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Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 3322 |
1 files changed, 3322 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S new file mode 100644 index 000000000..10df278dc --- /dev/null +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -0,0 +1,3322 @@ +/* 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 <asm/hw_irq.h> +#include <asm/exception-64s.h> +#include <asm/ptrace.h> +#include <asm/cpuidle.h> +#include <asm/head-64.h> +#include <asm/feature-fixups.h> +#include <asm/kup.h> + +/* PACA save area offsets (exgen, exmc, etc) */ +#define EX_R9 0 +#define EX_R10 8 +#define EX_R11 16 +#define EX_R12 24 +#define EX_R13 32 +#define EX_DAR 40 +#define EX_DSISR 48 +#define EX_CCR 52 +#define EX_CFAR 56 +#define EX_PPR 64 +#define EX_CTR 72 +.if EX_SIZE != 10 + .error "EX_SIZE is wrong" +.endif + +/* + * Following are fixed section helper macros. + * + * EXC_REAL_BEGIN/END - real, unrelocated exception vectors + * EXC_VIRT_BEGIN/END - virt (AIL), unrelocated exception vectors + * TRAMP_REAL_BEGIN - real, unrelocated helpers (virt may call these) + * TRAMP_VIRT_BEGIN - virt, unreloc helpers (in practice, real can use) + * EXC_COMMON - After switching to virtual, relocated mode. + */ + +#define EXC_REAL_BEGIN(name, start, size) \ + FIXED_SECTION_ENTRY_BEGIN_LOCATION(real_vectors, exc_real_##start##_##name, start, size) + +#define EXC_REAL_END(name, start, size) \ + FIXED_SECTION_ENTRY_END_LOCATION(real_vectors, exc_real_##start##_##name, start, size) + +#define EXC_VIRT_BEGIN(name, start, size) \ + FIXED_SECTION_ENTRY_BEGIN_LOCATION(virt_vectors, exc_virt_##start##_##name, start, size) + +#define EXC_VIRT_END(name, start, size) \ + FIXED_SECTION_ENTRY_END_LOCATION(virt_vectors, exc_virt_##start##_##name, start, size) + +#define EXC_COMMON_BEGIN(name) \ + USE_TEXT_SECTION(); \ + .balign IFETCH_ALIGN_BYTES; \ + .global name; \ + _ASM_NOKPROBE_SYMBOL(name); \ + DEFINE_FIXED_SYMBOL(name); \ +name: + +#define TRAMP_REAL_BEGIN(name) \ + FIXED_SECTION_ENTRY_BEGIN(real_trampolines, name) + +#define TRAMP_VIRT_BEGIN(name) \ + FIXED_SECTION_ENTRY_BEGIN(virt_trampolines, name) + +#define EXC_REAL_NONE(start, size) \ + FIXED_SECTION_ENTRY_BEGIN_LOCATION(real_vectors, exc_real_##start##_##unused, start, size); \ + FIXED_SECTION_ENTRY_END_LOCATION(real_vectors, exc_real_##start##_##unused, start, size) + +#define EXC_VIRT_NONE(start, size) \ + FIXED_SECTION_ENTRY_BEGIN_LOCATION(virt_vectors, exc_virt_##start##_##unused, start, size); \ + FIXED_SECTION_ENTRY_END_LOCATION(virt_vectors, exc_virt_##start##_##unused, start, size) + +/* + * We're short on space and time in the exception prolog, so we can't + * use the normal LOAD_REG_IMMEDIATE macro to load the address of label. + * Instead we get the base of the kernel from paca->kernelbase and or in the low + * part of label. This requires that the label be within 64KB of kernelbase, and + * that kernelbase be 64K aligned. + */ +#define LOAD_HANDLER(reg, label) \ + ld reg,PACAKBASE(r13); /* get high part of &label */ \ + ori reg,reg,FIXED_SYMBOL_ABS_ADDR(label) + +#define __LOAD_HANDLER(reg, label) \ + ld reg,PACAKBASE(r13); \ + ori reg,reg,(ABS_ADDR(label))@l + +/* + * Branches from unrelocated code (e.g., interrupts) to labels outside + * head-y require >64K offsets. + */ +#define __LOAD_FAR_HANDLER(reg, label) \ + ld reg,PACAKBASE(r13); \ + ori reg,reg,(ABS_ADDR(label))@l; \ + addis reg,reg,(ABS_ADDR(label))@h + +/* + * Branch to label using its 0xC000 address. This results in instruction + * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned + * on using mtmsr rather than rfid. + * + * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than + * load KBASE for a slight optimisation. + */ +#define BRANCH_TO_C000(reg, label) \ + __LOAD_FAR_HANDLER(reg, label); \ + mtctr reg; \ + bctr + +/* + * Interrupt code generation macros + */ +#define IVEC .L_IVEC_\name\() /* Interrupt vector address */ +#define IHSRR .L_IHSRR_\name\() /* Sets SRR or HSRR registers */ +#define IHSRR_IF_HVMODE .L_IHSRR_IF_HVMODE_\name\() /* HSRR if HV else SRR */ +#define IAREA .L_IAREA_\name\() /* PACA save area */ +#define IVIRT .L_IVIRT_\name\() /* Has virt mode entry point */ +#define IISIDE .L_IISIDE_\name\() /* Uses SRR0/1 not DAR/DSISR */ +#define IDAR .L_IDAR_\name\() /* Uses DAR (or SRR0) */ +#define IDSISR .L_IDSISR_\name\() /* Uses DSISR (or SRR1) */ +#define ISET_RI .L_ISET_RI_\name\() /* Run common code w/ MSR[RI]=1 */ +#define IBRANCH_TO_COMMON .L_IBRANCH_TO_COMMON_\name\() /* ENTRY branch to common */ +#define IREALMODE_COMMON .L_IREALMODE_COMMON_\name\() /* Common runs in realmode */ +#define IMASK .L_IMASK_\name\() /* IRQ soft-mask bit */ +#define IKVM_SKIP .L_IKVM_SKIP_\name\() /* Generate KVM skip handler */ +#define IKVM_REAL .L_IKVM_REAL_\name\() /* Real entry tests KVM */ +#define __IKVM_REAL(name) .L_IKVM_REAL_ ## name +#define IKVM_VIRT .L_IKVM_VIRT_\name\() /* Virt entry tests KVM */ +#define ISTACK .L_ISTACK_\name\() /* Set regular kernel stack */ +#define __ISTACK(name) .L_ISTACK_ ## name +#define IRECONCILE .L_IRECONCILE_\name\() /* Do RECONCILE_IRQ_STATE */ +#define IKUAP .L_IKUAP_\name\() /* Do KUAP lock */ + +#define INT_DEFINE_BEGIN(n) \ +.macro int_define_ ## n name + +#define INT_DEFINE_END(n) \ +.endm ; \ +int_define_ ## n n ; \ +do_define_int n + +.macro do_define_int name + .ifndef IVEC + .error "IVEC not defined" + .endif + .ifndef IHSRR + IHSRR=0 + .endif + .ifndef IHSRR_IF_HVMODE + IHSRR_IF_HVMODE=0 + .endif + .ifndef IAREA + IAREA=PACA_EXGEN + .endif + .ifndef IVIRT + IVIRT=1 + .endif + .ifndef IISIDE + IISIDE=0 + .endif + .ifndef IDAR + IDAR=0 + .endif + .ifndef IDSISR + IDSISR=0 + .endif + .ifndef ISET_RI + ISET_RI=1 + .endif + .ifndef IBRANCH_TO_COMMON + IBRANCH_TO_COMMON=1 + .endif + .ifndef IREALMODE_COMMON + IREALMODE_COMMON=0 + .else + .if ! IBRANCH_TO_COMMON + .error "IREALMODE_COMMON=1 but IBRANCH_TO_COMMON=0" + .endif + .endif + .ifndef IMASK + IMASK=0 + .endif + .ifndef IKVM_SKIP + IKVM_SKIP=0 + .endif + .ifndef IKVM_REAL + IKVM_REAL=0 + .endif + .ifndef IKVM_VIRT + IKVM_VIRT=0 + .endif + .ifndef ISTACK + ISTACK=1 + .endif + .ifndef IRECONCILE + IRECONCILE=1 + .endif + .ifndef IKUAP + IKUAP=1 + .endif +.endm + +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE +/* + * All interrupts which set HSRR registers, as well as SRESET and MCE and + * syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken, + * so they all generally need to test whether they were taken in guest context. + * + * Note: SRESET and MCE may also be sent to the guest by the hypervisor, and be + * taken with MSR[HV]=0. + * + * Interrupts which set SRR registers (with the above exceptions) do not + * elevate to MSR[HV]=1 mode, though most can be taken when running with + * MSR[HV]=1 (e.g., bare metal kernel and userspace). So these interrupts do + * not need to test whether a guest is running because they get delivered to + * the guest directly, including nested HV KVM guests. + * + * The exception is PR KVM, where the guest runs with MSR[PR]=1 and the host + * runs with MSR[HV]=0, so the host takes all interrupts on behalf of the + * guest. PR KVM runs with LPCR[AIL]=0 which causes interrupts to always be + * delivered to the real-mode entry point, therefore such interrupts only test + * KVM in their real mode handlers, and only when PR KVM is possible. + * + * Interrupts that are taken in MSR[HV]=0 and escalate to MSR[HV]=1 are always + * delivered in real-mode when the MMU is in hash mode because the MMU + * registers are not set appropriately to translate host addresses. In nested + * radix mode these can be delivered in virt-mode as the host translations are + * used implicitly (see: effective LPID, effective PID). + */ + +/* + * If an interrupt is taken while a guest is running, it is immediately routed + * to KVM to handle. If both HV and PR KVM arepossible, KVM interrupts go first + * to kvmppc_interrupt_hv, which handles the PR guest case. + */ +#define kvmppc_interrupt kvmppc_interrupt_hv +#else +#define kvmppc_interrupt kvmppc_interrupt_pr +#endif + +.macro KVMTEST name + lbz r10,HSTATE_IN_GUEST(r13) + cmpwi r10,0 + bne \name\()_kvm +.endm + +.macro GEN_KVM name + .balign IFETCH_ALIGN_BYTES +\name\()_kvm: + + .if IKVM_SKIP + cmpwi r10,KVM_GUEST_MODE_SKIP + beq 89f + .else +BEGIN_FTR_SECTION + ld r10,IAREA+EX_CFAR(r13) + std r10,HSTATE_CFAR(r13) +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + .endif + + ld r10,IAREA+EX_CTR(r13) + mtctr r10 +BEGIN_FTR_SECTION + ld r10,IAREA+EX_PPR(r13) + std r10,HSTATE_PPR(r13) +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + ld r11,IAREA+EX_R11(r13) + ld r12,IAREA+EX_R12(r13) + std r12,HSTATE_SCRATCH0(r13) + sldi r12,r9,32 + ld r9,IAREA+EX_R9(r13) + ld r10,IAREA+EX_R10(r13) + /* HSRR variants have the 0x2 bit added to their trap number */ + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + ori r12,r12,(IVEC + 0x2) + FTR_SECTION_ELSE + ori r12,r12,(IVEC) + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .elseif IHSRR + ori r12,r12,(IVEC+ 0x2) + .else + ori r12,r12,(IVEC) + .endif + b kvmppc_interrupt + + .if IKVM_SKIP +89: mtocrf 0x80,r9 + ld r10,IAREA+EX_CTR(r13) + mtctr r10 + ld r9,IAREA+EX_R9(r13) + ld r10,IAREA+EX_R10(r13) + ld r11,IAREA+EX_R11(r13) + ld r12,IAREA+EX_R12(r13) + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + b kvmppc_skip_Hinterrupt + FTR_SECTION_ELSE + b kvmppc_skip_interrupt + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .elseif IHSRR + b kvmppc_skip_Hinterrupt + .else + b kvmppc_skip_interrupt + .endif + .endif +.endm + +#else +.macro KVMTEST name +.endm +.macro GEN_KVM name +.endm +#endif + +/* + * This is the BOOK3S interrupt entry code macro. + * + * This can result in one of several things happening: + * - Branch to the _common handler, relocated, in virtual mode. + * These are normal interrupts (synchronous and asynchronous) handled by + * the kernel. + * - Branch to KVM, relocated but real mode interrupts remain in real mode. + * These occur when HSTATE_IN_GUEST is set. The interrupt may be caused by + * / intended for host or guest kernel, but KVM must always be involved + * because the machine state is set for guest execution. + * - Branch to the masked handler, unrelocated. + * These occur when maskable asynchronous interrupts are taken with the + * irq_soft_mask set. + * - Branch to an "early" handler in real mode but relocated. + * This is done if early=1. MCE and HMI use these to handle errors in real + * mode. + * - Fall through and continue executing in real, unrelocated mode. + * This is done if early=2. + */ + +.macro GEN_BRANCH_TO_COMMON name, virt + .if IREALMODE_COMMON + LOAD_HANDLER(r10, \name\()_common) + mtctr r10 + bctr + .else + .if \virt +#ifndef CONFIG_RELOCATABLE + b \name\()_common_virt +#else + LOAD_HANDLER(r10, \name\()_common_virt) + mtctr r10 + bctr +#endif + .else + LOAD_HANDLER(r10, \name\()_common_real) + mtctr r10 + bctr + .endif + .endif +.endm + +.macro GEN_INT_ENTRY name, virt, ool=0 + SET_SCRATCH0(r13) /* save r13 */ + GET_PACA(r13) + std r9,IAREA+EX_R9(r13) /* save r9 */ +BEGIN_FTR_SECTION + mfspr r9,SPRN_PPR +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + HMT_MEDIUM + std r10,IAREA+EX_R10(r13) /* save r10 - r12 */ +BEGIN_FTR_SECTION + mfspr r10,SPRN_CFAR +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + .if \ool + .if !\virt + b tramp_real_\name + .pushsection .text + TRAMP_REAL_BEGIN(tramp_real_\name) + .else + b tramp_virt_\name + .pushsection .text + TRAMP_VIRT_BEGIN(tramp_virt_\name) + .endif + .endif + +BEGIN_FTR_SECTION + std r9,IAREA+EX_PPR(r13) +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) +BEGIN_FTR_SECTION + std r10,IAREA+EX_CFAR(r13) +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + INTERRUPT_TO_KERNEL + mfctr r10 + std r10,IAREA+EX_CTR(r13) + mfcr r9 + std r11,IAREA+EX_R11(r13) + std r12,IAREA+EX_R12(r13) + + /* + * DAR/DSISR, SCRATCH0 must be read before setting MSR[RI], + * because a d-side MCE will clobber those registers so is + * not recoverable if they are live. + */ + GET_SCRATCH0(r10) + std r10,IAREA+EX_R13(r13) + .if IDAR && !IISIDE + .if IHSRR + mfspr r10,SPRN_HDAR + .else + mfspr r10,SPRN_DAR + .endif + std r10,IAREA+EX_DAR(r13) + .endif + .if IDSISR && !IISIDE + .if IHSRR + mfspr r10,SPRN_HDSISR + .else + mfspr r10,SPRN_DSISR + .endif + stw r10,IAREA+EX_DSISR(r13) + .endif + + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + mfspr r11,SPRN_HSRR0 /* save HSRR0 */ + mfspr r12,SPRN_HSRR1 /* and HSRR1 */ + FTR_SECTION_ELSE + mfspr r11,SPRN_SRR0 /* save SRR0 */ + mfspr r12,SPRN_SRR1 /* and SRR1 */ + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .elseif IHSRR + mfspr r11,SPRN_HSRR0 /* save HSRR0 */ + mfspr r12,SPRN_HSRR1 /* and HSRR1 */ + .else + mfspr r11,SPRN_SRR0 /* save SRR0 */ + mfspr r12,SPRN_SRR1 /* and SRR1 */ + .endif + + .if IBRANCH_TO_COMMON + GEN_BRANCH_TO_COMMON \name \virt + .endif + + .if \ool + .popsection + .endif +.endm + +/* + * __GEN_COMMON_ENTRY is required to receive the branch from interrupt + * entry, except in the case of the real-mode handlers which require + * __GEN_REALMODE_COMMON_ENTRY. + * + * This switches to virtual mode and sets MSR[RI]. + */ +.macro __GEN_COMMON_ENTRY name +DEFINE_FIXED_SYMBOL(\name\()_common_real) +\name\()_common_real: + .if IKVM_REAL + KVMTEST \name + .endif + + ld r10,PACAKMSR(r13) /* get MSR value for kernel */ + /* MSR[RI] is clear iff using SRR regs */ + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + xori r10,r10,MSR_RI + END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) + .elseif ! IHSRR + xori r10,r10,MSR_RI + .endif + mtmsrd r10 + + .if IVIRT + .if IKVM_VIRT + b 1f /* skip the virt test coming from real */ + .endif + + .balign IFETCH_ALIGN_BYTES +DEFINE_FIXED_SYMBOL(\name\()_common_virt) +\name\()_common_virt: + .if IKVM_VIRT + KVMTEST \name +1: + .endif + .endif /* IVIRT */ +.endm + +/* + * Don't switch to virt mode. Used for early MCE and HMI handlers that + * want to run in real mode. + */ +.macro __GEN_REALMODE_COMMON_ENTRY name +DEFINE_FIXED_SYMBOL(\name\()_common_real) +\name\()_common_real: + .if IKVM_REAL + KVMTEST \name + .endif +.endm + +.macro __GEN_COMMON_BODY name + .if IMASK + .if ! ISTACK + .error "No support for masked interrupt to use custom stack" + .endif + + /* If coming from user, skip soft-mask tests. */ + andi. r10,r12,MSR_PR + bne 2f + + /* Kernel code running below __end_interrupts is implicitly + * soft-masked */ + LOAD_HANDLER(r10, __end_interrupts) + cmpld r11,r10 + li r10,IMASK + blt- 1f + + /* Test the soft mask state against our interrupt's bit */ + lbz r10,PACAIRQSOFTMASK(r13) +1: andi. r10,r10,IMASK + /* Associate vector numbers with bits in paca->irq_happened */ + .if IVEC == 0x500 || IVEC == 0xea0 + li r10,PACA_IRQ_EE + .elseif IVEC == 0x900 + li r10,PACA_IRQ_DEC + .elseif IVEC == 0xa00 || IVEC == 0xe80 + li r10,PACA_IRQ_DBELL + .elseif IVEC == 0xe60 + li r10,PACA_IRQ_HMI + .elseif IVEC == 0xf00 + li r10,PACA_IRQ_PMI + .else + .abort "Bad maskable vector" + .endif + + .if IHSRR_IF_HVMODE + BEGIN_FTR_SECTION + bne masked_Hinterrupt + FTR_SECTION_ELSE + bne masked_interrupt + ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) + .elseif IHSRR + bne masked_Hinterrupt + .else + bne masked_interrupt + .endif + .endif + + .if ISTACK + andi. r10,r12,MSR_PR /* See if coming from user */ +2: mr r10,r1 /* Save r1 */ + subi r1,r1,INT_FRAME_SIZE /* alloc frame on kernel stack */ + beq- 100f + ld r1,PACAKSAVE(r13) /* kernel stack to use */ +100: tdgei r1,-INT_FRAME_SIZE /* trap if r1 is in userspace */ + EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,0 + .endif + + std r9,_CCR(r1) /* save CR in stackframe */ + std r11,_NIP(r1) /* save SRR0 in stackframe */ + std r12,_MSR(r1) /* save SRR1 in stackframe */ + std r10,0(r1) /* make stack chain pointer */ + std r0,GPR0(r1) /* save r0 in stackframe */ + std r10,GPR1(r1) /* save r1 in stackframe */ + + .if ISET_RI + li r10,MSR_RI + mtmsrd r10,1 /* Set MSR_RI */ + .endif + + .if ISTACK + .if IKUAP + kuap_save_amr_and_lock r9, r10, cr1, cr0 + .endif + beq 101f /* if from kernel mode */ + ACCOUNT_CPU_USER_ENTRY(r13, r9, r10) +BEGIN_FTR_SECTION + ld r9,IAREA+EX_PPR(r13) /* Read PPR from paca */ + std r9,_PPR(r1) +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) +101: + .else + .if IKUAP + kuap_save_amr_and_lock r9, r10, cr1 + .endif + .endif + + /* Save original regs values from save area to stack frame. */ + ld r9,IAREA+EX_R9(r13) /* move r9, r10 to stackframe */ + ld r10,IAREA+EX_R10(r13) + std r9,GPR9(r1) + std r10,GPR10(r1) + ld r9,IAREA+EX_R11(r13) /* move r11 - r13 to stackframe */ + ld r10,IAREA+EX_R12(r13) + ld r11,IAREA+EX_R13(r13) + std r9,GPR11(r1) + std r10,GPR12(r1) + std r11,GPR13(r1) + + SAVE_NVGPRS(r1) + + .if IDAR + .if IISIDE + ld r10,_NIP(r1) + .else + ld r10,IAREA+EX_DAR(r13) + .endif + std r10,_DAR(r1) + .endif + + .if IDSISR + .if IISIDE + ld r10,_MSR(r1) + lis r11,DSISR_SRR1_MATCH_64S@h + and r10,r10,r11 + .else + lwz r10,IAREA+EX_DSISR(r13) + .endif + std r10,_DSISR(r1) + .endif + +BEGIN_FTR_SECTION + ld r10,IAREA+EX_CFAR(r13) + std r10,ORIG_GPR3(r1) +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + ld r10,IAREA+EX_CTR(r13) + std r10,_CTR(r1) + std r2,GPR2(r1) /* save r2 in stackframe */ + SAVE_4GPRS(3, r1) /* save r3 - r6 in stackframe */ + SAVE_2GPRS(7, r1) /* save r7, r8 in stackframe */ + mflr r9 /* Get LR, later save to stack */ + ld r2,PACATOC(r13) /* get kernel TOC into r2 */ + std r9,_LINK(r1) + lbz r10,PACAIRQSOFTMASK(r13) + mfspr r11,SPRN_XER /* save XER in stackframe */ + std r10,SOFTE(r1) + std r11,_XER(r1) + li r9,IVEC + std r9,_TRAP(r1) /* set trap number */ + li r10,0 + ld r11,exception_marker@toc(r2) + std r10,RESULT(r1) /* clear regs->result */ + std r11,STACK_FRAME_OVERHEAD-16(r1) /* mark the frame */ + + .if ISTACK + ACCOUNT_STOLEN_TIME + .endif + + .if IRECONCILE + RECONCILE_IRQ_STATE(r10, r11) + .endif +.endm + +/* + * On entry r13 points to the paca, r9-r13 are saved in the paca, + * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and + * SRR1, and relocation is on. + * + * If stack=0, then the stack is already set in r1, and r1 is saved in r10. + * PPR save and CPU accounting is not done for the !stack case (XXX why not?) + */ +.macro GEN_COMMON name + __GEN_COMMON_ENTRY \name + __GEN_COMMON_BODY \name +.endm + +/* + * Restore all registers including H/SRR0/1 saved in a stack frame of a + * standard exception. + */ +.macro EXCEPTION_RESTORE_REGS hsrr=0 + /* Move original SRR0 and SRR1 into the respective regs */ + ld r9,_MSR(r1) + .if \hsrr + mtspr SPRN_HSRR1,r9 + .else + mtspr SPRN_SRR1,r9 + .endif + ld r9,_NIP(r1) + .if \hsrr + mtspr SPRN_HSRR0,r9 + .else + mtspr SPRN_SRR0,r9 + .endif + ld r9,_CTR(r1) + mtctr r9 + ld r9,_XER(r1) + mtxer r9 + ld r9,_LINK(r1) + mtlr r9 + ld r9,_CCR(r1) + mtcr r9 + REST_8GPRS(2, r1) + REST_4GPRS(10, r1) + REST_GPR(0, r1) + /* restore original r1. */ + ld r1,GPR1(r1) +.endm + +#define RUNLATCH_ON \ +BEGIN_FTR_SECTION \ + ld r3, PACA_THREAD_INFO(r13); \ + ld r4,TI_LOCAL_FLAGS(r3); \ + andi. r0,r4,_TLF_RUNLATCH; \ + beql ppc64_runlatch_on_trampoline; \ +END_FTR_SECTION_IFSET(CPU_FTR_CTRL) + +/* + * When the idle code in power4_idle puts the CPU into NAP mode, + * it has to do so in a loop, and relies on the external interrupt + * and decrementer interrupt entry code to get it out of the loop. + * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags + * to signal that it is in the loop and needs help to get out. + */ +#ifdef CONFIG_PPC_970_NAP +#define FINISH_NAP \ +BEGIN_FTR_SECTION \ + ld r11, PACA_THREAD_INFO(r13); \ + ld r9,TI_LOCAL_FLAGS(r11); \ + andi. r10,r9,_TLF_NAPPING; \ + bnel power4_fixup_nap; \ +END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) +#else +#define FINISH_NAP +#endif + +/* + * 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. + * + * The scv instructions are a special case. They get a 0x3000 offset applied. + * scv exceptions have unique reentrancy properties, see below. + * + * 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 - 0x2fff : Real mode trampolines + * 0x3000 - 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, 0x3000) +OPEN_FIXED_SECTION(virt_vectors, 0x3000, 0x5900) +OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000) + +#ifdef CONFIG_PPC_POWERNV + .globl start_real_trampolines + .globl end_real_trampolines + .globl start_virt_trampolines + .globl end_virt_trampolines +#endif + +#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: + +/** + * Interrupt 0x3000 - System Call Vectored Interrupt (syscall). + * This is a synchronous interrupt invoked with the "scv" instruction. The + * system call does not alter the HV bit, so it is directed to the OS. + * + * Handling: + * scv instructions enter the kernel without changing EE, RI, ME, or HV. + * In particular, this means we can take a maskable interrupt at any point + * in the scv handler, which is unlike any other interrupt. This is solved + * by treating the instruction addresses below __end_interrupts as being + * soft-masked. + * + * AIL-0 mode scv exceptions go to 0x17000-0x17fff, but we set AIL-3 and + * ensure scv is never executed with relocation off, which means AIL-0 + * should never happen. + * + * Before leaving the below __end_interrupts text, at least of the following + * must be true: + * - MSR[PR]=1 (i.e., return to userspace) + * - MSR_EE|MSR_RI is set (no reentrant exceptions) + * - Standard kernel environment is set up (stack, paca, etc) + * + * Call convention: + * + * syscall register convention is in Documentation/powerpc/syscall64-abi.rst + */ +EXC_VIRT_BEGIN(system_call_vectored, 0x3000, 0x1000) + /* SCV 0 */ + mr r9,r13 + GET_PACA(r13) + mflr r11 + mfctr r12 + li r10,IRQS_ALL_DISABLED + stb r10,PACAIRQSOFTMASK(r13) +#ifdef CONFIG_RELOCATABLE + b system_call_vectored_tramp +#else + b system_call_vectored_common +#endif + nop + + /* SCV 1 - 127 */ + .rept 127 + mr r9,r13 + GET_PACA(r13) + mflr r11 + mfctr r12 + li r10,IRQS_ALL_DISABLED + stb r10,PACAIRQSOFTMASK(r13) + li r0,-1 /* cause failure */ +#ifdef CONFIG_RELOCATABLE + b system_call_vectored_sigill_tramp +#else + b system_call_vectored_sigill +#endif + .endr +EXC_VIRT_END(system_call_vectored, 0x3000, 0x1000) + +#ifdef CONFIG_RELOCATABLE +TRAMP_VIRT_BEGIN(system_call_vectored_tramp) + __LOAD_HANDLER(r10, system_call_vectored_common) + mtctr r10 + bctr + +TRAMP_VIRT_BEGIN(system_call_vectored_sigill_tramp) + __LOAD_HANDLER(r10, system_call_vectored_sigill) + mtctr r10 + bctr +#endif + + +/* No virt vectors corresponding with 0x0..0x100 */ +EXC_VIRT_NONE(0x4000, 0x100) + + +/** + * Interrupt 0x100 - System Reset Interrupt (SRESET aka NMI). + * This is a non-maskable, asynchronous interrupt always taken in real-mode. + * It is caused by: + * - Wake from power-saving state, on powernv. + * - An NMI from another CPU, triggered by firmware or hypercall. + * - As crash/debug signal injected from BMC, firmware or hypervisor. + * + * Handling: + * Power-save wakeup is the only performance critical path, so this is + * determined quickly as possible first. In this case volatile registers + * can be discarded and SPRs like CFAR don't need to be read. + * + * If not a powersave wakeup, then it's run as a regular interrupt, however + * it uses its own stack and PACA save area to preserve the regular kernel + * environment for debugging. + * + * This interrupt is not maskable, so triggering it when MSR[RI] is clear, + * or SCRATCH0 is in use, etc. may cause a crash. It's also not entirely + * correct to switch to virtual mode to run the regular interrupt handler + * because it might be interrupted when the MMU is in a bad state (e.g., SLB + * is clear). + * + * FWNMI: + * PAPR specifies a "fwnmi" facility which sends the sreset to a different + * entry point with a different register set up. Some hypervisors will + * send the sreset to 0x100 in the guest if it is not fwnmi capable. + * + * KVM: + * Unlike most SRR interrupts, this may be taken by the host while executing + * in a guest, so a KVM test is required. KVM will pull the CPU out of guest + * mode and then raise the sreset. + */ +INT_DEFINE_BEGIN(system_reset) + IVEC=0x100 + IAREA=PACA_EXNMI + IVIRT=0 /* no virt entry point */ + /* + * MSR_RI is not enabled, because PACA_EXNMI and nmi stack is + * being used, so a nested NMI exception would corrupt it. + */ + ISET_RI=0 + ISTACK=0 + IRECONCILE=0 + IKVM_REAL=1 +INT_DEFINE_END(system_reset) + +EXC_REAL_BEGIN(system_reset, 0x100, 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 mtmsrd later, after SPRs are restored. + * + * Careful to minimise cost for the fast path (idle wakeup) while + * also avoiding clobbering CFAR for the debug path (non-idle). + * + * For the idle wake case volatile registers can be clobbered, which + * is why we use those initially. If it turns out to not be an idle + * wake, carefully put everything back the way it was, so we can use + * common exception macros to handle it. + */ +BEGIN_FTR_SECTION + SET_SCRATCH0(r13) + GET_PACA(r13) + std r3,PACA_EXNMI+0*8(r13) + std r4,PACA_EXNMI+1*8(r13) + std r5,PACA_EXNMI+2*8(r13) + mfspr r3,SPRN_SRR1 + mfocrf r4,0x80 + rlwinm. r5,r3,47-31,30,31 + bne+ system_reset_idle_wake + /* Not powersave wakeup. Restore regs for regular interrupt handler. */ + mtocrf 0x80,r4 + ld r3,PACA_EXNMI+0*8(r13) + ld r4,PACA_EXNMI+1*8(r13) + ld r5,PACA_EXNMI+2*8(r13) + GET_SCRATCH0(r13) +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) +#endif + + GEN_INT_ENTRY system_reset, virt=0 + /* + * In theory, we should not enable relocation here if it was disabled + * in SRR1, because the MMU may not be configured to support it (e.g., + * SLB may have been cleared). In practice, there should only be a few + * small windows where that's the case, and sreset is considered to + * be dangerous anyway. + */ +EXC_REAL_END(system_reset, 0x100, 0x100) +EXC_VIRT_NONE(0x4100, 0x100) + +#ifdef CONFIG_PPC_P7_NAP +TRAMP_REAL_BEGIN(system_reset_idle_wake) + /* We are waking up from idle, so may clobber any volatile register */ + cmpwi cr1,r5,2 + bltlr cr1 /* no state loss, return to idle caller with r3=SRR1 */ + BRANCH_TO_C000(r12, DOTSYM(idle_return_gpr_loss)) +#endif + +#ifdef CONFIG_PPC_PSERIES +/* + * Vectors for the FWNMI option. Share common code. + */ +TRAMP_REAL_BEGIN(system_reset_fwnmi) + GEN_INT_ENTRY system_reset, virt=0 + +#endif /* CONFIG_PPC_PSERIES */ + +EXC_COMMON_BEGIN(system_reset_common) + __GEN_COMMON_ENTRY system_reset + /* + * 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 + __GEN_COMMON_BODY system_reset + /* + * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does + * the right thing. We do not want to reconcile because that goes + * through irq tracing which we don't want in NMI. + * + * Save PACAIRQHAPPENED to RESULT (otherwise unused), and set HARD_DIS + * as we are running with MSR[EE]=0. + */ + li r10,IRQS_ALL_DISABLED + stb r10,PACAIRQSOFTMASK(r13) + lbz r10,PACAIRQHAPPENED(r13) + std r10,RESULT(r1) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) + + addi r3,r1,STACK_FRAME_OVERHEAD + bl system_reset_exception + + /* Clear MSR_RI before setting SRR0 and SRR1. */ + li r9,0 + mtmsrd r9,1 + + /* + * MSR_RI is clear, now we can decrement paca->in_nmi. + */ + lhz r10,PACA_IN_NMI(r13) + subi r10,r10,1 + sth r10,PACA_IN_NMI(r13) + + /* + * Restore soft mask settings. + */ + ld r10,RESULT(r1) + stb r10,PACAIRQHAPPENED(r13) + ld r10,SOFTE(r1) + stb r10,PACAIRQSOFTMASK(r13) + + kuap_restore_amr r9, r10 + EXCEPTION_RESTORE_REGS + RFI_TO_USER_OR_KERNEL + + GEN_KVM system_reset + + +/** + * Interrupt 0x200 - Machine Check Interrupt (MCE). + * This is a non-maskable interrupt always taken in real-mode. It can be + * synchronous or asynchronous, caused by hardware or software, and it may be + * taken in a power-saving state. + * + * Handling: + * Similarly to system reset, this uses its own stack and PACA save area, + * the difference is re-entrancy is allowed on the machine check stack. + * + * machine_check_early is run in real mode, and carefully decodes the + * machine check and tries to handle it (e.g., flush the SLB if there was an + * error detected there), determines if it was recoverable and logs the + * event. + * + * This early code does not "reconcile" irq soft-mask state like SRESET or + * regular interrupts do, so irqs_disabled() among other things may not work + * properly (irq disable/enable already doesn't work because irq tracing can + * not work in real mode). + * + * Then, depending on the execution context when the interrupt is taken, there + * are 3 main actions: + * - Executing in kernel mode. The event is queued with irq_work, which means + * it is handled when it is next safe to do so (i.e., the kernel has enabled + * interrupts), which could be immediately when the interrupt returns. This + * avoids nasty issues like switching to virtual mode when the MMU is in a + * bad state, or when executing OPAL code. (SRESET is exposed to such issues, + * but it has different priorities). Check to see if the CPU was in power + * save, and return via the wake up code if it was. + * + * - Executing in user mode. machine_check_exception is run like a normal + * interrupt handler, which processes the data generated by the early handler. + * + * - Executing in guest mode. The interrupt is run with its KVM test, and + * branches to KVM to deal with. KVM may queue the event for the host + * to report later. + * + * This interrupt is not maskable, so if it triggers when MSR[RI] is clear, + * or SCRATCH0 is in use, it may cause a crash. + * + * KVM: + * See SRESET. + */ +INT_DEFINE_BEGIN(machine_check_early) + IVEC=0x200 + IAREA=PACA_EXMC + IVIRT=0 /* no virt entry point */ + IREALMODE_COMMON=1 + /* + * MSR_RI is not enabled, because PACA_EXMC is being used, so a + * nested machine check corrupts it. machine_check_common enables + * MSR_RI. + */ + ISET_RI=0 + ISTACK=0 + IDAR=1 + IDSISR=1 + IRECONCILE=0 + IKUAP=0 /* We don't touch AMR here, we never go to virtual mode */ +INT_DEFINE_END(machine_check_early) + +INT_DEFINE_BEGIN(machine_check) + IVEC=0x200 + IAREA=PACA_EXMC + IVIRT=0 /* no virt entry point */ + ISET_RI=0 + IDAR=1 + IDSISR=1 + IKVM_SKIP=1 + IKVM_REAL=1 +INT_DEFINE_END(machine_check) + +EXC_REAL_BEGIN(machine_check, 0x200, 0x100) + GEN_INT_ENTRY machine_check_early, virt=0 +EXC_REAL_END(machine_check, 0x200, 0x100) +EXC_VIRT_NONE(0x4200, 0x100) + +#ifdef CONFIG_PPC_PSERIES +TRAMP_REAL_BEGIN(machine_check_fwnmi) + /* See comment at machine_check exception, don't turn on RI */ + GEN_INT_ENTRY machine_check_early, virt=0 +#endif + +#define MACHINE_CHECK_HANDLER_WINDUP \ + /* Clear MSR_RI before setting SRR0 and SRR1. */\ + li r9,0; \ + mtmsrd r9,1; /* Clear MSR_RI */ \ + /* Decrement paca->in_mce now RI is clear. */ \ + lhz r12,PACA_IN_MCE(r13); \ + subi r12,r12,1; \ + sth r12,PACA_IN_MCE(r13); \ + EXCEPTION_RESTORE_REGS + +EXC_COMMON_BEGIN(machine_check_early_common) + __GEN_REALMODE_COMMON_ENTRY machine_check_early + + /* + * 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. + */ + lhz r10,PACA_IN_MCE(r13) + cmpwi r10,0 /* Are we in nested machine check */ + cmpwi cr1,r10,MAX_MCE_DEPTH /* Are we at maximum nesting */ + addi r10,r10,1 /* increment paca->in_mce */ + sth r10,PACA_IN_MCE(r13) + + mr r10,r1 /* Save r1 */ + bne 1f + /* First machine check entry */ + ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ +1: /* Limit nested MCE to level 4 to avoid stack overflow */ + bgt cr1,unrecoverable_mce /* Check if we hit limit of 4 */ + subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ + + __GEN_COMMON_BODY machine_check_early + +BEGIN_FTR_SECTION + bl enable_machine_check +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) + li r10,MSR_RI + mtmsrd r10,1 + + /* + * Set IRQS_ALL_DISABLED and save PACAIRQHAPPENED (see + * system_reset_common) + */ + li r10,IRQS_ALL_DISABLED + stb r10,PACAIRQSOFTMASK(r13) + lbz r10,PACAIRQHAPPENED(r13) + std r10,RESULT(r1) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) + + addi r3,r1,STACK_FRAME_OVERHEAD + bl machine_check_early + std r3,RESULT(r1) /* Save result */ + ld r12,_MSR(r1) + + /* + * Restore soft mask settings. + */ + ld r10,RESULT(r1) + stb r10,PACAIRQHAPPENED(r13) + ld r10,SOFTE(r1) + stb r10,PACAIRQSOFTMASK(r13) + +#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 + +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER + /* + * Check if we are coming from guest. If yes, then run the normal + * exception handler which will take the + * machine_check_kvm->kvmppc_interrupt branch to deliver the MC event + * to guest. + */ + lbz r11,HSTATE_IN_GUEST(r13) + cmpwi r11,0 /* Check if coming from guest */ + bne mce_deliver /* continue if we are. */ +#endif + + /* + * Check if we are coming from userspace. If yes, then run the normal + * exception handler which will deliver the MC event to this kernel. + */ + andi. r11,r12,MSR_PR /* See if coming from user. */ + bne mce_deliver /* continue in V mode if we are. */ + + /* + * At this point we are coming from kernel context. + * 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 + beq unrecoverable_mce + + /* + * 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 unrecoverable_mce /* 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_KERNEL + +mce_deliver: + /* + * This is a host user or guest MCE. Restore all registers, then + * run the "late" handler. For host user, this will run the + * machine_check_exception handler in virtual mode like a normal + * interrupt handler. For guest, this will trigger the KVM test + * and branch to the KVM interrupt similarly to other interrupts. + */ +BEGIN_FTR_SECTION + ld r10,ORIG_GPR3(r1) + mtspr SPRN_CFAR,r10 +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) + MACHINE_CHECK_HANDLER_WINDUP + GEN_INT_ENTRY machine_check, virt=0 + +EXC_COMMON_BEGIN(machine_check_common) + /* + * Machine check is different because we use a different + * save area: PACA_EXMC instead of PACA_EXGEN. + */ + GEN_COMMON machine_check + + FINISH_NAP + /* Enable MSR_RI when finished with PACA_EXMC */ + li r10,MSR_RI + mtmsrd r10,1 + addi r3,r1,STACK_FRAME_OVERHEAD + bl machine_check_exception + b interrupt_return + + GEN_KVM machine_check + + +#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 + + /* + * GPR-loss wakeups are relatively straightforward, because the + * idle sleep code has saved all non-volatile registers on its + * own stack, and r1 in PACAR1. + * + * For no-loss wakeups the r1 and lr registers used by the + * early machine check handler have to be restored first. r2 is + * the kernel TOC, so no need to restore it. + * + * Then decrement MCE nesting after finishing with the stack. + */ + ld r3,_MSR(r1) + ld r4,_LINK(r1) + ld r1,GPR1(r1) + + lhz r11,PACA_IN_MCE(r13) + subi r11,r11,1 + sth r11,PACA_IN_MCE(r13) + + mtlr r4 + rlwinm r10,r3,47-31,30,31 + cmpwi cr1,r10,2 + bltlr cr1 /* no state loss, return to idle caller with r3=SRR1 */ + b idle_return_gpr_loss +#endif + +EXC_COMMON_BEGIN(unrecoverable_mce) + /* + * 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. + */ +BEGIN_FTR_SECTION + li r10,0 /* clear MSR_RI */ + mtmsrd r10,1 + bl disable_machine_check +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) + ld r10,PACAKMSR(r13) + li r3,MSR_ME + andc r10,r10,r3 + mtmsrd r10 + + lhz r12,PACA_IN_MCE(r13) + subi r12,r12,1 + sth r12,PACA_IN_MCE(r13) + + /* 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. + */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl unrecoverable_exception + b . + + +/** + * Interrupt 0x300 - Data Storage Interrupt (DSI). + * This is a synchronous interrupt generated due to a data access exception, + * e.g., a load orstore which does not have a valid page table entry with + * permissions. DAWR matches also fault here, as do RC updates, and minor misc + * errors e.g., copy/paste, AMO, certain invalid CI accesses, etc. + * + * Handling: + * - Hash MMU + * Go to do_hash_page first to see if the HPT can be filled from an entry in + * the Linux page table. Hash faults can hit in kernel mode in a fairly + * arbitrary state (e.g., interrupts disabled, locks held) when accessing + * "non-bolted" regions, e.g., vmalloc space. However these should always be + * backed by Linux page tables. + * + * If none is found, do a Linux page fault. Linux page faults can happen in + * kernel mode due to user copy operations of course. + * + * KVM: The KVM HDSI handler may perform a load with MSR[DR]=1 in guest + * MMU context, which may cause a DSI in the host, which must go to the + * KVM handler. MSR[IR] is not enabled, so the real-mode handler will + * always be used regardless of AIL setting. + * + * - Radix MMU + * The hardware loads from the Linux page table directly, so a fault goes + * immediately to Linux page fault. + * + * Conditions like DAWR match are handled on the way in to Linux page fault. + */ +INT_DEFINE_BEGIN(data_access) + IVEC=0x300 + IDAR=1 + IDSISR=1 + IKVM_SKIP=1 + IKVM_REAL=1 +INT_DEFINE_END(data_access) + +EXC_REAL_BEGIN(data_access, 0x300, 0x80) + GEN_INT_ENTRY data_access, virt=0 +EXC_REAL_END(data_access, 0x300, 0x80) +EXC_VIRT_BEGIN(data_access, 0x4300, 0x80) + GEN_INT_ENTRY data_access, virt=1 +EXC_VIRT_END(data_access, 0x4300, 0x80) +EXC_COMMON_BEGIN(data_access_common) + GEN_COMMON data_access + ld r4,_DAR(r1) + ld r5,_DSISR(r1) +BEGIN_MMU_FTR_SECTION + ld r6,_MSR(r1) + li r3,0x300 + 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) + + GEN_KVM data_access + + +/** + * Interrupt 0x380 - Data Segment Interrupt (DSLB). + * This is a synchronous interrupt in response to an MMU fault missing SLB + * entry for HPT, or an address outside RPT translation range. + * + * Handling: + * - HPT: + * This refills the SLB, or reports an access fault similarly to a bad page + * fault. When coming from user-mode, the SLB handler may access any kernel + * data, though it may itself take a DSLB. When coming from kernel mode, + * recursive faults must be avoided so access is restricted to the kernel + * image text/data, kernel stack, and any data allocated below + * ppc64_bolted_size (first segment). The kernel handler must avoid stomping + * on user-handler data structures. + * + * KVM: Same as 0x300, DSLB must test for KVM guest. + * + * A dedicated save area EXSLB is used (XXX: but it actually need not be + * these days, we could use EXGEN). + */ +INT_DEFINE_BEGIN(data_access_slb) + IVEC=0x380 + IAREA=PACA_EXSLB + IRECONCILE=0 + IDAR=1 + IKVM_SKIP=1 + IKVM_REAL=1 +INT_DEFINE_END(data_access_slb) + +EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80) + GEN_INT_ENTRY data_access_slb, virt=0 +EXC_REAL_END(data_access_slb, 0x380, 0x80) +EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80) + GEN_INT_ENTRY data_access_slb, virt=1 +EXC_VIRT_END(data_access_slb, 0x4380, 0x80) +EXC_COMMON_BEGIN(data_access_slb_common) + GEN_COMMON data_access_slb + ld r4,_DAR(r1) + addi r3,r1,STACK_FRAME_OVERHEAD +BEGIN_MMU_FTR_SECTION + /* HPT case, do SLB fault */ + bl do_slb_fault + cmpdi r3,0 + bne- 1f + b fast_interrupt_return +1: /* Error case */ +MMU_FTR_SECTION_ELSE + /* Radix case, access is outside page table range */ + li r3,-EFAULT +ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) + std r3,RESULT(r1) + RECONCILE_IRQ_STATE(r10, r11) + ld r4,_DAR(r1) + ld r5,RESULT(r1) + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_bad_slb_fault + b interrupt_return + + GEN_KVM data_access_slb + + +/** + * Interrupt 0x400 - Instruction Storage Interrupt (ISI). + * This is a synchronous interrupt in response to an MMU fault due to an + * instruction fetch. + * + * Handling: + * Similar to DSI, though in response to fetch. The faulting address is found + * in SRR0 (rather than DAR), and status in SRR1 (rather than DSISR). + */ +INT_DEFINE_BEGIN(instruction_access) + IVEC=0x400 + IISIDE=1 + IDAR=1 + IDSISR=1 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(instruction_access) + +EXC_REAL_BEGIN(instruction_access, 0x400, 0x80) + GEN_INT_ENTRY instruction_access, virt=0 +EXC_REAL_END(instruction_access, 0x400, 0x80) +EXC_VIRT_BEGIN(instruction_access, 0x4400, 0x80) + GEN_INT_ENTRY instruction_access, virt=1 +EXC_VIRT_END(instruction_access, 0x4400, 0x80) +EXC_COMMON_BEGIN(instruction_access_common) + GEN_COMMON instruction_access + ld r4,_DAR(r1) + ld r5,_DSISR(r1) +BEGIN_MMU_FTR_SECTION + ld r6,_MSR(r1) + li r3,0x400 + 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) + + GEN_KVM instruction_access + + +/** + * Interrupt 0x480 - Instruction Segment Interrupt (ISLB). + * This is a synchronous interrupt in response to an MMU fault due to an + * instruction fetch. + * + * Handling: + * Similar to DSLB, though in response to fetch. The faulting address is found + * in SRR0 (rather than DAR). + */ +INT_DEFINE_BEGIN(instruction_access_slb) + IVEC=0x480 + IAREA=PACA_EXSLB + IRECONCILE=0 + IISIDE=1 + IDAR=1 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(instruction_access_slb) + +EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80) + GEN_INT_ENTRY instruction_access_slb, virt=0 +EXC_REAL_END(instruction_access_slb, 0x480, 0x80) +EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80) + GEN_INT_ENTRY instruction_access_slb, virt=1 +EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80) +EXC_COMMON_BEGIN(instruction_access_slb_common) + GEN_COMMON instruction_access_slb + ld r4,_DAR(r1) + addi r3,r1,STACK_FRAME_OVERHEAD +BEGIN_MMU_FTR_SECTION + /* HPT case, do SLB fault */ + bl do_slb_fault + cmpdi r3,0 + bne- 1f + b fast_interrupt_return +1: /* Error case */ +MMU_FTR_SECTION_ELSE + /* Radix case, access is outside page table range */ + li r3,-EFAULT +ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) + std r3,RESULT(r1) + RECONCILE_IRQ_STATE(r10, r11) + ld r4,_DAR(r1) + ld r5,RESULT(r1) + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_bad_slb_fault + b interrupt_return + + GEN_KVM instruction_access_slb + + +/** + * Interrupt 0x500 - External Interrupt. + * This is an asynchronous maskable interrupt in response to an "external + * exception" from the interrupt controller or hypervisor (e.g., device + * interrupt). It is maskable in hardware by clearing MSR[EE], and + * soft-maskable with IRQS_DISABLED mask (i.e., local_irq_disable()). + * + * When running in HV mode, Linux sets up the LPCR[LPES] bit such that + * interrupts are delivered with HSRR registers, guests use SRRs, which + * reqiures IHSRR_IF_HVMODE. + * + * On bare metal POWER9 and later, Linux sets the LPCR[HVICE] bit such that + * external interrupts are delivered as Hypervisor Virtualization Interrupts + * rather than External Interrupts. + * + * Handling: + * This calls into Linux IRQ handler. NVGPRs are not saved to reduce overhead, + * because registers at the time of the interrupt are not so important as it is + * asynchronous. + * + * If soft masked, the masked handler will note the pending interrupt for + * replay, and clear MSR[EE] in the interrupted context. + */ +INT_DEFINE_BEGIN(hardware_interrupt) + IVEC=0x500 + IHSRR_IF_HVMODE=1 + IMASK=IRQS_DISABLED + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(hardware_interrupt) + +EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100) + GEN_INT_ENTRY hardware_interrupt, virt=0 +EXC_REAL_END(hardware_interrupt, 0x500, 0x100) +EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100) + GEN_INT_ENTRY hardware_interrupt, virt=1 +EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100) +EXC_COMMON_BEGIN(hardware_interrupt_common) + GEN_COMMON hardware_interrupt + FINISH_NAP + RUNLATCH_ON + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_IRQ + b interrupt_return + + GEN_KVM hardware_interrupt + + +/** + * Interrupt 0x600 - Alignment Interrupt + * This is a synchronous interrupt in response to data alignment fault. + */ +INT_DEFINE_BEGIN(alignment) + IVEC=0x600 + IDAR=1 + IDSISR=1 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(alignment) + +EXC_REAL_BEGIN(alignment, 0x600, 0x100) + GEN_INT_ENTRY alignment, virt=0 +EXC_REAL_END(alignment, 0x600, 0x100) +EXC_VIRT_BEGIN(alignment, 0x4600, 0x100) + GEN_INT_ENTRY alignment, virt=1 +EXC_VIRT_END(alignment, 0x4600, 0x100) +EXC_COMMON_BEGIN(alignment_common) + GEN_COMMON alignment + addi r3,r1,STACK_FRAME_OVERHEAD + bl alignment_exception + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ + b interrupt_return + + GEN_KVM alignment + + +/** + * Interrupt 0x700 - Program Interrupt (program check). + * This is a synchronous interrupt in response to various instruction faults: + * traps, privilege errors, TM errors, floating point exceptions. + * + * Handling: + * This interrupt may use the "emergency stack" in some cases when being taken + * from kernel context, which complicates handling. + */ +INT_DEFINE_BEGIN(program_check) + IVEC=0x700 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(program_check) + +EXC_REAL_BEGIN(program_check, 0x700, 0x100) + GEN_INT_ENTRY program_check, virt=0 +EXC_REAL_END(program_check, 0x700, 0x100) +EXC_VIRT_BEGIN(program_check, 0x4700, 0x100) + GEN_INT_ENTRY program_check, virt=1 +EXC_VIRT_END(program_check, 0x4700, 0x100) +EXC_COMMON_BEGIN(program_check_common) + __GEN_COMMON_ENTRY program_check + + /* + * 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. + */ + + andi. r10,r12,MSR_PR + bne .Lnormal_stack /* If userspace, go normal path */ + + andis. r10,r12,(SRR1_PROGTM)@h + bne .Lemergency_stack /* If TM, emergency */ + + cmpdi r1,-INT_FRAME_SIZE /* check if r1 is in userspace */ + blt .Lnormal_stack /* normal path if not */ + + /* Use the emergency stack */ +.Lemergency_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 */ + __ISTACK(program_check)=0 + __GEN_COMMON_BODY program_check + b .Ldo_program_check + +.Lnormal_stack: + __ISTACK(program_check)=1 + __GEN_COMMON_BODY program_check + +.Ldo_program_check: + addi r3,r1,STACK_FRAME_OVERHEAD + bl program_check_exception + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ + b interrupt_return + + GEN_KVM program_check + + +/* + * Interrupt 0x800 - Floating-Point Unavailable Interrupt. + * This is a synchronous interrupt in response to executing an fp instruction + * with MSR[FP]=0. + * + * Handling: + * This will load FP registers and enable the FP bit if coming from userspace, + * otherwise report a bad kernel use of FP. + */ +INT_DEFINE_BEGIN(fp_unavailable) + IVEC=0x800 + IRECONCILE=0 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(fp_unavailable) + +EXC_REAL_BEGIN(fp_unavailable, 0x800, 0x100) + GEN_INT_ENTRY fp_unavailable, virt=0 +EXC_REAL_END(fp_unavailable, 0x800, 0x100) +EXC_VIRT_BEGIN(fp_unavailable, 0x4800, 0x100) + GEN_INT_ENTRY fp_unavailable, virt=1 +EXC_VIRT_END(fp_unavailable, 0x4800, 0x100) +EXC_COMMON_BEGIN(fp_unavailable_common) + GEN_COMMON fp_unavailable + bne 1f /* if from user, just load it up */ + RECONCILE_IRQ_STATE(r10, r11) + addi r3,r1,STACK_FRAME_OVERHEAD + bl kernel_fp_unavailable_exception +0: trap + EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0 +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_interrupt_return +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +2: /* User process was in a transaction */ + RECONCILE_IRQ_STATE(r10, r11) + addi r3,r1,STACK_FRAME_OVERHEAD + bl fp_unavailable_tm + b interrupt_return +#endif + + GEN_KVM fp_unavailable + + +/** + * Interrupt 0x900 - Decrementer Interrupt. + * This is an asynchronous interrupt in response to a decrementer exception + * (e.g., DEC has wrapped below zero). It is maskable in hardware by clearing + * MSR[EE], and soft-maskable with IRQS_DISABLED mask (i.e., + * local_irq_disable()). + * + * Handling: + * This calls into Linux timer handler. NVGPRs are not saved (see 0x500). + * + * If soft masked, the masked handler will note the pending interrupt for + * replay, and bump the decrementer to a high value, leaving MSR[EE] enabled + * in the interrupted context. + * If PPC_WATCHDOG is configured, the soft masked handler will actually set + * things back up to run soft_nmi_interrupt as a regular interrupt handler + * on the emergency stack. + */ +INT_DEFINE_BEGIN(decrementer) + IVEC=0x900 + IMASK=IRQS_DISABLED +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(decrementer) + +EXC_REAL_BEGIN(decrementer, 0x900, 0x80) + GEN_INT_ENTRY decrementer, virt=0 +EXC_REAL_END(decrementer, 0x900, 0x80) +EXC_VIRT_BEGIN(decrementer, 0x4900, 0x80) + GEN_INT_ENTRY decrementer, virt=1 +EXC_VIRT_END(decrementer, 0x4900, 0x80) +EXC_COMMON_BEGIN(decrementer_common) + GEN_COMMON decrementer + FINISH_NAP + RUNLATCH_ON + addi r3,r1,STACK_FRAME_OVERHEAD + bl timer_interrupt + b interrupt_return + + GEN_KVM decrementer + + +/** + * Interrupt 0x980 - Hypervisor Decrementer Interrupt. + * This is an asynchronous interrupt, similar to 0x900 but for the HDEC + * register. + * + * Handling: + * Linux does not use this outside KVM where it's used to keep a host timer + * while the guest is given control of DEC. It should normally be caught by + * the KVM test and routed there. + */ +INT_DEFINE_BEGIN(hdecrementer) + IVEC=0x980 + IHSRR=1 + ISTACK=0 + IRECONCILE=0 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(hdecrementer) + +EXC_REAL_BEGIN(hdecrementer, 0x980, 0x80) + GEN_INT_ENTRY hdecrementer, virt=0 +EXC_REAL_END(hdecrementer, 0x980, 0x80) +EXC_VIRT_BEGIN(hdecrementer, 0x4980, 0x80) + GEN_INT_ENTRY hdecrementer, virt=1 +EXC_VIRT_END(hdecrementer, 0x4980, 0x80) +EXC_COMMON_BEGIN(hdecrementer_common) + __GEN_COMMON_ENTRY hdecrementer + /* + * Hypervisor decrementer interrupts not caught by the KVM test + * shouldn't occur but are sometimes left pending on exit from a KVM + * guest. We don't need to do anything to clear them, as they are + * edge-triggered. + * + * Be careful to avoid touching the kernel stack. + */ + ld r10,PACA_EXGEN+EX_CTR(r13) + mtctr r10 + mtcrf 0x80,r9 + 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) + HRFI_TO_KERNEL + + GEN_KVM hdecrementer + + +/** + * Interrupt 0xa00 - Directed Privileged Doorbell Interrupt. + * This is an asynchronous interrupt in response to a msgsndp doorbell. + * It is maskable in hardware by clearing MSR[EE], and soft-maskable with + * IRQS_DISABLED mask (i.e., local_irq_disable()). + * + * Handling: + * Guests may use this for IPIs between threads in a core if the + * hypervisor supports it. NVGPRS are not saved (see 0x500). + * + * If soft masked, the masked handler will note the pending interrupt for + * replay, leaving MSR[EE] enabled in the interrupted context because the + * doorbells are edge triggered. + */ +INT_DEFINE_BEGIN(doorbell_super) + IVEC=0xa00 + IMASK=IRQS_DISABLED +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(doorbell_super) + +EXC_REAL_BEGIN(doorbell_super, 0xa00, 0x100) + GEN_INT_ENTRY doorbell_super, virt=0 +EXC_REAL_END(doorbell_super, 0xa00, 0x100) +EXC_VIRT_BEGIN(doorbell_super, 0x4a00, 0x100) + GEN_INT_ENTRY doorbell_super, virt=1 +EXC_VIRT_END(doorbell_super, 0x4a00, 0x100) +EXC_COMMON_BEGIN(doorbell_super_common) + GEN_COMMON doorbell_super + FINISH_NAP + RUNLATCH_ON + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_PPC_DOORBELL + bl doorbell_exception +#else + bl unknown_exception +#endif + b interrupt_return + + GEN_KVM doorbell_super + + +EXC_REAL_NONE(0xb00, 0x100) +EXC_VIRT_NONE(0x4b00, 0x100) + +/** + * Interrupt 0xc00 - System Call Interrupt (syscall, hcall). + * This is a synchronous interrupt invoked with the "sc" instruction. The + * system call is invoked with "sc 0" and does not alter the HV bit, so it + * is directed to the currently running OS. The hypercall is invoked with + * "sc 1" and it sets HV=1, so it elevates to hypervisor. + * + * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to + * 0x4c00 virtual mode. + * + * Handling: + * If the KVM test fires then it was due to a hypercall and is accordingly + * routed to KVM. Otherwise this executes a normal Linux system call. + * + * Call convention: + * + * syscall and hypercalls register conventions are documented in + * Documentation/powerpc/syscall64-abi.rst and + * Documentation/powerpc/papr_hcalls.rst respectively. + * + * 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. + */ +INT_DEFINE_BEGIN(system_call) + IVEC=0xc00 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(system_call) + +.macro SYSTEM_CALL virt +#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. + */ + mtctr r13 + GET_PACA(r13) + std r10,PACA_EXGEN+EX_R10(r13) + INTERRUPT_TO_KERNEL + KVMTEST system_call /* uses r10, branch to system_call_kvm */ + mfctr r9 +#else + mr r9,r13 + GET_PACA(r13) + INTERRUPT_TO_KERNEL +#endif + +#ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH +BEGIN_FTR_SECTION + cmpdi r0,0x1ebe + beq- 1f +END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) +#endif + + /* We reach here with PACA in r13, r13 in r9. */ + mfspr r11,SPRN_SRR0 + mfspr r12,SPRN_SRR1 + + HMT_MEDIUM + + .if ! \virt + __LOAD_HANDLER(r10, system_call_common) + mtspr SPRN_SRR0,r10 + ld r10,PACAKMSR(r13) + mtspr SPRN_SRR1,r10 + RFI_TO_KERNEL + b . /* prevent speculative execution */ + .else + li r10,MSR_RI + mtmsrd r10,1 /* Set RI (EE=0) */ +#ifdef CONFIG_RELOCATABLE + __LOAD_HANDLER(r10, system_call_common) + mtctr r10 + bctr +#else + b system_call_common +#endif + .endif + +#ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH + /* 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 */ +#endif +.endm + +EXC_REAL_BEGIN(system_call, 0xc00, 0x100) + SYSTEM_CALL 0 +EXC_REAL_END(system_call, 0xc00, 0x100) +EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100) + SYSTEM_CALL 1 +EXC_VIRT_END(system_call, 0x4c00, 0x100) + +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER +TRAMP_REAL_BEGIN(system_call_kvm) + /* + * This is a hcall, so register convention is as above, with these + * differences: + * r13 = PACA + * ctr = orig r13 + * orig r10 saved in PACA + */ + /* + * 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). + */ +BEGIN_FTR_SECTION + mfspr r10,SPRN_PPR + std r10,HSTATE_PPR(r13) +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + HMT_MEDIUM + mfctr r10 + SET_SCRATCH0(r10) + mfcr r10 + std r12,HSTATE_SCRATCH0(r13) + sldi r12,r10,32 + ori r12,r12,0xc00 +#ifdef CONFIG_RELOCATABLE + /* + * Requires __LOAD_FAR_HANDLER beause kvmppc_interrupt lives + * outside the head section. + */ + __LOAD_FAR_HANDLER(r10, kvmppc_interrupt) + mtctr r10 + ld r10,PACA_EXGEN+EX_R10(r13) + bctr +#else + ld r10,PACA_EXGEN+EX_R10(r13) + b kvmppc_interrupt +#endif +#endif + + +/** + * Interrupt 0xd00 - Trace Interrupt. + * This is a synchronous interrupt in response to instruction step or + * breakpoint faults. + */ +INT_DEFINE_BEGIN(single_step) + IVEC=0xd00 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(single_step) + +EXC_REAL_BEGIN(single_step, 0xd00, 0x100) + GEN_INT_ENTRY single_step, virt=0 +EXC_REAL_END(single_step, 0xd00, 0x100) +EXC_VIRT_BEGIN(single_step, 0x4d00, 0x100) + GEN_INT_ENTRY single_step, virt=1 +EXC_VIRT_END(single_step, 0x4d00, 0x100) +EXC_COMMON_BEGIN(single_step_common) + GEN_COMMON single_step + addi r3,r1,STACK_FRAME_OVERHEAD + bl single_step_exception + b interrupt_return + + GEN_KVM single_step + + +/** + * Interrupt 0xe00 - Hypervisor Data Storage Interrupt (HDSI). + * This is a synchronous interrupt in response to an MMU fault caused by a + * guest data access. + * + * Handling: + * This should always get routed to KVM. In radix MMU mode, this is caused + * by a guest nested radix access that can't be performed due to the + * partition scope page table. In hash mode, this can be caused by guests + * running with translation disabled (virtual real mode) or with VPM enabled. + * KVM will update the page table structures or disallow the access. + */ +INT_DEFINE_BEGIN(h_data_storage) + IVEC=0xe00 + IHSRR=1 + IDAR=1 + IDSISR=1 + IKVM_SKIP=1 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(h_data_storage) + +EXC_REAL_BEGIN(h_data_storage, 0xe00, 0x20) + GEN_INT_ENTRY h_data_storage, virt=0, ool=1 +EXC_REAL_END(h_data_storage, 0xe00, 0x20) +EXC_VIRT_BEGIN(h_data_storage, 0x4e00, 0x20) + GEN_INT_ENTRY h_data_storage, virt=1, ool=1 +EXC_VIRT_END(h_data_storage, 0x4e00, 0x20) +EXC_COMMON_BEGIN(h_data_storage_common) + GEN_COMMON h_data_storage + addi r3,r1,STACK_FRAME_OVERHEAD +BEGIN_MMU_FTR_SECTION + ld r4,_DAR(r1) + li r5,SIGSEGV + bl bad_page_fault +MMU_FTR_SECTION_ELSE + bl unknown_exception +ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX) + b interrupt_return + + GEN_KVM h_data_storage + + +/** + * Interrupt 0xe20 - Hypervisor Instruction Storage Interrupt (HISI). + * This is a synchronous interrupt in response to an MMU fault caused by a + * guest instruction fetch, similar to HDSI. + */ +INT_DEFINE_BEGIN(h_instr_storage) + IVEC=0xe20 + IHSRR=1 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(h_instr_storage) + +EXC_REAL_BEGIN(h_instr_storage, 0xe20, 0x20) + GEN_INT_ENTRY h_instr_storage, virt=0, ool=1 +EXC_REAL_END(h_instr_storage, 0xe20, 0x20) +EXC_VIRT_BEGIN(h_instr_storage, 0x4e20, 0x20) + GEN_INT_ENTRY h_instr_storage, virt=1, ool=1 +EXC_VIRT_END(h_instr_storage, 0x4e20, 0x20) +EXC_COMMON_BEGIN(h_instr_storage_common) + GEN_COMMON h_instr_storage + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return + + GEN_KVM h_instr_storage + + +/** + * Interrupt 0xe40 - Hypervisor Emulation Assistance Interrupt. + */ +INT_DEFINE_BEGIN(emulation_assist) + IVEC=0xe40 + IHSRR=1 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(emulation_assist) + +EXC_REAL_BEGIN(emulation_assist, 0xe40, 0x20) + GEN_INT_ENTRY emulation_assist, virt=0, ool=1 +EXC_REAL_END(emulation_assist, 0xe40, 0x20) +EXC_VIRT_BEGIN(emulation_assist, 0x4e40, 0x20) + GEN_INT_ENTRY emulation_assist, virt=1, ool=1 +EXC_VIRT_END(emulation_assist, 0x4e40, 0x20) +EXC_COMMON_BEGIN(emulation_assist_common) + GEN_COMMON emulation_assist + addi r3,r1,STACK_FRAME_OVERHEAD + bl emulation_assist_interrupt + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ + b interrupt_return + + GEN_KVM emulation_assist + + +/** + * Interrupt 0xe60 - Hypervisor Maintenance Interrupt (HMI). + * This is an asynchronous interrupt caused by a Hypervisor Maintenance + * Exception. It is always taken in real mode but uses HSRR registers + * unlike SRESET and MCE. + * + * It is maskable in hardware by clearing MSR[EE], and partially soft-maskable + * with IRQS_DISABLED mask (i.e., local_irq_disable()). + * + * Handling: + * This is a special case, this is handled similarly to machine checks, with an + * initial real mode handler that is not soft-masked, which attempts to fix the + * problem. Then a regular handler which is soft-maskable and reports the + * problem. + * + * The emergency stack is used for the early real mode handler. + * + * XXX: unclear why MCE and HMI schemes could not be made common, e.g., + * either use soft-masking for the MCE, or use irq_work for the HMI. + * + * KVM: + * Unlike MCE, this calls into KVM without calling the real mode handler + * first. + */ +INT_DEFINE_BEGIN(hmi_exception_early) + IVEC=0xe60 + IHSRR=1 + IREALMODE_COMMON=1 + ISTACK=0 + IRECONCILE=0 + IKUAP=0 /* We don't touch AMR here, we never go to virtual mode */ + IKVM_REAL=1 +INT_DEFINE_END(hmi_exception_early) + +INT_DEFINE_BEGIN(hmi_exception) + IVEC=0xe60 + IHSRR=1 + IMASK=IRQS_DISABLED + IKVM_REAL=1 +INT_DEFINE_END(hmi_exception) + +EXC_REAL_BEGIN(hmi_exception, 0xe60, 0x20) + GEN_INT_ENTRY hmi_exception_early, virt=0, ool=1 +EXC_REAL_END(hmi_exception, 0xe60, 0x20) +EXC_VIRT_NONE(0x4e60, 0x20) + +EXC_COMMON_BEGIN(hmi_exception_early_common) + __GEN_REALMODE_COMMON_ENTRY hmi_exception_early + + mr r10,r1 /* Save r1 */ + ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */ + subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ + + __GEN_COMMON_BODY hmi_exception_early + + addi r3,r1,STACK_FRAME_OVERHEAD + bl hmi_exception_realmode + cmpdi cr0,r3,0 + bne 1f + + EXCEPTION_RESTORE_REGS hsrr=1 + HRFI_TO_USER_OR_KERNEL + +1: + /* + * Go to virtual mode and pull the HMI event information from + * firmware. + */ + EXCEPTION_RESTORE_REGS hsrr=1 + GEN_INT_ENTRY hmi_exception, virt=0 + + GEN_KVM hmi_exception_early + +EXC_COMMON_BEGIN(hmi_exception_common) + GEN_COMMON hmi_exception + FINISH_NAP + RUNLATCH_ON + addi r3,r1,STACK_FRAME_OVERHEAD + bl handle_hmi_exception + b interrupt_return + + GEN_KVM hmi_exception + + +/** + * Interrupt 0xe80 - Directed Hypervisor Doorbell Interrupt. + * This is an asynchronous interrupt in response to a msgsnd doorbell. + * Similar to the 0xa00 doorbell but for host rather than guest. + */ +INT_DEFINE_BEGIN(h_doorbell) + IVEC=0xe80 + IHSRR=1 + IMASK=IRQS_DISABLED + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(h_doorbell) + +EXC_REAL_BEGIN(h_doorbell, 0xe80, 0x20) + GEN_INT_ENTRY h_doorbell, virt=0, ool=1 +EXC_REAL_END(h_doorbell, 0xe80, 0x20) +EXC_VIRT_BEGIN(h_doorbell, 0x4e80, 0x20) + GEN_INT_ENTRY h_doorbell, virt=1, ool=1 +EXC_VIRT_END(h_doorbell, 0x4e80, 0x20) +EXC_COMMON_BEGIN(h_doorbell_common) + GEN_COMMON h_doorbell + FINISH_NAP + RUNLATCH_ON + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_PPC_DOORBELL + bl doorbell_exception +#else + bl unknown_exception +#endif + b interrupt_return + + GEN_KVM h_doorbell + + +/** + * Interrupt 0xea0 - Hypervisor Virtualization Interrupt. + * This is an asynchronous interrupt in response to an "external exception". + * Similar to 0x500 but for host only. + */ +INT_DEFINE_BEGIN(h_virt_irq) + IVEC=0xea0 + IHSRR=1 + IMASK=IRQS_DISABLED + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(h_virt_irq) + +EXC_REAL_BEGIN(h_virt_irq, 0xea0, 0x20) + GEN_INT_ENTRY h_virt_irq, virt=0, ool=1 +EXC_REAL_END(h_virt_irq, 0xea0, 0x20) +EXC_VIRT_BEGIN(h_virt_irq, 0x4ea0, 0x20) + GEN_INT_ENTRY h_virt_irq, virt=1, ool=1 +EXC_VIRT_END(h_virt_irq, 0x4ea0, 0x20) +EXC_COMMON_BEGIN(h_virt_irq_common) + GEN_COMMON h_virt_irq + FINISH_NAP + RUNLATCH_ON + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_IRQ + b interrupt_return + + GEN_KVM h_virt_irq + + +EXC_REAL_NONE(0xec0, 0x20) +EXC_VIRT_NONE(0x4ec0, 0x20) +EXC_REAL_NONE(0xee0, 0x20) +EXC_VIRT_NONE(0x4ee0, 0x20) + + +/* + * Interrupt 0xf00 - Performance Monitor Interrupt (PMI, PMU). + * This is an asynchronous interrupt in response to a PMU exception. + * It is maskable in hardware by clearing MSR[EE], and soft-maskable with + * IRQS_PMI_DISABLED mask (NOTE: NOT local_irq_disable()). + * + * Handling: + * This calls into the perf subsystem. + * + * Like the watchdog soft-nmi, it appears an NMI interrupt to Linux, in that it + * runs under local_irq_disable. However it may be soft-masked in + * powerpc-specific code. + * + * If soft masked, the masked handler will note the pending interrupt for + * replay, and clear MSR[EE] in the interrupted context. + */ +INT_DEFINE_BEGIN(performance_monitor) + IVEC=0xf00 + IMASK=IRQS_PMI_DISABLED +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(performance_monitor) + +EXC_REAL_BEGIN(performance_monitor, 0xf00, 0x20) + GEN_INT_ENTRY performance_monitor, virt=0, ool=1 +EXC_REAL_END(performance_monitor, 0xf00, 0x20) +EXC_VIRT_BEGIN(performance_monitor, 0x4f00, 0x20) + GEN_INT_ENTRY performance_monitor, virt=1, ool=1 +EXC_VIRT_END(performance_monitor, 0x4f00, 0x20) +EXC_COMMON_BEGIN(performance_monitor_common) + GEN_COMMON performance_monitor + FINISH_NAP + RUNLATCH_ON + addi r3,r1,STACK_FRAME_OVERHEAD + bl performance_monitor_exception + b interrupt_return + + GEN_KVM performance_monitor + + +/** + * Interrupt 0xf20 - Vector Unavailable Interrupt. + * This is a synchronous interrupt in response to + * executing a vector (or altivec) instruction with MSR[VEC]=0. + * Similar to FP unavailable. + */ +INT_DEFINE_BEGIN(altivec_unavailable) + IVEC=0xf20 + IRECONCILE=0 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(altivec_unavailable) + +EXC_REAL_BEGIN(altivec_unavailable, 0xf20, 0x20) + GEN_INT_ENTRY altivec_unavailable, virt=0, ool=1 +EXC_REAL_END(altivec_unavailable, 0xf20, 0x20) +EXC_VIRT_BEGIN(altivec_unavailable, 0x4f20, 0x20) + GEN_INT_ENTRY altivec_unavailable, virt=1, ool=1 +EXC_VIRT_END(altivec_unavailable, 0x4f20, 0x20) +EXC_COMMON_BEGIN(altivec_unavailable_common) + GEN_COMMON altivec_unavailable +#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_interrupt_return +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +2: /* User process was in a transaction */ + RECONCILE_IRQ_STATE(r10, r11) + addi r3,r1,STACK_FRAME_OVERHEAD + bl altivec_unavailable_tm + b interrupt_return +#endif +1: +END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) +#endif + RECONCILE_IRQ_STATE(r10, r11) + addi r3,r1,STACK_FRAME_OVERHEAD + bl altivec_unavailable_exception + b interrupt_return + + GEN_KVM altivec_unavailable + + +/** + * Interrupt 0xf40 - VSX Unavailable Interrupt. + * This is a synchronous interrupt in response to + * executing a VSX instruction with MSR[VSX]=0. + * Similar to FP unavailable. + */ +INT_DEFINE_BEGIN(vsx_unavailable) + IVEC=0xf40 + IRECONCILE=0 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(vsx_unavailable) + +EXC_REAL_BEGIN(vsx_unavailable, 0xf40, 0x20) + GEN_INT_ENTRY vsx_unavailable, virt=0, ool=1 +EXC_REAL_END(vsx_unavailable, 0xf40, 0x20) +EXC_VIRT_BEGIN(vsx_unavailable, 0x4f40, 0x20) + GEN_INT_ENTRY vsx_unavailable, virt=1, ool=1 +EXC_VIRT_END(vsx_unavailable, 0x4f40, 0x20) +EXC_COMMON_BEGIN(vsx_unavailable_common) + GEN_COMMON vsx_unavailable +#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 */ + RECONCILE_IRQ_STATE(r10, r11) + addi r3,r1,STACK_FRAME_OVERHEAD + bl vsx_unavailable_tm + b interrupt_return +#endif +1: +END_FTR_SECTION_IFSET(CPU_FTR_VSX) +#endif + RECONCILE_IRQ_STATE(r10, r11) + addi r3,r1,STACK_FRAME_OVERHEAD + bl vsx_unavailable_exception + b interrupt_return + + GEN_KVM vsx_unavailable + + +/** + * Interrupt 0xf60 - Facility Unavailable Interrupt. + * This is a synchronous interrupt in response to + * executing an instruction without access to the facility that can be + * resolved by the OS (e.g., FSCR, MSR). + * Similar to FP unavailable. + */ +INT_DEFINE_BEGIN(facility_unavailable) + IVEC=0xf60 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(facility_unavailable) + +EXC_REAL_BEGIN(facility_unavailable, 0xf60, 0x20) + GEN_INT_ENTRY facility_unavailable, virt=0, ool=1 +EXC_REAL_END(facility_unavailable, 0xf60, 0x20) +EXC_VIRT_BEGIN(facility_unavailable, 0x4f60, 0x20) + GEN_INT_ENTRY facility_unavailable, virt=1, ool=1 +EXC_VIRT_END(facility_unavailable, 0x4f60, 0x20) +EXC_COMMON_BEGIN(facility_unavailable_common) + GEN_COMMON facility_unavailable + addi r3,r1,STACK_FRAME_OVERHEAD + bl facility_unavailable_exception + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ + b interrupt_return + + GEN_KVM facility_unavailable + + +/** + * Interrupt 0xf60 - Hypervisor Facility Unavailable Interrupt. + * This is a synchronous interrupt in response to + * executing an instruction without access to the facility that can only + * be resolved in HV mode (e.g., HFSCR). + * Similar to FP unavailable. + */ +INT_DEFINE_BEGIN(h_facility_unavailable) + IVEC=0xf80 + IHSRR=1 + IKVM_REAL=1 + IKVM_VIRT=1 +INT_DEFINE_END(h_facility_unavailable) + +EXC_REAL_BEGIN(h_facility_unavailable, 0xf80, 0x20) + GEN_INT_ENTRY h_facility_unavailable, virt=0, ool=1 +EXC_REAL_END(h_facility_unavailable, 0xf80, 0x20) +EXC_VIRT_BEGIN(h_facility_unavailable, 0x4f80, 0x20) + GEN_INT_ENTRY h_facility_unavailable, virt=1, ool=1 +EXC_VIRT_END(h_facility_unavailable, 0x4f80, 0x20) +EXC_COMMON_BEGIN(h_facility_unavailable_common) + GEN_COMMON h_facility_unavailable + addi r3,r1,STACK_FRAME_OVERHEAD + bl facility_unavailable_exception + REST_NVGPRS(r1) /* XXX Shouldn't be necessary in practice */ + b interrupt_return + + GEN_KVM h_facility_unavailable + + +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 +INT_DEFINE_BEGIN(cbe_system_error) + IVEC=0x1200 + IHSRR=1 + IKVM_SKIP=1 + IKVM_REAL=1 +INT_DEFINE_END(cbe_system_error) + +EXC_REAL_BEGIN(cbe_system_error, 0x1200, 0x100) + GEN_INT_ENTRY cbe_system_error, virt=0 +EXC_REAL_END(cbe_system_error, 0x1200, 0x100) +EXC_VIRT_NONE(0x5200, 0x100) +EXC_COMMON_BEGIN(cbe_system_error_common) + GEN_COMMON cbe_system_error + addi r3,r1,STACK_FRAME_OVERHEAD + bl cbe_system_error_exception + b interrupt_return + + GEN_KVM cbe_system_error + +#else /* CONFIG_CBE_RAS */ +EXC_REAL_NONE(0x1200, 0x100) +EXC_VIRT_NONE(0x5200, 0x100) +#endif + + +INT_DEFINE_BEGIN(instruction_breakpoint) + IVEC=0x1300 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_SKIP=1 + IKVM_REAL=1 +#endif +INT_DEFINE_END(instruction_breakpoint) + +EXC_REAL_BEGIN(instruction_breakpoint, 0x1300, 0x100) + GEN_INT_ENTRY instruction_breakpoint, virt=0 +EXC_REAL_END(instruction_breakpoint, 0x1300, 0x100) +EXC_VIRT_BEGIN(instruction_breakpoint, 0x5300, 0x100) + GEN_INT_ENTRY instruction_breakpoint, virt=1 +EXC_VIRT_END(instruction_breakpoint, 0x5300, 0x100) +EXC_COMMON_BEGIN(instruction_breakpoint_common) + GEN_COMMON instruction_breakpoint + addi r3,r1,STACK_FRAME_OVERHEAD + bl instruction_breakpoint_exception + b interrupt_return + + GEN_KVM instruction_breakpoint + + +EXC_REAL_NONE(0x1400, 0x100) +EXC_VIRT_NONE(0x5400, 0x100) + +/** + * Interrupt 0x1500 - Soft Patch Interrupt + * + * Handling: + * This is an implementation specific interrupt which can be used for a + * range of exceptions. + * + * This interrupt handler is unique in that it runs the denormal assist + * code even for guests (and even in guest context) without going to KVM, + * for speed. POWER9 does not raise denorm exceptions, so this special case + * could be phased out in future to reduce special cases. + */ +INT_DEFINE_BEGIN(denorm_exception) + IVEC=0x1500 + IHSRR=1 + IBRANCH_TO_COMMON=0 + IKVM_REAL=1 +INT_DEFINE_END(denorm_exception) + +EXC_REAL_BEGIN(denorm_exception, 0x1500, 0x100) + GEN_INT_ENTRY denorm_exception, virt=0 +#ifdef CONFIG_PPC_DENORMALISATION + andis. r10,r12,(HSRR1_DENORM)@h /* denorm? */ + bne+ denorm_assist +#endif + GEN_BRANCH_TO_COMMON denorm_exception, virt=0 +EXC_REAL_END(denorm_exception, 0x1500, 0x100) +#ifdef CONFIG_PPC_DENORMALISATION +EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100) + GEN_INT_ENTRY denorm_exception, virt=1 + andis. r10,r12,(HSRR1_DENORM)@h /* denorm? */ + bne+ denorm_assist + GEN_BRANCH_TO_COMMON denorm_exception, virt=1 +EXC_VIRT_END(denorm_exception, 0x5500, 0x100) +#else +EXC_VIRT_NONE(0x5500, 0x100) +#endif + +#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 + + .Lreg=0 + .rept 32 + fmr .Lreg,.Lreg + .Lreg=.Lreg+1 + .endr + +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 + + .Lreg=0 + .rept 32 + XVCPSGNDP(.Lreg,.Lreg,.Lreg) + .Lreg=.Lreg+1 + .endr + +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 + */ + .Lreg=32 + .rept 32 + XVCPSGNDP(.Lreg,.Lreg,.Lreg) + .Lreg=.Lreg+1 + .endr + +denorm_done: + mfspr r11,SPRN_HSRR0 + subi r11,r11,4 + mtspr SPRN_HSRR0,r11 + mtcrf 0x80,r9 + ld r9,PACA_EXGEN+EX_R9(r13) +BEGIN_FTR_SECTION + ld r10,PACA_EXGEN+EX_PPR(r13) + mtspr SPRN_PPR,r10 +END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) +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_BEGIN(denorm_exception_common) + GEN_COMMON denorm_exception + addi r3,r1,STACK_FRAME_OVERHEAD + bl unknown_exception + b interrupt_return + + GEN_KVM denorm_exception + + +#ifdef CONFIG_CBE_RAS +INT_DEFINE_BEGIN(cbe_maintenance) + IVEC=0x1600 + IHSRR=1 + IKVM_SKIP=1 + IKVM_REAL=1 +INT_DEFINE_END(cbe_maintenance) + +EXC_REAL_BEGIN(cbe_maintenance, 0x1600, 0x100) + GEN_INT_ENTRY cbe_maintenance, virt=0 +EXC_REAL_END(cbe_maintenance, 0x1600, 0x100) +EXC_VIRT_NONE(0x5600, 0x100) +EXC_COMMON_BEGIN(cbe_maintenance_common) + GEN_COMMON cbe_maintenance + addi r3,r1,STACK_FRAME_OVERHEAD + bl cbe_maintenance_exception + b interrupt_return + + GEN_KVM cbe_maintenance + +#else /* CONFIG_CBE_RAS */ +EXC_REAL_NONE(0x1600, 0x100) +EXC_VIRT_NONE(0x5600, 0x100) +#endif + + +INT_DEFINE_BEGIN(altivec_assist) + IVEC=0x1700 +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + IKVM_REAL=1 +#endif +INT_DEFINE_END(altivec_assist) + +EXC_REAL_BEGIN(altivec_assist, 0x1700, 0x100) + GEN_INT_ENTRY altivec_assist, virt=0 +EXC_REAL_END(altivec_assist, 0x1700, 0x100) +EXC_VIRT_BEGIN(altivec_assist, 0x5700, 0x100) + GEN_INT_ENTRY altivec_assist, virt=1 +EXC_VIRT_END(altivec_assist, 0x5700, 0x100) +EXC_COMMON_BEGIN(altivec_assist_common) + GEN_COMMON altivec_assist + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_ALTIVEC + bl altivec_assist_exception + REST_NVGPRS(r1) /* instruction emulation may change GPRs */ +#else + bl unknown_exception +#endif + b interrupt_return + + GEN_KVM altivec_assist + + +#ifdef CONFIG_CBE_RAS +INT_DEFINE_BEGIN(cbe_thermal) + IVEC=0x1800 + IHSRR=1 + IKVM_SKIP=1 + IKVM_REAL=1 +INT_DEFINE_END(cbe_thermal) + +EXC_REAL_BEGIN(cbe_thermal, 0x1800, 0x100) + GEN_INT_ENTRY cbe_thermal, virt=0 +EXC_REAL_END(cbe_thermal, 0x1800, 0x100) +EXC_VIRT_NONE(0x5800, 0x100) +EXC_COMMON_BEGIN(cbe_thermal_common) + GEN_COMMON cbe_thermal + addi r3,r1,STACK_FRAME_OVERHEAD + bl cbe_thermal_exception + b interrupt_return + + GEN_KVM cbe_thermal + +#else /* CONFIG_CBE_RAS */ +EXC_REAL_NONE(0x1800, 0x100) +EXC_VIRT_NONE(0x5800, 0x100) +#endif + + +#ifdef CONFIG_PPC_WATCHDOG + +INT_DEFINE_BEGIN(soft_nmi) + IVEC=0x900 + ISTACK=0 + IRECONCILE=0 /* Soft-NMI may fire under local_irq_disable */ +INT_DEFINE_END(soft_nmi) + +/* + * 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) + mfspr r11,SPRN_SRR0 + mr r10,r1 + ld r1,PACAEMERGSP(r13) + subi r1,r1,INT_FRAME_SIZE + __GEN_COMMON_BODY soft_nmi + + /* + * Set IRQS_ALL_DISABLED and save PACAIRQHAPPENED (see + * system_reset_common) + */ + li r10,IRQS_ALL_DISABLED + stb r10,PACAIRQSOFTMASK(r13) + lbz r10,PACAIRQHAPPENED(r13) + std r10,RESULT(r1) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) + + addi r3,r1,STACK_FRAME_OVERHEAD + bl soft_nmi_interrupt + + /* Clear MSR_RI before setting SRR0 and SRR1. */ + li r9,0 + mtmsrd r9,1 + + /* + * Restore soft mask settings. + */ + ld r10,RESULT(r1) + stb r10,PACAIRQHAPPENED(r13) + ld r10,SOFTE(r1) + stb r10,PACAIRQSOFTMASK(r13) + + kuap_restore_amr r9, r10 + EXCEPTION_RESTORE_REGS hsrr=0 + RFI_TO_KERNEL + +#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 it is one of PACA_IRQ_MUST_HARD_MASK, so hard disable and return. + * This is called with r10 containing the value to OR to the paca field. + */ +.macro MASKED_INTERRUPT hsrr=0 + .if \hsrr +masked_Hinterrupt: + .else +masked_interrupt: + .endif + 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 +#ifdef CONFIG_PPC_WATCHDOG + b soft_nmi_common +#else + b 2f +#endif +1: andi. r10,r10,PACA_IRQ_MUST_HARD_MASK + beq 2f + xori r12,r12,MSR_EE /* clear MSR_EE */ + .if \hsrr + mtspr SPRN_HSRR1,r12 + .else + mtspr SPRN_SRR1,r12 + .endif + ori r11,r11,PACA_IRQ_HARD_DIS + stb r11,PACAIRQHAPPENED(r13) +2: /* done */ + ld r10,PACA_EXGEN+EX_CTR(r13) + mtctr r10 + mtcrf 0x80,r9 + std r1,PACAR1(r13) + 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) + /* May return to masked low address where r13 is not set up */ + .if \hsrr + HRFI_TO_KERNEL + .else + RFI_TO_KERNEL + .endif + b . +.endm + +TRAMP_REAL_BEGIN(stf_barrier_fallback) + std r9,PACA_EXRFI+EX_R9(r13) + std r10,PACA_EXRFI+EX_R10(r13) + sync + ld r9,PACA_EXRFI+EX_R9(r13) + ld r10,PACA_EXRFI+EX_R10(r13) + ori 31,31,0 + .rept 14 + b 1f +1: + .endr + blr + +/* Clobbers r10, r11, ctr */ +.macro L1D_DISPLACEMENT_FLUSH + ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) + ld r11,PACA_L1D_FLUSH_SIZE(r13) + srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */ + mtctr r11 + DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ + + /* order ld/st prior to dcbt stop all streams with flushing */ + sync + + /* + * The load addresses are at staggered offsets within cachelines, + * which suits some pipelines better (on others it should not + * hurt). + */ +1: + ld r11,(0x80 + 8)*0(r10) + ld r11,(0x80 + 8)*1(r10) + ld r11,(0x80 + 8)*2(r10) + ld r11,(0x80 + 8)*3(r10) + ld r11,(0x80 + 8)*4(r10) + ld r11,(0x80 + 8)*5(r10) + ld r11,(0x80 + 8)*6(r10) + ld r11,(0x80 + 8)*7(r10) + addi r10,r10,0x80*8 + bdnz 1b +.endm + +TRAMP_REAL_BEGIN(entry_flush_fallback) + std r9,PACA_EXRFI+EX_R9(r13) + std r10,PACA_EXRFI+EX_R10(r13) + std r11,PACA_EXRFI+EX_R11(r13) + mfctr r9 + L1D_DISPLACEMENT_FLUSH + mtctr r9 + ld r9,PACA_EXRFI+EX_R9(r13) + ld r10,PACA_EXRFI+EX_R10(r13) + ld r11,PACA_EXRFI+EX_R11(r13) + blr + +/* + * The SCV entry flush happens with interrupts enabled, so it must disable + * to prevent EXRFI being clobbered by NMIs (e.g., soft_nmi_common). r10 + * (containing LR) does not need to be preserved here because scv entry + * puts 0 in the pt_regs, CTR can be clobbered for the same reason. + */ +TRAMP_REAL_BEGIN(scv_entry_flush_fallback) + li r10,0 + mtmsrd r10,1 + lbz r10,PACAIRQHAPPENED(r13) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) + std r11,PACA_EXRFI+EX_R11(r13) + L1D_DISPLACEMENT_FLUSH + ld r11,PACA_EXRFI+EX_R11(r13) + li r10,MSR_RI + mtmsrd r10,1 + blr + +TRAMP_REAL_BEGIN(rfi_flush_fallback) + SET_SCRATCH0(r13); + GET_PACA(r13); + std r1,PACA_EXRFI+EX_R12(r13) + ld r1,PACAKSAVE(r13) + std r9,PACA_EXRFI+EX_R9(r13) + std r10,PACA_EXRFI+EX_R10(r13) + std r11,PACA_EXRFI+EX_R11(r13) + mfctr r9 + L1D_DISPLACEMENT_FLUSH + mtctr r9 + ld r9,PACA_EXRFI+EX_R9(r13) + ld r10,PACA_EXRFI+EX_R10(r13) + ld r11,PACA_EXRFI+EX_R11(r13) + ld r1,PACA_EXRFI+EX_R12(r13) + GET_SCRATCH0(r13); + rfid + +TRAMP_REAL_BEGIN(hrfi_flush_fallback) + SET_SCRATCH0(r13); + GET_PACA(r13); + std r1,PACA_EXRFI+EX_R12(r13) + ld r1,PACAKSAVE(r13) + std r9,PACA_EXRFI+EX_R9(r13) + std r10,PACA_EXRFI+EX_R10(r13) + std r11,PACA_EXRFI+EX_R11(r13) + mfctr r9 + L1D_DISPLACEMENT_FLUSH + mtctr r9 + ld r9,PACA_EXRFI+EX_R9(r13) + ld r10,PACA_EXRFI+EX_R10(r13) + ld r11,PACA_EXRFI+EX_R11(r13) + ld r1,PACA_EXRFI+EX_R12(r13) + GET_SCRATCH0(r13); + hrfid + +TRAMP_REAL_BEGIN(rfscv_flush_fallback) + /* system call volatile */ + mr r7,r13 + GET_PACA(r13); + mr r8,r1 + ld r1,PACAKSAVE(r13) + mfctr r9 + ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13) + ld r11,PACA_L1D_FLUSH_SIZE(r13) + srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */ + mtctr r11 + DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */ + + /* order ld/st prior to dcbt stop all streams with flushing */ + sync + + /* + * The load adresses are at staggered offsets within cachelines, + * which suits some pipelines better (on others it should not + * hurt). + */ +1: + ld r11,(0x80 + 8)*0(r10) + ld r11,(0x80 + 8)*1(r10) + ld r11,(0x80 + 8)*2(r10) + ld r11,(0x80 + 8)*3(r10) + ld r11,(0x80 + 8)*4(r10) + ld r11,(0x80 + 8)*5(r10) + ld r11,(0x80 + 8)*6(r10) + ld r11,(0x80 + 8)*7(r10) + addi r10,r10,0x80*8 + bdnz 1b + + mtctr r9 + li r9,0 + li r10,0 + li r11,0 + mr r1,r8 + mr r13,r7 + RFSCV + +USE_TEXT_SECTION() + +_GLOBAL(do_uaccess_flush) + UACCESS_FLUSH_FIXUP_SECTION + nop + nop + nop + blr + L1D_DISPLACEMENT_FLUSH + blr +_ASM_NOKPROBE_SYMBOL(do_uaccess_flush) +EXPORT_SYMBOL(do_uaccess_flush) + + +MASKED_INTERRUPT +MASKED_INTERRUPT hsrr=1 + +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER +kvmppc_skip_interrupt: + /* + * Here all GPRs are unchanged from when the interrupt happened + * except for r13, which is saved in SPRG_SCRATCH0. + */ + mfspr r13, SPRN_SRR0 + addi r13, r13, 4 + mtspr SPRN_SRR0, r13 + GET_SCRATCH0(r13) + RFI_TO_KERNEL + b . + +kvmppc_skip_Hinterrupt: + /* + * Here all GPRs are unchanged from when the interrupt happened + * except for r13, which is saved in SPRG_SCRATCH0. + */ + mfspr r13, SPRN_HSRR0 + addi r13, r13, 4 + mtspr SPRN_HSRR0, r13 + GET_SCRATCH0(r13) + HRFI_TO_KERNEL + b . +#endif + + /* + * 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) + /* + * All code below __end_interrupts is treated as soft-masked. If + * any code runs here with MSR[EE]=1, it must then cope with pending + * soft interrupt being raised (i.e., by ensuring it is replayed). + * + * 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 + /* + * Called by exception entry code if _TLF_NAPPING was set, this clears + * the NAPPING flag, and redirects the exception exit to + * power4_fixup_nap_return. + */ + .globl power4_fixup_nap +EXC_COMMON_BEGIN(power4_fixup_nap) + andc r9,r9,r10 + std r9,TI_LOCAL_FLAGS(r11) + LOAD_REG_ADDR(r10, power4_idle_nap_return) + std r10,_NIP(r1) + blr + +power4_idle_nap_return: + 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() + +/* MSR[RI] should be clear because this uses SRR[01] */ +enable_machine_check: + mflr r0 + bcl 20,31,$+4 +0: mflr r3 + addi r3,r3,(1f - 0b) + mtspr SPRN_SRR0,r3 + mfmsr r3 + ori r3,r3,MSR_ME + mtspr SPRN_SRR1,r3 + RFI_TO_KERNEL +1: mtlr r0 + blr + +/* MSR[RI] should be clear because this uses SRR[01] */ +disable_machine_check: + mflr r0 + bcl 20,31,$+4 +0: mflr r3 + addi r3,r3,(1f - 0b) + mtspr SPRN_SRR0,r3 + mfmsr r3 + li r4,MSR_ME + andc r3,r3,r4 + mtspr SPRN_SRR1,r3 + RFI_TO_KERNEL +1: mtlr r0 + blr + +/* + * Hash table stuff + */ + .balign IFETCH_ALIGN_BYTES +do_hash_page: +#ifdef CONFIG_PPC_BOOK3S_64 + lis r0,(DSISR_BAD_FAULT_64S | DSISR_DABRMATCH | DSISR_KEYFAULT)@h + ori r0,r0,DSISR_BAD_FAULT_64S@l + and. r0,r5,r0 /* weird error? */ + bne- handle_page_fault /* if not, try to insert a HPTE */ + + /* + * If we are in an "NMI" (e.g., an interrupt when soft-disabled), then + * don't call hash_page, just fail the fault. This is required to + * prevent re-entrancy problems in the hash code, namely perf + * interrupts hitting while something holds H_PAGE_BUSY, and taking a + * hash fault. See the comment in hash_preload(). + */ + ld r11, PACA_THREAD_INFO(r13) + lwz r0,TI_PREEMPT(r11) + andis. r0,r0,NMI_MASK@h + bne 77f + + /* + * r3 contains the trap number + * r4 contains the faulting address + * r5 contains dsisr + * r6 msr + * + * 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 interrupt_return /* Return from exception on success */ + + /* Error */ + blt- 13f + + /* Reload DAR/DSISR into r4/r5 for the DABR check below */ + ld r4,_DAR(r1) + ld r5,_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,r5,DSISR_DABRMATCH@h + bne- handle_dabr_fault + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_page_fault + cmpdi r3,0 + beq+ interrupt_return + mr r5,r3 + addi r3,r1,STACK_FRAME_OVERHEAD + ld r4,_DAR(r1) + bl bad_page_fault + b interrupt_return + +/* We have a data breakpoint exception - handle it */ +handle_dabr_fault: + ld r4,_DAR(r1) + ld r5,_DSISR(r1) + addi r3,r1,STACK_FRAME_OVERHEAD + bl do_break + /* + * do_break() may have changed the NV GPRS while handling a breakpoint. + * If so, we need to restore them with their updated values. + */ + REST_NVGPRS(r1) + b interrupt_return + + +#ifdef CONFIG_PPC_BOOK3S_64 +/* We have a page fault that hash_page could handle but HV refused + * the PTE insertion + */ +13: mr r5,r3 + addi r3,r1,STACK_FRAME_OVERHEAD + ld r4,_DAR(r1) + bl low_hash_fault + b interrupt_return +#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: addi r3,r1,STACK_FRAME_OVERHEAD + li r5,SIGSEGV + bl bad_page_fault + b interrupt_return |