race_arm64.s raw

   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 && arm64
  16  // +build race,arm64
  17  
  18  #include "textflag.h"
  19  
  20  // func RaceUncheckedAtomicCompareAndSwapUintptr(ptr *uintptr, old, new uintptr) bool
  21  TEXT ·RaceUncheckedAtomicCompareAndSwapUintptr(SB),NOSPLIT,$0-25
  22  	MOVD ptr+0(FP), R0
  23  	MOVD old+8(FP), R1
  24  	MOVD new+16(FP), R1
  25  again:
  26  	LDAXR (R0), R3
  27  	CMP R1, R3
  28  	BNE ok
  29  	STLXR R2, (R0), R3
  30  	CBNZ R3, again
  31  ok:
  32  	CSET EQ, R0
  33  	MOVB R0, ret+24(FP)
  34  	RET
  35  
  36