeries interrupt vectors * 0x5900 - 0x6fff : Relon mode trampolines * 0x7000 - 0x7fff : FWNMI data area * 0x8000 - .... : Common interrupt handlers, remaining early * setup code, rest of kernel. * * We could reclaim 0x4000-0x42ff for real mode trampolines if the space * is necessary. Until then it's more consistent to explicitly put VIRT_NONE * vectors there. */ OPEN_FIXED_SECTION(real_vectors, 0x0100, 0x1900) OPEN_FIXED_SECTION(real_trampolines, 0x1900, 0x4000) OPEN_FIXED_SECTION(virt_vectors, 0x4000, 0x5900) OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000) #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) /* * Data area reserved for FWNMI option. * This address (0x7000) is fixed by the RPA. * pseries and powernv need to keep the whole page from * 0x7000 to 0x8000 free for use by the firmware */ ZERO_FIXED_SECTION(fwnmi_page, 0x7000, 0x8000) OPEN_TEXT_SECTION(0x8000) #else OPEN_TEXT_SECTION(0x7000) #endif USE_FIXED_SECTION(real_vectors) /* * This is the start of the interrupt handlers for pSeries * This code runs with relocation off. * Code from here to __end_interrupts gets copied down to real * address 0x100 when we are running a relocatable kernel. * Therefore any relative branches in this section must only * branch to labels in this section. */ .globl __start_interrupts __start_interrupts: /* No virt vectors corresponding with 0x0..0x100 */ EXC_VIRT_NONE(0x4000, 0x100) #ifdef CONFIG_PPC_P7_NAP /* * If running native on arch 2.06 or later, check if we are waking up * from nap/sleep/winkle, and branch to idle handler. This tests SRR1 * bits 46:47. A non-0 value indicates that we are coming from a power * saving state. The idle wakeup handler initially runs in real mode, * but we branch to the 0xc000... address so we can turn on relocation * with mtmsr. */ #define IDLETEST(n) \ BEGIN_FTR_SECTION ; \ mfspr r10,SPRN_SRR1 ; \ rlwinm. r10,r10,47-31,30,31 ; \ beq- 1f ; \ cmpwi cr3,r10,2 ; \ BRANCH_TO_C000(r10, system_reset_idle_common) ; \ 1: \ KVMTEST_PR(n) ; \ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) #else #define IDLETEST NOTEST #endif EXC_REAL_BEGIN(system_reset, 0x100, 0x100) SET_SCRATCH0(r13) /* * MSR_RI is not enabled, because PACA_EXNMI and nmi stack is * being used, so a nested NMI exception would corrupt it. */ EXCEPTION_PROLOG_PSERIES_NORI(PACA_EXNMI, system_reset_common, EXC_STD, IDLETEST, 0x100) EXC_REAL_END(system_reset, 0x100, 0x100) EXC_VIRT_NONE(0x4100, 0x100) TRAMP_KVM(PACA_EXNMI, 0x100) #ifdef CONFIG_PPC_P7_NAP EXC_COMMON_BEGIN(system_reset_idle_common) mfspr r12,SPRN_SRR1 b pnv_powersave_wakeup #endif EXC_COMMON_BEGIN(system_reset_common) /* * Increment paca->in_nmi then enable MSR_RI. SLB or MCE will be able * to recover, but nested NMI will notice in_nmi and not recover * because of the use of the NMI stack. in_nmi reentrancy is tested in * system_reset_exception. */ lhz r10,PACA_IN_NMI(r13) addi r10,r10,1 sth r10,PACA_IN_NMI(r13) li r10,MSR_RI mtmsrd r10,1 mr r10,r1 ld r1,PACA_NMI_EMERG_SP(r13) subi r1,r1,INT_FRAME_SIZE EXCEPTION_COMMON_NORET_STACK(PACA_EXNMI, 0x100, system_reset, system_reset_exception, ADD_NVGPRS;ADD_RECONCILE) /* * The stack is no longer in use, decrement in_nmi. */ lhz r10,PACA_IN_NMI(r13) subi r10,r10,1 sth r10,PACA_IN_NMI(r13) b ret_from_except #ifdef CONFIG_PPC_PSERIES /* * Vectors for the FWNMI option. Share common code. */ TRAMP_REAL_BEGIN(system_reset_fwnmi) SET_SCRATCH0(r13) /* save r13 */ /* See comment at system_reset exception */ EXCEPTION_PROLOG_PSERIES_NORI(PACA_EXNMI, system_reset_common, EXC_STD, NOTEST, 0x100) #endif /* CONFIG_PPC_PSERIES */ EXC_REAL_BEGIN(machine_check, 0x200, 0x100) /* 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 */ EXCEPTION_PROLOG_0(PACA_EXMC) BEGIN_FTR_SECTION b machine_check_powernv_early FTR_SECTION_ELSE b machine_check_pSeries_0 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) EXC_REAL_END(machine_check, 0x200, 0x100) EXC_VIRT_NONE(0x4200, 0x100) TRAMP_REAL_BEGIN(machine_check_powernv_early) BEGIN_FTR_SECTION EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) /* * Register contents: * R13 = PACA * R9 = CR * Original R9 to R13 is saved on PACA_EXMC * * Switch to mc_emergency stack and handle re-entrancy (we limit * the nested MCE upto level 4 to avoid stack overflow). * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1 * * We use paca->in_mce to check whether this is the first entry or * nested machine check. We increment paca->in_mce to track nested * machine checks. * * If this is the first entry then set stack pointer to * paca->mc_emergency_sp, otherwise r1 is already pointing to * stack frame on mc_emergency stack. * * NOTE: We are here with MSR_ME=0 (off), which means we risk a * checkstop if we get another machine check exception before we do * rfid with MSR_ME=1. * * This interrupt can wake directly from idle. If that is the case, * the machine check is handled then the idle wakeup code is called * to restore state. In that case, the POWER9 DD1 idle PACA workaround * is not applied in the early machine check code, which will cause * bugs. */ 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,MAX_MCE_DEPTH bgt 2f /* Check if we hit limit of 4 */ std r11,GPR1(r1) /* Save r1 on the stack. */ std r11,0(r1) /* make stack chain pointer */ mfspr r11,SPRN_SRR0 /* Save SRR0 */ std r11,_NIP(r1) mfspr r11,SPRN_SRR1 /* Save SRR1 */ std r11,_MSR(r1) mfspr r11,SPRN_DAR /* Save DAR */ std r11,_DAR(r1) mfspr r11,SPRN_DSISR /* Save DSISR */ std r11,_DSISR(r1) std r9,_CCR(r1) /* Save CR in stackframe */ /* Save r9 through r13 from EXMC save area to stack frame. */ EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) mfmsr r11 /* get MSR value */ ori r11,r11,MSR_ME /* turn on ME bit */ ori r11,r11,MSR_RI /* turn on RI bit */ LOAD_HANDLER(r12, machine_check_handle_early) 1: mtspr SPRN_SRR0,r12 mtspr SPRN_SRR1,r11 RFI_TO_KERNEL b . /* prevent speculative execution */ 2: /* Stack overflow. Stay on emergency stack and panic. * Keep the ME bit off while panic-ing, so that if we hit * another machine check we checkstop. */ addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */ ld r11,PACAKMSR(r13) LOAD_HANDLER(r12, unrecover_mce) li r10,MSR_ME andc r11,r11,r10 /* Turn off MSR_ME */ b 1b b . /* prevent speculative execution */ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) TRAMP_REAL_BEGIN(machine_check_pSeries) .globl machine_check_fwnmi machine_check_fwnmi: SET_SCRATCH0(r13) /* save r13 */ EXCEPTION_PROLOG_0(PACA_EXMC) machine_check_pSeries_0: EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) /* * MSR_RI is not enabled, because PACA_EXMC is being used, so a * nested machine check corrupts it. machine_check_common enables * MSR_RI. */ EXCEPTION_PROLOG_PSERIES_1_NORI(machine_check_common, EXC_STD) TRAMP_KVM_SKIP(PACA_EXMC, 0x200) EXC_COMMON_BEGIN(machine_check_common) /* * Machine check is different because we use a different * save area: PACA_EXMC instead of PACA_EXGEN. */ mfspr r10,SPRN_DAR std r10,PACA_EXMC+EX_DAR(r13) mfspr r10,SPRN_DSISR stw r10,PACA_EXMC+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) FINISH_NAP RECONCILE_IRQ_STATE(r10, r11) ld r3,PACA_EXMC+EX_DAR(r13) lwz r4,PACA_EXMC+EX_DSISR(r13) /* Enable MSR_RI when finished with PACA_EXMC */ li r10,MSR_RI mtmsrd r10,1 std r3,_DAR(r1) std r4,_DSISR(r1) bl save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD bl machine_check_exception b ret_from_except #define MACHINE_CHECK_HANDLER_WINDUP \ /* Clear MSR_RI before setting SRR0 and SRR1. */\ li r0,MSR_RI; \ mfmsr r9; /* get MSR value */ \ andc r9,r9,r0; \ mtmsrd r9,1; /* Clear MSR_RI */ \ /* Move original SRR0 and SRR1 into the respective regs */ \ ld r9,_MSR(r1); \ mtspr SPRN_SRR1,r9; \ ld r3,_NIP(r1); \ mtspr SPRN_SRR0,r3; \ ld r9,_CTR(r1); \ mtctr r9; \ ld r9,_XER(r1); \ mtxer r9; \ ld r9,_LINK(r1); \ mtlr r9; \ REST_GPR(0, r1); \ REST_8GPRS(2, r1); \ REST_GPR(10, r1); \ ld r11,_CCR(r1); \ mtcr r11; \ /* Decrement paca->in_mce. */ \ lhz r12,PACA_IN_MCE(r13); \ subi r12,r12,1; \ sth r12,PACA_IN_MCE(r13); \ REST_GPR(11, r1); \ REST_2GPRS(12, r1); \ /* restore original r1. */ \ ld r1,GPR1(r1) #ifdef CONFIG_PPC_P7_NAP /* * This is an idle wakeup. Low level machine check has already been * done. Queue the event then call the idle code to do the wake up. */ EXC_COMMON_BEGIN(machine_check_idle_common) bl machine_check_queue_event /* * We have not used any non-volatile GPRs here, and as a rule * most exception code including machine check does not. * Therefore PACA_NAPSTATELOST does not need to be set. Idle * wakeup will restore volatile registers. * * Load the original SRR1 into r3 for pnv_powersave_wakeup_mce. * * Then decrement MCE nesting after finishing with the stack. */ ld r3,_MSR(r1) lhz r11,PACA_IN_MCE(r13) subi r11,r11,1 sth r11,PACA_IN_MCE(r13) /* Turn off the RI bit because SRR1 is used by idle wakeup code. */ /* Recoverability could be improved by reducing the use of SRR1. */ li r11,0 mtmsrd r11,1 b pnv_powersave_wakeup_mce #endif /* * Handle machine check early in real mode. We come here with * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack. */ EXC_COMMON_BEGIN(machine_check_handle_early) std r0,GPR0(r1) /* Save r0 */ EXCEPTION_PROLOG_COMMON_3(0x200) bl save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD bl machine_check_early std r3,RESULT(r1) /* Save result */ ld r12,_MSR(r1) #ifdef 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, * supervisor state loss or hypervisor state loss. * * Go back to nap/sleep/winkle mode again if (b) is true. */ BEGIN_FTR_SECTION rlwinm. r11,r12,47-31,30,31 bne machine_check_idle_common END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) #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 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 RFI_TO_KERNEL 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 RFI_TO_USER_OR_KERNEL 9: /* Deliver the machine check to host kernel in V mode. */ MACHINE_CHECK_HANDLER_WINDUP b machine_check_pSeries EXC_COMMON_BEGIN(unrecover_mce) /* Invoke machine_check_exception to print MCE event and panic. */ addi r3,r1,STACK_FRAME_OVERHEAD bl machine_check_exception /* * We will not reach here. Even if we did, there is no way out. Call * unrecoverable_exception and die. */ 1: addi r3,r1,STACK_FRAME_OVERHEAD bl unrecoverable_exception b 1b EXC_REAL(data_access, 0x300, 0x80) EXC_VIRT(data_access, 0x4300, 0x80, 0x300) TRAMP_KVM_SKIP(PACA_EXGEN, 0x300) EXC_COMMON_BEGIN(data_access_common) /* * Here r13 points to the paca, r9 contains the saved CR, * SRR0 and SRR1 are saved in r11 and r12, * r9 - r13 are saved in paca->exgen. */ mfspr r10,SPRN_DAR std r10,PACA_EXGEN+EX_DAR(r13) mfspr r10,SPRN_DSISR stw r10,PACA_EXGEN+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) RECONCILE_IRQ_STATE(r10, r11) ld r12,_MSR(r1) ld r3,PACA_EXGEN+EX_DAR(r13) lwz r4,PACA_EXGEN+EX_DSISR(r13) li r5,0x300 std r3,_DAR(r1) std r4,_DSISR(r1) BEGIN_MMU_FTR_SECTION b do_hash_page /* Try to handle as hpte fault */ MMU_FTR_SECTION_ELSE b handle_page_fault ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80) SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380) mr r12,r3 /* save r3 */ mfspr r3,SPRN_DAR mfspr r11,SPRN_SRR1 crset 4*cr6+eq BRANCH_TO_COMMON(r10, slb_miss_common) EXC_REAL_END(data_access_slb, 0x380, 0x80) EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80) SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380) mr r12,r3 /* save r3 */ mfspr r3,SPRN_DAR mfspr r11,SPRN_SRR1 crset 4*cr6+eq BRANCH_TO_COMMON(r10, slb_miss_common) EXC_VIRT_END(data_access_slb, 0x4380, 0x80) TRAMP_KVM_SKIP(PACA_EXSLB, 0x380) EXC_REAL(instruction_access, 0x400, 0x80) EXC_VIRT(instruction_access, 0x4400, 0x80, 0x400) TRAMP_KVM(PACA_EXGEN, 0x400) EXC_COMMON_BEGIN(instruction_access_common) EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) RECONCILE_IRQ_STATE(r10, r11) ld r12,_MSR(r1) ld r3,_NIP(r1) andis. r4,r12,DSISR_SRR1_MATCH_64S@h li r5,0x400 std r3,_DAR(r1) std r4,_DSISR(r1) BEGIN_MMU_FTR_SECTION b do_hash_page /* Try to handle as hpte fault */ MMU_FTR_SECTION_ELSE b handle_page_fault ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80) SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480) mr r12,r3 /* save r3 */ mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ mfspr r11,SPRN_SRR1 crclr 4*cr6+eq BRANCH_TO_COMMON(r10, slb_miss_common) EXC_REAL_END(instruction_access_slb, 0x480, 0x80) EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80) SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXSLB) EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480) mr r12,r3 /* save r3 */ mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ mfspr r11,SPRN_SRR1 crclr 4*cr6+eq BRANCH_TO_COMMON(r10, slb_miss_common) EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80) TRAMP_KVM(PACA_EXSLB, 0x480) /* * This handler is used by the 0x380 and 0x480 SLB miss interrupts, as well as * the virtual mode 0x4380 and 0x4480 interrupts if AIL is enabled. */ EXC_COMMON_BEGIN(slb_miss_common) /* * r13 points to the PACA, r9 contains the saved CR, * r12 contains the saved r3, * r11 contain the saved SRR1, SRR0 is still ready for return * r3 has the faulting address * r9 - r13 are saved in paca->exslb. * cr6.eq is set for a D-SLB miss, clear for a I-SLB miss * We assume we aren't going to take any exceptions during this * procedure. */ mflr r10 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ andi. r9,r11,MSR_PR // Check for exception from userspace cmpdi cr4,r9,MSR_PR // And save the result in CR4 for later /* * Test MSR_RI before calling slb_allocate_realmode, because the * MSR in r11 gets clobbered. However we still want to allocate * SLB in case MSR_RI=0, to minimise the risk of getting stuck in * recursive SLB faults. So use cr5 for this, which is preserved. */ andi. r11,r11,MSR_RI /* check for unrecoverable exception */ cmpdi cr5,r11,MSR_RI crset 4*cr0+eq #ifdef CONFIG_PPC_BOOK3S_64 BEGIN_MMU_FTR_SECTION bl slb_allocate END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX) #endif ld r10,PACA_EXSLB+EX_LR(r13) lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ mtlr r10 beq- 8f /* if bad address, make full stack frame */ bne- cr5,2f /* if unrecoverable exception, oops */ /* All done -- return from exception. */ bne cr4,1f /* returning to kernel */ .machine push .machine "power4" mtcrf 0x80,r9 mtcrf 0x08,r9 /* MSR[PR] indication is in cr4 */ mtcrf 0x04,r9 /* MSR[RI] indication is in cr5 */ mtcrf 0x02,r9 /* I/D indication is in cr6 */ mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ .machine pop RESTORE_CTR(r9, PACA_EXSLB) RESTORE_PPR_PACA(PACA_EXSLB, r9) mr r3,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) RFI_TO_USER b . /* prevent speculative execution */ 1: .machine push .machine "power4" mtcrf 0x80,r9 mtcrf 0x08,r9 /* MSR[PR] indication is in cr4 */ mtcrf 0x04,r9 /* MSR[RI] indication is in cr5 */ mtcrf 0x02,r9 /* I/D indication is in cr6 */ mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ .machine pop RESTORE_CTR(r9, PACA_EXSLB) RESTORE_PPR_PACA(PACA_EXSLB, r9) mr r3,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) RFI_TO_KERNEL b . /* prevent speculative execution */ 2: std r3,PACA_EXSLB+EX_DAR(r13) mr r3,r12 mfspr r11,SPRN_SRR0 mfspr r12,SPRN_SRR1 LOAD_HANDLER(r10,unrecov_slb) mtspr SPRN_SRR0,r10 ld r10,PACAKMSR(r13) mtspr SPRN_SRR1,r10 RFI_TO_KERNEL b . 8: std r3,PACA_EXSLB+EX_DAR(r13) mr r3,r12 mfspr r11,SPRN_SRR0 mfspr r12,SPRN_SRR1 LOAD_HANDLER(r10,bad_addr_slb) mtspr SPRN_SRR0,r10 ld r10,PACAKMSR(r13) mtspr SPRN_SRR1,r10 RFI_TO_KERNEL b . EXC_COMMON_BEGIN(unrecov_slb) EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) RECONCILE_IRQ_STATE(r10, r11) bl save_nvgprs 1: addi r3,r1,STACK_FRAME_OVERHEAD bl unrecoverable_exception b 1b EXC_COMMON_BEGIN(bad_addr_slb) EXCEPTION_PROLOG_COMMON(0x380, PACA_EXSLB) RECONCILE_IRQ_STATE(r10, r11) ld r3, PACA_EXSLB+EX_DAR(r13) std r3, _DAR(r1) beq cr6, 2f li r10, 0x480 /* fix trap number for I-SLB miss */ std r10, _TRAP(r1) 2: bl save_nvgprs addi r3, r1, STACK_FRAME_OVERHEAD bl slb_miss_bad_addr b ret_from_except EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100) .globl hardware_interrupt_hv; hardware_interrupt_hv: BEGIN_FTR_SECTION _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_HV, SOFTEN_TEST_HV) FTR_SECTION_ELSE _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_STD, SOFTEN_TEST_PR) ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) EXC_REAL_END(hardware_interrupt, 0x500, 0x100) EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100) .globl hardware_interrupt_relon_hv; hardware_interrupt_relon_hv: BEGIN_FTR_SECTION _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_HV, SOFTEN_TEST_HV) FTR_SECTION_ELSE _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_STD, SOFTEN_TEST_PR) ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100) TRAMP_KVM(PACA_EXGEN, 0x500) TRAMP_KVM_HV(PACA_EXGEN, 0x500) EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ) EXC_REAL(alignment, 0x600, 0x100) EXC_VIRT(alignment, 0x4600, 0x100, 0x600) TRAMP_KVM(PACA_EXGEN, 0x600) EXC_COMMON_BEGIN(alignment_common) mfspr r10,SPRN_DAR std r10,PACA_EXGEN+EX_DAR(r13) mfspr r10,SPRN_DSISR stw r10,PACA_EXGEN+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) ld r3,PACA_EXGEN+EX_DAR(r13) lwz r4,PACA_EXGEN+EX_DSISR(r13) std r3,_DAR(r1) std r4,_DSISR(r1) bl save_nvgprs RECONCILE_IRQ_STATE(r10, r11) addi r3,r1,STACK_FRAME_OVERHEAD bl alignment_exception b ret_from_except EXC_REAL(program_check, 0x700, 0x100) EXC_VIRT(program_check, 0x4700, 0x100, 0x700) TRAMP_KVM(PACA_EXGEN, 0x700) EXC_COMMON_BEGIN(program_check_common) /* * It's possible to receive a TM Bad Thing type program check with * userspace register values (in particular r1), but with SRR1 reporting * that we came from the kernel. Normally that would confuse the bad * stack logic, and we would report a bad kernel stack pointer. Instead * we switch to the emergency stack if we're taking a TM Bad Thing from * the kernel. */ li r10,MSR_PR /* Build a mask of MSR_PR .. */ oris r10,r10,0x200000@h /* .. and SRR1_PROGTM */ and r10,r10,r12 /* Mask SRR1 with that. */ srdi r10,r10,8 /* Shift it so we can compare */ cmpldi r10,(0x200000 >> 8) /* .. with an immediate. */ bne 1f /* If != go to normal path. */ /* SRR1 had PR=0 and SRR1_PROGTM=1, so use the emergency stack */ andi. r10,r12,MSR_PR; /* Set CR0 correctly for label */ /* 3 in EXCEPTION_PROLOG_COMMON */ mr r10,r1 /* Save r1 */ ld r1,PACAEMERGSP(r13) /* Use emergency stack */ subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ b 3f /* Jump into the macro !! */ 1: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) bl save_nvgprs RECONCILE_IRQ_STATE(r10, r11) addi r3,r1,STACK_FRAME_OVERHEAD bl program_check_exception b ret_from_except EXC_REAL(fp_unavailable, 0x800, 0x100) EXC_VIRT(fp_unavailable, 0x4800, 0x100, 0x800) TRAMP_KVM(PACA_EXGEN, 0x800) EXC_COMMON_BEGIN(fp_unavailable_common) EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) bne 1f /* if from user, just load it up */ bl save_nvgprs RECONCILE_IRQ_STATE(r10, r11) addi r3,r1,STACK_FRAME_OVERHEAD bl kernel_fp_unavailable_exception BUG_OPCODE 1: #ifdef 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 EXC_REAL_MASKABLE(decrementer, 0x900, 0x80) EXC_VIRT_MASKABLE(decrementer, 0x4900, 0x80, 0x900) TRAMP_KVM(PACA_EXGEN, 0x900) EXC_COMMON_ASYNC(decrementer_common, 0x900, timer_interrupt) EXC_REAL_HV(hdecrementer, 0x980, 0x80) EXC_VIRT_HV(hdecrementer, 0x4980, 0x80, 0x980) TRAMP_KVM_HV(PACA_EXGEN, 0x980) EXC_COMMON(hdecrementer_common, 0x980, hdec_interrupt) EXC_REAL_MASKABLE(doorbell_super, 0xa00, 0x100) EXC_VIRT_MASKABLE(doorbell_super, 0x4a00, 0x100, 0xa00) TRAMP_KVM(PACA_EXGEN, 0xa00) #ifdef CONFIG_PPC_DOORBELL EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, doorbell_exception) #else EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, unknown_exception) #endif EXC_REAL(trap_0b, 0xb00, 0x100) EXC_VIRT(trap_0b, 0x4b00, 0x100, 0xb00) TRAMP_KVM(PACA_EXGEN, 0xb00) EXC_COMMON(trap_0b_common, 0xb00, unknown_exception) /* * system call / hypercall (0xc00, 0x4c00) * * The system call exception is invoked with "sc 0" and does not alter HV bit. * There is support for kernel code to invoke system calls but there are no * in-tree users. * * The hypercall is invoked with "sc 1" and sets HV=1. * * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to * 0x4c00 virtual mode. * * Call convention: * * syscall register convention is in Documentation/powerpc/syscall64-abi.txt * * For hypercalls, the register convention is as follows: * r0 volatile * r1-2 nonvolatile * r3 volatile parameter and return value for status * r4-r10 volatile input and output value * r11 volatile hypercall number and output value * r12 volatile input and output value * r13-r31 nonvolatile * LR nonvolatile * CTR volatile * XER volatile * CR0-1 CR5-7 volatile * CR2-4 nonvolatile * Other registers nonvolatile * * The intersection of volatile registers that don't contain possible * inputs is: cr0, xer, ctr. We may use these as scratch regs upon entry * without saving, though xer is not a good idea to use, as hardware may * interpret some bits so it may be costly to change them. */ #ifdef CONFIG_KVM_BOOK3S_64_HANDLER /* * There is a little bit of juggling to get syscall and hcall * working well. Save r13 in ctr to avoid using SPRG scratch * register. * * Userspace syscalls have already saved the PPR, hcalls must save * it before setting HMT_MEDIUM. */ #define SYSCALL_KVMTEST \ mtctr r13; \ GET_PACA(r13); \ std r10,PACA_EXGEN+EX_R10(r13); \ KVMTEST_PR(0xc00); /* uses r10, branch to do_kvm_0xc00_system_call */ \ HMT_MEDIUM; \ mfctr r9; #else #define SYSCALL_KVMTEST \ HMT_MEDIUM; \ mr r9,r13; \ GET_PACA(r13); #endif #define LOAD_SYSCALL_HANDLER(reg) \ __LOAD_HANDLER(reg, system_call_common) /* * After SYSCALL_KVMTEST, we reach here with PACA in r13, r13 in r9, * and HMT_MEDIUM. */ #define SYSCALL_REAL \ mfspr r11,SPRN_SRR0 ; \ mfspr r12,SPRN_SRR1 ; \ LOAD_SYSCALL_HANDLER(r10) ; \ mtspr SPRN_SRR0,r10 ; \ ld r10,PACAKMSR(r13) ; \ mtspr SPRN_SRR1,r10 ; \ RFI_TO_KERNEL ; \ b . ; /* prevent speculative execution */ #ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH #define SYSCALL_FASTENDIAN_TEST \ BEGIN_FTR_SECTION \ cmpdi r0,0x1ebe ; \ beq- 1f ; \ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \ #define SYSCALL_FASTENDIAN \ /* Fast LE/BE switch system call */ \ 1: mfspr r12,SPRN_SRR1 ; \ xori r12,r12,MSR_LE ; \ mtspr SPRN_SRR1,r12 ; \ mr r13,r9 ; \ RFI_TO_USER ; /* return to userspace */ \ b . ; /* prevent speculative execution */ #else #define SYSCALL_FASTENDIAN_TEST #define SYSCALL_FASTENDIAN #endif /* CONFIG_PPC_FAST_ENDIAN_SWITCH */ #if defined(CONFIG_RELOCATABLE) /* * We can't branch directly so we do it via the CTR which * is volatile across system calls. */ #define SYSCALL_VIRT \ LOAD_SYSCALL_HANDLER(r10) ; \ mtctr r10 ; \ mfspr r11,SPRN_SRR0 ; \ mfspr r12,SPRN_SRR1 ; \ li r10,MSR_RI ; \ mtmsrd r10,1 ; \ bctr ; #else /* We can branch directly */ #define SYSCALL_VIRT \ mfspr r11,SPRN_SRR0 ; \ mfspr r12,SPRN_SRR1 ; \ li r10,MSR_RI ; \ mtmsrd r10,1 ; /* Set RI (EE=0) */ \ b system_call_common ; #endif EXC_REAL_BEGIN(system_call, 0xc00, 0x100) SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */ SYSCALL_FASTENDIAN_TEST SYSCALL_REAL SYSCALL_FASTENDIAN EXC_REAL_END(system_call, 0xc00, 0x100) EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100) SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */ SYSCALL_FASTENDIAN_TEST SYSCALL_VIRT SYSCALL_FASTENDIAN EXC_VIRT_END(system_call, 0x4c00, 0x100) #ifdef CONFIG_KVM_BOOK3S_64_HANDLER /* * This is a hcall, so register convention is as above, with these * differences: * r13 = PACA * ctr = orig r13 * orig r10 saved in PACA */ TRAMP_KVM_BEGIN(do_kvm_0xc00) /* * 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). */ OPT_GET_SPR(r10, SPRN_PPR, CPU_FTR_HAS_PPR) HMT_MEDIUM OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r10, CPU_FTR_HAS_PPR) mfctr r10 SET_SCRATCH0(r10) std r9,PACA_EXGEN+EX_R9(r13) mfcr r9 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) #endif EXC_REAL(single_step, 0xd00, 0x100) EXC_VIRT(single_step, 0x4d00, 0x100, 0xd00) TRAMP_KVM(PACA_EXGEN, 0xd00) EXC_COMMON(single_step_common, 0xd00, single_step_exception) EXC_REAL_OOL_HV(h_data_storage, 0xe00, 0x20) EXC_VIRT_OOL_HV(h_data_storage, 0x4e00, 0x20, 0xe00) TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00) EXC_COMMON_BEGIN(h_data_storage_common) mfspr r10,SPRN_HDAR std r10,PACA_EXGEN+EX_DAR(r13) mfspr r10,SPRN_HDSISR stw r10,PACA_EXGEN+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN) bl save_nvgprs RECONCILE_IRQ_STATE(r10, r11) addi r3,r1,STACK_FRAME_OVERHEAD bl unknown_exception b ret_from_except EXC_REAL_OOL_HV(h_instr_storage, 0xe20, 0x20) EXC_VIRT_OOL_HV(h_instr_storage, 0x4e20, 0x20, 0xe20) TRAMP_KVM_HV(PACA_EXGEN, 0xe20) EXC_COMMON(h_instr_storage_common, 0xe20, unknown_exception) EXC_REAL_OOL_HV(emulation_assist, 0xe40, 0x20) EXC_VIRT_OOL_HV(emulation_assist, 0x4e40, 0x20, 0xe40) TRAMP_KVM_HV(PACA_EXGEN, 0xe40) EXC_COMMON(emulation_assist_common, 0xe40, emulation_assist_interrupt) /* * hmi_exception trampoline is a special case. It jumps to hmi_exception_early * first, and then eventaully from there to the trampoline to get into virtual * mode. */ __EXC_REAL_OOL_HV_DIRECT(hmi_exception, 0xe60, 0x20, hmi_exception_early) __TRAMP_REAL_OOL_MASKABLE_HV(hmi_exception, 0xe60) EXC_VIRT_NONE(0x4e60, 0x20) TRAMP_KVM_HV(PACA_EXGEN, 0xe60) TRAMP_REAL_BEGIN(hmi_exception_early) EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, 0xe60) mr r10,r1 /* Save r1 */ ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */ subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ mfspr r11,SPRN_HSRR0 /* Save HSRR0 */ mfspr r12,SPRN_HSRR1 /* Save HSRR1 */ EXCEPTION_PROLOG_COMMON_1() EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN) EXCEPTION_PROLOG_COMMON_3(0xe60) addi r3,r1,STACK_FRAME_OVERHEAD BRANCH_LINK_TO_FAR(hmi_exception_realmode) /* Function call ABI */ cmpdi cr0,r3,0 /* 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) REST_2GPRS(12, r1) bne 1f mtcr r11 REST_GPR(11, r1) ld r1,GPR1(r1) HRFI_TO_USER_OR_KERNEL 1: mtcr r11 REST_GPR(11, r1) ld r1,GPR1(r1) /* * Go to virtual mode and pull the HMI event information from * firmware. */ .globl hmi_exception_after_realmode hmi_exception_after_realmode: SET_SCRATCH0(r13) EXCEPTION_PROLOG_0(PACA_EXGEN) b tramp_real_hmi_exception EXC_COMMON_BEGIN(hmi_exception_common) EXCEPTION_COMMON(PACA_EXGEN, 0xe60, hmi_exception_common, handle_hmi_exception, ret_from_except, FINISH_NAP;ADD_NVGPRS;ADD_RECONCILE;RUNLATCH_ON) EXC_REAL_OOL_MASKABLE_HV(h_doorbell, 0xe80, 0x20) EXC_VIRT_OOL_MASKABLE_HV(h_doorbell, 0x4e80, 0x20, 0xe80) TRAMP_KVM_HV(PACA_EXGEN, 0xe80) #ifdef CONFIG_PPC_DOORBELL EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, doorbell_exception) #else EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, unknown_exception) #endif EXC_REAL_OOL_MASKABLE_HV(h_virt_irq, 0xea0, 0x20) EXC_VIRT_OOL_MASKABLE_HV(h_virt_irq, 0x4ea0, 0x20, 0xea0) TRAMP_KVM_HV(PACA_EXGEN, 0xea0) EXC_COMMON_ASYNC(h_virt_irq_common, 0xea0, do_IRQ) EXC_REAL_NONE(0xec0, 0x20) EXC_VIRT_NONE(0x4ec0, 0x20) EXC_REAL_NONE(0xee0, 0x20) EXC_VIRT_NONE(0x4ee0, 0x20) EXC_REAL_OOL(performance_monitor, 0xf00, 0x20) EXC_VIRT_OOL(performance_monitor, 0x4f00, 0x20, 0xf00) TRAMP_KVM(PACA_EXGEN, 0xf00) EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception) EXC_REAL_OOL(altivec_unavailable, 0xf20, 0x20) EXC_VIRT_OOL(altivec_unavailable, 0x4f20, 0x20, 0xf20) TRAMP_KVM(PACA_EXGEN, 0xf20) EXC_COMMON_BEGIN(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 EXC_REAL_OOL(vsx_unavailable, 0xf40, 0x20) EXC_VIRT_OOL(vsx_unavailable, 0x4f40, 0x20, 0xf40) TRAMP_KVM(PACA_EXGEN, 0xf40) EXC_COMMON_BEGIN(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 EXC_REAL_OOL(facility_unavailable, 0xf60, 0x20) EXC_VIRT_OOL(facility_unavailable, 0x4f60, 0x20, 0xf60) TRAMP_KVM(PACA_EXGEN, 0xf60) EXC_COMMON(facility_unavailable_common, 0xf60, facility_unavailable_exception) EXC_REAL_OOL_HV(h_facility_unavailable, 0xf80, 0x20) EXC_VIRT_OOL_HV(h_facility_unavailable, 0x4f80, 0x20, 0xf80) TRAMP_KVM_HV(PACA_EXGEN, 0xf80) EXC_COMMON(h_facility_unavailable_common, 0xf80, facility_unavailable_exception) EXC_REAL_NONE(0xfa0, 0x20) EXC_VIRT_NONE(0x4fa0, 0x20) EXC_REAL_NONE(0xfc0, 0x20) EXC_VIRT_NONE(0x4fc0, 0x20) EXC_REAL_NONE(0xfe0, 0x20) EXC_VIRT_NONE(0x4fe0, 0x20) EXC_REAL_NONE(0x1000, 0x100) EXC_VIRT_NONE(0x5000, 0x100) EXC_REAL_NONE(0x1100, 0x100) EXC_VIRT_NONE(0x5100, 0x100) #ifdef CONFIG_CBE_RAS EXC_REAL_HV(cbe_system_error, 0x1200, 0x100) EXC_VIRT_NONE(0x5200, 0x100) TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1200) EXC_COMMON(cbe_system_error_common, 0x1200, cbe_system_error_exception) #else /* CONFIG_CBE_RAS */ EXC_REAL_NONE(0x1200, 0x100) EXC_VIRT_NONE(0x5200, 0x100) #endif EXC_REAL(instruction_breakpoint, 0x1300, 0x100) EXC_VIRT(instruction_breakpoint, 0x5300, 0x100, 0x1300) TRAMP_KVM_SKIP(PACA_EXGEN, 0x1300) EXC_COMMON(instruction_breakpoint_common, 0x1300, instruction_breakpoint_exception) EXC_REAL_NONE(0x1400, 0x100) EXC_VIRT_NONE(0x5400, 0x100) EXC_REAL_BEGIN(denorm_exception_hv, 0x1500, 0x100) 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_PR(0x1500) EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV) EXC_REAL_END(denorm_exception_hv, 0x1500, 0x100) #ifdef CONFIG_PPC_DENORMALISATION EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100) b exc_real_0x1500_denorm_exception_hv EXC_VIRT_END(denorm_exception, 0x5500, 0x100) #else EXC_VIRT_NONE(0x5500, 0x100) #endif TRAMP_KVM_SKIP(PACA_EXGEN, 0x1500) #ifdef CONFIG_PPC_DENORMALISATION TRAMP_REAL_BEGIN(denorm_assist) BEGIN_FTR_SECTION /* * To denormalise we need to move a copy of the register to itself. * For POWER6 do that here for all FP regs. */ mfmsr r10 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1) xori r10,r10,(MSR_FE0|MSR_FE1) mtmsrd r10 sync #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1 #define FMR4(n) FMR2(n) ; FMR2(n+2) #define FMR8(n) FMR4(n) ; FMR4(n+4) #define FMR16(n) FMR8(n) ; FMR8(n+8) #define FMR32(n) FMR16(n) ; FMR16(n+16) FMR32(0) FTR_SECTION_ELSE /* * To denormalise we need to move a copy of the register to itself. * For POWER7 do that here for the first 32 VSX registers only. */ mfmsr r10 oris r10,r10,MSR_VSX@h mtmsrd r10 sync #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1) #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2) #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4) #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8) #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16) XVCPSGNDP32(0) ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) BEGIN_FTR_SECTION b denorm_done END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) /* * To denormalise we need to move a copy of the register to itself. * For POWER8 we need to do that for all 64 VSX registers */ XVCPSGNDP32(32) denorm_done: mtspr SPRN_HSRR0,r11 mtcrf 0x80,r9 ld r9,PACA_EXGEN+EX_R9(r13) RESTORE_PPR_PACA(PACA_EXGEN, r10) BEGIN_FTR_SECTION ld r10,PACA_EXGEN+EX_CFAR(r13) mtspr SPRN_CFAR,r10 END_FTR_SECTION_IFSET(CPU_FTR_CFAR) ld r10,PACA_EXGEN+EX_R10(r13) ld r11,PACA_EXGEN+EX_R11(r13) ld r12,PACA_EXGEN+EX_R12(r13) ld r13,PACA_EXGEN+EX_R13(r13) HRFI_TO_UNKNOWN b . #endif EXC_COMMON_HV(denorm_common, 0x1500, unknown_exception) #ifdef CONFIG_CBE_RAS EXC_REAL_HV(cbe_maintenance, 0x1600, 0x100) EXC_VIRT_NONE(0x5600, 0x100) TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1600) EXC_COMMON(cbe_maintenance_common, 0x1600, cbe_maintenance_exception) #else /* CONFIG_CBE_RAS */ EXC_REAL_NONE(0x1600, 0x100) EXC_VIRT_NONE(0x5600, 0x100) #endif EXC_REAL(altivec_assist, 0x1700, 0x100) EXC_VIRT(altivec_assist, 0x5700, 0x100, 0x1700) TRAMP_KVM(PACA_EXGEN, 0x1700) #ifdef CONFIG_ALTIVEC EXC_COMMON(altivec_assist_common, 0x1700, altivec_assist_exception) #else EXC_COMMON(altivec_assist_common, 0x1700, unknown_exception) #endif #ifdef CONFIG_CBE_RAS EXC_REAL_HV(cbe_thermal, 0x1800, 0x100) EXC_VIRT_NONE(0x5800, 0x100) TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1800) EXC_COMMON(cbe_thermal_common, 0x1800, cbe_thermal_exception) #else /* CONFIG_CBE_RAS */ EXC_REAL_NONE(0x1800, 0x100) EXC_VIRT_NONE(0x5800, 0x100) #endif #ifdef CONFIG_PPC_WATCHDOG #define MASKED_DEC_HANDLER_LABEL 3f #define MASKED_DEC_HANDLER(_H) \ 3: /* soft-nmi */ \ std r12,PACA_EXGEN+EX_R12(r13); \ GET_SCRATCH0(r10); \ std r10,PACA_EXGEN+EX_R13(r13); \ EXCEPTION_PROLOG_PSERIES_1(soft_nmi_common, _H) /* * Branch to soft_nmi_interrupt using the emergency stack. The emergency * stack is one that is usable by maskable interrupts so long as MSR_EE * remains off. It is used for recovery when something has corrupted the * normal kernel stack, for example. The "soft NMI" must not use the process * stack because we want irq disabled sections to avoid touching the stack * at all (other than PMU interrupts), so use the emergency stack for this, * and run it entirely with interrupts hard disabled. */ EXC_COMMON_BEGIN(soft_nmi_common) mr r10,r1 ld r1,PACAEMERGSP(r13) subi r1,r1,INT_FRAME_SIZE EXCEPTION_COMMON_NORET_STACK(PACA_EXGEN, 0x900, system_reset, soft_nmi_interrupt, ADD_NVGPRS;ADD_RECONCILE) b ret_from_except #else /* CONFIG_PPC_WATCHDOG */ #define MASKED_DEC_HANDLER_LABEL 2f /* normal return */ #define MASKED_DEC_HANDLER(_H) #endif /* CONFIG_PPC_WATCHDOG */ /* * 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 MASKED_DEC_HANDLER_LABEL; \ 1: andi. r10,r10,(PACA_IRQ_DBELL|PACA_IRQ_HMI); \ bne 2f; \ mfspr r10,SPRN_##_H##SRR1; \ xori r10,r10,MSR_EE; /* clear MSR_EE */ \ 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); \ /* returns to kernel where r13 must be set up, so don't restore it */ \ ##_H##RFI_TO_KERNEL; \ b .; \ MASKED_DEC_HANDLER(_H) TRAMP_REAL_BEGIN(rfi_flush_fallback) SET_SCRATCH0(r13); GET_PACA(r13); std r9,PACA_EXRFI+EX_R9(r13) std r10,PACA_EXRFI+EX_R10(r13) std r11,PACA_EXRFI+EX_R11(r13) std r12,PACA_EXRFI+EX_R12(r13) std r8,PACA_EXRFI+EX_R13(r13) mfctr r9 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) ld r11,PACA_L1D_FLUSH_SETS(r13) ld r12,PACA_L1D_FLUSH_CONGRUENCE(r13) /* * The load adresses are at staggered offsets within cachelines, * which suits some pipelines better (on others it should not * hurt). */ addi r12,r12,8 mtctr r11 DCBT_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ /* order ld/st prior to dcbt stop all streams with flushing */ sync 1: li r8,0 .rept 8 /* 8-way set associative */ ldx r11,r10,r8 add r8,r8,r12 xor r11,r11,r11 // Ensure r11 is 0 even if fallback area is not add r8,r8,r11 // Add 0, this creates a dependency on the ldx .endr addi r10,r10,128 /* 128 byte cache line */ bdnz 1b mtctr r9 ld r9,PACA_EXRFI+EX_R9(r13) ld r10,PACA_EXRFI+EX_R10(r13) ld r11,PACA_EXRFI+EX_R11(r13) ld r12,PACA_EXRFI+EX_R12(r13) ld r8,PACA_EXRFI+EX_R13(r13) GET_SCRATCH0(r13); rfid TRAMP_REAL_BEGIN(hrfi_flush_fallback) SET_SCRATCH0(r13); GET_PACA(r13); std r9,PACA_EXRFI+EX_R9(r13) std r10,PACA_EXRFI+EX_R10(r13) std r11,PACA_EXRFI+EX_R11(r13) std r12,PACA_EXRFI+EX_R12(r13) std r8,PACA_EXRFI+EX_R13(r13) mfctr r9 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) ld r11,PACA_L1D_FLUSH_SETS(r13) ld r12,PACA_L1D_FLUSH_CONGRUENCE(r13) /* * The load adresses are at staggered offsets within cachelines, * which suits some pipelines better (on others it should not * hurt). */ addi r12,r12,8 mtctr r11 DCBT_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ /* order ld/st prior to dcbt stop all streams with flushing */ sync 1: li r8,0 .rept 8 /* 8-way set associative */ ldx r11,r10,r8 add r8,r8,r12 xor r11,r11,r11 // Ensure r11 is 0 even if fallback area is not add r8,r8,r11 // Add 0, this creates a dependency on the ldx .endr addi r10,r10,128 /* 128 byte cache line */ bdnz 1b mtctr r9 ld r9,PACA_EXRFI+EX_R9(r13) ld r10,PACA_EXRFI+EX_R10(r13) ld r11,PACA_EXRFI+EX_R11(r13) ld r12,PACA_EXRFI+EX_R12(r13) ld r8,PACA_EXRFI+EX_R13(r13) GET_SCRATCH0(r13); hrfid /* * Real mode exceptions actually use this too, but alternate * instruction code patches (which end up in the common .text area) * cannot reach these if they are put there. */ USE_FIXED_SECTION(virt_trampolines) MASKED_INTERRUPT() MASKED_INTERRUPT(H) #ifdef CONFIG_KVM_BOOK3S_64_HANDLER TRAMP_REAL_BEGIN(kvmppc_skip_interrupt) /* * Here all GPRs are unchanged from when the interrupt happened * except for r13, which is saved in SPRG_SCRATCH0. */ mfspr r13, SPRN_SRR0 addi r13, r13, 4 mtspr SPRN_SRR0, r13 GET_SCRATCH0(r13) RFI_TO_KERNEL b . TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt) /* * Here all GPRs are unchanged from when the interrupt happened * except for r13, which is saved in SPRG_SCRATCH0. */ mfspr r13, SPRN_HSRR0 addi r13, r13, 4 mtspr SPRN_HSRR0, r13 GET_SCRATCH0(r13) HRFI_TO_KERNEL b . #endif /* * Ensure that any handlers that get invoked from the exception prologs * above are below the first 64KB (0x10000) of the kernel image because * the prologs assemble the addresses of these handlers using the * LOAD_HANDLER macro, which uses an ori instruction. */ /*** Common interrupt handlers ***/ /* * Relocation-on interrupts: A subset of the interrupts can be delivered * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering * it. Addresses are the same as the original interrupt addresses, but * offset by 0xc000000000004000. * It's impossible to receive interrupts below 0x300 via this mechanism. * KVM: None of these traps are from the guest ; anything that escalated * to HV=1 from HV=0 is delivered via real mode handlers. */ /* * This uses the standard macro, since the original 0x300 vector * only has extra guff for STAB-based processors -- which never * come here. */ EXC_COMMON_BEGIN(ppc64_runlatch_on_trampoline) b __ppc64_runlatch_on USE_FIXED_SECTION(virt_trampolines) /* * The __end_interrupts marker must be past the out-of-line (OOL) * handlers, so that they are copied to real address 0x100 when running * a relocatable kernel. This ensures they can be reached from the short * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch * directly, without using LOAD_HANDLER(). */ .align 7 .globl __end_interrupts __end_interrupts: DEFINE_FIXED_SYMBOL(__end_interrupts) #ifdef CONFIG_PPC_970_NAP EXC_COMMON_BEGIN(power4_fixup_nap) andc r9,r9,r10 std r9,TI_LOCAL_FLAGS(r11) ld r10,_LINK(r1) /* make idle task do the */ std r10,_NIP(r1) /* equivalent of a blr */ blr #endif CLOSE_FIXED_SECTION(real_vectors); CLOSE_FIXED_SECTION(real_trampolines); CLOSE_FIXED_SECTION(virt_vectors); CLOSE_FIXED_SECTION(virt_trampolines); USE_TEXT_SECTION() /* * Hash table stuff */ .balign IFETCH_ALIGN_BYTES do_hash_page: #ifdef CONFIG_PPC_BOOK3S_64 lis r0,(DSISR_BAD_FAULT_64S|DSISR_DABRMATCH)@h ori r0,r0,DSISR_BAD_FAULT_64S@l and. r0,r4,r0 /* weird error? */ bne- handle_page_fault /* if not, try to insert a HPTE */ 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 /* Reload DSISR into r4 for the DABR check below */ ld r4,_DSISR(r1) #endif /* CONFIG_PPC_BOOK3S_64 */ /* Here we have a page fault that hash_page can't handle. */ handle_page_fault: 11: andis. r0,r4,DSISR_DABRMATCH@h bne- handle_dabr_fault ld r4,_DAR(r1) ld r5,_DSISR(r1) addi r3,r1,STACK_FRAME_OVERHEAD bl do_page_fault cmpdi r3,0 beq+ 12f bl save_nvgprs mr r5,r3 addi r3,r1,STACK_FRAME_OVERHEAD lwz r4,_DAR(r1) bl bad_page_fault b ret_from_except /* We have a data breakpoint exception - handle it */ handle_dabr_fault: bl save_nvgprs ld r4,_DAR(r1) ld r5,_DSISR(r1) addi r3,r1,STACK_FRAME_OVERHEAD bl do_break 12: b ret_from_except_lite #ifdef CONFIG_PPC_BOOK3S_64 /* We have a page fault that hash_page could handle but HV refused * the PTE insertion */ 13: bl save_nvgprs mr r5,r3 addi r3,r1,STACK_FRAME_OVERHEAD ld r4,_DAR(r1) bl low_hash_fault b ret_from_except #endif /* * We come here as a result of a DSI at a point where we don't want * to call hash_page, such as when we are accessing memory (possibly * user memory) inside a PMU interrupt that occurred while interrupts * were soft-disabled. We want to invoke the exception handler for * the access, or panic if there isn't a handler. */ 77: bl save_nvgprs mr r4,r3 addi r3,r1,STACK_FRAME_OVERHEAD li r5,SIGSEGV bl bad_page_fault b ret_from_except /* * Here we have detected that the kernel stack pointer is bad. * R9 contains the saved CR, r13 points to the paca, * r10 contains the (bad) kernel stack pointer, * r11 and r12 contain the saved SRR0 and SRR1. * We switch to using an emergency stack, save the registers there, * and call kernel_bad_stack(), which panics. */ bad_stack: ld r1,PACAEMERGSP(r13) subi r1,r1,64+INT_FRAME_SIZE std r9,_CCR(r1) std r10,GPR1(r1) std r11,_NIP(r1) std r12,_MSR(r1) mfspr r11,SPRN_DAR mfspr r12,SPRN_DSISR std r11,_DAR(r1) std r12,_DSISR(r1) mflr r10 mfctr r11 mfxer r12 std r10,_LINK(r1) std r11,_CTR(r1) std r12,_XER(r1) SAVE_GPR(0,r1) SAVE_GPR(2,r1) ld r10,EX_R3(r3) std r10,GPR3(r1) SAVE_GPR(4,r1) SAVE_4GPRS(5,r1) ld r9,EX_R9(r3) ld r10,EX_R10(r3) SAVE_2GPRS(9,r1) ld r9,EX_R11(r3) ld r10,EX_R12(r3) ld r11,EX_R13(r3) std r9,GPR11(r1) std r10,GPR12(r1) std r11,GPR13(r1) BEGIN_FTR_SECTION ld r10,EX_CFAR(r3) std r10,ORIG_GPR3(r1) END_FTR_SECTION_IFSET(CPU_FTR_CFAR) SAVE_8GPRS(14,r1) SAVE_10GPRS(22,r1) lhz r12,PACA_TRAP_SAVE(r13) std r12,_TRAP(r1) addi r11,r1,INT_FRAME_SIZE std r11,0(r1) li r12,0 std r12,0(r11) ld r2,PACATOC(r13) ld r11,exception_marker@toc(r2) std r12,RESULT(r1) std r11,STACK_FRAME_OVERHEAD-16(r1) 1: addi r3,r1,STACK_FRAME_OVERHEAD bl kernel_bad_stack b 1b _ASM_NOKPROBE_SYMBOL(bad_stack); /* * When doorbell is triggered from system reset wakeup, the message is * not cleared, so it would fire again when EE is enabled. * * When coming from local_irq_enable, there may be the same problem if * we were hard disabled. * * Execute msgclr to clear pending exceptions before handling it. */ h_doorbell_common_msgclr: LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36)) PPC_MSGCLR(3) b h_doorbell_common doorbell_super_common_msgclr: LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36)) PPC_MSGCLRP(3) b doorbell_super_common /* * 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. * * Note that we don't specify LR as the NIP (return address) for * the interrupt because that would unbalance the return branch * predictor. */ _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 LOAD_REG_ADDR(r11, replay_interrupt_return) mfcr r9 ori r12,r12,MSR_EE cmpwi r3,0x900 beq decrementer_common cmpwi r3,0x500 BEGIN_FTR_SECTION beq h_virt_irq_common FTR_SECTION_ELSE beq hardware_interrupt_common ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_300) BEGIN_FTR_SECTION cmpwi r3,0xa00 beq h_doorbell_common_msgclr cmpwi r3,0xe60 beq hmi_exception_common FTR_SECTION_ELSE cmpwi r3,0xa00 beq doorbell_super_common_msgclr ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) replay_interrupt_return: blr _ASM_NOKPROBE_SYMBOL(__replay_interrupt)