| // 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. |
| |
| //go:build ignore |
| |
| // Generate Windows callback assembly file. |
| |
| package main |
| |
| import ( |
| "bytes" |
| "fmt" |
| "os" |
| ) |
| |
| const maxCallback = 2000 |
| |
| func genasm386Amd64() { |
| var buf bytes.Buffer |
| |
| buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT. |
| |
| //go:build 386 || amd64 |
| // +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 := os.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 := os.WriteFile("zcallback_windows_arm.s", buf.Bytes(), 0666) |
| if err != nil { |
| fmt.Fprintf(os.Stderr, "wincallback: %s\n", err) |
| os.Exit(2) |
| } |
| } |
| |
| func genasmArm64() { |
| 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,$0 |
| `) |
| for i := 0; i < maxCallback; i++ { |
| buf.WriteString(fmt.Sprintf("\tMOVD\t$%d, R12\n", i)) |
| buf.WriteString("\tB\truntime·callbackasm1(SB)\n") |
| } |
| |
| err := os.WriteFile("zcallback_windows_arm64.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 := os.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() |
| genasmArm64() |
| gengo() |
| } |