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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
// 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_gettimeofday (SYS_BASE + 78)
#define SYS_clone (SYS_BASE + 120)
#define SYS_rt_sigreturn (SYS_BASE + 173)
#define SYS_rt_sigaction (SYS_BASE + 174)
#define SYS_sigaltstack (SYS_BASE + 186)
#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)
#define SYS_munmap (SYS_BASE + 91)
#define ARM_BASE (SYS_BASE + 0x0f0000)
#define SYS_ARM_cacheflush (ARM_BASE + 2)
TEXT runtime·write(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW $SYS_write, R7
SWI $0
RET
TEXT runtime·exit(SB),7,$-4
MOVW 0(FP), R0
MOVW $SYS_exit_group, R7
SWI $0
MOVW $1234, R0
MOVW $1002, R1
MOVW R0, (R1) // fail hard
TEXT runtime·exit1(SB),7,$-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
TEXT runtime·munmap(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW $SYS_munmap, R7
SWI $0
RET
TEXT runtime·gettime(SB),7,$32
/* dummy version - return 0,0 */
MOVW $0, R1
MOVW 0(FP), R0
MOVW R1, 0(R0)
MOVW R1, 4(R0)
MOVW 4(FP), R0
MOVW R1, 0(R0)
/*
attempt at real version - seg faults
MOVW $8(SP), R0
MOVW $0, R1
MOVW $SYS_gettimeofday, R7
SWI $0
MOVW 0(FP), R0 // sec
MOVW 8(SP), R1
MOVW R1, 0(R0)
MOVW 4(FP), R0 // usec
MOVW 12(SP), R1
MOVW R1, 0(R0)
*/
RET
// int32 futex(int32 *uaddr, int32 op, int32 val,
// struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT runtime·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 runtime·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)
BL runtime·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 runtime·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 runtime·exit1(SB)
// It shouldn't return
MOVW $1234, R0
MOVW $1005, R1
MOVW R0, (R1)
TEXT runtime·cacheflush(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW $0, R2
MOVW $SYS_ARM_cacheflush, R7
SWI $0
RET
TEXT runtime·sigaltstack(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW $SYS_sigaltstack, R7
SWI $0
RET
TEXT runtime·sigignore(SB),7,$0
RET
TEXT runtime·sigtramp(SB),7,$24
MOVW m_gsignal(m), g
MOVW R0, 4(R13)
MOVW R1, 8(R13)
MOVW R2, 12(R13)
BL runtime·sighandler(SB)
RET
TEXT runtime·rt_sigaction(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW 12(FP), R3
MOVW $SYS_rt_sigaction, R7
SWI $0
RET
TEXT runtime·sigreturn(SB),7,$0
MOVW $SYS_rt_sigreturn, R7
SWI $0
RET
|
