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