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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
|
// Copyright 2013 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, NetBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 3
#define FD_CLOEXEC 1
#define F_SETFD 2
#define SWI_OS_NETBSD 0xa00000
#define SYS_exit SWI_OS_NETBSD | 1
#define SYS_read SWI_OS_NETBSD | 3
#define SYS_write SWI_OS_NETBSD | 4
#define SYS_open SWI_OS_NETBSD | 5
#define SYS_close SWI_OS_NETBSD | 6
#define SYS_getpid SWI_OS_NETBSD | 20
#define SYS_kill SWI_OS_NETBSD | 37
#define SYS_munmap SWI_OS_NETBSD | 73
#define SYS_madvise SWI_OS_NETBSD | 75
#define SYS_fcntl SWI_OS_NETBSD | 92
#define SYS_mmap SWI_OS_NETBSD | 197
#define SYS___sysctl SWI_OS_NETBSD | 202
#define SYS___sigaltstack14 SWI_OS_NETBSD | 281
#define SYS___sigprocmask14 SWI_OS_NETBSD | 293
#define SYS_getcontext SWI_OS_NETBSD | 307
#define SYS_setcontext SWI_OS_NETBSD | 308
#define SYS__lwp_create SWI_OS_NETBSD | 309
#define SYS__lwp_exit SWI_OS_NETBSD | 310
#define SYS__lwp_self SWI_OS_NETBSD | 311
#define SYS__lwp_getprivate SWI_OS_NETBSD | 316
#define SYS__lwp_setprivate SWI_OS_NETBSD | 317
#define SYS__lwp_kill SWI_OS_NETBSD | 318
#define SYS__lwp_unpark SWI_OS_NETBSD | 321
#define SYS___sigaction_sigtramp SWI_OS_NETBSD | 340
#define SYS_kqueue SWI_OS_NETBSD | 344
#define SYS_sched_yield SWI_OS_NETBSD | 350
#define SYS___setitimer50 SWI_OS_NETBSD | 425
#define SYS___clock_gettime50 SWI_OS_NETBSD | 427
#define SYS___nanosleep50 SWI_OS_NETBSD | 430
#define SYS___kevent50 SWI_OS_NETBSD | 435
#define SYS____lwp_park60 SWI_OS_NETBSD | 478
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
MOVW code+0(FP), R0 // arg 1 exit status
SWI $SYS_exit
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
// func exitThread(wait *atomic.Uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
MOVW wait+0(FP), R0
// We're done using the stack.
MOVW $0, R2
storeloop:
LDREX (R0), R4 // loads R4
STREX R2, (R0), R1 // stores R2
CMP $0, R1
BNE storeloop
SWI $SYS__lwp_exit
MOVW $1, R8 // crash
MOVW R8, (R8)
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
MOVW name+0(FP), R0
MOVW mode+4(FP), R1
MOVW perm+8(FP), R2
SWI $SYS_open
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0
SWI $SYS_close
MOVW.CS $-1, R0
MOVW R0, ret+4(FP)
RET
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0
MOVW p+4(FP), R1
MOVW n+8(FP), R2
SWI $SYS_read
RSB.CS $0, R0 // caller expects negative errno
MOVW R0, ret+12(FP)
RET
// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT,$0-16
MOVW $r+4(FP), R0
MOVW flags+0(FP), R1
SWI $0xa001c5
MOVW R0, errno+12(FP)
RET
TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVW p+4(FP), R1 // arg 2 - buf
MOVW n+8(FP), R2 // arg 3 - nbyte
SWI $SYS_write
RSB.CS $0, R0 // caller expects negative errno
MOVW R0, ret+12(FP)
RET
// int32 lwp_create(void *context, uintptr flags, void *lwpid)
TEXT runtime·lwp_create(SB),NOSPLIT,$0
MOVW ctxt+0(FP), R0
MOVW flags+4(FP), R1
MOVW lwpid+8(FP), R2
SWI $SYS__lwp_create
MOVW R0, ret+12(FP)
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
SWI $SYS_sched_yield
RET
TEXT runtime·lwp_park(SB),NOSPLIT,$8
MOVW clockid+0(FP), R0 // arg 1 - clock_id
MOVW flags+4(FP), R1 // arg 2 - flags
MOVW ts+8(FP), R2 // arg 3 - ts
MOVW unpark+12(FP), R3 // arg 4 - unpark
MOVW hint+16(FP), R4 // arg 5 - hint
MOVW R4, 4(R13)
MOVW unparkhint+20(FP), R5 // arg 6 - unparkhint
MOVW R5, 8(R13)
SWI $SYS____lwp_park60
MOVW R0, ret+24(FP)
RET
TEXT runtime·lwp_unpark(SB),NOSPLIT,$0
MOVW lwp+0(FP), R0 // arg 1 - lwp
MOVW hint+4(FP), R1 // arg 2 - hint
SWI $SYS__lwp_unpark
MOVW R0, ret+8(FP)
RET
TEXT runtime·lwp_self(SB),NOSPLIT,$0
SWI $SYS__lwp_self
MOVW R0, ret+0(FP)
RET
TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
MOVW R0, g_m(R1)
MOVW R1, g
BL runtime·emptyfunc(SB) // fault if stack check is wrong
BL (R2)
MOVW $2, R8 // crash (not reached)
MOVW R8, (R8)
RET
TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0
BL ·netbsdMstart0(SB)
RET // not reached
TEXT runtime·usleep(SB),NOSPLIT,$16
MOVW usec+0(FP), R0
CALL runtime·usplitR0(SB)
// 0(R13) is the saved LR, don't use it
MOVW R0, 4(R13) // tv_sec.low
MOVW $0, R0
MOVW R0, 8(R13) // tv_sec.high
MOVW $1000, R2
MUL R1, R2
MOVW R2, 12(R13) // tv_nsec
MOVW $4(R13), R0 // arg 1 - rqtp
MOVW $0, R1 // arg 2 - rmtp
SWI $SYS___nanosleep50
RET
TEXT runtime·lwp_kill(SB),NOSPLIT,$0-8
MOVW tid+0(FP), R0 // arg 1 - tid
MOVW sig+4(FP), R1 // arg 2 - signal
SWI $SYS__lwp_kill
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$16
SWI $SYS_getpid // the returned R0 is arg 1
MOVW sig+0(FP), R1 // arg 2 - signal
SWI $SYS_kill
RET
TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0
MOVW mode+0(FP), R0 // arg 1 - which
MOVW new+4(FP), R1 // arg 2 - itv
MOVW old+8(FP), R2 // arg 3 - oitv
SWI $SYS___setitimer50
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB), NOSPLIT, $32
MOVW $0, R0 // CLOCK_REALTIME
MOVW $8(R13), R1
SWI $SYS___clock_gettime50
MOVW 8(R13), R0 // sec.low
MOVW 12(R13), R1 // sec.high
MOVW 16(R13), R2 // nsec
MOVW R0, sec_lo+0(FP)
MOVW R1, sec_hi+4(FP)
MOVW R2, nsec+8(FP)
RET
// int64 nanotime1(void) so really
// void nanotime1(int64 *nsec)
TEXT runtime·nanotime1(SB), NOSPLIT, $32
MOVW $3, R0 // CLOCK_MONOTONIC
MOVW $8(R13), R1
SWI $SYS___clock_gettime50
MOVW 8(R13), R0 // sec.low
MOVW 12(R13), R4 // sec.high
MOVW 16(R13), R2 // nsec
MOVW $1000000000, R3
MULLU R0, R3, (R1, R0)
MUL R3, R4
ADD.S R2, R0
ADC R4, R1
MOVW R0, ret_lo+0(FP)
MOVW R1, ret_hi+4(FP)
RET
TEXT runtime·getcontext(SB),NOSPLIT|NOFRAME,$0
MOVW ctxt+0(FP), R0 // arg 1 - context
SWI $SYS_getcontext
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R0 // arg 1 - how
MOVW new+4(FP), R1 // arg 2 - set
MOVW old+8(FP), R2 // arg 3 - oset
SWI $SYS___sigprocmask14
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT sigreturn_tramp<>(SB),NOSPLIT|NOFRAME,$0
// on entry, SP points to siginfo, we add sizeof(ucontext)
// to SP to get a pointer to ucontext.
ADD $0x80, R13, R0 // 0x80 == sizeof(UcontextT)
SWI $SYS_setcontext
// something failed, we have to exit
MOVW $0x4242, R0 // magic return number
SWI $SYS_exit
B -2(PC) // continue exit
TEXT runtime·sigaction(SB),NOSPLIT,$4
MOVW sig+0(FP), R0 // arg 1 - signum
MOVW new+4(FP), R1 // arg 2 - nsa
MOVW old+8(FP), R2 // arg 3 - osa
MOVW $sigreturn_tramp<>(SB), R3 // arg 4 - tramp
MOVW $2, R4 // arg 5 - vers
MOVW R4, 4(R13)
ADD $4, R13 // pass arg 5 on stack
SWI $SYS___sigaction_sigtramp
SUB $4, R13
MOVW.CS $3, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
MOVW sig+4(FP), R0
MOVW info+8(FP), R1
MOVW ctx+12(FP), R2
MOVW fn+0(FP), R11
MOVW R13, R4
SUB $24, R13
BIC $0x7, R13 // alignment for ELF ABI
BL (R11)
MOVW R4, R13
RET
TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0
// Reserve space for callee-save registers and arguments.
MOVM.DB.W [R4-R11], (R13)
SUB $16, R13
// this might be called in external code context,
// where g is not set.
// first save R0, because runtime·load_g will clobber it
MOVW R0, 4(R13) // signum
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BL.NE runtime·load_g(SB)
MOVW R1, 8(R13)
MOVW R2, 12(R13)
BL runtime·sigtrampgo(SB)
// Restore callee-save registers.
ADD $16, R13
MOVM.IA.W (R13), [R4-R11]
RET
TEXT runtime·mmap(SB),NOSPLIT,$12
MOVW addr+0(FP), R0 // arg 1 - addr
MOVW n+4(FP), R1 // arg 2 - len
MOVW prot+8(FP), R2 // arg 3 - prot
MOVW flags+12(FP), R3 // arg 4 - flags
// arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack
// note the C runtime only passes the 32-bit offset_lo to us
MOVW fd+16(FP), R4 // arg 5
MOVW R4, 4(R13)
MOVW off+20(FP), R5 // arg 6 lower 32-bit
MOVW R5, 8(R13)
MOVW $0, R6 // higher 32-bit for arg 6
MOVW R6, 12(R13)
ADD $4, R13 // pass arg 5 and arg 6 on stack
SWI $SYS_mmap
SUB $4, R13
MOVW $0, R1
MOVW.CS R0, R1 // if error, move to R1
MOVW.CS $0, R0
MOVW R0, p+24(FP)
MOVW R1, err+28(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVW addr+0(FP), R0 // arg 1 - addr
MOVW n+4(FP), R1 // arg 2 - len
SWI $SYS_munmap
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVW addr+0(FP), R0 // arg 1 - addr
MOVW n+4(FP), R1 // arg 2 - len
MOVW flags+8(FP), R2 // arg 3 - behav
SWI $SYS_madvise
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
MOVW new+0(FP), R0 // arg 1 - nss
MOVW old+4(FP), R1 // arg 2 - oss
SWI $SYS___sigaltstack14
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·sysctl(SB),NOSPLIT,$8
MOVW mib+0(FP), R0 // arg 1 - name
MOVW miblen+4(FP), R1 // arg 2 - namelen
MOVW out+8(FP), R2 // arg 3 - oldp
MOVW size+12(FP), R3 // arg 4 - oldlenp
MOVW dst+16(FP), R4 // arg 5 - newp
MOVW R4, 4(R13)
MOVW ndst+20(FP), R4 // arg 6 - newlen
MOVW R4, 8(R13)
ADD $4, R13 // pass arg 5 and 6 on stack
SWI $SYS___sysctl
SUB $4, R13
MOVW R0, ret+24(FP)
RET
// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
SWI $SYS_kqueue
RSB.CS $0, R0
MOVW R0, ret+0(FP)
RET
// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
TEXT runtime·kevent(SB),NOSPLIT,$8
MOVW kq+0(FP), R0 // kq
MOVW ch+4(FP), R1 // changelist
MOVW nch+8(FP), R2 // nchanges
MOVW ev+12(FP), R3 // eventlist
MOVW nev+16(FP), R4 // nevents
MOVW R4, 4(R13)
MOVW ts+20(FP), R4 // timeout
MOVW R4, 8(R13)
ADD $4, R13 // pass arg 5 and 6 on stack
SWI $SYS___kevent50
RSB.CS $0, R0
SUB $4, R13
MOVW R0, ret+24(FP)
RET
// func fcntl(fd, cmd, args int32) int32
TEXT runtime·fcntl(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW cmd+4(FP), R1
MOVW arg+8(FP), R2
SWI $SYS_fcntl
RSB.CS $0, R0 // caller expects negative errno
MOVW R0, ret+12(FP)
RET
// void runtime·closeonexec(int32 fd)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW fd+0(FP), R0 // fd
MOVW $F_SETFD, R1 // F_SETFD
MOVW $FD_CLOEXEC, R2 // FD_CLOEXEC
SWI $SYS_fcntl
RET
// TODO: this is only valid for ARMv7+
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
B runtime·armPublicationBarrier(SB)
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
MOVM.WP [R1, R2, R3, R12], (R13)
SWI $SYS__lwp_getprivate
MOVM.IAW (R13), [R1, R2, R3, R12]
RET
|
