aboutsummaryrefslogtreecommitdiff
path: root/common/ctf/ctf_open.c
blob: e49a4cb3293430480aa60b9b9d694f9c07e200c6 (plain) (blame)
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
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <ctf_impl.h>
#include <sys/mman.h>
#include <sys/zmod.h>

static const ctf_dmodel_t _libctf_models[] = {
	{ "ILP32", CTF_MODEL_ILP32, 4, 1, 2, 4, 4 },
	{ "LP64", CTF_MODEL_LP64, 8, 1, 2, 4, 8 },
	{ NULL, 0, 0, 0, 0, 0, 0 }
};

const char _CTF_SECTION[] = ".SUNW_ctf";
const char _CTF_NULLSTR[] = "";

int _libctf_version = CTF_VERSION;	/* library client version */
int _libctf_debug = 0;			/* debugging messages enabled */

static ushort_t
get_kind_v1(ushort_t info)
{
	return (CTF_INFO_KIND_V1(info));
}

static ushort_t
get_kind_v2(ushort_t info)
{
	return (CTF_INFO_KIND(info));
}

static ushort_t
get_root_v1(ushort_t info)
{
	return (CTF_INFO_ISROOT_V1(info));
}

static ushort_t
get_root_v2(ushort_t info)
{
	return (CTF_INFO_ISROOT(info));
}

static ushort_t
get_vlen_v1(ushort_t info)
{
	return (CTF_INFO_VLEN_V1(info));
}

static ushort_t
get_vlen_v2(ushort_t info)
{
	return (CTF_INFO_VLEN(info));
}

static const ctf_fileops_t ctf_fileops[] = {
	{ NULL, NULL },
	{ get_kind_v1, get_root_v1, get_vlen_v1 },
	{ get_kind_v2, get_root_v2, get_vlen_v2 },
};

/*
 * Convert a 32-bit ELF symbol into GElf (Elf64) and return a pointer to it.
 */
static Elf64_Sym *
sym_to_gelf(const Elf32_Sym *src, Elf64_Sym *dst)
{
	dst->st_name = src->st_name;
	dst->st_value = src->st_value;
	dst->st_size = src->st_size;
	dst->st_info = src->st_info;
	dst->st_other = src->st_other;
	dst->st_shndx = src->st_shndx;

	return (dst);
}

/*
 * Initialize the symtab translation table by filling each entry with the
 * offset of the CTF type or function data corresponding to each STT_FUNC or
 * STT_OBJECT entry in the symbol table.
 */
static int
init_symtab(ctf_file_t *fp, const ctf_header_t *hp,
    const ctf_sect_t *sp, const ctf_sect_t *strp)
{
	const uchar_t *symp = sp->cts_data;
	uint_t *xp = fp->ctf_sxlate;
	uint_t *xend = xp + fp->ctf_nsyms;

	uint_t objtoff = hp->cth_objtoff;
	uint_t funcoff = hp->cth_funcoff;

	ushort_t info, vlen;
	Elf64_Sym sym, *gsp;
	const char *name;

	/*
	 * The CTF data object and function type sections are ordered to match
	 * the relative order of the respective symbol types in the symtab.
	 * If no type information is available for a symbol table entry, a
	 * pad is inserted in the CTF section.  As a further optimization,
	 * anonymous or undefined symbols are omitted from the CTF data.
	 */
	for (; xp < xend; xp++, symp += sp->cts_entsize) {
		if (sp->cts_entsize == sizeof (Elf32_Sym))
			gsp = sym_to_gelf((Elf32_Sym *)(uintptr_t)symp, &sym);
		else
			gsp = (Elf64_Sym *)(uintptr_t)symp;

		if (gsp->st_name < strp->cts_size)
			name = (const char *)strp->cts_data + gsp->st_name;
		else
			name = _CTF_NULLSTR;

		if (gsp->st_name == 0 || gsp->st_shndx == SHN_UNDEF ||
		    strcmp(name, "_START_") == 0 ||
		    strcmp(name, "_END_") == 0) {
			*xp = -1u;
			continue;
		}

		switch (ELF64_ST_TYPE(gsp->st_info)) {
		case STT_OBJECT:
			if (objtoff >= hp->cth_funcoff ||
			    (gsp->st_shndx == SHN_ABS && gsp->st_value == 0)) {
				*xp = -1u;
				break;
			}

			*xp = objtoff;
			objtoff += sizeof (ushort_t);
			break;

		case STT_FUNC:
			if (funcoff >= hp->cth_typeoff) {
				*xp = -1u;
				break;
			}

			*xp = funcoff;

			info = *(ushort_t *)((uintptr_t)fp->ctf_buf + funcoff);
			vlen = LCTF_INFO_VLEN(fp, info);

			/*
			 * If we encounter a zero pad at the end, just skip it.
			 * Otherwise skip over the function and its return type
			 * (+2) and the argument list (vlen).
			 */
			if (LCTF_INFO_KIND(fp, info) == CTF_K_UNKNOWN &&
			    vlen == 0)
				funcoff += sizeof (ushort_t); /* skip pad */
			else
				funcoff += sizeof (ushort_t) * (vlen + 2);
			break;

		default:
			*xp = -1u;
			break;
		}
	}

	ctf_dprintf("loaded %lu symtab entries\n", fp->ctf_nsyms);
	return (0);
}

/*
 * Initialize the type ID translation table with the byte offset of each type,
 * and initialize the hash tables of each named type.
 */
static int
init_types(ctf_file_t *fp, const ctf_header_t *cth)
{
	/* LINTED - pointer alignment */
	const ctf_type_t *tbuf = (ctf_type_t *)(fp->ctf_buf + cth->cth_typeoff);
	/* LINTED - pointer alignment */
	const ctf_type_t *tend = (ctf_type_t *)(fp->ctf_buf + cth->cth_stroff);

	ulong_t pop[CTF_K_MAX + 1] = { 0 };
	const ctf_type_t *tp;
	ctf_hash_t *hp;
	ushort_t id, dst;
	uint_t *xp;

	/*
	 * We initially determine whether the container is a child or a parent
	 * based on the value of cth_parname.  To support containers that pre-
	 * date cth_parname, we also scan the types themselves for references
	 * to values in the range reserved for child types in our first pass.
	 */
	int child = cth->cth_parname != 0;
	int nlstructs = 0, nlunions = 0;
	int err;

	/*
	 * We make two passes through the entire type section.  In this first
	 * pass, we count the number of each type and the total number of types.
	 */
	for (tp = tbuf; tp < tend; fp->ctf_typemax++) {
		ushort_t kind = LCTF_INFO_KIND(fp, tp->ctt_info);
		ulong_t vlen = LCTF_INFO_VLEN(fp, tp->ctt_info);
		ssize_t size, increment;

		size_t vbytes;
		uint_t n;

		(void) ctf_get_ctt_size(fp, tp, &size, &increment);

		switch (kind) {
		case CTF_K_INTEGER:
		case CTF_K_FLOAT:
			vbytes = sizeof (uint_t);
			break;
		case CTF_K_ARRAY:
			vbytes = sizeof (ctf_array_t);
			break;
		case CTF_K_FUNCTION:
			vbytes = sizeof (ushort_t) * (vlen + (vlen & 1));
			break;
		case CTF_K_STRUCT:
		case CTF_K_UNION:
			if (fp->ctf_version == CTF_VERSION_1 ||
			    size < CTF_LSTRUCT_THRESH) {
				ctf_member_t *mp = (ctf_member_t *)
				    ((uintptr_t)tp + increment);

				vbytes = sizeof (ctf_member_t) * vlen;
				for (n = vlen; n != 0; n--, mp++)
					child |= CTF_TYPE_ISCHILD(mp->ctm_type);
			} else {
				ctf_lmember_t *lmp = (ctf_lmember_t *)
				    ((uintptr_t)tp + increment);

				vbytes = sizeof (ctf_lmember_t) * vlen;
				for (n = vlen; n != 0; n--, lmp++)
					child |=
					    CTF_TYPE_ISCHILD(lmp->ctlm_type);
			}
			break;
		case CTF_K_ENUM:
			vbytes = sizeof (ctf_enum_t) * vlen;
			break;
		case CTF_K_FORWARD:
			/*
			 * For forward declarations, ctt_type is the CTF_K_*
			 * kind for the tag, so bump that population count too.
			 * If ctt_type is unknown, treat the tag as a struct.
			 */
			if (tp->ctt_type == CTF_K_UNKNOWN ||
			    tp->ctt_type >= CTF_K_MAX)
				pop[CTF_K_STRUCT]++;
			else
				pop[tp->ctt_type]++;
			/*FALLTHRU*/
		case CTF_K_UNKNOWN:
			vbytes = 0;
			break;
		case CTF_K_POINTER:
		case CTF_K_TYPEDEF:
		case CTF_K_VOLATILE:
		case CTF_K_CONST:
		case CTF_K_RESTRICT:
			child |= CTF_TYPE_ISCHILD(tp->ctt_type);
			vbytes = 0;
			break;
		default:
			ctf_dprintf("detected invalid CTF kind -- %u\n", kind);
			return (ECTF_CORRUPT);
		}
		tp = (ctf_type_t *)((uintptr_t)tp + increment + vbytes);
		pop[kind]++;
	}

	/*
	 * If we detected a reference to a child type ID, then we know this
	 * container is a child and may have a parent's types imported later.
	 */
	if (child) {
		ctf_dprintf("CTF container %p is a child\n", (void *)fp);
		fp->ctf_flags |= LCTF_CHILD;
	} else
		ctf_dprintf("CTF container %p is a parent\n", (void *)fp);

	/*
	 * Now that we've counted up the number of each type, we can allocate
	 * the hash tables, type translation table, and pointer table.
	 */
	if ((err = ctf_hash_create(&fp->ctf_structs, pop[CTF_K_STRUCT])) != 0)
		return (err);

	if ((err = ctf_hash_create(&fp->ctf_unions, pop[CTF_K_UNION])) != 0)
		return (err);

	if ((err = ctf_hash_create(&fp->ctf_enums, pop[CTF_K_ENUM])) != 0)
		return (err);

	if ((err = ctf_hash_create(&fp->ctf_names,
	    pop[CTF_K_INTEGER] + pop[CTF_K_FLOAT] + pop[CTF_K_FUNCTION] +
	    pop[CTF_K_TYPEDEF] + pop[CTF_K_POINTER] + pop[CTF_K_VOLATILE] +
	    pop[CTF_K_CONST] + pop[CTF_K_RESTRICT])) != 0)
		return (err);

	fp->ctf_txlate = ctf_alloc(sizeof (uint_t) * (fp->ctf_typemax + 1));
	fp->ctf_ptrtab = ctf_alloc(sizeof (ushort_t) * (fp->ctf_typemax + 1));

	if (fp->ctf_txlate == NULL || fp->ctf_ptrtab == NULL)
		return (EAGAIN); /* memory allocation failed */

	xp = fp->ctf_txlate;
	*xp++ = 0; /* type id 0 is used as a sentinel value */

	bzero(fp->ctf_txlate, sizeof (uint_t) * (fp->ctf_typemax + 1));
	bzero(fp->ctf_ptrtab, sizeof (ushort_t) * (fp->ctf_typemax + 1));

	/*
	 * In the second pass through the types, we fill in each entry of the
	 * type and pointer tables and add names to the appropriate hashes.
	 */
	for (id = 1, tp = tbuf; tp < tend; xp++, id++) {
		ushort_t kind = LCTF_INFO_KIND(fp, tp->ctt_info);
		ulong_t vlen = LCTF_INFO_VLEN(fp, tp->ctt_info);
		ssize_t size, increment;

		const char *name;
		size_t vbytes;
		ctf_helem_t *hep;
		ctf_encoding_t cte;

		(void) ctf_get_ctt_size(fp, tp, &size, &increment);
		name = ctf_strptr(fp, tp->ctt_name);

		switch (kind) {
		case CTF_K_INTEGER:
		case CTF_K_FLOAT:
			/*
			 * Only insert a new integer base type definition if
			 * this type name has not been defined yet.  We re-use
			 * the names with different encodings for bit-fields.
			 */
			if ((hep = ctf_hash_lookup(&fp->ctf_names, fp,
			    name, strlen(name))) == NULL) {
				err = ctf_hash_insert(&fp->ctf_names, fp,
				    CTF_INDEX_TO_TYPE(id, child), tp->ctt_name);
				if (err != 0 && err != ECTF_STRTAB)
					return (err);
			} else if (ctf_type_encoding(fp, hep->h_type,
			    &cte) == 0 && cte.cte_bits == 0) {
				/*
				 * Work-around SOS8 stabs bug: replace existing
				 * intrinsic w/ same name if it was zero bits.
				 */
				hep->h_type = CTF_INDEX_TO_TYPE(id, child);
			}
			vbytes = sizeof (uint_t);
			break;

		case CTF_K_ARRAY:
			vbytes = sizeof (ctf_array_t);
			break;

		case CTF_K_FUNCTION:
			err = ctf_hash_insert(&fp->ctf_names, fp,
			    CTF_INDEX_TO_TYPE(id, child), tp->ctt_name);
			if (err != 0 && err != ECTF_STRTAB)
				return (err);
			vbytes = sizeof (ushort_t) * (vlen + (vlen & 1));
			break;

		case CTF_K_STRUCT:
			err = ctf_hash_define(&fp->ctf_structs, fp,
			    CTF_INDEX_TO_TYPE(id, child), tp->ctt_name);

			if (err != 0 && err != ECTF_STRTAB)
				return (err);

			if (fp->ctf_version == CTF_VERSION_1 ||
			    size < CTF_LSTRUCT_THRESH)
				vbytes = sizeof (ctf_member_t) * vlen;
			else {
				vbytes = sizeof (ctf_lmember_t) * vlen;
				nlstructs++;
			}
			break;

		case CTF_K_UNION:
			err = ctf_hash_define(&fp->ctf_unions, fp,
			    CTF_INDEX_TO_TYPE(id, child), tp->ctt_name);

			if (err != 0 && err != ECTF_STRTAB)
				return (err);

			if (fp->ctf_version == CTF_VERSION_1 ||
			    size < CTF_LSTRUCT_THRESH)
				vbytes = sizeof (ctf_member_t) * vlen;
			else {
				vbytes = sizeof (ctf_lmember_t) * vlen;
				nlunions++;
			}
			break;

		case CTF_K_ENUM:
			err = ctf_hash_define(&fp->ctf_enums, fp,
			    CTF_INDEX_TO_TYPE(id, child), tp->ctt_name);

			if (err != 0 && err != ECTF_STRTAB)
				return (err);

			vbytes = sizeof (ctf_enum_t) * vlen;
			break;

		case CTF_K_TYPEDEF:
			err = ctf_hash_insert(&fp->ctf_names, fp,
			    CTF_INDEX_TO_TYPE(id, child), tp->ctt_name);
			if (err != 0 && err != ECTF_STRTAB)
				return (err);
			vbytes = 0;
			break;

		case CTF_K_FORWARD:
			/*
			 * Only insert forward tags into the given hash if the
			 * type or tag name is not already present.
			 */
			switch (tp->ctt_type) {
			case CTF_K_STRUCT:
				hp = &fp->ctf_structs;
				break;
			case CTF_K_UNION:
				hp = &fp->ctf_unions;
				break;
			case CTF_K_ENUM:
				hp = &fp->ctf_enums;
				break;
			default:
				hp = &fp->ctf_structs;
			}

			if (ctf_hash_lookup(hp, fp,
			    name, strlen(name)) == NULL) {
				err = ctf_hash_insert(hp, fp,
				    CTF_INDEX_TO_TYPE(id, child), tp->ctt_name);
				if (err != 0 && err != ECTF_STRTAB)
					return (err);
			}
			vbytes = 0;
			break;

		case CTF_K_POINTER:
			/*
			 * If the type referenced by the pointer is in this CTF
			 * container, then store the index of the pointer type
			 * in fp->ctf_ptrtab[ index of referenced type ].
			 */
			if (CTF_TYPE_ISCHILD(tp->ctt_type) == child &&
			    CTF_TYPE_TO_INDEX(tp->ctt_type) <= fp->ctf_typemax)
				fp->ctf_ptrtab[
				    CTF_TYPE_TO_INDEX(tp->ctt_type)] = id;
			/*FALLTHRU*/

		case CTF_K_VOLATILE:
		case CTF_K_CONST:
		case CTF_K_RESTRICT:
			err = ctf_hash_insert(&fp->ctf_names, fp,
			    CTF_INDEX_TO_TYPE(id, child), tp->ctt_name);
			if (err != 0 && err != ECTF_STRTAB)
				return (err);
			/*FALLTHRU*/

		default:
			vbytes = 0;
			break;
		}

		*xp = (uint_t)((uintptr_t)tp - (uintptr_t)fp->ctf_buf);
		tp = (ctf_type_t *)((uintptr_t)tp + increment + vbytes);
	}

	ctf_dprintf("%lu total types processed\n", fp->ctf_typemax);
	ctf_dprintf("%u enum names hashed\n", ctf_hash_size(&fp->ctf_enums));
	ctf_dprintf("%u struct names hashed (%d long)\n",
	    ctf_hash_size(&fp->ctf_structs), nlstructs);
	ctf_dprintf("%u union names hashed (%d long)\n",
	    ctf_hash_size(&fp->ctf_unions), nlunions);
	ctf_dprintf("%u base type names hashed\n",
	    ctf_hash_size(&fp->ctf_names));

	/*
	 * Make an additional pass through the pointer table to find pointers
	 * that point to anonymous typedef nodes.  If we find one, modify the
	 * pointer table so that the pointer is also known to point to the
	 * node that is referenced by the anonymous typedef node.
	 */
	for (id = 1; id <= fp->ctf_typemax; id++) {
		if ((dst = fp->ctf_ptrtab[id]) != 0) {
			tp = LCTF_INDEX_TO_TYPEPTR(fp, id);

			if (LCTF_INFO_KIND(fp, tp->ctt_info) == CTF_K_TYPEDEF &&
			    strcmp(ctf_strptr(fp, tp->ctt_name), "") == 0 &&
			    CTF_TYPE_ISCHILD(tp->ctt_type) == child &&
			    CTF_TYPE_TO_INDEX(tp->ctt_type) <= fp->ctf_typemax)
				fp->ctf_ptrtab[
				    CTF_TYPE_TO_INDEX(tp->ctt_type)] = dst;
		}
	}

	return (0);
}

/*
 * Decode the specified CTF buffer and optional symbol table and create a new
 * CTF container representing the symbolic debugging information.  This code
 * can be used directly by the debugger, or it can be used as the engine for
 * ctf_fdopen() or ctf_open(), below.
 */
ctf_file_t *
ctf_bufopen(const ctf_sect_t *ctfsect, const ctf_sect_t *symsect,
    const ctf_sect_t *strsect, int *errp)
{
	const ctf_preamble_t *pp;
	ctf_header_t hp;
	ctf_file_t *fp;
	void *buf, *base;
	size_t size, hdrsz;
	int err;

	if (ctfsect == NULL || ((symsect == NULL) != (strsect == NULL)))
		return (ctf_set_open_errno(errp, EINVAL));

	if (symsect != NULL && symsect->cts_entsize != sizeof (Elf32_Sym) &&
	    symsect->cts_entsize != sizeof (Elf64_Sym))
		return (ctf_set_open_errno(errp, ECTF_SYMTAB));

	if (symsect != NULL && symsect->cts_data == NULL)
		return (ctf_set_open_errno(errp, ECTF_SYMBAD));

	if (strsect != NULL && strsect->cts_data == NULL)
		return (ctf_set_open_errno(errp, ECTF_STRBAD));

	if (ctfsect->cts_size < sizeof (ctf_preamble_t))
		return (ctf_set_open_errno(errp, ECTF_NOCTFBUF));

	pp = (const ctf_preamble_t *)ctfsect->cts_data;

	ctf_dprintf("ctf_bufopen: magic=0x%x version=%u\n",
	    pp->ctp_magic, pp->ctp_version);

	/*
	 * Validate each part of the CTF header (either V1 or V2).
	 * First, we validate the preamble (common to all versions).  At that
	 * point, we know specific header version, and can validate the
	 * version-specific parts including section offsets and alignments.
	 */
	if (pp->ctp_magic != CTF_MAGIC)
		return (ctf_set_open_errno(errp, ECTF_NOCTFBUF));

	if (pp->ctp_version == CTF_VERSION_2) {
		if (ctfsect->cts_size < sizeof (ctf_header_t))
			return (ctf_set_open_errno(errp, ECTF_NOCTFBUF));

		bcopy(ctfsect->cts_data, &hp, sizeof (hp));
		hdrsz = sizeof (ctf_header_t);

	} else if (pp->ctp_version == CTF_VERSION_1) {
		const ctf_header_v1_t *h1p =
		    (const ctf_header_v1_t *)ctfsect->cts_data;

		if (ctfsect->cts_size < sizeof (ctf_header_v1_t))
			return (ctf_set_open_errno(errp, ECTF_NOCTFBUF));

		bzero(&hp, sizeof (hp));
		hp.cth_preamble = h1p->cth_preamble;
		hp.cth_objtoff = h1p->cth_objtoff;
		hp.cth_funcoff = h1p->cth_funcoff;
		hp.cth_typeoff = h1p->cth_typeoff;
		hp.cth_stroff = h1p->cth_stroff;
		hp.cth_strlen = h1p->cth_strlen;

		hdrsz = sizeof (ctf_header_v1_t);
	} else
		return (ctf_set_open_errno(errp, ECTF_CTFVERS));

	size = hp.cth_stroff + hp.cth_strlen;

	ctf_dprintf("ctf_bufopen: uncompressed size=%lu\n", (ulong_t)size);

	if (hp.cth_lbloff > size || hp.cth_objtoff > size ||
	    hp.cth_funcoff > size || hp.cth_typeoff > size ||
	    hp.cth_stroff > size)
		return (ctf_set_open_errno(errp, ECTF_CORRUPT));

	if (hp.cth_lbloff > hp.cth_objtoff ||
	    hp.cth_objtoff > hp.cth_funcoff ||
	    hp.cth_funcoff > hp.cth_typeoff ||
	    hp.cth_typeoff > hp.cth_stroff)
		return (ctf_set_open_errno(errp, ECTF_CORRUPT));

	if ((hp.cth_lbloff & 3) || (hp.cth_objtoff & 1) ||
	    (hp.cth_funcoff & 1) || (hp.cth_typeoff & 3))
		return (ctf_set_open_errno(errp, ECTF_CORRUPT));

	/*
	 * Once everything is determined to be valid, attempt to decompress
	 * the CTF data buffer if it is compressed.  Otherwise we just put
	 * the data section's buffer pointer into ctf_buf, below.
	 */
	if (hp.cth_flags & CTF_F_COMPRESS) {
		size_t srclen, dstlen;
		const void *src;
		int rc = Z_OK;

		if (ctf_zopen(errp) == NULL)
			return (NULL); /* errp is set for us */

		if ((base = ctf_data_alloc(size + hdrsz)) == MAP_FAILED)
			return (ctf_set_open_errno(errp, ECTF_ZALLOC));

		bcopy(ctfsect->cts_data, base, hdrsz);
		((ctf_preamble_t *)base)->ctp_flags &= ~CTF_F_COMPRESS;
		buf = (uchar_t *)base + hdrsz;

		src = (uchar_t *)ctfsect->cts_data + hdrsz;
		srclen = ctfsect->cts_size - hdrsz;
		dstlen = size;

		if ((rc = z_uncompress(buf, &dstlen, src, srclen)) != Z_OK) {
			ctf_dprintf("zlib inflate err: %s\n", z_strerror(rc));
			ctf_data_free(base, size + hdrsz);
			return (ctf_set_open_errno(errp, ECTF_DECOMPRESS));
		}

		if (dstlen != size) {
			ctf_dprintf("zlib inflate short -- got %lu of %lu "
			    "bytes\n", (ulong_t)dstlen, (ulong_t)size);
			ctf_data_free(base, size + hdrsz);
			return (ctf_set_open_errno(errp, ECTF_CORRUPT));
		}

		ctf_data_protect(base, size + hdrsz);

	} else {
		base = (void *)ctfsect->cts_data;
		buf = (uchar_t *)base + hdrsz;
	}

	/*
	 * Once we have uncompressed and validated the CTF data buffer, we can
	 * proceed with allocating a ctf_file_t and initializing it.
	 */
	if ((fp = ctf_alloc(sizeof (ctf_file_t))) == NULL)
		return (ctf_set_open_errno(errp, EAGAIN));

	bzero(fp, sizeof (ctf_file_t));
	fp->ctf_version = hp.cth_version;
	fp->ctf_fileops = &ctf_fileops[hp.cth_version];
	bcopy(ctfsect, &fp->ctf_data, sizeof (ctf_sect_t));

	if (symsect != NULL) {
		bcopy(symsect, &fp->ctf_symtab, sizeof (ctf_sect_t));
		bcopy(strsect, &fp->ctf_strtab, sizeof (ctf_sect_t));
	}

	if (fp->ctf_data.cts_name != NULL)
		fp->ctf_data.cts_name = ctf_strdup(fp->ctf_data.cts_name);
	if (fp->ctf_symtab.cts_name != NULL)
		fp->ctf_symtab.cts_name = ctf_strdup(fp->ctf_symtab.cts_name);
	if (fp->ctf_strtab.cts_name != NULL)
		fp->ctf_strtab.cts_name = ctf_strdup(fp->ctf_strtab.cts_name);

	if (fp->ctf_data.cts_name == NULL)
		fp->ctf_data.cts_name = _CTF_NULLSTR;
	if (fp->ctf_symtab.cts_name == NULL)
		fp->ctf_symtab.cts_name = _CTF_NULLSTR;
	if (fp->ctf_strtab.cts_name == NULL)
		fp->ctf_strtab.cts_name = _CTF_NULLSTR;

	fp->ctf_str[CTF_STRTAB_0].cts_strs = (const char *)buf + hp.cth_stroff;
	fp->ctf_str[CTF_STRTAB_0].cts_len = hp.cth_strlen;

	if (strsect != NULL) {
		fp->ctf_str[CTF_STRTAB_1].cts_strs = strsect->cts_data;
		fp->ctf_str[CTF_STRTAB_1].cts_len = strsect->cts_size;
	}

	fp->ctf_base = base;
	fp->ctf_buf = buf;
	fp->ctf_size = size + hdrsz;

	/*
	 * If we have a parent container name and label, store the relocated
	 * string pointers in the CTF container for easy access later.
	 */
	if (hp.cth_parlabel != 0)
		fp->ctf_parlabel = ctf_strptr(fp, hp.cth_parlabel);
	if (hp.cth_parname != 0)
		fp->ctf_parname = ctf_strptr(fp, hp.cth_parname);

	ctf_dprintf("ctf_bufopen: parent name %s (label %s)\n",
	    fp->ctf_parname ? fp->ctf_parname : "<NULL>",
	    fp->ctf_parlabel ? fp->ctf_parlabel : "<NULL>");

	/*
	 * If we have a symbol table section, allocate and initialize
	 * the symtab translation table, pointed to by ctf_sxlate.
	 */
	if (symsect != NULL) {
		fp->ctf_nsyms = symsect->cts_size / symsect->cts_entsize;
		fp->ctf_sxlate = ctf_alloc(fp->ctf_nsyms * sizeof (uint_t));

		if (fp->ctf_sxlate == NULL) {
			(void) ctf_set_open_errno(errp, EAGAIN);
			goto bad;
		}

		if ((err = init_symtab(fp, &hp, symsect, strsect)) != 0) {
			(void) ctf_set_open_errno(errp, err);
			goto bad;
		}
	}

	if ((err = init_types(fp, &hp)) != 0) {
		(void) ctf_set_open_errno(errp, err);
		goto bad;
	}

	/*
	 * Initialize the ctf_lookup_by_name top-level dictionary.  We keep an
	 * array of type name prefixes and the corresponding ctf_hash to use.
	 * NOTE: This code must be kept in sync with the code in ctf_update().
	 */
	fp->ctf_lookups[0].ctl_prefix = "struct";
	fp->ctf_lookups[0].ctl_len = strlen(fp->ctf_lookups[0].ctl_prefix);
	fp->ctf_lookups[0].ctl_hash = &fp->ctf_structs;
	fp->ctf_lookups[1].ctl_prefix = "union";
	fp->ctf_lookups[1].ctl_len = strlen(fp->ctf_lookups[1].ctl_prefix);
	fp->ctf_lookups[1].ctl_hash = &fp->ctf_unions;
	fp->ctf_lookups[2].ctl_prefix = "enum";
	fp->ctf_lookups[2].ctl_len = strlen(fp->ctf_lookups[2].ctl_prefix);
	fp->ctf_lookups[2].ctl_hash = &fp->ctf_enums;
	fp->ctf_lookups[3].ctl_prefix = _CTF_NULLSTR;
	fp->ctf_lookups[3].ctl_len = strlen(fp->ctf_lookups[3].ctl_prefix);
	fp->ctf_lookups[3].ctl_hash = &fp->ctf_names;
	fp->ctf_lookups[4].ctl_prefix = NULL;
	fp->ctf_lookups[4].ctl_len = 0;
	fp->ctf_lookups[4].ctl_hash = NULL;

	if (symsect != NULL) {
		if (symsect->cts_entsize == sizeof (Elf64_Sym))
			(void) ctf_setmodel(fp, CTF_MODEL_LP64);
		else
			(void) ctf_setmodel(fp, CTF_MODEL_ILP32);
	} else
		(void) ctf_setmodel(fp, CTF_MODEL_NATIVE);

	fp->ctf_refcnt = 1;
	return (fp);

bad:
	ctf_close(fp);
	return (NULL);
}

/*
 * Close the specified CTF container and free associated data structures.  Note
 * that ctf_close() is a reference counted operation: if the specified file is
 * the parent of other active containers, its reference count will be greater
 * than one and it will be freed later when no active children exist.
 */
void
ctf_close(ctf_file_t *fp)
{
	ctf_dtdef_t *dtd, *ntd;

	if (fp == NULL)
		return; /* allow ctf_close(NULL) to simplify caller code */

	ctf_dprintf("ctf_close(%p) refcnt=%u\n", (void *)fp, fp->ctf_refcnt);

	if (fp->ctf_refcnt > 1) {
		fp->ctf_refcnt--;
		return;
	}

	if (fp->ctf_parent != NULL)
		ctf_close(fp->ctf_parent);

	for (dtd = ctf_list_next(&fp->ctf_dtdefs); dtd != NULL; dtd = ntd) {
		ntd = ctf_list_next(dtd);
		ctf_dtd_delete(fp, dtd);
	}

	ctf_free(fp->ctf_dthash, fp->ctf_dthashlen * sizeof (ctf_dtdef_t *));

	if (fp->ctf_flags & LCTF_MMAP) {
		if (fp->ctf_data.cts_data != NULL)
			ctf_sect_munmap(&fp->ctf_data);
		if (fp->ctf_symtab.cts_data != NULL)
			ctf_sect_munmap(&fp->ctf_symtab);
		if (fp->ctf_strtab.cts_data != NULL)
			ctf_sect_munmap(&fp->ctf_strtab);
	}

	if (fp->ctf_data.cts_name != _CTF_NULLSTR &&
	    fp->ctf_data.cts_name != NULL) {
		ctf_free((char *)fp->ctf_data.cts_name,
		    strlen(fp->ctf_data.cts_name) + 1);
	}

	if (fp->ctf_symtab.cts_name != _CTF_NULLSTR &&
	    fp->ctf_symtab.cts_name != NULL) {
		ctf_free((char *)fp->ctf_symtab.cts_name,
		    strlen(fp->ctf_symtab.cts_name) + 1);
	}

	if (fp->ctf_strtab.cts_name != _CTF_NULLSTR &&
	    fp->ctf_strtab.cts_name != NULL) {
		ctf_free((char *)fp->ctf_strtab.cts_name,
		    strlen(fp->ctf_strtab.cts_name) + 1);
	}

	if (fp->ctf_base != fp->ctf_data.cts_data && fp->ctf_base != NULL)
		ctf_data_free((void *)fp->ctf_base, fp->ctf_size);

	if (fp->ctf_sxlate != NULL)
		ctf_free(fp->ctf_sxlate, sizeof (uint_t) * fp->ctf_nsyms);

	if (fp->ctf_txlate != NULL) {
		ctf_free(fp->ctf_txlate,
		    sizeof (uint_t) * (fp->ctf_typemax + 1));
	}

	if (fp->ctf_ptrtab != NULL) {
		ctf_free(fp->ctf_ptrtab,
		    sizeof (ushort_t) * (fp->ctf_typemax + 1));
	}

	ctf_hash_destroy(&fp->ctf_structs);
	ctf_hash_destroy(&fp->ctf_unions);
	ctf_hash_destroy(&fp->ctf_enums);
	ctf_hash_destroy(&fp->ctf_names);

	ctf_free(fp, sizeof (ctf_file_t));
}

/*
 * Return the CTF handle for the parent CTF container, if one exists.
 * Otherwise return NULL to indicate this container has no imported parent.
 */
ctf_file_t *
ctf_parent_file(ctf_file_t *fp)
{
	return (fp->ctf_parent);
}

/*
 * Return the name of the parent CTF container, if one exists.  Otherwise
 * return NULL to indicate this container is a root container.
 */
const char *
ctf_parent_name(ctf_file_t *fp)
{
	return (fp->ctf_parname);
}

/*
 * Import the types from the specified parent container by storing a pointer
 * to it in ctf_parent and incrementing its reference count.  Only one parent
 * is allowed: if a parent already exists, it is replaced by the new parent.
 */
int
ctf_import(ctf_file_t *fp, ctf_file_t *pfp)
{
	if (fp == NULL || fp == pfp || (pfp != NULL && pfp->ctf_refcnt == 0))
		return (ctf_set_errno(fp, EINVAL));

	if (pfp != NULL && pfp->ctf_dmodel != fp->ctf_dmodel)
		return (ctf_set_errno(fp, ECTF_DMODEL));

	if (fp->ctf_parent != NULL)
		ctf_close(fp->ctf_parent);

	if (pfp != NULL) {
		fp->ctf_flags |= LCTF_CHILD;
		pfp->ctf_refcnt++;
	}

	fp->ctf_parent = pfp;
	return (0);
}

/*
 * Set the data model constant for the CTF container.
 */
int
ctf_setmodel(ctf_file_t *fp, int model)
{
	const ctf_dmodel_t *dp;

	for (dp = _libctf_models; dp->ctd_name != NULL; dp++) {
		if (dp->ctd_code == model) {
			fp->ctf_dmodel = dp;
			return (0);
		}
	}

	return (ctf_set_errno(fp, EINVAL));
}

/*
 * Return the data model constant for the CTF container.
 */
int
ctf_getmodel(ctf_file_t *fp)
{
	return (fp->ctf_dmodel->ctd_code);
}

void
ctf_setspecific(ctf_file_t *fp, void *data)
{
	fp->ctf_specific = data;
}

void *
ctf_getspecific(ctf_file_t *fp)
{
	return (fp->ctf_specific);
}