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
|
// 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.
//
// System calls for arm, Linux
//
// TODO(kaib): handle error returns
// func Syscall(syscall uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
TEXT ·Syscall(SB),7,$0
BL runtime·entersyscall(SB)
MOVW 4(SP), R7
MOVW 8(SP), R0
MOVW 12(SP), R1
MOVW 16(SP), R2
SWI $0
MOVW $0xfffff001, R1
CMP R1, R0
BLS ok
MOVW $-1, R1
MOVW R1, 20(SP) // r1
MOVW $0, R2
MOVW R2, 24(SP) // r2
RSB $0, R0, R0
MOVW R0, 28(SP) // errno
BL runtime·exitsyscall(SB)
RET
ok:
MOVW R0, 20(SP) // r1
MOVW $0, R0
MOVW R0, 24(SP) // r2
MOVW R0, 28(SP) // errno
BL runtime·exitsyscall(SB)
RET
// func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
TEXT ·Syscall6(SB),7,$0
BL runtime·entersyscall(SB)
MOVW 4(SP), R7 // syscall entry
MOVW 8(SP), R0
MOVW 12(SP), R1
MOVW 16(SP), R2
MOVW 20(SP), R3
MOVW 24(SP), R4
MOVW 28(SP), R5
SWI $0
MOVW $0xfffff001, R6
CMP R6, R0
BLS ok6
MOVW $-1, R1
MOVW R1, 32(SP) // r1
MOVW $0, R2
MOVW R2, 36(SP) // r2
RSB $0, R0, R0
MOVW R0, 40(SP) // errno
BL runtime·exitsyscall(SB)
RET
ok6:
MOVW R0, 32(SP) // r1
MOVW R1, 36(SP) // r2
MOVW $0, R0
MOVW R0, 40(SP) // errno
BL runtime·exitsyscall(SB)
RET
#define SYS__LLSEEK 140 /* from zsysnum_linux_arm.go */
// func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)
// Implemented in assembly to avoid allocation when
// taking the address of the return value newoffset.
// Underlying system call is
// llseek(int fd, int offhi, int offlo, int64 *result, int whence)
TEXT ·Seek(SB),7,$0
BL runtime·entersyscall(SB)
MOVW $SYS__LLSEEK, R7 // syscall entry
MOVW 4(SP), R0 // fd
MOVW 12(SP), R1 // offset-high
MOVW 8(SP), R2 // offset-low
MOVW $20(SP), R3
MOVW 16(SP), R4 // whence
SWI $0
MOVW $0xfffff001, R6
CMP R6, R0
BLS okseek
MOVW $0, R1
MOVW R1, 20(SP)
MOVW R1, 24(SP)
RSB $0, R0, R0
MOVW R0, 28(SP) // errno
BL runtime·exitsyscall(SB)
RET
okseek:
// system call filled in newoffset already
MOVW $0, R0
MOVW R0, 28(SP) // errno
BL runtime·exitsyscall(SB)
RET
// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
TEXT ·RawSyscall(SB),7,$0
MOVW 4(SP), R7 // syscall entry
MOVW 8(SP), R0
MOVW 12(SP), R1
MOVW 16(SP), R2
SWI $0
MOVW $0xfffff001, R1
CMP R1, R0
BLS ok1
MOVW $-1, R1
MOVW R1, 20(SP) // r1
MOVW $0, R2
MOVW R2, 24(SP) // r2
RSB $0, R0, R0
MOVW R0, 28(SP) // errno
RET
ok1:
MOVW R0, 20(SP) // r1
MOVW $0, R0
MOVW R0, 24(SP) // r2
MOVW R0, 28(SP) // errno
RET
|
