Source file src/runtime/wincallback.go
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8
9 package main
10
11 import (
12 "bytes"
13 "fmt"
14 "io/ioutil"
15 "os"
16 )
17
18 const maxCallback = 2000
19
20 func genasm386Amd64() {
21 var buf bytes.Buffer
22
23 buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
24
25 // +build 386 amd64
26 // runtime·callbackasm is called by external code to
27 // execute Go implemented callback function. It is not
28 // called from the start, instead runtime·compilecallback
29 // always returns address into runtime·callbackasm offset
30 // appropriately so different callbacks start with different
31 // CALL instruction in runtime·callbackasm. This determines
32 // which Go callback function is executed later on.
33
34 TEXT runtime·callbackasm(SB),7,$0
35 `)
36 for i := 0; i < maxCallback; i++ {
37 buf.WriteString("\tCALL\truntime·callbackasm1(SB)\n")
38 }
39
40 filename := fmt.Sprintf("zcallback_windows.s")
41 err := ioutil.WriteFile(filename, buf.Bytes(), 0666)
42 if err != nil {
43 fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
44 os.Exit(2)
45 }
46 }
47
48 func genasmArm() {
49 var buf bytes.Buffer
50
51 buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
52
53 // External code calls into callbackasm at an offset corresponding
54 // to the callback index. Callbackasm is a table of MOV and B instructions.
55 // The MOV instruction loads R12 with the callback index, and the
56 // B instruction branches to callbackasm1.
57 // callbackasm1 takes the callback index from R12 and
58 // indexes into an array that stores information about each callback.
59 // It then calls the Go implementation for that callback.
60 #include "textflag.h"
61
62 TEXT runtime·callbackasm(SB),NOSPLIT|NOFRAME,$0
63 `)
64 for i := 0; i < maxCallback; i++ {
65 buf.WriteString(fmt.Sprintf("\tMOVW\t$%d, R12\n", i))
66 buf.WriteString("\tB\truntime·callbackasm1(SB)\n")
67 }
68
69 err := ioutil.WriteFile("zcallback_windows_arm.s", buf.Bytes(), 0666)
70 if err != nil {
71 fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
72 os.Exit(2)
73 }
74 }
75
76 func gengo() {
77 var buf bytes.Buffer
78
79 buf.WriteString(fmt.Sprintf(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
80
81 package runtime
82
83 const cb_max = %d // maximum number of windows callbacks allowed
84 `, maxCallback))
85 err := ioutil.WriteFile("zcallback_windows.go", buf.Bytes(), 0666)
86 if err != nil {
87 fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
88 os.Exit(2)
89 }
90 }
91
92 func main() {
93 genasm386Amd64()
94 genasmArm()
95 gengo()
96 }
97
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