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
165
166
167
168
169
170
171
172
173
174
175
176
|
// 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.
#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)
#define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
TEXT ·Syscall(SB),NOSPLIT,$168-64
NO_LOCAL_POINTERS
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), BP // syscall entry
// copy args down
LEAQ a1+8(FP), SI
LEAQ sysargs-160(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ $0, r2+40(FP)
CMPL AX, $-1
JNE ok3
LEAQ errbuf-128(SP), AX
MOVQ AX, sysargs-160(SP)
MOVQ $128, sysargs1-152(SP)
MOVQ $SYS_ERRSTR, BP
SYSCALL
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
MOVQ sysargs-160(SP), AX
MOVQ AX, errbuf-168(SP)
CALL runtime·gostring(SB)
LEAQ str-160(SP), SI
JMP copyresult3
ok3:
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
LEAQ ·emptystring(SB), SI
copyresult3:
LEAQ err+48(FP), DI
CLD
MOVSQ
MOVSQ
RET
TEXT ·Syscall6(SB),NOSPLIT,$168-88
NO_LOCAL_POINTERS
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), BP // syscall entry
// copy args down
LEAQ a1+8(FP), SI
LEAQ sysargs-160(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+56(FP)
MOVQ $0, r2+64(FP)
CMPL AX, $-1
JNE ok4
LEAQ errbuf-128(SP), AX
MOVQ AX, sysargs-160(SP)
MOVQ $128, sysargs1-152(SP)
MOVQ $SYS_ERRSTR, BP
SYSCALL
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
MOVQ sysargs-160(SP), AX
MOVQ AX, errbuf-168(SP)
CALL runtime·gostring(SB)
LEAQ str-160(SP), SI
JMP copyresult4
ok4:
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
LEAQ ·emptystring(SB), SI
copyresult4:
LEAQ err+72(FP), DI
CLD
MOVSQ
MOVSQ
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ trap+0(FP), BP // syscall entry
// slide args down on top of system call number
LEAQ a1+8(FP), SI
LEAQ trap+0(FP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ AX, r2+40(FP)
MOVQ AX, err+48(FP)
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVQ trap+0(FP), BP // syscall entry
// slide args down on top of system call number
LEAQ a1+8(FP), SI
LEAQ trap+0(FP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+56(FP)
MOVQ AX, r2+64(FP)
MOVQ AX, err+72(FP)
RET
#define SYS_SEEK 39 /* from zsysnum_plan9.go */
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT ·seek(SB),NOSPLIT,$48-56
NO_LOCAL_POINTERS
LEAQ newoffset+32(FP), AX
MOVQ AX, placeholder+0(FP)
// copy args down
LEAQ placeholder+0(FP), SI
LEAQ sysargs-40(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVQ $SYS_SEEK, BP // syscall entry
SYSCALL
CMPL AX, $-1
JNE ok6
MOVQ AX, newoffset+32(FP)
CALL syscall·errstr(SB)
MOVQ SP, SI
JMP copyresult6
ok6:
LEAQ ·emptystring(SB), SI
copyresult6:
LEAQ err+40(FP), DI
CLD
MOVSQ
MOVSQ
RET
|
