| // Copyright 2020 The gVisor Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // +build race |
| // +build arm64 |
| |
| #include "textflag.h" |
| |
| // func RaceUncheckedAtomicCompareAndSwapUintptr(ptr *uintptr, old, new uintptr) bool |
| TEXT ·RaceUncheckedAtomicCompareAndSwapUintptr(SB),NOSPLIT,$0-25 |
| MOVD ptr+0(FP), R0 |
| MOVD old+8(FP), R1 |
| MOVD new+16(FP), R1 |
| again: |
| LDAXR (R0), R3 |
| CMP R1, R3 |
| BNE ok |
| STLXR R2, (R0), R3 |
| CBNZ R3, again |
| ok: |
| CSET EQ, R0 |
| MOVB R0, ret+24(FP) |
| RET |
| |
