github.com/metacubex/gvisor@v0.0.0-20240320004321-933faba989ec/pkg/sentry/platform/systrap/lib_arm64.s (about)

     1  // Copyright 2022 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #include "funcdata.h"
    16  #include "textflag.h"
    17  
    18  TEXT ·spinloop(SB),NOSPLIT,$0
    19  	YIELD
    20  	RET
    21  
    22  TEXT ·cputicks(SB),NOSPLIT,$0-8
    23  	ISB	$15
    24  	WORD	$0xd53be040     //MRS	CNTVCT_EL0, R0
    25  	MOVD	R0, ret+0(FP)
    26  	RET