github.com/metacubex/gvisor@v0.0.0-20240320004321-933faba989ec/pkg/sync/race_amd64.s (about)

     1  // Copyright 2020 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  //go:build race && amd64
    16  // +build race,amd64
    17  
    18  #include "textflag.h"
    19  
    20  // func RaceUncheckedAtomicCompareAndSwapUintptr(ptr *uintptr, old, new uintptr) bool
    21  TEXT ·RaceUncheckedAtomicCompareAndSwapUintptr(SB),NOSPLIT|NOFRAME,$0-25
    22  	MOVQ ptr+0(FP), DI
    23  	MOVQ old+8(FP), AX
    24  	MOVQ new+16(FP), SI
    25  
    26  	LOCK
    27  	CMPXCHGQ SI, 0(DI)
    28  
    29  	SETEQ AX
    30  	MOVB AX, ret+24(FP)
    31  
    32  	RET
    33