diff options
Diffstat (limited to 'pkg/sleep/commit_arm64.s')
| -rw-r--r-- | pkg/sleep/commit_arm64.s | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/pkg/sleep/commit_arm64.s b/pkg/sleep/commit_arm64.s new file mode 100644 index 000000000..d0ef15b20 --- /dev/null +++ b/pkg/sleep/commit_arm64.s @@ -0,0 +1,38 @@ +// Copyright 2019 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. + +#include "textflag.h" + +#define preparingG 1 + +// See commit_noasm.go for a description of commitSleep. +// +// func commitSleep(g uintptr, waitingG *uintptr) bool +TEXT ·commitSleep(SB),NOSPLIT,$0-24 + MOVD waitingG+8(FP), R0 + MOVD $preparingG, R1 + MOVD G+0(FP), R2 + + // Store the G in waitingG if it's still preparingG. If it's anything + // else it means a waker has aborted the sleep. +again: + LDAXR (R0), R3 + CMP R1, R3 + BNE ok + STLXR R2, (R0), R3 + CBNZ R3, again +ok: + CSET EQ, R0 + MOVB R0, ret+16(FP) + RET |