github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/kernel/syscalls_state.go (about)

     1  // Copyright 2018 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 kernel
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/SagerNet/gvisor/pkg/abi"
    21  	"github.com/SagerNet/gvisor/pkg/sentry/arch"
    22  )
    23  
    24  // syscallTableInfo is used to reload the SyscallTable.
    25  //
    26  // +stateify savable
    27  type syscallTableInfo struct {
    28  	OS   abi.OS
    29  	Arch arch.Arch
    30  }
    31  
    32  // saveSt saves the SyscallTable.
    33  func (image *TaskImage) saveSt() syscallTableInfo {
    34  	return syscallTableInfo{
    35  		OS:   image.st.OS,
    36  		Arch: image.st.Arch,
    37  	}
    38  }
    39  
    40  // loadSt loads the SyscallTable.
    41  func (image *TaskImage) loadSt(sti syscallTableInfo) {
    42  	st, ok := LookupSyscallTable(sti.OS, sti.Arch)
    43  	if !ok {
    44  		panic(fmt.Sprintf("syscall table not found for OS %v, Arch %v", sti.OS, sti.Arch))
    45  	}
    46  	image.st = st // Save the table reference.
    47  }