// Copyright 2014 The Go Authors. All rights reserved.
|
// Use of this source code is governed by a BSD-style
|
// license that can be found in the LICENSE file.
|
|
// +build ignore
|
|
// Generate Windows callback assembly file.
|
|
package main
|
|
import (
|
"bytes"
|
"fmt"
|
"io/ioutil"
|
"os"
|
)
|
|
const maxCallback = 2000
|
|
func genasm386Amd64() {
|
var buf bytes.Buffer
|
|
buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
|
|
// +build 386 amd64
|
// runtime·callbackasm is called by external code to
|
// execute Go implemented callback function. It is not
|
// called from the start, instead runtime·compilecallback
|
// always returns address into runtime·callbackasm offset
|
// appropriately so different callbacks start with different
|
// CALL instruction in runtime·callbackasm. This determines
|
// which Go callback function is executed later on.
|
|
TEXT runtime·callbackasm(SB),7,$0
|
`)
|
for i := 0; i < maxCallback; i++ {
|
buf.WriteString("\tCALL\truntime·callbackasm1(SB)\n")
|
}
|
|
filename := fmt.Sprintf("zcallback_windows.s")
|
err := ioutil.WriteFile(filename, buf.Bytes(), 0666)
|
if err != nil {
|
fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
|
os.Exit(2)
|
}
|
}
|
|
func genasmArm() {
|
var buf bytes.Buffer
|
|
buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
|
|
// External code calls into callbackasm at an offset corresponding
|
// to the callback index. Callbackasm is a table of MOV and B instructions.
|
// The MOV instruction loads R12 with the callback index, and the
|
// B instruction branches to callbackasm1.
|
// callbackasm1 takes the callback index from R12 and
|
// indexes into an array that stores information about each callback.
|
// It then calls the Go implementation for that callback.
|
#include "textflag.h"
|
|
TEXT runtime·callbackasm(SB),NOSPLIT|NOFRAME,$0
|
`)
|
for i := 0; i < maxCallback; i++ {
|
buf.WriteString(fmt.Sprintf("\tMOVW\t$%d, R12\n", i))
|
buf.WriteString("\tB\truntime·callbackasm1(SB)\n")
|
}
|
|
err := ioutil.WriteFile("zcallback_windows_arm.s", buf.Bytes(), 0666)
|
if err != nil {
|
fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
|
os.Exit(2)
|
}
|
}
|
|
func gengo() {
|
var buf bytes.Buffer
|
|
buf.WriteString(fmt.Sprintf(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
|
|
package runtime
|
|
const cb_max = %d // maximum number of windows callbacks allowed
|
`, maxCallback))
|
err := ioutil.WriteFile("zcallback_windows.go", buf.Bytes(), 0666)
|
if err != nil {
|
fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
|
os.Exit(2)
|
}
|
}
|
|
func main() {
|
genasm386Amd64()
|
genasmArm()
|
gengo()
|
}
|
