32 lines
1.1 KiB
Go
32 lines
1.1 KiB
Go
// Copyright 2018 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.
|
|
|
|
package arch
|
|
|
|
import (
|
|
"reflect"
|
|
)
|
|
|
|
// alignedBytes returns a slice of size bytes, aligned in memory to the given
|
|
// alignment. This is used because we require certain structures to be aligned
|
|
// in a specific way (for example, the X86 floating point data).
|
|
func alignedBytes(size, alignment uint) []byte {
|
|
data := make([]byte, size+alignment-1)
|
|
offset := uint(reflect.ValueOf(data).Index(0).Addr().Pointer() % uintptr(alignment))
|
|
if offset == 0 {
|
|
return data[:size:size]
|
|
}
|
|
return data[alignment-offset:][:size:size]
|
|
}
|