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//go:build windows
// +build windows
// build
/*
* Copyright 2021 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package loader
import (
`syscall`
`unsafe`
)
const (
MEM_COMMIT = 0x00001000
MEM_RESERVE = 0x00002000
)
var (
libKernel32 = syscall.NewLazyDLL("KERNEL32.DLL")
libKernel32_VirtualAlloc = libKernel32.NewProc("VirtualAlloc")
libKernel32_VirtualProtect = libKernel32.NewProc("VirtualProtect")
)
func mmap(nb int) uintptr {
addr, err := winapi_VirtualAlloc(0, nb, MEM_COMMIT|MEM_RESERVE, syscall.PAGE_READWRITE)
if err != nil {
panic(err)
}
return addr
}
func mprotect(p uintptr, nb int) (oldProtect int) {
err := winapi_VirtualProtect(p, nb, syscall.PAGE_EXECUTE_READ, &oldProtect)
if err != nil {
panic(err)
}
return
}
// winapi_VirtualAlloc allocate memory
// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc
func winapi_VirtualAlloc(lpAddr uintptr, dwSize int, flAllocationType int, flProtect int) (uintptr, error) {
r1, _, err := libKernel32_VirtualAlloc.Call(
lpAddr,
uintptr(dwSize),
uintptr(flAllocationType),
uintptr(flProtect),
)
if r1 == 0 {
return 0, err
}
return r1, nil
}
// winapi_VirtualProtect change memory protection
// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualprotect
func winapi_VirtualProtect(lpAddr uintptr, dwSize int, flNewProtect int, lpflOldProtect *int) error {
r1, _, err := libKernel32_VirtualProtect.Call(
lpAddr,
uintptr(dwSize),
uintptr(flNewProtect),
uintptr(unsafe.Pointer(lpflOldProtect)),
)
if r1 == 0 {
return err
}
return nil
}
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