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// Copyright 2018 Google LLC
//
// 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.
package usermem
import (
"sync/atomic"
"unsafe"
"gvisor.googlesource.com/gvisor/pkg/atomicbitops"
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
)
// SwapUint32 implements IO.SwapUint32.
func (b *BytesIO) SwapUint32(ctx context.Context, addr Addr, new uint32, opts IOOpts) (uint32, error) {
if _, rngErr := b.rangeCheck(addr, 4); rngErr != nil {
return 0, rngErr
}
return atomic.SwapUint32((*uint32)(unsafe.Pointer(&b.Bytes[int(addr)])), new), nil
}
// CompareAndSwapUint32 implements IO.CompareAndSwapUint32.
func (b *BytesIO) CompareAndSwapUint32(ctx context.Context, addr Addr, old, new uint32, opts IOOpts) (uint32, error) {
if _, rngErr := b.rangeCheck(addr, 4); rngErr != nil {
return 0, rngErr
}
return atomicbitops.CompareAndSwapUint32((*uint32)(unsafe.Pointer(&b.Bytes[int(addr)])), old, new), nil
}
// LoadUint32 implements IO.LoadUint32.
func (b *BytesIO) LoadUint32(ctx context.Context, addr Addr, opts IOOpts) (uint32, error) {
if _, err := b.rangeCheck(addr, 4); err != nil {
return 0, err
}
return atomic.LoadUint32((*uint32)(unsafe.Pointer(&b.Bytes[int(addr)]))), nil
}
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