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Konstantin BogomolovandgVisor bot
7d6ecf548a
For now we are going to completely disable using AMX, so we will always subtract extended state size reserved from AMX from the rest of the extended state size, and hardcode the AMX XCR0 bits to be always off. Fixes #9750. PiperOrigin-RevId: 599302059
39 lines
1.0 KiB
ArmAsm
39 lines
1.0 KiB
ArmAsm
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "textflag.h"
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TEXT ·native(SB),NOSPLIT|NOFRAME,$0-24
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MOVL arg_Eax+0(FP), AX
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MOVL arg_Ecx+4(FP), CX
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CPUID
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MOVL AX, ret_Eax+8(FP)
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MOVL BX, ret_Ebx+12(FP)
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MOVL CX, ret_Ecx+16(FP)
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MOVL DX, ret_Edx+20(FP)
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RET
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// xgetbv reads an extended control register.
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//
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// The code corresponds to:
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//
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// xgetbv
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//
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TEXT ·xgetbv(SB),NOSPLIT|NOFRAME,$0-16
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MOVQ reg+0(FP), CX
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BYTE $0x0f; BYTE $0x01; BYTE $0xd0;
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MOVL AX, ret+8(FP)
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MOVL DX, ret+12(FP)
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RET
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