forked from Minki/linux
d14740fed8
__kvm_save_fpu and __kvm_restore_fpu use .set mips64r2 so that they can access the odd FPU registers as well as the even, however this causes misassembly of the return instruction on MIPSr6. Fix by replacing .set mips64r2 with .set fp=64, which doesn't change the architecture revision. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim KrÄmář <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
126 lines
3.0 KiB
ArmAsm
126 lines
3.0 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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* FPU context handling code for KVM.
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*
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* Copyright (C) 2015 Imagination Technologies Ltd.
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*/
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#include <asm/asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/fpregdef.h>
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#include <asm/mipsregs.h>
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#include <asm/regdef.h>
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/* preprocessor replaces the fp in ".set fp=64" with $30 otherwise */
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#undef fp
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.set noreorder
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.set noat
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LEAF(__kvm_save_fpu)
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.set push
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SET_HARDFLOAT
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.set fp=64
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mfc0 t0, CP0_STATUS
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sll t0, t0, 5 # is Status.FR set?
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bgez t0, 1f # no: skip odd doubles
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nop
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sdc1 $f1, VCPU_FPR1(a0)
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sdc1 $f3, VCPU_FPR3(a0)
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sdc1 $f5, VCPU_FPR5(a0)
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sdc1 $f7, VCPU_FPR7(a0)
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sdc1 $f9, VCPU_FPR9(a0)
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sdc1 $f11, VCPU_FPR11(a0)
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sdc1 $f13, VCPU_FPR13(a0)
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sdc1 $f15, VCPU_FPR15(a0)
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sdc1 $f17, VCPU_FPR17(a0)
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sdc1 $f19, VCPU_FPR19(a0)
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sdc1 $f21, VCPU_FPR21(a0)
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sdc1 $f23, VCPU_FPR23(a0)
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sdc1 $f25, VCPU_FPR25(a0)
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sdc1 $f27, VCPU_FPR27(a0)
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sdc1 $f29, VCPU_FPR29(a0)
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sdc1 $f31, VCPU_FPR31(a0)
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1: sdc1 $f0, VCPU_FPR0(a0)
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sdc1 $f2, VCPU_FPR2(a0)
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sdc1 $f4, VCPU_FPR4(a0)
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sdc1 $f6, VCPU_FPR6(a0)
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sdc1 $f8, VCPU_FPR8(a0)
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sdc1 $f10, VCPU_FPR10(a0)
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sdc1 $f12, VCPU_FPR12(a0)
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sdc1 $f14, VCPU_FPR14(a0)
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sdc1 $f16, VCPU_FPR16(a0)
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sdc1 $f18, VCPU_FPR18(a0)
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sdc1 $f20, VCPU_FPR20(a0)
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sdc1 $f22, VCPU_FPR22(a0)
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sdc1 $f24, VCPU_FPR24(a0)
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sdc1 $f26, VCPU_FPR26(a0)
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sdc1 $f28, VCPU_FPR28(a0)
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jr ra
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sdc1 $f30, VCPU_FPR30(a0)
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.set pop
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END(__kvm_save_fpu)
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LEAF(__kvm_restore_fpu)
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.set push
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SET_HARDFLOAT
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.set fp=64
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mfc0 t0, CP0_STATUS
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sll t0, t0, 5 # is Status.FR set?
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bgez t0, 1f # no: skip odd doubles
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nop
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ldc1 $f1, VCPU_FPR1(a0)
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ldc1 $f3, VCPU_FPR3(a0)
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ldc1 $f5, VCPU_FPR5(a0)
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ldc1 $f7, VCPU_FPR7(a0)
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ldc1 $f9, VCPU_FPR9(a0)
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ldc1 $f11, VCPU_FPR11(a0)
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ldc1 $f13, VCPU_FPR13(a0)
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ldc1 $f15, VCPU_FPR15(a0)
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ldc1 $f17, VCPU_FPR17(a0)
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ldc1 $f19, VCPU_FPR19(a0)
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ldc1 $f21, VCPU_FPR21(a0)
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ldc1 $f23, VCPU_FPR23(a0)
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ldc1 $f25, VCPU_FPR25(a0)
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ldc1 $f27, VCPU_FPR27(a0)
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ldc1 $f29, VCPU_FPR29(a0)
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ldc1 $f31, VCPU_FPR31(a0)
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1: ldc1 $f0, VCPU_FPR0(a0)
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ldc1 $f2, VCPU_FPR2(a0)
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ldc1 $f4, VCPU_FPR4(a0)
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ldc1 $f6, VCPU_FPR6(a0)
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ldc1 $f8, VCPU_FPR8(a0)
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ldc1 $f10, VCPU_FPR10(a0)
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ldc1 $f12, VCPU_FPR12(a0)
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ldc1 $f14, VCPU_FPR14(a0)
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ldc1 $f16, VCPU_FPR16(a0)
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ldc1 $f18, VCPU_FPR18(a0)
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ldc1 $f20, VCPU_FPR20(a0)
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ldc1 $f22, VCPU_FPR22(a0)
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ldc1 $f24, VCPU_FPR24(a0)
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ldc1 $f26, VCPU_FPR26(a0)
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ldc1 $f28, VCPU_FPR28(a0)
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jr ra
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ldc1 $f30, VCPU_FPR30(a0)
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.set pop
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END(__kvm_restore_fpu)
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LEAF(__kvm_restore_fcsr)
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.set push
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SET_HARDFLOAT
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lw t0, VCPU_FCR31(a0)
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/*
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* The ctc1 must stay at this offset in __kvm_restore_fcsr.
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* See kvm_mips_csr_die_notify() which handles t0 containing a value
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* which triggers an FP Exception, which must be stepped over and
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* ignored since the set cause bits must remain there for the guest.
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*/
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ctc1 t0, fcr31
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jr ra
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nop
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.set pop
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END(__kvm_restore_fcsr)
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