mmap_windows.go

Documentation: github.com/bytedance/sonic/loader

     1  //go:build windows
     2  // +build windows
     3  
     4  // build
     5  
     6  /*
     7   * Copyright 2021 ByteDance Inc.
     8   *
     9   * Licensed under the Apache License, Version 2.0 (the "License");
    10   * you may not use this file except in compliance with the License.
    11   * You may obtain a copy of the License at
    12   *
    13   *     http://www.apache.org/licenses/LICENSE-2.0
    14   *
    15   * Unless required by applicable law or agreed to in writing, software
    16   * distributed under the License is distributed on an "AS IS" BASIS,
    17   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    18   * See the License for the specific language governing permissions and
    19   * limitations under the License.
    20   */
    21  
    22  package loader
    23  
    24  import (
    25      `syscall`
    26      `unsafe`
    27  )
    28  
    29  const (
    30      MEM_COMMIT  = 0x00001000
    31      MEM_RESERVE = 0x00002000
    32  )
    33  
    34  var (
    35      libKernel32                = syscall.NewLazyDLL("KERNEL32.DLL")
    36      libKernel32_VirtualAlloc   = libKernel32.NewProc("VirtualAlloc")
    37      libKernel32_VirtualProtect = libKernel32.NewProc("VirtualProtect")
    38  )
    39  
    40  func mmap(nb int) uintptr {
    41      addr, err := winapi_VirtualAlloc(0, nb, MEM_COMMIT|MEM_RESERVE, syscall.PAGE_READWRITE)
    42      if err != nil {
    43          panic(err)
    44      }
    45      return addr
    46  }
    47  
    48  func mprotect(p uintptr, nb int) (oldProtect int) {
    49      err := winapi_VirtualProtect(p, nb, syscall.PAGE_EXECUTE_READ, &oldProtect)
    50      if err != nil {
    51          panic(err)
    52      }
    53      return
    54  }
    55  
    56  // winapi_VirtualAlloc allocate memory
    57  // Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc
    58  func winapi_VirtualAlloc(lpAddr uintptr, dwSize int, flAllocationType int, flProtect int) (uintptr, error) {
    59      r1, _, err := libKernel32_VirtualAlloc.Call(
    60          lpAddr,
    61          uintptr(dwSize),
    62          uintptr(flAllocationType),
    63          uintptr(flProtect),
    64      )
    65      if r1 == 0 {
    66          return 0, err
    67      }
    68      return r1, nil
    69  }
    70  
    71  // winapi_VirtualProtect change memory protection
    72  // Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualprotect
    73  func winapi_VirtualProtect(lpAddr uintptr, dwSize int, flNewProtect int, lpflOldProtect *int) error {
    74      r1, _, err := libKernel32_VirtualProtect.Call(
    75          lpAddr,
    76          uintptr(dwSize),
    77          uintptr(flNewProtect),
    78          uintptr(unsafe.Pointer(lpflOldProtect)),
    79      )
    80      if r1 == 0 {
    81          return err
    82      }
    83      return nil
    84  }
    85
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