gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/arch/fpu/fpu.go (about)

     1  // Copyright 2021 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Package fpu provides basic floating point helpers.
    16  package fpu
    17  
    18  import (
    19  	"fmt"
    20  )
    21  
    22  // State represents floating point state.
    23  //
    24  // This is a simple byte slice, but may have architecture-specific methods
    25  // attached to it.
    26  type State []byte
    27  
    28  // ErrLoadingState indicates a failed restore due to unusable floating point
    29  // state.
    30  type ErrLoadingState struct {
    31  	// supported is the supported floating point state.
    32  	supportedFeatures uint64
    33  
    34  	// saved is the saved floating point state.
    35  	savedFeatures uint64
    36  }
    37  
    38  // Error returns a sensible description of the restore error.
    39  func (e ErrLoadingState) Error() string {
    40  	return fmt.Sprintf("floating point state contains unsupported features; supported: %#x saved: %#x", e.supportedFeatures, e.savedFeatures)
    41  }