gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/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  	"context"
    19  	"fmt"
    20  
    21  	"gvisor.dev/gvisor/pkg/abi"
    22  	"gvisor.dev/gvisor/pkg/sentry/arch"
    23  )
    24  
    25  // syscallTableInfo is used to reload the SyscallTable.
    26  //
    27  // +stateify savable
    28  type syscallTableInfo struct {
    29  	OS   abi.OS
    30  	Arch arch.Arch
    31  }
    32  
    33  // saveSt saves the SyscallTable.
    34  func (image *TaskImage) saveSt() syscallTableInfo {
    35  	return syscallTableInfo{
    36  		OS:   image.st.OS,
    37  		Arch: image.st.Arch,
    38  	}
    39  }
    40  
    41  // loadSt loads the SyscallTable.
    42  func (image *TaskImage) loadSt(_ context.Context, sti syscallTableInfo) {
    43  	st, ok := LookupSyscallTable(sti.OS, sti.Arch)
    44  	if !ok {
    45  		panic(fmt.Sprintf("syscall table not found for OS %v, Arch %v", sti.OS, sti.Arch))
    46  	}
    47  	image.st = st // Save the table reference.
    48  }