github.com/MerlinKodo/gvisor@v0.0.0-20231110090155-957f62ecf90e/pkg/ring0/kernel_unsafe.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 ring0
    16  
    17  import (
    18  	"unsafe"
    19  )
    20  
    21  // eface mirrors runtime.eface.
    22  type eface struct {
    23  	typ  uintptr
    24  	data unsafe.Pointer
    25  }
    26  
    27  // kernelAddr returns the kernel virtual address for the given object.
    28  //
    29  //go:nosplit
    30  func kernelAddr(obj any) uintptr {
    31  	e := (*eface)(unsafe.Pointer(&obj))
    32  	return KernelStartAddress | uintptr(e.data)
    33  }
    34  
    35  // kernelFunc returns the address of the given function.
    36  //
    37  //go:nosplit
    38  func kernelFunc(fn uintptr) uintptr {
    39  	return KernelStartAddress | fn
    40  }