Text file src/syscall/asm_unix_386.s
1 // +build netbsd freebsd openbsd
2
3 // Copyright 2009 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
6
7 #include "textflag.h"
8 #include "funcdata.h"
9
10 //
11 // System call support for some 386 unixes
12 //
13
14 // func Syscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32);
15 // func Syscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32);
16 // Trap # in AX, args on stack above caller pc.
17
18 TEXT ·Syscall(SB),NOSPLIT,$0-28
19 CALL runtime·entersyscall(SB)
20 MOVL trap+0(FP), AX // syscall entry
21 // slide args down on top of system call number
22 LEAL a1+4(FP), SI
23 LEAL trap+0(FP), DI
24 CLD
25 MOVSL
26 MOVSL
27 MOVSL
28 INT $0x80
29 JAE ok
30 MOVL $-1, r1+16(FP) // r1
31 MOVL $-1, r2+20(FP) // r2
32 MOVL AX, err+24(FP) // errno
33 CALL runtime·exitsyscall(SB)
34 RET
35 ok:
36 MOVL AX, r1+16(FP) // r1
37 MOVL DX, r2+20(FP) // r2
38 MOVL $0, err+24(FP) // errno
39 CALL runtime·exitsyscall(SB)
40 RET
41
42 TEXT ·Syscall6(SB),NOSPLIT,$0-40
43 CALL runtime·entersyscall(SB)
44 MOVL trap+0(FP), AX // syscall entry
45 // slide args down on top of system call number
46 LEAL a1+4(FP), SI
47 LEAL trap+0(FP), DI
48 CLD
49 MOVSL
50 MOVSL
51 MOVSL
52 MOVSL
53 MOVSL
54 MOVSL
55 INT $0x80
56 JAE ok6
57 MOVL $-1, r1+28(FP) // r1
58 MOVL $-1, r2+32(FP) // r2
59 MOVL AX, err+36(FP) // errno
60 CALL runtime·exitsyscall(SB)
61 RET
62 ok6:
63 MOVL AX, r1+28(FP) // r1
64 MOVL DX, r2+32(FP) // r2
65 MOVL $0, err+36(FP) // errno
66 CALL runtime·exitsyscall(SB)
67 RET
68
69 TEXT ·Syscall9(SB),NOSPLIT,$0-52
70 CALL runtime·entersyscall(SB)
71 MOVL num+0(FP), AX // syscall entry
72 // slide args down on top of system call number
73 LEAL a1+4(FP), SI
74 LEAL num+0(FP), DI
75 CLD
76 MOVSL
77 MOVSL
78 MOVSL
79 MOVSL
80 MOVSL
81 MOVSL
82 MOVSL
83 MOVSL
84 MOVSL
85 INT $0x80
86 JAE ok9
87 MOVL $-1, r1+40(FP) // r1
88 MOVL $-1, r2+44(FP) // r2
89 MOVL AX, err+48(FP) // errno
90 CALL runtime·exitsyscall(SB)
91 RET
92 ok9:
93 MOVL AX, r1+40(FP) // r1
94 MOVL DX, r2+44(FP) // r2
95 MOVL $0, err+48(FP) // errno
96 CALL runtime·exitsyscall(SB)
97 RET
98
99 TEXT ·RawSyscall(SB),NOSPLIT,$0-28
100 MOVL trap+0(FP), AX // syscall entry
101 // slide args down on top of system call number
102 LEAL a1+4(FP), SI
103 LEAL trap+0(FP), DI
104 CLD
105 MOVSL
106 MOVSL
107 MOVSL
108 INT $0x80
109 JAE ok1
110 MOVL $-1, r1+16(FP) // r1
111 MOVL $-1, r2+20(FP) // r2
112 MOVL AX, err+24(FP) // errno
113 RET
114 ok1:
115 MOVL AX, r1+16(FP) // r1
116 MOVL DX, r2+20(FP) // r2
117 MOVL $0, err+24(FP) // errno
118 RET
119
120 TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
121 MOVL trap+0(FP), AX // syscall entry
122 // slide args down on top of system call number
123 LEAL a1+4(FP), SI
124 LEAL trap+0(FP), DI
125 CLD
126 MOVSL
127 MOVSL
128 MOVSL
129 MOVSL
130 MOVSL
131 MOVSL
132 INT $0x80
133 JAE ok2
134 MOVL $-1, r1+28(FP) // r1
135 MOVL $-1, r2+32(FP) // r2
136 MOVL AX, err+36(FP) // errno
137 RET
138 ok2:
139 MOVL AX, r1+28(FP) // r1
140 MOVL DX, r2+32(FP) // r2
141 MOVL $0, err+36(FP) // errno
142 RET
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