Text file src/pkg/syscall/asm_linux_386.s
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 calls for 386, Linux
10 //
11
12 // See ../runtime/sys_linux_386.s for the reason why we always use int 0x80
13 // instead of the glibc-specific "CALL 0x10(GS)".
14 #define INVOKE_SYSCALL INT $0x80
15
16 // func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
17 // Trap # in AX, args in BX CX DX SI DI, return in AX
18 TEXT ·Syscall(SB),NOSPLIT,$0-28
19 CALL runtime·entersyscall(SB)
20 MOVL trap+0(FP), AX // syscall entry
21 MOVL a1+4(FP), BX
22 MOVL a2+8(FP), CX
23 MOVL a3+12(FP), DX
24 MOVL $0, SI
25 MOVL $0, DI
26 INVOKE_SYSCALL
27 CMPL AX, $0xfffff001
28 JLS ok
29 MOVL $-1, r1+16(FP)
30 MOVL $0, r2+20(FP)
31 NEGL AX
32 MOVL AX, err+24(FP)
33 CALL runtime·exitsyscall(SB)
34 RET
35 ok:
36 MOVL AX, r1+16(FP)
37 MOVL DX, r2+20(FP)
38 MOVL $0, err+24(FP)
39 CALL runtime·exitsyscall(SB)
40 RET
41
42 // func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
43 TEXT ·Syscall6(SB),NOSPLIT,$0-40
44 CALL runtime·entersyscall(SB)
45 MOVL trap+0(FP), AX // syscall entry
46 MOVL a1+4(FP), BX
47 MOVL a2+8(FP), CX
48 MOVL a3+12(FP), DX
49 MOVL a4+16(FP), SI
50 MOVL a5+20(FP), DI
51 MOVL a6+24(FP), BP
52 INVOKE_SYSCALL
53 CMPL AX, $0xfffff001
54 JLS ok6
55 MOVL $-1, r1+28(FP)
56 MOVL $0, r2+32(FP)
57 NEGL AX
58 MOVL AX, err+36(FP)
59 CALL runtime·exitsyscall(SB)
60 RET
61 ok6:
62 MOVL AX, r1+28(FP)
63 MOVL DX, r2+32(FP)
64 MOVL $0, err+36(FP)
65 CALL runtime·exitsyscall(SB)
66 RET
67
68 // func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
69 TEXT ·RawSyscall(SB),NOSPLIT,$0-28
70 MOVL trap+0(FP), AX // syscall entry
71 MOVL a1+4(FP), BX
72 MOVL a2+8(FP), CX
73 MOVL a3+12(FP), DX
74 MOVL $0, SI
75 MOVL $0, DI
76 INVOKE_SYSCALL
77 CMPL AX, $0xfffff001
78 JLS ok1
79 MOVL $-1, r1+16(FP)
80 MOVL $0, r2+20(FP)
81 NEGL AX
82 MOVL AX, err+24(FP)
83 RET
84 ok1:
85 MOVL AX, r1+16(FP)
86 MOVL DX, r2+20(FP)
87 MOVL $0, err+24(FP)
88 RET
89
90 // func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
91 TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
92 MOVL trap+0(FP), AX // syscall entry
93 MOVL a1+4(FP), BX
94 MOVL a2+8(FP), CX
95 MOVL a3+12(FP), DX
96 MOVL a4+16(FP), SI
97 MOVL a5+20(FP), DI
98 MOVL a6+24(FP), BP
99 INVOKE_SYSCALL
100 CMPL AX, $0xfffff001
101 JLS ok2
102 MOVL $-1, r1+28(FP)
103 MOVL $0, r2+32(FP)
104 NEGL AX
105 MOVL AX, err+36(FP)
106 RET
107 ok2:
108 MOVL AX, r1+28(FP)
109 MOVL DX, r2+32(FP)
110 MOVL $0, err+36(FP)
111 RET
112
113 // func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr);
114 TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-24
115 MOVL trap+0(FP), AX // syscall entry
116 MOVL a1+4(FP), BX
117 MOVL a2+8(FP), CX
118 MOVL a3+12(FP), DX
119 MOVL $0, SI
120 MOVL $0, DI
121 INVOKE_SYSCALL
122 MOVL AX, r1+16(FP)
123 MOVL DX, r2+20(FP)
124 RET
125
126 #define SYS_SOCKETCALL 102 /* from zsysnum_linux_386.go */
127
128 // func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int)
129 // Kernel interface gets call sub-number and pointer to a0.
130 TEXT ·socketcall(SB),NOSPLIT,$0-36
131 CALL runtime·entersyscall(SB)
132 MOVL $SYS_SOCKETCALL, AX // syscall entry
133 MOVL call+0(FP), BX // socket call number
134 LEAL a0+4(FP), CX // pointer to call arguments
135 MOVL $0, DX
136 MOVL $0, SI
137 MOVL $0, DI
138 INVOKE_SYSCALL
139 CMPL AX, $0xfffff001
140 JLS oksock
141 MOVL $-1, n+28(FP)
142 NEGL AX
143 MOVL AX, err+32(FP)
144 CALL runtime·exitsyscall(SB)
145 RET
146 oksock:
147 MOVL AX, n+28(FP)
148 MOVL $0, err+32(FP)
149 CALL runtime·exitsyscall(SB)
150 RET
151
152 // func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int)
153 // Kernel interface gets call sub-number and pointer to a0.
154 TEXT ·rawsocketcall(SB),NOSPLIT,$0-36
155 MOVL $SYS_SOCKETCALL, AX // syscall entry
156 MOVL call+0(FP), BX // socket call number
157 LEAL a0+4(FP), CX // pointer to call arguments
158 MOVL $0, DX
159 MOVL $0, SI
160 MOVL $0, DI
161 INVOKE_SYSCALL
162 CMPL AX, $0xfffff001
163 JLS oksock1
164 MOVL $-1, n+28(FP)
165 NEGL AX
166 MOVL AX, err+32(FP)
167 RET
168 oksock1:
169 MOVL AX, n+28(FP)
170 MOVL $0, err+32(FP)
171 RET
172
173 #define SYS__LLSEEK 140 /* from zsysnum_linux_386.go */
174 // func Seek(fd int, offset int64, whence int) (newoffset int64, err int)
175 // Implemented in assembly to avoid allocation when
176 // taking the address of the return value newoffset.
177 // Underlying system call is
178 // llseek(int fd, int offhi, int offlo, int64 *result, int whence)
179 TEXT ·seek(SB),NOSPLIT,$0-28
180 CALL runtime·entersyscall(SB)
181 MOVL $SYS__LLSEEK, AX // syscall entry
182 MOVL fd+0(FP), BX
183 MOVL offset_hi+8(FP), CX
184 MOVL offset_lo+4(FP), DX
185 LEAL newoffset_lo+16(FP), SI // result pointer
186 MOVL whence+12(FP), DI
187 INVOKE_SYSCALL
188 CMPL AX, $0xfffff001
189 JLS okseek
190 MOVL $-1, newoffset_lo+16(FP)
191 MOVL $-1, newoffset_hi+20(FP)
192 NEGL AX
193 MOVL AX, err+24(FP)
194 CALL runtime·exitsyscall(SB)
195 RET
196 okseek:
197 // system call filled in newoffset already
198 MOVL $0, err+24(FP)
199 CALL runtime·exitsyscall(SB)
200 RET
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