gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/platform/systrap/sysmsg/sysmsg_arm64.go (about)

     1  // Copyright 2023 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  //go:build arm64
    16  // +build arm64
    17  
    18  package sysmsg
    19  
    20  import (
    21  	_ "embed"
    22  	"fmt"
    23  	"strings"
    24  
    25  	"gvisor.dev/gvisor/pkg/cpuid"
    26  )
    27  
    28  // SighandlerBlob contains the compiled code of the sysmsg signal handler.
    29  //
    30  //go:embed sighandler.built-in.arm64.bin
    31  var SighandlerBlob []byte
    32  
    33  // ArchState defines variables specific to the architecture being
    34  // used.
    35  type ArchState struct {
    36  	fpLen uint32
    37  }
    38  
    39  // Init initializes the arch specific state.
    40  func (s *ArchState) Init() {
    41  	fs := cpuid.HostFeatureSet()
    42  	fpLenUint, _ := fs.ExtendedStateSize()
    43  	s.fpLen = uint32(fpLenUint)
    44  }
    45  
    46  // FpLen returns the FP state length for ARM.
    47  func (s *ArchState) FpLen() int {
    48  	return int(s.fpLen)
    49  }
    50  
    51  func (s *ArchState) String() string {
    52  	var b strings.Builder
    53  	fmt.Fprintf(&b, "sysmsg.ArchState{")
    54  	fmt.Fprintf(&b, " fpLen %d", s.fpLen)
    55  	b.WriteString(" }")
    56  
    57  	return b.String()
    58  }