mirror of https://go.googlesource.com/go
128 lines
3.5 KiB
Go
128 lines
3.5 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build ignore
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// Generate Windows callback assembly file.
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package main
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import (
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"bytes"
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"fmt"
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"os"
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)
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const maxCallback = 2000
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func genasm386Amd64() {
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var buf bytes.Buffer
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buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
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//go:build 386 || amd64
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#include "textflag.h"
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// runtime·callbackasm is called by external code to
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// execute Go implemented callback function. It is not
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// called from the start, instead runtime·compilecallback
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// always returns address into runtime·callbackasm offset
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// appropriately so different callbacks start with different
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// CALL instruction in runtime·callbackasm. This determines
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// which Go callback function is executed later on.
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TEXT runtime·callbackasm(SB),NOSPLIT|NOFRAME,$0
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`)
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for i := 0; i < maxCallback; i++ {
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buf.WriteString("\tCALL\truntime·callbackasm1(SB)\n")
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}
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filename := fmt.Sprintf("zcallback_windows.s")
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err := os.WriteFile(filename, buf.Bytes(), 0666)
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if err != nil {
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fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
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os.Exit(2)
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}
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}
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func genasmArm() {
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var buf bytes.Buffer
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buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
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// External code calls into callbackasm at an offset corresponding
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// to the callback index. Callbackasm is a table of MOV and B instructions.
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// The MOV instruction loads R12 with the callback index, and the
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// B instruction branches to callbackasm1.
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// callbackasm1 takes the callback index from R12 and
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// indexes into an array that stores information about each callback.
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// It then calls the Go implementation for that callback.
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#include "textflag.h"
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TEXT runtime·callbackasm(SB),NOSPLIT|NOFRAME,$0
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`)
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for i := 0; i < maxCallback; i++ {
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fmt.Fprintf(&buf, "\tMOVW\t$%d, R12\n", i)
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buf.WriteString("\tB\truntime·callbackasm1(SB)\n")
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}
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err := os.WriteFile("zcallback_windows_arm.s", buf.Bytes(), 0666)
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if err != nil {
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fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
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os.Exit(2)
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}
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}
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func genasmArm64() {
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var buf bytes.Buffer
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buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
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// External code calls into callbackasm at an offset corresponding
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// to the callback index. Callbackasm is a table of MOV and B instructions.
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// The MOV instruction loads R12 with the callback index, and the
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// B instruction branches to callbackasm1.
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// callbackasm1 takes the callback index from R12 and
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// indexes into an array that stores information about each callback.
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// It then calls the Go implementation for that callback.
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#include "textflag.h"
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TEXT runtime·callbackasm(SB),NOSPLIT|NOFRAME,$0
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`)
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for i := 0; i < maxCallback; i++ {
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fmt.Fprintf(&buf, "\tMOVD\t$%d, R12\n", i)
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buf.WriteString("\tB\truntime·callbackasm1(SB)\n")
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}
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err := os.WriteFile("zcallback_windows_arm64.s", buf.Bytes(), 0666)
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if err != nil {
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fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
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os.Exit(2)
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}
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}
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func gengo() {
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var buf bytes.Buffer
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fmt.Fprintf(&buf, `// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
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package runtime
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const cb_max = %d // maximum number of windows callbacks allowed
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`, maxCallback)
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err := os.WriteFile("zcallback_windows.go", buf.Bytes(), 0666)
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if err != nil {
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fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
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os.Exit(2)
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}
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}
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func main() {
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genasm386Amd64()
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genasmArm()
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genasmArm64()
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gengo()
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}
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