move mmap funciton into mmap package

mmap_linux_amd64.go → mmap/mmap_linux_amd64.go

@@ -1,6 +1,7 @@
+//go:build linux && amd64
 // +build linux,amd64
 
-package goloader
+package mmap
 
 import (
 	"os"

mmap_unix.go → mmap/mmap_unix.go

@@ -1,6 +1,7 @@
+//go:build darwin || dragonfly || freebsd || (linux && !amd64) || openbsd || solaris || netbsd
 // +build darwin dragonfly freebsd linux,!amd64 openbsd solaris netbsd
 
-package goloader
+package mmap
 
 import (
 	"os"

mmap_windows.go → mmap/mmap_windows.go

@@ -1,13 +1,21 @@
+//go:build windows
 // +build windows
 
-package goloader
+package mmap
 
 import (
 	"os"
 	"syscall"
 	"unsafe"
 )
 
+// See reflect/value.go sliceHeader
+type sliceHeader struct {
+	Data uintptr
+	Len  int
+	Cap  int
+}
+
 func Mmap(size int) ([]byte, error) {
 
 	sizelo := uint32(size >> 32)

utils.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"strconv"
 	"unsafe"
+
+	"github.com/pkujhd/goloader/mmap"
 )
 
 //go:linkname add runtime.add
@@ -98,6 +100,14 @@ func getArch(archName string) *sys.Arch {
 	return arch
 }
 
+func Mmap(size int) ([]byte, error) {
+	return mmap.Mmap(size)
+}
+
+func Munmap(b []byte) (err error) {
+	return mmap.Munmap(b)
+}
+
 //see $GOROOT/src/cmd/internal/loader/loader.go:preprocess
 func ispreprocesssymbol(name string) bool {
 	if len(name) > 5 {