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
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
| // 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 AMD64, Linux
| //
|
| #include "go_asm.h"
| #include "go_tls.h"
| #include "textflag.h"
|
| #define AT_FDCWD -100
|
| #define SYS_read 0
| #define SYS_write 1
| #define SYS_close 3
| #define SYS_mmap 9
| #define SYS_munmap 11
| #define SYS_brk 12
| #define SYS_rt_sigaction 13
| #define SYS_rt_sigprocmask 14
| #define SYS_rt_sigreturn 15
| #define SYS_sched_yield 24
| #define SYS_mincore 27
| #define SYS_madvise 28
| #define SYS_nanosleep 35
| #define SYS_setittimer 38
| #define SYS_getpid 39
| #define SYS_socket 41
| #define SYS_connect 42
| #define SYS_clone 56
| #define SYS_exit 60
| #define SYS_kill 62
| #define SYS_fcntl 72
| #define SYS_sigaltstack 131
| #define SYS_arch_prctl 158
| #define SYS_gettid 186
| #define SYS_futex 202
| #define SYS_sched_getaffinity 204
| #define SYS_epoll_create 213
| #define SYS_exit_group 231
| #define SYS_epoll_ctl 233
| #define SYS_tgkill 234
| #define SYS_openat 257
| #define SYS_faccessat 269
| #define SYS_epoll_pwait 281
| #define SYS_epoll_create1 291
|
| TEXT runtime·exit(SB),NOSPLIT,$0-4
| MOVL code+0(FP), DI
| MOVL $SYS_exit_group, AX
| SYSCALL
| RET
|
| // func exitThread(wait *uint32)
| TEXT runtime·exitThread(SB),NOSPLIT,$0-8
| MOVQ wait+0(FP), AX
| // We're done using the stack.
| MOVL $0, (AX)
| MOVL $0, DI // exit code
| MOVL $SYS_exit, AX
| SYSCALL
| // We may not even have a stack any more.
| INT $3
| JMP 0(PC)
|
| TEXT runtime·open(SB),NOSPLIT,$0-20
| // This uses openat instead of open, because Android O blocks open.
| MOVL $AT_FDCWD, DI // AT_FDCWD, so this acts like open
| MOVQ name+0(FP), SI
| MOVL mode+8(FP), DX
| MOVL perm+12(FP), R10
| MOVL $SYS_openat, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS 2(PC)
| MOVL $-1, AX
| MOVL AX, ret+16(FP)
| RET
|
| TEXT runtime·closefd(SB),NOSPLIT,$0-12
| MOVL fd+0(FP), DI
| MOVL $SYS_close, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS 2(PC)
| MOVL $-1, AX
| MOVL AX, ret+8(FP)
| RET
|
| TEXT runtime·write(SB),NOSPLIT,$0-28
| MOVQ fd+0(FP), DI
| MOVQ p+8(FP), SI
| MOVL n+16(FP), DX
| MOVL $SYS_write, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS 2(PC)
| MOVL $-1, AX
| MOVL AX, ret+24(FP)
| RET
|
| TEXT runtime·read(SB),NOSPLIT,$0-28
| MOVL fd+0(FP), DI
| MOVQ p+8(FP), SI
| MOVL n+16(FP), DX
| MOVL $SYS_read, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS 2(PC)
| MOVL $-1, AX
| MOVL AX, ret+24(FP)
| RET
|
| TEXT runtime·usleep(SB),NOSPLIT,$16
| MOVL $0, DX
| MOVL usec+0(FP), AX
| MOVL $1000000, CX
| DIVL CX
| MOVQ AX, 0(SP)
| MOVL $1000, AX // usec to nsec
| MULL DX
| MOVQ AX, 8(SP)
|
| // nanosleep(&ts, 0)
| MOVQ SP, DI
| MOVL $0, SI
| MOVL $SYS_nanosleep, AX
| SYSCALL
| RET
|
| TEXT runtime·gettid(SB),NOSPLIT,$0-4
| MOVL $SYS_gettid, AX
| SYSCALL
| MOVL AX, ret+0(FP)
| RET
|
| TEXT runtime·raise(SB),NOSPLIT,$0
| MOVL $SYS_getpid, AX
| SYSCALL
| MOVL AX, R12
| MOVL $SYS_gettid, AX
| SYSCALL
| MOVL AX, SI // arg 2 tid
| MOVL R12, DI // arg 1 pid
| MOVL sig+0(FP), DX // arg 3
| MOVL $SYS_tgkill, AX
| SYSCALL
| RET
|
| TEXT runtime·raiseproc(SB),NOSPLIT,$0
| MOVL $SYS_getpid, AX
| SYSCALL
| MOVL AX, DI // arg 1 pid
| MOVL sig+0(FP), SI // arg 2
| MOVL $SYS_kill, AX
| SYSCALL
| RET
|
| TEXT runtime·setitimer(SB),NOSPLIT,$0-24
| MOVL mode+0(FP), DI
| MOVQ new+8(FP), SI
| MOVQ old+16(FP), DX
| MOVL $SYS_setittimer, AX
| SYSCALL
| RET
|
| TEXT runtime·mincore(SB),NOSPLIT,$0-28
| MOVQ addr+0(FP), DI
| MOVQ n+8(FP), SI
| MOVQ dst+16(FP), DX
| MOVL $SYS_mincore, AX
| SYSCALL
| MOVL AX, ret+24(FP)
| RET
|
| // func walltime() (sec int64, nsec int32)
| TEXT runtime·walltime(SB),NOSPLIT,$0-12
| // We don't know how much stack space the VDSO code will need,
| // so switch to g0.
| // In particular, a kernel configured with CONFIG_OPTIMIZE_INLINING=n
| // and hardening can use a full page of stack space in gettime_sym
| // due to stack probes inserted to avoid stack/heap collisions.
| // See issue #20427.
|
| MOVQ SP, BP // Save old SP; BP unchanged by C code.
|
| get_tls(CX)
| MOVQ g(CX), AX
| MOVQ g_m(AX), BX // BX unchanged by C code.
|
| // Set vdsoPC and vdsoSP for SIGPROF traceback.
| MOVQ 0(SP), DX
| MOVQ DX, m_vdsoPC(BX)
| LEAQ sec+0(SP), DX
| MOVQ DX, m_vdsoSP(BX)
|
| CMPQ AX, m_curg(BX) // Only switch if on curg.
| JNE noswitch
|
| MOVQ m_g0(BX), DX
| MOVQ (g_sched+gobuf_sp)(DX), SP // Set SP to g0 stack
|
| noswitch:
| SUBQ $16, SP // Space for results
| ANDQ $~15, SP // Align for C code
|
| MOVQ runtime·vdsoClockgettimeSym(SB), AX
| CMPQ AX, $0
| JEQ fallback
| MOVL $0, DI // CLOCK_REALTIME
| LEAQ 0(SP), SI
| CALL AX
| MOVQ 0(SP), AX // sec
| MOVQ 8(SP), DX // nsec
| MOVQ BP, SP // Restore real SP
| MOVQ $0, m_vdsoSP(BX)
| MOVQ AX, sec+0(FP)
| MOVL DX, nsec+8(FP)
| RET
| fallback:
| LEAQ 0(SP), DI
| MOVQ $0, SI
| MOVQ runtime·vdsoGettimeofdaySym(SB), AX
| CALL AX
| MOVQ 0(SP), AX // sec
| MOVL 8(SP), DX // usec
| IMULQ $1000, DX
| MOVQ BP, SP // Restore real SP
| MOVQ $0, m_vdsoSP(BX)
| MOVQ AX, sec+0(FP)
| MOVL DX, nsec+8(FP)
| RET
|
| TEXT runtime·nanotime(SB),NOSPLIT,$0-8
| // Switch to g0 stack. See comment above in runtime·walltime.
|
| MOVQ SP, BP // Save old SP; BP unchanged by C code.
|
| get_tls(CX)
| MOVQ g(CX), AX
| MOVQ g_m(AX), BX // BX unchanged by C code.
|
| // Set vdsoPC and vdsoSP for SIGPROF traceback.
| MOVQ 0(SP), DX
| MOVQ DX, m_vdsoPC(BX)
| LEAQ ret+0(SP), DX
| MOVQ DX, m_vdsoSP(BX)
|
| CMPQ AX, m_curg(BX) // Only switch if on curg.
| JNE noswitch
|
| MOVQ m_g0(BX), DX
| MOVQ (g_sched+gobuf_sp)(DX), SP // Set SP to g0 stack
|
| noswitch:
| SUBQ $16, SP // Space for results
| ANDQ $~15, SP // Align for C code
|
| MOVQ runtime·vdsoClockgettimeSym(SB), AX
| CMPQ AX, $0
| JEQ fallback
| MOVL $1, DI // CLOCK_MONOTONIC
| LEAQ 0(SP), SI
| CALL AX
| MOVQ 0(SP), AX // sec
| MOVQ 8(SP), DX // nsec
| MOVQ BP, SP // Restore real SP
| MOVQ $0, m_vdsoSP(BX)
| // sec is in AX, nsec in DX
| // return nsec in AX
| IMULQ $1000000000, AX
| ADDQ DX, AX
| MOVQ AX, ret+0(FP)
| RET
| fallback:
| LEAQ 0(SP), DI
| MOVQ $0, SI
| MOVQ runtime·vdsoGettimeofdaySym(SB), AX
| CALL AX
| MOVQ 0(SP), AX // sec
| MOVL 8(SP), DX // usec
| MOVQ BP, SP // Restore real SP
| MOVQ $0, m_vdsoSP(BX)
| IMULQ $1000, DX
| // sec is in AX, nsec in DX
| // return nsec in AX
| IMULQ $1000000000, AX
| ADDQ DX, AX
| MOVQ AX, ret+0(FP)
| RET
|
| TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-28
| MOVL how+0(FP), DI
| MOVQ new+8(FP), SI
| MOVQ old+16(FP), DX
| MOVL size+24(FP), R10
| MOVL $SYS_rt_sigprocmask, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS 2(PC)
| MOVL $0xf1, 0xf1 // crash
| RET
|
| TEXT runtime·rt_sigaction(SB),NOSPLIT,$0-36
| MOVQ sig+0(FP), DI
| MOVQ new+8(FP), SI
| MOVQ old+16(FP), DX
| MOVQ size+24(FP), R10
| MOVL $SYS_rt_sigaction, AX
| SYSCALL
| MOVL AX, ret+32(FP)
| RET
|
| // Call the function stored in _cgo_sigaction using the GCC calling convention.
| TEXT runtime·callCgoSigaction(SB),NOSPLIT,$16
| MOVQ sig+0(FP), DI
| MOVQ new+8(FP), SI
| MOVQ old+16(FP), DX
| MOVQ _cgo_sigaction(SB), AX
| MOVQ SP, BX // callee-saved
| ANDQ $~15, SP // alignment as per amd64 psABI
| CALL AX
| MOVQ BX, SP
| MOVL AX, ret+24(FP)
| RET
|
| TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
| MOVQ fn+0(FP), AX
| MOVL sig+8(FP), DI
| MOVQ info+16(FP), SI
| MOVQ ctx+24(FP), DX
| PUSHQ BP
| MOVQ SP, BP
| ANDQ $~15, SP // alignment for x86_64 ABI
| CALL AX
| MOVQ BP, SP
| POPQ BP
| RET
|
| TEXT runtime·sigtramp(SB),NOSPLIT,$72
| // Save callee-saved C registers, since the caller may be a C signal handler.
| MOVQ BX, bx-8(SP)
| MOVQ BP, bp-16(SP) // save in case GOEXPERIMENT=noframepointer is set
| MOVQ R12, r12-24(SP)
| MOVQ R13, r13-32(SP)
| MOVQ R14, r14-40(SP)
| MOVQ R15, r15-48(SP)
| // We don't save mxcsr or the x87 control word because sigtrampgo doesn't
| // modify them.
|
| MOVQ DX, ctx-56(SP)
| MOVQ SI, info-64(SP)
| MOVQ DI, signum-72(SP)
| MOVQ $runtime·sigtrampgo(SB), AX
| CALL AX
|
| MOVQ r15-48(SP), R15
| MOVQ r14-40(SP), R14
| MOVQ r13-32(SP), R13
| MOVQ r12-24(SP), R12
| MOVQ bp-16(SP), BP
| MOVQ bx-8(SP), BX
| RET
|
| // Used instead of sigtramp in programs that use cgo.
| // Arguments from kernel are in DI, SI, DX.
| TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
| // If no traceback function, do usual sigtramp.
| MOVQ runtime·cgoTraceback(SB), AX
| TESTQ AX, AX
| JZ sigtramp
|
| // If no traceback support function, which means that
| // runtime/cgo was not linked in, do usual sigtramp.
| MOVQ _cgo_callers(SB), AX
| TESTQ AX, AX
| JZ sigtramp
|
| // Figure out if we are currently in a cgo call.
| // If not, just do usual sigtramp.
| get_tls(CX)
| MOVQ g(CX),AX
| TESTQ AX, AX
| JZ sigtrampnog // g == nil
| MOVQ g_m(AX), AX
| TESTQ AX, AX
| JZ sigtramp // g.m == nil
| MOVL m_ncgo(AX), CX
| TESTL CX, CX
| JZ sigtramp // g.m.ncgo == 0
| MOVQ m_curg(AX), CX
| TESTQ CX, CX
| JZ sigtramp // g.m.curg == nil
| MOVQ g_syscallsp(CX), CX
| TESTQ CX, CX
| JZ sigtramp // g.m.curg.syscallsp == 0
| MOVQ m_cgoCallers(AX), R8
| TESTQ R8, R8
| JZ sigtramp // g.m.cgoCallers == nil
| MOVL m_cgoCallersUse(AX), CX
| TESTL CX, CX
| JNZ sigtramp // g.m.cgoCallersUse != 0
|
| // Jump to a function in runtime/cgo.
| // That function, written in C, will call the user's traceback
| // function with proper unwind info, and will then call back here.
| // The first three arguments, and the fifth, are already in registers.
| // Set the two remaining arguments now.
| MOVQ runtime·cgoTraceback(SB), CX
| MOVQ $runtime·sigtramp(SB), R9
| MOVQ _cgo_callers(SB), AX
| JMP AX
|
| sigtramp:
| JMP runtime·sigtramp(SB)
|
| sigtrampnog:
| // Signal arrived on a non-Go thread. If this is SIGPROF, get a
| // stack trace.
| CMPL DI, $27 // 27 == SIGPROF
| JNZ sigtramp
|
| // Lock sigprofCallersUse.
| MOVL $0, AX
| MOVL $1, CX
| MOVQ $runtime·sigprofCallersUse(SB), R11
| LOCK
| CMPXCHGL CX, 0(R11)
| JNZ sigtramp // Skip stack trace if already locked.
|
| // Jump to the traceback function in runtime/cgo.
| // It will call back to sigprofNonGo, which will ignore the
| // arguments passed in registers.
| // First three arguments to traceback function are in registers already.
| MOVQ runtime·cgoTraceback(SB), CX
| MOVQ $runtime·sigprofCallers(SB), R8
| MOVQ $runtime·sigprofNonGo(SB), R9
| MOVQ _cgo_callers(SB), AX
| JMP AX
|
| // For cgo unwinding to work, this function must look precisely like
| // the one in glibc. The glibc source code is:
| // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/x86_64/sigaction.c
| // The code that cares about the precise instructions used is:
| // https://gcc.gnu.org/viewcvs/gcc/trunk/libgcc/config/i386/linux-unwind.h?revision=219188&view=markup
| TEXT runtime·sigreturn(SB),NOSPLIT,$0
| MOVQ $SYS_rt_sigreturn, AX
| SYSCALL
| INT $3 // not reached
|
| TEXT runtime·sysMmap(SB),NOSPLIT,$0
| MOVQ addr+0(FP), DI
| MOVQ n+8(FP), SI
| MOVL prot+16(FP), DX
| MOVL flags+20(FP), R10
| MOVL fd+24(FP), R8
| MOVL off+28(FP), R9
|
| MOVL $SYS_mmap, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS ok
| NOTQ AX
| INCQ AX
| MOVQ $0, p+32(FP)
| MOVQ AX, err+40(FP)
| RET
| ok:
| MOVQ AX, p+32(FP)
| MOVQ $0, err+40(FP)
| RET
|
| // Call the function stored in _cgo_mmap using the GCC calling convention.
| // This must be called on the system stack.
| TEXT runtime·callCgoMmap(SB),NOSPLIT,$16
| MOVQ addr+0(FP), DI
| MOVQ n+8(FP), SI
| MOVL prot+16(FP), DX
| MOVL flags+20(FP), CX
| MOVL fd+24(FP), R8
| MOVL off+28(FP), R9
| MOVQ _cgo_mmap(SB), AX
| MOVQ SP, BX
| ANDQ $~15, SP // alignment as per amd64 psABI
| MOVQ BX, 0(SP)
| CALL AX
| MOVQ 0(SP), SP
| MOVQ AX, ret+32(FP)
| RET
|
| TEXT runtime·sysMunmap(SB),NOSPLIT,$0
| MOVQ addr+0(FP), DI
| MOVQ n+8(FP), SI
| MOVQ $SYS_munmap, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS 2(PC)
| MOVL $0xf1, 0xf1 // crash
| RET
|
| // Call the function stored in _cgo_munmap using the GCC calling convention.
| // This must be called on the system stack.
| TEXT runtime·callCgoMunmap(SB),NOSPLIT,$16-16
| MOVQ addr+0(FP), DI
| MOVQ n+8(FP), SI
| MOVQ _cgo_munmap(SB), AX
| MOVQ SP, BX
| ANDQ $~15, SP // alignment as per amd64 psABI
| MOVQ BX, 0(SP)
| CALL AX
| MOVQ 0(SP), SP
| RET
|
| TEXT runtime·madvise(SB),NOSPLIT,$0
| MOVQ addr+0(FP), DI
| MOVQ n+8(FP), SI
| MOVL flags+16(FP), DX
| MOVQ $SYS_madvise, AX
| SYSCALL
| MOVL AX, ret+24(FP)
| RET
|
| // int64 futex(int32 *uaddr, int32 op, int32 val,
| // struct timespec *timeout, int32 *uaddr2, int32 val2);
| TEXT runtime·futex(SB),NOSPLIT,$0
| MOVQ addr+0(FP), DI
| MOVL op+8(FP), SI
| MOVL val+12(FP), DX
| MOVQ ts+16(FP), R10
| MOVQ addr2+24(FP), R8
| MOVL val3+32(FP), R9
| MOVL $SYS_futex, AX
| SYSCALL
| MOVL AX, ret+40(FP)
| RET
|
| // int32 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
| TEXT runtime·clone(SB),NOSPLIT,$0
| MOVL flags+0(FP), DI
| MOVQ stk+8(FP), SI
| MOVQ $0, DX
| MOVQ $0, R10
|
| // Copy mp, gp, fn off parent stack for use by child.
| // Careful: Linux system call clobbers CX and R11.
| MOVQ mp+16(FP), R8
| MOVQ gp+24(FP), R9
| MOVQ fn+32(FP), R12
|
| MOVL $SYS_clone, AX
| SYSCALL
|
| // In parent, return.
| CMPQ AX, $0
| JEQ 3(PC)
| MOVL AX, ret+40(FP)
| RET
|
| // In child, on new stack.
| MOVQ SI, SP
|
| // If g or m are nil, skip Go-related setup.
| CMPQ R8, $0 // m
| JEQ nog
| CMPQ R9, $0 // g
| JEQ nog
|
| // Initialize m->procid to Linux tid
| MOVL $SYS_gettid, AX
| SYSCALL
| MOVQ AX, m_procid(R8)
|
| // Set FS to point at m->tls.
| LEAQ m_tls(R8), DI
| CALL runtime·settls(SB)
|
| // In child, set up new stack
| get_tls(CX)
| MOVQ R8, g_m(R9)
| MOVQ R9, g(CX)
| CALL runtime·stackcheck(SB)
|
| nog:
| // Call fn
| CALL R12
|
| // It shouldn't return. If it does, exit that thread.
| MOVL $111, DI
| MOVL $SYS_exit, AX
| SYSCALL
| JMP -3(PC) // keep exiting
|
| TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
| MOVQ new+0(FP), DI
| MOVQ old+8(FP), SI
| MOVQ $SYS_sigaltstack, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS 2(PC)
| MOVL $0xf1, 0xf1 // crash
| RET
|
| // set tls base to DI
| TEXT runtime·settls(SB),NOSPLIT,$32
| #ifdef GOOS_android
| // Same as in sys_darwin_386.s:/ugliness, different constant.
| // DI currently holds m->tls, which must be fs:0x1d0.
| // See cgo/gcc_android_amd64.c for the derivation of the constant.
| SUBQ $0x1d0, DI // In android, the tls base
| #else
| ADDQ $8, DI // ELF wants to use -8(FS)
| #endif
| MOVQ DI, SI
| MOVQ $0x1002, DI // ARCH_SET_FS
| MOVQ $SYS_arch_prctl, AX
| SYSCALL
| CMPQ AX, $0xfffffffffffff001
| JLS 2(PC)
| MOVL $0xf1, 0xf1 // crash
| RET
|
| TEXT runtime·osyield(SB),NOSPLIT,$0
| MOVL $SYS_sched_yield, AX
| SYSCALL
| RET
|
| TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
| MOVQ pid+0(FP), DI
| MOVQ len+8(FP), SI
| MOVQ buf+16(FP), DX
| MOVL $SYS_sched_getaffinity, AX
| SYSCALL
| MOVL AX, ret+24(FP)
| RET
|
| // int32 runtime·epollcreate(int32 size);
| TEXT runtime·epollcreate(SB),NOSPLIT,$0
| MOVL size+0(FP), DI
| MOVL $SYS_epoll_create, AX
| SYSCALL
| MOVL AX, ret+8(FP)
| RET
|
| // int32 runtime·epollcreate1(int32 flags);
| TEXT runtime·epollcreate1(SB),NOSPLIT,$0
| MOVL flags+0(FP), DI
| MOVL $SYS_epoll_create1, AX
| SYSCALL
| MOVL AX, ret+8(FP)
| RET
|
| // func epollctl(epfd, op, fd int32, ev *epollEvent) int
| TEXT runtime·epollctl(SB),NOSPLIT,$0
| MOVL epfd+0(FP), DI
| MOVL op+4(FP), SI
| MOVL fd+8(FP), DX
| MOVQ ev+16(FP), R10
| MOVL $SYS_epoll_ctl, AX
| SYSCALL
| MOVL AX, ret+24(FP)
| RET
|
| // int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
| TEXT runtime·epollwait(SB),NOSPLIT,$0
| // This uses pwait instead of wait, because Android O blocks wait.
| MOVL epfd+0(FP), DI
| MOVQ ev+8(FP), SI
| MOVL nev+16(FP), DX
| MOVL timeout+20(FP), R10
| MOVQ $0, R8
| MOVL $SYS_epoll_pwait, AX
| SYSCALL
| MOVL AX, ret+24(FP)
| RET
|
| // void runtime·closeonexec(int32 fd);
| TEXT runtime·closeonexec(SB),NOSPLIT,$0
| MOVL fd+0(FP), DI // fd
| MOVQ $2, SI // F_SETFD
| MOVQ $1, DX // FD_CLOEXEC
| MOVL $SYS_fcntl, AX
| SYSCALL
| RET
|
|
| // int access(const char *name, int mode)
| TEXT runtime·access(SB),NOSPLIT,$0
| // This uses faccessat instead of access, because Android O blocks access.
| MOVL $AT_FDCWD, DI // AT_FDCWD, so this acts like access
| MOVQ name+0(FP), SI
| MOVL mode+8(FP), DX
| MOVL $0, R10
| MOVL $SYS_faccessat, AX
| SYSCALL
| MOVL AX, ret+16(FP)
| RET
|
| // int connect(int fd, const struct sockaddr *addr, socklen_t addrlen)
| TEXT runtime·connect(SB),NOSPLIT,$0-28
| MOVL fd+0(FP), DI
| MOVQ addr+8(FP), SI
| MOVL len+16(FP), DX
| MOVL $SYS_connect, AX
| SYSCALL
| MOVL AX, ret+24(FP)
| RET
|
| // int socket(int domain, int type, int protocol)
| TEXT runtime·socket(SB),NOSPLIT,$0-20
| MOVL domain+0(FP), DI
| MOVL typ+4(FP), SI
| MOVL prot+8(FP), DX
| MOVL $SYS_socket, AX
| SYSCALL
| MOVL AX, ret+16(FP)
| RET
|
| // func sbrk0() uintptr
| TEXT runtime·sbrk0(SB),NOSPLIT,$0-8
| // Implemented as brk(NULL).
| MOVQ $0, DI
| MOVL $SYS_brk, AX
| SYSCALL
| MOVQ AX, ret+0(FP)
| RET
|
|
