summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/ptrace/ptrace-view.c
blob: 13208a9a02ca4afc261ec1c3bc87073342b16b65 (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
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
// SPDX-License-Identifier: GPL-2.0-or-later

#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/nospec.h>
#include <linux/pkeys.h>

#include "ptrace-decl.h"

struct pt_regs_offset {
	const char *name;
	int offset;
};

#define STR(s)	#s			/* convert to string */
#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
#define GPR_OFFSET_NAME(num)	\
	{.name = STR(r##num), .offset = offsetof(struct pt_regs, gpr[num])}, \
	{.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
#define REG_OFFSET_END {.name = NULL, .offset = 0}

static const struct pt_regs_offset regoffset_table[] = {
	GPR_OFFSET_NAME(0),
	GPR_OFFSET_NAME(1),
	GPR_OFFSET_NAME(2),
	GPR_OFFSET_NAME(3),
	GPR_OFFSET_NAME(4),
	GPR_OFFSET_NAME(5),
	GPR_OFFSET_NAME(6),
	GPR_OFFSET_NAME(7),
	GPR_OFFSET_NAME(8),
	GPR_OFFSET_NAME(9),
	GPR_OFFSET_NAME(10),
	GPR_OFFSET_NAME(11),
	GPR_OFFSET_NAME(12),
	GPR_OFFSET_NAME(13),
	GPR_OFFSET_NAME(14),
	GPR_OFFSET_NAME(15),
	GPR_OFFSET_NAME(16),
	GPR_OFFSET_NAME(17),
	GPR_OFFSET_NAME(18),
	GPR_OFFSET_NAME(19),
	GPR_OFFSET_NAME(20),
	GPR_OFFSET_NAME(21),
	GPR_OFFSET_NAME(22),
	GPR_OFFSET_NAME(23),
	GPR_OFFSET_NAME(24),
	GPR_OFFSET_NAME(25),
	GPR_OFFSET_NAME(26),
	GPR_OFFSET_NAME(27),
	GPR_OFFSET_NAME(28),
	GPR_OFFSET_NAME(29),
	GPR_OFFSET_NAME(30),
	GPR_OFFSET_NAME(31),
	REG_OFFSET_NAME(nip),
	REG_OFFSET_NAME(msr),
	REG_OFFSET_NAME(ctr),
	REG_OFFSET_NAME(link),
	REG_OFFSET_NAME(xer),
	REG_OFFSET_NAME(ccr),
#ifdef CONFIG_PPC64
	REG_OFFSET_NAME(softe),
#else
	REG_OFFSET_NAME(mq),
#endif
	REG_OFFSET_NAME(trap),
	REG_OFFSET_NAME(dar),
	REG_OFFSET_NAME(dsisr),
	REG_OFFSET_END,
};

/**
 * regs_query_register_offset() - query register offset from its name
 * @name:	the name of a register
 *
 * regs_query_register_offset() returns the offset of a register in struct
 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
 */
int regs_query_register_offset(const char *name)
{
	const struct pt_regs_offset *roff;
	for (roff = regoffset_table; roff->name != NULL; roff++)
		if (!strcmp(roff->name, name))
			return roff->offset;
	return -EINVAL;
}

/**
 * regs_query_register_name() - query register name from its offset
 * @offset:	the offset of a register in struct pt_regs.
 *
 * regs_query_register_name() returns the name of a register from its
 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
 */
const char *regs_query_register_name(unsigned int offset)
{
	const struct pt_regs_offset *roff;
	for (roff = regoffset_table; roff->name != NULL; roff++)
		if (roff->offset == offset)
			return roff->name;
	return NULL;
}

/*
 * does not yet catch signals sent when the child dies.
 * in exit.c or in signal.c.
 */

static unsigned long get_user_msr(struct task_struct *task)
{
	return task->thread.regs->msr | task->thread.fpexc_mode;
}

static int set_user_msr(struct task_struct *task, unsigned long msr)
{
	task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
	task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
	return 0;
}

#ifdef CONFIG_PPC64
static int get_user_dscr(struct task_struct *task, unsigned long *data)
{
	*data = task->thread.dscr;
	return 0;
}

static int set_user_dscr(struct task_struct *task, unsigned long dscr)
{
	task->thread.dscr = dscr;
	task->thread.dscr_inherit = 1;
	return 0;
}
#else
static int get_user_dscr(struct task_struct *task, unsigned long *data)
{
	return -EIO;
}

static int set_user_dscr(struct task_struct *task, unsigned long dscr)
{
	return -EIO;
}
#endif

/*
 * We prevent mucking around with the reserved area of trap
 * which are used internally by the kernel.
 */
static int set_user_trap(struct task_struct *task, unsigned long trap)
{
	set_trap(task->thread.regs, trap);
	return 0;
}

/*
 * Get contents of register REGNO in task TASK.
 */
int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data)
{
	unsigned int regs_max;

	if (task->thread.regs == NULL || !data)
		return -EIO;

	if (regno == PT_MSR) {
		*data = get_user_msr(task);
		return 0;
	}

	if (regno == PT_DSCR)
		return get_user_dscr(task, data);

	/*
	 * softe copies paca->irq_soft_mask variable state. Since irq_soft_mask is
	 * no more used as a flag, lets force usr to alway see the softe value as 1
	 * which means interrupts are not soft disabled.
	 */
	if (IS_ENABLED(CONFIG_PPC64) && regno == PT_SOFTE) {
		*data = 1;
		return  0;
	}

	regs_max = sizeof(struct user_pt_regs) / sizeof(unsigned long);
	if (regno < regs_max) {
		regno = array_index_nospec(regno, regs_max);
		*data = ((unsigned long *)task->thread.regs)[regno];
		return 0;
	}

	return -EIO;
}

/*
 * Write contents of register REGNO in task TASK.
 */
int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
{
	if (task->thread.regs == NULL)
		return -EIO;

	if (regno == PT_MSR)
		return set_user_msr(task, data);
	if (regno == PT_TRAP)
		return set_user_trap(task, data);
	if (regno == PT_DSCR)
		return set_user_dscr(task, data);

	if (regno <= PT_MAX_PUT_REG) {
		regno = array_index_nospec(regno, PT_MAX_PUT_REG + 1);
		((unsigned long *)task->thread.regs)[regno] = data;
		return 0;
	}
	return -EIO;
}

static int gpr_get(struct task_struct *target, const struct user_regset *regset,
		   struct membuf to)
{
	int i;

	if (target->thread.regs == NULL)
		return -EIO;

	if (!FULL_REGS(target->thread.regs)) {
		/* We have a partial register set.  Fill 14-31 with bogus values */
		for (i = 14; i < 32; i++)
			target->thread.regs->gpr[i] = NV_REG_POISON;
	}

	membuf_write(&to, target->thread.regs, offsetof(struct pt_regs, msr));
	membuf_store(&to, get_user_msr(target));

	BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
		     offsetof(struct pt_regs, msr) + sizeof(long));

	membuf_write(&to, &target->thread.regs->orig_gpr3,
			sizeof(struct user_pt_regs) -
			offsetof(struct pt_regs, orig_gpr3));
	return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
				 sizeof(struct user_pt_regs));
}

static int gpr_set(struct task_struct *target, const struct user_regset *regset,
		   unsigned int pos, unsigned int count, const void *kbuf,
		   const void __user *ubuf)
{
	unsigned long reg;
	int ret;

	if (target->thread.regs == NULL)
		return -EIO;

	CHECK_FULL_REGS(target->thread.regs);

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 target->thread.regs,
				 0, PT_MSR * sizeof(reg));

	if (!ret && count > 0) {
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
					 PT_MSR * sizeof(reg),
					 (PT_MSR + 1) * sizeof(reg));
		if (!ret)
			ret = set_user_msr(target, reg);
	}

	BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
		     offsetof(struct pt_regs, msr) + sizeof(long));

	if (!ret)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 &target->thread.regs->orig_gpr3,
					 PT_ORIG_R3 * sizeof(reg),
					 (PT_MAX_PUT_REG + 1) * sizeof(reg));

	if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
						(PT_MAX_PUT_REG + 1) * sizeof(reg),
						PT_TRAP * sizeof(reg));

	if (!ret && count > 0) {
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
					 PT_TRAP * sizeof(reg),
					 (PT_TRAP + 1) * sizeof(reg));
		if (!ret)
			ret = set_user_trap(target, reg);
	}

	if (!ret)
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
						(PT_TRAP + 1) * sizeof(reg), -1);

	return ret;
}

#ifdef CONFIG_PPC64
static int ppr_get(struct task_struct *target, const struct user_regset *regset,
		   struct membuf to)
{
	return membuf_write(&to, &target->thread.regs->ppr, sizeof(u64));
}

static int ppr_set(struct task_struct *target, const struct user_regset *regset,
		   unsigned int pos, unsigned int count, const void *kbuf,
		   const void __user *ubuf)
{
	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				  &target->thread.regs->ppr, 0, sizeof(u64));
}

static int dscr_get(struct task_struct *target, const struct user_regset *regset,
		    struct membuf to)
{
	return membuf_write(&to, &target->thread.dscr, sizeof(u64));
}
static int dscr_set(struct task_struct *target, const struct user_regset *regset,
		    unsigned int pos, unsigned int count, const void *kbuf,
		    const void __user *ubuf)
{
	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				  &target->thread.dscr, 0, sizeof(u64));
}
#endif
#ifdef CONFIG_PPC_BOOK3S_64
static int tar_get(struct task_struct *target, const struct user_regset *regset,
		   struct membuf to)
{
	return membuf_write(&to, &target->thread.tar, sizeof(u64));
}
static int tar_set(struct task_struct *target, const struct user_regset *regset,
		   unsigned int pos, unsigned int count, const void *kbuf,
		   const void __user *ubuf)
{
	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				  &target->thread.tar, 0, sizeof(u64));
}

static int ebb_active(struct task_struct *target, const struct user_regset *regset)
{
	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
		return -ENODEV;

	if (target->thread.used_ebb)
		return regset->n;

	return 0;
}

static int ebb_get(struct task_struct *target, const struct user_regset *regset,
		   struct membuf to)
{
	/* Build tests */
	BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
	BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));

	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
		return -ENODEV;

	if (!target->thread.used_ebb)
		return -ENODATA;

	return membuf_write(&to, &target->thread.ebbrr, 3 * sizeof(unsigned long));
}

static int ebb_set(struct task_struct *target, const struct user_regset *regset,
		   unsigned int pos, unsigned int count, const void *kbuf,
		   const void __user *ubuf)
{
	int ret = 0;

	/* Build tests */
	BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
	BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));

	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
		return -ENODEV;

	if (target->thread.used_ebb)
		return -ENODATA;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ebbrr,
				 0, sizeof(unsigned long));

	if (!ret)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 &target->thread.ebbhr, sizeof(unsigned long),
					 2 * sizeof(unsigned long));

	if (!ret)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 &target->thread.bescr, 2 * sizeof(unsigned long),
					 3 * sizeof(unsigned long));

	return ret;
}
static int pmu_active(struct task_struct *target, const struct user_regset *regset)
{
	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
		return -ENODEV;

	return regset->n;
}

static int pmu_get(struct task_struct *target, const struct user_regset *regset,
		   struct membuf to)
{
	/* Build tests */
	BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
	BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
	BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
	BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));

	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
		return -ENODEV;

	return membuf_write(&to, &target->thread.siar, 5 * sizeof(unsigned long));
}

static int pmu_set(struct task_struct *target, const struct user_regset *regset,
		   unsigned int pos, unsigned int count, const void *kbuf,
		   const void __user *ubuf)
{
	int ret = 0;

	/* Build tests */
	BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
	BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
	BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
	BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));

	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
		return -ENODEV;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.siar,
				 0, sizeof(unsigned long));

	if (!ret)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 &target->thread.sdar, sizeof(unsigned long),
					 2 * sizeof(unsigned long));

	if (!ret)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 &target->thread.sier, 2 * sizeof(unsigned long),
					 3 * sizeof(unsigned long));

	if (!ret)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 &target->thread.mmcr2, 3 * sizeof(unsigned long),
					 4 * sizeof(unsigned long));

	if (!ret)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 &target->thread.mmcr0, 4 * sizeof(unsigned long),
					 5 * sizeof(unsigned long));
	return ret;
}
#endif

#ifdef CONFIG_PPC_MEM_KEYS
static int pkey_active(struct task_struct *target, const struct user_regset *regset)
{
	if (!arch_pkeys_enabled())
		return -ENODEV;

	return regset->n;
}

static int pkey_get(struct task_struct *target, const struct user_regset *regset,
		    struct membuf to)
{
	BUILD_BUG_ON(TSO(amr) + sizeof(unsigned long) != TSO(iamr));
	BUILD_BUG_ON(TSO(iamr) + sizeof(unsigned long) != TSO(uamor));

	if (!arch_pkeys_enabled())
		return -ENODEV;

	return membuf_write(&to, &target->thread.amr, ELF_NPKEY * sizeof(unsigned long));
}

static int pkey_set(struct task_struct *target, const struct user_regset *regset,
		    unsigned int pos, unsigned int count, const void *kbuf,
		    const void __user *ubuf)
{
	u64 new_amr;
	int ret;

	if (!arch_pkeys_enabled())
		return -ENODEV;

	/* Only the AMR can be set from userspace */
	if (pos != 0 || count != sizeof(new_amr))
		return -EINVAL;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 &new_amr, 0, sizeof(new_amr));
	if (ret)
		return ret;

	/* UAMOR determines which bits of the AMR can be set from userspace. */
	target->thread.amr = (new_amr & target->thread.uamor) |
			     (target->thread.amr & ~target->thread.uamor);

	return 0;
}
#endif /* CONFIG_PPC_MEM_KEYS */

static const struct user_regset native_regsets[] = {
	[REGSET_GPR] = {
		.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
		.size = sizeof(long), .align = sizeof(long),
		.regset_get = gpr_get, .set = gpr_set
	},
	[REGSET_FPR] = {
		.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
		.size = sizeof(double), .align = sizeof(double),
		.regset_get = fpr_get, .set = fpr_set
	},
#ifdef CONFIG_ALTIVEC
	[REGSET_VMX] = {
		.core_note_type = NT_PPC_VMX, .n = 34,
		.size = sizeof(vector128), .align = sizeof(vector128),
		.active = vr_active, .regset_get = vr_get, .set = vr_set
	},
#endif
#ifdef CONFIG_VSX
	[REGSET_VSX] = {
		.core_note_type = NT_PPC_VSX, .n = 32,
		.size = sizeof(double), .align = sizeof(double),
		.active = vsr_active, .regset_get = vsr_get, .set = vsr_set
	},
#endif
#ifdef CONFIG_SPE
	[REGSET_SPE] = {
		.core_note_type = NT_PPC_SPE, .n = 35,
		.size = sizeof(u32), .align = sizeof(u32),
		.active = evr_active, .regset_get = evr_get, .set = evr_set
	},
#endif
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	[REGSET_TM_CGPR] = {
		.core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
		.size = sizeof(long), .align = sizeof(long),
		.active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set
	},
	[REGSET_TM_CFPR] = {
		.core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
		.size = sizeof(double), .align = sizeof(double),
		.active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
	},
	[REGSET_TM_CVMX] = {
		.core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
		.size = sizeof(vector128), .align = sizeof(vector128),
		.active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
	},
	[REGSET_TM_CVSX] = {
		.core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
		.size = sizeof(double), .align = sizeof(double),
		.active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
	},
	[REGSET_TM_SPR] = {
		.core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
	},
	[REGSET_TM_CTAR] = {
		.core_note_type = NT_PPC_TM_CTAR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
	},
	[REGSET_TM_CPPR] = {
		.core_note_type = NT_PPC_TM_CPPR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
	},
	[REGSET_TM_CDSCR] = {
		.core_note_type = NT_PPC_TM_CDSCR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
	},
#endif
#ifdef CONFIG_PPC64
	[REGSET_PPR] = {
		.core_note_type = NT_PPC_PPR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.regset_get = ppr_get, .set = ppr_set
	},
	[REGSET_DSCR] = {
		.core_note_type = NT_PPC_DSCR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.regset_get = dscr_get, .set = dscr_set
	},
#endif
#ifdef CONFIG_PPC_BOOK3S_64
	[REGSET_TAR] = {
		.core_note_type = NT_PPC_TAR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.regset_get = tar_get, .set = tar_set
	},
	[REGSET_EBB] = {
		.core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = ebb_active, .regset_get = ebb_get, .set = ebb_set
	},
	[REGSET_PMR] = {
		.core_note_type = NT_PPC_PMU, .n = ELF_NPMU,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = pmu_active, .regset_get = pmu_get, .set = pmu_set
	},
#endif
#ifdef CONFIG_PPC_MEM_KEYS
	[REGSET_PKEY] = {
		.core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = pkey_active, .regset_get = pkey_get, .set = pkey_set
	},
#endif
};

const struct user_regset_view user_ppc_native_view = {
	.name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
	.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
};

#include <linux/compat.h>

int gpr32_get_common(struct task_struct *target,
		     const struct user_regset *regset,
		     struct membuf to, unsigned long *regs)
{
	int i;

	for (i = 0; i < PT_MSR; i++)
		membuf_store(&to, (u32)regs[i]);
	membuf_store(&to, (u32)get_user_msr(target));
	for (i++ ; i < PT_REGS_COUNT; i++)
		membuf_store(&to, (u32)regs[i]);
	return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32));
}

int gpr32_set_common(struct task_struct *target,
		     const struct user_regset *regset,
		     unsigned int pos, unsigned int count,
		     const void *kbuf, const void __user *ubuf,
		     unsigned long *regs)
{
	const compat_ulong_t *k = kbuf;
	const compat_ulong_t __user *u = ubuf;
	compat_ulong_t reg;

	pos /= sizeof(reg);
	count /= sizeof(reg);

	if (kbuf)
		for (; count > 0 && pos < PT_MSR; --count)
			regs[pos++] = *k++;
	else
		for (; count > 0 && pos < PT_MSR; --count) {
			if (__get_user(reg, u++))
				return -EFAULT;
			regs[pos++] = reg;
		}


	if (count > 0 && pos == PT_MSR) {
		if (kbuf)
			reg = *k++;
		else if (__get_user(reg, u++))
			return -EFAULT;
		set_user_msr(target, reg);
		++pos;
		--count;
	}

	if (kbuf) {
		for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
			regs[pos++] = *k++;
		for (; count > 0 && pos < PT_TRAP; --count, ++pos)
			++k;
	} else {
		for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
			if (__get_user(reg, u++))
				return -EFAULT;
			regs[pos++] = reg;
		}
		for (; count > 0 && pos < PT_TRAP; --count, ++pos)
			if (__get_user(reg, u++))
				return -EFAULT;
	}

	if (count > 0 && pos == PT_TRAP) {
		if (kbuf)
			reg = *k++;
		else if (__get_user(reg, u++))
			return -EFAULT;
		set_user_trap(target, reg);
		++pos;
		--count;
	}

	kbuf = k;
	ubuf = u;
	pos *= sizeof(reg);
	count *= sizeof(reg);
	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
					 (PT_TRAP + 1) * sizeof(reg), -1);
}

static int gpr32_get(struct task_struct *target,
		     const struct user_regset *regset,
		     struct membuf to)
{
	int i;

	if (target->thread.regs == NULL)
		return -EIO;

	if (!FULL_REGS(target->thread.regs)) {
		/*
		 * We have a partial register set.
		 * Fill 14-31 with bogus values.
		 */
		for (i = 14; i < 32; i++)
			target->thread.regs->gpr[i] = NV_REG_POISON;
	}
	return gpr32_get_common(target, regset, to,
			&target->thread.regs->gpr[0]);
}

static int gpr32_set(struct task_struct *target,
		     const struct user_regset *regset,
		     unsigned int pos, unsigned int count,
		     const void *kbuf, const void __user *ubuf)
{
	if (target->thread.regs == NULL)
		return -EIO;

	CHECK_FULL_REGS(target->thread.regs);
	return gpr32_set_common(target, regset, pos, count, kbuf, ubuf,
			&target->thread.regs->gpr[0]);
}

/*
 * These are the regset flavors matching the CONFIG_PPC32 native set.
 */
static const struct user_regset compat_regsets[] = {
	[REGSET_GPR] = {
		.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
		.size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
		.regset_get = gpr32_get, .set = gpr32_set
	},
	[REGSET_FPR] = {
		.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
		.size = sizeof(double), .align = sizeof(double),
		.regset_get = fpr_get, .set = fpr_set
	},
#ifdef CONFIG_ALTIVEC
	[REGSET_VMX] = {
		.core_note_type = NT_PPC_VMX, .n = 34,
		.size = sizeof(vector128), .align = sizeof(vector128),
		.active = vr_active, .regset_get = vr_get, .set = vr_set
	},
#endif
#ifdef CONFIG_SPE
	[REGSET_SPE] = {
		.core_note_type = NT_PPC_SPE, .n = 35,
		.size = sizeof(u32), .align = sizeof(u32),
		.active = evr_active, .regset_get = evr_get, .set = evr_set
	},
#endif
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	[REGSET_TM_CGPR] = {
		.core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
		.size = sizeof(long), .align = sizeof(long),
		.active = tm_cgpr_active,
		.regset_get = tm_cgpr32_get, .set = tm_cgpr32_set
	},
	[REGSET_TM_CFPR] = {
		.core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
		.size = sizeof(double), .align = sizeof(double),
		.active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
	},
	[REGSET_TM_CVMX] = {
		.core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
		.size = sizeof(vector128), .align = sizeof(vector128),
		.active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
	},
	[REGSET_TM_CVSX] = {
		.core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
		.size = sizeof(double), .align = sizeof(double),
		.active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
	},
	[REGSET_TM_SPR] = {
		.core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
	},
	[REGSET_TM_CTAR] = {
		.core_note_type = NT_PPC_TM_CTAR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
	},
	[REGSET_TM_CPPR] = {
		.core_note_type = NT_PPC_TM_CPPR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
	},
	[REGSET_TM_CDSCR] = {
		.core_note_type = NT_PPC_TM_CDSCR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
	},
#endif
#ifdef CONFIG_PPC64
	[REGSET_PPR] = {
		.core_note_type = NT_PPC_PPR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.regset_get = ppr_get, .set = ppr_set
	},
	[REGSET_DSCR] = {
		.core_note_type = NT_PPC_DSCR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.regset_get = dscr_get, .set = dscr_set
	},
#endif
#ifdef CONFIG_PPC_BOOK3S_64
	[REGSET_TAR] = {
		.core_note_type = NT_PPC_TAR, .n = 1,
		.size = sizeof(u64), .align = sizeof(u64),
		.regset_get = tar_get, .set = tar_set
	},
	[REGSET_EBB] = {
		.core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
		.size = sizeof(u64), .align = sizeof(u64),
		.active = ebb_active, .regset_get = ebb_get, .set = ebb_set
	},
#endif
};

static const struct user_regset_view user_ppc_compat_view = {
	.name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
	.regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
};

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
	if (IS_ENABLED(CONFIG_PPC64) && test_tsk_thread_flag(task, TIF_32BIT))
		return &user_ppc_compat_view;
	return &user_ppc_native_view;
}