summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/rseq/rseq-mips.h
blob: 878739fae2fdeb917be6ed817a854b2fa09bdd3f (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
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
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
 * Author: Paul Burton <paul.burton@mips.com>
 * (C) Copyright 2018 MIPS Tech LLC
 *
 * Based on rseq-arm.h:
 * (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

/*
 * RSEQ_SIG uses the break instruction. The instruction pattern is:
 *
 * On MIPS:
 *	0350000d        break     0x350
 *
 * On nanoMIPS:
 *      00100350        break     0x350
 *
 * On microMIPS:
 *      0000d407        break     0x350
 *
 * For nanoMIPS32 and microMIPS, the instruction stream is encoded as 16-bit
 * halfwords, so the signature halfwords need to be swapped accordingly for
 * little-endian.
 */
#if defined(__nanomips__)
# ifdef __MIPSEL__
#  define RSEQ_SIG	0x03500010
# else
#  define RSEQ_SIG	0x00100350
# endif
#elif defined(__mips_micromips)
# ifdef __MIPSEL__
#  define RSEQ_SIG	0xd4070000
# else
#  define RSEQ_SIG	0x0000d407
# endif
#elif defined(__mips__)
# define RSEQ_SIG	0x0350000d
#else
/* Unknown MIPS architecture. */
#endif

#define rseq_smp_mb()	__asm__ __volatile__ ("sync" ::: "memory")
#define rseq_smp_rmb()	rseq_smp_mb()
#define rseq_smp_wmb()	rseq_smp_mb()

#define rseq_smp_load_acquire(p)					\
__extension__ ({							\
	__typeof(*p) ____p1 = RSEQ_READ_ONCE(*p);			\
	rseq_smp_mb();							\
	____p1;								\
})

#define rseq_smp_acquire__after_ctrl_dep()	rseq_smp_rmb()

#define rseq_smp_store_release(p, v)					\
do {									\
	rseq_smp_mb();							\
	RSEQ_WRITE_ONCE(*p, v);						\
} while (0)

#ifdef RSEQ_SKIP_FASTPATH
#include "rseq-skip.h"
#else /* !RSEQ_SKIP_FASTPATH */

#if _MIPS_SZLONG == 64
# define LONG			".dword"
# define LONG_LA		"dla"
# define LONG_L			"ld"
# define LONG_S			"sd"
# define LONG_ADDI		"daddiu"
# define U32_U64_PAD(x)		x
#elif _MIPS_SZLONG == 32
# define LONG			".word"
# define LONG_LA		"la"
# define LONG_L			"lw"
# define LONG_S			"sw"
# define LONG_ADDI		"addiu"
# ifdef __BIG_ENDIAN
#  define U32_U64_PAD(x)	"0x0, " x
# else
#  define U32_U64_PAD(x)	x ", 0x0"
# endif
#else
# error unsupported _MIPS_SZLONG
#endif

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
				post_commit_offset, abort_ip) \
		".pushsection __rseq_cs, \"aw\"\n\t" \
		".balign 32\n\t" \
		__rseq_str(label) ":\n\t"					\
		".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(post_commit_offset)) "\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(abort_ip)) "\n\t" \
		".popsection\n\t" \
		".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(label) "b") "\n\t" \
		".popsection\n\t"

#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
	__RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
				(post_commit_ip - start_ip), abort_ip)

/*
 * Exit points of a rseq critical section consist of all instructions outside
 * of the critical section where a critical section can either branch to or
 * reach through the normal course of its execution. The abort IP and the
 * post-commit IP are already part of the __rseq_cs section and should not be
 * explicitly defined as additional exit points. Knowing all exit points is
 * useful to assist debuggers stepping over the critical section.
 */
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
		".pushsection __rseq_exit_point_array, \"aw\"\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(exit_ip)) "\n\t" \
		".popsection\n\t"

#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
		RSEQ_INJECT_ASM(1) \
		LONG_LA " $4, " __rseq_str(cs_label) "\n\t" \
		LONG_S  " $4, %[" __rseq_str(rseq_cs) "]\n\t" \
		__rseq_str(label) ":\n\t"

#define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
		RSEQ_INJECT_ASM(2) \
		"lw  $4, %[" __rseq_str(current_cpu_id) "]\n\t" \
		"bne $4, %[" __rseq_str(cpu_id) "], " __rseq_str(label) "\n\t"

#define __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \
				abort_label, version, flags, \
				start_ip, post_commit_offset, abort_ip) \
		".balign 32\n\t" \
		__rseq_str(table_label) ":\n\t" \
		".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(post_commit_offset)) "\n\t" \
		LONG " " U32_U64_PAD(__rseq_str(abort_ip)) "\n\t" \
		".word " __rseq_str(RSEQ_SIG) "\n\t" \
		__rseq_str(label) ":\n\t" \
		teardown \
		"b %l[" __rseq_str(abort_label) "]\n\t"

#define RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, abort_label, \
			      start_ip, post_commit_ip, abort_ip) \
	__RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \
				abort_label, 0x0, 0x0, start_ip, \
				(post_commit_ip - start_ip), abort_ip)

#define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label) \
		__rseq_str(label) ":\n\t" \
		teardown \
		"b %l[" __rseq_str(cmpfail_label) "]\n\t"

static inline __attribute__((always_inline))
int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
{
	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
#endif
		/* Start rseq by storing table entry pointer into rseq_cs. */
		RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
		RSEQ_INJECT_ASM(3)
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], %l[cmpfail]\n\t"
		RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], %l[error2]\n\t"
#endif
		/* final store */
		LONG_S " %[newv], %[v]\n\t"
		"2:\n\t"
		RSEQ_INJECT_ASM(5)
		"b 5f\n\t"
		RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
		"5:\n\t"
		: /* gcc asm goto does not allow outputs */
		: [cpu_id]		"r" (cpu),
		  [current_cpu_id]	"m" (rseq_get_abi()->cpu_id),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  [v]			"m" (*v),
		  [expect]		"r" (expect),
		  [newv]		"r" (newv)
		  RSEQ_INJECT_INPUT
		: "$4", "memory"
		  RSEQ_INJECT_CLOBBER
		: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
		  , error1, error2
#endif
	);
	return 0;
abort:
	RSEQ_INJECT_FAILED
	return -1;
cmpfail:
	return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
	rseq_bug("cpu_id comparison failed");
error2:
	rseq_bug("expected value comparison failed");
#endif
}

static inline __attribute__((always_inline))
int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
			       long voffp, intptr_t *load, int cpu)
{
	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
#endif
		/* Start rseq by storing table entry pointer into rseq_cs. */
		RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
		RSEQ_INJECT_ASM(3)
		LONG_L " $4, %[v]\n\t"
		"beq $4, %[expectnot], %l[cmpfail]\n\t"
		RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
		LONG_L " $4, %[v]\n\t"
		"beq $4, %[expectnot], %l[error2]\n\t"
#endif
		LONG_S " $4, %[load]\n\t"
		LONG_ADDI " $4, %[voffp]\n\t"
		LONG_L " $4, 0($4)\n\t"
		/* final store */
		LONG_S " $4, %[v]\n\t"
		"2:\n\t"
		RSEQ_INJECT_ASM(5)
		"b 5f\n\t"
		RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
		"5:\n\t"
		: /* gcc asm goto does not allow outputs */
		: [cpu_id]		"r" (cpu),
		  [current_cpu_id]	"m" (rseq_get_abi()->cpu_id),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  /* final store input */
		  [v]			"m" (*v),
		  [expectnot]		"r" (expectnot),
		  [voffp]		"Ir" (voffp),
		  [load]		"m" (*load)
		  RSEQ_INJECT_INPUT
		: "$4", "memory"
		  RSEQ_INJECT_CLOBBER
		: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
		  , error1, error2
#endif
	);
	return 0;
abort:
	RSEQ_INJECT_FAILED
	return -1;
cmpfail:
	return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
	rseq_bug("cpu_id comparison failed");
error2:
	rseq_bug("expected value comparison failed");
#endif
}

static inline __attribute__((always_inline))
int rseq_addv(intptr_t *v, intptr_t count, int cpu)
{
	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
#endif
		/* Start rseq by storing table entry pointer into rseq_cs. */
		RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
		RSEQ_INJECT_ASM(3)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
#endif
		LONG_L " $4, %[v]\n\t"
		LONG_ADDI " $4, %[count]\n\t"
		/* final store */
		LONG_S " $4, %[v]\n\t"
		"2:\n\t"
		RSEQ_INJECT_ASM(4)
		"b 5f\n\t"
		RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
		"5:\n\t"
		: /* gcc asm goto does not allow outputs */
		: [cpu_id]		"r" (cpu),
		  [current_cpu_id]	"m" (rseq_get_abi()->cpu_id),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  [v]			"m" (*v),
		  [count]		"Ir" (count)
		  RSEQ_INJECT_INPUT
		: "$4", "memory"
		  RSEQ_INJECT_CLOBBER
		: abort
#ifdef RSEQ_COMPARE_TWICE
		  , error1
#endif
	);
	return 0;
abort:
	RSEQ_INJECT_FAILED
	return -1;
#ifdef RSEQ_COMPARE_TWICE
error1:
	rseq_bug("cpu_id comparison failed");
#endif
}

static inline __attribute__((always_inline))
int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
				 intptr_t *v2, intptr_t newv2,
				 intptr_t newv, int cpu)
{
	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
#endif
		/* Start rseq by storing table entry pointer into rseq_cs. */
		RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
		RSEQ_INJECT_ASM(3)
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], %l[cmpfail]\n\t"
		RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], %l[error2]\n\t"
#endif
		/* try store */
		LONG_S " %[newv2], %[v2]\n\t"
		RSEQ_INJECT_ASM(5)
		/* final store */
		LONG_S " %[newv], %[v]\n\t"
		"2:\n\t"
		RSEQ_INJECT_ASM(6)
		"b 5f\n\t"
		RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
		"5:\n\t"
		: /* gcc asm goto does not allow outputs */
		: [cpu_id]		"r" (cpu),
		  [current_cpu_id]	"m" (rseq_get_abi()->cpu_id),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  /* try store input */
		  [v2]			"m" (*v2),
		  [newv2]		"r" (newv2),
		  /* final store input */
		  [v]			"m" (*v),
		  [expect]		"r" (expect),
		  [newv]		"r" (newv)
		  RSEQ_INJECT_INPUT
		: "$4", "memory"
		  RSEQ_INJECT_CLOBBER
		: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
		  , error1, error2
#endif
	);
	return 0;
abort:
	RSEQ_INJECT_FAILED
	return -1;
cmpfail:
	return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
	rseq_bug("cpu_id comparison failed");
error2:
	rseq_bug("expected value comparison failed");
#endif
}

static inline __attribute__((always_inline))
int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
					 intptr_t *v2, intptr_t newv2,
					 intptr_t newv, int cpu)
{
	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
#endif
		/* Start rseq by storing table entry pointer into rseq_cs. */
		RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
		RSEQ_INJECT_ASM(3)
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], %l[cmpfail]\n\t"
		RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], %l[error2]\n\t"
#endif
		/* try store */
		LONG_S " %[newv2], %[v2]\n\t"
		RSEQ_INJECT_ASM(5)
		"sync\n\t"	/* full sync provides store-release */
		/* final store */
		LONG_S " %[newv], %[v]\n\t"
		"2:\n\t"
		RSEQ_INJECT_ASM(6)
		"b 5f\n\t"
		RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
		"5:\n\t"
		: /* gcc asm goto does not allow outputs */
		: [cpu_id]		"r" (cpu),
		  [current_cpu_id]	"m" (rseq_get_abi()->cpu_id),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  /* try store input */
		  [v2]			"m" (*v2),
		  [newv2]		"r" (newv2),
		  /* final store input */
		  [v]			"m" (*v),
		  [expect]		"r" (expect),
		  [newv]		"r" (newv)
		  RSEQ_INJECT_INPUT
		: "$4", "memory"
		  RSEQ_INJECT_CLOBBER
		: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
		  , error1, error2
#endif
	);
	return 0;
abort:
	RSEQ_INJECT_FAILED
	return -1;
cmpfail:
	return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
	rseq_bug("cpu_id comparison failed");
error2:
	rseq_bug("expected value comparison failed");
#endif
}

static inline __attribute__((always_inline))
int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
			      intptr_t *v2, intptr_t expect2,
			      intptr_t newv, int cpu)
{
	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error3])
#endif
		/* Start rseq by storing table entry pointer into rseq_cs. */
		RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
		RSEQ_INJECT_ASM(3)
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], %l[cmpfail]\n\t"
		RSEQ_INJECT_ASM(4)
		LONG_L " $4, %[v2]\n\t"
		"bne $4, %[expect2], %l[cmpfail]\n\t"
		RSEQ_INJECT_ASM(5)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], %l[error2]\n\t"
		LONG_L " $4, %[v2]\n\t"
		"bne $4, %[expect2], %l[error3]\n\t"
#endif
		/* final store */
		LONG_S " %[newv], %[v]\n\t"
		"2:\n\t"
		RSEQ_INJECT_ASM(6)
		"b 5f\n\t"
		RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
		"5:\n\t"
		: /* gcc asm goto does not allow outputs */
		: [cpu_id]		"r" (cpu),
		  [current_cpu_id]	"m" (rseq_get_abi()->cpu_id),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  /* cmp2 input */
		  [v2]			"m" (*v2),
		  [expect2]		"r" (expect2),
		  /* final store input */
		  [v]			"m" (*v),
		  [expect]		"r" (expect),
		  [newv]		"r" (newv)
		  RSEQ_INJECT_INPUT
		: "$4", "memory"
		  RSEQ_INJECT_CLOBBER
		: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
		  , error1, error2, error3
#endif
	);
	return 0;
abort:
	RSEQ_INJECT_FAILED
	return -1;
cmpfail:
	return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
	rseq_bug("cpu_id comparison failed");
error2:
	rseq_bug("1st expected value comparison failed");
error3:
	rseq_bug("2nd expected value comparison failed");
#endif
}

static inline __attribute__((always_inline))
int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
				 void *dst, void *src, size_t len,
				 intptr_t newv, int cpu)
{
	uintptr_t rseq_scratch[3];

	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
#endif
		LONG_S " %[src], %[rseq_scratch0]\n\t"
		LONG_S "  %[dst], %[rseq_scratch1]\n\t"
		LONG_S " %[len], %[rseq_scratch2]\n\t"
		/* Start rseq by storing table entry pointer into rseq_cs. */
		RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
		RSEQ_INJECT_ASM(3)
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], 5f\n\t"
		RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], 7f\n\t"
#endif
		/* try memcpy */
		"beqz %[len], 333f\n\t" \
		"222:\n\t" \
		"lb   $4, 0(%[src])\n\t" \
		"sb   $4, 0(%[dst])\n\t" \
		LONG_ADDI " %[src], 1\n\t" \
		LONG_ADDI " %[dst], 1\n\t" \
		LONG_ADDI " %[len], -1\n\t" \
		"bnez %[len], 222b\n\t" \
		"333:\n\t" \
		RSEQ_INJECT_ASM(5)
		/* final store */
		LONG_S " %[newv], %[v]\n\t"
		"2:\n\t"
		RSEQ_INJECT_ASM(6)
		/* teardown */
		LONG_L " %[len], %[rseq_scratch2]\n\t"
		LONG_L " %[dst], %[rseq_scratch1]\n\t"
		LONG_L " %[src], %[rseq_scratch0]\n\t"
		"b 8f\n\t"
		RSEQ_ASM_DEFINE_ABORT(3, 4,
				      /* teardown */
				      LONG_L " %[len], %[rseq_scratch2]\n\t"
				      LONG_L " %[dst], %[rseq_scratch1]\n\t"
				      LONG_L " %[src], %[rseq_scratch0]\n\t",
				      abort, 1b, 2b, 4f)
		RSEQ_ASM_DEFINE_CMPFAIL(5,
					/* teardown */
					LONG_L " %[len], %[rseq_scratch2]\n\t"
					LONG_L " %[dst], %[rseq_scratch1]\n\t"
					LONG_L " %[src], %[rseq_scratch0]\n\t",
					cmpfail)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_CMPFAIL(6,
					/* teardown */
					LONG_L " %[len], %[rseq_scratch2]\n\t"
					LONG_L " %[dst], %[rseq_scratch1]\n\t"
					LONG_L " %[src], %[rseq_scratch0]\n\t",
					error1)
		RSEQ_ASM_DEFINE_CMPFAIL(7,
					/* teardown */
					LONG_L " %[len], %[rseq_scratch2]\n\t"
					LONG_L " %[dst], %[rseq_scratch1]\n\t"
					LONG_L " %[src], %[rseq_scratch0]\n\t",
					error2)
#endif
		"8:\n\t"
		: /* gcc asm goto does not allow outputs */
		: [cpu_id]		"r" (cpu),
		  [current_cpu_id]	"m" (rseq_get_abi()->cpu_id),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  /* final store input */
		  [v]			"m" (*v),
		  [expect]		"r" (expect),
		  [newv]		"r" (newv),
		  /* try memcpy input */
		  [dst]			"r" (dst),
		  [src]			"r" (src),
		  [len]			"r" (len),
		  [rseq_scratch0]	"m" (rseq_scratch[0]),
		  [rseq_scratch1]	"m" (rseq_scratch[1]),
		  [rseq_scratch2]	"m" (rseq_scratch[2])
		  RSEQ_INJECT_INPUT
		: "$4", "memory"
		  RSEQ_INJECT_CLOBBER
		: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
		  , error1, error2
#endif
	);
	return 0;
abort:
	RSEQ_INJECT_FAILED
	return -1;
cmpfail:
	return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
	rseq_bug("cpu_id comparison failed");
error2:
	rseq_bug("expected value comparison failed");
#endif
}

static inline __attribute__((always_inline))
int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
					 void *dst, void *src, size_t len,
					 intptr_t newv, int cpu)
{
	uintptr_t rseq_scratch[3];

	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
		RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
#endif
		LONG_S " %[src], %[rseq_scratch0]\n\t"
		LONG_S " %[dst], %[rseq_scratch1]\n\t"
		LONG_S " %[len], %[rseq_scratch2]\n\t"
		/* Start rseq by storing table entry pointer into rseq_cs. */
		RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
		RSEQ_INJECT_ASM(3)
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], 5f\n\t"
		RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
		LONG_L " $4, %[v]\n\t"
		"bne $4, %[expect], 7f\n\t"
#endif
		/* try memcpy */
		"beqz %[len], 333f\n\t" \
		"222:\n\t" \
		"lb   $4, 0(%[src])\n\t" \
		"sb   $4, 0(%[dst])\n\t" \
		LONG_ADDI " %[src], 1\n\t" \
		LONG_ADDI " %[dst], 1\n\t" \
		LONG_ADDI " %[len], -1\n\t" \
		"bnez %[len], 222b\n\t" \
		"333:\n\t" \
		RSEQ_INJECT_ASM(5)
		"sync\n\t"	/* full sync provides store-release */
		/* final store */
		LONG_S " %[newv], %[v]\n\t"
		"2:\n\t"
		RSEQ_INJECT_ASM(6)
		/* teardown */
		LONG_L " %[len], %[rseq_scratch2]\n\t"
		LONG_L " %[dst], %[rseq_scratch1]\n\t"
		LONG_L " %[src], %[rseq_scratch0]\n\t"
		"b 8f\n\t"
		RSEQ_ASM_DEFINE_ABORT(3, 4,
				      /* teardown */
				      LONG_L " %[len], %[rseq_scratch2]\n\t"
				      LONG_L " %[dst], %[rseq_scratch1]\n\t"
				      LONG_L " %[src], %[rseq_scratch0]\n\t",
				      abort, 1b, 2b, 4f)
		RSEQ_ASM_DEFINE_CMPFAIL(5,
					/* teardown */
					LONG_L " %[len], %[rseq_scratch2]\n\t"
					LONG_L " %[dst], %[rseq_scratch1]\n\t"
					LONG_L " %[src], %[rseq_scratch0]\n\t",
					cmpfail)
#ifdef RSEQ_COMPARE_TWICE
		RSEQ_ASM_DEFINE_CMPFAIL(6,
					/* teardown */
					LONG_L " %[len], %[rseq_scratch2]\n\t"
					LONG_L " %[dst], %[rseq_scratch1]\n\t"
					LONG_L " %[src], %[rseq_scratch0]\n\t",
					error1)
		RSEQ_ASM_DEFINE_CMPFAIL(7,
					/* teardown */
					LONG_L " %[len], %[rseq_scratch2]\n\t"
					LONG_L " %[dst], %[rseq_scratch1]\n\t"
					LONG_L " %[src], %[rseq_scratch0]\n\t",
					error2)
#endif
		"8:\n\t"
		: /* gcc asm goto does not allow outputs */
		: [cpu_id]		"r" (cpu),
		  [current_cpu_id]	"m" (rseq_get_abi()->cpu_id),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  /* final store input */
		  [v]			"m" (*v),
		  [expect]		"r" (expect),
		  [newv]		"r" (newv),
		  /* try memcpy input */
		  [dst]			"r" (dst),
		  [src]			"r" (src),
		  [len]			"r" (len),
		  [rseq_scratch0]	"m" (rseq_scratch[0]),
		  [rseq_scratch1]	"m" (rseq_scratch[1]),
		  [rseq_scratch2]	"m" (rseq_scratch[2])
		  RSEQ_INJECT_INPUT
		: "$4", "memory"
		  RSEQ_INJECT_CLOBBER
		: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
		  , error1, error2
#endif
	);
	return 0;
abort:
	RSEQ_INJECT_FAILED
	return -1;
cmpfail:
	return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
	rseq_bug("cpu_id comparison failed");
error2:
	rseq_bug("expected value comparison failed");
#endif
}

#endif /* !RSEQ_SKIP_FASTPATH */