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
|
// 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 and other sys.stuff for arm, Linux
//
#include "arm/asm.h"
// OABI
//#define SYS_BASE 0x00900000
// EABI
#define SYS_BASE 0x0
#define SYS_exit (SYS_BASE + 1)
#define SYS_write (SYS_BASE + 4)
#define SYS_clone (SYS_BASE + 120)
#define SYS_mmap2 (SYS_BASE + 192)
#define SYS_gettid (SYS_BASE + 224)
#define SYS_futex (SYS_BASE + 240)
#define SYS_exit_group (SYS_BASE + 248)
TEXT write(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW $SYS_write, R7
SWI $0
RET
TEXT exit(SB),7,$-4
MOVW 0(FP), R0
MOVW $SYS_exit_group, R7
SWI $0
MOVW $1234, R0
MOVW $1002, R1
MOVW R0, (R1) // fail hard
TEXT exit1(SB),7,$-4
MOVW 0(FP), R0
MOVW $SYS_exit, R7
SWI $0
MOVW $1234, R0
MOVW $1003, R1
MOVW R0, (R1) // fail hard
TEXT runtime·mmap(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW 12(FP), R3
MOVW 16(FP), R4
MOVW 20(FP), R5
MOVW $SYS_mmap2, R7
SWI $0
RET
// int32 futex(int32 *uaddr, int32 op, int32 val,
// struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT futex(SB),7,$0
MOVW 4(SP), R0
MOVW 8(SP), R1
MOVW 12(SP), R2
MOVW 16(SP), R3
MOVW 20(SP), R4
MOVW 24(SP), R5
MOVW $SYS_futex, R7
SWI $0
RET
// int32 clone(int32 flags, void *stack, M *m, G *g, void (*fn)(void));
TEXT clone(SB),7,$0
MOVW flags+0(FP), R0
MOVW stack+4(FP), R1
MOVW $0, R2 // parent tid ptr
MOVW $0, R3 // tls_val
MOVW $0, R4 // child tid ptr
MOVW $0, R5
// Copy m, g, fn off parent stack for use by child.
// TODO(kaib): figure out which registers are clobbered by clone and avoid stack copying
MOVW $-16(R1), R1
MOVW mm+8(FP), R6
MOVW R6, 0(R1)
MOVW gg+12(FP), R6
MOVW R6, 4(R1)
MOVW fn+16(FP), R6
MOVW R6, 8(R1)
MOVW $1234, R6
MOVW R6, 12(R1)
MOVW $SYS_clone, R7
SWI $0
// In parent, return.
CMP $0, R0
BEQ 2(PC)
RET
// Paranoia: check that SP is as we expect. Use R13 to avoid linker 'fixup'
MOVW 12(R13), R0
MOVW $1234, R1
CMP R0, R1
BEQ 2(PC)
B abort(SB)
MOVW 0(R13), m
MOVW 4(R13), g
// paranoia; check they are not nil
MOVW 0(m), R0
MOVW 0(g), R0
BL emptyfunc(SB) // fault if stack check is wrong
// Initialize m->procid to Linux tid
MOVW $SYS_gettid, R7
SWI $0
MOVW R0, m_procid(m)
// Call fn
MOVW 8(R13), R0
MOVW $16(R13), R13
BL (R0)
MOVW $0, R0
MOVW R0, 4(R13)
BL exit1(SB)
// It shouldn't return
MOVW $1234, R0
MOVW $1005, R1
MOVW R0, (R1)
|
