forked from mirrors/gotosocial
111 lines
3 KiB
Go
111 lines
3 KiB
Go
//go:build windows
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// +build windows
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/*
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* Copyright 2021 ByteDance Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package loader
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import (
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`fmt`
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`os`
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`reflect`
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`syscall`
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`unsafe`
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)
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const (
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MEM_COMMIT = 0x00001000
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MEM_RESERVE = 0x00002000
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)
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var (
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libKernel32 = syscall.NewLazyDLL("KERNEL32.DLL")
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libKernel32_VirtualAlloc = libKernel32.NewProc("VirtualAlloc")
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libKernel32_VirtualProtect = libKernel32.NewProc("VirtualProtect")
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)
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type Loader []byte
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type Function unsafe.Pointer
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func (self Loader) Load(fn string, fp int, args int, argPtrs []bool, localPtrs []bool) (f Function) {
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p := os.Getpagesize()
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n := (((len(self) - 1) / p) + 1) * p
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/* register the function */
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m := mmap(n)
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v := fmt.Sprintf("runtime.__%s_%x", fn, m)
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registerFunction(v, m, uintptr(n), fp, args, uintptr(len(self)), argPtrs, localPtrs)
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/* reference as a slice */
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s := *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader {
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Data : m,
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Cap : n,
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Len : len(self),
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}))
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/* copy the machine code, and make it executable */
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copy(s, self)
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mprotect(m, n)
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return Function(&m)
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}
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func mmap(nb int) uintptr {
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addr, err := winapi_VirtualAlloc(0, nb, MEM_COMMIT|MEM_RESERVE, syscall.PAGE_READWRITE)
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if err != nil {
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panic(err)
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}
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return addr
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}
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func mprotect(p uintptr, nb int) (oldProtect int) {
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err := winapi_VirtualProtect(p, nb, syscall.PAGE_EXECUTE_READ, &oldProtect)
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if err != nil {
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panic(err)
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}
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return
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}
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// winapi_VirtualAlloc allocate memory
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// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc
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func winapi_VirtualAlloc(lpAddr uintptr, dwSize int, flAllocationType int, flProtect int) (uintptr, error) {
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r1, _, err := libKernel32_VirtualAlloc.Call(
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lpAddr,
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uintptr(dwSize),
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uintptr(flAllocationType),
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uintptr(flProtect),
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)
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if r1 == 0 {
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return 0, err
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}
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return r1, nil
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}
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// winapi_VirtualProtect change memory protection
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// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualprotect
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func winapi_VirtualProtect(lpAddr uintptr, dwSize int, flNewProtect int, lpflOldProtect *int) error {
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r1, _, err := libKernel32_VirtualProtect.Call(
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lpAddr,
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uintptr(dwSize),
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uintptr(flNewProtect),
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uintptr(unsafe.Pointer(lpflOldProtect)),
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)
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if r1 == 0 {
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return err
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}
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return nil
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}
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