summaryrefslogtreecommitdiff
path: root/tools/fdtgrep.c
blob: 2a8058f57fa4e13ebe99aa82b77e1b411ebffda4 (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
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2013, Google Inc.
 * Written by Simon Glass <sjg@chromium.org>
 *
 * Perform a grep of an FDT either displaying the source subset or producing
 * a new .dtb subset which can be used as required.
 */

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "fdt_host.h"
#include "libfdt_internal.h"

/* Define DEBUG to get some debugging output on stderr */
#ifdef DEBUG
#define debug(a, b...) fprintf(stderr, a, ## b)
#else
#define debug(a, b...)
#endif

/* A linked list of values we are grepping for */
struct value_node {
	int type;		/* Types this value matches (FDT_IS... mask) */
	int include;		/* 1 to include matches, 0 to exclude */
	const char *string;	/* String to match */
	struct value_node *next;	/* Pointer to next node, or NULL */
};

/* Output formats we support */
enum output_t {
	OUT_DTS,		/* Device tree source */
	OUT_DTB,		/* Valid device tree binary */
	OUT_BIN,		/* Fragment of .dtb, for hashing */
};

/* Holds information which controls our output and options */
struct display_info {
	enum output_t output;	/* Output format */
	int add_aliases;	/* Add aliases node to output */
	int all;		/* Display all properties/nodes */
	int colour;		/* Display output in ANSI colour */
	int region_list;	/* Output a region list */
	int flags;		/* Flags (FDT_REG_...) */
	int list_strings;	/* List strings in string table */
	int show_offset;	/* Show offset */
	int show_addr;		/* Show address */
	int header;		/* Output an FDT header */
	int diff;		/* Show +/- diff markers */
	int include_root;	/* Include the root node and all properties */
	int remove_strings;	/* Remove unused strings */
	int show_dts_version;	/* Put '/dts-v1/;' on the first line */
	int types_inc;		/* Mask of types that we include (FDT_IS...) */
	int types_exc;		/* Mask of types that we exclude (FDT_IS...) */
	int invert;		/* Invert polarity of match */
	struct value_node *value_head;	/* List of values to match */
	const char *output_fname;	/* Output filename */
	FILE *fout;		/* File to write dts/dtb output */
};

static void report_error(const char *where, int err)
{
	fprintf(stderr, "Error at '%s': %s\n", where, fdt_strerror(err));
}

/* Supported ANSI colours */
enum {
	COL_BLACK,
	COL_RED,
	COL_GREEN,
	COL_YELLOW,
	COL_BLUE,
	COL_MAGENTA,
	COL_CYAN,
	COL_WHITE,

	COL_NONE = -1,
};

/**
 * print_ansi_colour() - Print out the ANSI sequence for a colour
 *
 * @fout:	Output file
 * @col:	Colour to output (COL_...), or COL_NONE to reset colour
 */
static void print_ansi_colour(FILE *fout, int col)
{
	if (col == COL_NONE)
		fprintf(fout, "\033[0m");
	else
		fprintf(fout, "\033[1;%dm", col + 30);
}


/**
 * value_add() - Add a new value to our list of things to grep for
 *
 * @disp:	Display structure, holding info about our options
 * @headp:	Pointer to header pointer of list
 * @type:	Type of this value (FDT_IS_...)
 * @include:	1 if we want to include matches, 0 to exclude
 * @str:	String value to match
 */
static int value_add(struct display_info *disp, struct value_node **headp,
		     int type, int include, const char *str)
{
	struct value_node *node;

	/*
	 * Keep track of which types we are excluding/including. We don't
	 * allow both including and excluding things, because it doesn't make
	 * sense. 'Including' means that everything not mentioned is
	 * excluded. 'Excluding' means that everything not mentioned is
	 * included. So using the two together would be meaningless.
	 */
	if (include)
		disp->types_inc |= type;
	else
		disp->types_exc |= type;
	if (disp->types_inc & disp->types_exc & type) {
		fprintf(stderr,
			"Cannot use both include and exclude for '%s'\n", str);
		return -1;
	}

	str = strdup(str);
	if (!str)
		goto err_mem;
	node = malloc(sizeof(*node));
	if (!node)
		goto err_mem;
	node->next = *headp;
	node->type = type;
	node->include = include;
	node->string = str;
	*headp = node;

	return 0;
err_mem:
	fprintf(stderr, "Out of memory\n");
	return -1;
}

static bool util_is_printable_string(const void *data, int len)
{
	const char *s = data;
	const char *ss, *se;

	/* zero length is not */
	if (len == 0)
		return 0;

	/* must terminate with zero */
	if (s[len - 1] != '\0')
		return 0;

	se = s + len;

	while (s < se) {
		ss = s;
		while (s < se && *s && isprint((unsigned char)*s))
			s++;

		/* not zero, or not done yet */
		if (*s != '\0' || s == ss)
			return 0;

		s++;
	}

	return 1;
}

static void utilfdt_print_data(const char *data, int len)
{
	int i;
	const char *p = data;
	const char *s;

	/* no data, don't print */
	if (len == 0)
		return;

	if (util_is_printable_string(data, len)) {
		printf(" = ");

		s = data;
		do {
			printf("\"%s\"", s);
			s += strlen(s) + 1;
			if (s < data + len)
				printf(", ");
		} while (s < data + len);

	} else if ((len % 4) == 0) {
		const uint32_t *cell = (const uint32_t *)data;

		printf(" = <");
		for (i = 0, len /= 4; i < len; i++)
			printf("0x%08x%s", fdt32_to_cpu(cell[i]),
			       i < (len - 1) ? " " : "");
		printf(">");
	} else {
		printf(" = [");
		for (i = 0; i < len; i++)
			printf("%02x%s", *p++, i < len - 1 ? " " : "");
		printf("]");
	}
}

/**
 * display_fdt_by_regions() - Display regions of an FDT source
 *
 * This dumps an FDT as source, but only certain regions of it. This is the
 * final stage of the grep - we have a list of regions we want to display,
 * and this function displays them.
 *
 * @disp:	Display structure, holding info about our options
 * @blob:	FDT blob to display
 * @region:	List of regions to display
 * @count:	Number of regions
 */
static int display_fdt_by_regions(struct display_info *disp, const void *blob,
		struct fdt_region region[], int count)
{
	struct fdt_region *reg = region, *reg_end = region + count;
	uint32_t off_mem_rsvmap = fdt_off_mem_rsvmap(blob);
	int base = fdt_off_dt_struct(blob);
	int version = fdt_version(blob);
	int offset, nextoffset;
	int tag, depth, shift;
	FILE *f = disp->fout;
	uint64_t addr, size;
	int in_region;
	int file_ofs;
	int i;

	if (disp->show_dts_version)
		fprintf(f, "/dts-v1/;\n");

	if (disp->header) {
		fprintf(f, "// magic:\t\t0x%x\n", fdt_magic(blob));
		fprintf(f, "// totalsize:\t\t0x%x (%d)\n", fdt_totalsize(blob),
			fdt_totalsize(blob));
		fprintf(f, "// off_dt_struct:\t0x%x\n",
			fdt_off_dt_struct(blob));
		fprintf(f, "// off_dt_strings:\t0x%x\n",
			fdt_off_dt_strings(blob));
		fprintf(f, "// off_mem_rsvmap:\t0x%x\n", off_mem_rsvmap);
		fprintf(f, "// version:\t\t%d\n", version);
		fprintf(f, "// last_comp_version:\t%d\n",
			fdt_last_comp_version(blob));
		if (version >= 2) {
			fprintf(f, "// boot_cpuid_phys:\t0x%x\n",
				fdt_boot_cpuid_phys(blob));
		}
		if (version >= 3) {
			fprintf(f, "// size_dt_strings:\t0x%x\n",
				fdt_size_dt_strings(blob));
		}
		if (version >= 17) {
			fprintf(f, "// size_dt_struct:\t0x%x\n",
				fdt_size_dt_struct(blob));
		}
		fprintf(f, "\n");
	}

	if (disp->flags & FDT_REG_ADD_MEM_RSVMAP) {
		const struct fdt_reserve_entry *p_rsvmap;

		p_rsvmap = (const struct fdt_reserve_entry *)
				((const char *)blob + off_mem_rsvmap);
		for (i = 0; ; i++) {
			addr = fdt64_to_cpu(p_rsvmap[i].address);
			size = fdt64_to_cpu(p_rsvmap[i].size);
			if (addr == 0 && size == 0)
				break;

			fprintf(f, "/memreserve/ %llx %llx;\n",
				(unsigned long long)addr,
				(unsigned long long)size);
		}
	}

	depth = 0;
	nextoffset = 0;
	shift = 4;	/* 4 spaces per indent */
	do {
		const struct fdt_property *prop;
		const char *name;
		int show;
		int len;

		offset = nextoffset;

		/*
		 * Work out the file offset of this offset, and decide
		 * whether it is in the region list or not
		 */
		file_ofs = base + offset;
		if (reg < reg_end && file_ofs >= reg->offset + reg->size)
			reg++;
		in_region = reg < reg_end && file_ofs >= reg->offset &&
				file_ofs < reg->offset + reg->size;
		tag = fdt_next_tag(blob, offset, &nextoffset);

		if (tag == FDT_END)
			break;
		show = in_region || disp->all;
		if (show && disp->diff)
			fprintf(f, "%c", in_region ? '+' : '-');

		if (!show) {
			/* Do this here to avoid 'if (show)' in every 'case' */
			if (tag == FDT_BEGIN_NODE)
				depth++;
			else if (tag == FDT_END_NODE)
				depth--;
			continue;
		}
		if (tag != FDT_END) {
			if (disp->show_addr)
				fprintf(f, "%4x: ", file_ofs);
			if (disp->show_offset)
				fprintf(f, "%4x: ", file_ofs - base);
		}

		/* Green means included, red means excluded */
		if (disp->colour)
			print_ansi_colour(f, in_region ? COL_GREEN : COL_RED);

		switch (tag) {
		case FDT_PROP:
			prop = fdt_get_property_by_offset(blob, offset, NULL);
			name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
			fprintf(f, "%*s%s", depth * shift, "", name);
			utilfdt_print_data(prop->data,
					   fdt32_to_cpu(prop->len));
			fprintf(f, ";");
			break;

		case FDT_NOP:
			fprintf(f, "%*s// [NOP]", depth * shift, "");
			break;

		case FDT_BEGIN_NODE:
			name = fdt_get_name(blob, offset, &len);
			fprintf(f, "%*s%s {", depth++ * shift, "",
				*name ? name : "/");
			break;

		case FDT_END_NODE:
			fprintf(f, "%*s};", --depth * shift, "");
			break;
		}

		/* Reset colour back to normal before end of line */
		if (disp->colour)
			print_ansi_colour(f, COL_NONE);
		fprintf(f, "\n");
	} while (1);

	/* Print a list of strings if requested */
	if (disp->list_strings) {
		const char *str;
		int str_base = fdt_off_dt_strings(blob);

		for (offset = 0; offset < fdt_size_dt_strings(blob);
				offset += strlen(str) + 1) {
			str = fdt_string(blob, offset);
			int len = strlen(str) + 1;
			int show;

			/* Only print strings that are in the region */
			file_ofs = str_base + offset;
			in_region = reg < reg_end &&
					file_ofs >= reg->offset &&
					file_ofs + len < reg->offset +
						reg->size;
			show = in_region || disp->all;
			if (show && disp->diff)
				printf("%c", in_region ? '+' : '-');
			if (disp->show_addr)
				printf("%4x: ", file_ofs);
			if (disp->show_offset)
				printf("%4x: ", offset);
			printf("%s\n", str);
		}
	}

	return 0;
}

/**
 * dump_fdt_regions() - Dump regions of an FDT as binary data
 *
 * This dumps an FDT as binary, but only certain regions of it. This is the
 * final stage of the grep - we have a list of regions we want to dump,
 * and this function dumps them.
 *
 * The output of this function may or may not be a valid FDT. To ensure it
 * is, these disp->flags must be set:
 *
 *   FDT_REG_SUPERNODES: ensures that subnodes are preceded by their
 *		parents. Without this option, fragments of subnode data may be
 *		output without the supernodes above them. This is useful for
 *		hashing but cannot produce a valid FDT.
 *   FDT_REG_ADD_STRING_TAB: Adds a string table to the end of the FDT.
 *		Without this none of the properties will have names
 *   FDT_REG_ADD_MEM_RSVMAP: Adds a mem_rsvmap table - an FDT is invalid
 *		without this.
 *
 * @disp:	Display structure, holding info about our options
 * @blob:	FDT blob to display
 * @region:	List of regions to display
 * @count:	Number of regions
 * @out:	Output destination
 */
static int dump_fdt_regions(struct display_info *disp, const void *blob,
		struct fdt_region region[], int count, char *out)
{
	struct fdt_header *fdt;
	int size, struct_start;
	int ptr;
	int i;

	/* Set up a basic header (even if we don't actually write it) */
	fdt = (struct fdt_header *)out;
	memset(fdt, '\0', sizeof(*fdt));
	fdt_set_magic(fdt, FDT_MAGIC);
	struct_start = FDT_ALIGN(sizeof(struct fdt_header),
					sizeof(struct fdt_reserve_entry));
	fdt_set_off_mem_rsvmap(fdt, struct_start);
	fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
	fdt_set_last_comp_version(fdt, FDT_FIRST_SUPPORTED_VERSION);

	/*
	 * Calculate the total size of the regions we are writing out. The
	 * first will be the mem_rsvmap if the FDT_REG_ADD_MEM_RSVMAP flag
	 * is set. The last will be the string table if FDT_REG_ADD_STRING_TAB
	 * is set.
	 */
	for (i = size = 0; i < count; i++)
		size += region[i].size;

	/* Bring in the mem_rsvmap section from the old file if requested */
	if (count > 0 && (disp->flags & FDT_REG_ADD_MEM_RSVMAP)) {
		struct_start += region[0].size;
		size -= region[0].size;
	}
	fdt_set_off_dt_struct(fdt, struct_start);

	/* Update the header to have the correct offsets/sizes */
	if (count >= 2 && (disp->flags & FDT_REG_ADD_STRING_TAB)) {
		int str_size;

		str_size = region[count - 1].size;
		fdt_set_size_dt_struct(fdt, size - str_size);
		fdt_set_off_dt_strings(fdt, struct_start + size - str_size);
		fdt_set_size_dt_strings(fdt, str_size);
		fdt_set_totalsize(fdt, struct_start + size);
	}

	/* Write the header if required */
	ptr = 0;
	if (disp->header) {
		ptr = sizeof(*fdt);
		while (ptr < fdt_off_mem_rsvmap(fdt))
			out[ptr++] = '\0';
	}

	/* Output all the nodes including any mem_rsvmap/string table */
	for (i = 0; i < count; i++) {
		struct fdt_region *reg = &region[i];

		memcpy(out + ptr, (const char *)blob + reg->offset, reg->size);
		ptr += reg->size;
	}

	return ptr;
}

/**
 * show_region_list() - Print out a list of regions
 *
 * The list includes the region offset (absolute offset from start of FDT
 * blob in bytes) and size
 *
 * @reg:	List of regions to print
 * @count:	Number of regions
 */
static void show_region_list(struct fdt_region *reg, int count)
{
	int i;

	printf("Regions: %d\n", count);
	for (i = 0; i < count; i++, reg++) {
		printf("%d:  %-10x  %-10x\n", i, reg->offset,
		       reg->offset + reg->size);
	}
}

static int check_type_include(void *priv, int type, const char *data, int size)
{
	struct display_info *disp = priv;
	struct value_node *val;
	int match, none_match = FDT_IS_ANY;

	/* If none of our conditions mention this type, we know nothing */
	debug("type=%x, data=%s\n", type, data ? data : "(null)");
	if (!((disp->types_inc | disp->types_exc) & type)) {
		debug("   - not in any condition\n");
		return -1;
	}

	/*
	 * Go through the list of conditions. For inclusive conditions, we
	 * return 1 at the first match. For exclusive conditions, we must
	 * check that there are no matches.
	 */
	if (data) {
		for (val = disp->value_head; val; val = val->next) {
			if (!(type & val->type))
				continue;
			match = fdt_stringlist_contains(data, size,
							val->string);
			debug("      - val->type=%x, str='%s', match=%d\n",
			      val->type, val->string, match);
			if (match && val->include) {
				debug("   - match inc %s\n", val->string);
				return 1;
			}
			if (match)
				none_match &= ~val->type;
		}
	}

	/*
	 * If this is an exclusive condition, and nothing matches, then we
	 * should return 1.
	 */
	if ((type & disp->types_exc) && (none_match & type)) {
		debug("   - match exc\n");
		/*
		 * Allow FDT_IS_COMPAT to make the final decision in the
		 * case where there is no specific type
		 */
		if (type == FDT_IS_NODE && disp->types_exc == FDT_ANY_GLOBAL) {
			debug("   - supressed exc node\n");
			return -1;
		}
		return 1;
	}

	/*
	 * Allow FDT_IS_COMPAT to make the final decision in the
	 * case where there is no specific type (inclusive)
	 */
	if (type == FDT_IS_NODE && disp->types_inc == FDT_ANY_GLOBAL)
		return -1;

	debug("   - no match, types_inc=%x, types_exc=%x, none_match=%x\n",
	      disp->types_inc, disp->types_exc, none_match);

	return 0;
}

/**
 * h_include() - Include handler function for fdt_find_regions()
 *
 * This function decides whether to include or exclude a node, property or
 * compatible string. The function is defined by fdt_find_regions().
 *
 * The algorithm is documented in the code - disp->invert is 0 for normal
 * operation, and 1 to invert the sense of all matches.
 *
 * See
 */
static int h_include(void *priv, const void *fdt, int offset, int type,
		     const char *data, int size)
{
	struct display_info *disp = priv;
	int inc, len;

	inc = check_type_include(priv, type, data, size);
	if (disp->include_root && type == FDT_IS_PROP && offset == 0 && inc)
		return 1;

	/*
	 * If the node name does not tell us anything, check the
	 * compatible string
	 */
	if (inc == -1 && type == FDT_IS_NODE) {
		debug("   - checking compatible2\n");
		data = fdt_getprop(fdt, offset, "compatible", &len);
		inc = check_type_include(priv, FDT_IS_COMPAT, data, len);
	}

	/* If we still have no idea, check for properties in the node */
	if (inc != 1 && type == FDT_IS_NODE &&
	    (disp->types_inc & FDT_NODE_HAS_PROP)) {
		debug("   - checking node '%s'\n",
		      fdt_get_name(fdt, offset, NULL));
		for (offset = fdt_first_property_offset(fdt, offset);
		     offset > 0 && inc != 1;
		     offset = fdt_next_property_offset(fdt, offset)) {
			const struct fdt_property *prop;
			const char *str;

			prop = fdt_get_property_by_offset(fdt, offset, NULL);
			if (!prop)
				continue;
			str = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
			inc = check_type_include(priv, FDT_NODE_HAS_PROP, str,
						 strlen(str));
		}
		if (inc == -1)
			inc = 0;
	}

	switch (inc) {
	case 1:
		inc = !disp->invert;
		break;
	case 0:
		inc = disp->invert;
		break;
	}
	debug("   - returning %d\n", inc);

	return inc;
}

static int h_cmp_region(const void *v1, const void *v2)
{
	const struct fdt_region *region1 = v1, *region2 = v2;

	return region1->offset - region2->offset;
}

static int fdtgrep_find_regions(const void *fdt,
		int (*include_func)(void *priv, const void *fdt, int offset,
				 int type, const char *data, int size),
		struct display_info *disp, struct fdt_region *region,
		int max_regions, char *path, int path_len, int flags)
{
	struct fdt_region_state state;
	int count;
	int ret;

	count = 0;
	ret = fdt_first_region(fdt, include_func, disp,
			&region[count++], path, path_len,
			disp->flags, &state);
	while (ret == 0) {
		ret = fdt_next_region(fdt, include_func, disp,
				count < max_regions ? &region[count] : NULL,
				path, path_len, disp->flags, &state);
		if (!ret)
			count++;
	}
	if (ret && ret != -FDT_ERR_NOTFOUND)
		return ret;

	/* Find all the aliases and add those regions back in */
	if (disp->add_aliases && count < max_regions) {
		int new_count;

		new_count = fdt_add_alias_regions(fdt, region, count,
						  max_regions, &state);
		if (new_count == -FDT_ERR_NOTFOUND) {
			/* No alias node found */
		} else if (new_count < 0) {
			return new_count;
		} else if (new_count <= max_regions) {
			/*
			* The alias regions will now be at the end of the list.
			* Sort the regions by offset to get things into the
			* right order
			*/
			count = new_count;
			qsort(region, count, sizeof(struct fdt_region),
			      h_cmp_region);
		}
	}

	return count;
}

int utilfdt_read_err_len(const char *filename, char **buffp, off_t *len)
{
	int fd = 0;	/* assume stdin */
	char *buf = NULL;
	off_t bufsize = 1024, offset = 0;
	int ret = 0;

	*buffp = NULL;
	if (strcmp(filename, "-") != 0) {
		fd = open(filename, O_RDONLY);
		if (fd < 0)
			return errno;
	}

	/* Loop until we have read everything */
	buf = malloc(bufsize);
	if (!buf)
		return -ENOMEM;
	do {
		/* Expand the buffer to hold the next chunk */
		if (offset == bufsize) {
			bufsize *= 2;
			buf = realloc(buf, bufsize);
			if (!buf)
				return -ENOMEM;
		}

		ret = read(fd, &buf[offset], bufsize - offset);
		if (ret < 0) {
			ret = errno;
			break;
		}
		offset += ret;
	} while (ret != 0);

	/* Clean up, including closing stdin; return errno on error */
	close(fd);
	if (ret)
		free(buf);
	else
		*buffp = buf;
	*len = bufsize;
	return ret;
}

int utilfdt_read_err(const char *filename, char **buffp)
{
	off_t len;
	return utilfdt_read_err_len(filename, buffp, &len);
}

char *utilfdt_read_len(const char *filename, off_t *len)
{
	char *buff;
	int ret = utilfdt_read_err_len(filename, &buff, len);

	if (ret) {
		fprintf(stderr, "Couldn't open blob from '%s': %s\n", filename,
			strerror(ret));
		return NULL;
	}
	/* Successful read */
	return buff;
}

char *utilfdt_read(const char *filename)
{
	off_t len;
	return utilfdt_read_len(filename, &len);
}

/**
 * Run the main fdtgrep operation, given a filename and valid arguments
 *
 * @param disp		Display information / options
 * @param filename	Filename of blob file
 * @param return 0 if ok, -ve on error
 */
static int do_fdtgrep(struct display_info *disp, const char *filename)
{
	struct fdt_region *region = NULL;
	int max_regions;
	int count = 100;
	char path[1024];
	char *blob;
	int i, ret;

	blob = utilfdt_read(filename);
	if (!blob)
		return -1;
	ret = fdt_check_header(blob);
	if (ret) {
		fprintf(stderr, "Error: %s\n", fdt_strerror(ret));
		return ret;
	}

	/* Allow old files, but they are untested */
	if (fdt_version(blob) < 17 && disp->value_head) {
		fprintf(stderr,
			"Warning: fdtgrep does not fully support version %d files\n",
			fdt_version(blob));
	}

	/*
	 * We do two passes, since we don't know how many regions we need.
	 * The first pass will count the regions, but if it is too many,
	 * we do another pass to actually record them.
	 */
	for (i = 0; i < 2; i++) {
		region = realloc(region, count * sizeof(struct fdt_region));
		if (!region) {
			fprintf(stderr, "Out of memory for %d regions\n",
				count);
			return -1;
		}
		max_regions = count;
		count = fdtgrep_find_regions(blob,
				h_include, disp,
				region, max_regions, path, sizeof(path),
				disp->flags);
		if (count < 0) {
			report_error("fdt_find_regions", count);
			free(region);
			return -1;
		}
		if (count <= max_regions)
			break;
	}
	if (count > max_regions) {
		free(region);
		fprintf(stderr, "Internal error with fdtgrep_find_region()\n");
		return -1;
	}

	/* Optionally print a list of regions */
	if (disp->region_list)
		show_region_list(region, count);

	/* Output either source .dts or binary .dtb */
	if (disp->output == OUT_DTS) {
		ret = display_fdt_by_regions(disp, blob, region, count);
	} else {
		void *fdt;
		/* Allow reserved memory section to expand slightly */
		int size = fdt_totalsize(blob) + 16;

		fdt = malloc(size);
		if (!fdt) {
			fprintf(stderr, "Out_of_memory\n");
			ret = -1;
			goto err;
		}
		size = dump_fdt_regions(disp, blob, region, count, fdt);
		if (disp->remove_strings) {
			void *out;

			out = malloc(size);
			if (!out) {
				fprintf(stderr, "Out_of_memory\n");
				ret = -1;
				goto err;
			}
			ret = fdt_remove_unused_strings(fdt, out);
			if (ret < 0) {
				fprintf(stderr,
					"Failed to remove unused strings: err=%d\n",
					ret);
				goto err;
			}
			free(fdt);
			fdt = out;
			ret = fdt_pack(fdt);
			if (ret < 0) {
				fprintf(stderr, "Failed to pack: err=%d\n",
					ret);
				goto err;
			}
			size = fdt_totalsize(fdt);
		}

		if (size != fwrite(fdt, 1, size, disp->fout)) {
			fprintf(stderr, "Write failure, %d bytes\n", size);
			free(fdt);
			ret = 1;
			goto err;
		}
		free(fdt);
	}
err:
	free(blob);
	free(region);

	return ret;
}

static const char usage_synopsis[] =
	"fdtgrep - extract portions from device tree\n"
	"\n"
	"Usage:\n"
	"	fdtgrep <options> <dt file>|-\n\n"
	"Output formats are:\n"
	"\tdts - device tree soure text\n"
	"\tdtb - device tree blob (sets -Hmt automatically)\n"
	"\tbin - device tree fragment (may not be a valid .dtb)";

/* Helper for usage_short_opts string constant */
#define USAGE_COMMON_SHORT_OPTS "hV"

/* Helper for aligning long_opts array */
#define a_argument required_argument

/* Helper for usage_long_opts option array */
#define USAGE_COMMON_LONG_OPTS \
	{"help",      no_argument, NULL, 'h'}, \
	{"version",   no_argument, NULL, 'V'}, \
	{NULL,        no_argument, NULL, 0x0}

/* Helper for usage_opts_help array */
#define USAGE_COMMON_OPTS_HELP \
	"Print this help and exit", \
	"Print version and exit", \
	NULL

/* Helper for getopt case statements */
#define case_USAGE_COMMON_FLAGS \
	case 'h': usage(NULL); \
	case 'V': util_version(); \
	case '?': usage("unknown option");

static const char usage_short_opts[] =
		"haAc:b:C:defg:G:HIlLmn:N:o:O:p:P:rRsStTv"
		USAGE_COMMON_SHORT_OPTS;
static struct option const usage_long_opts[] = {
	{"show-address",	no_argument, NULL, 'a'},
	{"colour",		no_argument, NULL, 'A'},
	{"include-node-with-prop", a_argument, NULL, 'b'},
	{"include-compat",	a_argument, NULL, 'c'},
	{"exclude-compat",	a_argument, NULL, 'C'},
	{"diff",		no_argument, NULL, 'd'},
	{"enter-node",		no_argument, NULL, 'e'},
	{"show-offset",		no_argument, NULL, 'f'},
	{"include-match",	a_argument, NULL, 'g'},
	{"exclude-match",	a_argument, NULL, 'G'},
	{"show-header",		no_argument, NULL, 'H'},
	{"show-version",	no_argument, NULL, 'I'},
	{"list-regions",	no_argument, NULL, 'l'},
	{"list-strings",	no_argument, NULL, 'L'},
	{"include-mem",		no_argument, NULL, 'm'},
	{"include-node",	a_argument, NULL, 'n'},
	{"exclude-node",	a_argument, NULL, 'N'},
	{"include-prop",	a_argument, NULL, 'p'},
	{"exclude-prop",	a_argument, NULL, 'P'},
	{"remove-strings",	no_argument, NULL, 'r'},
	{"include-root",	no_argument, NULL, 'R'},
	{"show-subnodes",	no_argument, NULL, 's'},
	{"skip-supernodes",	no_argument, NULL, 'S'},
	{"show-stringtab",	no_argument, NULL, 't'},
	{"show-aliases",	no_argument, NULL, 'T'},
	{"out",			a_argument, NULL, 'o'},
	{"out-format",		a_argument, NULL, 'O'},
	{"invert-match",	no_argument, NULL, 'v'},
	USAGE_COMMON_LONG_OPTS,
};
static const char * const usage_opts_help[] = {
	"Display address",
	"Show all nodes/tags, colour those that match",
	"Include contains containing property",
	"Compatible nodes to include in grep",
	"Compatible nodes to exclude in grep",
	"Diff: Mark matching nodes with +, others with -",
	"Enter direct subnode names of matching nodes",
	"Display offset",
	"Node/property/compatible string to include in grep",
	"Node/property/compatible string to exclude in grep",
	"Output a header",
	"Put \"/dts-v1/;\" on first line of dts output",
	"Output a region list",
	"List strings in string table",
	"Include mem_rsvmap section in binary output",
	"Node to include in grep",
	"Node to exclude in grep",
	"Property to include in grep",
	"Property to exclude in grep",
	"Remove unused strings from string table",
	"Include root node and all properties",
	"Show all subnodes matching nodes",
	"Don't include supernodes of matching nodes",
	"Include string table in binary output",
	"Include matching aliases in output",
	"-o <output file>",
	"-O <output format>",
	"Invert the sense of matching (select non-matching lines)",
	USAGE_COMMON_OPTS_HELP
};

/**
 * Call getopt_long() with standard options
 *
 * Since all util code runs getopt in the same way, provide a helper.
 */
#define util_getopt_long() getopt_long(argc, argv, usage_short_opts, \
				       usage_long_opts, NULL)

void util_usage(const char *errmsg, const char *synopsis,
		const char *short_opts, struct option const long_opts[],
		const char * const opts_help[])
{
	FILE *fp = errmsg ? stderr : stdout;
	const char a_arg[] = "<arg>";
	size_t a_arg_len = strlen(a_arg) + 1;
	size_t i;
	int optlen;

	fprintf(fp,
		"Usage: %s\n"
		"\n"
		"Options: -[%s]\n", synopsis, short_opts);

	/* prescan the --long opt length to auto-align */
	optlen = 0;
	for (i = 0; long_opts[i].name; ++i) {
		/* +1 is for space between --opt and help text */
		int l = strlen(long_opts[i].name) + 1;
		if (long_opts[i].has_arg == a_argument)
			l += a_arg_len;
		if (optlen < l)
			optlen = l;
	}

	for (i = 0; long_opts[i].name; ++i) {
		/* helps when adding new applets or options */
		assert(opts_help[i] != NULL);

		/* first output the short flag if it has one */
		if (long_opts[i].val > '~')
			fprintf(fp, "      ");
		else
			fprintf(fp, "  -%c, ", long_opts[i].val);

		/* then the long flag */
		if (long_opts[i].has_arg == no_argument) {
			fprintf(fp, "--%-*s", optlen, long_opts[i].name);
		} else {
			fprintf(fp, "--%s %s%*s", long_opts[i].name, a_arg,
				(int)(optlen - strlen(long_opts[i].name) -
				a_arg_len), "");
		}

		/* finally the help text */
		fprintf(fp, "%s\n", opts_help[i]);
	}

	if (errmsg) {
		fprintf(fp, "\nError: %s\n", errmsg);
		exit(EXIT_FAILURE);
	} else {
		exit(EXIT_SUCCESS);
	}
}

/**
 * Show usage and exit
 *
 * If you name all your usage variables with usage_xxx, then you can call this
 * help macro rather than expanding all arguments yourself.
 *
 * @param errmsg	If non-NULL, an error message to display
 */
#define usage(errmsg) \
	util_usage(errmsg, usage_synopsis, usage_short_opts, \
		   usage_long_opts, usage_opts_help)

void util_version(void)
{
	printf("Version: %s\n", "(U-Boot)");
	exit(0);
}

static void scan_args(struct display_info *disp, int argc, char *argv[])
{
	int opt;

	while ((opt = util_getopt_long()) != EOF) {
		int type = 0;
		int inc = 1;

		switch (opt) {
		case_USAGE_COMMON_FLAGS
		case 'a':
			disp->show_addr = 1;
			break;
		case 'A':
			disp->all = 1;
			break;
		case 'b':
			type = FDT_NODE_HAS_PROP;
			break;
		case 'C':
			inc = 0;
			/* no break */
		case 'c':
			type = FDT_IS_COMPAT;
			break;
		case 'd':
			disp->diff = 1;
			break;
		case 'e':
			disp->flags |= FDT_REG_DIRECT_SUBNODES;
			break;
		case 'f':
			disp->show_offset = 1;
			break;
		case 'G':
			inc = 0;
			/* no break */
		case 'g':
			type = FDT_ANY_GLOBAL;
			break;
		case 'H':
			disp->header = 1;
			break;
		case 'l':
			disp->region_list = 1;
			break;
		case 'L':
			disp->list_strings = 1;
			break;
		case 'm':
			disp->flags |= FDT_REG_ADD_MEM_RSVMAP;
			break;
		case 'N':
			inc = 0;
			/* no break */
		case 'n':
			type = FDT_IS_NODE;
			break;
		case 'o':
			disp->output_fname = optarg;
			break;
		case 'O':
			if (!strcmp(optarg, "dtb"))
				disp->output = OUT_DTB;
			else if (!strcmp(optarg, "dts"))
				disp->output = OUT_DTS;
			else if (!strcmp(optarg, "bin"))
				disp->output = OUT_BIN;
			else
				usage("Unknown output format");
			break;
		case 'P':
			inc = 0;
			/* no break */
		case 'p':
			type = FDT_IS_PROP;
			break;
		case 'r':
			disp->remove_strings = 1;
			break;
		case 'R':
			disp->include_root = 1;
			break;
		case 's':
			disp->flags |= FDT_REG_ALL_SUBNODES;
			break;
		case 'S':
			disp->flags &= ~FDT_REG_SUPERNODES;
			break;
		case 't':
			disp->flags |= FDT_REG_ADD_STRING_TAB;
			break;
		case 'T':
			disp->add_aliases = 1;
			break;
		case 'v':
			disp->invert = 1;
			break;
		case 'I':
			disp->show_dts_version = 1;
			break;
		}

		if (type && value_add(disp, &disp->value_head, type, inc,
				      optarg))
			usage("Cannot add value");
	}

	if (disp->invert && disp->types_exc)
		usage("-v has no meaning when used with 'exclude' conditions");
}

int main(int argc, char *argv[])
{
	char *filename = NULL;
	struct display_info disp;
	int ret;

	/* set defaults */
	memset(&disp, '\0', sizeof(disp));
	disp.flags = FDT_REG_SUPERNODES;	/* Default flags */

	scan_args(&disp, argc, argv);

	/* Show matched lines in colour if we can */
	disp.colour = disp.all && isatty(0);

	/* Any additional arguments can match anything, just like -g */
	while (optind < argc - 1) {
		if (value_add(&disp, &disp.value_head, FDT_IS_ANY, 1,
			      argv[optind++]))
			usage("Cannot add value");
	}

	if (optind < argc)
		filename = argv[optind++];
	if (!filename)
		usage("Missing filename");

	/* If a valid .dtb is required, set flags to ensure we get one */
	if (disp.output == OUT_DTB) {
		disp.header = 1;
		disp.flags |= FDT_REG_ADD_MEM_RSVMAP | FDT_REG_ADD_STRING_TAB;
	}

	if (disp.output_fname) {
		disp.fout = fopen(disp.output_fname, "w");
		if (!disp.fout)
			usage("Cannot open output file");
	} else {
		disp.fout = stdout;
	}

	/* Run the grep and output the results */
	ret = do_fdtgrep(&disp, filename);
	if (disp.output_fname)
		fclose(disp.fout);
	if (ret)
		return 1;

	return 0;
}