purego: add wincallback.go (#337)

zcallback_amd64.s and zcallback_arm64.s were generated by wincallback.go
in the Go repository. To keep the reproducible repository states,
add wincallback.go with some modifications.

commit: 0788778a755621f016b1087d6d6e81be85a784dc
author: Hajime Hoshi · 13mo ago · 2025-09-15 04:26 UTC
committer: GitHub · 13mo ago · 2025-09-15 04:26 UTC
parent: 77ed153
signature: GPG UnverifiedB5690EEEBB952194 The key is unknown

5 files · +6087 -6002

M README.md +1 -0


@@ -84,6 +84,7 @@ License that can be found [in the Go Source](https://github.com/golang/go/blob/m
84	84		This is a list of the copied files:
85	85
86	86		* `abi_*.h` from package `runtime/cgo`
	87	+	* `wincallback.go` from package `runtime`
87	88		* `zcallback_darwin_*.s` from package `runtime`
88	89		* `internal/fakecgo/abi_*.h` from package `runtime/cgo`
89	90		* `internal/fakecgo/asm_GOARCH.s` from package `runtime/cgo`


@@ -84,6 +84,7 @@ License that can be found [in the Go Source](https://github.com/golang/go/blob/m
84	This is a list of the copied files:	84		This is a list of the copied files:
85		85
86	* `abi_*.h` from package `runtime/cgo`	86		* `abi_*.h` from package `runtime/cgo`
		87	+	* `wincallback.go` from package `runtime`
87	* `zcallback_darwin_*.s` from package `runtime`	88		* `zcallback_darwin_*.s` from package `runtime`
88	* `internal/fakecgo/abi_*.h` from package `runtime/cgo`	89		* `internal/fakecgo/abi_*.h` from package `runtime/cgo`
89	* `internal/fakecgo/asm_GOARCH.s` from package `runtime/cgo`	90		* `internal/fakecgo/asm_GOARCH.s` from package `runtime/cgo`

A gen.go +6 -0

@@ -0,0 +1,6 @@
	1	+	// SPDX-License-Identifier: Apache-2.0
	2	+	// SPDX-FileCopyrightText: 2025 The Ebitengine Authors
	3	+
	4	+	package purego
	5	+
	6	+	//go:generate go run wincallback.go

@@ -0,0 +1,6 @@
	1	+	// SPDX-License-Identifier: Apache-2.0
	2	+	// SPDX-FileCopyrightText: 2025 The Ebitengine Authors
	3	+
	4	+	package purego
	5	+
	6	+	//go:generate go run wincallback.go

A wincallback.go +78 -0

@@ -0,0 +1,78 @@
	1	+	// Copyright 2014 The Go Authors. All rights reserved.
	2	+	// Use of this source code is governed by a BSD-style
	3	+	// license that can be found in the LICENSE file.
	4	+
	5	+	//go:build ignore
	6	+
	7	+	// Generate Windows callback assembly file.
	8	+	// This was copied from the Go repository and modified to generate non-Windows assembly files.
	9	+
	10	+	package main
	11	+
	12	+	import (
	13	+	"bytes"
	14	+	"fmt"
	15	+	"os"
	16	+	)
	17	+
	18	+	const maxCallback = 2000
	19	+
	20	+	func genasmAmd64() {
	21	+	var buf bytes.Buffer
	22	+
	23	+	buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
	24	+
	25	+	//go:build darwin \|\| freebsd \|\| linux \|\| netbsd
	26	+
	27	+	// runtime·callbackasm is called by external code to
	28	+	// execute Go implemented callback function. It is not
	29	+	// called from the start, instead runtime·compilecallback
	30	+	// always returns address into runtime·callbackasm offset
	31	+	// appropriately so different callbacks start with different
	32	+	// CALL instruction in runtime·callbackasm. This determines
	33	+	// which Go callback function is executed later on.
	34	+	#include "textflag.h"
	35	+
	36	+	TEXT callbackasm(SB),NOSPLIT\|NOFRAME,$0
	37	+	`)
	38	+	for i := 0; i < maxCallback; i++ {
	39	+	buf.WriteString("\tCALL\tcallbackasm1(SB)\n")
	40	+	}
	41	+	if err := os.WriteFile("zcallback_amd64.s", buf.Bytes(), 0644); err != nil {
	42	+	fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
	43	+	os.Exit(2)
	44	+	}
	45	+	}
	46	+
	47	+	func genasmArm64() {
	48	+	var buf bytes.Buffer
	49	+
	50	+	buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
	51	+
	52	+	//go:build darwin \|\| freebsd \|\| linux \|\| netbsd
	53	+
	54	+	// External code calls into callbackasm at an offset corresponding
	55	+	// to the callback index. Callbackasm is a table of MOV and B instructions.
	56	+	// The MOV instruction loads R12 with the callback index, and the
	57	+	// B instruction branches to callbackasm1.
	58	+	// callbackasm1 takes the callback index from R12 and
	59	+	// indexes into an array that stores information about each callback.
	60	+	// It then calls the Go implementation for that callback.
	61	+	#include "textflag.h"
	62	+
	63	+	TEXT callbackasm(SB),NOSPLIT\|NOFRAME,$0
	64	+	`)
	65	+	for i := 0; i < maxCallback; i++ {
	66	+	fmt.Fprintf(&buf, "\tMOVD\t$%d, R12\n", i)
	67	+	buf.WriteString("\tB\tcallbackasm1(SB)\n")
	68	+	}
	69	+	if err := os.WriteFile("zcallback_arm64.s", buf.Bytes(), 0644); err != nil {
	70	+	fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
	71	+	os.Exit(2)
	72	+	}
	73	+	}
	74	+
	75	+	func main() {
	76	+	genasmAmd64()
	77	+	genasmArm64()
	78	+	}

@@ -0,0 +1,78 @@
	1	+	// Copyright 2014 The Go Authors. All rights reserved.
	2	+	// Use of this source code is governed by a BSD-style
	3	+	// license that can be found in the LICENSE file.
	4	+
	5	+	//go:build ignore
	6	+
	7	+	// Generate Windows callback assembly file.
	8	+	// This was copied from the Go repository and modified to generate non-Windows assembly files.
	9	+
	10	+	package main
	11	+
	12	+	import (
	13	+	"bytes"
	14	+	"fmt"
	15	+	"os"
	16	+	)
	17	+
	18	+	const maxCallback = 2000
	19	+
	20	+	func genasmAmd64() {
	21	+	var buf bytes.Buffer
	22	+
	23	+	buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
	24	+
	25	+	//go:build darwin \|\| freebsd \|\| linux \|\| netbsd
	26	+
	27	+	// runtime·callbackasm is called by external code to
	28	+	// execute Go implemented callback function. It is not
	29	+	// called from the start, instead runtime·compilecallback
	30	+	// always returns address into runtime·callbackasm offset
	31	+	// appropriately so different callbacks start with different
	32	+	// CALL instruction in runtime·callbackasm. This determines
	33	+	// which Go callback function is executed later on.
	34	+	#include "textflag.h"
	35	+
	36	+	TEXT callbackasm(SB),NOSPLIT\|NOFRAME,$0
	37	+	`)
	38	+	for i := 0; i < maxCallback; i++ {
	39	+	buf.WriteString("\tCALL\tcallbackasm1(SB)\n")
	40	+	}
	41	+	if err := os.WriteFile("zcallback_amd64.s", buf.Bytes(), 0644); err != nil {
	42	+	fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
	43	+	os.Exit(2)
	44	+	}
	45	+	}
	46	+
	47	+	func genasmArm64() {
	48	+	var buf bytes.Buffer
	49	+
	50	+	buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
	51	+
	52	+	//go:build darwin \|\| freebsd \|\| linux \|\| netbsd
	53	+
	54	+	// External code calls into callbackasm at an offset corresponding
	55	+	// to the callback index. Callbackasm is a table of MOV and B instructions.
	56	+	// The MOV instruction loads R12 with the callback index, and the
	57	+	// B instruction branches to callbackasm1.
	58	+	// callbackasm1 takes the callback index from R12 and
	59	+	// indexes into an array that stores information about each callback.
	60	+	// It then calls the Go implementation for that callback.
	61	+	#include "textflag.h"
	62	+
	63	+	TEXT callbackasm(SB),NOSPLIT\|NOFRAME,$0
	64	+	`)
	65	+	for i := 0; i < maxCallback; i++ {
	66	+	fmt.Fprintf(&buf, "\tMOVD\t$%d, R12\n", i)
	67	+	buf.WriteString("\tB\tcallbackasm1(SB)\n")
	68	+	}
	69	+	if err := os.WriteFile("zcallback_arm64.s", buf.Bytes(), 0644); err != nil {
	70	+	fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
	71	+	os.Exit(2)
	72	+	}
	73	+	}
	74	+
	75	+	func main() {
	76	+	genasmAmd64()
	77	+	genasmArm64()
	78	+	}

M zcallback_amd64.s +2001 -2001 large diff (4002 lines changed): collapsed

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M zcallback_arm64.s +4001 -4001 large diff (8002 lines changed): collapsed

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