Source file
src/runtime/wincallback.go
1
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7
8
9 package main
10
11 import (
12 "bytes"
13 "fmt"
14 "os"
15 )
16
17 const maxCallback = 2000
18
19 func genasm386Amd64() {
20 var buf bytes.Buffer
21
22 buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
23
24 //go:build 386 || amd64
25
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 := os.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 := os.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 genasmArm64() {
77 var buf bytes.Buffer
78
79 buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
80
81 // External code calls into callbackasm at an offset corresponding
82 // to the callback index. Callbackasm is a table of MOV and B instructions.
83 // The MOV instruction loads R12 with the callback index, and the
84 // B instruction branches to callbackasm1.
85 // callbackasm1 takes the callback index from R12 and
86 // indexes into an array that stores information about each callback.
87 // It then calls the Go implementation for that callback.
88 #include "textflag.h"
89
90 TEXT runtime·callbackasm(SB),NOSPLIT|NOFRAME,$0
91 `)
92 for i := 0; i < maxCallback; i++ {
93 buf.WriteString(fmt.Sprintf("\tMOVD\t$%d, R12\n", i))
94 buf.WriteString("\tB\truntime·callbackasm1(SB)\n")
95 }
96
97 err := os.WriteFile("zcallback_windows_arm64.s", buf.Bytes(), 0666)
98 if err != nil {
99 fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
100 os.Exit(2)
101 }
102 }
103
104 func gengo() {
105 var buf bytes.Buffer
106
107 buf.WriteString(fmt.Sprintf(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
108
109 package runtime
110
111 const cb_max = %d // maximum number of windows callbacks allowed
112 `, maxCallback))
113 err := os.WriteFile("zcallback_windows.go", buf.Bytes(), 0666)
114 if err != nil {
115 fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
116 os.Exit(2)
117 }
118 }
119
120 func main() {
121 genasm386Amd64()
122 genasmArm()
123 genasmArm64()
124 gengo()
125 }
126
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