gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/platform/systrap/lib_amd64.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|NOFRAME,$0
    19  	PAUSE
    20  	RET
    21  
    22  TEXT ·cputicks(SB),NOSPLIT|NOFRAME,$0-8
    23  	LFENCE
    24  	RDTSC
    25  	SHLQ	$32, DX
    26  	ADDQ	DX, AX
    27  	MOVQ	AX, ret+0(FP)
    28  	RET