mirror of https://gitee.com/openkylin/linux.git
348 lines
11 KiB
C
348 lines
11 KiB
C
#ifndef _ASM_POWERPC_EXCEPTION_H
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#define _ASM_POWERPC_EXCEPTION_H
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/*
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* Extracted from head_64.S
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*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
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* Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
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* Adapted for Power Macintosh by Paul Mackerras.
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* Low-level exception handlers and MMU support
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* rewritten by Paul Mackerras.
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* Copyright (C) 1996 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
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* Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
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*
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* This file contains the low-level support and setup for the
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* PowerPC-64 platform, including trap and interrupt dispatch.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/*
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* The following macros define the code that appears as
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* the prologue to each of the exception handlers. They
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* are split into two parts to allow a single kernel binary
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* to be used for pSeries and iSeries.
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*
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* We make as much of the exception code common between native
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* exception handlers (including pSeries LPAR) and iSeries LPAR
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* implementations as possible.
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*/
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#define EX_R9 0
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#define EX_R10 8
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#define EX_R11 16
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#define EX_R12 24
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#define EX_R13 32
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#define EX_SRR0 40
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#define EX_DAR 48
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#define EX_DSISR 56
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#define EX_CCR 60
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#define EX_R3 64
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#define EX_LR 72
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#define EX_CFAR 80
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/*
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* We're short on space and time in the exception prolog, so we can't
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* use the normal SET_REG_IMMEDIATE macro. Normally we just need the
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* low halfword of the address, but for Kdump we need the whole low
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* word.
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*/
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#define LOAD_HANDLER(reg, label) \
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addi reg,reg,(label)-_stext; /* virt addr of handler ... */
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/* Exception register prefixes */
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#define EXC_HV H
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#define EXC_STD
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#define __EXCEPTION_PROLOG_1(area, extra, vec) \
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GET_PACA(r13); \
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std r9,area+EX_R9(r13); /* save r9 - r12 */ \
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std r10,area+EX_R10(r13); \
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BEGIN_FTR_SECTION_NESTED(66); \
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mfspr r10,SPRN_CFAR; \
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std r10,area+EX_CFAR(r13); \
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END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
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mfcr r9; \
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extra(vec); \
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std r11,area+EX_R11(r13); \
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std r12,area+EX_R12(r13); \
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GET_SCRATCH0(r10); \
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std r10,area+EX_R13(r13)
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#define EXCEPTION_PROLOG_1(area, extra, vec) \
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__EXCEPTION_PROLOG_1(area, extra, vec)
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#define __EXCEPTION_PROLOG_PSERIES_1(label, h) \
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ld r12,PACAKBASE(r13); /* get high part of &label */ \
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ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \
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mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
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LOAD_HANDLER(r12,label) \
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mtspr SPRN_##h##SRR0,r12; \
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mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
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mtspr SPRN_##h##SRR1,r10; \
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h##rfid; \
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b . /* prevent speculative execution */
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#define EXCEPTION_PROLOG_PSERIES_1(label, h) \
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__EXCEPTION_PROLOG_PSERIES_1(label, h)
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#define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec) \
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EXCEPTION_PROLOG_1(area, extra, vec); \
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EXCEPTION_PROLOG_PSERIES_1(label, h);
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#define __KVMTEST(n) \
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lbz r10,HSTATE_IN_GUEST(r13); \
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cmpwi r10,0; \
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bne do_kvm_##n
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#define __KVM_HANDLER(area, h, n) \
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do_kvm_##n: \
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ld r10,area+EX_R10(r13); \
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stw r9,HSTATE_SCRATCH1(r13); \
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ld r9,area+EX_R9(r13); \
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std r12,HSTATE_SCRATCH0(r13); \
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li r12,n; \
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b kvmppc_interrupt
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#define __KVM_HANDLER_SKIP(area, h, n) \
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do_kvm_##n: \
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cmpwi r10,KVM_GUEST_MODE_SKIP; \
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ld r10,area+EX_R10(r13); \
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beq 89f; \
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stw r9,HSTATE_SCRATCH1(r13); \
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ld r9,area+EX_R9(r13); \
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std r12,HSTATE_SCRATCH0(r13); \
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li r12,n; \
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b kvmppc_interrupt; \
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89: mtocrf 0x80,r9; \
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ld r9,area+EX_R9(r13); \
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b kvmppc_skip_##h##interrupt
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#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
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#define KVMTEST(n) __KVMTEST(n)
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#define KVM_HANDLER(area, h, n) __KVM_HANDLER(area, h, n)
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#define KVM_HANDLER_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
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#else
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#define KVMTEST(n)
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#define KVM_HANDLER(area, h, n)
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#define KVM_HANDLER_SKIP(area, h, n)
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#endif
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#ifdef CONFIG_KVM_BOOK3S_PR
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#define KVMTEST_PR(n) __KVMTEST(n)
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#define KVM_HANDLER_PR(area, h, n) __KVM_HANDLER(area, h, n)
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#define KVM_HANDLER_PR_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
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#else
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#define KVMTEST_PR(n)
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#define KVM_HANDLER_PR(area, h, n)
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#define KVM_HANDLER_PR_SKIP(area, h, n)
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#endif
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#define NOTEST(n)
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/*
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* The common exception prolog is used for all except a few exceptions
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* such as a segment miss on a kernel address. We have to be prepared
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* to take another exception from the point where we first touch the
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* kernel stack onwards.
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*
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* On entry r13 points to the paca, r9-r13 are saved in the paca,
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* r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
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* SRR1, and relocation is on.
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*/
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#define EXCEPTION_PROLOG_COMMON(n, area) \
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andi. r10,r12,MSR_PR; /* See if coming from user */ \
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mr r10,r1; /* Save r1 */ \
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subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
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beq- 1f; \
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ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
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1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \
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blt+ cr1,3f; /* abort if it is */ \
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li r1,(n); /* will be reloaded later */ \
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sth r1,PACA_TRAP_SAVE(r13); \
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std r3,area+EX_R3(r13); \
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addi r3,r13,area; /* r3 -> where regs are saved*/ \
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b bad_stack; \
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3: std r9,_CCR(r1); /* save CR in stackframe */ \
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std r11,_NIP(r1); /* save SRR0 in stackframe */ \
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std r12,_MSR(r1); /* save SRR1 in stackframe */ \
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std r10,0(r1); /* make stack chain pointer */ \
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std r0,GPR0(r1); /* save r0 in stackframe */ \
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std r10,GPR1(r1); /* save r1 in stackframe */ \
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ACCOUNT_CPU_USER_ENTRY(r9, r10); \
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std r2,GPR2(r1); /* save r2 in stackframe */ \
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SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
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SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
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ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
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ld r10,area+EX_R10(r13); \
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std r9,GPR9(r1); \
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std r10,GPR10(r1); \
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ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
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ld r10,area+EX_R12(r13); \
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ld r11,area+EX_R13(r13); \
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std r9,GPR11(r1); \
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std r10,GPR12(r1); \
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std r11,GPR13(r1); \
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BEGIN_FTR_SECTION_NESTED(66); \
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ld r10,area+EX_CFAR(r13); \
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std r10,ORIG_GPR3(r1); \
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END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
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ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
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mflr r9; /* save LR in stackframe */ \
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std r9,_LINK(r1); \
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mfctr r10; /* save CTR in stackframe */ \
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std r10,_CTR(r1); \
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lbz r10,PACASOFTIRQEN(r13); \
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mfspr r11,SPRN_XER; /* save XER in stackframe */ \
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std r10,SOFTE(r1); \
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std r11,_XER(r1); \
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li r9,(n)+1; \
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std r9,_TRAP(r1); /* set trap number */ \
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li r10,0; \
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ld r11,exception_marker@toc(r2); \
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std r10,RESULT(r1); /* clear regs->result */ \
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std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \
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ACCOUNT_STOLEN_TIME
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/*
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* Exception vectors.
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*/
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#define STD_EXCEPTION_PSERIES(loc, vec, label) \
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. = loc; \
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.globl label##_pSeries; \
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label##_pSeries: \
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HMT_MEDIUM; \
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SET_SCRATCH0(r13); /* save r13 */ \
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EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
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EXC_STD, KVMTEST_PR, vec)
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#define STD_EXCEPTION_HV(loc, vec, label) \
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. = loc; \
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.globl label##_hv; \
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label##_hv: \
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HMT_MEDIUM; \
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SET_SCRATCH0(r13); /* save r13 */ \
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EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
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EXC_HV, KVMTEST, vec)
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#define __SOFTEN_TEST(h) \
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lbz r10,PACASOFTIRQEN(r13); \
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cmpwi r10,0; \
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beq masked_##h##interrupt
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#define _SOFTEN_TEST(h) __SOFTEN_TEST(h)
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#define SOFTEN_TEST_PR(vec) \
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KVMTEST_PR(vec); \
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_SOFTEN_TEST(EXC_STD)
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#define SOFTEN_TEST_HV(vec) \
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KVMTEST(vec); \
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_SOFTEN_TEST(EXC_HV)
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#define SOFTEN_TEST_HV_201(vec) \
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KVMTEST(vec); \
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_SOFTEN_TEST(EXC_STD)
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#define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
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HMT_MEDIUM; \
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SET_SCRATCH0(r13); /* save r13 */ \
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__EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
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EXCEPTION_PROLOG_PSERIES_1(label##_common, h);
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#define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
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__MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
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#define MASKABLE_EXCEPTION_PSERIES(loc, vec, label) \
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. = loc; \
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.globl label##_pSeries; \
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label##_pSeries: \
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_MASKABLE_EXCEPTION_PSERIES(vec, label, \
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EXC_STD, SOFTEN_TEST_PR)
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#define MASKABLE_EXCEPTION_HV(loc, vec, label) \
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. = loc; \
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.globl label##_hv; \
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label##_hv: \
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_MASKABLE_EXCEPTION_PSERIES(vec, label, \
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EXC_HV, SOFTEN_TEST_HV)
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#define DISABLE_INTS \
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li r11,0; \
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stb r11,PACASOFTIRQEN(r13); \
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stb r11,PACAHARDIRQEN(r13); \
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TRACE_DISABLE_INTS
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#define ENABLE_INTS \
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ld r12,_MSR(r1); \
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mfmsr r11; \
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rlwimi r11,r12,0,MSR_EE; \
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mtmsrd r11,1
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#define STD_EXCEPTION_COMMON(trap, label, hdlr) \
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.align 7; \
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.globl label##_common; \
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label##_common: \
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EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
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DISABLE_INTS; \
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bl .save_nvgprs; \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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bl hdlr; \
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b .ret_from_except
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/*
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* Like STD_EXCEPTION_COMMON, but for exceptions that can occur
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* in the idle task and therefore need the special idle handling.
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*/
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#define STD_EXCEPTION_COMMON_IDLE(trap, label, hdlr) \
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.align 7; \
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.globl label##_common; \
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label##_common: \
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EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
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FINISH_NAP; \
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DISABLE_INTS; \
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bl .save_nvgprs; \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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bl hdlr; \
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b .ret_from_except
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#define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \
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.align 7; \
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.globl label##_common; \
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label##_common: \
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EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
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FINISH_NAP; \
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DISABLE_INTS; \
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BEGIN_FTR_SECTION \
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bl .ppc64_runlatch_on; \
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END_FTR_SECTION_IFSET(CPU_FTR_CTRL) \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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bl hdlr; \
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b .ret_from_except_lite
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/*
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* When the idle code in power4_idle puts the CPU into NAP mode,
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* it has to do so in a loop, and relies on the external interrupt
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* and decrementer interrupt entry code to get it out of the loop.
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* It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
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* to signal that it is in the loop and needs help to get out.
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*/
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#ifdef CONFIG_PPC_970_NAP
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#define FINISH_NAP \
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BEGIN_FTR_SECTION \
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clrrdi r11,r1,THREAD_SHIFT; \
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ld r9,TI_LOCAL_FLAGS(r11); \
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andi. r10,r9,_TLF_NAPPING; \
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bnel power4_fixup_nap; \
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END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
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#else
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#define FINISH_NAP
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#endif
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#endif /* _ASM_POWERPC_EXCEPTION_H */
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