Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  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
// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * arch/arm/probes/decode-arm.c
 *
 * Some code moved here from arch/arm/kernel/kprobes-arm.c
 *
 * Copyright (C) 2006, 2007 Motorola Inc.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/ptrace.h>

#include "decode.h"
#include "decode-arm.h"

#define sign_extend(x, signbit) ((x) | (0 - ((x) & (1 << (signbit)))))

#define branch_displacement(insn) sign_extend(((insn) & 0xffffff) << 2, 25)

/*
 * To avoid the complications of mimicing single-stepping on a
 * processor without a Next-PC or a single-step mode, and to
 * avoid having to deal with the side-effects of boosting, we
 * simulate or emulate (almost) all ARM instructions.
 *
 * "Simulation" is where the instruction's behavior is duplicated in
 * C code.  "Emulation" is where the original instruction is rewritten
 * and executed, often by altering its registers.
 *
 * By having all behavior of the kprobe'd instruction completed before
 * returning from the kprobe_handler(), all locks (scheduler and
 * interrupt) can safely be released.  There is no need for secondary
 * breakpoints, no race with MP or preemptable kernels, nor having to
 * clean up resources counts at a later time impacting overall system
 * performance.  By rewriting the instruction, only the minimum registers
 * need to be loaded and saved back optimizing performance.
 *
 * Calling the insnslot_*_rwflags version of a function doesn't hurt
 * anything even when the CPSR flags aren't updated by the
 * instruction.  It's just a little slower in return for saving
 * a little space by not having a duplicate function that doesn't
 * update the flags.  (The same optimization can be said for
 * instructions that do or don't perform register writeback)
 * Also, instructions can either read the flags, only write the
 * flags, or read and write the flags.  To save combinations
 * rather than for sheer performance, flag functions just assume
 * read and write of flags.
 */

void __kprobes simulate_bbl(probes_opcode_t insn,
		struct arch_probes_insn *asi, struct pt_regs *regs)
{
	long iaddr = (long) regs->ARM_pc - 4;
	int disp  = branch_displacement(insn);

	if (insn & (1 << 24))
		regs->ARM_lr = iaddr + 4;

	regs->ARM_pc = iaddr + 8 + disp;
}

void __kprobes simulate_blx1(probes_opcode_t insn,
		struct arch_probes_insn *asi, struct pt_regs *regs)
{
	long iaddr = (long) regs->ARM_pc - 4;
	int disp = branch_displacement(insn);

	regs->ARM_lr = iaddr + 4;
	regs->ARM_pc = iaddr + 8 + disp + ((insn >> 23) & 0x2);
	regs->ARM_cpsr |= PSR_T_BIT;
}

void __kprobes simulate_blx2bx(probes_opcode_t insn,
		struct arch_probes_insn *asi, struct pt_regs *regs)
{
	int rm = insn & 0xf;
	long rmv = regs->uregs[rm];

	if (insn & (1 << 5))
		regs->ARM_lr = (long) regs->ARM_pc;

	regs->ARM_pc = rmv & ~0x1;
	regs->ARM_cpsr &= ~PSR_T_BIT;
	if (rmv & 0x1)
		regs->ARM_cpsr |= PSR_T_BIT;
}

void __kprobes simulate_mrs(probes_opcode_t insn,
		struct arch_probes_insn *asi, struct pt_regs *regs)
{
	int rd = (insn >> 12) & 0xf;
	unsigned long mask = 0xf8ff03df; /* Mask out execution state */
	regs->uregs[rd] = regs->ARM_cpsr & mask;
}

void __kprobes simulate_mov_ipsp(probes_opcode_t insn,
		struct arch_probes_insn *asi, struct pt_regs *regs)
{
	regs->uregs[12] = regs->uregs[13];
}

/*
 * For the instruction masking and comparisons in all the "space_*"
 * functions below, Do _not_ rearrange the order of tests unless
 * you're very, very sure of what you are doing.  For the sake of
 * efficiency, the masks for some tests sometimes assume other test
 * have been done prior to them so the number of patterns to test
 * for an instruction set can be as broad as possible to reduce the
 * number of tests needed.
 */

static const union decode_item arm_1111_table[] = {
	/* Unconditional instructions					*/

	/* memory hint		1111 0100 x001 xxxx xxxx xxxx xxxx xxxx */
	/* PLDI (immediate)	1111 0100 x101 xxxx xxxx xxxx xxxx xxxx */
	/* PLDW (immediate)	1111 0101 x001 xxxx xxxx xxxx xxxx xxxx */
	/* PLD (immediate)	1111 0101 x101 xxxx xxxx xxxx xxxx xxxx */
	DECODE_SIMULATE	(0xfe300000, 0xf4100000, PROBES_PRELOAD_IMM),

	/* memory hint		1111 0110 x001 xxxx xxxx xxxx xxx0 xxxx */
	/* PLDI (register)	1111 0110 x101 xxxx xxxx xxxx xxx0 xxxx */
	/* PLDW (register)	1111 0111 x001 xxxx xxxx xxxx xxx0 xxxx */
	/* PLD (register)	1111 0111 x101 xxxx xxxx xxxx xxx0 xxxx */
	DECODE_SIMULATE	(0xfe300010, 0xf6100000, PROBES_PRELOAD_REG),

	/* BLX (immediate)	1111 101x xxxx xxxx xxxx xxxx xxxx xxxx */
	DECODE_SIMULATE	(0xfe000000, 0xfa000000, PROBES_BRANCH_IMM),

	/* CPS			1111 0001 0000 xxx0 xxxx xxxx xx0x xxxx */
	/* SETEND		1111 0001 0000 0001 xxxx xxxx 0000 xxxx */
	/* SRS			1111 100x x1x0 xxxx xxxx xxxx xxxx xxxx */
	/* RFE			1111 100x x0x1 xxxx xxxx xxxx xxxx xxxx */

	/* Coprocessor instructions... */
	/* MCRR2		1111 1100 0100 xxxx xxxx xxxx xxxx xxxx */
	/* MRRC2		1111 1100 0101 xxxx xxxx xxxx xxxx xxxx */
	/* LDC2			1111 110x xxx1 xxxx xxxx xxxx xxxx xxxx */
	/* STC2			1111 110x xxx0 xxxx xxxx xxxx xxxx xxxx */
	/* CDP2			1111 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */
	/* MCR2			1111 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */
	/* MRC2			1111 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */

	/* Other unallocated instructions...				*/
	DECODE_END
};

static const union decode_item arm_cccc_0001_0xx0____0xxx_table[] = {
	/* Miscellaneous instructions					*/

	/* MRS cpsr		cccc 0001 0000 xxxx xxxx xxxx 0000 xxxx */
	DECODE_SIMULATEX(0x0ff000f0, 0x01000000, PROBES_MRS,
						 REGS(0, NOPC, 0, 0, 0)),

	/* BX			cccc 0001 0010 xxxx xxxx xxxx 0001 xxxx */
	DECODE_SIMULATE	(0x0ff000f0, 0x01200010, PROBES_BRANCH_REG),

	/* BLX (register)	cccc 0001 0010 xxxx xxxx xxxx 0011 xxxx */
	DECODE_SIMULATEX(0x0ff000f0, 0x01200030, PROBES_BRANCH_REG,
						 REGS(0, 0, 0, 0, NOPC)),

	/* CLZ			cccc 0001 0110 xxxx xxxx xxxx 0001 xxxx */
	DECODE_EMULATEX	(0x0ff000f0, 0x01600010, PROBES_CLZ,
						 REGS(0, NOPC, 0, 0, NOPC)),

	/* QADD			cccc 0001 0000 xxxx xxxx xxxx 0101 xxxx */
	/* QSUB			cccc 0001 0010 xxxx xxxx xxxx 0101 xxxx */
	/* QDADD		cccc 0001 0100 xxxx xxxx xxxx 0101 xxxx */
	/* QDSUB		cccc 0001 0110 xxxx xxxx xxxx 0101 xxxx */
	DECODE_EMULATEX	(0x0f9000f0, 0x01000050, PROBES_SATURATING_ARITHMETIC,
						 REGS(NOPC, NOPC, 0, 0, NOPC)),

	/* BXJ			cccc 0001 0010 xxxx xxxx xxxx 0010 xxxx */
	/* MSR			cccc 0001 0x10 xxxx xxxx xxxx 0000 xxxx */
	/* MRS spsr		cccc 0001 0100 xxxx xxxx xxxx 0000 xxxx */
	/* BKPT			1110 0001 0010 xxxx xxxx xxxx 0111 xxxx */
	/* SMC			cccc 0001 0110 xxxx xxxx xxxx 0111 xxxx */
	/* And unallocated instructions...				*/
	DECODE_END
};

static const union decode_item arm_cccc_0001_0xx0____1xx0_table[] = {
	/* Halfword multiply and multiply-accumulate			*/

	/* SMLALxy		cccc 0001 0100 xxxx xxxx xxxx 1xx0 xxxx */
	DECODE_EMULATEX	(0x0ff00090, 0x01400080, PROBES_MUL1,
						 REGS(NOPC, NOPC, NOPC, 0, NOPC)),

	/* SMULWy		cccc 0001 0010 xxxx xxxx xxxx 1x10 xxxx */
	DECODE_OR	(0x0ff000b0, 0x012000a0),
	/* SMULxy		cccc 0001 0110 xxxx xxxx xxxx 1xx0 xxxx */
	DECODE_EMULATEX	(0x0ff00090, 0x01600080, PROBES_MUL2,
						 REGS(NOPC, 0, NOPC, 0, NOPC)),

	/* SMLAxy		cccc 0001 0000 xxxx xxxx xxxx 1xx0 xxxx */
	DECODE_OR	(0x0ff00090, 0x01000080),
	/* SMLAWy		cccc 0001 0010 xxxx xxxx xxxx 1x00 xxxx */
	DECODE_EMULATEX	(0x0ff000b0, 0x01200080, PROBES_MUL2,
						 REGS(NOPC, NOPC, NOPC, 0, NOPC)),

	DECODE_END
};

static const union decode_item arm_cccc_0000_____1001_table[] = {
	/* Multiply and multiply-accumulate				*/

	/* MUL			cccc 0000 0000 xxxx xxxx xxxx 1001 xxxx */
	/* MULS			cccc 0000 0001 xxxx xxxx xxxx 1001 xxxx */
	DECODE_EMULATEX	(0x0fe000f0, 0x00000090, PROBES_MUL2,
						 REGS(NOPC, 0, NOPC, 0, NOPC)),

	/* MLA			cccc 0000 0010 xxxx xxxx xxxx 1001 xxxx */
	/* MLAS			cccc 0000 0011 xxxx xxxx xxxx 1001 xxxx */
	DECODE_OR	(0x0fe000f0, 0x00200090),
	/* MLS			cccc 0000 0110 xxxx xxxx xxxx 1001 xxxx */
	DECODE_EMULATEX	(0x0ff000f0, 0x00600090, PROBES_MUL2,
						 REGS(NOPC, NOPC, NOPC, 0, NOPC)),

	/* UMAAL		cccc 0000 0100 xxxx xxxx xxxx 1001 xxxx */
	DECODE_OR	(0x0ff000f0, 0x00400090),
	/* UMULL		cccc 0000 1000 xxxx xxxx xxxx 1001 xxxx */
	/* UMULLS		cccc 0000 1001 xxxx xxxx xxxx 1001 xxxx */
	/* UMLAL		cccc 0000 1010 xxxx xxxx xxxx 1001 xxxx */
	/* UMLALS		cccc 0000 1011 xxxx xxxx xxxx 1001 xxxx */
	/* SMULL		cccc 0000 1100 xxxx xxxx xxxx 1001 xxxx */
	/* SMULLS		cccc 0000 1101 xxxx xxxx xxxx 1001 xxxx */
	/* SMLAL		cccc 0000 1110 xxxx xxxx xxxx 1001 xxxx */
	/* SMLALS		cccc 0000 1111 xxxx xxxx xxxx 1001 xxxx */
	DECODE_EMULATEX	(0x0f8000f0, 0x00800090, PROBES_MUL1,
						 REGS(NOPC, NOPC, NOPC, 0, NOPC)),

	DECODE_END
};

static const union decode_item arm_cccc_0001_____1001_table[] = {
	/* Synchronization primitives					*/

#if __LINUX_ARM_ARCH__ < 6
	/* Deprecated on ARMv6 and may be UNDEFINED on v7		*/
	/* SMP/SWPB		cccc 0001 0x00 xxxx xxxx xxxx 1001 xxxx */
	DECODE_EMULATEX	(0x0fb000f0, 0x01000090, PROBES_SWP,
						 REGS(NOPC, NOPC, 0, 0, NOPC)),
#endif
	/* LDREX/STREX{,D,B,H}	cccc 0001 1xxx xxxx xxxx xxxx 1001 xxxx */
	/* And unallocated instructions...				*/
	DECODE_END
};

static const union decode_item arm_cccc_000x_____1xx1_table[] = {
	/* Extra load/store instructions				*/

	/* STRHT		cccc 0000 xx10 xxxx xxxx xxxx 1011 xxxx */
	/* ???			cccc 0000 xx10 xxxx xxxx xxxx 11x1 xxxx */
	/* LDRHT		cccc 0000 xx11 xxxx xxxx xxxx 1011 xxxx */
	/* LDRSBT		cccc 0000 xx11 xxxx xxxx xxxx 1101 xxxx */
	/* LDRSHT		cccc 0000 xx11 xxxx xxxx xxxx 1111 xxxx */
	DECODE_REJECT	(0x0f200090, 0x00200090),

	/* LDRD/STRD lr,pc,{...	cccc 000x x0x0 xxxx 111x xxxx 1101 xxxx */
	DECODE_REJECT	(0x0e10e0d0, 0x0000e0d0),

	/* LDRD (register)	cccc 000x x0x0 xxxx xxxx xxxx 1101 xxxx */
	/* STRD (register)	cccc 000x x0x0 xxxx xxxx xxxx 1111 xxxx */
	DECODE_EMULATEX	(0x0e5000d0, 0x000000d0, PROBES_LDRSTRD,
						 REGS(NOPCWB, NOPCX, 0, 0, NOPC)),

	/* LDRD (immediate)	cccc 000x x1x0 xxxx xxxx xxxx 1101 xxxx */
	/* STRD (immediate)	cccc 000x x1x0 xxxx xxxx xxxx 1111 xxxx */
	DECODE_EMULATEX	(0x0e5000d0, 0x004000d0, PROBES_LDRSTRD,
						 REGS(NOPCWB, NOPCX, 0, 0, 0)),

	/* STRH (register)	cccc 000x x0x0 xxxx xxxx xxxx 1011 xxxx */
	DECODE_EMULATEX	(0x0e5000f0, 0x000000b0, PROBES_STORE_EXTRA,
						 REGS(NOPCWB, NOPC, 0, 0, NOPC)),

	/* LDRH (register)	cccc 000x x0x1 xxxx xxxx xxxx 1011 xxxx */
	/* LDRSB (register)	cccc 000x x0x1 xxxx xxxx xxxx 1101 xxxx */
	/* LDRSH (register)	cccc 000x x0x1 xxxx xxxx xxxx 1111 xxxx */
	DECODE_EMULATEX	(0x0e500090, 0x00100090, PROBES_LOAD_EXTRA,
						 REGS(NOPCWB, NOPC, 0, 0, NOPC)),

	/* STRH (immediate)	cccc 000x x1x0 xxxx xxxx xxxx 1011 xxxx */
	DECODE_EMULATEX	(0x0e5000f0, 0x004000b0, PROBES_STORE_EXTRA,
						 REGS(NOPCWB, NOPC, 0, 0, 0)),

	/* LDRH (immediate)	cccc 000x x1x1 xxxx xxxx xxxx 1011 xxxx */
	/* LDRSB (immediate)	cccc 000x x1x1 xxxx xxxx xxxx 1101 xxxx */
	/* LDRSH (immediate)	cccc 000x x1x1 xxxx xxxx xxxx 1111 xxxx */
	DECODE_EMULATEX	(0x0e500090, 0x00500090, PROBES_LOAD_EXTRA,
						 REGS(NOPCWB, NOPC, 0, 0, 0)),

	DECODE_END
};

static const union decode_item arm_cccc_000x_table[] = {
	/* Data-processing (register)					*/

	/* <op>S PC, ...	cccc 000x xxx1 xxxx 1111 xxxx xxxx xxxx */
	DECODE_REJECT	(0x0e10f000, 0x0010f000),

	/* MOV IP, SP		1110 0001 1010 0000 1100 0000 0000 1101 */
	DECODE_SIMULATE	(0xffffffff, 0xe1a0c00d, PROBES_MOV_IP_SP),

	/* TST (register)	cccc 0001 0001 xxxx xxxx xxxx xxx0 xxxx */
	/* TEQ (register)	cccc 0001 0011 xxxx xxxx xxxx xxx0 xxxx */
	/* CMP (register)	cccc 0001 0101 xxxx xxxx xxxx xxx0 xxxx */
	/* CMN (register)	cccc 0001 0111 xxxx xxxx xxxx xxx0 xxxx */
	DECODE_EMULATEX	(0x0f900010, 0x01100000, PROBES_DATA_PROCESSING_REG,
						 REGS(ANY, 0, 0, 0, ANY)),

	/* MOV (register)	cccc 0001 101x xxxx xxxx xxxx xxx0 xxxx */
	/* MVN (register)	cccc 0001 111x xxxx xxxx xxxx xxx0 xxxx */
	DECODE_EMULATEX	(0x0fa00010, 0x01a00000, PROBES_DATA_PROCESSING_REG,
						 REGS(0, ANY, 0, 0, ANY)),

	/* AND (register)	cccc 0000 000x xxxx xxxx xxxx xxx0 xxxx */
	/* EOR (register)	cccc 0000 001x xxxx xxxx xxxx xxx0 xxxx */
	/* SUB (register)	cccc 0000 010x xxxx xxxx xxxx xxx0 xxxx */
	/* RSB (register)	cccc 0000 011x xxxx xxxx xxxx xxx0 xxxx */
	/* ADD (register)	cccc 0000 100x xxxx xxxx xxxx xxx0 xxxx */
	/* ADC (register)	cccc 0000 101x xxxx xxxx xxxx xxx0 xxxx */
	/* SBC (register)	cccc 0000 110x xxxx xxxx xxxx xxx0 xxxx */
	/* RSC (register)	cccc 0000 111x xxxx xxxx xxxx xxx0 xxxx */
	/* ORR (register)	cccc 0001 100x xxxx xxxx xxxx xxx0 xxxx */
	/* BIC (register)	cccc 0001 110x xxxx xxxx xxxx xxx0 xxxx */
	DECODE_EMULATEX	(0x0e000010, 0x00000000, PROBES_DATA_PROCESSING_REG,
						 REGS(ANY, ANY, 0, 0, ANY)),

	/* TST (reg-shift reg)	cccc 0001 0001 xxxx xxxx xxxx 0xx1 xxxx */
	/* TEQ (reg-shift reg)	cccc 0001 0011 xxxx xxxx xxxx 0xx1 xxxx */
	/* CMP (reg-shift reg)	cccc 0001 0101 xxxx xxxx xxxx 0xx1 xxxx */
	/* CMN (reg-shift reg)	cccc 0001 0111 xxxx xxxx xxxx 0xx1 xxxx */
	DECODE_EMULATEX	(0x0f900090, 0x01100010, PROBES_DATA_PROCESSING_REG,
						 REGS(NOPC, 0, NOPC, 0, NOPC)),

	/* MOV (reg-shift reg)	cccc 0001 101x xxxx xxxx xxxx 0xx1 xxxx */
	/* MVN (reg-shift reg)	cccc 0001 111x xxxx xxxx xxxx 0xx1 xxxx */
	DECODE_EMULATEX	(0x0fa00090, 0x01a00010, PROBES_DATA_PROCESSING_REG,
						 REGS(0, NOPC, NOPC, 0, NOPC)),

	/* AND (reg-shift reg)	cccc 0000 000x xxxx xxxx xxxx 0xx1 xxxx */
	/* EOR (reg-shift reg)	cccc 0000 001x xxxx xxxx xxxx 0xx1 xxxx */
	/* SUB (reg-shift reg)	cccc 0000 010x xxxx xxxx xxxx 0xx1 xxxx */
	/* RSB (reg-shift reg)	cccc 0000 011x xxxx xxxx xxxx 0xx1 xxxx */
	/* ADD (reg-shift reg)	cccc 0000 100x xxxx xxxx xxxx 0xx1 xxxx */
	/* ADC (reg-shift reg)	cccc 0000 101x xxxx xxxx xxxx 0xx1 xxxx */
	/* SBC (reg-shift reg)	cccc 0000 110x xxxx xxxx xxxx 0xx1 xxxx */
	/* RSC (reg-shift reg)	cccc 0000 111x xxxx xxxx xxxx 0xx1 xxxx */
	/* ORR (reg-shift reg)	cccc 0001 100x xxxx xxxx xxxx 0xx1 xxxx */
	/* BIC (reg-shift reg)	cccc 0001 110x xxxx xxxx xxxx 0xx1 xxxx */
	DECODE_EMULATEX	(0x0e000090, 0x00000010, PROBES_DATA_PROCESSING_REG,
						 REGS(NOPC, NOPC, NOPC, 0, NOPC)),

	DECODE_END
};

static const union decode_item arm_cccc_001x_table[] = {
	/* Data-processing (immediate)					*/

	/* MOVW			cccc 0011 0000 xxxx xxxx xxxx xxxx xxxx */
	/* MOVT			cccc 0011 0100 xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0x0fb00000, 0x03000000, PROBES_MOV_HALFWORD,
						 REGS(0, NOPC, 0, 0, 0)),

	/* YIELD		cccc 0011 0010 0000 xxxx xxxx 0000 0001 */
	DECODE_OR	(0x0fff00ff, 0x03200001),
	/* SEV			cccc 0011 0010 0000 xxxx xxxx 0000 0100 */
	DECODE_EMULATE	(0x0fff00ff, 0x03200004, PROBES_SEV),
	/* NOP			cccc 0011 0010 0000 xxxx xxxx 0000 0000 */
	/* WFE			cccc 0011 0010 0000 xxxx xxxx 0000 0010 */
	/* WFI			cccc 0011 0010 0000 xxxx xxxx 0000 0011 */
	DECODE_SIMULATE	(0x0fff00fc, 0x03200000, PROBES_WFE),
	/* DBG			cccc 0011 0010 0000 xxxx xxxx ffff xxxx */
	/* unallocated hints	cccc 0011 0010 0000 xxxx xxxx xxxx xxxx */
	/* MSR (immediate)	cccc 0011 0x10 xxxx xxxx xxxx xxxx xxxx */
	DECODE_REJECT	(0x0fb00000, 0x03200000),

	/* <op>S PC, ...	cccc 001x xxx1 xxxx 1111 xxxx xxxx xxxx */
	DECODE_REJECT	(0x0e10f000, 0x0210f000),

	/* TST (immediate)	cccc 0011 0001 xxxx xxxx xxxx xxxx xxxx */
	/* TEQ (immediate)	cccc 0011 0011 xxxx xxxx xxxx xxxx xxxx */
	/* CMP (immediate)	cccc 0011 0101 xxxx xxxx xxxx xxxx xxxx */
	/* CMN (immediate)	cccc 0011 0111 xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0x0f900000, 0x03100000, PROBES_DATA_PROCESSING_IMM,
						 REGS(ANY, 0, 0, 0, 0)),

	/* MOV (immediate)	cccc 0011 101x xxxx xxxx xxxx xxxx xxxx */
	/* MVN (immediate)	cccc 0011 111x xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0x0fa00000, 0x03a00000, PROBES_DATA_PROCESSING_IMM,
						 REGS(0, ANY, 0, 0, 0)),

	/* AND (immediate)	cccc 0010 000x xxxx xxxx xxxx xxxx xxxx */
	/* EOR (immediate)	cccc 0010 001x xxxx xxxx xxxx xxxx xxxx */
	/* SUB (immediate)	cccc 0010 010x xxxx xxxx xxxx xxxx xxxx */
	/* RSB (immediate)	cccc 0010 011x xxxx xxxx xxxx xxxx xxxx */
	/* ADD (immediate)	cccc 0010 100x xxxx xxxx xxxx xxxx xxxx */
	/* ADC (immediate)	cccc 0010 101x xxxx xxxx xxxx xxxx xxxx */
	/* SBC (immediate)	cccc 0010 110x xxxx xxxx xxxx xxxx xxxx */
	/* RSC (immediate)	cccc 0010 111x xxxx xxxx xxxx xxxx xxxx */
	/* ORR (immediate)	cccc 0011 100x xxxx xxxx xxxx xxxx xxxx */
	/* BIC (immediate)	cccc 0011 110x xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0x0e000000, 0x02000000, PROBES_DATA_PROCESSING_IMM,
						 REGS(ANY, ANY, 0, 0, 0)),

	DECODE_END
};

static const union decode_item arm_cccc_0110_____xxx1_table[] = {
	/* Media instructions						*/

	/* SEL			cccc 0110 1000 xxxx xxxx xxxx 1011 xxxx */
	DECODE_EMULATEX	(0x0ff000f0, 0x068000b0, PROBES_SATURATE,
						 REGS(NOPC, NOPC, 0, 0, NOPC)),

	/* SSAT			cccc 0110 101x xxxx xxxx xxxx xx01 xxxx */
	/* USAT			cccc 0110 111x xxxx xxxx xxxx xx01 xxxx */
	DECODE_OR(0x0fa00030, 0x06a00010),
	/* SSAT16		cccc 0110 1010 xxxx xxxx xxxx 0011 xxxx */
	/* USAT16		cccc 0110 1110 xxxx xxxx xxxx 0011 xxxx */
	DECODE_EMULATEX	(0x0fb000f0, 0x06a00030, PROBES_SATURATE,
						 REGS(0, NOPC, 0, 0, NOPC)),

	/* REV			cccc 0110 1011 xxxx xxxx xxxx 0011 xxxx */
	/* REV16		cccc 0110 1011 xxxx xxxx xxxx 1011 xxxx */
	/* RBIT			cccc 0110 1111 xxxx xxxx xxxx 0011 xxxx */
	/* REVSH		cccc 0110 1111 xxxx xxxx xxxx 1011 xxxx */
	DECODE_EMULATEX	(0x0fb00070, 0x06b00030, PROBES_REV,
						 REGS(0, NOPC, 0, 0, NOPC)),

	/* ???			cccc 0110 0x00 xxxx xxxx xxxx xxx1 xxxx */
	DECODE_REJECT	(0x0fb00010, 0x06000010),
	/* ???			cccc 0110 0xxx xxxx xxxx xxxx 1011 xxxx */
	DECODE_REJECT	(0x0f8000f0, 0x060000b0),
	/* ???			cccc 0110 0xxx xxxx xxxx xxxx 1101 xxxx */
	DECODE_REJECT	(0x0f8000f0, 0x060000d0),
	/* SADD16		cccc 0110 0001 xxxx xxxx xxxx 0001 xxxx */
	/* SADDSUBX		cccc 0110 0001 xxxx xxxx xxxx 0011 xxxx */
	/* SSUBADDX		cccc 0110 0001 xxxx xxxx xxxx 0101 xxxx */
	/* SSUB16		cccc 0110 0001 xxxx xxxx xxxx 0111 xxxx */
	/* SADD8		cccc 0110 0001 xxxx xxxx xxxx 1001 xxxx */
	/* SSUB8		cccc 0110 0001 xxxx xxxx xxxx 1111 xxxx */
	/* QADD16		cccc 0110 0010 xxxx xxxx xxxx 0001 xxxx */
	/* QADDSUBX		cccc 0110 0010 xxxx xxxx xxxx 0011 xxxx */
	/* QSUBADDX		cccc 0110 0010 xxxx xxxx xxxx 0101 xxxx */
	/* QSUB16		cccc 0110 0010 xxxx xxxx xxxx 0111 xxxx */
	/* QADD8		cccc 0110 0010 xxxx xxxx xxxx 1001 xxxx */
	/* QSUB8		cccc 0110 0010 xxxx xxxx xxxx 1111 xxxx */
	/* SHADD16		cccc 0110 0011 xxxx xxxx xxxx 0001 xxxx */
	/* SHADDSUBX		cccc 0110 0011 xxxx xxxx xxxx 0011 xxxx */
	/* SHSUBADDX		cccc 0110 0011 xxxx xxxx xxxx 0101 xxxx */
	/* SHSUB16		cccc 0110 0011 xxxx xxxx xxxx 0111 xxxx */
	/* SHADD8		cccc 0110 0011 xxxx xxxx xxxx 1001 xxxx */
	/* SHSUB8		cccc 0110 0011 xxxx xxxx xxxx 1111 xxxx */
	/* UADD16		cccc 0110 0101 xxxx xxxx xxxx 0001 xxxx */
	/* UADDSUBX		cccc 0110 0101 xxxx xxxx xxxx 0011 xxxx */
	/* USUBADDX		cccc 0110 0101 xxxx xxxx xxxx 0101 xxxx */
	/* USUB16		cccc 0110 0101 xxxx xxxx xxxx 0111 xxxx */
	/* UADD8		cccc 0110 0101 xxxx xxxx xxxx 1001 xxxx */
	/* USUB8		cccc 0110 0101 xxxx xxxx xxxx 1111 xxxx */
	/* UQADD16		cccc 0110 0110 xxxx xxxx xxxx 0001 xxxx */
	/* UQADDSUBX		cccc 0110 0110 xxxx xxxx xxxx 0011 xxxx */
	/* UQSUBADDX		cccc 0110 0110 xxxx xxxx xxxx 0101 xxxx */
	/* UQSUB16		cccc 0110 0110 xxxx xxxx xxxx 0111 xxxx */
	/* UQADD8		cccc 0110 0110 xxxx xxxx xxxx 1001 xxxx */
	/* UQSUB8		cccc 0110 0110 xxxx xxxx xxxx 1111 xxxx */
	/* UHADD16		cccc 0110 0111 xxxx xxxx xxxx 0001 xxxx */
	/* UHADDSUBX		cccc 0110 0111 xxxx xxxx xxxx 0011 xxxx */
	/* UHSUBADDX		cccc 0110 0111 xxxx xxxx xxxx 0101 xxxx */
	/* UHSUB16		cccc 0110 0111 xxxx xxxx xxxx 0111 xxxx */
	/* UHADD8		cccc 0110 0111 xxxx xxxx xxxx 1001 xxxx */
	/* UHSUB8		cccc 0110 0111 xxxx xxxx xxxx 1111 xxxx */
	DECODE_EMULATEX	(0x0f800010, 0x06000010, PROBES_MMI,
						 REGS(NOPC, NOPC, 0, 0, NOPC)),

	/* PKHBT		cccc 0110 1000 xxxx xxxx xxxx x001 xxxx */
	/* PKHTB		cccc 0110 1000 xxxx xxxx xxxx x101 xxxx */
	DECODE_EMULATEX	(0x0ff00030, 0x06800010, PROBES_PACK,
						 REGS(NOPC, NOPC, 0, 0, NOPC)),

	/* ???			cccc 0110 1001 xxxx xxxx xxxx 0111 xxxx */
	/* ???			cccc 0110 1101 xxxx xxxx xxxx 0111 xxxx */
	DECODE_REJECT	(0x0fb000f0, 0x06900070),

	/* SXTB16		cccc 0110 1000 1111 xxxx xxxx 0111 xxxx */
	/* SXTB			cccc 0110 1010 1111 xxxx xxxx 0111 xxxx */
	/* SXTH			cccc 0110 1011 1111 xxxx xxxx 0111 xxxx */
	/* UXTB16		cccc 0110 1100 1111 xxxx xxxx 0111 xxxx */
	/* UXTB			cccc 0110 1110 1111 xxxx xxxx 0111 xxxx */
	/* UXTH			cccc 0110 1111 1111 xxxx xxxx 0111 xxxx */
	DECODE_EMULATEX	(0x0f8f00f0, 0x068f0070, PROBES_EXTEND,
						 REGS(0, NOPC, 0, 0, NOPC)),

	/* SXTAB16		cccc 0110 1000 xxxx xxxx xxxx 0111 xxxx */
	/* SXTAB		cccc 0110 1010 xxxx xxxx xxxx 0111 xxxx */
	/* SXTAH		cccc 0110 1011 xxxx xxxx xxxx 0111 xxxx */
	/* UXTAB16		cccc 0110 1100 xxxx xxxx xxxx 0111 xxxx */
	/* UXTAB		cccc 0110 1110 xxxx xxxx xxxx 0111 xxxx */
	/* UXTAH		cccc 0110 1111 xxxx xxxx xxxx 0111 xxxx */
	DECODE_EMULATEX	(0x0f8000f0, 0x06800070, PROBES_EXTEND_ADD,
						 REGS(NOPCX, NOPC, 0, 0, NOPC)),

	DECODE_END
};

static const union decode_item arm_cccc_0111_____xxx1_table[] = {
	/* Media instructions						*/

	/* UNDEFINED		cccc 0111 1111 xxxx xxxx xxxx 1111 xxxx */
	DECODE_REJECT	(0x0ff000f0, 0x07f000f0),

	/* SMLALD		cccc 0111 0100 xxxx xxxx xxxx 00x1 xxxx */
	/* SMLSLD		cccc 0111 0100 xxxx xxxx xxxx 01x1 xxxx */
	DECODE_EMULATEX	(0x0ff00090, 0x07400010, PROBES_MUL_ADD_LONG,
						 REGS(NOPC, NOPC, NOPC, 0, NOPC)),

	/* SMUAD		cccc 0111 0000 xxxx 1111 xxxx 00x1 xxxx */
	/* SMUSD		cccc 0111 0000 xxxx 1111 xxxx 01x1 xxxx */
	DECODE_OR	(0x0ff0f090, 0x0700f010),
	/* SMMUL		cccc 0111 0101 xxxx 1111 xxxx 00x1 xxxx */
	DECODE_OR	(0x0ff0f0d0, 0x0750f010),
	/* USAD8		cccc 0111 1000 xxxx 1111 xxxx 0001 xxxx */
	DECODE_EMULATEX	(0x0ff0f0f0, 0x0780f010, PROBES_MUL_ADD,
						 REGS(NOPC, 0, NOPC, 0, NOPC)),

	/* SMLAD		cccc 0111 0000 xxxx xxxx xxxx 00x1 xxxx */
	/* SMLSD		cccc 0111 0000 xxxx xxxx xxxx 01x1 xxxx */
	DECODE_OR	(0x0ff00090, 0x07000010),
	/* SMMLA		cccc 0111 0101 xxxx xxxx xxxx 00x1 xxxx */
	DECODE_OR	(0x0ff000d0, 0x07500010),
	/* USADA8		cccc 0111 1000 xxxx xxxx xxxx 0001 xxxx */
	DECODE_EMULATEX	(0x0ff000f0, 0x07800010, PROBES_MUL_ADD,
						 REGS(NOPC, NOPCX, NOPC, 0, NOPC)),

	/* SMMLS		cccc 0111 0101 xxxx xxxx xxxx 11x1 xxxx */
	DECODE_EMULATEX	(0x0ff000d0, 0x075000d0, PROBES_MUL_ADD,
						 REGS(NOPC, NOPC, NOPC, 0, NOPC)),

	/* SBFX			cccc 0111 101x xxxx xxxx xxxx x101 xxxx */
	/* UBFX			cccc 0111 111x xxxx xxxx xxxx x101 xxxx */
	DECODE_EMULATEX	(0x0fa00070, 0x07a00050, PROBES_BITFIELD,
						 REGS(0, NOPC, 0, 0, NOPC)),

	/* BFC			cccc 0111 110x xxxx xxxx xxxx x001 1111 */
	DECODE_EMULATEX	(0x0fe0007f, 0x07c0001f, PROBES_BITFIELD,
						 REGS(0, NOPC, 0, 0, 0)),

	/* BFI			cccc 0111 110x xxxx xxxx xxxx x001 xxxx */
	DECODE_EMULATEX	(0x0fe00070, 0x07c00010, PROBES_BITFIELD,
						 REGS(0, NOPC, 0, 0, NOPCX)),

	DECODE_END
};

static const union decode_item arm_cccc_01xx_table[] = {
	/* Load/store word and unsigned byte				*/

	/* LDRB/STRB pc,[...]	cccc 01xx x0xx xxxx xxxx xxxx xxxx xxxx */
	DECODE_REJECT	(0x0c40f000, 0x0440f000),

	/* STRT			cccc 01x0 x010 xxxx xxxx xxxx xxxx xxxx */
	/* LDRT			cccc 01x0 x011 xxxx xxxx xxxx xxxx xxxx */
	/* STRBT		cccc 01x0 x110 xxxx xxxx xxxx xxxx xxxx */
	/* LDRBT		cccc 01x0 x111 xxxx xxxx xxxx xxxx xxxx */
	DECODE_REJECT	(0x0d200000, 0x04200000),

	/* STR (immediate)	cccc 010x x0x0 xxxx xxxx xxxx xxxx xxxx */
	/* STRB (immediate)	cccc 010x x1x0 xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0x0e100000, 0x04000000, PROBES_STORE,
						 REGS(NOPCWB, ANY, 0, 0, 0)),

	/* LDR (immediate)	cccc 010x x0x1 xxxx xxxx xxxx xxxx xxxx */
	/* LDRB (immediate)	cccc 010x x1x1 xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0x0e100000, 0x04100000, PROBES_LOAD,
						 REGS(NOPCWB, ANY, 0, 0, 0)),

	/* STR (register)	cccc 011x x0x0 xxxx xxxx xxxx xxxx xxxx */
	/* STRB (register)	cccc 011x x1x0 xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0x0e100000, 0x06000000, PROBES_STORE,
						 REGS(NOPCWB, ANY, 0, 0, NOPC)),

	/* LDR (register)	cccc 011x x0x1 xxxx xxxx xxxx xxxx xxxx */
	/* LDRB (register)	cccc 011x x1x1 xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0x0e100000, 0x06100000, PROBES_LOAD,
						 REGS(NOPCWB, ANY, 0, 0, NOPC)),

	DECODE_END
};

static const union decode_item arm_cccc_100x_table[] = {
	/* Block data transfer instructions				*/

	/* LDM			cccc 100x x0x1 xxxx xxxx xxxx xxxx xxxx */
	/* STM			cccc 100x x0x0 xxxx xxxx xxxx xxxx xxxx */
	DECODE_CUSTOM	(0x0e400000, 0x08000000, PROBES_LDMSTM),

	/* STM (user registers)	cccc 100x x1x0 xxxx xxxx xxxx xxxx xxxx */
	/* LDM (user registers)	cccc 100x x1x1 xxxx 0xxx xxxx xxxx xxxx */
	/* LDM (exception ret)	cccc 100x x1x1 xxxx 1xxx xxxx xxxx xxxx */
	DECODE_END
};

const union decode_item probes_decode_arm_table[] = {
	/*
	 * Unconditional instructions
	 *			1111 xxxx xxxx xxxx xxxx xxxx xxxx xxxx
	 */
	DECODE_TABLE	(0xf0000000, 0xf0000000, arm_1111_table),

	/*
	 * Miscellaneous instructions
	 *			cccc 0001 0xx0 xxxx xxxx xxxx 0xxx xxxx
	 */
	DECODE_TABLE	(0x0f900080, 0x01000000, arm_cccc_0001_0xx0____0xxx_table),

	/*
	 * Halfword multiply and multiply-accumulate
	 *			cccc 0001 0xx0 xxxx xxxx xxxx 1xx0 xxxx
	 */
	DECODE_TABLE	(0x0f900090, 0x01000080, arm_cccc_0001_0xx0____1xx0_table),

	/*
	 * Multiply and multiply-accumulate
	 *			cccc 0000 xxxx xxxx xxxx xxxx 1001 xxxx
	 */
	DECODE_TABLE	(0x0f0000f0, 0x00000090, arm_cccc_0000_____1001_table),

	/*
	 * Synchronization primitives
	 *			cccc 0001 xxxx xxxx xxxx xxxx 1001 xxxx
	 */
	DECODE_TABLE	(0x0f0000f0, 0x01000090, arm_cccc_0001_____1001_table),

	/*
	 * Extra load/store instructions
	 *			cccc 000x xxxx xxxx xxxx xxxx 1xx1 xxxx
	 */
	DECODE_TABLE	(0x0e000090, 0x00000090, arm_cccc_000x_____1xx1_table),

	/*
	 * Data-processing (register)
	 *			cccc 000x xxxx xxxx xxxx xxxx xxx0 xxxx
	 * Data-processing (register-shifted register)
	 *			cccc 000x xxxx xxxx xxxx xxxx 0xx1 xxxx
	 */
	DECODE_TABLE	(0x0e000000, 0x00000000, arm_cccc_000x_table),

	/*
	 * Data-processing (immediate)
	 *			cccc 001x xxxx xxxx xxxx xxxx xxxx xxxx
	 */
	DECODE_TABLE	(0x0e000000, 0x02000000, arm_cccc_001x_table),

	/*
	 * Media instructions
	 *			cccc 011x xxxx xxxx xxxx xxxx xxx1 xxxx
	 */
	DECODE_TABLE	(0x0f000010, 0x06000010, arm_cccc_0110_____xxx1_table),
	DECODE_TABLE	(0x0f000010, 0x07000010, arm_cccc_0111_____xxx1_table),

	/*
	 * Load/store word and unsigned byte
	 *			cccc 01xx xxxx xxxx xxxx xxxx xxxx xxxx
	 */
	DECODE_TABLE	(0x0c000000, 0x04000000, arm_cccc_01xx_table),

	/*
	 * Block data transfer instructions
	 *			cccc 100x xxxx xxxx xxxx xxxx xxxx xxxx
	 */
	DECODE_TABLE	(0x0e000000, 0x08000000, arm_cccc_100x_table),

	/* B			cccc 1010 xxxx xxxx xxxx xxxx xxxx xxxx */
	/* BL			cccc 1011 xxxx xxxx xxxx xxxx xxxx xxxx */
	DECODE_SIMULATE	(0x0e000000, 0x0a000000, PROBES_BRANCH),

	/*
	 * Supervisor Call, and coprocessor instructions
	 */

	/* MCRR			cccc 1100 0100 xxxx xxxx xxxx xxxx xxxx */
	/* MRRC			cccc 1100 0101 xxxx xxxx xxxx xxxx xxxx */
	/* LDC			cccc 110x xxx1 xxxx xxxx xxxx xxxx xxxx */
	/* STC			cccc 110x xxx0 xxxx xxxx xxxx xxxx xxxx */
	/* CDP			cccc 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */
	/* MCR			cccc 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */
	/* MRC			cccc 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */
	/* SVC			cccc 1111 xxxx xxxx xxxx xxxx xxxx xxxx */
	DECODE_REJECT	(0x0c000000, 0x0c000000),

	DECODE_END
};
#ifdef CONFIG_ARM_KPROBES_TEST_MODULE
EXPORT_SYMBOL_GPL(probes_decode_arm_table);
#endif

static void __kprobes arm_singlestep(probes_opcode_t insn,
		struct arch_probes_insn *asi, struct pt_regs *regs)
{
	regs->ARM_pc += 4;
	asi->insn_handler(insn, asi, regs);
}

/* Return:
 *   INSN_REJECTED     If instruction is one not allowed to kprobe,
 *   INSN_GOOD         If instruction is supported and uses instruction slot,
 *   INSN_GOOD_NO_SLOT If instruction is supported but doesn't use its slot.
 *
 * For instructions we don't want to kprobe (INSN_REJECTED return result):
 *   These are generally ones that modify the processor state making
 *   them "hard" to simulate such as switches processor modes or
 *   make accesses in alternate modes.  Any of these could be simulated
 *   if the work was put into it, but low return considering they
 *   should also be very rare.
 */
enum probes_insn __kprobes
arm_probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
		       bool emulate, const union decode_action *actions,
		       const struct decode_checker *checkers[])
{
	asi->insn_singlestep = arm_singlestep;
	asi->insn_check_cc = probes_condition_checks[insn>>28];
	return probes_decode_insn(insn, asi, probes_decode_arm_table, false,
				  emulate, actions, checkers);
}