summaryrefslogtreecommitdiffstats
path: root/src/runtime/sys_linux_mips64x.s
blob: c3e9f37694578e140cd38c7300b60bdc4b148db0 (plain)
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
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
// Copyright 2015 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.

// +build linux
// +build mips64 mips64le

//
// System calls and other sys.stuff for mips64, Linux
//

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"

#define AT_FDCWD -100

#define SYS_exit		5058
#define SYS_read		5000
#define SYS_write		5001
#define SYS_close		5003
#define SYS_getpid		5038
#define SYS_kill		5060
#define SYS_fcntl		5070
#define SYS_mmap		5009
#define SYS_munmap		5011
#define SYS_setitimer		5036
#define SYS_clone		5055
#define SYS_nanosleep		5034
#define SYS_sched_yield		5023
#define SYS_rt_sigreturn	5211
#define SYS_rt_sigaction	5013
#define SYS_rt_sigprocmask	5014
#define SYS_sigaltstack		5129
#define SYS_madvise		5027
#define SYS_mincore		5026
#define SYS_gettid		5178
#define SYS_futex		5194
#define SYS_sched_getaffinity	5196
#define SYS_exit_group		5205
#define SYS_epoll_create	5207
#define SYS_epoll_ctl		5208
#define SYS_tgkill		5225
#define SYS_openat		5247
#define SYS_epoll_pwait		5272
#define SYS_clock_gettime	5222
#define SYS_epoll_create1	5285
#define SYS_brk			5012
#define SYS_pipe2		5287

TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
	MOVW	code+0(FP), R4
	MOVV	$SYS_exit_group, R2
	SYSCALL
	RET

// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
	MOVV	wait+0(FP), R1
	// We're done using the stack.
	MOVW	$0, R2
	SYNC
	MOVW	R2, (R1)
	SYNC
	MOVW	$0, R4	// exit code
	MOVV	$SYS_exit, R2
	SYSCALL
	JMP	0(PC)

TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
	// This uses openat instead of open, because Android O blocks open.
	MOVW	$AT_FDCWD, R4 // AT_FDCWD, so this acts like open
	MOVV	name+0(FP), R5
	MOVW	mode+8(FP), R6
	MOVW	perm+12(FP), R7
	MOVV	$SYS_openat, R2
	SYSCALL
	BEQ	R7, 2(PC)
	MOVW	$-1, R2
	MOVW	R2, ret+16(FP)
	RET

TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
	MOVW	fd+0(FP), R4
	MOVV	$SYS_close, R2
	SYSCALL
	BEQ	R7, 2(PC)
	MOVW	$-1, R2
	MOVW	R2, ret+8(FP)
	RET

TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
	MOVV	fd+0(FP), R4
	MOVV	p+8(FP), R5
	MOVW	n+16(FP), R6
	MOVV	$SYS_write, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+24(FP)
	RET

TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
	MOVW	fd+0(FP), R4
	MOVV	p+8(FP), R5
	MOVW	n+16(FP), R6
	MOVV	$SYS_read, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+24(FP)
	RET

// func pipe() (r, w int32, errno int32)
TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
	MOVV	$r+0(FP), R4
	MOVV	R0, R5
	MOVV	$SYS_pipe2, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, errno+8(FP)
	RET

// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
	MOVV	$r+8(FP), R4
	MOVW	flags+0(FP), R5
	MOVV	$SYS_pipe2, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, errno+16(FP)
	RET

TEXT runtime·usleep(SB),NOSPLIT,$16-4
	MOVWU	usec+0(FP), R3
	MOVV	R3, R5
	MOVW	$1000000, R4
	DIVVU	R4, R3
	MOVV	LO, R3
	MOVV	R3, 8(R29)
	MOVW	$1000, R4
	MULVU	R3, R4
	MOVV	LO, R4
	SUBVU	R4, R5
	MOVV	R5, 16(R29)

	// nanosleep(&ts, 0)
	ADDV	$8, R29, R4
	MOVW	$0, R5
	MOVV	$SYS_nanosleep, R2
	SYSCALL
	RET

TEXT runtime·gettid(SB),NOSPLIT,$0-4
	MOVV	$SYS_gettid, R2
	SYSCALL
	MOVW	R2, ret+0(FP)
	RET

TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
	MOVV	$SYS_getpid, R2
	SYSCALL
	MOVW	R2, R16
	MOVV	$SYS_gettid, R2
	SYSCALL
	MOVW	R2, R5	// arg 2 tid
	MOVW	R16, R4	// arg 1 pid
	MOVW	sig+0(FP), R6	// arg 3
	MOVV	$SYS_tgkill, R2
	SYSCALL
	RET

TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
	MOVV	$SYS_getpid, R2
	SYSCALL
	MOVW	R2, R4	// arg 1 pid
	MOVW	sig+0(FP), R5	// arg 2
	MOVV	$SYS_kill, R2
	SYSCALL
	RET

TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8
	MOVV	$SYS_getpid, R2
	SYSCALL
	MOVV	R2, ret+0(FP)
	RET

TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24
	MOVV	tgid+0(FP), R4
	MOVV	tid+8(FP), R5
	MOVV	sig+16(FP), R6
	MOVV	$SYS_tgkill, R2
	SYSCALL
	RET

TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
	MOVW	mode+0(FP), R4
	MOVV	new+8(FP), R5
	MOVV	old+16(FP), R6
	MOVV	$SYS_setitimer, R2
	SYSCALL
	RET

TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
	MOVV	addr+0(FP), R4
	MOVV	n+8(FP), R5
	MOVV	dst+16(FP), R6
	MOVV	$SYS_mincore, R2
	SYSCALL
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+24(FP)
	RET

// func walltime1() (sec int64, nsec int32)
TEXT runtime·walltime1(SB),NOSPLIT,$16-12
	MOVV	R29, R16	// R16 is unchanged by C code
	MOVV	R29, R1

	MOVV	g_m(g), R17	// R17 = m

	// Set vdsoPC and vdsoSP for SIGPROF traceback.
	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVV	m_vdsoPC(R17), R2
	MOVV	m_vdsoSP(R17), R3
	MOVV	R2, 8(R29)
	MOVV	R3, 16(R29)

	MOVV	R31, m_vdsoPC(R17)
	MOVV	R29, m_vdsoSP(R17)

	MOVV	m_curg(R17), R4
	MOVV	g, R5
	BNE	R4, R5, noswitch

	MOVV	m_g0(R17), R4
	MOVV	(g_sched+gobuf_sp)(R4), R1	// Set SP to g0 stack

noswitch:
	SUBV	$16, R1
	AND	$~15, R1	// Align for C code
	MOVV	R1, R29

	MOVW	$0, R4 // CLOCK_REALTIME
	MOVV	$0(R29), R5

	MOVV	runtime·vdsoClockgettimeSym(SB), R25
	BEQ	R25, fallback

	JAL	(R25)
	// check on vdso call return for kernel compatibility
	// see https://golang.org/issues/39046
	// if we get any error make fallback permanent.
	BEQ	R2, R0, finish
	MOVV	R0, runtime·vdsoClockgettimeSym(SB)
	MOVW	$0, R4 // CLOCK_REALTIME
	MOVV	$0(R29), R5
	JMP	fallback

finish:
	MOVV	0(R29), R3	// sec
	MOVV	8(R29), R5	// nsec

	MOVV	R16, R29	// restore SP
	// Restore vdsoPC, vdsoSP
	// We don't worry about being signaled between the two stores.
	// If we are not in a signal handler, we'll restore vdsoSP to 0,
	// and no one will care about vdsoPC. If we are in a signal handler,
	// we cannot receive another signal.
	MOVV	16(R29), R1
	MOVV	R1, m_vdsoSP(R17)
	MOVV	8(R29), R1
	MOVV	R1, m_vdsoPC(R17)

	MOVV	R3, sec+0(FP)
	MOVW	R5, nsec+8(FP)
	RET

fallback:
	MOVV	$SYS_clock_gettime, R2
	SYSCALL
	JMP finish

TEXT runtime·nanotime1(SB),NOSPLIT,$16-8
	MOVV	R29, R16	// R16 is unchanged by C code
	MOVV	R29, R1

	MOVV	g_m(g), R17	// R17 = m

	// Set vdsoPC and vdsoSP for SIGPROF traceback.
	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVV	m_vdsoPC(R17), R2
	MOVV	m_vdsoSP(R17), R3
	MOVV	R2, 8(R29)
	MOVV	R3, 16(R29)

	MOVV	R31, m_vdsoPC(R17)
	MOVV	R29, m_vdsoSP(R17)

	MOVV	m_curg(R17), R4
	MOVV	g, R5
	BNE	R4, R5, noswitch

	MOVV	m_g0(R17), R4
	MOVV	(g_sched+gobuf_sp)(R4), R1	// Set SP to g0 stack

noswitch:
	SUBV	$16, R1
	AND	$~15, R1	// Align for C code
	MOVV	R1, R29

	MOVW	$1, R4 // CLOCK_MONOTONIC
	MOVV	$0(R29), R5

	MOVV	runtime·vdsoClockgettimeSym(SB), R25
	BEQ	R25, fallback

	JAL	(R25)
	// see walltime1 for detail
	BEQ	R2, R0, finish
	MOVV	R0, runtime·vdsoClockgettimeSym(SB)
	MOVW	$1, R4 // CLOCK_MONOTONIC
	MOVV	$0(R29), R5
	JMP	fallback

finish:
	MOVV	0(R29), R3	// sec
	MOVV	8(R29), R5	// nsec

	MOVV	R16, R29	// restore SP
	// Restore vdsoPC, vdsoSP
	// We don't worry about being signaled between the two stores.
	// If we are not in a signal handler, we'll restore vdsoSP to 0,
	// and no one will care about vdsoPC. If we are in a signal handler,
	// we cannot receive another signal.
	MOVV	16(R29), R1
	MOVV	R1, m_vdsoSP(R17)
	MOVV	8(R29), R1
	MOVV	R1, m_vdsoPC(R17)

	// sec is in R3, nsec in R5
	// return nsec in R3
	MOVV	$1000000000, R4
	MULVU	R4, R3
	MOVV	LO, R3
	ADDVU	R5, R3
	MOVV	R3, ret+0(FP)
	RET

fallback:
	MOVV	$SYS_clock_gettime, R2
	SYSCALL
	JMP	finish

TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
	MOVW	how+0(FP), R4
	MOVV	new+8(FP), R5
	MOVV	old+16(FP), R6
	MOVW	size+24(FP), R7
	MOVV	$SYS_rt_sigprocmask, R2
	SYSCALL
	BEQ	R7, 2(PC)
	MOVV	R0, 0xf1(R0)	// crash
	RET

TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
	MOVV	sig+0(FP), R4
	MOVV	new+8(FP), R5
	MOVV	old+16(FP), R6
	MOVV	size+24(FP), R7
	MOVV	$SYS_rt_sigaction, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+32(FP)
	RET

TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
	MOVW	sig+8(FP), R4
	MOVV	info+16(FP), R5
	MOVV	ctx+24(FP), R6
	MOVV	fn+0(FP), R25
	JAL	(R25)
	RET

TEXT runtime·sigtramp(SB),NOSPLIT,$64
	// initialize REGSB = PC&0xffffffff00000000
	BGEZAL	R0, 1(PC)
	SRLV	$32, R31, RSB
	SLLV	$32, RSB

	// this might be called in external code context,
	// where g is not set.
	MOVB	runtime·iscgo(SB), R1
	BEQ	R1, 2(PC)
	JAL	runtime·load_g(SB)

	MOVW	R4, 8(R29)
	MOVV	R5, 16(R29)
	MOVV	R6, 24(R29)
	MOVV	$runtime·sigtrampgo(SB), R1
	JAL	(R1)
	RET

TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
	JMP	runtime·sigtramp(SB)

TEXT runtime·mmap(SB),NOSPLIT|NOFRAME,$0
	MOVV	addr+0(FP), R4
	MOVV	n+8(FP), R5
	MOVW	prot+16(FP), R6
	MOVW	flags+20(FP), R7
	MOVW	fd+24(FP), R8
	MOVW	off+28(FP), R9

	MOVV	$SYS_mmap, R2
	SYSCALL
	BEQ	R7, ok
	MOVV	$0, p+32(FP)
	MOVV	R2, err+40(FP)
	RET
ok:
	MOVV	R2, p+32(FP)
	MOVV	$0, err+40(FP)
	RET

TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
	MOVV	addr+0(FP), R4
	MOVV	n+8(FP), R5
	MOVV	$SYS_munmap, R2
	SYSCALL
	BEQ	R7, 2(PC)
	MOVV	R0, 0xf3(R0)	// crash
	RET

TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
	MOVV	addr+0(FP), R4
	MOVV	n+8(FP), R5
	MOVW	flags+16(FP), R6
	MOVV	$SYS_madvise, R2
	SYSCALL
	MOVW	R2, ret+24(FP)
	RET

// int64 futex(int32 *uaddr, int32 op, int32 val,
//	struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
	MOVV	addr+0(FP), R4
	MOVW	op+8(FP), R5
	MOVW	val+12(FP), R6
	MOVV	ts+16(FP), R7
	MOVV	addr2+24(FP), R8
	MOVW	val3+32(FP), R9
	MOVV	$SYS_futex, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+40(FP)
	RET

// int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
	MOVW	flags+0(FP), R4
	MOVV	stk+8(FP), R5

	// Copy mp, gp, fn off parent stack for use by child.
	// Careful: Linux system call clobbers ???.
	MOVV	mp+16(FP), R16
	MOVV	gp+24(FP), R17
	MOVV	fn+32(FP), R18

	MOVV	R16, -8(R5)
	MOVV	R17, -16(R5)
	MOVV	R18, -24(R5)
	MOVV	$1234, R16
	MOVV	R16, -32(R5)

	MOVV	$SYS_clone, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno

	// In parent, return.
	BEQ	R2, 3(PC)
	MOVW	R2, ret+40(FP)
	RET

	// In child, on new stack.
	MOVV	-32(R29), R16
	MOVV	$1234, R1
	BEQ	R16, R1, 2(PC)
	MOVV	R0, 0(R0)

	// Initialize m->procid to Linux tid
	MOVV	$SYS_gettid, R2
	SYSCALL

	MOVV	-24(R29), R18		// fn
	MOVV	-16(R29), R17		// g
	MOVV	-8(R29), R16		// m

	BEQ	R16, nog
	BEQ	R17, nog

	MOVV	R2, m_procid(R16)

	// TODO: setup TLS.

	// In child, set up new stack
	MOVV	R16, g_m(R17)
	MOVV	R17, g
	//CALL	runtime·stackcheck(SB)

nog:
	// Call fn
	JAL	(R18)

	// It shouldn't return.	 If it does, exit that thread.
	MOVW	$111, R4
	MOVV	$SYS_exit, R2
	SYSCALL
	JMP	-3(PC)	// keep exiting

TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
	MOVV	new+0(FP), R4
	MOVV	old+8(FP), R5
	MOVV	$SYS_sigaltstack, R2
	SYSCALL
	BEQ	R7, 2(PC)
	MOVV	R0, 0xf1(R0)	// crash
	RET

TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
	MOVV	$SYS_sched_yield, R2
	SYSCALL
	RET

TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
	MOVV	pid+0(FP), R4
	MOVV	len+8(FP), R5
	MOVV	buf+16(FP), R6
	MOVV	$SYS_sched_getaffinity, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+24(FP)
	RET

// int32 runtime·epollcreate(int32 size);
TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
	MOVW    size+0(FP), R4
	MOVV	$SYS_epoll_create, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+8(FP)
	RET

// int32 runtime·epollcreate1(int32 flags);
TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
	MOVW	flags+0(FP), R4
	MOVV	$SYS_epoll_create1, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+8(FP)
	RET

// func epollctl(epfd, op, fd int32, ev *epollEvent) int
TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
	MOVW	epfd+0(FP), R4
	MOVW	op+4(FP), R5
	MOVW	fd+8(FP), R6
	MOVV	ev+16(FP), R7
	MOVV	$SYS_epoll_ctl, R2
	SYSCALL
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+24(FP)
	RET

// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
	// This uses pwait instead of wait, because Android O blocks wait.
	MOVW	epfd+0(FP), R4
	MOVV	ev+8(FP), R5
	MOVW	nev+16(FP), R6
	MOVW	timeout+20(FP), R7
	MOVV	$0, R8
	MOVV	$SYS_epoll_pwait, R2
	SYSCALL
	BEQ	R7, 2(PC)
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+24(FP)
	RET

// void runtime·closeonexec(int32 fd);
TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
	MOVW    fd+0(FP), R4  // fd
	MOVV    $2, R5  // F_SETFD
	MOVV    $1, R6  // FD_CLOEXEC
	MOVV	$SYS_fcntl, R2
	SYSCALL
	RET

// func runtime·setNonblock(int32 fd)
TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4
	MOVW	fd+0(FP), R4 // fd
	MOVV	$3, R5	// F_GETFL
	MOVV	$0, R6
	MOVV	$SYS_fcntl, R2
	SYSCALL
	MOVW	$0x80, R6 // O_NONBLOCK
	OR	R2, R6
	MOVW	fd+0(FP), R4 // fd
	MOVV	$4, R5	// F_SETFL
	MOVV	$SYS_fcntl, R2
	SYSCALL
	RET

// func sbrk0() uintptr
TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
	// Implemented as brk(NULL).
	MOVV	$0, R4
	MOVV	$SYS_brk, R2
	SYSCALL
	MOVV	R2, ret+0(FP)
	RET

TEXT runtime·access(SB),$0-20
	MOVV	R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
	MOVW	R0, ret+16(FP) // for vet
	RET

TEXT runtime·connect(SB),$0-28
	MOVV	R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
	MOVW	R0, ret+24(FP) // for vet
	RET

TEXT runtime·socket(SB),$0-20
	MOVV	R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
	MOVW	R0, ret+16(FP) // for vet
	RET