asm_plan9_386.s raw
1 // Copyright 2009 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 #include "textflag.h"
6 #include "funcdata.h"
7
8 //
9 // System call support for 386, Plan 9
10 //
11
12 //func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
13 //func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
14 //func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
15 //func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
16
17 #define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
18
19 // Trap # in AX, args on stack above caller pc.
20 TEXT ·Syscall(SB),NOSPLIT,$148-32
21 NO_LOCAL_POINTERS
22 CALL runtime·entersyscall(SB)
23 MOVL trap+0(FP), AX // syscall entry
24 // copy args down
25 LEAL a1+4(FP), SI
26 LEAL sysargs-144(SP), DI
27 CLD
28 MOVSL
29 MOVSL
30 MOVSL
31 INT $64
32 MOVL AX, r1+16(FP)
33 MOVL $0, r2+20(FP)
34 CMPL AX, $-1
35 JNE ok3
36
37 LEAL errbuf-128(SP), AX
38 MOVL AX, sysargs-144(SP)
39 MOVL $128, sysargs1-140(SP)
40 MOVL $SYS_ERRSTR, AX
41 INT $64
42 CALL runtime·exitsyscall(SB)
43 MOVL sysargs-144(SP), AX
44 MOVL AX, errbuf-148(SP)
45 CALL runtime·gostring(SB)
46 LEAL str-144(SP), SI
47 JMP copyresult3
48
49 ok3:
50 CALL runtime·exitsyscall(SB)
51 LEAL ·emptystring(SB), SI
52
53 copyresult3:
54 LEAL err+24(FP), DI
55
56 CLD
57 MOVSL
58 MOVSL
59
60 RET
61
62 TEXT ·Syscall6(SB),NOSPLIT,$148-44
63 NO_LOCAL_POINTERS
64 CALL runtime·entersyscall(SB)
65 MOVL trap+0(FP), AX // syscall entry
66 // copy args down
67 LEAL a1+4(FP), SI
68 LEAL sysargs-144(SP), DI
69 CLD
70 MOVSL
71 MOVSL
72 MOVSL
73 MOVSL
74 MOVSL
75 MOVSL
76 INT $64
77 MOVL AX, r1+28(FP)
78 MOVL $0, r2+32(FP)
79 CMPL AX, $-1
80 JNE ok4
81
82 LEAL errbuf-128(SP), AX
83 MOVL AX, sysargs-144(SP)
84 MOVL $128, sysargs1-140(SP)
85 MOVL $SYS_ERRSTR, AX
86 INT $64
87 CALL runtime·exitsyscall(SB)
88 MOVL sysargs-144(SP), AX
89 MOVL AX, errbuf-148(SP)
90 CALL runtime·gostring(SB)
91 LEAL str-144(SP), SI
92 JMP copyresult4
93
94 ok4:
95 CALL runtime·exitsyscall(SB)
96 LEAL ·emptystring(SB), SI
97
98 copyresult4:
99 LEAL err+36(FP), DI
100
101 CLD
102 MOVSL
103 MOVSL
104
105 RET
106
107 TEXT ·RawSyscall(SB),NOSPLIT,$0-28
108 MOVL trap+0(FP), AX // syscall entry
109 // slide args down on top of system call number
110 LEAL a1+4(FP), SI
111 LEAL trap+0(FP), DI
112 CLD
113 MOVSL
114 MOVSL
115 MOVSL
116 INT $64
117 MOVL AX, r1+16(FP)
118 MOVL AX, r2+20(FP)
119 MOVL AX, err+24(FP)
120 RET
121
122 TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
123 MOVL trap+0(FP), AX // syscall entry
124 // slide args down on top of system call number
125 LEAL a1+4(FP), SI
126 LEAL trap+0(FP), DI
127 CLD
128 MOVSL
129 MOVSL
130 MOVSL
131 MOVSL
132 MOVSL
133 MOVSL
134 INT $64
135 MOVL AX, r1+28(FP)
136 MOVL AX, r2+32(FP)
137 MOVL AX, err+36(FP)
138 RET
139
140 #define SYS_SEEK 39 /* from zsysnum_plan9.go */
141
142 //func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
143 TEXT ·seek(SB),NOSPLIT,$24-36
144 NO_LOCAL_POINTERS
145 LEAL newoffset+20(FP), AX
146 MOVL AX, placeholder+0(FP)
147
148 // copy args down
149 LEAL placeholder+0(FP), SI
150 LEAL sysargs-20(SP), DI
151 CLD
152 MOVSL
153 MOVSL
154 MOVSL
155 MOVSL
156 MOVSL
157 MOVL $SYS_SEEK, AX // syscall entry
158 INT $64
159
160 CMPL AX, $-1
161 JNE ok6
162 MOVL AX, newoffset_lo+20(FP)
163 MOVL AX, newoffset_hi+24(FP)
164
165 CALL syscall·errstr(SB)
166 MOVL SP, SI
167 JMP copyresult6
168
169 ok6:
170 LEAL ·emptystring(SB), SI
171
172 copyresult6:
173 LEAL err+28(FP), DI
174
175 CLD
176 MOVSL
177 MOVSL
178 RET
179