| #ifndef _ASM_POWERPC_EXCEPTION_H |
| #define _ASM_POWERPC_EXCEPTION_H |
| /* |
| * Extracted from head_64.S |
| * |
| * PowerPC version |
| * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| * |
| * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP |
| * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> |
| * Adapted for Power Macintosh by Paul Mackerras. |
| * Low-level exception handlers and MMU support |
| * rewritten by Paul Mackerras. |
| * Copyright (C) 1996 Paul Mackerras. |
| * |
| * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and |
| * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com |
| * |
| * This file contains the low-level support and setup for the |
| * PowerPC-64 platform, including trap and interrupt dispatch. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| /* |
| * The following macros define the code that appears as |
| * the prologue to each of the exception handlers. They |
| * are split into two parts to allow a single kernel binary |
| * to be used for pSeries and iSeries. |
| * |
| * We make as much of the exception code common between native |
| * exception handlers (including pSeries LPAR) and iSeries LPAR |
| * implementations as possible. |
| */ |
| |
| #define EX_R9 0 |
| #define EX_R10 8 |
| #define EX_R11 16 |
| #define EX_R12 24 |
| #define EX_R13 32 |
| #define EX_SRR0 40 |
| #define EX_DAR 48 |
| #define EX_DSISR 56 |
| #define EX_CCR 60 |
| #define EX_R3 64 |
| #define EX_LR 72 |
| #define EX_CFAR 80 |
| |
| #ifdef CONFIG_RELOCATABLE |
| #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \ |
| ld r12,PACAKBASE(r13); /* get high part of &label */ \ |
| mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \ |
| LOAD_HANDLER(r12,label); \ |
| mtlr r12; \ |
| mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \ |
| li r10,MSR_RI; \ |
| mtmsrd r10,1; /* Set RI (EE=0) */ \ |
| blr; |
| #else |
| /* If not relocatable, we can jump directly -- and save messing with LR */ |
| #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \ |
| mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \ |
| mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \ |
| li r10,MSR_RI; \ |
| mtmsrd r10,1; /* Set RI (EE=0) */ \ |
| b label; |
| #endif |
| |
| /* |
| * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on |
| * so no need to rfid. Save lr in case we're CONFIG_RELOCATABLE, in which |
| * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr. |
| */ |
| #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec) \ |
| EXCEPTION_PROLOG_1(area, extra, vec); \ |
| EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) |
| |
| /* |
| * We're short on space and time in the exception prolog, so we can't |
| * use the normal SET_REG_IMMEDIATE macro. Normally we just need the |
| * low halfword of the address, but for Kdump we need the whole low |
| * word. |
| */ |
| #define LOAD_HANDLER(reg, label) \ |
| /* Handlers must be within 64K of kbase, which must be 64k aligned */ \ |
| ori reg,reg,(label)-_stext; /* virt addr of handler ... */ |
| |
| /* Exception register prefixes */ |
| #define EXC_HV H |
| #define EXC_STD |
| |
| #if defined(CONFIG_RELOCATABLE) |
| /* |
| * If we support interrupts with relocation on AND we're a relocatable |
| * kernel, we need to use LR to get to the 2nd level handler. So, save/restore |
| * it when required. |
| */ |
| #define SAVE_LR(reg, area) mflr reg ; std reg,area+EX_LR(r13) |
| #define GET_LR(reg, area) ld reg,area+EX_LR(r13) |
| #define RESTORE_LR(reg, area) ld reg,area+EX_LR(r13) ; mtlr reg |
| #else |
| /* ...else LR is unused and in register. */ |
| #define SAVE_LR(reg, area) |
| #define GET_LR(reg, area) mflr reg |
| #define RESTORE_LR(reg, area) |
| #endif |
| |
| #define __EXCEPTION_PROLOG_1(area, extra, vec) \ |
| GET_PACA(r13); \ |
| std r9,area+EX_R9(r13); /* save r9 - r12 */ \ |
| std r10,area+EX_R10(r13); \ |
| BEGIN_FTR_SECTION_NESTED(66); \ |
| mfspr r10,SPRN_CFAR; \ |
| std r10,area+EX_CFAR(r13); \ |
| END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \ |
| SAVE_LR(r10, area); \ |
| mfcr r9; \ |
| extra(vec); \ |
| std r11,area+EX_R11(r13); \ |
| std r12,area+EX_R12(r13); \ |
| GET_SCRATCH0(r10); \ |
| std r10,area+EX_R13(r13) |
| #define EXCEPTION_PROLOG_1(area, extra, vec) \ |
| __EXCEPTION_PROLOG_1(area, extra, vec) |
| |
| #define __EXCEPTION_PROLOG_PSERIES_1(label, h) \ |
| ld r12,PACAKBASE(r13); /* get high part of &label */ \ |
| ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \ |
| mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \ |
| LOAD_HANDLER(r12,label) \ |
| mtspr SPRN_##h##SRR0,r12; \ |
| mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \ |
| mtspr SPRN_##h##SRR1,r10; \ |
| h##rfid; \ |
| b . /* prevent speculative execution */ |
| #define EXCEPTION_PROLOG_PSERIES_1(label, h) \ |
| __EXCEPTION_PROLOG_PSERIES_1(label, h) |
| |
| #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec) \ |
| EXCEPTION_PROLOG_1(area, extra, vec); \ |
| EXCEPTION_PROLOG_PSERIES_1(label, h); |
| |
| #define __KVMTEST(n) \ |
| lbz r10,HSTATE_IN_GUEST(r13); \ |
| cmpwi r10,0; \ |
| bne do_kvm_##n |
| |
| #define __KVM_HANDLER(area, h, n) \ |
| do_kvm_##n: \ |
| ld r10,area+EX_R10(r13); \ |
| stw r9,HSTATE_SCRATCH1(r13); \ |
| ld r9,area+EX_R9(r13); \ |
| std r12,HSTATE_SCRATCH0(r13); \ |
| li r12,n; \ |
| b kvmppc_interrupt |
| |
| #define __KVM_HANDLER_SKIP(area, h, n) \ |
| do_kvm_##n: \ |
| cmpwi r10,KVM_GUEST_MODE_SKIP; \ |
| ld r10,area+EX_R10(r13); \ |
| beq 89f; \ |
| stw r9,HSTATE_SCRATCH1(r13); \ |
| ld r9,area+EX_R9(r13); \ |
| std r12,HSTATE_SCRATCH0(r13); \ |
| li r12,n; \ |
| b kvmppc_interrupt; \ |
| 89: mtocrf 0x80,r9; \ |
| ld r9,area+EX_R9(r13); \ |
| b kvmppc_skip_##h##interrupt |
| |
| #ifdef CONFIG_KVM_BOOK3S_64_HANDLER |
| #define KVMTEST(n) __KVMTEST(n) |
| #define KVM_HANDLER(area, h, n) __KVM_HANDLER(area, h, n) |
| #define KVM_HANDLER_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n) |
| |
| #else |
| #define KVMTEST(n) |
| #define KVM_HANDLER(area, h, n) |
| #define KVM_HANDLER_SKIP(area, h, n) |
| #endif |
| |
| #ifdef CONFIG_KVM_BOOK3S_PR |
| #define KVMTEST_PR(n) __KVMTEST(n) |
| #define KVM_HANDLER_PR(area, h, n) __KVM_HANDLER(area, h, n) |
| #define KVM_HANDLER_PR_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n) |
| |
| #else |
| #define KVMTEST_PR(n) |
| #define KVM_HANDLER_PR(area, h, n) |
| #define KVM_HANDLER_PR_SKIP(area, h, n) |
| #endif |
| |
| #define NOTEST(n) |
| |
| /* |
| * The common exception prolog is used for all except a few exceptions |
| * such as a segment miss on a kernel address. We have to be prepared |
| * to take another exception from the point where we first touch the |
| * kernel stack onwards. |
| * |
| * 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. |
| */ |
| #define EXCEPTION_PROLOG_COMMON(n, area) \ |
| andi. r10,r12,MSR_PR; /* See if coming from user */ \ |
| mr r10,r1; /* Save r1 */ \ |
| subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \ |
| beq- 1f; \ |
| ld r1,PACAKSAVE(r13); /* kernel stack to use */ \ |
| 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \ |
| blt+ cr1,3f; /* abort if it is */ \ |
| li r1,(n); /* will be reloaded later */ \ |
| sth r1,PACA_TRAP_SAVE(r13); \ |
| std r3,area+EX_R3(r13); \ |
| addi r3,r13,area; /* r3 -> where regs are saved*/ \ |
| RESTORE_LR(r1, area); \ |
| b bad_stack; \ |
| 3: 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 */ \ |
| ACCOUNT_CPU_USER_ENTRY(r9, r10); \ |
| 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 */ \ |
| ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \ |
| ld r10,area+EX_R10(r13); \ |
| std r9,GPR9(r1); \ |
| std r10,GPR10(r1); \ |
| ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \ |
| ld r10,area+EX_R12(r13); \ |
| ld r11,area+EX_R13(r13); \ |
| std r9,GPR11(r1); \ |
| std r10,GPR12(r1); \ |
| std r11,GPR13(r1); \ |
| BEGIN_FTR_SECTION_NESTED(66); \ |
| ld r10,area+EX_CFAR(r13); \ |
| std r10,ORIG_GPR3(r1); \ |
| END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \ |
| GET_LR(r9,area); /* Get LR, later save to stack */ \ |
| ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \ |
| std r9,_LINK(r1); \ |
| mfctr r10; /* save CTR in stackframe */ \ |
| std r10,_CTR(r1); \ |
| lbz r10,PACASOFTIRQEN(r13); \ |
| mfspr r11,SPRN_XER; /* save XER in stackframe */ \ |
| std r10,SOFTE(r1); \ |
| std r11,_XER(r1); \ |
| li r9,(n)+1; \ |
| 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 */ \ |
| ACCOUNT_STOLEN_TIME |
| |
| /* |
| * Exception vectors. |
| */ |
| #define STD_EXCEPTION_PSERIES(loc, vec, label) \ |
| . = loc; \ |
| .globl label##_pSeries; \ |
| label##_pSeries: \ |
| HMT_MEDIUM; \ |
| SET_SCRATCH0(r13); /* save r13 */ \ |
| EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \ |
| EXC_STD, KVMTEST_PR, vec) |
| |
| #define STD_EXCEPTION_HV(loc, vec, label) \ |
| . = loc; \ |
| .globl label##_hv; \ |
| label##_hv: \ |
| HMT_MEDIUM; \ |
| SET_SCRATCH0(r13); /* save r13 */ \ |
| EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \ |
| EXC_HV, KVMTEST, vec) |
| |
| #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label) \ |
| . = loc; \ |
| .globl label##_relon_pSeries; \ |
| label##_relon_pSeries: \ |
| HMT_MEDIUM; \ |
| /* No guest interrupts come through here */ \ |
| SET_SCRATCH0(r13); /* save r13 */ \ |
| EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \ |
| EXC_STD, KVMTEST_PR, vec) |
| |
| #define STD_RELON_EXCEPTION_HV(loc, vec, label) \ |
| . = loc; \ |
| .globl label##_relon_hv; \ |
| label##_relon_hv: \ |
| HMT_MEDIUM; \ |
| /* No guest interrupts come through here */ \ |
| SET_SCRATCH0(r13); /* save r13 */ \ |
| EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \ |
| EXC_HV, KVMTEST, vec) |
| |
| /* This associate vector numbers with bits in paca->irq_happened */ |
| #define SOFTEN_VALUE_0x500 PACA_IRQ_EE |
| #define SOFTEN_VALUE_0x502 PACA_IRQ_EE |
| #define SOFTEN_VALUE_0x900 PACA_IRQ_DEC |
| #define SOFTEN_VALUE_0x982 PACA_IRQ_DEC |
| |
| #define __SOFTEN_TEST(h, vec) \ |
| lbz r10,PACASOFTIRQEN(r13); \ |
| cmpwi r10,0; \ |
| li r10,SOFTEN_VALUE_##vec; \ |
| beq masked_##h##interrupt |
| #define _SOFTEN_TEST(h, vec) __SOFTEN_TEST(h, vec) |
| |
| #define SOFTEN_TEST_PR(vec) \ |
| KVMTEST_PR(vec); \ |
| _SOFTEN_TEST(EXC_STD, vec) |
| |
| #define SOFTEN_TEST_HV(vec) \ |
| KVMTEST(vec); \ |
| _SOFTEN_TEST(EXC_HV, vec) |
| |
| #define SOFTEN_TEST_HV_201(vec) \ |
| KVMTEST(vec); \ |
| _SOFTEN_TEST(EXC_STD, vec) |
| |
| #define SOFTEN_NOTEST_PR(vec) _SOFTEN_TEST(EXC_STD, vec) |
| #define SOFTEN_NOTEST_HV(vec) _SOFTEN_TEST(EXC_HV, vec) |
| |
| #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \ |
| HMT_MEDIUM; \ |
| SET_SCRATCH0(r13); /* save r13 */ \ |
| __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \ |
| EXCEPTION_PROLOG_PSERIES_1(label##_common, h); |
| #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \ |
| __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) |
| |
| #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label) \ |
| . = loc; \ |
| .globl label##_pSeries; \ |
| label##_pSeries: \ |
| _MASKABLE_EXCEPTION_PSERIES(vec, label, \ |
| EXC_STD, SOFTEN_TEST_PR) |
| |
| #define MASKABLE_EXCEPTION_HV(loc, vec, label) \ |
| . = loc; \ |
| .globl label##_hv; \ |
| label##_hv: \ |
| _MASKABLE_EXCEPTION_PSERIES(vec, label, \ |
| EXC_HV, SOFTEN_TEST_HV) |
| |
| #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \ |
| HMT_MEDIUM; \ |
| SET_SCRATCH0(r13); /* save r13 */ \ |
| __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \ |
| EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, h); |
| #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \ |
| __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) |
| |
| #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label) \ |
| . = loc; \ |
| .globl label##_relon_pSeries; \ |
| label##_relon_pSeries: \ |
| _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \ |
| EXC_STD, SOFTEN_NOTEST_PR) |
| |
| #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label) \ |
| . = loc; \ |
| .globl label##_relon_hv; \ |
| label##_relon_hv: \ |
| _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \ |
| EXC_HV, SOFTEN_NOTEST_HV) |
| |
| /* |
| * Our exception common code can be passed various "additions" |
| * to specify the behaviour of interrupts, whether to kick the |
| * runlatch, etc... |
| */ |
| |
| /* Exception addition: Hard disable interrupts */ |
| #define DISABLE_INTS SOFT_DISABLE_INTS(r10,r11) |
| |
| #define ADD_NVGPRS \ |
| bl .save_nvgprs |
| |
| #define RUNLATCH_ON \ |
| BEGIN_FTR_SECTION \ |
| CURRENT_THREAD_INFO(r3, r1); \ |
| ld r4,TI_LOCAL_FLAGS(r3); \ |
| andi. r0,r4,_TLF_RUNLATCH; \ |
| beql ppc64_runlatch_on_trampoline; \ |
| END_FTR_SECTION_IFSET(CPU_FTR_CTRL) |
| |
| #define EXCEPTION_COMMON(trap, label, hdlr, ret, additions) \ |
| .align 7; \ |
| .globl label##_common; \ |
| label##_common: \ |
| EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ |
| additions; \ |
| addi r3,r1,STACK_FRAME_OVERHEAD; \ |
| bl hdlr; \ |
| b ret |
| |
| #define STD_EXCEPTION_COMMON(trap, label, hdlr) \ |
| EXCEPTION_COMMON(trap, label, hdlr, ret_from_except, \ |
| ADD_NVGPRS;DISABLE_INTS) |
| |
| /* |
| * Like STD_EXCEPTION_COMMON, but for exceptions that can occur |
| * in the idle task and therefore need the special idle handling |
| * (finish nap and runlatch) |
| */ |
| #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr) \ |
| EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \ |
| FINISH_NAP;RUNLATCH_ON;DISABLE_INTS) |
| |
| /* |
| * 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 \ |
| CURRENT_THREAD_INFO(r11, r1); \ |
| 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 |
| |
| #endif /* _ASM_POWERPC_EXCEPTION_H */ |