File: asm_s390x.s

package info (click to toggle)
golang-1.7 1.7.1-3
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 67,916 kB
  • ctags: 135,228
  • sloc: asm: 43,658; ansic: 7,818; sh: 1,492; perl: 1,131; xml: 623; python: 286; yacc: 155; makefile: 109; cpp: 22; f90: 8; awk: 7
file content (1136 lines) | stat: -rw-r--r-- 29,382 bytes parent folder | download | duplicates (7)
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
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
// Copyright 2016 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.

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

// Indicate the status of vector facility
// -1: 	init value
// 0:	vector not installed
// 1:	vector installed and enabled
// 2:	vector installed but not enabled

DATA runtime·vectorfacility+0x00(SB)/4, $-1
GLOBL runtime·vectorfacility(SB), NOPTR, $4

TEXT runtime·checkvectorfacility(SB),NOSPLIT,$32-0
	MOVD    $2, R0
	MOVD	R1, tmp-32(SP)
	MOVD    $x-24(SP), R1
	XC	$24, 0(R1), 0(R1)
//      STFLE   0(R1)
	WORD    $0xB2B01000
	MOVBZ   z-8(SP), R1
	AND     $0x40, R1
	BNE     vectorinstalled
	MOVB    $0, runtime·vectorfacility(SB) //Vector not installed
	MOVD	tmp-32(SP), R1
	MOVD    $0, R0
	RET
vectorinstalled:
	// check if the vector instruction has been enabled
	VLEIB   $0, $0xF, V16
	VLGVB   $0, V16, R0
	CMPBEQ  R0, $0xF, vectorenabled
	MOVB    $2, runtime·vectorfacility(SB) //Vector installed but not enabled
	MOVD    tmp-32(SP), R1
	MOVD    $0, R0
	RET
vectorenabled:
	MOVB    $1, runtime·vectorfacility(SB) //Vector installed and enabled
	MOVD    tmp-32(SP), R1
	MOVD    $0, R0
	RET

TEXT runtime·rt0_go(SB),NOSPLIT,$0
	// R2 = argc; R3 = argv; R11 = temp; R13 = g; R15 = stack pointer
	// C TLS base pointer in AR0:AR1

	// initialize essential registers
	XOR	R0, R0

	SUB	$24, R15
	MOVW	R2, 8(R15) // argc
	MOVD	R3, 16(R15) // argv

	// create istack out of the given (operating system) stack.
	// _cgo_init may update stackguard.
	MOVD	$runtime·g0(SB), g
	MOVD	R15, R11
	SUB	$(64*1024), R11
	MOVD	R11, g_stackguard0(g)
	MOVD	R11, g_stackguard1(g)
	MOVD	R11, (g_stack+stack_lo)(g)
	MOVD	R15, (g_stack+stack_hi)(g)

	// if there is a _cgo_init, call it using the gcc ABI.
	MOVD	_cgo_init(SB), R11
	CMPBEQ	R11, $0, nocgo
	MOVW	AR0, R4			// (AR0 << 32 | AR1) is the TLS base pointer; MOVD is translated to EAR
	SLD	$32, R4, R4
	MOVW	AR1, R4			// arg 2: TLS base pointer
	MOVD	$setg_gcc<>(SB), R3 	// arg 1: setg
	MOVD	g, R2			// arg 0: G
	// C functions expect 160 bytes of space on caller stack frame
	// and an 8-byte aligned stack pointer
	MOVD	R15, R9			// save current stack (R9 is preserved in the Linux ABI)
	SUB	$160, R15		// reserve 160 bytes
	MOVD    $~7, R6
	AND 	R6, R15			// 8-byte align
	BL	R11			// this call clobbers volatile registers according to Linux ABI (R0-R5, R14)
	MOVD	R9, R15			// restore stack
	XOR	R0, R0			// zero R0

nocgo:
	// update stackguard after _cgo_init
	MOVD	(g_stack+stack_lo)(g), R2
	ADD	$const__StackGuard, R2
	MOVD	R2, g_stackguard0(g)
	MOVD	R2, g_stackguard1(g)

	// set the per-goroutine and per-mach "registers"
	MOVD	$runtime·m0(SB), R2

	// save m->g0 = g0
	MOVD	g, m_g0(R2)
	// save m0 to g0->m
	MOVD	R2, g_m(g)

	BL	runtime·check(SB)

	// argc/argv are already prepared on stack
	BL	runtime·args(SB)
	BL	runtime·osinit(SB)
	BL	runtime·schedinit(SB)

	// create a new goroutine to start program
	MOVD	$runtime·mainPC(SB), R2		// entry
	SUB     $24, R15
	MOVD 	R2, 16(R15)
	MOVD 	R0, 8(R15)
	MOVD 	R0, 0(R15)
	BL	runtime·newproc(SB)
	ADD	$24, R15

	// start this M
	BL	runtime·mstart(SB)

	MOVD	R0, 1(R0)
	RET

DATA	runtime·mainPC+0(SB)/8,$runtime·main(SB)
GLOBL	runtime·mainPC(SB),RODATA,$8

TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0
	MOVD	R0, 2(R0)
	RET

TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0
	RET

/*
 *  go-routine
 */

// void gosave(Gobuf*)
// save state in Gobuf; setjmp
TEXT runtime·gosave(SB), NOSPLIT, $-8-8
	MOVD	buf+0(FP), R3
	MOVD	R15, gobuf_sp(R3)
	MOVD	LR, gobuf_pc(R3)
	MOVD	g, gobuf_g(R3)
	MOVD	$0, gobuf_lr(R3)
	MOVD	$0, gobuf_ret(R3)
	MOVD	$0, gobuf_ctxt(R3)
	RET

// void gogo(Gobuf*)
// restore state from Gobuf; longjmp
TEXT runtime·gogo(SB), NOSPLIT, $-8-8
	MOVD	buf+0(FP), R5
	MOVD	gobuf_g(R5), g	// make sure g is not nil
	BL	runtime·save_g(SB)

	MOVD	0(g), R4
	MOVD	gobuf_sp(R5), R15
	MOVD	gobuf_lr(R5), LR
	MOVD	gobuf_ret(R5), R3
	MOVD	gobuf_ctxt(R5), R12
	MOVD	$0, gobuf_sp(R5)
	MOVD	$0, gobuf_ret(R5)
	MOVD	$0, gobuf_lr(R5)
	MOVD	$0, gobuf_ctxt(R5)
	CMP	R0, R0 // set condition codes for == test, needed by stack split
	MOVD	gobuf_pc(R5), R6
	BR	(R6)

// void mcall(fn func(*g))
// Switch to m->g0's stack, call fn(g).
// Fn must never return.  It should gogo(&g->sched)
// to keep running g.
TEXT runtime·mcall(SB), NOSPLIT, $-8-8
	// Save caller state in g->sched
	MOVD	R15, (g_sched+gobuf_sp)(g)
	MOVD	LR, (g_sched+gobuf_pc)(g)
	MOVD	R0, (g_sched+gobuf_lr)(g)
	MOVD	g, (g_sched+gobuf_g)(g)

	// Switch to m->g0 & its stack, call fn.
	MOVD	g, R3
	MOVD	g_m(g), R8
	MOVD	m_g0(R8), g
	BL	runtime·save_g(SB)
	CMP	g, R3
	BNE	2(PC)
	BR	runtime·badmcall(SB)
	MOVD	fn+0(FP), R12			// context
	MOVD	0(R12), R4			// code pointer
	MOVD	(g_sched+gobuf_sp)(g), R15	// sp = m->g0->sched.sp
	SUB	$16, R15
	MOVD	R3, 8(R15)
	MOVD	$0, 0(R15)
	BL	(R4)
	BR	runtime·badmcall2(SB)

// systemstack_switch is a dummy routine that systemstack leaves at the bottom
// of the G stack.  We need to distinguish the routine that
// lives at the bottom of the G stack from the one that lives
// at the top of the system stack because the one at the top of
// the system stack terminates the stack walk (see topofstack()).
TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0
	UNDEF
	BL	(LR)	// make sure this function is not leaf
	RET

// func systemstack(fn func())
TEXT runtime·systemstack(SB), NOSPLIT, $0-8
	MOVD	fn+0(FP), R3	// R3 = fn
	MOVD	R3, R12		// context
	MOVD	g_m(g), R4	// R4 = m

	MOVD	m_gsignal(R4), R5	// R5 = gsignal
	CMPBEQ	g, R5, noswitch

	MOVD	m_g0(R4), R5	// R5 = g0
	CMPBEQ	g, R5, noswitch

	MOVD	m_curg(R4), R6
	CMPBEQ	g, R6, switch

	// Bad: g is not gsignal, not g0, not curg. What is it?
	// Hide call from linker nosplit analysis.
	MOVD	$runtime·badsystemstack(SB), R3
	BL	(R3)

switch:
	// save our state in g->sched.  Pretend to
	// be systemstack_switch if the G stack is scanned.
	MOVD	$runtime·systemstack_switch(SB), R6
	ADD	$16, R6	// get past prologue
	MOVD	R6, (g_sched+gobuf_pc)(g)
	MOVD	R15, (g_sched+gobuf_sp)(g)
	MOVD	R0, (g_sched+gobuf_lr)(g)
	MOVD	g, (g_sched+gobuf_g)(g)

	// switch to g0
	MOVD	R5, g
	BL	runtime·save_g(SB)
	MOVD	(g_sched+gobuf_sp)(g), R3
	// make it look like mstart called systemstack on g0, to stop traceback
	SUB	$8, R3
	MOVD	$runtime·mstart(SB), R4
	MOVD	R4, 0(R3)
	MOVD	R3, R15

	// call target function
	MOVD	0(R12), R3	// code pointer
	BL	(R3)

	// switch back to g
	MOVD	g_m(g), R3
	MOVD	m_curg(R3), g
	BL	runtime·save_g(SB)
	MOVD	(g_sched+gobuf_sp)(g), R15
	MOVD	$0, (g_sched+gobuf_sp)(g)
	RET

noswitch:
	// already on m stack, just call directly
	MOVD	0(R12), R3	// code pointer
	BL	(R3)
	RET

/*
 * support for morestack
 */

// Called during function prolog when more stack is needed.
// Caller has already loaded:
// R3: framesize, R4: argsize, R5: LR
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must
// record an argument size. For that purpose, it has no arguments.
TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
	// Cannot grow scheduler stack (m->g0).
	MOVD	g_m(g), R7
	MOVD	m_g0(R7), R8
	CMPBNE	g, R8, 2(PC)
	BL	runtime·abort(SB)

	// Cannot grow signal stack (m->gsignal).
	MOVD	m_gsignal(R7), R8
	CMP	g, R8
	BNE	2(PC)
	BL	runtime·abort(SB)

	// Called from f.
	// Set g->sched to context in f.
	MOVD	R12, (g_sched+gobuf_ctxt)(g)
	MOVD	R15, (g_sched+gobuf_sp)(g)
	MOVD	LR, R8
	MOVD	R8, (g_sched+gobuf_pc)(g)
	MOVD	R5, (g_sched+gobuf_lr)(g)

	// Called from f.
	// Set m->morebuf to f's caller.
	MOVD	R5, (m_morebuf+gobuf_pc)(R7)	// f's caller's PC
	MOVD	R15, (m_morebuf+gobuf_sp)(R7)	// f's caller's SP
	MOVD	g, (m_morebuf+gobuf_g)(R7)

	// Call newstack on m->g0's stack.
	MOVD	m_g0(R7), g
	BL	runtime·save_g(SB)
	MOVD	(g_sched+gobuf_sp)(g), R15
	BL	runtime·newstack(SB)

	// Not reached, but make sure the return PC from the call to newstack
	// is still in this function, and not the beginning of the next.
	UNDEF

TEXT runtime·morestack_noctxt(SB),NOSPLIT|NOFRAME,$0-0
	MOVD	$0, R12
	BR	runtime·morestack(SB)

TEXT runtime·stackBarrier(SB),NOSPLIT,$0
	// We came here via a RET to an overwritten LR.
	// R3 may be live. Other registers are available.

	// Get the original return PC, g.stkbar[g.stkbarPos].savedLRVal.
	MOVD	(g_stkbar+slice_array)(g), R4
	MOVD	g_stkbarPos(g), R5
	MOVD	$stkbar__size, R6
	MULLD	R5, R6
	ADD	R4, R6
	MOVD	stkbar_savedLRVal(R6), R6
	// Record that this stack barrier was hit.
	ADD	$1, R5
	MOVD	R5, g_stkbarPos(g)
	// Jump to the original return PC.
	BR	(R6)

// reflectcall: call a function with the given argument list
// func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32).
// we don't have variable-sized frames, so we use a small number
// of constant-sized-frame functions to encode a few bits of size in the pc.
// Caution: ugly multiline assembly macros in your future!

#define DISPATCH(NAME,MAXSIZE)		\
	MOVD	$MAXSIZE, R4;		\
	CMP	R3, R4;		\
	BGT	3(PC);			\
	MOVD	$NAME(SB), R5;	\
	BR	(R5)
// Note: can't just "BR NAME(SB)" - bad inlining results.

TEXT reflect·call(SB), NOSPLIT, $0-0
	BR	·reflectcall(SB)

TEXT ·reflectcall(SB), NOSPLIT, $-8-32
	MOVWZ argsize+24(FP), R3
	// NOTE(rsc): No call16, because CALLFN needs four words
	// of argument space to invoke callwritebarrier.
	DISPATCH(runtime·call32, 32)
	DISPATCH(runtime·call64, 64)
	DISPATCH(runtime·call128, 128)
	DISPATCH(runtime·call256, 256)
	DISPATCH(runtime·call512, 512)
	DISPATCH(runtime·call1024, 1024)
	DISPATCH(runtime·call2048, 2048)
	DISPATCH(runtime·call4096, 4096)
	DISPATCH(runtime·call8192, 8192)
	DISPATCH(runtime·call16384, 16384)
	DISPATCH(runtime·call32768, 32768)
	DISPATCH(runtime·call65536, 65536)
	DISPATCH(runtime·call131072, 131072)
	DISPATCH(runtime·call262144, 262144)
	DISPATCH(runtime·call524288, 524288)
	DISPATCH(runtime·call1048576, 1048576)
	DISPATCH(runtime·call2097152, 2097152)
	DISPATCH(runtime·call4194304, 4194304)
	DISPATCH(runtime·call8388608, 8388608)
	DISPATCH(runtime·call16777216, 16777216)
	DISPATCH(runtime·call33554432, 33554432)
	DISPATCH(runtime·call67108864, 67108864)
	DISPATCH(runtime·call134217728, 134217728)
	DISPATCH(runtime·call268435456, 268435456)
	DISPATCH(runtime·call536870912, 536870912)
	DISPATCH(runtime·call1073741824, 1073741824)
	MOVD	$runtime·badreflectcall(SB), R5
	BR	(R5)

#define CALLFN(NAME,MAXSIZE)			\
TEXT NAME(SB), WRAPPER, $MAXSIZE-24;		\
	NO_LOCAL_POINTERS;			\
	/* copy arguments to stack */		\
	MOVD	arg+16(FP), R3;			\
	MOVWZ	argsize+24(FP), R4;			\
	MOVD	R15, R5;				\
	ADD	$(8-1), R5;			\
	SUB	$1, R3;				\
	ADD	R5, R4;				\
	CMP	R5, R4;				\
	BEQ	6(PC);				\
	ADD	$1, R3;				\
	ADD	$1, R5;				\
	MOVBZ	0(R3), R6;			\
	MOVBZ	R6, 0(R5);			\
	BR	-6(PC);				\
	/* call function */			\
	MOVD	f+8(FP), R12;			\
	MOVD	(R12), R8;			\
	PCDATA  $PCDATA_StackMapIndex, $0;	\
	BL	(R8);				\
	/* copy return values back */		\
	MOVD	arg+16(FP), R3;			\
	MOVWZ	n+24(FP), R4;			\
	MOVWZ	retoffset+28(FP), R6;		\
	MOVD	R15, R5;				\
	ADD	R6, R5; 			\
	ADD	R6, R3;				\
	SUB	R6, R4;				\
	ADD	$(8-1), R5;			\
	SUB	$1, R3;				\
	ADD	R5, R4;				\
loop:						\
	CMP	R5, R4;				\
	BEQ	end;				\
	ADD	$1, R5;				\
	ADD	$1, R3;				\
	MOVBZ	0(R5), R6;			\
	MOVBZ	R6, 0(R3);			\
	BR	loop;				\
end:						\
	/* execute write barrier updates */	\
	MOVD	argtype+0(FP), R7;		\
	MOVD	arg+16(FP), R3;			\
	MOVWZ	n+24(FP), R4;			\
	MOVWZ	retoffset+28(FP), R6;		\
	MOVD	R7, 8(R15);			\
	MOVD	R3, 16(R15);			\
	MOVD	R4, 24(R15);			\
	MOVD	R6, 32(R15);			\
	BL	runtime·callwritebarrier(SB);	\
	RET

CALLFN(·call32, 32)
CALLFN(·call64, 64)
CALLFN(·call128, 128)
CALLFN(·call256, 256)
CALLFN(·call512, 512)
CALLFN(·call1024, 1024)
CALLFN(·call2048, 2048)
CALLFN(·call4096, 4096)
CALLFN(·call8192, 8192)
CALLFN(·call16384, 16384)
CALLFN(·call32768, 32768)
CALLFN(·call65536, 65536)
CALLFN(·call131072, 131072)
CALLFN(·call262144, 262144)
CALLFN(·call524288, 524288)
CALLFN(·call1048576, 1048576)
CALLFN(·call2097152, 2097152)
CALLFN(·call4194304, 4194304)
CALLFN(·call8388608, 8388608)
CALLFN(·call16777216, 16777216)
CALLFN(·call33554432, 33554432)
CALLFN(·call67108864, 67108864)
CALLFN(·call134217728, 134217728)
CALLFN(·call268435456, 268435456)
CALLFN(·call536870912, 536870912)
CALLFN(·call1073741824, 1073741824)

TEXT runtime·procyield(SB),NOSPLIT,$0-0
	RET

// void jmpdefer(fv, sp);
// called from deferreturn.
// 1. grab stored LR for caller
// 2. sub 6 bytes to get back to BL deferreturn (size of BRASL instruction)
// 3. BR to fn
TEXT runtime·jmpdefer(SB),NOSPLIT|NOFRAME,$0-16
	MOVD	0(R15), R1
	SUB	$6, R1, LR

	MOVD	fv+0(FP), R12
	MOVD	argp+8(FP), R15
	SUB	$8, R15
	MOVD	0(R12), R3
	BR	(R3)

// Save state of caller into g->sched. Smashes R31.
TEXT gosave<>(SB),NOSPLIT|NOFRAME,$0
	MOVD	LR, (g_sched+gobuf_pc)(g)
	MOVD	R15, (g_sched+gobuf_sp)(g)
	MOVD	$0, (g_sched+gobuf_lr)(g)
	MOVD	$0, (g_sched+gobuf_ret)(g)
	MOVD	$0, (g_sched+gobuf_ctxt)(g)
	RET

// func asmcgocall(fn, arg unsafe.Pointer) int32
// Call fn(arg) on the scheduler stack,
// aligned appropriately for the gcc ABI.
// See cgocall.go for more details.
TEXT ·asmcgocall(SB),NOSPLIT,$0-20
	// R2 = argc; R3 = argv; R11 = temp; R13 = g; R15 = stack pointer
	// C TLS base pointer in AR0:AR1
	MOVD	fn+0(FP), R3
	MOVD	arg+8(FP), R4

	MOVD	R15, R2		// save original stack pointer
	MOVD	g, R5

	// Figure out if we need to switch to m->g0 stack.
	// We get called to create new OS threads too, and those
	// come in on the m->g0 stack already.
	MOVD	g_m(g), R6
	MOVD	m_g0(R6), R6
	CMPBEQ	R6, g, g0
	BL	gosave<>(SB)
	MOVD	R6, g
	BL	runtime·save_g(SB)
	MOVD	(g_sched+gobuf_sp)(g), R15

	// Now on a scheduling stack (a pthread-created stack).
g0:
	// Save room for two of our pointers, plus 160 bytes of callee
	// save area that lives on the caller stack.
	SUB	$176, R15
	MOVD	$~7, R6
	AND	R6, R15                 // 8-byte alignment for gcc ABI
	MOVD	R5, 168(R15)             // save old g on stack
	MOVD	(g_stack+stack_hi)(R5), R5
	SUB	R2, R5
	MOVD	R5, 160(R15)             // save depth in old g stack (can't just save SP, as stack might be copied during a callback)
	MOVD	R0, 0(R15)              // clear back chain pointer (TODO can we give it real back trace information?)
	MOVD	R4, R2                  // arg in R2
	BL	R3                      // can clobber: R0-R5, R14, F0-F3, F5, F7-F15

	XOR	R0, R0                  // set R0 back to 0.
	// Restore g, stack pointer.
	MOVD	168(R15), g
	BL	runtime·save_g(SB)
	MOVD	(g_stack+stack_hi)(g), R5
	MOVD	160(R15), R6
	SUB	R6, R5
	MOVD	R5, R15

	MOVW	R2, ret+16(FP)
	RET

// cgocallback(void (*fn)(void*), void *frame, uintptr framesize, uintptr ctxt)
// Turn the fn into a Go func (by taking its address) and call
// cgocallback_gofunc.
TEXT runtime·cgocallback(SB),NOSPLIT,$32-32
	MOVD	$fn+0(FP), R3
	MOVD	R3, 8(R15)
	MOVD	frame+8(FP), R3
	MOVD	R3, 16(R15)
	MOVD	framesize+16(FP), R3
	MOVD	R3, 24(R15)
	MOVD	ctxt+24(FP), R3
	MOVD	R3, 32(R15)
	MOVD	$runtime·cgocallback_gofunc(SB), R3
	BL	(R3)
	RET

// cgocallback_gofunc(FuncVal*, void *frame, uintptr framesize, uintptr ctxt)
// See cgocall.go for more details.
TEXT ·cgocallback_gofunc(SB),NOSPLIT,$16-32
	NO_LOCAL_POINTERS

	// Load m and g from thread-local storage.
	MOVB	runtime·iscgo(SB), R3
	CMPBEQ	R3, $0, nocgo
	BL	runtime·load_g(SB)

nocgo:
	// If g is nil, Go did not create the current thread.
	// Call needm to obtain one for temporary use.
	// In this case, we're running on the thread stack, so there's
	// lots of space, but the linker doesn't know. Hide the call from
	// the linker analysis by using an indirect call.
	CMPBEQ	g, $0, needm

	MOVD	g_m(g), R8
	MOVD	R8, savedm-8(SP)
	BR	havem

needm:
	MOVD	g, savedm-8(SP) // g is zero, so is m.
	MOVD	$runtime·needm(SB), R3
	BL	(R3)

	// Set m->sched.sp = SP, so that if a panic happens
	// during the function we are about to execute, it will
	// have a valid SP to run on the g0 stack.
	// The next few lines (after the havem label)
	// will save this SP onto the stack and then write
	// the same SP back to m->sched.sp. That seems redundant,
	// but if an unrecovered panic happens, unwindm will
	// restore the g->sched.sp from the stack location
	// and then systemstack will try to use it. If we don't set it here,
	// that restored SP will be uninitialized (typically 0) and
	// will not be usable.
	MOVD	g_m(g), R8
	MOVD	m_g0(R8), R3
	MOVD	R15, (g_sched+gobuf_sp)(R3)

havem:
	// Now there's a valid m, and we're running on its m->g0.
	// Save current m->g0->sched.sp on stack and then set it to SP.
	// Save current sp in m->g0->sched.sp in preparation for
	// switch back to m->curg stack.
	// NOTE: unwindm knows that the saved g->sched.sp is at 8(R1) aka savedsp-16(SP).
	MOVD	m_g0(R8), R3
	MOVD	(g_sched+gobuf_sp)(R3), R4
	MOVD	R4, savedsp-16(SP)
	MOVD	R15, (g_sched+gobuf_sp)(R3)

	// Switch to m->curg stack and call runtime.cgocallbackg.
	// Because we are taking over the execution of m->curg
	// but *not* resuming what had been running, we need to
	// save that information (m->curg->sched) so we can restore it.
	// We can restore m->curg->sched.sp easily, because calling
	// runtime.cgocallbackg leaves SP unchanged upon return.
	// To save m->curg->sched.pc, we push it onto the stack.
	// This has the added benefit that it looks to the traceback
	// routine like cgocallbackg is going to return to that
	// PC (because the frame we allocate below has the same
	// size as cgocallback_gofunc's frame declared above)
	// so that the traceback will seamlessly trace back into
	// the earlier calls.
	//
	// In the new goroutine, -8(SP) is unused (where SP refers to
	// m->curg's SP while we're setting it up, before we've adjusted it).
	MOVD	m_curg(R8), g
	BL	runtime·save_g(SB)
	MOVD	(g_sched+gobuf_sp)(g), R4 // prepare stack as R4
	MOVD	(g_sched+gobuf_pc)(g), R5
	MOVD	R5, -24(R4)
	MOVD	ctxt+24(FP), R5
	MOVD	R5, -16(R4)
	MOVD	$-24(R4), R15
	BL	runtime·cgocallbackg(SB)

	// Restore g->sched (== m->curg->sched) from saved values.
	MOVD	0(R15), R5
	MOVD	R5, (g_sched+gobuf_pc)(g)
	MOVD	$24(R15), R4
	MOVD	R4, (g_sched+gobuf_sp)(g)

	// Switch back to m->g0's stack and restore m->g0->sched.sp.
	// (Unlike m->curg, the g0 goroutine never uses sched.pc,
	// so we do not have to restore it.)
	MOVD	g_m(g), R8
	MOVD	m_g0(R8), g
	BL	runtime·save_g(SB)
	MOVD	(g_sched+gobuf_sp)(g), R15
	MOVD	savedsp-16(SP), R4
	MOVD	R4, (g_sched+gobuf_sp)(g)

	// If the m on entry was nil, we called needm above to borrow an m
	// for the duration of the call. Since the call is over, return it with dropm.
	MOVD	savedm-8(SP), R6
	CMPBNE	R6, $0, droppedm
	MOVD	$runtime·dropm(SB), R3
	BL	(R3)
droppedm:

	// Done!
	RET

// void setg(G*); set g. for use by needm.
TEXT runtime·setg(SB), NOSPLIT, $0-8
	MOVD	gg+0(FP), g
	// This only happens if iscgo, so jump straight to save_g
	BL	runtime·save_g(SB)
	RET

// void setg_gcc(G*); set g in C TLS.
// Must obey the gcc calling convention.
TEXT setg_gcc<>(SB),NOSPLIT|NOFRAME,$0-0
	// The standard prologue clobbers LR (R14), which is callee-save in
	// the C ABI, so we have to use NOFRAME and save LR ourselves.
	MOVD	LR, R1
	// Also save g, R10, and R11 since they're callee-save in C ABI
	MOVD	R10, R3
	MOVD	g, R4
	MOVD	R11, R5

	MOVD	R2, g
	BL	runtime·save_g(SB)

	MOVD	R5, R11
	MOVD	R4, g
	MOVD	R3, R10
	MOVD	R1, LR
	RET

TEXT runtime·getcallerpc(SB),NOSPLIT,$8-16
	MOVD	16(R15), R3		// LR saved by caller
	MOVD	runtime·stackBarrierPC(SB), R4
	CMPBNE	R3, R4, nobar
	// Get original return PC.
	BL	runtime·nextBarrierPC(SB)
	MOVD	8(R15), R3
nobar:
	MOVD	R3, ret+8(FP)
	RET

TEXT runtime·setcallerpc(SB),NOSPLIT,$8-16
	MOVD	pc+8(FP), R3
	MOVD	16(R15), R4
	MOVD	runtime·stackBarrierPC(SB), R5
	CMPBEQ	R4, R5, setbar
	MOVD	R3, 16(R15)		// set LR in caller
	RET
setbar:
	// Set the stack barrier return PC.
	MOVD	R3, 8(R15)
	BL	runtime·setNextBarrierPC(SB)
	RET

TEXT runtime·getcallersp(SB),NOSPLIT,$0-16
	MOVD	argp+0(FP), R3
	SUB	$8, R3
	MOVD	R3, ret+8(FP)
	RET

TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	(R0), R0
	UNDEF

// int64 runtime·cputicks(void)
TEXT runtime·cputicks(SB),NOSPLIT,$0-8
	// The TOD clock on s390 counts from the year 1900 in ~250ps intervals.
	// This means that since about 1972 the msb has been set, making the
	// result of a call to STORE CLOCK (stck) a negative number.
	// We clear the msb to make it positive.
	STCK	ret+0(FP)      // serialises before and after call
	MOVD	ret+0(FP), R3  // R3 will wrap to 0 in the year 2043
	SLD	$1, R3
	SRD	$1, R3
	MOVD	R3, ret+0(FP)
	RET

// memhash_varlen(p unsafe.Pointer, h seed) uintptr
// redirects to memhash(p, h, size) using the size
// stored in the closure.
TEXT runtime·memhash_varlen(SB),NOSPLIT,$40-24
	GO_ARGS
	NO_LOCAL_POINTERS
	MOVD	p+0(FP), R3
	MOVD	h+8(FP), R4
	MOVD	8(R12), R5
	MOVD	R3, 8(R15)
	MOVD	R4, 16(R15)
	MOVD	R5, 24(R15)
	BL	runtime·memhash(SB)
	MOVD	32(R15), R3
	MOVD	R3, ret+16(FP)
	RET

// AES hashing not implemented for s390x
TEXT runtime·aeshash(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	(R0), R15
TEXT runtime·aeshash32(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	(R0), R15
TEXT runtime·aeshash64(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	(R0), R15
TEXT runtime·aeshashstr(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	(R0), R15

// memequal(p, q unsafe.Pointer, size uintptr) bool
TEXT runtime·memequal(SB),NOSPLIT|NOFRAME,$0-25
	MOVD	p+0(FP), R3
	MOVD	q+8(FP), R5
	MOVD	size+16(FP), R6
	LA	ret+24(FP), R7
	BR	runtime·memeqbody(SB)

// memequal_varlen(a, b unsafe.Pointer) bool
TEXT runtime·memequal_varlen(SB),NOSPLIT|NOFRAME,$0-17
	MOVD	a+0(FP), R3
	MOVD	b+8(FP), R5
	MOVD	8(R12), R6    // compiler stores size at offset 8 in the closure
	LA	ret+16(FP), R7
	BR	runtime·memeqbody(SB)

// eqstring tests whether two strings are equal.
// The compiler guarantees that strings passed
// to eqstring have equal length.
// See runtime_test.go:eqstring_generic for
// equivalent Go code.
TEXT runtime·eqstring(SB),NOSPLIT|NOFRAME,$0-33
	MOVD	s1str+0(FP), R3
	MOVD	s1len+8(FP), R6
	MOVD	s2str+16(FP), R5
	LA	ret+32(FP), R7
	BR	runtime·memeqbody(SB)

TEXT bytes·Equal(SB),NOSPLIT|NOFRAME,$0-49
	MOVD	a_len+8(FP), R2
	MOVD	b_len+32(FP), R6
	MOVD	a+0(FP), R3
	MOVD	b+24(FP), R5
	LA	ret+48(FP), R7
	CMPBNE	R2, R6, notequal
	BR	runtime·memeqbody(SB)
notequal:
	MOVB	$0, ret+48(FP)
	RET

// input:
//   R3 = a
//   R5 = b
//   R6 = len
//   R7 = address of output byte (stores 0 or 1 here)
//   a and b have the same length
TEXT runtime·memeqbody(SB),NOSPLIT|NOFRAME,$0-0
	CMPBEQ	R3, R5, equal
loop:
	CMPBEQ	R6, $0, equal
	CMPBLT	R6, $32, tiny
	CMP	R6, $256
	BLT	tail
	CLC	$256, 0(R3), 0(R5)
	BNE	notequal
	SUB	$256, R6
	LA	256(R3), R3
	LA	256(R5), R5
	BR	loop
tail:
	SUB	$1, R6, R8
	EXRL	$runtime·memeqbodyclc(SB), R8
	BEQ	equal
notequal:
	MOVB	$0, 0(R7)
	RET
equal:
	MOVB	$1, 0(R7)
	RET
tiny:
	MOVD	$0, R2
	CMPBLT	R6, $16, lt16
	MOVD	0(R3), R8
	MOVD	0(R5), R9
	CMPBNE	R8, R9, notequal
	MOVD	8(R3), R8
	MOVD	8(R5), R9
	CMPBNE	R8, R9, notequal
	LA	16(R2), R2
	SUB	$16, R6
lt16:
	CMPBLT	R6, $8, lt8
	MOVD	0(R3)(R2*1), R8
	MOVD	0(R5)(R2*1), R9
	CMPBNE	R8, R9, notequal
	LA	8(R2), R2
	SUB	$8, R6
lt8:
	CMPBLT	R6, $4, lt4
	MOVWZ	0(R3)(R2*1), R8
	MOVWZ	0(R5)(R2*1), R9
	CMPBNE	R8, R9, notequal
	LA	4(R2), R2
	SUB	$4, R6
lt4:
#define CHECK(n) \
	CMPBEQ	R6, $n, equal \
	MOVB	n(R3)(R2*1), R8 \
	MOVB	n(R5)(R2*1), R9 \
	CMPBNE	R8, R9, notequal
	CHECK(0)
	CHECK(1)
	CHECK(2)
	CHECK(3)
	BR	equal

TEXT runtime·memeqbodyclc(SB),NOSPLIT|NOFRAME,$0-0
	CLC	$1, 0(R3), 0(R5)
	RET

TEXT runtime·fastrand1(SB), NOSPLIT, $0-4
	MOVD	g_m(g), R4
	MOVWZ	m_fastrand(R4), R3
	ADD	R3, R3
	CMPW	R3, $0
	BGE	2(PC)
	XOR	$0x88888eef, R3
	MOVW	R3, m_fastrand(R4)
	MOVW	R3, ret+0(FP)
	RET

TEXT bytes·IndexByte(SB),NOSPLIT,$0-40
	MOVD	s+0(FP), R3     // s => R3
	MOVD	s_len+8(FP), R4 // s_len => R4
	MOVBZ	c+24(FP), R5    // c => R5
	MOVD	$ret+32(FP), R2 // &ret => R9
	BR	runtime·indexbytebody(SB)

TEXT strings·IndexByte(SB),NOSPLIT,$0-32
	MOVD	s+0(FP), R3     // s => R3
	MOVD	s_len+8(FP), R4 // s_len => R4
	MOVBZ	c+16(FP), R5    // c => R5
	MOVD	$ret+24(FP), R2 // &ret => R9
	BR	runtime·indexbytebody(SB)

// input:
// R3: s
// R4: s_len
// R5: c -- byte sought
// R2: &ret -- address to put index into
TEXT runtime·indexbytebody(SB),NOSPLIT,$0
	CMPBEQ	R4, $0, notfound
	MOVD	R3, R6          // store base for later
	ADD	R3, R4, R8      // the address after the end of the string
	//if the length is small, use loop; otherwise, use vector or srst search
	CMPBGE	R4, $16, large

residual:
	CMPBEQ	R3, R8, notfound
	MOVBZ	0(R3), R7
	LA	1(R3), R3
	CMPBNE	R7, R5, residual

found:
	SUB	R6, R3
	SUB	$1, R3
	MOVD	R3, 0(R2)
	RET

notfound:
	MOVD	$-1, 0(R2)
	RET

large:
	MOVB	runtime·vectorfacility(SB), R1
	CMPBEQ	R1, $-1, checkvector	// vectorfacility = -1, vector not checked yet
vectorchecked:
	CMPBEQ	R1, $1, vectorimpl      // vectorfacility = 1, vector supported

srstimpl:                       // vectorfacility != 1, not support or enable vector
	MOVBZ	R5, R0          // c needs to be in R0, leave until last minute as currently R0 is expected to be 0
srstloop:
	WORD	$0xB25E0083     // srst %r8, %r3 (search the range [R3, R8))
	BVS	srstloop        // interrupted - continue
	BGT	notfoundr0
foundr0:
	XOR	R0, R0          // reset R0
	SUB	R6, R8          // remove base
	MOVD	R8, 0(R2)
	RET
notfoundr0:
	XOR	R0, R0          // reset R0
	MOVD	$-1, 0(R2)
	RET

vectorimpl:
	//if the address is not 16byte aligned, use loop for the header
	AND	$15, R3, R8
	CMPBGT	R8, $0, notaligned

aligned:
	ADD	R6, R4, R8
	AND	$-16, R8, R7
	// replicate c across V17
	VLVGB	$0, R5, V19
	VREPB	$0, V19, V17

vectorloop:
	CMPBGE	R3, R7, residual
	VL	0(R3), V16    // load string to be searched into V16
	ADD	$16, R3
	VFEEBS	V16, V17, V18 // search V17 in V16 and set conditional code accordingly
	BVS	vectorloop

	// when vector search found c in the string
	VLGVB	$7, V18, R7   // load 7th element of V18 containing index into R7
	SUB	$16, R3
	SUB	R6, R3
	ADD	R3, R7
	MOVD	R7, 0(R2)
	RET

notaligned:
	AND	$-16, R3, R8
	ADD     $16, R8
notalignedloop:
	CMPBEQ	R3, R8, aligned
	MOVBZ	0(R3), R7
	LA	1(R3), R3
	CMPBNE	R7, R5, notalignedloop
	BR	found

checkvector:
	CALL	runtime·checkvectorfacility(SB)
	MOVB    runtime·vectorfacility(SB), R1
	BR	vectorchecked

TEXT runtime·return0(SB), NOSPLIT, $0
	MOVW	$0, R3
	RET

// Called from cgo wrappers, this function returns g->m->curg.stack.hi.
// Must obey the gcc calling convention.
TEXT _cgo_topofstack(SB),NOSPLIT|NOFRAME,$0
	// g (R13), R10, R11 and LR (R14) are callee-save in the C ABI, so save them
	MOVD	g, R1
	MOVD	R10, R3
	MOVD	LR, R4
	MOVD	R11, R5

	BL	runtime·load_g(SB)	// clobbers g (R13), R10, R11
	MOVD	g_m(g), R2
	MOVD	m_curg(R2), R2
	MOVD	(g_stack+stack_hi)(R2), R2

	MOVD	R1, g
	MOVD	R3, R10
	MOVD	R4, LR
	MOVD	R5, R11
	RET

// The top-most function running on a goroutine
// returns to goexit+PCQuantum.
TEXT runtime·goexit(SB),NOSPLIT|NOFRAME,$0-0
	BYTE $0x07; BYTE $0x00; // 2-byte nop
	BL	runtime·goexit1(SB)	// does not return
	// traceback from goexit1 must hit code range of goexit
	BYTE $0x07; BYTE $0x00; // 2-byte nop

TEXT runtime·prefetcht0(SB),NOSPLIT,$0-8
	RET

TEXT runtime·prefetcht1(SB),NOSPLIT,$0-8
	RET

TEXT runtime·prefetcht2(SB),NOSPLIT,$0-8
	RET

TEXT runtime·prefetchnta(SB),NOSPLIT,$0-8
	RET

TEXT runtime·sigreturn(SB),NOSPLIT,$0-8
	RET

TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
	SYNC
	RET

TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40
	MOVD	s1_base+0(FP), R3
	MOVD	s1_len+8(FP), R4
	MOVD	s2_base+16(FP), R5
	MOVD	s2_len+24(FP), R6
	LA	ret+32(FP), R7
	BR	runtime·cmpbody(SB)

TEXT bytes·Compare(SB),NOSPLIT|NOFRAME,$0-56
	MOVD	s1+0(FP), R3
	MOVD	s1+8(FP), R4
	MOVD	s2+24(FP), R5
	MOVD	s2+32(FP), R6
	LA	res+48(FP), R7
	BR	runtime·cmpbody(SB)

// input:
//   R3 = a
//   R4 = alen
//   R5 = b
//   R6 = blen
//   R7 = address of output word (stores -1/0/1 here)
TEXT runtime·cmpbody(SB),NOSPLIT|NOFRAME,$0-0
	CMPBEQ	R3, R5, cmplengths
	MOVD	R4, R8
	CMPBLE	R4, R6, amin
	MOVD	R6, R8
amin:
	CMPBEQ	R8, $0, cmplengths
	CMP	R8, $256
	BLE	tail
loop:
	CLC	$256, 0(R3), 0(R5)
	BGT	gt
	BLT	lt
	SUB	$256, R8
	CMP	R8, $256
	BGT	loop
tail:
	SUB	$1, R8
	EXRL	$runtime·cmpbodyclc(SB), R8
	BGT	gt
	BLT	lt
cmplengths:
	CMP	R4, R6
	BEQ	eq
	BLT	lt
gt:
	MOVD	$1, 0(R7)
	RET
lt:
	MOVD	$-1, 0(R7)
	RET
eq:
	MOVD	$0, 0(R7)
	RET

TEXT runtime·cmpbodyclc(SB),NOSPLIT|NOFRAME,$0-0
	CLC	$1, 0(R3), 0(R5)
	RET

// This is called from .init_array and follows the platform, not Go, ABI.
// We are overly conservative. We could only save the registers we use.
// However, since this function is only called once per loaded module
// performance is unimportant.
TEXT runtime·addmoduledata(SB),NOSPLIT|NOFRAME,$0-0
	// Save R6-R15, F0, F2, F4 and F6 in the
	// register save area of the calling function
	STMG	R6, R15, 48(R15)
	FMOVD	F0, 128(R15)
	FMOVD	F2, 136(R15)
	FMOVD	F4, 144(R15)
	FMOVD	F6, 152(R15)

	// append the argument (passed in R2, as per the ELF ABI) to the
	// moduledata linked list.
	MOVD	runtime·lastmoduledatap(SB), R1
	MOVD	R2, moduledata_next(R1)
	MOVD	R2, runtime·lastmoduledatap(SB)

	// Restore R6-R15, F0, F2, F4 and F6
	LMG	48(R15), R6, R15
	FMOVD	F0, 128(R15)
	FMOVD	F2, 136(R15)
	FMOVD	F4, 144(R15)
	FMOVD	F6, 152(R15)
	RET

TEXT ·checkASM(SB),NOSPLIT,$0-1
	MOVB	$1, ret+0(FP)
	RET