You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
3.0 KiB
112 lines
3.0 KiB
//go:build windows
|
|
// +build windows
|
|
|
|
/*
|
|
* 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 (
|
|
`fmt`
|
|
`os`
|
|
`reflect`
|
|
`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")
|
|
)
|
|
|
|
type Loader []byte
|
|
type Function unsafe.Pointer
|
|
|
|
func (self Loader) Load(fn string, fp int, args int, argPtrs []bool, localPtrs []bool) (f Function) {
|
|
p := os.Getpagesize()
|
|
n := (((len(self) - 1) / p) + 1) * p
|
|
|
|
/* register the function */
|
|
m := mmap(n)
|
|
v := fmt.Sprintf("runtime.__%s_%x", fn, m)
|
|
|
|
registerFunction(v, m, uintptr(n), fp, args, uintptr(len(self)), argPtrs, localPtrs)
|
|
|
|
/* reference as a slice */
|
|
s := *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader {
|
|
Data : m,
|
|
Cap : n,
|
|
Len : len(self),
|
|
}))
|
|
|
|
/* copy the machine code, and make it executable */
|
|
copy(s, self)
|
|
mprotect(m, n)
|
|
return Function(&m)
|
|
}
|
|
|
|
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
|
|
}
|