651 lines
15 KiB
ArmAsm
651 lines
15 KiB
ArmAsm
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Main entry point for the guest, exception handling.
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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* Authors: Sanjay Lal <sanjayl@kymasys.com>
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*/
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/regdef.h>
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#include <asm/mipsregs.h>
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#include <asm/stackframe.h>
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#include <asm/asm-offsets.h>
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#define _C_LABEL(x) x
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#define MIPSX(name) mips32_ ## name
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#define CALLFRAME_SIZ 32
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/*
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* VECTOR
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* exception vector entrypoint
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*/
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#define VECTOR(x, regmask) \
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.ent _C_LABEL(x),0; \
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EXPORT(x);
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#define VECTOR_END(x) \
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EXPORT(x);
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/* Overload, Danger Will Robinson!! */
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#define PT_HOST_ASID PT_BVADDR
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#define PT_HOST_USERLOCAL PT_EPC
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#define CP0_DDATA_LO $28,3
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/* Resume Flags */
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#define RESUME_FLAG_HOST (1<<1) /* Resume host? */
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#define RESUME_GUEST 0
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#define RESUME_HOST RESUME_FLAG_HOST
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/*
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* __kvm_mips_vcpu_run: entry point to the guest
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* a0: run
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* a1: vcpu
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*/
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.set noreorder
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.set noat
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FEXPORT(__kvm_mips_vcpu_run)
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/* k0/k1 not being used in host kernel context */
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INT_ADDIU k1, sp, -PT_SIZE
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LONG_S $0, PT_R0(k1)
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LONG_S $1, PT_R1(k1)
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LONG_S $2, PT_R2(k1)
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LONG_S $3, PT_R3(k1)
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LONG_S $4, PT_R4(k1)
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LONG_S $5, PT_R5(k1)
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LONG_S $6, PT_R6(k1)
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LONG_S $7, PT_R7(k1)
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LONG_S $8, PT_R8(k1)
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LONG_S $9, PT_R9(k1)
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LONG_S $10, PT_R10(k1)
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LONG_S $11, PT_R11(k1)
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LONG_S $12, PT_R12(k1)
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LONG_S $13, PT_R13(k1)
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LONG_S $14, PT_R14(k1)
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LONG_S $15, PT_R15(k1)
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LONG_S $16, PT_R16(k1)
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LONG_S $17, PT_R17(k1)
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LONG_S $18, PT_R18(k1)
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LONG_S $19, PT_R19(k1)
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LONG_S $20, PT_R20(k1)
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LONG_S $21, PT_R21(k1)
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LONG_S $22, PT_R22(k1)
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LONG_S $23, PT_R23(k1)
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LONG_S $24, PT_R24(k1)
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LONG_S $25, PT_R25(k1)
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/*
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* XXXKYMA k0/k1 not saved, not being used if we got here through
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* an ioctl()
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*/
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LONG_S $28, PT_R28(k1)
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LONG_S $29, PT_R29(k1)
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LONG_S $30, PT_R30(k1)
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LONG_S $31, PT_R31(k1)
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/* Save hi/lo */
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mflo v0
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LONG_S v0, PT_LO(k1)
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mfhi v1
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LONG_S v1, PT_HI(k1)
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/* Save host status */
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mfc0 v0, CP0_STATUS
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LONG_S v0, PT_STATUS(k1)
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/* Save host ASID, shove it into the BVADDR location */
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mfc0 v1, CP0_ENTRYHI
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andi v1, 0xff
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LONG_S v1, PT_HOST_ASID(k1)
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/* Save DDATA_LO, will be used to store pointer to vcpu */
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mfc0 v1, CP0_DDATA_LO
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LONG_S v1, PT_HOST_USERLOCAL(k1)
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/* DDATA_LO has pointer to vcpu */
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mtc0 a1, CP0_DDATA_LO
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/* Offset into vcpu->arch */
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INT_ADDIU k1, a1, VCPU_HOST_ARCH
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/*
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* Save the host stack to VCPU, used for exception processing
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* when we exit from the Guest
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*/
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LONG_S sp, VCPU_HOST_STACK(k1)
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/* Save the kernel gp as well */
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LONG_S gp, VCPU_HOST_GP(k1)
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/*
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* Setup status register for running the guest in UM, interrupts
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* are disabled
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*/
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li k0, (ST0_EXL | KSU_USER | ST0_BEV)
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mtc0 k0, CP0_STATUS
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ehb
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/* load up the new EBASE */
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LONG_L k0, VCPU_GUEST_EBASE(k1)
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mtc0 k0, CP0_EBASE
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/*
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* Now that the new EBASE has been loaded, unset BEV, set
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* interrupt mask as it was but make sure that timer interrupts
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* are enabled
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*/
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li k0, (ST0_EXL | KSU_USER | ST0_IE)
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andi v0, v0, ST0_IM
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or k0, k0, v0
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mtc0 k0, CP0_STATUS
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ehb
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/* Set Guest EPC */
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LONG_L t0, VCPU_PC(k1)
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mtc0 t0, CP0_EPC
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FEXPORT(__kvm_mips_load_asid)
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/* Set the ASID for the Guest Kernel */
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INT_SLL t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */
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/* addresses shift to 0x80000000 */
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bltz t0, 1f /* If kernel */
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INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */
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INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID /* else user */
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1:
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/* t1: contains the base of the ASID array, need to get the cpu id */
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LONG_L t2, TI_CPU($28) /* smp_processor_id */
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INT_SLL t2, t2, 2 /* x4 */
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REG_ADDU t3, t1, t2
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LONG_L k0, (t3)
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andi k0, k0, 0xff
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mtc0 k0, CP0_ENTRYHI
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ehb
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/* Disable RDHWR access */
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mtc0 zero, CP0_HWRENA
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/* Now load up the Guest Context from VCPU */
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LONG_L $1, VCPU_R1(k1)
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LONG_L $2, VCPU_R2(k1)
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LONG_L $3, VCPU_R3(k1)
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LONG_L $4, VCPU_R4(k1)
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LONG_L $5, VCPU_R5(k1)
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LONG_L $6, VCPU_R6(k1)
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LONG_L $7, VCPU_R7(k1)
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LONG_L $8, VCPU_R8(k1)
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LONG_L $9, VCPU_R9(k1)
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LONG_L $10, VCPU_R10(k1)
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LONG_L $11, VCPU_R11(k1)
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LONG_L $12, VCPU_R12(k1)
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LONG_L $13, VCPU_R13(k1)
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LONG_L $14, VCPU_R14(k1)
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LONG_L $15, VCPU_R15(k1)
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LONG_L $16, VCPU_R16(k1)
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LONG_L $17, VCPU_R17(k1)
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LONG_L $18, VCPU_R18(k1)
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LONG_L $19, VCPU_R19(k1)
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LONG_L $20, VCPU_R20(k1)
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LONG_L $21, VCPU_R21(k1)
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LONG_L $22, VCPU_R22(k1)
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LONG_L $23, VCPU_R23(k1)
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LONG_L $24, VCPU_R24(k1)
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LONG_L $25, VCPU_R25(k1)
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/* k0/k1 loaded up later */
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LONG_L $28, VCPU_R28(k1)
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LONG_L $29, VCPU_R29(k1)
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LONG_L $30, VCPU_R30(k1)
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LONG_L $31, VCPU_R31(k1)
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/* Restore hi/lo */
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LONG_L k0, VCPU_LO(k1)
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mtlo k0
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LONG_L k0, VCPU_HI(k1)
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mthi k0
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FEXPORT(__kvm_mips_load_k0k1)
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/* Restore the guest's k0/k1 registers */
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LONG_L k0, VCPU_R26(k1)
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LONG_L k1, VCPU_R27(k1)
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/* Jump to guest */
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eret
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VECTOR(MIPSX(exception), unknown)
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/* Find out what mode we came from and jump to the proper handler. */
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mtc0 k0, CP0_ERROREPC #01: Save guest k0
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ehb #02:
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mfc0 k0, CP0_EBASE #02: Get EBASE
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INT_SRL k0, k0, 10 #03: Get rid of CPUNum
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INT_SLL k0, k0, 10 #04
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LONG_S k1, 0x3000(k0) #05: Save k1 @ offset 0x3000
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INT_ADDIU k0, k0, 0x2000 #06: Exception handler is
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# installed @ offset 0x2000
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j k0 #07: jump to the function
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nop #08: branch delay slot
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VECTOR_END(MIPSX(exceptionEnd))
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.end MIPSX(exception)
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/*
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* Generic Guest exception handler. We end up here when the guest
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* does something that causes a trap to kernel mode.
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*/
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NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra)
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/* Get the VCPU pointer from DDTATA_LO */
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mfc0 k1, CP0_DDATA_LO
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INT_ADDIU k1, k1, VCPU_HOST_ARCH
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/* Start saving Guest context to VCPU */
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LONG_S $0, VCPU_R0(k1)
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LONG_S $1, VCPU_R1(k1)
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LONG_S $2, VCPU_R2(k1)
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LONG_S $3, VCPU_R3(k1)
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LONG_S $4, VCPU_R4(k1)
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LONG_S $5, VCPU_R5(k1)
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LONG_S $6, VCPU_R6(k1)
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LONG_S $7, VCPU_R7(k1)
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LONG_S $8, VCPU_R8(k1)
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LONG_S $9, VCPU_R9(k1)
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LONG_S $10, VCPU_R10(k1)
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LONG_S $11, VCPU_R11(k1)
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LONG_S $12, VCPU_R12(k1)
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LONG_S $13, VCPU_R13(k1)
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LONG_S $14, VCPU_R14(k1)
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LONG_S $15, VCPU_R15(k1)
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LONG_S $16, VCPU_R16(k1)
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LONG_S $17, VCPU_R17(k1)
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LONG_S $18, VCPU_R18(k1)
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LONG_S $19, VCPU_R19(k1)
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LONG_S $20, VCPU_R20(k1)
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LONG_S $21, VCPU_R21(k1)
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LONG_S $22, VCPU_R22(k1)
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LONG_S $23, VCPU_R23(k1)
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LONG_S $24, VCPU_R24(k1)
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LONG_S $25, VCPU_R25(k1)
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/* Guest k0/k1 saved later */
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LONG_S $28, VCPU_R28(k1)
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LONG_S $29, VCPU_R29(k1)
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LONG_S $30, VCPU_R30(k1)
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LONG_S $31, VCPU_R31(k1)
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/* We need to save hi/lo and restore them on the way out */
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mfhi t0
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LONG_S t0, VCPU_HI(k1)
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mflo t0
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LONG_S t0, VCPU_LO(k1)
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/* Finally save guest k0/k1 to VCPU */
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mfc0 t0, CP0_ERROREPC
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LONG_S t0, VCPU_R26(k1)
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/* Get GUEST k1 and save it in VCPU */
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PTR_LI t1, ~0x2ff
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mfc0 t0, CP0_EBASE
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and t0, t0, t1
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LONG_L t0, 0x3000(t0)
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LONG_S t0, VCPU_R27(k1)
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/* Now that context has been saved, we can use other registers */
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/* Restore vcpu */
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mfc0 a1, CP0_DDATA_LO
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move s1, a1
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/* Restore run (vcpu->run) */
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LONG_L a0, VCPU_RUN(a1)
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/* Save pointer to run in s0, will be saved by the compiler */
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move s0, a0
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/*
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* Save Host level EPC, BadVaddr and Cause to VCPU, useful to
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* process the exception
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*/
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mfc0 k0,CP0_EPC
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LONG_S k0, VCPU_PC(k1)
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mfc0 k0, CP0_BADVADDR
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LONG_S k0, VCPU_HOST_CP0_BADVADDR(k1)
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mfc0 k0, CP0_CAUSE
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LONG_S k0, VCPU_HOST_CP0_CAUSE(k1)
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mfc0 k0, CP0_ENTRYHI
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LONG_S k0, VCPU_HOST_ENTRYHI(k1)
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/* Now restore the host state just enough to run the handlers */
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/* Swtich EBASE to the one used by Linux */
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/* load up the host EBASE */
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mfc0 v0, CP0_STATUS
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.set at
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or k0, v0, ST0_BEV
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.set noat
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mtc0 k0, CP0_STATUS
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ehb
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LONG_L k0, VCPU_HOST_EBASE(k1)
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mtc0 k0,CP0_EBASE
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/*
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* If FPU is enabled, save FCR31 and clear it so that later ctc1's don't
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* trigger FPE for pending exceptions.
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*/
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.set at
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and v1, v0, ST0_CU1
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beqz v1, 1f
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nop
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.set push
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SET_HARDFLOAT
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cfc1 t0, fcr31
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sw t0, VCPU_FCR31(k1)
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ctc1 zero,fcr31
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.set pop
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.set noat
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1:
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#ifdef CONFIG_CPU_HAS_MSA
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/*
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* If MSA is enabled, save MSACSR and clear it so that later
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* instructions don't trigger MSAFPE for pending exceptions.
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*/
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mfc0 t0, CP0_CONFIG3
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ext t0, t0, 28, 1 /* MIPS_CONF3_MSAP */
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beqz t0, 1f
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nop
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mfc0 t0, CP0_CONFIG5
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ext t0, t0, 27, 1 /* MIPS_CONF5_MSAEN */
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beqz t0, 1f
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nop
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_cfcmsa t0, MSA_CSR
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sw t0, VCPU_MSA_CSR(k1)
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_ctcmsa MSA_CSR, zero
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1:
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#endif
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/* Now that the new EBASE has been loaded, unset BEV and KSU_USER */
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.set at
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and v0, v0, ~(ST0_EXL | KSU_USER | ST0_IE)
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or v0, v0, ST0_CU0
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.set noat
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mtc0 v0, CP0_STATUS
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ehb
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/* Load up host GP */
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LONG_L gp, VCPU_HOST_GP(k1)
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/* Need a stack before we can jump to "C" */
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LONG_L sp, VCPU_HOST_STACK(k1)
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/* Saved host state */
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INT_ADDIU sp, sp, -PT_SIZE
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/*
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* XXXKYMA do we need to load the host ASID, maybe not because the
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* kernel entries are marked GLOBAL, need to verify
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*/
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/* Restore host DDATA_LO */
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LONG_L k0, PT_HOST_USERLOCAL(sp)
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mtc0 k0, CP0_DDATA_LO
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/* Restore RDHWR access */
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PTR_LI k0, 0x2000000F
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mtc0 k0, CP0_HWRENA
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/* Jump to handler */
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FEXPORT(__kvm_mips_jump_to_handler)
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/*
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* XXXKYMA: not sure if this is safe, how large is the stack??
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* Now jump to the kvm_mips_handle_exit() to see if we can deal
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* with this in the kernel
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*/
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PTR_LA t9, kvm_mips_handle_exit
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jalr.hb t9
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INT_ADDIU sp, sp, -CALLFRAME_SIZ /* BD Slot */
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/* Return from handler Make sure interrupts are disabled */
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di
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ehb
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/*
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* XXXKYMA: k0/k1 could have been blown away if we processed
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* an exception while we were handling the exception from the
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* guest, reload k1
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*/
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move k1, s1
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INT_ADDIU k1, k1, VCPU_HOST_ARCH
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/*
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* Check return value, should tell us if we are returning to the
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* host (handle I/O etc)or resuming the guest
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*/
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andi t0, v0, RESUME_HOST
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bnez t0, __kvm_mips_return_to_host
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nop
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__kvm_mips_return_to_guest:
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/* Put the saved pointer to vcpu (s1) back into the DDATA_LO Register */
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mtc0 s1, CP0_DDATA_LO
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/* Load up the Guest EBASE to minimize the window where BEV is set */
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LONG_L t0, VCPU_GUEST_EBASE(k1)
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/* Switch EBASE back to the one used by KVM */
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mfc0 v1, CP0_STATUS
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.set at
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or k0, v1, ST0_BEV
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.set noat
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mtc0 k0, CP0_STATUS
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ehb
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mtc0 t0, CP0_EBASE
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/* Setup status register for running guest in UM */
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.set at
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or v1, v1, (ST0_EXL | KSU_USER | ST0_IE)
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and v1, v1, ~(ST0_CU0 | ST0_MX)
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.set noat
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mtc0 v1, CP0_STATUS
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ehb
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/* Set Guest EPC */
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LONG_L t0, VCPU_PC(k1)
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mtc0 t0, CP0_EPC
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/* Set the ASID for the Guest Kernel */
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INT_SLL t0, t0, 1 /* with kseg0 @ 0x40000000, kernel */
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/* addresses shift to 0x80000000 */
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bltz t0, 1f /* If kernel */
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INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */
|
|
INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID /* else user */
|
|
1:
|
|
/* t1: contains the base of the ASID array, need to get the cpu id */
|
|
LONG_L t2, TI_CPU($28) /* smp_processor_id */
|
|
INT_SLL t2, t2, 2 /* x4 */
|
|
REG_ADDU t3, t1, t2
|
|
LONG_L k0, (t3)
|
|
andi k0, k0, 0xff
|
|
mtc0 k0,CP0_ENTRYHI
|
|
ehb
|
|
|
|
/* Disable RDHWR access */
|
|
mtc0 zero, CP0_HWRENA
|
|
|
|
/* load the guest context from VCPU and return */
|
|
LONG_L $0, VCPU_R0(k1)
|
|
LONG_L $1, VCPU_R1(k1)
|
|
LONG_L $2, VCPU_R2(k1)
|
|
LONG_L $3, VCPU_R3(k1)
|
|
LONG_L $4, VCPU_R4(k1)
|
|
LONG_L $5, VCPU_R5(k1)
|
|
LONG_L $6, VCPU_R6(k1)
|
|
LONG_L $7, VCPU_R7(k1)
|
|
LONG_L $8, VCPU_R8(k1)
|
|
LONG_L $9, VCPU_R9(k1)
|
|
LONG_L $10, VCPU_R10(k1)
|
|
LONG_L $11, VCPU_R11(k1)
|
|
LONG_L $12, VCPU_R12(k1)
|
|
LONG_L $13, VCPU_R13(k1)
|
|
LONG_L $14, VCPU_R14(k1)
|
|
LONG_L $15, VCPU_R15(k1)
|
|
LONG_L $16, VCPU_R16(k1)
|
|
LONG_L $17, VCPU_R17(k1)
|
|
LONG_L $18, VCPU_R18(k1)
|
|
LONG_L $19, VCPU_R19(k1)
|
|
LONG_L $20, VCPU_R20(k1)
|
|
LONG_L $21, VCPU_R21(k1)
|
|
LONG_L $22, VCPU_R22(k1)
|
|
LONG_L $23, VCPU_R23(k1)
|
|
LONG_L $24, VCPU_R24(k1)
|
|
LONG_L $25, VCPU_R25(k1)
|
|
|
|
/* $/k1 loaded later */
|
|
LONG_L $28, VCPU_R28(k1)
|
|
LONG_L $29, VCPU_R29(k1)
|
|
LONG_L $30, VCPU_R30(k1)
|
|
LONG_L $31, VCPU_R31(k1)
|
|
|
|
FEXPORT(__kvm_mips_skip_guest_restore)
|
|
LONG_L k0, VCPU_HI(k1)
|
|
mthi k0
|
|
|
|
LONG_L k0, VCPU_LO(k1)
|
|
mtlo k0
|
|
|
|
LONG_L k0, VCPU_R26(k1)
|
|
LONG_L k1, VCPU_R27(k1)
|
|
|
|
eret
|
|
|
|
__kvm_mips_return_to_host:
|
|
/* EBASE is already pointing to Linux */
|
|
LONG_L k1, VCPU_HOST_STACK(k1)
|
|
INT_ADDIU k1,k1, -PT_SIZE
|
|
|
|
/* Restore host DDATA_LO */
|
|
LONG_L k0, PT_HOST_USERLOCAL(k1)
|
|
mtc0 k0, CP0_DDATA_LO
|
|
|
|
/* Restore host ASID */
|
|
LONG_L k0, PT_HOST_ASID(sp)
|
|
andi k0, 0xff
|
|
mtc0 k0,CP0_ENTRYHI
|
|
ehb
|
|
|
|
/* Load context saved on the host stack */
|
|
LONG_L $0, PT_R0(k1)
|
|
LONG_L $1, PT_R1(k1)
|
|
|
|
/*
|
|
* r2/v0 is the return code, shift it down by 2 (arithmetic)
|
|
* to recover the err code
|
|
*/
|
|
INT_SRA k0, v0, 2
|
|
move $2, k0
|
|
|
|
LONG_L $3, PT_R3(k1)
|
|
LONG_L $4, PT_R4(k1)
|
|
LONG_L $5, PT_R5(k1)
|
|
LONG_L $6, PT_R6(k1)
|
|
LONG_L $7, PT_R7(k1)
|
|
LONG_L $8, PT_R8(k1)
|
|
LONG_L $9, PT_R9(k1)
|
|
LONG_L $10, PT_R10(k1)
|
|
LONG_L $11, PT_R11(k1)
|
|
LONG_L $12, PT_R12(k1)
|
|
LONG_L $13, PT_R13(k1)
|
|
LONG_L $14, PT_R14(k1)
|
|
LONG_L $15, PT_R15(k1)
|
|
LONG_L $16, PT_R16(k1)
|
|
LONG_L $17, PT_R17(k1)
|
|
LONG_L $18, PT_R18(k1)
|
|
LONG_L $19, PT_R19(k1)
|
|
LONG_L $20, PT_R20(k1)
|
|
LONG_L $21, PT_R21(k1)
|
|
LONG_L $22, PT_R22(k1)
|
|
LONG_L $23, PT_R23(k1)
|
|
LONG_L $24, PT_R24(k1)
|
|
LONG_L $25, PT_R25(k1)
|
|
|
|
/* Host k0/k1 were not saved */
|
|
|
|
LONG_L $28, PT_R28(k1)
|
|
LONG_L $29, PT_R29(k1)
|
|
LONG_L $30, PT_R30(k1)
|
|
|
|
LONG_L k0, PT_HI(k1)
|
|
mthi k0
|
|
|
|
LONG_L k0, PT_LO(k1)
|
|
mtlo k0
|
|
|
|
/* Restore RDHWR access */
|
|
PTR_LI k0, 0x2000000F
|
|
mtc0 k0, CP0_HWRENA
|
|
|
|
/* Restore RA, which is the address we will return to */
|
|
LONG_L ra, PT_R31(k1)
|
|
j ra
|
|
nop
|
|
|
|
VECTOR_END(MIPSX(GuestExceptionEnd))
|
|
.end MIPSX(GuestException)
|
|
|
|
MIPSX(exceptions):
|
|
####
|
|
##### The exception handlers.
|
|
#####
|
|
.word _C_LABEL(MIPSX(GuestException)) # 0
|
|
.word _C_LABEL(MIPSX(GuestException)) # 1
|
|
.word _C_LABEL(MIPSX(GuestException)) # 2
|
|
.word _C_LABEL(MIPSX(GuestException)) # 3
|
|
.word _C_LABEL(MIPSX(GuestException)) # 4
|
|
.word _C_LABEL(MIPSX(GuestException)) # 5
|
|
.word _C_LABEL(MIPSX(GuestException)) # 6
|
|
.word _C_LABEL(MIPSX(GuestException)) # 7
|
|
.word _C_LABEL(MIPSX(GuestException)) # 8
|
|
.word _C_LABEL(MIPSX(GuestException)) # 9
|
|
.word _C_LABEL(MIPSX(GuestException)) # 10
|
|
.word _C_LABEL(MIPSX(GuestException)) # 11
|
|
.word _C_LABEL(MIPSX(GuestException)) # 12
|
|
.word _C_LABEL(MIPSX(GuestException)) # 13
|
|
.word _C_LABEL(MIPSX(GuestException)) # 14
|
|
.word _C_LABEL(MIPSX(GuestException)) # 15
|
|
.word _C_LABEL(MIPSX(GuestException)) # 16
|
|
.word _C_LABEL(MIPSX(GuestException)) # 17
|
|
.word _C_LABEL(MIPSX(GuestException)) # 18
|
|
.word _C_LABEL(MIPSX(GuestException)) # 19
|
|
.word _C_LABEL(MIPSX(GuestException)) # 20
|
|
.word _C_LABEL(MIPSX(GuestException)) # 21
|
|
.word _C_LABEL(MIPSX(GuestException)) # 22
|
|
.word _C_LABEL(MIPSX(GuestException)) # 23
|
|
.word _C_LABEL(MIPSX(GuestException)) # 24
|
|
.word _C_LABEL(MIPSX(GuestException)) # 25
|
|
.word _C_LABEL(MIPSX(GuestException)) # 26
|
|
.word _C_LABEL(MIPSX(GuestException)) # 27
|
|
.word _C_LABEL(MIPSX(GuestException)) # 28
|
|
.word _C_LABEL(MIPSX(GuestException)) # 29
|
|
.word _C_LABEL(MIPSX(GuestException)) # 30
|
|
.word _C_LABEL(MIPSX(GuestException)) # 31
|