1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP)
// so that go vet can check that they are correct.
#include "textflag.h"
#include "funcdata.h"
//
// System call support for Plan 9
//
//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall(SB),NOSPLIT,$0-64
CALL runtime·entersyscall(SB)
MOVQ 8(SP), BP // syscall entry
// slide args down on top of system call number
LEAQ 16(SP), SI
LEAQ 8(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+40(SP)
MOVQ $0, r2+48(SP)
CMPL AX, $-1
JNE ok3
SUBQ $16, SP
CALL runtime·errstr(SB)
MOVQ SP, SI
ADDQ $16, SP
JMP copyresult3
ok3:
LEAQ runtime·emptystring(SB), SI
copyresult3:
LEAQ err+56(SP), DI
CLD
MOVSQ
MOVSQ
CALL runtime·exitsyscall(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-88
CALL runtime·entersyscall(SB)
MOVQ 8(SP), BP // syscall entry
// slide args down on top of system call number
LEAQ 16(SP), SI
LEAQ 8(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+64(SP)
MOVQ $0, r2+72(SP)
CMPL AX, $-1
JNE ok4
SUBQ $16, SP
CALL runtime·errstr(SB)
MOVQ SP, SI
ADDQ $16, SP
JMP copyresult4
ok4:
LEAQ runtime·emptystring(SB), SI
copyresult4:
LEAQ err+80(SP), DI
CLD
MOVSQ
MOVSQ
CALL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ 8(SP), BP // syscall entry
// slide args down on top of system call number
LEAQ 16(SP), SI
LEAQ 8(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+40(SP)
MOVQ AX, r2+48(SP)
MOVQ AX, err+56(SP)
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVQ 8(SP), BP // syscall entry
// slide args down on top of system call number
LEAQ 16(SP), SI
LEAQ 8(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+64(SP)
MOVQ AX, r2+72(SP)
MOVQ AX, err+80(SP)
RET
#define SYS_SEEK 39 /* from zsysnum_plan9_amd64.go */
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT ·seek(SB),NOSPLIT,$0-56
LEAQ newoffset+40(SP), AX
MOVQ AX, placeholder+8(SP)
MOVQ $SYS_SEEK, BP // syscall entry
SYSCALL
CMPL AX, $-1
JNE ok6
MOVQ $-1, newoffset+40(SP)
SUBQ $16, SP
CALL syscall·errstr(SB)
MOVQ SP, SI
ADDQ $16, SP
JMP copyresult6
ok6:
LEAQ runtime·emptystring(SB), SI
copyresult6:
LEAQ err+48(SP), DI
CLD
MOVSQ
MOVSQ
RET
//func exit(code int)
// Import runtime·exit for cleanly exiting.
TEXT ·exit(SB),NOSPLIT,$8-8
NO_LOCAL_POINTERS
MOVQ code+0(FP), AX
MOVQ AX, 0(SP)
CALL runtime·exit(SB)
RET
|
